CN111013161B

CN111013161B - Children dump truck

Info

Publication number: CN111013161B
Application number: CN201911409213.9A
Authority: CN
Inventors: 朱铁文; 徐亚中; 丁宇
Original assignee: Goodbaby Child Products Co Ltd
Current assignee: Goodbaby Child Products Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2024-11-29
Anticipated expiration: 2039-12-31
Also published as: CN111013161A

Abstract

The invention relates to a children dump truck, which comprises a truck body, a dump box rotationally connected with the truck body, and a driving mechanism for driving the dump box to turn over relative to the truck body, wherein the driving mechanism comprises an operation piece, a transmission assembly for driving the dump box to rotate only when the operation piece slides in the forward direction, and a connecting rod assembly which is connected with the transmission assembly and drives the dump box to rotate. The invention can prevent potential safety hazard caused by misoperation of the tipping bucket box, improves safety, increases the overturning range of the tipping bucket box and enhances playability and interestingness.

Description

Children dump truck

Technical Field

The invention belongs to the field of children products, and particularly relates to a children dump truck.

Background

A child dump truck is a popular child toy that includes a body and a dump box that is capable of being flipped relative to the body. Most of the existing children dump trucks adopt a hydraulic mechanism to drive and realize the overturning of the dump box, and the driving mode has the defects of lower operation safety and higher cost. Thus, some child dump trucks have emerged that drive the dump box through mechanical structures.

For example, the scheme disclosed in patent application number 201720428324.4 and titled "a toy dump truck" includes a straight rack and a connecting rod, which are arranged on the body, two ends of the connecting rod are respectively hinged with the straight rack and the dump box, so that the connecting rod is driven to rotate by translation of the straight rack, and the dump box is lifted, and the movement of the straight rack is realized by driving a plurality of gears by a rocking handle.

The dump truck with the structural form is simpler in structure and easy to realize, but the dump truck directly drives the dump truck to lift through the shaking handle, the gear set and the rack, namely, different movements of the lift of the dump truck are realized through the same operation assembly, the dump truck can be driven to move no matter how the shaking handle is rotated, certain potential safety hazards exist, and especially when the dump truck ascends, the dump truck descends once being misoperation, and children are easy to be accidentally injured. Meanwhile, the lifting height of the tipping bucket is limited by the connecting rod, the tipping bucket can only lift within a limited range from the horizontal state to the vertical state of the connecting rod, and the reversing angle of the tipping bucket is limited.

Disclosure of Invention

The invention aims to provide the children dump truck which has higher safety and lower cost and can realize the large-scale overturning of the dump box.

In order to achieve the above purpose, the invention adopts the following technical scheme:

The utility model provides a children's tip truck, includes the automobile body, with the automobile body rotates to be connected and can be relative the tip truck box of automobile body upset, be used for the drive tip truck box is relative the actuating mechanism of automobile body upset, actuating mechanism including set up in the operating piece on the automobile body, only be used for driving when operating piece slides along forward tip truck box pivoted drive assembly and with drive assembly connects and drive tip truck box pivoted link assembly, link assembly includes first connecting rod, second connecting rod and haulage cable, first connecting rod with second connecting rod constructs the relative slip setting, first connecting rod with drive assembly is connected, the second connecting rod with tip truck box rotates to be connected, the haulage cable is used for connecting drive assembly with first connecting rod with second connecting rod, when operating piece slides forward, through drive assembly and haulage cable drives the second connecting rod is relative first connecting rod slides and makes tip truck box relative forward rotation certain angle.

Preferably, the transmission assembly includes a first gear and a second gear, the first gear and the second gear are engaged with each other when the operating member slides in a forward direction, and the engagement of the first gear and the second gear is disengaged from each other when the operating member slides in a reverse direction.

Preferably, the operating member has teeth thereon which intermesh with the first gear, the first gear being slidably and rotatably mounted on the vehicle body, and the second gear being rotatably mounted on the vehicle body.

Preferably, the transmission assembly further comprises a limiting tooth arranged on the end face of the second gear, a unidirectional ratchet wheel matched with and separated from the limiting tooth, and an unlocking assembly used for operating the unidirectional ratchet wheel to be matched with and separated from the limiting tooth, when the unidirectional ratchet wheel is separated from the limiting tooth on the second gear through the unlocking assembly, the dump box reversely rotates relative to the vehicle body to enable the second connecting rod to slide relative to the first connecting rod, and the second gear is driven to reversely rotate through the traction rope, and when the unidirectional ratchet wheel is matched with the limiting tooth of the second gear through the unlocking assembly, the dump box can only positively rotate.

Preferably, the unlocking assembly comprises an unlocking button which is correspondingly contacted with the unidirectional ratchet wheel and can move, and an elastic piece which is axially arranged along the second gear, and the elastic piece is arranged between the vehicle body and the unidirectional ratchet wheel.

Preferably, a through hole is formed in one side, facing the skip box, of the vehicle body, a connecting piece extending to the outside of the vehicle body through the through hole is rotatably connected to the second gear, and the first connecting rod is fixedly connected with the connecting piece.

Preferably, the traction cable comprises a first traction cable for converting forward rotation of the second gear and extending and sliding of the second connecting rod relative to the first connecting rod, and a second traction cable for converting reverse rotation of the second gear and retracting and sliding of the second connecting rod relative to the first connecting rod.

Preferably, a pin is fixedly arranged on the first connecting rod, a chute is formed in the second connecting rod along the sliding direction of the second connecting rod, and the pin is arranged in the chute in a sliding manner;

One end of the first traction rope is connected with the second gear, the first traction rope bypasses part of the circumference of the second gear and extends into the first connecting rod and the second connecting rod, and after bypassing the pin, the other end of the first traction rope is connected with the second connecting rod;

one end of the second traction rope is connected with the second gear, the second traction rope bypasses the other part of the circumference of the second gear and extends into the first connecting rod, and the other end of the second traction rope is connected with the second connecting rod.

Preferably, the vehicle body is provided with a limit column for limiting the sliding range of the operating part, the operating part is provided with a limit groove, and the limit column is slidably arranged in the limit groove.

The children's dump truck comprises a truck body, a dump box which is rotationally connected with the truck body and can turn over relative to the truck body, and a driving mechanism for driving the dump box to turn over relative to the truck body, wherein the driving mechanism comprises an operation piece arranged on the truck body, a transmission assembly which is driven by the operation piece and a connecting rod assembly which is connected with the transmission assembly and drives the dump box to rotate, the operation piece has a forward sliding direction and a reverse sliding direction opposite to the forward sliding direction, when the operation piece slides in the forward direction, the operation piece, the transmission assembly and the connecting rod assembly mutually move in a matched mode and drive the dump box to rotate in the forward direction relative to the truck body by a certain angle, when the operation piece slides in the reverse direction, the operation piece, the transmission assembly and the connecting rod assembly are matched or matched and separated, and the dump box is fixed relative to the truck body.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. The invention adopts the transmission component which only outputs positive rotation to drive the tipping bucket box to rotate when the operation piece slides along the positive direction, thereby preventing potential safety hazards caused by misoperation of the tipping bucket box and improving the safety;

2. because the invention adopts the driving connecting rod which is obliquely arranged to directly push the tipping bucket box to rotate, the tipping range of the tipping bucket box can be enlarged, and the playability and the interestingness of the tipping bucket box are enhanced.

Drawings

Fig. 1 is a schematic view of a children's dump truck of the present invention in an initial state.

Fig. 2 is a schematic view of the child dump truck of the present invention in a flipped state.

Fig. 3 is a schematic front view of a part of the transmission assembly of the children's dump truck according to the invention.

Figure 4 is a schematic A-A cross-sectional view of a part of the transmission assembly of the children's dump truck of the present invention.

Fig. 5 is a schematic diagram of the working principle of the operating member, the transmission assembly, the driving link and the traction rope in the children's dump truck of the present invention.

Fig. 6 is a schematic view of the connection piece in the children's dump truck of the present invention.

Fig. 7 is a schematic perspective view of a second gear in the children's dump truck of the present invention.

Fig. 8 is a schematic front view of a second gear in the children's dump truck of the present invention.

Fig. 9 is a schematic C-C sectional view of a second gear in the children's dump truck of the present invention.

Fig. 10 is a perspective view of a unidirectional ratchet wheel in the children's dump truck of the present invention.

Fig. 11 is a schematic view partly in section of a child dump truck according to another embodiment.

In the drawings, 1, a vehicle body, 2, a first gear, 3, an operating part, 4, a first connecting rod, 5, a sleeve, 6, a pin, 7, a second connecting rod, 8, a skip box, 9, a wheel axle turning point, 10, a connecting piece, 11, a second gear, 12, a one-way ratchet, 13, an unlocking button, 14, a first traction rope, 15, a second traction rope, 16, a chassis, 17, wheels, 18, a limit column, 19, a limit groove, 20, a chute, 21, a connecting column, 22, limit teeth, 23, a gear chute, 24, a handle, 25, a guide piece, 26 and a gear.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings.

The first embodiment of the invention relates to a children dump truck, which comprises a truck body, a dump box which is rotationally connected with the truck body and can turn over relative to the truck body, and a driving mechanism for driving the dump box to turn over relative to the truck body, wherein the driving mechanism comprises an operation piece arranged on the truck body, a transmission assembly which is driven by the operation piece, and a connecting rod assembly which is connected with the transmission assembly and drives the dump box to rotate, the operation piece has a forward sliding direction and a reverse sliding direction opposite to the forward sliding direction, when the operation piece slides along the forward direction, the operation piece, the transmission assembly and the connecting rod assembly move in a matched mode and drive the dump box to rotate a certain angle relative to the truck body, and when the operation piece slides along the reverse direction, the operation piece, the transmission assembly and the connecting rod assembly are matched or are separated in a matched mode, and the dump box is fixed relative to the truck body.

The specific scheme is shown in fig. 1 and 2, and the children dump truck comprises a truck body 1, a dump box 8 and a driving mechanism.

The bottom of the body 1 has a chassis 16 extending substantially horizontally, and the dump box 8 is rotatably connected to the body 1 so as to be capable of being turned over relative to the body 1. In this embodiment, the dump box 8 is rotatably connected to one end of the chassis 16, and wheels 17 are further mounted at the rotational connection shaft of the dump box 8 and the vehicle body 1, that is, the wheels 17 rotate relative to the chassis 16 of the vehicle body 1 through the rotating shaft 9, and at the same time, the dump box 8 rotates relative to the vehicle body 1 through the rotating shaft 9.

The driving mechanism is used for driving the tipping bucket box 8 to turn over relative to the vehicle body 1. The driving mechanism comprises an operation piece 3, a transmission component and a connecting rod component which is connected with the transmission component and drives the tipping bucket box 8 to rotate. The link assembly comprises a first link 4, a second link 7 and a traction cable. The operating member 3 is slidably disposed on the vehicle body 1, in this embodiment, the sliding direction of the operating member 3 is a vertical direction, which can slide vertically upwards or vertically downwards, the lower end of the operating member 3 is located in the vehicle body 1, and the upper end of the operating member 3 is exposed out of the vehicle body 1. The vehicle body 1 is provided with a limit post 18 for limiting the sliding range of the operating member 3, the operating member 3 is provided with a limit groove 19, and the limit post 18 is slidably arranged in the limit groove 19, so that the sliding range of the operating member 3 is limited by the cooperation of the limit post 18 and the limit groove 19. The two sliding directions of the operating member 3 are opposite, and here the vertically downward sliding operating member 3 is defined as sliding the operating member 3 in the forward direction, and the vertically upward sliding operating member 3 is defined as sliding the operating member 3 in the reverse direction.

The transmission unit is configured to output a forward rotation motion for driving the hoist box 8 to rotate only when the operation member 3 is slid in the forward direction, that is, to output a forward rotation motion which can drive the hoist box 8 to rotate upward when the operation member 3 is slid in the forward direction, and to output a rotation motion which is not outputted when the operation member 3 is slid in the reverse direction, and to drive the transmission unit to rotate in the reverse direction by the rotation of the hoist box 8 when the operation member 3 is not slid.

As shown in fig. 1 to 10, the transmission assembly includes a first gear 2 and a second gear 11. Wherein the diameter of the first gear wheel 2 is smaller than the diameter of the second gear wheel 11. The rotating shaft of the first gear 2 is slidably disposed on the vehicle body 1 along the sliding direction of the operating member 3, in this embodiment, a gear chute 23 extending along the up-down direction is disposed on the vehicle body 1, the rotating shaft of the first gear 2 is disposed in the gear chute 23, and the first gear 2 can not only rotate relative to the vehicle body 1, but also vertically slide relative to the vehicle body 1 through the up-down sliding of the rotating shaft relative to the gear chute 23. The operating member 3 is provided with a rack that meshes with the first gear 2, and when the operating member 3 is slid, the first gear 2 can be driven to slide and rotate by the cooperation of the gear and the rack. The second gear 11 is rotatably mounted on the vehicle body 1 and is capable of meshing with the first gear 2, i.e. both mesh when the first gear 2 slides close to the second gear 11 and are disengaged when the first gear 2 slides away from the second gear 11. When the operating member 3 slides in the forward direction, the first gear 2 and the second gear 11 are engaged with each other, and when the operating member 3 slides in the reverse direction, the engagement of the first gear 2 and the second gear 11 is disengaged from each other.

The transmission assembly further comprises a limiting tooth 22 arranged on the end face of the second gear 11, a unidirectional ratchet 12 which is matched with and separated from the limiting tooth 22, and an unlocking assembly for operating the unidirectional ratchet 12 to be matched with and separated from the limiting tooth 33. When the unidirectional ratchet wheel 12 is separated from the limit teeth 22 on the second gear 11 through the unlocking component, the skip box 8 rotates reversely relative to the vehicle body 1 to enable the second connecting rod 7 to slide relative to the first connecting rod 4 and drive the second gear 11 to rotate reversely through the traction rope, and when the unidirectional ratchet wheel 12 is matched with the limit teeth 22 of the second gear 11 through the unlocking component, the skip box 8 can only rotate forwardly.

A coaxial recess may be provided in the end face of the second gear 11 and the spacing teeth 22 may be provided on the bottom surface within the recess. The one-way ratchet 12 is mounted on the body 1 and is capable of engaging with the limit teeth 22 on the second gear 11 to limit rotation of the second gear 11 when the operating member 3 is slid in the reverse direction. The one-way ratchet 12 may be disposed in a groove on the end face of the second gear 11 and may be movable in the axial direction of the second gear 11. The unlocking component is connected with the unidirectional ratchet 12 and is used for driving the unidirectional ratchet 12 to be meshed with or separated from the limiting teeth 22 on the second gear 11. In this embodiment, the unlocking assembly includes an unlocking button 13 and an elastic member, where the unlocking button 13 is disposed in corresponding contact with the unidirectional ratchet 12 and is capable of moving, and the second gear 11 may be coaxially sleeved on the outer periphery of the unlocking button 13. The elastic member is axially provided along the second gear 11, and the elastic member is provided between the vehicle body 1 and the one-way ratchet 12. Thus, when the unlocking button 13 is pressed, the unidirectional ratchet 12 can be separated from the limit teeth 22 of the second gear 11, and when the unlocking button 13 is released, the elastic piece can reset the unidirectional ratchet 12 to be in mesh with the limit teeth 22 of the second gear 11. The elastic member may employ a spring. Since the first gear 2 and the second gear 11 are mainly provided in the vehicle body 1, the vehicle body 1 may also be referred to as a gear box.

The second connecting rod 7 is coaxially and relatively connected with the first connecting rod 4 in a sliding manner, the second connecting rod and the first connecting rod form a driving connecting rod which is obliquely arranged, and the first connecting rod 4 is arranged on one side close to the vehicle body 1 and is connected with a transmission assembly. In this embodiment, a through hole is formed in the vehicle body 1 on a side facing the dump box 8, a connecting piece 10 extending to the outside of the vehicle body 1 through the through hole is rotatably connected to the second gear 11, and the first connecting rod 4 is fixedly connected to the connecting piece 10. The second connecting rod 7 is arranged at one side close to the skip box 8, and the end part of the second connecting rod 7 is rotationally connected with the skip box 8. The second link 7 is extended or retracted with respect to the first link 4, and the driving link is lengthened or shortened, thereby pushing the dump box 8 to rotate with respect to the vehicle body 1.

The traction cable is used for connecting the transmission assembly with the first connecting rod 4 and the second connecting rod 7 and is used for realizing conversion between rotation of the transmission assembly and sliding of the second connecting rod 7. The traction rope comprises a first traction rope 14 and a second traction rope 15, wherein the first traction rope 14 is used for converting forward rotation of the second gear 11 and extending and sliding of the second connecting rod 7 relative to the first connecting rod 4, and the second traction rope 15 is used for converting reverse rotation of the second gear 11 and retracting and sliding of the second connecting rod 7 relative to the first connecting rod 4. Specifically, the first connecting rod 4 is fixedly provided with a pin 6, the second connecting rod 7 is provided with a chute 20 along the sliding direction, and the pin 6 is slidably arranged in the chute 20. A sleeve 5 may be provided on the first link 4 and a pin 6 may be provided on the sleeve 5. The first traction cable 14 is fixed at one end to the second gear 11 and extends into the first link 4 and the second link 7 around part of the circumference of the second gear 11, and is then fixed to one of the connecting posts 21 of the second link 7 around the pin 6. The second traction cable 15 is fixed at one end to the second gear wheel 11, extends around the other part of the circumference of the second gear wheel 11 into the first link 4, and is finally fixed to the other connecting post 21 of the second link 7.

The child dump truck has an initial state as shown in fig. 1 and a flipped state in which the dump box 8 is flipped to a maximum angle as shown in fig. 2, and is capable of being switched between these two states.

In the initial state, the skip box 8 is not turned over relative to the vehicle body 1, is in a close state with the vehicle body 1, and the unidirectional ratchet 12 is meshed with the limiting teeth 22 on the second gear 11. When the operating member 3 is operated to slide forward, the second connecting rod 7 is driven to slide relative to the first connecting rod 4 through the transmission assembly and the traction rope to enable the skip box 8 to rotate forward by a certain angle relative to the vehicle body 1, specifically, when the operating member 3 is pulled upwards, the operating member 3 slides in the vehicle body 1, meanwhile, the first gear 2 slides upwards along with the operating member 3, so that the first gear 2 is separated from the second gear 11, and the second gear 11 cannot move along with the operating member 3 and the first gear 2. When the operating member 3 is moved to the highest point, the operating member 3 is pressed down so that the first gear 2 also slides downward. When the first gear 2 is engaged with the second gear 11, the second gear 11 will rotate forward (i.e. rotate clockwise in fig. 1 in this embodiment) under the action of the operating member 3 and the first gear 2. When the second gear 11 rotates positively, the second connecting rod 7 is driven to extend out and move upwards relative to the first connecting rod 4 through the action of the two traction ropes, so that the tipping bucket box 8 is jacked up, namely, when the second gear 11 rotates positively, the part of the first traction rope 14 wound on the second gear 11 is increased, so that the part of the first traction rope 14 between the first connecting rod 4 and the second connecting rod 7, which is wound on the pin 6 and is arranged on the connecting column 21, is shortened, the second connecting rod 7 is pulled to move so as to extend out relative to the first connecting rod 4, meanwhile, the part of the second traction rope 15 wound on the second gear 11 is shortened, and along with the extension of the second connecting rod 7, the part of the second traction rope 15 in the first connecting rod 4 is increased. When the operation member 3 moves to the lowest point, the above-described actions of pulling and pressing down the operation member 3 are repeated. Because the unidirectional ratchet wheel 12 is arranged in the second gear 11, when the two gears are meshed, the second gear 11 can only rotate in the forward direction (clockwise direction) and can not rotate in the reverse direction (anticlockwise direction). Therefore, when the operating member 3 is pulled up, the second gear 11 does not rotate, and the second link 7 and the dump box 8 remain unchanged. After repeated pulling of the operating member 3 several times, the skip box 8 will move to the highest point, as shown in fig. 2.

When the one-way ratchet wheel 12 is separated from the limiting teeth on the second gear 11 through the unlocking component, the skip box 8 reversely rotates relative to the vehicle body 1, so that the second connecting rod 7 slides relative to the first connecting rod 4, and the second gear 11 is driven to reversely rotate through the traction rope. Specifically, when the skip box is in the highest state relative to the car body, the unlocking button 13 is pressed, the unlocking button 13 pushes to enable the unidirectional ratchet 12 and the second gear 11 to be separated, at the moment, the skip box 8 reversely rotates downwards under the action of gravity to drive the second connecting rod 7 to retract relative to the first connecting rod 4 to move downwards, so that the second gear 11 is reversely rotated under the action of the traction rope, and finally the initial state shown in the figure 1 is returned.

According to the child dump truck, the overturning of the dump box 8 is achieved through the pure mechanical structure, on one hand, the overturning angle of the dump box 8 can be set larger according to needs, on the other hand, the child dump truck can achieve two-direction rotation of the dump box 8 through different operations, and damage to children caused by misoperation can be avoided.

In the solution of the above embodiment, when the operating member 3 slides reversely, the operating member 3 cannot drive the second gear 11 and the link assembly of the transmission assembly to move through the internal matched disengagement of the transmission assembly, i.e. the engagement between the first gear 2 and the second gear 11, so that the skip box 8 is fixed relative to the vehicle body 1. In some embodiments, the purpose of fixing the dump box 8 relative to the vehicle body 1 can also be achieved by disengaging any one of the operating member 3, the transmission assembly and the connecting rod assembly. For example, during the reverse movement of the operating element 3, the movement track is slightly adjusted to disengage from the first gear 1, so that the engagement and disengagement between the operating element 3 and the transmission assembly is realized, and the dump box 8 is immobilized with respect to the vehicle body 1 at this time. As shown in fig. 11, for example, the operating member 3 includes a grip 24 and a guide member 25 movably provided on the grip 24. The transmission assembly includes a gear 26 or the like. The grip 24 can be rotated in either the forward or reverse direction (in the direction perpendicular to the plane of the drawing). The guide 25 is provided along a radial direction of the gear 26 and is capable of reciprocating, the gear 26 is provided with one-way ratchet teeth, and the guide 25 is capable of being engaged with or disengaged from the one-way ratchet teeth. When the handle 24 is rotated in the forward direction, the guide 25 is driven to rotate synchronously, and at this time, the guide 25 is meshed with the unidirectional ratchet, so that the gear 26 is driven to rotate synchronously in the forward direction. When the handle 24 is rotated reversely, the guiding element 25 is pushed to move along the radial direction of the gear 26 under the action of the inclined surface of the unidirectional ratchet, so that the guiding element 25 is separated from the unidirectional ratchet, and the gear 26 cannot be driven to rotate reversely at the moment. In this solution, too, the skip box 8 is kept stationary by the disengagement of the coupling between the operating element 3 and the transmission assembly.

The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.

Claims

1. The children's dump truck comprises a truck body, a dump box which is rotationally connected with the truck body and can be turned relative to the truck body, and a driving mechanism for driving the dump box to turn relative to the truck body, and is characterized in that the driving mechanism comprises an operating piece arranged on the truck body, a transmission assembly which is only used for driving the dump box to rotate when the operating piece slides in the forward direction, and a connecting rod assembly which is connected with the transmission assembly and drives the dump box to rotate, wherein the connecting rod assembly comprises a first connecting rod, a second connecting rod and a traction rope, the first connecting rod and the second connecting rod are arranged in a sliding manner relatively, the first connecting rod is connected with the transmission assembly, the second connecting rod is rotationally connected with the dump box, and the traction rope is used for connecting the transmission assembly with the first connecting rod and the second connecting rod, and drives the dump box to rotate relative to the first connecting rod through the transmission assembly and the traction rope when the operating piece slides in the forward direction, so that the dump box rotates relative to a certain angle;

The transmission assembly comprises a first gear and a second gear, when the operation piece slides forwards, the first gear is meshed with the second gear, when the operation piece slides backwards, the first gear is meshed with the second gear, the meshing of the first gear and the second gear is separated from each other, the transmission assembly further comprises a limit tooth arranged on the end face of the second gear, a one-way ratchet wheel matched with and separated from the limit tooth, and an unlocking assembly used for operating the one-way ratchet wheel to be matched with and separated from the limit tooth, when the unlocking assembly is used for separating the one-way ratchet wheel from the limit tooth on the second gear, the second connecting rod slides relative to the first connecting rod through reverse rotation of the skip box relative to the car body, and the second gear is driven to rotate reversely through the traction rope, when the one-way ratchet wheel is matched with the limit tooth of the second gear through the unlocking assembly, the skip box can only rotate forwards, and the unlocking assembly comprises a button which is arranged in corresponding contact with the one-way ratchet wheel and can move, an elastic piece is arranged between the second ratchet wheel and the one-way ratchet wheel in the axial direction.

2. A children's dump truck according to claim 1, wherein the operating member has teeth thereon which intermesh with the first gear, the first gear being slidingly and rotatably mounted on the body, and the second gear being rotatably mounted on the body.

3. A children's dump truck according to claim 1, wherein a through hole is formed in one side of the truck body, which faces the dump box, and a connecting piece which penetrates through the through hole and extends out of the truck body is rotatably connected to the second gear, and the first connecting rod is fixedly connected with the connecting piece.

4. A children's dump truck according to claim 1, wherein the traction cable comprises a first traction cable for converting forward rotation of the second gear and extending and sliding of the second link relative to the first link, and a second traction cable for converting reverse rotation of the second gear and retracting and sliding of the second link relative to the first link.

5. The children's dump truck of claim 4, wherein the first connecting rod is fixedly provided with a pin, the second connecting rod is provided with a chute along the sliding direction, and the pin is arranged in the chute in a sliding way;

6. The children's dump truck of claim 1, wherein the vehicle body is provided with a limiting column for limiting the sliding range of the operating piece, the operating piece is provided with a limiting groove, and the limiting column is arranged in the limiting groove in a sliding mode.