CN110395645B - Folding Telescopic Maintenance Lift - Google Patents

Abstract

The invention provides a foldable telescopic maintenance elevator, which includes a car, a small guide rail mounting frame, a large guide rail, a guide wheel device and an anti-fall device. The car is installed on the small guide rail installation frame through the guide wheel device, and the small guide rail is installed on the small guide rail. The frame is installed in the large guide rail through the guide wheel device, the large guide rail is fixed on the equipment to be repaired, and the anti-fall device is installed on both sides of the car floor and the two sides of the small guide rail mounting frame respectively. The car includes a retractable door, a back panel, a bottom panel, a first side wall, a second side wall, a telescopic pole switch and a retractable door switch. The back panel is hinged to the first side wall, the second side wall and the bottom panel, and the bottom panel is respectively It is hinged with the first side wall, the second side wall and the retractable door, and the retractable door is connected with the side wall through the door panel pin shaft. The joints of the car of the present invention are connected by hinges, so the car can be folded when not in use, saving space, and the car is composed of connecting rods, which is convenient for disassembly, assembly and transportation, and has good structural stability. .

Description

Folding Telescopic Maintenance Lift

technical field

The invention relates to the technical field of maintenance elevators, in particular to a folding telescopic maintenance elevator.

Background technique

With the development of science and technology, aerial work equipment has gradually appeared. When the aerial work equipment has a technical failure, the cost of dismantling and maintenance is high, which requires a maintenance elevator to transport the maintenance personnel to the maintenance location safely and reliably. .

The traditional maintenance elevator will occupy most of the space during transportation because the car is too large, which increases the transportation cost and difficulty. At the same time, in the actual working situation, the traditional maintenance elevator cannot use a guide rail to guide the car due to the change of the height difference during the lifting process, so that the car cannot be lowered to the vicinity of the basic escalator line, which increases the maintenance personnel's upper limit. Therefore, it is necessary to design a square maintenance lift that is foldable and retractable and reduces the difficulty for maintenance personnel to get on the ladder.

SUMMARY OF THE INVENTION

In view of the urgent problems that need to be solved in the above traditional maintenance elevators, the present invention provides a foldable telescopic maintenance elevator, which is mainly to solve the difficulty of guiding the traditional maintenance elevators, and the car cannot be accurately parked near the stair line, so the maintenance personnel can cause inconvenience.

The invention provides a foldable telescopic maintenance elevator, which includes a car, a small guide rail mounting frame, a large guide rail, a guide wheel device and a fall prevention device, and the car is installed on the small guide rail through the guide wheel device. The small guide rail mounting frame is installed in the large guide rail through the guide wheel device, and the large guide rail is fixed on the equipment to be repaired. The shape of the car is square, including a retractable door, a back panel, a bottom panel, a first side wall, a second side wall, a telescopic rod switch and a retractable door switch, the first end of the back panel and the One side wall is connected by hinges, the second end of the back panel and the second side wall are connected by hinges, the bottom of the back panel and the first side of the bottom panel are connected by hinges, the second side of the bottom panel is connected by hinges The brackets are evenly installed on the third side, the second side and the third side of the bottom plate are connected with the side wall through the brackets, and the fourth side of the bottom plate and the folding door are connected by hinges, so The retractable door is connected with the side wall through a door panel pin shaft. The retractable door includes a door panel pin shaft, a door fixing pin mounting plate, a door panel mounting frame, a door pin and a stretching frame, and the back panel includes the platform mounting frame, the anti-fall device and the guide wheel device, The retractable door switch includes a retractable door lock rod, a retractable door lock rod fixing frame and a first spring, and the telescopic rod switch includes a telescopic rod mounting frame, a second spring and a telescopic switch pin. The small guide rail mounting frame includes a first small guide rail bracket, an inner guide rail frame, a second small guide rail bracket, a foot, a guide wheel device and an anti-fall device. The first small rail bracket is mounted on the top of the inner rail frame, the second small rail mounting bracket is mounted on the bottom of the inner rail mounting frame, and the anti-fall device is mounted on both sides of the inner rail frame. In the middle part of the side, the guide wheel device is installed on both sides of the top of the inner rail frame and both sides of the middle position of the inner rail frame, and the feet are installed on both sides of the second small rail bracket . The large guide rail is composed of two rows of channel steel, the channel steel is installed on the equipment to be repaired, the inside of the channel steel is welded with a card plate, and the guide wheel device includes a guide wheel pin, a first guide wheel, and a guide wheel installation. and a second guide wheel, the first guide wheel is fixed on one side of the guide wheel mounting frame through the guide wheel pin, and the second guide wheel is installed in the middle of the guide wheel mounting frame; the The anti-fall device includes a pawl mounting bracket, a pawl push rod, a third spring and a pawl, the pawl push rod is mounted on the pawl mounting bracket through the third spring, and the pawl extends and mounted on the outside of the pawl mount.

Preferably, in the folding door, the door pins are installed on both sides of the top of the stretch frame, the stretch frame is connected to the door panel mounting frame, and the door is installed on both sides of the door panel mounting frame A fixing pin mounting plate, the door panel pin shaft is fixed on the door fixing pin mounting plate, and is installed at the position where the retractable door contacts the side wall.

Preferably, in the back panel, the guide wheel devices are installed on both sides of the top of the platform mounting frame, and the anti-fall devices are installed on both sides of the middle of the platform mounting frame.

Preferably, the first side wall and the second side wall have the same structure, and the side wall includes a first side wall pivot rod, a second side wall pivot rod, a side wall connecting rod, a bottom plate support rod, and a side plate telescopic rod cylinder and side plate telescopic rod, the side wall connecting rod is hinged with the bottom plate support rod through the first side wall rotating rod and the second side wall rotating rod, the first end of the side plate telescopic cylinder and the The bottom end of the second side wall connecting rod is hinged, the second end of the side panel telescopic cylinder is hinged with the first end of the side panel telescopic rod, and the second end of the side panel telescopic rod is hinged with the first end of the side panel telescopic rod. The top end of the side wall link is hinged.

Preferably, the telescopic rod switch is fixed on the side plate telescopic cylinder through the telescopic rod mounting bracket, the telescopic switch pin is installed in the middle of the telescopic rod mounting frame through the second spring, the telescopic rod The lever switch is located on the diagonal of the side wall.

Preferably, the retractable door switch is fixed to the middle of the second sidewall pivot rod through the retractable door lock lever fixing frame, and the retractable door lock lever is installed on the retractable door via the first spring Door lock lever holder.

Preferably, the number of the anti-fall devices is four, the number of the guide wheel devices is eight, and the number installed on both sides of the car floor and on both sides of the small guide rail mounting frame is equal. The numbers of the door panel pin shafts and the door fixing pin mounting plates are equal.

Preferably, the second sidewall and the first sidewall are symmetrically arranged with respect to the platform mount, and the second sidewall and the first sidewall are parallel.

Compared with the prior art, the present invention has the following advantages:

1. The small guide rail mounting frame can extend the length of the large guide rail, so that the square car can be lowered to the position below the large guide rail, which is convenient for the operator to climb the ladder near the basic stair line and enhances the safety of the operator.

2. The structure of the square car is hinged by hinges. When it is stopped, it can be manually disassembled and stored, which increases the service life of the car, and the car is a hinged structure, which is convenient for manual replacement of parts.

3. The square car is a foldable mechanism, which saves space during transportation, and is not easy to cause structural damage during transportation in harsh environments.

4. The square car adopts triangular stable structure in many places, which meets the characteristics of low total material consumption, high structural rigidity and high structural strength.

5. The square car has the function of self-locking of the mechanism in the height direction, which increases the safety performance of the equipment.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the folding telescopic maintenance elevator of the present invention;

Figure 2 is a schematic diagram of the structure of the first part of the folding telescopic maintenance elevator car of the present invention;

Fig. 3 is the schematic diagram of the first part of the structure part A of the folding telescopic maintenance elevator car of the present invention;

Fig. 4 is the schematic diagram of the first part of the structure part B of the folding telescopic maintenance elevator car of the present invention;

FIG. 5 is a schematic structural diagram of the second part of the folding telescopic maintenance elevator car of the present invention;

6 is a schematic structural diagram of the small guide rail mounting frame part of the folding telescopic maintenance elevator of the present invention;

7 is a schematic diagram of part C of the structure of the small guide rail mounting frame of the folding telescopic maintenance elevator of the present invention;

8 is a schematic structural diagram of the foldable telescopic maintenance elevator guide wheel device of the present invention;

9 is a schematic structural diagram of the foldable telescopic maintenance elevator anti-fall device of the present invention;

10 is a schematic structural diagram of the folded state of the foldable telescopic maintenance elevator anti-fall device of the present invention; and

Fig. 11 is a schematic diagram of the structure of the fixing part of the small guide rail mounting frame of the foldable telescopic maintenance elevator according to the present invention.

Main reference signs:

Car 1, first side wall rotating rod 101, platform mounting frame 102, side wall connecting rod 103, retractable door lock lever 104, retractable door lock lever fixing frame 105, first spring 106, side door telescopic cylinder 107, side door Telescopic rod 108, telescopic rod mounting bracket 109, second spring 110, telescopic switch pin 111, second side wall pivot 112, bottom plate support rod 113, support block 114, bottom plate 115, door panel pin 116, door fixing pin mounting plate 117, door panel mounting frame 118, door pin 119, tension frame 120, small rail mounting frame 2, first small rail bracket 201, inner rail frame 202, second small rail bracket 203, foot 204, foot installation Rack 205, clamping plate 206, large guide rail 3, guide wheel device 4, guide wheel pin 401, first guide wheel 402, guide wheel mounting frame 403, second guide wheel 404, anti-fall device 5, pawl mounting frame 501, The pawl push rod 502, the third spring 503, the pawl 504.

Detailed ways

In order to detail the technical content, structural features, achieved objects and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

The folding telescopic maintenance elevator of the present invention, as shown in FIG. 1 , includes a car 1, a small guide rail mounting frame 2, a large guide rail 3, a guide wheel device 4 and an anti-fall device 5. The car 1 is installed on the guide wheel device 4 on the On the small guide rail installation frame 2, the small guide rail installation frame 2 is installed in the large guide rail 3 through the guide wheel device 4, and the large guide rail 3 is fixed on the equipment to be repaired.

As shown in Figures 2 and 5, the shape of the car 1 is square, including a retractable door, a back panel, a bottom panel, a first side wall, a second side wall, a telescopic rod switch and a retractable door switch, and the first One end and the first side wall are connected by a hinge, the second end of the back plate and the second side wall are connected by a hinge, the bottom of the back plate and the first side of the bottom plate are connected by a hinge, and the second side and the third side of the bottom plate are evenly installed The support block 114, the second side and the third side of the bottom plate are connected with the first side wall and the second side wall respectively through the support block 114, the fourth side of the bottom plate is connected with the retractable door through a hinge, and the retractable door is connected by a door panel pin shaft 116 is connected to the first side wall and the second side wall, respectively.

As shown in FIG. 5 , the retractable door includes a door panel pin shaft 116 , a door fixing pin mounting plate 117 , a door panel mounting frame 118 , a door pin 119 and a tension frame 120 , and the back panel includes a platform mounting frame 102 , an anti-fall device 5 and a guide Wheel device 4.

As shown in FIG. 4 , the retractable door switch includes a retractable door lock lever 104 , a retractable door lock lever fixing frame 105 and a first spring 106 . As shown in FIG. 3 , the telescopic rod switch includes a telescopic rod mounting bracket 109 , a second spring 110 and a telescopic switch pin 111 .

As shown in FIG. 6 , the small rail mounting frame 2 includes a first small rail bracket 201 , an inner rail frame 202 , a second small rail bracket 203 , a foot 204 , a guide wheel device 4 and an anti-fall device 5 . The first small guide rail bracket 201 is installed on the top of the inner guide rail frame 202, the second small guide rail mounting bracket 203 is installed at the bottom of the inner guide rail frame 202, the anti-fall device 5 is installed in the middle part of both sides of the inner guide rail frame 202, the guide wheel The device 4 is installed on both sides of the top of the inner rail frame 202 and on both sides of the middle position of the inner rail frame 202. As shown in FIG. 7, the foot mounting brackets 205 are installed on both sides of the second small rail bracket 203 in the form of screw connection, The foot 204 is mounted on the foot mount 205 in the form of a rotational connection.

As shown in FIG. 11 , the large guide rail 3 is composed of two rows of channel steels, the channel steels are installed on the equipment to be repaired in the form of threaded connection, and a clamping plate 206 is welded inside the channel steel.

As shown in FIG. 8 , the guide wheel device 4 includes a guide wheel pin 401 , a first guide wheel 402 , a guide wheel mounting frame 403 and a second guide wheel 404 , and the first guide wheel 402 is fixed to the guide wheel mounting frame through the guide wheel pin 401 . On one side of 403 , the second guide wheel 404 is installed in the middle of the guide wheel mounting frame 403 .

As shown in FIG. 9 , the anti-fall device 5 includes a pawl mounting bracket 501 , a pawl push rod 502 , a third spring 503 and a pawl 504 , and the pawl push rod 502 is installed on the pawl mounting bracket 501 through the third spring 503 On the upper side, the pawl 504 is extended and mounted on the outside of the pawl mounting bracket 501 .

As shown in FIG. 5 , in the folding door, the door pins 119 are installed on both sides of the top of the stretch frame 120 , the stretch frame 120 is connected with the door panel mounting frame 118 , and the door fixing pin mounting plates 117 are installed on both sides of the door panel mounting frame 118 , The door panel pin shaft 116 is fixed on the door fixing pin mounting plate 117, and is respectively installed at the position where the retractable door contacts the first side wall and the second side wall.

As shown in FIG. 4 , in the back panel, the guide wheel devices 4 are installed on both sides of the top of the platform mounting frame 102 , and the anti-fall devices 5 are installed on both sides of the middle of the platform mounting frame 102 .

As shown in FIG. 4 , the first side wall and the second side wall have the same structure. The side wall includes a first side wall rotating rod 101, a second side wall rotating rod 112, a side wall connecting rod 103, a bottom plate support rod 113, and a side plate The telescopic cylinder 107 and the side plate telescopic rod 108, the side wall connecting rod 103 is hinged with the bottom plate support rod 113 through the first side wall rotating rod 101 and the second side wall rotating rod 112, the first end of the side plate telescopic cylinder 107 and the second The bottom end of the side wall rotating rod 112 is hinged, the second end of the side plate telescopic cylinder 107 is hinged with the first end of the side plate telescopic rod 108 , the second end of the side wall telescopic rod 108 is hinged with the top end of the first side wall rotating rod 101 Hinged.

The telescopic rod switch is fixed on the side plate telescopic cylinder 107 through the telescopic rod mounting bracket 109, the telescopic switch pin 111 is installed in the middle of the telescopic rod mounting frame 109 through the second spring 110, and the telescopic rod switch is located on the first side wall and the second side respectively. on the diagonal of the wall.

The retractable door switch is fixed to the middle of the second sidewall pivot rod 112 by the retractable door lock rod fixing frame 105 , and the retractable door lock rod 104 is installed on the retractable door lock rod fixing frame 105 by the first spring 106 .

The number of anti-falling devices 5 is four, the number of guide wheel devices 4 is eight, and the number installed on both sides of the bottom plate 115 of the car 1 is equal to that installed on both sides of the small guide rail mounting frame 2. The door panel pin 116 and the door fixing pin are installed The number of plates 117 is equal.

As shown in FIG. 2 , the second side wall and the first side wall are symmetrically arranged with respect to the platform mount 102 , and the second side wall and the first side wall are parallel to each other.

The folding telescopic maintenance elevator of the present invention will be further described below in conjunction with the embodiments:

When applying the car of the folding telescopic elevator of the present invention to solve related maintenance problems, the main components must be assembled. First, the car must be installed and fixed, and the side wall connecting rod 103 and the bottom plate support rod 113 should be placed in parallel. The first end of the first side wall pivot 101 is hinged with the side wall connecting rod 103 , the second end of the first side wall pivot 101 is hinged with the bottom plate support rod 113 , and the first end of the second side wall pivot 112 is hinged. It is hinged with the side wall connecting rod 103, and the second end of the second side wall rotating rod 112 is hinged with the bottom plate support rod 113. At this time, the opposite sides of the assembled first side wall and the second side wall are parallel to each other, and the side plate is telescopic. The first end of the cylinder 107 is hinged with the bottom end of the second side wall rotating rod 112, the second end of the side panel telescopic cylinder 107 is hinged with the first end of the side panel telescopic rod 108, and the second end of the side panel telescopic rod 108 is hinged with the first end of the side panel telescopic rod 108. The top of the first side wall rotating rod 101 is hinged to enhance the stability of the side wall. The telescopic rod switch is installed on the side plate telescopic cylinder 107 through the telescopic rod mounting bracket 109, and the first side wall and the The second side wall is fixed, and the retractable door switch is installed on the second side wall rotating rod 112, and the retractable door switch is fixed on the second side wall rotating rod 112 through the retractable door lock rod fixing frame 105, when the first side When the wall and the second side wall are folded and shrunk, the folded state is fixed by closing the door lock lever 104 .

The first side wall rotating rod 101 of the first side wall and the first side wall rotating rod 101 of the second side wall are hinged and fixed to two sides of the platform mounting frame 102 respectively. The first side wall, the second side wall and the back plate form a fixed part of the car.

Next, two door pins 119 are symmetrically installed on both sides of the top of the stretch frame 120, the stretch frame 120 and the door panel mounting frame 118 are fixedly connected, four door fixing pin mounting plates 117 are installed on both sides of the door panel mounting frame 118, and the door is fixed The pin mounting plates 117 are symmetrically arranged on the upper and lower sides of the door panel mounting frame 118, and the four door panel pin shafts 116 are respectively fixed on the four door fixing pin mounting plates 117 to ensure the reliability and safety of the installation. The door pin 119 and the four door panel pin shafts 116 respectively connect the retractable door with the first side wall and the second side wall.

Next, since the second side and the third side of the bottom plate are evenly installed with the support blocks 114 , the second side and the third side of the bottom plate 115 are connected to the first side wall and the second side wall respectively through the support blocks 114 .

Each part of the car 1 is connected by connecting rod hinges, so the car can be folded after the work is completed. Remove the support block 114 of the bottom plate, remove the retractable door and the bottom plate from the car 1, loosen the telescopic switch pins 111 on the first side wall and the second side wall, and the side door telescopic rod 108 can be in the side door telescopic cylinder 107. After the folding is completed, use the folding door lock lever 104 on the folding switch to lock and fix it to reduce the space of the car 1 Location.

The guide wheel device 4 is installed on both sides of the top of the platform mounting frame 102 of the car, and the anti-fall device 5 is installed on both sides of the middle of the platform mounting frame 102 .

In the anti-fall device 5, the pawl push rod 502 is installed on the pawl mounting frame 501 through the third spring 503, the pawl 504 is extended and installed on the outside of the pawl mounting bracket 501, and the pawl is used as a ratchet device, The device can only move in one direction, which plays the role of safety protection in the device and improves the self-locking ability and reliability of the maintenance elevator during operation.

Then, assemble the small guide rail mounting frame 2, install the first small guide rail bracket 201 on the top of the inner guide rail frame 202, and install the second small guide rail bracket 203 on the bottom of the inner guide rail frame 202, and install the two sums on the car The same anti-fall device 5 is installed in the middle of both sides of the inner rail frame 202, and two guide wheel devices 4, which are the same as those installed on the car, are installed on both sides of the top of the inner rail frame 202 and at the middle of the inner rail frame 202. On both sides, the feet 204 are installed on both sides of the second small rail bracket 203 .

Finally, the assembled car 1 is installed on the bracket of the small guide rail mounting frame 2 through the guide wheel device 4 on the platform mounting frame 102, and the car 1 can be moved up and down on the small guide rail installation frame 2 through the guide wheel device 4 When moving, due to the existence of the small guide rail mounting frame 2, the car 1 can be lowered to a position below the large guide rail 3, so as to realize the adjustment of different distances and facilitate the operator to get on and off the car 1.

The traction rope passes through the guide wheel device 4 in the small guide rail mounting frame 2, and the car 1 can be moved up and down under the action of the tractor. The small guide rail mounting frame 2 is installed on the large guide rail 3 through four guide wheel devices 4, and the small The guide rail mounting frame 2 can move up and down on the large guide rail 3 through the guide wheel device 4 .

Compared with the traditional maintenance elevator, the present invention is convenient for disassembly and assembly, and solves the problems of difficult transportation and large space occupation of the traditional maintenance elevator. And the second side wall can be regarded as two relative triangular structures respectively, which reduces the occupation of space, increases the structural stability, and has a larger range of motion and stronger usability than traditional maintenance elevators.

The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. Such deformations and improvements shall fall within the protection scope determined by the claims of the present invention.

Claims (8)

1. A folding telescopic maintenance elevator comprises a car, a small guide rail mounting rack, a large guide rail, a guide wheel device and an anti-falling device, wherein the car is mounted on the small guide rail mounting rack through the guide wheel device, the small guide rail mounting rack is mounted in the large guide rail through the guide wheel device, the large guide rail is fixed on equipment to be maintained,

the lift car comprises a folding door, a back plate, a bottom plate, a first side wall, a second side wall, a telescopic rod switch and a folding door switch, wherein the first end of the back plate is connected with the first side wall through a hinge, the second end of the back plate is connected with the second side wall through a hinge, the bottom of the back plate is connected with the first side of the bottom plate through a hinge, support blocks are uniformly arranged on the second side and the third side of the bottom plate, the second side and the third side of the bottom plate are connected with the side walls through the support blocks, the fourth side of the bottom plate is connected with the folding door through a hinge, and the folding door is connected with the side walls through a door plate pin shaft;

the folding door comprises a door plate pin shaft, a door fixing pin mounting plate, a door plate mounting frame, a door pin and a stretching frame, the back plate comprises a platform mounting frame, the anti-falling device and the guide wheel device, the folding door switch comprises a folding door locking rod, a folding door locking rod fixing frame and a first spring, and the telescopic rod switch comprises a telescopic rod mounting frame, a second spring and a telescopic switch pin;

the small guide rail mounting frame comprises a first small guide rail bracket, an inner guide rail frame, a second small guide rail bracket, ground feet, guide wheel devices and anti-falling devices, the first small guide rail bracket is mounted at the top of the inner guide rail frame, the second small guide rail mounting frame is mounted at the bottom of the inner guide rail mounting frame, the anti-falling devices are mounted in the middle of two sides of the inner guide rail frame, the guide wheel devices are mounted on two sides of the top of the inner guide rail frame and two sides of the middle of the inner guide rail frame, and the ground feet are mounted on two sides of the second small guide rail bracket; and

the large guide rail comprises two rows of channel steel arranged on equipment to be maintained, clamping plates are welded inside the channel steel, the guide wheel device comprises a guide wheel pin, a first guide wheel, a guide wheel mounting frame and a second guide wheel, the first guide wheel is fixed on one side of the guide wheel mounting frame through the guide wheel pin, and the second guide wheel is arranged in the middle of the guide wheel mounting frame; the anti-falling device comprises a pawl mounting frame, a pawl push rod, a third spring and a pawl, wherein the pawl push rod penetrates through the third spring to be mounted on the pawl mounting frame, and the pawl extends out of and is mounted outside the pawl mounting frame.

2. The folding telescopic maintenance elevator as claimed in claim 1, wherein in the folding door, the door pins are installed at both sides of the top of the stretching frame, the stretching frame is connected with the door panel installation frame, the door panel installation frame is installed at both sides of the door panel installation frame, the door panel pin is fixed on the door panel installation frame, and the folding door is installed at a position where the folding door contacts with the side wall.

3. A folding telescopic service elevator as claimed in claim 1, wherein in the back plate the guide wheel means are mounted on both sides of the top of the platform mounting and the fall arrest means are mounted on both sides of the middle of the platform mounting.

4. The folding telescopic maintenance elevator as claimed in claim 1, wherein the first side wall and the second side wall have the same structure, the side wall comprises a first side wall rotating rod, a second side wall rotating rod, a side wall connecting rod, a bottom plate supporting rod, a side plate telescopic cylinder and a side plate telescopic rod, the side wall connecting rod is hinged to the bottom plate supporting rod through the first side wall rotating rod and the second side wall rotating rod, the first end of the side plate telescopic cylinder is hinged to the bottom end of the second side wall connecting rod, the second end of the side plate telescopic cylinder is hinged to the first end of the side plate telescopic rod, and the second end of the side plate telescopic rod is hinged to the top end of the first side wall connecting rod.

5. The folding telescopic maintenance elevator as claimed in claim 4, wherein the telescopic rod switch is fixed on the side plate telescopic cylinder through the telescopic rod mounting bracket, the telescopic rod switch pin is installed in the middle of the telescopic rod mounting bracket through the second spring, and the telescopic rod switch is located on the diagonal line of the side wall.

6. The folding telescopic maintenance elevator according to claim 4, wherein the folding door switch is fixed to the middle of the second side wall rotating rod through the folding door lock rod fixing frame, and the folding door lock rod is mounted to the folding door lock rod fixing frame through the first spring.

7. A folding telescopic maintenance elevator according to claim 1 or 2, characterized in that the number of said fall arrest devices is four each, the number of said guide wheel devices is eight, the number mounted on both sides of said car floor and on both sides of said small guide rail mounting brackets is equal, the number of said door panel pin shafts and said door fixing pin mounting plates is equal.

8. A folding telescopic service elevator according to claim 4, characterised in that the second side wall and the first side wall are symmetrically arranged with respect to the platform mounting, the second side wall and the first side wall being parallel.

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