A telescopic extension platform and an AGV vehicle using the same

Abstract

The application discloses a telescopic expansion platform, which comprises at least two levels of sub-platforms arranged in a stacked mode, and a push-pull device is arranged between two adjacent levels of sub-platforms to realize the telescopic expansion between the two levels of sub-platforms, and a lifting device is arranged below the sub-platforms. The application further discloses an AGV (Automatic Guided Vehicle) using the telescopic expansion platform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of AGV trolley, in particular to a long-stroke telescopic expansion platform for AGV trolley and AGV trolley using the platform. BACKGROUND

[0002] AGV trolley is widely used, when it is applied to the field of product assembly and disassembly, a lifting platform is usually arranged on the AGV trolley, and the worker stands on the lifting platform to perform low and high assembly and disassembly work on the product. However, the existing lifting platform provides a small activity space for the worker, when the worker needs to change position, the AGV trolley can only be moved to achieve this. When the structure of the product to be assembled and disassembled is complex, the AGV trolley often needs to be moved frequently, which will greatly affect the work efficiency. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a telescopic expansion platform capable of providing a larger activity space for the worker and an AGV trolley using the same.

[0004] The telescopic expansion platform in the present application comprises at least two levels of sub-platforms, the at least two levels of sub-platforms are arranged in a stacked manner, a push-pull device is connected between adjacent two levels of sub-platforms, the push-pull device can realize telescoping between the adjacent two levels of sub-platforms, and a lifting device is installed below the sub-platform.

[0005] The telescopic expansion platform in the present application, wherein the sub-platforms are three levels, the three levels of sub-platforms are a first level of sub-platform, a second level of sub-platform and a third level of sub-platform, the first level of sub-platform, the second level of sub-platform and the third level of sub-platform are arranged in a stacked manner from top to bottom, a first push-pull device is connected between the first level of sub-platform and the second level of sub-platform, a second push-pull device is connected between the second level of sub-platform and the third level of sub-platform, and a lifting device is installed below the first level of sub-platform.

[0006] The telescopic expansion platform in the present application, wherein the second level of sub-platform is slidingly installed below the first level of sub-platform, the first push-pull device is a first electric push rod, both ends of the first electric push rod are respectively hinged to the bottom of the first level of sub-platform and the second level of sub-platform, the first electric push rod can make the second level of sub-platform slide out of or into the first level of sub-platform, the third level of sub-platform is slidingly installed below the second level of sub-platform, the second push-pull device is a second electric push rod, both ends of the second electric push rod are respectively hinged to the bottom of the second level of sub-platform and the third level of sub-platform, and the second electric push rod can make the third level of sub-platform slide out of or into the second level of sub-platform.

[0007] The telescopic expansion platform in the application, wherein the first stage sub-platform comprises a first top plate and two first side plates, the two first side plates are fixedly connected to the opposite sides of the bottom of the first top plate respectively, first sliding grooves are arranged on the inner sides of the two first side plates, the second stage sub-platform comprises a second top plate and two second side plates, the two second side plates are fixedly connected to the opposite sides of the bottom of the second top plate respectively, first sliding rails are arranged on the outer sides of the two second side plates, the second stage sub-platform is slidably installed below the first stage sub-platform through the first sliding rails and the first sliding grooves, second sliding grooves are arranged on the inner sides of the two second side plates, second sliding rails are arranged on the opposite sides of the third stage sub-platform, and the third stage sub-platform is slidably installed below the second stage sub-platform through the second sliding rails and the second sliding grooves.

[0008] The telescopic expansion platform in the application, wherein the top of the first stage sub-platform is provided with a first end guardrail and two first side guardrails, the first end guardrail is arranged at the end of the first stage sub-platform away from the second stage sub-platform, the two first side guardrails are arranged on the opposite sides of the first end guardrail respectively, the top of the second stage sub-platform is provided with two second side guardrails arranged oppositely, the top of the third stage sub-platform is provided with a second end guardrail and two third side guardrails, the second end guardrail is arranged at the end of the third stage sub-platform away from the second stage sub-platform, and the two third side guardrails are arranged on the opposite sides of the second end guardrail respectively, when the first stage sub-platform, the second stage sub-platform and the third stage sub-platform are in the expansion state, the first end guardrail, the two first side guardrails, the two second side guardrails, the two third side guardrails and the second end guardrail jointly form a rectangular guardrail, and when the first stage sub-platform, the second stage sub-platform and the third stage sub-platform are in the contraction state, the two second side guardrails are located between the two first side guardrails, and the two third side guardrails are located between the two second side guardrails.

[0009] The telescopic expansion platform in the application, wherein a part of the first end guardrail is composed of a ladder stand, the lower end of the ladder stand is hinged to the first stage sub-platform, the upper end of the ladder stand is detachably and fixedly connected to the rest part of the first end guardrail through a first connecting piece, a part of one first side guardrail is composed of a lap plate, the lower end of the lap plate is hinged to the first stage sub-platform, and the upper end of the lap plate is detachably and fixedly connected to the rest part of the one first side guardrail through a second connecting piece.

[0010] The telescopic expansion platform in the application, wherein the lifting device comprises a rigid chain and a scissor structure, the movable end of the rigid chain is fixedly connected to the bottom of the first stage sub-platform, the rigid chain is driven by a motor, and the upper end of the scissor structure is connected to the bottom of the first stage sub-platform.

[0011] The telescopic expansion platform in the application, wherein two rigid chains are arranged oppositely at the bottom of the first level sub-platform, and the two rigid chains are driven by one motor, the motor is connected with the input shaft of the three-shaft gearbox, two output shafts of the three-shaft gearbox are connected with one speed reducer respectively, and the two speed reducers are connected with the two rigid chains through the shaft coupling.

[0012] The telescopic expansion platform in the application, wherein the scissor structure comprises two oppositely arranged scissor lifting arms, the upper end of the scissor lifting arm is connected to the bottom of the first level sub-platform, the upper end of the scissor lifting arm comprises an upper hinged end and an upper sliding end, the upper hinged end is hinged to the bottom of the first level sub-platform, and the upper sliding end is slidingly connected to the bottom of the first level sub-platform, and a plurality of cross bars are connected between the two scissor lifting arms.

[0013] The AGV small car using the telescopic expansion platform in the application, comprising a chassis frame, the motor, the three-shaft gearbox, the speed reducer, the shaft coupling and the rigid chain are arranged on the chassis frame, the lower end of the scissor lifting arm is connected to the chassis frame, the lower end of the scissor lifting arm comprises a lower hinged end and a lower sliding end, the lower hinged end is hinged to the chassis frame, and the lower sliding end is slidingly connected to the chassis frame.

[0014] The telescopic expansion platform in the application and the AGV small car using the same are different from the prior art in that the telescopic expansion platform in the application can be fixed on the AGV small car through the lifting device when in use, and the lifting device can adjust the height of the platform. The telescopic expansion platform can be telescoped according to actual work needs, that is, at least two level sub-platforms can be telescoped through the push-pull device, when all the sub-platforms are in the expanded state, the length of the whole platform can exceed the length of the vehicle body of the AGV small car, long stroke telescoping is realized, the activity space of the workers can be greatly increased, and thus the workers can work on the platform more conveniently. When not in use, all the sub-platforms are in the contracted state (at this time, all the sub-platforms are in the stacked arrangement state) through the push-pull device.

[0015] The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The perspective view of the AGV small car in the application Figure One (the telescopic expansion platform is in the expanded state);

[0017] Figure 2 The perspective view of the AGV small car in the application Figure Two (the telescopic expansion platform is in the expanded state);

[0018] Figure 3This describes the connection state between the chassis frame of the AGV and the telescopic extension platform in this invention. Figure One (The telescopic extension platform is in the extended state);

[0019] Figure 4 This describes the connection state between the chassis frame of the AGV and the telescopic extension platform in this invention. Figure Two (The telescopic extension platform is in the extended state);

[0020] Figure 5 This is a diagram showing the connection status between the lower hinge end and the lower sliding end of the scissor lift arm and the AGV chassis frame in this invention (the telescopic extension platform is in the extended state).

[0021] Figure 6 This is the front view of the AGV trolley in this invention (with the telescopic extension platform in an extended state);

[0022] Figure 7 For along Figure 6 Sectional view of line AA in the middle;

[0023] Figure 8 The three-dimensional representation of the AGV vehicle in this invention Figure Three (The telescopic extension platform is in the retracted state.) Detailed Implementation

[0024] like Figure 1 As shown, and in combination Figures 2-8 As shown, the telescopic expansion platform of this invention includes at least two sub-platforms arranged in a stacked manner. A push-pull device connects adjacent sub-platforms, enabling telescopic movement between them. A lifting device is installed below each sub-platform. In use, the telescopic expansion platform can be fixed to the AGV trolley 10 via the lifting device, allowing the AGV trolley 10 to carry the telescopic expansion platform to the work area.

[0025] In this embodiment, the sub-platform is configured as three levels, namely, the first level sub-platform 1, the second level sub-platform 2, and the third level sub-platform 3. The first level sub-platform 1, the second level sub-platform 2, and the third level sub-platform 3 are arranged in a stacked manner from top to bottom. A first push-pull device is connected between the first level sub-platform 1 and the second level sub-platform 2, and a second push-pull device is connected between the second level sub-platform 2 and the third level sub-platform 3. A lifting device is installed below the first level sub-platform 1.

[0026] Of course, the number of sub-platforms can be set to other quantities depending on actual needs.

[0027] like Figure 4 , Figure 7As shown in the figure, the second stage sub-platform 2 is slidingly installed below the first stage sub-platform 1, the first push-pull device is a first electric push rod 29, both ends of the first electric push rod 29 are respectively hinged to the bottom of the first stage sub-platform 1 and the second stage sub-platform 2, the first electric push rod 29 can make the second stage sub-platform 2 slide out or slide into below the first stage sub-platform 1, the third stage sub-platform 3 is slidingly installed below the second stage sub-platform 2, the second push-pull device is a second electric push rod 32, both ends of the second electric push rod 32 are respectively hinged to the bottom of the second stage sub-platform 2 and the third stage sub-platform 3, the second electric push rod 32 can make the third stage sub-platform 3 slide out or slide into below the second stage sub-platform 2.

[0028] In the embodiment, the push-pull device is an electric push rod, which is a prior art, and its specific structure and working principle will not be described here. In addition to the electric push rod, the push-pull device can also be a hydraulic cylinder or an electric cylinder.

[0029] As shown in the figure, Figure 4 , Figure 7 The first stage sub-platform 1 includes a first top plate 101 and two first side plates 102, the two first side plates 102 are respectively fixedly connected to the opposite sides of the bottom of the first top plate 101, in the embodiment, the first top plate 101 and the two first side plates 102 are an integral molding structure, the first top plate 101 and the two first side plates 102 together constitute a plate with a cross section in the shape of an inverted U, and the inner side surfaces of the two first side plates 102 are each provided with a first sliding groove 39. The second stage sub-platform 2 includes a second top plate 201 and two second side plates 202, the two second side plates 202 are respectively fixedly connected to the opposite sides of the bottom of the second top plate 201, in the embodiment, the second top plate 201 and the two second side plates 202 are an integral molding structure, the second top plate 201 and the two second side plates 202 together constitute a plate with a cross section in the shape of an inverted U, and the outer side surfaces of the two second side plates 202 are each provided with a first sliding rail 5. The second stage sub-platform 2 is slidingly installed below the first stage sub-platform 1 through the first sliding rail 5 and the first sliding groove 39, at this time, the two first sliding rails 5 are respectively located in the two first sliding grooves 39. The inner side surfaces of the two second side plates 202 are each provided with a second sliding groove 38, the opposite sides of the third stage sub-platform 3 are each provided with a second sliding rail 4, and the third stage sub-platform 3 is slidingly installed below the second stage sub-platform 2 through the second sliding rail 4 and the second sliding groove 38, at this time, the two second sliding rails 4 are respectively located in the two second sliding grooves 38.

[0030] One end of the first electric push rod 29 is hingedly connected to the bottom of the first top plate 101 of the first stage sub-platform 1 through a hinge seat 37 and a pin shaft, that is, the hinge seat 37 is fixed to the bottom of the first top plate 101, and then one end of the first electric push rod 29 is hingedly connected to the hinge seat 37 through a pin shaft; the other end of the first electric push rod 29 is also hingedly connected to the bottom of the second stage sub-platform 2 through a hinge seat 31 and a pin shaft, specifically, a support plate 30 is fixedly connected between the two second side plates 202 of the second stage sub-platform 2, the hinge seat 31 connected to the other end of the first electric push rod 29 is fixedly arranged on the support plate 30, and then the other end of the first electric push rod 29 is hingedly connected to the hinge seat 31 through a pin shaft. The support plate 30 will not affect the sliding of the third stage sub-platform 3 out of and into the second stage sub-platform 2, because the support plate 30, the two second side plates 202 and the second top plate 201 form a containing space for the third stage sub-platform 3 to slide out of and into the second stage sub-platform 2, that is, the third stage sub-platform 3 will pass through the containing space when sliding out of and into the second stage sub-platform 2.

[0031] One end of the second electric push rod 32 is hingedly connected to the bottom of the second top plate 201 of the second stage sub-platform 2 through a hinge seat 36 and a pin shaft, that is, the hinge seat 36 is fixed to the bottom of the second top plate 201, and then one end of the second electric push rod 32 is hingedly connected to the hinge seat 36 through a pin shaft; the other end of the second electric push rod 32 is also hingedly connected to the bottom of the third stage sub-platform 3 through a hinge seat 33 and a pin shaft, that is, the hinge seat 33 is fixed to the bottom of the third stage sub-platform 3, and then the other end of the second electric push rod 32 is hingedly connected to the hinge seat 33 through a pin shaft.

[0032] When the first electric push rod 29 is extended, the first electric push rod 29 pushes the second stage sub-platform 2 to slide out of the second stage sub-platform 2, at this time the first slide rail 5 slides along the first slide groove 39; on the contrary, when the first electric push rod 29 is retracted, the first electric push rod 29 pulls the second stage sub-platform 2 to slide into the second stage sub-platform 2, at this time the first slide rail 5 slides reversely along the first slide groove 39.

[0033] When the second electric push rod 32 is extended, the second electric push rod 32 pushes the third stage sub-platform 3 to slide out of the second stage sub-platform 2, at this time the second slide rail 4 slides along the second slide groove 38; on the contrary, when the second electric push rod 32 is retracted, the second electric push rod 32 pulls the third stage sub-platform 3 to slide into the second stage sub-platform 2, at this time the second slide rail 4 slides reversely along the second slide groove 38.

[0034] When changing the platform from a retracted to an extended state, the second-level sub-platform 2 can be slid out from under the first-level sub-platform 1 first. At this time, the third-level sub-platform 3 will slide out along with the second-level sub-platform 2. Then, the third-level sub-platform 3 can be slid out from under the second-level sub-platform 2. Alternatively, the third-level sub-platform 3 can be slid out from under the second-level sub-platform 2 first, and then the second-level sub-platform 2 can be slid out from under the first-level sub-platform 1. Depending on the actual needs, the operator can control the amount of sliding of the second-level sub-platform 2 from under the first-level sub-platform 1, and also control the amount of sliding of the third-level sub-platform 3 from under the second-level sub-platform 2. When the platform is in the extended state, the first-level sub-platform 1, the second-level sub-platform 2, and the third-level sub-platform 3 together form a work surface for the operator to work on.

[0035] When changing the platform from an extended state to a retracted state, you can first slide the third sub-platform 3 under the second sub-platform 2, and then slide the second sub-platform 2 under the first sub-platform 1. At this time, the third sub-platform 3 will slide in along with the second sub-platform 2. Alternatively, you can first slide the second sub-platform 2 under the first sub-platform 1, and then slide the third sub-platform 3 under the second sub-platform 2.

[0036] like Figure 1 As shown, and in combination Figures 2-6 , Figure 8 As shown, the top of the first-level sub-platform 1 is provided with a first end guardrail 16 and two first side guardrails 14. The first end guardrail 16 is located at the end of the first-level sub-platform 1 that slides out from the second-level sub-platform 2. The two first side guardrails 14 are respectively located on opposite sides of the first end guardrail 16. The top of the second-level sub-platform 2 is provided with two oppositely arranged second side guardrails 13. The top of the third-level sub-platform 3 is provided with a second end guardrail 11 and two third side guardrails 12. The second end guardrail 11 is located at the end of the third-level sub-platform 3 that slides out from the second-level sub-platform 2. The two third side guardrails 12... The guardrails are respectively installed on opposite sides of the second end guardrail 11. When the first sub-platform 1, the second sub-platform 2, and the third sub-platform 3 are in the extended state, the first end guardrail 16, the two first side guardrails 14, the two second side guardrails 13, the two third side guardrails 12, and the second end guardrail 11 together form a rectangular guardrail. When the first sub-platform 1, the second sub-platform 2, and the third sub-platform 3 are in the retracted state, the two second side guardrails 13 are located between the two first side guardrails 14, and the two third side guardrails 12 are located between the two second side guardrails 13. The guardrails enhance the safety of workers.

[0037] One part of the first end guardrail 16 is composed of a ladder 15, the lower end of which is hinged to the first sub-platform 1, and the upper end of which is detachably fixedly connected to the rest of the first end guardrail 16 through a first connecting member (such as a bolt).

[0038] As shown in Figure 1 and shown in Figures 2-7 , the lifting device comprises a rigid chain 6 and a scissor structure, the movable end of the rigid chain 6 is fixedly connected to the bottom of the first sub-platform 1, the rigid chain 6 is driven by a motor 22, and the upper end of the scissor structure is connected to the bottom of the first sub-platform 1.

[0039] The rigid chain 6 is provided in two, the two rigid chains 6 are oppositely arranged on the bottom of the first sub-platform 1, and the two rigid chains 6 are both driven by one motor 22, the motor 22 is connected with the input shaft of a three-shaft gear box 21, two output shafts of the three-shaft gear box 21 are respectively connected with one speed reducer 20, and the two speed reducers 20 are respectively connected with the two rigid chains 6 through a shaft coupling 19.

[0040] The rigid chain 6 is a prior art, and its specific structure and working principle will not be described here.

[0041] The scissor structure comprises two oppositely arranged scissor lifting arms 8, the upper end of the scissor lifting arm 8 is connected to the bottom of the first sub-platform 1, the upper end of the scissor lifting arm 8 comprises an upper hinged end 25 and an upper sliding end 23, the upper hinged end 25 is hinged to the bottom of the first sub-platform 1, and the upper sliding end 23 is slidingly connected to the bottom of the first sub-platform 1, and a plurality of cross bars 7 are connected between the two scissor lifting arms 8.

[0042] The scissor lifting arm 8 is a prior art, which comprises three levels of upper, middle and lower scissor arms, each level of scissor arm comprises two support rods 9 hinged to each other, and the upper and lower adjacent two levels of scissor arms are also hinged to each other. The upper ends of the two support rods 9 in the upper level of the scissor arm 8 are respectively the upper hinged end 25 and the upper sliding end 23, and the lower ends of the two support rods 9 in the lower level of the scissor arm 8 are respectively the lower hinged end 35 and the lower sliding end 34. A plurality of cross bars 7 are connected between the upper levels of the two scissor lifting arms 8, the middle levels of the scissor arms and the lower levels of the scissor arms respectively, and the cross bars 7 can ensure that the two scissor lifting arms 8 are lifted at the same time.

[0043] When the movable end of the rigid chain 6 is fixedly connected to the bottom of the first sub-platform 1, the two rigid chains 6 are spaced apart by a sufficient distance, so that when the second sub-platform 2 and the third sub-platform 3 slide under the first sub-platform 1, they can slide between the two rigid chains 6, and the rigid chains 6 do not interfere with the sliding of the second sub-platform 2 and the third sub-platform 3. Similarly, when the upper end of the scissor lifting arm 8 is connected to the bottom of the first sub-platform 1, the two scissor lifting arms 8 are spaced apart by a sufficient distance, so that when the second sub-platform 2 and the third sub-platform 3 slide under the first sub-platform 1, they can slide between the two scissor lifting arms 8, and the scissor lifting arms 8 do not interfere with the sliding of the second sub-platform 2 and the third sub-platform 3.

[0044] As shown in Figure 4 , Figure 7 , in this embodiment, a plurality of reinforcing rods 28 are arranged on the bottom of the first sub-platform 1, and a receiving space is formed between the reinforcing rods 28 and the first sub-platform 1. The movable end of the rigid chain 6 is fixedly connected to the reinforcing rods 28, and the upper end of the scissor lifting arm 8 is also connected to the reinforcing rods 28. That is, the movable end of the rigid chain 6 and the upper end of the scissor lifting arm 8 are both fixedly connected to the bottom of the first sub-platform 1 through the reinforcing rods 28. When the second sub-platform 2 and the third sub-platform 3 slide under the first sub-platform 1, they can slide into the above-mentioned receiving space, and the rigid chain 6 and the scissor lifting arm 8 do not interfere with the sliding of the second sub-platform 2 and the third sub-platform 3. Thus, the reinforcing rods 28 have two functions: one is to enhance the structural strength of the first sub-platform 1, and the other is to provide a connection position for the rigid chain 6 and the scissor lifting arm 8 to connect to the first sub-platform 1, so that the rigid chain 6 and the scissor lifting arm 8 do not interfere with the sliding of the second sub-platform 2 and the third sub-platform 3.

[0045] As shown in Figure 1 , and as shown in Figures 2-8 , the AGV 10 using the above-mentioned telescopic expansion platform in the present application comprises a chassis frame 18, the chassis frame 18 is provided with the motor 22, the three-shaft gear box 21, the speed reducer 20, the shaft coupling 19 and the rigid chain 6. The lower end of the scissor lifting arm 8 is connected to the chassis frame 18. The lower end of the scissor lifting arm 8 comprises a lower hinged end 35 and a lower sliding end 34. The lower hinged end 35 is hinged to the chassis frame 18, and the lower sliding end 34 is slidingly connected to the chassis frame 18.

[0046] The upper hinged end 25 of the scissor lifting arm 8 is hinged on the reinforcing rod 28 below the first stage sub-platform 1 through a hinged seat 26 and a pin shaft, i.e. the hinged seat 26 is fixed on the reinforcing rod 28, and the upper hinged end 25 is hinged on the hinged seat 26 through a pin shaft. The upper sliding end 23 of the scissor lifting arm 8 is slidingly connected on the reinforcing rod 28 through a sliding block 24 and a strip-shaped track 27, i.e. the upper sliding end 23 is provided with the sliding block 24, the reinforcing rod 28 is provided with the strip-shaped track 27, and the upper sliding end 23 is slidingly connected on the strip-shaped track 27 through the sliding block 24. The lower end (i.e. the lower hinged end 35 and the lower sliding end 34) of the scissor lifting arm 8 is connected on the chassis frame 18 in the same way as the upper end (i.e. the upper hinged end 25 and the upper sliding end 23) is connected on the reinforcing rod 28, which will not be described here.

[0047] The scissor lifting arm 8 and the rigid chain 6 cooperate with each other to realize the lifting of the platform. During the lifting, the upper hinged end 25 and the lower hinged end 35 of the scissor lifting arm 8 rotate relative to the reinforcing rod 28 and the chassis frame 18 respectively, and the upper sliding end 23 and the lower sliding end 34 of the scissor lifting arm 8 slide relative to the reinforcing rod 28 and the chassis frame 18 respectively.

[0048] The chassis frame 18 is used to install parts required for the normal driving of the AGV trolley 10, such as wheel set devices, power devices, control devices and power sources, etc. It is a prior art, which will not be described here.

[0049] In use, the AGV 10 is controlled to move to a required position, then the first connecting piece is removed, the upper end of the ladder 15 is released from the first end guardrail 16, and the worker can climb onto the platform through the ladder 15, then the ladder 15 is retracted and rotated, and the upper end of the ladder 15 is connected to the first end guardrail 16 through the first connecting piece. Then the motor 22 is started in the forward direction, the motor 22 drives the movable end of the rigid chain 6 to rise through the three-shaft gear box 21, the speed reducer 20 and the shaft coupling 19, and the scissor lifting arm 8 also rises in this process. When the platform rises to the required height, the motor 22 is turned off, then the second stage sub-platform 2 is slid out from below the first stage sub-platform 1 through the first electric push rod 29, the third stage sub-platform 3 is slid out from below the second stage sub-platform 2 through the second electric push rod 32, and the extension of the three-stage platform is completed. The length of the entire platform can exceed the length of the AGV 10, realizing long-stroke extension. In this way, the worker can work on the first stage sub-platform 1, the second stage sub-platform 2 and the third stage sub-platform 3, greatly increasing the working space. Sometimes, more than one AGV 10 is used, and when two AGV 10s are used side by side, the second connecting piece can be removed, the overlap plate 17 can be turned down and laid, and the overlap plate 17 can be overlapped between the platforms of the two AGV 10s, realizing the connection of the walking channel between the AGV 10s. After the work is completed, the overlap plate 17 is turned up and retracted and connected to the first side guardrail 14 through the second connecting piece. Then the second stage sub-platform 2 is slid into the first stage sub-platform 1 through the first electric push rod 29, and the third stage sub-platform 3 is slid into the second stage sub-platform 2 through the second electric push rod 32, and the contraction of the three-stage platform is completed. Then the motor 22 is started in the reverse direction, the motor 22 drives the movable end of the rigid chain 6 to descend through the three-shaft gear box 21, the speed reducer 20 and the shaft coupling 19, and the scissor lifting arm 8 also descends in this process. When it descends to the appropriate height, the ladder 15 is released again, and the worker can go from the platform to the ground through the ladder 15.

[0050] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The above-described embodiments are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A telescopic expansion platform, characterized in that: It includes at least two levels of sub-platforms, which are arranged in a stacked manner. A push-pull device connects adjacent sub-platforms, enabling extension and retraction between them. A lifting device is installed beneath each sub-platform. The sub-platform is configured in three levels: a first-level sub-platform, a second-level sub-platform, and a third-level sub-platform. These three sub-platforms are stacked sequentially from top to bottom. A first push-pull device connects the first-level and second-level sub-platforms, and a second push-pull device connects the second-level and third-level sub-platforms. A lifting device is installed below the first-level sub-platform. The top of the first-level sub-platform is equipped with a first end guardrail and two first side guardrails. The first end guardrail is located at the end of the first-level sub-platform that extends away from the second-level sub-platform, and the two first side guardrails are respectively located on opposite sides of the first end guardrail. A portion of the first end guardrail consists of a ladder, the lower end of which is hinged to a first-level sub-platform, and the upper end of which is detachably and fixedly connected to the rest of the first end guardrail via a first connector. A portion of a first side guardrail consists of an overlapping plate, the lower end of which is hinged to a first-level sub-platform, and the upper end of which is detachably and fixedly connected to the rest of the first side guardrail via a second connector. The lifting device includes a rigid chain and a scissor lift structure. Multiple reinforcing rods are provided at the bottom of the first-level sub-platform, and a receiving space is formed between the reinforcing rods and the first-level sub-platform. The movable end of the rigid chain is fixedly connected to the reinforcing rods, and the upper end of the scissor lift arm is also connected to the reinforcing rods. When the second-level sub-platform and the third-level sub-platform slide under the first-level sub-platform, they can slide into the aforementioned receiving space.

2. The telescopic expansion platform according to claim 1, characterized in that: The second-level sub-platform is slidably installed below the first-level sub-platform. The first push-pull device is a first electric push rod, with both ends of the first electric push rod hinged to the bottom of the first-level and second-level sub-platforms respectively. The first electric push rod can cause the second-level sub-platform to slide out or slide into the bottom of the first-level sub-platform. The third-level sub-platform is slidably installed below the second-level sub-platform. The second push-pull device is a second electric push rod, with both ends of the second electric push rod hinged to the bottom of the second-level and third-level sub-platforms respectively. The second electric push rod can cause the third-level sub-platform to slide out or slide into the bottom of the second-level sub-platform.

3. The telescopic expansion platform according to claim 2, characterized in that: The first-level sub-platform includes a first top plate and two first side plates, which are respectively fixedly connected to opposite sides of the bottom of the first top plate. Each of the two first side plates has a first sliding groove on its inner side surface. The second-level sub-platform includes a second top plate and two second side plates, which are respectively fixedly connected to opposite sides of the bottom of the second top plate. Each of the two second side plates has a first slide rail on its outer side surface. The second-level sub-platform is slidably installed below the first-level sub-platform via the first slide rail and the first sliding groove. Each of the two second side plates has a second sliding groove on its inner side surface. The third-level sub-platform has second slide rails on opposite sides, and is slidably installed below the second-level sub-platform via the second slide rail and the second sliding groove.

4. The telescopic expansion platform according to claim 3, characterized in that: The top of the second-level sub-platform is provided with two opposing second side rails, and the top of the third-level sub-platform is provided with a second end rail and two third side rails. The second end rail is located at one end of the third-level sub-platform that slides out of the second-level sub-platform, and the two third side rails are respectively located on opposite sides of the second end rail. When the first-level sub-platform, the second-level sub-platform, and the third-level sub-platform are in the extended state, the first end rail, the two first side rails, the two second side rails, the two third side rails, and the second end rail together form a rectangular railing. When the first-level sub-platform, the second-level sub-platform, and the third-level sub-platform are in the retracted state, the two second side rails are located between the two first side rails, and the two third side rails are located between the two second side rails.

5. The telescopic expansion platform according to claim 4, characterized in that: The movable end of the rigid chain is fixedly connected to the bottom of the first-level sub-platform. The rigid chain is driven by a motor, and the upper end of the scissor structure is connected to the bottom of the first-level sub-platform.

6. The telescopic expansion platform according to claim 5, characterized in that: Two rigid chains are provided, and the two rigid chains are arranged opposite each other at the bottom of the first-level sub-platform. Both rigid chains are driven by a motor, which is connected to the input shaft of a three-axis gearbox. The two output shafts of the three-axis gearbox are respectively connected to a reducer, and the two reducers are respectively connected to the two rigid chains through couplings.

7. The telescopic expansion platform according to claim 6, characterized in that: The scissor lift structure includes two scissor lift arms arranged opposite each other. The upper end of each scissor lift arm is connected to the bottom of the first-level sub-platform. The upper end of each scissor lift arm includes an upper hinge end and an upper sliding end. The upper hinge end is hinged to the bottom of the first-level sub-platform, and the upper sliding end is slidably connected to the bottom of the first-level sub-platform. Multiple crossbars are connected between the two scissor lift arms.

8. An AGV (Automated Guided Vehicle) using the telescopic extension platform according to any one of claims 1-7, characterized in that: The device includes a chassis frame, on which a motor, a three-axis gearbox, a reducer, a coupling, and a rigid chain are mounted. The lower end of the scissor lift arm is connected to the chassis frame. The lower end of the scissor lift arm includes a lower hinge end and a lower sliding end. The lower hinge end is hinged to the chassis frame, and the lower sliding end is slidably connected to the chassis frame.

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