Foldable pushing chain type lifting platform

Abstract

A foldable pushing chain type lifting platform belongs to the technical field of pushing chains and lifting platforms and comprises a meshed pushing chain system, an X-axis limiting mechanism and a Y-axis limiting mechanism, one side of the bottom of the meshed pushing chain system is fixedly connected with a base, the meshed pushing chain system outputs pushing chains upwards in the Z-axis direction, and the X-axis limiting mechanism and the Y-axis limiting mechanism are fixedly connected with the base. The top end of the pushing chain is fixedly connected with a top table used for bearing a lifted object, an X-axis limiting mechanism is further connected between the top table and the base, and the side, away from the meshing type pushing chain system, of the X-axis limiting mechanism is connected with a Y-axis limiting mechanism. The X-axis limiting mechanism is of a folding arm structure which only rotates around the X axis and limits the pushing chain and the top table to move in the X-axis direction. According to the invention, the pushing chain is used as a driving part, and the device has the advantages of high speed, large bearing capacity, high precision, long maintenance period, multi-point control, good stability, low initial height, large stroke, small occupied space and strong environmental adaptability.

Description

Technical Field

[0001] The invention belongs to the technical field of push chains and lifting platforms, and in particular relates to a foldable push chain lifting platform. Background Art

[0002] In the field of lifting platform technology, most lifting platforms are currently driven by hydraulic cylinders, screws, traditional chains, belts and other transmission methods. However, hydraulic lifts have disadvantages such as oil leakage and low precision, screw lifts are slow, and chain or belt lifts have disadvantages such as poor precision and large space occupation. There are also lifting platforms driven by push chains on the market. Most lifting platforms use a scissor fork structure. However, the initial height of the scissor fork lifting platform is larger than that of other types of platforms, and the stroke is limited by the length of the scissor fork structure, which cannot meet the customer's requirements for a large stroke. In addition, since the lifting table needs to be connected to a guide device, the table size is too large. Summary of the invention

[0003] The present invention discloses a foldable push chain lifting platform, which uses a push chain as a driving component and has the advantages of high speed, large load, high precision, long maintenance cycle and multi-point control. By combining the folding arm structure with the push chain linear drive, it not only inherits the advantages of the push chain drive, but also has the advantages of good stability, low initial height, large stroke, small occupied space, strong environmental adaptability, etc.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A foldable push chain lifting platform comprises a meshing push chain system, an X-axis limiting mechanism and a Y-axis limiting mechanism. A base is fixedly connected to one side of the bottom of the meshing push chain system. The meshing push chain system outputs the push chain upward along the Z-axis. A top platform for carrying a lifted object is fixedly connected to the top of the push chain. An X-axis limiting mechanism is also connected between the top platform and the base. A Y-axis limiting mechanism is connected to a side of the X-axis limiting mechanism away from the meshing push chain system. The X-axis limiting mechanism is a folding arm structure that only rotates around the X-axis and limits the push chain and the top platform from moving along the X-axis. A Y-axis limiting mechanism is connected between the outer side of the hinge of the folding arm structure and the ground.

[0006] Preferably, the folding arm structure includes an articulated seat, which is a U-shaped plate structure with an open end facing one side of the push chain, the inner and outer sides of the top and bottom ends of the articulated seat are respectively provided with a first articulated axis arranged along the X-axis direction, the inner and outer sides of the bottom of the top platform are respectively provided with a second articulated axis along the X-axis direction, an inner support arm 1 is connected between the first articulated axis on the inner side of the top of the articulated seat and the second articulated axis on the inner side of the bottom of the top platform, and an outer support arm 1 is connected between the first articulated axis on the outer side of the top of the articulated seat and the second articulated axis on the outer side of the bottom of the top platform; the inner and outer sides of the upper end of the base are respectively provided with a third articulated axis along the X-axis direction, an inner support arm 2 is connected between the third articulated axis on the inner side of the base and the first articulated axis on the inner side of the bottom of the articulated seat, and an outer support arm 2 is connected between the third articulated axis on the outer side of the base and the first articulated axis on the outer side of the bottom of the articulated seat.

[0007] Preferably, the axis connecting the first hinge axis at both ends of the inner support arm 1 and the second hinge axis constitutes a first parallelogram structure; the axis connecting the first hinge axis at both ends of the inner support arm 2 and the third hinge axis constitutes a second parallelogram structure, the first parallelogram structure and the second parallelogram structure are mirror-imaged with respect to the horizontal center plane of the articulated seat, the bottom of the meshing push chain system is fixedly connected to the front end of the base, and the top of the push chain is fixedly connected to the front end of the top platform.

[0008] Preferably, a linear guide rail is provided in the middle of the inner surface of the two side walls of the articulated seat along the Y-axis direction, a bearing seat is connected to the linear guide rail through a slider, a bearing is embedded in the bearing seat, the inner ring of the bearing is interference fit with a rotating shaft arranged along the X-axis direction, a rotating shaft 2 is provided in the middle of the inner support arm 1 along the X-axis direction, a rotating shaft 3 is provided in the middle of the inner support arm 2 along the X-axis direction, an upper pull rod is connected between one rotating shaft 1 and the rotating shaft 2, a lower pull rod is connected between the other rotating shaft 1 and the rotating shaft 3, and the upper pull rod and the lower pull rod have the same angle with the horizontal center plane of the articulated seat.

[0009] Preferably, the Y-axis limiting mechanism includes a linear guide rail 2 fixed on the ground along the Y-axis direction and a side pull rod, the linear guide rail 2 is slidably connected with a slider 2, the top of the slider 2 is fixedly connected with a bearing seat 2, the top of the bearing seat 2 is rotatably connected with a rotating shaft 4 along the X-axis, the rotating shaft 4 is rotatably connected to the bottom of the side pull rod, the top of the side pull rod is also rotatably connected to a mounting seat, and the mounting seat is fixedly connected to the back of the hinged seat.

[0010] Preferably, the slider 2 is provided with a locking mechanism for fixing it to the linear guide rail 2. The locking mechanism is a positioning bolt that passes through the slider 2 and is threadedly connected to the slider 2, or a driving mechanism that is connected to the slider 2 and drives the slider 2 to move along the linear guide rail 2. The driving mechanism is driven by a motor, and the relative fixation of the slider 2 and the linear guide rail 2 is achieved when the motor stops and is locked.

[0011] A method for using a foldable push chain lifting platform comprises the following steps:

[0012] (1) The push chain contracts, and at the same time, driven by the driving mechanism, the slider 2 moves synchronously along the linear guide rail 2 toward the side away from the base until the top platform reaches the required height;

[0013] (2) Place the object to be lifted on the top platform, start the meshing push chain system and drive mechanism, and lift the object to the required height.

[0014] Preferably, in the steps (1) and (2), the driving mechanism only plays the role of Y-axis limiting, specifically: the driving mechanism is set so that the distance moved by the slider 2 on the linear guide rail matches the length of the extension or shortening of the push chain during the lifting or lowering of the push chain. At this time, the top platform is always in a horizontal state, and the Y-axis force on the push chain is minimized, thereby achieving Y-axis limiting.

[0015] Preferably, in the steps (1) and (2), the folding arm structure only rotates around the X-axis direction, and while assisting the lifting and lowering of the top platform, it limits the movement of the push chain along the X-axis direction, thereby achieving X-axis limitation of the push chain.

[0016] The beneficial effects of the foldable push chain lifting platform of the present invention are:

[0017] (1) The present invention uses a foldable lifting mechanism to greatly reduce the starting height of the lifting platform, increase the travel of the lifting platform, and make the lifting platform have a higher compression ratio;

[0018] (2) The present invention reduces the size of the lifting plane and the spatial range during the movement process through a foldable lifting mechanism;

[0019] (3) The present invention uses a push chain to directly connect the top platform, which can accurately control the height of the top platform and improve the transmission efficiency;

[0020] (4) The push chain lifting platform of the present invention has strong environmental adaptability and can be used in high and low temperature, dusty environments, etc.;

[0021] (5) The present invention adds a detachable side tie rod component, which is beneficial to the stability of the entire lifting platform. The side tie rod can be increased or decreased according to application needs, and is easy to disassemble and assemble;

[0022] (6) The lifting platform of the present invention uses a meshing push chain system, which has the advantages of high speed, large bearing capacity, high precision, compact space and long maintenance cycle;

[0023] (7) The present invention uses the first servo motor as the driving force source, which can control the lifting platform to dock at any position, and the motor driving force can ensure that the lifting platform does not sink;

[0024] (8) The lifting platforms of the present invention can be used symmetrically or in combination side by side, and multiple platforms (2, 4, etc.) can be linked to lift one or more objects at the same time.

[0025] (9) The present invention can greatly improve the stability of the push chain and the top platform during the lifting process by setting up X and Y axial limit mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : A schematic diagram of the structure of the push chain lifting platform of the present invention.

[0027] Figure 2 : Front view of the push chain lifting platform of the present invention (the dotted line part in the figure shows the posture of the platform being lowered).

[0028] Figure 3 : A three-dimensional structural diagram of an articulated seat of the present invention.

[0029] Figure 4 : A front structural diagram of an articulated seat of the present invention.

[0030] Figure 5 : The cross-sectional structural diagram of the hinge seat along AA direction of the present invention.

[0031] Figure 6 : Structural diagram of the Y-axis limiting mechanism of the present invention.

[0032] Figure 7 : The lifting platform of the present invention is in the raised state.

[0033] Figure 8 : The lifting platform of the present invention is in a lowered state.

[0034] Fig. 9 : Structural diagram of base of the present invention.

[0035] Fig.10 : Top platform structure diagram of the present invention.

[0036] Fig.11 : Structural diagram of the articulated seat of the present invention.

[0037] Fig.12 : Structural diagram of one or two inner arms of the present invention.

[0038] Fig.13 : A structural diagram of one or two outer support arms of the present invention.

[0039] Fig.14 : Structural diagram of the upper pull rod of the present invention.

[0040] Fig.15 : Structural diagram of the pull rod of the present invention.

[0041] In the figure: 01, lifted object; 02, fixed base; 1, meshing push chain system; 101, push chain; 102, first servo motor; 2, base; 3, top platform; 4, hinged seat; 401, hinged seat; 402, bearing seat one; 403, hinged seat reinforcement plate; 404, linear guide one; 5, Y-axis limit mechanism; 501, mounting seat; 502, bearing seat two; 503, side pull rod; 504, slider two; 6, inner support arm one; 7, inner support arm two; 8, outer support arm one; 9, outer support arm two; 10, upper pull rod; 11, lower pull rod. DETAILED DESCRIPTION

[0042] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0043] The following embodiments may be understood as individually expressing a part of a local structure or method of the present invention, or may be understood as a combination of the embodiments to explain the connotation of a larger structure or method of the present invention.

[0044] Example 1

[0045] A foldable push chain lifting platform, such as Figure 1-15 As shown, it includes a meshing push chain system 1, an X-axis limiting mechanism, and a Y-axis limiting mechanism 5. One side of the bottom of the meshing push chain system 1 is fixedly connected to a base 2. The meshing push chain system 1 outputs a push chain 101 upward along the Z axis. The top of the push chain 101 is fixedly connected to a top platform 3 for carrying a lifted object 01. An X-axis limiting mechanism is also connected between the top platform 3 and the base 2. A Y-axis limiting mechanism is connected to the side of the X-axis limiting mechanism away from the meshing push chain system 1. The X-axis limiting mechanism is a folding arm structure that only rotates around the X-axis to limit the movement of the push chain and the top platform along the X-axis. A Y-axis limiting mechanism is connected between the outer side of the hinge of the folding arm structure and the ground.

[0046] In this embodiment, the meshing push chain system 1 adopts the existing patent CN220131061U, a meshing push chain system, whose output push chain 101 has rigidity and can withstand pressure and tension. For details, please refer to the patent document. The X-axis limit mechanism and the Y-axis limit mechanism are both used to improve the stability of the push chain 101 and the top platform during the lifting or lowering process, ensuring that the lifted object 01 can smoothly reach the specified height.

[0047] Example 2

[0048] like Figure 1 , 2 As shown, the folding arm structure includes an articulated seat 4, which is a U-shaped plate structure with an open end facing the push chain 101. The inner and outer sides of the top and bottom ends of the articulated seat 4 are respectively provided with a first articulated axis arranged along the X-axis (such as Figure 2 As shown, not marked in the figure), the inner and outer sides of the bottom of the top platform 3 are respectively provided with a second hinge axis along the X-axis (such as Figure 2 As shown, not marked in the figure), an inner support arm 6 is connected between the first hinge axis on the inner side of the top of the articulated seat 4 and the second hinge axis on the inner side of the bottom of the top platform 3, and an outer support arm 8 is connected between the first hinge axis on the outer side of the top of the articulated seat 4 and the second hinge axis on the outer side of the bottom of the top platform 3; the inner and outer sides of the upper end of the base 2 are respectively provided with a third hinge axis along the X-axis direction, an inner support arm 2 7 is connected between the third hinge axis on the inner side of the base 2 and the first hinge axis on the inner side of the bottom of the articulated seat 4, and an outer support arm 2 9 is connected between the third hinge axis on the outer side of the base 2 and the first hinge axis on the outer side of the bottom of the articulated seat 4.

[0049] like Figure 1 , 2 As shown, the axis connecting the first hinge axis and the second hinge axis at both ends of the inner support arm 6 and the outer support arm 8 constitutes a first parallelogram structure; the axis connecting the first hinge axis and the third hinge axis at both ends of the inner support arm 2 7 and the outer support arm 2 9 constitutes a second parallelogram structure, the first parallelogram structure and the second parallelogram structure are mirror-imaged about the horizontal center plane of the articulated seat 4, the bottom of the meshing push chain system 1 is fixedly connected to the front end of the base 2, and the top of the push chain 101 is fixedly connected to the front end of the top platform 3.

[0050] like Figure 1-5 As shown, a linear guide 404 is respectively provided in the middle of the inner surfaces of the two side walls of the articulated seat 4 along the Y-axis direction, and a bearing seat 402 is connected to the linear guide 404 through a slider, a bearing is embedded in the bearing seat 402, and the inner ring of the bearing is interference fit with a rotating shaft 1 arranged along the X-axis direction, a rotating shaft 2 is provided in the middle of the inner support arm 6 along the X-axis direction, and a rotating shaft 3 is provided in the middle of the inner support arm 2 7 along the X-axis direction, an upper pull rod 10 is connected between one rotating shaft 1 and the rotating shaft 2, and a lower pull rod 11 is connected between the other rotating shaft 1 and the rotating shaft 3, and the upper pull rod 10 and the lower pull rod 11 have the same angle with the horizontal center plane of the articulated seat 4.

[0051] In this embodiment, Figure 1 , 2As shown, when the top of the top platform is kept horizontal due to the fixed push chain and the bottom of the base is also horizontal, as the push chain rises and falls, the first and second parallelogram structures are deformed accordingly, and an isosceles triangle structure is formed between the hinge seat, the top platform and the base, so the angles between the first and second parallelogram structures and the horizontal midplane of the hinge seat are always the same.

[0052] Example 3

[0053] like Figure 1 , 2 As shown in Figures 6, 7 and 8, the Y-axis limiting mechanism includes a linear guide rail 2 fixed on the ground along the Y-axis direction and a side tie rod 503, a slider 2 504 is slidably connected to the linear guide rail 2, a bearing seat 2 502 is fixedly connected to the top of the slider 2 504, a rotating shaft 4 is rotatably connected to the top of the bearing seat 2 502 along the X-axis, the rotating shaft 4 is rotatably connected to the bottom of the side tie rod 503, and the top of the side tie rod 503 is also rotatably connected to a mounting seat 501, and the mounting seat 501 is fixedly connected to the back of the articulated seat 4.

[0054] In Examples 2 and 3, it should be understood that the push chain moves along the Z-axis, and the strength of the "steel column" structure formed by it and the strength of the connection with the base and the top platform can withstand the lateral force applied to the push chain by the X-axis limit mechanism, the Y-axis limit mechanism, and the lifted object due to their respective gravity, thereby ensuring the stability of the lifted goods.

[0055] Example 4

[0056] Based on Examples 1-3, this embodiment discloses:

[0057] like Figure 6 As shown, the slider 2 504 is provided with a locking mechanism for fixing with the linear guide rail 2, and the locking mechanism is a positioning bolt (not shown in the figure) that passes through the slider 2 and is screwed to the slider 2 504.

[0058] In this embodiment, Figure 6 As shown, when the lifted cargo reaches a certain height, it can be locked with the bolt hole at the top of the second linear guide rail by means of the positioning bolt. Due to the limitation of the Y-axis limiting mechanism, the push chain cannot move along the Y-axis. Since the first parallelogram structure and the second parallelogram structure of the X-axis limiting mechanism can only rotate around the X-axis, the displacement of the push chain along the X-axis is limited. Therefore, the limit of the push chain in the X- and Y-axis directions is realized, which further ensures the stability of the position of the push chain itself, and then ensures the stability of the lifted object.

[0059] Example 5

[0060] Based on Examples 1-3, this embodiment discloses:

[0061] like Figure 6 As shown, the slider 2 504 is provided with a driving mechanism which is connected to the slider 2 504 and drives the slider 2 to move along the linear guide rail 2. The driving mechanism is driven by a motor, and when the motor stops and is locked, the slider 2 and the linear guide rail 2 are relatively fixed.

[0062] This embodiment provides a method of controlling the position of the slider 2 through a driving mechanism, wherein the driving mechanism used on the track is conventional, for example, a strip groove can be provided at the top of the linear guide rail 2 along the length direction, a rack structure is provided at the bottom of the strip groove, and the driving mechanism may include a moving seat fixedly connected to the slider, the moving seat is provided with a through hole penetrating the strip groove, a gear is passed through the through hole, the gear is meshed and connected with the rack, the gear is also connected to a motor, and the motor is fixed on the moving seat. In this way, the real-time limit of the Y-axis direction of the push chain can be achieved through the synchronous action of the motor and the push chain.

[0063] Example 6

[0064] Based on the above embodiments, this embodiment discloses a method for using a foldable push chain lifting platform, such as Figure 1-15 As shown, the following steps are included:

[0065] (1) The push chain contracts, and at the same time, the slider 2 504 is driven by the driving mechanism to move synchronously along the linear guide rail 2 to the side away from the base 2 until the top platform 3 reaches the required height;

[0066] (2) The object to be lifted is placed on the top platform, and the meshing push chain system 1 and the driving mechanism are started to lift the object to the required height.

[0067] In the steps (1) and (2), the driving mechanism only plays the role of limiting the Y-axis direction. Specifically, the driving mechanism is set so that the distance moved by the slider 2 504 on the linear guide rail matches the length of the extension or contraction of the push chain 101 during the lifting or lowering of the push chain. At this time, the top platform 3 is always in a horizontal state, and the Y-axis force on the push chain is minimized, thereby achieving Y-axis limiting.

[0068] In the steps (1) and (2), the folding arm structure only rotates around the X-axis direction, and while assisting the lifting of the top platform, it limits the movement of the push chain 101 along the X-axis direction, thereby limiting the position of the push chain in the X-axis direction.

[0069] In this embodiment, taking into account the lateral forces applied to the push chain by the X-axis limiting mechanism, the Y-axis limiting mechanism, and the lifted object due to their respective gravity, in order to ensure the stability of the push chain and the top platform, a driving mechanism is provided to move synchronously and cooperate with the meshing push chain system 1. It can be understood that the above-mentioned "lateral forces applied to the push chain by the X-axis limiting mechanism, the Y-axis limiting mechanism, and the lifted object due to their respective gravity" are offset (partially or completely) through the control of the driving mechanism, thereby limiting the possibility of the push chain moving along the Y-axis. Combined with the limitation of the push chain movement along the X-axis by the folding arm structure, the stability of the push chain and the top platform can be guaranteed to the greatest extent.

[0070] Although the "steel column" formed by the push chain has sufficient rigidity, the above arrangement can achieve a more stable effect and avoid accidents. It can also avoid the above-mentioned "X-axial limit mechanism, Y-axial limit mechanism, and lateral force applied to the push chain by the respective gravity of the lifted object" from being applied to the push chain for a long time, resulting in local excessive wear of the push chain itself and even a decrease in strength.

[0071] In the above embodiments, the meshing push chain system 1 can be driven by a first servo motor, and the driving mechanism can be driven by a second servo motor, wherein the above-mentioned synchronous movement and coordinated cooperation should be understood as: during the lifting and lowering process of the push chain, the speed of the second servo motor is set according to the speed at which the slider 2 moves on the linear guide rail 2 due to the follow-up, so that the slider 2 maintains the real-time limit in the Y-axis direction while following.

[0072] Working principle of the present invention:

[0073] (1) The lifting platform uses a meshing push chain system 1 as a driving unit. The push chain is composed of two meshing chains. A single chain is flexible. Driven by the sprocket, the two chains mesh into a rigid "steel column"; see patent CN220131061U for details. A meshing push chain system.

[0074] (2) The top of the push chain is connected to the top platform and acts on the object being lifted; in order to ensure the stability of the push chain and the top platform, an X-axis limit mechanism and a Y-axis limit mechanism are set.

[0075] (3) The X-axis limiting mechanism has a first parallelogram structure and a second parallelogram structure that are mirror-arranged. The first parallelogram structure and the second parallelogram structure constitute a folding arm structure. Driven by the push chain, the folding arm structure realizes the lifting and lowering of the top platform by opening and closing. On the one hand, it assists the stability of the top platform, and on the other hand, it also limits the bending of the push chain along the X-axis, thereby improving the stability of the push chain.

[0076] (4) The Y-axis limit mechanism can limit the displacement of the top platform caused by the Y-axis bending of the push chain through a positioning bolt or a driving mechanism, further ensuring the stability of the push chain and the top platform;

[0077] (5) The meshing push chain system is driven by the first servo motor, which can control the extension distance and speed of the push chain and realize the start and stop of the lifting platform at any position; at the same time, the follow-up drive mechanism is driven by the second servo motor, which can realize the real-time limit of the Y-axis direction of the push chain.

[0078] It should be noted that the lifting platforms of the present invention can be used symmetrically or in combination, and multiple platforms (2, 4, etc.) can be linked to lift one or more objects at the same time. For example:

[0079] refer to Figure 2 ,exist Figure 2 Another lifting platform is set up in a mirror image on the left side of the lifting platform shown. The top platforms of the two lifting platforms are connected together, and the top platforms connected as one are synchronously driven to rise or fall through two sets of meshing push chain systems 1. At this time, the structure has good stability, and the driving mechanisms on both sides can be removed or the Y-axis limit mechanisms of the two lifting platforms can be directly removed.

[0080] Similarly, it can be understood that four lifting platforms can be used in combination. The four lifting platforms are respectively located on the front, back, left and right sides, and the relative lifting platforms are symmetrically arranged. The four top platforms are connected and fixed together or not connected together, and can be used to jointly lift one or more objects. At this time, since the structure has good symmetry, there is no need to use a Y-axis limit mechanism.

Claims

1. A foldable push chain lifting platform, characterized by: It includes a meshing push chain system, an X-axis limiting mechanism, and a Y-axis limiting mechanism. One side of the bottom of the meshing push chain system is fixedly connected to a base. The meshing push chain system outputs the push chain upward along the Z axis. The top of the push chain is fixedly connected to a top platform for carrying the lifted object. An X-axis limiting mechanism is also connected between the top platform and the base. A Y-axis limiting mechanism is connected to a side of the X-axis limiting mechanism away from the meshing push chain system. The X-axis limiting mechanism is a folding arm structure that only rotates around the X axis and limits the push chain and the top platform from moving along the X axis. A Y-axis limiting mechanism is connected between the outer side of the hinge of the folding arm structure and the ground.

2. A foldable push chain lifting platform as claimed in claim 1, characterized in that: The folding arm structure includes an articulated seat, which is a U-shaped plate structure with an open end facing one side of the push chain, the inner and outer sides of the top and bottom ends of the articulated seat are respectively provided with a first articulated axis arranged along the X-axis direction, the inner and outer sides of the bottom of the top platform are respectively provided with a second articulated axis along the X-axis direction, an inner support arm 1 is connected between the first articulated axis on the inner side of the top of the articulated seat and the second articulated axis on the inner side of the bottom of the top platform, and an outer support arm 1 is connected between the first articulated axis on the outer side of the top of the articulated seat and the second articulated axis on the outer side of the bottom of the top platform; the inner and outer sides of the upper end of the base are respectively provided with a third articulated axis along the X-axis direction, an inner support arm 2 is connected between the third articulated axis on the inner side of the base and the first articulated axis on the inner side of the bottom of the articulated seat, and an outer support arm 2 is connected between the third articulated axis on the outer side of the base and the first articulated axis on the outer side of the bottom of the articulated seat.

3. A foldable push chain lifting platform as claimed in claim 2, characterized in that: The connecting line of the first hinge axis and the second hinge axis at both ends of the inner support arm 1 and the outer support arm 1 constitutes a first parallelogram structure; the connecting line of the first hinge axis and the third hinge axis at both ends of the inner support arm 2 and the outer support arm 2 constitutes a second parallelogram structure, the first parallelogram structure and the second parallelogram structure are mirror-imaged about the horizontal center plane of the articulated seat, the bottom of the meshing push chain system is fixedly connected to the front end of the base, and the top of the push chain is fixedly connected to the front end of the top platform.

4. A foldable push chain lifting platform as claimed in claim 3, characterized in that: A linear guide rail is provided in the middle of the inner surface of the two side walls of the articulated seat along the Y-axis direction, a bearing seat is connected to the linear guide rail through a slider, a bearing is embedded in the bearing seat, the inner ring of the bearing is interference fit with a rotating shaft arranged along the X-axis direction, a rotating shaft 2 is provided in the middle of the inner support arm 1 along the X-axis direction, a rotating shaft 3 is provided in the middle of the inner support arm 2 along the X-axis direction, an upper pull rod is connected between one rotating shaft 1 and the rotating shaft 2, a lower pull rod is connected between the other rotating shaft 1 and the rotating shaft 3, and the upper pull rod and the lower pull rod have the same angle with the horizontal center plane of the articulated seat.

5. A foldable push chain lifting platform as claimed in claim 4, characterized in that: The Y-axis limiting mechanism includes a linear guide rail 2 fixed on the ground along the Y-axis direction and a side pull rod. The linear guide rail 2 is slidably connected with a slider 2, the top of the slider 2 is fixedly connected with a bearing seat 2, the top of the bearing seat 2 is rotatably connected with a rotating shaft 4 along the X-axis, the rotating shaft 4 is rotatably connected to the bottom of the side pull rod, the top of the side pull rod is also rotatably connected with a mounting seat, and the mounting seat is fixedly connected to the back of the hinge seat.

6. A foldable push chain lifting platform as claimed in claim 5, characterized in that: The slider 2 is provided with a locking mechanism for fixing it to the linear guide rail 2. The locking mechanism is a positioning bolt that passes through the slider 2 and is threadedly connected to the slider 2, or a driving mechanism that is connected to the slider 2 and drives the slider 2 to move along the linear guide rail 2. The driving mechanism is driven by a motor, and when the motor stops and is locked, the slider 2 and the linear guide rail 2 are relatively fixed.

7. A method for using a foldable push chain lifting platform as claimed in claim 6, characterized in that: The steps include: (1) The push chain contracts, and at the same time, driven by the driving mechanism, the slider 2 moves synchronously along the linear guide rail 2 toward the side away from the base until the top platform reaches the required height; (2) Place the object to be lifted on the top platform, start the meshing push chain system and drive mechanism, and lift the object to the required height.

8. A method for using a foldable push chain lifting platform as claimed in claim 7, characterized in that: In the steps (1) and (2), the driving mechanism only plays the role of limiting the Y-axis direction. Specifically, the driving mechanism is set so that the distance moved by the slider 2 on the linear guide rail matches the length of the extension or shortening of the push chain during the lifting or lowering of the push chain. At this time, the top platform is always in a horizontal state, and the Y-axis force on the push chain is minimized, thereby achieving Y-axis limiting.

9. A method for using a foldable push chain lifting platform as claimed in claim 7, characterized in that: In the steps (1) and (2), the folding arm structure only rotates around the X-axis direction, and while assisting the lifting of the top platform, it limits the movement of the push chain along the X-axis direction, thereby limiting the position of the push chain in the X-axis direction.

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