A stowed platform

Abstract

The present application relates to a kind of platform, including platform and mobile assembly arranged symmetrically in opposite inner side wall of platform, also including mobile assembly, folding component, self-locking assembly, locking piece;Folding component is hinged to the front end of mobile assembly, and is configured to be unfolded by being turned outwards relative to mobile assembly, and be folded by being turned inwards and be stored;Self-locking assembly is fixed in the internal cavity of mobile assembly, and self-locking assembly is close to the cavity mouth at the front end of mobile assembly, and locking area a adapted with locking piece is formed in self-locking assembly;Locking piece is installed in the rear end of folding component, and locking piece has locking end;When locking piece rotates clockwise, locking end extends into the interior of mobile assembly, and is clamped into locking area a, and the contact support point of locking end is formed by a1 and a2 surface set in locking area a together with a1 and a2 surface set in locking area a together with a1 and a2 surface set in locking area a together with a1 and a2 surface set in locking area a. The present application solves the problem that existing box truck / movable box body loading and unloading folding guide rail platform needs to be reinforced by adding inclined bracing under folding section, which occupies the loading width of carriage / box, and the docking of folding section and fixed section needs manual disassembly and assembly of bolt locking, which is complicated.

Description

Technical Field

[0001] This invention relates to the field of deployment and retraction platform technology, specifically a deployment and retraction platform. Background Technology

[0002] In scenarios involving loading and unloading goods from box trucks and mobile box-type equipment, to reduce manual handling intensity and improve loading and unloading efficiency, guide rails are typically installed inside the truck bed / mobile box-type equipment, along with a mobile crane. The crane moves back and forth along the guide rails to transfer goods into the truck bed. To further extend the working stroke of the mobile crane and accommodate goods and equipment of different sizes, existing technologies often employ foldable guide rail structures, extending the overall length of the guide rail by unfolding the folding section outwards.

[0003] However, the existing folding guide rail structure has the following drawbacks in practical applications: First, the load-bearing rigidity of the unfolded guide rail section is insufficient. During lifting operations, it is usually necessary to add diagonal braces below the folding section and connect them to the floor of the carriage to strengthen the structural support. These diagonal braces occupy the lateral space inside the carriage, compressing the effective loading width. When loading and unloading long goods or equipment, the use is easily restricted by the space inside the carriage, resulting in obvious limitations.

[0004] Secondly, the connection and locking between the unfolded folding section and the fixed section guide rail is generally achieved by using an external fixing plate and bolts. This requires manual installation of bolts one by one to complete the locking, and manual disassembly is also required during storage. The operation process is cumbersome, the work efficiency is low, and the external connectors are prone to being bumped or lost, resulting in poor reliability.

[0005] Therefore, there is an urgent need in the field for a retractable platform that can ensure the load-bearing capacity of the folded section without the need for additional diagonal bracing and can automatically lock after unfolding, in order to solve the above-mentioned problems existing in the prior art. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a retractable platform that solves the problems of existing folding guide rail platforms for loading and unloading box trucks and mobile box equipment requiring additional diagonal braces for reinforcement under the folding section, which occupies the loading width of the truck bed, and the cumbersome operation of manually disassembling and tightening bolts to connect the folding section and the fixed section.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a retractable platform, comprising a platform and a movable assembly symmetrically arranged on opposite inner sidewalls of the platform, and further comprising the movable assembly, a folding component, a self-locking assembly, and a locking component; The folding component is hinged to the front end of the moving assembly and is configured to be able to flip outward and unfold relative to the moving assembly and fold inward for storage. The self-locking assembly is fixed in the internal cavity of the moving assembly, and the self-locking assembly is located near the front cavity opening of the moving assembly. A locking area a is formed inside the self-locking assembly that is adapted to the locking element. The locking element is installed at the rear end of the folding component and has a locking end. When the locking element rotates clockwise, the locking end extends into the interior of the moving assembly and engages in the locking area a. The a1 and a2 surfaces provided in the locking area a together form a contact support point for the locking end.

[0008] Furthermore, the self-locking assembly includes a connector and a self-locking component. The surface of the connector has an opening for the locking end to enter. The self-locking component includes several connecting shafts movably mounted on the connector. One set of connecting shafts has an upper connecting tail seat mounted on its surface, and another set of connecting shafts has a lower connecting tail seat mounted on its surface. The outer end of the upper connecting tail seat is connected to a clamping head, and the outer end of the lower connecting tail seat is connected to a counter-head.

[0009] Furthermore, both the outer end face of the clamping head and the outer end face of the counterhead are provided with inclined surfaces, and the right side face of the clamping head is a, which is set in an arc shape, and the lower part of the arc surface is a plane, which together with the opening of the connector forms a locking area a. The connector includes a mounting plate installed in the inner cavity of the platform. A positioning plate is symmetrically fixed on the outer side of the mounting plate. Several openings are made on the positioning plate, and bearings are embedded in the openings. A connecting shaft is connected between two corresponding sets of bearings. An opening is made on the surface of the positioning plate.

[0010] As a preferred technical solution, the width of the opening is consistent with the diameter of the locking end, and the a-side of the opening is in contact with the locking end.

[0011] Furthermore, a transmission component is provided on the surface of several of the connecting shafts. The transmission component includes a second gear and a first gear disposed on the surface of the corresponding connecting shaft, and the first gear and the second gear constitute a meshing transmission.

[0012] As a preferred technical solution, the front and rear sides of the lower connecting tailstock are equipped with convex shafts, and a tension spring is sleeved between the convex shafts and the connecting shaft closest to the convex shafts.

[0013] Furthermore, the mobile assembly includes a mounting frame 1 symmetrically arranged on opposite inner sidewalls of the platform. A guide rail is mounted on the mounting frame 1, and a mobile crane is movably mounted on the guide rail. A mounting plate is connected to the inner sidewall of the mounting frame 1. A folding component is mounted on the front end of the mounting frame 1 via a 90-degree limiting hinge. Openings are also provided on the upper and lower surfaces of the mounting frame 1.

[0014] As a preferred technical solution, the lower end face of the top head is connected to an unlocking part, the surface of the unlocking part is provided with an opening, and the unlocking part and the clamping head are correspondingly arranged with the openings provided on the upper and lower surfaces of the mounting bracket.

[0015] Furthermore, the folding component includes a second mounting bracket connected to a 90-degree limiting hinge. The second mounting bracket is also equipped with a guide rail. The rear end of the second mounting bracket is equipped with a locking end, which includes a fixing plate fixedly mounted on the second mounting bracket. A clamping post is fixedly mounted on the fixing plate. The clamping post can be rotated into the locking area a and can contact the surface of a.

[0016] As a preferred technical solution, a triangular plate is also provided on the rear end face of the fixing plate to improve the connection strength between the fixing plate and the second mounting bracket. Secondly, a triangular plate is also provided on the lower end face of the first mounting bracket to improve the connection strength between the first mounting bracket and the platform.

[0017] Compared with the prior art, the present invention provides a retraction platform, which has the following beneficial effects: 1. This solution integrates a self-locking assembly within the cavity of the mobile assembly. After the folding component is fully unfolded, its rear locking end engages with the locking area, forming a stable contact support through two support surfaces. This directly provides load-bearing constraint at the guide rail docking position, eliminating the need for additional diagonal braces for reinforcement below the folding section. This avoids diagonal braces occupying the lateral space of the cargo box, preserving the effective loading width inside the cargo box, and enabling the loading and unloading of longer-sized goods and equipment, thus broadening the equipment's applicability.

[0018] 2. During the outward unfolding and rotation of the folding component, the locking end extends directly into the locking area and locks in place, eliminating the need for manual installation of a fixing plate and fastening bolts. When folding away, simply pull down the unlocking part. Through the meshing of gears, the locking head rotates clockwise, thus engaging the locking end. This eliminates the need for repeated disassembly and reassembly of fasteners, significantly improving the efficiency of unfolding and folding the guide rail. It also avoids the problems of easily lost or damaged external connectors.

[0019] 3. The self-locking assembly is built into the internal cavity of the mobile assembly, with the front end face flush with the cavity opening. There are no exposed locking components, which not only does not occupy additional external installation space, but also protects the internal locking structure. It is suitable for the narrow installation environment inside the vehicle, and the overall layout is more compact and reasonable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the present invention; Figure 2 For the present invention Figure 1 AA sectional view; Figure 3 For the present invention Figure 1 A top-down view; Figure 4 This is a schematic diagram showing the location of the self-locking assembly of the present invention within the internal cavity of the mounting bracket two; Figure 5 This is a schematic diagram of the self-locking assembly of the present invention; Figure 6 For the present invention Figure 5 The diagram on the right; Figure 7 This is a schematic diagram of the locking end structure of the present invention; Figure 8 For the present invention Figure 5 A three-dimensional schematic diagram.

[0021] In the diagram: 1. Platform; 2. Mounting bracket one; 3. 90-degree limiting hinge; 4. Mounting bracket two; 5. Mobile crane; 6. Self-locking assembly; 601. Mounting plate; 602. Positioning plate; 603. Bearing; 604. Connecting shaft; 605. Upper connecting tailstock; 606. Clamping head; 607. Gear one; 608. Gear two; 609. Lower connecting tailstock; 610. Alignment head; 611. Unlocking part; 612. Protruding shaft; 613. Tension spring; 7. Guide rail; 8. Fixing plate; 9. Clamping column; 10. Opening. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example Please see Figure 1-8 The present invention provides the following technical solution: a retractable platform, including a platform 1 and a movable assembly symmetrically arranged on opposite inner sidewalls of the platform 1, and further including the movable assembly, a folding component, a self-locking assembly 6, and a locking component; The folding component is hinged to the front end of the moving assembly and is configured to be able to flip outward and unfold relative to the moving assembly and fold inward for storage. The self-locking assembly 6 is fixed in the internal cavity of the movable assembly, and the self-locking assembly 6 is located near the front cavity opening of the movable assembly. A locking area a is formed in the self-locking assembly 6 that is adapted to the locking member. The locking element is installed at the rear end of the folding component and has a locking end. When the locking element rotates clockwise, the locking end extends into the interior of the moving assembly and engages in the locking area a. The a1 and a2 surfaces provided in the locking area a together form a contact support point for the locking end.

[0024] The folding component unfolds by rotating clockwise, causing its locking end to rotate synchronously. During rotation, the locking end gradually enters the cavity of the moving assembly and finally contacts the self-locking assembly 6, locking into the locking area a. Because the rear end of the folding component is in contact with the front end of the moving assembly during rotation, the locking end is locked via surface a1, preventing the folding component from rotating back. This eliminates the cumbersome manual fixing method. Furthermore, the locking end is supported by two surfaces a2, eliminating the need for existing diagonal braces. Although the diagonal braces provide sufficient support strength, the locking and support relationship between the locking end and the self-locking assembly 6 used in this solution also provides strong end support for the folding component. This ensures that the width of the cargo box remains the original width, preventing disruption to handling of longer goods or equipment. Furthermore, the weight of objects lifted by the moving assembly is not excessive, preventing bending of the locking end or deformation of the internal structure of the self-locking assembly 6. The locking end engages with the folding component as the folding component rotates, simultaneously supporting the locking end through the two surfaces a2. This solves the problems of existing folding guide rail platforms for loading and unloading trucks requiring additional diagonal braces for reinforcement below the folding section, which occupies the cargo box's loading width, and the cumbersome manual bolt locking operation required for connecting the folding and fixed sections.

[0025] For details regarding its self-locking assembly 6, please refer to the above. Figure 2 , Figure 4-8 As shown, the self-locking assembly 6 includes a connector and a self-locking component. The surface of the connector has an opening for the locking end to enter. The self-locking component includes several connecting shafts 604 movably mounted on the connector. One set of connecting shafts 604 has an upper connecting tailstock 605 mounted on its surface, and another set has a lower connecting tailstock 609 mounted on its surface. The outer end of the upper connecting tailstock 605 is connected to a locking head 606, and the outer end of the lower connecting tailstock 609 is connected to a mating head 610. When the locking end gradually enters through the rotation of the folding component... After the moving assembly cavity is reached, it first contacts the left inclined surface of the locking head 606. At this time, the locking head 606 will gradually rotate clockwise under the continuous thrust, thus creating an opening to facilitate the locking end entering the self-locking area a. When the folding part has rotated 90°, the locking head 606 falls back, and its a1 surface contacts the locking end. At the same time, the two a2 surfaces in the connector also contact the surface of the locking end. The a1 surface prevents the locking end from rotating back to complete the locking, and the a2 surface bears the weight Q of the locking end (see reference). Figure 5 As shown in the figure, at this time, the rear end of the folding component and the front end of the moving assembly are in a close fit state, and the limiting state is completed, so that the self-locking assembly can support the locking end while self-locking.

[0026] For details on facilitating the locking end's entry into the self-locking area a, please refer to [link / reference needed]. Figure 4 and Figure 5As shown, both the outer end face of the clamping head 606 and the outer end face of the counterhead 610 are provided with inclined surfaces, and the right side of the clamping head 606 is a1, which is set in an arc shape, and the lower part of the arc surface is a plane, which together with the opening of the connector forms a locking area a. For details, please refer to [link / reference]. Figure 4-8 As shown, the connector includes a mounting plate 601 installed in the inner cavity of platform 1. A locking plate 602 is symmetrically fixed on the outer side of the mounting plate 601. Several openings are provided on the locking plate 602, and bearings 603 are embedded in the openings to facilitate the rotation of the connecting shaft 604. A connecting shaft 604 that provides installation position for the upper and lower connecting tail seats is connected between the corresponding two sets of bearings 603. An opening is provided on the surface of the locking plate 602. Through the cooperation between the connecting shaft 604 and the bearings 603, the locking head 606 can adaptively rotate along the axial direction of the connecting shaft 604 after being pushed by the locking end, so as to lock the locking end in the future.

[0027] See Figure 5 As shown, the width of the opening is the same as the diameter of the locking end, and the a2 surface of the opening contacts the locking end. When the locking end enters the opening, the chamfer at the opening guides the locking end to smoothly enter the opening, completing the subsequent self-locking and support.

[0028] For a detailed explanation of the connection between the upper and lower connecting tailpieces, please refer to [link / reference needed]. Figure 8 As shown, the surfaces of several connecting shafts 604 are also provided with transmission components. These transmission components include a second gear 608 and a first gear 607 disposed on the surfaces of the corresponding connecting shafts 604. The first gear 607 and the second gear 608 form a meshing transmission. Through the meshing transmission relationship between the first gear 607 and the second gear 608, when the locking end enters the self-locking area a, the locking head 606 is subjected to force and rotates clockwise. At this time, the top head 610 rotates counterclockwise, which is to prepare for the subsequent release of the self-locking state.

[0029] To ensure that the clamping head 606 and the opposing head 610 are in contact in the initial state, please refer to [the relevant documentation]. Figure 8 As shown, a convex shaft 612 is installed on both the front and rear sides of the lower connecting tailstock 609. A tension spring 613 is sleeved between the convex shaft 612 and the connecting shaft 604 closest to the convex shaft 612. Through the tension force of the tension spring 613, it continuously pulls the top head 610 upward. At this time, through the meshing transmission relationship between gear one 607 and gear two 608, the clamping head 608 and the top head 610 are in contact, which facilitates subsequent reset.

[0030] See Figure 1-4As shown, the mobile assembly includes a mounting frame 2 symmetrically arranged on opposite inner sidewalls of the platform 1. A guide rail 7 is mounted on the mounting frame 2, and a mobile crane 5 is movably mounted on the guide rail 7. A mounting plate 601 is connected to the inner sidewall of the mounting frame 2. A folding component is mounted on the front end of the mounting frame 2 through a 90-degree limiting hinge 3. Openings 10 are also provided on the upper and lower surfaces of the mounting frame 2.

[0031] To facilitate subsequent unlocking and storage of the folded components, please refer to the diagram for details. Figure 5 , Figure 6 , Figure 8 As shown, the lower end face of the top head 610 is connected to an unlocking part 611. An opening is provided on the surface of the unlocking part 611. By simply pulling the unlocking part 611, and through the meshing transmission relationship between gears one and two, the locking head 606 can release its limiting clamping of the locking end. To provide sufficient space for the rotation of the top head 610, the locking head 606, and the unlocking part 611, please refer to [the relevant documentation]. Figure 1-4 As shown, the unlocking part 611 and the locking head 606 are correspondingly provided with the openings 10 opened on the upper and lower surfaces of the mounting bracket 2.

[0032] See Figure 1-3 As shown, the folding component includes a mounting bracket 2 4 connected to the 90-degree limiting hinge 3. The mounting bracket 2 4 also has a guide rail 7 mounted on it. A locking end is mounted at the rear end of the mounting bracket 2 4. (See reference...) Figure 7 As shown, its locking end includes a fixing plate 8 fixedly installed on the mounting bracket 4, and a clamping post 9 is fixedly installed on the fixing plate 8. The clamping post 9 can be rotated into the locking area a and can contact the surfaces a1 and a2.

[0033] See Figure 1 , Figure 2 , Figure 7 As shown, a triangular plate is also provided on the rear end face of the fixing plate 8 to improve the connection strength between the fixing plate 8 and the mounting bracket 2 4. Similarly, a triangular plate is also provided on the lower end face of the mounting bracket 2 to improve the connection strength between the mounting bracket 2 and the platform 1.

[0034] Working principle: After the folding component is fully unfolded, its rear locking pin 9 engages with the locking area of ​​the self-locking assembly 6. The vertical gravity load of the locking pin 9 is borne by the a2 surface at the opening of the locking plate 602, and the rotational freedom of the locking pin 9 is restricted by the a1 surface of the locking head 606. The self-weight of the folding section and the lifting load borne by the locking pin 9 are directly transmitted to the main structure of the mounting frame 2 through the two support points a1 and a2. This is a rigid bearing form of the docking end face, with a short bearing path and direct force. It can provide sufficient support rigidity and bending resistance for the folding component at the docking end. Therefore, there is no need to add an additional diagonal brace for bottom reinforcement under the folding component, which completely releases the lateral loading space inside the carriage and ensures that the original usable width of the carriage is not affected. The locking head 606 is mounted on the upper connecting shaft 604 through the upper connecting tail seat 605. Under the tension of the tension spring 613, it maintains a downward pressing tendency through gear meshing. When the locking pin 9 is fully engaged in the locking area, the a1 arc surface of the locking head 606 presses against the upper cylindrical surface of the locking pin 9. If the folding part tends to rotate inward, it will cause the locking pin 9 to apply a reverse thrust. This thrust, acting on the arc surface, will further intensify the clamping force of the locking head 606, forming a reverse self-locking effect. The greater the load on the folding section, the more secure the locking. This can effectively prevent the folding part from accidentally rotating and loosening during operation, without the need for additional locking fasteners. The upper and lower connecting shafts 604 form a synchronous reverse transmission relationship through the meshing gear 1 607 and gear 2 608. The lower tension spring 613 pulls down the connecting tailstock 609 through the cam shaft 612, and synchronously drives the upper locking head 606 to remain closed through gear transmission. When the locking pin 9 is pushed in, the locking heads and the counter-locking heads at both ends can be pushed open simultaneously. When unlocking, the unlocking part 611 can be moved to open both ends simultaneously, ensuring that the locking and unlocking actions are synchronized throughout the process without any one-sided jamming. At the same time, the spring tension is used to achieve automatic reset locking, without the need for additional manual locking steps.

[0035] Workflow: Before operation, the folded parts are flipped outwards. Mounting bracket 2 4 rotates clockwise around the 90-degree limiting hinge 3. The clamping pin 9 on the rear fixing plate 8 moves in an arc with the flipping action, gradually approaching the front cavity of mounting bracket 2. The clamping pin 9 first contacts the guide slope at the end of the clamping head 606 and the counterhead 610. As the flipping angle increases, the clamping pin 9 continues to advance along the slope, overcoming the tension of the tension spring 613, pushing the clamping head 606 upwards and the counterhead 610 downwards. The two rotate synchronously in opposite directions through gear transmission, making way for the clamping pin 9 to enter.

[0036] When the folding component is rotated to 90°, it stops rotating due to the limiting effect of the 90-degree limiting hinge 3. At this time, the end faces of mounting bracket 2 4 and mounting bracket 1 2 are in contact, and the two guide rails 7 are precisely aligned. The locking pin 9 is fully inserted into the opening of the locking plate 602 and falls into the locking area a. The tension spring 613 then pulls back to its original position, and through gear transmission, it drives the locking head 606 and the counter-head 610 to return to their original positions and close synchronously. The a1 surface of the locking head 606 presses against the upper cylindrical surface of the locking pin 9, preventing it from rotating. The a2 surface at the opening supports the lower cylindrical surface of the locking pin 9, bearing all the vertical load. This completes the automatic locking and load-bearing support. During the entire unfolding process, the locking action is completed synchronously with the flipping action, eliminating the need for manual installation of fixing plates and tightening bolts, greatly simplifying the operation steps. Moreover, the load-bearing support is provided by the end self-locking structure, without the bottom diagonal bracing occupying the space of the carriage, ensuring the complete loading width inside the carriage.

[0037] When the work is completed and storage is required, the operator uses the operating opening 10 on the lower surface of mounting bracket 2 to push down the unlocking part 611, causing the lower connecting tailstock 609 and the counterhead 610 to rotate downwards. Through the meshing transmission of gear 1 607 and gear 2 608, the upper connecting tailstock 605 simultaneously drives the clamping head 606 to rotate upwards, disengaging surface a1 from the surface of the clamping post 9 and releasing the rotation constraint. While maintaining the unlocked state, the folding part is flipped inwards, and the clamping post 9 rotates out of the locking area along with mounting bracket 2 4, completing the unlocking and separation. Continue flipping until the folding part is completely stored inside the platform to complete the storage operation. The entire process requires no disassembly of any external fasteners, and there is no issue of lost or damaged bolts, fixing plates, or other loose parts, making the storage operation convenient and efficient. Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Stacked components, self-locking assembly (6), locking components; The folding component is hinged to the front end of the moving assembly and is configured to be able to flip outward and unfold relative to the moving assembly and fold inward for storage. The self-locking assembly (6) is fixed in the internal cavity of the moving assembly, and the self-locking assembly (6) is close to the front cavity of the moving assembly. A locking area a adapted to the locking member is formed in the self-locking assembly (6); The locking element is installed at the rear end of the folding component and has a locking end. When the locking element rotates clockwise, the locking end extends into the interior of the moving assembly and engages in the locking area a. The a1 and a2 surfaces provided in the locking area a together form a contact support point for the locking end.

2. The retraction platform according to claim 1, characterized in that: The self-locking assembly (6) includes a connector and a self-locking component. The surface of the connector has an opening for the locking end to enter. The self-locking component includes several connecting shafts (604) movably mounted on the connector. One set of connecting shafts (604) has an upper connecting tail seat (605) mounted on its surface, and another set of connecting shafts (604) has a lower connecting tail seat (609) mounted on its surface. The outer end of the upper connecting tail seat (605) is connected to a clamping head (606), and the outer end of the lower connecting tail seat (609) is connected to a counter-head (610).

3. The retractable platform according to claim 2, characterized in that: The outer end face of the clamping head (606) and the outer end face of the counterhead (610) are both provided with inclined surfaces, and the right side of the clamping head (606) is a1, which is set in an arc surface, and the lower part of the arc surface is a plane, which forms a locking area a with the opening of the connector. The connector includes a mounting plate (601) installed in the inner cavity of the platform (1). A positioning plate (602) is symmetrically fixed on the outer side of the mounting plate (601). Several openings are provided on the positioning plate (602), and bearings (603) are embedded in the openings. A connecting shaft (604) is connected between two corresponding sets of bearings (603). An opening is provided on the surface of the positioning plate (602).

4. The retraction platform according to claim 3, characterized in that: The width of the opening is the same as the diameter of the locking end, and the a2 surface of the opening is in contact with the locking end.

5. A retractable platform according to claim 2, characterized in that: The surfaces of some of the connecting shafts (604) are also provided with transmission components, which include gear two (608) and gear one (607) disposed on the surfaces of the corresponding connecting shafts (604), and gear one (607) and gear two (608) form a meshing transmission.

6. A retractable platform according to claim 2, characterized in that: The lower connecting tailstock (609) is equipped with a cam (612) on both the front and rear sides, and a tension spring (613) is sleeved between the cam (612) and the connecting shaft (604) closest to the cam (612).

7. A retractable platform according to claim 1, characterized in that: The mobile assembly includes a mounting frame (2) symmetrically arranged on opposite inner sidewalls of the platform (1), a guide rail (7) is mounted on the mounting frame (2), a mobile crane (5) is movably mounted on the guide rail (7), a mounting plate (601) is connected to the inner sidewall of the mounting frame (2), a folding component is mounted on the front end of the mounting frame (2) through a ninety-degree limiting hinge (3), and openings (10) are also provided on the upper and lower surfaces of the mounting frame (2).

8. A retractable platform according to claim 2, characterized in that: The lower end face of the top head (610) is connected to an unlocking part (611), and the surface of the unlocking part (611) is provided with an opening. The unlocking part (611) and the clamping head (606) are correspondingly provided with the openings (10) on the upper and lower surfaces of the mounting bracket (2).

9. A retractable platform according to claim 7, characterized in that: The folding component includes a mounting bracket two (4) connected to a ninety-degree limiting hinge (3). A guide rail (7) is also installed on the mounting bracket two (4). A locking end is installed at the rear end of the mounting bracket two (4). The locking end includes a fixing plate (8) fixedly installed on the mounting bracket two (4). A clamping post (9) is fixedly installed on the fixing plate (8). The clamping post (9) can be rotated into the locking area a and can contact the surfaces a1 and a2.

10. A retractable platform according to claim 9, characterized in that: The rear end face of the fixing plate (8) is also provided with a triangular plate to improve the connection strength between the fixing plate (8) and the second mounting bracket (4). Secondly, the lower end face of the first mounting bracket (2) is also provided with a triangular plate to improve the connection strength between the first mounting bracket (2) and the platform (1).

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