Cover plate assembly can shorten the plastic plate feeding mechanism of idle stroke

Abstract

The application is a plastic plate feeding mechanism with shortened idle stroke of cover plate assembly, which comprises a tool plate, a positioning column arranged on the tool plate, and plastic plates sleeved on the positioning column in a stacking manner; the mechanism further comprises a driving assembly; when the plastic plates on the positioning column are in a full load state, the total weight of the plastic plates is greater than the driving force of the driving assembly; when the plastic plates are taken away one by one from the top, the driving assembly can drive the remaining plastic plates to rise by one step distance successively, and the step distance is equal to the thickness of the plastic plates; the plastic plates can move away from the tool plate at any oblique upward angle, and then move vertically downward to an assembly station to be pressed and assembled with a metal cover plate. The remaining plastic plates are lifted by the driving assembly, so that the lower end surface of the uppermost plastic plate is flush with or higher than the upper end surface of the positioning column, and a mechanical hand can directly grab and transfer at an oblique upward angle, eliminating the vertical rising section, simplifying the movement track into two paths of oblique removal and vertical descent, and significantly shortening the single taking and placing idle stroke path.

Description

Technical Field

[0001] This invention relates to the technical field of battery cover plate loading mechanisms, specifically a plastic plate loading mechanism for cover plate assemblies that can shorten the empty stroke. Background Technology

[0002] In the manufacturing process of battery modules, battery cover assemblies are typically made of a composite structure of a metal cover and a plastic sheet. In existing assembly processes, the plastic sheets are first stacked in batches on a special tooling, and then a robotic arm picks up the plastic sheets one by one using vacuum adsorption and transfers them to the assembly station with the metal cover for pressing and assembly.

[0003] However, since the plastic sheet is typically mounted on the positioning post in a nested manner on the tooling for accurate positioning, the robotic arm must sequentially execute a multi-stage motion trajectory—vertically rising to detach from the positioning post, moving horizontally, and then vertically descending to the assembly position—to avoid interference with the positioning post when picking up the plastic sheet. This setup results in a long travel distance, significantly increasing the time required for a single pick-and-place cycle, leading to low assembly efficiency of the battery cover.

[0004] Therefore, there is an urgent need for a battery cover assembly solution that can optimize the pick-and-place path, shorten the transfer time, and improve assembly efficiency. Summary of the Invention

[0005] To address the technical problems in the background art, the present invention discloses a plastic sheet loading mechanism with a cover plate assembly that can shorten the empty stroke.

[0006] The present invention provides a plastic sheet loading mechanism with a cover plate assembly that can shorten the idle time, including a tooling plate and a robot arm. The tooling plate is provided with two positioning posts, and the plastic sheets are stacked and sleeved on the positioning posts. It also includes a drive assembly. When the plastic plate on the positioning column is fully loaded, the total weight of the plastic plate is greater than the driving force of the drive assembly. As the plastic sheets are removed one by one from the top, the drive assembly can drive the remaining plastic sheets to rise one step at a time, the step being equal to the thickness of the plastic sheet. The lower end face of the top plastic plate is flush with or higher than the upper end face of the positioning post, and the remaining plastic plates are all fitted onto the positioning post. The top of the positioning column is also equipped with a liftable positioning component, which is used to limit the plastic plate located at the top. The robotic arm's drive end is equipped with a suction cup and a pressure block. Before the suction cup first picks up the plastic sheet, the pressure block drives the positioning component to move down so that the positioning component is detached from the top plastic sheet, thereby allowing the plastic sheet to move at any angle upward to detach from the tooling plate. Then, it moves vertically down to the assembly station to press and assemble with the metal cover plate.

[0007] Furthermore, the positioning component includes a limiting plate, and a connecting rod is provided on the lower side of the limiting plate; the connecting rod is inserted into the top of the positioning post and is held at any height position on the top of the positioning post by friction.

[0008] Furthermore, a support plate is provided at the bottom of the positioning post, and a socket hole is provided on the support plate for the positioning post to pass through; The drive assembly includes a spring-loaded coil spring, the drive end of which is connected to the pallet via a wire rope, and is used to drive the pallet to rise through a winding action.

[0009] Furthermore, the outer wall of the positioning post is provided with stepped slots, and the distance between adjacent slots is equal to the thickness of the plastic sheet. The tray is equipped with a locking rod, which is elastically connected to the tray by a spring. The snap-fit ​​rod extends from the wall of the socket into the hole and snaps into the slot, generating friction between itself and the wall of the slot. As the locking rod moves upward and engages with the slots at different heights, the compression of the spring increases, causing the friction between the locking rod and the slot to increase accordingly. The sum of the total weight of the plastic sheet supported on the positioning post, the weight of the pallet, and the frictional force between the locking rod and the slot is greater than the winding force of the spring-loaded coil spring, and the difference between this sum and the winding force is less than the weight of a single plastic sheet.

[0010] Furthermore, the lower wall of the slot is set horizontally, while the upper wall extends obliquely upward; When the top plastic sheet is removed, the upper wall of the slot guides the locking rod, causing the locking rod to automatically engage with the upper slot.

[0011] Furthermore, the radial sidewall of the positioning post is provided with an axially extending limiting groove, and the slot is provided in the limiting groove; The locking rod achieves horizontal constraint through the limiting groove; The portion between adjacent slots forms a tooth; in the axial projection of the positioning post, the tooth is located within the projection range and is spaced from the edge of the projection.

[0012] Furthermore, the tray is provided with a plug hole that communicates with the socket hole, and the locking rod and spring are both located in the plug hole; The locking lever can remain in the retracted state after it disengages from the slot and retracts into the insertion hole, thanks to the locking mechanism.

[0013] Furthermore, the locking structure includes a threaded hole located at the outer end of the insertion hole and a threaded sleeve that is threadedly connected to the threaded hole; The spring is positioned between the snap-fit ​​rod and the threaded sleeve; The outer end of the snap-fit ​​rod is provided with a reduced-diameter screw; when the snap-fit ​​rod is retracted into the insertion hole, the screw is threadedly connected to the threaded sleeve to lock the snap-fit ​​rod.

[0014] Furthermore, a reduced-diameter pull rod is extended from the end of the screw away from the snap-fit ​​rod; The pull rod extends out of the support plate and is used to drive the snap-fit ​​rod to retract into the insertion hole, as well as to drive the reduced-diameter screw rod to connect with the threaded sleeve.

[0015] Furthermore, the outer radial side of the positioning post is provided with an axially extending axial groove, and the top is provided with a radial groove. One end of the radial groove is connected to the axial groove, and the other end is connected to the inner hole of the positioning post. A spring-loaded coil is installed on the lower side of the inner cavity of the positioning post; The wire rope portion is housed within the cavity of the positioning column, while the remaining portion is housed within the axial and radial grooves. The connection between the wire rope and the pallet is located within the axial projection range of the axial groove.

[0016] The beneficial effects of this invention are: 1. This invention uses a drive component to lift the remaining plastic sheet, making the lower end of the uppermost plastic sheet flush with or higher than the upper end of the positioning post. After the lifting positioning component releases the limit, the robot can directly grab and transfer the plastic sheet at an upward angle, eliminating the vertical upward segment and simplifying the movement trajectory into two paths: an oblique movement out and a vertical descent. This significantly shortens the empty path for a single pick-up and drop, thereby reducing the transfer time of the plastic sheet and improving the assembly efficiency of the battery cover.

[0017] 2. This invention achieves passive adaptive feeding by ensuring that the total weight of the plastic sheets on the positioning column is greater than the driving force of the drive assembly when the plastic sheets are fully loaded. As the plastic sheets are removed one by one from the top, the drive assembly can drive the remaining plastic sheets to rise one step at a time, with the step distance equal to the thickness of the plastic sheet. Regardless of the number of plastic sheets remaining on the tooling plate, the topmost plastic sheet to be grasped is always lifted to a preset fixed height. This keeps the grasping coordinates of the robot arm constant, eliminating the need to adjust the vertical parameters of the robot arm in real time according to the variable height of the plastic sheet to be grasped, thus simplifying the control logic.

[0018] 3. The adjustable positioning component limits the top plastic sheet when not in the material handling state, preventing misalignment or falling during the transfer of a fully loaded plastic sheet to the loading station, ensuring neat loading. Before the suction cup picks up the plastic sheet, the pressure block drives the positioning component downwards to disengage, clearing obstacles for the oblique movement of the plastic sheet. This avoids damage or jamming caused by forced pulling and ensures the freedom of movement of the robotic arm. Furthermore, during the subsequent gripping process, the plastic sheet rises under the action of the drive assembly without interference. Therefore, even without the limiting effect of the positioning component, the top plastic sheet can still accurately rise to the set position. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the hidden grasping device of the present invention; Figure 3 yes Figure 2 Sectional view of AA; Figure 4 yes Figure 3 An enlarged view of point C shows the limiting component in a position where it is engaged with the top plastic plate. Figure 5 yes Figure 3 Enlarged view of point C, showing the limiting component in a descending, detached state from the top plastic plate; Figure 6 yes Figure 2 Sectional view of BB; Figure 7 yes Figure 6 Enlarged view of point D in the middle; Figure 8 This is a structural diagram of the positioning column; Figure 9 This is the front sectional view of the positioning post; Figure 10 This is a structural schematic diagram of the positioning component; Figure 11 This is a schematic diagram of the connection structure of the spring-loaded coil, wire rope, and support plate. In the diagram: 1. Tooling plate; 2. Positioning post; 3. Plastic plate; 4. Suction cup; 5. Pressure block; 6. Limiting plate; 7. Support plate; 8. Spring-loaded coil spring; 9. Steel wire rope; 10. Spring; 11. Fixing bracket; 21. Slot; 22. Limiting slot; 23. Slot tooth; 24. Axial slide groove; 25. Radial slide groove; 61. Insert rod; 71. Sleeve hole; 72. Clip rod; 73. Insert hole; 74. Screw sleeve; 75. Screw; 76. Pull rod. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0022] like Figure 1 and Figure 2 As shown, this invention discloses a battery plastic sheet loading mechanism that can shorten the idle travel path, including a tooling plate 1 and a robotic arm. The tooling plate 1 is horizontally arranged, and its upper side is provided with multiple linear array loading stations. Each loading station is provided with two vertically extending, symmetrically arranged, and spaced-apart positioning posts 2. The plastic sheets 3 are stacked and sleeved on the positioning posts 2. Only one loading station is shown in this embodiment.

[0023] The bottom of the positioning post 2 is provided with a support plate 7, and the support plate 7 has a socket hole 71 for the positioning post 2 to pass through. The plastic plate 3 is stacked on the top of the support plate 7.

[0024] like Figure 11 As shown, the positioning post 2 is hollow in the axial direction, and a spring-type coil spring 8 is provided on the lower side of its inner cavity. One end of the steel wire rope 9 is fixedly connected to the telescopic end of the spring-type coil spring 8, and the other end passes around the top of the positioning post 2 to the outside of the positioning post 2 and is fixedly connected to the support plate 7. In this way, the support plate 7 can be driven to move upward under the winding action of the spring-type coil spring 8.

[0025] Because the steel wire rope 9 protrudes radially from the positioning post 2, it will obstruct the installation of the support plate 7 and the plastic plate 3. Therefore, Figure 8 and Figure 11 As shown, the outer radial side of the positioning post 2 is provided with an axially extending axial groove 24, and the top is provided with a radial groove 25. One end of the radial groove 25 communicates with the axial groove 24, and the other end communicates with the inner hole of the positioning post 2. The wire rope 9 is partially housed in the inner cavity of the positioning post, and the remaining part is housed in the axial groove 24 and the radial groove 25. Moreover, the connection between the wire rope 9 and the support plate 7 is located within the axial projection range of the axial groove 24.

[0026] like Figure 9 As shown, the outer wall of the positioning post 2 is provided with stepped grooves 21 that are spaced apart from the axial sliding groove 24. The distance between adjacent grooves 21 is equal to the thickness of the plastic plate 3, and the height of the bottom of the groove 21 increases from bottom to top in the radial direction of the positioning post 2.

[0027] like Figure 6 and Figure 7As shown, the support plate 7 has a horizontally arranged insertion hole 73 that extends through the width direction and communicates with the socket hole 71. A locking rod 72 and a spring 10 are installed in the insertion hole 73. A threaded sleeve 74 is provided at the outer end of the insertion hole 73. The two ends of the spring 10 abut against the locking rod 72 and the sleeve 74 respectively. Under the action of the spring force, the inner end of the locking rod 72 penetrates into the socket hole 71 and engages with the locking groove 21.

[0028] To improve the stability of the locking rod 72 engaging with the locking slot 21, the radial sidewall of the positioning post 2 is provided with an axially extending limiting groove 22. The locking slot 21 is located within the limiting groove 22, and the locking rod 72 is horizontally constrained by the limiting groove 22. Furthermore, the portion between adjacent locking slots 21 forms locking teeth 23; in the axial projection of the positioning post 2, the locking teeth 23 are located within the projection range, and a gap is provided between them and the edge of the projection. Thus, during the transfer process of the locking rod 72 engaging with different locking slots 21, it is always constrained by the limiting groove 22 and will not detach from the locking slot 21.

[0029] To facilitate the fitting of the tray 7 to the bottom of the positioning post 2, a reduced-diameter screw 75 is coaxially extended from the outer end of the locking rod 72, and a reduced-diameter pull rod 76 is coaxially extended from the outer end of the screw 75, extending to the outside of the tray 7. The locking rod 72 can be stretched by pinching the pull rod 76, causing it to disengage from the locking groove 21 and retract into the insertion hole 73. When the screw 75 abuts against the threaded sleeve 74, rotating the pull rod 76 will thread the screw 75 and the threaded sleeve 74 together, keeping the locking rod 72 retracted into the insertion hole 73.

[0030] When the locking rod 72 engages with the slot 21, the locking rod 72 is subjected to the elastic force of the spring 10, thereby creating friction between the locking rod 72 and the bottom of the slot 21. When the locking rod 72 engages with slots 21 at different heights, since the slots 21 are stepped, the compression of the spring 10 is greater and the elastic force is greater as it goes higher, resulting in greater friction between the locking rod 72 and the slot 21.

[0031] The lower wall of the slot 21 is horizontal, while the upper wall extends obliquely upward. The horizontally arranged lower wall limits the engagement rod 72 to improve its vertical positioning accuracy. The obliquely upward upper wall guides the engagement rod 72, causing it to automatically engage with the upper slot 21.

[0032] When the plastic plate 3 on the positioning post 2 is fully loaded, the sum of the total weight of the plastic plate 3, the weight of the support plate 7, and the frictional force is greater than the winding force of the spring-loaded coil 8, and the difference between this sum and the winding force is less than the weight of a single plastic plate 3. When the top plastic plate 3 is removed, the sum of the total weight of the remaining plastic plate 3, the weight of the support plate 7, and the frictional force is less than the winding force of the spring-loaded coil 8. The spring-loaded coil 8 drives the support plate 7 to rise one step, which is consistent with the thickness of the plastic plate 3. After the support plate 7 rises one step, the frictional force between the locking rod 72 and the locking groove 21 increases, restoring the state where the sum of the total weight of the plastic plate 3, the weight of the support plate 7, and the frictional force is greater than the winding force of the spring-loaded coil 8.

[0033] The above configuration allows the locking rod 72 drive assembly to raise the remaining plastic sheets 3 one step at a time as they are removed one by one from the top. This achieves passive adaptive feeding; regardless of the number of plastic sheets 3 remaining on the tooling plate 1, the topmost plastic sheet 3 to be gripped is always raised to a preset fixed height. This keeps the gripping coordinates of the robot arm constant, eliminating the need to adjust the robot arm's vertical parameters in real time based on the variable height of the plastic sheet 3 to be gripped, thus simplifying the control logic.

[0034] Moreover, the spring-loaded coil spring 8 itself requires no external electric or pneumatic power source, relying solely on its own elastic potential energy to provide driving force. This avoids complex electrical or pneumatic control systems, simplifies the overall mechanism, and reduces manufacturing costs and maintenance difficulty. Simultaneously, the tension provided by the spring-loaded coil spring 8 remains essentially constant during winding, ensuring uniform force distribution on the pallet 7 and stacked plastic plates 3 during ascent. Combined with the frictional design of the stepped slot 21 and the latching rod 72, after the top plastic plate 3 is removed, the combined force of the total weight of the remaining plastic plate 3 and the frictional force of the latching rod 72 is less than the coil spring's winding force. This forces the latching rod 72 to slide along the inclined upper slot wall into the next level slot 21, thereby enabling the plastic plate 3 to automatically and precisely rise one step, allowing the top plastic plate 3 to rise stably to the set height, enabling the robotic arm to stably pick up the part at an angle.

[0035] The lower end face of the top plastic plate 3 is flush with or higher than the upper end face of the positioning post 2, and the remaining plastic plates 3 are all fitted onto the positioning post 2. When the robotic arm drives the suction cup 4 to grab the top plastic plate 3, it can move upward at any angle to detach from the tooling plate 1, and then move vertically downward to the assembly station to press and assemble with the metal cover plate.

[0036] Because tooling plate 1 needs to be transferred between a preparation station and a loading station—the preparation station for mounting the plastic sheet 3 and the loading station for the robotic arm to grip the plastic sheet 3—the plastic sheet 3 on top of tooling plate 1 is unrestrained during the transfer from the preparation station to the loading station, making it prone to misalignment or even falling. Therefore, the top of the positioning column 2 is also equipped with a liftable positioning component to limit the movement of the plastic sheet 3 located at the top. Figure 10 As shown, the positioning component includes a limiting plate 6, and a connecting rod 61 is provided on the lower side of the limiting plate 6; the connecting rod 61 is inserted into the top of the positioning post 2 and is held at any height position on the top of the positioning post 2 by friction.

[0037] The robotic arm's drive end is equipped with a horizontally arranged mounting bracket 11. A vertically extending suction cup 4 and a pressure block 5 are located at the lower end of the mounting bracket 11, with the lower end of the pressure block 5 extending downwards beyond the suction cup 4. Before the suction cup 4 initially adsorbs the plastic sheet 3, the pressure block 5 first drives the positioning component downwards to detach it from the top of the plastic sheet 3. For example... Figure 3-5 As shown, the adjustable positioning component limits the top plastic plate 3 when not in the material handling state, preventing misalignment or falling during the transfer of a fully loaded plastic plate 3 from the tooling plate 1 to the loading station, thus ensuring the neatness of the loading. Before the suction cup 4 adsorbs, the pressure block 5 drives the positioning component to move down and detach from the top plastic plate 3, clearing obstacles for the oblique movement of the top plastic plate 3 in advance, thereby avoiding damage or jamming of the plastic plate 3 caused by forced pulling, and ensuring the freedom of the robot's movement trajectory. Moreover, during the subsequent gripping process, when the plastic plate 3 rises under the action of the drive component, the plastic plate 3 is not disturbed. Therefore, even without the limiting effect of the positioning component, the top plastic plate 3 can still accurately rise to the set position.

[0038] In summary, this invention uses a drive assembly to lift the remaining plastic sheet 3, making the lower end face of the uppermost plastic sheet 3 flush with or higher than the upper end face of the positioning post 2. After the lifting positioning component releases the limit, the robot arm can directly grasp and transfer the plastic sheet at an upward angle, eliminating the vertical upward segment and simplifying the movement trajectory into two paths: an oblique movement out and a vertical descent. This significantly shortens the empty path for a single pick-up and drop, thereby reducing the transfer time of the plastic sheet 3 and improving the assembly efficiency of the battery cover.

[0039] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A plastic sheet loading mechanism with a cover plate assembly that can shorten the idle stroke, comprising a tooling plate (1) and a robot arm, wherein two positioning posts (2) are provided on the tooling plate (1), and plastic sheets (3) are stacked and sleeved on the positioning posts (2); characterized in that: It also includes driver components; When the plastic plate (3) on the positioning column (2) is fully loaded, the total weight of the plastic plate (3) is greater than the driving force of the driving component; When the plastic sheets (3) are removed one by one from the top, the driving assembly can drive the remaining plastic sheets (3) to rise one step at a time, the step being equal to the thickness of the plastic sheets (3); The lower end face of the plastic plate (3) located at the top is flush with or higher than the upper end face of the positioning post (2), and the rest of the plastic plates (3) are all sleeved on the positioning post (2). The top of the positioning column (2) is also provided with a liftable positioning component, which is used to limit the plastic plate (3) located at the top; The drive end of the robotic arm is equipped with a suction cup (4) and a pressure block (5); before the suction cup (4) first adsorbs the plastic plate (3), the pressure block (5) first drives the positioning component to move down so that the positioning component is removed from the top plastic plate (3), so that the plastic plate (3) can move at any angle upward to remove itself from the tooling plate (1), and then move vertically down to the assembly station to press and assemble with the metal cover plate; The bottom of the positioning post (2) is provided with a support plate (7), and the support plate (7) is provided with a socket hole (71) for the positioning post (2) to pass through. The drive assembly includes a spring-loaded coil spring (8), the drive end of which is connected to the pallet (7) via a wire rope (9) and is used to drive the pallet (7) to rise by winding action. The outer wall of the positioning post (2) is provided with a stepped slot (21), and the distance between adjacent slots (21) is equal to the thickness of the plastic sheet (3). The tray (7) is provided with a snap-fit ​​rod (72), which is elastically connected to the tray (7) by a spring (10). The snap-fit ​​rod (72) extends from the wall of the socket (71) into the hole and snaps into the slot (21), and generates friction between itself and the wall of the slot (21). When the locking rod (72) moves upward and engages with the slots (21) at different heights, the compression of the spring (10) increases, causing the friction between the locking rod (72) and the slots (21) to increase accordingly. The sum of the total weight of the plastic sheet (3) carried on the positioning post (2), the weight of the support plate (7), and the friction between the snap-fit ​​rod (72) and the slot (21) is greater than the winding force of the spring-loaded coil spring (8), and the difference between the sum and the winding force is less than the weight of a plastic sheet (3).

2. The plastic sheet feeding mechanism with a shortened idle stroke according to claim 1, characterized in that: The positioning component includes a limiting plate (6), and a plug rod (61) is provided on the lower side of the limiting plate (6); the plug rod (61) is inserted into the top of the positioning post (2) and is held at any height position on the top of the positioning post (2) by friction.

3. The plastic sheet loading mechanism with a cover plate assembly that can shorten the idle stroke according to claim 1, characterized in that: The lower wall of the slot (21) is horizontally set, and the upper wall extends obliquely upward; When the plastic plate (3) at the top is removed, the upper groove wall of the slot (21) guides the locking rod (72), causing the locking rod (72) to automatically engage with the slot (21) above.

4. The plastic sheet loading mechanism with a shortened idle stroke according to claim 1, characterized in that: The radial sidewall of the positioning post (2) is provided with an axially extending limiting groove (22), and the slot (21) is provided in the limiting groove (22); The snap-fit ​​rod (72) achieves horizontal constraint through the limiting groove (22); The portion between adjacent slots (21) forms a tooth (23); in the axial projection of the positioning post (2), the tooth (23) is located within the projection range and is spaced apart from the edge of the projection.

5. The plastic sheet loading mechanism with a shortened idle stroke according to claim 1, characterized in that: The tray (7) is provided with a plug hole (73) communicating with the socket hole (71), and the snap rod (72) and the spring (10) are both provided in the plug hole (73); The locking rod (72) can remain in the retracted state under the action of the locking structure after it is disengaged from the slot (21) and retracted into the insertion hole (73).

6. The plastic sheet loading mechanism with a shortened idle stroke according to claim 5, characterized in that: The locking structure includes a threaded hole located at the outer end of the insertion hole (73) and a threaded sleeve (74) threadedly connected to the threaded hole. The spring (10) is disposed between the snap-fit ​​rod (72) and the threaded sleeve (74); The outer end of the snap-fit ​​rod (72) is provided with a reduced diameter screw (75); when the snap-fit ​​rod (72) is retracted into the insertion hole (73), the screw (75) is threadedly connected to the screw sleeve (74) to lock the snap-fit ​​rod (72).

7. The plastic sheet loading mechanism with a shortened idle stroke according to claim 6, characterized in that: A reduced-diameter pull rod (76) is also extended from the end of the screw (75) away from the snap-fit ​​rod (72); The pull rod (76) extends out of the support plate (7) to drive the snap-fit ​​rod (72) to retract into the insertion hole (73) and to drive the reduced diameter screw (75) to be threadedly connected to the screw sleeve (74).

8. The plastic sheet loading mechanism with a shortened idle stroke according to claim 1, characterized in that: The locating post (2) has an axially extending axial groove (24) on its radial outer side and a radial groove (25) on its top. One end of the radial groove (25) is connected to the axial groove (24), and the other end is connected to the inner hole of the locating post (2). The spring-loaded coil spring (8) is installed on the lower side of the inner cavity of the positioning post (2); The steel wire rope (9) is partially housed in the inner cavity of the positioning column (2), and the remaining part is housed in the axial groove (24) and the radial groove (25); The connection between the wire rope (9) and the support plate (7) is located within the axial projection range of the axial groove (24).

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