Steel plate feeding and discharging mechanism and hydraulic flat car comprising same

Abstract

The invention relates to the technical field of steel plate carrying, in particular to a steel plate feeding and discharging mechanism and a hydraulic flat car comprising the same, the steel plate feeding and discharging mechanism comprises a support, and further comprises a plurality of sliding grooves formed in the two sides of the support from top to bottom in a linear array mode; the two ends of the storage plate are movably arranged in the sliding grooves, and the interior of the storage plate is hollow; the steel plate is placed in the middle of the upper surface of the placement plate; the multiple notches are formed in the upper surface of the storage plate in a transverse linear array mode and communicate with the interior of the storage plate; the top plate is movably arranged in the notch and movably abuts against the bottom of the steel plate; and the jacking assembly is arranged in the storage plate and used for driving the top plate to move up and down. According to the steel plate feeding and discharging mechanism, the jacking assembly can drive the steel plate to move upwards by a small distance during discharging, the contact area between the bottom of the steel plate and the top plate is far smaller than the contact area between the bottom of the steel plate and the storage plate, and therefore a mechanical arm can more conveniently adsorb the steel plate.

Description

Technical Field

[0001] This invention relates to the field of steel plate handling technology, and in particular to a steel plate loading and unloading mechanism and a hydraulic flatbed truck containing the mechanism. Background Technology

[0002] Hydraulic flatbed trucks are driven by a hydraulic system. They are typically equipped with multi-layered racks for transporting steel plates. During loading and unloading, the truck's lifting device can be raised or lowered by the hydraulic system to load and unload the steel plates on the racks. They are mainly used in industries such as automobile manufacturing, shipbuilding, and steel structures for transporting steel plates between processing stages, such as moving steel plates from storage areas to processing equipment like shearing machines and presses, or moving finished steel plates from processing equipment to stacking areas.

[0003] Typically, a robotic arm is used to pick up and unload steel plates from a rack. The steel plates are usually attached to the upper surface of the rack's mounting plate. When they are attached, the friction is high, and the robotic arm needs to output a greater suction force to lift the steel plates, increasing the drive load. Insufficient suction force may even cause the steel plates to fall off. In addition, if there are iron filings, dust, or other impurities on the mounting plate surface, these impurities will be squeezed between the steel plates and the mounting plate when they are attached, causing more serious scratches or indentations during unloading, which will affect the quality of the steel plates. Summary of the Invention

[0004] Therefore, it is necessary to provide a steel plate loading and unloading mechanism that facilitates robotic arm adsorption during unloading, and a hydraulic flatbed truck containing such mechanism, to address the aforementioned technical problems.

[0005] The present invention provides a steel plate loading and unloading mechanism, including a bracket, and further comprising: Multiple sliding grooves are linearly arrayed from top to bottom on both sides of the support. The shelf is movable at both ends within the sliding groove, and its interior is hollow. A steel plate is placed on the middle of the upper surface of the shelf; The slots are arranged in a horizontal linear array on the upper surface of the shelf and are interconnected with the interior of the shelf; multiple slots are provided. The top plate is movably disposed within the slot and movably abuts against the bottom of the steel plate. A lifting assembly is located inside the shelf and is used to move the top plate up and down.

[0006] In one embodiment, the lifting assembly includes a movable plate, which is fixedly installed at the bottom of the top plate. A plurality of fixed cylinders are fixedly installed inside the inner wall of the shelf, and a movable rod is movably disposed inside the fixed cylinder. The end of the movable rod away from the fixed cylinder is fixedly connected to the bottom of the movable plate, and the bottom of the movable plate is fixedly connected to the inner wall of the shelf by a positioning spring.

[0007] In one embodiment, a fixed plate is fixedly installed inside the chute. The fixed plate has a straight groove and an inclined groove, which are connected to each other. The straight groove and the inclined groove movably penetrate the inner wall of the shelf. Limiting rods are fixedly installed at both ends of the movable plate. The end of the limiting rod away from the movable plate is slidably connected to the straight groove and the inclined groove.

[0008] In one embodiment, the top of the shelf is provided with slots at opposite corners of the steel plate, and a locking block is movably disposed in the slot, the locking block abutting against the side wall of the steel plate.

[0009] In one embodiment, the bottom of the card block is fixedly connected to the inner wall of the shelf by a return spring, and a movable block is movably provided on one side of the card block, and one side of the movable block is elastically connected to the inner wall of the card block.

[0010] In one embodiment, a positioning frame is fixedly installed inside the shelf on one side of the card block, and a card plate is movably disposed inside the positioning frame. The end of the card plate away from the positioning frame is movably abutting against the movable block.

[0011] In one embodiment, both the card plate and the movable block have notches at their respective ends, and the ends of the two blocks without the notches overlap and limit each other.

[0012] In one embodiment, a movable rod is fixedly provided at both ends of the movable plate, and a sliding groove is provided on the card plate. The end of the movable rod away from the movable plate is slidably connected to the sliding groove.

[0013] In one embodiment, the top of the shelf is provided with axially symmetrical horizontal grooves at both ends. A round rod is movably arranged in the horizontal groove. A pressure plate is fixedly arranged on the top of the round rod. The pressure plate movably abuts against the surface of the steel plate. A groove is movably provided through the other end of the pressure plate. A vertical rod is movably provided through the groove. A cam is fixedly arranged on the top of the vertical rod. A push block is fixedly arranged on the top of the pressure plate on one side of the cam. The push block movably abuts against the cam.

[0014] In one embodiment, a vertical plate is fixedly installed on one side of the horizontal groove of the shelf, and the vertical plate is fixedly connected to the round rod by a snap-fit ​​spring. A gear is fixedly installed on the outside of the vertical rod, and a rack is fixedly installed on the bracket. The gear meshes with the rack for transmission.

[0015] In one embodiment, the bracket has a vertical groove at the opening of the slide groove, and a stop block is movably disposed in the vertical groove. The bottom of the stop block is elastically connected to the inner wall of the vertical groove. The stop blocks on both sides of the same height are fixedly connected by a handle, and the handle is slidably connected to the bracket.

[0016] In one embodiment, a hydraulic flatbed truck includes the aforementioned steel plate loading and unloading mechanism.

[0017] The aforementioned steel plate loading and unloading mechanism and hydraulic flatbed truck containing this mechanism can move the steel plate upward a short distance during unloading via a lifting component. The contact area between the bottom of the steel plate and the top plate is much smaller than the previous contact area with the placement plate, making it easier for the robotic arm to pick it up and preventing friction with residual iron filings or other impurities on the placement plate, thus avoiding unnecessary damage. The cooperation between the locking block and the movable block allows the locking block to spring upward and limit the steel plate when it is lifted, preventing it from slipping. The cooperation between the cam and the push block allows the pressure plate to squeeze and limit the steel plate, ensuring its stability during transportation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bracket in this invention; Figure 3 for Figure 2 Enlarged diagram of part A in the middle; Figure 4 for Figure 2 Enlarged diagram of section B; Figure 5 This is a schematic diagram of the internal structure of the shelf in this invention; Figure 6 for Figure 5 Enlarged diagram of section C; Figure 7This is a schematic diagram of the top plate structure in this invention; Figure 8 This is a schematic diagram of the limiting rod in this invention; Figure 9 This is a schematic diagram of the groove structure in this invention.

[0020] Figure label: 1. Bracket; 101. Slide groove; 102. Vertical groove; 2. Steel plate; 3. Top plate; 4. Shelf; 41. Groove; 42. Slot; 43. Horizontal groove; 5. Lifting assembly; 51. Movable plate; 52. Fixed cylinder; 53. Movable rod; 54. Positioning spring; 6. Fixed plate; 61. Straight groove; 62. Inclined groove; 7. Limiting rod; 8. Locking block; 9. Return spring; 10. Movable block; 11. Positioning frame; 12. Locking plate; 121. Sliding groove; 13. Notch; 14. Moving rod; 15. Round rod; 16. Pressure plate; 161. Groove; 17. Vertical rod; 18. Cam; 19. Push block; 20. Vertical plate; 21. Locking spring; 22. Gear; 23. Rack; 24. Stop block; 25. Handle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0026] The following is combined with Figures 1-9 This invention describes a steel plate loading and unloading mechanism and a hydraulic flatbed cart containing the mechanism.

[0027] like Figures 1-5 As shown, in one embodiment, a steel plate 2 loading and unloading mechanism includes a support 1, and further includes: The slide grooves 101 are linearly arrayed from top to bottom on both sides of the support 1, and the number of them is set to multiple. The shelf 4 is movably mounted in the slide 101 at both ends, and is hollow inside. Steel plate 2 is placed in the middle of the upper surface of shelf 4; The slots 41 are arranged in a horizontal linear array on the upper surface of the shelf 4 and are interconnected with the interior of the shelf 4. Multiple slots are provided. The top plate 3 is movably set in the groove 41 and movably abuts against the bottom of the steel plate 2; The lifting component 5 is located inside the shelf 4 and is used to move the top plate 3 up and down.

[0028] Specifically, multiple shelves 4 are arranged in a linear array from top to bottom on the support 1, with a certain gap between adjacent shelves 4 to facilitate the pulling of shelves 4 for unloading steel plates 2. When unloading is required, the topmost steel plate 2 is unloaded first, and the topmost shelf 4 moves outward along the transverse groove 43. The shelf 4 drives the corresponding steel plate 2 to move outward of the support 1. The movement of the shelf 4 can be driven by a motor or hydraulic system. After the shelf 4 has moved most of its way to the outside of the support 1, it stops moving. At this time, the lifting component 5 drives the top plate 3 relative to the groove 4. 1. Moving upwards, the top plate 3 moves the steel plate 2 upwards a short distance, preventing it from touching the surface of the shelf 4. Multiple top plates 3 are installed to ensure the stability of the steel plate 2 during the lifting process. Then, a robotic arm is used to pick up the upper surface of the steel plate 2 for unloading. The contact area between the bottom of the steel plate 2 and the top plate 3 is much smaller than the previous contact area with the shelf 4. This makes it easier for the robotic arm to pick it up and avoids friction with residual iron filings and other impurities on the shelf 4, which could cause unnecessary damage. The steel plates 2 of the lower layers are unloaded in the same way.

[0029] See Figure 5 As shown, in this embodiment, the lifting assembly 5 includes a movable plate 51, which is fixedly installed at the bottom of the top plate 3. Multiple fixed cylinders 52 are fixedly installed inside the inner wall of the shelf 4. A movable rod 53 is movably arranged inside the fixed cylinder 52. The end of the movable rod 53 away from the fixed cylinder 52 is fixedly connected to the bottom of the movable plate 51. The bottom of the movable plate 51 is fixedly connected to the inner wall of the shelf 4 by a positioning spring 54.

[0030] Specifically, during the movement of the shelf 4 to the outside of the bracket 1, the movable plate 51 moves upward relative to the inside of the shelf 4. The upward movement of the movable plate 51 will drive multiple top plates 3 to move upward synchronously, thereby lifting the steel plate 2 a short distance upward, so that it is no longer in contact with the surface of the shelf 4, making it easier for the robotic arm to pick it up. During the upward movement of the movable plate 51, the movable rod 53 will move upward relative to the fixed cylinder 52, which can ensure the stability of the movable plate 51 during the upward movement, prevent deviation, and avoid the steel plate 2 from slipping. During this process, the positioning spring 54 will be stretched, which can further improve the stability of the movable plate 51 during the upward movement.

[0031] See Figure 4 and Figure 8 As shown, in this embodiment, a fixing plate 6 is fixedly installed inside the slide 101. The fixing plate 6 has a straight groove 61 and an inclined groove 62, which are connected to each other. The straight groove 61 and the inclined groove 62 movably penetrate the inner wall of the shelf 4. Limiting rods 7 are fixedly installed at both ends of the movable plate 51. The end of the limiting rod 7 away from the movable plate 51 is slidably connected to the straight groove 61 and the inclined groove 62.

[0032] Specifically, when the shelf 4 moves outward along the slide groove 101 opened in the bracket 1, the two ends of the shelf 4 slide against the fixed plates 6 on both sides respectively. The movable plate 51 and the limiting rod 7 also move synchronously together. The limiting rod 7 first moves laterally along the straight groove 61. At this time, the movable plate 51 and the top plate 3 will not move upward. The inclined groove 62 is opened at the end of the fixed plate 6 and is located at the opening of the slide groove 101. The limiting rod 7 moves upward along the inclined groove 62, which will drive the movable plate 51 and the top to move upward synchronously, thereby moving the steel plate 2 upward and lifting it up, so that the robot arm can adsorb it.

[0033] See Figure 2 and Figure 3 As shown, in this embodiment, the top of the shelf 4 is provided with slots 42 at opposite corners of the steel plate 2, and a locking block 8 is movably disposed in the slot 42, and the locking block 8 movably abuts against the side wall of the steel plate 2.

[0034] Specifically, when the top plate 3 moves upward and drives the steel plate 2 upward, although there are multiple top plates 3 supporting the bottom, the steel plate 2 is mostly suspended. In order to prevent the steel plate 2 from slipping, the locking block 8 can be moved upward along the locking groove 42. The locking block 8 wraps and limits the diagonal sides of the steel plate 2, which can ensure the stability of the steel plate 2 in the lifted state.

[0035] See Figure 6 As shown, in this embodiment, the bottom of the card block 8 is fixedly connected to the inner wall of the shelf 4 by a reset spring 9, and a movable block 10 is movably provided on one side of the card block 8, and the movable block 10 is elastically connected to the inner wall of the card block 8 on one side.

[0036] Specifically, in the initial state, pressing down on the movable block 10 causes it to move downwards, which in turn moves the locking block 8 downwards. The return spring 9 is in a compressed state. When the steel plate 2 is lifted upwards, the force applied to the movable block 10 is removed. Under the action of the return spring 9, the locking block 8 moves upwards. The locking block 8 wraps around and limits the diagonal part of the steel plate 2, ensuring the stability of the steel plate 2 in the lifted state.

[0037] See Figure 6 As shown, in this embodiment, a positioning frame 11 is fixedly installed inside the storage plate 4 on one side of the card block 8, and a card plate 12 is movably disposed inside the positioning frame 11. The end of the card plate 12 away from the positioning frame 11 is movably abutted against the movable block 10.

[0038] Specifically, in the initial state, the clamping plate 12 is located above the movable block 10, and the return spring 9 is in a compressed state. When the steel plate 2 is lifted, the clamping plate 12 moves along the positioning frame 11 to the end away from the movable block 10 until the two no longer contact each other. Under the action of the return spring 9 springing upward, it will drive the clamping block 8 to limit the steel plate 2.

[0039] See Figure 6 As shown, in this embodiment, the card plate 12 and the movable block 10 are both provided with notches 13 at their respective ends, and the ends of the two without notches 13 overlap and limit each other.

[0040] Specifically, after the locking block 8 limits the diagonal of the steel plate 2, the robotic arm performs an adsorption and unloading operation on the surface of the steel plate 2. After the steel plate 2 is unloaded, it is placed back onto the top plate 3. If no new steel plate 2 is to be placed, the placement plate 4 is pushed inward along the slide 101. At this time, the height of the locking block 8 is higher than that of the placement plate 4. If a new steel plate 2 is to be placed, the diagonal of the steel plate 2 is aligned with the locking block 8, which facilitates the placement of the steel plate 2. During the movement of the placement plate 4 into the bracket 1, the locking block 8 can also limit the steel plate 2. As the placement plate 4 moves inward, the locking plate 12 moves in the opposite direction to return it to its initial position. When the placement plate 4 is in place, the locking block 12 is pressed down. Block 8, the locking block 8 drives the movable block 10 to move downwards. During the descent, the movable block 10 abuts against one side of the locking plate 12. The part with the notch 13 on both sides abuts against each other. The movable block 10 will move towards the inside of the locking block 8. When the movable block 10 moves below the locking plate 12, since the movable block 10 is elastically connected to the inner wall of the locking block 8, the movable block 10 loses the limit of the locking plate 12. The end of the movable block 10 without the notch 13 will abut against the end of the locking plate 12 without the notch 13. At this time, the locking block 8 is in a stable state. During transportation, the locking block 8 does not abut against the steel plate 2, thus reducing the friction between the steel plate 2 and the locking block 8 during transportation and avoiding wear.

[0041] See Figures 6-8 As shown, in this embodiment, both ends of the movable plate 51 are fixedly provided with moving rods 14, and the card plate 12 is provided with a sliding groove 121. The end of the moving rod 14 away from the movable plate 51 is slidably connected to the sliding groove 121.

[0042] Specifically, when the movable plate 51 moves outward along the shelf 4 towards the outside of the bracket 1, the limiting rod 7 will move along the straight groove 61 and the inclined groove 62, and eventually move upward. The upward movement of the movable plate 51 will drive the moving rod 14 to move upward synchronously. One end of the moving rod 14 moves upward along the sliding groove 121. The sliding groove 121 consists of a straight groove and a curved groove. When the moving rod 14 moves along the curved groove, it will drive the locking plate 12 to move away from the movable block 10. This allows the return spring 9 to drive the locking block 8 to move upward to limit and protect the steel plate 2 in the jacked state. The operation is convenient and quick, and it is automatically triggered.

[0043] See Figure 3 and Figure 9As shown, in this embodiment, the top two ends of the shelf 4 are axially symmetrically provided with transverse grooves 43. A round rod 15 is movably arranged in the transverse groove 43. A pressure plate 16 is fixedly arranged on the top of the round rod 15. The pressure plate 16 is movably abutting against the surface of the steel plate 2. A groove 161 is movably provided through the other end of the pressure plate 16. A vertical rod 17 is movably provided through the groove 161. A cam 18 is fixedly arranged on the top of the vertical rod 17. A push block 19 is fixedly arranged on the top of the pressure plate 16 on one side of the cam 18. The push block 19 is movably abutting against the cam 18.

[0044] Specifically, when the steel plate 2 is placed on the shelf 4 and the shelf 4 is located inside the bracket 1, one end of the pressure plate 16 abuts against the steel plate 2, and the protrusion of the cam 18 abuts against the push block 19, which can limit the steel plate 2. When unloading is required, most of the shelf 4 moves to the outside of the bracket 1. During this process, the vertical rod 17 is rotated, and the rotation of the vertical rod 17 drives the cam 18 to rotate 90 degrees. The protrusion of the cam 18 does not abut against the push block 19. Then, the round rod 15 is moved away from the steel plate 2. The round rod 15 moves along the transverse groove 43, which will drive the pressure plate 16 to move laterally. The pressure plate 16 no longer abuts against the steel plate 2. During the movement of the pressure plate 16, the vertical rod 17 moves relative to the groove 161. There will be no collision between the two. Finally, the steel plate 2 is picked up by the robot, and the unloading is completed.

[0045] See Figure 2 , Figure 3 and Figure 9 As shown, in this embodiment, a vertical plate 20 is fixedly installed on one side of the horizontal groove 43 of the shelf 4. The vertical plate 20 is fixedly connected to the round rod 15 by a snap-fit ​​spring 21. A gear 22 is fixedly installed on the outside of the vertical rod 17. A rack 23 is fixedly installed on the bracket 1. The gear 22 and the rack 23 mesh and drive each other.

[0046] Specifically, in the initial state, the pressure plate 16 limits and fixes the steel plate 2. At this time, the snap-fit ​​spring 21 is in a stretched state. When it is necessary to unload the material, the placement plate 4 moves outward. During the movement of the gear 22, it will mesh with the rack 23 to realize the rotation of the vertical rod 17. The rotation of the vertical rod 17 will drive the cam 18 to rotate. The protrusion of the cam 18 rotates to one side. Under the action of the snap-fit ​​spring 21, it will pull the round rod 15 to move laterally along the transverse groove 43, so that the pressure plate 16 no longer squeezes and fixes the steel plate 2, which facilitates the subsequent unloading of the steel plate 2.

[0047] See Figure 2 and Figures 4-5 As shown, in this embodiment, the bracket 1 has a vertical groove 102 at the opening of the slide groove 101. A stop block 24 is movably arranged in the vertical groove 102. The bottom of the stop block 24 is elastically connected to the inner wall of the vertical groove 102. The stop blocks 24 on both sides of the same height are fixedly connected by a handle 25. The handle 25 is slidably connected to the bracket 1.

[0048] Specifically, when the shelf 4 is equipped with the steel plate 2 and is located inside the bracket 1, part of the stop block 24 is located outside the vertical groove 102 and abuts against the shelf 4. This ensures that the shelf 4 will not move during transportation and guarantees the safety of transporting the steel plate 2. When the material needs to be unloaded at the preset location, press down on the handle 25. The downward movement of the handle 25 will drive the two stops 24 of the same height to move into the vertical groove 102. The stops no longer limit the shelf 4. At this time, the shelf 4 can be moved outward for easy unloading.

[0049] In this embodiment, a hydraulic flatbed truck includes the above-mentioned steel plate 2 loading and unloading mechanism.

[0050] Specifically, the hydraulic flatbed truck can be equipped with the aforementioned loading and unloading mechanism, and also needs to be equipped with a corresponding robotic arm to absorb and unload the steel plate 2.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A steel plate loading and unloading mechanism, comprising a support frame, characterized in that, Also includes: Multiple sliding grooves are linearly arrayed from top to bottom on both sides of the support. The shelf is movable at both ends within the sliding groove, and its interior is hollow. A steel plate is placed on the middle of the upper surface of the shelf; The slots are arranged in a horizontal linear array on the upper surface of the shelf and are interconnected with the interior of the shelf; multiple slots are provided. The top plate is movably disposed within the slot and movably abuts against the bottom of the steel plate. A lifting assembly is located inside the shelf and is used to move the top plate up and down.

2. The steel plate loading and unloading mechanism according to claim 1, characterized in that, The lifting assembly includes a movable plate, which is fixedly installed at the bottom of the top plate. Multiple fixed cylinders are fixedly installed inside the inner wall of the shelf, and a movable rod is movably arranged inside the fixed cylinder. The end of the movable rod away from the fixed cylinder is fixedly connected to the bottom of the movable plate. The bottom of the movable plate is fixedly connected to the inner wall of the shelf by a positioning spring.

3. The steel plate loading and unloading mechanism according to claim 2, characterized in that, A fixed plate is fixedly installed inside the chute. The fixed plate has a straight groove and an inclined groove, which are connected to each other. The straight groove and the inclined groove movably pass through the inner wall of the shelf. Limiting rods are fixedly installed at both ends of the movable plate. The end of the limiting rod away from the movable plate is slidably connected to the straight groove and the inclined groove.

4. The steel plate loading and unloading mechanism according to claim 2, characterized in that, The top of the shelf is provided with slots at opposite corners of the steel plate, and a locking block is movably disposed in the slot, the locking block abutting against the side wall of the steel plate.

5. A steel plate loading and unloading mechanism according to claim 4, characterized in that, The bottom of the card block is fixedly connected to the inner wall of the shelf by a return spring. A movable block is movably provided on one side of the card block, and one side of the movable block is elastically connected to the inner wall of the card block.

6. A steel plate loading and unloading mechanism according to claim 5, characterized in that, A positioning frame is fixedly installed inside the storage plate on one side of the card block. A card plate is movably disposed inside the positioning frame, and the end of the card plate away from the positioning frame is movably abutting against the movable block.

7. A steel plate loading and unloading mechanism according to claim 6, characterized in that, Both the card plate and the movable block have notches at their respective ends, and the ends of the two blocks without the notches overlap for positioning.

8. A steel plate loading and unloading mechanism according to claim 6, characterized in that, Both ends of the movable plate are fixedly provided with moving rods, and the plate is provided with sliding grooves. The end of the moving rod away from the movable plate is slidably connected to the sliding groove.

9. A steel plate loading and unloading mechanism according to claim 1, characterized in that, The top of the shelf has symmetrically axially oriented horizontal grooves at both ends. A round rod is movably arranged in the horizontal groove. A pressure plate is fixedly arranged on the top of the round rod. The pressure plate movably abuts against the surface of the steel plate. A groove is movably inserted through the other end of the pressure plate. A vertical rod is movably inserted through the groove. A cam is fixedly arranged on the top of the vertical rod. A push block is fixedly arranged on the top of the pressure plate on one side of the cam. The push block movably abuts against the cam.

10. A steel plate loading and unloading mechanism according to claim 9, characterized in that, A vertical plate is fixedly installed on one side of the horizontal groove of the storage plate. The vertical plate is fixedly connected to the round rod by a snap-fit ​​spring. A gear is fixedly installed on the outside of the vertical rod. A rack is fixedly installed on the bracket. The gear meshes with the rack for transmission.

11. A steel plate loading and unloading mechanism according to claim 1, characterized in that, The bracket has a vertical groove at the opening of the slide groove, and a stop block is movably arranged in the vertical groove. The bottom of the stop block is elastically connected to the inner wall of the vertical groove. The stop blocks on both sides of the same height are fixedly connected by a handle, and the handle is slidably connected to the bracket.

12. A hydraulic flatbed truck, characterized in that, It includes a steel plate loading and unloading mechanism as described in any one of claims 1-11.

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