A backplane loading device

Abstract

The present application relates to the field of backboard processing, specifically to a backboard feeding device, comprising a supporting platform and a jacking cylinder, two pairs of first limiting rods are symmetrically arranged in a vertical state on the supporting platform, a first side pressing plate and a second side pressing plate are also symmetrically arranged on the supporting platform, a second limiting rod is arranged on each side of the first side pressing plate, a third limiting rod is arranged on each side of the second side pressing plate, a rolling pressing part is arranged at the upper end of the first limiting rod, an automatic pushing assembly is arranged at the upper end of the third limiting rod, and an elastic downward pressing part is arranged on the second side pressing plate, the backboard is pushed to the position in contact with the extension shaft by the automatic pushing assembly, so that the uppermost backboard and the lower backboard are in a staggered state, and the lower backboard is subjected to a vertical downward pressing force under the action of the elastic downward pressing part, ensuring that the uppermost backboard is separated from the lower backboard when it is taken away, and so on, effectively preventing the problem that multiple backboards are simultaneously sucked away.

Description

Technical Field

[0001] This invention relates to the field of backplate processing, and more specifically to a backplate loading device. Background Technology

[0002] During assembly line operations, the back panels stored in the early stage are in a stacked state. They need to be placed one by one on the oiling platform, and after the oiling step, they are put into the mold for stamping. During the back panel loading process, because the back panels are in a close fit, multiple panels will be lifted during the loading process, which will affect subsequent processing.

[0003] The currently disclosed Chinese patent CN220131253U describes a backplate loading device, including a storage device. The storage device is located on the side of a conveyor line, and a transfer device is provided between the conveyor line and the storage device to transfer the stacked backplates stored in the storage device to the conveyor line. The storage device includes two symmetrically arranged side supports, a rear plate, a storage platform, and a ball screw mechanism. The side supports include a top plate, a bottom plate, and a vertical plate. The storage platform is located between the two side supports. The four corners of the storage platform are slidably connected to an optical shaft via linear bearings, and the upper and lower ends of the optical shaft are fixedly connected to the top plate and the bottom plate. The ball screw mechanism... The transfer device is rotatably mounted on a side bracket, with a lifting power device fixedly mounted on the top of the side bracket. The lifting power device drives the lead screw of the ball screw mechanism, and the lead screw nut of the ball screw mechanism is fixedly connected to both sides of the material platform through a nut seat. The transfer device includes two track seats, a transfer power device, a transfer transmission mechanism, and a suction cup device. The two track seats are respectively mounted on the top of their respective side brackets, and the rear end of the track seats extends above the conveyor line. A horizontal track is fixedly mounted on the track seat, and a horizontal moving seat is slidably connected to the horizontal track through a slider. The transfer power device drives the horizontal moving seat to move horizontally through the transfer transmission mechanism.

[0004] According to the aforementioned patent, the patent temporarily stores the backplate using a storage device and then transfers the backplate stored in the storage device to the conveyor line using a transfer device. The continuous feeding of the backplate is completed by replacing manual labor with a mechanical structure. However, the adhesion between the backplates cannot be separated, and it is impossible to ensure accurate feeding of a single backplate. Therefore, there is a need for a feeding device that can guarantee the feeding of a single backplate. Summary of the Invention

[0005] To address the problems existing in the current technology, this invention provides a backplate feeding device. The invention uses an automatic pushing component to push the backplate to a position that contacts the extension shaft, so that the uppermost backplate and the lower backplate are staggered. Under the action of the elastic pressing component, the lower backplate is subjected to vertical downward pressure, ensuring that the uppermost backplate is separated from the lower backplate when it is removed. This process is repeated to effectively prevent the problem of multiple backplates being sucked away at the same time.

[0006] To address the problems of existing technologies, this invention provides a backplate loading device, comprising a support platform for stacking several backplates and a lifting cylinder disposed at the bottom of the support platform. The support platform is vertically and symmetrically provided with two pairs of first limiting rods to restrict the horizontal movement of the backplates in one direction. The support platform is also symmetrically provided with two first side pressure plates and second side pressure plates to restrict the horizontal movement of the backplates in another direction. Each side pressure plate has a second limiting rod on both sides, with its edge contacting the short side of the backplate. Similarly, each side pressure plate has a second limiting rod on both sides, with its edge contacting the short side of the backplate. The third limiting rod, the upper end of the first limiting rod is provided with a rolling pressing member to limit the back plate from being lifted into position, the upper end of the second limiting rod extends upward with an extension shaft with a diameter smaller than that of the second limiting rod, the straight distance between the extension shaft and the third limiting rod parallel to the long side of the back plate is greater than the length of the long side of the back plate, a gap is left between the upper end of the second limiting rod and the rolling pressing member to allow the back plate to move horizontally, the upper end of the third limiting rod is provided with an automatic pushing component to push the back plate toward the direction of the extension shaft, and the second side pressure plate is provided with an elastic pressing member that can contact the top surface of the back plate.

[0007] Preferably, the automatic feeding assembly is provided with a rotating push plate, one end of which is rotatably connected to the end of the third limiting rod, and the other end of the rotating push plate faces the back plate and the end of the rotating push plate facing the back plate is provided with a rubber pad that can contact the top surface of the back plate.

[0008] Preferably, the automatic feeding assembly is further provided with a first torsion spring and a push-pull member. The first torsion spring is fixedly connected between the rotating push plate and the third limiting rod. When the first torsion spring is in the normal state, the rubber pad at the end of the rotating push plate is pressing against the back plate and pushing it to contact the extension shaft. The push-pull member is used to control the rotating push plate to move closer to or away from the back plate. The push-pull member is disposed between the second side pressure plate and the rotating push plate.

[0009] Preferably, the push-pull component is provided with a guide rail, a slider, and a connecting rod. The guide rail is fixedly connected to the second side pressure plate, and the trajectory direction of the guide rail is perpendicular to the surface of the support back plate of the second side pressure plate. The slider is slidably disposed in the guide rail, and the connecting rod is disposed between the rotating push plate and the slider. The two ends of the connecting rod are rotatably connected to the rotating push plate and the slider, respectively.

[0010] Preferably, a first electromagnet is fixedly mounted on the slider, and a second electromagnet that cooperates with the first electromagnet is fixedly mounted on the guide rail.

[0011] Preferably, the elastic pressing member is provided with a pressure rod, which is vertically positioned at the end of the guide rail near the second side pressure plate. The pressure rod can move up and down. The end of the guide rail is provided with a guide opening for the pressure rod to move up and down. The lower end of the pressure rod extends downward through the guide opening, and the upper end of the pressure rod extends upward through the guide opening. The upper end of the pressure rod is provided with an anti-detachment ring. A spring sleeved on the pressure rod is fixedly connected between the anti-detachment ring and the guide rail. The lower end of the pressure rod presses against the top surface of the back plate.

[0012] Preferably, the lower end of the pressure bar is provided with a rubber head.

[0013] Preferably, the rolling pressing member is provided with a rotating strip, one end of which is rotatably connected to the end of the first limiting rod, and the other end of which extends toward the back plate. The extended end of the rotating strip is provided with balls that can roll into contact with the top surface of the back plate.

[0014] Preferably, a second torsion spring is fixedly connected between the rotating bar and the first limiting rod. When the second torsion spring is in normal state, the ball is in contact with the top surface of the back plate.

[0015] Preferably, a third electromagnet is fixedly provided on the rotating bar, and a fourth electromagnet that cooperates with the third electromagnet is fixedly provided on the first limiting rod.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The present invention uses an automatic feeding component to push the back plate to the position where it contacts the extension shaft, so that the uppermost back plate and the lower back plate are staggered. Under the action of the elastic pressing component, the lower back plate is subjected to vertical downward pressure, ensuring that the uppermost back plate is separated from the lower back plate when it is removed. This process is repeated, achieving the effect of accurately picking up the stacked back plates one by one and feeding them one piece at a time. This effectively prevents the problem of multiple back plates being picked up at the same time, and improves production efficiency and continuity. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a backplate loading device.

[0018] Figure 2 This is a top view of a backplate loading device.

[0019] Figure 3 yes Figure 2 A three-dimensional structural cross-sectional view of point AA.

[0020] Figure 4 yes Figure 3 Enlarged diagram of point B.

[0021] Figure 5 yes Figure 3 Enlarged diagram of point C.

[0022] Figure 6 This is a three-dimensional structural diagram of a backplate feeding device, comprising a third limiting rod, an automatic feeding assembly, and an elastic pressing component.

[0023] Figure 7 This is a bottom view of the third limit rod, automatic feeding assembly, and elastic pressing component of a backplate feeding device.

[0024] Figure 8 This is a three-dimensional structural diagram of a rolling pressing component of a backplate loading device.

[0025] Figure 9 This is a front view of the rolling pressing component of a backplate feeding device.

[0026] Figure 10 yes Figure 9 A three-dimensional sectional view of the DD section.

[0027] The following components are labeled in the diagram: 1. Back plate; 2. Support platform; 21. First side pressure plate; 22. Second side pressure plate; 3. Lifting cylinder; 4. First limiting rod; 41. Rolling pressing component; 411. Rotating bar; 4111. Third electromagnet; 4112. Fourth electromagnet; 412. Ball bearing; 413. Second torsion spring; 5. Second limiting rod; 51. Extension shaft; 6. Third limiting rod; 7. Automatic feeding assembly; 71. Rotating push plate; 711. Rubber pad; 72. First torsion spring; 73. Push-pull component; 731. Guide rail; 732. Slider; 7321. First electromagnet; 7322. Second electromagnet; 733. Connecting rod; 8. Elastic pressing component; 81. Pressure rod; 811. Anti-detachment ring; 812. Spring; 82. Rubber head. Detailed Implementation

[0028] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0029] See Figures 1-4As shown, a backplate loading device includes a support platform 2 for stacking several backplates 1 and a lifting cylinder 3 disposed at the bottom of the support platform 2. Two pairs of first limiting rods 4 are symmetrically arranged vertically on the support platform 2 to restrict the horizontal movement of the backplates 1 in one direction. Two first side pressure plates 21 and second side pressure plates 22 are also symmetrically arranged on the support platform 2 to restrict the horizontal movement of the backplates 1 in another direction. Each side of the first side pressure plate 21 has a second limiting rod 5 whose edge contacts the short side of the backplate 1. Each side of the second side pressure plate 22 has a third limiting rod 6 whose edge contacts the short side of the backplate 1. The upper end of the first limiting rod 4 is provided with a rolling pressing member 41 for limiting the back plate 1 to be lifted into position. The upper end of the second limiting rod 5 extends upward with an extension shaft 51 with a diameter smaller than that of the second limiting rod 5. The straight distance between the extension shaft 51 and the third limiting rod 6, parallel to the long side of the back plate 1, is greater than the length of the long side of the back plate 1. A gap is left between the upper end of the second limiting rod 5 and the rolling pressing member 41 for the back plate 1 to move horizontally. The upper end of the third limiting rod 6 is provided with an automatic pushing assembly 7 for pushing the back plate 1 toward the direction of the extension shaft 51. The second side pressure plate 22 is provided with an elastic pressing member 8 that can contact the top surface of the back plate 1.

[0030] During the loading process of backplate 1, the stacked backplates 1 are removed one by one. First, several backplates 1 are stacked on the support platform 2, and the backplates 1 are restricted by the cooperation of the first limiting rod 4, the first side pressure plate 21, and the second side pressure plate 22, ensuring the stability and accurate positioning of the stacked backplates 1 in two horizontal directions. When loading is required, the lifting cylinder 3 is activated, pushing the backplates 1 as a whole to rise. As the backplates 1 rise, the topmost backplate 1 first contacts the rolling pressure member 41, and the lifting cylinder 3 stops. At this time, the backplate 1 is within the range that can be pushed by the automatic pushing component 7, while the short side of the backplate 1 below the topmost one is still constrained in the horizontal direction by the second limiting rod 5 and the third limiting rod 6. The topmost backplate 1 is between the extension shaft 51 and the third limiting rod 6, providing horizontal sliding space for the backplate 1. At this time, the automatic pushing component 7... When the material assembly 7 is activated, the uppermost back plate 1 slides along the top surface of the lower back plate 1 and pushes it toward the extension shaft 51. The uppermost back plate 1 moves horizontally between the lower back plate 1 and the rolling pressing member 41, maintaining stability until the side of the uppermost back plate 1 contacts the extension shaft 51. At this point, the uppermost back plate 1 and the lower back plate 1 are misaligned. At the same time, the elastic pressing member 8 detaches from the uppermost back plate 1 under its elastic effect, thereby squeezing the lower back plate 1, ensuring that the uppermost back plate 1 is separated from the lower back plate 1 during the material feeding process. Finally, the automatic pushing assembly 7 and the rolling pressing member 41 move away from the back plate 1, and then the uppermost back plate 1 is removed vertically by the material transfer assembly, such as a vacuum suction cup or a robot. The lower back plate 1 gradually moves away from the removed back plate 1 under the action of the elastic pressing member 8, and then is smoothly removed to enter the next oiling and molding process.

[0031] See Figures 2-7 As shown, the automatic feeding assembly 7 is provided with a rotating push plate 71. One end of the rotating push plate 71 is rotatably connected to the end of the third limiting rod 6. The other end of the rotating push plate 71 faces the back plate 1, and the end of the rotating push plate 71 facing the back plate 1 is provided with a rubber pad 711 that can contact the top surface of the back plate 1.

[0032] When the uppermost back plate 1 is lifted to contact the rolling pressing member 41, the back plate 1 is located between the third limiting rod 6 and the extension shaft 51. The rotating push plate 71 in the automatic pushing assembly 7 starts to work. The rotating push plate 71 rotates freely around the axis of the third limiting rod 6. The rotating push plate 71 rotates towards the back plate 1 and gradually approaches the top surface of the back plate 1 with the end equipped with a rubber pad 711. Due to its material properties, the rubber pad 711 has good elasticity and cushioning effect. When it contacts the top surface of the back plate 1, it can push the back plate 1 forcefully, avoiding damage to the back plate 1 while ensuring sufficient pushing force. As the rotating push plate 71 continues to rotate, the rubber pad 711 continuously squeezes the uppermost back plate 1, causing it to move along the surface of the lower back plate 1 and towards the extension shaft 51 until the back plate 1 is misaligned with the lower back plate 1 and contacts the extension shaft 51. Then the rotation stops. Finally, the uppermost back plate 1 is removed without manual intervention, which improves production efficiency and operational safety, and ensures the factory quality of the back plate 1.

[0033] See Figures 2-7 As shown, the automatic feeding assembly 7 is also provided with a first torsion spring 72 and a push-pull member 73. The first torsion spring 72 is fixedly connected between the rotating push plate 71 and the third limiting rod 6. When the first torsion spring 72 is in the normal state, the rubber pad 711 at the end of the rotating push plate 71 is pressing against the back plate 1 and pushing it to contact the extension shaft 51. The push-pull member 73 is used to control the rotating push plate 71 to move closer to or away from the back plate 1. The push-pull member 73 is arranged between the second side pressure plate 22 and the rotating push plate 71.

[0034] When the automatic feeding assembly 7 is not activated, the first torsion spring 72 remains in normal condition. Its force keeps the rubber pad 711 of the rotating push plate 71 pressed against the uppermost back plate 1 and pushes it towards the extension shaft 51, ensuring that the back plate 1 is stably aligned with the extension shaft 51. To ensure that the uppermost back plate 1 is in precise contact with the extension shaft 51 and to prevent insufficient elasticity of the first torsion spring 72, the push-pull member 73 is activated. The push-pull member 73 applies a force to the rotating push plate 71, causing the rotating push plate 71 to rotate along the third limit rod 6. With the further action of the push-pull member 73, the rotating push plate 71 continues to rotate towards the back plate 1, and the rubber pad 711... Gradually increase the contact area and pressure with the back plate 1, continuously move the uppermost back plate 1 along the surface of the lower back plate 1 and towards the extension shaft 51 until the back plate 1 is fully in contact with the extension shaft 51 and offset from the lower back plate 1, reaching a state where it can be removed individually. When the back plate 1 is successfully pushed into place, the push-pull member 73 resets, causing the rotating push plate 71 to move away from the back plate 1. At this time, the first torsion spring 72 is in a torsional state, which does not hinder the removal of the back plate 1. When the lower back plate 1 is lifted into place, the push-pull member 73 stops, and the first torsion spring 72 returns to its normal state, automatically applying a pushing force to the back plate 1 under its torsion, thereby realizing a continuous and efficient single-piece back plate 1 separation process.

[0035] See Figures 3-7 As shown, the push-pull component 73 is provided with a guide rail 731, a slider 732 and a connecting rod 733. The guide rail 731 is fixedly connected to the second side pressure plate 22. The trajectory direction of the guide rail 731 is perpendicular to the surface of the support back plate 1 of the second side pressure plate 22. The slider 732 is slidably disposed in the guide rail 731. The connecting rod 733 is disposed between the rotating push plate 71 and the slider 732. The two ends of the connecting rod 733 are rotatably connected to the rotating push plate 71 and the slider 732 respectively.

[0036] When the push-pull action is not initiated, the slider 732 is located at a preset position on the guide rail 731. The two ends of the connecting rod 733 are rotatably connected to the rotating push plate 71 and the slider 732, respectively. At this time, due to the force of the first torsion spring 72, the rubber pad 711 on the rotating push plate 71 presses against the uppermost back plate 1 and pushes it towards the extension shaft 51. When it is necessary to provide thrust to the rotating push plate 71, the slider 732 moves along the guide rail 731. The linear motion of the slider 732 is converted into the rotational motion of the rotating push plate 71 around the third limiting rod 6 via the connecting rod 733. The connecting rod 733 drives the rotating push plate 71 to rotate towards the back plate 1. The contact area between the rubber pad 711 on the rotating push plate 71 and the back plate 1 gradually increases, increasing the contact area between the rubber pad 711 and the back plate 1. The applied pressure also increases, thus pushing the uppermost back plate 1 to translate along the surface of the lower back plate 1 and move closer to the extension shaft 51 until the back plate 1 is completely pushed towards the extension shaft 51 and offset from the lower back plate 1. The slider 732 stops moving, and the elastic pressing member 8 is squeezed from the uppermost back plate 1 onto the lower back plate 1. At this time, the uppermost back plate 1 is in a state where it can be removed individually. When the back plate 1 is removed, the slider 732 slides along the guide rail 731 in the opposite direction, driving the rotating push plate 71 away from the back plate 1, without hindering the removal of the back plate 1. The precise control of the movement of the rotating push plate 71 achieves effective docking between the back plate 1 and the extension shaft 51, ensuring a stable, continuous and efficient separation and pushing process for the single back plate 1.

[0037] See Figure 6 and Figure 7 As shown, a first electromagnet 7321 is fixed on the slider 732, and a second electromagnet 7322 that cooperates with the first electromagnet 7321 is fixed on the guide rail 731.

[0038] The movement of slider 732 is controlled by the magnetic force between the first electromagnet 7321 and the second electromagnet 7322. When slider 732 needs to be pushed, the attraction or repulsion between the two can be achieved by adjusting the direction or intensity of the current between the first electromagnet 7321 and the second electromagnet 7322, thereby driving slider 732 to move along guide rail 731, indirectly driving rotating push plate 71 to apply pushing force to back plate 1. Conversely, when it is necessary to stop pushing or reset slider 732, it is only necessary to change the working state of the first electromagnet 7321 and the second electromagnet 7322.

[0039] See Figure 1 , Figure 5 and Figure 6As shown, the elastic pressing member 8 is provided with a pressing rod 81. The pressing rod 81 is vertically positioned at the end of the guide rail 731 near the second side pressing plate 22. The pressing rod 81 can move up and down. The end of the guide rail 731 is provided with a guide opening for the pressing rod 81 to move up and down. The lower end of the pressing rod 81 extends downward through the guide opening, and the upper end of the pressing rod 81 extends upward through the guide opening. The upper end of the pressing rod 81 is provided with an anti-detachment ring 811. A spring 812 is fixedly connected between the anti-detachment ring 811 and the guide rail 731 and is sleeved on the pressing rod 81. The lower end of the pressing rod 81 presses against the top surface of the back plate 1.

[0040] Under the action of spring 812, the pressure bar 81 always maintains downward pressure on the back plate 1. When the uppermost back plate 1 is successfully pushed away by the automatic pusher assembly 7, the pressure above is reduced. At this time, the energy stored in spring 812 is released, allowing the pressure bar 81 to continue moving downward, moving down to the top surface of the next back plate 1 to be separated, and using its lower end to press against the back plate 1, continuing to provide downward pressure to maintain the stability of the stacked back plates 1. This ensures that the stacked back plates 1 remain stable during the separation process, avoiding the situation where the remaining back plates 1 are carried out after the upper back plate 1 is removed, and effectively preventing the problem of multiple back plates 1 being sucked away at the same time.

[0041] See Figure 6 and Figure 7 As shown, the lower end of the pressure rod 81 is provided with a rubber head 82.

[0042] With its soft and elastic material properties, the rubber head 82 smoothly contacts and presses against the top surface of the back plate 1 to be separated, effectively avoiding scratches or damage that the metal material may cause to the surface of the back plate 1.

[0043] See Figures 1-3 and Figures 8-10 As shown, the rolling pressing member 41 is provided with a rotating strip 411. One end of the rotating strip 411 is rotatably connected to the end of the first limiting rod 4, and the other end of the rotating strip 411 extends toward the back plate 1. The extended end of the rotating strip 411 is provided with a ball bearing 412 that can roll and contact the top surface of the back plate 1.

[0044] During the stacking and lifting of the back plates 1, as the uppermost back plate 1 rises to the position of contacting the rolling pressing member 41, the ball bearing 412 maintains a rolling contact with the top surface of the back plate 1. The ball bearing 412 replaces the traditional hard contact with its own rolling friction. During the translation of the back plate 1, the contact resistance and wear are effectively reduced. When the back plate 1 is removed, the rotating strip 411 is rotated to a direction away from the back plate 1, so as not to hinder the removal of the back plate 1.

[0045] See Figures 8-10As shown, a second torsion spring 413 is fixedly connected between the rotating strip 411 and the first limiting rod 4. When the second torsion spring 413 is in the normal state, the ball 412 is in contact with the top surface of the back plate 1.

[0046] Under normal conditions, the second torsion spring 413 provides a preset elastic force to the rotating bar 411, so that the ball 412 is in contact with the top surface of the back plate 1. When the rotating bar 411 rotates outward, the second torsion spring 413 is in a torsional state, and the ball 412 moves away from the back plate 1.

[0047] See Figures 8-10 As shown, a third electromagnet 4111 is fixed on the rotating bar 411, and a fourth electromagnet 4112 that cooperates with the third electromagnet 4111 is fixed on the first limiting rod 4.

[0048] The rotating bar 411 is controlled to rotate along the axis of the first limiting rod 4 by the magnetic force between the third electromagnet 4111 and the fourth electromagnet 4112. When it is necessary to control the ball 412 to contact the back plate 1, this is achieved by controlling the energization state between the third electromagnet 4111 and the fourth electromagnet 4112. When the third electromagnet 4111 and the fourth electromagnet 4112 are de-energized, the second torsion spring 413 causes the rotating bar 411 to return to its initial position, driving the rotating bar 411 and the ball 412 to approach the top surface of the back plate 1 and maintain a pressing state. When the third electromagnet 4111 and the fourth electromagnet 4112 repel each other, the ball 412 separates from the back plate 1.

[0049] The present invention uses an automatic feeding assembly 7 to push the back plate 1 to the position where it contacts the extension shaft 51, so that the uppermost back plate 1 and the lower back plate 1 are staggered. Under the action of the elastic pressing member 8, the lower back plate 1 is subjected to vertical downward pressure, ensuring that the uppermost back plate 1 is separated from the lower back plate 1 when it is removed. This process is repeated to effectively prevent the problem of multiple back plates 1 being sucked away at the same time, thereby improving production efficiency and continuity.

[0050] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present 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 all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A backplate loading device, comprising a support platform (2) for stacking a plurality of backplates (1) and a lifting cylinder (3) disposed at the bottom of the support platform (2). The support platform (2) is symmetrically provided with two pairs of first limiting rods (4) in a vertical state to restrict the horizontal movement of the back plate (1). The support platform (2) is also symmetrically provided with two first side pressure plates (21) and second side pressure plates (22) to restrict the horizontal movement of the back plate (1). Its features are, The first side pressure plate (21) has a second limiting rod (5) on both sides, the edge of which contacts the short side of the back plate (1), and the second side pressure plate (22) has a third limiting rod (6) on both sides, the edge of which contacts the short side of the back plate (1). The upper end of the first limiting rod (4) is provided with a rolling pressing member (41) to limit the back plate (1) from being lifted into place. The upper end of the second limiting rod (5) extends upward with an extension shaft (51) with a diameter smaller than that of the second limiting rod (5). The straight distance between the extension shaft (51) and the third limiting rod (6) parallel to the long side of the back plate (1) is greater than the length of the long side of the back plate (1). A gap is left between the upper end of the second limiting rod (5) and the rolling pressing part (41) for the back plate (1) to move horizontally. The upper end of the third limiting rod (6) is provided with an automatic feeding assembly (7) for pushing the back plate (1) toward the extension shaft (51), and the second side pressure plate (22) is provided with an elastic pressing member (8) that can contact the top surface of the back plate (1); The automatic feeding assembly (7) is provided with a rotating push plate (71). One end of the rotating push plate (71) is rotatably connected to the end of the third limiting rod (6). The other end of the rotating push plate (71) faces the back plate (1), and the end of the rotating push plate (71) facing the back plate (1) is provided with a rubber pad (711) that can contact the top surface of the back plate (1). The automatic feeding assembly (7) is also provided with a first torsion spring (72) and a push-pull member (73); The first torsion spring (72) is fixedly connected between the rotating push plate (71) and the third limiting rod (6). When the first torsion spring (72) is in normal state, the rubber pad (711) at the end of the rotating push plate (71) is pressing against the back plate (1) and pushing it to contact the extension shaft (51). The push-pull component (73) is used to control the rotating push plate (71) to move closer to or away from the back plate (1). The push-pull component (73) is disposed between the second side pressure plate (22) and the rotating push plate (71). The push-pull component (73) is provided with a guide rail (731), a slider (732) and a connecting rod (733); The guide rail (731) is fixedly connected to the second side pressure plate (22), and the trajectory direction of the guide rail (731) is perpendicular to the surface of the second side pressure plate (22) supporting the back plate (1); The slider (732) is slidably disposed in the guide rail (731); The connecting rod (733) is located between the rotating push plate (71) and the slider (732), and the two ends of the connecting rod (733) are rotatably connected to the rotating push plate (71) and the slider (732) respectively.

2. The backplate loading device according to claim 1, characterized in that, A first electromagnet (7321) is fixed on the slider (732), and a second electromagnet (7322) that cooperates with the first electromagnet (7321) is fixed on the guide rail (731). The movement of the slider (732) is controlled by the magnetic force between the first electromagnet (7321) and the second electromagnet (7322).

3. The backplate loading device according to claim 1, characterized in that, The elastic pressing member (8) is provided with a pressing rod (81). The pressing rod (81) is set vertically at the end of the guide rail (731) near the second side pressing plate (22). The pressing rod (81) can move up and down. The end of the guide rail (731) is provided with a guide opening for the pressing rod (81) to move up and down. The lower end of the pressing rod (81) extends downward through the guide opening, and the upper end of the pressing rod (81) extends upward through the guide opening. The upper end of the pressing rod (81) is provided with an anti-detachment ring (811). A spring (812) sleeved on the pressing rod (81) is fixedly connected between the anti-detachment ring (811) and the guide rail (731). The lower end of the pressing rod (81) presses against the top surface of the back plate (1).

4. The backplate loading device according to claim 3, characterized in that, The lower end of the pressure bar (81) is provided with a rubber head (82).

5. A backplate loading device according to claim 1, characterized in that, The rolling pressing member (41) is provided with a rotating strip (411). One end of the rotating strip (411) is rotatably connected to the end of the first limiting rod (4). The other end of the rotating strip (411) extends toward the back plate (1). The extended end of the rotating strip (411) is provided with a ball (412) that can roll into contact with the top surface of the back plate (1).

6. The backplate loading device according to claim 5, characterized in that, A second torsion spring (413) is fixedly connected between the rotating bar (411) and the first limiting rod (4). When the second torsion spring (413) is in normal state, the ball (412) is in contact with the top surface of the back plate (1).

7. A backplate loading device according to claim 5, characterized in that, A third electromagnet (4111) is fixed on the rotating bar (411), and a fourth electromagnet (4112) that cooperates with the third electromagnet (4111) is fixed on the first limiting rod (4). The rotating bar (411) is controlled to rotate along the axis of the first limiting rod (4) by the magnetic force between the third electromagnet (4111) and the fourth electromagnet (4112).

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