Aluminum material production film coating device

Abstract

The application relates to the technical field of aluminum materials, in particular to a film coating device for aluminum material production. The technical scheme comprises a front roller rolling on the top of the aluminum material, first supporting blocks are rotationally connected to the two ends of the front roller, first hydraulic rods are fixedly installed at the top of the first supporting blocks, a middle beam is fixedly connected to the top and the middle of the first hydraulic rods, and second hydraulic rods are communicated with the end portions of the first hydraulic rods through hydraulic pipes embedded in the middle beam. When the first supporting blocks are lifted upward by the aluminum material, the pressure plate frame is also lifted upward by the same height, the pressure plate frame drives the electric lifting rod, the second supporting blocks and the pressure roller to move upward, the initial height of the pressure roller can be changed, the height of the pressure roller is higher than that of the aluminum material, the film can be pressed downward by applying pressure, the aluminum material is coated with the film, the pressing height is adaptively adjusted according to aluminum materials with different thicknesses, and the film coating efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum technology, and more particularly to a coating apparatus for aluminum production. Background Technology

[0002] Aluminum coating equipment is used to coat the surface of aluminum materials with a thin film, effectively preventing oxidation and corrosion, improving surface quality and service life. Typically, a feeding device transports the aluminum material to the coating area, while the film is released from the roll. After tension control and alignment, the film adheres to the aluminum surface. Pressure rollers and other components apply pressure to ensure a tight bond between the film and the aluminum. Some coating machines may also include a heating function, which helps the film fuse better with the aluminum surface, enhancing the coating effect.

[0003] The patent document with publication number CN119550614A discloses a coating device for aluminum production. When coating polyethylene films of different widths, a moving mechanism drives a rack to move, which in turn drives a gear to rotate, thereby driving a rotating column to rotate. This rotates multiple pressure rollers, ensuring that the pressure rollers with the required coating width are positioned directly above the support rollers. This guarantees that the pressure rollers wear evenly during coating, resulting in uniform pressure when pressing the polyethylene film and preventing wrinkles, thus ensuring the coating effect on the aluminum material.

[0004] The aforementioned aluminum production coating device can only be used for aluminum materials of a fixed thickness. However, when the thickness of the aluminum material varies, the height of the pressure roller cannot be adaptively adjusted according to the thickness of the aluminum material, which affects the coating efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing a coating device for aluminum material production.

[0006] The technical solution of the present invention: A coating device for aluminum material production, comprising a production line frame, a central crossbeam fixedly installed on the top of the production line frame, and a roll for winding film rotatably connected to the inner wall of the central crossbeam, and further comprising:

[0007] The lifting mechanism includes a front roller that rolls on top of the aluminum material. Both ends of the front roller are rotatably connected to a first support block. A first hydraulic rod is fixedly installed on the top of the first support block. The top of the first hydraulic rod is fixedly connected to a middle crossbeam. The end of the first hydraulic rod is connected to a second hydraulic rod through a hydraulic pipe embedded inside the middle crossbeam. A support mechanism is provided at the bottom of the second hydraulic rod. A pressure roller that rolls on a film is provided at the bottom of the support mechanism.

[0008] The top of the second hydraulic rod is fixedly connected to the middle crossbeam, and a fine-tuning mechanism is provided at the bottom of the support mechanism.

[0009] Optionally, the spacing between the two first support blocks is the same as the left and right width of the assembly line frame, there is a gap between the first hydraulic rod and the second hydraulic rod, and the film on the roll passes through the gap between the first hydraulic rod and the second hydraulic rod and extends to the bottom of the pressure roller.

[0010] Optionally, the support mechanism includes a pressure plate frame, an electric lifting rod is fixedly installed at the bottom of the pressure plate frame, two symmetrically arranged second support blocks are fixedly installed at the bottom of the electric lifting rod, and the two ends of the pressure roller are rotatably connected to the sides of the second support blocks.

[0011] Optionally, the front roller and the pressure roller are parallel to each other, the distance between the two second support blocks is longer than the width of the film wound on the roll, and the second support blocks are misaligned with the aluminum material.

[0012] Optionally, the fine-tuning mechanism includes two vertical blocks fixedly installed at the bottom of the pressure plate frame. The vertical blocks are symmetrically arranged at the bottom of the pressure plate frame. A sliding groove is provided on the vertical block. A thin rod is slidably connected to the inside of the sliding groove. A pressing block is rotatably connected to the end of the thin rod. The pressing block slides up and down along the outer wall of the vertical block. Adjustment mechanisms are provided on both sides of the pressing block.

[0013] Optionally, the adjustment mechanism includes two expansion plates fixedly installed on both sides of the extrusion block, a clamping plate fixedly installed on the outer wall of the vertical block, a first airbag fixedly installed between the top of the expansion plate and the clamping plate, a second airbag fixedly installed on the outer wall of the vertical block, an air tube fixedly installed between the first airbag and the second airbag, a sliding switch slidably connected to the outer wall of the vertical block, the sliding switch being electrically connected to the electric lifting rod, and the sliding part of the sliding switch being fixedly connected to the second airbag.

[0014] Optionally, the second airbag has an elongated structure, the first airbag has a flat structure, and the horizontal cross-sectional area of ​​the second airbag is smaller than that of the first airbag.

[0015] Optionally, the top of the assembly line frame is provided with an alignment mechanism, which includes two support seats symmetrically arranged on the top of the assembly line frame. The two support seats are located on both sides of the aluminum material, and an electric push rod is fixedly installed on the opposite side of the two support seats. A support plate is fixedly installed at the end of the electric push rod.

[0016] Optionally, a spring telescopic rod is fixedly installed on the side of the support plate away from the electric push rod, and a centering plate is fixedly installed at the end of the spring telescopic rod.

[0017] Optionally, a track-like structure is provided on one side of the two center plates facing each other, and a pressure sensor is provided inside the spring telescopic rod, which is electrically connected to the electric push rod.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. This invention uses a first hydraulic rod with the same diameter as the second hydraulic rod. As the aluminum material lifts the first support block upwards, the pressure plate also rises to the same height. The pressure plate moves the electric lifting rod, the second support block, and the pressure roller upwards, thus changing the initial height of the pressure roller to be higher than the height of the aluminum material. This allows for downward pressure to be applied to press the film down, thereby coating the aluminum material. The downward pressure height is adaptively adjusted for aluminum materials of different thicknesses, improving coating efficiency.

[0020] 2. In this invention, the thin rod is lifted by the aluminum material and the film, and moves upward along the slide groove. The thin rod drives the extrusion block to move. Since the film thickness does not change significantly, the horizontal cross-sectional area of ​​the second airbag is smaller than that of the first airbag. The extrusion block drives the expansion plate to squeeze the first airbag. When the first airbag is squeezed, the gas inside it flows through the air tube into the second airbag. The second airbag expands and lifts the sliding switch upward. The sliding switch controls the extension length of the electric lifting rod through the controller. When the film thickness is thick, the extension length of the electric lifting rod is increased, i.e., the pressure is increased. When the film thickness is thin, the extension length of the electric lifting rod is shortened, reducing the pressure, to adapt to the film thickness on the aluminum material.

[0021] 3. In this invention, an electric push rod extends to move two centering plates toward the aluminum material. The two centering plates clamp the aluminum material to center it, ensuring a stable connection between the film and the aluminum material and preventing the film from tilting. At the same time, the spring telescopic rod acts as a buffer to prevent excessive compression. During the film coating process, the aluminum material moves with the production line frame, contacts the track, and moves, reducing the large friction between the centering plate and the aluminum material and preventing the aluminum material from being worn and producing burrs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a right-side view of the central crossbeam structure.

[0024] Figure 3 This is a schematic diagram of the roll structure;

[0025] Figure 4 This is a schematic diagram of the pressure roller structure;

[0026] Figure 5 for Figure 4 Schematic diagram of the second airbag structure in part A;

[0027] Figure 6 This is a schematic diagram of the support structure;

[0028] Figure 7 for Figure 6 Enlarged schematic diagram of the spring telescopic rod structure in part B.

[0029] Reference numerals: 1. Assembly line frame; 2. Central crossbeam; 3. Drum; 4. Lifting mechanism; 41. Front roller; 42. First support block; 43. First hydraulic rod; 44. Second hydraulic rod; 45. Pressure plate frame; 46. Electric lifting rod; 47. Second support block; 48. Pressure roller; 5. Fine-tuning mechanism; 51. Vertical block; 52. Slide groove; 53. Thin rod; 54. Extrusion block; 55. Expansion plate; 56. First airbag; 57. Air pipe; 58. Second airbag; 59. Sliding switch; 6. Alignment mechanism; 61. Support seat; 62. Electric push rod; 63. Support plate; 64. Spring telescopic rod; 65. Centering plate. Detailed Implementation

[0030] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0032] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Example: The present invention proposes an aluminum material coating device, such as... Figure 1 As shown, the assembly line includes a frame 1, a central crossbeam 2 is fixedly installed on the top of the frame 1, and a roll 3 for winding film is rotatably connected to the inner wall of the central crossbeam 2. Aluminum materials are conveyed through the assembly line 1, and the film on the roll 3 is attached to the aluminum materials.

[0036] like Figures 1 to 4 As shown, the top of the assembly line frame 1 is provided with a lifting mechanism 4. The lifting mechanism 4 includes a front roller 41 that rolls on the top of the aluminum material. Both ends of the front roller 41 are rotatably connected to a first support block 42. A first hydraulic rod 43 is fixedly installed on the top of the first support block 42. The top of the first hydraulic rod 43 is fixedly connected to the middle crossbeam 2. The end of the first hydraulic rod 43 is connected to a second hydraulic rod 44 through a hydraulic pipe embedded inside the middle crossbeam 2. The top of the second hydraulic rod 44 is fixedly connected to the middle crossbeam 2.

[0037] The distance between the two first support blocks 42 is the same as the left and right width of the assembly line frame 1. There is a gap between the first hydraulic rod 43 and the second hydraulic rod 44. During the process of conveying aluminum material through the assembly line frame 1, the aluminum material pushes up the first support block 42. The first support block 42 pushes the first hydraulic rod 43 upward using the front roller 41. The first hydraulic rod 43 draws out the hydraulic oil in the second hydraulic rod 44, thereby causing the second hydraulic rod 44 to retract.

[0038] The bottom of the second hydraulic rod 44 is provided with a support mechanism, and the bottom of the support mechanism is provided with a pressure roller 48 that rolls on the film. The support mechanism includes a pressure plate frame 45, and an electric lifting rod 46 is fixedly installed at the bottom of the pressure plate frame 45. Two symmetrically arranged second support blocks 47 are fixedly installed at the bottom of the electric lifting rod 46. The two ends of the pressure roller 48 are rotatably connected to the sides of the second support blocks 47. The diameter of the first hydraulic rod 43 is the same as the diameter of the second hydraulic rod 44. The height to which the first hydraulic rod 43 is pushed upward is the height to which the second hydraulic rod 44 is contracted, that is, the rising height of the pressure roller 48 is the same as the rising height of the first support block 42. The first hydraulic rod 43 and the second hydraulic rod 44 adopt a passive series hydraulic cylinder position synchronization circuit to achieve synchronous extension and retraction of the first hydraulic rod 43 and the second hydraulic rod 44.

[0039] The front roller 41 and the pressure roller 48 are parallel to each other. The distance between the two second support blocks 47 is longer than the width of the film wound on the roll 3. The second support blocks 47 are misaligned with the aluminum material and are pushed upward by the first hydraulic rod 43. The hydraulic oil in the second hydraulic rod 44 is drawn into the first hydraulic rod 43. The second hydraulic rod 44 retracts and raises the height of the pressure plate frame 45. The pressure plate frame 45 drives the electric lifting rod 46, the second support blocks 47 and the pressure roller 48 to move upward, which can change the initial height of the pressure roller 48 so that the height of the pressure roller 48 is higher than the height of the aluminum material.

[0040] This invention utilizes the fact that the diameter of the first hydraulic rod 43 is the same as the diameter of the second hydraulic rod 44. Simultaneously, as the aluminum material lifts the first support block 42 upwards, the pressure plate frame 45 also rises to the same height. The pressure plate frame 45 drives the electric lifting rod 46, the second support block 47, and the pressure roller 48 to move upwards, thereby changing the initial height of the pressure roller 48. This makes the height of the pressure roller 48 higher than the height of the aluminum material, allowing downward pressure to be applied to press the film down, thus coating the aluminum material. The invention adaptively adjusts the downward pressure height for aluminum materials of different thicknesses, improving coating efficiency.

[0041] As one implementation method, such as Figure 4 and Figure 5 The bottom of the support mechanism is provided with a fine adjustment mechanism 5. The fine adjustment mechanism 5 includes two vertical blocks 51 fixedly installed at the bottom of the pressure plate frame 45. Two vertical blocks 51 are provided and symmetrically arranged at the bottom of the pressure plate frame 45. A sliding groove 52 is provided on the vertical block 51. A thin rod 53 is slidably connected to the inside of the sliding groove 52. The end of the thin rod 53 is rotatably connected to a pressing block 54. The pressing block 54 slides up and down along the outer wall of the vertical block 51. Adjustment mechanisms are provided on both sides of the pressing block 54.

[0042] Since the film has a certain thickness, films of different thicknesses require corresponding pressure in order to make the film completely adhere to the aluminum material. First, the pressure roller 48 rises to the height of the aluminum material, and then the thin rod 53 is lifted by the aluminum material and the film. The thin rod 53 moves upward along the slide 52, and the thin rod 53 drives the extrusion block 54 to move. The extrusion block 54 drives the adjustment mechanism to move upward.

[0043] The adjustment mechanism includes two expansion plates 55 fixedly installed on both sides of the extrusion block 54, a clamping plate fixedly installed on the outer wall of the vertical block 51, a first airbag 56 fixedly installed between the top of the expansion plate 55 and the clamping plate, a second airbag 58 fixedly installed on the outer wall of the vertical block 51, an air tube 57 fixedly installed between the first airbag 56 and the second airbag 58, a sliding switch 59 slidably connected to the outer wall of the vertical block 51, the sliding switch 59 being electrically connected to the electric lifting rod 46, and the sliding part of the sliding switch 59 being fixedly connected to the second airbag 58.

[0044] The sliding switch 59 is a sliding rheostat in the prior art. The position of the slider of the sliding switch 59 determines the resistance value, thereby controlling the speed of the electric lifting rod 46 motor. Under the condition that the energizing time of the electric lifting rod 46 remains unchanged, the extension length of the electric lifting rod 46 is affected by the sliding switch 59.

[0045] In the prior art, the electric lifting rod 46 has its own motor. The compression block 54 drives the extension plate 55 to compress the first airbag 56. When the first airbag 56 is compressed, the gas inside it flows through the air pipe 57 and into the second airbag 58. The second airbag 58 expands and pushes the sliding part of the sliding switch 59 upward. The sliding switch 59 controls the extension length of the electric lifting rod 46 through the controller.

[0046] When the film is thicker, the sliding part of the sliding switch 59 moves a longer distance, thereby reducing the resistance and increasing the motor speed of the electric lifting rod 46. Under the condition of constant time, the extension length of the electric lifting rod 46 is increased, that is, the pressure is increased.

[0047] When the film thickness is thin, the sliding part of the sliding switch 59 moves a short distance, thereby increasing the resistance and reducing the motor speed of the electric lifting rod 46. Under the condition of constant time, the extension length of the electric lifting rod 46 is shortened, reducing the pressure.

[0048] It is worth noting that, since the thickness of the film does not change significantly, the second airbag 58 adopts a slender structure, while the first airbag 56 adopts a flat structure. The horizontal cross-sectional area of ​​the second airbag 58 is smaller than that of the first airbag 56. The first airbag 56 is compressed over a shorter distance, but its compressed area is larger. Furthermore, the second airbag 58 is slender, so the amount of gas transferred into the second airbag 58 is visible to the naked eye, allowing the sliding switch 59 to move and adjust the extension length of the electric lifting rod 46.

[0049] In this invention, the thin rod 53 is lifted by the aluminum material and the film, and moves upward along the slide groove 52. The thin rod 53 drives the extrusion block 54 to move. Since the film thickness does not change significantly, the horizontal cross-sectional area of ​​the second airbag 58 is smaller than that of the first airbag 56. The extrusion block 54 drives the expansion plate 55 to extrude the first airbag 56. When the first airbag 56 is extruded, the gas inside it flows into the second airbag 58 through the air pipe 57. The second airbag 58 expands and lifts the sliding switch 59 upward. The sliding switch 59 controls the extension length of the electric lifting rod 46 through the controller. When the film thickness is thick, the extension length of the electric lifting rod 46 is increased, i.e., the pressure is increased. When the film thickness is thin, the extension length of the electric lifting rod 46 is shortened, reducing the pressure, to adapt to the film thickness on the aluminum material.

[0050] As one implementation method, such as Figure 6 and Figure 7As shown, the top of the assembly line frame 1 is provided with an alignment mechanism 6. The alignment mechanism 6 includes two support seats 61 symmetrically arranged on the top of the assembly line frame 1. The two support seats 61 are located on both sides of the aluminum material. An electric push rod 62 is fixedly installed on the side of the two support seats 61 facing each other. A support plate 63 is fixedly installed at the end of the electric push rod 62. A spring telescopic rod 64 is fixedly installed on the side of the support plate 63 away from the electric push rod 62. A centering plate 65 is fixedly installed at the end of the spring telescopic rod 64.

[0051] The extension of the electric push rod 62 moves the two centering plates 65 toward the aluminum material, clamping it in place. A spring-loaded telescopic rod 64 acts as a buffer to prevent excessive compression. A pressure sensor is installed inside the spring-loaded telescopic rod 64 and is electrically connected to the electric push rod 62. When the pressure sensor detects excessive pressure from the centering plates 65 on the aluminum material, it transmits the data to the controller, which then stops the extension of the electric push rod 62.

[0052] A track-like structure is provided on one side of the two center plates 65 facing each other. As the aluminum material moves with the production line frame 1 during the coating process, the aluminum material contacts and moves with the track, reducing the large friction between the center plate 65 and the aluminum material.

[0053] This invention uses an electric push rod 62 to extend and move two centering plates 65 toward the aluminum material. The two centering plates 65 clamp the aluminum material and center it, ensuring a stable connection between the film and the aluminum material and preventing the film from tilting. At the same time, the spring telescopic rod 64 acts as a buffer to prevent excessive compression. During the film coating process, the aluminum material moves with the production line frame 1, contacts the track and moves, reducing the large friction between the centering plate 65 and the aluminum material and preventing the aluminum material from being worn and producing burrs.

[0054] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An aluminum material production coating apparatus, comprising a production line frame (1), wherein a central crossbeam (2) is fixedly installed on the top of the production line frame (1), and a roll (3) for winding film is rotatably connected to the inner wall of the central crossbeam (2), characterized in that, Also includes: The lifting mechanism (4) includes a front roller (41) that rolls on top of the aluminum material. Both ends of the front roller (41) are rotatably connected to a first support block (42). A first hydraulic rod (43) is fixedly installed on the top of the first support block (42). The top of the first hydraulic rod (43) is fixedly connected to the middle crossbeam (2). The end of the first hydraulic rod (43) is connected to a second hydraulic rod (44) through a hydraulic pipe embedded in the middle crossbeam (2). A support mechanism is provided at the bottom of the second hydraulic rod (44). A pressure roller (48) that rolls on the film is provided at the bottom of the support mechanism. The diameter of the first hydraulic rod (43) is the same as the diameter of the second hydraulic rod (44). The first hydraulic rod (43) and the second hydraulic rod (44) extend and retract synchronously. The support mechanism includes a pressure plate frame (45), an electric lifting rod (46) is fixedly installed at the bottom of the pressure plate frame (45), two symmetrically arranged second support blocks (47) are fixedly installed at the bottom of the electric lifting rod (46), and the two ends of the pressure roller (48) are rotatably connected to the sides of the second support blocks (47). The top end of the second hydraulic rod (44) is fixedly connected to the middle crossbeam (2), and the bottom of the support mechanism is provided with a fine-tuning mechanism (5). The fine-tuning mechanism (5) includes a vertical block (51) fixedly installed at the bottom of the pressure plate frame (45). Two vertical blocks (51) are provided and symmetrically arranged at the bottom of the pressure plate frame (45). A sliding groove (52) is provided on the vertical block (51). A thin rod (53) is slidably connected to the inside of the sliding groove (52). A pressing block (54) is rotatably connected to the end of the thin rod (53). The pressing block (54) slides up and down along the outer wall of the vertical block (51). Adjustment mechanisms are provided on both sides of the pressing block (54). The adjustment mechanism includes two expansion plates (55) fixedly installed on both sides of the extrusion block (54), a clamping plate fixedly installed on the outer wall of the vertical block (51), a first airbag (56) fixedly installed between the top of the expansion plate (55) and the clamping plate, a second airbag (58) fixedly installed on the outer wall of the vertical block (51), an air tube (57) fixedly installed between the first airbag (56) and the second airbag (58), a sliding switch (59) slidably connected to the outer wall of the vertical block (51), the sliding switch (59) being electrically connected to the electric lifting rod (46), and the sliding part of the sliding switch (59) being fixedly connected to the second airbag (58); the sliding switch (59) controls the extension length of the electric lifting rod (46) through a controller; The second airbag (58) has a slender structure, while the first airbag (56) has a flat structure. The horizontal cross-sectional area of ​​the second airbag (58) is smaller than that of the first airbag (56).

2. The aluminum material production coating apparatus according to claim 1, characterized in that, The distance between the two first support blocks (42) is the same as the left and right width of the assembly line frame (1), there is a gap between the first hydraulic rod (43) and the second hydraulic rod (44), and the film on the roll (3) passes through the first hydraulic rod (43) and the second hydraulic rod (44) and extends to the bottom of the pressure roller (48).

3. The aluminum material production coating apparatus according to claim 2, characterized in that, The front roller (41) and the pressure roller (48) are parallel to each other, the distance between the two second support blocks (47) is longer than the width of the film wound on the roll (3), and the second support block (47) is misaligned with the aluminum material.

4. The aluminum material production coating apparatus according to claim 3, characterized in that, The assembly line frame (1) is provided with an alignment mechanism (6) at its top. The alignment mechanism (6) includes two support seats (61) symmetrically arranged at the top of the assembly line frame (1). The two support seats (61) are located on both sides of the aluminum material. An electric push rod (62) is fixedly installed on the opposite side of the two support seats (61). A support plate (63) is fixedly installed at the end of the electric push rod (62).

5. The aluminum material production coating apparatus according to claim 4, characterized in that, A spring telescopic rod (64) is fixedly installed on the side of the support plate (63) away from the electric push rod (62), and a centering plate (65) is fixedly installed at the end of the spring telescopic rod (64).

6. The aluminum material production coating apparatus according to claim 5, characterized in that, The two center plates (65) are provided with a track-like structure on one side facing each other. The spring telescopic rod (64) is provided with a pressure sensor inside, and the pressure sensor is electrically connected to the electric push rod (62).

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