A shearing guide device for plastic packaging bags

Abstract

The present invention relates to the technical field of plastic bag processing, and discloses a shearing guide device for plastic packaging bags, comprising a front crossbeam 1, a guide portion 4 being provided on the front crossbeam 1 for guiding a flattening tool to contact or stay away from stacked plastic bags, the guide portion 4 comprising an L-shaped arm 41, the bottom end of the L-shaped arm 41 being fixedly connected to the top of one end of the front crossbeam 1, the top of the L-shaped arm 41 being fixedly connected to a sliding sleeve 42, a guide groove 44 being provided at the top of the L-shaped arm 41, the guide groove 44 being located in the sliding sleeve 42, a tension portion 5 being provided on the guide portion 4 for providing tension and flattening the surface of the stacked plastic bags, the device adopts a gear rack mechanism driven by a motor of the guide portion, so that a roller applies adjustable tension to the free side of the plastic bag, forming a dynamic balance with the unilateral pressure of the clamping portion, effectively offsetting the nonlinear stress field inside the stack, reducing the relative slip between layers, and solving the dislocation problem caused by excessive shear stress on the free side.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bag processing, in particular to a shearing guide device for plastic packaging bags. Background Art

[0002] In automated plastic bag production systems, the stacked continuous cutting process is a key step affecting product quality. Existing technology typically uses a single-sided clamp to secure the stacked bags and transport them along a smooth workbench to the shearing station. When the clamp applies normal pressure only on one side of the stack, leaving the other side free, the shear force creates a nonlinear stress field within the stack. The shear stress on the free side is higher than on the clamped side, causing relative slip between the layers.

[0003] Flexible materials such as low-density polyethylene are prone to micro-curling at unconstrained edges, resulting in deviation in the inclination angle of the cutting plane. When the rotating knife roller or reciprocating cutter contacts the material, the instantaneous pressure will induce elastic compression in the thickness direction of the stack. After the cutter leaves, the inconsistent rebound causes misalignment between layers. The cutting force forms shear waves in the material, and the amplitude on the free side is higher than that on the clamping side, exacerbating the formation of wrinkles.

[0004] Existing technologies use grooves or vacuum suction on the worktable surface, but these methods fail to address the stress concentration problem during dynamic cutting. Consequently, during high-speed cutting, verticality errors increase, leading to a higher defective rate. Therefore, a shearing guide device for plastic packaging bags is proposed to address this issue. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides a shearing guide device for plastic packaging bags, which solves the problem that stacked plastic bags are affected by the clamps, and the free sides are easily curled, dislocated and wrinkled when cutting, resulting in errors in the cut of each plastic bag and reduced processing accuracy.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a shearing guide device for plastic packaging bags, comprising a front crossbeam, a guide portion being provided on the front crossbeam, the guide portion comprising an L-shaped arm, the bottom end of the L-shaped arm being fixedly connected to the top of one end of the front crossbeam, the top of the L-shaped arm being fixedly connected to a sliding sleeve, the top of the L-shaped arm being provided with a guide groove, the guide groove being located in the sliding sleeve, a tension portion being provided on the guide portion, the tension portion comprising a rack, the rack being slidably connected between the sliding sleeve and the guide groove, the tooth mouth of the rack facing downward, the sliding sleeve, guide groove and rack being all inclined in the same axial direction, the end of the rack being fixedly connected to a rotating sleeve, the inner wall of the rotating sleeve being rotatably connected to one end of a roller.

[0009] Preferably, the guide portion also includes a sliding hole, which is opened on one side of the sliding sleeve, and a through hole is opened on the inner wall of the guide groove. The side of the L-shaped support arm is fixedly connected to an organic baffle, and a motor is installed on the machine baffle. A gear is fixedly sleeved on the output shaft of the motor, and the gear is movably arranged in the through hole. The other side of the L-shaped support arm is fixedly connected to a guide plate, and the guide plate has an obtuse angle structure and is arranged at an angle.

[0010] Preferably, there are two guide parts, the bottom end of the L-shaped arm in the other guide part is fixedly connected to the top of the other end of the front crossbeam, and the two guide parts are symmetrically arranged with each other.

[0011] Preferably, there are two racks and two rotating sleeves, the other rack is slidably connected to the sliding sleeve in the other guide part, the other end of the roller is rotatably connected to the inner wall of the other rotating sleeve, and the two racks are respectively engaged with the gears on the same side.

[0012] Preferably, the rack is provided with an anti-folding portion, and the anti-folding portion includes a connecting rod 1 and a connecting rod 2, and the connecting rod 1 and the connecting rod 2 are both fixedly connected to the side of the rack, and an anti-rock plate is provided on the connecting rod 2, and a telescopic rod is rotatably sleeved on the connecting rod 1, and an arc piece is fixedly connected to the anti-rock plate, and a connecting disk is hinged on the arc piece, and the inner rod of the telescopic rod is fixedly connected to the connecting disk, and a spring is elastically connected between the outer rod of the telescopic rod and the connecting disk.

[0013] Preferably, the anti-rock plate is a U-shaped structure, and both ear ends of the anti-rock plate are inclined. One ear end of the anti-rock plate is rotatably mounted on connecting rod 2, and the other ear end of the anti-rock plate has the same inclination angle as the end of the guide plate.

[0014] Preferably, there are two anti-pleat portions, another anti-pleat portion is mounted on the other side of the rack, and the two anti-pleat portions are symmetrically arranged with respect to each other.

[0015] Preferably, the two anti-rocking plates in the two anti-folding parts are respectively aligned with the guide plates on the same side, and the connecting rod 1 and the connecting rod 2 in each anti-folding part are respectively aligned with the sliding holes on the same side.

[0016] Preferably, movable sliders are symmetrically installed at both ends of the front crossbeam, and a clamping part is provided on the movable slider, and the clamping part includes a rotating rod, and the rotating rod is fixedly connected between the two movable sliders. A clamp is installed on the rotating rod, and the bottom surface of the end of the clamp is fixedly connected to a pressure head, and the bottom of the front crossbeam is fixedly connected to a pressure plate corresponding to the pressure head, and a hinge piece is fixedly sleeved on the middle part of the outer wall of the rotating rod, and a hinge block is hinged on the hinge piece, and an electric push rod is provided on the hinge block, and the movable end of the electric push rod is fixedly connected to the hinge block.

[0017] Preferably, a mounting portion is provided on the movable slider, and the mounting portion includes a rear cross beam, a rod hole is opened in the middle of the top of the rear cross beam, the movable end of the electric push rod is movably arranged on the inner wall of the rod hole, three reinforcement plates are fixedly connected to the back side of the rear cross beam, and brackets are fixedly connected to the three reinforcement plates, a support block is installed on the bracket, and the electric push rod is installed on the support block.

[0018] (3) Beneficial effects

[0019] Compared with the prior art, the present invention provides a shearing guide device for plastic packaging bags, which has the following beneficial effects:

[0020] 1. The shear guide device of the plastic packaging bag adopts a gear rack mechanism driven by the motor of the guide part, so that the roller applies adjustable tension to the free side of the plastic bag, forming a dynamic balance with the unilateral pressure of the clamping part, effectively offsetting the nonlinear stress field inside the stack, reducing the relative slip between layers, and solving the dislocation problem caused by excessive shear stress on the free side.

[0021] 2. The shearing guide device of the plastic packaging bag adopts the anti-wake plate of the anti-fold part to cooperate with the guide plate through the inclined ear end, so as to slightly curl and flatten the free side edge of the plastic bag before cutting. Combined with the elastic support structure of the arc piece and the telescopic rod, it can adaptively adapt to the edge characteristics of different materials, reduce the deviation of the inclination angle of the cutting plane, and improve the verticality accuracy of the incision.

[0022] 3. The shear guide device of the plastic packaging bag adopts a spring and telescopic rod combination in the anti-fold part to absorb the shear wave energy generated during cutting in real time. The hinged structure of the anti-rocker plate allows a small swing, which reduces the amplitude of the free side and effectively suppresses the formation of wrinkles caused by inconsistent elastic compression and rebound during the cutting process, thereby improving the qualified rate of incision error.

[0023] 4. The shearing guide device for plastic packaging bags uses a motor-driven tension unit that can dynamically adjust the roller pressure through torque sensor feedback. Combined with the elastic flattening mechanism of the anti-pleat unit, it can be compatible with stacks of plastic bags of different thicknesses and different elastic moduli without human intervention, solving the problem of traditional fixed pressure clamps being sensitive to material properties.

[0024] 5. The shearing guide device of the plastic packaging bag adopts a method in which after cutting, the rack drives the anti-warp plate to rise obliquely along the guide plate. Through the composite trajectory of vertical and oblique movement, it avoids excessive extrusion and friction with the surface of the plastic bag. At the same time, the detachable anti-pleat structure facilitates cleaning and maintenance, reduces the risk of mechanical jamming due to dust accumulation, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a shearing guide device for plastic packaging bags proposed by the present invention;

[0026] Figure 2 This is a connection diagram of the clamping part and the mounting part of a shearing guide device for plastic packaging bags proposed by the present invention;

[0027] Figure 3 This is a connection diagram of the guide part and the tension part of a shearing guide device for plastic packaging bags proposed by the present invention;

[0028] Figure 4 Axial view of the guide portion of a shearing guide device for a plastic packaging bag proposed by the present invention Figure 1 ;

[0029] Figure 5 Axial view of the guide portion of a shearing guide device for a plastic packaging bag proposed by the present invention Figure 2 ;

[0030] Figure 6 This is a connection diagram of the tension part and the anti-pleat part of the shear guide device of the plastic packaging bag proposed by the present invention;

[0031] Figure 7 A shearing guide device for plastic packaging bags proposed by the present invention Figure 6 A magnified view of center.

[0032] In the figure: 1. Front crossbeam; 2. Moving slider; 3. Clamping part; 31. Rotating rod; 32. Clamp; 33. Pressure head; 34. Pressure plate; 35. Hinge plate; 36. Hinge block; 37. Electric push rod; 4. Guide part; 41. L-shaped support arm; 42. Sliding sleeve; 43. Sliding hole; 44. Guide groove; 45. Through hole; 46. Machine baffle; 47. Motor; 48. Gear; 49. Guide plate; 5. Tension part; 51. Rack; 52. Rotating sleeve; 53. Rotating roller; 6. Anti-folding part; 61. Connecting rod 1; 62. Connecting rod 2; 63. Anti-rocking plate; 64. Telescopic rod; 65. Arc plate; 66. Connecting plate; 67. Spring; 7. Mounting part; 71. Rear crossbeam; 72. Reinforcement plate; 73. Bracket. DETAILED DESCRIPTION

[0033] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] See also Figure 1-7 The present invention provides a technical solution: a shearing guide device for plastic packaging bags, comprising a front crossbeam 1, a guide portion 4 is provided on the front crossbeam 1, for guiding the flattening tool to contact or move away from the stacked plastic bags, the guide portion 4 comprises an L-shaped arm 41, the bottom end of the L-shaped arm 41 is fixedly connected to the top of one end of the front crossbeam 1, the top of the L-shaped arm 41 is fixedly connected to a sliding sleeve 42, the top of the L-shaped arm 41 is provided with a guide groove 44, the guide groove 44 is located in the sliding sleeve 42, a tensioning portion 5 is provided on the guide portion 4, for providing tension and flattening the surface of the stacked plastic bags, the tensioning portion 5 comprises a rack 51, the rack 51 is slidably connected between the sliding sleeve 42 and the guide groove 44, the teeth of the rack 51 face downward, the sliding sleeve 42, the guide groove 44 and the rack 51 are all inclined in the same axial direction, the end of the rack 51 is fixedly connected to a rotating sleeve 52, and the inner wall of the rotating sleeve 52 is rotatably connected to one end of a roller 53.

[0035] In this embodiment, the guide part 4 also includes a sliding hole 43, which is opened on one side of the sliding sleeve 42, and a through hole 45 is opened on the inner wall of the guide groove 44. The side of the L-shaped arm 41 is fixedly connected to the organic baffle 46, and a motor 47 is installed on the organic baffle 46. A gear 48 is fixedly sleeved on the output shaft of the motor 47, and the gear 48 is movably arranged in the through hole 45. The other side of the L-shaped arm 41 is fixedly connected to a guide plate 49, which has an obtuse angle structure and is tilted. There are two guide parts 4, and the bottom end of the L-shaped arm 41 in the other guide part 4 is fixedly connected to the top of the other end of the front crossbeam 1. The two guide parts 4 are symmetrically arranged with each other. There are two racks 51 and two rotating sleeves 52. The other rack 51 is slidably connected to the sliding sleeve 42 in the other guide part 4, and the other end of the roller 53 is rotatably connected to the inner wall of the other rotating sleeve 52. The two racks 51 are respectively engaged with the gear 48 on the same side.

[0036] It is worth noting that the rack 51 is provided with an anti-pleat portion 6, which is used to adaptively press the two sides of the flattened plastic bag to prevent shearing and rebounding. The anti-pleat portion 6 includes a connecting rod 1 61 and a connecting rod 2 62. The connecting rod 1 61 and the connecting rod 2 62 are both fixedly connected to the side of the rack 51. An anti-rocking plate 63 is provided on the connecting rod 2 62. A telescopic rod 64 is rotatably provided on the connecting rod 1 61. An arc piece 65 is fixedly connected to the anti-rocking plate 63. A connecting plate 66 is hinged on the arc piece 65. The inner rod of the telescopic rod 64 is fixedly connected to the connecting plate 66. The outer rod of the telescopic rod 64 is elastically connected to the connecting plate 66. Spring 67, the anti-rock plate 63 is a U-shaped structure, and the two ear ends of the anti-rock plate 63 are both tilted. One ear end of the anti-rock plate 63 is rotatably mounted on the connecting rod 2 62, and the other ear end of the anti-rock plate 63 has the same inclination angle as the end of the guide plate 49. There are two anti-fold parts 6, and the other anti-fold part 6 is installed on the side of the other rack 51. The two anti-fold parts 6 are symmetrically arranged with each other, and the two anti-rock plates 63 in the two anti-fold parts 6 are respectively aligned with the guide plate 49 on the same side, and the connecting rod 1 61 and the connecting rod 2 62 in each anti-fold part 6 are respectively aligned with the sliding hole 43 on the same side.

[0037] It is worth noting that movable sliders 2 are symmetrically installed at both ends of the front crossbeam 1. The movable sliders 2 are used to connect the linear motors on both sides of the shearing table to perform reciprocating loading and unloading operations. A clamping part 3 is provided on the movable slider 2 for normally clamping and pulling the stacked plastic bags. The clamping part 3 includes a rotating rod 31, which is fixedly connected between the two movable sliders 2. A clamp 32 is installed on the rotating rod 31. The bottom surface of the end of the clamp 32 is fixedly connected to a pressure head 33. The bottom of the front crossbeam 1 is fixedly connected to a pressure plate 34 corresponding to the pressure head 33. The middle of the outer wall of the rotating rod 31 is fixed The fixed sleeve is provided with a hinge piece 35, a hinge block 36 is hinged on the hinge piece 35, an electric push rod 37 is provided on the hinge block 36, the movable end of the electric push rod 37 is fixedly connected to the hinge block 36, and a mounting portion 7 is provided on the movable slider 2. The mounting portion 7 includes a rear cross beam 71, and a rod hole is provided in the middle of the top of the rear cross beam 71. The movable end of the electric push rod 37 is movably arranged on the inner wall of the rod hole. Three reinforcing plates 72 are fixedly connected to the back of the rear cross beam 71, and brackets 73 are fixedly connected to the three reinforcing plates 72. A support block is installed on the bracket 73, and the electric push rod 37 is installed on the support block.

[0038] Working principle: the moving slider 2 is driven by a linear motor, driving the clamping part 3 to move above the stacked plastic bags. The electric push rod 37 extends and drives the rotating rod 31 to rotate through the hinge piece 35 and the hinge block 36, so that the pressure head 33 of the clamp 32 presses one side of the plastic bag, such as the left side, and cooperates with the pressure plate 34 to form a single-sided fixation, which is similar to the single-sided pneumatic clamp of South Korea's SUNGILMACHINERY, but the pressure is dynamically adjustable through the electric push rod 37 to adapt to stacks of different thicknesses.

[0039] The motor 47 on the machine baffle 46 is started, driving the gear 48 to rotate. Since the gear 48 is engaged with the rack 51, and the sliding sleeve 42, the guide groove 44 and the rack 51 are all inclined, the rack 51 slides downward in an oblique direction, driving the roller 53 to press toward the free side of the plastic bag, such as the right side. The speed of the motor 47 determines the moving speed of the rack 51, thereby controlling the pressure of the roller 53 on the free side, which can be adjusted through feedback from the torque sensor to form a tension balance with the clamping side.

[0040] When the rack 51 moves, the anti-rock plate 63 of the anti-pleat portion 6 moves obliquely with the rack 51, and its inclined ear end contacts the free side edge of the plastic bag. Through the elastic support of the connecting rod 61 and the telescopic rod 64, the edge is slightly curled and flattened. When the material of the plastic bag changes, the telescopic rod 64 automatically adjusts the flattening force through the spring 67 to avoid excessive extrusion and material deformation. The hinged structure of the arc piece 65 and the connecting plate 66 allows the anti-rock plate 63 to swing slightly with the fluctuation of the cutting force, absorb the shear wave energy generated during cutting, and reduce the amplitude of the free side.

[0041] The cutting adopts the shearing device in the plastic bag processing machinery of the prior art. The plastic bag is dragged to the bottom of the shearing device, and the roller 53 moves to beyond the free side of the plastic bag. At this time, the plastic bag is still pressed by the anti-rock plate 63, and the free side of the plastic bag will not be hindered during shearing, so as to achieve normal plastic bag opening cutting. After the cutting is completed, the motor 47 reverses, and the rack 51 slides upward along the guide groove 44. The roller 53 disengages from the free side of the plastic bag. At the same time, the ear end of the anti-rock plate 63 preferentially contacts the obtuse angled end of the guide plate 49, thereby prompting the anti-rock plate 63 to rise along the guide plate 49. At this time, the rise of the rack 51 drives the anti-rock plate 63 to rise synchronously, prompting the anti-rock plate 63 to produce two synchronous movements of vertical rise and oblique rise, thereby realizing the anti-rock plate 63 away from the surface of the stacked plastic bags, without excessive squeezing and damaging the plastic bags. At the same time, under the action of the spring 67, the telescopic rod 64 contracts and flips back to reset.

[0042] After resetting, the roller 53 is suspended above the clamp 32, the electric push rod 37 is retracted, the rotating rod 31 rotates in the opposite direction, the clamp 32 is lifted, and a cutting cycle is completed. The stacked body is transported to the next station by the conveyor belt.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

Claims

1. A shearing guide device for plastic packaging bags, comprising a front crossbeam (1), characterized in that: The front cross beam (1) is provided with a guide portion (4), the guide portion (4) includes an L-shaped support arm (41), the bottom end of the L-shaped support arm (41) is fixedly connected to the top of one end of the front cross beam (1), the top of the L-shaped support arm (41) is fixedly connected to a sliding sleeve (42), the top of the L-shaped support arm (41) is provided with a guide groove (44), the guide groove (44) is located in the sliding sleeve (42), the other side of the L-shaped support arm (41) is fixedly connected to a guide plate (49), the guide plate (49) is an obtuse angle structure and is tilted; The two ends of the front cross beam (1) are symmetrically provided with movable sliders (2), the movable slider (2) is provided with a clamping part (3), the clamping part (3) includes a rotating rod (31), the rotating rod (31) is fixedly connected between the two movable sliders (2), a clamp (32) is installed on the rotating rod (31), the bottom surface of the end of the clamp (32) is fixedly connected with a pressure head (33), the bottom of the front cross beam (1) is fixedly connected with a pressure plate (34) corresponding to the pressure head (33), a hinge piece (35) is fixedly sleeved on the middle part of the outer wall of the rotating rod (31), a hinge block (36) is hinged on the hinge piece (35), an electric push rod (37) is provided on the hinge block (36), and the movable end of the electric push rod (37) is fixedly connected to the hinge block (36); The guide portion (4) is provided with a tension portion (5), and the tension portion (5) includes a rack (51), and the rack (51) is slidably connected between the sliding sleeve (42) and the guide groove (44), and the tooth opening of the rack (51) faces downward, and the sliding sleeve (42), the guide groove (44) and the rack (51) are all tilted in the same axial direction, and the end of the rack (51) is fixedly connected to the rotating sleeve (52), and the inner wall of the rotating sleeve (52) is rotatably connected to one end of the roller (53), and the number of the rack (51) and the number of the rotating sleeve (52) are two each; The rack (51) is provided with an anti-folding portion (6), the anti-folding portion (6) includes a connecting rod (61) and a connecting rod (62), the connecting rod (61) and the connecting rod (62) are both fixedly connected to the side of the rack (51), the connecting rod (62) is provided with an anti-sway plate (63), a telescopic rod (64) is rotatably sleeved on the connecting rod (61), the anti-sway plate (63) is fixedly connected with an arc plate (65), the arc plate (65) is hinged with a connecting disk (66), the inner rod of the telescopic rod (64) is fixedly connected to the connecting disk (66), and a spring (67) is elastically connected between the outer rod of the telescopic rod (64) and the connecting disk (66); The anti-sway plate (63) is a U-shaped structure. Both ear ends of the anti-sway plate (63) are tilted. One ear end of the anti-sway plate (63) is rotatably sleeved on the second connecting rod (62). The other ear end of the anti-sway plate (63) has the same tilt angle as the end of the guide plate (49). There are two guide parts (4) and two anti-fold parts (6). Another anti-fold part (6) is installed on the side of another rack (51). The two anti-fold parts (6) are symmetrically arranged with each other. The two anti-tilt plates (63) in the two anti-fold parts (6) are respectively aligned with the guide plate (49) on the same side.

2. A shearing guide device for plastic packaging bags according to claim 1, characterized in that: The guide portion (4) further comprises a sliding hole (43), the sliding hole (43) being opened on one side of the sliding sleeve (42), a through hole (45) being opened on the inner wall of the guide groove (44), a side surface of the L-shaped support arm (41) being fixedly connected to an organic baffle (46), a motor (47) being mounted on the organic baffle (46), a gear (48) being fixedly sleeved on the output shaft of the motor (47), and the gear (48) being movably arranged in the through hole (45).

3. The shearing guide device for plastic packaging bags according to claim 2, characterized in that: The bottom end of the L-shaped support arm (41) in the other guide portion (4) is fixedly connected to the top of the other end of the front crossbeam (1), and the two guide portions (4) are symmetrically arranged with respect to each other.

4. The shearing guide device for plastic packaging bags according to claim 3, characterized in that: The other rack (51) is slidably connected to the sliding sleeve (42) in the other guide part (4), and the other end of the roller (53) is rotatably connected to the inner wall of the other rotating sleeve (52). The two racks (51) are respectively engaged with the gear (48) on the same side.

5. The shearing guide device for plastic packaging bags according to claim 4, characterized in that: The connecting rod 1 (61) and the connecting rod 2 (62) in each anti-folding portion (6) are respectively aligned with the sliding hole (43) on the same side.

6. The shearing guide device for plastic packaging bags according to claim 1, characterized in that: The movable slider (2) is provided with a mounting portion (7), the mounting portion (7) includes a rear cross beam (71), a rod hole is provided in the middle of the top of the rear cross beam (71), the movable end of the electric push rod (37) is movably arranged on the inner wall of the rod hole, three reinforcing plates (72) are fixedly connected to the back of the rear cross beam (71), brackets (73) are fixedly connected to the three reinforcing plates (72), a support block is installed on the bracket (73), and the electric push rod (37) is installed on the support block.

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