A woodworking processing center

Abstract

The present invention provides a woodworking processing center, which belongs to the field of mechanical equipment technology. It solves the problem of poor stability of the existing woodworking processing center in synchronously pressing and positioning multiple workpieces. The woodworking processing center includes a frame and a processing platform horizontally arranged on the frame. A lifting frame that can be raised and lowered is connected to the frame, and the lifting frame is in the shape of a long strip and is arranged above the processing platform. A plurality of pressure rollers are connected to the lifting frame, and the plurality of pressure rollers are arranged in sequence along the length direction of the lifting frame. The lower part of the pressure roller is lower than the lower part of the lifting frame. The plurality of pressure rollers can be independently raised and lowered relative to the lifting frame, and elastic parts that can make the pressure rollers have a downward movement tendency are provided between the plurality of pressure rollers and the lifting frame. The stability of the woodworking processing center in synchronously pressing and positioning multiple workpieces is good.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical equipment and relates to a woodworking processing center. Background Art

[0002] Woodworking machining centers integrate a variety of wood processing methods, a typical example being engraving. Principle-wise, it's a combination of drilling and milling, and its applications range widely, including woodworking engraving machines, laser engraving machines, advertising engraving machines, jade engraving machines, stone engraving machines, and cylindrical engraving machines. Engraving machines have a wide range of applications, even replacing manual engraving techniques and laying the foundation for rapid, high-volume production of products. Woodworking machining centers are equipped with machining platforms and machining components. To improve machining efficiency, multiple workpieces are placed on the machining platform for simultaneous machining. The machining components exert force on the workpieces during machining, so positioning mechanisms are required to position the workpieces.

[0003] The workpiece is placed on the processing platform and needs to be pressed and positioned from top to bottom. There is a positioning structure of a woodworking processing center disclosed in the existing patent document (application number: 202010223861.1). A processing platform is provided on the frame in a horizontal sliding direction. The positioning structure includes several mounting seats arranged on the frame. Positioning rollers are horizontally provided on the mounting seats. The mounting seats are arranged in two rows. A lifting seat is connected to the mounting seats in a vertical sliding direction. One end of the positioning roller is connected to the lifting seat, and the other end of the two rows of positioning rollers faces the inside of the frame. When the lifting seat rises, the other end of the two rows of positioning rollers can be located above the processing platform. Each mounting seat is provided with a driving member. The structure drives the positioning roller to descend and press on the upper surface of the workpiece through the driving member. The positioning structure arranges two pressing rollers in the horizontal direction for two workpieces, and each pressing roller needs to be provided with a driving member for lifting and lowering. When the number of workpieces is large, a corresponding number of driving members is required, the cost is high, and the synchronization of multiple pressing rollers is also poor.

[0004] In response to the above problems, the patent document (application number: 202010224677.9) discloses a woodworking machine, in which a long pressure roller is arranged in the horizontal direction. The two ends of the pressure roller are driven by driving parts, so that one pressure roller can press multiple workpieces at the same time. However, although the multiple workpieces have the same shape and are pressed at the same part, there is still a certain height difference between the workpieces. Although the height difference is small, for the pressing of the pressure roller, even a slight height difference will cause a large difference in the pressing force between the two workpieces, which may easily cause the pressing force of the smaller workpiece to be too small and the positioning to be unstable, or the pressing force of the larger workpiece to be too large and damaged. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a woodworking processing center to solve the problem of poor stability of the existing woodworking processing center in synchronously pressing and positioning multiple workpieces.

[0006] The objectives of the present invention can be achieved through the following technical solutions: A woodworking processing center includes a frame and a processing platform horizontally arranged on the frame, a lifting frame that can be raised and lowered is connected to the frame, and the lifting frame is long and arranged above the processing platform, and is characterized in that a plurality of pressure rollers are connected to the lifting frame, and the plurality of pressure rollers are arranged in sequence along the length direction of the lifting frame, the lower part of the pressure rollers is lower than the lower part of the lifting frame, and the plurality of pressure rollers can be independently lifted and lowered relative to the lifting frame, and elastic parts are provided between the plurality of pressure rollers and the lifting frame to enable the pressure rollers to have a downward movement trend.

[0007] Multiple workpieces are placed on the processing platform at the same time. The processing platform can move with the workpieces to cooperate with the tool's continuous processing of the workpieces and the selection of different processing positions of the workpieces. The tool will generate a large and variable direction force on the workpiece during the processing of the workpiece. For this reason, the lifting frame of the present application is connected to a plurality of pressure rollers arranged along the length direction of the tool frame. The plurality of pressure rollers are aimed at the multiple workpieces on the processing platform, that is, the plurality of pressure rollers are driven to rise and fall by a lifting frame, which reduces the driving components and can ensure the synchronization of the lifting and falling of the plurality of pressure rollers. The lifting frame descends so that the plurality of pressure rollers are synchronously pressed on the multiple workpieces. At the same time, the plurality of pressure rollers can be independently raised and lowered relative to the lifting frame without interfering with each other. The lifting frame transmits the force to the elastic member, which acts on the pressure roller. When there is a height difference between the positions where the multiple workpieces are pressed, the lifting frame descends to the workpiece with the smallest height and is subjected to sufficient pressing force. At this time, the workpiece with the higher height can compress the elastic member to obtain a buffer, thereby preventing the workpiece with the higher height from being damaged by excessive pressing force. In this way, even if there is a certain height difference between the multiple workpieces, they can be synchronously pressed and positioned by their respective pressure rollers, and the stability of each workpiece is guaranteed.

[0008] In the aforementioned woodworking processing center, the lifting frame is arranged horizontally, and the multiple pressure rollers on the same lifting frame are all located on the same side of the lifting frame and arranged parallel to the lifting frame, with the axis lines of the multiple pressure rollers lying in the same vertical plane. Multiple workpieces are aligned and positioned by the support, and the center lines of the multiple pressure rollers lie in the same vertical plane. As a result, the pressing positions on the workpieces are roughly the same, reducing height differences at the pressing positions and ensuring uniform pressing force on the multiple workpieces, thereby ensuring positioning stability.

[0009] In the aforementioned woodworking processing center, the lifting frame is fixed with several sets of guide rails, arranged along the length of the lifting frame and arranged vertically. Guide blocks are slidably connected to each of the guide rails. The pressure rollers correspond to the guide rails, with the ends of the pressure rollers connected to two guide blocks of the same set of guide rails. The ends of the pressure rollers are guided by sliders that cooperate with the slide rails, ensuring the stability of the pressure rollers themselves. This creates a vertical downward pressure on the workpiece, preventing oblique thrust and ensuring stable workpiece positioning. Furthermore, during machining, when the machining platform moves with the workpiece, the pressure rollers can maintain stable downward pressure, preventing movement with the workpiece.

[0010] In the aforementioned woodworking machining center, connecting frames are fixed to the guide blocks, and the ends of the pressure roller are rotatably connected to the two connecting frames. The elastic member is disposed between the lifting frame and the connecting frames. The elastic members are disposed at both ends of the pressure roller, so that the entire pressure roller exerts a uniform pressure on the workpiece, ensuring the stability of the workpiece.

[0011] In the above-mentioned woodworking processing center, the lifting frame is threaded with a plurality of adjustment bolts corresponding to the connecting frame, and the adjustment bolts are vertically arranged above the connecting frame. The elastic member includes a coil spring, and the upper end of the coil spring abuts the lower end of the adjustment bolt, and the lower end abuts the upper end of the connecting frame. The initial position of the pressure roller can be adjusted by the adjustment bolt, that is, when the lifting frame is not lowered, the adjustment bolts are adjusted to make the plurality of pressure rollers at the same height, ensuring uniform pressing force on multiple workpieces. Of course, if the shapes of the workpieces on the processing platform are different, resulting in a large height difference in the pressing position, the pressure roller can also be adjusted by the adjustment bolts to make the pressure roller have a height difference to adapt to the height of different workpieces. At the same time, the adjustment bolts can also be used to adjust the pressing force of the pressure roller on the workpiece to improve positioning stability.

[0012] In the aforementioned woodworking machining center, the pressure roller includes a rotating shaft, each end of which is rotatably connected to two connecting frames via bearings. A buffer sleeve is provided on the rotating shaft. The buffer sleeve provides a buffer to prevent damage to tall workpieces caused by the high pressure. The rotating shaft is rotatably connected to the connecting frames, so that when the machining platform moves with the workpiece, the pressure roller can roll directly along the upper surface of the workpiece, avoiding wear on the workpiece and reducing horizontal friction thrust on the workpiece, thereby ensuring workpiece stability.

[0013] In the aforementioned woodworking machining center, the elastic member comprises two elastic spring steel wires, one end of each of which is fixed to the lifting frame, and the other end of which is bent to the side of the lifting frame and further downward. The two ends of the pressure roller are respectively connected to the other ends of the two spring steel wires. The spring steel wires provide support for the pressure rollers and also possess a certain degree of elasticity. In this case, if the position of the upper surface of the workpiece relative to the pressure rollers is an inclined surface, the pressure rollers are movable and can move along the inclined surface to find a suitable and easily abutting position, thereby preventing the workpiece from being subjected to large horizontal thrust due to the inclined surface. The abutment and pressing are also more stable, thereby ensuring the stability of the workpiece.

[0014] In the aforementioned woodworking machining center, the elastic member comprises an elastic cylinder, which is fixed to a lifting frame with its piston rod facing vertically downward. The pressure roller is connected to the piston rod of the elastic cylinder. The elastic cylinder is a gas spring that can adjust the pressure on the pressure roller in real time by adjusting the internal air pressure, thereby achieving tight positioning of the workpiece.

[0015] In the aforementioned woodworking processing center, the processing platform is arranged to slide longitudinally, while the lifting frames are arranged transversely. Multiple lifting frames are provided and arranged longitudinally. The frame is equipped with a plurality of drive members capable of independently driving the lifting frames to move upward and downward. A single workpiece can be held in place by multiple longitudinally arranged pressure rollers. As the processing platform moves longitudinally, different pressure rollers apply pressure, ensuring that the workpiece is always held in place and securely pressed. The drive members enable the lifting frames to be raised and lowered individually, adjusting the height of the workpiece's top surface to ensure stable workpiece positioning.

[0016] In the aforementioned woodworking processing center, sliders are fixedly connected to both ends of the lifting frame. The frame is connected to a plurality of mounting blocks on both sides of the processing platform. These mounting blocks are arranged longitudinally and vertically fixed to the mounting blocks with slide rails. The sliders at both ends of the lifting frame are slidably connected to the slide rails on both sides. The cooperation between the sliders and the slide rails ensures the stability and levelness of the lifting frame, thereby applying a uniform pressing force to the workpiece.

[0017] In the woodworking processing center, the driving member includes a driving cylinder fixed to the mounting base, the piston rod of the driving cylinder facing upward and fixedly connected to the slider. The lifting frame is driven up and down by the driving cylinder, and the travel accuracy is high.

[0018] Compared with the existing technology, this woodworking processing center has the following advantages:

[0019] 1. Since multiple pressing rollers can be raised and lowered independently relative to the lifting frame without interfering with each other, when there is a height difference between the positions where multiple workpieces are pressed, the lifting frame descends to the workpiece with the smallest height and receives sufficient pressing force. At this time, the workpiece with higher height can compress the elastic part to obtain a buffer, thus preventing the workpiece with higher height from being damaged by excessive pressing force. As a result, even if there is a certain height difference between multiple workpieces, they can be synchronously pressed and positioned by their respective pressing rollers, and the stability of each workpiece is guaranteed.

[0020] 2. Since multiple pressure rollers are driven to rise and fall by a lifting frame, the number of driving components is reduced and the synchronization of the lifting of multiple pressure rollers can be ensured.

[0021] 3. Since the coil spring is arranged between the adjusting bolt and the connecting frame, the initial position of the pressure roller can be adjusted by adjusting the bolt so that several pressure rollers are at the same height, ensuring uniform pressing force on multiple workpieces. At the same time, the pressing force of the pressure roller on the workpiece can also be adjusted by adjusting the bolt to improve positioning stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural diagram of a woodworking processing center.

[0023] Figure 2 It is the structural front view of the woodworking processing center.

[0024] Figure 3 yes Figure 2 Structural cross-section view at AA in the middle.

[0025] Figure 4 It is a structural cross-sectional view of the pressure roller.

[0026] Figure 5 yes Figure 1 A magnified view of the structure at point B.

[0027] Figure 6 yes Figure 2 Enlarged view of the structure at point C in the middle.

[0028] Figure 7 yes Figure 3 Enlarged view of the structure at point D in the middle.

[0029] Figure 8 yes Figure 1 Enlarged view of the structure at E in the middle.

[0030] Figure 9 It is a schematic diagram of the three-dimensional structure of the woodworking processing center in the second embodiment.

[0031] Figure 10 yes Figure 9 Enlarged view of the structure at F in the middle.

[0032] In the figure, 1. frame; 11. column; 12. crossbeam; 13. cross slide; 14. vertical slide; 15. support; 16. connecting rail; 2. processing platform; 3. tool holder; 31. processing assembly; 4. lifting frame; 41. guide rail; 42. slider; 43. limit plate; 44. adjusting bolt; 441. abutment; 5. pressure roller; 51. rotating shaft; 52. buffer sleeve; 53. connecting sleeve; 6. connecting frame; 61. bottom plate; 62. side plate; 63. top plate; 64. slider; 65. bearing; 7. coil spring; 8. mounting seat; 81. connecting block; 82. slide rail; 83. driving cylinder; 9. spring wire; 91. fixed section; 92. elastic section; 93. connecting section; 10. fixing ring; 101. bolt. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0034] Example 1:

[0035] like Figure 1 、 Figure 2 、 Figure 3 As shown, a woodworking processing center includes a machine frame 1, a tool holder 3 and a processing platform 2. The machine frame 1 has two vertically arranged columns 11. A horizontally arranged crossbeam 12 is fixed between the tops of the two columns 11. Two cross-slide plates 13 are connected to the crossbeam 12 in a horizontal sliding manner. Vertical slide plates 14 are connected to the two cross-slide plates 13 in a vertical sliding manner. Supports 15 are fixed to the sides of the two vertical slide plates 14. The tool holder 3 is long and strip-shaped, and the two ends of the tool holder 3 are respectively rotatably connected to the two supports 15, so that the tool holder 3 is arranged in a horizontal direction. Several processing components 31, the processing components 31 include a processing motor fixed on the tool holder 3 and a tool installed at the output end of the processing motor. Several processing components 31 are evenly distributed in the horizontal direction, and the processing platform 2 is connected to the frame 1 in a longitudinal sliding manner, and the processing platform 2 is located between the two columns 11, and the tool holder 3 is located above the processing platform 2, that is, the processing platform 2 can move longitudinally below the tool holder 3, and the horizontal slide 13, the vertical slide 14 and the processing platform 2 are all driven by their respective drive motors and screw nut assemblies, and the tool holder 3 is driven to rotate by the rotary motor and the reducer.

[0036] The frame 1 is connected to a plurality of lifting frames 4 that can be lifted and lowered. The lifting frames 4 are all in the shape of long bars and are arranged horizontally in the transverse direction. The lifting frames 4 are arranged in sequence in the longitudinal direction. The lifting frames 4 are all located above the processing platform 2, that is, the processing platform 2 can move longitudinally below the lifting frames 4. Each lifting frame 4 is connected to a plurality of pressure rollers 5 through a connecting frame 6. The pressure rollers 5 of each lifting frame 4 are all located on the same side of the lifting frame 4 and are arranged in sequence in the transverse direction. The pressure rollers 5 are arranged parallel to the lifting frame 4. Specifically, combined with Figure 4 As shown, the pressure roller 5 includes a rotating shaft 51 and a buffer sleeve 52 sleeved on the rotating shaft 51. The buffer sleeve 52 can be made of rubber material. Figure 5 、 Figure 6 As shown in FIG7 , several groups of guide rails 41 are fixed on the side of the lifting frame 4. The several groups of guide rails 41 are arranged along the length direction of the lifting frame 4, and the guide rails 41 are all vertically arranged. The connecting frame 6 includes a bottom plate 61, a side plate 62 and a top plate 63. The bottom plate 61 and the side plate 62 are all vertically arranged. A guide block 64 is fixed on one side of the bottom plate 61. The guide block 64 is slidably connected to the guide rail 41. The side plate 62 is vertically fixed on the other side of the bottom plate 61. The top plate 63 is horizontally fixed to the top of the bottom plate 61 and the side plate 62. Connecting holes are opened on the side plates 62. The two ends of the rotating shaft 51 are rotatably connected to the connecting holes of the two side plates 62 of the same pair of slide rails 82 through bearings 65, so that the lower part of the pressing roller 5 is lower than the lower part of the bottom plate 61 and the side plate 62. At the same time, the lower part of the pressing roller 5 is also lower than the lower part of the lifting frame 4. The center lines of the several pressing rollers 5 on the same lifting frame 4 are located in the same vertical plane. A number of limit plates 43 are fixed on the top surface of the lifting frame 4. The limit plates 43 are arranged in sequence along the length direction of the lifting frame 4, and the limit plates 43 are arranged in one-to-one correspondence with the connecting frames 6. One end of the limit plate 43 extends out of the side of the connecting frame 6 and is located above the connecting frame 6. A coil spring 7 is connected to the top plate 63 of the connecting frame 6. An adjusting bolt 44 is screwed on the limit plate 43. The adjusting bolt 44 is vertically arranged. A disc-shaped abutment 441 is provided at the lower end of the adjusting bolt 44. The abutment 441 is opposite to the top plate 63 of the connecting frame 6. The upper end of the coil spring 7 abuts against the lower end surface of the abutment 441. Under the action of the coil spring 7, the pressure roller 5 tends to move downward.

[0037] Combine Figure 8As shown, the frame 1 has a row of mounting blocks 8 fixed to both lateral sides of the processing platform 2. The mounting blocks 8 in the same row are arranged longitudinally in sequence, and the mounting blocks 8 in the two rows are arranged one-to-one. Specifically, connecting rails 16 are fixed to both lateral sides of the processing platform 2 in the longitudinal direction. Connecting blocks 81 are fixed to the bottom of the mounting blocks 8. The connecting blocks 81 on the mounting blocks 8 in the same row are all slidably connected to the connecting rails 16 and fixed by screws. The mounting blocks 8 are all columnar and vertically arranged. The upper ends of the mounting blocks 8 are all higher than the processing platform 2. Guide rails 41 are vertically fixed to the sides of the mounting blocks 8. Guide blocks 64 are fixed to both ends of the lifting frame 4. The guide blocks 64 at both ends of the lifting frame 4 are respectively slidably connected to the guide rails 41 of the corresponding two mounting blocks 8. Vertically arranged driving cylinders 83 are fixed to the sides of the mounting blocks 8. The piston rod of the driving cylinder 83 faces upward and is fixed to the slider 42.

[0038] Example 2:

[0039] The structure of the woodworking processing center is basically the same as that of the first embodiment. The difference is that Figure 9 、 Figure 10 As shown, the pressure roller 5 is connected to the lifting frame 4 through an elastic member, and both ends of the rotating shaft 51 of the pressure roller 5 are sleeved with a connecting sleeve 53, and the bearing 65 is arranged between the connecting sleeve 53 and the rotating shaft 51. The connecting member includes a spring steel wire 9 and a fixing ring 10. The fixing ring 10 is sleeved on the lifting frame 4 and is locked and fixed to the lifting frame 4 by a number of bolts 101 penetrated in the radial direction. The spring steel wire 9 includes a fixed section 91, an elastic section 92 and a connecting section 93. The fixed section 91 and the connecting section 93 are both spiral. The elastic section 92 is located between the fixed section 91 and the connecting section 93. The fixed section 91 is spirally sleeved on the lifting frame 4 and fixed to the fixing ring 10. The connecting section 93 is spirally sleeved. The elastic section 92 is fixed on the connecting sleeve 53, and one end of the elastic section 92 smoothly transitions to the fixed section 91 along the spiral direction of the fixed section 91, and the other end of the elastic section 92 smoothly transitions to the connecting section 93 along the spiral direction of the connecting section 93. The end of the elastic section 92 connected to the fixed section 91 is located above the lifting frame 4 and arches upward in an arc shape, so that there is a gap between the elastic section 92 and the upper part of the lifting frame 4. The end of the elastic section 92 connected to the connecting section 93 bends downward and extends to the side of the lifting frame 4, so that there is a gap between the elastic section 92 and the side of the lifting frame 4. At this time, there is a gap between the pressure roller 5 and the side of the lifting frame 4, and the lower part of the pressure roller 5 is lower than the lower part of the lifting frame 4.

[0040] Example 3:

[0041] The structure of this woodworking processing center is basically the same as that of Example 1, except that the elastic member includes two elastic cylinders, which are fixed on the lifting frame 4, and the piston rods of the elastic cylinders are vertically downward, and the piston rods of the two elastic cylinders are respectively connected to the connecting frames 6 at both ends of the pressure roller 5.

[0042] Example 4:

[0043] The structure of this woodworking processing center is basically the same as that of Example 1, except that the processing platform 2 is fixed on the frame 1, and the frame 1 and the column 11 are split. The lower ends of the two columns 11 are both slidably arranged on the frame 1 along the longitudinal direction. The columns 11 and the crossbeam 12 drive the tool holder 3 to move longitudinally for processing and position adjustment. A bracket is connected between the two columns 11, and the mounting seat 8 is fixed on the bracket, so that when the column 11 drives the tool holder 3, it simultaneously drives the pressure roller 5 to move longitudinally.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0045] Although the terms frame 1, column 11, and beam 12 are frequently used herein, the use of other terms is not excluded. These terms are used merely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A woodworking processing center, comprising a frame (1) and a processing platform (2) horizontally arranged on the frame (1), a lifting frame (4) capable of lifting and lowering is connected to the frame (1), and the lifting frame (4) is in a long strip shape and is arranged above the processing platform (2), characterized in that: The lifting frame (4) is connected to a plurality of pressure rollers (5), and the plurality of pressure rollers (5) are arranged in sequence along the length direction of the lifting frame (4). The lower portion of the pressure rollers (5) is lower than the lower portion of the lifting frame (4). The plurality of pressure rollers (5) can be independently lifted relative to the lifting frame (4), and elastic members are provided between the plurality of pressure rollers (5) and the lifting frame (4) to enable the pressure rollers (5) to have a downward movement tendency; both ends of the rotating shaft (51) of the pressure roller (5) are sleeved with connecting sleeves (53), and the pressure roller (5) is connected to the lifting frame (4) through the elastic member. The elastic member includes a spring steel wire (9) and a fixing ring (10), the fixing ring (10) is sleeved on the lifting frame (4), the spring steel wire (9) includes a fixing section (91), an elastic section (92) and a connecting section (93), the fixing section (91) and the connecting section (93) are both spiral-shaped, the elastic section (92) is located between the fixing section (91) and the connecting section (93), the fixing section (91) is spirally sleeved on the lifting frame (4) and fixed to the fixing ring (10), and the connecting section (93) is spirally sleeved on the connecting sleeve (53) and fixed.

2. The woodworking processing center according to claim 1, characterized in that: The lifting frame (4) is arranged in the transverse direction, and the plurality of pressure rollers (5) on the same lifting frame (4) are all located on the same side of the lifting frame (4) and are arranged parallel to the lifting frame (4), and the axis lines of the plurality of pressure rollers (5) are located on the same vertical plane.

3. The woodworking processing center according to claim 1 or 2, characterized in that: The processing platform (2) is arranged to slide in the longitudinal direction, the lifting frame (4) is arranged in the transverse direction, and there are a plurality of lifting frames (4) arranged in sequence in the longitudinal direction. The frame (1) is provided with a plurality of driving members capable of independently driving the plurality of lifting frames (4) to move up and down.

4. The woodworking processing center according to claim 3, characterized in that: Both ends of the lifting frame (4) are fixedly connected with sliders (42), and the frame (1) is connected with a plurality of mounting seats (8) on both sides of the processing platform (2). The plurality of mounting seats (8) are arranged in sequence along the longitudinal direction, and slide rails (82) are fixed vertically on the mounting seats (8). The sliders (42) at both ends of the lifting frame (4) are respectively slidably connected to the slide rails (82) on both sides, and the driving member includes a driving cylinder (83) fixed on the mounting seat (8), and the piston rod of the driving cylinder (83) faces upward and is fixedly connected to the slider (42).

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