Polishing machine with workpiece rotary support device

Abstract

The present invention relates to the technical field of polishing machines, and specifically to a polishing machine with a workpiece rotary support device, comprising a support base, a wheel hub detachably mounted on the support base through a rotary support mechanism, two connecting columns symmetrically arranged on the wheel hub, a driving frame is arranged between the two connecting columns and the support base, and the lower ends of the two connecting columns are fixedly connected to connecting disks, and the lower ends of the two connecting disks are fixedly mounted with electric motors. The present invention can fix a spoke-intensive wheel hub and the rotation angle of the wheel hub can be controlled each time, and a rolled spring sheet with a sand surface on the outer surface can extend between two adjacent spokes in a retracted state when polishing the inner side of the spoke of the wheel hub, and the rolled spring sheet can be reset and opened and can adapt to the gradually increasing space between the adjacent spokes from the inside to the outside to polish the inner side of the two adjacent spokes, so that polishing is convenient, which provides convenience for the staff.

Description

Technical Field

[0001] The invention relates to the technical field of polishing machines, in particular to a polishing machine with a workpiece rotary support device. Background Art

[0002] A wheel polisher is a device used to polish and buff vehicle wheels. The wheel hub is the center of the wheel on a vehicle, usually made of metal materials such as aluminum alloy or steel. Over time, the wheel hub may become oxidized, dirty or scratched due to use, exposure to the external environment and other factors. The wheel hub polisher can fix and support the wheel hub and rotate it into a cylinder filled with polishing particles to remove the oxide layer, dirt and scratches through friction, thereby achieving a polishing effect. For wheels with sparse spokes, the wheel hub can be polished evenly.

[0003] For spoke-intensive wheels, since the spacing between adjacent spokes is relatively small, this will result in poor fluidity of the polishing particles in the space between adjacent spokes. There may still be some defects after polishing, and even material jamming may occur. Workers are often required to use polishing tools to additionally polish the inner side of the spokes. However, the space between adjacent spokes usually increases gradually from the inside to the outside, and the polishing work will be more complicated, causing inconvenience to the workers. Summary of the invention

[0004] The object of the present invention is to provide a polishing machine with a workpiece rotary support device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a polishing machine with a workpiece rotary support device, comprising a support base, a wheel hub is detachably installed on the top of the support base through a rotary support mechanism, two connecting columns are symmetrically arranged above the wheel hub, a driving frame is provided between the two connecting columns and the support base, and the lower ends of the two connecting columns are fixedly connected to connecting disks, the lower ends of the two connecting disks are fixedly installed with motors, the output shaft ends of the two motors are fixedly connected to connecting shafts, the outer walls of the two connecting shafts are fixedly connected to rolled spring sheets, the outer surfaces of the two rolled spring sheets are both sanded, and compression mechanisms are provided between the two rolled spring sheets and the two connecting disks respectively.

[0006] Preferably, the slewing support mechanism includes a stepper motor, which is fixedly mounted on the upper end of the support base, and a rotating disk is fixedly mounted on the output shaft end of the stepper motor, the upper end of the rotating disk is fitted with the lower end of the wheel hub, and the outer wall of the rotating disk is symmetrically fixedly connected with two support frames, and the upper ends of the two support frames are fixedly mounted with first electric push rods, and the telescopic shaft ends of the two first electric push rods are fixedly connected with V-shaped clamps, and the two V-shaped clamps are symmetrically fitted on the outer wall of the wheel hub near the lower edge.

[0007] Preferably, the driving frame includes an L-shaped support frame, which is fixedly installed at one side edge of the upper end of the support base, and two electric slides are symmetrically fixedly installed at one side edge of the lower end surface of the horizontal wall of the L-shaped support frame, and second electric push rods are fixedly installed on the working slides of the two electric slides, and the telescopic shaft ends of the two second electric push rods are respectively fixedly connected to the top ends of the two connecting columns.

[0008] Preferably, the compression mechanism includes a plurality of slide grooves, and the plurality of slide grooves are arranged around the central annular array of the connecting disk and are opened at the upper end of the connecting disk, and a splicing rod is slidably fitted inside the plurality of slide grooves, and a splicing block is fixedly connected to the lower end of the plurality of splicing rods, and the plurality of splicing blocks are located on the outside of the rolled spring sheet, and one end of the plurality of splicing blocks corresponding to the rolled spring sheet is fixedly connected to an arc plate, and the outer walls of the plurality of splicing rods are fixedly connected to guide columns near the upper edge, and the plurality of guide columns are respectively located on the inner sides of the plurality of slide grooves, and one end of the plurality of guide columns away from the splicing rod movably passes through the connecting disk, and an adjustment mechanism is provided between the plurality of splicing rods and the connecting columns.

[0009] Preferably, the adjustment mechanism includes a connecting ring, which is slidably mounted on the outer wall of the connecting column near the connecting disk, and a first spring is fixedly connected between the lower end of the connecting ring and the upper end of the connecting disk, and the first spring is slidably mounted on the outer wall of the connecting column, and the outer wall of the connecting ring is rotatably connected to a plurality of connecting rods in a circular array around its center, and the ends of the plurality of connecting rods away from the connecting ring are rotatably connected to a fixed disk, and the plurality of fixed disks are respectively fixedly connected to the upper ends of a plurality of splicing rods, and a linkage mechanism is provided between the connecting ring, the connecting disk and the L-shaped support frame.

[0010] Preferably, the linkage mechanism includes a Z-shaped block, two L-shaped blocks and a blocking block, the Z-shaped block is fixedly connected to the upper end of the connecting ring, the two L-shaped blocks are symmetrically fixedly connected to the upper end of the connecting plate, and the horizontal walls of the two L-shaped blocks are higher than the Z-shaped block, the blocking block is fitted at the edge of the lower end surface of the upper horizontal wall of the Z-shaped block, and one side wall of the blocking block is provided with two symmetrical inclined surfaces from top to bottom, and an elastic bracket is connected between the blocking block and the L-shaped support frame.

[0011] Preferably, the elastic bracket includes a fixed block, which is fixedly connected to the inner wall of the L-shaped support frame, and the lower end of the fixed block is fixedly connected to the connecting frame, and two sliding columns are symmetrically slidably inserted in the inner wall at the lower edge of the connecting frame, one end of the two sliding columns is fixedly connected to the other side wall of the blocking block, and a second spring is slidably sleeved on the outer walls of the two sliding columns, and the two second springs are fixedly connected between the blocking block and the connecting frame.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. By providing a support base and a slewing support mechanism, not only can the spoke-intensive hub be fixed, but also the rotation angle of the hub can be controlled each time.

[0014] Through the mutual cooperation of the connecting column, the driving frame, the connecting plate, the motor, the connecting shaft, the rolled spring piece, the compression mechanism, the adjusting mechanism, the linkage mechanism and the elastic bracket, the rolled spring piece with a sand surface on the outer surface can be extended into between two adjacent spokes in a retracted state when polishing the inner side of the spoke of the wheel hub, and the rolled spring piece can be reset and opened and can adapt to the gradually increasing space between the adjacent spokes from the inside to the outside to polish the inner side of the two adjacent spokes, so that polishing is convenient, which provides convenience for the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a display diagram of the rolled spring sheet and the compression mechanism of the present invention;

[0017] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in FIG.

[0018] Figure 4 It is a display diagram of the rolled spring sheet and the compression mechanism of the present invention from another viewing angle;

[0019] Figure 5 It is a front view of the present invention;

[0020] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in FIG.

[0021] Figure 7 It is a diagram showing the local structure of the present invention.

[0022] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1. L-shaped support frame; 2. electric slide; 3. rotating disk; 4. wheel hub; 5. V-shaped clamp; 6. support frame; 7. first electric push rod; 8. support base; 9. fixed block; 10. second electric push rod; 11. connecting disk; 12. guide column; 13. motor; 14. arc plate; 15. rolled spring; 16. splicing rod; 17. connecting frame; 18. L-shaped block; 19. connecting column; 20. Z-shaped block; 21. connecting ring; 22. first spring; 23. connecting rod; 24. slide groove; 25. fixed disk; 26. blocking block; 27. connecting shaft; 28. splicing block; 29. ​​stepping motor; 30. second spring; 31. sliding column. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] See also Figure 1-Figure 7 A polishing machine with a workpiece rotary support device shown in the figure includes a support base 8, a wheel hub 4 is detachably installed on the top of the support base 8 through a rotary support mechanism, two connecting columns 19 are symmetrically arranged on the top of the wheel hub 4, a driving frame is provided between the two connecting columns 19 and the support base 8, and the lower ends of the two connecting columns 19 are fixedly connected to connecting disks 11, the lower ends of the two connecting disks 11 are fixedly installed with motors 13, the output shaft ends of the two motors 13 are fixedly connected to connecting shafts 27, the outer walls of the two connecting shafts 27 are fixedly connected to rolled spring sheets 15, the outer surfaces of the two rolled spring sheets 15 are both sanded, and compression mechanisms are provided between the two rolled spring sheets 15 and the two connecting disks 11 respectively.

[0026] See also Figure 2-Figure 7In the figure, the compression mechanism includes a plurality of slide grooves 24, and the plurality of slide grooves 24 are arranged around the central annular array of the connecting disk 11 and penetrate through the upper end of the connecting disk 11, and the interiors of the plurality of slide grooves 24 are slidably fitted with splicing rods 16, and the lower ends of the plurality of splicing rods 16 are fixedly connected with splicing blocks 28, and the plurality of splicing blocks 28 are all located on the outside of the rolled spring sheet 15, and one end of the plurality of splicing blocks 28 corresponding to the rolled spring sheet 15 is fixedly connected with an arc plate 14, and the outer walls of the plurality of splicing rods 16 are fixedly connected with guide columns 12 near the upper edge, and the plurality of guide columns 12 are respectively located on the inner sides of the plurality of slide grooves 24, and the ends of the plurality of guide columns 12 away from the splicing rods 16 are movably penetrated through the connecting disk 11, and an adjustment mechanism is provided between the plurality of splicing rods 16 and the connecting column 19.

[0027] See also Figure 2-Figure 7 In the figure, the adjustment mechanism includes a connecting ring 21, which is slidably mounted on the outer wall of the connecting column 19 near the connecting disk 11, and a first spring 22 is fixedly connected between the lower end of the connecting ring 21 and the upper end of the connecting disk 11. The first spring 22 is slidably mounted on the outer wall of the connecting column 19, and the outer wall of the connecting ring 21 is rotatably connected to a plurality of connecting rods 23 in a circular array around its center. The ends of the plurality of connecting rods 23 away from the connecting ring 21 are rotatably connected to a fixed disk 25, and the plurality of fixed disks 25 are respectively fixedly connected to the upper ends of the plurality of splicing rods 16, and a linkage mechanism is provided between the connecting ring 21, the connecting disk 11 and the L-shaped support frame 1.

[0028] See also Figure 2-Figure 7 In the figure, the linkage mechanism includes a Z-shaped block 20, two L-shaped blocks 18 and a blocking block 26. The Z-shaped block 20 is fixedly connected to the upper end of the connecting ring 21, and the two L-shaped blocks 18 are symmetrically fixedly connected to the upper end of the connecting plate 11, and the horizontal walls of the two L-shaped blocks 18 are higher than the Z-shaped block 20. The blocking block 26 is attached to the edge of the lower end surface of the upper horizontal wall of the Z-shaped block 20, and one side wall of the blocking block 26 is provided with two symmetrical inclined surfaces from top to bottom, and an elastic bracket is connected between the blocking block 26 and the L-shaped support frame 1.

[0029] See also Figure 2 , Figure 3 , Figure 5 and Figure 6 In the figure, the elastic bracket includes a fixed block 9, which is fixedly connected to the inner wall of the L-shaped support frame 1, and the lower end of the fixed block 9 is fixedly connected to the connecting frame 17, and two sliding columns 31 are symmetrically slidably inserted in the inner wall at the lower edge of the connecting frame 17, one end of the two sliding columns 31 is fixedly connected to the other side wall of the blocking block 26, and the outer walls of the two sliding columns 31 are slidably sleeved with second springs 30, and the two second springs 30 are fixedly connected between the blocking block 26 and the connecting frame 17.

[0030] In this embodiment, first, the wheel hub 4 can be fixed on the top of the support base 8 by a swivel support mechanism, and the wheel hub 4 can adjust the angle of each rotation by the swivel support mechanism, and make the centers of the two gaps of the wheel hub 4 correspond to the axes of the two connecting shafts 27 respectively, and then the two connecting columns 19 can be driven downward by the driving frame, and the connecting column 19 can drive the connecting disk 11, two L-shaped blocks 18, multiple guide columns 12, multiple splicing rods 16, multiple splicing blocks 28 and multiple arc plates 14, motor 13, connecting shaft 27 and rolled spring sheet 15 to move downward together, because the Z-shaped block 20 is blocked by the blocking block 26, the connecting rod 23 rotatably connected between the outer wall of the connecting ring 21 and the fixed disk 25 at the top of the multiple splicing rods 16 can rotate accordingly, and the bottom ends of the multiple connecting rods 23 will move close to the direction of the connecting column 19, the first spring 22 connected between the connecting ring 21 and the connecting disk 11 will be stretched, and the multiple splicing rods 16 will move toward the connecting column 1 in the corresponding slide groove 24. 9, the multiple splicing rods 16 can respectively drive the multiple arc plates 14 to move in the direction of the rolled spring piece 15 through the splicing block 28, and the rolled spring piece 15 can be squeezed and rolled up by the multiple arc plates 14 while moving downward, until the rolled spring piece 15 with a larger radius can extend between two adjacent spokes of the wheel hub 4. In this process, the lower edges of the horizontal walls of the two L-shaped blocks 18 will slide in contact with the upper inclined surface of the side wall of the blocking block 26 and push the blocking block 26 to squeeze and connect The second spring 30 connected between the frame 17, the Z-shaped block 20 will lose the obstruction of the blocking block 26, and under the action of the first spring 22, the Z-shaped block 20 and the connecting ring 21 will automatically move downward, and the multiple connecting rods 23 will rotate accordingly and the bottom ends will move away from the connecting column 19, then the multiple splicing rods 16 will slide in the corresponding slide grooves 24 away from the connecting column 19, and the multiple arc plates 14 can loosen the rolled spring pieces 15, and the rolled spring pieces 15 can be reset and fit on the inner sides of the two adjacent spokes.

[0031] Then, the motor 13 is connected to an external power source, and the motor 13 can drive the connecting shaft 27 to rotate together with the rolled spring sheet 15. Since the outer surface of the rolled spring sheet 15 is a sand surface, the rolled spring sheet 15 can grind the inner sides of two adjacent spokes at the same time. The driving frame can also drive the connecting column 19 to move toward the center of the hub 4 or away from the center of the hub 4, and the rolled spring sheet 15 can fully grind the inner sides of two adjacent spokes. Since the space between adjacent spokes usually increases from the inside to the outside, the rolled spring sheet 15 will be stored or expanded accordingly, and polishing is convenient.

[0032] After polishing is completed, the connecting column 19 can be driven upward by the driving frame to move Figure 6It can be seen that the angle and range of the upper inclined surface of the side wall of the blocking block 26 are smaller than the lower inclined surface of the side wall of the blocking block 26. When the connecting column 19 moves up with the parts connected to it, the upper edges of the horizontal walls of the two L-shaped blocks 18 will slide in contact with the lower inclined surface of the side wall of the blocking block 26 and push the blocking block 26 to squeeze the second spring 30 connected to the connecting frame 17. The two L-shaped blocks 18 will pass over the blocking block 26, and the Z-shaped block 20 will also pass over the blocking block 26. Because the elastic force of the first spring 22 is greater than the elastic force of the second spring 30, it will not be affected by the elastic connection of the Z-shaped block 20. The rotation angle of the wheel hub 4 and the downward movement, rotation, and forward and backward movement of the rolled spring sheet 15 are continuously controlled, so that the inner side of the spoke of the wheel hub 4 can be conveniently polished.

[0033] Example 2

[0034] See also Figure 1 and Figure 5 The present embodiment further explains Example 1. In the figure, the slewing support mechanism includes a stepper motor 29, which is fixedly mounted on the upper end of the support base 8, and a rotating disk 3 is fixedly mounted on the output shaft end of the stepper motor 29. The upper end of the rotating disk 3 fits with the lower end of the wheel hub 4, and the outer wall of the rotating disk 3 is symmetrically fixedly connected with two supporting frames 6, and the upper ends of the two supporting frames 6 are fixedly mounted with first electric push rods 7, and the telescopic shaft ends of the two first electric push rods 7 are fixedly connected with V-shaped clamping plates 5, and the two V-shaped clamping plates 5 are symmetrically fitted on the outer wall of the wheel hub 4 near the lower edge.

[0035] In this embodiment, when fixing the wheel hub 4, the wheel hub 4 is first placed on the upper end of the rotating disk 3, and then the two first electric push rods 7 are connected to an external power source, so that the two first electric push rods 7 can respectively drive the two V-shaped clamping plates 5 to clamp the wheel hub 4. At this time, the axis of the wheel hub 4 corresponds to the axis of the connecting column 19 and the axis of the connecting shaft 27. When it is necessary to rotate the angle of the wheel hub 4 while fixing the wheel hub 4, the stepper motor 29 is connected to an external power source, so that the stepper motor 29 can drive the rotating disk 3 to rotate, and the stepper motor 29 can set the rotation angle of the motor shaft. This is a well-known prior art and will not be elaborated on. The rotation angle of the rotating disk 3 can be set, and the rotation angle of the wheel hub 4 can be set.

[0036] Example 3

[0037] See also Figure 1 , Figure 2 and Figure 5The present embodiment further explains Example 1. The driving frame in the figure includes an L-shaped support frame 1, which is fixedly installed at the edge of one side of the upper end of the support base 8, and two electric slides 2 are symmetrically fixedly installed at the edge of one side of the lower end surface of the horizontal wall of the L-shaped support frame 1. Second electric push rods 10 are fixedly installed on the working slides of the two electric slides 2, and the telescopic shaft ends of the two second electric push rods 10 are respectively fixedly connected to the top ends of the two connecting columns 19.

[0038] In this embodiment, the electric slide 2 is connected to an external power supply, so that the working slide on the electric slide 2 can drive the second electric push rod 10 to move forward or backward, and the second electric push rod 10 can drive the connecting column 19 to move forward or backward. The second electric push rod 10 is connected to an external power supply, so that the second electric push rod 10 can drive the connecting column 19 to move downward, and can also drive the connecting column 19 to move upward after the connecting column 19 moves downward.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polishing machine with a workpiece rotary support device, comprising a support base (8), characterized in that: A wheel hub (4) is detachably mounted on the upper side of the support base (8) via a slewing support mechanism, two connecting columns (19) are symmetrically arranged on the upper side of the wheel hub (4), a driving frame is arranged between the two connecting columns (19) and the support base (8), and the lower ends of the two connecting columns (19) are fixedly connected to connecting disks (11), the lower ends of the two connecting disks (11) are fixedly mounted with motors (13), the output shaft ends of the two motors (13) are fixedly connected to connecting shafts (27), the outer walls of the two connecting shafts (27) are fixedly connected to rolled spring sheets (15), the outer surfaces of the two rolled spring sheets (15) are both sanded, and compression mechanisms are arranged between the two rolled spring sheets (15) and the two connecting disks (11); The driving frame comprises an L-shaped support frame (1), the L-shaped support frame (1) is fixedly mounted on an edge of one side of the upper end of the support base (8), and two electric slides (2) are symmetrically fixedly mounted on an edge of one side of the lower end surface of the horizontal wall of the L-shaped support frame (1), and a second electric push rod (10) is fixedly mounted on the working slides of the two electric slides (2), and the telescopic shaft ends of the two second electric push rods (10) are respectively fixedly connected to the top ends of the two connecting columns (19); The compression mechanism comprises a plurality of slide grooves (24), the plurality of slide grooves (24) are arranged in a central annular array around the connecting disk (11) and are opened at the upper end of the connecting disk (11), and the interiors of the plurality of slide grooves (24) are slidably fitted with splicing rods (16), the lower ends of the plurality of splicing rods (16) are fixedly connected with splicing blocks (28), the plurality of splicing blocks (28) are located on the outside of the rolled spring sheet (15), and one end of the plurality of splicing blocks (28) corresponding to the rolled spring sheet (15) is fixedly connected with an arc plate (14), the outer walls of the plurality of splicing rods (16) are fixedly connected with guide columns (12) near the upper edge, the plurality of guide columns (12) are respectively located on the inner sides of the plurality of slide grooves (24), and the ends of the plurality of guide columns (12) away from the splicing rods (16) are movably passed through the connecting disk (11), and an adjustment mechanism is provided between the plurality of splicing rods (16) and the connecting column (19); The adjustment mechanism comprises a connecting ring (21), the connecting ring (21) being slidably sleeved on the outer wall of the connecting column (19) near the connecting disk (11), and a first spring (22) being fixedly connected between the lower end of the connecting ring (21) and the upper end of the connecting disk (11), the first spring (22) being slidably sleeved on the outer wall of the connecting column (19), the outer wall of the connecting ring (21) being rotatably connected to a plurality of connecting rods (23) in a circular array around its center, the ends of the plurality of connecting rods (23) being rotatably connected to a fixed disk (25) away from the connecting ring (21), the plurality of fixed disks (25) being respectively fixedly connected to the upper ends of the plurality of splicing rods (16), and a linkage mechanism being provided between the connecting ring (21), the connecting disk (11) and the L-shaped support frame (1).

2. A polishing machine with a workpiece rotary support device according to claim 1, characterized in that: The slewing support mechanism comprises a stepper motor (29), the stepper motor (29) being fixedly mounted on the upper end of the support base (8), and a rotating disk (3) being fixedly mounted on the output shaft end of the stepper motor (29), the upper end of the rotating disk (3) being in contact with the lower end of the wheel hub (4), and the outer wall of the rotating disk (3) being symmetrically fixedly connected to two supporting frames (6), the upper ends of the two supporting frames (6) being fixedly mounted with first electric push rods (7), the telescopic shaft ends of the two first electric push rods (7) being fixedly connected with V-shaped clamping plates (5), and the two V-shaped clamping plates (5) being symmetrically in contact with the outer wall of the wheel hub (4) near the lower edge.

3. The polishing machine with a workpiece rotary support device according to claim 1, characterized in that: The linkage mechanism comprises a Z-shaped block (20), two L-shaped blocks (18) and a blocking block (26); the Z-shaped block (20) is fixedly connected to the upper end of the connecting ring (21); the two L-shaped blocks (18) are symmetrically fixedly connected to the upper end of the connecting plate (11); the horizontal walls of the two L-shaped blocks (18) are higher than the Z-shaped block (20); the blocking block (26) is fitted to the edge of the lower end surface of the upper horizontal wall of the Z-shaped block (20); one side wall of the blocking block (26) is provided with two symmetrical inclined surfaces from top to bottom; and an elastic bracket is connected between the blocking block (26) and the L-shaped support frame (1).

4. A polishing machine with a workpiece rotary support device according to claim 3, characterized in that: The elastic bracket comprises a fixed block (9), the fixed block (9) being fixedly connected to the inner wall of the L-shaped support frame (1), and the lower end of the fixed block (9) being fixedly connected to the connecting frame (17), two sliding columns (31) being symmetrically slidably inserted in the inner wall at the lower edge of the connecting frame (17), one end of the two sliding columns (31) being fixedly connected to the other side wall of the blocking block (26), and second springs (30) being slidably sleeved on the outer walls of the two sliding columns (31), and the two second springs (30) being fixedly connected between the blocking block (26) and the connecting frame (17).

Images