Folding jig glue spraying device

Abstract

The utility model discloses a folding jig glue spraying device, and relates to the technical field of glue spraying devices, the folding jig glue spraying device comprises an operation table, symmetrical sliding grooves are formed in the two sides of the top end of the operation table, sliding blocks are arranged in the sliding grooves, a moving frame is arranged between the tops of the two sliding blocks, and a moving assembly is arranged at the inner top of the moving frame; a frame is arranged at one end of the operation table, an adjusting assembly is arranged in the frame, and a glue spraying assembly is arranged at the bottom end of the moving assembly. The glue spraying device is reasonable and reliable in structure and easy to operate, can achieve automatic transverse adjustment of the glue spraying gun under the action of the moving assembly, can achieve longitudinal adjustment of the glue spraying gun under the action of the adjusting assembly, is suitable for the glue spraying efficiency of folding jigs with different lengths, and meanwhile improves the glue spraying efficiency under the action of the glue spraying assembly. And the glue spraying gun can perform multi-angle glue spraying work on the folding jig, so that the glue spraying efficiency of the glue spraying device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of glue spraying devices, in particular to a glue spraying device for a folding fixture. Background Art

[0002] As an emerging automation device in modern industry, glue spraying machine has become an indispensable part of many manufacturing processes. This device can spray glue evenly and accurately on the surface of products of different sizes and shapes, thereby achieving efficient bonding work. Glue spraying machine has a wide range of applications, including but not limited to electronic products, automotive parts, textiles and furniture manufacturing. Glue spraying machine shows its unique advantages in the process of folding jig glue spraying. Folding jig is a tool used to fix or support products. When spraying glue, it can ensure that the product is kept in the ideal position and angle, so as to achieve more accurate and uniform glue coverage. This not only improves the quality of glue spraying, but also greatly improves production efficiency and product consistency. However, the existing folding jig glue spraying device is not convenient for multi-angle glue spraying according to the shapes and sizes of different folding jigs, so it is not convenient to spray glue evenly on the folding jig, thereby reducing the glue spraying efficiency of the glue spraying device and affecting the subsequent use of the folding jig.

[0003] For example, Chinese patent CN216420024U discloses a folding jig glue spraying device, including a frame, a moving mechanism is arranged on the top of the frame, a glue gun is installed on the moving mechanism, and a jig is arranged at the bottom of the inner wall of the frame. By setting bolts, springs and a No. 1 motor, when a different jig is needed, the bolts are turned to make the jig vertical and then fixed, the No. 1 motor is started, the spacing between the original jigs is adjusted, and the new jig is clamped by the spring and the original jig, so that different jigs can be replaced, reducing the cumbersome disassembly process.

[0004] The glue spraying device for the folding jig has the following disadvantages: although the electric push rod drives the slider to move forward and backward, so that the glue gun can move in multiple directions, it only moves in the horizontal and vertical directions, which makes it inconvenient to spray glue at multiple angles according to the shapes and sizes of different folding jigs, and thus it is not convenient to spray glue evenly on the folding jig, thereby reducing the glue spraying efficiency of the glue spraying device and affecting the subsequent use of the folding jig. Utility Model Content

[0005] In view of the problems in the related technology, the utility model proposes a folding fixture glue spraying device to overcome the above technical problems existing in the existing related technology.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A folding jig glue spraying device comprises an operating table, wherein symmetrical sliding grooves are provided on both sides of the top of the operating table, sliders are provided inside the sliding grooves, a moving frame is provided between the tops of the two sliders, a moving assembly is provided on the inner top of the moving frame, a frame is provided at one end of the operating table, an adjustment assembly is provided inside the frame, a glue spraying assembly is provided at the bottom end of the moving assembly, fixed plates are symmetrically provided at both ends of the top of the operating table, a hydraulic rod is penetrated through the side wall of one end of the fixed plate, the ends of the hydraulic rod are connected to the fixed frame, a plurality of springs are provided on the inner walls of both sides of the fixed frame, a clamping plate is provided on one side of the spring, a folding jig body is provided between the two groups of clamping plates, and a control panel is provided on one side of the operating table.

[0008] Furthermore, in order to realize the lateral automatic adjustment of the glue gun under the action of the moving component, thereby saving manpower and improving work efficiency, while also ensuring the stability of the glue gun during the adjustment process, thereby improving the glue spraying effect of the glue spraying device, the moving component includes limit slide bars symmetrically arranged on the two side walls of the top of the moving frame, a threaded rod 1 is arranged between the two limit slide bars, a servo motor 1 connected to the threaded rod 1 is penetrated on one side of the moving frame, and a moving block matching with the limit slide bar and the threaded rod 1 is sleeved on the outer circumference.

[0009] Furthermore, in order to achieve longitudinal adjustment of the glue gun under the action of the adjusting component, so as to adapt the glue spraying efficiency of folding jigs of different lengths and thereby improve work efficiency, the adjusting component includes two threaded rods 2 penetrating the side wall of one end of the slider, one end of the two threaded rods 2 penetrating the side wall of one end of the frame is provided with a bevel gear 1, one side of the bevel gear 1 is meshed with a bevel gear 2, a rotating shaft is provided between the two bevel gears 2, one side of the rotating shaft penetrating the one side of the frame is provided with a servo motor 2, and the thread directions of the two threaded rods 2 are opposite.

[0010] Furthermore, in order to adjust the angle of the glue gun by extending and retracting the electric telescopic rod one under the action of the glue spraying assembly, the gear one is driven to move, the driving gear one is rotated, and the rotating rod one is driven to rotate, thereby driving the bracket to rotate forward and backward, thereby adjusting the angle of the glue spraying gun, and then the rack two is driven to drive the gear two to rotate by the electric telescopic rod two, so that the rotating rod two is rotated, and then the bracket is driven to rotate left and right, thereby adjusting the angle of the glue spraying gun, so that the glue spraying gun can spray glue on the folding jig at multiple angles, thereby improving the glue spraying efficiency of the glue spraying device. The glue spraying assembly includes a support plate arranged at the bottom end of the moving block, the bottom end of the support plate is provided with a rotating rod one, the middle part of the rotating rod one is provided with a rotating rod two, and the rotating rod two is arranged perpendicular to the rotating rod one, brackets are arranged on both sides of the rotating rod two, and the bottom end of the bracket is penetrated by the glue gun, and a top side of the support plate is provided with a placement Plate one, an electric telescopic rod one is arranged through the top of the placement plate one, a rack one is arranged at the output end of the electric telescopic rod one, a meshing gear one is arranged on one side of the rack one, and the middle part of the gear one is arranged on the rotating rod one, a limiting rod one is arranged on the other side of the rack one, and the limiting rod one is arranged at one end of the rotating rod one, a placement plate two is arranged on the side wall of the bottom end of the bracket, an electric telescopic rod two is arranged on one side of the placement plate two, a rack two is arranged at the output end of the electric telescopic rod two, a meshing gear two is arranged on the side wall of one end of the rack two, and the middle part of the gear two is arranged on the rotating rod two, a limiting rod two is arranged on the side wall of the other end of the rack two, and the limiting rod two is arranged on one side of the rotating rod two, and the bracket includes rotating columns arranged on both sides of the rotating rod two, a rotating hole is opened in the middle of the rotating column, and a U-shaped frame is arranged on the circumferential wall of the two rotating holes.

[0011] The beneficial effects of the utility model are:

[0012] 1. The utility model has a reasonable and reliable structure and is easy to operate. Under the action of the moving component, the glue gun can be automatically adjusted horizontally, which saves manpower and improves work efficiency. At the same time, the stability of the glue gun during the adjustment process is guaranteed. Under the action of the adjusting component, the glue gun can be adjusted longitudinally, so as to adapt to the glue spraying efficiency of folding jigs of different lengths. At the same time, under the action of the glue spraying component, by driving the gear 1 and the gear 1 to rotate, the rotating rod 1 rotates, which drives the bracket to rotate forward and backward. Then, through the movement of the electric telescopic rod 2, the rack 2 drives the gear 2 to rotate, so that the rotating rod 2 rotates, which drives the bracket to rotate left and right, and then the angle of the glue spraying gun is adjusted, so that the glue spraying gun can spray glue on the folding jig at multiple angles, thereby improving the glue spraying efficiency of the glue spraying device.

[0013] 2. By setting up a moving component, the glue gun can be automatically adjusted laterally under the action of the moving component, thereby saving manpower and improving work efficiency. At the same time, it also ensures the stability of the glue gun during the adjustment process, thereby improving the glue spraying effect of the glue spraying device.

[0014] 3. By setting an adjustment component, under the action of the adjustment component, the two bevel gears 2 drive the two bevel gears 1 to rotate, and the rotation of the bevel gear 1 drives the two threaded rods 2 to rotate, and the rotation of the threaded rod 2 drives the slider to move, so that the longitudinal adjustment of the glue gun is achieved under the action of the slider and the moving frame, and the glue spraying efficiency of folding fixtures of different lengths is suitable, thereby improving work efficiency.

[0015] 4. By setting up a glue spraying assembly, under the action of the glue spraying assembly, the electric telescopic rod 1 is extended and retracted, which drives the gear 1 to move, and the driving gear 1 rotates, which drives the rotating rod to rotate, and then drives the bracket to rotate forward and backward, thereby adjusting the angle of the glue spraying gun. Then, the electric telescopic rod 2 moves, which drives the rack 2 to rotate the driving gear 2, so that the rotating rod 2 rotates, and then drives the bracket to rotate left and right, thereby adjusting the angle of the glue spraying gun, so that the glue spraying gun can perform glue spraying work on the folding jig at multiple angles, thereby improving the glue spraying efficiency of the glue spraying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a three-dimensional diagram of a folding jig glue spraying device according to an embodiment of the utility model;

[0018] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0019] Figure 3 is a cross-sectional view of a folding jig glue spraying device according to an embodiment of the utility model;

[0020] Figure 4 It is a structural schematic diagram of a glue spraying assembly in a glue spraying device for a folding jig according to an embodiment of the utility model;

[0021] Figure 5 It is a structural schematic diagram of another angle of a glue spraying assembly in a glue spraying device for a folding jig according to an embodiment of the utility model;

[0022] Figure 6 It is a structural schematic diagram of a bracket in a folding jig glue spraying device according to an embodiment of the utility model.

[0023] In the figure:

[0024] 1. Operation table; 2. Sliding groove; 3. Sliding block; 4. Moving frame; 5. Moving assembly; 501. Limiting slide bar; 502. Threaded rod 1; 503. Servo motor 1; 504. Moving block; 6. Frame; 7. Adjusting assembly; 701. Threaded rod 2; 702. Bevel gear 1; 703. Bevel gear 2; 704. Rotating shaft; 705. Servo motor 2; 8. Glue spraying assembly; 801. Support plate; 802. Rotating rod 1; 803. Rotating rod 2; 804. Bracket; 805. Glue spraying gun; 8 06. Placement plate 1; 807. Electric telescopic rod 1; 808. Rack 1; 809. Gear 1; 8010. Limit rod 1; 8011. Placement plate 2; 8012. Electric telescopic rod 2; 8013. Rack 2; 8014. Gear 2; 8015. Limit rod 2; 8016. Rotating column; 8017. Rotating hole; 8018. U-shaped frame; 9. Fixed plate; 10. Hydraulic rod; 11. Fixed frame; 12. Spring; 13. Clamping plate; 14. Folding fixture body; 15. Control panel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] According to an embodiment of the utility model, a folding jig glue spraying device is provided.

[0027] The present invention is now further described in conjunction with the accompanying drawings and specific implementation methods. Figure 1-Figure 6 As shown, the folding jig glue spraying device according to the embodiment of the utility model includes an operating table 1, symmetrical sliding grooves 2 are opened on both sides of the top of the operating table 1, and sliders 3 are arranged inside the sliding grooves 2. In specific applications, a side wall at one end of the slider 3 is opened with a threaded hole matching the threaded rod 701, a moving frame 4 is arranged between the tops of the two sliders 3, and a moving component 5 is arranged at the inner top of the moving frame 4. A frame 6 is arranged at one end of the operating table 1, and an adjustment component 7 is arranged inside the frame 6. A glue spraying component 8 is arranged at the bottom end of the moving component 5, and fixed plates 9 are symmetrically arranged at both ends of the top of the operating table 1, and hydraulic rods 10 are penetrated through the side walls of one end of the fixed plate 9, and the ends of the hydraulic rods 10 are connected to fixed frames 11, and a plurality of springs 12 are arranged on the inner walls of both sides of the fixed frame 11, and a clamping plate 13 is arranged on one side of the spring 12. A folding jig body 14 is arranged between the two groups of clamping plates 13, and a control panel 15 is arranged on one side of the operating table 1.

[0028] In addition, the working principles and structures of the hydraulic rod 10, the folding fixture body 14, the servo motor 503, the servo motor 705, the glue gun 805, the electric telescopic rod 1 807, the electric telescopic rod 2 8012 and the glue sprayer are all prior arts and will not be elaborated in detail here.

[0029] In one embodiment, for the above-mentioned moving component 5, the moving component 5 includes a limiting slide bar 501 symmetrically arranged on the two side walls of the top of the moving frame 4, a threaded rod 502 is arranged between the two limiting slide bars 501, and a servo motor 503 connected to the threaded rod 502 is penetrated on one side of the moving frame 4, and the circumferential outer part of the limiting slide bar 501 and the threaded rod 502 is sleeved with a moving block 504 matching therewith, so that under the action of the moving component 5, the lateral automatic adjustment of the glue gun 805 can be realized, thereby saving manpower and improving work efficiency. At the same time, it also ensures the stability of the glue gun 805 during the adjustment process, thereby improving the glue spraying effect of the glue spraying device.

[0030] The specific working principle of the moving component 5 is as follows: by starting the servo motor 503, and driving the threaded rod 502 to rotate under the action of the output shaft of the servo motor 503, the threaded rod 502 drives the moving block 504 to move, and the moving block 504 slides stably under the action of the limiting slide bar 501, thereby realizing the lateral automatic adjustment of the glue gun 805.

[0031] In one embodiment, for the above-mentioned adjustment component 7, the adjustment component 7 includes two threaded rods 701 that penetrate the side wall of one end of the slider 3, one end of the two threaded rods 701 penetrates the side wall of one end of the frame 6 and is provided with a bevel gear 702, one side of the bevel gear 702 is meshed with a bevel gear 703, a rotating shaft 704 is provided between the two bevel gears 703, one side of the rotating shaft 704 penetrates the side of the frame 6 and is provided with a servo motor 705, and the thread directions of the two threaded rods 701 are opposite, so that under the action of the adjustment component 7, the two bevel gears 702 are driven to rotate by the two bevel gears 703, and the rotation of the bevel gear 702 drives the two threaded rods 701 to rotate, and the rotation of the threaded rod 701 drives the slider 3 to move, thereby realizing the longitudinal adjustment of the glue gun 805 under the action of the slider 3 and the moving frame 4, and the glue spraying efficiency of folding jigs of different lengths is suitable, thereby improving the work efficiency.

[0032] The specific working principle of the adjustment component 7 is as follows: the servo motor 2 705 is started through the control panel 15 to drive the rotating shaft 704 to rotate, and the rotating shaft 704 drives the bevel gear 2 703 to rotate, and the rotation of the bevel gear 2 703 drives the bevel gear 1 702 to rotate, and the rotation of the bevel gear 1 702 drives the threaded rod 2 701 to rotate, and the threaded rod 2 701 drives the slider 3 and the movable frame 4 to reciprocate longitudinally with the cooperation of the threaded hole, and the longitudinal reciprocating motion of the movable frame 4 drives the glue gun 805 to reciprocate longitudinally.

[0033] In one embodiment, for the above-mentioned glue spraying assembly 8, the glue spraying assembly 8 includes a support plate 801 arranged at the bottom end of the moving block 504, a rotating rod 1 802 is arranged at the bottom end of the support plate 801, a rotating rod 2 803 is arranged in the middle of the rotating rod 1 802, and the rotating rod 2 803 is arranged vertically with the rotating rod 1 802, brackets 804 are arranged on both sides of the rotating rod 2 803, and a glue spraying gun 805 is arranged through the bottom end of the bracket 804. In specific applications, a connecting pipe connected to the glue spraying machine is arranged at the top of the glue spraying gun 805, and the connecting pipe is connected to the glue spraying machine through a hose. A placing plate 806 is provided on one side of the top, an electric telescopic rod 807 is provided through the top of the placing plate 806, a rack 808 is provided on the output end of the electric telescopic rod 807, a meshing gear 809 is provided on one side of the rack 808, and the middle part of the gear 809 is provided on the rotating rod 802, a limiting rod 8010 is provided on the other side of the rack 808, and the limiting rod 8010 is provided at one end of the rotating rod 802, a placing plate 8011 is provided on the side wall of one end of the bottom of the bracket 804, and an electric telescopic rod 8012 is provided on one side of the placing plate 8011, The output end of the electric telescopic rod 8012 is provided with a rack 8013, and a meshing gear 8014 is provided on the side wall of one end of the rack 8013, and the middle part of the gear 8014 is provided on the rotating rod 803, and the other end side wall of the rack 8013 is provided with a limit rod 8015, and the limit rod 8015 is provided on one side of the rotating rod 803, and the bracket 804 includes a rotating column 8016 arranged on both sides of the rotating rod 803, and the middle part of the rotating column 8016 is provided with a rotating hole 8017, and a U-shaped frame 8018 is provided on the circumferential wall of the two rotating holes 8017, so that when the spray Under the action of the glue component 8, the electric telescopic rod 807 is extended and retracted, which drives the gear 809 to move, and the gear 809 is driven to rotate, which makes the rotating rod 802 rotate, and drives the bracket 804 to rotate back and forth, so as to adjust the angle of the glue gun 805, and then the electric telescopic rod 8012 moves, which drives the rack 8013 to drive the gear 8014 to rotate, so that the rotating rod 803 rotates, and drives the bracket 804 to rotate left and right, and then adjusts the angle of the glue gun 805, so that the glue gun 805 can spray glue on the folding jig at multiple angles, thereby improving the glue spraying efficiency of the glue spraying device.

[0034] The specific working principle of the glue spraying assembly 8 is as follows: by starting the electric telescopic rod 807 to extend and retract, the gear 809 is driven to move, and the gear 809 is driven to rotate, which makes the rotating rod 802 rotate, and then drives the bracket 804 to rotate back and forth, so as to adjust the angle of the glue spraying gun 805, and then the electric telescopic rod 8012 moves, which drives the rack 8013 to drive the gear 8014 to rotate, so that the rotating rod 803 rotates, and drives the bracket 804 to rotate left and right, and then adjusts the angle of the glue spraying gun 805, so that the glue spraying gun 805 can spray glue at multiple angles on the folding jig.

[0035] In order to facilitate understanding of the above technical solution of the present invention, the working principle or operation method of the present invention in the actual process is described in detail below.

[0036] In actual application, the hydraulic rod 10 is started through the control panel 15 to drive the two sets of fixed plates 9 to move inward, and the two sides of the folding jig body 14 that need to be sprayed with glue are placed between the two sets of clamping plates 13 and fixed under the action of the spring 12. Then, according to the size and shape of the folding jig body 14, the moving component 5, the adjustment component 7 and the glue spraying component 8 are started at the same time to spray the folding jig body 14 horizontally, vertically and at multiple angles.

[0037] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A folding jig glue spraying device, comprising an operating table (1), characterized in that: Symmetrical sliding grooves (2) are provided on both sides of the top of the operating table (1), and sliding blocks (3) are provided inside the sliding grooves (2). A moving frame (4) is provided between the tops of the two sliding blocks (3), and a moving component (5) is provided at the inner top of the moving frame (4). A frame (6) is provided at one end of the operating table (1), and an adjusting component (7) is provided inside the frame (6). A glue spraying component (8) is provided at the bottom end of the moving component (5), and fixed plates (9) are symmetrically provided at both ends of the top of the operating table (1); A hydraulic rod (10) is provided through the side wall of one end of the fixing plate (9), the ends of the hydraulic rod (10) are connected to a fixing frame (11), a plurality of springs (12) are provided on the inner walls of both sides of the fixing frame (11), a clamping plate (13) is provided on one side of the spring (12), a folding jig body (14) is provided between two groups of the clamping plates (13), and a control panel (15) is provided on one side of the operating table (1).

2. A folding jig glue spraying device according to claim 1, characterized in that: The moving assembly (5) comprises limiting slide bars (501) symmetrically arranged on the two side walls of the top of the moving frame (4), a threaded rod (502) is arranged between the two limiting slide bars (501), a servo motor (503) connected to the threaded rod (502) is arranged on one side of the moving frame (4), and a moving block (504) matching with the limiting slide bars (501) and the threaded rod (502) is sleeved on the outer circumference of the limiting slide bars (501) and the threaded rod (502).

3. A folding jig glue spraying device according to claim 2, characterized in that: The adjustment assembly (7) comprises two threaded rods (701) penetrating through the side wall of one end of the slider (3); one end of each of the threaded rods (701) penetrating through the side wall of one end of the frame (6) is provided with a bevel gear (702); one side of each of the bevel gears (702) is meshed with a bevel gear (703).

4. A folding jig glue spraying device according to claim 3, characterized in that: A rotating shaft (704) is arranged between the two bevel gears (703), one side of the rotating shaft (704) passes through the frame (6), and a servo motor (705) is arranged on one side. The thread directions of the two threaded rods (701) are opposite.

5. The folding jig glue spraying device according to claim 4, characterized in that: The glue spraying assembly (8) comprises a support plate (801) arranged at the bottom end of the moving block (504), a rotating rod 1 (802) is arranged at the bottom end of the support plate (801), a rotating rod 2 (803) is arranged in the middle of the rotating rod 1 (802), and the rotating rod 2 (803) is arranged perpendicular to the rotating rod 1 (802), brackets (804) are arranged on both sides of the rotating rod 2 (803), and a glue spraying gun (805) is arranged through the bottom end of the bracket (804).

6. A folding jig glue spraying device according to claim 5, characterized in that: A placement plate (806) is provided on one side of the top of the support plate (801), an electric telescopic rod (807) is provided through the top of the placement plate (806), a rack (808) is provided at the output end of the electric telescopic rod (807), a meshing gear (809) is provided on one side of the rack (808), and the middle part of the gear (809) is provided on the rotating rod (802), a limit rod (8010) is provided on the other side of the rack (808), and the limit rod (8010) is provided at one end of the rotating rod (802).

7. The folding jig glue spraying device according to claim 6, characterized in that: A second placement plate (8011) is disposed on a side wall at one end of the bottom of the bracket (804); a second electric telescopic rod (8012) is disposed on one side of the second placement plate (8011); a second rack (8013) is disposed at the output end of the second electric telescopic rod (8012); a second gear (8014) meshing with the second gear (8014) is disposed on a side wall at one end of the second rack (8013); and a middle portion of the second gear (8014) is disposed on the second rotating rod (803); a second limiting rod (8015) is disposed on a side wall at the other end of the second rack (8013); and the second limiting rod (8015) is disposed on one side of the second rotating rod (803).

8. The folding jig glue spraying device according to claim 7, characterized in that: The bracket (804) includes rotating columns (8016) arranged on both sides of the second rotating rod (803), and the middle of each rotating column (8016) is provided with a rotating hole (8017), and a U-shaped frame (8018) is arranged on the circumferential wall of the two rotating holes (8017).

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