Automatic packaging equipment

Abstract

The utility model discloses automatic packaging equipment which comprises an installation frame, a first conveying belt is connected to one side of the installation frame, a mechanical arm is installed at the position, located at one end of the first conveying belt, of the top of the installation frame, a second conveying belt and a third conveying belt are installed at the top of the installation frame, and the second conveying belt is located between the first conveying belt and the third conveying belt. A heat sealing mechanism used for sealing a packaging film is arranged between the second conveying belt and the third conveying belt, a packaging film conveying mechanism used for conveying the packaging film is arranged at the bottom of the second conveying belt, and mounting plates are symmetrically and fixedly connected to the position, below the second conveying belt, of the top of the mounting frame; according to the packaging equipment, simultaneous operation of the second conveying belt, the third conveying belt and the packaging film conveying mechanism can be achieved only through cooperative work of the control system and the driving motor of the packaging equipment, the good linkage effect is achieved, the electric power operation cost of the equipment is saved, and meanwhile the packaging efficiency of knives, forks and spoons is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of knife, fork and spoon production, in particular to an automatic packaging device. Background Art

[0002] Knives, forks and spoons are the most commonly used tableware in life. In order to avoid damage caused by collisions between production and sales, they need to be bagged and packaged separately, especially in some sets of disposable tableware.

[0003] The existing cutlery and fork packaging equipment requires manual cooperation to pick up the cutlery during the packaging process, which has a low degree of automation and low packaging efficiency. The structure of the existing cutlery packaging equipment is cumbersome and the equipment operation cost is high. Therefore, we propose an automated packaging equipment. Utility Model Content

[0004] The purpose of the present invention is to provide an automated packaging 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: an automated packaging equipment, comprising a mounting frame, one side of the mounting frame is connected to a first conveyor belt, the top of the mounting frame is located at one end of the first conveyor belt and a robot is installed, the top of the mounting frame is respectively installed with a second conveyor belt and a third conveyor belt, the second conveyor belt is located between the first conveyor belt and the third conveyor belt, a heat sealing mechanism for sealing the packaging film is arranged between the second conveyor belt and the third conveyor belt, and a packaging film conveying mechanism for conveying the packaging film is arranged at the bottom of the second conveyor belt.

[0006] Preferably, the packaging film conveying mechanism includes a mounting plate, a mounting rod, a feeding shaft, a support frame, a first supporting roller, a second supporting roller and a conveying roller, the top of the mounting frame is located below the second conveyor belt and is symmetrically fixed to the mounting plate, the top and bottom ends between the two mounting plates are rotatably connected to the conveying rollers, the two mounting plates are installed with a support frame at one end away from the conveying rollers, and the support frame is located at one end of the conveying roller and is rotatably connected to the first supporting roller, the support frame is rotatably connected to the second supporting roller at one end away from the first supporting roller, the bottom end of the mounting plate is installed with a mounting rod, and the end of the mounting rod is installed with a feeding shaft, and the outer side of the feeding shaft is sleeved with a packaging film roll.

[0007] Preferably, the top of the mounting frame is located at one end of the first conveyor belt and is fixedly connected to a column, and an X-axis linear guide is provided on the top of the column, two Y-axis linear guides are slidably provided on the top of the X-axis linear guide, a Z-axis linear guide is slidably provided between the two Y-axis linear guides, and a robot is slidably provided on the surface of the Z-axis linear guide.

[0008] Preferably, the end of the conveying roller is fixedly connected to the third pulley through the mounting plate, the height of the second conveyor belt and the third conveyor belt are equal, the second conveyor belt and the third conveyor belt are rotatably connected to the tensioning roller, and the height of the tensioning roller is lower than the height of the rotating roller of the second conveyor belt and the third conveyor belt, the ends of the tensioning rollers in the second conveyor belt and the third conveyor belt are fixedly connected to the first pulley, and the two first pulleys are connected by belt transmission, the outside of the tensioning roller in the third conveyor belt is rotatably connected to the adjusting roller, and the end of the adjusting roller is fixedly connected to the fourth pulley, the top end of the third conveyor belt is rotatably connected to the second pulley, and the bottom of the third conveyor belt is fixedly installed with a driving motor, the output shaft end of the driving motor is fixedly connected to the driving wheel, and the second pulley, the third pulley, the fourth pulley and the driving wheel are connected by belt transmission.

[0009] Preferably, the heat bonding mechanism includes a fixed frame, a support plate, a lifting cylinder, an upper heat bonding plate, a bottom plate, a spring and a lower heat bonding plate, a fixed frame is fixedly connected between the second conveyor belt and the third conveyor belt, the fixed frame is fixedly connected to the support plate, the top of the support plate is fixedly installed with a lifting cylinder, and the end of the piston rod of the lifting cylinder passes through the support plate and is fixedly connected to the upper heat bonding plate, the fixed frame is symmetrically fixedly connected with a sliding rod, the two ends of the support plate are slidably connected to the outside of the two sliding rods, the outside of the sliding rod in the fixed frame is slidably connected to the bottom plate, the bottom plate is located below the support plate, the top of the bottom plate is symmetrically fixedly connected with a spring, and the tops of the two springs are fixedly connected to the lower heat bonding plate, and the lower heat bonding plate is located directly below the upper heat bonding plate.

[0010] Preferably, a telescopic cylinder is fixedly connected to the top end of the side wall of the fixing frame, a connecting rod is rotatably connected to the middle portion of both ends of the support plate, and the end portion of the connecting rod is rotatably connected to the bottom plate.

[0011] Preferably, the connecting rod includes three rotatably connected connecting rods, and both ends of the connecting rod are rotatably connected to the support plate and the bottom plate respectively, and the middle part of the connecting rod is rotatably connected to the fixing frame through a rotating shaft.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model can flexibly adjust the manipulator in the X-axis direction, the Y-axis direction and the Z-axis direction through the coordinated arrangement of the X-axis linear guide, the Y-axis linear guide and the Z-axis linear guide, so that the cutlery and fork conveyed on the first conveyor belt can be quickly transferred to the second conveyor belt, saving manpower operation costs and improving the efficiency of packaging cutlery and fork.

[0014] 2. The utility model can realize the simultaneous operation of the second conveyor belt, the third conveyor belt and the packaging film conveying mechanism only through the coordinated work of the control system and the drive motor provided in the device, thereby achieving a better linkage effect, saving the electricity operation cost of the equipment, and greatly improving the packaging efficiency of cutlery and spoons. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the enlarged view of point A of the present utility model;

[0018] Figure 4 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the enlarged view of point B of the present utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the enlarged view of point C of the present invention.

[0021] In the figure: 1. Mounting frame; 2. First conveyor belt; 3. Robot; 4. X-axis linear guide; 5. Y-axis linear guide; 6. Z-axis linear guide; 7. Second conveyor belt; 8. Third conveyor belt; 9. Packaging film conveying mechanism; 10. Tensioning roller; 11. Adjusting roller; 12. First pulley; 13. Second pulley; 14. Mounting plate; 15. Mounting rod; 16. Feeding shaft; 17. Support frame; 18. First support roller; 19. Second support roller; 20. Conveyor roller; 21. Third pulley; 22. Fixed frame; 23. Support plate; 24. Lifting cylinder; 25. Upper heat sealing plate; 26. Bottom plate; 27. Spring; 28. Lower heat sealing plate; 29. Telescopic cylinder; 30. Heat sealing mechanism; 31. Connecting rod; 32. Drive motor. DETAILED DESCRIPTION

[0022] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-6The utility model provides a technical solution: an automated packaging equipment, including a mounting frame 1, one side of the mounting frame 1 is connected to a first conveyor belt 2, the top of the mounting frame 1 is located at one end of the first conveyor belt 2 and a manipulator 3 is installed, the top of the mounting frame 1 is respectively installed with a second conveyor belt 7 and a third conveyor belt 8, the second conveyor belt 7 is located between the first conveyor belt 2 and the third conveyor belt 8, a heat sealing mechanism 30 for sealing the packaging film is arranged between the second conveyor belt 7 and the third conveyor belt 8, and a packaging film conveying mechanism 9 for conveying the packaging film is arranged at the bottom of the second conveyor belt 7.

[0024] It should be noted that when the present invention is in use, the processed cutlery, fork and spoon are transported to the mounting frame 1 through the first conveyor belt 2. Through the coordinated arrangement of the X-axis linear guide 4, the Y-axis linear guide 5 and the Z-axis linear guide 6, the manipulator 3 can be controlled to move flexibly in multiple directions, so that the manipulator 3 transfers the cutlery, fork and spoon transported to the mounting frame 1 to the second conveyor belt 7. The control system provided in the device controls the drive motor 32 to operate, so that the second pulley 13, the third pulley 21, the first pulley 12 and the adjusting roller 11 rotate at the same time. Through the transmission connection between the first pulley 12 at the ends of the two tensioning rollers 10 on the second conveyor belt 7 and the third conveyor belt 8, the second conveyor belt 7 and the third conveyor belt 8 can realize the transportation of materials by the second conveyor belt 7 and the third conveyor belt 8. At the same time, the drive motor 32 can drive the packaging film conveying mechanism 9. The conveyor roller 20 rotates to convey the packaging film. The packaging film passes through the gap between the second conveyor belt 7 and the first conveyor belt 2 and is adhered to the surface of the second conveyor belt 7 for conveying. When the manipulator 3 places the cutlery, fork and spoon on the packaging film conveyed on the second conveyor belt 7, the cutlery, fork and spoon are conveyed together on the packaging film. When they are conveyed to the heat sealing mechanism 30, the lifting cylinder 24 works, and the piston rod of the lifting cylinder 24 extends, pushing the middle part of the connecting rod 31 to rotate. Under the action of the connecting rod 31, the bottom plate 26 is pulled down, thereby causing the lower heat sealing plate 28 to slide down, so that the packaged cutlery, fork and spoon are placed between the lower heat sealing plate 28 and the upper heat sealing plate 25. At this time, the lifting cylinder 24 works to control the upper heat sealing plate 25 to be pressed down to the lower heat sealing plate 28, so that the cutlery, fork and spoon can be packaged in the packaging film, and finally the packaged cutlery, fork and spoon are conveyed out through the third conveyor belt 8.

[0025] The packaging film conveying mechanism 9 includes a mounting plate 14, a mounting rod 15, a loading shaft 16, a support frame 17, a first support roller 18, a second support roller 19 and a conveying roller 20. The top of the mounting frame 1 is located below the second conveyor belt 7 and is symmetrically fixedly connected to the mounting plate 14. The top and bottom ends between the two mounting plates 14 are rotatably connected to the conveying roller 20.

[0026] It should be noted that the conveying roller 20 at the top of the mounting plate 14 is in a passive drive state, and the end of the conveying roller 20 at the bottom of the mounting plate 14 is fixedly connected to the third pulley 21, and the packaging film is placed between the two conveying rollers 20 and transported.

[0027] A support frame 17 is installed at one end of the two mounting plates 14 away from the conveying roller 20, and the support frame 17 is located at one end of the conveying roller 20 and is rotatably connected to the first support roller 18. The end of the support frame 17 away from the first support roller 18 is rotatably connected to the second support roller 19. A mounting rod 15 is installed at the bottom end of the mounting plate 14, and a loading shaft 16 is installed at the end of the mounting rod 15. A packaging film roll is sleeved on the outer side of the loading shaft 16.

[0028] It should be noted that the first support roller 18 and the second support roller 19 are used to tension the second conveyor belt 7 and the third conveyor belt 8 respectively. When the second conveyor belt 7 and the third conveyor belt 8 convey the packaging film, the first support roller 18 and the second support roller 19 can also play a role in guiding the packaging film waste.

[0029] The top of the mounting frame 1 is located at one end of the first conveyor belt 2 and is fixedly connected to a column, and an X-axis linear guide 4 is provided on the top of the column, and two Y-axis linear guides 5 are slidably provided on the top of the X-axis linear guide 4, and a Z-axis linear guide 6 is slidably provided between the two Y-axis linear guides 5, and a robot 3 is slidably provided on the surface of the Z-axis linear guide 6.

[0030] It should be noted that, through the coordinated arrangement of the X-axis linear guide 4, the Y-axis linear guide 5 and the Z-axis linear guide 6, the manipulator 3 can be controlled to move flexibly in multiple directions, so that the manipulator 3 can transfer the cutlery, fork and spoon delivered to the mounting bracket 1 to the second conveyor belt 7.

[0031] The end of the conveying roller 20 is fixedly connected to the third pulley 21 through the mounting plate 14. The heights of the second conveyor belt 7 and the third conveyor belt 8 are equal. The second conveyor belt 7 and the third conveyor belt 8 are both rotatably connected with a tensioning roller 10, and the height of the tensioning roller 10 is lower than the height of the rotating rollers of the second conveyor belt 7 and the third conveyor belt 8.

[0032] It should be noted that the second conveyor belt 7 and the third conveyor belt 8 can be tensioned by the tensioning roller 10, thereby ensuring the conveying effect of the second conveyor belt 7 and the third conveyor belt 8 on the cutlery, fork and spoon.

[0033] The ends of the tensioning rollers 10 in the second conveyor belt 7 and the third conveyor belt 8 are fixedly connected to the first pulley 12, and the two first pulleys 12 are connected by belt transmission. The third conveyor belt 8 is rotatably connected to the outside of the tensioning roller 10 with an adjusting roller 11, and the end of the adjusting roller 11 is fixedly connected to the fourth pulley. The top of the third conveyor belt 8 is rotatably connected to the second pulley 13. The bottom of the third conveyor belt 8 is fixedly installed with a driving motor 32, and the output shaft end of the driving motor 32 is fixedly connected to the driving wheel. The second pulley 13, the third pulley 21, the fourth pulley and the driving wheel are connected by belt transmission.

[0034] It should be noted that the control system provided in the device controls the operation of the drive motor 32, so that the second pulley 13, the third pulley 21, the first pulley 12 and the adjusting roller 11 rotate simultaneously, and the transmission connection between the first pulley 12 at the end of the two tensioning rollers 10 on the second conveyor belt 7 and the third conveyor belt 8 is realized to convey the material. At the same time, the drive motor 32 can drive the conveying roller 20 of the packaging film conveying mechanism 9 to rotate, and convey the packaging film. The packaging film passes through the gap between the second conveyor belt 7 and the first conveyor belt 2, and is adhered to the surface of the second conveyor belt 7 for transportation.

[0035] The heat sealing mechanism 30 includes a fixed frame 22, a support plate 23, a lifting cylinder 24, an upper heat sealing plate 25, a bottom plate 26, a spring 27 and a lower heat sealing plate 28. The fixed frame 22 is fixedly connected between the second conveyor belt 7 and the third conveyor belt 8. The support plate 23 is fixedly connected inside the fixed frame 22. The top of the support plate 23 is fixedly installed with a lifting cylinder 24, and the piston rod end of the lifting cylinder 24 passes through the support plate 23 and is fixedly connected to the upper heat sealing plate 25. The fixed frame 22 is symmetrically fixed with sliding rods. The two ends of the support plate 23 are slidably connected to the outside of the two sliding rods. The outside of the sliding rod in the fixed frame 22 is slidably connected to the bottom plate 26. The bottom plate 26 is located below the support plate 23. The top of the bottom plate 26 is symmetrically fixed with springs 27, and the top of the two springs 27 is fixedly connected to the lower heat sealing plate 28. The lower heat sealing plate 28 is located directly below the upper heat sealing plate 25.

[0036] It should be noted that when the cutlery, fork and spoon and the packaging film are transported to the heat-sealing mechanism 30, the lifting cylinder 24 works, and the piston rod of the lifting cylinder 24 extends, pushing the middle part of the connecting rod 31 to rotate. Under the action of the connecting rod 31, the bottom plate 26 is pulled down, thereby causing the lower heat-sealing plate 28 to slide down, so that the packaged cutlery, fork and spoon are placed between the lower heat-sealing plate 28 and the upper heat-sealing plate 25. At this time, the lifting cylinder 24 works, controlling the upper heat-sealing plate 25 to be pressed down to the lower heat-sealing plate 28, so that the cutlery, fork and spoon can be packaged in the packaging film, and finally the packaged cutlery, fork and spoon are transported out through the third conveyor belt 8.

[0037] A telescopic cylinder 29 is fixedly connected to the top end of the side wall of the fixing frame 22 , and a connecting rod 31 is rotatably connected to the middle of both ends of the support plate 23 , and the end of the connecting rod 31 is rotatably connected to the bottom plate 26 .

[0038] It should be noted that the extension and retraction of the telescopic cylinder 29 can control the lifting and lowering of the support plate 23 under the action of the connecting rod 31. When the support plate 23 descends, the lower heat-sealing plate 28 is separated from the upper heat-sealing plate 25. Under the action of the second conveyor belt 7, the knife, fork and spoon can be transported to the lower heat-sealing plate 28. The lifting cylinder 24 works to make the upper heat-sealing plate 25 contact with the lower heat-sealing plate 28 to seal the packaging film.

[0039] The connecting rod 31 includes three rotatably connected connecting rods, and both ends of the connecting rod are rotatably connected to the support plate 23 and the bottom plate 26 respectively. The middle part of the connecting rod 31 is rotatably connected to the fixing frame 22 through a rotating shaft.

[0040] It should be noted that this arrangement can indirectly drive the lifting of the support plate 23 by driving the connecting rod 31 through the telescopic cylinder 29 .

[0041] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0043] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like 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 present invention according to the specific circumstances.

[0044] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automated packaging device, comprising a mounting frame (1), characterized in that: One side of the mounting frame (1) is connected to a first conveyor belt (2), a manipulator (3) is installed at one end of the first conveyor belt (2) at the top of the mounting frame (1), a second conveyor belt (7) and a third conveyor belt (8) are installed at the top of the mounting frame (1), the second conveyor belt (7) is located between the first conveyor belt (2) and the third conveyor belt (8), a heat sealing mechanism (30) for sealing the packaging film is provided between the second conveyor belt (7) and the third conveyor belt (8), and a packaging film conveying mechanism (9) for conveying the packaging film is provided at the bottom of the second conveyor belt (7).

2. The automated packaging equipment according to claim 1, characterized in that: The packaging film conveying mechanism (9) comprises a mounting plate (14), a mounting rod (15), a feeding shaft (16), a support frame (17), a first supporting roller (18), a second supporting roller (19) and a conveying roller (20), wherein the top of the mounting frame (1) is located below the second conveyor belt (7) and is symmetrically fixedly connected to the mounting plate (14), the top and bottom ends between the two mounting plates (14) are both rotatably connected to the conveying roller (20), the two mounting plates (14) are mounted with a support frame (17) at one end away from the conveying roller (20), and the support frame (17) is located at one end of the conveying roller (20) and is rotatably connected to the first supporting roller (18), and the support frame (17) is located at one end of the conveying roller (18) and is rotatably connected to the second supporting roller (19), the bottom end of the mounting plate (14) is mounted with a mounting rod (15), and the end of the mounting rod (15) is mounted with a feeding shaft (16), and the outer side of the feeding shaft (16) is provided with a packaging film roll.

3. The automated packaging equipment according to claim 2, characterized in that: The top of the mounting frame (1) is located at one end of the first conveyor belt (2) and is fixedly connected to a column, and an X-axis linear guide rail (4) is provided on the top of the column, two Y-axis linear guide rails (5) are slidably provided on the top of the X-axis linear guide rail (4), a Z-axis linear guide rail (6) is slidably provided between the two Y-axis linear guide rails (5), and a robot (3) is slidably provided on the surface of the Z-axis linear guide rail (6).

4. The automated packaging equipment according to claim 2, characterized in that: The end of the conveying roller (20) passes through the mounting plate (14) and is fixedly connected to the third pulley (21). The heights of the second conveyor belt (7) and the third conveyor belt (8) are equal. The second conveyor belt (7) and the third conveyor belt (8) are both rotatably connected to a tensioning roller (10), and the height of the tensioning roller (10) is lower than the height of the rotating rollers of the second conveyor belt (7) and the third conveyor belt (8). The ends of the tensioning rollers (10) in the second conveyor belt (7) and the third conveyor belt (8) are both fixedly connected to the first pulley (12), and the two first pulleys (12 ) are connected by belt transmission, an adjusting roller (11) is rotatably connected to the outside of the tensioning roller (10) in the third conveyor belt (8), and the end of the adjusting roller (11) is fixedly connected to the fourth pulley, the top of the third conveyor belt (8) is rotatably connected to the second pulley (13), the bottom of the third conveyor belt (8) is fixedly installed with a driving motor (32), the output shaft end of the driving motor (32) is fixedly connected to the driving wheel, and the second pulley (13), the third pulley (21), the fourth pulley and the driving wheel are connected by belt transmission.

5. The automated packaging equipment according to claim 4, characterized in that: The heat sealing mechanism (30) comprises a fixed frame (22), a support plate (23), a lifting cylinder (24), an upper heat sealing plate (25), a bottom plate (26), a spring (27) and a lower heat sealing plate (28); a fixed frame (22) is fixedly connected between the second conveyor belt (7) and the third conveyor belt (8); a support plate (23) is fixedly connected inside the fixed frame (22); a lifting cylinder (24) is fixedly installed on the top of the support plate (23); and the end of the piston rod of the lifting cylinder (24) passes through the support plate (23) and is fixed An upper heat-sealing plate (25) is connected, a sliding rod is symmetrically fixedly connected inside the fixing frame (22), two ends of the support plate (23) are slidably connected to the outside of the two sliding rods, a bottom plate (26) is slidably connected to the outside of the sliding rod inside the fixing frame (22), the bottom plate (26) is located below the support plate (23), a spring (27) is symmetrically fixedly connected to the top of the bottom plate (26), and a lower heat-sealing plate (28) is fixedly connected to the top of the two springs (27), and the lower heat-sealing plate (28) is located directly below the upper heat-sealing plate (25).

6. The automated packaging equipment according to claim 5, characterized in that: The top end of the side wall of the fixing frame (22) is fixedly connected to a telescopic cylinder (29), the middle portions of the two ends of the support plate (23) are rotatably connected to connecting rods (31), and the ends of the connecting rods (31) are rotatably connected to the bottom plate (26).

7. The automated packaging equipment according to claim 6, characterized in that: The connecting rod (31) includes three rotatably connected connecting rods, and the two ends of the connecting rod are rotatably connected to the support plate (23) and the bottom plate (26) respectively. The middle part of the connecting rod (31) is rotatably connected to the fixing frame (22) through a rotating shaft.

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