Automatic feeding mechanism of oil press

Abstract

The utility model discloses an automatic feeding mechanism of an oil press. The automatic feeding mechanism comprises a mounting frame, a feeding assembly and a dredging assembly. A storage box is arranged in the middle of the upper end of the mounting frame, a mounting plate is arranged on the upper side in the storage box, a protective cover is arranged in the middle of the upper end of the mounting plate, a discharging pipe is arranged in a discharging opening formed in the middle of the lower end of the storage box, and an adjusting rod is rotationally connected to the middle of the right wall of the protective cover through a bearing; the feeding assembly comprises a feeding pipe, a discharging pipe, an output rod and a spiral piece, and a connecting opening formed in the lower side of the outer arc face of the feeding pipe communicates with a conveying opening formed in the lower end of the discharging pipe. The discharging pipe is prevented from being blocked, and the feeding efficiency is improved while the storage space in the automatic feeding mechanism of the oil press is not occupied.

Description

Technical Field

[0001] The utility model relates to the technical field of feeding equipment, in particular to an automatic feeding mechanism of an oil press. Background Technique

[0002] An oil press is a kind of oil processing machinery that can produce peanut oil, walnut oil and sesame oil. It is a machine that extracts vegetable oil from pretreated oil seeds by extrusion. When the oil press is running, the processed oil seeds enter the pressing chamber from the hopper, and the screw rotates to continuously push the oil seeds inward for pressing work.

[0003] During the use of the existing oil press, usually, the staff pours the oil seeds into the interior of the automatic feeding mechanism of the oil press, and then the oil seeds enter the interior of the feeding pipe through the feeding pipe. At this time, the automatic feeding mechanism of the oil press drives the spiral blade to rotate through the driving device, so as to drive the oil seeds inside the feeding pipe to move upward through the spiral blade. When the oil seeds move to the upper side inside the feeding pipe, the oil seeds are discharged through the discharge pipe and finally fall into the hopper arranged at the upper end of the oil press, and then the oil press can carry out the oil pressing work on the oil seeds.

[0004] During the feeding process of the automatic feeding mechanism of the existing oil press, since some oil seeds are relatively wet and easy to agglomerate and block the feeding pipe, the feeding efficiency is affected. Some automatic feeding mechanisms of oil presses are provided with multiple groups of driving devices to drive the stirring rods to rotate in multiple directions at the same time. Although the agglomerated oil seeds can be crushed, the structure inside the automatic feeding mechanism of the oil press becomes more complex, reducing the storage space inside the automatic feeding mechanism of the oil press, so frequent feeding work is required. For this reason, we propose an automatic feeding mechanism of an oil press. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide an automatic feeding mechanism of an oil press. Through the cooperative setting of bevel gears and cams, during the feeding work, while the stirring rod crushes the agglomerated oil seeds, the lifting plate can drive the oil seeds to continuously tumble, preventing some oil seeds from depositing inside the storage tank and preventing the feeding pipe from being blocked. Without occupying the storage space inside the automatic feeding mechanism of the oil press, the feeding efficiency is increased, and the problems in the background technique can be effectively solved.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: an automatic feeding mechanism of an oil press, comprising a mounting frame, a feeding assembly and a dredging assembly;

[0007] Mounting frame: A storage box is provided in the middle of its upper end. An installation plate is provided on the upper side inside the storage box. A protective cover is provided in the middle of the upper end of the installation plate. A discharge pipe is provided in the discharge opening opened in the middle of the lower end of the storage box. The middle of the right wall of the protective cover is rotatably connected to an adjusting rod through a bearing;

[0008] Feeding component: It includes a feeding pipe, a discharge pipe, an output rod and a spiral blade. The connection port provided on the lower side of the outer arc surface of the feeding pipe is communicated with the conveying port provided at the lower end of the discharge pipe. A discharge pipe is provided in the discharge port opened on the upper side of the outer arc surface of the feeding pipe. The middle of the bottom wall of the feeding pipe is rotatably connected to an output rod through a bearing. A spiral blade is provided in the middle of the outer arc surface of the output rod;

[0009] Unclogging component: It is provided on the upper end of the installation plate. The unclogging component is located inside the protective cover. Through the cooperation of bevel gears and cams, during the feeding process, the stirring rod can crush the agglomerated oil while driving the oil to continuously churn through the lifting plate, avoiding partial deposition of the oil inside the storage box and preventing the discharge pipe from being blocked. While not occupying the storage space inside the automatic feeding mechanism of the oil press, the feeding efficiency is increased.

[0010] Furthermore, it further includes a control switch group. The control switch group is provided at the right end of the storage box. The input end of the control switch group is electrically connected to an external power supply, and it can control the electrical components inside the equipment.

[0011] Furthermore, the feeding component further includes a driving motor. The driving motor is provided at the lower end of the feeding pipe. The upper end of the output shaft of the driving motor is fixedly connected to the lower end of the output rod. The input end of the driving motor is electrically connected to the output end of the control switch group, and it can drive the spiral blade to rotate through the output rod.

[0012] Furthermore, the unclogging component includes a connecting rod, a rotating cylinder, a vertical rod, a stirring rod, a limiting rod and an installation ring. The connecting rod is rotatably connected to the middle of the upper end of the installation plate through a bearing. The upper end of the connecting rod is located inside the protective cover. The lower end of the connecting rod is provided with a rotating cylinder. Limiting grooves are respectively provided in the middle of the outer arc surface of the rotating cylinder. A vertical rod is slidably connected inside the rotating cylinder. Limiting rods are respectively provided on the upper side of the outer arc surface of the vertical rod. The limiting rods are respectively slidably connected to the vertically adjacent limiting grooves. The outer ends of the limiting rods are fixedly connected to the inner ring surface of the adjusting bearing. The inner arc surface of the installation ring is fixedly connected to the outer ring surface of the adjusting bearing. Stirring rods are evenly provided on the outer arc surface of the vertical rod, and it can crush the agglomerated oil.

[0013] Furthermore, the unclogging component further includes a lifting plate. The lifting plates are respectively provided on the lower side of the outer arc surface of the vertical rod. The lifting plates are arranged at intervals with the stirring rods of the same height, and it can churn the oil to prevent the oil from blocking the discharge pipe.

[0014] Further, it also includes a motor and bevel gears. The motor is arranged in the middle of the left wall of the protective cover. The right end of the output shaft of the motor is fixedly connected to the left end of the adjusting rod. The bevel gears are respectively arranged in the middle of the outer arc surface of the adjusting rod and the upper end of the connecting rod. The two bevel gears are meshed and connected. The input end of the motor is electrically connected to the output end of the control switch group, and can drive the rotating cylinder to rotate through the connecting rod.

[0015] Further, it also includes a sliding column, a fixing plate, a cam and a spring. The sliding column is slidably connected to the sliding hole arranged on the right side of the upper end of the mounting plate. A cross bar is arranged on the lower side of the outer arc surface of the sliding column. The right side of the outer arc surface of the mounting ring is fixedly connected to the left end of the cross bar. The fixing plate is arranged at the upper end of the sliding column. The cam is arranged on the right side of the outer arc surface of the adjusting rod. The outer arc surface of the cam contacts the upper end of the fixing plate. The spring is arranged between the lower end of the fixing plate and the upper end of the mounting plate. The spring is sleeved on the outside of the upper side of the sliding column, and can drive the lifting plate to perform vertical reciprocating motion.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: The automatic feeding mechanism of this oil press has the following advantages:

[0017] During the feeding process, through the regulation of the control switch group, the motor starts to operate. The output shaft of the motor drives the adjusting rod to rotate. The adjusting rod drives the connecting rod to rotate through the meshing connection between the bevel gears. The connecting rod drives the rotating cylinder to rotate. The rotating cylinder drives the vertical rod to rotate through the limiting rod. The central axes of the connecting rod and the vertical rod are the same. The vertical rod drives the stirring rod to rotate synchronously to crush the agglomerated oil materials. During the operation of the motor, the adjusting rod simultaneously drives the cam to rotate. When the contact point between the cam and the fixing plate changes from the center to the far center, the cam drives the sliding column to move downward through the fixing plate, and the spring contracts. The sliding column drives the vertical rod to move downward through the mounting ring. When the contact point between the cam and the fixing plate changes from the far center to the center, the elastic force generated by the extension of the spring drives the sliding column to move upward through the fixing plate. During the upward movement of the sliding column, the sliding column drives the vertical rod to move upward through the mounting ring, so that the stirring rod can drive the oil materials to continuously tumble through the lifting plate while crushing the agglomerated oil materials, avoiding partial deposition of the oil materials inside the storage tank and preventing the feeding pipe from being blocked. Through the combined setting of the bevel gears and the cam, during the feeding process, the stirring rod can drive the oil materials to continuously tumble through the lifting plate while crushing the agglomerated oil materials, avoiding partial deposition of the oil materials inside the storage tank and preventing the feeding pipe from being blocked. While not occupying the internal storage space of the automatic feeding mechanism of the oil press, the feeding efficiency is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the feeding assembly of the present utility model;

[0020] Figure 3 Schematic diagram of the upper side cross-sectional structure of the present utility model;

[0021] Figure 4 Schematic diagram of the enlarged structure at position A of the present utility model.

[0022] In the figure: 1 mounting frame, 2 storage box, 3 control switch group, 4 blanking pipe, 5 feeding assembly, 51 feeding pipe, 52 discharging pipe, 53 output rod, 54 spiral blade, 55 driving motor, 6 mounting plate, 7 dredging assembly, 71 connecting rod, 72 rotating cylinder, 73 vertical rod, 74 stirring rod, 75 lifting plate, 76 limiting rod, 77 mounting ring, 8 protective cover, 9 motor, 10 bevel gear, 11 sliding column, 12 fixing plate, 13 cam, 14 spring, 15 adjusting rod. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Please refer to Figures 1-4 , this embodiment provides a technical solution: an automatic feeding mechanism of an oil press, including a mounting frame 1, a feeding assembly 5 and a dredging assembly 7;

[0025] Mounting frame 1: A storage box 2 is provided in the middle of its upper end. An installation plate 6 is provided on the upper side inside the storage box 2. A protective cover 8 is provided in the middle of the upper end of the installation plate 6. A blanking pipe 4 is provided in the blanking port opened in the middle of the lower end of the storage box 2. The middle of the right wall of the protective cover 8 is rotatably connected to an adjusting rod 15 through a bearing. Before use, the automatic feeding mechanism of the oil press is moved to a designated working location by an external traction device, so that the feeding device is located above the hopper provided at the upper end of the external oil press. Then, the mounting frame 1 is installed and docked with the corresponding work station to realize the support and fixation of the mounting frame 1 and the internal equipment. Then, the staff pours the oil material into the storage box 2. The oil material enters the internal part of the feeding device through the blanking pipe 4. Then, the oil material is injected into the feeding hopper through the feeding device. Finally, the external oil press performs oil pressing work on the oil material. During the feeding work, the caked oil material can be crushed by the dredging device to prevent the blanking pipe 4 from being blocked;

[0026] Feeding component 5: It includes a feeding pipe 51, a discharging pipe 52, an output rod 53 and a spiral blade 54. The connection port provided on the lower side of the outer arc surface of the feeding pipe 51 is communicated with the conveying port provided at the lower end of the discharging pipe 4. A discharging pipe 52 is arranged in the discharging port opened on the upper side of the outer arc surface of the feeding pipe 51. The middle of the bottom wall of the feeding pipe 51 is rotatably connected with an output rod 53 through a bearing. A spiral blade 54 is arranged in the middle of the outer arc surface of the output rod 53. The feeding component 5 further includes a driving motor 55. The driving motor 55 is arranged at the lower end of the feeding pipe 51. The upper end of the output shaft of the driving motor 55 is fixedly connected with the lower end of the output rod 53. The input end of the driving motor 55 is electrically connected with the output end of the control switch group 3. After being regulated by the control device, the driving motor 55 starts to operate. The output shaft of the driving motor 55 drives the output rod 53 to rotate. The output rod 53 drives the spiral blade 54 to rotate. Thus, the oil in the feeding pipe 51 is driven to move upward by the spiral rod 54. When the oil moves to the upper side inside the feeding pipe 51, the oil is discharged through the discharging pipe 52 and then falls into the inside of the feed hopper. Then, the oil is pressed by an external oil press;

[0027] Unclogging component 7: It is arranged at the upper end of the mounting plate 6. The unclogging component 7 is located inside the protective cover 8. The unclogging component 7 includes a connecting rod 71, a rotating cylinder 72, a vertical rod 73, a stirring rod 74, a limiting rod 76 and a mounting ring 77. The connecting rod 71 is rotatably connected to the middle of the upper end of the mounting plate 6 through a bearing. The upper end of the connecting rod 71 is located inside the protective cover 8. The lower end of the connecting rod 71 is provided with a rotating cylinder 72. Limiting grooves are respectively arranged in the middle of the outer arc surface of the rotating cylinder 72. A vertical rod 73 is slidably connected inside the rotating cylinder 72. Limiting rods 76 are respectively arranged on the upper side of the outer arc surface of the vertical rod 73. The limiting rods 76 are respectively slidably connected with the vertically adjacent limiting grooves. The outer ends of the limiting rods 76 are fixedly connected with the inner ring surface of the adjusting bearing. The inner arc surface of the mounting ring 77 is fixedly connected with the outer ring surface of the adjusting bearing. Stirring rods 74 are evenly arranged on the outer arc surface of the vertical rod 73. The unclogging component 7 further includes a lifting plate 75. The lifting plates 75 are respectively arranged on the lower side of the outer arc surface of the vertical rod 73. The lifting plates 75 are arranged at intervals with the stirring rods 74 in the same group at the same height. During the feeding process, through the regulation of the control device, the driving device starts to operate. The driving device drives the connecting rod 71 to rotate. The connecting rod 71 drives the rotating cylinder 72 to rotate. The rotating cylinder 72 drives the vertical rod 73 to rotate through the limiting rod 76. The central axes of the connecting rod 71 and the vertical rod 73 are the same. The vertical rod 73 drives the stirring rods 74 to rotate synchronously to crush the agglomerated oil. At the same time, the driving device drives the vertical rod 73 to perform a vertical reciprocating motion through the mounting ring 77, so that the stirring rods 74 can drive the oil to continuously churn through the lifting plates 75 while crushing the agglomerated oil, avoiding partial deposition of the oil inside the storage tank 2 and preventing the discharging pipe 4 from being blocked, increasing the feeding efficiency while not occupying the storage space inside the automatic feeding mechanism of the oil press.

[0028] Among them: It also includes a control switch group 3. The control switch group 3 is arranged at the right end of the storage tank 2. The input end of the control switch group 3 is electrically connected to an external power supply, and it can regulate the electrical components inside the equipment.

[0029] Among them: It also includes a motor 9 and bevel gears 10. The motor 9 is arranged in the middle of the left wall of the protective cover 8. The right end of the output shaft of the motor 9 is fixedly connected to the left end of the adjusting rod 15. The bevel gears 10 are respectively arranged in the middle of the outer arc surface of the adjusting rod 15 and the upper end of the connecting rod 71. The two bevel gears 10 are meshed and connected. The input end of the motor 9 is electrically connected to the output end of the control switch group 3. During the feeding process, through the regulation of the control switch group 3, the motor 9 starts to operate. The output shaft of the motor 9 drives the adjusting rod 15 to rotate. The adjusting rod 15 drives the connecting rod 71 to rotate through the meshing connection between the bevel gears 10. The connecting rod 71 drives the rotating cylinder 72 to rotate. The rotating cylinder 72 drives the vertical rod 73 to rotate through the limiting rod 76. The central axes of the connecting rod 71 and the vertical rod 73 are the same. The vertical rod 73 drives the stirring rod 74 to rotate synchronously to crush the agglomerated oil materials.

[0030] Among them: It also includes a sliding column 11, a fixing plate 12, a cam 13 and a spring 14. The sliding column 11 is slidably connected to a sliding hole arranged on the right side of the upper end of the mounting plate 6. A cross bar is arranged on the lower side of the outer arc surface of the sliding column 11. The right side of the outer arc surface of the mounting ring 77 is fixedly connected to the left end of the cross bar. The fixing plate 12 is arranged at the upper end of the sliding column 11. The cam 13 is arranged on the right side of the outer arc surface of the adjusting rod 15. The outer arc surface of the cam 13 contacts the upper end of the fixing plate 12. The spring 14 is arranged between the lower end of the fixing plate 12 and the upper end of the mounting plate 6. The spring 14 is sleeved on the outside of the upper side of the sliding column 11. During the operation of the motor 9, the adjusting rod 15 simultaneously drives the cam 13 to rotate. When the contact point between the cam 13 and the fixing plate 12 changes from the center to the far center, the cam 13 drives the sliding column 11 to move downward through the fixing plate 12, and the spring 14 contracts. The sliding column 11 drives the vertical rod 73 to move downward through the mounting ring 77. When the contact point between the cam 13 and the fixing plate 12 changes from the far center to the center, the elastic force generated by the extension of the spring 14 drives the sliding column 11 to move upward through the fixing plate 12. During the upward movement of the sliding column 11, it drives the vertical rod 73 to move upward through the mounting ring 77, so that the stirring rod 74 can drive the oil materials to continuously tumble through the lifting plate 75 while crushing the agglomerated oil materials.

[0031] The working principle of an automatic feeding mechanism of an oil press provided by the present utility model is as follows: Before use, the automatic feeding mechanism of the oil press is moved to a designated working location through an external traction device, so that the discharge pipe 52 is located above the hopper arranged at the upper end of the external oil press. Then, the mounting frame 1 is installed and docked with the corresponding working station, so as to realize the support and fixation of the mounting frame 1 and the internal equipment. Then, the staff pours the oil material into the storage tank 2. The oil material enters the interior of the feeding pipe 51 through the feeding pipe 4. Then, through the regulation of the control switch group 3, the driving motor 55 starts to operate. The output shaft of the driving motor 55 drives the output rod 53 to rotate, and the output rod 53 drives the spiral blade 54 to rotate. Thus, the oil material inside the feeding pipe 51 is driven to move upward by the spiral rod 54. When the oil material moves to the upper side inside the feeding pipe 51, the oil material is discharged through the discharge pipe 52 and then falls into the interior of the feed hopper. Then, the external oil press performs the oil pressing work on the oil material. During the feeding process, through the regulation of the control switch group 3, the motor 9 starts to operate. The output shaft of the motor 9 drives the adjusting rod 15 to rotate. The adjusting rod 15 drives the connecting rod 71 to rotate through the meshing connection between the bevel gears 10. The connecting rod 71 drives the rotating cylinder 72 to rotate. The rotating cylinder 72 drives the vertical rod 73 to rotate through the limiting rod 76. The central axes of the connecting rod 71 and the vertical rod 73 are the same. The vertical rod 73 drives the stirring rod 74 to rotate synchronously, so as to crush the agglomerated oil material. During the operation of the motor 9, the adjusting rod 15 also drives the cam 13 to rotate. When the contact point between the cam 13 and the fixed plate 12 changes from the center to the far center, the cam 13 drives the sliding column 11 to move downward through the fixed plate 12, and the spring 14 contracts. The sliding column 11 drives the vertical rod 73 to move downward through the mounting ring 77. When the contact point between the cam 13 and the fixed plate 12 changes from the far center to the center, the elastic force generated by the extension of the spring 14 drives the sliding column 11 to move upward through the fixed plate 12. During the upward movement of the sliding column 11, the sliding column 11 drives the vertical rod 73 to move upward through the mounting ring 77, so that the stirring rod 74 can drive the oil material to continuously tumble through the lifting plate 75 while crushing the agglomerated oil material, avoiding partial deposition of the oil material inside the storage tank 2 and preventing blockage of the feeding pipe 4.

[0032] It should be noted that the motor 9 and the driving motor 55 disclosed in the above embodiments can be selected as 5IK200A - AF, and control buttons corresponding to the motor 9 and the driving motor 55 for controlling their switches are arranged on the control switch group 3.

[0033] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present utility model.

Claims

1. An automatic feeding mechanism for an oil press, characterized in that: It includes a mounting frame (1), a feeding component (5) and a dredging component (7); Mounting frame (1): In the middle of its upper end, there is a storage box (2). On the upper side inside the storage box (2), there is a mounting plate (6). In the middle of the upper end of the mounting plate (6), there is a protective cover (8). Inside the material discharge port opened in the middle of the lower end of the storage box (2), there is a material discharge pipe (4). The middle of the right wall of the protective cover (8) is rotatably connected to an adjusting rod (15) through a bearing; Feeding component (5): It includes a feeding pipe (51), a discharge pipe (52), an output rod (53) and a spiral blade (54). The connection port provided on the lower side of the outer arc surface of the feeding pipe (51) communicates with the conveying port provided at the lower end of the material discharge pipe (4). Inside the discharge port opened on the upper side of the outer arc surface of the feeding pipe (51), there is a discharge pipe (52). The middle of the bottom wall of the feeding pipe (51) is rotatably connected to an output rod (53) through a bearing. In the middle of the outer arc surface of the output rod (53), there is a spiral blade (54); Dredging component (7): It is arranged on the upper end of the mounting plate (6), and the dredging component (7) is located inside the protective cover (8).

2. The automatic feeding mechanism of an oil press according to claim 1, characterized in that: It also includes a control switch group (3). The control switch group (3) is arranged at the right end of the storage box (2), and the input end of the control switch group (3) is electrically connected to an external power supply.

3. The automatic feeding mechanism of an oil press according to claim 2, characterized in that: The feeding component (5) further includes a driving motor (55). The driving motor (55) is arranged at the lower end of the feeding pipe (51). The upper end of the output shaft of the driving motor (55) is fixedly connected to the lower end of the output rod (53). The input end of the driving motor (55) is electrically connected to the output end of the control switch group (3).

4. The automatic feeding mechanism of an oil press according to claim 2, characterized in that: The dredging component (7) includes a connecting rod (71), a rotating cylinder (72), a vertical rod (73), a stirring rod (74), a limiting rod (76) and a mounting ring (77). The connecting rod (71) is rotatably connected to the middle of the upper end of the mounting plate (6) through a bearing. The upper end of the connecting rod (71) is located inside the protective cover (8). The lower end of the connecting rod (71) is provided with a rotating cylinder (72). Limiting grooves are respectively arranged in the middle of the outer arc surface of the rotating cylinder (72). A vertical rod (73) is slidably connected inside the rotating cylinder (72). Limiting rods (76) are respectively arranged on the upper side of the outer arc surface of the vertical rod (73). The limiting rods (76) are respectively slidably connected to the vertically adjacent limiting grooves. The outer ends of the limiting rods (76) are fixedly connected to the inner ring surface of an adjusting bearing. The inner arc surface of the mounting ring (77) is fixedly connected to the outer ring surface of the adjusting bearing. Stirring rods (74) are evenly arranged on the outer arc surface of the vertical rod (73).

5. The automatic feeding mechanism of an oil press according to claim 4, characterized in that: The dredging component (7) further includes a lifting plate (75). The lifting plates (75) are respectively arranged on the lower side of the outer arc surface of the vertical rod (73). The lifting plates (75) are arranged at intervals with the stirring rods (74) of the same height as a group.

6. The automatic feeding mechanism of an oil press according to claim 4, characterized in that: It further includes a motor (9) and bevel gears (10). The motor (9) is arranged in the middle of the left wall of the protective cover (8). The right end of the output shaft of the motor (9) is fixedly connected to the left end of the adjusting rod (15). The bevel gears (10) are respectively arranged in the middle of the outer arc surface of the adjusting rod (15) and the upper end of the connecting rod (71). The two bevel gears (10) are meshed and connected. The input end of the motor (9) is electrically connected to the output end of the control switch group (3).

7. The automatic feeding mechanism of an oil press according to claim 4, characterized in that: It further includes a sliding column (11), a fixing plate (12), a cam (13) and a spring (14). The sliding column (11) is slidably connected to a sliding hole arranged on the right side of the upper end of the mounting plate (6). A cross bar is arranged on the lower side of the outer arc surface of the sliding column (11). The right side of the outer arc surface of the mounting ring (77) is fixedly connected to the left end of the cross bar. The fixing plate (12) is arranged at the upper end of the sliding column (11). The cam (13) is arranged on the right side of the outer arc surface of the adjusting rod (15). The outer arc surface of the cam (13) contacts the upper end of the fixing plate (12). The spring (14) is arranged between the lower end of the fixing plate (12) and the upper end of the mounting plate (6). The spring (14) is sleeved on the outside of the upper side of the sliding column (11).

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