Screening type feeding device

Abstract

The invention belongs to the technical field of feeding devices, and discloses a screening type feeding device which comprises a device body, a feeding port is formed in the top end of the device body, a discharging port is formed in one side of the bottom end of the device body, and a screening assembly and a negative pressure assembly are arranged in the device body. Firstly, the motor and the negative pressure fan are started, then raw materials are fed into the device body from the feeding port, the raw materials fall at the top end of the screen, powder flying in the raw material feeding process and the screening process is sucked in from the material suction pipe, guided into the material guide groove through the connecting pipe and the negative pressure pipe and finally discharged into the device body again to be mixed with the screened raw materials, and the raw materials are screened. According to the feeding and screening device for the bread, flying powder is sucked in, dust generated in the raw material adding and screening process can be reduced, the cleanliness of the working environment is improved, the health of surrounding workers is guaranteed, and the quality of the bread and the food safety are indirectly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of feeding devices, in particular to a screening type feeding device. Background Art

[0002] The screening feeding device is mainly used for screening and feeding of materials. The screening feeding device is generally composed of a screening structure, a conveying structure and a driving mechanism. After the materials enter the device, they are separated by the screening action of the screen, and finally the screened materials are sent to the next process through the conveying structure. The sieving feeding device has a wide range of applications. When used in the preparation of soft bread, it can effectively control the mixing ratio of flour and other ingredients, ensuring the uniformity and quality of the dough. In addition, the device has a high degree of automation, which reduces the error of manual operation and improves production efficiency. In the process of preparing soft bread, the use of the sieving feeding device not only improves the standardization of the product, but also reduces the production cost. It is an indispensable part of the modern bread production line. In the process of making soft bread, the raw materials that usually need to be screened include various powders (such as flour, baking powder, fermentation powder, etc.). These powders are small in size and light in weight, and are easily carried away by the air when they are put in, thus causing the deterioration of the production environment. This not only makes the working area messy, affecting the cleanliness and comfort of the production environment, but is also easily inhaled by nearby workers, posing a threat to health. Summary of the invention

[0003] The object of the present invention is to provide a screening feeding device to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a screening feeding device, comprising a device body, a feeding port is provided at the top of the device body, a discharge port is provided at one side of the bottom of the device body, and a screening component and a negative pressure component are arranged inside the device body; The screening assembly comprises a screen disposed inside the device body, a first cam and a first spring are disposed on both sides of the screen, a first rotating shaft is fixedly installed inside the first cam, and a motor is connected to the bottom end of the first rotating shaft; The negative pressure component includes a connecting pipe arranged inside the device body, the inner walls on the four sides of the connecting pipe are evenly connected with suction pipes, the suction pipe is arranged above the screen, the bottom end of the connecting pipe is fixedly connected with a negative pressure pipe, the negative pressure pipe is installed at one end of the negative pressure fan, the negative pressure fan is fixedly installed on the side wall of the device body, the bottom end of the negative pressure pipe is provided with a material guide groove, and the material guide groove is opened inside the device body.

[0005] As a further technical solution of the present invention, one end of each of the suction pipes is fixedly connected to a filter screen, and a knocking component is provided on one side of the filter screen.

[0006] As a further technical solution of the present invention, the material guide trough is arranged at an angle.

[0007] As a further technical solution of the present invention, a material baffle plate is fixedly installed inside the material guide trough, and the material baffle plate is arranged on one side of the bottom end of the negative pressure tube.

[0008] As a further technical solution of the present invention, a blocking block is embedded in the bottom end of the material guide trough, a first connecting rod is fixedly installed on one side of the blocking block, a movable plate is fixedly connected to the top end of the first connecting rod, a limiting rod is slidably installed inside the movable plate, and the limiting rod is fixedly installed inside the device body.

[0009] As a further technical solution of the present invention, a second spring is arranged on the outer wall of the limiting rod, and the second spring is arranged on one side of the moving plate.

[0010] As a further technical solution of the present invention, the knocking assembly includes a knocking plate arranged on one side of the filter, the knocking plate is fixedly connected to a second connecting rod on the side away from the filter, the second connecting rod is slidably installed inside the suction pipe, the end of the second connecting rod away from the suction pipe is connected to a connecting plate through a rotating assembly, the connecting plate is slidably installed inside the device body, a third spring is installed between the connecting plate and the device body, four connecting plates are provided, and the four connecting plates are distributed in a rectangular shape, a second cam is provided on one side of one of the connecting plates, a second rotating shaft is fixedly installed inside the second cam, the second rotating shaft is provided on one side of the first rotating shaft, and the second rotating shaft is connected to the first rotating shaft through a pulley group.

[0011] As a further technical solution of the present invention, a wedge block is fixedly installed at the end of the connecting plate.

[0012] As a further technical solution of the present invention, knocking blocks are evenly arranged inside the knocking plate, the knocking blocks are slidably connected to the knocking plate, and a fourth spring is installed between the knocking blocks and the knocking plate.

[0013] As a further technical solution of the present invention, the rotating assembly includes a limiting shaft slidably mounted on the outer wall of the second connecting rod, one end of the limiting shaft is fixedly mounted on the side wall of the connecting plate, a sliding groove is opened inside the limiting shaft, a sliding block is slidably connected inside the sliding groove, and the sliding block is fixedly mounted on the outer wall of the second connecting rod.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention is configured by cooperating with a screening component and a negative pressure component. When the soft bread needs to be screened and fed, the motor and the negative pressure fan are first started, and then the raw materials are put into the device body from the feed port so that the raw materials fall on the top of the screen. When the motor is started, the first rotating shaft is driven to rotate, and the rotation of the first rotating shaft drives the rotation of the first cam. When the convex end of the first cam contacts the screen, the screen is driven to move to one side, and at the same time, the first spring is deformed by force to store elastic potential energy. When the convex end of the first cam moves away from one side of the screen, the elastic potential energy is released by the first spring to make the screen move and reset, and the first cam continuously rotates with the screen. The first spring cooperates to make the screen move back and forth to screen the raw materials. When the negative pressure fan is started, negative pressure is generated, and it is connected to the suction pipe through a connecting pipe. The flying powder when the raw materials are added and during the screening process is sucked in from the suction pipe, and guided to the inside of the material guide trough through the connecting pipe and the negative pressure pipe, and finally discharged into the main body of the device, mixed with the screened raw materials, and finally discharged from the discharge port to the next process. By sucking in the flying powder, the dust generated during the raw material addition and screening process can be reduced, which not only improves the cleanliness of the working environment and protects the health of surrounding workers, but also indirectly improves the quality of bread and food safety.

[0015] 2. The present invention arranges a knocking assembly. When screening raw materials, the rotation of the first rotating shaft drives the rotation of the second rotating shaft through the pulley group. The rotation of the second rotating shaft drives the rotation of the second cam, so that the second cam drives the connecting plate to move, and the connecting plate is reciprocated by the elastic cooperation of the third spring. The movement of the connecting plate drives the second connecting rod to slide inside the suction pipe. The movement of the second connecting rod drives the movement of the knocking plate, so that the knocking plate reciprocates and knocks on the side wall of the filter, which helps to discharge the powder attached to the side wall or the inside of the filter. It can not only improve the collection rate of the powder, but also ensure the negative pressure effect.

[0016] 3. The present invention is arranged through a rotating component. When tapping, the movement of the connecting plate drives the movement of the limiting shaft. When the side wall of the limiting shaft contacts the slider, the slider is driven to slide inside the slide groove, so that the second connecting rod rotates, thereby driving the tapping plate to rotate a certain angle, so that the tapping plate changes its angle each time it taps the filter, thereby increasing the tapping area and the tapping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 It is a schematic cross-sectional view of the structure of the main body of the device of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle; Figure 5For the present invention Figure 3 A magnified schematic diagram of the structure at B in the middle; Figure 6 This is a schematic diagram of the structure of the connecting plate of the present invention; Figure 7 This is a schematic diagram of the structure of the limit axis of the present invention; Figure 8 It is a schematic cross-sectional view of the structure of the limit axis of the present invention; Fig. 9 It is a schematic diagram of the structure of the blockage of the present invention.

[0018] In the figure: 1. device body; 2. feed inlet; 3. discharge outlet; 4. screen; 5. first cam; 6. first rotating shaft; 7. motor; 8. first spring; 9. suction pipe; 10. connecting pipe; 11. negative pressure pipe; 12. negative pressure fan; 13. material guide trough; 14. filter; 15. material baffle plate; 16. blocking block; 17. first connecting rod; 18. moving plate; 19. limiting rod; 20. second spring; 21. second connecting rod; 22. knocking plate; 23. connecting plate; 24. third spring; 25. second cam; 26. second rotating shaft; 27. pulley group; 28. limiting shaft; 29. ​​slide groove; 30. slider; 31. wedge block; 32. knocking block; 33. fourth spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 9 As shown, in an embodiment of the present invention, a screening type feeding device comprises a device body 1, a feeding port 2 is provided at the top of the device body 1, a discharge port 3 is provided at one side of the bottom of the device body 1, and a screening component and a negative pressure component are arranged inside the device body 1; The screening assembly includes a screen 4 arranged inside the device body 1, a first cam 5 and a first spring 8 are arranged on both sides of the screen 4, a first rotating shaft 6 is fixedly installed inside the first cam 5, and a motor 7 is connected to the bottom end of the first rotating shaft 6; The negative pressure component includes a connecting pipe 10 arranged inside the device body 1, and the inner walls on the four sides of the connecting pipe 10 are evenly connected with the suction pipe 9, and the suction pipe 9 is arranged above the screen 4. The bottom end of the connecting pipe 10 is fixedly connected with a negative pressure pipe 11, and the negative pressure pipe 11 is installed at one end of the negative pressure fan 12. The negative pressure fan 12 is fixedly installed on the side wall of the device body 1, and the bottom end of the negative pressure pipe 11 is provided with a material guide groove 13, and the material guide groove 13 is opened inside the device body 1.

[0021] The air inlet end of the negative pressure pipe 11 is connected to the connecting pipe 10, and the air outlet end of the negative pressure pipe 11 is connected to the material guide trough 13; By cooperating with the screening component and the negative pressure component, when the soft bread needs to be screened, the motor 7 and the negative pressure fan 12 are first started, and then the raw materials are put into the device body 1 from the feed inlet 2, so that the raw materials fall on the top of the screen 4; When the motor 7 is started, the first rotating shaft 6 is driven to rotate, and the rotation of the first rotating shaft 6 drives the rotation of the first cam 5. When the convex end of the first cam 5 contacts the screen 4, the screen 4 is driven to move to one side, and at the same time, the first spring 8 is deformed by force to store elastic potential energy. When the convex end of the first cam 5 moves away from one side of the screen 4, the elastic potential energy is released by the first spring 8 to move the screen 4 to reset. The first cam 5 continuously rotates and cooperates with the first spring 8 to make the screen 4 reciprocate to screen the raw materials. When the negative pressure fan 12 is started, negative pressure is generated, and it is connected to the suction pipe 9 through the connecting pipe 10, so that the powder flying during the raw material input and the screening process is sucked from the suction pipe 9, and guided to the inside of the guide trough 13 through the connecting pipe 10 and the negative pressure pipe 11, and finally discharged into the device body 1 again, mixed with the screened raw materials, and finally discharged from the discharge port 3 to the next process; By inhaling the flying powder, the dust generated during the raw material addition and screening process can be reduced, which not only improves the cleanliness of the working environment and protects the health of surrounding workers, but also indirectly improves the quality of bread and food safety.

[0022] like Figures 1 to 4 As shown, one end of each suction pipe 9 is fixedly connected to a filter screen 14, and a knocking component is provided on one side of the filter screen 14.

[0023] Prevent large particles of raw materials from being sucked in to ensure that the raw materials can be fully screened.

[0024] like Figure 3 and Figure 5 As shown, the guide chute 13 is arranged tilted.

[0025] When the sucked raw material falls from the negative pressure pipe 11 into the material guide trough 13, it is obliquely guided into the device body 1 through the material guide trough 13 to be mixed with the screened raw material, thereby reducing the waste of raw materials as much as possible.

[0026] like Figure 5 As shown, a material baffle plate 15 is fixedly installed inside the material guide trough 13 , and the material baffle plate 15 is arranged on one side of the bottom end of the negative pressure tube 11 .

[0027] The top end of the material guide groove 13 faces the outside of the device body 1, and the bottom end of the material guide groove 13 faces the inside of the device body 1; When the sucked raw material enters the material guide groove 13, the gas flows upward and is discharged from the top of the material guide groove 13, and the powder is discharged downward into the device body 1; The inhaled raw materials are buffered by the baffle plate 15 to prevent the raw materials from entering the device body 1 and impacting the screened raw materials in the device body 1 due to air pressure.

[0028] like Figure 3 and Figure 5 As shown, a blocking block 16 is embedded at the bottom end of the material guide trough 13, a first connecting rod 17 is fixedly installed on one side of the blocking block 16, a movable plate 18 is fixedly connected to the top end of the first connecting rod 17, a limiting rod 19 is slidably installed inside the movable plate 18, and the limiting rod 19 is fixedly installed inside the device body 1.

[0029] The blocking block 16 is located at the bottom end of the material guide trough 13 . When the material is not discharged, the end of the material guide trough 13 is blocked by the blocking block 16 to prevent the raw materials in the device body 1 from entering the interior of the material guide trough 13 .

[0030] like Figure 5 and Fig. 9 As shown, a second spring 20 is disposed on an outer wall of the limiting rod 19 , and the second spring 20 is disposed on one side of the moving plate 18 .

[0031] When the raw material is sucked into the guide groove 13 by negative pressure, the block 16 is pushed open by the gravity of the powder, so that the powder inside the guide groove 13 is discharged; When the blocking block 16 moves, the first connecting rod 17 drives the movable plate 18 to slide on the outer wall of the limiting rod 19, and at the same time causes the second spring 20 to deform to store elastic potential energy. After the discharge is completed, the elastic potential energy is released by the second spring 20 to move the movable plate 18 to reset, so that the blocking block 16 blocks the bottom end of the material guide groove 13.

[0032] like Figures 1 to 8As shown, the knocking assembly includes a knocking plate 22 arranged on one side of the filter 14, and the knocking plate 22 is fixedly connected to a second connecting rod 21 on the side away from the filter 14, and the second connecting rod 21 is slidably installed inside the suction pipe 9. The end of the second connecting rod 21 away from the suction pipe 9 is connected to a connecting plate 23 through a rotating assembly, and the connecting plate 23 is slidably installed inside the device body 1. A third spring 24 is installed between the connecting plate 23 and the device body 1. Four connecting plates 23 are provided, and the four connecting plates 23 are distributed in a rectangular shape. A second cam 25 is provided on one side of one of the connecting plates 23, and a second rotating shaft 26 is fixedly installed inside the second cam 25. The second rotating shaft 26 is provided on one side of the first rotating shaft 6, and the second rotating shaft 26 is connected to the first rotating shaft 6 through a pulley set 27.

[0033] When screening the raw materials, the rotation of the first rotating shaft 6 drives the rotation of the second rotating shaft 26 through the pulley group 27, and the rotation of the second rotating shaft 26 drives the rotation of the second cam 25, so that the second cam 25 drives the connecting plate 23 to move, and the elastic cooperation of the third spring 24 makes the connecting plate 23 move back and forth, and the movement of the connecting plate 23 drives the second connecting rod 21 to slide inside the suction pipe 9, and the movement of the second connecting rod 21 drives the movement of the knocking plate 22, so that the knocking plate 22 reciprocates and knocks on the side wall of the filter screen 14, which helps to discharge the powder attached to the side wall or inside of the filter screen 14, which can not only improve the collection rate of the powder, but also ensure the negative pressure effect.

[0034] like Figure 2 , Figure 3 and Figure 6 As shown, a wedge block 31 is fixedly mounted on the end of the connecting plate 23 .

[0035] When one of the connecting plates 23 moves through the rotation of the second cam 25, the movement of the connecting plate 23 drives the movement of the wedge block 31. The inclined surface of the wedge block 31 contacts the two adjacent connecting plates 23 and drives them to move. The wedge block 31 at one end of the two adjacent connecting plates 23 drives the other connecting plate 23 to move, so that the four connecting plates 23 move synchronously, so that the side walls of the filter screen 14 on all sides can be tapped to ensure the comprehensiveness of the tapping.

[0036] like Figure 7 and Figure 8 As shown, the knocking blocks 32 are evenly arranged inside the knocking plate 22, the knocking blocks 32 are slidably connected to the knocking plate 22, and a fourth spring 33 is installed between the knocking blocks 32 and the knocking plate 22.

[0037] When the knocking plate 22 knocks the side wall of the filter 14, the movement of the knocking plate 22 drives the movement of the knocking block 32. When the end of the knocking block 32 contacts the side wall of the filter 14, the elasticity of the fourth spring 33 produces a certain buffering effect thereon, thereby reducing the impact on the filter 14 and thus increasing its service life.

[0038] like Figure 7 and Figure 8 As shown, the rotating assembly includes a limit shaft 28 slidably mounted on the outer wall of the second connecting rod 21, one end of the limit shaft 28 is fixedly mounted on the side wall of the connecting plate 23, a slide groove 29 is opened inside the limit shaft 28, and a slider 30 is slidably connected inside the slide groove 29, and the slider 30 is fixedly mounted on the outer wall of the second connecting rod 21.

[0039] In order to reduce the negative pressure effect of the knocking plate 22 on the suction pipe 9 as much as possible, the knocking plate 22 is set to be narrower; When tapping, the movement of the connecting plate 23 drives the movement of the limiting shaft 28. When the side wall of the limiting shaft 28 contacts the slider 30, the slider 30 is driven to slide inside the slide groove 29, so that the second connecting rod 21 rotates, thereby driving the tapping plate 22 to rotate a certain angle, so that the tapping plate 22 changes its angle each time it taps the filter 14, thereby increasing the tapping area and the tapping effect.

[0040] Working principle and usage process: When the soft bread needs to be screened, the motor 7 and the negative pressure fan 12 are first started, and then the raw materials are put into the device body 1 from the feed inlet 2 so that the raw materials fall on the top of the screen 4; When the motor 7 is started, the first rotating shaft 6 is driven to rotate, and the rotation of the first rotating shaft 6 drives the rotation of the first cam 5. When the convex end of the first cam 5 contacts the screen 4, the screen 4 is driven to move to one side, and at the same time, the first spring 8 is deformed by force to store elastic potential energy. When the convex end of the first cam 5 moves away from one side of the screen 4, the elastic potential energy is released by the first spring 8 to move the screen 4 to reset. The first cam 5 continuously rotates and cooperates with the first spring 8 to make the screen 4 reciprocate to screen the raw materials. The rotation of the first rotating shaft 6 drives the rotation of the second rotating shaft 26 through the belt pulley set 27, and the rotation of the second rotating shaft 26 drives the rotation of the second cam 25, so that the second cam 25 drives the connecting plate 23 to move, and the elastic cooperation of the third spring 24 causes the connecting plate 23 to reciprocate, and the movement of the connecting plate 23 drives the second connecting rod 21 to slide inside the suction pipe 9, and the movement of the second connecting rod 21 drives the movement of the knocking plate 22, so that the knocking plate 22 reciprocates and knocks on the side wall of the filter screen 14; The movement of the connecting plate 23 drives the movement of the limiting shaft 28. When the side wall of the limiting shaft 28 contacts the slider 30, the slider 30 is driven to slide inside the slide groove 29, so that the second connecting rod 21 rotates, thereby driving the knocking plate 22 to rotate a certain angle, thereby changing the angle of the knocking plate 22 when repeatedly knocking the filter screen 14. When the negative pressure fan 12 is started, negative pressure is generated, and it is connected to the suction pipe 9 through the connecting pipe 10. The powder flying when the raw materials are put in and during the screening process is sucked from the suction pipe 9, and guided to the inside of the guide trough 13 through the connecting pipe 10 and the negative pressure pipe 11, and the sucked raw materials are buffered by the baffle plate 15, and the blockage 16 is pushed away by the gravity of the powder, so that the powder inside the guide trough 13 is discharged into the device body 1, and finally discharged from the discharge port 3 together with the screened raw materials to the next process.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screening feeding device, comprising a device body (1), characterized in that: A feed inlet (2) is provided at the top of the device body (1), a discharge outlet (3) is provided at one side of the bottom of the device body (1), and a screening component and a negative pressure component are provided inside the device body (1); The screening assembly comprises a screen (4) arranged inside the device body (1), a first cam (5) and a first spring (8) are respectively arranged on both sides of the screen (4), a first rotating shaft (6) is fixedly installed inside the first cam (5), and a motor (7) is connected to the bottom end of the first rotating shaft (6); The negative pressure assembly comprises a connecting pipe (10) arranged inside the device body (1), the inner walls on four sides of the connecting pipe (10) are uniformly connected with a suction pipe (9), the suction pipe (9) is arranged above the screen (4), the bottom end of the connecting pipe (10) is fixedly connected with a negative pressure pipe (11), the negative pressure pipe (11) is installed at one end of a negative pressure fan (12), the negative pressure fan (12) is fixedly installed on the side wall of the device body (1), the bottom end of the negative pressure pipe (11) is provided with a material guide groove (13), the material guide groove (13) is opened inside the device body (1), a block (16) is embedded in the bottom end of the material guide groove (13), a first connecting rod (17) is fixedly installed on one side of the block (16), the top end of the first connecting rod (17) is fixedly connected with a movable plate (18), a limit rod (19) is slidably installed inside the movable plate (18), and the limit rod (19) is fixedly installed inside the device body (1).

2. A screening feeding device according to claim 1, characterized in that: One end of each of the suction pipes (9) is fixedly connected to a filter screen (14), and a knocking component is provided on one side of the filter screen (14).

3. A screening feeding device according to claim 1, characterized in that: The material guide trough (13) is arranged inclined.

4. A screening feeding device according to claim 1, characterized in that: A material baffle plate (15) is fixedly installed inside the material guide trough (13), and the material baffle plate (15) is arranged on one side of the bottom end of the negative pressure tube (11).

5. A screening feeding device according to claim 1, characterized in that: The outer wall of the limiting rod (19) is provided with a second spring (20), and the second spring (20) is arranged on one side of the moving plate (18).

6. A screening feeding device according to claim 2, characterized in that: The knocking assembly comprises a knocking plate (22) arranged on one side of the filter (14); a second connecting rod (21) is fixedly connected to a side of the knocking plate (22) away from the filter (14); the second connecting rod (21) is slidably mounted inside the suction pipe (9); an end of the second connecting rod (21) away from the suction pipe (9) is connected to a connecting plate (23) through a rotating assembly; the connecting plate (23) is slidably mounted inside the device body (1); a third spring (24) is installed between the connecting plate (23) and the device body (1); four connecting plates (23) are provided, and the four connecting plates (23) are distributed in a rectangular shape; a second cam (25) is provided on one side of one of the connecting plates (23); a second rotating shaft (26) is fixedly installed inside the second cam (25); the second rotating shaft (26) is provided on one side of the first rotating shaft (6); the second rotating shaft (26) is connected to the first rotating shaft (6) by a pulley group (27).

7. A screening feeding device according to claim 6, characterized in that: A wedge block (31) is fixedly mounted on the end of the connecting plate (23).

8. A screening feeding device according to claim 6, characterized in that: The knocking plate (22) is evenly provided with knocking blocks (32) inside, the knocking blocks (32) are slidably connected to the knocking plate (22), and a fourth spring (33) is installed between the knocking blocks (32) and the knocking plate (22).

9. A screening feeding device according to claim 6, characterized in that: The rotating assembly comprises a limit shaft (28) slidably mounted on the outer wall of the second connecting rod (21), one end of the limit shaft (28) being fixedly mounted on the side wall of the connecting plate (23), a sliding groove (29) being provided inside the limit shaft (28), a sliding block (30) being slidably connected inside the sliding groove (29), and the sliding block (30) being fixedly mounted on the outer wall of the second connecting rod (21).

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