Flat turning type movable bridge structure

Abstract

The invention is applicable to the technical field of bridge structures, and provides a flat rotating type movable bridge structure which comprises piers, bridge deck structures are arranged at the upper ends of the piers, and rotating mechanisms are mounted between the bridge deck structures and the piers and used for driving the bridge deck structures to rotate on the piers. The bridge deck structure comprises a body, the body is arranged at the upper end of the bridge pier, drainage grooves communicating with the cavity are formed in the two ends of the cavity, the other ends of the drainage grooves communicate with the outside, a plurality of water permeable grooves distributed at equal intervals are formed in the top of the body, the lower ends of the water permeable grooves communicate with the cavity, and the water permeable grooves are filled with water filtering materials which are fixedly connected to the body. A plurality of reinforcing structures distributed at equal intervals are arranged in the cavity, a plurality of permeable grooves distributed at equal intervals are formed in the top of a main body of the bridge floor structure, rainwater enters the cavity through the permeable grooves and then is discharged to the outside through the drainage grooves, and the bridge floor drainage function is achieved. The water filtering material is filled in the water permeable tank, so that impurities in the rainwater can be filtered, and a drainage channel is prevented from being blocked.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge structures, and particularly relates to a horizontally rotating opening bridge structure. Background Art

[0002] A horizontally rotating opening bridge is a bridge whose bridge span structure can rotate around a vertical axis. It has relatively large circular bridge piers in a river channel. The rotation centers of the bridge span structure support are of two types: a central point and a circular ring. When opening, the bridge span is a double cantilever beam, and when closed, it is a continuous beam. If the lengths of the two cantilevers are not equal, a counterweight needs to be added to the short cantilever. It drives the bridge body to rotate through an electric motor or hydraulic equipment, and rotates 90 degrees horizontally to allow ships to pass through.

[0003] The existing horizontally rotating opening bridge has poor water permeability on the bridge deck. Long-term retention of accumulated water will seep into the bridge deck pavement layer, corrode the internal steel bars or steel structures, resulting in concrete cracking and spalling, and reducing the structural durability. In winter at low temperatures, the expansion of the frozen accumulated water may cause local uplift or cracks on the bridge deck, further threatening the structural stability. The accumulated water on the bridge deck forms a water film, significantly reducing the friction between the tire and the road surface, increasing the braking distance of the vehicle, and easily causing traffic accidents such as sideslip and rear-end collision. The reflection of the accumulated water forms glare at night, affecting the driver's line of sight and increasing the risk of collision. Poor water permeability accelerates the aging of the bridge deck pavement layer, and it needs to be repaired or replaced regularly, increasing the maintenance frequency and cost. In rainy weather, the bridge needs to be temporarily closed for drainage or cleaning of accumulated water, affecting traffic operation, and at the same time increasing the emergency management cost. The above situations will all have an adverse impact on the bridge structure. To solve the above problems, it is very necessary to design a horizontally rotating opening bridge structure. Summary of the Invention

[0004] The present invention provides a horizontally rotating opening bridge structure to solve the above problems in the prior art.

[0005] The present invention is implemented as follows. A horizontally rotating opening bridge structure includes a bridge pier, a bridge deck structure is arranged at the upper end of the bridge pier, and a rotating mechanism is installed between the bridge deck structure and the bridge pier. The rotating mechanism is used to drive the bridge deck structure to rotate on the bridge pier.

[0006] The bridge deck structure includes a main body, the main body is arranged at the upper end of the bridge pier, a cavity is opened inside the main body, drainage grooves communicating with the cavity are opened at both ends of the cavity, the other ends of the drainage grooves communicate with the outside, a plurality of equally spaced water-permeable grooves are opened at the top of the main body, the lower ends of the water-permeable grooves all communicate with the cavity, filter water materials are filled in the water-permeable grooves, the filter water materials are fixedly connected to the main body, a plurality of equally spaced reinforcement structures are arranged in the cavity, the reinforcement structure includes reinforcing ribs, the reinforcing ribs are formed by two cross-set and integrally formed rib strips, the ends of the reinforcing ribs are all fixedly connected to the main body, and sector blocks are fixedly installed at both ends of the main body.

[0007] Preferably, protective fences are fixedly installed on both sides of the top of the main body. A connecting bar is arranged between the two protective fences. The connecting bar is located at the upper end of the protective fence, and the end of the connecting bar is fixedly connected to the protective fence.

[0008] Preferably, an anti-rust coating is provided on the surface of the protective fence.

[0009] Preferably, the rotating mechanism includes a connecting shaft. The upper end of the connecting shaft is fixedly installed at the center of the bottom of the main body. The lower end of the connecting shaft is rotatably installed on the bridge pier. A gear ring is sleeved and fixedly installed on the connecting shaft. A plurality of servo motors are fixedly installed on the bridge pier and are distributed in a circumferential array. A driving wheel is fixedly installed at the output shaft end of each servo motor. The driving wheels are meshed with the gear ring, and the plurality of driving wheels are distributed in a circumferential array around the gear ring.

[0010] Preferably, a protective cover is fixedly installed outside the bridge pier. The protective cover is installed outside the plurality of driving wheels, the gear ring and the servo motors.

[0011] Preferably, a limiting mechanism is installed on the bridge pier. The limiting mechanism is connected to the main body and is used to limit the main body.

[0012] Preferably, the limiting mechanism includes two spaced limiting sleeves. The limiting sleeves are fixedly installed at the bottom of the main body. Limiting components are arranged below the limiting sleeves. The limiting component includes a side block. The side block is fixedly installed on the side of the bridge pier. A limiting rod penetrates through and is threadedly connected to the side block. The upper end of the limiting rod can be inserted into the limiting sleeve. A guiding frame is fixedly installed on the limiting rod. The guiding frame is fixedly installed on the side block. A stepping motor is fixedly installed on the guiding frame. A spline sleeve is fixedly installed at the output shaft end of the stepping motor. A movable shaft is spline-connected to the spline sleeve. The upper end of the movable shaft is fixedly connected to the bottom of the limiting rod.

[0013] Preferably, a reflective coating is provided on the outer surface of the limiting sleeve.

[0014] Preferably, an isolation cover is fixedly installed at the bottom of the side block. The isolation cover is installed outside the guiding frame and the stepping motor.

[0015] Preferably, two spaced cams are rotatably installed on the main body. The surface of the cam is made of a flexible material. The upper end of the cam extends outside the main body. The lower end of the cam is set as a horizontal plane. Two spaced connecting shafts are rotatably installed in the main body. The connecting shafts are fixedly connected to the cams. A synchronous belt mechanism is installed between the two connecting shafts. A motor is fixedly installed in the main body. The output shaft of the motor is fixedly connected to the connecting shaft.

[0016] Compared with the related art, the swing - type opening bridge structure provided by the present invention has the following beneficial effects:

[0017] Several equally-spaced water-permeable grooves are opened at the top of the main body of the bridge deck structure. The lower end of the water-permeable groove is communicated with the cavity inside the main body, and both ends of the cavity are communicated with the outside through drainage grooves. When it rains, rainwater enters the cavity through the water-permeable grooves and then is discharged to the outside through the drainage grooves, realizing the drainage function of the bridge deck. The water-permeable grooves are filled with water-filtering materials, which can filter impurities in the rainwater and prevent blockage of the drainage channels. A plurality of equally-spaced reinforcement structures are arranged in the cavity. The reinforcement structures are composed of reinforcing ribs, and the reinforcing ribs are formed by two cross-set and integrally formed rib strips. The ends of the reinforcing ribs are fixedly connected to the main body, enhancing the strength and stability of the bridge deck structure.

[0018] The servo motor is used to drive the driving wheel to mesh with the gear ring for transmission, realizing the smooth rotation of the bridge deck structure. The bridge can be flexibly opened or closed according to actual needs, facilitating the passage of ships. A plurality of servo motors are distributed in a circular array, jointly driving the rotation of the bridge deck structure. The power distribution is uniform, reducing the load of a single motor and improving the stability and reliability of the rotation.

[0019] By inserting the limiting rod into the limiting sleeve, the bridge deck structure can be accurately limited and fixed, ensuring the stability of the bridge in the open or closed state and preventing the bridge deck structure from shaking. The stepping motor is used to drive the movement of the limiting rod, realizing the automatic operation of the limiting mechanism and improving the convenience and efficiency of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the present invention;

[0021] Figure 2 It is an enlarged schematic diagram of a partial structure at the pier of the present invention;

[0022] Figure 3 It is of the present invention Figure 2 The enlarged schematic diagram at position A in;

[0023] Figure 4 It is an enlarged cross-sectional view of the bridge deck structure of the present invention;

[0024] Figure 5 It is of the present invention Figure 4 The enlarged schematic diagram at position B in;

[0025] Figure 6 It is an enlarged schematic structural diagram of the synchronous belt mechanism of the present invention.

[0026] In the figure: pier 1, bridge deck structure 2, main body 3, cavity 4, drainage trough 5, water permeable trough 6, water filtering material 7, reinforcing rib 8, guardrail 9, connecting strip 10, connecting shaft 11, gear ring 12, servo motor 13, driving wheel 14, protective cover 15, limiting sleeve 16, side block 17, limiting rod 18, guiding frame 19, stepping motor 20, spline sleeve 21, movable shaft 22, isolation cover 23, sector block 24, cam 25, connecting shaft 26, synchronous belt mechanism 27, motor 28. Detailed implementation manners

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0028] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0029] The preferred embodiment of the swing - type opening bridge structure provided by the present invention is as Figures 1 to 6 shown:

[0030] A horizontally rotating opening bridge structure includes a pier 1. At the upper end of the pier 1, a bridge deck structure 2 is provided. A rotating mechanism is installed between the bridge deck structure 2 and the pier 1, and the rotating mechanism is used to drive the bridge deck structure 2 to rotate on the pier 1. The bridge deck structure 2 includes a main body 3. The main body 3 is arranged at the upper end of the pier 1. A cavity 4 is formed inside the main body 3. Drainage grooves 5 communicating with the cavity 4 are formed at both ends of the cavity 4. The other ends of the drainage grooves 5 communicate with the outside. A number of equally spaced water permeable grooves 6 are formed at the top of the main body 3. The lower ends of the water permeable grooves 6 are all communicated with the cavity 4. Filtering materials 7 are filled in the water permeable grooves 6. The filtering materials 7 are fixedly connected to the main body 3. A plurality of equally spaced reinforcement structures are arranged in the cavity 4. The reinforcement structure includes a reinforcing rib 8. The reinforcing rib 8 is formed by two cross - arranged and integrally formed ribs. The ends of the reinforcing rib 8 are fixedly connected to the main body 3. Sector blocks 24 are fixedly installed at both ends of the main body 3. Protective fences 9 are fixedly installed on both sides of the top of the main body 3. A connecting strip 10 is arranged between the two protective fences 9. The connecting strip 10 is located at the upper end of the protective fence 9. The ends of the connecting strip 10 are fixedly connected to the protective fence 9. Anti - rust coatings are provided on the surfaces of the protective fences 9.

[0031] The rotating mechanism includes a connecting shaft 11. The upper end of the connecting shaft 11 is fixedly installed at the center of the bottom of the main body 3. The lower end of the connecting shaft 11 is rotatably installed on the pier 1. A gear ring 12 is sleeved and fixedly installed on the connecting shaft 11. A plurality of servo motors 13 arranged in a circular array are fixedly installed on the pier 1. Driving wheels 14 are fixedly installed at the output shaft ends of the servo motors 13. The driving wheels 14 are meshed with the gear ring 12. The plurality of driving wheels 14 are arranged in a circular array around the gear ring 12. A protective cover 15 is fixedly installed outside the pier 1. The protective cover 15 is installed outside the plurality of driving wheels 14, the gear ring 12 and the servo motors 13.

[0032] A limiting mechanism is installed on the pier 1. The limiting mechanism is connected to the main body 3 and is used to limit the main body 3. The limiting mechanism includes two spaced - apart limiting sleeves 16. The limiting sleeves 16 are fixedly installed at the bottom of the main body 3. Limiting components are arranged below the limiting sleeves 16. The limiting component includes a side block 17. The side block 17 is fixedly installed on the side of the pier 1. A limiting rod 18 penetrates through and is threadedly connected to the side block 17. The upper end of the limiting rod 18 can be inserted into the limiting sleeve 16. A guiding frame 19 is fixedly installed on the limiting rod 18. The guiding frame 19 is fixedly installed on the side block 17. A stepping motor 20 is fixedly installed on the guiding frame 19. A spline sleeve 21 is fixedly installed at the output shaft end of the stepping motor 20. A movable shaft 22 is spline - connected to the spline sleeve 21. The upper end of the movable shaft 22 is fixedly connected to the bottom of the limiting rod 18.

[0033] A reflective coating is provided on the outer surface of the limiting sleeve 16. An isolation cover 23 is fixedly installed at the bottom of the side block 17. The isolation cover 23 is installed outside the guiding frame 19 and the stepping motor 20.

[0034] Two cams 25 are rotatably mounted on the main body 3 at intervals. The surface of the cam 25 is made of a flexible material. The upper end of the cam 25 extends outside the main body 3, and the lower end of the cam 25 is set as a horizontal plane. Two connecting shafts 26 are rotatably mounted in the main body 3 at intervals. The connecting shaft 26 is fixedly connected to the cam 25. A synchronous belt mechanism 27 is installed between the two connecting shafts 26. A motor 28 is fixedly installed in the main body 3, and the output shaft of the motor 28 is fixedly connected to the connecting shaft 26.

[0035] The swing bridge mainly consists of bridge piers 1, a bridge deck structure 2, a rotating mechanism, a limiting mechanism, etc. The bridge deck structure 2 is installed on the bridge piers 1 through the rotating mechanism and can be rotated to open and close. The limiting mechanism is used to limit and fix the bridge deck structure 2.

[0036] A plurality of equally spaced water permeable grooves 6 are opened at the top of the main body 3 of the bridge deck structure 2. The lower end of the water permeable groove 6 communicates with the cavity 4 inside the main body 3, and both ends of the cavity 4 are communicated with the outside through drain grooves 5. When it rains, rainwater enters the cavity 4 through the water permeable grooves 6 and is then discharged to the outside through the drain grooves 5, realizing the drainage function of the bridge deck. The water permeable groove 6 is filled with a water filtering material 7, which can filter impurities in the rainwater and prevent blockage of the drainage channel. A plurality of equally spaced reinforcement structures are arranged in the cavity 4. The reinforcement structure consists of reinforcing ribs 8. The reinforcing rib 8 is formed by two rib strips that are cross - arranged and integrally formed. The end of the reinforcing rib 8 is fixedly connected to the main body 3, enhancing the strength and stability of the bridge deck structure 2.

[0037] The upper end of the connecting shaft 11 of the rotating mechanism is fixedly installed at the center of the bottom of the main body 3 of the bridge deck structure 2, and the lower end is rotatably installed on the bridge pier 1. A gear ring 12 is sleeved and fixedly installed on the connecting shaft 11. A plurality of servo motors 13 arranged in a circular array are fixedly installed on the bridge pier 1. The output shaft end of the servo motor 13 is fixedly installed with a driving wheel 14, and the driving wheel 14 meshes with the gear ring 12. When it is necessary to rotate the bridge deck structure 2, the servo motor 13 is started. The servo motor 13 drives the driving wheel 14 to rotate. The driving wheel 14 drives the connecting shaft 11 to rotate through meshing transmission with the gear ring 12, and then drives the bridge deck structure 2 to rotate on the bridge pier 1.

[0038] The two limit sleeves 16 of the limit mechanism are fixedly installed at the bottom of the main body 3 of the bridge deck structure 2, and a limit assembly is arranged below the limit sleeves 16. The side blocks 17 of the limit assembly are fixedly installed on the side of the pier 1, and a limit rod 18 passes through and is threadedly connected to the side blocks 17. The upper end of the limit rod 18 can be inserted into the limit sleeve 16. A guide frame 19 is fixedly installed on the limit rod 18, the guide frame 19 is fixedly installed on the side block 17, a stepping motor 20 is fixedly installed on the guide frame 19, a spline sleeve 21 is fixedly installed at the output shaft end of the stepping motor 20, a movable shaft 22 is spline-connected to the spline sleeve 21, and the upper end of the movable shaft 22 is fixedly connected to the bottom of the limit rod 18. When the bridge deck structure 2 rotates to a suitable position, the stepping motor 20 is started. The stepping motor 20 drives the spline sleeve 21 to rotate. The spline sleeve 21 drives the movable shaft 22 to rotate through the spline connection with the movable shaft 22. Since the movable shaft 22 is fixedly connected to the limit rod 18 and the limit rod 18 is threadedly connected to the side block 17, under the guiding action of the guide frame 19, the limit rod 18 moves upward and is inserted into the limit sleeve 16, so as to realize the limit fixation of the bridge deck structure 2.

[0039] Two cams arranged at intervals can be rotatably installed on the main body. The surface of the cams is made of a flexible material, the upper end extends outside the main body, and the lower end is set as a horizontal plane. Two connecting shafts arranged at intervals can be rotatably installed in the main body. The connecting shafts are fixedly connected to the cams, and a synchronous belt mechanism is installed between the two connecting shafts. A motor is fixedly installed in the main body, and the output shaft of the motor is fixedly connected to the connecting shaft. When the convex part of the cam is exposed on the upper surface, the cam can play the role of a speed bump. When the horizontal plane of the cam is exposed on the upper surface, the bridge deck is in a flat state.

[0040] The servo motor is used to drive the driving wheel to mesh with the gear ring for transmission, so as to realize the smooth rotation of the bridge deck structure. The bridge can be flexibly opened or closed according to actual needs, which is convenient for ships to pass through. A plurality of servo motors are distributed in a circular array to jointly drive the rotation of the bridge deck structure. The power distribution is uniform, the load of a single motor is reduced, and the stability and reliability of the rotation are improved.

[0041] By inserting the limit rod into the limit sleeve, the bridge deck structure can be accurately limited and fixed, ensuring the stability of the bridge in the opened or closed state and preventing the bridge deck structure from shaking. The stepping motor is used to drive the movement of the limit rod to realize the automatic operation of the limit mechanism, improving the convenience and efficiency of the operation. The reflective coating on the outer surface of the limit sleeve can improve its visibility at night and enhance safety; the setting of the protective cover and the isolation cover can protect the rotating mechanism and the limit mechanism from the influence of the external environment and reduce the probability of failure.

[0042] It should be noted that the circuits, electronic components and modules involved in the present invention are all prior arts and can be completely realized by those skilled in the art without further elaboration. The content protected by the present invention does not involve the improvement of software and methods.

[0043] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the above division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without making creative efforts, combine, add or delete the features in the embodiments of the present invention according to the situation, or make other adjustments, so as to obtain different technical solutions that essentially do not deviate from the concept of the present invention. These technical solutions also belong to the scope of protection of the present invention.

Claims

1. A structure of a horizontally rotating opening bridge, characterized in that, It includes a pier (1), a bridge deck structure (2) is arranged at the upper end of the pier (1), a rotating mechanism is installed between the bridge deck structure (2) and the pier (1), and the rotating mechanism is used to drive the bridge deck structure (2) to rotate on the pier (1); The bridge deck structure (2) includes a main body (3), the main body (3) is arranged at the upper end of the pier (1), a cavity (4) is formed inside the main body (3), drainage grooves (5) communicating with the cavity (4) are formed at both ends of the cavity (4), the other ends of the drainage grooves (5) communicate with the outside, a plurality of equally spaced water-permeable grooves (6) are formed at the top of the main body (3), the lower ends of the water-permeable grooves (6) all communicate with the cavity (4), filter water materials (7) are filled in the water-permeable grooves (6), the filter water materials (7) are fixedly connected to the main body (3), and a plurality of equally spaced reinforcement structures are arranged in the cavity (4). The reinforcement structure includes a reinforcing rib (8), and the reinforcing rib (8) is formed by two cross-shaped and integrally formed ribs. The ends of the reinforcing rib (8) are fixedly connected to the main body (3), and sector blocks (24) are fixedly installed at both ends of the main body (3).

2. The swing - type opening bridge structure according to claim 1, characterized in that, Guardrails (9) are fixedly installed on both sides of the top of the main body (3), a connecting strip (10) is arranged between the two guardrails (9), the connecting strip (10) is located at the upper end of the guardrails (9), and the ends of the connecting strip (10) are fixedly connected to the guardrails (9).

3. The swing - type opening bridge structure according to claim 1, characterized in that, An anti-rust coating is provided on the surface of the guardrail (9).

4. The swing - type opening bridge structure according to claim 1, wherein, The rotating mechanism includes a connecting shaft (11), the upper end of the connecting shaft (11) is fixedly installed at the center of the bottom of the main body (3), the lower end of the connecting shaft (11) is rotatably installed on the pier (1), a gear ring (12) is sleeved and fixedly installed on the connecting shaft (11), a plurality of servo motors (13) arranged in a circumferential array are fixedly installed on the pier (1), driving wheels (14) are fixedly installed at the output shaft ends of the servo motors (13), the driving wheels (14) are meshed with the gear ring (12), and the plurality of driving wheels (14) are arranged in a circumferential array around the gear ring (12).

5. The horizontal rotation type opening bridge structure according to claim 4, wherein, A protective cover (15) is fixedly installed outside the pier (1), and the protective cover (15) is installed outside the plurality of driving wheels (14), the gear ring (12) and the servo motors (13).

6. The horizontal rotating opening bridge structure according to claim 1, characterized in that, A limiting mechanism is installed on the pier (1), and the limiting mechanism is connected to the main body (3) and is used to limit the main body (3).

7. The swing - type opening bridge structure according to claim 6, wherein, The limiting mechanism includes two limiting sleeves (16) arranged at intervals. The limiting sleeves (16) are fixedly installed at the bottom of the main body (3). Limiting components are arranged below the limiting sleeves (16). The limiting components include side blocks (17). The side blocks (17) are fixedly installed on the sides of the bridge pier (1). A limiting rod (18) penetrates through and is threadedly connected to the side blocks (17). The upper end of the limiting rod (18) can be inserted into the limiting sleeve (16). A guiding frame (19) is fixedly installed on the limiting rod (18). The guiding frame (19) is fixedly installed on the side block (17). A stepping motor (20) is fixedly installed on the guiding frame (19). A spline sleeve (21) is fixedly installed at the output shaft end of the stepping motor (20). A movable shaft (22) is spline-connected to the spline sleeve (21). The upper end of the movable shaft (22) is fixedly connected to the bottom of the limiting rod (18).

8. The swing - type opening bridge structure according to claim 7, wherein, A reflective coating is provided on the outer surface of the limiting sleeve (16).

9. The swing - type opening bridge structure according to claim 7, characterized in that, An isolation cover (23) is fixedly installed at the bottom of the side block (17). The isolation cover (23) is installed outside the guiding frame (19) and the stepping motor (20).

10. The horizontal rotating opening bridge structure according to claim 1, characterized in that, Two cams (25) arranged at intervals are rotatably installed on the main body (3). The surface of the cams (25) is made of a flexible material. The upper ends of the cams (25) extend outside the main body (3). The lower ends of the cams (25) are set as horizontal planes. Two connecting shafts (26) arranged at intervals are rotatably installed inside the main body (3). The connecting shafts (26) are fixedly connected to the cams (25). A synchronous belt mechanism (27) is installed between the two connecting shafts (26). A motor (28) is fixedly installed inside the main body (3). The output shaft of the motor (28) is fixedly connected to the connecting shaft (26).

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