Synchronous rotating structure for vibrating screen

Abstract

The utility model relates to a synchronous rotating structure for a vibrating screen. The synchronous rotating structure comprises a base, a screen frame, a screen mesh, a vibrating assembly, a transmission crankshaft and a supporting assembly. The screen frame is arranged on the base through the supporting assembly, and the screen is installed in the screen frame. The vibration assembly comprises a vibration motor and an eccentric block; vibration motors are arranged on the left side and the right side of the top of the screen frame respectively, and eccentric blocks are arranged on output shafts of the vibration motors; the transmission crankshaft can be rotationally connected to vibration motors on the left side and the right side of the screen frame; during working, the vibration motors are started and rotate to drive the eccentric blocks to rotate, so that the transmission crankshafts connected with the vibration motors start to rotate, the vibration motors on the two sides of the device can synchronously rotate, and the device is more stable; the eccentric block generates exciting force, so that the screen frame connected with the vibration motor vibrates in the vertical direction. The vibrating screen has the advantages that vibration is more synchronous, screening efficiency is higher, and the exciting force can be adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration screening, in particular to a synchronous rotation structure for a vibrating screen. Background Art

[0002] At present, in the construction industry, sometimes different sizes of sand and gravel are needed to prepare concrete or cement mortar. Before using the sand and gravel, it is necessary to screen the sand and gravel. The diameters of the original materials are usually different. In the industrial aspect, it is necessary to classify them according to the diameter size. To achieve this goal, a vibrating screen is usually used at present. The existing vibrating screen is usually a straight screen with a slope. The screen plate is also called a perforated plate, which uses ordinary wire mesh and has good wear resistance. It is generally installed on a wire spring and screens the materials through the internal mesh holes. The vibrating motor drives the screen surface to vibrate up and down to screen the materials to be classified.

[0003] Since the existing vibrating screens usually have vibrating motors arranged on the left and right sides of the screen frame respectively to realize the vibrating screening of the materials by the device, the vibrating motors are usually arranged at the same horizontal height and use eccentric blocks to generate centrifugal exciting force to make the screen frame vibrate up and down. However, the vibrating efficiency of the current device is not high enough, and the size of the centrifugal exciting force cannot be controlled. It is easy to accelerate the jumping of the materials on the screen due to excessive exciting force, resulting in more severe wear of the screen, or the screening efficiency is not high due to too small exciting force. Moreover, the current vibrating screen may also cause the device to fail to screen successfully or even the device to tip over due to the non-synchronization of the vibrating motors on both sides of the screen frame, leading to safety problems.

[0004] Therefore, based on the deficiencies of the existing vibrating screens feedback by customers, the inventor made further improvements according to the proposed defects and deficiencies to overcome the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a vibrating screen with more synchronous vibration, higher screening efficiency and adjustable exciting force size.

[0006] The purpose of the utility model is realized by the following technical solutions: a synchronous rotation structure for a vibrating screen, including a base and a screen frame; the screen frame is arranged on the base through a support assembly and a screen mesh is installed in the screen frame; it is characterized in that: it further includes a vibration assembly and a transmission crankshaft.

[0007] The screen frame is arranged on the base through a support assembly and a screen mesh is installed in the screen frame;

[0008] The vibration assembly includes a vibration motor and an eccentric block; two groups of vibration motors are arranged on the left and right sides of the top of the screen frame respectively, and the eccentric block is arranged on the output shaft of the vibration motor.

[0009] The transmission crankshaft is rotatably connected to the output shafts of the vibration motors on the left and right sides of the sieve frame;

[0010] When working, start the vibration motors. The rotation of the vibration motors drives the eccentric blocks to rotate, and thus the connected transmission crankshaft also starts to rotate. The vibration motors on both sides of the device can rotate synchronously and the device is more stable; the eccentric blocks generate exciting forces, so that the sieve frame connected to the vibration motors vibrates in the up and down direction, and the material to be sieved is vibration-sieved on the sieve mesh.

[0011] As a preferred technical solution of the present application, motor mounting plates are provided at the tops of the left and right sides of the sieve frame. The vibration motors have double output shafts and are arranged through the motor mounting plates of the sieve frame. Two types of eccentric blocks are provided on both ends of the output shafts, namely fixed eccentric blocks and adjustable eccentric blocks. The adjustable eccentric blocks can be fixed by fastening bolts, and scales are provided on the motor end faces;

[0012] When adjusting the exciting force of the motor, remove the fastening bolts on the adjustable eccentric blocks, observe the scales, and rotate the adjustable eccentric blocks to adjust the angle between the adjustable eccentric blocks and the fixed eccentric blocks. The more the overlapping part, the greater the exciting force.

[0013] As a preferred technical solution of the present application, the vibration motors are symmetrically arranged on the left and right sides of the sieve frame, and a group of vibration motors on the same side are arranged in a high-low arrangement and are arranged in the motor mounting plates at the top of the sieve frame.

[0014] As a preferred technical solution of the present application, connecting rods are provided on the adjustable eccentric blocks, and the connecting rods on the adjustable eccentric blocks on the vibration motors on the left and right sides are connected to each other. When the vibration motors rotate, the adjustable eccentric blocks can rotate synchronously, avoiding low vibration efficiency caused by non-synchronization.

[0015] As a preferred technical solution of the present application, connecting blocks are sleeved at both ends of the transmission crankshaft and are horizontally connected to each other, and adjustable eccentric blocks are arranged in the middle part of the transmission crankshaft to prevent the connecting blocks from colliding with the connecting rods on the adjustable eccentric blocks during rotation.

[0016] The utility model has the following advantages:

[0017] (1) The device runs more smoothly and synchronously;

[0018] When arranging the vibrating components of the existing vibrating screen, usually one vibrating motor is set on each side of the frame for screening. Force is applied from both sides to drive the screen frame to vibrate. A connecting cylinder is used to horizontally connect the vibrating motors on both sides. However, the connecting cylinder cannot rotate along with the vibrating motor when it rotates. The connecting cylinder only plays the role of connection and support, and cannot ensure the synchronization of the rotation of the left and right motors. Due to the non-synchronization of the vibrating motors on the left and right sides, the magnitude of the exciting forces generated on the left and right sides will differ, resulting in the material shifting to one side during the vibration screening process, which is not conducive to screening and may even damage the device and cause the device to tip over. In this solution, a transmission crankshaft is arranged between the vibrating motors on the left and right sides of the screen frame for connection. The transmission crankshaft is a solid transmission crankshaft and can rotate along with the vibrating motor when it rotates. While playing the role of support, it can ensure the synchronization of the motor rotation, thereby ensuring the stable operation of the device. At the same time, connecting rods are also arranged on the eccentric blocks of the vibrating motors on both sides to be connected to each other to ensure the synchronization of the exciting forces and enhance the stability of the device.

[0019] (2) The vibrating motors are arranged in a high-low pattern, and the screening efficiency is higher;

[0020] Currently, the vibrating screen usually has vibrating motors respectively arranged on both sides of the screen frame, and an eccentric shaft and an eccentric block are arranged on the vibrating motor. By starting the motor to rotate, the eccentric block on the eccentric shaft is driven to rotate, generating a centrifugal exciting force to drive the screen frame to vibrate. Currently, the vibrating motors of the vibrating screen usually have one set on each of the left and right sides, with two vibrating motors in one set, arranged horizontally at the same height. During operation, the trajectory is an ellipse. In this solution, the vibrating motors on the left and right sides of the screen frame are arranged in a high-low position pattern. The formed elliptical motion trajectory is inclined and has a larger trajectory. The exciting force generated by its rotation is greater, and the screening efficiency is higher, thereby making the output higher. At the same time, the vibrating motor set in this solution has a double output shaft, and two eccentric blocks are respectively arranged on the output shafts at both ends of the vibrating motor, namely a fixed eccentric block and an adjustable eccentric block. By adjusting the angle between the adjustable eccentric block and the fixed eccentric block, the more the eccentric blocks on the same vibrating motor overlap, the greater the exciting force and the higher the screening efficiency. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the first perspective of the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the side view perspective of the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the top view perspective of the present utility model;

[0024] Figure 4 It is a schematic structural diagram of the present utility model after removing the screen mesh;

[0025] Figure 5 This is a schematic structural diagram of the support component and the vibration component of the present utility model;

[0026] In the figure: 101 - base, 102 - sieve frame, 103 - sieve mesh, 104 - spring A, 105 - mounting seat, 106 - feed inlet, 107 - discharge outlet, 108 - motor mounting plate, 109 - vibration motor, 110 - fixed eccentric block, 111 - adjustable eccentric block, 112 - motor protective cover, 113 - wire frame;

[0027] 201 - transmission crankshaft, 202 - connecting rod, 203 - connecting block. Specific embodiments

[0028] The following further describes the present utility model in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0029] It should be noted that the orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0030] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0031] Therefore, based on the above problems, referring to Figure 1 , the present utility model proposes a synchronous rotation structure for a vibrating screen to solve the problems.

[0032] (Embodiment 1)

[0033] Referring to Figures 1 to 5 , a synchronous rotation structure for a vibrating screen proposed in this implementation scheme includes a base 101, a sieve frame 102, a sieve mesh 103, a transmission crankshaft 201, a support component, and a vibration component;

[0034] Among them, referring to Figure 2 , the base 101 is horizontally placed on the ground, and a support component and a sieve frame 102 are arranged on the base 101;

[0035] Among them, referring to Figure 2 , the support component includes a spring A 104 and a mounting seat 105. One end of the spring A 104 is connected to the base 101, and the other end is connected to the mounting seat 105. The mounting seat 105 is fixedly connected to the sieve frame 102, and the sieve frame 102 is arranged on the base 101 through the support component;

[0036] Among them, referring to Figure 1 and Figure 2 , the screen 103 is arranged in the screen frame 102. A feed inlet 106 and a discharge outlet 107 are respectively arranged in front of and behind the screen frame 102. Motor mounting plates 108 are vertically upwardly arranged at the tops of the left and right sides of the screen frame 102, and vibration components are mounted on the motor mounting plates 108;

[0037] Among them, referring to Figure 4 and Figure 5 , the vibration components include vibration motors 109, eccentric blocks, and transmission crankshafts 201. Two vibration motors 109 are arranged on the motor mounting plates 108. The vibration motors 109 are double-output shaft motors. Eccentric blocks are sleeved on both ends of the double-output shafts of the vibration motors 109. The transmission crankshafts 201 are connected to two groups of vibration motors 109 located on the left and right sides of the screen frame;

[0038] Among them, referring to Figure 5 , connecting rods 202 are arranged on the symmetrically arranged eccentric blocks for connection, so that the vibration motors 109 vibrate synchronously.

[0039] During operation, first put the material into the feed inlet 106. The eccentric blocks on the vibration components have been adjusted to appropriate positions. Start the vibration motors 109. Through the rotation of the vibration motors 109, the eccentric blocks are driven to generate centrifugal force, so that the vibration components drive the screen frame 102 to vibrate in the up and down direction. Since the vibration components on the left and right sides of the screen frame 102 are connected by the transmission crankshafts 201 and keep the rotation of the vibration motors 109 synchronous, the stability of the device during vibration is ensured. The connecting rods arranged on the eccentric blocks also ensure the synchronization of the vibration and will not cause the device to tip over due to asynchronous vibration. The material entering the vibrating screen is sieved on the screen 103 due to the vibration of the vibration components.

[0040] This solution designs a vibrating screen that uses a transmission crankshaft 201. Currently, the existing vibrating screens for screening materials usually divide the vibrating motors 109 into two groups and set them on the left and right sides of the sieve frame 102 for screening respectively. By rotating the vibrating motors 109, the eccentric blocks on the vibrating motors 109 are driven to rotate, thereby generating a polarization force to vibrate the device. The vibrating motors 109 on the left and right sides are usually connected by a connecting cylinder. The connecting cylinder is a hollow cylinder and does not rotate with the vibrating motor 109. It only plays a supporting and connecting role. This design cannot ensure the synchronous rotation of the vibrating motors 109 on the left and right sides, resulting in asynchronous vibration - the screened materials tend to one side or the device tilts and overturns; in this solution, a transmission crankshaft 201 is arranged between the vibrating motors 109 on the left and right sides of the sieve frame 102. The transmission crankshaft 201 is a solid transmission crankshaft 201 and can rotate with the vibrating motor 109, ensuring the synchronization of the two motors. Thus, the device is more stable during the working process. At the same time, a connecting rod 202 is arranged on the eccentric block. Through the connecting rods 202 connected on both sides, the eccentric blocks move synchronously, ensuring that the device does not overturn.

[0041] In this embodiment, referring to Figure 1 , for the design of the base 101, the base 101 is a rectangular frame. Four supporting feet are respectively vertically arranged downward at the four top corners of the frame. The base 101 is horizontally arranged on the ground through the four supporting feet.

[0042] In this embodiment, referring to Figure 1 , for the design of the sieve mesh 103, a plurality of cylindrical wire frames 113 are horizontally arranged in the sieve frame 102. The wire frames 113 are connected to and support the left and right side plates of the sieve frame 102. The sieve mesh 103 is arranged on the wire frames 113. A plurality of sieve holes are opened on the sieve mesh 103. The left and right sides of the sieve mesh 103 are connected to the left and right side plates of the sieve frame 102 by screws.

[0043] In this embodiment, referring to Figure 1 and Figure 2, for the support components, two support components are arranged on each of the long sides of the square frames on both sides of the base 101, and the support components on the left and right sides are symmetrically arranged - that is, a total of four support components are symmetrically arranged in pairs on the base 101. The support component includes three springs A104 and two mounting seats 105. The three springs A104 are arranged vertically side by side on the base 101. One end of the spring A104 is connected to the upper surface of the base 101, and the other end is connected to the bottom surfaces of the two mounting seats 105. The two mounting seats 105 are both right-angled triangle frames. The short right-angled end faces are fixedly connected to a mounting plate. The upper end faces of the springs A104 are fixedly connected to the lower end face of the mounting plate - that is, the mounting seats 105 are arranged above the springs A104. The long right-angled end faces of the mounting seats 105 are fixedly connected to the side walls of the sieve frame 102. When the vibration motor 109 located at the top of the sieve frame 102 starts to work and drives the sieve frame 102 to vibrate up and down, the support components can play a role in supporting the entire sieve frame 102. Setting the springs A104 instead of the feet of the sieve frame 102 can play a role in supporting and fixing the sieve frame 102 without affecting the vibration of the sieve frame 102.

[0044] In this embodiment, refer to Figure 1 and Figure 2 , for the sieve frame 102, the sieve frame 102 includes two side plates and a wire mesh frame 113. The two side plates are respectively fixedly connected to their corresponding support components, and the two side plates are connected to each other through a plurality of wire mesh frames 113. A sieve mesh 103 is laid on the wire mesh frame 113. A front plate and a rear plate are arranged at the front and rear ends of the two symmetrically arranged side plates. One end of the front plate is connected to the left side plate, and the other end is connected to the right side plate. A feed inlet 106 is opened at the top end of the front plate. The rear plate also connects the two side plates at the rear end. A discharge outlet 107 is opened at the position of the sieve mesh 103 on the rear plate. When the vibration motor 109 located at the top rotates, the material enters the sieve mesh 103 from the feed inlet 106, and then the sieve frame 102 vibrates in the up and down direction by the rotation of the vibration motor 109. Thus, the sieve mesh 103 connected to the sieve frame 102 also vibrates accordingly to screen the material. The screened material finally comes out through the discharge outlet 107.

[0045] In this embodiment, refer to Figures 3 to 5, for the vibration assembly, at the tops of the left and right side plates of the sieve frame 102, motor mounting plates 108 are respectively fixedly connected. The motor mounting plates 108 are vertically arranged on the side plates and the motor mounting plates 108 are trapezoidal in shape. Mounting holes are provided on the motor mounting plates 108. The vibration motor 109 has double output shafts and is inserted into the mounting holes on the motor mounting plates 108. Eccentric blocks are connected to the output shafts at both ends of the vibration motor 109. And two transmission crankshafts 201 are respectively connected to four vibration motors 109 which are symmetrical on the motor mounting plates 108 on the left and right sides of the sieve frame 102. Through the transmission crankshafts 201, it can be ensured that the vibration motors 109 on the left and right sides rotate synchronously. The two transmission crankshafts 201 are connected by a connection block 203. The connection block 203 is sleeved on the transmission crankshaft 201. A set of connection blocks 203 is provided at both ends of the transmission crankshaft 201 to achieve the effect of the same weight. At the same time, the adjustable eccentric block 111 located inside the vibration motor 109 is arranged at a position closer to the inside of the rotating crankshaft 13 (the position sequence on the same axis is vibration motor 109, fixed eccentric block 110, connection block 203, adjustable eccentric block 111). A connecting rod 202 is provided on the adjustable eccentric block. The adjustable eccentric blocks 111 on both side plates are connected by the connecting rod 202. Such a design can ensure that when rotating, the connecting rod 202 and the connection block 203 will not collide and interfere with each other.

[0046] Furthermore, for the eccentric block, the shape of the eccentric block is similar to a sector, and a through hole is provided at its apex angle. Two eccentric blocks are sleeved on each output shaft of the vibration motor 109 - that is, 4 eccentric blocks are provided on each vibration motor 109. The more the eccentric blocks located on the same vibration motor 109 overlap with each other, the greater the exciting force. The two eccentric blocks sleeved on each output shaft are respectively an inner eccentric block (close to the motor) and an outer eccentric block. The inner eccentric block is a fixed eccentric block 110, which is fixed by a key and cannot rotate. The outer eccentric block is an adjustable eccentric block 111, which is locked by a detachable fastening bolt. Scales are provided on the two end faces of the vibration motor 109. After adjusting the angle between the fixed eccentric block 110 and the adjustable eccentric block 111 by referring to the scales, the adjustable eccentric block 111 is pressed by the fastening bolt, so as to control the overlapping angle of the two eccentric blocks, and thus control the magnitude of the exciting force. When the four eccentric blocks on the same axis overlap more, the output shaft receives a greater gravity in the same direction. When the vibration motor 109 starts to rotate, the output shaft also rotates accordingly. At the same time, the eccentric blocks rotate, so under the action of the centrifugal force of the eccentric blocks, the sieve frame 102 connected to the vibration assembly vibrates up and down.

[0047] Furthermore, for the vibration motors 109, the two mounting holes on the motor mounting plate 108 are not arranged on the same plane, but are arranged in a high-low manner - that is, the two vibration motors 109 mounted therein are also arranged in a high-low manner; after the vibration motors 109 and the eccentric blocks are installed, the motor protective cover 112 is covered outside the vibration motors 109 by screw connection.

[0048] It should be noted that the height difference between the axes of the two vibration motors 109 mounted on the same motor mounting plate 108 is the golden section angle.

[0049] The utility model relates to a vibrating screen adopting a transmission crankshaft 201. First, two groups of vibration motors 109 arranged at the top of the screen frame 102 drive the screen frame 102 to vibrate. The material to be screened enters the screen mesh 103 from the feed inlet 106. After the vibration motors 109 are started, the vibration motors 109 start to rotate, driving the eccentric blocks to rotate, thereby generating an exciting force, causing the screen frame 102 to vibrate in the up-down direction. The material is screened through vibration on the screen mesh. Finally, the material with a diameter larger than the screen holes comes out from the discharge outlet 107; currently, in existing vibrating screens, usually a group of vibration motors 109 are arranged on each of the left and right sides of the screen frame 102 for screening materials. The vibration motors 109 on the left and right sides are connected by a connecting cylinder. The connecting cylinder is a hollow cylinder, and the connecting cylinder does not rotate while the motor is rotating, resulting in the problem that the left and right motors of the existing vibrating screen rotate out of sync. The asynchronous rotation of the motors will cause the eccentric blocks to rotate out of sync, thereby generating different exciting forces on the left and right sides, causing the material on the screen mesh 103 to tend to one side during the screening process, resulting in a lower screening efficiency, and even damaging the device and causing the device to tip over.

[0050] This solution sets up a transmission crankshaft 201 for these problems. The transmission crankshaft 201 is a solid transmission crankshaft 201 and can rotate with the rotation of the vibration motors 109, making the rotation of the vibration motors 109 synchronous, so that the exciting forces are the same, and the device is stable and does not tilt during the screening process; at the same time, a connecting rod 202 is also set up. The connecting rod 202 connects the adjustable eccentric blocks 111 on the left and right sides of the screen frame 102, making the rotation of the eccentric blocks synchronous, realizing the synchronization of the device vibration, and avoiding the material to be screened from tending to one side on the screen mesh 103, resulting in a low screening efficiency, and even damaging the device and causing the device to tip over; this solution arranges the vibration motors 109 on the same side in a high-low manner, making the vibration motors 109 form an inclined elliptical motion trajectory when rotating, making the screening efficiency higher. An eccentric block is provided on each vibration motor 109. The eccentric block is a combination of an adjustable eccentric block 111 and a fixed eccentric block 110. By controlling the position of the adjustable eccentric block 111, the angle of coincidence between it and the fixed eccentric block 110 is different, thereby adjusting the magnitude of the exciting force - adjusting the vibration frequency.

[0051] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A synchronous rotation structure for a vibrating screen, comprising a base (101) and a screen frame (102); the screen frame (102) is arranged on the base (101) through a support assembly, and a screen mesh (103) is installed in the screen frame (102). Vibration motors (109) are arranged on the left and right side frames of the screen frame, and eccentric blocks are arranged on the vibration motors; it is characterized in that: It further includes a transmission crankshaft (201); The transmission crankshaft (201) is rotatably connected to vibration motors (109) on the left and right sides of the sieve frame (102); When working, start the vibration motors (109). The vibration motors (109) rotate to drive the eccentric blocks to rotate, so that the connected transmission crankshaft (201) also starts to rotate, and the vibration motors (109) on both sides of the device can rotate synchronously; the eccentric blocks generate exciting forces, so that the sieve frame (102) connected to the vibration motors (109) vibrates in the up and down direction, and the material to be screened is vibration-screened on the sieve mesh (103).

2. The synchronous rotation structure for a vibrating screen according to claim 1, characterized in that: Motor mounting plates (108) are provided at the tops of the left and right sides of the sieve frame (102). The vibration motors (109) have double output shafts and are arranged through the motor mounting plates (108) of the sieve frame (102). Two types of eccentric blocks, namely fixed eccentric blocks (110) and adjustable eccentric blocks (111), are provided on both ends of the output shafts. The adjustable eccentric blocks (111) can be fixed by fastening bolts, and scales are provided on the motor end faces; When adjusting the exciting force of the motor, remove the fastening bolts on the adjustable eccentric blocks (111), observe the scales, and rotate the adjustable eccentric blocks (111) to adjust the angle between the adjustable eccentric blocks (111) and the fixed eccentric blocks (110). The more the overlapping part is, the greater the exciting force is.

3. The synchronous rotation structure for a vibrating screen according to claim 2, wherein: The vibration motors (109) are symmetrically arranged on the left and right sides of the sieve frame (102), and a group of two vibration motors (109) on the same side are arranged in a high-low order.

4. The synchronous rotation structure for a vibrating screen according to claim 2, wherein: Link rods (202) are provided on the adjustable eccentric blocks (111). The link rods (202) on the adjustable eccentric blocks (111) provided on the left and right vibration motors (109) are connected to each other, and the adjustable eccentric blocks (111) can rotate synchronously when the vibration motors (109) rotate.

5. The synchronous rotation structure for a vibrating screen according to claim 1, characterized in that: Connecting blocks (203) are sleeved at both ends of the transmission crankshaft (201) and are transversely connected to each other, and adjustable eccentric blocks (111) are provided in the middle part of the transmission crankshaft (201) to prevent the connecting blocks (203) from colliding with the link rods (202) on the adjustable eccentric blocks (111) during rotation.

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