Fixed belt wheel transmission system with buffering starting function

Abstract

A fixed belt wheel transmission system with a buffer starting function comprises a belt wheel device and a transmission device. The belt wheel device comprises a fixing frame, a first belt wheel, a second belt wheel, a belt and two eccentric seat sets. The first belt wheel and the second belt wheel are arranged on the fixing frame in a shaft mode. And the eccentric seat groups are respectively adjustably arranged on two opposite sides of the second belt wheel through shafts. And each eccentric seat group is used for adjusting the position of the second belt wheel and is provided with a rotatable eccentric seat. The eccentric seat is provided with an eccentric shaft hole. And the transmission device comprises a transmission shaft group axially arranged on the second belt wheel and the eccentric seat group, and a gear box unit connected with the transmission shaft group. The gear box unit is provided with the clutch used for coupling or disengaging the power connection of the transmission shaft set, the clutch and the belt wheel device are separated into two independent devices, the buffering starting function capable of disconnecting the power connection is achieved, and the situation that due to the too low rotating speed, torsion is insufficient, and elements of the transmission device are damaged can be avoided.

Description

Technical Field

[0001] The utility model relates to a transmission system, in particular to a fixed pulley transmission system with a buffer starting function. Background Art

[0002] See also Figure 1 The light helicopter piston engine transmission system disclosed in the Chinese invention patent announcement No. CN113942655B includes a piston engine 11, a pulley set 12 connected to the piston engine 11, a transmission shaft 13 connected to the pulley set 12, and a reducer 14 connected to the transmission shaft 13. A helicopter rotor (not shown) is arranged on the top shaft of the reducer 14.

[0003] The pulley assembly 12 comprises a lower pulley 121 axially connected to the piston engine 11, an upper pulley 122 located above the lower pulley 121 and connected to the transmission shaft 13, a belt 123 rotatably wound around the upper pulley 122 and the lower pulley 121, and an electric actuator 124 telescopically connected between the upper pulley 122 and the lower pulley 121. By changing the telescopic stroke of the electric actuator 124, the distance between the upper pulley 122 and the lower pulley 121 can be changed, so as to realize the tension or relaxation of the belt 123, thereby achieving the clutch function of power transmission or separation.

[0004] In order to overcome the displacement of the upper pulley 122 or the lower pulley 121 caused by the vibration during flight, the electric actuator 124 will automatically compensate for its displacement and adjust the tension of the belt 123 telescopically. However, during flight, the electric actuator 124 may need to compensate automatically frequently, causing the telescopic stroke to be delayed or advanced, resulting in errors or vibration compensation problems. In addition, during the flight of the light helicopter, the vibration of the body, shaft or rotating part near the upper pulley 122 or the lower pulley 121 will cause the axial or radial displacement of the upper pulley 122 and the lower pulley 121. Alternatively, if there is a slight misalignment of the belt 123 during the initial installation and it is not discovered immediately, these will cause the belt 123 to jump off the upper pulley 122 or the lower pulley 121 during operation, causing the light helicopter to lose power unexpectedly, which is in urgent need of improvement. Utility Model Content

[0005] The utility model aims to provide a fixed pulley transmission system with a buffer start function which does not require adjusting the belt tension during the transmission process.

[0006] The fixed pulley transmission system with buffer start function described in the utility model is suitable for transmitting kinetic energy. The fixed pulley transmission system with buffer start function includes a pulley device and a transmission device. The pulley device includes a fixed frame, a first pulley, a second pulley, a belt, and two eccentric seat groups. The fixed frame has two first openings spaced opposite to each other in a first direction, and two second openings spaced opposite to each other in the first direction. The first opening and the second opening are spaced apart in a second direction perpendicular to the first direction. The first pulley shaft is arranged in the first opening of the fixed frame. The second pulley shaft is arranged in the second opening of the fixed frame. The belt is rotatably sleeved on the first pulley and the second pulley. The eccentric seat groups are respectively adjustable and arranged in the second opening of the fixed frame, and the shafts are arranged on the two opposite sides of the second pulley. Each of the eccentric seat groups is used to adjust the position of the second pulley in the second direction, and has an eccentric seat that can rotate relative to the respective second openings. The eccentric seat has an eccentric shaft hole eccentrically arranged relative to the outer periphery.

[0007] The transmission device is connected to the pulley device and comprises a transmission shaft group rotatably arranged between the second pulley and the eccentric seat group, and a gear box unit connected to the transmission shaft group. The gear box unit has a clutch for coupling or disconnecting the power connection of the transmission shaft group.

[0008] In the fixed pulley transmission system with buffer start function described in the utility model, each of the eccentric seats also has a plurality of adjustment holes surrounding the respective eccentric shaft holes, and the eccentric seat can be rotated by applying force to at least one of the adjustment holes.

[0009] The fixed pulley transmission system with buffer starting function described in the utility model comprises each of the eccentric seats including a seat body passing through a corresponding second opening, and a flange extending outward from the outer periphery of the seat body and resting against the fixed frame, the eccentric shaft hole passes through the seat body and the flange, and the seat body is formed with the adjustment hole.

[0010] In the fixed pulley transmission system with buffer start function described in the utility model, each of the eccentric seat groups also has at least one positioning plate for fixing the respective eccentric seat on the fixing frame, and the positioning plate is detachably fixed to the fixing frame.

[0011] The fixed pulley transmission system with buffer start function described in the utility model, the transmission shaft group is connected between the clutch and the pulley device, the transmission shaft group has multiple shafts and multiple couplings, and each coupling is connected between two adjacent shafts.

[0012] The fixed pulley transmission system with buffered starting function described in the utility model, the gear box unit also has a gear box and a clutch control module for controlling the clutch, the clutch is connected between the gear box and the transmission shaft group, and the clutch control module controls the clutch through hydraulic pressure.

[0013] The fixed pulley transmission system with buffered starting function described in the utility model comprises a clutch control module having an oil circuit fluidly connected to the clutch, a hydraulic electric pump for transmitting hydraulic oil in the oil circuit, a solenoid valve for controlling the opening or closing of the oil circuit, a regulating valve for adjusting the flow rate of the oil circuit, and an electronic switch for controlling the hydraulic electric pump and the solenoid valve.

[0014] In the fixed pulley transmission system with buffer start function described in the utility model, the clutch control module also has a pressure switch for detecting the pressure of the oil circuit.

[0015] The fixed pulley transmission system with buffered starting function described in the utility model, the clutch is a controllable friction clutch, and has a disc plate for coupling the transmission shaft group and the gear box, and a piston that can movably push the disc plate, the clutch control module is used to inject hydraulic oil into the clutch and push the piston to move, so as to drive the disc plate to disengage from the power connection with the transmission shaft group.

[0016] In the fixed pulley transmission system with buffer start function described in the utility model, the clutch also has a position sensor, and the position sensor is used to sense the position of the piston.

[0017] The beneficial effects of the utility model are as follows: the fixed pulley transmission system with a buffered start function of the utility model has a buffered start function that can disconnect the power connection by separating the clutch and the pulley device into two independent devices, which can avoid the damage of the components of the transmission device caused by insufficient torque due to too low a speed. And because the first pulley and the second pulley are fixed to the fixed frame, the first pulley and the second pulley will not be angularly or axially misaligned due to improper initial installation or vibration, so the belt will not jump off, and the stability is good and the safety is high. During the transmission process, there is no need to adjust the tension of the belt, and the clutch does not need to be actuated again, so the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0019] Figure 1It is a schematic diagram of the transmission system of a light helicopter piston engine disclosed in China's invention patent announcement No. CN113942655B;

[0020] Figure 2 It is a front view of an embodiment of the fixed pulley transmission system with buffer start function of the utility model;

[0021] Figure 3 is a perspective view of a pulley device of the embodiment;

[0022] Figure 4 is a side view of the pulley device;

[0023] Figure 5 It is along Figure 4 An incomplete cross-sectional view taken along line VV in FIG.

[0024] Figure 6 is a perspective exploded view of the pulley device;

[0025] Figure 7 is a fragmentary side view of an eccentric seat of the pulley device mounted on a fixed frame;

[0026] Figure 8 is a fragmentary top view of a gearbox unit of the embodiment;

[0027] Fig. 9 is an incomplete cross-sectional schematic diagram of the gearbox unit;

[0028] Fig.10 is a fragmentary schematic diagram of a clutch control module of the described embodiment;

[0029] Fig.11 It is an incomplete power transmission schematic diagram of installing the utility model on a helicopter;

[0030] Fig.12 is a front view schematic diagram illustrating the connection relationship between a power source of the helicopter and the pulley transmission system;

[0031] Fig.13 is a startup flow chart of the helicopter; and

[0032] Fig.14 It is an incomplete power transmission schematic diagram of installing the utility model on a power generation device. DETAILED DESCRIPTION

[0033] See also Figures 2 to 4The embodiment of the fixed pulley transmission system with buffer start function of the utility model is suitable for transmitting kinetic energy and / or changing the kinetic energy transmission angle. The pulley transmission system 200 includes a pulley device 201 and a transmission device 202.

[0034] See also Figure 3 , Figure 5 and Figure 6 , the pulley device 201 includes a fixed frame 21, a first pulley 22, a second pulley 23, a belt 24, and two eccentric seat groups 25. The fixed frame 21 has two frames 211 spaced opposite to each other in a first direction X, and a plurality of connecting plates 212 connecting the frames 211 along the first direction X. The fixed frame 21 of this embodiment is made of aluminum alloy, which has the advantage of being lightweight. Each of the frames 211 has a first opening 213, a second opening 214 spaced apart from the first opening 213 in a second direction Z perpendicular to the first direction X, and a plurality of circular holes 215 surrounding the second opening 214. The second openings 214 of the frame 211 are spaced opposite to each other in the first direction X. Each of the frames 211 of this embodiment has six circular holes 215, and the circular holes 215 are staggered at equal angles in the circumferential direction. In this embodiment, the first direction X is the front-to-back direction, the second direction Z is the up-down direction, and the second opening 214 is located above the first opening 213 .

[0035] See also Figure 3 and Figure 4 Each of the frames 211 further has two side edges 216 spaced apart in a horizontal direction Y perpendicular to the first direction X and the second direction Z. The side edges 216 of this embodiment gradually expand and extend from top to bottom.

[0036] See also Figure 3 , Figure 5 and Figure 6The first pulley 22 is installed between the frames 211 and has a first shaft hole 221 aligned with the first opening 213. A short shaft 222 is inserted into the first shaft hole 221 and the first opening 213, so that the first pulley 22 can be rotatably arranged in the first opening 213. The second pulley 23 is installed between the frames 211 and has a second shaft hole 231 aligned with the second opening 214. A short shaft 232 is inserted into the second shaft hole 231 and the second opening 214, so that the second pulley 23 can be rotatably arranged in the second opening 214. The belt 24 is rotatably sleeved on the first pulley 22 and the second pulley 23. The first pulley 22 and the second pulley 23 are, for example but not limited to, high torque pulleys. The belt 24 is, for example but not limited to, a rubber belt, a synthetic belt, a metal belt or a chain, and the number can be one, two or more.

[0037] In order to prevent each tooth groove of the belt 24 from always engaging with the same position of the first pulley 22 or the second pulley 23, a first pulley 22 and a second pulley 23 with different teeth are used, and the side edge 216 is designed to gradually expand from top to bottom to match the first pulley 22 and the second pulley 23 with different diameters, thereby improving the operating stability.

[0038] The eccentric seat groups 25 are respectively adjustably arranged on the second openings 214 of the fixing frame 21 and are arranged on the front and rear sides of the second pulley 23 along the first direction X axis. Each of the eccentric seat groups 25 is also provided for the short shaft 232 to pass through and is used to adjust the position of the second pulley 23 in the second direction Z. Each of the eccentric seat groups 25 has an eccentric seat 251 that can rotate relative to the respective second opening 214, a bearing 252 installed between the eccentric seat 251 and the short shaft 232, and at least one positioning plate 253 for fixing the respective eccentric seat 251 to the respective frame 211. Each of the eccentric seat groups 25 of this embodiment has two positioning plates 253. The following description is based on the eccentric seat group 25 on the rear side as an example:

[0039] See also Figures 4 to 6 The eccentric seat 251 includes a seat body 254 extending from the corresponding second opening 214, a flange 255 extending outward from the outer periphery of the seat body 254 and abutting against the frame body 211, and an eccentric shaft hole 256 penetrating the seat body 254 and the flange 255. The positioning plate 253 is detachably fixed to the frame body 211 and sandwiches the flange 255 of the eccentric seat 251 from the front and rear sides. Each positioning plate 253 has a plurality of locking holes 257 respectively used to be locked to the circular holes 215 of the frame body 211.

[0040] See also Figure 4 , Figure 6 and Figure 7 The seat body 254 of the eccentric seat 251 is circular and has a plurality of adjustment holes 258 surrounding the eccentric shaft hole 256. The eccentric shaft hole 256 is eccentrically arranged relative to the outer periphery of the seat body 254. Figure 7 In the embodiment, the center of the outer periphery of the seat body 254 is represented by P1, and the center of the eccentric shaft hole 256 is represented by P2, and P1 and P2 do not overlap. The seat body 254 of this embodiment has six adjustment holes 258, and the adjustment holes 258 are staggered at equal angles in the circumferential direction of the eccentric shaft hole 256.

[0041] See also Figure 3 , Figure 4 and Figure 7 By loosening one of the positioning plates 253 and inserting a commercially available two-point wrench tool (not shown) into two of the adjustment holes 258, the eccentric seat 251 can be rotated by force, so that the eccentric seat 251 moves in a circular motion relative to the second opening 214, and the second pulley 23 can be driven to move slightly in the second direction Z. If the eccentric seat group 25 is rotated equally at the same time, the second pulley 23 will be driven to move vertically up and down, thereby tightening or loosening the belt 24 to adjust the tension of the belt 24. If only one of the eccentric seat groups 25 is adjusted, or the eccentric seat group 25 is adjusted unequally, the short axis 232 of the second pulley 23 will be driven to tilt forward and backward, thereby generating a slight radial displacement. In this way, the axis of the second pulley 23 can be corrected to be parallel to the axis of the first pulley 22.

[0042] See also Figure 2 , Figure 8 and Fig. 9 The transmission device 202 is connected to the pulley device 201 and includes a transmission shaft group 3 rotatably arranged on the short shaft 232 of the second pulley 23, and a gear box unit 4 connected to the transmission shaft group 3.

[0043] The transmission shaft group 3 is connected to the short shaft 232 of the second pulley 23 along the first direction X and has two shafts 31 and two couplings 32. One of the couplings 32 connects the short shaft 232 and one of the shafts 31, and the other coupling 32 connects the shaft 31. The transmission shaft group 3 is used for power coupling between the pulley device 201 and the gear box unit 4. During the power transmission process, the coupling 32 also has the characteristics of absorbing small vibrations and out-of-roundness.

[0044] The gearbox unit 4 has a gearbox 41, a clutch 42 for coupling or disengaging the power connection of the transmission shaft group 3, and a clutch control module 43 for controlling the clutch 42. The gearbox 41 uses the gear ratio change to achieve the purpose of acceleration and deceleration, and can also have the function of changing the power transmission angle. The gearbox 41 is a prior art and has many variations. Those skilled in the art can infer the expanded details based on the above description, so no further description is given.

[0045] The clutch 42 is connected between the gear box 41 and the transmission shaft group 3. The clutch 42 of this embodiment is a high-efficiency friction clutch, and has a housing 421, a disc plate 422 installed in the housing 421 and used to couple the transmission shaft group 3 and the gear box 41, a piston 423 connected to the transmission shaft group 3 and capable of movably pushing the disc plate 422, and a position sensor 424 connected to the clutch control module 43 by signal. The housing 421 and the piston 423 cooperate to define an oil chamber 420 for hydraulic oil (not shown) to flow. The housing 421 has an oil inlet hole 425 and an oil return hole 426 that are fluidically connected to the oil chamber 420. The piston 423 has an oil pan 427 sleeved on the transmission shaft group 3, and a piston body 428 connected to the oil pan 427 and facing the disc plate 422. The piston body 428 is used to push a central pawl (not shown) of the disc plate 422 to loosen the outer end of the disc plate 422 and to disengage the coupling with the gear box 41. The clutch 42 of this embodiment is a high-efficiency friction clutch that can transmit high torque and has good heat resistance, so it has high stability and long service life. Since the existing clutch technology has many variations, those skilled in the art can infer and expand the details based on the above description, so no further description is given.

[0046] See also Figure 2 , Fig. 9 and Fig.10, the clutch control module 43 controls the clutch 42 by electronically controlling the hydraulic pressure. The clutch control module 43 of this embodiment is used to inject or discharge hydraulic oil into or out of the clutch 42 and push the piston 423 to move, so as to drive the disc plate 422 to cut off or couple the power connection between the clutch 42 and the transmission shaft group 3. The clutch control module 43 has an oil circuit 431 that is fluidically connected to the oil chamber 420 of the clutch 42, a hydraulic electric pump 432 for transmitting hydraulic oil in the oil circuit 431, a solenoid valve 433 for controlling the opening or closing of the oil circuit 431, a regulating valve 434 for adjusting the flow rate of the hydraulic oil in the oil circuit 431, a pressure switch 435 for detecting the pressure of the oil circuit 431, and an electronic switch 436 for controlling the hydraulic electric pump 432 and the solenoid valve 433.

[0047] The oil circuit 431 has an input end 437 fluidly connected to a hydraulic oil tank 44, an output end 438 fluidly connected to the oil inlet hole 425 and for the hydraulic oil to flow from the input end 437 into the oil chamber 420, a return end 439 fluidly connected to the oil return hole 426 and for the hydraulic oil to flow from the oil chamber 420 to the hydraulic oil tank 44, and a return end 440 fluidly connected between the return end 439 and the hydraulic oil tank 44.

[0048] When the clutch control module 43 controls the hydraulic oil to flow into the oil chamber 420 from the oil inlet hole 425 (i.e., pressurization), it will push the oil pan 427 to drive the piston body 428 to move, so that the disc plate 422 is disconnected from the gear box 41. The position sensor 424 senses that the piston 423 moves to the appropriate position to ensure that the gear box 41 is disconnected from the power connection with the drive shaft group 3. The clutch control module 43 will then turn off the hydraulic electric pump 432 to stop the oil supply.

[0049] When the clutch control module 43 controls the hydraulic oil to flow out of the oil chamber 420 from the oil return hole 426 (i.e., pressure relief), the piston body 428 disengages from the disc plate 422, and the disc plate 422 couples to the gear box 41, so that the transmission shaft group 3 and the gear box 41 are coupled to each other to generate a power connection.

[0050] The pulley transmission system 200 separates the clutch 42 and the pulley device 201 into two independent devices, controls the engagement and disengagement of the clutch 42 by means of electric hydraulic control, and can also adjust the flow rate of the hydraulic oil by means of the regulating valve 434 to control the coupling speed of the clutch 42.

[0051] See also Figures 11 to 13The utility model can be installed on a helicopter, and transmits power and / or changes the power transmission angle through the pulley transmission system 200, and flexibly adjusts the start timing of power transmission. The helicopter is a light helicopter and includes the aforementioned pulley transmission system 200, a power source 51 and a rotating unit 52. The pulley transmission system 200 is used to transmit the power of the power source 51 to drive the rotating unit 52 to operate.

[0052] The power source 51 is, for example but not limited to, an internal combustion engine and is used to provide power and is connected to the first pulley 22 of the pulley device 201 .

[0053] The rotating unit 52 is connected to the gear box unit 4 and can be driven by the pulley transmission system 200 to rotate. Fig.11 The dotted arrow in the figure indicates the direction of kinetic energy transfer.

[0054] The pulley device 201 further includes a bracket assembly 26 for positioning the pulley transmission system 200 on the power source 51 , and an adapter seat 27 for connecting the power source 51 and the first pulley 22 of the pulley device 201 .

[0055] To install the pulley device 201 in front of the helicopter, the pulley device 201 must first be assembled and calibrated on the ground. The assembly method is as follows:

[0056] First, the first pulley 22, the second pulley 23 and related accessories are installed on the fixing frame 21. Since the first pulley 22 and the second pulley 23 are fixed to the first opening 213 and the second opening 214 of the fixing frame 21, they have a preliminary positioning function, which can prevent the first pulley 22 and the second pulley 23 from being installed misaligned. Then, the belt 24 can be adjusted to the required tension by fine-tuning the position of the second pulley 23 using the two-point wrench tool. After a long-term flight test, the positions of the first pulley 22, the second pulley 23 and the belt 24 of this embodiment are not offset, so there is no need to adjust the tension of the belt 24 during flight, and the safety is high. In addition, since the first pulley 22 and the second pulley 23 are fixed to the first opening 213 and the second opening 214 of the fixing frame 21, they will not be offset, so the belt 24 will not jump off, and the first pulley 22 and the second pulley 23 will not be angularly or axially dislocated, and the stability is good.

[0057] Next, the buffer start function of this embodiment is described:

[0058] When the helicopter is in an unstarted state on the ground, the clutch 42 is coupled to the transmission shaft group 3. Before starting the power source 51, the pilot will first control the clutch control module 43 to disengage the clutch 42 from the transmission shaft group 3, and then start the power source 51. This is to avoid the kinetic energy loss of the power source 51 at a low speed. After the pilot sees that the tachometer (not shown) of the power source 51 shows that the speed of the power source 51 reaches a predetermined speed from a low speed state, he presses the electronic switch 436 and couples the clutch 42 to the power connection of the transmission shaft group 3 and the rotating unit 52, so as to transfer the kinetic energy of the power source 51 to the rotating unit 52, so that the rotating unit 52 starts to rotate. After the rotating unit 52 rotates to a fixed speed, the helicopter can take off.

[0059] The fixed pulley transmission system 200 with buffered start function of the utility model separates the clutch 42 and the pulley device 201 into two independent devices, and only needs to control the clutch 42 by means of electric control hydraulic method before the helicopter takes off, without starting the power source 51 first. In addition, when the helicopter is just started, the clutch 42 can be disconnected from the power connection with the transmission shaft group 3 by the clutch control module 43, which can avoid the problem that the gear box 41 is damaged due to insufficient torque of the rotating unit 52 due to the low speed of the helicopter. Therefore, the utility model has a buffered start function of disconnecting the power connection. When the speed of the power source 51 reaches the predetermined speed from the low speed, the electronic switch 436 is pressed again, and the clutch 42 is coupled to the power connection of the transmission shaft group 3 and the rotating unit 52. During the flight, there is no need to adjust the tension of the belt 24, and the clutch 42 does not need to be actuated again, so the safety is higher.

[0060] See also Fig.14 In addition, the utility model can also be installed in a power generation device. The power generation device is, for example but not limited to, a wind turbine, and includes a rotating unit 52', a generator 53 and the aforementioned pulley transmission system 200. The rotating unit 52' is a blade. The rotating unit 52' is connected to the gear box unit 4. The generator 53 is connected to the first pulley 22.

[0061] The pulley transmission system 200 is connected between the rotating unit 52 ′ and the generator 53 , and is used to transmit the kinetic energy of the rotating unit 52 ′ to the generator 53 .

[0062] When the rotating unit 52 ′ is driven by wind to rotate, the kinetic energy is transmitted to the generator 53 through the pulley transmission system 200 , and the generator 53 converts the kinetic energy of the rotating unit 52 ′ into electrical energy to achieve power generation. Fig.14 The dotted arrow in the figure indicates the direction of kinetic energy transfer.

[0063] The power generation equipment also has a buffer start function that can disconnect the power connection first through the clutch control module 43 to avoid damage to the gearbox 41 due to insufficient torque, or to avoid unstable current that affects the power supply stability of the parallel power grid.

[0064] In summary, the fixed pulley transmission system 200 with a buffered start function of the utility model has a buffered start function of disconnecting the power connection first by separating the clutch 42 and the pulley device 201 into two independent devices, which can avoid damage to the components of the transmission device 202. In addition, the first pulley 22 and the second pulley 23 are fixed to the fixed frame 21, so the belt 24 will not jump off, and the stability is good and the safety is high. Therefore, during the power transmission period, the helicopter or the power generation equipment equipped with the fixed pulley transmission system 200 with a buffered start function of the utility model does not need to adjust the tension of the belt 24, and the clutch 42 does not need to be actuated, which is highly safe. Therefore, the purpose of this utility model can be achieved.

[0065] The above are merely embodiments of the present invention and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims

1. A fixed pulley transmission system with a buffer start function, suitable for transmitting kinetic energy, characterized in that: The fixed pulley transmission system with buffer start function comprises: Pulley device, comprising: The fixing frame has two first openings spaced opposite to each other in a first direction, and two second openings spaced apart from each other in the first direction, wherein the first opening and the second opening are spaced apart from each other in a second direction perpendicular to the first direction, A first pulley, the shaft of which is arranged in the first opening of the fixing frame, A second pulley, the shaft of which is arranged in the second opening of the fixing frame, a belt rotatably mounted on the first pulley and the second pulley, and Two eccentric seat groups are respectively and adjustably arranged in the second opening of the fixing frame and the shafts are arranged on two opposite sides of the second pulley, each of the eccentric seat groups is used to adjust the position of the second pulley in the second direction, and An eccentric seat is provided which can rotate relative to the respective second openings, and the eccentric seat has an eccentric shaft hole which is eccentrically arranged relative to the outer periphery; and A transmission device is connected to the pulley device and includes a transmission shaft group whose rotatable shaft is arranged between the second pulley and the eccentric seat group, and a gear box unit connected to the transmission shaft group, wherein the gear box unit has a clutch for coupling or disengaging the power connection of the transmission shaft group.

2. The fixed pulley transmission system with buffer start function according to claim 1, characterized in that: Each of the eccentric seats also has a plurality of adjustment holes surrounding the respective eccentric shaft holes, and the eccentric seat can be rotated by applying force to at least one of the adjustment holes.

3. The fixed pulley transmission system with buffer start function according to claim 2, characterized in that: Each of the eccentric seats includes a seat body passing through a corresponding second opening, and a flange extending outward from the outer periphery of the seat body and resting against the fixing frame. The eccentric shaft hole passes through the seat body and the flange, and the seat body is formed with the adjustment hole.

4. The fixed pulley transmission system with buffer start function according to claim 1, characterized in that: Each of the eccentric seat groups also has at least one positioning plate used to fix the respective eccentric seat on the fixing frame, and the positioning plate is detachably fixed to the fixing frame.

5. The fixed pulley transmission system with buffer start function according to claim 1, characterized in that: The transmission shaft group is connected between the clutch and the pulley device. The transmission shaft group has a plurality of shafts and a plurality of couplings. Each coupling is connected between two adjacent shafts.

6. The fixed pulley transmission system with buffer start function according to claim 1, characterized in that: The gearbox unit further comprises a gearbox and a clutch control module for controlling the clutch. The clutch is connected between the gearbox and the transmission shaft group. The clutch control module controls the engagement and disengagement of the clutch by hydraulic pressure.

7. The fixed pulley transmission system with buffer start function according to claim 6, characterized in that: The clutch control module has an oil circuit fluidly connected to the clutch, a hydraulic electric pump for transmitting hydraulic oil in the oil circuit, a solenoid valve for controlling the opening or closing of the oil circuit, a regulating valve for adjusting the flow rate of the oil circuit, and an electronic switch for controlling the hydraulic electric pump and the solenoid valve.

8. The fixed pulley transmission system with buffer start function according to claim 7, characterized in that: The clutch control module also has a pressure switch for detecting the pressure of the oil circuit.

9. The fixed pulley transmission system with buffer start function according to claim 6, characterized in that: The clutch is a controllable friction clutch and has a disc plate for coupling the transmission shaft group and the gearbox, and a piston that can movably push the disc plate. The clutch control module is used to inject hydraulic oil into the clutch and push the piston to move, so as to drive the disc plate to disengage from the power connection with the transmission shaft group.

10. The fixed pulley transmission system with buffer start function according to claim 9, characterized in that: The clutch also has a position sensor, which is used to sense the position of the piston.

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