Valve block unit for a marine methanol boiler

Abstract

The application discloses a valve group unit for a marine methanol boiler and relates to the technical field of a valve group unit for a marine methanol fuel boiler. The application adopts a three-way valve to replace a traditional straight-through valve, reduces the number of valves and interfaces, reduces the risk of leakage, and realizes lightweight design of the valve group. The control system is simplified, and the starting time of fuel supply is shortened. The flow regulating valve adopts a combined design of an inserted regulating valve and a shielding rotary disc, utilizes staggered and aligned dynamic and static circular holes, realizes accurate control of the flow, and the valve opening degree can be flexibly adjusted within the range of 0-100%. The valve group design improves the safety, reliability and operation efficiency of the system, and meets the requirements of the marine methanol boiler for high efficiency, safety and accurate control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine methanol fuel boiler valve group unit, in particular to a marine methanol boiler valve group unit. BACKGROUND

[0002] In recent years, methanol valve groups are more applied to marine main engines and generators, but there are few actual supporting in the field of marine boilers. There are also great differences in the fuel flow control logic between the main engine atomizer and the boiler burner. The methanol valve group is still in the research and demonstration stage in the field of boilers. The present application aims to simplify the system composition and control program, and reduce the risk of methanol leakage in the valve group under the premise of ensuring the running flow control, nitrogen replacement and methanol fuel cut-off function. The technical solution adopted by the present application is to replace two straight-through valves with a three-way valve, reduce the number of valves, and delete the automatic leak detection program between the two cut-off valves that are not needed. The safety function and running function are realized by program control valve position, and the methanol fuel is prevented from flowing into the nitrogen pipeline. The methanol fuel boiler valve group unit realizes safety, complete function, high efficiency and light weight. SUMMARY

[0003] In order to overcome the defects of the prior art, the present application provides the following technical scheme: a marine methanol boiler valve group unit, characterized by: a first three-way valve, a second three-way valve, a third three-way valve, a first straight-through valve, a second straight-through valve, a second check valve, a first check valve, a flow regulating valve, a temperature sensor, a first pressure sensor, and a second pressure sensor. The valve group can realize running flow control, nitrogen replacement, and methanol fuel cut-off (i.e. equipment shutdown) function through the logical control of valve position. The nitrogen replacement program from the second three-way valve to the burner pipeline includes opening the second straight-through valve, and nitrogen passing through the first check valve, the second three-way valve and the flow regulating valve in sequence to realize the nitrogen replacement from the second three-way valve to the burner pipeline. The first straight-through valve located at the front end of the methanol supply is closed, and nitrogen cannot pass through the third three-way valve and the second check valve to the front pipeline of the first three-way valve when the first three-way valve is in the fuel cut-off position. The first three-way valve front-end nitrogen replacement program includes opening the first straight-through valve and the second straight-through valve, and nitrogen passing through the second straight-through valve, the third three-way valve, the second check valve and the first straight-through valve in sequence to realize the first three-way valve front-end nitrogen replacement. The opening degree of the flow regulating valve is 0, and nitrogen cannot pass through the first check valve, the second three-way valve and the flow regulating valve to the second three-way valve rear to the burner pipeline section.

[0004] Preferably, the valve group running program includes: closing the first straight-through valve and the second straight-through valve for nitrogen replacement control, and switching the third three-way valve to the nitrogen dispersion position; switching the fuel pipeline first three-way valve and the second three-way valve to the fuel flow-through position, and realizing flow control by controlling the opening degree of the flow regulating valve, while the second pressure sensor is used to monitor whether the methanol pressure before the burner meets the requirements.

[0005] Preferably, the valve group shutdown state is that the first three-way valve and the second three-way valve are switched to the fuel cut-off position, wherein the valve position of the first three-way valve realizes the release of the methanol pressure between the valves, and the valve position of the second three-way valve is ready for nitrogen replacement from the valve to the combustor section.

[0006] Preferably, the temperature sensor and the first pressure sensor are used to determine whether the inlet fuel temperature and pressure meet the valve group start condition; the first three-way valve and the second three-way valve are used for methanol fuel double cut-off, taking into account the methanol pressure release between the valves and the nitrogen purge; the second check valve and the first check valve are used to prevent methanol fuel from flowing into the nitrogen pipeline; the third three-way valve is used for function switching of nitrogen purge and nitrogen release; and the second straight-through valve is used to start and shut down the nitrogen source.

[0007] Preferably, the flow regulating valve comprises a regulating channel pipe, a control chamber is fixed on the outer surface of the regulating channel pipe along the radial direction thereof, the control chamber is in communication with the inside of the regulating channel pipe, an insertion regulating valve is slidingly and sealingly arranged in the control chamber, the insertion regulating valve is in contact and sealing fit with the inner wall of the regulating channel pipe; the inside of the insertion regulating valve is hollow, a shielding rotary disc is rotatably arranged in the insertion regulating valve, a plurality of dynamic circular holes are formed in the shielding rotary disc, a plurality of static circular holes are formed in the insertion regulating valve, the positions of the dynamic circular holes and the static circular holes are staggered and aligned to control the opening degree of the flow regulating valve, and the plugging area of the insertion regulating valve in the regulating channel pipe is used to control the opening degree of the flow regulating valve.

[0008] Preferably, an adjusting execution gear, a worm gear and a worm are rotatably arranged on the inner wall of the insertion regulating valve, the adjusting execution gear and the worm gear are connected through a second transmission belt, the worm gear and the worm are in meshing transmission, the circumferential surface of the shielding rotary disc is provided with a tooth shape capable of meshing with the adjusting execution gear, a sealing cover plate is fixed and sealed on the top of the insertion regulating valve, and a hexagonal shaft is rotatably arranged on the sealing cover plate and is in fixed synchronous transmission with the worm.

[0009] Preferably, a driving chamber is fixed and sealed on the top of the control chamber, a top cover plate and a bottom cover plate are fixed on the inner wall of the driving chamber, two threaded transmission pulleys are rotatably arranged between the opposite surfaces of the top cover plate and the bottom cover plate, an adjusting screw is threadedly and transmissionally arranged at the axial center of each threaded transmission pulley, the two adjusting screws are arranged in parallel, the bottom ends of the two adjusting screws are fixedly matched with the insertion regulating valve and the sealing cover plate, and the two threaded transmission pulleys are synchronously and transmissionally connected through a first transmission belt.

[0010] Preferably, a driving gear disc is fixed on one of the threaded transmission pulleys and is rotatably matched with the top cover plate and the adjusting screw; and a spline sleeve shaft is slidingly sleeved on the outer surface of the hexagonal shaft in the form of spline, and the spline sleeve shaft is rotatably matched with the top cover plate and the bottom cover plate.

[0011] Preferably, the top of the driving chamber is fixed with a first adjusting motor, the output shaft of the first adjusting motor is fixedly matched with the top end of the spline sleeve shaft, and a second adjusting motor is further fixed on the inner wall of the driving chamber, the output shaft of the second adjusting motor is fixed with a driving gear, and the driving gear is in meshing transmission with the driving gear plate.

[0012] Compared with the prior art, the present application has the following advantages: (1) The present application replaces the traditional straight-through valve with a three-way valve, and the number of valves in the valve group unit is reduced by not less than three. This design significantly reduces the number of valve interfaces, thereby reducing the potential risk of leakage. The reduction in the number of interfaces means a reduction in the number of sealing points, thereby improving the overall safety of the system; (2) The present application optimizes the design of the valve group, reduces the number of valves and actuators, and significantly reduces the volume and weight of the valve group. Lightweight design not only saves installation space, but also helps to reduce manufacturing and maintenance costs. In the limited space of a ship, the saved space can be used for the installation of other key equipment, improving the overall performance and economic benefit of the ship; (3) The present application simplifies the program control system, which greatly shortens the start-up time of fuel supply, enabling the equipment to enter the working state more quickly; (4) The flow regulating valve of the present application adopts a combined design of plug-in regulating petals and shielding rotary discs, and through the staggering and alignment of dynamic and static circular holes, precise control of flow is achieved. The valve opening can be flexibly adjusted within the range of 0-100%, meeting the demand for flow under different working conditions; (5) Due to the reduction in the number of valves and interfaces, the complexity of the system is reduced, and the maintenance work becomes more convenient. Fewer components and interfaces mean fewer failure points, reducing the failure rate of the equipment. The simplification of maintenance work not only saves labor and time costs, but also improves the reliability and usability of the system, ensuring the continuity and safety of ship operation. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A schematic diagram of the valve group unit for the methanol boiler of the present application.

[0014] Figure 2 A schematic diagram of the overall structure of the flow regulating valve of the present application.

[0015] Figure 3 A schematic diagram of the regulating channel pipe structure of the present application.

[0016] Figure 4 A schematic diagram of the structure of the present application Figure 3 A schematic diagram of the structure of the present application

[0017] Figure 5 A schematic diagram of the structure of the present application

[0018] Figure 6 A schematic diagram of the structure of the present application Figure 5Structure diagram of the insertion adjusting valve.

[0019] Figure 7 Structure diagram of the insertion adjusting valve.

[0020] Figure 8 Structure diagram of the insertion adjusting valve.

[0021] In the figure: 1-flow regulating valve; 101-regulating channel pipe; 102-control chamber; 103-driving chamber; 104-first regulating motor; 105-fluted sleeve shaft; 106-second regulating motor; 107-driving toothed disc; 108-driving gear; 109-top cover plate; 110-bottom cover plate; 111-regulating screw rod; 112-insertion adjusting valve; 113-first transmission belt; 114-threaded transmission pulley; 115-six-prism rod shaft; 116-shielding rotary disc; 117-moving circular hole; 118-stationary circular hole; 119-regulating execution gear; 120-second transmission belt; 121-sealing cover plate; 122-worm; 123-worm wheel; 2-temperature sensor; 3-first pressure sensor; 4-first three-way valve; 5-second three-way valve; 6-first straight-through valve; 7-second pressure sensor; 8-second check valve; 9-first check valve; 10-third three-way valve; 11-second straight-through valve. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be further described below in combination with the accompanying drawings. Figures 1-8 The technical solutions of the present application will be further described below in combination with the accompanying drawings.

[0023] The present application provides a valve group unit for a marine methanol boiler, including a first three-way valve 4, a second three-way valve 5, a third three-way valve 10, a first straight-through valve 6, a second straight-through valve 11, a second check valve 8, a first check valve 9, a flow regulating valve 1, a temperature sensor 2, a first pressure sensor 3, and a second pressure sensor 7. The valve group can realize operation flow control, nitrogen replacement, and methanol fuel cut-off (i.e. equipment shutdown) functions through logical control of valve positions.

[0024] The nitrogen replacement procedure of the second three-way valve 5 to the burner pipeline includes opening the second straight-through valve 11, and nitrogen sequentially passing through the first check valve 9, the second three-way valve 5, and the flow regulating valve 1 to realize nitrogen replacement of the second three-way valve 5 to the burner pipeline. The first straight-through valve 6 located at the front end of the methanol supply is closed, and the first three-way valve 4 is in the fuel cut-off position, so nitrogen cannot pass through the third three-way valve 10 and the second check valve 8 to the front end pipeline of the first three-way valve 4.

[0025] The first three-way valve 4 front section nitrogen replacement procedure includes opening the first straight-through valve 6 and the second straight-through valve 11, the first three-way valve 4 being in the fuel cut-off position, nitrogen passing through the second straight-through valve 11, the third three-way valve 10, the second check valve 8 and the first straight-through valve 6 in sequence to realize the first three-way valve 4 front section nitrogen replacement; the flow regulating valve 1 opening degree is 0, nitrogen cannot pass through the first check valve 9, the second three-way valve 5 and the flow regulating valve 1 to the second three-way valve 5 rear to the combustor pipe section.

[0026] The valve group operation procedure includes closing the first straight-through valve 6 and the second straight-through valve 11 for nitrogen replacement, and switching the third three-way valve 10 to the nitrogen release position; the fuel pipeline first three-way valve 4 and the second three-way valve 5 are switched to the fuel flow-through position, flow control is realized by controlling the flow regulating valve 1 opening degree, and the second pressure sensor 7 is used to monitor whether the methanol pressure before the combustor meets the requirements.

[0027] The valve group shutdown state is that the first three-way valve 4 and the second three-way valve 5 are switched to the fuel cut-off position, wherein the valve position of the first three-way valve 4 realizes the discharge of the methanol pressure between the two valves, and the valve position of the second three-way valve 5 is ready for nitrogen replacement from the valve rear to the combustor section.

[0028] The temperature sensor 2 and the first pressure sensor 3 are used to determine whether the inlet fuel temperature and pressure meet the valve group start-up conditions; the first three-way valve 4 and the second three-way valve 5 are used for methanol fuel double cut-off, taking into account the methanol pressure discharge between the valves and nitrogen purging; the second check valve 8 and the first check valve 9 are used to prevent methanol fuel from flowing to the nitrogen pipeline; the third three-way valve 10 is used for function switching of nitrogen purging and nitrogen release; the second straight-through valve 11 is used to start and close the nitrogen source.

[0029] The flow regulating valve 1 comprises a regulating channel pipe 101, a control chamber 102 is fixed on the outer surface of the regulating channel pipe 101 along the radial direction of the regulating channel pipe 101, the control chamber 102 is in communication with the inside of the regulating channel pipe 101, an insertion regulating valve 112 is slidingly arranged in the control chamber 102, the insertion regulating valve 112 is in sealing contact with the inner wall of the regulating channel pipe 101, the inside of the insertion regulating valve 112 is hollow, a shielding rotary disc 116 is rotatably arranged in the insertion regulating valve 112, a plurality of dynamic circular holes 117 are formed in the shielding rotary disc 116, a plurality of static circular holes 118 are formed in the insertion regulating valve 112, the positions of the dynamic circular holes 117 and the static circular holes 118 are staggered and aligned to control the opening degree of the flow regulating valve 1, the plugging area of the insertion regulating valve 112 in the regulating channel pipe 101 is used to control the opening degree of the flow regulating valve 1, an adjusting execution gear 119, a worm wheel 123 and a worm 122 are rotatably arranged on the inner wall of the insertion regulating valve 112, the adjusting execution gear 119 is in transmission connection with the worm wheel 123 through a second transmission belt 120, the worm wheel 123 is in meshing transmission with the worm 122, the circumferential surface of the shielding rotary disc 116 is provided with a tooth profile capable of meshing with the adjusting execution gear 119, a sealing cover plate 121 is fixedly and sealingly arranged on the top of the insertion regulating valve 112, a hexagonal shaft 115 in fixed and synchronous transmission with the worm 122 is rotatably arranged on the sealing cover plate 121, a driving chamber 103 is fixedly and sealingly arranged on the top of the control chamber 102, a top cover plate 109 and a bottom cover plate 110 are fixedly arranged on the inner wall of the driving chamber 103, two threaded transmission pulleys 114 are rotatably arranged between the opposite surfaces of the top cover plate 109 and the bottom cover plate 110, an adjusting screw 111 is threadedly arranged at the axial center of each threaded transmission pulley 114, the two adjusting screws 111 are arranged in parallel, the bottom ends of the two adjusting screws 111 are fixedly connected with the insertion regulating valve 112 and the sealing cover plate 121, the two threaded transmission pulleys 114 are in synchronous transmission connection through a first transmission belt 113, a driving gear disc 107 is fixedly arranged on one of the threaded transmission pulleys 114, the driving gear disc 107 is rotatably connected with the top cover plate 109 and the adjusting screw 111, a spline sleeve shaft 105 is slidingly arranged on the outer surface of the hexagonal shaft 115 in the form of spline, the spline sleeve shaft 105 is rotatably connected with the top cover plate 109 and the bottom cover plate 110, a first adjusting motor 104 is fixedly arranged on the top of the driving chamber 103, the output shaft of the first adjusting motor 104 is fixedly connected with the top end of the spline sleeve shaft 105, a second adjusting motor 106 is fixedly arranged on the inner wall of the driving chamber 103, a driving gear 108 is fixedly arranged on the output shaft of the second adjusting motor 106, the driving gear 108 is in meshing transmission with the driving gear disc 107.

[0030] The three-way valve is used to replace the straight-through valve, the number of valves in the valve group unit is reduced by no less than three, the number of valve interfaces is reduced, the leakage risk is reduced, and the lightweight design of the valve group unit is also achieved; the automatic leak detection program in the double-stop breather valve is deleted, the program control system is simplified, and the fuel supply start-up time is shortened; the valve group uses the three-way valve to replace two straight-through valves, which reduces the number of valves, reduces the number of execution structures, control mechanisms, and valve interfaces, reduces the size of the valve group, reduces the weight of the unit, and reduces the methanol leakage risk point.

[0031] The first adjusting motor 104 is controlled, the output shaft of the first adjusting motor 104 drives the spline sleeve shaft 105 to rotate, the spline sleeve shaft 105 drives the six-prism rod shaft 115 to rotate, the six-prism rod shaft 115 drives the worm 122 to rotate, the worm 122 drives the worm gear 123 to rotate, the worm gear 123 rotates through the second transmission belt 120 to drive the adjusting execution gear 119 to rotate, the adjusting execution gear 119 drives the shielding rotary disc 116 to rotate, at this time the dynamic circular hole 117 and the static circular hole 118 will be staggered or aligned, the area of the dynamic circular hole 117 and the static circular hole 118 can be controlled by the rotation angle of the output shaft of the first adjusting motor 104, thereby controlling the flow of the fluid, and the opening of the flow regulating valve 1 is also controlled. The second adjusting motor 106 is controlled, the output shaft of the second adjusting motor 106 drives the drive gear 108 to rotate, the drive gear 108 drives the drive gear disc 107 to rotate, the drive gear disc 107 drives one of the threaded transmission pulleys 114 to rotate, the two threaded transmission pulleys 114 will rotate synchronously through the first transmission belt 113, at this time the threaded transmission pulley 114 will drive the adjusting screw 111 which is in threaded transmission cooperation to move linearly along its axial direction, the movement of the adjusting screw 111 will drive the insertion adjusting petal 112 to move, so that the insertion adjusting petal 112 is separated from or inserted into the inside of the adjusting channel pipe 101, thereby changing the cross-sectional area of the fluid flowing in the adjusting channel pipe 101, and further controlling the opening of the flow regulating valve 1, wherein the size of the area of the dynamic circular hole 117 and the static circular hole 118 can be controlled more accurately to control the flow of the fluid, and by controlling the movement of the insertion adjusting petal 112 in the adjusting channel pipe 101, the fluid can be more quickly passed through the adjusting channel pipe 101 (such as completely opened or completely closed), therefore through the coordination of the two, more accurate flow control (such as the opening of the flow regulating valve 1 is 0-100%) can be achieved.

Claims

1. A valve block unit for a marine methanol boiler, characterized by: The first three-way valve (4), the second three-way valve (5), the third three-way valve (10), the first straight-through valve (6), the second straight-through valve (11), the second check valve (8), the first check valve (9), the flow regulating valve (1), the temperature sensor (2), the first pressure sensor (3), and the second pressure sensor (7); the valve group can realize the functions of operating flow control, nitrogen replacement, methanol fuel cut-off, and equipment shutdown through the logical control of valve positions; The nitrogen replacement program of the second three-way valve (5) to the burner pipeline comprises: opening the second straight-through valve (11), and making nitrogen pass through the first check valve (9), the second three-way valve (5), and the flow regulating valve (1) in sequence to realize the nitrogen replacement of the second three-way valve (5) to the burner pipeline; the first straight-through valve (6) located at the front end of the methanol supply is closed, and nitrogen cannot pass through the third three-way valve (10) and the second check valve (8) to the front pipeline of the first three-way valve (4) when the first three-way valve (4) is in the fuel cut-off position; The first three-way valve (4) front section nitrogen replacement program comprises: opening the first straight-through valve (6) and the second straight-through valve (11), and making nitrogen pass through the second straight-through valve (11), the third three-way valve (10), the second check valve (8), and the first straight-through valve (6) in sequence to realize the first three-way valve (4) front section nitrogen replacement when the first three-way valve (4) is in the fuel cut-off position; the opening degree of the flow regulating valve (1) is 0, and nitrogen cannot pass through the first check valve (9), the second three-way valve (5), and the flow regulating valve (1) to the second three-way valve (5) back to the burner pipeline section; The flow regulating valve (1) comprises a regulating channel pipe (101), a control chamber (102) is fixed on the outer surface of the regulating channel pipe (101) along the radial direction of the regulating channel pipe (101), the control chamber (102) is in communication with the inside of the regulating channel pipe (101), an insertion regulating valve (112) is sealingly arranged in the control chamber (102), the insertion regulating valve (112) is in sealing contact with the inner wall of the regulating channel pipe (101), the inside of the insertion regulating valve (112) is hollow, a shielding rotary disc (116) is rotatably arranged in the insertion regulating valve (112), a plurality of dynamic circular holes (117) are formed in the shielding rotary disc (116), a plurality of static circular holes (118) are formed in the insertion regulating valve (112), the positions of the dynamic circular holes (117) and the static circular holes (118) are staggered and aligned, and the opening degree of the flow regulating valve (1) is controlled, the plugging area of the insertion regulating valve (112) in the regulating channel pipe (101) is used to control the opening degree of the flow regulating valve (1), an adjusting execution gear (119), a worm wheel (123) and a worm (122) are rotatably arranged on the inner wall of the insertion regulating valve (112), the adjusting execution gear (119) and the worm wheel (123) are drivingly connected through a second transmission belt (120), the worm wheel (123) and the worm (122) are in meshing transmission, the circumferential surface of the shielding rotary disc (116) is provided with a tooth profile capable of meshing with the adjusting execution gear (119), a sealing cover plate (121) is sealingly fixed on the top of the insertion regulating valve (112), a hexagonal column shaft (115) is rotatably arranged on the sealing cover plate (121) and drivingly connected with the worm (122), a driving chamber (103) is sealingly fixed on the top of the control chamber (102), a top cover plate (109) and a bottom cover plate (110) are fixedly arranged on the inner wall of the driving chamber (103), two threaded transmission pulleys (114) are rotatably arranged between the opposite surfaces of the top cover plate (109) and the bottom cover plate (110), an adjusting screw (111) is threadedly arranged at the axial center of each threaded transmission pulley (114), the two adjusting screws (111) are arranged in parallel, and the bottom ends of the two adjusting screws (111) are fixedly connected with the insertion regulating valve (112) and the sealing cover plate (121), and the two threaded transmission pulleys (114) are synchronously drivingly connected through a first transmission belt (113).

2. A valve block unit for a marine methanol boiler according to claim 1, characterized in that: The valve group operation program comprises that the first straight-through valve (6) and the second straight-through valve (11) for controlling nitrogen replacement are closed, the third three-way valve (10) is switched to a nitrogen release position, the first three-way valve (4) and the second three-way valve (5) of the fuel pipeline are switched to fuel flow-through positions, the flow control is realized by controlling the opening degree of the flow regulating valve (1), and the second pressure sensor (7) is used for monitoring whether the methanol pressure before entering the burner meets the requirements.

3. A valve block unit for a marine methanol boiler according to claim 2, characterized in that: The valve group stop state is that the first three-way valve (4) and the second three-way valve (5) are switched to the fuel cut-off position, wherein the valve position of the first three-way valve (4) realizes the release of the methanol pressure between the two valves, and the valve position of the second three-way valve (5) is ready for nitrogen replacement from the valve to the burner section.

4. A valve block unit for a marine methanol boiler according to claim 3, characterized in that: The temperature sensor (2) and the first pressure sensor (3) are used to determine whether the inlet fuel temperature and pressure meet the valve group start condition; the first three-way valve (4) and the second three-way valve (5) are used for methanol fuel double cut-off, and the methanol pressure release and nitrogen blowing between the valves are considered; the second check valve (8) and the first check valve (9) are used to prevent methanol fuel from flowing into the nitrogen pipeline; the third three-way valve (10) is used for function switching of nitrogen blowing and nitrogen diffusion; and the second straight-through valve (11) is used for starting and closing the nitrogen gas source.

5. A valve block unit for a marine methanol boiler according to claim 4, characterized in that: One of the threaded drive pulleys (114) is fixed with a driving gear disc (107), and the driving gear disc (107) is in rotational cooperation with the top cover plate (109) and the adjusting screw rod (111); the outer surface of the six-prism rod shaft (115) is slidably sleeved with a spline sleeve shaft (105) in the form of spline, and the spline sleeve shaft (105) is in rotational cooperation with the top cover plate (109) and the bottom cover plate (110).

6. A valve block unit for a marine methanol boiler according to claim 5, characterized in that: The top of the driving chamber (103) is fixed with a first adjusting motor (104), the output shaft of the first adjusting motor (104) is in fixed cooperation with the top end of the spline sleeve shaft (105), and the inner wall of the driving chamber (103) is further fixed with a second adjusting motor (106), the output shaft of the second adjusting motor (106) is fixed with a driving gear (108), and the driving gear (108) is in meshing transmission with the driving gear disc (107).

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