New pneumatic winch far and near double control safety operation control method

Abstract

A novel pneumatic winch dual-control safety operation method includes a first hand-operated valve, a first pneumatic control valve, a second pneumatic control valve, a third pneumatic control valve, a fourth pneumatic control valve, a first one-way valve, a one-way throttle valve, and a quick-release valve. The control air circuit of the personnel-carrying pneumatic winch described in this invention includes a basic control air circuit and a safety protection air circuit. The safety protection air circuit mainly includes an emergency stop protection air circuit, a travel limit protection air circuit, a slack rope protection air circuit, an overload protection air circuit, an air cut-off braking protection air circuit, and an emergency release protection air circuit. When the above safety protection air circuits are activated, they can all ensure that the winch stops and brakes quickly, with high reliability, maximizing the safety of people and property on the pneumatic winch. It is simple to operate, precise to control, reliable to run, energy-saving and environmentally friendly.

Description

Technical Field

[0001] This invention relates to a control air circuit and control method, and more specifically, to a novel pneumatic winch remote and local dual-control safety operation control method. Background Technology

[0002] A winch, also known as a hoist, is a small, lightweight lifting device that uses a drum to wind a steel wire rope to lift or pull heavy objects. It is a common piece of machinery in industrial production processes. Based on the driving method, winches are generally classified into electric winches, pneumatic winches, and hydraulic winches. In recent years, with the rapid development of China's offshore oil industry, in addition to CNOOC, CNPC and Sinopec have also begun to enter the offshore oil field. It is estimated that in the future, offshore oil production will account for one-third of the country's total oil and gas production. As a key transportation device for offshore drilling platforms, manned pneumatic winches have a broad market prospect. However, this market has long been monopolized by foreign companies, and domestic research on manned pneumatic winches is almost non-existent. Summary of the Invention

[0003] The purpose of this invention is to provide a novel dual-control safety operation method for pneumatic winches, which can ensure that the winch stops and brakes quickly, has high reliability, maximizes the safety of people and property on the pneumatic winch, is simple to operate, has precise control, is reliable in operation, and is energy-saving and environmentally friendly.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] A novel pneumatic winch dual-control safety operation method includes a first hand-operated valve, a first pneumatic control valve, a second pneumatic control valve, a third pneumatic control valve, a fourth pneumatic control valve, a first one-way valve, a one-way throttle valve, a quick-release valve, a fifth pneumatic control valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, a fourth shuttle valve, a fifth shuttle valve, a sixth shuttle valve, a remote control system, a local control system, a limit protection air circuit, an overload protection air circuit, an emergency release air circuit, and an associated system. The remote control system includes a first button valve, a second button valve, a first emergency stop valve, a seventh shuttle valve, and a first start valve. The local control system includes a manual reversing valve, a second emergency stop valve, an eighth shuttle valve, and a second start valve. The limit protection air circuit includes a mechanical valve, a ninth shuttle valve, a tenth shuttle valve, a first mechanical valve, and a second mechanical valve. The overload protection air circuit includes a sixth pneumatic control valve and a pressure regulating valve. The emergency release air circuit includes a second one-way valve, a second hand-operated valve, an air inlet, and an air tank.

[0006] The associated system includes a compressed air source Y, a winch motor M, a winch air cut-off brake S, and a winch manual auxiliary brake S.

[0007] The main air path of the compressed air source Y is connected to the first hand-operated valve, the second check valve of the emergency release air path, and the third air control valve. The diameter of the main air path connected to the third air control valve, the third air control valve, and the fifth air control valve must be adapted to the maximum air consumption of the motor M.

[0008] One end of the sixth pneumatic control valve is connected to the lifting air path of the motor M through the fourth pneumatic control valve and the first check valve.

[0009] The control method includes the following steps:

[0010] ① Manually control the first hand-pull valve to switch to local control mode. At this time, the control air source has also reached the air control port of the first air control valve. The seventh air control valve has connected the manual reversing valve of the local control system to the outlet of the third air control valve. However, the air inlet of the third air control valve is still closed, and the winch cannot be operated by operating the manual reversing valve.

[0011] ② When the second start valve is pressed, the control air source will pass through the eighth shuttle valve, the second emergency stop valve, the fifth shuttle valve, and the second pneumatic control valve to the pneumatic control port of the third pneumatic control valve, pushing it to switch direction. The main air source reaches its outlet, and then reaches the air inlet of the fifth pneumatic control valve. It then passes through the first pneumatic control valve to the air inlet of the manual reversing valve, simultaneously pushing the eighth shuttle valve to switch direction, blocking and maintaining the exhaust port passage to the already switched and reset second start valve. At this time, operating the manual reversing valve will control the air source to pass through the outlet of the manual reversing valve, the third shuttle valve, or the fourth shuttle valve to the fifth... The two air control ports of the pneumatic control valve are reversed, allowing the main air source compressed air to reach the inlet and outlet ports of the motor M. At the same time, the compressed air from the outlet of the fifth pneumatic control valve passes through the channels of the second shuttle valve, the third shuttle valve, and the quick exhaust valve to the air cut-off braking device S to open the brake, realizing the forward or reverse operation of the motor. When the manual reversing valve returns to the neutral position, since both the manual reversing valve and the fifth pneumatic control valve are neutral leakage functions, the two inlet and outlet ports of the motor M release air and stop operation. At the same time, the control air circuit of the air cut-off braking device S is also connected to the atmosphere and quickly exhausts air through the quick exhaust valve to implement braking.

[0012] It also includes the following steps:

[0013] ③ In case of an emergency during operation, if the manual reversing valve is stuck and cannot return to the neutral position, quickly press the second emergency stop valve. The air control port of the third air control valve will release air pressure through the second air control valve, the fifth shuttle valve and the second emergency stop valve. The reversing of the third air control valve will be interrupted, supplying air to the manual reversing valve and the fifth air control valve and venting the air. The winch will stop running. At the same time, the control air circuit of the air cut-off braking device S will also quickly vent the air and apply the brake to ensure the safety of the operation.

[0014] It also includes the following steps:

[0015] ④ When the first hand-operated valve's air circuit is connected to the remote control system, the air control port of the first pneumatic control valve is in a zero-pressure, atmospheric-vented state, and the seventh pneumatic control valve is normally open. The air inlets of the first and second button valves of the remote control system are connected to the outlet of the third pneumatic control valve. However, the air inlet of the third pneumatic control valve is still closed, making it impossible to control the winch operation by operating the first and second button valves. When the first start valve is pressed, the control air source will pass through the seventh shuttle valve, the first emergency stop valve, the fifth shuttle valve, and the second pneumatic control valve to reach the air control port of the third pneumatic control valve, pushing it to switch directions. The main air source reaches its outlet, and then reaches the air inlet of the fifth pneumatic control valve, and then... The air flows through the first pneumatic control valve to the inlet of the first button valve and the second button valve, while simultaneously pushing the seventh shuttle valve to reverse, blocking the exhaust port passage to the first start valve that has been reversed and reset, and maintaining this blockage. At this time, pressing the first button valve or the second button valve controls the air source to flow through the outlet of the first button valve or the second button valve, the third shuttle valve or the fourth shuttle valve to the two pneumatic control ports of the fifth pneumatic control valve to reverse its direction, so that the main air source compressed air reaches the inlet and outlet ports of the motor M. At the same time, the compressed air at the outlet of the fifth pneumatic control valve flows through the passage of the second shuttle valve, the third shuttle valve, and the quick exhaust valve to the air cut-off braking device S to open the brake, thereby realizing the forward or reverse operation of the motor.

[0016] It also includes the following steps:

[0017] ⑤ When neither the first button valve nor the second button valve is pressed, since the air outlets of the first button valve and the second button valve are open to the atmosphere, and the fifth air control valve is in the middle leakage function, the two inlet and outlet ports of the motor M leak air and stop running. At the same time, the control air circuit of the air cut-off braking device S is also connected to the atmosphere and brakes by quickly venting air through the quick exhaust valve.

[0018] It also includes the following steps:

[0019] ⑥ In case of an emergency during operation, if the first and second button valves become stuck and cannot be reset, quickly press the first emergency stop valve. The air control port of the third pneumatic control valve will release air pressure through the second pneumatic control valve, the fifth shuttle valve, and the first emergency stop valve. The third pneumatic control valve will switch off and stop supplying air to the first, second, and fifth button valves and venting the air. The winch will stop operating. At the same time, the control air circuit of the air cut-off braking device S will also quickly vent air and apply braking. The function of the third, fourth, and fifth shuttle valves in the air circuit is to slide the shuttle valves to the non-operating system end when operating the remote control system or the local control system, so that the operation of the remote control system and the local control system do not affect each other and ensure their independent operation is normal and safe.

[0020] The advantages of this invention are as follows: The pneumatic winch control circuit of this invention includes a basic control circuit and a safety protection circuit. The safety protection circuit mainly includes an emergency stop protection circuit, a travel limit protection circuit, a slack rope protection circuit, an overload protection circuit, an air cut-off braking protection circuit, and an emergency release protection circuit. When the above safety protection circuits are activated, they can all ensure that the winch stops and brakes quickly, with high reliability, maximizing the safety of people and property on the pneumatic winch. It is simple to operate, precise to control, reliable to run, energy-saving and environmentally friendly. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the manual switching pneumatic control principle of the present invention;

[0023] Figure 2 This is a schematic diagram of the automatic switching pneumatic control principle of the present invention. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] A novel pneumatic winch dual-control safety operation method, such as... Figures 1-2 As shown, the system includes a first hand-operated valve 01, a first pneumatic control valve 02, a second pneumatic control valve 03, a third pneumatic control valve 04, a fourth pneumatic control valve 05, a first one-way valve 06, a one-way throttle valve 07, a quick-release valve 08, a fifth pneumatic control valve 09, a first shuttle valve 10, a second shuttle valve 11, a third shuttle valve 12, a fourth shuttle valve 13, a fifth shuttle valve 14, a sixth shuttle valve 15, a remote control system 20, a local control system 30, a limit protection air circuit 40, an overload protection air circuit 50, an emergency release air circuit 60, and an associated system. The remote control system 20 includes a push-button valve 2. 1. The local control system 30 includes a second button valve 22, an emergency stop valve 23, a seventh shuttle valve 24, and a first start valve 25. The local control system 30 includes a manual reversing valve 31, a second emergency stop valve 32, a shuttle valve 33, and a second start valve 34. The limit protection air circuit 40 includes a mechanical valve 41, a ninth shuttle valve 42, a tenth shuttle valve 43, a first mechanical valve 44, and a second mechanical valve 45. The overload protection air circuit 50 includes a sixth pneumatic control valve 51 and a pressure regulating valve 52. The emergency release air circuit 60 includes a second check valve 61, a second hand-operated valve 62, an air filling nozzle 63, and an air storage tank 64.

[0026] The associated system includes a compressed air source Y, a winch motor M, a winch air cut-off brake S, and a winch manual auxiliary brake S1.

[0027] The main air path of the compressed air source Y is connected to the first hand-operated valve 01, the second check valve 61 of the emergency release air path 60, and the third air control valve 04. The diameter of the main air path connected to the third air control valve 04, the third air control valve 04, and the fifth air control valve 09 must be adapted to the maximum air consumption of the motor M.

[0028] One end of the sixth pneumatic control valve 51 is connected to the lifting air path of the motor M through the fourth pneumatic control valve 05 and the first one-way valve 06.

[0029] Includes the following steps:

[0030] ① Manually control the first hand-operated valve 01 to switch to local control mode. At this time, the control air source has also reached the air control port of the first air control valve 02. The air control valve 2 has connected the manual reversing valve 31 of the local control system 30 to the outlet of the third air control valve 04. However, the air inlet of the third air control valve 04 is still closed, and the winch cannot be operated by operating the manual reversing valve 31.

[0031] ② When the second start valve 34 is pressed, the control air source will pass through the shuttle valve 33, the second emergency stop valve 32, the fifth shuttle valve 14, and the second pneumatic control valve 03 to the pneumatic control port of the third pneumatic control valve 04, pushing it to switch direction. The main air source reaches its outlet, and then reaches the air inlet of the fifth pneumatic control valve 09. It also reaches the air inlet of the manual reversing valve 31 through the first pneumatic control valve 02. At the same time, it pushes the shuttle valve 33 to switch direction, blocking the exhaust port passage to the second start valve 34, which has been switched and reset, and maintaining this state. At this time, the manual reversing valve 31 is operated, and the control air source passes through the air outlet of the manual reversing valve 31, the third shuttle valve 12, or the fourth shuttle valve 1. The two air control ports of the fifth air control valve 09 are reversed, allowing the main air source compressed air to reach the inlet and outlet ports of the motor M. At the same time, the compressed air at the outlet of the fifth air control valve 09 passes through the channels of the second shuttle valve 11, the third shuttle valve 12, and the quick exhaust valve 08 to the air cut-off braking device S to open the brake, realizing the forward or reverse operation of the motor. When the manual reversing valve 31 returns to the neutral position, since both the manual reversing valve 31 and the fifth air control valve 09 are neutral leakage functions, the two inlet and outlet ports of the motor M are leaked and stop operating. At the same time, the control air circuit of the air cut-off braking device S is also connected to the atmosphere and the brake is applied by quickly exhausting air through the quick exhaust valve 08.

[0032] It also includes the following steps:

[0033] ③ In case of an emergency during operation, if the manual reversing valve 31 is stuck and cannot return to the neutral position, quickly press down the second emergency stop valve 32. The air control port of the third air control valve 04 will release air pressure through the second air control valve 03, the fifth shuttle valve 14 and the second emergency stop valve 32. The reversing of the third air control valve 04 will interrupt the supply of air to the manual reversing valve 31 and the fifth air control valve 09 and vent the air. The winch will stop running. At the same time, the control air circuit of the air cut-off braking device S will also quickly vent the air and apply the brake to ensure the safety of the operation.

[0034] It also includes the following steps:

[0035] ④ When the air circuit of the first hand-operated valve 01 is connected to the remote control system 20, the air control port of the first air control valve 02 is in a zero-pressure, atmospheric-vented state, and the air control valve 2 is normally open. The air inlets of the remote control system 20's button valve 21 and second button valve 22 are connected to the outlet of the third air control valve 04. However, the air inlet of the third air control valve 04 is still closed, making it impossible to control the winch operation by operating button valve 21 and second button valve 22. When the first start valve 25 is pressed, the control air source will pass through the seventh shuttle valve 24, emergency stop valve 23, fifth shuttle valve 14, and second air control valve 03 to reach the air control port of the third air control valve 04, pushing it to switch directions. The main air source reaches its outlet, and then reaches the air inlet of the fifth air control valve 09, and then... The air flows through the first pneumatic control valve 02 to the inlet of the button valve 21 and the second button valve 22, while simultaneously pushing the seventh shuttle valve 24 to reverse, blocking the exhaust port passage to the first start valve 25 that has been reversed and reset, and maintaining this state. At this time, pressing the button valve 21 or the second button valve 22 controls the air source to flow through the outlet of the button valve 21 or the second button valve 22, the third shuttle valve 12 or the fourth shuttle valve 13 to the two pneumatic control ports of the fifth pneumatic control valve 09 to reverse its direction, so that the main air source compressed air reaches the inlet and outlet ports of the motor M. At the same time, the compressed air at the outlet of the fifth pneumatic control valve 09 flows through the passage of the second shuttle valve 11, the third shuttle valve 12, and the quick exhaust valve 08 to the air cut-off braking device S to open the brake, realizing the forward or reverse operation of the motor.

[0036] It also includes the following steps:

[0037] ⑤ When neither button valve 21 nor the second button valve 22 is pressed, since the air outlets of button valve 21 and the second button valve 22 are open to the atmosphere, and the fifth air control valve 09 is in the middle leakage function, the two inlet and outlet ports of motor M are leaking air and stop running. At the same time, the control air circuit of the air cut-off braking device S is also connected to the atmosphere and brakes by quickly venting air through the quick exhaust valve 08.

[0038] It also includes the following steps:

[0039] ⑤ In case of an emergency during operation, such as when button valve 21 or second button valve 22 becomes stuck and cannot be released, quickly press the emergency stop valve 23. The air control port of the third pneumatic control valve 04 will release air pressure through the second pneumatic control valve 03, the fifth shuttle valve 14, and the emergency stop valve 23. The third pneumatic control valve 04 will then switch off, interrupting the supply of air to button valve 21, second button valve 22, and fifth pneumatic control valve 09 and venting the system. The winch will stop operating. At the same time, the control air circuit of the air-stop braking device S will also quickly vent air and apply braking. The function of the third shuttle valve 12, fourth shuttle valve 13, and fifth shuttle valve 14 in the air circuit is to slide the shuttle valves to the non-operating system end when operating the remote control system 20 or the local control system 30, so that the operation of the remote control system 20 and the local control system 30 does not affect each other, ensuring their independent operation is normal and safe. The new pneumatic winch adopts both manual and automatic switching modes for switching between local and remote control in the dual-control safety operation control air circuit.

[0040] First, the control principle of manual switching mode will be explained. The main air circuit of the compressed air source Y is connected to the first hand-operated valve 01, the second check valve 61 of the emergency release air circuit 60, and the third air control valve 04. The diameter of the main air circuit connected to the third air control valve 04, the third air control valve 04, and the fifth air control valve 09 must be adapted to the maximum air consumption of the motor M. The function of the first manual control valve 01 is to switch between remote and local control. It provides the control air source to the control system that requires the desired control mode. The air path shown in the attached diagram represents the local control mode. At this time, the control air source has reached the air control port of the first pneumatic control valve 02. Pneumatic control valve 2 has connected the manual reversing valve 31 of the local control system 30 to the outlet of the third pneumatic control valve 04, but the air inlet of the third pneumatic control valve 04 is still closed, making it impossible to control the winch operation by operating the manual reversing valve 31. When the second start valve 34 is pressed, the control air source will pass through the shuttle valve 33, the second emergency stop valve 32, the fifth shuttle valve 14, and the second pneumatic control valve 03 to reach the air control port of the third pneumatic control valve 04, pushing it to switch. The main air source reaches its outlet, then to the air inlet of the pneumatic control valve 9, and through the first pneumatic control valve 02 to reach the air inlet of the manual reversing valve 31. Simultaneously, it pushes the shuttle valve 33 to switch, blocking the exhaust passage to the already reset second start valve 34 and maintaining this state. Operate the manual reversing valve 31 to control the air source to switch directions through the outlet of the manual reversing valve 31, the third shuttle valve 12, or the fourth shuttle valve 13 to the two air control ports of the air control valve 9. This allows the main air source compressed air to reach the inlet and outlet ports (one of them must be present) of the motor M. At the same time, the compressed air from the outlet port (one of them must be present) of the air control valve 9 passes through the passage of the second shuttle valve 11, the third shuttle valve 12, and the quick exhaust valve 08 to the air cut-off braking device S to open the brake, realizing the forward or reverse operation of the motor. When the manual reversing valve is activated... When valve 31 returns to the neutral position, since both manual reversing valve 31 and pneumatic control valve 9 have a venting function, the two inlet and outlet ports of motor M vent air and stop operating. At the same time, the control air circuit of the air-stop braking device S is also connected to the atmosphere and quickly vents air through the quick exhaust valve 08 to implement braking. When an emergency occurs during operation, if manual reversing valve 31 is stuck and cannot return to the neutral position, the second emergency stop valve 32 is quickly pressed down. The air control port of the third pneumatic control valve 04 will vent air and release pressure through the second pneumatic control valve 03, the fifth shuttle valve 14 and the second emergency stop valve 32. The reversing of the third pneumatic control valve 04 interrupts the supply of air to manual reversing valve 31 and pneumatic control valve 9 and vents the air. The winch stops operating. At the same time, the control air circuit of the air-stop braking device S also quickly vents air and implements braking to ensure operational safety.When the air circuit of the first hand-operated valve 01 is connected to the remote control system 20, the air control port of the first pneumatic control valve 02 is in a zero-pressure state, and the pneumatic control valve 2 is normally open. It has connected the air inlets of the remote control system 20's button valve 21 and the second button valve 22 to the outlet of the third pneumatic control valve 04. However, the air inlet of the third pneumatic control valve 04 is still closed, and the winch cannot be operated by operating the button valve 21 and the second button valve 22. When the first start valve 25 is pressed, the control air source will pass through the seventh shuttle valve 24, the emergency stop valve 23, the fifth shuttle valve 14, and the second pneumatic control valve 03. The air supply reaches the air control port of the third air control valve 04, pushing it to switch direction. The main air source reaches its outlet, and then reaches the air inlet of the air control valve 9. It then passes through the first air control valve 02 to the air inlets of the push-button valve 21 and the second push-button valve 22. At the same time, it pushes the seventh shuttle valve 24 to switch direction, blocking and maintaining the exhaust passage to the first start valve 25, which has been switched and reset. At this time, pressing the push-button valve 21 or the second push-button valve 22 controls the air source to switch direction through the air outlet of the push-button valve 21 or the second push-button valve 22, the third shuttle valve 12 or the fourth shuttle valve 13 to the two air control ports of the air control valve 9. This allows compressed air from the main air source to reach either the inlet or outlet of motor M (one of these ports is mandatory). Simultaneously, compressed air from the outlet of pneumatic control valve 9 (one of these ports is mandatory) passes through the channels of second shuttle valve 11, third shuttle valve 12, and quick exhaust valve 08 to the air-stop braking device S, opening the brake and enabling the motor to operate in either the forward or reverse direction. When neither button valve 21 nor the second button valve 22 is pressed, since the outlets of button valve 21 and the second button valve 22 are open to the atmosphere, and pneumatic control valve 9 is in its middle-leakage function, the two inlet and outlet ports of motor M release air and stop operating. At the same time, the air-stop braking device... The control air circuit of S is also connected to the atmosphere and quickly exhausts air through the quick exhaust valve 08 to implement braking. In case of an emergency during operation, such as when the button valve 21 or the second button valve 22 is stuck and cannot be released, the emergency stop valve 23 is quickly pressed. The air control port of the third air control valve 04 will exhaust and release pressure through the second air control valve 03, the fifth shuttle valve 14 and the emergency stop valve 23. The third air control valve 04 reverses and interrupts the supply of air to the button valve 21, the second button valve 22 and the air control valve 9 and empties the system, stopping the winch. At the same time, the control air circuit of the air-stop braking device S also quickly exhausts air and implements braking. The function of the third shuttle valve 12, the fourth shuttle valve 13 and the fifth shuttle valve 14 in the air circuit is to slide the shuttle valves to the non-operational end when operating the remote control system 20 or the local control system 30, so that the operation of the remote control system 20 and the local control system 30 does not affect each other, ensuring their independent operation is normal and safe.

[0041] Whether operating using the remote control system 20 or the local control system 30, after activating the emergency stop protection procedure, normal operation can only resume after the emergency situation is resolved and the start button 25 of the remote control system 20 or the start button 34 of the local control system 30 is pressed again.

[0042] The control air source of the slack-rope protection mechanical valve 41 and the lower limit or local limit first mechanical valve 44 of the limit protection air circuit 40 is connected to the lowering air circuit of the pneumatic motor, and the control air source of the upper limit or remote limit second mechanical valve 45 is connected to the lifting air circuit of the pneumatic motor. When the slack-rope protection mechanical valve 41, the lower limit or local limit first mechanical valve 44, and the upper limit or remote limit second mechanical valve 45 are triggered, the control air source is switched through the ninth shuttle valve 42 or the tenth shuttle valve 43 and the ninth shuttle valve 42, the sixth shuttle valve 15 to the pneumatic control end of the second pneumatic control valve 03. When the third pneumatic control valve 04 depressurizes its pneumatic control end to reverse its direction, the main air source of the fifth pneumatic control valve 09 and the remote control system 20 or the local control system 30 control the air source to interrupt the air supply and depressurize. The control system fails, and the motor stops running due to the interruption of the air source. At the same time, the control air circuit of the air cut-off braking device S also quickly exhausts air and applies braking. At this time, the motor can only be operated in the reverse direction by pressing the start button 25 of the remote control system 20 or the start button 34 of the local control system 30 again. If the motor is operated in the original direction, the limit protection will immediately restart the protection program.

[0043] The overload protection air circuit 50 mainly consists of a sixth air control valve 51 and a pressure regulating valve 52. One end of the air control port of the sixth air control valve 51 is connected to the lifting air circuit of the motor M through the fourth air control valve 05 and the first one-way valve 06. The control air source of the remote control system 20 or the local control system 30 after startup is connected to the air inlet of the sixth air control valve 51 and the pressure regulating valve 52 through the fifth shuttle valve 14, and then connected to the other end of the air control port of the sixth air control valve 51 after pressure regulation. When the remote control system 20 or the local control system 30 controls the winch to lift, the air pressure of the lifting air control port of the air control valve 9 pushes the fourth air control valve 05 to switch, so that the lifting air circuit of the motor M is connected to the air control port of the sixth air control valve 51 through the first one-way valve 06. The air pressure of the lifting air circuit of the motor M changes with the load of the winch. The greater the load, the greater the pressure. The higher the pressure, the more the air pressure in the motor M's lifting air path exceeds a certain value set by the pressure regulating valve. The sixth air control valve 51 will be pushed to the side of the pressure regulating valve 51's set pressure air control port. The inlet and outlet of the sixth air control valve 51 will be connected, and the control air source will reach the air control port of the second air control valve 03 through the sixth shuttle valve 15 to reverse its direction. This will cause the third air control valve 04 to cut off the main air source of the air control valve 9 and the operation control air source of the remote control system 20 or the local control system 30 due to the pressure relief at the air control port, and the control system will fail. The motor will stop running due to the interruption of the air source. At the same time, the control air path of the air cut-off braking device S will also quickly exhaust air and apply braking. At this time, normal operation can only be restored after the overload is released and the start button 25 of the remote control system 20 or the start button 34 of the local control system 30 is pressed again. The fourth pneumatic control valve 05 is designed to ensure complete pressure relief at the overload control port of the sixth pneumatic control valve 51 during non-lifting operation, guaranteeing the reliability and accuracy of overload protection. The first one-way valve 06 ensures relatively stable air pressure at the overload control port of the sixth pneumatic control valve 51 during lifting operation, unaffected by instantaneous pressure changes in the lifting air path, such as sudden, brief pressure spikes caused by rapid operation or load inertia, which could lead to misjudgments in the overload system. The sixth shuttle valve 15 ensures that the limit protection air path 40 and the overload protection air path 50 function independently without interfering with each other. The air source connection for the fourth pneumatic control valve 05, the first one-way valve 06, and the control port of the fourth pneumatic control valve 05 are all practical, effective, and precise control methods developed through repeated equipment experiments.

[0044] The second one-way valve 61 of the emergency release air circuit 60 ensures that when the main air source Y is connected, the air tank 64 is always filled with air through the normally open second hand-operated valve 62, and the pressure is maintained for a certain period of time after the main air source Y stops supplying air, so as to ensure the normal implementation of the emergency release operation. When the main air source is suddenly interrupted due to failure or the air supply pipeline bursts, the winch will stop running and apply the brakes. If the load is suspended in mid-air or in an unsafe position at this time, two people can cooperate to carry out the emergency release. One person first presses the winch's hand valve. One person applies the auxiliary brake, while another pulls the second hand-operated valve 62. This allows the compressed air stored in the air tank 64 to reach the air-stop braking device S through the air passage of the first shuttle valve 10 and the quick-release valve 08, opening the brake. Then, the person holding the manual auxiliary brake slowly releases the brake, allowing the load to gradually and safely return to a safe position. If the compressed air in the air tank becomes insufficient due to prolonged pressure holding time, an air pump or other auxiliary inflation tools can be used to replenish the system's air pressure through the inflation nozzle 63, ensuring a safe release operation and guaranteeing operational safety. The volume of the air tank 64 is set according to the air chamber volume of the air-stop braking device S and its brake opening pressure.

[0045] The function of the quick-release valve 08 is to quickly release the gas pressure in the chamber when the air-stop braking device S applies braking, so as to accelerate the braking speed and ensure operational safety.

[0046] As an alternative switching method between local and remote control for the dual-control safety operation of the new pneumatic winch, automatic switching is achieved simply by replacing the first manual valve 01 with the medium-pressure pneumatic control valve 16, and then connecting the E-control ports of the remote control system 20 and the local control system 30 to the two pneumatic control ports of the pneumatic control valve 16 respectively (see...). Figure 2 Under normal conditions, the main air source Y supplies air to the air control ports B of both the remote control system 20 and the local control system 30 simultaneously through the air control valve 16 (neutral position). When the first start valve 25 or the second start valve 34 of the remote control system 20 or the local control system 30 is pressed, the E control port of the remote control system 20 or the local control system 30 will be connected to the air source, pushing the air control valve 16 to switch, thereby maintaining the air supply to the activated control system and cutting off the control air source of the other control system, causing its control to fail. When the operation of the system is stopped and the emergency stop valve of the system is pressed, the air control valve 16 returns to the neutral position, and both the remote control system 20 and the local control system 30 are in the standby control state, thereby realizing the interlocking of the operation of the remote control system 20 and the local control system 30, and more effectively avoiding the safety hazards caused by the misoperation of the dual systems.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention.

Claims

1. A novel pneumatic winch dual-control safety operation method, characterized in that: The system includes a first hand-operated valve (01), a first pneumatic control valve (02), a second pneumatic control valve (03), a third pneumatic control valve (04), a fourth pneumatic control valve (05), a first one-way valve (06), a one-way throttle valve (07), a quick-release valve (08), a fifth pneumatic control valve (09), a first shuttle valve (10), a second shuttle valve (11), a third shuttle valve (12), a fourth shuttle valve (13), a fifth shuttle valve (14), a sixth shuttle valve (15), a remote control system (20), a local control system (30), a limit protection air circuit (40), an overload protection air circuit (50), an emergency release air circuit (60), and an associated system. The remote control system (20) includes a first button valve (21), a second button valve (22), and a first emergency stop valve (23). The local control system (30) includes a manual directional valve (31), a second emergency stop valve (32), an eighth shuttle valve (33), and a second start valve (34). The limit protection air circuit (40) includes a mechanical valve (41), a ninth shuttle valve (42), a tenth shuttle valve (43), a first mechanical valve (44), and a second mechanical valve (45). The overload protection air circuit (50) includes a sixth pneumatic control valve (51) and a pressure regulating valve (52). The emergency release air circuit (60) includes a second check valve (61), a second hand-operated valve (62), an air inlet (63), and an air tank (64). The associated system includes a compressed air source Y, a winch motor M, and a winch air cut-off brake S. The manual auxiliary braking device S1 of the winch, the main air circuit of the compressed air source Y is connected to the first hand-operated valve (01), the second check valve (61) of the emergency release air circuit (60) and the third air control valve (04) respectively. The main air circuit connected to the third air control valve (04), the third air control valve (04) and the fifth air control valve (09) should be adapted to the maximum air consumption of the motor M. One end of the air control port of the sixth air control valve (51) is connected to the lifting air circuit of the motor M through the fourth air control valve (05) and the first check valve (06). The new pneumatic winch remote and near dual control safety operation control method includes the following steps: ① Manually control the first hand-operated valve (01) to switch to the local control state. At this time, the control air source has also reached the first air control valve (02). The seventh air control valve (2) has connected the manual reversing valve (31) of the local control system (30) to the outlet of the third air control valve (04), but the air inlet of the third air control valve (04) is still closed, and the winch cannot be operated by operating the manual reversing valve (31). ② When the second start valve (34) is pressed, the control air source will reach the air control port of the third air control valve (04) through the eighth shuttle valve (33), the second emergency stop valve (32), the fifth shuttle valve (14), and the second air control valve (03) to push it to switch. The main air source reaches its outlet, and then reaches the air inlet of the fifth air control valve (09), and reaches the air inlet of the manual reversing valve (31) through the first air control valve (02), while pushing the eighth shuttle valve (33) to switch.Block and maintain the exhaust port passage to the second start valve (34) that has been reversed and reset. At this time, operate the manual reversing valve (31) to control the air source to reverse through the outlet of the manual reversing valve (31), the third shuttle valve (12) or the fourth shuttle valve (13) to the two air control ports of the fifth air control valve (09), so that the main air source compressed air reaches the inlet and outlet ports of the motor M. At the same time, the compressed air at the outlet of the fifth air control valve (09) passes through the passage of the second shuttle valve (11), the third shuttle valve (12) and the quick exhaust valve (08) to the air cut-off braking device S to open the brake, so as to realize the forward or reverse operation of the motor. When the manual reversing valve (31) returns to the neutral position, since both the manual reversing valve (31) and the fifth air control valve (09) are in the middle leakage function, the two inlet and outlet ports of the motor M leak air and stop running. At the same time, the control air circuit of the air cut-off braking device S is also connected to the atmosphere and brakes by quickly venting air through the quick exhaust valve (08). The following steps are also included: ③ When an emergency occurs during operation, the manual reversing valve (31) is stuck and cannot return to the neutral position. Quickly press the second emergency stop valve (32). The air control port of the third air control valve (04) will pass through the second air control valve (03), the fifth shuttle valve (14) and the second emergency stop valve (32). When the air is released and the pressure is released, the third air control valve (04) switches to interrupt the supply of air to the manual switching valve (31) and the fifth air control valve (09) and vents the air, the winch stops running. At the same time, the control air circuit of the air cut-off braking device S also quickly vents the air and applies the brake to ensure the safety of the operation. The following steps are also included: ④ When the air circuit of the first hand-operated valve (01) is connected to the remote control system (20), the air control port of the first air control valve (02) is in a zero-pressure state, the seventh air control valve (2) is normally open, and the air inlets of the first button valve (21) and the second button valve (22) of the remote control system (20) are connected to the outlet of the third air control valve (04). However, the air inlet of the third air control valve (04) is still closed, and the winch cannot be operated by operating the first button valve (21) and the second button valve (22). When the first start valve (25) is pressed, the control air source will pass through the first The seventh shuttle valve (24), the first emergency stop valve (23), the fifth shuttle valve (14), and the second pneumatic control valve (03) reach the pneumatic control port of the third pneumatic control valve (04) to push it to switch direction. The main air source reaches its outlet, and then reaches the air inlet of the fifth pneumatic control valve (09). It also reaches the air inlet of the first button valve (21) and the second button valve (22) through the first pneumatic control valve (02). At the same time, it pushes the seventh shuttle valve (24) to switch direction, blocking the exhaust port passage to the first start valve (25) that has been switched and reset, and keeping it there. At this time, pressing the first button valve (21) or the second button valve (22) controls the air source to switch direction through the air outlet of the first button valve (21) or the second button valve (22), the third shuttle valve (12) or the fourth shuttle valve (13) to the two pneumatic control ports of the fifth pneumatic control valve (09), so that the main air source compressed air reaches the air inlet and exhaust port of the motor M. At the same time,Compressed air from the outlet of the fifth pneumatic control valve (09) passes through the channels of the second shuttle valve (11), the third shuttle valve (12), and the quick exhaust valve (08) to the air-stop braking device S, thus opening the brake and enabling the motor to operate in either the forward or reverse direction.

2. The novel pneumatic winch dual-control safety operation control method according to claim 1, characterized in that: It also includes the following steps: ⑤ When neither the first button valve (21) nor the second button valve (22) is pressed, since the outlets of the first button valve (21) and the second button valve (22) are open to the atmosphere, and the fifth air control valve (09) is in the middle leakage function, the two inlet and outlet ports of the motor M are leaking air and stop running. At the same time, the control air circuit of the air cut-off braking device S is also connected to the atmosphere and brakes quickly by venting air through the quick exhaust valve (08).

3. The novel pneumatic winch dual-control safety operation control method according to claim 2, characterized in that: It also includes the following steps: ⑥ When an emergency occurs during operation, the first button valve (21) and the second button valve (22) are stuck and cannot pop up to reset. Quickly press the first emergency stop valve (23). The air control port of the third air control valve (04) will exhaust and depressurize through the second air control valve (03), the fifth shuttle valve (14) and the first emergency stop valve (23). The third air control valve (04) will switch to interrupt the supply of air to the first button valve (21), the second button valve (22) and the fifth air control valve (09) and exhaust the air. The winch will stop running. At the same time, the control air circuit of the air cut-off braking device S will also quickly exhaust the air and implement braking. The function of the third shuttle valve (12), the fourth shuttle valve (13) and the fifth shuttle valve (14) in the air circuit is to slide the shuttle valve to the non-operational system end when operating the remote control system (20) or the local control system (30), so that the operation of the remote control system (20) and the local control system (30) will not affect each other, and ensure that their independent operation is normal and safe.

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