A method of starting a rotary motor

Abstract

This invention provides a method for starting a rotary motor, which is achieved by controlling the oil circuit. The specific steps include: S1 The oil tank outputs hydraulic oil to one of the ports of the rotary motor through the first oil outlet or the second oil outlet; S2 A portion of the hydraulic oil flows to the control end of the first directional valve; S3 When the oil pressure of the hydraulic oil is greater than that of the first directional valve; (1) The first directional valve reverses, so that the P end of the first directional valve is connected to the A end; (2) The hydraulic oil flows to the first directional valve through the first port or the second port of the two-way valve; (3) The hydraulic oil flows to the control port of the two-way valve through the first directional valve; (4) The two-way valve opens, and the hydraulic oil flowing to one port of the rotary motor flows to the other port of the rotary motor through the two-way valve; (5) Both ports of the rotary motor contain hydraulic oil.

Description

Technical Field

[0001] This invention relates to the field of crane technology, and more specifically to a method for starting a rotary motor. Background Technology

[0002] Cranes mainly consist of three movements: slewing, luffing, and hoisting. Both the boom and jib can achieve a wide range of slewing and luffing movements. The boom slewing movement, in particular, is achieved by using a slewing motor to rotate the crane's load from one horizontal position to another.

[0003] A rotating lifting device is disclosed in Chinese patent application No. 202321223144.4, published on September 19, 2023. The device includes a lifting body and a hydraulic system. The lifting body includes a lifting seat and a rotating seat. A drive mechanism is provided on the lifting seat. The rotating seat is connected to a hanging object. The drive mechanism drives the rotating seat to rotate, thereby causing the hanging object to rotate, thus controlling the rotation of the object. A connecting component is provided on the top of the lifting seat.

[0004] When cranes are used on ships, the ship's movement on the sea surface, caused by waves, can result in the crane being uneven, with one side higher than the other. Existing slewing motors do not continuously supply oil for balancing when the crane is not in use. This means that if the crane is not used for a period of time, the hydraulic system may lack oil to provide balancing force to the slewing motor. Consequently, when the slewing motor is suddenly started after a long period of inactivity, the lack of oil supply for balancing can lead to unstable starting of the slewing motor. Summary of the Invention

[0005] This invention provides a method for starting a rotary motor, which allows both ends of the rotary motor to be filled with hydraulic oil before starting, thereby enabling the rotary motor to start stably without slippage. The method is reliable and simple.

[0006] To achieve the above objectives, the technical solution of the present invention is: a method for starting a rotary motor, which is achieved by controlling the oil circuit, and the specific steps include:

[0007] The S1 oil tank outputs hydraulic oil to one of the ports of the rotary motor through either the first or second oil outlet.

[0008] A portion of the hydraulic oil in S2 flows to the control end of the first directional valve.

[0009] S3 When the hydraulic oil pressure is greater than that of the first directional valve.

[0010] (1) The first directional valve reverses, so that the P end of the first directional valve is connected to the A end.

[0011] (2) The hydraulic oil flows to the first directional valve through the first or second port of the two-way valve.

[0012] (3) The hydraulic oil flows through the first directional valve to the control port of the two-way valve.

[0013] (4) When the two-way valve is opened, the hydraulic oil flowing to one port of the rotary motor flows to the other port of the rotary motor through the two-way valve.

[0014] (5) Hydraulic oil is present at both ports of the rotary motor.

[0015] The above method, through the control process of the control oil circuit, ensures that when the rotary motor needs to be steered, the hydraulic oil in the tank flows through either the first or second outlet to one port of the rotary motor. A portion of the hydraulic oil flows to the control end of the first directional valve. When the hydraulic oil pressure flowing to the first directional valve gradually increases and exceeds the switching pressure of the first directional valve, the first directional valve starts and reverses, thereby connecting the P end of the first directional valve to the A end. This allows the hydraulic oil flowing to the rotary motor to flow through the first or second port of the two-way valve, passing through the P end and A end of the first directional valve, into the control port of the two-way valve, thus opening the control port of the two-way valve. This allows the hydraulic oil flowing to one port of the rotary motor to flow through the first and second ports of the two-way valve to the other port of the rotary motor, ensuring that both ports of the rotary motor have hydraulic oil. This prevents the rotary motor from rotating spontaneously during startup, stabilizing the hydraulic circuit. By balancing the oil supply to the rotary motor, the balance of the rotary motor during startup is achieved. The method is reliable and simple.

[0016] Furthermore, a control oil circuit is provided between the oil tank and the rotary motor; a first oil outlet and a second oil outlet are provided at the oil inlet end of the oil tank, the first oil outlet is connected to the left rotation port of the rotary motor, the second oil outlet is connected to the right rotation port of the rotary motor, the rotary motor is also connected to the oil return end of the oil tank, and the left and right rotation ports of the rotary motor are also connected to the control oil circuit.

[0017] The control oil circuit includes a first directional valve and a two-way valve. The first port of the two-way valve is connected to the right-turn port of the rotary motor, and the second port of the two-way valve is connected to the left-turn port of the rotary motor. The P end of the first directional valve is connected to the first port and the second port of the two-way valve. The T end of the first directional valve is connected to the return oil end of the oil tank. The A end of the first directional valve is connected to the control port of the two-way valve. The B end of the first directional valve is normally closed. The control end of the first directional valve is connected to the inlet oil end of the oil tank.

[0018] The above settings, by configuring the control oil circuit, ensure that the hydraulic oil flowing to one port of the rotary motor flows through the first and second ports of the two-way valve to the other port of the rotary motor. This ensures that both ports of the rotary motor have hydraulic oil, thereby preventing the rotary motor from rotating spontaneously when it starts.

[0019] Furthermore, a first control check valve is provided between the first and second ports of the two-way valve and the P end of the first directional valve. The oil inlet of the first control check valve is connected to the first and second ports of the two-way valve, and the oil outlet of the first control check valve is connected to the P end of the first directional valve. Through the first control check valve, the hydraulic oil flowing to the P end of the first directional valve can be prevented from flowing back into the two-way valve.

[0020] Furthermore, a balancing oil circuit is provided between the rotary motor and the oil tank; the balancing oil circuit includes a first balancing valve and a second balancing valve. The first balancing valve is provided between the left-hand rotation port of the rotary motor and the first oil outlet of the oil tank, and the second balancing valve is provided between the right-hand rotation port of the rotary motor and the second oil outlet of the oil tank. By integrating the two balancing valves to form a bidirectional balancing valve, the smoothness of the rotary start is ensured.

[0021] Furthermore, the first balancing valve includes a first overflow valve and a first check valve; the second balancing valve includes a second overflow valve and a second check valve, the oil outlet of the first overflow valve is connected to a first oil outlet through a first oil outlet pipe, and the oil inlet of the first overflow valve is connected to the left-hand rotation port of the rotary motor; the oil outlet of the second overflow valve is connected to a second oil outlet through a second oil outlet pipe, and the oil inlet of the second overflow valve is connected to the right-hand rotation port of the rotary motor.

[0022] The inlet of the first check valve is connected to the outlet of the first relief valve, and the outlet of the first check valve is connected to the inlet of the first relief valve; the inlet of the second check valve is connected to the outlet of the second relief valve, and the outlet of the second check valve is connected to the inlet of the second relief valve.

[0023] The control end of the first relief valve is connected to the second oil outlet pipe through a balance control pipeline; the control end of the second relief valve is connected to the first oil outlet pipe through a balance control pipeline; the control end of the first relief valve is also connected to the oil outlet end of the first check valve through a balance control pipeline; the control end of the second relief valve is also connected to the oil outlet end of the second check valve through a balance control pipeline.

[0024] The above configuration, by setting up a first relief valve and a second relief valve to form a two-way balance valve, can balance the hydraulic oil pressure in the first oil outlet pipe and the second oil outlet pipe, thereby regulating the oil pressure and flow rate of the hydraulic oil to the rotary motor, thus making the flow of hydraulic oil smooth.

[0025] Furthermore, a rotary control pipe is provided between the first and second oil outlet pipes. The inlet end of the rotary control pipe is connected to the first and second oil outlet pipes, and the outlet end of the rotary control pipe is connected to the control end of the first directional valve. Step S2 specifically includes a portion of the hydraulic oil flowing through the rotary control pipe to the control end of the first directional valve. By setting up the rotary control pipe, when the oil tank supplies hydraulic oil to the rotary motor, a portion of the hydraulic oil can flow through the rotary control pipe to the first directional valve, thereby controlling the start of the rotary motor.

[0026] Furthermore, a second control shuttle valve is provided between the first and second oil outlet pipes. The first port of the second control shuttle valve is connected to the first oil outlet pipe, the second port is connected to the second oil outlet pipe, and the third port is connected to the rotary control pipe. By setting the second control shuttle valve, hydraulic oil will not flow to the other oil outlet pipe when it flows from one of the oil outlet pipes to the rotary control pipe.

[0027] Furthermore, step S2 specifically includes that when hydraulic oil flows out through the first outlet pipe, the second control shuttle valve closes the second port, so that the first port and the third port are connected, allowing the hydraulic oil to flow to the rotary control pipe; when hydraulic oil flows out through the second outlet pipe, the second control shuttle valve closes the first port, so that the second port and the third port are connected.

[0028] Furthermore, step (2) specifically includes:

[0029] (21) When making a left turn.

[0030] (21.1) The hydraulic oil flows to the first directional valve through the second port of the two-way valve.

[0031] (22) When making a right turn.

[0032] (22.1) The hydraulic oil flows to the first directional valve through the first port of the two-way valve.

[0033] Furthermore, step (4) specifically includes:

[0034] (41) When making a left turn.

[0035] (41.1) The hydraulic oil flowing to the left turn port of the rotary motor flows to the right turn port of the rotary motor through the two-way valve.

[0036] (42) When making a right turn.

[0037] (42.1) The hydraulic oil flowing to the right turn port of the rotary motor flows to the left turn port of the rotary motor through the two-way valve. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the control oil circuit of the present invention.

[0039] Figure 2 for Figure 1 Enlarged view of point E in the middle.

[0040] Figure 3 for Figure 1 Enlarged view of point F in the middle.

[0041] Figure 4 This is a flowchart of the process of the present invention. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0043] like Figure 4 As shown, a method for starting a rotary motor includes the following steps:

[0044] The S1 oil tank outputs hydraulic oil to one of the ports of the rotary motor through either the first or second oil outlet.

[0045] S11 When making a left turn.

[0046] The S11.1 oil tank outputs hydraulic oil to the left-hand rotation port of the rotary motor through the first oil outlet.

[0047] S12 When making a right turn.

[0048] The S12.1 oil tank outputs hydraulic oil to the right-hand rotation port of the rotary motor through the second oil outlet.

[0049] A portion of the hydraulic oil in S2 flows through the rotary control pipeline to the control end of the first directional valve.

[0050] S2.1 When hydraulic oil flows out through the first outlet pipe, the second control shuttle valve closes the second port, connecting the first port and the third port, and the hydraulic oil flows to the rotary control pipe.

[0051] S2.2 When hydraulic oil flows out through the second outlet pipe, the second control shuttle valve closes the first port, connecting the second and third ports, and the hydraulic oil flows to the rotary control pipe.

[0052] S3 When the hydraulic oil pressure is greater than that of the first directional valve.

[0053] (1) The first directional valve reverses, so that the P end of the first directional valve is connected to the A end.

[0054] (2) The hydraulic oil flows to the first directional valve through the first or second port of the two-way valve.

[0055] (21) When making a left turn.

[0056] (21.1) The hydraulic oil flows to the first directional valve through the second port of the two-way valve.

[0057] (22) When making a right turn.

[0058] (22.1) The hydraulic oil flows to the first directional valve through the first port of the two-way valve.

[0059] (3) The hydraulic oil flows through the first directional valve to the control port of the two-way valve.

[0060] (4) When the two-way valve is opened, the hydraulic oil flowing to one port of the rotary motor flows to the other port of the rotary motor through the two-way valve.

[0061] (41) When making a left turn.

[0062] (41.1) The hydraulic oil flowing to the left turn port of the rotary motor flows to the right turn port of the rotary motor through the two-way valve.

[0063] (42) When making a right turn.

[0064] (42.1) The hydraulic oil flowing to the right turn port of the rotary motor flows to the left turn port of the rotary motor through the two-way valve.

[0065] (5) Hydraulic oil is present at both ports of the rotary motor.

[0066] The starting method is achieved by controlling the oil circuit, such as... Figures 1-3 As shown, control oil circuit 2 is connected to rotary motor 11, and rotary motor 11 is connected to oil tank 3; oil tank 3 has a first oil outlet 31 and a second oil outlet 32 ​​at the oil inlet end. The first oil outlet 31 is connected to the left rotation port C1 of rotary motor 11, and the second oil outlet 32 ​​is connected to the right rotation port C2 of rotary motor 11. Rotary motor 11 is also connected to the oil return end of oil tank 3. The left rotation port C1 and the right rotation port C2 of rotary motor 11 are also connected to control oil circuit 2.

[0067] like Figure 2 As shown, the control oil circuit 2 includes a first directional valve 21 and a two-way valve 23. The first port 231 of the two-way valve 23 is connected to the right-turn port C2 of the rotary motor 11, and the second port 232 of the two-way valve 23 is connected to the left-turn port C1 of the rotary motor 11. The P end of the first directional valve 21 is connected to the first port 231 and the second port 232 of the two-way valve 23. The T end of the first directional valve 21 is connected to the return oil end of the oil tank 3. The A end of the first directional valve 21 is connected to the control port 233 of the two-way valve 23. The B end of the first directional valve 21 is normally closed. The control end 211 of the first directional valve 21 is connected to the inlet oil end of the oil tank 3.

[0068] A first control check valve 26 is provided between the first port 231 and the second port 232 of the two-way valve 23 and the P end of the first directional valve 21. The oil inlet of the first control check valve 26 is connected to the first port 231 and the second port 232 of the two-way valve 23, and the oil outlet of the first control check valve 26 is connected to the P end of the first directional valve 21. Through the first control check valve 26, the hydraulic oil flowing to the P end of the first directional valve can be prevented from flowing back into the two-way valve 23.

[0069] like Figure 3 As shown, a balancing oil circuit 4 is also provided between the rotary motor 11 and the oil tank 3; the balancing oil circuit 4 includes a first balancing valve 41 and a second balancing valve 42. The first balancing valve 41 is provided between the left-hand rotation port C1 of the rotary motor 11 and the first oil outlet 31 of the oil tank 3, and the second balancing valve 42 is provided between the right-hand rotation port C2 of the rotary motor 11 and the second oil outlet 32 ​​of the oil tank 3. By integrating the two balancing valves to form a bidirectional balancing valve, the smoothness of the rotary start is ensured.

[0070] like Figure 3 As shown, the first balance valve 41 includes a first overflow valve 411 and a first check valve 412; the second balance valve 42 includes a second overflow valve 421 and a second check valve 422. The oil outlet of the first overflow valve 411 is connected to the first oil outlet 31 through the first oil outlet pipe V1, and the oil inlet of the first overflow valve 411 is connected to the left turn port 1C of the rotary motor 11; the oil outlet of the second overflow valve 421 is connected to the second oil outlet 32 ​​through the second oil outlet pipe V2, and the oil inlet of the second overflow valve 421 is connected to the right turn port C2 of the rotary motor 11.

[0071] The oil inlet of the first check valve 412 is connected to the oil outlet of the first relief valve 411, and the oil outlet of the first check valve 412 is connected to the oil inlet of the first relief valve 411; the oil inlet of the second check valve 422 is connected to the oil outlet of the second relief valve 421, and the oil outlet of the second check valve 422 is connected to the oil inlet of the second relief valve 421.

[0072] The control end of the first overflow valve 411 is connected to the second oil outlet pipe V2 through the balance control pipe 40; the control end of the second overflow valve 421 is connected to the first oil outlet pipe V1 through the balance control pipe 40; the control end of the first overflow valve 411 is also connected to the oil outlet end of the first check valve 412 through the balance control pipe 40; the control end of the second overflow valve 421 is also connected to the oil outlet end of the second check valve 422 through the balance control pipe 40.

[0073] The above configuration, by setting the first overflow valve 411 and the second overflow valve 412 to form a two-way balance valve, can balance the hydraulic oil pressure of the first oil outlet pipe V1 and the second oil outlet pipe V2, thereby regulating the oil pressure and flow rate of the hydraulic oil to the rotary motor 11, thus making the flow of hydraulic oil smooth.

[0074] like Figure 3 As shown, a rotary control pipe BR is provided between the first oil outlet pipe V1 and the second oil outlet pipe V2. The inlet end of the rotary control pipe BR is connected to the first oil outlet pipe V1 and the second oil outlet pipe V2, and the outlet end of the rotary control pipe BR is connected to the control end of the first directional valve 21. By setting up the rotary control pipe BR, when the oil tank 3 supplies hydraulic oil to the rotary motor 11, a portion of the hydraulic oil can flow through the rotary control pipe BR to the first directional valve 21, thereby controlling the start of the rotary motor 11.

[0075] like Figure 3 As shown, a second control shuttle valve 27 is provided between the first oil outlet pipe V1 and the second oil outlet pipe V2. The first port 271 of the second control shuttle valve 27 is connected to the first oil outlet pipe V1, the second port 272 is connected to the second oil outlet pipe V2, and the third port 273 is connected to the rotary control pipe BR. By setting the second control shuttle valve 27, hydraulic oil will not flow to the other oil outlet pipe when it flows from one of the oil outlet pipes to the rotary control pipe.

[0076] The working principle of this invention is as follows: By setting up control oil circuit 2, when the rotation direction of the rotary motor 11 needs to be controlled, the hydraulic oil in the oil tank 3 flows to one of the ports of the rotary motor 11 through either the first oil outlet V1 or the second oil outlet V2. A portion of the hydraulic oil flows to the control end of the first directional valve 2. When the hydraulic oil pressure flowing to the first directional valve 21 gradually increases and eventually exceeds the switching oil pressure of the first directional valve 21, the first directional valve 21 is activated and reversed, thereby connecting the P end of the first directional valve 21 to the A end, thus allowing the hydraulic oil flowing to the rotary motor 11 to... Oil can flow into the control port of the two-way valve 23 through the first port 231 or the second port 232 of the two-way valve 23 via the P and A ends of the first directional valve 21, thereby opening the control port of the two-way valve 23. This allows the hydraulic oil flowing to one port of the rotary motor 11 to flow to the other port of the rotary motor 11 through the first port 231 and the second port 232 of the two-way valve 23. This ensures that both ports of the rotary motor 11 have hydraulic oil, thus preventing the rotary motor 11 from rotating spontaneously when it starts, and stabilizing the hydraulic circuit.

Claims

1. A method for starting a rotary motor, achieved by controlling an oil circuit, characterized in that: A control oil circuit is provided between the oil tank and the rotary motor; a first oil outlet and a second oil outlet are provided at the oil inlet end of the oil tank. The first oil outlet is connected to the left rotation port of the rotary motor, and the second oil outlet is connected to the right rotation port of the rotary motor. The rotary motor is also connected to the oil return end of the oil tank. The left rotation port and the right rotation port of the rotary motor are also connected to the control oil circuit. The control oil circuit includes a first directional valve and a two-way valve. The first port of the two-way valve is connected to the right-turn port of the rotary motor, and the second port of the two-way valve is connected to the left-turn port of the rotary motor. The P end of the first directional valve is connected to the first port and the second port of the two-way valve. The T end of the first directional valve is connected to the return oil end of the oil tank. The A end of the first directional valve is connected to the control port of the two-way valve. The B end of the first directional valve is normally closed. The control end of the first directional valve is connected to the inlet oil end of the oil tank. A first control check valve is provided between the first and second ports of the two-way valve and the P end of the first directional valve. The oil inlet of the first control check valve is connected to the first and second ports of the two-way valve, and the oil outlet of the first control check valve is connected to the P end of the first directional valve. The specific steps include: The S1 oil tank outputs hydraulic oil to one of the ports of the rotary motor through either the first or the second oil outlet. A balance oil circuit is also provided between the rotary motor and the oil tank. The balance oil circuit includes a first balance valve and a second balance valve. The first balance valve is provided between the left-hand port of the rotary motor and the first oil outlet of the oil tank, and the second balance valve is provided between the right-hand port of the rotary motor and the second oil outlet of the oil tank. S2 A portion of the hydraulic oil flows to the control end of the first directional valve; S3 When the hydraulic oil pressure is greater than that of the first directional valve; (1) The first directional valve reverses, so that the P end of the first directional valve is connected to the A end; (2) The hydraulic oil flows to the first directional valve through the first or second port of the two-way valve; (3) The hydraulic oil flows through the first directional valve to the control port of the two-way valve; (4) When the two-way valve is opened, the hydraulic oil flowing to one port of the rotary motor flows through the two-way valve to the other port of the rotary motor; (5) Hydraulic oil is present at both ports of the rotary motor.

2. A method of starting a rotary motor as claimed in claim 1, wherein: The first balance valve includes a first overflow valve and a first check valve; the second balance valve includes a second overflow valve and a second check valve. The oil outlet of the first overflow valve is connected to the first oil outlet through a first oil outlet pipe, and the oil inlet of the first overflow valve is connected to the left-hand rotation port of the rotary motor. The oil outlet of the second overflow valve is connected to the second oil outlet through a second oil outlet pipe, and the oil inlet of the second overflow valve is connected to the right-hand rotation port of the rotary motor. The inlet of the first check valve is connected to the outlet of the first relief valve, and the outlet of the first check valve is connected to the inlet of the first relief valve; the inlet of the second check valve is connected to the outlet of the second relief valve, and the outlet of the second check valve is connected to the inlet of the second relief valve. The control end of the first relief valve is connected to the second oil outlet pipe through a balance control pipeline; the control end of the second relief valve is connected to the first oil outlet pipe through a balance control pipeline; the control end of the first relief valve is also connected to the oil outlet end of the first check valve through a balance control pipeline; the control end of the second relief valve is also connected to the oil outlet end of the second check valve through a balance control pipeline.

3. A method of starting a rotary motor as claimed in claim 2, wherein: A rotary control pipe is provided between the first oil outlet pipe and the second oil outlet pipe. The oil inlet end of the rotary control pipe is connected to the first oil outlet pipe and the second oil outlet pipe, and the oil outlet end of the rotary control pipe is connected to the control end of the first directional valve. Step S2 specifically includes a portion of the hydraulic oil flowing through the rotary control pipe to the control end of the first directional valve.

4. A method of starting a rotary motor as claimed in claim 3, wherein: A second control shuttle valve is provided between the first oil outlet pipe and the second oil outlet pipe. The first port of the second control shuttle valve is connected to the first oil outlet pipe, the second port of the second control shuttle valve is connected to the second oil outlet pipe, and the third port of the second control shuttle valve is connected to the rotary control pipe.

5. A method of starting a rotary motor as claimed in claim 4, wherein: Step S2 further includes that when hydraulic oil flows out through the first outlet pipe, the second control shuttle valve closes the second port, so that the first port and the third port are connected, allowing the hydraulic oil to flow to the rotary control pipe; when hydraulic oil flows out through the second outlet pipe, the second control shuttle valve closes the first port, so that the second port and the third port are connected.

6. A method of starting a rotary motor as defined in claim 1, wherein: Step (2) specifically includes: (21) When making a left turn; (21.1) The hydraulic oil flows to the first directional valve through the second port of the two-way valve; (22) When making a right turn; (22.1) The hydraulic oil flows to the first directional valve through the first port of the two-way valve.

7. The starting method for a rotary motor according to claim 1, characterized in that: Step (4) specifically includes: (41) When making a left turn; (41.1) The hydraulic oil flowing to the left turn port of the rotary motor flows to the right turn port of the rotary motor through the two-way valve; (42) When making a right turn; (42.1) The hydraulic oil flowing to the right turn port of the rotary motor flows to the left turn port of the rotary motor through the two-way valve.

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