A main control valve assembly for large towing cranes

Abstract

This invention discloses a main control valve assembly for a large cable towing machine, comprising a valve block, an electromagnetic proportional directional valve, a pressure compensator, a threaded cartridge relief valve, a threaded cartridge check valve, a threaded cartridge shuttle valve, a proportional pilot relief valve, a threaded cartridge check valve, a threaded cartridge electromagnetic shut-off valve, and a plate-type electromagnetic directional valve. The control valve assembly has a P port as the oil inlet, connected to the output oil of the hydraulic system pump; a T port as the oil return port, connected to the hydraulic system's oil tank; an L port as the oil discharge port, also connected to the hydraulic system's oil tank; a Z port as the control port, connected to the control port of the relief valve of the balance valve assembly; A and B oil outlets, respectively connected to the balance valve assembly of the working motor; and X and Y oil outlets connected to the high and low speed control ports of the motor. The beneficial effects of this invention are: the valve assembly integrates the control functions of a large cable towing machine, ensuring that the large cable towing machine can complete various towing operations, and possessing unique safety and reliability. This invention provides a hydraulic control device for a large cable towing machine to achieve various functions.

Description

Technical Field

[0001] This invention relates to a hydraulic control valve assembly, specifically a main control valve assembly for large towing cable winches, belonging to the field of marine engineering machinery technology. Background Technology

[0002] Large towing winches are crucial pieces of equipment on ships. Currently, the reliability and safety of towing winch control are relatively poor. Furthermore, in rough seas or when the towed vessel experiences significant resistance, the cable tension can exceed its strength, posing a danger. Therefore, high requirements are placed on the control of towing winches. To achieve the required reliability and safety specifications for towing winches, the hydraulic control requirements of large towing winches need to be designed and studied. This paper presents a main control valve assembly for large towing winches, which can be used for hydraulic control of large towing winches. It can effectively and reliably perform key tasks such as high-speed cable retrieval and release, towing other vessels under constant cable tension control, and cable retrieval and release at rated tension and speed. Summary of the Invention

[0003] This invention provides a main control valve assembly for large towing cable cranes, ensuring the reliability and safety of large towing cable cranes in actual applications, while meeting the requirements for achieving various performance indicators.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: the valve group has a valve block, an electromagnetic proportional directional valve, a pressure compensator, a threaded cartridge relief valve, a threaded cartridge check valve 1.5, a threaded cartridge shuttle valve, a proportional pilot relief valve, a threaded cartridge check valve 1.8, a threaded cartridge electromagnetic shut-off valve, and a plate-type electromagnetic directional valve. The valve block is provided with two high-pressure oil circuits inside, and the valve block is interconnected with the above-mentioned valve components through each oil circuit.

[0005] The valve block is machined with an oil inlet P for the hydraulic pump that connects to the main oil circuit, an oil return port T that connects to the oil tank, oil ports X and Y that connect to the high and low speed control of the motor, and A and B that connect to the main oil port of the motor; and a Z port that connects to the main relief valve control port of the motor balance valve group. The valve block is internally connected in parallel to the oil replenishment circuit of the electromagnetic proportional directional valve.

[0006] The high-pressure oil from the valve assembly's inlet P enters the P port of the electromagnetic proportional directional valve 1.2 via pressure compensator 1.3, and the other high-pressure oil enters the inlet P1 of the two-position three-way electromagnetic directional valve 1.10. One path of the pressure compensator 1.3's control port is connected to the outlet of shuttle valve 1.6 at outlets A and B of the electromagnetic proportional directional valve 1.2. The other path of the pressure compensator 1.3's control port is connected to the outlet of a relief valve 1.4 via check valve 1.8, and to port 2 of electromagnetic shut-off valve 1.9. Port 1 of electromagnetic shut-off valve 1.9 is connected to the inlet of electromagnetic proportional relief valve 1.7, and the outlet of electromagnetic proportional relief valve 1.7... The oil port and the T port of the two-position three-way solenoid directional valve 1.10 are connected to L respectively. The oil inlet of the check valve 1.5 is connected to the T port of the solenoid proportional directional valve 1.2. The oil outlet of the check valve 1.5 is connected to the B port of the solenoid proportional directional valve 1.2. The external oil inlet of the relief valve 1.4 is Z. The external interfaces A1 and B1 of the two-position three-way solenoid directional valve 1.10 are X and Y. The external interfaces of the solenoid proportional directional valve 1.2 are A and B. The X and Y ports and the control ports on the motor form the high and low speed control circuit of the motor. The Z port and the relief valve of the balance valve group on the motor form the constant tension control circuit of the motor. The A and B ports form the control circuit for the direction of rotation and speed of the motor.

[0007] Furthermore, the valve assembly contains three hydraulic circuits, which effectively control the high and low speeds, constant tension, and rotational speed of the motor of the large cable towing machine.

[0008] Furthermore, the valve assembly adopts a plate-type two-position three-way solenoid directional valve, which directly draws a high-pressure oil from the pump port P of the hydraulic system for adjusting the high and low speeds of the motor. In the default state, the motor operates at low speed and high torque, and ensures that the motor operates at low speed and high torque in the default state of power failure.

[0009] Furthermore, when the valve assembly is in the automatic constant tension control position, the solenoid directional valve 1.2 is in the flow oil inlet state, the solenoid shut-off valve 1.9 receives a signal, the overflow valve 1.4 compares with the control signal 1.3 of the pressure compensator, the solenoid shut-off valve receives a signal, and the control port pressure of the overflow valve on the balance valve assembly is adjusted by the electromagnetic proportional overflow 1.7, opening or closing the check valve 1.8. The pressure compensator opens or closes according to the change of control pressure, forming overflow control at motor ports A and B. When the pressure is high, the overflow valve opens, oil enters motor port B, the motor is dragged backward, and the cable loosens. When the pressure is low, oil enters motor port A, and the cable tightens, so that the cable is always in a constant tension state, completing the automatic constant tension control.

[0010] Furthermore, due to the function of the pressure compensator 1.3, the electromagnetic proportional directional valve 1.2 on the valve group ensures that the flow rate of the main valve core will not change with the load change when the load changes, thus ensuring that the towing cable machine will not experience sudden changes in speed in large wind and waves.

[0011] Furthermore, the valve assembly employs an electro-proportional relief valve. By opening the electromagnetic shut-off valve, the pressure of the relief valve on the motor balance valve assembly is remotely controlled, changing the pressure of the electromagnetic proportional relief valve to maintain constant tension on the cable of the towing machine. A certain pressure difference is formed between the A and B ports of the motor through the relief valve, keeping the cable tension within a certain range. This avoids frequent forward and reverse rotation of the motor while preventing the cable from breaking due to excessive stress.

[0012] Furthermore, the cable retrieval and release of the cable towing machine are accomplished by switching the electromagnetic proportional directional valve on the valve assembly on and off. Through the pressure compensator before the valve, the pressure difference before and after the electromagnetic proportional directional valve remains unchanged under load fluctuations, the opening of the main valve core remains unchanged, and the output flow of the main valve remains unchanged, thus ensuring that the cable retrieval and release of the cable towing machine operates at a stable speed.

[0013] Furthermore, the valve group T port replenishes oil to the motor when the cable crane is towing backwards via a check valve connected in parallel to the electromagnetic proportional directional valve T and B ports. Since the main valve is connected in parallel with the check valve, the back pressure generated by the T port opens the check valve and passes through the motor's B port, replenishing oil to the motor when it is towing backwards, preventing the motor from being damaged due to lack of oil when the backwards speed is high.

[0014] Furthermore, the valve block has various holes for the installation of various valve components.

[0015] The beneficial effects of this invention are as follows: The main control valve group for large towing cable winches provided by this invention is an optimized design of the towing cable winch control valve group. It integrates direction, speed, constant tension, and high / low speed control functions. The principle is to achieve high / low speed switching of the motor through an electromagnetic directional valve, to achieve speed and direction control of the towing cable winch motor through an electromagnetic proportional directional valve, and to achieve constant tension control of the towing cable by remotely controlling the pressure of the main relief valve of the motor balance valve group through remote control of the electromagnetic proportional relief valve. This invention can effectively meet the various operating conditions of the towing cable winch, improving the reliability and safety of the towing cable winch in actual operating environments. Attached Figure Description

[0016] The invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the present invention.

[0019] Figure 3 This is a rear view of the present invention.

[0020] Figure 4 This is a schematic diagram illustrating an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of an embodiment of the present invention. Detailed Implementation

[0022] Example

[0023] This invention provides a main control valve assembly for large towing cranes, such as... Figure 1 , 2 As shown in Figure 3, the valve assembly includes a valve block 1.1, an electromagnetic proportional directional valve 1.2, a pressure compensator 1.3, a threaded cartridge relief valve 1.4, a threaded cartridge check valve 1.5, a threaded cartridge shuttle valve 1.6, a proportional pilot relief valve 1.7, a threaded cartridge check valve 1.8, a threaded cartridge electromagnetic shut-off valve 1.9, and a plate-type electromagnetic directional valve 1.10. The valve assembly also includes a pressure testing connector, which can be modified into a pressure sensor as needed to accurately detect the pressure at motor ports A and B. By calculating the tension borne by the cable, the pressure value of the proportional relief valve can be changed, thereby adjusting the constant tension.

[0024] The valve block is machined with a high-pressure oil circuit provided by the hydraulic system: an inlet port P, a return port T connected to the oil tank, ports A, B, and Z connected to the motor balance valve assembly, and ports X and Y connected to the motor high and low speed ports. One path of the high-pressure oil from the valve assembly's inlet port P passes through pressure compensator 1.3 and enters port P of the electromagnetic proportional directional valve 1.2; the other path enters inlet port P1 of the two-position three-way electromagnetic directional valve 1.10. One path of the pressure compensator 1.3's control port is connected to the outlet ports A and B of the electromagnetic proportional directional valve 1.2 via shuttle valve 1.6. The other path of the pressure compensator 1.3's control port passes through check valve 1.8 and is connected to the outlet port of a relief valve 1.4, and to port 2 of the electromagnetic shut-off valve 1.9. The electromagnetic shut-off valve 1.9... Port 1 is connected to the inlet of the electromagnetic proportional relief valve 1.7. The outlet of the electromagnetic proportional relief valve 1.7 and the T port of the two-position three-way electromagnetic directional valve 1.10 are connected to L respectively. The inlet of the check valve 1.5 is connected to the T port of the electromagnetic proportional directional valve 1.2. The outlet of the check valve 1.5 is connected to the B port of the electromagnetic proportional directional valve 1.2. The external inlet of the relief valve 1.4 is Z. The external interfaces A1 and B1 of the two-position three-way electromagnetic directional valve 1.10 are X and Y. The external interfaces of the electromagnetic proportional directional valve 1.2 are A and B. Ports X and Y form the high and low speed control circuit of the motor with the control port on the motor. Port Z forms the constant tension control circuit of the motor with the relief valve of the balance valve group on the motor. Ports A and B form the control circuit for the direction of rotation and speed of the motor.

[0025] By employing a pressure compensator before the valve, the pressure difference before and after the electromagnetic proportional directional valve remains constant under load fluctuations, the opening of the main valve core remains constant, the output flow of the main valve remains constant, and the cable towing machine operates at a stable speed when winding and unwinding the cable.

[0026] The system employs a small-flow oil inlet using an electromagnetic proportional directional valve and remotely controls the main relief valve of the balance valve group. By adjusting the control pressure of the electromagnetic proportional relief valve, the oil inlet direction at ports A and B of the motor is changed to meet the constant tension requirement of the cable for the cable towing machine.

[0027] An electromagnetic reversing valve is used to change the piston position of the motor to adjust the motor speed (high or low); the motor is set to low speed and high displacement by default.

[0028] An electromagnetic proportional relief valve is used to change the constant tension control setting of the motor and adjust the pressure value at the motor outlet, thereby ensuring that the tension of the cable of the towing machine is within the preset value.

[0029] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A main control valve assembly for a large towing cable machine, characterized in that: It includes a valve block, a solenoid proportional directional valve, a pressure compensator, a threaded cartridge relief valve, a threaded cartridge check valve, a threaded cartridge shuttle valve, a proportional pilot relief valve, a threaded cartridge check valve, a threaded cartridge solenoid shut-off valve, and a plate-type solenoid directional valve. The valve block is internally equipped with P and T oil passages, A and B oil passages, and X, Y, Z, and L oil passages. The valve block is connected to the above-mentioned valve components through interconnecting oil passages. The valve block is machined with an oil inlet P for the hydraulic pump connected to the main oil circuit, an oil return port T connected to the oil tank, oil ports X and Y connected to the high and low speed control of the motor, oil ports A and B connected to the main oil port of the motor, and a Z port connected to the main relief valve control port of the motor balance valve group. One path of the high-pressure oil from the valve group's oil inlet P enters the P port of the electromagnetic proportional directional valve 1.2 via the pressure compensator 1.3, and the other path enters the P1 port of the two-position three-way electromagnetic directional valve 1.

10. One path of the pressure compensator 1.3 control port is connected to the outlet port 1.6 of the shuttle valves A and B of the electromagnetic proportional directional valve 1.2, and the other path of the pressure compensator 1.3 control port is connected to the outlet port of one relief valve 1.4 via a check valve 1.8, and to the 2nd port of the electromagnetic shut-off valve 1.

9. The electromagnetic shut-off valve 1.9's port 1 is connected to the inlet of the electromagnetic proportional relief valve 1.

7. The outlet of the electromagnetic proportional relief valve 1.7 and the T port of the two-position three-way electromagnetic directional valve 1.10 are connected to L respectively. The inlet of the check valve 1.5 is connected to the T port of the electromagnetic proportional directional valve 1.

2. The outlet of the check valve 1.5 is connected to the B port of the electromagnetic proportional directional valve 1.

2. The external inlet of the relief valve 1.4 is Z. The external interfaces A1 and B1 of the two-position three-way electromagnetic directional valve 1.10 are X and Y, and the external interfaces of the electromagnetic proportional directional valve 1.2 are A and B. The X and Y ports, together with the control ports on the motor, form the high and low speed control circuit of the motor. The Z port, together with the relief valve of the balance valve group on the motor, forms the constant tension control circuit of the motor. The A and B ports form the control circuit for the direction of rotation and speed of the motor.

2. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: The valve assembly contains three hydraulic circuits.

3. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: The valve group uses a plate-type two-position three-way solenoid directional valve for high and low speed control. The high-pressure oil supplied by the hydraulic system inlet P completes the oil circuit switching when a signal is received. In the default state, the motor operates at low speed and high torque.

4. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: When the valve assembly is in the automatic constant tension control position, the solenoid directional valve 1.2 is in the flow oil inlet state, the solenoid shut-off valve 1.9 receives a signal, the overflow valve 1.4 compares with the control signal 1.3 of the pressure compensator, the solenoid shut-off valve receives a signal, and the control port pressure of the overflow valve on the balance valve assembly is adjusted by the solenoid proportional overflow valve 1.7, opening or closing the check valve 1.

8. The pressure compensator opens or closes according to the change of control pressure, forming overflow control at motor ports A and B. When the pressure is high, the overflow valve opens, oil enters motor port B, the motor is dragged backward, and the cable loosens. When the pressure is low, oil enters motor port A, and the cable tightens, so that the cable is always in a constant tension state, completing the automatic constant tension control.

5. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: The valve assembly uses an electro-proportional relief valve. By opening the electromagnetic shut-off valve, the pressure of the relief valve on the motor balance valve assembly is remotely controlled, and the pressure of the electromagnetic proportional relief valve is changed to control the constant tension of the cable of the towing machine, so that the relief valve forms a pressure difference at the A and B ports of the motor.

6. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: The valve assembly controls the cable winding and unwinding of the cable reversing machine by switching the electromagnetic proportional directional valve on and off. The pressure compensator before the valve ensures that the pressure difference across the electromagnetic proportional directional valve remains constant under load fluctuations, the opening of the main valve core remains constant, and the output flow of the main valve remains constant.

7. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: The valve group at port T replenishes oil to the motor during the reverse towing of the cable crane via a check valve connected in parallel to ports T and B of the electromagnetic proportional directional valve.

8. The main control valve assembly for a large towing cable machine according to claim 1, characterized in that: The valve block has various holes for the installation of various valve components.

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