Hydraulic control system and cable tensioning system

Abstract

A hydraulic control system and a cable tensioning system, the hydraulic control system comprises a hydraulic motor, a hydraulic oil tank, and a quantitative hydraulic pump and a variable hydraulic pump connected to the hydraulic oil tank, the hydraulic oil tank can contain liquid; the hydraulic control system also comprises a valve body assembly, the valve body assembly comprises a hydraulically controlled reversing valve group and a mode switching valve, the hydraulically controlled reversing valve group comprises a hydraulically controlled reversing valve; the first working end of the hydraulically controlled reversing valve is connected to the variable hydraulic pump; the first working end of the mode switching valve is connected to the quantitative hydraulic pump, and is configured so that when the mode switching valve is switched to a first conduction state, the variable hydraulic pump, the hydraulically controlled reversing valve and the hydraulic motor are connected to form a first oil supply circuit. The driving process of the hydraulic control system is safe and reliable, and easy to operate.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a hydraulic control system and a cable tensioning system. Background Art

[0002] When deep-sea operation robots are performing underwater operations, they need to connect the umbilical cable to the ship's power supply system and control system. In the non-operating state, the umbilical cable needs to be wound on the umbilical cable winch drum for storage. The winding process requires a certain pre-tightening force to be applied to the cable, which can be several tons or more than ten tons, to avoid the cable from becoming tangled or jumping during the winding process of the winch drum, and to avoid the cable from biting due to the heavy load during the lowering and lifting of the deep-sea operation robot and its auxiliary systems. Therefore, when the cable is wound, a device that simulates the application of load to increase the pre-tightening force is required. This device is called a cable tensioner. Summary of the invention

[0003] At least one embodiment of the present disclosure provides a hydraulic control system, which includes a hydraulic motor, a hydraulic oil tank, and a fixed-displacement hydraulic pump and a variable-displacement hydraulic pump connected to the hydraulic oil tank, wherein the hydraulic oil tank can contain liquid; and a valve body assembly, including a hydraulically controlled reversing valve group and a mode switching valve, wherein the hydraulically controlled reversing valve group includes a hydraulically controlled reversing valve; a first working end of the hydraulically controlled reversing valve is connected to the variable-displacement hydraulic pump; a first working end of the mode switching valve is connected to the fixed-displacement hydraulic pump, and is configured such that when the mode switching valve is switched to a first conduction state, the variable-displacement hydraulic pump, the hydraulically controlled reversing valve and the hydraulic motor are connected to form a first oil supply circuit.

[0004] For example, in the hydraulic control system provided by at least one embodiment of the present disclosure, the valve body assembly also includes a pilot overflow valve and a hydraulically controlled overflow valve for controlling the working pressure of the pilot overflow valve, and when the mode switching valve is switched to the second conduction state, the hydraulic motor is connected to the pilot overflow valve and the hydraulically controlled overflow valve to form a second oil supply circuit.

[0005] For example, in the hydraulic control system provided by at least one embodiment of the present disclosure, the hydraulic motor has a first oil port and a second oil port, the first oil port and the second oil port are respectively connected to the second working end and the third working end of the hydraulically controlled reversing valve, the valve body assembly also includes a selection handle valve group, the selection handle valve group is connected to the quantitative hydraulic pump, and has a first control valve and a second control valve, the first control valve and the second control valve are respectively connected to the first control end and the second control end of the hydraulically controlled reversing valve, and are configured to select the conduction state of the hydraulically controlled reversing valve, thereby controlling one of the first oil port and the second oil port to be an oil inlet and the other to be an oil outlet.

[0006] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the hydraulically controlled reversing valve group also includes two overflow valves, and the two overflow valves are respectively configured to be connectable to the second working end and the third working end of the hydraulically controlled reversing valve to limit the pressure fed back to the variable hydraulic pump by the second working end and the third working end.

[0007] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, a first shuttle valve is provided between the two overflow valves, and is configured to select the maximum pressure transmitted between the second working end and the third working end and return it to the variable hydraulic pump.

[0008] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the valve body assembly also includes a first switching valve between the third working end of the hydraulically controlled reversing valve and the second oil port, and is configured such that when the mode switching valve is switched to a first conduction state, the first switching valve is opened, and when the mode switching valve is switched to a second conduction state, the first switching valve is closed.

[0009] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the mode switching valve includes a two-position four-way valve, the first switch valve includes a first two-position two-way valve, and the control end of the first two-position two-way valve is connected to the first working end of the mode switching valve to be controlled by the mode switching valve.

[0010] For example, the hydraulic control system provided by at least one embodiment of the present disclosure also includes a brake, wherein the valve body assembly also includes a brake valve and a second shuttle valve, the brake valve is connected to the first control valve and the second control valve through the second shuttle valve, and is configured to control the brake locking target drive device when the first control valve and the second control valve are in a disconnected state, and control the brake releasing the locking target drive device when the first control valve or the second control valve is in an open state.

[0011] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the valve body assembly also includes an oil replenishment anti-shock valve group connecting the first oil port and the second oil port, and the oil replenishment anti-shock valve group is configured to supply oil to one of the first oil port and the second oil port.

[0012] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the oil replenishment anti-shock valve group includes a first one-way valve connected to the first oil port and a first overflow valve connected to the first one-way valve, and also includes a second one-way valve connected to the second oil port and a second overflow valve connected to the second one-way valve, and is configured so that the first oil port is an oil inlet and the second oil port is an oil outlet.

[0013] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the valve body assembly also includes a second switch valve between the pilot overflow valve and the hydraulically controlled overflow valve, and when the mode switching valve is switched to the second conduction state, the second switch valve is opened, and when the mode switching valve is switched to the first conduction state, the second switch valve is closed.

[0014] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the mode switching valve includes a two-position four-way valve, the second switch valve includes a second two-position two-way valve, and the control end of the second two-position two-way valve is connected to the second working end of the mode switching valve to be controlled by the mode switching valve.

[0015] For example, in the hydraulic control system provided by at least one embodiment of the present disclosure, the valve body assembly also includes an oil replenishment anti-shock overflow valve and a third switch valve, the first working end of the oil replenishment anti-shock overflow valve is connected to the hydraulic oil tank, the second working end of the oil replenishment anti-shock overflow valve is connected to the first working end of the third switch valve, the second working end of the third switch valve is connected to one of the two overflow valves of the hydraulically controlled reversing valve group, and is configured such that when the third switch valve is in an open state, the oil replenishment anti-shock overflow valve is connected to the first oil port through one of the two overflow valves, and when the third switch valve is in a disconnected state, the oil replenishment anti-shock overflow valve is disconnected from the first oil port.

[0016] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the control end of the third switch valve is connected to the mode switching valve, and is configured such that when the mode switching valve is switched to the second conduction state, the third switch valve is opened, and when the mode switching valve is switched to the first conduction state, the third switch valve is closed.

[0017] For example, the hydraulic control system provided by at least one embodiment of the present disclosure further includes a first filter disposed between the hydraulic oil tank and the fixed displacement hydraulic pump and a second filter disposed between the hydraulic oil tank and the variable displacement hydraulic pump.

[0018] For example, in the hydraulic control system provided in at least one embodiment of the present disclosure, the fixed displacement hydraulic pump includes a gear pump or a vane pump; and the variable displacement hydraulic pump includes a load-sensitive control plunger pump or a pressure-compensated control plunger pump.

[0019] At least one embodiment of the present disclosure further provides a cable tensioning system, comprising a hydraulic control system and a cable tensioner provided in an embodiment of the present disclosure, the cable tensioner having a normal mode, when the mode switching valve of the hydraulic control system is switched to a first conduction state, the cable tensioner is in the normal mode, and the cable tensioner can realize the functions of collecting and releasing the cable.

[0020] For example, in the cable tensioning system provided by at least one embodiment of the present disclosure, the valve body assembly of the hydraulic control system also includes a pilot overflow valve and a hydraulically controlled overflow valve for controlling the working pressure of the pilot overflow valve, and when the mode switching valve is switched to the second conduction state, the hydraulic motor is connected to the pilot overflow valve and the hydraulically controlled overflow valve to form a second oil supply circuit; the cable tensioner also has a load mode, and when the mode switching valve is switched to the second conduction state, the cable tensioner is in the load mode, and the cable tensioner can realize a passive cable releasing function to simulate the load weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0022] Figure 1 A schematic block diagram of a hydraulic control system provided for at least one embodiment of the present disclosure;

[0023] Figure 2 Another schematic block diagram of a hydraulic control system provided for at least one embodiment of the present disclosure;

[0024] Figure 3 A circuit connection diagram of a hydraulic control system provided for at least one embodiment of the present disclosure; and

[0025] Figure 4 A schematic diagram of line connections of a cable tensioning system provided in at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] At present, the cable tensioning systems on the market usually have a simple working mode and only have basic functions such as collecting and releasing cables. In addition, the driving system is driven by a driving motor, etc., with a single function and a low safety factor, which cannot meet the needs of users.

[0029] At least one embodiment of the present disclosure provides a hydraulic control system, which includes a hydraulic motor, a hydraulic oil tank, and a fixed-displacement hydraulic pump and a variable-displacement hydraulic pump connected to the hydraulic oil tank, and the hydraulic oil tank can contain liquid; the hydraulic control system also includes a valve body assembly, the valve body assembly includes a hydraulically controlled reversing valve group and a mode switching valve, the hydraulically controlled reversing valve group includes a hydraulically controlled reversing valve; the first working end of the hydraulically controlled reversing valve is connected to the variable-displacement hydraulic pump; the first working end of the mode switching valve is connected to the fixed-displacement hydraulic pump, and is configured such that when the mode switching valve is switched to a first conduction state, the variable hydraulic pump, the hydraulically controlled reversing valve and the hydraulic motor are connected to form a first oil supply circuit.

[0030] At least one embodiment of the present disclosure further provides a cable tensioning system, which includes the above-mentioned hydraulic control system and a cable tensioner, and the cable tensioner has a normal mode and a load mode. In the normal mode, the cable tensioner can realize the functions of collecting and releasing the cable, and in the load mode, the cable tensioner can realize the passive cable releasing function to simulate the load weight, thereby having multifunctionality; on the other hand, the cable tensioning system is driven by a hydraulic drive device, and the driving process is safe and reliable, and easy to operate.

[0031] The hydraulic control system and the cable tensioning system provided by the embodiments of the present disclosure are described below through several specific embodiments.

[0032] At least one embodiment of the present disclosure provides a hydraulic control system. Figure 1 A schematic block diagram of the hydraulic control system is shown in FIG. Figure 1As shown, the hydraulic control system includes a hydraulic motor 13, a hydraulic oil tank 1, and a quantitative hydraulic pump 5 and a variable hydraulic pump 6 connected to the hydraulic oil tank 1. The hydraulic oil tank 1 can contain liquid, such as hydraulic oil or other liquids that can transmit power. The hydraulic control system also includes a valve body assembly, which includes a hydraulically controlled reversing valve group and a mode switching valve 16. The hydraulically controlled reversing valve group includes a hydraulically controlled reversing valve 81; the first working end of the hydraulically controlled reversing valve 81 is connected to the variable hydraulic pump 6; the first working end of the mode switching valve 16 is connected to the quantitative hydraulic pump 5, and is configured so that when the mode switching valve 16 is switched to the first conduction state, the variable hydraulic pump 6, the hydraulically controlled reversing valve 81 and the hydraulic motor 13 are connected to form a first oil supply circuit.

[0033] For example, the hydraulic pressure output by the quantitative hydraulic pump 5 is constant, and is used to provide the pilot pressure oil for the valve body assembly to realize the reversing function of each valve in the valve body assembly; the pressure output by the variable hydraulic pump 6 is adjustable, thereby providing different hydraulic pressures, and then providing different driving forces. For example, in some examples, the quantitative hydraulic pump 5 may include a gear pump or a vane pump, etc.; the variable hydraulic pump 6 includes a load-sensitive control plunger pump or a pressure-compensated control plunger pump, etc. The embodiments of the present disclosure do not limit the specific forms of the quantitative hydraulic pump 5 and the variable hydraulic pump 6.

[0034] For example, in some embodiments, Figure 2 As shown, the valve body assembly may also include a pilot relief valve 20 and a hydraulically controlled relief valve 19 for controlling the working pressure of the pilot relief valve 20. When the mode switching valve 16 is switched to the second conduction state, the hydraulic motor 13 is connected to the pilot relief valve 20 and the hydraulically controlled relief valve 19 to form a second oil supply circuit.

[0035] Thus, the hydraulic control system can have at least two oil supply circuits to realize multi-way oil supply and driving functions. For example, the hydraulic control system can be used to drive a winch, a cable tensioning device, etc., so that the winch, the cable tensioning device, etc. are in different working states under different oil supply circuits.

[0036] For example, Figure 3 FIG. 4 shows a schematic diagram of specific circuit connections of a hydraulic control system provided by at least one embodiment of the present disclosure. Figure 3As shown, the hydraulic motor 13 has a first oil port A and a second oil port B, and the first oil port A and the second oil port B are respectively connected to the second working end C and the third working end D of the hydraulically controlled reversing valve 81. When the hydraulically controlled reversing valve 81 is in different states, the direction of the first oil supply circuit formed between the variable hydraulic pump 6, the hydraulically controlled reversing valve 81 and the hydraulic motor 13 can be hydraulic oil tank 1-variable hydraulic pump 6-hydraulic controlled reversing valve 81-first oil port A of the hydraulic motor 13-second oil port B of the hydraulic motor 13-hydraulic controlled reversing valve 81-hydraulic oil tank 1, or the first oil supply circuit can be hydraulic oil tank 1-variable hydraulic pump 6-hydraulic controlled reversing valve 81-second oil port B of the hydraulic motor 13-first oil port A of the hydraulic motor 13-hydraulic controlled reversing valve 81-hydraulic oil tank 1.

[0037] For example, the hydraulic motor 13 can be connected to the target drive device 14 to drive the target drive device 14 to work. For example, the target drive device 14 can be a winch, a cable tensioner, etc., so that different oil supply circuits of the hydraulic drive system can achieve different working states of the winch and the cable tensioner.

[0038] For example, Figure 3 As shown, in some embodiments, the valve body assembly may further include a selection handle valve group 10, which is connected to the quantitative hydraulic pump 5 and has a first control valve 01 and a second control valve 02. The first control valve 01 and the second control valve 02 are respectively connected to the first control end C1 and the second control end C2 of the hydraulically controlled reversing valve 81, and are configured to select the conduction state of the hydraulically controlled reversing valve 81, thereby controlling one of the first oil port A and the second oil port B of the hydraulic motor 13 as an oil inlet and the other as an oil outlet.

[0039] For example, in some embodiments, the hydraulically controlled reversing valve group may be an electric proportional reversing valve group having a load feedback function. For example, the hydraulically controlled reversing valve group further includes two relief valves 24, which are respectively configured to be connectable to the second working end C and the third working end D of the hydraulically controlled reversing valve 81, for example, they can be connected in different reversing states of the hydraulically controlled reversing valve 81 to limit the pressure of the second working end C and the third working end D fed back to the variable hydraulic pump 6. For example, the two relief valves 24 respectively have feedback ends LS / A and LS / B, and the variable hydraulic pump 6 has a feedback end LS, and the feedback ends LS / A and LS / B are both connected to the feedback end LS of the variable hydraulic pump 6. Thus, the variable hydraulic pump 6 can adjust the output hydraulic pressure of the variable hydraulic pump 6 according to the feedback pressure obtained at the feedback end LS.

[0040] For example, in some examples, a first shuttle valve 23 is provided between the two overflow valves 24, and the first shuttle valve 23 is configured to select the maximum pressure transmitted between the second working end C and the third working end D and return it to the variable hydraulic pump 6, so that the variable hydraulic pump 6 can control the working pressure of the variable hydraulic pump 6 based on the maximum pressure.

[0041] For example, Figure 3 As shown, in some embodiments, the valve body assembly may also include a first switch valve 21 between the third working end D and the second oil port B of the hydraulically controlled reversing valve 81, and the first switch valve 21 is configured to open when the mode switching valve 16 switches to the first conduction state, and to close when the mode switches to the second conduction state, thereby controlling the conversion of the oil supply circuit.

[0042] For example, in some examples, the first switch valve 21 includes a first two-position two-way valve, and the control end 3 of the first two-position two-way valve is connected to the first working end 3 of the mode switching valve so that the first two-position two-way valve is controlled by the mode switching valve 16.

[0043] For example, Figure 1 As shown, in some embodiments, the valve body assembly may further include an oil replenishment and anti-shock valve group 22 connected to the first oil port A and the second oil port B of the hydraulic motor 13. The oil replenishment and anti-shock valve group 22 is configured to supply oil to one of the first oil port A and the second oil port B, thereby preventing the hydraulic motor 13 from rotating due to external force and causing air suction and other undesirable phenomena in the case of user error operation, and can also effectively avoid instantaneous hydraulic shock. For example, in the case of user error operation, the hydraulic motor 13 will rotate due to external force. At this time, the oil replenishment and anti-shock valve group 22 will replenish oil and reduce the pressure shock of the hydraulic motor 13, thereby protecting and extending the service life of the hydraulic motor 13.

[0044] For example, in some examples, the oil replenishment anti-shock valve group 22 includes a first one-way valve connected to the first oil port A and a first overflow valve connected to the first one-way valve, and also includes a second one-way valve connected to the second oil port B and a second overflow valve connected to the second one-way valve. These valve bodies cooperate with each other so that the first oil port A is the oil inlet and the second oil port B is the oil outlet.

[0045] For example, the hydraulic motor 13 may have a built-in brake or an external brake. Figure 3As shown, in some embodiments, the cable tensioning system may further include a brake 12, and the valve body assembly may further include a brake valve 11 and a second shuttle valve 9, the brake valve 11 is connected to the first control valve 01 and the second control valve 02 through the second shuttle valve 9, and is configured to control the brake 12 to lock the target drive device 14 when the first control valve 01 and the second control valve 02 are in the disconnected state, and control the brake 12 to unlock the target drive device 14 when the first control valve 01 and the second control valve 02 are in the open state. Thus, the second shuttle valve 9 will automatically select the higher pressure oil output from the first control valve 01 and the second control valve 02 of the handle valve group 10 to switch the direction of the brake valve 11, and further release the brake 12. Thus, by operating the handle valve group 10, the automatic release of the brake 12 can be achieved. For example, in some examples, the brake valve 11 includes a two-position three-way valve.

[0046] For example, Figure 3 As shown, in some embodiments, the valve body assembly may also include a second switch valve 17 between the pilot relief valve 20 and the hydraulically controlled relief valve 19. When the mode switching valve 16 is switched to the second conduction state, the second switch valve 17 is opened, so that the hydraulic motor 13 is connected to the pilot relief valve 20 and the hydraulically controlled relief valve 19 to form an oil supply circuit; when the mode switching valve 16 is switched to the second conduction state, the second switch valve 14 is closed, the pilot relief valve 20 and the hydraulically controlled relief valve 19 are disconnected, and the hydraulic motor 13 cannot form an oil supply circuit with the pilot relief valve 20 and the hydraulically controlled relief valve 19.

[0047] For example, in some embodiments, a pressure gauge 18 is provided between the hydraulically controlled relief valve 19 and the second switch valve 17 for detecting the set pressure of the hydraulically controlled relief valve 19 .

[0048] For example, in some examples, the second switch valve 17 includes a second two-position two-way valve, and the control end 3 of the second two-position two-way valve is connected to the second working end 4 of the mode switching valve 17, so that the second two-position two-way valve is controlled by the mode switching valve 17. For example, the oil inlet end 1 of the mode switching valve 17 is connected to the quantitative hydraulic pump 5 to obtain the conversion driving force, and the oil outlet end 2 of the mode switching valve 17 is connected to the oil tank to return oil.

[0049] For example, in some embodiments, the valve body assembly may further include an oil replenishing anti-shock overflow valve 26 and a third switch valve 25, the first working end T of the oil replenishing anti-shock overflow valve 26 being connected to the hydraulic oil tank 1, the second working end P of the oil replenishing anti-shock overflow valve 26 being connected to the first working end 1 of the third switch valve 25, the second working end 2 of the third switch valve 25 being connected to one of the two overflow valves 24 of the hydraulically controlled reversing valve group, and being configured such that when the third switch valve 25 is in an open state, the oil replenishing anti-shock overflow valve 26 is connected to the first oil port A through one of the above-mentioned two overflow valves 24, for example, connected to the first oil port A through the hydraulically controlled reversing valve 81, and when the third switch valve 25 is in a disconnected state, the oil replenishing anti-shock overflow valve 26 is disconnected from the first oil port A. Therefore, the oil replenishment and anti-shock relief valve 26 can realize the function of controlling the pressure of the second working end C of the hydraulically controlled reversing valve 81, and then realize the function of adjusting the pressure of the first oil port A of the hydraulic motor 13, and the pressure can be adjusted to a lower level to realize the oil replenishment and anti-cavitation effect of the hydraulic motor 13 being passively rotated by the load, thereby realizing the function of protecting the hydraulic motor 13.

[0050] For example, in some embodiments, the control end 4 of the third switch valve 25 is connected to the mode switching valve 16, and is configured such that when the mode switching valve 16 is switched to the second conduction state, the third switch valve 25 is opened, and when the mode switching valve 16 is switched to the first conduction state, the third switch valve 25 is closed. For example, in some examples, the third switch valve 25 includes a two-position three-way valve.

[0051] For example, Figure 1 As shown, in some embodiments, the hydraulic drive system may further include a first filter disposed between the hydraulic oil tank 1 and the fixed-displacement hydraulic pump 5 and a second filter disposed between the hydraulic oil tank 1 and the variable-displacement hydraulic pump 6 to filter impurities in the liquid to protect the fixed-displacement hydraulic pump 5 and the variable-displacement hydraulic pump 6, extend the service life of the fixed-displacement hydraulic pump 5 and the variable-displacement hydraulic pump 6, and prevent impurities in the liquid from entering the connecting pipeline to cause blockage or inaccurate hydraulic supply and other defects.

[0052] For example, Figure 1 As shown, in some embodiments, the quantitative hydraulic pump 5 may also be connected to a relief valve 3 and a pressure gauge 4. For example, the relief valve 3 may be a pilot relief valve or a direct-acting relief valve, the relief valve 3 may set the working pressure of the quantitative hydraulic pump 5, and the pressure gauge 4 is used to measure the working pressure of the quantitative hydraulic pump 5.

[0053] For example, the P port of the variable hydraulic pump 6 is connected to the P port of the hydraulically controlled reversing valve group 8, and a pressure gauge 7 is provided in the middle to measure the outlet pressure of the variable hydraulic pump 6, so as to further display the working status of the variable hydraulic pump 6.

[0054] In addition, it should be noted that the connection ports of all the above-mentioned components in the hydraulic drive system can be connected using hydraulic hoses or metal hard pipes, and the embodiments of the present disclosure do not specifically limit the connection pipelines between the components.

[0055] In the following, the target driving device 14 is taken as a cable tensioner as an example to introduce a cable tensioning system in which the cable tensioner is driven by a hydraulic driving system. It should be noted that when the target driving device 14 is other devices such as a winch, its structure and driving method are basically the same as those of the cable tensioning system, so the description of the cable tensioning system can be referred to.

[0056] At least one embodiment of the present disclosure further provides a cable tensioning system, comprising a hydraulic control system and a cable tensioner provided in an embodiment of the present disclosure, the cable tensioner having a normal mode. When the mode switching valve of the hydraulic control system is switched to a first conduction state, the cable tensioner is in the normal mode, and the cable tensioner can realize the functions of collecting and releasing the cable.

[0057] For example, the valve body assembly of the hydraulic control system also includes a pilot relief valve and a hydraulically controlled relief valve for controlling the working pressure of the pilot relief valve. When the mode switching valve is switched to the second conduction state, the hydraulic motor is connected to the pilot relief valve and the hydraulically controlled relief valve to form a second oil supply circuit. At this time, the cable tensioner also has a load mode. When the mode switching valve is switched to the second conduction state, the cable tensioner is in the load mode, and the cable tensioner can realize a passive cable releasing function to simulate the load weight.

[0058] For example, Figure 4 A schematic diagram of the line connection of the cable tensioning system is shown.

[0059] like Figure 4 As shown, the cable tensioning system includes the above-mentioned hydraulic control system and a cable tensioner 14. The cable tensioner 14 has a normal mode and a load mode. In the normal mode, the cable tensioner 14 can realize the functions of collecting and releasing the cable. In the load mode, the cable tensioner can realize the passive cable releasing function to simulate the load weight.

[0060] For example, the hydraulic control system includes a hydraulic motor 13, a hydraulic oil tank 1, and a fixed hydraulic pump 5 and a variable hydraulic pump 6 connected to the hydraulic oil tank 1. For example, the hydraulic pressure output by the fixed hydraulic pump 5 is constant, and is used to provide pilot pressure oil to the valve body assembly to realize the switching function of each valve in the valve body assembly; the pressure output by the variable hydraulic pump 6 is adjustable, thereby providing different hydraulic pressures, and then providing different driving forces. The hydraulic oil tank 1 can contain liquids, such as hydraulic oil or other liquids that can transmit power.

[0061] For example, in some examples, the fixed-displacement hydraulic pump 5 may include a gear pump or a vane pump, etc.; the variable hydraulic pump 6 may include a load-sensitive control plunger pump or a pressure-compensated control plunger pump, etc., so as to realize the hydraulic feedback function, and then the size of the hydraulic pressure provided by the variable hydraulic pump 6 can be automatically adjusted according to the hydraulic feedback.

[0062] For example, the valve body assembly is composed of multiple valves, including multiple connection ends, and the multiple connection ends are respectively connected to the fixed-displacement hydraulic pump 5, the variable-displacement hydraulic pump 6 and the cable tensioner 14 (directly or indirectly) to control the flow direction of the liquid in the hydraulic oil tank 1, thereby controlling the working state of the cable tensioner 14.

[0063] For example, the valve body assembly may include a hydraulically controlled reversing valve group 8 and a mode switching valve 16, and the hydraulically controlled reversing valve group 8 includes a hydraulically controlled reversing valve 81. The first working end W1 of the hydraulically controlled reversing valve 81 is connected to the variable hydraulic pump 6. For example, in some examples, a pressure gauge 7 is further connected between the first working end W1 of the hydraulically controlled reversing valve 81 and the variable hydraulic pump 6 to detect the working pressure of the variable hydraulic pump 6 and further display the working state of the variable hydraulic pump 6. The first working end of the mode switching valve 16 (i.e., port 1 of the mode switching valve 16 shown in the figure) is connected to the quantitative hydraulic pump 5, and is configured to control the working state of the cable tensioner 14. When the mode switching valve 16 is switched to make the cable tensioner 14 in the normal mode, the variable hydraulic pump 6, the hydraulically controlled reversing valve 81 and the cable tensioner 14 are connected to form an oil supply circuit. At this time, the cable tensioner 14 can realize the functions of collecting and releasing the cable.

[0064] For example, in some examples, the hydraulically controlled reversing valve 81 includes a three-position seven-way valve, and the mode switching valve 16 includes a two-position four-way valve. For example, the mode switching valve 16 can be manually controlled or electrically controlled.

[0065] For example, Figure 4 As shown, in some embodiments, the cable tensioner 14 includes a tensioner drum, and the hydraulic motor 13 is configured to control the rotation direction and rotation speed of the tensioner drum, thereby controlling the cable release and collection state and the cable release and collection speed of the tensioner drum. For example, in some examples, a reducer 15 may be provided between the cable tensioner 14 and the hydraulic motor 13, and the output shaft of the hydraulic motor 13 is connected to the input end of the reducer 15 by means of a spline or a flat key, and the output end of the reducer 13 is connected to the cable tensioner 14, so that the hydraulic motor 13 can serve as a driving element of the reducer 15 and the cable tensioner 14, driving the reducer 15 and the cable tensioner 14 to rotate and transmit torque.

[0066] For example, Figure 4As shown, the hydraulic motor 13 has a first oil port A and a second oil port B, and the first oil port A and the second oil port B are respectively connected to the second working end C and the third working end D of the hydraulically controlled reversing valve 8. When the hydraulically controlled reversing valve 8 is in different states, the direction of the oil supply circuit formed between the variable hydraulic pump 6, the hydraulically controlled reversing valve 81 and the hydraulic motor 13 can be hydraulic oil tank 1-variable hydraulic pump 6-hydraulicly controlled reversing valve 81-first oil port A of the hydraulic motor 13-second oil port B of the hydraulic motor 13-hydraulic controlled reversing valve 81-hydraulic oil tank 1, or the oil supply circuit can be hydraulic oil tank 1-variable hydraulic pump 6-hydraulic controlled reversing valve 81-second oil port B of the hydraulic motor 13-first oil port A of the hydraulic motor 13-hydraulic controlled reversing valve 81-hydraulic oil tank 1. One of the above two oil supply circuits can realize the cable releasing function of the cable tensioner, and the other can realize the collecting function.

[0067] For example, Figure 4 As shown, in some embodiments, the valve body assembly may further include a selection handle valve group 10, which is connected to the quantitative hydraulic pump 5 and has a cable-releasing control valve (shown in the figure as collecting, implemented as the above-mentioned first control valve 01) and a collecting control valve (shown in the figure as releasing, implemented as the above-mentioned second control valve 02). The cable-releasing control valve and the collecting control valve are respectively connected to the first control end C1 and the second control end C2 of the hydraulic-controlled reversing valve 81, and are configured to select the conduction state of the hydraulic-controlled reversing valve 81, thereby controlling one of the first oil port A and the second oil port B of the hydraulic motor 13 as an oil inlet and the other as an oil outlet.

[0068] For example, in some embodiments, the hydraulically controlled reversing valve group may be an electric proportional reversing valve group having a load feedback function. For example, the hydraulically controlled reversing valve group further includes two relief valves 24, which are respectively configured to be connectable to the second working end C and the third working end D of the hydraulically controlled reversing valve 81, for example, they can be connected in different reversing states of the hydraulically controlled reversing valve 81 to limit the pressure of the second working end C and the third working end D fed back to the variable hydraulic pump 6. For example, the two relief valves 24 respectively have feedback ends LS / A and LS / B, and the variable hydraulic pump 6 has a feedback end LS, and the feedback ends LS / A and LS / B are both connected to the feedback end LS of the variable hydraulic pump 6. Thus, the variable hydraulic pump 6 can adjust the output hydraulic pressure of the variable hydraulic pump 6 according to the feedback pressure obtained at the feedback end LS.

[0069] For example, in some examples, a first shuttle valve 23 is provided between the two overflow valves 24, and the first shuttle valve 23 is configured to select the maximum pressure transmitted between the second working end C and the third working end D and return it to the variable hydraulic pump 6, so that the variable hydraulic pump 6 can control the working pressure of the variable hydraulic pump 6 based on the maximum pressure.

[0070] For example, Figure 4As shown, in some embodiments, the valve body assembly may also include a first switch valve 21 between the third working end D and the second oil port B of the hydraulically controlled reversing valve 81. The first switch valve 21 is configured to make the cable tensioner 14 in normal mode when the mode switching valve is switched to the first conduction state, and the first switch valve 21 is opened; when the mode switching valve is switched to the second conduction state, the cable tensioner 14 is in load mode, and the first switch valve 21 is closed, thereby controlling the conversion of the oil supply circuit.

[0071] For example, in some examples, the first switch valve 21 includes a first two-position two-way valve, and the control end 3 of the first two-position two-way valve is connected to the first working end 3 of the mode switching valve so that the first two-position two-way valve is controlled by the mode switching valve 16.

[0072] For example, Figure 4 As shown, in some embodiments, the valve body assembly may further include an oil replenishment and anti-shock valve group 22 connected to the first oil port A and the second oil port B of the hydraulic motor 13. The oil replenishment and anti-shock valve group 22 is configured to supply oil to one of the first oil port A and the second oil port B, thereby preventing the hydraulic motor 13 from rotating due to external force and causing air suction and other undesirable phenomena in the case of user error operation, and can also effectively avoid instantaneous hydraulic shock. For example, in the case of user error operation, the hydraulic motor 13 will rotate due to external force. At this time, the oil replenishment and anti-shock valve group 22 will replenish oil and reduce the pressure shock of the hydraulic motor 13, thereby protecting and extending the service life of the hydraulic motor 13.

[0073] For example, in some examples, the oil replenishment anti-shock valve group 22 includes a first one-way valve connected to the first oil port A and a first overflow valve connected to the first one-way valve, and also includes a second one-way valve connected to the second oil port B and a second overflow valve connected to the second one-way valve. These valve bodies cooperate with each other so that the first oil port A is the oil inlet and the second oil port B is the oil outlet.

[0074] For example, the hydraulic motor 13 may have a built-in brake or an external brake. Figure 1 As shown, in some embodiments, the cable tensioning system may further include a brake 12, and the valve body assembly may further include a brake valve 11 and a second shuttle valve 9. The brake valve 11 is connected to the cable release control valve and the collection control valve through the second shuttle valve 9, and is configured to control the brake 12 to lock the cable tensioner 14 when the cable release control valve and the collection control valve are in a disconnected state, and control the brake 12 to unlock the cable tensioner 14 when the cable release control valve or the collection control valve is in an open state. Thus, the second shuttle valve 9 will automatically select the higher pressure oil output from the cable release control valve and the collection control valve of the handle valve group 10 to switch the direction of the brake valve 11, and further release the brake 12. Thus, by operating the handle valve group 10, the automatic release of the brake 12 can be achieved. For example, in some examples, the brake valve 11 includes a two-position three-way valve.

[0075] For example, Figure 4 As shown, in some embodiments, the valve body assembly may further include a pilot relief valve 20 and a hydraulic relief valve 19 for controlling the working pressure of the pilot relief valve 20. When the mode switching valve 16 is switched to the second conduction state, the cable tensioner 14 is in the load mode, and the cable tensioner 14 is connected with the pilot relief valve 20 and the hydraulic relief valve 19 to form an oil supply circuit. Therefore, when the cable tensioner 14 is in the load mode, the hydraulic relief valve 19 can control the size of the simulated load by controlling the working pressure of the pilot relief valve 20. At this time, the size of the simulated load is proportional to the working pressure of the pilot relief valve 20.

[0076] For example, in the load mode, the hydraulic motor 13 can be rotated by the cable tension applied to the cable tensioner 14 , and the magnitude of the tension is determined by the set pressure of the hydraulically controlled relief valve 19 .

[0077] For example, Figure 4 As shown, in some embodiments, the valve body assembly may further include a second switch valve 17 between the pilot relief valve 20 and the hydraulically controlled relief valve 19. When the mode switching valve 16 is switched to the second conduction state, the cable tensioner 14 is in the load mode, and the second switch valve 17 is opened, so that the cable tensioner 14 is connected with the pilot relief valve 20 and the hydraulically controlled relief valve 19 to form an oil supply circuit; when the mode switching valve 16 is switched to the first conduction state, the cable tensioner 14 is in the normal mode, the second switch valve 14 is closed, the pilot relief valve 20 and the hydraulically controlled relief valve 19 are disconnected, and the cable tensioner 14 cannot form an oil supply circuit with the pilot relief valve 20 and the hydraulically controlled relief valve 19, and thus the load mode cannot be achieved.

[0078] For example, in some embodiments, a pressure gauge 18 is provided between the hydraulically controlled relief valve 19 and the second switch valve 17 for detecting the set pressure of the hydraulically controlled relief valve 19 and further inferring the size of the simulated load.

[0079] For example, in some examples, the second switch valve 17 includes a second two-position two-way valve, and the control end 3 of the second two-position two-way valve is connected to the second working end 4 of the mode switching valve 17, so that the second two-position two-way valve is controlled by the mode switching valve 17. For example, the oil inlet end 1 of the mode switching valve 17 is connected to the quantitative hydraulic pump 5 to obtain the conversion driving force, and the oil outlet end 2 of the mode switching valve 17 is connected to the oil tank to return oil.

[0080] For example, in some embodiments, the valve body assembly may further include an oil replenishing anti-shock overflow valve 26 and a third switch valve 25, the first working end T of the oil replenishing anti-shock overflow valve 26 being connected to the hydraulic oil tank 1, the second working end P of the oil replenishing anti-shock overflow valve 26 being connected to the first working end 1 of the third switch valve 25, the second working end 2 of the third switch valve 25 being connected to one of the two overflow valves 24 of the hydraulically controlled reversing valve group, and being configured such that when the third switch valve 25 is in an open state, the oil replenishing anti-shock overflow valve 26 is connected to the first oil port A through one of the above-mentioned two overflow valves 24, for example, connected to the first oil port A through the hydraulically controlled reversing valve 81, and when the third switch valve 25 is in a disconnected state, the oil replenishing anti-shock overflow valve 26 is disconnected from the first oil port A. Therefore, the oil replenishment and anti-shock relief valve 26 can realize the function of controlling the pressure of the second working end C of the hydraulically controlled reversing valve 81, and then realize the function of adjusting the pressure of the first oil port A of the hydraulic motor 13, and the pressure can be adjusted to a lower level to realize the oil replenishment and anti-cavitation effect of the hydraulic motor 13 being passively rotated by the load, thereby realizing the function of protecting the hydraulic motor 13.

[0081] For example, in some embodiments, the control end 4 of the third switch valve 25 is connected to the mode switching valve 16, and is configured to open the third switch valve 25 when the mode switching valve 16 is switched to the second conduction state, so that the cable tensioner 14 is in the load mode, and the mode switching valve 16 is switched to the first conduction state, so that the cable tensioner 14 is in the normal mode, and the third switch valve 25 is closed, thereby enabling the oil replenishment anti-shock relief valve 26 to function when the cable tensioner 14 is in the load mode. For example, in some examples, the third switch valve 25 includes a two-position three-way valve.

[0082] For example, Figure 4 As shown, in some embodiments, the cable tensioning system may further include a first filter disposed between the hydraulic oil tank 1 and the fixed-displacement hydraulic pump 5 and a second filter disposed between the hydraulic oil tank 1 and the variable-displacement hydraulic pump 6 to filter impurities in the liquid to protect the fixed-displacement hydraulic pump 5 and the variable-displacement hydraulic pump 6, extend the service life of the fixed-displacement hydraulic pump 5 and the variable-displacement hydraulic pump 6, and prevent impurities in the liquid from entering the connecting pipeline to cause blockage or inaccurate hydraulic supply and other defects.

[0083] For example, Figure 4 As shown, in some embodiments, the quantitative hydraulic pump 5 may also be connected to a relief valve 3 and a pressure gauge 4. For example, the relief valve 3 may be a pilot relief valve or a direct-acting relief valve, the relief valve 3 may set the working pressure of the quantitative hydraulic pump 5, and the pressure gauge 4 is used to measure the working pressure of the quantitative hydraulic pump 5.

[0084] For example, the P port of the variable hydraulic pump 6 is connected to the P port of the hydraulically controlled reversing valve 8 , and a pressure gauge 7 is provided in the middle to measure the outlet pressure of the variable hydraulic pump 6 , further displaying the working status of the variable hydraulic pump 6 .

[0085] In addition, it should be noted that the connection ports of all the above-mentioned components in the cable tensioning system can be connected using hydraulic hoses or metal hard pipes, and the embodiments of the present disclosure do not specifically limit the connection pipelines between the components.

[0086] The following describes the working process of the cable tensioning system provided by the embodiment of the present disclosure to realize the normal mode and the load mode of the cable tensioner 14 through an exemplary operation process.

[0087] For the normal mode, firstly, the mode switching valve 16 is switched to the first conduction state, and the cable tensioner 14 is in the normal mode. At this time, the pilot pressure oil provided by the quantitative hydraulic pump 5 flows through the 1st to 4th ports of the mode switching valve 16 to the control end (i.e., the 3rd port of the second switch valve 17 shown in the figure) of the second switch valve 17 (e.g., a two-position two-way valve), pushing the second switch valve 17 to switch to the disconnected state, and the inlet oil circuit of the hydraulic control overflow valve 19 and the pressure gauge 18 is disconnected and does not play any role. At this time, the first switch valve 21 (e.g., a two-position two-way valve) is in a connected state, and a complete liquid flow circuit is formed by the hydraulic motor 13 and the hydraulic control reversing valve 81. At this time, by pressing the cable release control valve or the retracting control valve of the selection handle valve group 10, the brake 12 is released, and the conduction circuit of the hydraulic control reversing valve 81 is controlled, so that the rotation direction of the hydraulic motor 13 can be controlled, and the reducer 15 and the cable tensioner 14 can be further driven to rotate. In normal mode, the third switch valve 25 (e.g., a two-position three-way valve) is disconnected from the LS / A port of the hydraulic control reversing valve group, and does not affect the working pressure of the hydraulic motor 13. Considering that in normal mode, the hydraulic motor 13 is not allowed to be rotated by the cable in principle, because in this case the hydraulic motor 13 will passively rotate and cause the problem of air suction, but the user may make a mistake in the operation process, so the oil replenishment anti-shock valve group 22 is added to the pipeline between the hydraulic motor 13 and the hydraulic control reversing valve 81. Therefore, even if the user makes a mistake in operation and the hydraulic motor 13 is rotated by external force, the oil replenishment anti-shock valve group 22 will also replenish oil and reduce the pressure shock of the hydraulic motor 13, thereby protecting and extending the service life of the hydraulic motor 13.

[0088] For the load mode, first switch the mode switching valve 16 to the second conduction state, and the cable tensioner 14 is in the load mode. At this time, the pilot pressure oil provided by the quantitative hydraulic pump 5 drives the first switch valve 21 (for example, a two-position two-way valve) to the disconnected state through ports 1 to 3 of the mode switching valve 16. At this time, the second oil port B of the hydraulic motor 13 can only be connected to the pilot relief valve 20, and the R port of the pilot relief valve 20 is connected to the hydraulic control relief valve 19 and the pressure gauge 18 through the second switch valve 17 (for example, a two-position two-way valve). Therefore, the hydraulic control relief valve 19 can remotely adjust the working pressure of the pilot relief valve 20. In the load mode, the hydraulic motor 13 is driven by the load cable to realize passive rotation, and the second oil port B of the hydraulic motor 13 is used as the oil outlet of the motor. The hydraulic relief valve 19 is used to adjust the actual set pressure of the pilot relief valve 20, which is also equivalent to the return oil back pressure of the hydraulic motor 13. The back pressure determines the size of the simulated load that the cable tensioner 14 can provide in the load mode, and its size is linearly proportional to the set pressure of the hydraulic relief valve 19. When the mode switching valve 16 is switched to the load mode, the state of the third switch valve 25 (for example, a two-position three-way valve) is switched to make the oil replenishment anti-shock relief valve 26 and the LS / A port of the hydraulic control reversing valve group in a connected state. The oil replenishment anti-shock relief valve 26 realizes the function of controlling the pressure of the first control end C1 of the hydraulic control reversing valve 81, and the pressure can be adjusted to be very low to meet the oil replenishment and anti-cavitation effect of the hydraulic motor 13 driven by the load to realize passive rotation.

[0089] There are a few points to note:

[0090] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0091] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0092] The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A hydraulic control system, comprising: A hydraulic motor, a hydraulic oil tank, and a quantitative hydraulic pump and a variable hydraulic pump connected to the hydraulic oil tank, wherein the hydraulic oil tank can contain liquid; as well as The valve body assembly includes a hydraulically controlled reversing valve group and a mode switching valve, wherein the hydraulically controlled reversing valve group includes a hydraulically controlled reversing valve; a first working end of the hydraulically controlled reversing valve is connected to the variable hydraulic pump; a first working end of the mode switching valve is connected to the quantitative hydraulic pump, and is configured such that when the mode switching valve is switched to a first conduction state, the variable hydraulic pump, the hydraulically controlled reversing valve and the hydraulic motor are connected to form a first oil supply circuit, The valve body assembly further comprises a pilot relief valve and a hydraulically controlled relief valve for controlling the working pressure of the pilot relief valve. When the mode switching valve is switched to the second conducting state, the hydraulic motor is connected to the pilot relief valve and the hydraulically controlled relief valve to form a second oil supply circuit. The valve body assembly also includes a second switch valve between the pilot relief valve and the hydraulically controlled relief valve. When the mode switching valve is switched to the second conduction state, the second switch valve is opened, and when the mode switching valve is switched to the first conduction state, the second switch valve is closed.

2. The hydraulic control system according to claim 1, wherein: The hydraulic motor has a first oil port and a second oil port, and the first oil port and the second oil port are connected to the second working end and the third working end of the hydraulic control reversing valve respectively. The valve body assembly also includes a selection handle valve group, which is connected to the quantitative hydraulic pump and has a first control valve and a second control valve. The first control valve and the second control valve are respectively connected to the first control end and the second control end of the hydraulically controlled reversing valve, and are configured to select the conduction state of the hydraulically controlled reversing valve, thereby controlling one of the first oil port and the second oil port to be an oil inlet and the other to be an oil outlet.

3. The hydraulic control system according to claim 2, wherein: The hydraulically controlled reversing valve group also includes two overflow valves, which are respectively configured to be connectable with the second working end and the third working end of the hydraulically controlled reversing valve to limit the pressure fed back to the variable hydraulic pump from the second working end and the third working end.

4. The hydraulic control system according to claim 3, wherein: A first shuttle valve is provided between the two relief valves and is configured to select the maximum pressure transmitted between the second working end and the third working end and return it to the variable hydraulic pump.

5. The hydraulic control system according to any one of claims 2 to 4, wherein: The valve body assembly also includes a first switch valve between the third working end of the hydraulically controlled reversing valve and the second oil port, which is configured such that when the mode switching valve is switched to a first conduction state, the first switch valve is opened, and when the mode switching valve is switched to a second conduction state, the first switch valve is closed.

6. The hydraulic control system according to claim 5, wherein: The mode switching valve includes a two-position four-way valve, the first switch valve includes a first two-position two-way valve, and the control end of the first two-position two-way valve is connected to the first working end of the mode switching valve to be controlled by the mode switching valve.

7. The hydraulic control system according to any one of claims 2 to 4, further comprising a brake, wherein: The valve body assembly also includes a brake valve and a second shuttle valve, and the brake valve is connected to the first control valve and the second control valve through the second shuttle valve, and is configured to control the brake locking target drive device when the first control valve and the second control valve are in a disconnected state, and control the brake releasing locking target drive device when the first control valve or the second control valve is in an open state.

8. The hydraulic control system according to any one of claims 2 to 4, wherein: The valve body assembly further includes an oil replenishment anti-surge valve group connecting the first oil port and the second oil port, wherein the oil replenishment anti-surge valve group is configured to supply oil to one of the first oil port and the second oil port.

9. The hydraulic control system according to claim 8, wherein: The oil replenishment anti-shock valve group includes a first one-way valve connected to the first oil port and a first overflow valve connected to the first one-way valve, and also includes a second one-way valve connected to the second oil port and a second overflow valve connected to the second one-way valve, and is configured so that the first oil port is an oil inlet and the second oil port is an oil outlet.

10. The hydraulic control system according to claim 1, wherein: The mode switching valve comprises a two-position four-way valve, the second switch valve comprises a second two-position two-way valve, and the control end of the second two-position two-way valve is connected to the second working end of the mode switching valve to be controlled by the mode switching valve.

11. The hydraulic control system according to claim 3, wherein: The valve body assembly also includes an oil replenishment anti-shock relief valve and a third switch valve, wherein a first working end of the oil replenishment anti-shock relief valve is connected to the hydraulic oil tank, a second working end of the oil replenishment anti-shock relief valve is connected to a first working end of the third switch valve, and a second working end of the third switch valve is connected to one of the two relief valves of the hydraulically controlled reversing valve group, and is configured such that when the third switch valve is in an open state, the oil replenishment anti-shock relief valve is connected to the first oil port through one of the two relief valves, and when the third switch valve is in a disconnected state, the oil replenishment anti-shock relief valve is disconnected from the first oil port.

12. The hydraulic control system according to claim 11, wherein: The control end of the third switch valve is connected to the mode switching valve, and is configured so that when the mode switching valve is switched to the second conduction state, the third switch valve is opened, and when the mode switching valve is switched to the first conduction state, the third switch valve is closed.

13. The hydraulic control system according to any one of claims 1 to 4, further comprising a first filter disposed between the hydraulic oil tank and the fixed displacement hydraulic pump and a second filter disposed between the hydraulic oil tank and the variable displacement hydraulic pump.

14. The hydraulic control system according to any one of claims 1 to 4, wherein: The quantitative hydraulic pump includes a gear pump or a vane pump; the variable hydraulic pump includes a load-sensitive control plunger pump or a pressure-compensated control plunger pump.

15. A cable tensioning system comprising: The hydraulic control system according to any one of claims 1 to 14, and The cable tensioner has a normal mode. When the mode switching valve of the hydraulic control system is switched to the first conduction state, the cable tensioner is in the normal mode. The cable tensioner can realize the functions of collecting and releasing the cable. Wherein, the valve body assembly of the hydraulic control system further includes a pilot relief valve and a hydraulically controlled relief valve for controlling the working pressure of the pilot relief valve, and when the mode switching valve is switched to the second conduction state, the hydraulic motor is connected with the pilot relief valve and the hydraulically controlled relief valve to form a second oil supply circuit; The cable tensioner also has a load mode. When the mode switching valve is switched to the second conduction state, the cable tensioner is in the load mode. The cable tensioner can realize a passive cable release function to simulate the load weight.

Images