CN113638924A

CN113638924A - Hydraulic system of wire saw and wire saw

Info

Publication number: CN113638924A
Application number: CN202111068523.6A
Authority: CN
Inventors: 徐丽宁; 张海波; 卓旺旺; 王体躲
Original assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Current assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2021-11-12
Also published as: WO2023035365A1

Abstract

The embodiment of the disclosure provides a hydraulic system of a wire saw and the wire saw. The hydraulic system of the rope saw comprises a hydraulic pump, a priority flow distribution valve, a first hydraulic motor, a second hydraulic motor and an oil drainage port. The priority flow distribution valve includes a first oil inlet, a first oil outlet and a second oil outlet, the first oil outlet is configured to output a constant flow, the second oil outlet is configured to output a remaining flow, the first oil inlet is connected to the hydraulic pump, the first oil outlet is connected to the second hydraulic motor, and the second oil outlet is connected to the first hydraulic motor. This rope saw's hydraulic system makes the flow of distributing to first hydraulic motor, second hydraulic motor and other executive component more stable through setting up preferential flow distribution valve to make the rope saw rotational speed stable, compare in current single pump drive hydraulic system, improved rope saw's cutting efficiency and operation security.

Description

Hydraulic system of wire saw and wire saw

Technical Field

Embodiments of the present disclosure relate to a hydraulic system of a wire saw and a wire saw.

Background

A wire saw is an apparatus for stringing high hardness particles (e.g., diamonds) into a wire saw, which is moved at a high speed to cut a work piece. The flexible mechanical cutting by adopting the rope saw is an efficient and precise cutting method, different materials such as rocks, concrete, steel and the like can be cut in the same cutting process, the operation is less influenced by environmental factors, and unique advantages are shown in the projects of crushing and cutting buildings, stone mining, waste material processing, dismantling reinforced concrete structures, marine structure maintenance and the like. The wire saw has the advantages of being simple in operation, low in environmental requirement, high in cutting efficiency, good in incision quality and the like, and the transformation cost of enterprises is greatly reduced.

The wire saw can be driven by electric or hydraulic means. Compared with a hydraulic type, under the same power, the saw head of the electric rope saw is higher in mass and volume, so that the saw head is drooping to enable the rope saw to shake more easily during cutting, and the electric rope saw is not suitable for the working condition of underwater cutting. Most of the existing hydraulic rope saws are hydraulic systems driven by a single pump, the stability of the flow of each actuating element (such as a cutting motor and a feeding motor) cannot be guaranteed, and the cutting motor flow is reduced and the cutting efficiency is reduced when a plurality of actuating elements work simultaneously by the rope saw. The existing hydraulic rope sawing machine is also provided with a hydraulic system driven by double pumps, and although the rotating speed of a cutting motor can be ensured not to be influenced by the actions of other executing elements, the two hydraulic pumps are required to work simultaneously, so that the cost of the hydraulic system and the arrangement difficulty of equipment and pipelines can be increased.

Disclosure of Invention

The embodiment of the disclosure provides a hydraulic system of a wire saw and the wire saw. The hydraulic system of the rope saw comprises a hydraulic pump, a priority flow distribution valve, a first hydraulic motor, a second hydraulic motor and an oil drainage port. The priority flow distribution valve includes a first oil inlet, a first oil outlet and a second oil outlet, the first oil outlet is configured to output a constant flow, the second oil outlet is configured to output a remaining flow, the first oil inlet is connected to the hydraulic pump, the first oil outlet is connected to the second hydraulic motor, and the second oil outlet is connected to the first hydraulic motor. This rope saw's hydraulic system makes the flow of distributing to first hydraulic motor, second hydraulic motor and other executive component more stable through setting up preferential flow distribution valve to make the rope saw rotational speed stable, compare in current single pump drive hydraulic system, improved rope saw's cutting efficiency and operation security. In addition, the hydraulic system of the rope saw is a single-pump driving hydraulic system, and compared with the existing double-pump driving hydraulic system, the cost of the hydraulic system and the arrangement difficulty of equipment and pipelines are reduced.

An embodiment of the present disclosure provides a hydraulic system of a wire saw, including a hydraulic pump, a priority flow distribution valve, a first hydraulic motor configured to drive a cutting device of the wire saw to move, a second hydraulic motor configured to drive a feeding device of the wire saw to move, and an oil drain port. The priority flow rate distribution valve includes a first oil inlet, a first oil outlet, and a second oil outlet, the first oil outlet is configured to output a constant flow rate, the second oil outlet is configured to output a remaining flow rate, the first oil inlet is connected to the hydraulic pump, the first oil outlet is connected to the second hydraulic motor, and the second oil outlet is connected to the first hydraulic motor.

In some examples, the hydraulic system further includes a flow regulating valve including a second oil inlet and a third oil outlet, the first oil outlet being connected to the second oil inlet, the third oil outlet being connected to the second hydraulic motor.

In some examples, the flow regulating valve further comprises a fourth oil outlet connected to the drain port.

In some examples, the hydraulic system further includes a first directional valve including a third oil inlet, a fifth oil outlet, a first working interface, and a second working interface, the first hydraulic motor includes a first interface and a second interface, the third oil inlet is connected to the second oil outlet, the first working interface is connected to the first interface, the second working interface is connected to the second interface, and the fifth oil outlet is connected to the oil drain.

In some examples, the first directional valve includes a first passage and a second passage, and a flow direction of hydraulic oil in the first passage sequentially passes through the third oil inlet, the first working interface, the first interface, the second working interface, and the fifth oil outlet; in the second passage, the flow direction of hydraulic oil sequentially passes through the third oil inlet, the second working interface, the second interface, the first working interface and the fifth oil outlet.

In some examples, the hydraulic system further includes a first relief valve having a first end connected between the second oil outlet and the third oil inlet, and a second end connected to the drain port.

In some examples, the hydraulic system further includes a second directional valve including a fourth oil inlet, a sixth oil outlet, a third work interface, and a fourth work interface, the second hydraulic motor including a third interface and a fourth interface, the fourth oil inlet connected to the third oil outlet, the third work interface connected to the third interface, the fourth work interface connected to the fourth interface, and the sixth oil outlet connected to the drain port.

In some examples, the second directional valve includes a third passage and a fourth passage, and in the third passage, a flow direction of hydraulic oil sequentially passes through the fourth oil inlet, the third working port, the third port, the fourth working port, and the sixth oil outlet; in the fourth passage, the flow direction of hydraulic oil sequentially passes through the fourth oil inlet, the fourth working interface, the fourth interface, the third working interface and the sixth oil outlet.

In some examples, the hydraulic system further includes a second spill valve and a shuttle valve, the shuttle valve includes a fifth oil inlet, a sixth oil inlet and a seventh oil outlet, the fifth oil inlet is connected between the third working port and the third port, the sixth oil inlet is connected between the fourth working port and the fourth port, the seventh oil outlet is connected to a first end of the second spill valve, a second end of the second spill valve is connected to the second port, and the shuttle valve is configured to compare pressures of the fifth oil inlet and the sixth oil inlet and communicate an oil inlet with a higher pressure therebetween with the seventh oil outlet, so that hydraulic oil with a higher pressure enters the second spill valve.

In some examples, the hydraulic system further includes a third hydraulic motor connected to the third oil outlet of the flow regulating valve and disposed in parallel with the second hydraulic motor.

In some examples, the hydraulic system further includes a third directional valve including a seventh oil inlet, an eighth oil outlet, a fifth work interface, and a sixth work interface, the third hydraulic motor includes a fifth interface and a sixth interface, the seventh oil inlet is connected to the third oil outlet, the fifth work interface is connected to the fifth interface, the sixth work interface is connected to the sixth interface, and the eighth oil outlet is connected to the drain port.

In some examples, the hydraulic system further includes a first hydraulic cylinder connected to the third oil outlet of the flow regulating valve and disposed in parallel with the second hydraulic motor.

In some examples, the hydraulic system further includes a fourth directional valve including an eighth oil inlet, a ninth oil outlet, a seventh work interface, and an eighth work interface, the first hydraulic cylinder includes a seventh interface and an eighth interface, the eighth oil inlet is connected to the third oil outlet, the seventh work interface is connected to the seventh interface, the eighth work interface is connected to the eighth interface, and the ninth oil outlet is connected to the drain port.

In some examples, the hydraulic system further includes a second hydraulic cylinder disposed in parallel with the first hydraulic cylinder, the second hydraulic cylinder including a ninth interface and a tenth interface, the seventh work interface being connected to the ninth interface, the eighth work interface being connected to the tenth interface.

In some examples, the hydraulic system further includes a flow divider valve including a first end, a second end, and a third end, the first end of the flow divider valve being connected to the eighth work interface, the second end of the flow divider valve being connected to the tenth interface of the second hydraulic cylinder, the third end of the flow divider valve being connected to the eighth interface of the first hydraulic cylinder, the flow divider valve being configured to fix a ratio of a flow of the first hydraulic cylinder and a flow of the second hydraulic cylinder.

In some examples, the hydraulic system further includes a balancing valve having a first end connected between the seventh work interface and the seventh interface of the first hydraulic cylinder or the ninth interface of the second hydraulic cylinder and a second end connected between the eighth work interface and the first end of the flow dividing valve, the balancing valve configured to balance a flow of the first hydraulic cylinder and a flow of the second hydraulic cylinder.

In some examples, the hydraulic system further comprises: a hydraulic oil tank; a filter connected between an inlet of the hydraulic pump and the hydraulic oil tank; and a third overflow valve, a first end of which is connected between the outlet of the hydraulic pump and the priority flow distribution valve, and a second end of which is connected to the hydraulic tank.

In some examples, the hydraulic system further includes a thermostat and a radiator, an inlet of the radiator is connected to the drain port, an outlet of the radiator is connected to the hydraulic oil tank, the thermostat includes a first inlet, a first outlet, and a second outlet, the first inlet is connected to the drain port, the first outlet is connected to the hydraulic oil tank, the second outlet is connected to the inlet of the radiator, and the radiator is configured to cool hydraulic oil; the thermostat has a set temperature, and when the temperature of the hydraulic oil is lower than the set temperature, the second outlet is closed, and the first outlet is opened; when the temperature of the hydraulic oil is greater than or equal to the set temperature, the first outlet is closed, and the second outlet is opened.

An embodiment of the present disclosure provides a wire saw, including a cutting device, a feeding device and the hydraulic system provided in any of the above embodiments, wherein the cutting device includes a wire saw configured to cut a work piece, the feeding device is configured to adjust a position of the wire saw, and the first hydraulic motor is connected to the cutting device; the second hydraulic motor is connected with the feeding device.

In some examples, the rope saw further comprises a bracket and a cutting angle adjustment device respectively connecting the bracket and the cutting device, the cutting angle adjustment device being configured to adjust an included angle between the cutting device and the bracket.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 is a schematic plan view of a wire saw according to an embodiment of the present disclosure;

FIG. 2 is a schematic three-dimensional view of a wire saw according to an embodiment of the present disclosure;

FIG. 3 is a schematic plan view of yet another rope saw according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of the principles and structure of a hydraulic system according to an embodiment of the present disclosure; and

fig. 5 is an enlarged view of the position of the dashed box in fig. 4.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The embodiment of the disclosure provides a hydraulic system of a wire saw and the wire saw. The hydraulic system of the rope saw comprises a hydraulic pump, a priority flow distribution valve, a first hydraulic motor, a second hydraulic motor and an oil drain opening, wherein the first hydraulic motor is configured to drive the cutting device of the rope saw to move, and the second hydraulic motor is configured to drive the feeding device of the rope saw to move. The priority flow distribution valve includes a first oil inlet, a first oil outlet and a second oil outlet, the first oil outlet is configured to output a constant flow, the second oil outlet is configured to output a remaining flow, the first oil inlet is connected to the hydraulic pump, the first oil outlet is connected to the second hydraulic motor, and the second oil outlet is connected to the first hydraulic motor.

This rope saw's hydraulic system makes the flow of distributing to first hydraulic motor, second hydraulic motor and other executive component more stable through setting up preferential flow distribution valve to make the rope saw rotational speed stable, compare in current single pump drive hydraulic system, improved rope saw's cutting efficiency and operation security. In addition, the hydraulic system of the rope saw is a single-pump driving hydraulic system, and compared with the existing double-pump driving hydraulic system, the cost of the hydraulic system and the arrangement difficulty of equipment and pipelines are reduced.

The hydraulic system of the wire saw and the wire saw provided by the embodiment of the disclosure are described in detail below with reference to the accompanying drawings.

An embodiment of the present disclosure provides a wire saw, where fig. 1 is a schematic plane structure diagram of the wire saw, and fig. 2 is a schematic three-dimensional structure diagram of the wire saw. As shown in fig. 1 and 2, the rope saw comprises a cutting device CD, a feed device FD and a hydraulic system for controlling the cutting device CD and the feed device FD. The cutting device CD comprises a wire saw CD1, the wire saw CD1 is configured to cut the work piece to be cut, the wire saw CD1 may be a diamond wire saw; the feed FD is configured to adjust the relative position between the wire saw CD1 and the work piece, i.e. the cutting position. The hydraulic system comprises a feed control system and a cutting control system. The feed control system comprises a feed motor connected with the feed FD to drive the feed FD to move, thereby adjusting the cutting position of the rope saw CD 1; the cutting control system includes a cutting motor coupled to the cutting device CD to drive the cutting device CD in motion to drive the cord saw CD1 to make a cut. For example, both the feed motor and the cutting motor are hydraulic motors. For example, the wire saw may be a diamond wire saw.

The rope saw provided by the embodiment of the disclosure can cut a to-be-cut object through the rope saw.

In some examples, as shown in fig. 1, the cutting device CD of the rope saw may include a driving wheel CD2 and a plurality of driven wheels CD3, the rope saw CD1 is wound around the driving wheel CD2 and the driven wheels CD3, the driving wheel CD2 is connected with a cutting motor (the cutting motor is not shown in fig. 1 and 2, and may be located below the driving wheel CD2 in fig. 1), and is driven by the cutting motor to rotate, so that the rope saw CD1 is driven to rotate in the clockwise direction or the counterclockwise direction in fig. 1. For example, in normal cutting operation of a wire saw, the wire saw CD1 rotates in a clockwise direction in fig. 1; in some special cases, such as when the rope saw is stuck during cutting, the rope saw CD1 may be rotated counterclockwise in fig. 1 to disengage from the stuck condition.

In some examples, as shown in fig. 2, the position of the dashed box F is the installation position of the feeding motor, and the feeding motor is connected with the gear transmission mechanism to drive the rope saw to move forward or backward.

As shown in fig. 2, the rope saw may further comprise a support S and a cutting angle adjusting device AD configured to adjust an angle between the cutting device CD and the support S. For example, the cutting angle adjusting device AD is respectively connected to the support S and the cutting device CD, and the included angle between the cutting device CD and the object to be cut can be adjusted by adjusting the included angle between the support S and the cutting device CD. For example, the cutting angle adjusting device AD can adjust the cutting angle by extending and retracting the hydraulic cylinder.

Fig. 3 is a schematic plan view of a further rope saw, which may also comprise a clamping device HD, as shown in fig. 3. For example, the clamping device HD may include two hydraulic cylinders HD1 and two jaws HD2, which can be extended and retracted to move the two jaws closer to or farther away from each other to clamp or release the work piece to be cut. Of course, the hydraulic cylinders and the jaws may be in other numbers, and the specific number of the hydraulic cylinders and the jaws is not limited in the disclosed embodiment.

In the rope sawing machine provided by the embodiment of the disclosure, each element of the hydraulic system is a hydraulic element and does not contain an electric element, so that the rope sawing machine is more suitable for underwater long-time operation, such as underwater pipeline cutting operation. Through setting up clamping device, can improve cutting accuracy and cutting stability, through setting up cutting angle adjusting device, can improve cutting scope and cutting flexibility.

An embodiment of the present disclosure provides a hydraulic system for driving the above rope saw, and fig. 4 is a schematic diagram of the hydraulic system. As shown in fig. 4, the hydraulic system includes a hydraulic pump 2, a priority flow rate distribution valve 6, a first hydraulic motor 9, a second hydraulic motor 10, and a drain port D. The first hydraulic motor 9 is configured to drive the cutting device CD of the rope saw in motion and the second hydraulic motor 10 is configured to drive the feed device FD of the rope saw in motion. The priority flow rate distribution valve 6 includes a first oil inlet 61, a first oil outlet 62, and a second oil outlet 63, the first oil outlet 62 being configured to output a constant flow rate, and the second oil outlet 63 being configured to output the remaining flow rate. A first oil inlet 61 of the priority flow rate distribution valve 6 is connected to the hydraulic pump 2, a first oil outlet 62 of the priority flow rate distribution valve 6 is connected to the second hydraulic motor 10, and a second oil outlet 63 of the priority flow rate distribution valve 6 is connected to the first hydraulic motor 9.

For example, the hydraulic pump 2 may be a variable displacement plunger pump, a fixed displacement pump, a pressure cutoff pump, a load-sensitive pump, or the like, and the output flow rate thereof may be adjusted by adjusting the engine speed.

For example, the first hydraulic motor 9 is the above-mentioned cutting motor configured to drive the wire saw in rotation; the second hydraulic motor 10 is the above-mentioned feed motor configured to drive the wire saw closer to or away from the work piece.

For example, the operating pressure of the first hydraulic motor 9 is higher than the operating pressure of the second hydraulic motor 10. Embodiments of the present disclosure include, but are not limited to, this.

When the first hydraulic motor 9 and the second hydraulic motor 10 are simultaneously operated, the priority flow distribution valve 6 can divide the flow delivered by the hydraulic pump 2 into a specified flow, and then the specified flow flows out from the first oil outlet 62 (which can also be called as a priority port) and then enters the second hydraulic motor 10 to drive the feed device FD to move; the remaining flow is discharged from the second outlet port 63 and then into the first hydraulic motor 9 to drive the cutting device CD in motion. In this way, the flow rate of the second hydraulic motor 10 is stable, and the flow rate entering the first hydraulic motor 9 is the flow rate at the outlet of the hydraulic pump 2 minus the flow rate from the first oil outlet 62, which can be controlled by adjusting the output flow rate of the hydraulic pump 2, so that the first hydraulic motor 9 and the second hydraulic motor 10 can both obtain the required and continuous flow rate with stable pressure.

In the hydraulic system that this disclosed embodiment provided, through setting up preferential flow distribution valve, make the flow of distributing to first hydraulic motor, second hydraulic motor and other executive component more stable to make rope saw rotational speed stable, compare in current single pump drive hydraulic system, improved the cutting efficiency, cutting accuracy and the operation security of rope saw machine. In addition, the hydraulic system of the rope saw is a single-pump driving hydraulic system, and compared with the existing double-pump driving hydraulic system, the cost of the hydraulic system and the arrangement difficulty of equipment and pipelines are reduced.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system further including a flow regulating valve 18. Flow control valve 18 includes a second oil inlet 181 and a third oil outlet 182. The first oil outlet 62 of the priority flow rate distribution valve 6 is connected to the second oil inlet 181 of the flow rate adjustment valve 18, and the third oil outlet 182 of the flow rate adjustment valve 18 is connected to the second hydraulic motor 10. The flow regulating valve 18 further includes a fourth oil outlet 183, and the fourth oil outlet 183 is connected to the drain port D.

The third outlet port 182 of the flow control valve 18 may also be connected to other hydraulic components, such as a third hydraulic motor, a hydraulic cylinder, etc., which may be arranged in parallel with the second hydraulic motor 10, as will be described in detail later.

By providing the flow rate adjustment valve 18, the flow rate of the hydraulic oil flowing from the first oil outlet 62 of the priority flow rate distribution valve 6 to the second hydraulic motor 10 or other hydraulic components can be reduced according to actual needs. Through setting up preferential flow distribution valve 6 and flow control valve 18, can make the flow of distributing to first hydraulic motor, second hydraulic motor and other executive component more stable to make the rope saw rotate and feed more stable, improved the cutting efficiency, the cutting precision and the operation security of rope saw.

In some examples, as shown in fig. 4, the hydraulic system provided by the embodiment of the present disclosure further includes a first direction valve 8, and the first hydraulic motor 9 is connected to the priority flow distributing valve 6 through the first direction valve 8. The first direction valve 8 comprises a third oil inlet 81, a fifth oil outlet 82, a first working interface 83 and a second working interface 84. The first hydraulic motor 9 comprises a first connection 91 and a second connection 92. The third oil inlet 81 of the first direction valve 8 is connected to the second oil outlet 63 of the priority flow distributing valve 6, the first working port 83 of the first direction valve 8 is connected to the first port 91 of the first hydraulic motor 9, the second working port 84 of the first direction valve 8 is connected to the second port 92 of the first hydraulic motor 9, and the fifth oil outlet 82 of the first direction valve 8 is connected to the oil drain port D.

For example, the first direction valve 8 includes a first passage and a second passage. In the first passage, the hydraulic oil flows in the direction of sequentially passing through the third oil inlet 81, the first working interface 83, the first interface 91, the second interface 92, the second working interface 84 and the fifth oil outlet 82; in the second passage, the flow direction of the hydraulic oil sequentially passes through the third oil inlet 81, the second working port 84, the second port 92, the first port 91, the first working port 83, and the fifth oil outlet 82.

For example, the first direction valve 8 may be a manual direction valve, which also includes an open position. When the reversing valve is in the open position, the reversing valve is closed, and all the passages cannot be communicated. The operator can push the handle of the first direction valve 8 to change the direction, so that the first direction valve 8 can be switched between the first passage, the second passage or the disconnection position. Of course, the first direction valve 8 may also include more passages, which is not limited by the disclosed embodiment. For example, the first direction valve 8 may also be a hydraulic direction valve.

The first direction valve 8 is used to control the direction change of the first hydraulic motor 9, and the directions of rotation of the first hydraulic motor 9 are opposite to each other in the case where the first passage is open and in the case where the second passage is open. For example, when the first passage is opened, the first hydraulic motor 9 is rotated in the clockwise direction in the drawing to drive the rope saw to rotate clockwise; when the second passage is opened, the first hydraulic motor 9 rotates counterclockwise in the drawing to drive the wire saw to rotate counterclockwise; when both the first passage and the second passage are closed, the first hydraulic motor 9 stops rotating. For example, during normal cutting operations, the first path is closed and the wire saw is rotated clockwise; under special conditions such as excessive resistance, the second path is connected, and the rope saw rotates anticlockwise. Thus, the rope saw can realize normal cutting or reverse rotation when encountering obstacles. Of course, when the first passage is opened, the first hydraulic motor 9 may be rotated counterclockwise in the drawing; when the second passage is opened, the first hydraulic motor 9 rotates in the clockwise direction in the drawing; when both the first passage and the second passage are closed, the first hydraulic motor 9 stops rotating.

In some examples, as shown in fig. 4, the hydraulic system provided by the embodiment of the present disclosure further includes a first relief valve 7. The first end 71 of the first spill valve 7 is connected between the second oil outlet 63 of the priority flow distribution valve 6 and the third oil inlet 81 of the first selector valve 8, and the second end 72 of the first spill valve 7 is connected to the drain port D. The first relief valve 7 is configured to relieve hydraulic oil to the drain port D when the pressure or flow output from the second oil outlet 63 of the priority flow distribution valve 6 is excessively high, thereby providing overpressure protection to the first directional valve 8 and the first hydraulic motor 9. For example, the first relief valve 7 has a pressure threshold value, and opens when the pressure at both ends is greater than the pressure threshold value, thereby reducing the pressure at both ends; when the pressure is smaller than or equal to the pressure critical value, the first overflow valve is closed, and the pressure critical value can be set according to actual requirements.

In some examples, as shown in fig. 4, the hydraulic system provided by the embodiment of the present disclosure further includes a second direction valve 17, and the second hydraulic motor 10 is connected to the flow distribution valve 18 through the second direction valve 17. The second direction valve 17 comprises a fourth oil inlet 171, a sixth oil outlet 172, a third working port 173 and a fourth working port 174; the second hydraulic motor 10 includes a third port 101 and a fourth port 102. The fourth oil inlet 171 of the second direction valve 17 is connected to the third oil outlet 182 of the flow control valve 18, the third working port 173 of the second direction valve 17 is connected to the third port 101 of the second hydraulic motor 10, the fourth working port 174 of the second direction valve 17 is connected to the fourth port 102 of the second hydraulic motor 10, and the sixth oil outlet 172 of the second direction valve 17 is connected to the drain port D.

For example, the second direction valve 17 includes a third passage and a fourth passage. In the third passage, the flow direction of the hydraulic oil sequentially passes through a fourth oil inlet 171, a third working port 173, a third port 101, a fourth port 102, a fourth working port 174 and a sixth oil outlet 172; in the fourth passage, the hydraulic oil flows in the direction of passing through the fourth oil inlet 171, the fourth working port 174, the fourth port 102, the third port 101, the third working port 173, and the sixth oil outlet 172 in sequence.

For example, the second direction valve 17 may be a manual direction valve, which also includes an open position. When the reversing valve is in the open position, the reversing valve is closed, and all the passages cannot be communicated. The operator can push the handle of the second direction valve 17 to change the direction, so that the second direction valve 17 can be switched between the third passage, the fourth passage or the disconnection position. Of course, the second direction valve 17 may also include more passages, which is not limited by the disclosed embodiment. For example, the second direction valve 17 may also be a hydraulic direction valve.

The second direction change valve 17 is used to control the direction change of the second hydraulic motor 10, and the rotation directions of the second hydraulic motor 10 are opposite to each other in the case where the third passage is opened and in the case where the fourth passage is opened. For example, when the third path is opened, the second hydraulic motor 10 is rotated in a clockwise direction in the drawing to drive the wire saw close to the work piece; when the fourth path is opened, the second hydraulic motor 10 is rotated counterclockwise in the drawing to drive the wire saw away from the work piece to be cut; when both the third passage and the fourth passage are closed, the second hydraulic motor 10 stops rotating. Of course, it is also possible that, when the third path is opened, the second hydraulic motor 10 is rotated in the counterclockwise direction in the drawing to drive the wire saw close to the work piece; when the fourth path is opened, the second hydraulic motor 10 rotates clockwise in the drawing to drive the wire saw away from the work piece to be cut; when both the third passage and the fourth passage are closed, the second hydraulic motor 10 stops rotating. In this way, the advance, retreat or stop of the wire saw can be realized.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system that further includes a second spill valve 15 and a shuttle valve 16. Shuttle valve 16 includes a fifth oil inlet 161, a sixth oil inlet 162, and a seventh oil outlet 163. The fifth oil inlet 161 of the shuttle valve 16 is connected between the third working port 173 of the second direction valve 17 and the third port 101 of the second hydraulic motor 10, the sixth oil inlet 162 of the shuttle valve 16 is connected between the fourth working port 174 of the second direction valve 17 and the fourth port 102 of the second hydraulic motor 10, the seventh oil outlet 163 of the shuttle valve 16 is connected to the first end 151 of the second relief valve 15, and the second end 152 of the second relief valve 15 is connected to the drain port D.

The shuttle valve 16 is configured to compare pressures of the fifth oil inlet 161 and the sixth oil inlet 162, communicate the oil inlet with a higher pressure between the fifth oil inlet and the sixth oil inlet with the seventh oil outlet 163, so that hydraulic oil with a higher pressure enters the second relief valve 15, and the hydraulic oil is regulated by the second relief valve 15 and then enters the second hydraulic motor 10 to control the forward or backward movement of the rope saw. The second relief valve 15 is configured to relieve hydraulic oil to the drain port D when the pressure or flow output from the seventh oil outlet 163 of the shuttle valve 16 is excessively high, thereby providing overpressure protection to the second hydraulic motor 10.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system further including a third hydraulic motor 13. The third hydraulic motor 13 is connected to the third oil outlet 182 of the flow rate regulation valve 18, and is provided in parallel with the second hydraulic motor 10. The third hydraulic motor 13 is arranged in parallel with the second hydraulic motor 10, that is, the hydraulic oil of the third hydraulic motor 13 and the hydraulic oil of the second hydraulic motor 10 both come from the flow regulating valve 18 and return to the oil drain port D, and the hydraulic oil paths of the third hydraulic motor 13 and the hydraulic oil paths of the second hydraulic motor 10 are independent of each other.

In some examples, as shown in fig. 4, the hydraulic system provided by the embodiment of the present disclosure further includes a third direction valve 20, and the third hydraulic motor 13 may be connected to the third oil outlet 182 of the flow regulating valve 18 through the third direction valve 20. The third reversing valve 20 comprises a seventh oil inlet 201, an eighth oil outlet 202, a fifth working interface 203 and a sixth working interface 204; the third hydraulic motor 13 comprises a fifth connection 131 and a sixth connection 132. A seventh oil inlet 201 of the third reversing valve 20 is connected to the third oil outlet 182 of the flow distributing valve 18, a fifth working interface 203 of the third reversing valve 20 is connected to the fifth interface 131 of the third hydraulic motor 13, a sixth working interface 204 of the third reversing valve 20 is connected to the sixth interface 132 of the third hydraulic motor 13, and an eighth oil outlet 202 of the third reversing valve 20 is connected to the drain port D.

For example, the third direction valve 20 includes a fifth passage and a sixth passage. In the fifth passage, the hydraulic oil flows in the direction of sequentially passing through the seventh oil inlet 201, the fifth working port 203, the fifth port 131, the sixth working port 204, the sixth port 132 and the eighth oil outlet 202; in the sixth passage, the hydraulic oil flows in the direction of passing through the seventh oil inlet 201, the sixth working port 204, the sixth port 132, the fifth port 131, the fifth working port 203, and the eighth oil outlet 202 in sequence.

For example, the third directional valve 20 may be a manual directional valve that also includes an open position. When the reversing valve is in the open position, the reversing valve is closed, and all the passages cannot be communicated. The operator can push the handle of the third direction valve 20 to change the direction, so that the third direction valve 20 can be switched between the fifth passage, the sixth passage or the disconnection position. Of course, the third directional valve 20 may also include more passages, which is not limited by the disclosed embodiment. For example, the third directional valve 20 may also be a hydraulic directional valve.

For example, the hydraulic components of the hydraulic system provided by the embodiments of the present disclosure are connected by hydraulic lines. For example, the rope saw further comprises a drum for winding the hydraulic lines of the hydraulic system. The third hydraulic motor 13 is used to drive the drum in rotation to wind the hydraulic lines. Of course, the third hydraulic motor 13 may also be used to drive other functional elements, including but not limited to this, embodiments of the present disclosure.

The third direction valve 20 is used to control the direction of the third hydraulic motor 13 to drive the drum in rotation to take up or release the hydraulic lines. The rotation directions of the third hydraulic motor 13 are opposite to each other in the case where the fifth passage is open and in the case where the sixth passage is open. For example, when the fifth passage is opened, the third hydraulic motor 13 is rotated in the clockwise direction in the drawing to tighten the hydraulic lines; when the sixth passage is opened, the third hydraulic motor 13 is rotated in the counterclockwise direction in the drawing to release the hydraulic line; when the fifth passage and the sixth passage are both closed, the third hydraulic motor 13 stops rotating. Of course, it is also possible that, when the fifth passage is opened, the third hydraulic motor 13 is rotated in the counterclockwise direction in the drawing to tighten the hydraulic lines; when the sixth passage is opened, the third hydraulic motor 13 is rotated in the clockwise direction in the drawing to release the hydraulic line.

For example, the hydraulic circuit of the third hydraulic motor 13 may also be provided with a second shuttle valve 23 and a fourth spill valve 24 connected. The second shuttle valve 23 and the fourth spill valve 24 are connected in the hydraulic line of the third hydraulic motor 13 in a similar manner to the shuttle valve 16 and the second spill valve 15 in the hydraulic line of the second hydraulic motor 10 and will not be described in detail here.

The second shuttle valve 23 is configured to compare pressures of the fifth working port 203 and the sixth working port 204, communicate a working port having a higher pressure therebetween with the fourth relief valve 24, and regulate pressure of hydraulic oil passing through the fourth relief valve 24 and then enter the third hydraulic motor 13. The fourth spill valve 24 is configured to drain hydraulic oil to the drain port D when the pressure or flow output by the fifth work interface 203 or the sixth work interface 204 is too high, thereby providing overpressure protection for the third hydraulic motor 13.

For example, the third hydraulic motor 13 and the second hydraulic motor 10 do not operate simultaneously, and this can be achieved by controlling the second direction valve 17 and the third direction valve 20 to communicate simultaneously.

In some examples, as shown in fig. 4, the hydraulic system provided by the embodiment of the present disclosure further includes a first hydraulic cylinder 11a connected to the third oil outlet 182 of the flow rate regulation valve 18 and disposed in parallel with the second hydraulic motor 10.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system further including a fourth directional valve 21. Fig. 5 is an enlarged view of the dashed box locations in fig. 4 to more clearly show the respective interfaces of the second direction valve 17, the third direction valve 20 and the fourth direction valve 21.

As shown in fig. 4 and 5, the fourth direction valve 21 includes an eighth oil inlet 211, a ninth oil outlet 212, a seventh working port 213, and an eighth working port 214. The first hydraulic cylinder 11a includes a seventh port 11a1 and an eighth port 11a 2. The eighth oil inlet 211 of the fourth direction valve 21 is connected to the third oil outlet 182 of the flow regulating valve 18, the seventh working port 213 of the fourth direction valve 21 is connected to the seventh port 11a1 of the first hydraulic cylinder 11a, the eighth working port 214 of the fourth direction valve 21 is connected to the eighth port 11a2 of the first hydraulic cylinder 11a, and the ninth oil outlet 212 of the fourth direction valve 21 is connected to the oil drain D.

For example, the fourth direction valve 21 includes a seventh passage and an eighth passage. In the seventh passage, the hydraulic oil flows in the direction of sequentially passing through the eighth oil inlet 211, the seventh working port 213, the seventh port 11a1, the eighth working port 214, the eighth port 11a2 and the ninth oil outlet 212; in the eighth passage, the hydraulic oil flows in the eighth oil inlet 211, the eighth working port 214, the eighth port 11a2, the seventh port 11a1, the seventh working port 213, and the ninth oil outlet 212 in sequence.

For example, the fourth direction valve 21 may be a manual direction valve, which also includes an open position. When the reversing valve is in the open position, the reversing valve is closed, and all the passages cannot be communicated. The operator can push the handle of the fourth direction valve 21 to change the direction, so that the fourth direction valve 21 can be switched between the seventh passage, the eighth passage or the disconnection position. Of course, the fourth direction valve 21 may also include more passages, which is not limited by the embodiment of the disclosure. For example, the fourth direction valve 21 may also be a hydraulic direction valve.

For example, as shown in fig. 3, the first hydraulic cylinder 11a may be one of the hydraulic cylinders HD1 that drives the clamp device HD for driving the jaw HD2 to move. For another example, as shown in fig. 2, the first hydraulic cylinder 11a may be used to drive the cutting angle adjusting device AD. Alternatively, the first hydraulic cylinder 11a may be used to drive other functional elements.

The fourth direction switching valve 21 is used to control the extension and contraction of the first hydraulic cylinder 11 a. For example, when the seventh passage is opened, the first hydraulic cylinder 11a is extended; when the eighth passage is opened, the first hydraulic cylinder 11a is shortened; when both the seventh passage and the eighth passage are closed, the first hydraulic cylinder 11a is stopped. Of course, when the seventh passage is opened, the first hydraulic cylinder 11a may be shortened; when the eighth passage is opened, the first hydraulic cylinder 11a extends.

For example, the hydraulic line of the first hydraulic cylinder 11a may be provided with the third shuttle valve 25 and the fifth relief valve 26 connected. The third shuttle valve 25 and the fifth relief valve 26 are connected in the hydraulic line of the first hydraulic cylinder 11a in a similar manner to the shuttle valve 16 and the second relief valve 15 in the hydraulic line of the second hydraulic motor 10, and will not be described in detail here.

The third shuttle valve 25 is configured to compare the pressures of the seventh working port 213 and the eighth working port 214, communicate the working port having the higher pressure of the two with the fifth relief valve 26, and regulate the pressure of the hydraulic oil passing through the fifth relief valve 26 and then enter the first hydraulic cylinder 11 a. The fifth relief valve 26 is configured to release the hydraulic oil to the drain port D when the pressure or the flow output from the seventh work port 213 or the eighth work port 214 is excessively high, thereby providing overpressure protection to the first hydraulic cylinder 11 a.

For example, when at most one of the first hydraulic cylinder 11a, the third hydraulic motor 13, and the second hydraulic motor 10 is in operation at the same time, the second direction valve 17, the third direction valve 20, and the fourth direction valve 21 may be controlled to be not communicated simultaneously.

In some examples, as shown in fig. 4 and 5, the hydraulic system provided by the embodiment of the present disclosure further includes a second hydraulic cylinder 11b disposed in parallel with the first hydraulic cylinder 11 a. The second hydraulic cylinder 11b includes a ninth port 11b1 and a tenth port 11b2, the seventh working port 213 of the fourth direction valve 21 is connected to the ninth port 11b1 of the second hydraulic cylinder 11b, and the eighth working port 214 of the fourth direction valve 21 is connected to the tenth port 11b2 of the second hydraulic cylinder 11 b.

The second hydraulic cylinder 11b and the first hydraulic cylinder 11a have the fourth direction switching valve 21 as a direction switching switch, and both can be operated simultaneously.

For example, as shown in fig. 3, the second hydraulic cylinder 11b may also be one of the hydraulic cylinders HD1 of the driving clamp device HD for driving the movement of the jaws HD 2. For another example, as shown in fig. 2, the second hydraulic cylinder 11b may be used to drive the cutting angle adjusting device AD. Alternatively, the second hydraulic cylinder 11b may be used to drive other functional elements.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system further including a diverter valve 12. As shown in fig. 4 and 5, the flow dividing valve 12 includes a first end 121, a second end 122 and a third end 123, the first end 121 of the flow dividing valve 12 is connected to the eighth working port 214 of the fourth direction valve 21, the second end 122 of the flow dividing valve 12 is connected to the tenth port 11b2 of the second hydraulic cylinder 11b, and the third end 123 of the flow dividing valve 12 is connected to the eighth port 11a2 of the first hydraulic cylinder 11 a.

The flow dividing valve 12 is connected to the hydraulic lines of the first hydraulic cylinder 11a and the second hydraulic cylinder 11b, and is configured to fix the ratio of the flow rate of the first hydraulic cylinder 11a to the flow rate of the second hydraulic cylinder 11b, for example, to make the flow rate of the first hydraulic cylinder 11a and the flow rate of the second hydraulic cylinder 11b the same. By arranging the flow dividing valve 12, the synchronous or proportional movement of the first hydraulic cylinder 11a and the second hydraulic cylinder 11b can be ensured, and the movement accuracy of the actuating element is improved. For example, when the first hydraulic cylinder 11a and the second hydraulic cylinder 11b are respectively used as two hydraulic cylinders HD1 for driving the jaws HD2 of the clamping device HD to move, the two hydraulic cylinders are synchronously moved to make the two jaws simultaneously move close to or away from each other, thereby improving the clamping effect. For another example, when the first hydraulic cylinder 11a and the second hydraulic cylinder 11b are respectively used to drive the cutting angle adjusting device AD, the synchronous movement of the two can improve the cutting angle adjusting accuracy.

For example, the hydraulic system provided by the embodiment of the present disclosure may further include a greater number of hydraulic cylinders, which are arranged in parallel with the first hydraulic cylinder 11a and the second hydraulic cylinder 11b, and together use the fourth directional valve 21 as a directional switch, and the hydraulic cylinders may operate simultaneously.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system further including a balancing valve 14. The first end 141 of the balancing valve 14 is connected between the seventh working interface 213 of the fourth direction valve 21 and the seventh interface 11a1 of the first hydraulic cylinder 11a or the ninth interface 11b1 of the second hydraulic cylinder 11b, and the second end 142 of the balancing valve 14 is connected between the eighth working interface 214 of the fourth direction valve 21 and the first end 121 of the dividing valve 12.

The balance valve 14 is configured to balance the flow rate of the first hydraulic cylinder 11a and the flow rate of the second hydraulic cylinder 11 b. The first hydraulic cylinder 11a and the second hydraulic cylinder 11b are affected by a load during operation, and thus generate a pressure change, which may cause malfunction of the hydraulic cylinders. The balance valve 14 can reduce or remove pressure variation caused by a load, thereby preventing malfunction of the first hydraulic cylinder 11a and the second hydraulic cylinder 11 b.

For example, the hydraulic system provided in the embodiment of the present disclosure may further include other functional components, and the other functional components may be disposed in parallel with the hydraulic lines of the second hydraulic motor 10, the third hydraulic motor 13, and the first hydraulic cylinder 11a and the second hydraulic cylinder 11b to implement other functions.

In some examples, as shown in fig. 4, the hydraulic system provided by the embodiment of the present disclosure further includes a hydraulic oil tank 22, a filter 1, and a third relief valve 3. The filter 1 is connected between the inlet of the hydraulic pump 2 and the hydraulic oil tank 22; the first end 31 of the third relief valve 3 is connected between the outlet of the hydraulic pump and the priority flow distribution valve 6, and the second end 32 of the third relief valve 3 is connected to the hydraulic oil tank 22. The filter 1 is used for filtering out impurities in the hydraulic oil. The third relief valve 3 is configured to relieve the hydraulic oil to the drain port D when the pressure or flow output from the hydraulic pump 2 is excessively high, thereby providing overpressure protection to elements at the rear end of the hydraulic system, such as the priority flow distribution valve 6.

In some examples, as shown in fig. 4, the hydraulic system further comprises a pressure gauge 4 connected to an outlet of the hydraulic pump 2 for measuring an output pressure of the hydraulic pump 2.

In some examples, as shown in fig. 4, embodiments of the present disclosure provide a hydraulic system further including a thermostat 5 and a radiator 19. The inlet of the radiator 19 is connected to the drain port D, and the outlet of the radiator is connected to the hydraulic oil tank 22. The thermostat 5 includes a first inlet a, a first outlet B and a second outlet C. A first inlet a of the thermostat 5 is connected to the drain D, a first outlet B of the thermostat 5 is connected to the hydraulic oil tank 22, and a second outlet C of the thermostat 5 is connected to an inlet of the radiator 19. The radiator 19 is configured to cool the hydraulic oil. The thermostat 5 has a set temperature, when the temperature of the hydraulic oil is lower than the set temperature, the second outlet C is closed, the first outlet B is opened, and the hydraulic oil entering from the oil drain port D can directly enter the hydraulic oil tank 22; when the temperature of the hydraulic oil is greater than or equal to the set temperature, the first outlet B is closed, the second outlet C is opened, and the hydraulic oil entering from the oil drain port D is cooled by the radiator 19 and then enters the hydraulic oil tank 22. By arranging the thermostat and the radiator, the temperature of the hydraulic oil which flows back to the hydraulic oil tank can be ensured not to be too high.

The following points need to be explained:

(1) in the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are referred to, and other structures may refer to general designs.

(2) Features of the disclosure in the same embodiment and in different embodiments may be combined with each other without conflict.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and shall be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A hydraulic system of a wire saw includes a hydraulic pump, a priority flow distributing valve, a first hydraulic motor configured to drive a cutting device of the wire saw to move, a second hydraulic motor configured to drive a feeding device of the wire saw to move, and a drain port,

wherein the priority flow distribution valve includes a first oil inlet, a first oil outlet, and a second oil outlet, the first oil outlet configured to output a constant flow, the second oil outlet configured to output a remaining flow, the first oil inlet connected to the hydraulic pump, the first oil outlet connected to the second hydraulic motor, and the second oil outlet connected to the first hydraulic motor.

2. The hydraulic system of claim 1, further comprising a flow regulating valve, wherein the flow regulating valve includes a second oil inlet and a third oil outlet, the first oil outlet being connected to the second oil inlet, the third oil outlet being connected to the second hydraulic motor.

3. The hydraulic system of claim 2, wherein the flow regulating valve further includes a fourth oil outlet connected to the drain port.

4. The hydraulic system of claim 1, further comprising a first directional valve, wherein the first directional valve includes a third oil inlet, a fifth oil outlet, a first working interface, and a second working interface, the first hydraulic motor includes a first interface and a second interface, the third oil inlet is connected to the second oil outlet, the first working interface is connected to the first interface, the second working interface is connected to the second interface, and the fifth oil outlet is connected to the oil drain.

5. The hydraulic system of claim 4, wherein the first directional valve comprises a first passage and a second passage, and a flow direction of hydraulic oil in the first passage sequentially passes through the third oil inlet, the first working port, the first port, the second working port, and the fifth oil outlet; in the second passage, the flow direction of hydraulic oil sequentially passes through the third oil inlet, the second working interface, the second interface, the first working interface and the fifth oil outlet.

6. The hydraulic system of claim 4, further comprising a first spill valve, wherein a first end of the first spill valve is connected between the second oil outlet and the third oil inlet, and a second end of the first spill valve is connected to the drain port.

7. The hydraulic system of claim 2, further comprising a second directional valve, wherein the second directional valve includes a fourth oil inlet, a sixth oil outlet, a third work interface, and a fourth work interface, the second hydraulic motor includes a third interface and a fourth interface, the fourth oil inlet is connected to the third oil outlet, the third work interface is connected to the third interface, the fourth work interface is connected to the fourth interface, and the sixth oil outlet is connected to the drain port.

8. The hydraulic system of claim 7, wherein the second directional valve includes a third passage and a fourth passage, and in the third passage, hydraulic oil flows in a direction sequentially through the fourth oil inlet, the third working port, the third port, the fourth working port, and the sixth oil outlet; in the fourth passage, the flow direction of hydraulic oil sequentially passes through the fourth oil inlet, the fourth working interface, the fourth interface, the third working interface and the sixth oil outlet.

9. The hydraulic system of claim 7, further comprising a second spill valve and a shuttle valve, wherein the shuttle valve includes a fifth oil inlet, a sixth oil inlet, and a seventh oil outlet, the fifth oil inlet is connected between the third working port and the third port, the sixth oil inlet is connected between the fourth working port and the fourth port, the seventh oil outlet is connected to a first end of the second spill valve, a second end of the second spill valve is connected to the drain port, and the shuttle valve is configured to compare pressures of the fifth oil inlet and the sixth oil inlet and communicate a higher pressure oil inlet therebetween with the seventh oil outlet, such that a higher pressure hydraulic oil enters the second spill valve.

10. The hydraulic system of claim 2, further comprising a third hydraulic motor connected to the third oil outlet of the flow regulating valve and disposed in parallel with the second hydraulic motor.

11. The hydraulic system of claim 10, further comprising a third directional valve, wherein the third directional valve includes a seventh oil inlet, an eighth oil outlet, a fifth work interface, and a sixth work interface, the third hydraulic motor includes a fifth interface and a sixth interface, the seventh oil inlet is connected to the third oil outlet, the fifth work interface is connected to the fifth interface, the sixth work interface is connected to the sixth interface, and the eighth oil outlet is connected to the drain port.

12. The hydraulic system of claim 2, further comprising a first hydraulic cylinder connected to the third oil outlet of the flow control valve and disposed in parallel with the second hydraulic motor.

13. The hydraulic system of claim 12, further comprising a fourth directional valve, wherein the fourth directional valve includes an eighth oil inlet, a ninth oil outlet, a seventh work interface, and an eighth work interface, the first hydraulic cylinder includes a seventh interface and an eighth interface, the eighth oil inlet is connected to the third oil outlet, the seventh work interface is connected to the seventh interface, the eighth work interface is connected to the eighth interface, and the ninth oil outlet is connected to the drain port.

14. The hydraulic system of claim 13, further comprising a second hydraulic cylinder disposed in parallel with the first hydraulic cylinder, wherein the second hydraulic cylinder includes a ninth interface and a tenth interface, the seventh work interface being connected to the ninth interface, the eighth work interface being connected to the tenth interface.

15. The hydraulic system of claim 14, further comprising a flow divider valve, wherein the flow divider valve includes a first end, a second end, and a third end, the first end of the flow divider valve being connected to the eighth work interface, the second end of the flow divider valve being connected to the tenth interface of the second hydraulic cylinder, the third end of the flow divider valve being connected to the eighth interface of the first hydraulic cylinder, the flow divider valve being configured to fix a ratio of the flow of the first hydraulic cylinder to the flow of the second hydraulic cylinder.

16. The hydraulic system of claim 15, further comprising a balancing valve, wherein a first end of the balancing valve is connected between the seventh work interface and the seventh interface of the first hydraulic cylinder or the ninth interface of the second hydraulic cylinder, a second end of the balancing valve is connected between the eighth work interface and the first end of the flow dividing valve, the balancing valve configured to balance the flow of the first hydraulic cylinder and the flow of the second hydraulic cylinder.

17. The hydraulic system of any one of claims 1-16, further comprising:

a hydraulic oil tank;

a filter connected between an inlet of the hydraulic pump and the hydraulic oil tank; and

a third overflow valve, a first end of which is connected between the outlet of the hydraulic pump and the priority flow distribution valve, and a second end of which is connected to the hydraulic tank.

18. The hydraulic system of claim 17, further comprising a thermostat and a radiator, wherein an inlet of the radiator is connected to the drain port and an outlet of the radiator is connected to the hydraulic tank, the thermostat including a first inlet connected to the drain port, a first outlet connected to the hydraulic tank, and a second outlet connected to an inlet of the radiator, the radiator configured to cool hydraulic oil; the thermostat has a set temperature, and when the temperature of the hydraulic oil is lower than the set temperature, the second outlet is closed, and the first outlet is opened; when the temperature of the hydraulic oil is greater than or equal to the set temperature, the first outlet is closed, and the second outlet is opened.

19. A wire saw machine comprising a cutting device, a feed device and a hydraulic system according to any one of claims 1-18, wherein the cutting device comprises a wire saw configured to cut a work piece, the feed device is configured to adjust the position of the wire saw, the first hydraulic motor is connected with the cutting device; the second hydraulic motor is connected with the feeding device.

20. The rope saw of claim 19 further comprising a bracket and a cutting angle adjustment device, wherein the cutting angle adjustment device is connected to the bracket and the cutting device, respectively, the cutting angle adjustment device configured to adjust an included angle between the cutting device and the bracket.