Rope sawing machine hydraulic system controlled by proportional valve

Abstract

The invention discloses a rope saw hydraulic system controlled by a proportional valve, and belongs to the technical field of rope saw hydraulic control. Comprising an oil tank, a first filter part, a first motor, a first hydraulic pump, a first one-way valve, a second one-way valve, a temperature sensor, an oil return filter, an air cooler, a first proportional valve, a second proportional valve, a first pressure sensor, a second pressure sensor, a second motor, a second filter part, a second hydraulic pump, a liquid level sensor, an air filter, an electric proportional reversing valve, an electromagnetic ball valve, an energy accumulator and a tensioning oil cylinder. The second motor is in transmission connection with a second hydraulic pump, an oil inlet of the second hydraulic pump is communicated with the oil tank through a second filter part, an oil outlet of the second hydraulic pump is communicated with an oil inlet of a second proportional valve, and an oil outlet of the second proportional valve is communicated with an oil inlet of an electric proportional reversing valve. The rope sawing machine hydraulic system controlled by the proportional valve has the beneficial effect that the sawing rope is prevented from being broken.

Description

Technical Field

[0001] This application relates to the field of hydraulic control technology for wire saws, and more specifically, to a proportional valve-controlled hydraulic system for wire saws. Background Technology

[0002] In the construction industry, cutting thick concrete, brick walls, marble, and other hard building materials is a crucial step in the construction process. Traditional cutting methods, mainly relying on mechanical sawing, blasting, or manual chiseling, have many technical shortcomings and cannot meet the demands of modern construction for safety, precision, and economy. The power and control systems of traditional cutting equipment are relatively outdated and cannot adaptively adjust to changes in cutting load. When cutting resistance increases, the equipment is prone to overload operation, leading to motor burnout, accelerated saw blade wear, and other malfunctions, reducing the equipment's durability. Conversely, when cutting resistance decreases, the equipment maintains high power output, resulting in energy waste and contradicting the industry's trend towards energy conservation and emission reduction.

[0003] Hydraulic wire saws, with their stable hydraulic transmission and high output torque, improve cutting accuracy and construction safety to some extent. However, existing hydraulic wire saw control systems mostly use proportional valves for pressure and flow control, which cannot achieve continuous adjustment of fluid parameters. This leads to impacts during equipment startup and operation, non-adjustable saw wire speed, and poor system stability. Furthermore, existing hydraulic wire saws lack effective pressure compensation and energy-saving mechanisms. During saw wire tensioning, if cylinder leakage occurs, the saw wire tension can easily become uncontrolled, affecting cutting quality and even causing safety accidents such as saw wire breakage.

[0004] Therefore, a hydraulic system for a wire saw with a proportional valve controlled to prevent wire breakage is provided. Summary of the Invention

[0005] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] To address the technical problems mentioned in the background section, some embodiments of this application provide a proportional valve-controlled hydraulic system for a wire saw, characterized by comprising an oil tank, a filter element one, a motor one, a hydraulic pump one, a check valve one, a check valve two, a temperature sensor, a return oil filter, an air cooler, a proportional valve one, a proportional valve two, a pressure sensor one, a pressure sensor two, a motor two, a filter element two, a hydraulic pump two, a level sensor, an air filter, an electro-proportional directional valve, a solenoid ball valve, an accumulator, and a tensioning cylinder; the motor two is connected to the hydraulic pump two via a drive connection; the inlet of the hydraulic pump two is connected to the oil tank via the filter element two; the outlet of the hydraulic pump two is connected to the inlet of the proportional valve two; the outlet of the proportional valve two is connected to the inlet of the electro-proportional directional valve; the two working ports of the electro-proportional directional valve are respectively connected to the rodless chamber and the rod chamber of the tensioning cylinder; the pressure sensor two is located at the outlet of the proportional valve two; and the electro-proportional directional valve is also connected to the accumulator via the solenoid ball valve.

[0007] The hydraulic oil output from hydraulic pump two, after being filtered by filter element two, first enters proportional valve two. Pressure sensor two monitors the pressure at the outlet of this valve in real time and feeds back the pressure signal to proportional valve two. As a proportional control element, proportional valve two can automatically adjust the output pressure value according to the changes in the saw rope cutting load (such as the resistance difference when cutting thick concrete or marble), ensuring that the pressure of the hydraulic oil entering the tensioning cylinder always matches the safe tension requirement of the saw rope. When the load increases and the saw rope tension may approach its limit, pressure sensor two feeds back a pressure increase signal, and proportional valve two promptly reduces the output pressure. When the load decreases and the saw rope may slack off, the valve appropriately increases the pressure to prevent the saw rope from breaking due to excessive tension caused by uncontrolled pressure. Therefore, it has a better ability to prevent saw rope breakage.

[0008] Furthermore, the motor is connected to the hydraulic pump, the inlet of the hydraulic pump is connected to the oil tank via the filter, the outlet of the hydraulic pump is connected to the inlet of the proportional valve, the outlet of the proportional valve is connected to the inlet of the return oil filter, the pressure sensor is located at the outlet of the proportional valve; the outlet of the return oil filter is connected to the inlet of the air cooler, the outlet of the air cooler is connected to the oil tank, and the temperature sensor is installed inside the oil tank to monitor the temperature of the hydraulic oil inside the tank.

[0009] Furthermore, the level sensor is installed inside the oil tank and is used to monitor the hydraulic oil level inside the oil tank; the air filter is installed at the top opening of the oil tank; the first check valve is located on the pipeline between the first hydraulic pump and the first proportional valve; and the second check valve is located on the pipeline between the second hydraulic pump and the second proportional valve.

[0010] Furthermore, the return port of the tensioning cylinder is connected to the inlet of the return oil filter via an electro-proportional directional valve; when the tensioning cylinder extends to its position, the second motor is turned off, the solenoid ball valve is energized, and the accumulator can replenish the tensioning cylinder with pressurized oil to compensate for the pressure loss caused by leakage in the tensioning cylinder.

[0011] Furthermore, both filter element one and filter element two are oil suction filters.

[0012] Further, the filter element includes: a first mounting plate; a second mounting plate fixedly connected to the first mounting plate; a first turntable rotatably connected to the first mounting plate; a geared disc fixedly connected to the first mounting plate; a first gear rotatably connected to the first turntable and meshing with the geared disc; a mounting bracket inserted into the first turntable; a locking block fixedly connected to the mounting bracket; a filter screen fixedly connected to the mounting bracket; a first limiting post fixedly connected to the mounting bracket; the first gear includes a first limiting hole; the first limiting post is inserted into the first limiting hole.

[0013] Furthermore, the first turntable includes a mounting hole, a limiting groove, and an insertion groove; the mounting hole is used to accommodate a mounting bracket; the insertion groove is for inserting a card block; the limiting groove is used to limit the card block; the limiting groove is an annular groove; the insertion groove communicates with the limiting groove.

[0014] Furthermore, the filter element one also includes: a connecting pipe, fixedly connected to the second mounting plate; a first slider, horizontally slidably connected to the connecting pipe; a first sliding rod, vertically slidably connected to the first slider; a second limiting post, fixedly connected to the first sliding rod; a guide post, fixedly connected to the first sliding rod; a push plate, fixedly connected to the guide post; and a first spring, sleeved on the guide post, with both ends fixedly connected to the first slider and the push plate respectively.

[0015] Furthermore, the connecting pipe is provided with a first groove extending along the axial direction of the connecting pipe; the first slider moves along the first groove; the first slider is provided with a second groove extending in the height direction of the first slider; the first slide rod moves along the second groove.

[0016] Furthermore, the second filter element has the same structure as the first filter element.

[0017] The beneficial effect of this application is that it provides a hydraulic system for a wire saw machine with a proportional valve controlled to prevent the saw wire from breaking. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0019] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0020] In the attached diagram: Figure 1 This is an overall schematic diagram based on an embodiment of this application; Figure 2 This is a structural schematic diagram of a part of the first embodiment, mainly showing the structure of motor one and hydraulic pump one; Figure 3 This is a schematic diagram of the first embodiment; Figure 4 This is a structural schematic diagram of a part of the second embodiment, mainly showing the structure of the first mounting plate; Figure 5 This is a structural schematic diagram of a part of the second embodiment, mainly showing the structure of the first limiting post and the first limiting hole; Figure 6 yes Figure 5 The enlarged view of part A mainly shows the structure of the first slider and the first slide rod; Figure 7 This is a structural schematic diagram of a part of the second embodiment, mainly showing the structure of the first limiting surface and the second limiting surface; Figure 8 This is a structural schematic diagram of a part of the second embodiment, mainly showing the structure of the card block and the limiting groove.

[0021] Figure label: 1. Oil tank; 2. Filter element 1; 3. Motor 1; 4. Hydraulic pump 1; 5a. Check valve 1; 5b. Check valve 2; 6. Temperature sensor; 7. Return oil filter; 8. Air cooler; 9a. Proportional valve 1; 9b. Proportional valve 2; 10a. Pressure sensor 1; 10b. Pressure sensor 2; 11. Motor 2; 12. Filter element 2; 13. Hydraulic pump 2; 14. Liquid level sensor; 15. Air filter; 16. Electro-proportional directional valve; 17. Solenoid ball valve; 18. Accumulator; 19. Tensioning cylinder; 20. First mounting plate; 20a. Clearance groove; 20b. First limiting surface ; 20c, Second limiting surface; 21, Second mounting plate; 22, First turntable; 22a, Mounting hole; 22b, Limiting groove; 22c, Insertion groove; 23, Gear plate; 24, First gear; 24a, First limiting hole; 25, Mounting bracket; 25a, Second limiting hole; 26, Locking block; 27, Filter screen; 28, First limiting post; 29, Connecting pipe; 29a, First sliding groove; 30, First slider; 30a, Second sliding groove; 30b, Guide hole; 31, First sliding rod; 32, Second limiting post; 33, Guide post; 34, Push plate; 35, First spring; 36, Drive block. Detailed Implementation

[0022] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0023] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0024] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0025] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0026] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Example 1: Reference Figure 1-3 A proportional valve controlled hydraulic system for a wire saw includes an oil tank 1, a filter element 2, a motor 3, a hydraulic pump 4, a check valve 5a, a check valve 5b, a temperature sensor 6, a return oil filter 7, an air cooler 8, a proportional valve 9a, a proportional valve 9b, a pressure sensor 10a, a pressure sensor 10b, a motor 11, a filter element 12, a hydraulic pump 13, a level sensor 14, an air filter 15, an electro-proportional directional valve 16, a solenoid ball valve 17, an accumulator 18, and a tensioning cylinder 19. Motor 2 11 is connected to hydraulic pump 2 13. The oil inlet of hydraulic pump 2 13 is connected to oil tank 1 through filter element 2 12. The oil outlet of hydraulic pump 2 13 is connected to the oil inlet of proportional valve 2 9b. The oil outlet of proportional valve 2 9b is connected to the oil inlet of electro-proportional directional valve 16. The two working oil ports of electro-proportional directional valve 16 are connected to the rodless chamber and rod chamber of tensioning cylinder 19, respectively. Pressure sensor 2 10b is located at the oil outlet of proportional valve 2 9b. Electro-proportional directional valve 16 is also connected to accumulator 18 through solenoid ball valve 17.

[0028] Motor 3 is connected to hydraulic pump 4. The inlet of hydraulic pump 4 is connected to oil tank 1 via filter 1. The outlet of hydraulic pump 4 is connected to the inlet of proportional valve 9a. The outlet of proportional valve 9a is connected to the inlet of return oil filter 7. Pressure sensor 10a is located at the outlet of proportional valve 1. The outlet of return oil filter 7 is connected to the inlet of air cooler 8. The outlet of air cooler 8 is connected to oil tank 1. Temperature sensor 6 is installed in oil tank 1 and is used to monitor the temperature of hydraulic oil in oil tank 1.

[0029] A level sensor 14 is installed inside the oil tank 1 to monitor the hydraulic oil level. An air filter 15 is installed at the top opening of the oil tank 1. One-way valve 5a is located on the pipeline between hydraulic pump 4 and proportional valve 1, and one-way valve 5b is located on the pipeline between hydraulic pump 13 and proportional valve 2. The return port of the tensioning cylinder 19 is connected to the inlet of the return oil filter 7 via an electro-proportional directional valve 16. When the tensioning cylinder 19 extends to its full position, motor 11 is turned off, solenoid ball valve 17 is energized, and accumulator 18 can replenish pressurized oil to the tensioning cylinder 19 to compensate for pressure loss caused by leakage. Filter element 2 and filter element 12 are both suction filters.

[0030] The pressure is regulated by activating proportional valves 9a and 9b. The proportional valves provide precise pressure control, automatically adjusting the system's required pressure value based on load changes and feedback from pressure sensors, achieving fully automated operation. After pressure is established, the electro-proportional directional valve 16 is energized, allowing the tension cylinder 19 to extend and retract, adjusting the saw rope tension. This valve allows stepless adjustment of the tension cylinder 19's operating speed, overcoming the previous limitation of unadjustable tension cylinder speed that led to excessively loose or tight saw ropes, or even breakage.

[0031] Simultaneously, after the electro-proportional directional valve 16 is energized, it can charge the accumulator 18 with liquid through the solenoid ball valve 17. After the cylinder extends to its position, the motor 11 is turned off, and the solenoid ball valve 17 is energized, causing the accumulator 18 to replenish the pressure oil to the tension cylinder 19 due to leakage. The hydraulic oil temperature is controlled by the temperature sensor 6, which monitors the oil tank 1 in real time. When the oil temperature reaches the set high value, the air cooler 8 is activated to cool the hydraulic oil. When the hydraulic oil temperature drops to the set low value, the air cooler 8 is turned off, ensuring that the oil temperature remains within a constant range. This extends the life of the seals in the hydraulic system and prevents oil leakage caused by excessively high oil temperature.

[0032] The hydraulic oil temperature is controlled by the level sensor 14, which monitors the oil tank 1 in real time. When the hydraulic oil level is too low, the level sensor 14 will send an alarm to the host computer; conversely, the same applies when the level is too high. The anti-saw rope breakage function is achieved by starting the motor to drive the hydraulic pump 4. The hydraulic oil is filtered through the filter element 2 and then transported into the pipeline. The proportional valve is activated to regulate the pressure, allowing for precise pressure control. The pressure feedback sends a suitable back pressure to the return oil, preventing the saw rope from breaking due to instantaneous pressure loss or stalling of the cylinder.

[0033] The hydraulic oil output from hydraulic pump 213 is filtered by filter element 212 and first enters proportional valve 29b. Pressure sensor 210b monitors the pressure at the outlet of the valve in real time and feeds back the pressure signal to proportional valve 29b. As a proportional control element, proportional valve 29b can automatically adjust the output pressure value according to the changes in the saw rope cutting load (such as the resistance difference when cutting thick concrete or marble), ensuring that the pressure of the hydraulic oil entering tension cylinder 19 always matches the safe tension requirement of the saw rope. When the load increases and the saw rope tension may approach the limit, pressure sensor 210b feeds back a pressure increase signal, and proportional valve 29b reduces the output pressure in time. When the load decreases and the saw rope may slack off, the valve appropriately increases the pressure to avoid the saw rope breaking due to excessive tension caused by uncontrolled pressure. Therefore, it can better prevent the saw rope from breaking.

[0034] Example 2: Reference Figure 4-8 The difference from Embodiment 1 is that, in order to facilitate the replacement of the filter screen, the filter one and filter two are optimized. The filter one includes: a first mounting plate 20, a second mounting plate 21, a first turntable 22, a gear plate 23, a first gear 24, a mounting bracket 25, a locking block 26, a filter screen 27, a first limiting post 28, a connecting pipe 29, a first slider 30, a first sliding rod 31, a second limiting post 32, a guide post 33, a push plate 34, and a first spring 35.

[0035] The second mounting plate 21 is fixedly connected to the first mounting plate 20. The first turntable 22 is rotatably connected to the first mounting plate 20. The gear 23 is fixedly connected to the first mounting plate 20. The first gear 24 is rotatably connected to the first turntable 22 and meshes with the gear 23. The mounting bracket 25 is inserted into the first turntable 22. The locking block 26 is fixedly connected to the mounting bracket 25. The filter screen 27 is fixedly connected to the mounting bracket 25. The first limiting post 28 is fixedly connected to the mounting bracket 25. The first gear 24 includes a first limiting hole 24a, and the first limiting post 28 is inserted into the first limiting hole 24a. There are two of each of the filter screen 27, the mounting bracket 25, and the locking block 26. Both the first mounting plate 20 and the second mounting plate 21 are provided with sealing grooves, and sealing rings are provided in the sealing grooves. The sealing rings are used for sealing between the mounting bracket 25 and the second mounting plate 21, and for sealing between the first mounting plate 20 and the first gear 24.

[0036] The first turntable 22 includes a mounting hole 22a, a limiting groove 22b, and an insertion groove 22c. The mounting hole 22a is used to accommodate the mounting bracket 25. The mounting bracket 25 can rotate circumferentially or move axially within the mounting hole 22a. The insertion groove 22c is for inserting the locking block 26, and the limiting groove 22b is used to limit the locking block 26. The limiting groove 22b is an annular groove, and the insertion groove 22c communicates with the limiting groove 22b. The connecting pipe 29 is fixedly connected to the second mounting plate 21. The first slider 30 is horizontally slidably connected to the connecting pipe 29. Specifically, the connecting pipe 29 is provided with a first sliding groove 29a extending axially along the connecting pipe 29, and the first slider 30 moves along the first sliding groove 29a.

[0037] A drive block 36 is provided on the circumference of the first turntable 22, and the drive block 36 is fixedly connected to the first turntable 22. The first mounting plate 20 includes a clearance groove 20a for the drive block 36 to move. The clearance groove 20a includes a first limiting surface 20b and a second limiting surface 20c. The first limiting surface 20b and the second limiting surface 20c are located at opposite ends of the clearance groove 20a. The mounting bracket 25 includes a second limiting hole 25a for limiting the second limiting post 32. Rubber pads are provided at both ends of the drive block 36 to increase friction and prevent the drive block 36 from moving without external force.

[0038] The first slide rod 31 is vertically slidably connected to the first slider 30. The first slider 30 has a second slide groove 30a extending in the height direction of the first slider 30, and the first slide rod 31 moves along the second slide groove 30a. The first slider 30 includes a guide hole 30b, and a guide post portion is located in the guide hole 30b and moves axially along the guide hole 30b. The second limiting post 32 is fixedly connected to the first slide rod 31. The guide post 33 is fixedly connected to the first slide rod 31. The push plate 34 is fixedly connected to the guide post 33. The first spring 35 is sleeved on the guide post 33, and its two ends are fixedly connected to the first slider 30 and the push plate 34 respectively. The filter element 2 12 has the same structure as the filter element 1 2. When the filter screen 27 needs to be replaced, push the first slider 30. The movement of the first slider 30 causes the first slide rod 31 to move. The first slide rod 31 moves the mounting bracket 25 and the filter screen 27 through the second limiting post 32. When it moves to one end of the connecting pipe 29, push the push plate 34. The movement of the push plate 34 causes the guide post 33 to move. The movement of the guide post 33 causes the first slide rod 31 to move. The movement of the first slide rod 31 causes the second limiting post 32 to move, so that the second limiting post 32 disengages from the second limiting hole 25a. Then the mounting bracket 25 and the filter screen 27 can be removed and a new filter screen 27 can be replaced.

[0039] Workflow: When the filter screen 27 needs to be replaced, push the first slider 30. The movement of the first slider 30 drives the first slide rod 31 to move. The first slide rod 31 moves the mounting bracket 25 and the filter screen 27 through the second limiting post 32. When it moves to one end of the connecting pipe 29, push the push plate 34. The movement of the push plate 34 drives the guide post 33 to move. The movement of the guide post 33 drives the first slide rod 31. The movement of the first slide rod 31 moves the second limiting post 32, causing the second limiting post 32 to disengage from the second limiting hole 25a. Then the mounting bracket 25 and the filter screen 27 can be removed and a new filter screen 27 can be replaced.

[0040] Meanwhile, there are two sets of mounting bracket 25 and filter screen 27. When it is necessary to replace the lower filter screen 27 to the upper one, push the drive block 36 to move the drive block 36 from the first limiting surface 20b to the second limiting surface 20c. The movement of the drive block 36 drives the first turntable 22 to rotate. The first gear 24 meshes with the gear plate 23. Therefore, the first turntable 22 will drive the first gear 24 to move and rotate at the same time. The rotation of the first gear 24 drives the mounting bracket 25 to rotate, thereby moving the locking block 26 from the insertion slot 22c to the limiting slot 22b, which better fixes the mounting bracket 25. At the same time, when the upper mounting bracket 25 is moved to the lower one, the locking block 26 moves from the limiting slot 22b to the insertion slot 22c. When replacing the new filter screen 27, the upper filter screen 27 can be moved to the lower one and replaced. The replacement is convenient and does not affect the use of the filter screen 27. It is more convenient for daily use and reduces the time cost of replacing the filter screen 27. Motor 3 drives hydraulic pump 4. The oil inlet of hydraulic pump 4 is filtered by filter screen 27 to prevent impurities from entering the equipment through the oil circuit, thus achieving a protective effect.

[0041] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A proportional valve-controlled hydraulic system for a wire saw, characterized in that, Includes an oil tank (1), filter element one (2), motor one (3), hydraulic pump one (4), check valve one (5a), check valve two (5b), temperature sensor (6), return oil filter (7), air cooler (8), proportional valve one (9a), proportional valve two (9b), pressure sensor one (10a), pressure sensor two (10b), motor two (11), filter element two (12), hydraulic pump two (13), level sensor (14), air filter (15), electro-proportional directional valve (16), solenoid ball valve (17), accumulator (18), and tensioning cylinder (19); the motor two (11) and Hydraulic pump two (13) is connected to the transmission. The oil inlet of the hydraulic pump two (13) is connected to the oil tank (1) through filter element two (12). The oil outlet of the hydraulic pump two (13) is connected to the oil inlet of proportional valve two (9b). The oil outlet of proportional valve two (9b) is connected to the oil inlet of electro-proportional directional valve (16). The two working oil ports of the electro-proportional directional valve (16) are respectively connected to the rodless chamber and the rod chamber of the tensioning cylinder (19). The pressure sensor two (10b) is located at the oil outlet of proportional valve two (9b). The electro-proportional directional valve (16) is also connected to the accumulator (18) through electromagnetic ball valve (17).

2. The proportional valve-controlled hydraulic system for a wire saw as described in claim 1, characterized in that: The motor (3) is connected to the hydraulic pump (4) via a transmission. The inlet of the hydraulic pump (4) is connected to the oil tank (1) via the filter (2). The outlet of the hydraulic pump (4) is connected to the inlet of the proportional valve (9a). The outlet of the proportional valve (9a) is connected to the inlet of the return oil filter (7). The pressure sensor (10a) is located at the outlet of the proportional valve (9a). The outlet of the return oil filter (7) is connected to the inlet of the air cooler (8). The outlet of the air cooler (8) is connected to the oil tank (1). The temperature sensor (6) is installed in the oil tank (1) and is used to monitor the temperature of the hydraulic oil in the oil tank (1).

3. The proportional valve-controlled hydraulic system for a wire saw as described in claim 1, characterized in that: The level sensor (14) is installed inside the oil tank (1) and is used to monitor the hydraulic oil level inside the oil tank (1). The air filter (15) is installed at the top opening of the oil tank (1). The first check valve (5a) is located on the pipeline between the first hydraulic pump (4) and the first proportional valve (9a). The second check valve (5b) is located on the pipeline between the second hydraulic pump (13) and the second proportional valve (9b).

4. The proportional valve-controlled hydraulic system for a wire saw according to claim 2, characterized in that: The return port of the tensioning cylinder (19) is connected to the inlet of the return oil filter (7) via the electro-proportional directional valve (16); when the tensioning cylinder (19) extends to the position, the motor (11) is turned off, the solenoid ball valve (17) is energized, and the accumulator (18) can replenish the pressure oil to the tensioning cylinder (19) to compensate for the pressure loss caused by leakage of the tensioning cylinder (19).

5. The proportional valve-controlled hydraulic system for a wire saw according to claim 1, characterized in that: Both filter element one (2) and filter element two (12) are oil suction filters.

6. The proportional valve-controlled hydraulic system for a wire saw according to claim 1, characterized in that: The filter element (2) includes: First mounting plate (20); The second mounting plate (21) is fixedly connected to the first mounting plate (20); The first turntable (22) is rotatably connected to the first mounting plate (20); The gear plate (23) is fixedly connected to the first mounting plate (20); The first gear (24) is rotatably connected to the first turntable (22) and meshes with the gear plate (23); Mounting bracket (25) is inserted into the first turntable (22); The locking block (26) is fixedly connected to the mounting bracket (25); The filter screen (27) is fixedly connected to the mounting bracket (25); The first limiting post (28) is fixedly connected to the mounting bracket (25); The first gear (24) includes a first limiting hole (24a); the first limiting post (28) is inserted into the first limiting hole (24a).

7. The proportional valve-controlled hydraulic system for a wire saw according to claim 6, characterized in that: The first turntable (22) includes a mounting hole (22a), a limiting groove (22b), and an insertion groove (22c); The mounting hole (22a) is used to accommodate the mounting bracket (25); The insertion slot (22c) is for inserting the card block (26); The limiting groove (22b) is used to limit the position of the locking block (26); the limiting groove (22b) is an annular groove; The insertion slot (22c) is connected to the limiting slot (22b).

8. The proportional valve-controlled hydraulic system for a wire saw according to claim 7, characterized in that: The filter element (2) further includes: The connecting pipe (29) is fixedly connected to the second mounting plate (21); The first slider (30) is horizontally slidably connected to the connecting tube (29); The first sliding rod (31) is vertically slidably connected to the first slider (30); The second limiting post (32) is fixedly connected to the first sliding rod (31); The guide post (33) is fixedly connected to the first slide rod (31); The push plate (34) is fixedly connected to the guide post (33); The first spring (35) is sleeved on the guide post (33), and its two ends are fixedly connected to the first slider (30) and the push plate (34) respectively.

9. The proportional valve-controlled hydraulic system for a wire saw according to claim 8, characterized in that: The connecting pipe (29) is provided with a first groove (29a) extending along the axial direction of the connecting pipe (29); The first slider (30) moves along the first groove (29a); The first slider (30) is provided with a second groove (30a) extending in the height direction of the first slider (30); The first slide bar (31) moves along the second slide groove (30a).

10. The proportional valve-controlled hydraulic system for a wire saw according to claim 6, characterized in that: The filter element 2 (12) has the same structure as the filter element 1 (2).

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