A hydraulic system for a numerical control machine tool

Abstract

This utility model relates to the field of hydraulic control technology, specifically to a hydraulic system for CNC machine tools. It includes an oil tank containing an oil pump assembly. A valve block 1 is mounted on the oil tank, and two valve blocks 3 and an accumulator block are sequentially mounted on the valve block 1. A pressure-reducing valve 1 is mounted on the accumulator block, and a valve block 2 is mounted on the pressure-reducing valve 1. The valve blocks have interconnected inlet and return oil passages. The oil pump assembly is connected to the inlet oil passage in the valve block 1. The valve block 2 and the two valve blocks 3 have interfaces connected to the inlet and return oil passages, respectively. The interfaces of the two valve blocks 3 are connected to a spindle tool clamping valve assembly, a triple valve assembly, and an A-axis zero-point positioning valve assembly. The two interfaces of the valve block 2 are connected to a tool magazine valve assembly. This application employs multiple sets of relief valves, pressure-reducing valves, and accumulators working in tandem to achieve stable oil supply and ensure stable operation of the actuators. In this application, multiple accumulators are connected in parallel near the execution circuit, shortening the response time of valves and actuators.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, specifically to a hydraulic system for CNC machine tools. Background Technology

[0002] Machine tools are important equipment for machining. However, the current hydraulic supply system of machine tools has certain defects. For example, the pump output has pulsation and transient load, which can easily lead to sluggish action or unstable clamping force. The multi-circuit parallel connection and complex valve group layout make it difficult to balance flow rate, speed regulation, oil priority and circuit isolation, resulting in potential risks of circuit crosstalk and inconsistent response. Utility Model Content

[0003] The purpose of this utility model is to provide a reasonably designed hydraulic system for CNC machine tools that addresses the defects and shortcomings of existing technologies and can solve the aforementioned deficiencies.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: It includes an oil tank, an oil pump assembly inside the oil tank, a valve block 1 on the oil tank, two valve blocks 3 and an accumulator block sequentially mounted on the valve block 1, a pressure reducing valve 1 on the accumulator block, a valve block 2 on the pressure reducing valve 1, and interconnected oil inlet and return lines within the aforementioned valve blocks. A throttle valve 1 is installed between the oil inlet and return lines. An accumulator 1 is connected to the oil inlet line on the accumulator block, and a filter is installed on the oil tank in the return line. The oil pump assembly is connected to the valve blocks. In the oil inlet circuit of valve block 1, a one-way valve 1 is installed on the oil inlet circuit of valve block 1, and a pressure sensor 1 and a pressure gauge 1 are installed on the pipeline behind the one-way valve 1; valve block 2 and two valve blocks 3 are respectively provided with interfaces connected to the oil inlet circuit and the oil return circuit, and the interfaces of the two valve blocks 3 are connected to the spindle tool clamping valve group, the triple valve group and the A-axis zero point positioning valve group; pressure reducing valve 1 is connected between one interface on the accumulator block and the oil inlet circuit, and the control port of pressure reducing valve 1 is connected to connector 1 on valve block 2, and the two interfaces of valve block 2 are connected to the tool magazine valve group.

[0005] Preferably, the spindle clamping valve assembly includes a valve block four, with interfaces for connecting to the oil inlet at both ends. A double one-way throttle valve two is provided on the valve block four, and a pressure reducing valve three and a pressure reducing valve two are respectively provided on the throttle valve two. A one-way valve two is provided on the pressure reducing valve two, which is a double hydraulically controlled one-way valve, and a directional valve is provided on the one-way valve two. The oil inlet in the valve block four passes through the pressure reducing valve two, then through the one-way valve two, and connects to the directional valve. The return oil path passes through the pressure reducing valve three, then through the one-way valve two, and connects to the directional valve. The two actuation ports of the directional valve are connected to the actuators through the throttle valve two. A pressure gauge three is connected to the pipeline between the pressure reducing valve three and the return oil path. A pressure gauge two is provided on the oil path downstream of the pressure reducing valve two.

[0006] Preferably, the triple valve assembly includes a valve block five, which has three valve groups, including a valve group one for connecting the B-axis brake release, a valve group two for connecting the A-axis brake, and a valve group three for connecting the A-axis brake. The valve groups two and three have the same structure.

[0007] Preferably, the valve assembly includes a pressure reducing valve four mounted on a valve block five, which has a connector two for connecting and controlling pressure. The pressure reducing valve four has a valve block six, a check valve three, and a solenoid ball valve one. The oil inlet of the valve block five is connected to the pressure reducing valve four, and then to the solenoid ball valve one via the check valve three. The oil return path is connected to the solenoid ball valve one via the check valve three. A hydraulic valve one is located inside the valve block six. One output port of the solenoid ball valve one is connected to an actuator. The pipeline behind this port is connected to the hydraulic valve one, and a pressure sensor two is installed on this pipeline. The other end of the hydraulic valve one is connected to the oil return path.

[0008] Preferably, the valve assembly 2 includes a check valve mounted on valve block 5, which is a double hydraulic check valve. A valve block 7 is connected to the check valve, and a solenoid ball valve 2 is connected to valve block 7. The oil inlet and return lines are connected to the solenoid ball valve 2 after passing through the check valve. An accumulator 2 is provided on the oil inlet line between the check valve and the solenoid ball valve 2. One of the output ports of the solenoid ball valve 2 is connected to the actuator, and a pressure sensor 4 is provided on the connected pipeline.

[0009] Preferably, the A-axis zero-point positioning valve assembly includes a valve block eight, a pressure reducing valve five on the valve block eight, a valve block nine on the pressure reducing valve five, a check valve four on the valve block nine, an electromagnetic ball valve three on the check valve four, and a connector three for connecting and controlling pressure connected to the pressure reducing valve five. The oil inlet path in the valve block eight is connected to the electromagnetic ball valve three after passing through the pressure reducing valve five and the check valve four. The oil return path is connected to the electromagnetic ball valve three after passing through the check valve four. One of the output ports of the electromagnetic ball valve three is connected to the actuator, and a pressure sensor three and a hydraulic valve two connected to the oil return path are provided on the oil path connected to this port. A flow sensor is provided on the pipeline connecting the oil path and the actuator.

[0010] Preferably, the tool magazine valve assembly includes a valve block ten. The inlet and return oil lines within valve block ten are respectively connected to valve block two via check valve five. The inlet oil line of valve block ten is equipped with an accumulator three, a pressure gauge four, and an overflow valve two. The pressure gauge four is installed via a pressure testing connector. Valve block ten has an oil supply line for supplying oil to the actuators. Valve block ten is equipped with a reversing valve one and a reversing valve two. The inlet oil lines are respectively connected to the P terminals of reversing valve one and reversing valve two, and the return oil line is connected to the T terminal of reversing valve two. The T terminal of reversing valve one is connected to the oil supply line, one of its output terminals is connected back to the inlet oil line, and the other output terminal is connected to the oil supply line. One outlet terminal of reversing valve two is sealed, and the other outlet terminal is connected to the oil supply line. Two identical sets of pressure gauges (PTs) are connected to the oil supply line. Each PT check valve is equipped with a one-way throttle valve, which is a double one-way valve. A reversing valve four is installed on the one-way throttle valve. The oil supply line and the oil return line are connected to the reversing valve four after passing through the PT check valve. The output port of the reversing valve four is connected to the actuator after passing through the one-way throttle valve. A pressure gauge four is installed on the oil supply line and the oil inlet line of one of the actuators. An overflow valve two is installed on the return line in front of the two reversing valves four inside the valve block ten. A reversing valve three is installed on the valve block ten. The P port of the reversing valve three is connected to the return line behind the overflow valve two. The T port of the reversing valve three is blocked. The two output ports of the reversing valve three are connected to the return line in front of the overflow valve two. A throttle valve is also installed on the oil line connected to one of the output ports.

[0011] Preferably, an overflow valve is provided between the oil inlet and return lines within the valve block, and the overflow valve is located in front of the check valve.

[0012] Preferably, the oil pump assembly includes a gear pump, which is connected to a motor via a coupling and has a bell-shaped cover on its outer side.

[0013] Preferably, the oil tank is equipped with an oil filler port, a liquid level and temperature switch, and an oil level gauge.

[0014] The beneficial effects of this utility model after adopting the above structure are: This application employs multiple sets of relief valves, pressure reducing valves, and accumulators working in tandem to achieve stable oil supply, ensure stable working pressure, and guarantee stable operation of the actuators.

[0015] In this application, multiple accumulators are connected in parallel near the execution circuit, which can provide energy in a short time, shorten the response time of valves and actuators, and reduce the instantaneous load on the oil pump.

[0016] This application employs multiple throttle valves and check valves to form a speed and flow regulation structure, ensuring precise control of each critical action. Different functional modules are mutually isolated to prevent pressure interference from a single module from affecting other equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main circuit in this utility model; Figure 2 This is a schematic diagram of the spindle clamping valve assembly in this utility model; Figure 3 This is a schematic diagram of the three-valve assembly in this utility model; Figure 4 This is a schematic diagram of the A-axis zero-point positioning valve assembly in this utility model; Figure 5 This is a schematic diagram of the tool magazine valve assembly in this utility model; Figure 6 This is a schematic diagram of the external structure of the oil tank and pump unit in this utility model; Figure 7 This is a top view of the oil tank and pump unit in this utility model; Figure 8 This is a schematic diagram of the external structure of the spindle clamping valve assembly in this utility model; Figure 9 This is an external structural diagram of the triple valve assembly in this utility model; Figure 10 This is an external structural diagram of the A-axis zero-point positioning valve assembly in this utility model; Figure 11 This is an external structural diagram of the knife magazine valve assembly in this utility model.

[0018] Explanation of reference numerals in the attached figures: 1. Oil tank; 2. Filler neck; 3. Oil level gauge; 4. Motor; 5. Gear pump; 6. Check valve 1; 7. Overflow valve 1; 8. Coupling; 9. Pressure sensor 1; 10. Pressure gauge 1; 11. Bell jar; 12. Valve block 1; 13. Liquid level and temperature switch; 14. Filter; 15. Accumulator 1; 16. Throttle valve 1; 17. Accumulator block; 18. Valve block 2; 19. Valve block 3; 20. Pressure reducing valve 1; 21. Connector 1; 1-1. Valve block 4; 1-2. Directional valve; 1-3. Check valve 2; 1-4. Pressure reducing valve 2; 1-5. Pressure gauge 2; 1-6. Pressure reducing valve 3; 1-7. Pressure gauge 3; 1-8. Throttle valve 2; 2-1. Valve block 5; 2-2. Solenoid ball valve 1; 2-3. Check valve 3; 2-4. Pressure sensor 2; 2-5. Pressure reducing valve 4; Valve 4; 2-6, Connector 2; 2-7, Valve Block 6; 2-8, Hydraulic Valve 1; 2-9, Pressure Sensor 4; 2-10, Solenoid Ball Valve 2; 2-11, Valve Block 7; 2-12, Accumulator 2; 3-1, Valve Block 8; 3-2, Check Valve 4; 3-3, Valve Block 9; 3-4, Hydraulic Valve 2; 3-5, Pressure Sensor 3; 3-6, Pressure Reducing Valve 5; 3-7, Connector 3; 3-8, Solenoid Ball Valve 3; 3-9, Flow Sensor; 4-1, Valve Block 10; 4-2, Accumulator 3; 4-3, Relief Valve 2; 4-4, Pressure Gauge 4; 4-5, Pressure Testing Connector; 4-6, Directional Control Valve 1; 4-7, Directional Control Valve 2; 4-8, Check Valve 5; 4-9, Directional Control Valve 3; 4-10, PT Check Valve; 4-11, One-Way Throttle Valve; 4-12, Directional Control Valve 4. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] See Figures 1-11As shown, it includes an oil tank 1, which is equipped with a filler port 2, a liquid level and temperature switch 13, and an oil level gauge 3. An oil pump assembly is located inside the oil tank 1, including a gear pump 5. The gear pump 5 is connected to a motor 4 via a coupling 8 and has a bell-shaped cover 11 on its outer side. The oil tank 1 is equipped with a valve block 12, on which two valve blocks 19 and an accumulator block 17 are sequentially mounted. The accumulator block 17 is equipped with a pressure reducing valve 20, and a valve block 18 is mounted on the pressure reducing valve 20. The valve blocks have interconnected inlet and return oil passages. A throttle valve 16 is located between the inlet and return oil passages. An accumulator 15 is connected to the inlet oil passage of the accumulator block 17 to ensure stable pressure. A filter 14 is installed on the oil tank 1 in the oil circuit. The oil pump assembly is connected to the oil inlet circuit in the valve block 12. A check valve 6 is installed on the oil inlet circuit in the valve block 12. A pressure sensor 9 and a pressure gauge 10 are installed on the pipeline behind the check valve 6. The valve block 2 18 and the two valve blocks 3 19 are respectively provided with interfaces connected to the oil inlet circuit and the oil return circuit. The interfaces of the two valve blocks 3 19 are connected to the spindle tool clamping valve group, the triple valve group and the A-axis zero point positioning valve group. The pressure reducing valve 20 is connected between one interface on the accumulator block 17 and the oil inlet circuit. The control port of the pressure reducing valve 20 is connected to the connector 21 on the valve block 2 18. The two interfaces of the valve block 2 18 are connected to the tool magazine valve group. The spindle clamping valve assembly includes a valve block 4 1-1, with interfaces at both ends for connecting to the oil inlet. It is equipped with a double one-way throttle valve 2 1-8, which is connected to pressure reducing valve 3 1-6 and pressure reducing valve 2 1-4. Pressure reducing valve 2 1-4 is equipped with a one-way valve 2 1-3, which is a double hydraulically controlled one-way valve. A directional valve 1-2 is also mounted on check valve 2 1-3. The oil inlet path within valve block 4 1-1, after passing through pressure reducing valve 2 1-4, connects to directional valve 1-2 via check valve 2 1-3. The return path, after passing through pressure reducing valve 3 1-6, connects to directional valve 1-2 via check valve 2 1-3. The two actuation ports of directional valve 1-2 are connected to the actuator via throttle valve 2 1-8. A pressure gauge 3 1-7 is connected to the pipeline between pressure reducing valve 3 1-6 and the return path. A pressure gauge 2 1-5 is located on the oil line downstream of pressure reducing valve 2 1-4. The triple valve assembly includes valve block 5 2-1, which has three valve groups, including valve group 1 for connecting the B-axis brake release, valve group 2 for connecting the A-axis brake, and valve group 3 for connecting the A-axis brake. Valve group 2 and valve group 3 have the same structure, and each valve group has a relatively independent function, realizing a modular structure and separating each area to prevent mutual interference. Valve assembly one includes a pressure reducing valve four 2-5 located on valve block five 2-1, which has a connector two 2-6 for connecting to control pressure. Valve block six 2-7 is located on valve block four 2-5, and check valve three 2-3 is located on valve block six 2-7. Electromagnetic ball valve one 2-2 is located on check valve three 2-3. The oil inlet of valve block five 2-1 is connected to pressure reducing valve four 2-5, and then to electromagnetic ball valve one 2-2 via check valve three 2-3. The oil return is connected to electromagnetic ball valve one 2-2 via check valve three 2-3. Hydraulic valve one 2-8 is located inside valve block six 2-7. One output port of electromagnetic ball valve one 2-2 is connected to an actuator. The pipeline behind this port is connected to hydraulic valve one 2-8, and pressure sensor two 2-4 is located on this pipeline. The other end of hydraulic valve one 2-8 is connected to the oil return. Valve assembly two includes a check valve mounted on valve block five 2-1, which is a double hydraulically controlled check valve. Valve block seven 2-11 is connected to valve block seven 2-11, and solenoid ball valve two 2-10 is connected to valve block seven 2-11. The oil inlet and return lines are connected to solenoid ball valve two 2-10 after passing through the check valves. Accumulator two 2-12 is provided on the oil inlet line between the check valve and solenoid ball valve two 2-10. One of the output ports of solenoid ball valve two 2-10 is connected to the actuator, and pressure sensor four 2-9 is provided on the connected pipeline. Accumulator two 2-12 provides short-term energy release for the instantaneous action of braking or holding brake, and monitors the working pressure through the sensor. The A-axis zero-point positioning valve assembly includes valve block 8 3-1, a pressure reducing valve 5 3-6 on valve block 8 3-1, a valve block 9 3-3 on pressure reducing valve 5 3-6, a check valve 4 3-2 on valve block 9 3-3, and a solenoid ball valve 3 3-8 on check valve 4 3-2. A connector 3 3-7 for connecting and controlling pressure is connected to pressure reducing valve 5 3-6. The oil inlet path in valve block 8 3-1, after passing through pressure reducing valve 5 3-6 and check valve 4 3-2, connects to solenoid ball valve 3 3-8. The oil return path, after passing through check valve 4 3-2, connects to solenoid ball valve 3 3-8. One output port of solenoid ball valve 3 3-8 connects to the actuator, and a pressure sensor 3 3-5 and a hydraulic valve 2 3-4 connected to the oil return path are installed on the oil path connected to this port. A flow sensor 3-9 is installed on the pipeline connecting the oil path and the actuator. A-axis positioning is achieved through precise pressure reduction and one-way control. The flow sensor 3-9 is used to detect whether the actuator's operation is normal and for speed control. The tool magazine valve assembly includes valve block 10 4-1. The inlet and return oil lines within valve block 10 4-1 are connected to valve block 2 18 via check valve 5 4-8. The inlet oil line of valve block 10 4-1 is equipped with accumulator 3 4-2, pressure gauge 4-4, and relief valve 2 4-3. Pressure gauge 4-4 is installed via pressure test connector 4-5. Valve block 10 4-1 contains an oil supply line for supplying oil to the actuators. Valve block 10 4-1 is equipped with directional valve 1 4-6 and directional valve 2 4-7. The inlet oil line is divided into... Do not connect to the P terminals of directional valve 1 (4-6) and directional valve 2 (4-7). The return oil circuit is connected to the T terminal of directional valve 2 (4-7). The T terminal of directional valve 1 (4-6) is connected to the oil supply circuit, with one output terminal connected back to the inlet circuit and the other output terminal connected to the oil supply circuit. One outlet terminal of directional valve 2 (4-7) is sealed, and the other outlet terminal is connected to the oil supply circuit. Two identical PT check valves (4-10) are connected to the oil supply circuit, and each PT check valve (4-10) is equipped with a one-way throttle valve (4-11). The one-way throttle valve 4-11 is a double one-way valve, and a reversing valve 4-12 is installed on the one-way throttle valve 4-11. The oil supply line and the oil return line are connected to the reversing valve 4-12 after passing through the PT one-way valve 4-10. The output port of the reversing valve 4-12 is connected to the actuator after passing through the one-way throttle valve 4-11. A pressure gauge 4-4 is installed on the oil supply line and the oil inlet line of one of the actuators. Inside the valve block 4-1, on the oil return line located at the front end of the two reversing valves 4-12. It is equipped with a relief valve 4-3 and a directional valve 4-9 on valve block 4-1. The P port of the directional valve 4-9 is connected to the return oil line at the rear end of the relief valve 4-3, and the T port of the directional valve 4-9 is blocked. The two output ports of the directional valve 4-9 are respectively connected to the return oil line at the front end of the relief valve 4-3. A throttle valve is also provided on the oil line connected to one of its output ports. Through multiple sets of throttling and one-way protection, the oil supply line can be pressurized and depressurized to ensure oil stability and prevent leakage. An overflow valve 7 is provided between the oil inlet and return lines in valve block 12. The overflow valve 7 is located in front of the check valve 6 to ensure that the pressure relief function is not affected by the check valve.

[0021] The installation, connection, or setting methods of the components not detailed above are all common mechanical methods, and the specific structure, model, and coefficient indicators of all their components are their own technologies. As long as they can achieve their beneficial effects, they can be implemented, so they will not be elaborated further.

[0022] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A hydraulic system for CNC machine tools, comprising an oil tank (1), characterized in that: An oil pump assembly is installed inside the oil tank (1). A valve block 1 (12) is installed on the oil tank (1). Two valve blocks 3 (19) and an accumulator block (17) are installed on the valve block 1 (12) in sequence. A pressure reducing valve 1 (20) is installed on the accumulator block (17). A valve block 2 (18) is installed on the pressure reducing valve 1 (20). The above-mentioned multiple valve blocks are provided with interconnected oil inlet and return oil lines. A throttle valve 1 (16) is installed between the oil inlet and return oil lines. An accumulator 1 (15) is connected to the oil inlet line on the accumulator block (17). A filter (14) is installed on the oil tank (1) in the return oil line. The oil pump assembly is connected to the oil inlet line inside the valve block 1 (12). (12) The oil inlet line is equipped with a check valve (6), and the pipeline behind the check valve (6) is equipped with a pressure sensor (9) and a pressure gauge (10); the valve block (2) and the two valve blocks (3) are respectively equipped with interfaces connected to the oil inlet line and the oil return line. The interfaces of the two valve blocks (3) are connected to the spindle clamp valve group, the triple valve group and the A-axis zero point positioning valve group; the pressure reducing valve (1) (20) is connected between one interface on the accumulator block (17) and the oil inlet line. The control port of the pressure reducing valve (1) (20) is connected to the connector (21) on the valve block (2) (18). The two interfaces of the valve block (2) (18) are connected to the tool magazine valve group.

2. The hydraulic system for CNC machine tools according to claim 1, characterized in that: The spindle clamping valve assembly includes a valve block four (1-1), with interfaces for connecting to the oil inlet at both ends. It is equipped with a double one-way throttle valve two (1-8), which is connected to a pressure reducing valve three (1-6) and a pressure reducing valve two (1-4). The pressure reducing valve two (1-4) is equipped with a one-way valve two (1-3), which is a double hydraulically controlled one-way valve. The one-way valve two (1-3) is equipped with a directional valve (1-2). The oil inlet within the valve block four (1-1) passes through the pressure reducing valve. After the second (1-4), the directional valve (1-2) is connected through the second check valve (1-3). The return oil circuit passes through the third pressure reducing valve (1-6) and then through the second check valve (1-3) to connect to the directional valve (1-2). The two actuation ports of the directional valve (1-2) are connected to the actuator through the second throttle valve (1-8). The pressure gauge (1-7) is connected to the pipeline between the third pressure reducing valve (1-6) and the return oil circuit. The pressure gauge (1-5) is installed on the oil circuit after the second pressure reducing valve (1-4).

3. The hydraulic system for CNC machine tools according to claim 2, characterized in that: The triple valve assembly includes valve block five (2-1), which is equipped with three valve groups, including valve group one for connecting the B-axis brake release, valve group two for connecting the A-axis brake, and valve group three for connecting the A-axis brake. Valve group two and valve group three have the same structure.

4. A hydraulic system for CNC machine tools according to claim 3, characterized in that: The valve assembly includes a pressure reducing valve four (2-5) mounted on valve block five (2-1), which has a connector two (2-6) for connecting and controlling pressure. Valve block six (2-7) is mounted on pressure reducing valve four (2-5), and check valve three (2-3) is mounted on check valve three (2-3). Electromagnetic ball valve one (2-2) is mounted on check valve three (2-3). After the oil inlet of valve block five (2-1) is connected to pressure reducing valve four (2-5), the oil flows through check valve three (2-3)... The oil return path is connected to the solenoid ball valve (2-2) after the oil return path is connected to the solenoid ball valve (2-2) through the check valve (2-3). The valve block (2-7) contains the hydraulic valve (2-8). One of the output ports of the solenoid ball valve (2-2) is connected to the actuator. The pipeline behind this port is connected to the hydraulic valve (2-8), and the pipeline is equipped with the pressure sensor (2-4). The other end of the hydraulic valve (2-8) is connected to the oil return path.

5. A hydraulic system for CNC machine tools according to claim 3, characterized in that: The valve group two includes a check valve installed on valve block five (2-1), which is a double hydraulic check valve. Valve block seven (2-11) is connected to it, and solenoid ball valve two (2-10) is connected to valve block seven (2-11). The oil inlet and return lines are connected to solenoid ball valve two (2-10) after passing through the check valve. Accumulator two (2-12) is provided on the oil inlet line between the check valve and solenoid ball valve two (2-10). One of the output ports of solenoid ball valve two (2-10) is connected to the actuator, and pressure sensor four (2-9) is provided on the connected pipeline.

6. A hydraulic system for CNC machine tools according to claim 1, characterized in that: The A-axis zero-point positioning valve assembly includes valve block eight (3-1), valve block eight (3-1) is equipped with pressure reducing valve five (3-6), pressure reducing valve five (3-6) is equipped with valve block nine (3-3), valve block nine (3-3) is equipped with check valve four (3-2), check valve four (3-2) is equipped with solenoid ball valve three (3-8), pressure reducing valve five (3-6) is connected to connector three (3-7) for connecting control pressure, and the oil inlet passage in valve block eight (3-1) passes through... After pressure reducing valve five (3-6) and check valve four (3-2), it is connected to solenoid ball valve three (3-8). The return oil circuit is connected to solenoid ball valve three (3-8) after passing through check valve four (3-2). One of the output ports of solenoid ball valve three (3-8) is connected to the actuator. The oil circuit connected to this port is equipped with pressure sensor three (3-5) and hydraulic valve two (3-4) connected to the return oil circuit. The pipeline connecting the oil circuit and the actuator is equipped with flow sensor (3-9).

7. A hydraulic system for CNC machine tools according to claim 1, characterized in that: The tool magazine valve assembly includes valve block 10 (4-1). The oil inlet and return lines of valve block 10 (4-1) are respectively connected to valve block 2 (18) via check valve 5 (4-8). The oil inlet line of valve block 10 (4-1) is equipped with accumulator 3 (4-2), pressure gauge 4 (4-4), and overflow valve 2 (4-3). Pressure gauge 4 (4-4) is installed via pressure test connector (4-5). Valve block 10 (4-1) is equipped with an oil supply line for supplying oil to the actuator. Valve block 10 (4-1) is equipped with directional valve 1 ( 4-6) and directional control valve 2 (4-7) have their inlet lines connected to the P terminals of directional control valve 1 (4-6) and directional control valve 2 (4-7) respectively, and their return lines connected to the T terminal of directional control valve 2 (4-7). The T terminal of directional control valve 1 (4-6) is connected to the oil supply line, one of its output terminals is connected back to the inlet line, and the other output terminal is connected to the oil supply line. One outlet of directional control valve 2 (4-7) is sealed, and the other outlet is connected to the oil supply line. Two identical PT check valves (4-10) are connected to the oil supply line. A one-way throttle valve (4-11) is installed on the one-way valve (4-10). The one-way throttle valve (4-11) is a double one-way valve. A directional control valve (4-12) is installed on the one-way throttle valve (4-11). The oil supply line and the oil return line are connected to the directional control valve (4-12) after passing through the PT one-way valve (4-10). The output port of the directional control valve (4-12) is connected to the actuator after passing through the one-way throttle valve (4-11). A pressure gauge (4-4) is installed on the oil supply line and on the oil inlet line of one of the actuators. Inside valve block 10 (4-1), on the return oil line at the front end of the two directional valves 4 (4-12), there is a relief valve 2 (4-3). On valve block 10 (4-1), there is a directional valve 3 (4-9). The P port of directional valve 3 (4-9) is connected to the return oil line at the rear end of relief valve 2 (4-3). The T port of directional valve 3 (4-9) is blocked. The two output ports of directional valve 3 (4-9) are respectively connected to the return oil line at the front end of relief valve 2 (4-3). A throttle valve is also provided on the oil line connected to one of its output ports.

8. A hydraulic system for CNC machine tools according to claim 1, characterized in that: An overflow valve (7) is provided between the oil inlet and return lines in the valve block (12), and the overflow valve (7) is located in front of the check valve (6).

9. A hydraulic system for CNC machine tools according to claim 1, characterized in that: The oil pump assembly includes a gear pump (5), which is connected to a motor (4) via a coupling (8) and has a bell-shaped cover (11) on its outer side.

10. A hydraulic system for CNC machine tools according to claim 1, characterized in that: The oil tank (1) is equipped with an oil filling port (2), a liquid level and temperature switch (13) and an oil level gauge (3).

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