Hydraulic control system of high-speed constant-current closed static pressure workbench

Abstract

The utility model discloses a hydraulic control system of a high-speed constant-flow closed type static pressure working table, which comprises a main guide rail oil supply oil way, an auxiliary guide rail oil supply oil way and a static pressure main shaft oil supply oil way, comprising a filter, a gear pump, a precision oil filter, a speed regulating valve, a pressure sensor, a constant-current equivalent oil distributor, a flow sensor, a pressure gauge and a safety overflow valve, the filter is connected with the gear pump, and the gear pump is connected with the precision oil filter; the precision oil filter is connected with the speed regulating valve and the pressure gauge, the speed regulating valve is connected with the constant-current equivalent oil separator, the pressure sensor is arranged between the speed regulating valve and the constant-current equivalent oil separator, and the flow sensor is arranged on one pipeline of the constant-current equivalent oil separator; the pressure gauge is connected with the safety overflow valve; the hydrostatic spindle oil supply way does not comprise a flow sensor, and other structures are the same as those of the main guide rail oil supply way and the auxiliary guide rail oil supply way. The bearing capacity of the workbench and the rigidity of an oil film can be effectively improved, and high-speed stable operation of the workbench is guaranteed.

Description

Technical Field

[0001] The utility model relates to a high-speed constant-current closed-type static pressure workbench hydraulic control system, belonging to the technical field of hydraulic pressure. Background Art

[0002] With the rapid development of industrial technology, high-precision and high-efficiency machining equipment plays an increasingly important role in the manufacturing industry. As a key component of machining equipment, the performance of the hydrostatic workbench directly affects the machining accuracy and efficiency. The hydrostatic guide rails used in the traditional hydrostatic workbench hydraulic control system are open structures. The pressure oil enters the oil chambers of the guide rails through the throttle to float the moving parts. The guide rail surface is separated by the oil film, and the oil in the oil chamber continuously flows back to the oil tank through the oil sealing edge. When the moving guide rail is subjected to an external load and produces a downward displacement, the guide rail gap becomes smaller, increasing the oil return resistance, and increasing the oil pressure in the oil chamber to balance the external load. Such a structure has problems such as slow response speed, poor oil film stiffness, low stability and high energy consumption, and cannot meet the needs of modern high-precision and high-efficiency machining. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a high-speed constant-current closed static pressure workbench hydraulic control system, which can effectively achieve high-speed, precise and stable movement of the workbench, reduce energy consumption, and improve processing accuracy and efficiency.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a high-speed constant-current closed static pressure workbench hydraulic control system, including a main rail oil supply circuit, an auxiliary rail oil supply circuit and a static pressure spindle oil supply circuit, wherein the main rail oil supply circuit and the auxiliary rail oil supply circuit have the same structure, including a filter, a gear pump, a precision oil filter, a speed regulating valve, a pressure sensor, a constant-current equal-volume oil distributor, a flow sensor, a pressure gauge and a safety overflow valve, the filter is connected to the gear pump through a pipeline, the gear pump is connected to the precision oil filter through a pipeline; the precision oil filter is connected to the speed regulating valve and the pressure gauge through a pipeline On the side of the speed control valve, the speed control valve is connected to the constant flow equal amount oil distributor through a pipeline. A pressure sensor is provided on the pipeline between the constant flow equal amount oil distributor and the speed control valve, and the flow sensor is installed on one of the pipelines of the constant flow equal amount oil distributor; on the side of the pressure gauge, the pressure gauge is connected to the safety relief valve through a pipeline; the hydrostatic spindle oil supply circuit includes a filter, a gear pump, a precision oil filter, a speed control valve, a pressure sensor, a constant flow equal amount oil distributor, a pressure gauge and a safety relief valve. The hydrostatic spindle does not require the detection of the flow sensor, and the rest of the structure is the same as the main rail oil supply circuit and the auxiliary rail oil supply circuit.

[0005] The beneficial effects of the utility model are as follows: the utility model can be used on a vertical machine tool for processing heavy parts, can ensure the operating stability of the workbench with high processing efficiency, and can float the circular guide rail between the static pressure guide rail and the auxiliary static pressure guide rail by adjusting the oil supply flow of the main static pressure guide rail and the auxiliary static pressure guide rail, thereby achieving the purpose of improving the load-bearing capacity of the workbench, the oil film stiffness and improving the high-speed and stable operation of the workbench under the working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0007] Figure 1 It is a schematic diagram of the internal structure of the workbench.

[0008] Figure 2 It is a structural schematic diagram of the utility model.

[0009] Numbers in the figure:

[0010] 1. Filter, 2. Gear pump, 3. Precision oil filter, 4. Speed ​​regulating valve, 5. Pressure sensor, 6. Constant flow equal volume oil distributor, 7. Flow sensor, 8. Pressure gauge, 9. Safety relief valve, 10. Main hydrostatic guide rail, 11. Auxiliary hydrostatic guide rail, 12. Hydrostatic spindle, 13. Hydrostatic oil inlet pipe of main guide plate, 14. Hydrostatic oil inlet pipe of auxiliary guide plate, 15. Hydrostatic spindle oil inlet pipe, 16. Circular guide rail, 17. Workbench. DETAILED DESCRIPTION

[0011] like Figure 1 —2 shows a high-speed constant-current closed-type hydrostatic workbench hydraulic control system, comprising a main rail oil supply circuit, an auxiliary rail oil supply circuit and a hydrostatic spindle oil supply circuit, wherein the main rail oil supply circuit and the auxiliary rail oil supply circuit have the same structure, and include a filter 1, a gear pump 2, a precision oil filter 3, a speed regulating valve 4, a pressure sensor 5, a constant-current equal-volume oil distributor 6, a flow sensor 7, a pressure gauge 8 and a safety relief valve 9, wherein the filter 1 is connected to the gear pump 2 through a pipeline, and the gear pump 2 is connected to the precision oil filter 3 through a pipeline; the precision oil filter 3 is connected to the speed regulating valve 4 and the pressure gauge 8 through a pipeline, and on the speed regulating valve 4 side, the speed regulating valve 4 has a pressure sensor 5, a constant-current equal-volume oil distributor 6, a flow sensor 7, a pressure gauge 8 and a safety relief valve 9, wherein the filter 1 is connected to the gear pump 2 through a pipeline, and the gear pump 2 is connected to the precision oil filter 3 through a pipeline; the precision oil filter 3 is connected to the speed regulating valve 4 and the pressure gauge 8 through a pipeline, and on the speed regulating valve 4 side, the speed regulating valve 4 has a pressure sensor 5, a constant-current equal-volume oil distributor 6, a flow sensor 7, a pressure gauge 8 and a safety relief valve 9, and ... speed regulating valve 4 has a pressure sensor 5, a constant-current equal-volume oil distributor 6, a flow sensor 7, The speed valve 4 is connected to the constant flow equal amount oil distributor 6 through a pipeline. A pressure sensor 5 is provided on the pipeline between the constant flow equal amount oil distributor 6 and the speed regulating valve 4. The flow sensor 7 is installed on one of the pipelines of the constant flow equal amount oil distributor 6; on the side of the pressure gauge 8, the pressure gauge 8 is connected to the safety relief valve 9 through a pipeline; the hydrostatic spindle oil supply circuit includes a filter 1, a gear pump 2, a precision oil filter 3, a speed regulating valve 4, a pressure sensor 5, a constant flow equal amount oil distributor 6, a pressure gauge 8 and a safety relief valve 9. The hydrostatic spindle does not require the detection of the flow sensor 7, and the remaining structures are the same as the main rail oil supply circuit and the auxiliary rail oil supply circuit.

[0012] The high-speed constant-current closed static pressure workbench hydraulic control system is installed inside the workbench 17 of the precision vertical turning and grinding composite machining center. A static pressure spindle is arranged at the center of the base of the workbench 17, and the workbench 17 is sleeved on the static pressure spindle. A circular guide rail 16 is arranged at the bottom of the workbench 17. A main static pressure guide rail 10 and an auxiliary static pressure guide rail 11 for clamping the upper and lower surfaces of the circular guide rail 16 are fixed on the base of the workbench 17. The main static pressure guide rail 10, the auxiliary static pressure guide rail 11 and the static pressure spindle are provided with oil chambers, and are separately supplied with oil by a quantitative gear pump 2. A filter 1 with a pressure difference alarm, a safety overflow valve, a speed regulating valve 4, a pressure sensor 5, a flow sensor 7, a temperature sensor, a constant-current equal-volume oil distributor 7, an industrial oil cooler, an oil heater and other components are arranged in the oil supply system, which can effectively ensure the stability and safety of the oil supply of the hydraulic system.

[0013] During operation, the gear pump 2 supplies oil. The gear pump 2, as the energy source of the system, sucks in the hydrostatic oil and converts the mechanical energy into hydraulic energy. The hydrostatic oil is first coarsely filtered through the filter 1, and then finely filtered through the precision oil filter 3. The flow rate is adjusted by the speed regulating valve 4. After entering the constant flow equal amount oil distributor 6, the oil is injected into the main hydrostatic guide rail 10, the auxiliary hydrostatic guide rail 11 and the hydrostatic spindle 12 through the main guide plate hydrostatic oil inlet pipe 13, the auxiliary guide plate hydrostatic oil inlet pipe 14 and the hydrostatic spindle oil inlet pipe 15. During this period, the pressure sensor 5 detects the oil supply pressure, the flow sensor 7 detects the hydrostatic oil flow of the main hydrostatic guide rail 10 and the auxiliary hydrostatic guide rail 11, and the pressure gauge 8 measures the pressure in the system. When the pressure exceeds the set value, the safety relief valve 9 releases the pressure.

[0014] By adjusting the speed regulating valve 4 to change the amount of oil inlet to the main and auxiliary hydrostatic guide plate oil chambers and the hydrostatic spindle oil chamber, the circular guide rail 16 is floated between the main hydrostatic guide rail 10 and the auxiliary hydrostatic guide rail 11, and an oil film is generated between the hydrostatic spindle and the workbench sleeve, ensuring that the circular guide rail 16 of the workbench 17 does not contact the main hydrostatic guide rail 10, the auxiliary hydrostatic guide rail 11, or the base spindle during operation, and the rotating parts are completely isolated from the fixed parts by the hydrostatic oil film in the axial and radial directions. Monitoring the data of the pressure sensor 5, the flow sensor 7, and the temperature sensor during operation can better control the thickness of the oil film. The industrial oil cooler and heater can ensure the constant state of the oil temperature, especially when the workbench 17 rotates at high speed to neutralize the shear heat of the oil film, so that the hydrostatic workbench can obtain higher operating accuracy.

Claims

1. A high-speed constant-current closed static pressure workbench hydraulic control system, characterized in that: The invention comprises a main rail oil supply circuit, an auxiliary rail oil supply circuit and a static pressure main spindle oil supply circuit, wherein the main rail oil supply circuit and the auxiliary rail oil supply circuit have the same structure, and comprise a filter (1), a gear pump (2), a precision oil filter (3), a speed regulating valve (4), a pressure sensor (5), a constant flow equal volume oil distributor (6), a flow sensor (7), a pressure gauge (8) and a safety relief valve (9), wherein the filter (1) is connected to the gear pump (2) through a pipeline, and the gear pump (2) is connected to the precision oil filter (3) through a pipeline; the precision oil filter (3) is connected to the speed regulating valve (4) and the pressure gauge (8) through a pipeline, and on the speed regulating valve (4) side, the speed regulating valve (4) is connected to the constant flow equal volume oil distributor (6) through a pipeline. The oil separator (6) is connected to the main rail oil separator (6), a pressure sensor (5) is provided on the pipeline between the constant flow equal amount oil separator (6) and the speed regulating valve (4), and a flow sensor (7) is installed on one of the pipelines of the constant flow equal amount oil separator (6); on the side of the pressure gauge (8), the pressure gauge (8) is connected to the safety relief valve (9) through a pipeline; the static pressure spindle oil supply circuit includes a filter (1), a gear pump (2), a precision oil filter (3), a speed regulating valve (4), a pressure sensor (5), a constant flow equal amount oil separator (6), a pressure gauge (8) and a safety relief valve (9); the static pressure spindle does not need to be detected by the flow sensor (7), and the remaining structures are the same as the main rail oil supply circuit and the auxiliary rail oil supply circuit.

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