A hydraulic control system for high-power spinning of vehicle wheel hub

Abstract

The present invention belongs to the field of hydraulic control technology, and specifically relates to a hydraulic control system for high-force spinning of a vehicle wheel hub, comprising a power unit, a hydraulic control unit, an execution unit, a lubrication unit and a measurement and control system; wherein the power unit is used to provide a power source for the entire system; the motor pump group comprises a servo motor and a load-sensitive pump; the hydraulic control unit is used to receive control signals from the measurement and control system to drive the execution unit to work; the lubrication unit is used to lubricate and cool the working elements in the system; the execution unit is used to clamp the wheel hub and perform axial and radial spinning on the wheel hub; the measurement and control system is used to complete the electrical control and testing of the system; the hydraulic control system of the present invention can realize the clamping and spinning feed of the vehicle wheel hub, and the clamping force and spinning feed force can be conveniently adjusted according to different wheel hub spinning processes, and is easy to use and maintain.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a vehicle wheel hub power spinning hydraulic control system. Background Art

[0002] With the rapid development of my country's economic construction, transportation has become the artery of the sustainable development of the national economy. Vehicles are an indispensable part of transportation. The operating conditions of vehicles are complex. The traditional manufacturing process of vehicle wheels is: casting-heat treatment-machining-surface treatment. The surface quality of the wheel produced by this method is poor and the qualified rate is low. In order to solve the above problems, the vehicle wheel manufacturing process currently developed is: casting-spinning-machining-surface treatment. This process greatly improves the manufacturing accuracy, has a denser metallographic structure and better mechanical properties, can well meet the strength requirements of the wheel, has a high qualified rate, is light in weight, has a smooth surface, greatly reduces the machining allowance, and has a relatively low cost. Summary of the invention

[0003] In view of the above shortcomings in the prior art, the present invention provides a vehicle wheel hub high-force spinning hydraulic control system. The system can realize vehicle wheel hub clamping and spinning feed, and the clamping force and spinning feed force can be easily adjusted according to different wheel hub spinning processes, and is easy to use and maintain.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A vehicle wheel hub power spinning hydraulic control system, comprising a power unit, a hydraulic control unit, an execution unit, a lubrication unit and a measurement and control system;

[0006] The power unit includes a hydraulic oil tank device and a motor pump unit, which are used to provide a power source for the entire system; the pump unit includes a servo motor and a load-sensitive pump;

[0007] The hydraulic control unit is used to receive the control signal of the measurement and control system according to the process requirements, complete the corresponding control action, and drive the execution unit to work.

[0008] It includes a one-way valve, a proportional relief valve, a high-pressure oil filter, a pressure sensor, a one-way pressure reducing valve, an electro-hydraulic reversing valve, an electromagnetic reversing valve, a hydraulically controlled one-way valve, a servo valve and a damper; the hydraulic control unit is integrated in the oil circuit;

[0009] A proportional relief valve, connected to the outlet and load-sensing port of the load-sensing pump in the motor pump group, for adjusting the output pressure of the load-sensing pump;

[0010] Pressure sensor, which collects system pressure and feeds it back to the measurement and control system in real time;

[0011] One-way pressure reducing valve, used to adjust the pressure output by the load-sensing pump to low pressure, setting up a low-pressure circuit for the system;

[0012] The servo valve, with its own closed-loop controller, is used to collect the displacement signal of the actuator cylinder to control the movement direction, feed speed and position of the actuator cylinder; it cooperates with the pressure sensor to control the force of the wheel hub spinning;

[0013] The lubrication unit is used to provide lubrication and cooling for the working elements in the system; it includes a lubricating oil tank device, a pump unit, a throttle valve, a pressure valve, a cooler 2, a pressure sensor and an oil suction filter; the pump unit provides lubricating oil, the lubricating oil enters the pump unit through the oil suction filter, is adjusted to the required flow rate through the throttle valve, and enters the components to be lubricated and cooled through the cooler 2; the pressure valve is used to adjust the lubrication pressure;

[0014] The measurement and control system includes a power cabinet and a control cabinet, which are used to complete the electrical control and testing of the system;

[0015] The execution unit is used to press the wheel hub and perform axial and radial spinning on the wheel hub.

[0016] Furthermore, the power unit also includes a cooler 1, a return oil filter and an accumulator. The cooler 1 performs heat exchange with the hydraulic oil of the hydraulic system; the return oil filter is used to filter the hydraulic oil returning from the system; the accumulator cooperates with the pump unit to provide a large flow of hydraulic oil to the system.

[0017] Furthermore, the lubricating oil tank and the hydraulic oil tank are integrated into one device and separated into independent spaces by partitions; the lubricating oil tank device is equipped with air filter 2.

[0018] Furthermore, the execution unit includes a clamping cylinder, an axial feed cylinder and a radial feed cylinder. The clamping cylinder is provided with a clamping assembly, and the clamping assembly is used to clamp the wheel hub onto the rotating spindle; the axial feed cylinder and the radial feed cylinder are respectively connected to the spinning assembly.

[0019] The beneficial effects of the present invention are:

[0020] (1) The control system of the present invention is designed with a graded pre-unloading circuit, which can realize high-pressure and small-flow pre-unloading. When the pressure is unloaded to a certain level, the pre-unloading is carried out at a large flow rate to reduce the unloading impact and ensure the stability of the system during operation.

[0021] (2) The control system of the present invention is designed with high and low pressure circuits, which, combined with the accumulator device, can conveniently realize high and low pressure control;

[0022] (3) The control system of the present invention is designed with a differential circuit, combined with the servo motor speed control and the accumulator device, which can effectively achieve a higher movement speed of the hydraulic cylinder under the condition of minimum system installed power; the present invention can realize differential fast feeding, slow feeding, and working feeding to meet the needs of different processes and procedures;

[0023] (4) The control system of the present invention adopts a servo motor plus a load-sensitive pump to adjust the motor speed and the output flow of the pump according to different working conditions and process requirements, thereby achieving energy saving and consumption reduction to the greatest extent;

[0024] (5) The control system of the present invention is designed in an integrated manner. All components of the hydraulic control unit are integrated in the oil circuit block, which minimizes the pipe connections.

[0025] (6) In the control system of the present invention, the hydraulic oil tank and the lubricating oil tank are designed as an integral whole and are separated into independent oil tanks by partitions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the spinning hydraulic control system of the present invention;

[0027] Figure 2 It is a schematic diagram of differential rapid extension of the clamping cylinder of the spinning hydraulic control system of the present invention;

[0028] Figure 3 It is a schematic diagram of the normal movement and clamping of the clamping cylinder of the spinning hydraulic control system of the present invention;

[0029] Figure 4 It is a schematic diagram of the differential rapid extension of the axial feed cylinder of the spinning hydraulic control system of the present invention;

[0030] Figure 5 It is a schematic diagram of the slow extension of the axial feed cylinder of the spinning hydraulic control system of the present invention;

[0031] Figure 6 It is a schematic diagram of the axial feed cylinder working process of the spinning hydraulic control system of the present invention;

[0032] Figure 7 Schematic diagram of the radial feed cylinder extension of the spinning hydraulic control system of the present invention;

[0033] Figure 8 It is a schematic diagram of the radial feed cylinder working process of the spinning hydraulic control system of the present invention;

[0034] Fig. 9 It is a schematic diagram of the spinning hydraulic control system of the present invention after spinning is completed and retracted;

[0035] Fig.10 This is a schematic diagram of vehicle wheel hub spinning;

[0036] In the figure:

[0037] 1. Power unit; 100. Hydraulic oil tank device; 101. Air filter 1; 110. Motor pump group; 111. Cooler 1; 112. Return oil filter; 113. Accumulator; 2. Hydraulic control unit; 210. Check valve 1; 211. Check valve 2; 212. Check valve 3; 213. Proportional relief valve; 214. High pressure filter; 215. Pressure sensor 1; 216. Pressure sensor 2; 217. Pressure sensor 3; 2 18. Pressure sensor 4; 219. Pressure sensor 5; 220. One-way pressure reducing valve; 221. Electro-hydraulic reversing valve 1; 222. Electro-hydraulic reversing valve 2; 223. Electro-hydraulic reversing valve 3; 224. Electro-hydraulic reversing valve 4; 225. Solenoid reversing valve; 226. Hydraulic control one-way valve; 227. Double-stop electromagnetic ball valve 1; 228. Double-stop electromagnetic ball valve 2; 229. Double-stop electromagnetic ball valve 3; 230. Double-stop electromagnetic ball valve 4; 231. Double-stop electromagnetic Ball valve five; 232, double cut-off electromagnetic ball valve six; 233, double cut-off electromagnetic ball valve seven; 234, double cut-off electromagnetic ball valve eight; 235, double cut-off electromagnetic ball valve nine; 236, single cut-off electromagnetic ball valve one; 237, single cut-off electromagnetic ball valve two; 238, single cut-off electromagnetic ball valve three; 239, servo valve one; 240, servo valve two; 241, damper one; 242, damper two; 3, actuator; 301, clamping cylinder; 302, axial feed cylinder ; 303, radial feed cylinder; 304, clamping assembly; 305, wheel hub; 306, rotating spindle; 307, spinning assembly; 4, lubrication unit; 400, lubricating oil tank device; 401, air filter two; 410, pump unit; 411, throttle valve; 412, pressure valve; 413, cooler two; 414, pressure sensor six; 415, oil suction filter; 5, measurement and control system; 500, power cabinet; 501, control cabinet; 6, partition. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0039] Embodiment: A hydraulic control system for high-power spinning of a vehicle wheel hub, used for controlling high-power spinning of a vehicle wheel hub, mainly comprises a power unit 1, a hydraulic control unit 2, an execution unit 3, a lubrication unit 4 and a measurement and control system 5; the system composition refers to Figure 1 As shown;

[0040] The power unit 1 includes a hydraulic oil tank device 100, a motor pump group 110, a cooler 111, a return oil filter 112 and an accumulator 113. The hydraulic oil tank device 100 is mainly used to store oil, dissipate heat, precipitate impurities in the oil and remove air that escapes and mixes into the oil, and is equipped with an air filter 101. The motor pump group 110 uses a servo motor plus a load-sensitive pump to provide power for the system. The motor speed and the output flow of the pump can be adjusted according to different working conditions and process requirements; the cooler 111 passes cooling water to exchange heat with the hydraulic oil of the hydraulic system, take away heat, and maintain the system working at a suitable temperature. The return oil filter 112 filters the return hydraulic oil in the hydraulic system to prevent impurities from entering the hydraulic oil tank. The accumulator 113 stores pressure oil and is used in conjunction with the motor pump group 110 to provide a large flow of hydraulic oil for the system.

[0041] The hydraulic control unit 2 includes a one-way valve 1 210, a one-way valve 2 211, a one-way valve 3 212, a proportional relief valve 213, a high-pressure oil filter 214, a pressure sensor 1 215, a pressure sensor 2 216, a pressure sensor 3 217, a pressure sensor 4 218, a pressure sensor 5 219, a one-way pressure reducing valve 220, an electro-hydraulic reversing valve 1 221, an electro-hydraulic reversing valve 2 222, an electro-hydraulic reversing valve 3 223, an electro-hydraulic reversing valve 4 224, an electromagnetic reversing valve 225, a hydraulically controlled one-way valve 226, and a double-stop electromagnetic The system is composed of a ball valve 1 227, a double-stop electromagnetic ball valve 2 228, a double-stop electromagnetic ball valve 3 229, a double-stop electromagnetic ball valve 4 230, a double-stop electromagnetic ball valve 5 231, a double-stop electromagnetic ball valve 6 232, a double-stop electromagnetic ball valve 7 233, a double-stop electromagnetic ball valve 8 234, a double-stop electromagnetic ball valve 9 235, a single-stop electromagnetic ball valve 1 236, a single-stop electromagnetic ball valve 2 237, a single-stop electromagnetic ball valve 3 238, a servo valve 1 239, a servo valve 2 240, a damper 1 241, and a damper 2 242. The proportional relief valve 213 connects the outlet and the load-sensitive port of the load-sensitive pump of the motor pump group 110. By adjusting the proportional solenoid DB1 signal, the pressure of the proportional relief valve 213 can be set, thereby adjusting the output pressure of the load-sensitive pump. The high-pressure oil filter 214 prevents impurities from entering the system to ensure the normal operation of the system. Pressure sensor 1 215, pressure sensor 2 216, pressure sensor 3 217, pressure sensor 4 218, and pressure sensor 5 219 collect system pressure and feed back the collected pressure value to the measurement and control system in real time. The one-way pressure reducing valve 220 can adjust the pressure output by the load-sensitive pump to a low pressure and set a low-pressure circuit. Meet the technological requirements of the system; electro-hydraulic reversing valve 1 221, electro-hydraulic reversing valve 2 222, electro-hydraulic reversing valve 3 223, electro-hydraulic reversing valve 4 224, solenoid reversing valve 225, double cut-off solenoid ball valve 1 227, double cut-off solenoid ball valve 2 228, double cut-off solenoid ball valve 3 229, double cut-off solenoid ball valve 4 230, double cut-off solenoid ball valve 5 231, double cut-off solenoid ball valve 6 232, double cut-off solenoid ball valve 7 233, double cut-off solenoid ball valve 8 234, double cut-off solenoid ball valve 9 235, single cut-off solenoid ball valve 1 236, single cut-off solenoid ball valve 2 237, and single cut-off solenoid ball valve 3 238 control the opening, stopping, and switching of the oil. Servo valve 1 239 and servo valve 2 240 are equipped with closed-loop controllers, which can realize the control of the movement direction, feed speed and position of the actuator cylinder by collecting the displacement signal of the actuator cylinder; and can realize the force control of the strong spinning of the wheel hub 305 by collecting the pressure signal of the pressure sensor 4 218 and the pressure sensor 5 219. The hydraulic control check valve 226 allows the hydraulic oil to pass in one direction, and when the control oil is given to its control port, the hydraulic oil can flow freely in the reverse direction.

[0042] The actuator 3 is used to press the hub 305 and perform axial and radial spinning on the hub 305; it includes a pressing cylinder 301, an axial feed cylinder 302 and a radial feed cylinder 303, the pressing cylinder 301 is provided with a pressing assembly 304, the pressing assembly 304 is used to press the hub 305 on the rotating spindle 306; the axial feed cylinder 302 and the radial feed cylinder 303 are respectively connected to the spinning assembly 307 (refer to Fig.10 shown);

[0043] The lubrication unit 4 includes a lubricating oil tank device 400, a pump unit 410, a throttle valve 411, a pressure valve 412, a cooler 413, a pressure sensor 414 and an oil suction filter 415; the lubricating oil tank device 400 is equipped with an air filter 401. The pump unit 410 provides lubricating oil for the components that need to be lubricated and cooled. The lubricating oil enters the pump unit 410 through the oil suction filter 415, and after the required flow is adjusted by the throttle valve 411, it enters the components that need to be lubricated and cooled after passing through the cooler 413, lubricates the components that need to be lubricated and cooled, and takes away excess heat. The lubricating oil finally returns to the lubricating oil tank device 400. The pressure valve 412 is used to adjust the lubrication pressure; the pressure sensor 414 feeds back the lubrication pressure to the measurement and control system 5 in real time; the lubricating oil tank device 400 and the hydraulic oil tank device 100 are designed as a whole, and are separated into independent oil tanks by a partition 6.

[0044] The measurement and control system 5 mainly includes a power cabinet 500 and a control cabinet 501, which complete the electrical control and testing of the measurement and control system. The power cabinet 500 is used to control the start and stop of the servo motor, and the control cabinet 501 is used to receive signals from pressure sensors, displacement sensors, etc., and send control signals according to the process flow and test requirements. The analog signals of the servo motor and other sensors and the switch signals of the related solenoid valves are all processed by the measurement and control system 5.

[0045] The working principle of the control system of the present invention is:

[0046] The motor pump group 110 starts, the proportional relief valve 213 electromagnet DB1 gives a signal, the load-sensitive pump provides pressure oil to the system, and the pressure sensor 1 215 feeds back the system pressure to the measurement and control system 5 in real time. The pressure oil passes through the one-way valve 1 210 and the high-pressure oil filter 214, and then passes through the one-way valve 2 211 to form a high-pressure circuit PH, and then passes through the one-way pressure reducing valve 220 and the electro-hydraulic reversing valve 1 221 to enter the accumulator 113 to form a low-pressure circuit PL. At this time, the system is ready for working.

[0047] The following is a detailed description of the working principle:

[0048] The vehicle wheel hub 305 is placed on the rotating spindle 306, and the servo motor is given a maximum speed. At this time, the motor pump group 110 outputs the maximum flow, the electromagnet DT3 of the electro-hydraulic reversing valve 222 is energized, and the electromagnet DT6 of the double-stop electromagnetic ball valve 230 is energized. The hydraulic oil enters the rodless chamber of the clamping cylinder 301 through the electro-hydraulic reversing valve 222 and the hydraulically controlled one-way valve 226. The hydraulic oil in the rod chamber of the clamping cylinder 301 also reaches the rodless chamber of the clamping cylinder 301 through the double-stop electromagnetic ball valve 230, forming a differential circuit. The clamping cylinder 301 extends quickly, driving the clamping assembly 304 to quickly approach the wheel hub 305 (such as Figure 2 As shown). After the clamping assembly 304 quickly approaches the wheel hub 305, as the clamping cylinder 301 continues to extend, the pressure detected by the pressure sensor 3 217 gradually increases. When it increases to 5MPa, the measurement and control system 5 controls the servo motor to decelerate to the rated speed, the electromagnet DT5 of the single-stop electromagnetic ball valve 1 236 is energized, and the electromagnet DT6 of the double-stop electromagnetic ball valve 4 230 is de-energized. The hydraulic oil in the rod chamber of the clamping cylinder 301 returns to the hydraulic oil tank device 100 through the return oil pipeline (as shown in FIG. Figure 3 At this time, the clamping force continues to increase. When the pressure sensor 3 217 detects that the set pressure has been reached, the electromagnet DT5 of the single-stop electromagnetic ball valve 1 236 loses power, and the electromagnet DT3 of the electro-hydraulic reversing valve 2 222 loses power. The hydraulic oil is sealed in the rodless chamber of the clamping cylinder 301 by the hydraulically controlled one-way valve 226, and the clamping force is maintained, so that the wheel hub 305 is pressed against the rotating spindle 306, and preparations are made for the strong spinning of the wheel hub 305.

[0049] After the rotating main shaft 306 rotates, it drives the wheel hub 305 to rotate. The servo motor is given a maximum speed, at which time the motor pump group 110 outputs the maximum flow, the electromagnet DT8 of the electro-hydraulic reversing valve three 223 is energized, the electromagnet DT12 of the double-stop electromagnetic ball valve five 231 is energized, and the hydraulic oil output by the motor pump group 110 and the hydraulic oil stored in the accumulator 113 enter the rodless cavity of the axial feed cylinder 302 through the electro-hydraulic reversing valve three 223, and the hydraulic oil in the rod cavity of the axial feed cylinder 302 also reaches the rodless cavity of the axial feed cylinder 302 through the double-stop electromagnetic ball valve five 231, forming a differential circuit, and the axial feed cylinder 302 quickly extends, driving the spinning assembly 307 to quickly approach the rotating wheel hub 305 axially (such as Figure 4 When the axial feed cylinder 302 moves to the set position, the displacement sensor YL1 of the axial feed cylinder 302 sends a signal, the servo motor decelerates to the rated speed, the electromagnet DT12 of the double-stop electromagnetic ball valve 5 231 loses power, and the electromagnet DT10 of the single-stop electromagnetic ball valve 2 237 is energized. The hydraulic oil in the rod chamber of the axial feed cylinder 302 returns to the hydraulic oil tank device 100 through the return oil pipeline, and the axial feed cylinder 302 extends relatively slowly, driving the spinning assembly 307 to slowly approach the rotating hub 305 axially (as shown in FIG. Figure 5As shown). When it moves to the set position, when the spinning assembly 307 contacts the upper hub 305, a signal is sent through the displacement sensor YL1 of the axial feed cylinder 302, the electromagnet DT8 of the electro-hydraulic reversing valve three 223 loses power, the electromagnet DT10 of the single-stop electromagnetic ball valve two 237 loses power, the electromagnet DT13 of the double-stop electromagnetic ball valve one 227 is energized, the electromagnet DT14 of the double-stop electromagnetic ball valve four 230 is energized, the electromagnet DT15 of the double-stop electromagnetic ball valve seven 233 is energized, the electromagnet BL2 of the servo valve one 239 is given a signal, the electromagnet DT1 of the electro-hydraulic reversing valve one 221 is energized, the hydraulic oil output by the motor pump group 110 enters the rodless cavity of the axial feed cylinder 302 through the high-pressure circuit, the axial feed cylinder 302 extends forward, and drives the spinning assembly 307 to axially feed forward (as shown in FIG. Figure 6 As shown). With the continuous feeding, the axial feed force continues to increase, the system pressure rises, and the pressure sensor 218 feeds back the pressure to the measurement and control system 5 in real time. The measurement and control system 5 gives a control signal in real time according to the target value and the actual value, adjusts the given signal of the given servo valve 239 electromagnet BL2 and BL1, and switches the direction and adjusts the hydraulic oil in and out of the rodless cavity and the rod cavity of the axial feed cylinder 302 to meet the spinning needs of the wheel hub 305, and then converts to closed-loop control of the force. The above is the axial feed control of the vehicle wheel hub spinning.

[0050] After the rotating main shaft 306 rotates, it drives the wheel hub 305 to rotate. The servo motor is given a maximum speed, and the electromagnet DT16 of the electro-hydraulic reversing valve 4224 is energized. The hydraulic oil output by the motor pump group 110 and the hydraulic oil stored in the accumulator 113 enter the rodless cavity of the radial feed cylinder 303 through the electro-hydraulic reversing valve 4224. The hydraulic oil in the rod cavity of the radial feed cylinder 303 returns to the hydraulic oil tank device 100 through the electro-hydraulic reversing valve 4224. The radial feed cylinder 303 extends, driving the spinning assembly 307 to axially approach the rotating wheel hub 305 (such as Figure 7 As shown). When it moves to the set position, when the spinning assembly 307 contacts the upper wheel hub 305, a signal is sent through the displacement sensor YL2 of the radial feed cylinder 303, the electromagnet DT16 of the electro-hydraulic reversing valve 4 224 loses power, the electromagnet DT18 of the double-stop electromagnetic ball valve 2 228 is energized, the electromagnet DT16 of the double-stop electromagnetic ball valve 8 234 is energized, the electromagnet DT17 of the double-stop electromagnetic ball valve 9 235 is energized, the electromagnet BL4 of the servo valve 2 240 is given a signal, the electromagnet DT1 of the electro-hydraulic reversing valve 1 221 is energized, and the hydraulic oil output by the motor pump group 110 enters the rodless cavity of the radial feed cylinder 303 through the high-pressure circuit, and the radial feed cylinder 303 extends forward, driving the spinning assembly 307 to radially feed forward (as shown in FIG. Figure 8As shown). With the continuous working feed, the radial feed force continues to increase, the system pressure rises, and the pressure sensor 5 219 feeds back the pressure to the measurement and control system 5 in real time. The measurement and control system 5 gives a control signal in real time according to the target value and the actual value, adjusts the given signal of the given servo valve 2 240 electromagnet BL4 and BL3, and satisfies the spinning needs of the wheel hub 305 by switching the direction and adjusting the hydraulic oil in and out of the rodless cavity and the rod cavity of the radial feed cylinder 303. At this time, it is converted into a closed-loop control of the force. The above is the radial feed control of the vehicle wheel hub spinning.

[0051] In the actual working process, axial feed and radial feed are compound motions, and their control logic is consistent with the above description.

[0052] When the wheel hub 305 of the vehicle is spun, the measurement and control system 5 gives a signal, the servo motor is given a rated speed, the electromagnet DT11 of the single-stop electromagnetic ball valve 3 238 is energized, and the hydraulic oil in the rodless chamber of the axial feed cylinder 302 passes through the single-stop electromagnetic ball valve 3 238, the damper 2 242 and the return oil pipeline to return to the hydraulic oil tank device 100, so as to realize small-flow, low-impact pre-unloading, and the pressure in the rodless chamber of the axial feed cylinder 302 gradually decreases, and the pressure sensor 4 218 feeds the pressure back to the measurement and control system 5. When the measurement and control system 5 detects that the pressure drops to the set value, the electromagnet DT9 of the electro-hydraulic reversing valve 3 223 is energized, and the hydraulic oil and the storage tank output by the motor pump group 110 are The hydraulic oil stored in the accumulator 113 enters the rod chamber of the axial feed cylinder 302 through the electro-hydraulic reversing valve three 223, and the hydraulic oil in the rodless chamber of the axial feed cylinder 302 returns to the hydraulic oil tank device 100 through the electro-hydraulic reversing valve three 223 and the return oil pipeline, and the axial feed cylinder 302 retracts; at the same time, the electromagnet DT17 of the electro-hydraulic reversing valve four 224 is energized, and the hydraulic oil output by the motor pump group 110 and the hydraulic oil stored in the accumulator 113 enter the rod chamber of the radial feed cylinder 303 through the electro-hydraulic reversing valve four 224, and the hydraulic oil in the rodless chamber of the radial feed cylinder 303 returns to the hydraulic oil tank device 100 through the electro-hydraulic reversing valve four 224 and the return oil pipeline, and the radial feed cylinder 303 retracts. At this time, the spinning assembly 307 is separated from the vehicle wheel hub 305, the electromagnet DT7 of the double-stop electromagnetic ball valve 3 229 is energized, and the hydraulic oil in the rodless chamber of the clamping cylinder 301 passes through the double-stop electromagnetic ball valve 3 229, the damper 1 241 and the return oil pipeline to return to the hydraulic oil tank device 100, realizing small-flow, low-impact pre-unloading, and the pressure in the rodless chamber of the clamping cylinder 301 gradually decreases, and the pressure sensor 3 217 feeds back the pressure to the measurement and control system 5. When the measurement and control system 5 detects that the pressure drops to the set value, the electromagnet DT2 of the electromagnetic reversing valve 225 is energized, and the hydraulic oil enters the control port of the hydraulically controlled one-way valve 226, and the hydraulically controlled one-way valve 226 is opened in the reverse direction. The hydraulic oil in the rodless chamber of the clamping cylinder 301 passes through the double-stop electromagnetic ball valve 3 The magnetic ball valve 3 229, the damper 1 241, the hydraulically controlled one-way valve 226 and the return oil pipeline return to the hydraulic oil tank device 100 to achieve large-flow, low-impact pre-unloading. The pressure in the rodless chamber of the clamping cylinder 301 is further reduced, and the pressure sensor 3 217 feeds back the pressure to the measurement and control system 5. When the measurement and control system 5 detects that the pressure is reduced to the set value, the electromagnet DT4 of the electro-hydraulic reversing valve 2 222 is energized, and the hydraulic oil output by the motor pump group 110 and the hydraulic oil stored in the accumulator 113 enter the rod chamber of the clamping cylinder 301 through the electro-hydraulic reversing valve 2 222. The hydraulic oil in the rodless chamber of the clamping cylinder 301 passes through the electro-hydraulic reversing valve 3 223 and the return oil pipeline and returns to the hydraulic oil tank device 100, and the clamping cylinder 301 retracts (such as Fig. 9As shown). When the clamping cylinder 301 and the feed cylinder are retracted to their positions, the electromagnets of the above retraction action are all de-energized, locking the clamping cylinder 301 and the feed cylinder, and the servo motor is given a rated speed. The hydraulic oil output by the motor pump group 110 enters the accumulator 113 through the electro-hydraulic reversing valve 1 221 to store energy, preparing for the next spinning process. When the energy is stored to the set pressure, the pressure sensor 2 216 transmits the detected pressure to the measurement and control system 5, and the measurement and control system 5 sends a signal, the servo motor has a minimum speed, the load-sensitive pump has a minimum flow rate, and enters a standby state. At this time, the spun wheel hub 305 can be taken out.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic control system for high-power spinning of vehicle wheel hubs, characterized in that: It includes power unit, hydraulic control unit, execution unit, lubrication unit and measurement and control system; The power unit includes a hydraulic oil tank device and a motor pump group, which are used to provide a power source for the entire system; the motor pump group includes a servo motor and a load-sensitive pump; The hydraulic control unit is used to receive the control signal of the measurement and control system and drive the execution unit to work; It includes a one-way valve, a proportional relief valve, a high-pressure oil filter, a pressure sensor, a one-way pressure reducing valve, an electro-hydraulic reversing valve, an electromagnetic reversing valve, a hydraulically controlled one-way valve, a servo valve and a damper; the hydraulic control unit is integrated in the oil circuit; A proportional relief valve connected to the outlet of the load-sensing pump in the motor pump group and the load-sensing port to adjust the output pressure of the load-sensing pump; Pressure sensor, which collects system pressure and feeds it back to the measurement and control system in real time; One-way pressure reducing valve, used to adjust the pressure output by the load-sensing pump to low pressure, setting up a low-pressure circuit for the system; The pressure sensor 1 feeds back the system pressure to the measurement and control system in real time. After the pressure oil passes through the one-way valve 1 and the high-pressure oil filter, it passes through the one-way valve 2 to form a high-pressure circuit PH, and then passes through the one-way pressure reducing valve and the electro-hydraulic reversing valve 1 to enter the accumulator to form a low-pressure circuit PL. The servo valve, with its own closed-loop controller, is used to collect the displacement signal of the actuator cylinder to control the movement direction, feed speed and position of the actuator cylinder; it cooperates with the pressure sensor to control the force of the wheel hub spinning; The lubrication unit is used to lubricate and cool the working elements in the system; It includes a lubricating oil tank device, a pump unit, a throttle valve, a pressure valve, a cooler 2, a pressure sensor and an oil suction filter; the pump unit provides lubricating oil, the lubricating oil enters the pump unit through the oil suction filter, is adjusted to the required flow rate through the throttle valve, and enters the components to be lubricated and cooled through the cooler 2; the pressure valve is used to adjust the lubricating pressure; The measurement and control system includes a power cabinet and a control cabinet, which are used to complete the electrical control and testing of the system; The execution unit is used to press the wheel hub and perform axial and radial spinning on the wheel hub; The servo motor is given the maximum speed, the motor pump group outputs the maximum flow, the electromagnet DT3 of the electro-hydraulic reversing valve 2 is energized, the electromagnet DT6 of the double-stop electromagnetic ball valve 4 is energized, and the hydraulic oil enters the rodless chamber of the clamping cylinder through the electro-hydraulic reversing valve 2 and the hydraulic control one-way valve. The hydraulic oil in the rod chamber of the clamping cylinder also reaches the rodless chamber of the clamping cylinder through the double-stop electromagnetic ball valve 4, forming a differential circuit; When the wheel hub spinning of the vehicle is completed, the measurement and control system gives a signal, the servo motor is given a rated speed, the electromagnet DT11 of the single-stop electromagnetic ball valve 3 is energized, and the hydraulic oil in the rodless chamber of the axial feed cylinder passes through the single-stop electromagnetic ball valve 3, the damper 2 and the return oil pipeline to return to the hydraulic oil tank device, realizing small flow and low impact pre-unloading; When the measurement and control system detects that the pressure drops to the set value, the electromagnet DT2 of the electromagnetic reversing valve is energized, and the hydraulic oil enters the control port of the hydraulically controlled one-way valve, opening the hydraulically controlled one-way valve in reverse. The hydraulic oil in the rodless chamber of the clamping cylinder passes through the double-cut-off electromagnetic ball valve 3, the damper 1, the hydraulically controlled one-way valve and the return oil pipeline and returns to the hydraulic oil tank device, realizing large-flow, low-impact pre-unloading.

2. A vehicle wheel hub power spinning hydraulic control system according to claim 1, characterized in that: The power unit also includes a cooler 1, a return oil filter and an accumulator. The cooler 1 performs heat exchange with the hydraulic oil of the hydraulic system; the return oil filter is used to filter the hydraulic oil returning from the system; the accumulator cooperates with the pump unit to provide a large flow of hydraulic oil for the system.

3. A vehicle wheel hub power spinning hydraulic control system according to claim 1, characterized in that: The lubricating oil tank and the hydraulic oil tank are integrated in one device and separated into independent spaces by partitions.

4. A vehicle wheel hub power spinning hydraulic control system according to claim 1, characterized in that: The execution unit comprises a clamping cylinder, an axial feed cylinder and a radial feed cylinder. The clamping cylinder is provided with a clamping assembly, and the clamping assembly is used to clamp the wheel hub onto the rotating spindle. The axial feed cylinder and the radial feed cylinder are respectively connected to the spinning assembly.

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