Intelligent quick rail grinding wagon millstone constant-pressure loading hydraulic system

Abstract

The utility model discloses a grinding stone constant-pressure loading hydraulic system of an intelligent rapid steel rail grinding wagon, which relates to the technical field of grinding equipment and comprises a grinding stone loading oil cylinder and a grinding stone floating pressurization constant-pressure control unit. The millstone floating pressurization constant-pressure control unit comprises a constant-pressure control oil way connected between a rodless cavity oil port of the millstone loading oil cylinder and a rod cavity oil port of the millstone loading oil cylinder, and a second electromagnetic ball valve and a first one-way throttle valve are sequentially installed from the inlet end of the constant-pressure control oil way to the outlet end of the constant-pressure control oil way. The inlet end of the second electromagnetic ball valve is further connected with a three-way proportional pressure reducing valve and a first overflow valve in parallel, an oil return opening of the three-way proportional pressure reducing valve is communicated with an oil return opening of the first overflow valve, and the oil return opening of the first overflow valve is connected with the oil tank. The millstone floating pressurization constant-pressure control unit further comprises a liquid supplementing oil way connected between the power unit and the constant-pressure control oil way, and the three-way proportional pressure reducing valve is installed on the liquid supplementing oil way. Various complex and changeable working conditions of polishing operation are overcome, the hydraulic control requirement during polishing operation is met, the polishing function is achieved, the polishing effect is guaranteed, and the polishing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding equipment, and particularly relates to a hydraulic system for constant pressure loading of grinding stones of an intelligent rapid rail grinding vehicle. Background Art

[0002] The intelligent rapid rail grinding vehicle is an important affiliated equipment for railway track maintenance, inspection and maintenance. Among them, the grinding mechanism is the core component for the intelligent rapid rail grinding vehicle to perform rapid grinding operations. The grinding mechanism has a series of grinding stones. Each grinding stone not only needs to rotate passively, but also is set at a fixed angle with the track. When the grinding stones are dragged along the rail, they rotate by themselves and at the same time generate relative movement with the rail surface, and this relative movement realizes the grinding of the rail surface.

[0003] At present, in the grinding mechanism of the intelligent rapid rail grinding vehicle, a hydraulic control system drives two sets of four-bar linkages through a loading oil cylinder, so as to realize the lifting, lowering, floating pressurization and constant force loading control of the grinding stones, that is, to realize the extension, contraction, floating and constant pressure control of the oil cylinder. Therefore, a stable and reliable hydraulic system is very important for the operation safety and operation effect of the grinding stones.

[0004] Due to the particularity of rail grinding operations, it is required to have high grinding efficiency and fast speed, and the road conditions in actual grinding change randomly to a large extent, making the grinding conditions very complex and harsh. Therefore, under different road conditions, different grinding process parameters such as grinding speed and grinding pressure are required to match; at the same time, during the grinding operation, due to the rail corrugation, the grinding stones continuously float up and down, and thus the volumes and pressure differences of the two chambers of the loading oil cylinder fluctuate, and the fluctuation mode follows the fluctuation mode of the rail corrugation. In order to ensure the working quality, the constant pressure loading system must have good dynamic performance.

[0005] In the existing hydraulic control system for controlling the grinding mechanism, a proportional relief valve is usually used to control the loading. During the grinding operation, the proportional relief valve is always in the open state, resulting in overflow loss and serious system heating, which cannot meet the control requirements of the grinding operation hydraulic system. Summary of the Utility Model

[0006] In order to adapt to different road conditions, the grinding mechanism can match different grinding process parameters (such as adjustable grinding pressure, etc.), and at the same time ensure that the grinding pressure output is constant in the same grinding operation mode, the utility model provides a hydraulic system for constant pressure loading of grinding stones of an intelligent rapid rail grinding vehicle to solve the above problems.

[0007] To achieve the object of the present utility model, the technical solution adopted is as follows: An intelligent and rapid rail grinding vehicle grinding stone constant pressure loading hydraulic system, including a power unit, a proportional valve, a grinding stone loading oil cylinder, and a grinding stone floating pressurization constant pressure control unit. The pressure oil port of the proportional valve is connected to the power unit, the return oil port of the proportional valve is connected to the oil tank, and balance valves are provided between the two working oil ports of the proportional valve and the rodless cavity oil port and the rod cavity oil port of the grinding stone loading oil cylinder. The grinding stone floating pressurization constant pressure control unit includes a constant pressure control oil circuit connected between the rodless cavity oil port and the rod cavity oil port of the grinding stone loading oil cylinder. An electromagnetic ball valve II and a one-way throttle valve I are successively installed from the inlet end to the outlet end of the constant pressure control oil circuit. A three-way proportional pressure reducing valve and a relief valve I are also connected in parallel at the inlet end of the electromagnetic ball valve II. The return oil port of the three-way proportional pressure reducing valve is communicated with the return oil port of the relief valve I, and the return oil port of the relief valve I is connected to the oil tank. The grinding stone floating pressurization constant pressure control unit further includes a liquid supplement oil circuit connected between the power unit and the constant pressure control oil circuit, and the three-way proportional pressure reducing valve is installed on the liquid supplement oil circuit.

[0008] Furthermore, it further includes a pressure maintaining energy storage control unit. The pressure maintaining energy storage control unit includes an accumulator II. The accumulator II is connected to the liquid supplement oil circuit through a pressure maintaining oil circuit, and an electromagnetic ball valve IV is also installed on the pressure maintaining oil circuit.

[0009] Furthermore, a relief valve II and a high-pressure ball valve II are connected in parallel on the pressure maintaining oil circuit, and the return oil port of the relief valve II and the outlet end of the high-pressure ball valve II are both connected to the oil tank.

[0010] Furthermore, a one-way valve II is installed at the inlet end of the liquid supplement oil circuit.

[0011] Furthermore, the grinding stone floating pressurization constant pressure control unit further includes an unloading oil circuit. The two ends of the unloading oil circuit are respectively connected in parallel between the inlet end of the electromagnetic ball valve II and the outlet end of the one-way throttle valve I. A high-pressure ball valve I is installed on the unloading oil circuit, and the unloading oil circuit is connected to the oil tank. A one-way valve III is also connected between the unloading oil circuit and the oil tank.

[0012] Furthermore, an accumulator I is connected in parallel on the constant pressure control oil circuit.

[0013] Furthermore, an electromagnetic ball valve I is installed between the rodless cavity oil port of the grinding stone loading oil cylinder and the inlet end of the constant pressure control oil circuit. A one-way throttle valve II and an electromagnetic ball valve III are also installed between the outlet end of the constant pressure control oil circuit and the rod cavity oil port of the grinding stone loading oil cylinder.

[0014] Furthermore, there are multiple grinding stone loading oil cylinders and multiple proportional valves, and the multiple grinding stone loading oil cylinders correspond to the multiple proportional valves one by one. An electromagnetic ball valve I is installed between the rodless cavity oil port of each grinding stone loading oil cylinder and the inlet end of the constant pressure control oil circuit, and a one-way throttle valve II and an electromagnetic ball valve III are installed at the rod cavity oil port of each grinding stone loading oil cylinder and the outlet end of the constant pressure control oil circuit.

[0015] Further, a plurality of the proportional valves are controlled by a CAN bus.

[0016] Further, the power unit includes two oil pump motor groups connected in parallel with the fuel tank, and one-way valves are installed at the oil outlets of both oil pump motor groups.

[0017] The beneficial effects of the present utility model are as follows:

[0018] Since the grinding process of the intelligent rapid rail grinding vehicle is a process of continuously filling and discharging liquid from the control valve to the loading chamber (rodless chamber) of the grinding stone loading cylinder, in the present utility model, a three-way proportional pressure reducing valve is connected in parallel at the inlet end of the electromagnetic ball valve II in the grinding stone floating pressurization constant pressure control unit. When the loading chamber (rodless chamber) of the grinding stone loading cylinder needs to be filled with liquid, the oil inlet and the oil outlet of the three-way proportional pressure reducing valve are connected, and the oil return port of the three-way proportional pressure reducing valve is closed. At this time, the three-way proportional pressure reducing valve provides pressure oil for the loading chamber (rodless chamber). When the loading chamber (rodless chamber) of the grinding stone loading cylinder needs to discharge liquid, the oil inlet of the three-way proportional pressure reducing valve is closed, and the oil outlet and the oil return port of the three-way proportional pressure reducing valve are connected. While the three-way proportional pressure reducing valve overflows the excess oil in the loading chamber (rodless chamber) of the grinding stone loading cylinder, it ensures that the pressure in the loading chamber (rodless chamber) of the grinding stone loading cylinder remains constant.

[0019] In the present utility model, an accumulator I is connected in parallel on the constant pressure control oil circuit. The accumulator I can be used to absorb the high-pressure hydraulic oil generated by the hydraulic shock during the grinding operation of the loading chamber (rodless chamber) of the grinding stone loading cylinder, and can replenish oil to the rod chamber of the grinding stone loading cylinder through the replenishing oil circuit connected in parallel on the constant pressure control oil circuit to prevent the grinding stone loading cylinder from sucking air.

[0020] In the present utility model, a relief valve I is connected in parallel on the constant pressure control oil circuit. The relief valve I is used as a safety valve, which increases the safety redundancy of the system and ensures the safety and reliability of the grinding operation.

[0021] The present utility model overcomes various complex and changeable working conditions of the grinding operation, solves the hydraulic control requirements during the grinding operation, realizes the grinding function, ensures the grinding effect, and improves the grinding efficiency. Description of the Drawings

[0022] The drawings illustrate exemplary embodiments of the present utility model and, together with the description thereof, are used to explain the principles of the present utility model. These drawings are included to provide a further understanding of the present utility model, and the drawings are included in this specification and form a part of this specification.

[0023] Figure 1 It is a system diagram of the grinding stone constant pressure loading hydraulic system of the intelligent rapid rail grinding vehicle provided by the present utility model.

[0024] Marks in the drawings and corresponding component names:

[0025] 1. Fuel tank, 2. Oil pump motor set, 3. Check valve I, 4. Check valve II, 5. Proportional valve, 6. Constant pressure control oil circuit, 7. Make-up oil circuit, 8. Unloading oil circuit, 9. Pressure-holding energy storage control unit, 10. Grinding stone floating pressurization constant pressure control unit, 11. Grinding stone loading oil cylinder, 12. Balance valve, 13. Check valve III;

[0026] 901. Electromagnetic ball valve IV, 902. Relief valve II, 903. Accumulator II, 904. Pressure sensor II, 905. High-pressure ball valve II, 906. Pressure-holding oil circuit;

[0027] 101. One-way throttle valve I, 102. Electromagnetic ball valve II, 103. High-pressure ball valve I, 104. Pressure sensor I, 105. Relief valve I, 106. High-pressure ball valve III, 107. Accumulator I, 108. Three-way proportional pressure reducing valve, 109. Pressure sensor III, 1010. Electromagnetic ball valve I, 1011. One-way throttle valve II, 1012. Electromagnetic ball valve III. Detailed implementation manners

[0028] The present utility model will be further described in detail below in conjunction with the drawings and implementation manners. It can be understood that the specific implementation manners described herein are only used to explain the relevant content and do not limit the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings.

[0029] It should be noted that, without conflict, the implementation manners and features in the implementation manners of the present utility model can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the implementation manners.

[0030] As Figure 1As shown in the figure, an intelligent and fast rail grinding vehicle grinding stone constant pressure loading hydraulic system provided by the utility model includes a power unit, a proportional valve 5, a grinding stone loading oil cylinder 11, and a grinding stone floating pressurization constant pressure control unit 10. The power unit is used to provide hydraulic oil. Among them, the pressure oil port of the proportional valve 5 is connected to the power unit, the return oil port of the proportional valve 5 is connected to the oil tank 1, and a balance valve 12 is arranged between the two working oil ports of the proportional valve 5 and the rodless cavity oil port and the rod cavity oil port of the grinding stone loading oil cylinder 11. Among them, the proportional multi-way valve is used to control the lifting and lowering of the grinding stone loading oil cylinder 11; the grinding stone loading oil cylinder 11 is used for the execution of grinding stone lifting, lowering, and pressurization, and an MTS magnetostrictive displacement sensor is built in the grinding stone loading oil cylinder 11 to detect the stroke of the grinding stone loading oil cylinder 11 and feedback the detected data to the electronic control system for the closed-loop synchronous control of the grinding stone loading oil cylinder 11, ensuring the synchronous accuracy of the lifting / lowering process of the grinding stone loading oil cylinder 11 and meeting the functional requirements of the grinding operation mechanism; the balance valve 12 is used to hold the position after the grinding stone loading oil cylinder 11 drives the grinding stone to lift and lower in place, ensuring the smoothness of the lifting and lowering process of the grinding stone loading oil cylinder 11.

[0031] The grinding stone floating pressurization constant pressure control unit 10 is used for grinding stone floating loading and constant pressure control to ensure the functional requirements of liquid filling and liquid discharging in the rodless cavity of the grinding stone loading oil cylinder 11 during the grinding operation process; the grinding stone floating pressurization constant pressure control unit 10 includes a constant pressure control oil circuit 6 connected between the rodless cavity oil port and the rod cavity oil port of the grinding stone loading oil cylinder 11. It should be noted here that the rodless cavity oil port of the grinding stone loading oil cylinder 11 is the oil port connected to the rodless cavity of the grinding stone loading oil cylinder 11, and the rod cavity oil port of the grinding stone loading oil cylinder 11 is the oil port connected to the rod cavity of the grinding stone loading oil cylinder 11.

[0032] An electromagnetic ball valve two 102 and a one-way throttle valve one 101 are sequentially installed from the inlet end to the outlet end of the constant pressure control oil circuit 6. Among them, the inlet end of the constant pressure control oil circuit 6 is the end where the constant pressure control oil circuit 6 is connected to the rodless cavity oil port of the grinding stone loading oil cylinder 11, and the outlet end of the constant pressure control oil circuit 6 is the end where the constant pressure control oil circuit 6 is connected to the rod cavity oil port of the grinding stone loading oil cylinder 11; the electromagnetic ball valve two 102 is used for the unloading control of the grinding stone loading oil cylinder 11 after the grinding is completed; the one-way throttle valve one 101 is used to increase buffering when the grinding stone loading oil cylinder 11 unloads to avoid hydraulic shock.

[0033] A three-way proportional pressure reducing valve 108 and a first overflow valve 105 are also connected in parallel to the constant pressure control oil circuit 6. The three-way proportional pressure reducing valve 108 and the first overflow valve 105 are both located at the inlet end of the second electromagnetic ball valve 102. The first overflow valve 105 is connected in parallel between the three-way proportional pressure reducing valve 108 and the second electromagnetic ball valve 102. The oil return port of the three-way proportional pressure reducing valve 108 is communicated with the oil return port of the first overflow valve 105, and the oil return port of the first overflow valve 105 is connected to the oil tank 1. Among them, the three-way proportional pressure reducing valve 108 is used to control the output of a continuously adjustable constant pressure, ensuring that a corresponding constant oil pressure for different road conditions can be set and output in different road conditions, realizing the one-to-one correspondence between the grinding force and different road conditions, and ensuring the best grinding effect; the first overflow valve 105 is used as a safety valve and is a redundant overload protection valve for the constant pressure control unit 10 of the floating pressure addition of the grinding stone.

[0034] The constant pressure control unit 10 for the floating pressure addition of the grinding stone further includes a liquid supplementing oil circuit 7 connected between the power unit and the constant pressure control oil circuit 6. The oil inlet and the oil outlet of the three-way proportional pressure reducing valve 108 are both connected to the liquid supplementing oil circuit 7, and the oil outlet of the three-way proportional pressure reducing valve 108 is connected in parallel to the constant pressure control oil circuit 6 through the liquid supplementing oil circuit 7.

[0035] As a further option in this embodiment, the intelligent rapid rail grinding vehicle grinding stone constant pressure loading hydraulic system further includes a pressure maintaining and energy storage control unit 9. The pressure maintaining and energy storage control unit 9 ensures that a stable oil source can be provided during the grinding operation. At the same time, it is not necessary for the oil pump motor group 2 to operate at high pressure all the time, so that the oil pump motor group 2 only starts intermittently, avoiding abnormal heating of the system and playing a role in energy conservation and consumption reduction; the pressure maintaining and energy storage control unit 9 provides a stable hydraulic oil source for the constant pressure control unit 10 of the floating pressure addition of the grinding stone; the pressure maintaining and energy storage control unit 9 includes a second accumulator 903, and the second accumulator 903 is used for oil storage and release, and the second accumulator 903 is connected to the liquid supplementing oil circuit 7 through a pressure maintaining oil circuit 906; at the same time, an electromagnetic ball valve four 901 is also installed on the pressure maintaining oil circuit 906, and the electromagnetic ball valve four 901 is used for oil filling and discharging control.

[0036] As a further option in this embodiment, a second overflow valve 902 and a second high-pressure ball valve 905 are also connected in parallel to the pressure maintaining oil circuit 906. The oil return port of the second overflow valve 902 and the outlet end of the second high-pressure ball valve 905 are both connected to the oil tank 1; the second overflow valve 902 is used as a safety valve to avoid damage to the second accumulator 903 and safety accidents caused by the power unit continuously filling the second accumulator 903 with liquid when the system is abnormal; the second high-pressure ball valve 905 is used for pressure unloading during the maintenance of the pressure maintaining and energy storage control unit 9, so that the oil can be discharged back to the oil tank 1. In order to facilitate the real-time monitoring and control of the pressure of the pressure maintaining and energy storage control unit 9, a second pressure sensor 904 can also be installed in parallel on the pressure maintaining oil circuit 906, and the filling control signal of the second accumulator 903 can also be controlled through the pressure detection result of the second pressure sensor 904.

[0037] As a further option in this embodiment, a second one-way valve 4 is also installed at the inlet end of the liquid supplement oil circuit 7. The second one-way valve 4 is used to cut off the connection between the pressure maintaining energy storage control unit 9 circuit and other circuits, ensure that the released oil is all used for the pressure maintaining of the grindstone loading oil cylinder 11, reduce internal leakage, and improve the pressure maintaining effect.

[0038] As a further option in this embodiment, the grindstone floating pressurization constant pressure control unit 10 further includes an unloading oil circuit 8. One end of the unloading oil circuit 8 is connected in parallel between the first overflow valve 105 and the second electromagnetic ball valve 102, and the other end of the unloading oil circuit 8 is connected in parallel between the first one-way throttle valve 101 and the second one-way throttle valve 1011. A first high-pressure ball valve 103 is installed on the unloading oil circuit 8, and the first high-pressure ball valve 103 is used for manual unloading of the grindstone loading oil cylinder 11 during maintenance. At the same time, the unloading oil circuit 8 is connected to the fuel tank 1, and a third one-way valve 13 is also connected between the unloading oil circuit 8 and the fuel tank 1. The third one-way valve 13 can ensure the back pressure of the liquid supplement oil circuit 7, so as to ensure that the rodless cavity of the grindstone loading oil cylinder 11 can be fully filled with oil from the liquid supplement oil circuit 7 when it needs to be refilled.

[0039] As a further option in this embodiment, a first accumulator 107 is also connected in parallel to the constant pressure control oil circuit 6. The first accumulator 107 is used for absorbing hydraulic shock during grinding operations. A third high-pressure ball valve 106 is also installed at the inlet end of the first accumulator 107, and the third high-pressure ball valve 106 is used to cut off the oil circuit when the first accumulator 107 needs to be filled with nitrogen or maintained.

[0040] As a further option in this embodiment, a first electromagnetic ball valve 1010 is installed between the rodless cavity oil port of the grindstone loading oil cylinder 11 and the inlet end of the constant pressure control oil circuit 6. A second one-way throttle valve 1011 and a third electromagnetic ball valve 1012 are also installed between the outlet end of the constant pressure control oil circuit 6 and the rod cavity oil port of the grindstone loading oil cylinder 11. The first electromagnetic ball valve 1010, the second one-way throttle valve 1011, and the third electromagnetic ball valve 1012 are used to control the grindstone floating loading mode. In order to monitor the pressure of the rod cavity oil port of the grindstone loading oil cylinder 11, a third pressure sensor 109 is also connected in parallel between the third electromagnetic ball valve 1012 and the rod cavity oil port of the grindstone loading oil cylinder 11. The pressure of the rodless cavity of the grindstone loading oil cylinder 11 is detected by a first pressure sensor 104.

[0041] As a further option in this embodiment, there are multiple grinding stone loading cylinders 11 in this hydraulic system, and each grinding stone loading cylinder 11 is configured with a proportional valve 5, a balance valve 12, an electromagnetic ball valve 1010, a one-way throttle valve 1011, and an electromagnetic ball valve 1012. That is, each balance valve 12 is installed between the two working oil ports of the proportional valve 5 and the rodless cavity oil port and the rod cavity oil port of the grinding stone loading cylinder 11. An electromagnetic ball valve 1010 is installed between the rodless cavity oil port of each grinding stone loading cylinder 11 and the inlet end of the constant pressure control oil circuit 6. A one-way throttle valve 1011 and an electromagnetic ball valve 1012 are installed between the rod cavity oil port of each grinding stone loading cylinder 11 and the outlet end of the constant pressure control oil circuit 6.

[0042] As a further option in this embodiment, multiple of the proportional valves 5 are controlled by a CAN bus. Compared with the 0-10V voltage signal, the CAN bus control of the proportional valve 5 has the advantages of being less susceptible to interference, having fewer wiring connections, and high control accuracy.

[0043] As a further option in this embodiment, the power unit includes two oil pump motor groups 2 connected in parallel with the oil tank 1, and one-way valves 3 are installed at the oil outlets of both oil pump motor groups 2. The oil pumps in the oil pump motor groups 2 are constant pressure variable pumps. The constant pressure variable pumps maintain a constant system pressure within their variable control range and are not affected by changes in pump flow rate, enabling the oil pump motor groups 2 to supply only the necessary volume of oil for operation. This not only better matches this hydraulic system but also reduces heat generation in the hydraulic system, improves system performance, and has an energy-saving effect. The one-way valve 3 at the oil outlet of the oil pump motor group 2 is used to ensure that the hydraulic oil in the hydraulic system cannot flow back into the oil pumps in the oil pump motor group 2, ensuring the safe use of the oil pumps. This hydraulic system is set to be one in operation and one in standby with interlock control to ensure the continuity of operation, ensure that it will not break down due to the failure of one, and ensure the normal grinding operation of this hydraulic system.

[0044] In addition, the oil tank 1 in this hydraulic system is an open-type oil tank 1, which is responsible for storing, dissipating heat, filtering, etc. of the hydraulic transmission medium, hydraulic oil.

[0045] The working principle of the grinding stone lifting and lowering in this hydraulic system is as follows: When the grinding stone needs to be lifted / lowered, the oil pump motor in one of the oil pump motor groups 2 starts to supply oil and build pressure. The controller sends a CAN data signal to the proportional valve 5, and the proportional valve 5 switches to the working position. The working oil enters the working chamber of the grinding stone loading cylinder 11, and the grinding stone loading cylinder 11 extends / contracts, thereby realizing the control of the grinding stone lifting / lowering. During this process, the electromagnetic ball valve 1010, the electromagnetic ball valve 1012, the electromagnetic ball valve 901, and the electromagnetic ball valve 102 are all de-energized and normally closed, and the three-way proportional pressure reducing valve 108 is de-energized and does not participate in the work.

[0046] The working principle of the grinding stone pressurization and constant pressure control in this hydraulic system is as follows:

[0047] During the rail grinding operation, when the grinding stone descends and contacts the rail, this hydraulic system switches to the floating loading state, and the pressure-holding accumulator control unit supplies oil to the rodless cavity of the grinding stone loading cylinder 11 to maintain a constant pressure state. That is: at this time, the second electromagnetic ball valve 102 is de-energized and normally closed, the first electromagnetic ball valve 1010 and the third electromagnetic ball valve 1012 are energized and switched to the working position, and the grinding stone loading cylinder 11 is in a floating state; at the same time, the fourth electromagnetic ball valve 901 is energized and switched to the working position, the oil in the second accumulator 903 is released and communicated with the rodless cavity of the grinding stone loading cylinder 11 for pressurization, and the three-way proportional pressure reducing valve 108 maintains the constant control of the pressure. The oil flows from the inlet of the three-way proportional pressure reducing valve 108 to the outlet of the three-way proportional pressure reducing valve 108 and then to the rodless cavity of each grinding stone loading cylinder 11 to keep the pressure constant.

[0048] During the grinding operation, when the second pressure sensor 904 detects that the set minimum working pressure value of the second accumulator 903 is lower than the set value, one of the oil pump motor groups 2 starts. The oil pump in the oil pump motor group 2 fills and supplements the pressure of the second accumulator 903 and at the same time supplies oil to the rodless cavity of each grinding stone loading cylinder 11. When the pressure value rises to the set maximum working pressure value of the second accumulator 903, this oil pump motor group 2 unloads and standby. At this time, only the second accumulator 903 provides the oil source for the grinding stone pressurization.

[0049] During the grinding operation, due to the rail corrugation, the grinding stone continuously floats up and down. As a result, the volume and pressure difference between the rod cavity and the rodless cavity of the grinding stone loading cylinder 11 fluctuate. Its fluctuation mode moves up and down following the fluctuation mode of the rail corrugation, and its up and down movement trajectory can be approximately regarded as a simple harmonic vibration. Therefore, the rail grinding process is a process of continuously filling and discharging the loading cavity (rodless cavity) of the grinding stone loading cylinder 11 with liquid.

[0050] When liquid filling is required, the inlet and outlet of the three-way proportional pressure reducing valve 108 are connected, and the oil return port of the three-way proportional pressure reducing valve 108 is closed. At this time, the pressure-holding accumulator control unit supplies oil to the three-way proportional pressure reducing valve 108 to provide pressure oil for the loading cavity (rodless cavity) of each grinding stone loading cylinder 11 and ensure the pressure is constant; during liquid filling, the piston rod of the grinding stone loading cylinder 11 extends, and the oil in the rod cavity of the grinding stone loading cylinder 11 is discharged back to the oil tank 1. The existence of the second one-way throttle valve 1011 ensures the smooth extension of the piston rod of the grinding stone loading cylinder 11.

[0051] When fluid discharge is required, the oil inlet of the three-way proportional pressure reducing valve 108 is closed, the oil outlet and the oil return port of the three-way proportional pressure reducing valve 108 are connected, and the three-way proportional pressure reducing valve 108 overflows the excess oil in the loading chamber (rodless chamber) of each grinding stone loading cylinder 11 while ensuring the constant pressure in the loading chamber (rodless chamber) of each grinding stone loading cylinder 11. At the same time, the accumulator 107 absorbs the abnormal hydraulic impact high-pressure oil generated during fluid discharge; during fluid discharge, the piston rod of the grinding stone loading cylinder 11 retracts, and the rod chamber of the grinding stone loading cylinder 11 is filled with oil through the oil replenishing circuit, thereby preventing the grinding stone loading cylinder 11 from sucking air and cavitating; the check valve III 13 ensures that the oil cylinder can be filled with oil normally from the pipeline during oil replenishment.

[0052] When under different road conditions, by setting the three-way proportional pressure reducing valve 108, different pressure outputs can be achieved, and the output pressure is ensured to be constant, realizing the one-to-one correspondence between the grinding force and different road conditions, and ensuring the best grinding effect.

[0053] During the grinding operation, the pressure sensor I 104 detects the working pressure of the rodless chamber of each grinding stone loading cylinder 11 in real time, and the pressure sensor III 109 detects the working pressure of the rod chamber of each grinding stone loading cylinder 11 in real time for calculating the actual grinding stone loading force; the relief valve I 105 is used as a safety valve to prevent excessive abnormal pressure during the grinding operation and provide redundant safety protection.

[0054] After the grinding is completed, the electromagnetic ball valve II 102 is first energized to release the pressure in the loading chamber of the grinding stone loading cylinder 11; the program control switches to lift the grinding stone, and the grinding stone loading cylinder 11 retracts; the one-way throttle valve I 101 ensures the smooth pressure relief of the loading chamber of the grinding stone loading cylinder 11 and suppresses the hydraulic impact; the high-pressure ball valve I 103 is used for manual unloading of the grinding stone loading cylinder 11 during fault repair.

[0055] In the description of this specification, the description with reference to terms such as "an embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0056] In addition, the terms "one" and "two" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "one" or "two" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] Those skilled in the art should understand that the above-described embodiments are merely for clearly illustrating the present utility model and are not intended to limit the scope of the present utility model. For those skilled in the art, other changes or modifications can be made based on the above disclosure, and these changes or modifications are still within the scope of the present utility model.

Claims

1. An intelligent and fast rail grinding vehicle grinding stone constant pressure loading hydraulic system, characterized in that, It includes a power unit, a proportional valve (5), a grindstone loading oil cylinder (11), and a grindstone floating pressurization constant pressure control unit (10). The pressure oil port of the proportional valve (5) is connected to the power unit, the oil return port of the proportional valve (5) is connected to the oil tank (1), and a balance valve (12) is provided between the two working oil ports of the proportional valve (5), the rodless cavity oil port of the grindstone loading oil cylinder (11), and the rod cavity oil port of the grindstone loading oil cylinder (11); the grindstone floating pressurization constant pressure control unit (10) includes a constant pressure control oil circuit (6) connected between the rodless cavity oil port and the rod cavity oil port of the grindstone loading oil cylinder (11). An electromagnetic ball valve two (102) and a one-way throttle valve one (101) are installed in sequence from the inlet end to the outlet end of the constant pressure control oil circuit (6). A three-way proportional pressure reducing valve (108) and a relief valve one (105) are also connected in parallel to the inlet end of the electromagnetic ball valve two (102). The oil return port of the three-way proportional pressure reducing valve (108) is communicated with the oil return port of the relief valve one (105), and the oil return port of the relief valve one (105) is connected to the oil tank (1); the grindstone floating pressurization constant pressure control unit (10) also includes a liquid supplement oil circuit (7) connected between the power unit and the constant pressure control oil circuit (6), and the three-way proportional pressure reducing valve (108) is installed on the liquid supplement oil circuit (7).

2. The intelligent rapid rail grinding vehicle grindstone constant pressure loading hydraulic system according to claim 1, characterized in that, It further includes a pressure maintaining energy storage control unit (9). The pressure maintaining energy storage control unit (9) includes an accumulator two (903). The accumulator two (903) is connected to the liquid supplement oil circuit (7) through a pressure maintaining oil circuit (906), and an electromagnetic ball valve four (901) is also installed on the pressure maintaining oil circuit (906).

3. The intelligent rapid rail grinding vehicle grinding stone constant pressure loading hydraulic system according to claim 2, wherein, A relief valve two (902) and a high-pressure ball valve two (905) are also connected in parallel to the pressure maintaining oil circuit (906), and the oil return port of the relief valve two (902) and the outlet end of the high-pressure ball valve two (905) are both connected to the oil tank (1).

4. The intelligent rapid rail grinding vehicle grindstone constant pressure loading hydraulic system according to claim 2, wherein, A one-way valve two (4) is also installed at the inlet end of the liquid supplement oil circuit (7).

5. The intelligent rapid rail grinding vehicle grinding stone constant pressure loading hydraulic system according to claim 1, characterized in that, The grindstone floating pressurization constant pressure control unit (10) also includes an unloading oil circuit (8). The two ends of the unloading oil circuit (8) are respectively connected in parallel between the inlet end of the electromagnetic ball valve two (102) and the outlet end of the one-way throttle valve one (101). A high-pressure ball valve one (103) is installed on the unloading oil circuit (8), and the unloading oil circuit (8) is connected to the oil tank (1). A one-way valve three (13) is also connected between the unloading oil circuit (8) and the oil tank (1).

6. The intelligent rapid rail grinding vehicle grinding stone constant pressure loading hydraulic system according to claim 1 or 2 or 5, characterized in that, An accumulator one (107) is also connected in parallel to the constant pressure control oil circuit (6).

7. The intelligent rapid rail grinding vehicle grinding stone constant pressure loading hydraulic system according to claim 1 or 2 or 5, characterized in that, An electromagnetic ball valve one (1010) is installed between the rodless cavity oil port of the grindstone loading oil cylinder (11) and the inlet end of the constant pressure control oil circuit (6). A one-way throttle valve two (1011) and an electromagnetic ball valve three (1012) are also installed between the outlet end of the constant pressure control oil circuit (6) and the rod cavity oil port of the grindstone loading oil cylinder (11).

8. The intelligent rapid rail grinding vehicle grindstone constant pressure loading hydraulic system according to claim 7, characterized in that, The grinding stone loading oil cylinders (11) and the proportional valves (5) are both multiple, and the multiple grinding stone loading oil cylinders (11) correspond to the multiple proportional valves (5) one by one. An electromagnetic ball valve I (1010) is installed between the oil port of the rodless cavity of each grinding stone loading oil cylinder (11) and the inlet end of the constant pressure control oil circuit (6). A one-way throttle valve II (1011) and an electromagnetic ball valve III (1012) are installed between the oil port of the rod cavity of each grinding stone loading oil cylinder (11) and the outlet end of the constant pressure control oil circuit (6).

9. The intelligent rapid rail grinding vehicle grindstone constant pressure loading hydraulic system according to claim 8, characterized in that, The multiple proportional valves (5) are controlled by a CAN bus.

10. The intelligent rapid rail grinding vehicle grindstone constant pressure loading hydraulic system according to claim 1 or 2 or 5, characterized in that, The power unit includes two oil pump motor sets (2) connected in parallel with the fuel tank (1), and one-way valves I (3) are installed at the oil outlets of the two oil pump motor sets (2).

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