Hydraulic adjusting system and method for height of railway vehicle floor

Abstract

A railway vehicle floor height hydraulic adjusting system is installed on a bogie. The hydraulic system is characterized by comprising a plurality of hydraulic cylinders connected with a lifting platform of a compartment floor, a two-way hydraulic control valve group communicated with rodless cavities II and rod cavities I of the hydraulic cylinders respectively, a three-position four-way electromagnetic directional valve communicated with the two-way hydraulic control valve group, and a hydraulic pump communicated with the three-position four-way electromagnetic directional valve, the motor drives the hydraulic pump to operate, the oil cavity is respectively communicated with the hydraulic pump and the three-position four-way electromagnetic directional valve, the three-position four-way electromagnetic directional valve and the motor are respectively controlled by signals of the controller, and the hydraulic cylinder is locked along with power loss of the three-position four-way electromagnetic directional valve and the motor and extends or shortens along with power gaining of the three-position four-way electromagnetic directional valve and the motor. The carrying capacity of the carriage is effectively improved, the hydraulic oil circuit structure is simpler, the manufacturing and maintenance cost is lower, and the height adjustment accuracy of the carriage floor is higher. The invention further provides a hydraulic adjusting method for the height of the railway vehicle floor.

Description

Technical Field

[0001] The invention relates to a rail vehicle floor height hydraulic adjustment system and method, belonging to the technical field of rail vehicle floor height adjustment. Background Art

[0002] For rail vehicles such as passenger trains and subways, when the load increases when passengers get on board, the car floor will sink to a height below the standard. When the load decreases when passengers get off, the car floor will rise to a height above the standard. This requires a system to adjust the height to ensure that the car floor is always at the standard height, to ensure the safety and convenience of passengers getting on and off the vehicle, and to ensure driving safety. In the prior art, rail vehicles mainly adjust the height of the car floor by inflating and deflating the rubber airbag of the air spring. Since the air spring is equipped with a height control valve, the air spring height can be automatically adjusted to keep the floor height unchanged with changes in the vehicle load, thereby ensuring the stability of the vehicle's driving. However, there are the following problems in adjusting the height of the car floor by air springs: 1. The filling and unloading of the rubber airbag of the air spring requires a special air source and air pipeline, which has many disadvantages such as high manufacturing and maintenance costs of the air source and air pipeline, relatively heavy weight, and complex air pipeline layout.

[0003] 2. Generally, a carriage is equipped with two or four air springs. Due to the influence of factors such as vehicle layout and passenger distribution, the air springs in the passenger concentration area have a large load capacity and a large compression, while the air springs in the passenger vacancy area have a small load capacity and a small compression, resulting in different compression amounts of each air spring. It is difficult to level the carriage floor, which is time-consuming and laborious. Even after leveling, the car body has a large deflection, and the height adjustment accuracy is difficult to grasp, affecting the accuracy of the carriage floor height adjustment.

[0004] The existing patent documents retrieved are: 1.CN202323453612.X-An electric sightseeing car with adjustable floor height; 2. CN202010836295.1-A magnetic levitation air suspension height adjustment system and adjustment method; 3. CN201921101399.7-An air spring and rail vehicle capable of achieving horizontal limit in a narrow space; 4. CN201810997947.2-Method and system for controlling the lifting and lowering of rail vehicles; 5.CN201410008904.9-Air spring suspension mechanism for low-floor rail vehicle bogie. Summary of the invention

[0005] The rail vehicle floor height hydraulic adjustment system provided by the present invention has high load-bearing reliability, multiple hydraulic cylinders can form synchronous adjustment, high load-bearing stability for the carriage floor, and reliable support for the carriage floor. The inclination and floating of the carriage floor during the load-bearing process can be effectively controlled, and the carrying capacity and carrying stability of the carriage can be improved. The carriage floor height adjustment accuracy is higher, the hydraulic oil circuit structure is simpler, the weight is lighter, and the manufacturing and maintenance costs are lower, so that the carriage floor maintains a normal height during the carriage load process, ensuring the stability of vehicle driving. The present invention also provides a rail vehicle floor height hydraulic adjustment method.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: The rail vehicle floor height hydraulic adjustment system is installed on the bogie, and is characterized in that it includes: a plurality of hydraulic cylinders connected to the lifting platform of the carriage floor, a two-way hydraulic control valve group respectively connected to the rodless chamber II and the rod chamber I of the hydraulic cylinder, a three-position four-way electromagnetic reversing valve connected to the two-way hydraulic control valve group, a hydraulic pump connected to the three-position four-way electromagnetic reversing valve, a motor driving the hydraulic pump to operate, and an oil chamber respectively connected to the hydraulic pump and the three-position four-way electromagnetic reversing valve, the three-position four-way electromagnetic reversing valve and the motor are respectively controlled by controller signals, the hydraulic cylinder is locked when the three-position four-way electromagnetic reversing valve and the motor lose power, and is extended or shortened when the three-position four-way electromagnetic reversing valve and the motor are energized.

[0007] Preferably, the bidirectional hydraulic control valve group includes a balancing valve 1 connected to the rodless chamber II of the hydraulic cylinder, a balancing valve 2 connected to the rod chamber I of the hydraulic cylinder, and the balancing valve 1 and the balancing valve 2 are respectively connected to the three-position four-way electromagnetic reversing valve.

[0008] Preferably, it also includes a relief valve connected to the three-position four-way electromagnetic reversing valve, the oil inlet end of the relief valve is connected to the three-position four-way electromagnetic reversing valve, and the oil outlet end is connected to the oil chamber.

[0009] Preferably, it also includes a valve block installed on the bogie and having an oil circuit inside. The hydraulic cylinder, two-way control valve group, three-position four-way solenoid reversing valve, hydraulic pump, motor, oil chamber and overflow valve are all integrated on the valve block and connected through the oil circuit in the valve block.

[0010] Preferably, a hydraulic chamber is formed on the valve block to form an inner cavity of the hydraulic cylinder. The hydraulic cylinder includes a piston rod whose inner end extends into the hydraulic chamber, a piston fixed at the lower end of the piston rod and sealingly cooperates with the cavity wall of the hydraulic chamber, and a guide seat that seals the opening of the hydraulic chamber and guides the piston rod. The piston divides the hydraulic chamber into a rod chamber I and a rodless chamber II located below the rod chamber I. An oil outlet A1 connected to a balancing valve 2 is formed on the rod chamber I, and an oil outlet B1 connected to a balancing valve 1 is formed on the rodless chamber II. The upper end of the piston rod is connected to the lifting platform of the car floor.

[0011] Preferably, an oil-free sliding bearing is pressed onto the valve block, and a guide column parallel to the piston rod extends into the oil-free sliding bearing, the upper end of the guide column is connected to the lifting platform of the carriage floor, and the guide column moves in the oil-free sliding bearing as the piston rod moves.

[0012] Preferably, a pull-rope displacement sensor connected to the controller is installed on the valve block, and the pull-rope end of the pull-rope displacement sensor is fixed to the lifting platform of the carriage floor.

[0013] The method for hydraulically adjusting the floor height of a rail vehicle adopts the above-mentioned hydraulic adjusting system for adjusting the floor height of a rail vehicle, and is characterized in that: the rod chamber I and the rodless chamber II of the hydraulic cylinder are both filled with oil, and the normal height range of the lifting platform of the carriage floor is set in the controller according to the standard height of the carriage floor; Carriage floor height locking: When the height of the lifting platform of the carriage floor is within the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to lose power, the three-position four-way solenoid reversing valve is disconnected, and the hydraulic cylinder is locked; Carriage floor height adjustment: When the height of the car floor lifting platform is not within the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to be energized, the three-position four-way solenoid reversing valve switches to open, the motor drives the hydraulic pump to run, and the hydraulic cylinder extends or shortens to adjust the height of the car floor lifting platform. When the height of the car floor lifting platform is adjusted to the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to de-energize, and re-lock the hydraulic cylinder.

[0014] Preferably, the specific process of adjusting the height of the carriage floor is as follows: When the height of the lifting platform of the carriage floor is lower than the lower limit of the normal height range, the controller controls the three-position four-way electromagnetic reversing valve and the motor to be energized, the three-position four-way electromagnetic reversing valve is switched to the left position to open, the motor drives the hydraulic pump to operate, and the pumped oil of the hydraulic pump enters the rodless chamber I of the hydraulic cylinder through the three-way electromagnetic reversing valve and the balance valve 1, pushing the hydraulic cylinder to extend, and the oil in the rod chamber II of the hydraulic cylinder is squeezed out as the hydraulic cylinder extends and flows into the oil chamber through the balance valve 2 and the three-position four-way electromagnetic reversing valve, and the lifting platform of the carriage floor is lifted as the hydraulic cylinder extends. When the height of the lifting platform of the carriage floor is lifted to within the normal height range, the controller controls the three-position four-way electromagnetic reversing valve and the motor to lose power, and re-lock the hydraulic cylinder; When the height of the lifting platform of the car floor is greater than the upper limit of the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to be energized, the three-position four-way solenoid reversing valve switches to the right position to open, and the motor drives the hydraulic pump to run. The pumping oil of the hydraulic pump enters the rod chamber Ⅱ of the hydraulic cylinder through the three-way solenoid reversing valve and the balance valve 2, pushing the hydraulic cylinder to shorten. The oil in the rodless chamber Ⅰ of the hydraulic cylinder is squeezed out as the hydraulic cylinder shortens and flows into the oil chamber through the balance valve 1 and the three-position four-way solenoid reversing valve. The lifting platform of the car floor descends as the hydraulic cylinder shortens. When the height of the lifting platform of the car floor drops to within the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to lose power and re-lock the hydraulic cylinder.

[0015] Preferably, the controller monitors the height of the lifting platform of the carriage floor in real time through the sensing signal of the pull rope sensor, and controls the three-position four-way electromagnetic reversing valve and the motor according to the real-time monitoring information.

[0016] The beneficial effects of the invention are: In the rail vehicle floor height hydraulic adjustment system of the present invention, the two-way hydraulic control valve group is respectively connected to the rodless chamber II and the rod chamber I of the hydraulic cylinder, the hydraulic pump is connected to the three-position four-way electromagnetic reversing valve, the three-position four-way electromagnetic reversing valve is connected to the two-way hydraulic control valve group, the three-position four-way electromagnetic reversing valve is in a disconnected state when the power is off, the hydraulic cylinder is locked by the two-way hydraulic control valve group and cannot be extended or retracted, and the car floor maintains a normal height. When the car load changes and the car floor height needs to be adjusted, the controller controls the three-position four-way electromagnetic reversing valve and the motor to be energized, the three-position four-way electromagnetic reversing valve is switched to open, and the motor drives the hydraulic pump to operate. If the car floor height needs to be raised, the pumping oil of the hydraulic pump flows to the rodless chamber II of the hydraulic cylinder through the three-position four-way electromagnetic reversing valve and the two-way hydraulic control valve group, so that the hydraulic cylinder is extended, and the oil in the rod chamber I of the hydraulic cylinder is squeezed out as the hydraulic cylinder is extended and flows into the oil chamber through the two-way hydraulic control valve group and the three-position four-way electromagnetic reversing valve. If the car floor height needs to be lowered, the pumping oil of the hydraulic pump passes through the three-position four-way electromagnetic reversing valve. The oil in the rodless chamber Ⅱ of the hydraulic cylinder is squeezed out as the hydraulic cylinder is shortened, and flows into the oil chamber through the two-way hydraulic control valve group and the three-position four-way electromagnetic reversing valve. When the height of the car floor is adjusted to a normal height, the controller controls the three-position four-way electromagnetic reversing valve and the motor to lose power, and the hydraulic cylinder is locked again, so that the height of the car floor remains unchanged. Compared with the height adjustment structure of the prior art that connects the air pipeline and the air source through an air spring, the hydraulic adjustment system has high load-bearing reliability, multiple hydraulic cylinders can form synchronous adjustment, high load-bearing stability for the car floor, and reliable support for the car floor can be formed, which can effectively control the inclination and floating of the car floor during the load-bearing process, improve the carrying capacity and carrying stability of the car, and the car floor height adjustment has higher accuracy, simpler hydraulic oil circuit structure, lighter weight, lower manufacturing and maintenance costs, so that the car floor maintains a normal height during the car load process, and ensures the stability of vehicle driving.

[0017] The rail vehicle height hydraulic adjustment system is integrated on the valve block, and the valve block is installed on the bogie, eliminating the need to separately arrange and install various components and oil circuits in the system on the bogie, forming an integrated system structure integrated on the valve block, with high integration, small space occupancy, easy layout and convenient maintenance. The oil circuit required by the system is opened on the valve block, avoiding the use of oil pipes for oil circuit connection, simplifying the oil circuit structure, reducing the weight of the system, meeting the needs of lightweight design of rail vehicles, and improving the vehicle carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a principle structural diagram of the rail vehicle floor height hydraulic adjustment system of the present invention when the hydraulic cylinder is locked.

[0019] Figure 2 This is the principle structure diagram of the rail vehicle floor height hydraulic adjustment system when the hydraulic cylinder is extended.

[0020] Figure 3 This is the principle structural diagram of the rail vehicle floor height hydraulic adjustment system when the hydraulic cylinder is shortened.

[0021] Figure 4 It is a structural schematic diagram of the connection between the rail vehicle floor height hydraulic adjustment system of the present invention and the lifting platform of the carriage floor.

[0022] Figure 5 Cross-sectional view of the hydraulic cylinder and guide column integrated into the valve block. DETAILED DESCRIPTION

[0023] Combine the following Figures 1 to 5 The embodiments of the present invention are described in detail.

[0024] The rail vehicle floor height hydraulic adjustment system is installed on a bogie and is characterized in that it includes a plurality of hydraulic cylinders 1 connected to a lifting platform 100 of a carriage floor, a two-way hydraulic control valve group 2 respectively connected to a rodless chamber II and a rod chamber I of the hydraulic cylinder 1, a three-position four-way electromagnetic reversing valve 3 connected to the two-way hydraulic control valve group 2, a hydraulic pump 4 connected to the three-position four-way electromagnetic reversing valve 3, a motor 5 for driving the hydraulic pump 4 to operate, and an oil chamber 6 respectively connected to the hydraulic pump 4 and the three-position four-way electromagnetic reversing valve 3, the three-position four-way electromagnetic reversing valve 3 and the motor 5 are respectively controlled by controller signals, the hydraulic cylinder 1 is locked when the three-position four-way electromagnetic reversing valve 3 and the motor 5 lose power, and is extended or shortened when the three-position four-way electromagnetic reversing valve 3 and the motor 4 are energized.

[0025] In the above-mentioned rail vehicle floor height hydraulic adjustment system, the two-way hydraulic control valve group 2 is connected to the rodless chamber II and the rod chamber I of the hydraulic cylinder 1 respectively, the hydraulic pump 4 is connected to the three-position four-way electromagnetic reversing valve 3, and the three-position four-way electromagnetic reversing valve 3 is connected to the two-way hydraulic control valve group 2. When the three-position four-way electromagnetic reversing valve 3 loses power, it is in a disconnected state, and the hydraulic cylinder 4 is locked by the two-way hydraulic control valve group 2 and cannot be extended or retracted. The car floor maintains a normal height. When the car load changes and the car floor height needs to be adjusted, the controller controls the three-position four-way electromagnetic reversing valve 3 to adjust the height of the car floor. The magnetic reversing valve 3 and the motor 5 are energized, the three-position four-way electromagnetic reversing valve 3 is switched to open, and the motor 5 drives the hydraulic pump 4 to operate. If the height of the car floor needs to be raised, the pumped oil of the hydraulic pump 4 flows to the rodless chamber Ⅱ of the hydraulic cylinder 1 through the three-position four-way electromagnetic reversing valve 3 and the two-way hydraulic control valve group 2, so that the hydraulic cylinder 1 extends. The oil in the rod chamber Ⅰ of the hydraulic cylinder is squeezed out as the hydraulic cylinder extends, and flows to the oil chamber 6 through the two-way hydraulic control valve group 2 and the three-position four-way electromagnetic reversing valve 3. If the height of the car floor needs to be lowered, the pumped oil of the hydraulic pump 4 flows to the rodless chamber Ⅱ of the hydraulic cylinder 1 through the three-position four-way electromagnetic reversing valve 3 and the two-way hydraulic control valve group 2. The oil in the rodless chamber II of the hydraulic cylinder is squeezed out as the hydraulic cylinder 1 is shortened, and flows into the oil chamber 6 through the two-way hydraulic control valve group 2 and the three-position four-way electromagnetic reversing valve 3. When the height of the car floor is adjusted to a normal height, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to lose power, and the hydraulic cylinder 1 is locked again, so that the height of the car floor remains unchanged. Compared with the height adjustment structure of the prior art that connects the air pipeline and the air source through an air spring, the hydraulic adjustment system has high load-bearing reliability, multiple hydraulic cylinders can form synchronous adjustment, high load-bearing stability for the car floor, and reliable support for the car floor can be formed, which can effectively control the inclination and floating of the car floor during the load-bearing process, improve the carrying capacity and carrying stability of the car, and the car floor height adjustment has higher accuracy, simpler hydraulic oil circuit structure, lighter weight, lower manufacturing and maintenance costs, so that the car floor maintains a normal height during the car load process, and ensures the stability of vehicle driving.

[0026] The two-way hydraulic control valve group 2 includes a balancing valve 1 21 connected to the rodless chamber II of the hydraulic cylinder 1, a balancing valve 2 22 connected to the rod chamber I of the hydraulic cylinder 1, and the balancing valve 1 21 and the balancing valve 2 22 are respectively connected to the three-position four-way electromagnetic reversing valve 3. When the hydraulic cylinder 1 needs to be extended, the three-position four-way electromagnetic reversing valve 3 is switched to the left position to open, and the oil pumped by the hydraulic pump 4 flows to the balancing valve 1 21 through the three-position four-way electromagnetic reversing valve 3, and flows from the balancing valve 1 21 to the rodless chamber II of the hydraulic cylinder. The extension of the hydraulic cylinder 1 causes the volume of the rod chamber I to decrease, so that the oil in the rod chamber I is squeezed out and flows to the oil chamber 6 through the balancing valve 2 22 and the three-position four-way electromagnetic reversing valve 3; when the hydraulic cylinder 1 needs to be shortened, the three-position four-way electromagnetic reversing valve 3 is switched to the right position to open, and the oil pumped by the hydraulic pump 4 flows through the three-position four-way electromagnetic reversing valve 3 It flows to the balancing valve 22, and then flows from the balancing valve 22 to the rod chamber Ⅰ of the hydraulic cylinder. The shortening of the hydraulic cylinder 1 causes the volume of the rodless chamber Ⅱ to decrease, so that the oil in the rodless chamber Ⅱ is squeezed out and flows into the oil chamber 6 through the balancing valve 1 21 and the three-position four-way electromagnetic reversing valve 3. During the extension and retraction process of the hydraulic cylinder 1, the balancing valve 1 21 and the balancing valve 2 22 are both liquid control one-way valves. The two balancing valves realize two-way liquid control of the rod chamber and the rodless chamber of the hydraulic cylinder 1, so that multiple hydraulic cylinders 1 can be extended and retracted synchronously and at a steady speed during the extension and retraction process, thereby ensuring the reliability of height adjustment.

[0027] The overflow valve 7 is also included, which is connected to the three-position four-way electromagnetic reversing valve 3. The oil inlet of the overflow valve 7 is connected to the three-position four-way electromagnetic reversing valve 3, and the oil outlet is connected to the oil chamber 6. When the rail vehicle height hydraulic adjustment system is overloaded, the overflow valve 7 can unload in time, play an overload protection role, and improve the safety and reliability of the entire system structure.

[0028] It also includes a valve block 8 mounted on the bogie and having an oil circuit inside. The hydraulic cylinder 1, two-way control valve group 2, three-position four-way electromagnetic reversing valve 3, hydraulic pump 4, motor 5, oil chamber 6 and overflow valve 7 are all integrated on the valve block 8 and connected through the oil circuit in the valve block 8. That is, the rail vehicle height hydraulic adjustment system is integrated on the valve block 8, and the valve block 8 is mounted on the bogie, eliminating the need to arrange and install the components and oil circuits in the system on the bogie separately, forming an integrated system structure integrated on the valve block, with high integration, small space occupancy, easy layout and convenient maintenance. The oil circuit required by the system is opened on the valve block 8, avoiding the use of oil pipes for oil circuit connection, simplifying the oil circuit structure, reducing the weight of the system, meeting the needs of lightweight design of rail vehicles, and improving the vehicle carrying capacity.

[0029] Among them, the valve block 8 is provided with a hydraulic chamber 9 which forms the inner cavity of the hydraulic cylinder 1. The hydraulic cylinder 1 includes a piston rod 10 whose inner end extends into the hydraulic chamber 9, a piston 11 which is fixed at the lower end of the piston rod 10 and seals with the cavity wall of the hydraulic chamber 9, and a guide seat 12 which seals the opening of the hydraulic chamber 9 and guides the piston rod 10. The piston 11 divides the hydraulic chamber 9 into a rod chamber I and a rodless chamber II located below the rod chamber I. The rod chamber I is provided with an oil outlet A1 which is connected to the balancing valve 22, and the rodless chamber II is provided with an oil outlet B1 which is connected to the balancing valve 1 21. The upper end of the piston rod 10 is connected to the lifting platform 100 of the car floor. The hydraulic chamber 9, as the inner chamber of the hydraulic cylinder 1, is directly opened on the valve block 8. The piston rod 10 is fixed to the piston 11 and extends into the hydraulic chamber 9 to form a rod chamber and a rodless chamber. An oil outlet A1 connected to the balancing valve 22 is opened on the rod chamber, and an oil outlet B1 connected to the balancing valve 1 21 is opened on the rodless chamber. The inner chamber of the hydraulic cylinder 9 is opened on the valve block 8 and is connected to the balancing valve 1 21 and the balancing valve 2 22 through the oil circuit on the valve block 8. The hydraulic cylinder 1 and the oil circuit are integrated on the valve block 8, with a small space occupancy, easy layout, a simpler oil circuit structure and a high degree of integration.

[0030] The oil-free sliding bearing 13 is press-fitted on the valve block 8, and the guide column 14 parallel to the piston rod 10 extends into the oil-free sliding bearing 13 in a guiding manner. The upper end of the guide column 14 is connected to the lifting platform 100 of the carriage floor, and the guide column 14 moves in the oil-free sliding bearing 13 with the movement of the piston rod 10. The guide column 14 increases the anti-lateral force of the entire adjustment system, which can effectively prevent the lateral tilt of the adjustment system during the extension and retraction of the hydraulic cylinder 1, so that the carriage floor remains horizontal and does not tilt, and improves the structural reliability of the adjustment system.

[0031] The valve block 8 is provided with a pull-rope displacement sensor 15 connected to the controller, and the pull-rope end of the pull-rope displacement sensor 15 is fixed to the lifting platform 100 of the carriage floor. The pull-rope displacement sensor 15 monitors the height of the lowering platform 100 of the carriage floor in real time, and transmits the monitoring information to the controller. The controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to be energized or de-energized according to the received monitoring information, so as to realize automatic adjustment of the height of the carriage floor.

[0032] The present invention also provides a method for hydraulically adjusting the floor height of a rail vehicle, which is adjusted by using the above-mentioned hydraulic adjustment system for the floor height of a rail vehicle, and is characterized in that: the rod chamber I and the rodless chamber II of the hydraulic cylinder 1 are both filled with oil, and the normal height range of the lifting platform 100 of the carriage floor is set in the controller according to the standard height of the carriage floor; Carriage floor height locking: When the height of the lifting platform 100 of the carriage floor is within the normal height range, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor to lose power, the three-position four-way electromagnetic reversing valve is disconnected, and the hydraulic cylinder is locked; Carriage floor height adjustment: When the height of the lifting platform of the car floor is not within the normal height range, the controller controls the three-position four-way solenoid reversing valve and motor 5 to be energized, the three-position four-way solenoid reversing valve 3 is switched to open, and the motor 5 drives the hydraulic pump 4 to run, and the hydraulic cylinder is extended or shortened to adjust the height of the lifting platform 100 of the car floor. When the height of the lifting platform 100 of the car floor is adjusted to the normal height range, the controller controls the three-position four-way solenoid reversing valve 3 and motor 4 to lose power and re-lock the hydraulic cylinder.

[0033] In the above-mentioned method for hydraulically adjusting the floor height of a rail vehicle, the three-position four-way solenoid reversing valve 3 is in a disconnected state when it loses power, and the hydraulic cylinder 4 is locked by the two-way hydraulic control valve group 2 and cannot be extended or retracted, and the car floor maintains a normal height. When the car load changes and the car floor height needs to be adjusted, the controller controls the three-position four-way solenoid reversing valve 3 and the motor 5 to be energized, and the three-position four-way solenoid reversing valve 3 is switched on, and the motor 5 drives the hydraulic pump 4 to operate. If the car floor height needs to be raised, the pumped oil of the hydraulic pump 4 flows through the three-position four-way solenoid reversing valve 3 and the two-way hydraulic control valve group 2 to the rodless chamber II of the hydraulic cylinder 1, so that the hydraulic cylinder 1 is extended, and the oil in the rod chamber I of the hydraulic cylinder is moved along with the liquid The extension of the pressure cylinder is squeezed out and flows into the oil chamber 6 through the two-way hydraulic control valve group 2 and the three-position four-way electromagnetic reversing valve 3. If the height of the car floor needs to be lowered, the pumped oil of the hydraulic pump 4 flows into the rod chamber Ⅰ of the hydraulic cylinder through the three-position four-way electromagnetic reversing valve 3 and the two-way hydraulic control valve group 2, shortening the hydraulic cylinder. The oil in the rodless chamber Ⅱ of the hydraulic cylinder is squeezed out as the hydraulic cylinder 1 is shortened and flows into the oil chamber 6 through the two-way hydraulic control valve group 2 and the three-position four-way electromagnetic reversing valve 3. When the height of the car floor is adjusted to the normal height, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to lose power, and the hydraulic cylinder 1 is locked again, so that the height of the car floor remains unchanged, thereby realizing automatic adjustment of the height of the car floor.

[0034] Among them, the specific process of adjusting the height of the carriage floor is as follows: like Figure 2 As shown, when the height of the lifting platform 100 of the compartment floor is less than the lower limit of the normal height range, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to be energized, the three-position four-way electromagnetic reversing valve 3 is switched to the left position to open, and the motor 5 drives the hydraulic pump 4 to operate. The pumped oil of the hydraulic pump 5 enters the rodless chamber Ⅰ of the hydraulic cylinder through the three-way electromagnetic reversing valve 3 and the balance valve 1 21, pushing the hydraulic cylinder 1 to extend, and the oil in the rod chamber Ⅱ of the hydraulic cylinder 1 is squeezed out as the hydraulic cylinder extends, and flows into the oil chamber 6 through the balance valve 2 22 and the three-position four-way electromagnetic reversing valve 3, and the lifting platform 100 of the compartment floor is lifted as the hydraulic cylinder extends. When the height of the lifting platform 100 of the compartment floor is lifted to within the normal height range, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to lose power, and re-locks the hydraulic cylinder 1; like Figure 3As shown, when the height of the lifting platform of the car floor is greater than the upper limit of the normal height range, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to be energized, the three-position four-way electromagnetic reversing valve 3 is switched to the right position to open, and the motor 5 drives the hydraulic pump 4 to operate. The pumping oil of the hydraulic pump 4 enters the rod chamber Ⅱ of the hydraulic cylinder 1 through the three-way electromagnetic reversing valve 3 and the balance valve 22, pushing the hydraulic cylinder 1 to shorten, and the oil in the rodless chamber Ⅰ of the hydraulic cylinder is squeezed out as the hydraulic cylinder 1 shortens and flows into the oil chamber 6 through the balance valve 1 21 and the three-position four-way electromagnetic reversing valve 3, and the lifting platform 100 of the car floor descends as the hydraulic cylinder shortens. When the height of the lifting platform of the car floor drops to within the normal height range, the controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to lose power, and re-locks the hydraulic cylinder.

[0035] When the hydraulic cylinder 1 is extended, the three-position four-way solenoid reversing valve 3 is switched to the left position and opened, and the oil pumped by the hydraulic pump 4 flows through the three-position four-way solenoid reversing valve 3 to the balance valve 1 21, and then flows from the balance valve 1 21 to the rodless chamber Ⅱ of the hydraulic cylinder. The extension of the hydraulic cylinder 1 causes the volume of the rod chamber Ⅰ to decrease, so that the oil in the rod chamber Ⅰ is squeezed out and flows through the balance valve 2 22 and the three-position four-way solenoid reversing valve 3 to the oil chamber 6; when the hydraulic cylinder 1 is shortened, the three-position four-way solenoid reversing valve 3 is switched to the right position and opened, and the oil pumped by the hydraulic pump 4 flows through the three-position four-way solenoid reversing valve The oil flows from the directional valve 3 to the balancing valve 2 2, and from the balancing valve 2 22 to the rod chamber Ⅰ of the hydraulic cylinder. The shortening of the hydraulic cylinder 1 causes the volume of the rodless chamber Ⅱ to decrease, so that the oil in the rodless chamber Ⅱ is squeezed out and flows into the oil chamber 6 through the balancing valve 1 21 and the three-position four-way electromagnetic reversing valve 3. During the extension and retraction process of the hydraulic cylinder 1, the balancing valve 1 21 and the balancing valve 2 22 are both hydraulically controlled one-way valves. The two balancing valves realize two-way hydraulic control of the hydraulic cylinder oil, so that multiple hydraulic cylinders can be extended and retracted synchronously and at a stable speed during the extension and retraction process, thereby ensuring the reliability of height adjustment.

[0036] The controller monitors the height of the lifting platform 100 of the carriage floor in real time through the sensing signal of the pull rope sensor 15, and controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 according to the real-time monitoring information. The pull rope displacement sensor 15 monitors the height of the leveling platform 100 of the carriage floor in real time, and transmits the monitoring information to the controller. The controller controls the three-position four-way electromagnetic reversing valve 3 and the motor 5 to be energized or de-energized according to the received monitoring information, so as to realize the automatic adjustment of the height of the carriage floor.

[0037] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A hydraulic adjustment system for the floor height of a rail vehicle, mounted on a bogie, characterized in that: It includes multiple hydraulic cylinders connected to the lifting platform of the car floor, a two-way hydraulic control valve group respectively connected to the rodless chamber II and the rod chamber I of the hydraulic cylinder, a three-position four-way solenoid reversing valve connected to the two-way hydraulic control valve group, a hydraulic pump connected to the three-position four-way solenoid reversing valve, a motor driving the hydraulic pump and an oil chamber respectively connected to the hydraulic pump and the three-position four-way solenoid reversing valve. The three-position four-way solenoid reversing valve and the motor are respectively controlled by controller signals. The hydraulic cylinder is locked when the three-position four-way solenoid reversing valve and the motor lose power, and extends or shortens when the three-position four-way solenoid reversing valve and the motor are energized.

2. The rail vehicle floor height hydraulic adjustment system according to claim 1, characterized in that: The bidirectional hydraulic control valve group includes a balance valve 1 connected to the rodless chamber II of the hydraulic cylinder and a balance valve 2 connected to the rod chamber I of the hydraulic cylinder. The balance valve 1 and the balance valve 2 are respectively connected to the three-position four-way electromagnetic reversing valve.

3. The rail vehicle floor height hydraulic adjustment system according to claim 1, characterized in that: It also includes an overflow valve connected to the three-position four-way electromagnetic reversing valve. The oil inlet end of the overflow valve is connected to the three-position four-way electromagnetic reversing valve, and the oil outlet end is connected to the oil chamber.

4. The rail vehicle floor height hydraulic adjustment system according to claim 3, characterized in that: It also includes a valve block installed on the bogie and having an oil circuit inside. The hydraulic cylinder, two-way control valve group, three-position four-way electromagnetic reversing valve, hydraulic pump, motor, oil chamber and overflow valve are all integrated on the valve block and connected through the oil circuit in the valve block.

5. The rail vehicle floor height hydraulic adjustment system according to claim 4, characterized in that: A hydraulic chamber is formed on the valve block to form an inner cavity of the hydraulic cylinder. The hydraulic cylinder includes a piston rod whose inner end extends into the hydraulic chamber, a piston fixed to the lower end of the piston rod and sealingly matched with the chamber wall of the hydraulic chamber, and a guide seat that seals the opening of the hydraulic chamber and guides the piston rod. The piston divides the hydraulic chamber into a rod chamber I and a rodless chamber II located below the rod chamber I. An oil outlet A1 connected to a balancing valve 2 is formed on the rod chamber I, and an oil outlet B1 connected to a balancing valve 1 is formed on the rodless chamber II. The upper end of the piston rod is connected to the lifting platform of the car floor.

6. The rail vehicle floor height hydraulic adjustment system according to claim 5, characterized in that: The valve block is press-fitted with an oil-free sliding bearing, a guide column parallel to the piston rod extends into the oil-free sliding bearing, the upper end of the guide column is connected to the lifting platform of the carriage floor, and the guide column moves in the oil-free sliding bearing as the piston rod moves.

7. The rail vehicle floor height hydraulic adjustment system according to claim 4, characterized in that: A pull rope displacement sensor connected to the controller is installed on the valve block, and the pull rope end of the pull rope displacement sensor is fixed to the lifting platform of the carriage floor.

8. A method for hydraulically adjusting the floor height of a rail vehicle, using the hydraulic adjusting system for the floor height of a rail vehicle according to any one of claims 1 to 7 for adjustment, characterized in that: Fill the rod chamber I and rodless chamber II of the hydraulic cylinder with oil, and set the normal height range of the lifting platform of the carriage floor in the controller according to the standard height of the carriage floor; Carriage floor height locking: When the height of the lifting platform of the carriage floor is within the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to lose power, the three-position four-way solenoid reversing valve is disconnected, and the hydraulic cylinder is locked; Carriage floor height adjustment: When the height of the car floor lifting platform is not within the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to be energized, the three-position four-way solenoid reversing valve switches to open, the motor drives the hydraulic pump to run, and the hydraulic cylinder extends or shortens to adjust the height of the car floor lifting platform. When the height of the car floor lifting platform is adjusted to the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to de-energize, and re-lock the hydraulic cylinder.

9. The method for hydraulically adjusting the floor height of a rail vehicle according to claim 8, characterized in that: The specific process of adjusting the height of the carriage floor is as follows: When the height of the lifting platform of the carriage floor is lower than the lower limit of the normal height range, the controller controls the three-position four-way electromagnetic reversing valve and the motor to be energized, the three-position four-way electromagnetic reversing valve is switched to the left position to open, the motor drives the hydraulic pump to operate, and the pumped oil of the hydraulic pump enters the rodless chamber I of the hydraulic cylinder through the three-way electromagnetic reversing valve and the balance valve 1, pushing the hydraulic cylinder to extend, and the oil in the rod chamber II of the hydraulic cylinder is squeezed out as the hydraulic cylinder extends and flows into the oil chamber through the balance valve 2 and the three-position four-way electromagnetic reversing valve, and the lifting platform of the carriage floor is lifted as the hydraulic cylinder extends. When the height of the lifting platform of the carriage floor is lifted to within the normal height range, the controller controls the three-position four-way electromagnetic reversing valve and the motor to lose power, and re-lock the hydraulic cylinder; When the height of the lifting platform of the car floor is greater than the upper limit of the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to be energized, the three-position four-way solenoid reversing valve switches to the right position to open, and the motor drives the hydraulic pump to run. The pumping oil of the hydraulic pump enters the rod chamber Ⅱ of the hydraulic cylinder through the three-way solenoid reversing valve and the balance valve 2, pushing the hydraulic cylinder to shorten. The oil in the rodless chamber Ⅰ of the hydraulic cylinder is squeezed out as the hydraulic cylinder shortens and flows into the oil chamber through the balance valve 1 and the three-position four-way solenoid reversing valve. The lifting platform of the car floor descends as the hydraulic cylinder shortens. When the height of the lifting platform of the car floor drops to within the normal height range, the controller controls the three-position four-way solenoid reversing valve and the motor to lose power and re-lock the hydraulic cylinder.

10. The method for hydraulically adjusting the floor height of a rail vehicle according to claim 9, characterized in that: The controller monitors the height of the lifting platform of the car floor in real time through the sensing signal of the pull rope sensor, and controls the three-position four-way electromagnetic reversing valve and the motor according to the real-time monitoring information.

Images