A hydraulic synchronous control device for disassembling and assembling the motor vehicle bogie

Abstract

The present invention belongs to the technical field of multi-stage hydraulic cylinder synchronous lifting, and specifically relates to a hydraulic synchronous control device for disassembling and assembling a motor vehicle bogie, comprising a power source, an oil tank, a synchronous oil cylinder assembly, a feedback integrated assembly and a multi-stage hydraulic cylinder group, wherein the power source comprises a three-phase asynchronous motor, a plunger variable pump and a proportional regulating valve, and the output end of the three-phase asynchronous motor is connected to the plunger variable pump; the power source flow is regulated by a proportional valve in an open loop to ensure efficient power output, and a synchronous control scheme for a multi-stage hydraulic cylinder is provided, with a synchronization accuracy of ±0.03%, and low-cost and high-precision synchronous control can be achieved. Generally, synchronous control of 2-6 multi-stage cylinders can be achieved, and the synchronization accuracy is below 1 mm. The synchronous compensation valve is relatively small, less than 6 diameters. If higher accuracy and dynamic effect are required, a servo valve can be used to compensate for the synchronization error, and the synchronization accuracy can reach below 0.1 mm. Redundant control avoids out-of-control accidents.

Description

Technical Field

[0001] The invention belongs to the technical field of multi-stage hydraulic cylinder synchronous lifting, and in particular relates to a hydraulic synchronous control device for disassembling and assembling a motor vehicle bogie. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth, so it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The multi-stage telescopic hydraulic cylinder is composed of a two-stage or multi-stage piston cylinder set, also known as a telescopic cylinder, which is often used in small installation spaces and is suitable for occasions where a long stroke is required.

[0003] Firstly, conventional open-loop synchronization, such as the use of plunger-type shunt motors, can only achieve a synchronization accuracy of ±0.5% (at this time, the eccentric load cannot be too large, otherwise it cannot be achieved). The structure of the plunger-type shunt motor is very complex and the manufacturing cost is very high. If a gear-type shunt motor is used, its synchronization accuracy can only reach ±2%. Relatively speaking, the structure of the gear-type shunt motor is simple. If a hydraulic synchronization valve is used, its synchronization accuracy is lower than ±2%, and its anti-eccentric load capability is poor. The manufacturing difficulty of a high-precision synchronization valve is high, and only the synchronization of two hydraulic cylinders can be achieved. No matter which open-loop synchronization element is used, it cannot control the synchronous action of a multi-stage hydraulic cylinder (because the flow rate and speed are proportional when each stage of the multi-stage hydraulic cylinder is in place, the synchronization error will also be proportionally amplified). Secondly, closed-loop synchronization is generally controlled by a proportional valve, but the control difficulty is high and the manufacturing cost is also high. At the same time, due to the throttling effect of the proportional valve, a large amount of waste heat is generated, the system efficiency is low, and it is difficult to maintain. When there is a problem with the feedback model, closed-loop synchronization will have serious accident hazards and require additional redundant control. Summary of the invention

[0004] The object of the present invention is to provide a hydraulic synchronous control device for assembly and disassembly of a motor vehicle bogie, so as to solve the problems of complex structure, low precision and high control difficulty proposed in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic synchronous control device for disassembling and assembling a motor vehicle bogie, comprising a power source, an oil tank, a synchronous oil cylinder assembly, a feedback integrated assembly and a multi-stage hydraulic cylinder group, wherein the power source comprises a three-phase asynchronous motor, a plunger variable pump and a proportional control valve, the output end of the three-phase asynchronous motor is connected to the plunger variable pump, and the output end of the plunger variable pump is connected to the proportional control valve; the synchronous oil cylinder assembly comprises a synchronous hydraulic cylinder and a zero-leakage electromagnetic reversing valve A, and the power source and the synchronous hydraulic cylinder are connected through the zero-leakage electromagnetic reversing valve A; the multi-stage hydraulic cylinder group comprises a multi-stage hydraulic cylinder and a zero-leakage electromagnetic reversing valve B, and the synchronous hydraulic cylinder and the multi-stage hydraulic cylinder are connected through the zero-leakage electromagnetic reversing valve B; the feedback integrated assembly comprises a reversing circuit, a synchronous hydraulic cylinder automatic filling circuit, and a compensation circuit, the reversing circuit comprises a zero-leakage reversing valve, the synchronous hydraulic cylinder automatic filling circuit comprises a hydraulically controlled one-way valve, a shuttle valve and a high-speed electromagnetic reversing valve, and the compensation circuit comprises a displacement sensor, a pressure sensor and a safety valve.

[0006] Preferably, an air filter and a liquid level gauge are provided in the oil tank, and an oil return filter is also provided in the loop pipeline of the oil tank.

[0007] Preferably, the power source is connected to the oil tank via a one-way valve, a relief valve, a proportional relief valve, a pressure gauge, and a high-pressure filter.

[0008] Preferably, a hollow piston rod is provided inside the synchronous hydraulic cylinder, a protective sleeve is provided on the end surface of the synchronous hydraulic cylinder, and the synchronous cylinder assembly further comprises a limit switch, and the limit switch is located on the inner wall of the protective sleeve.

[0009] Preferably, the outer wall of the synchronous hydraulic cylinder is also provided with an air guide hole.

[0010] Preferably, an electric control system is also included, and the electric control system adopts one of PLC control, digital closed-loop control or PID control.

[0011] Preferably, the number of the zero-leakage electromagnetic reversing valves B is two, which are respectively connected to the input end and the output end of the multi-stage hydraulic cylinder, and the output end of the multi-stage hydraulic cylinder is also connected to a pipeline explosion-proof valve.

[0012] Preferably, the shuttle valve and the synchronous hydraulic cylinder are connected via a counter-balancing valve.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the power source flow is regulated through the open-loop proportional valve to ensure efficient power output; the synchronous hydraulic cylinder is provided with an automatic filling circuit of the synchronous hydraulic cylinder, and the compensation circuit can automatically fill the circuit to remove a small amount of air in the system pipeline, continuously add fresh oil, reduce gas accumulation, and eliminate gas-induced asynchronism; a synchronous control scheme for multi-stage hydraulic cylinders is provided, with a synchronization accuracy of ±0.03%, which can achieve low-cost and high-precision synchronous control; generally, synchronous control of 2-6 multi-stage cylinders can be achieved, and the synchronization accuracy can be below 1mm; the synchronous compensation valve is relatively small, less than 6 diameters; if higher accuracy and dynamic effects are required, a servo valve can be used to compensate for the synchronization error; the synchronization accuracy can reach below 0.1mm; redundant control avoids out-of-control accidents, and manual emergency handling of synchronization accidents when feedback signals fail can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is the control principle diagram of the present invention;

[0016] Figure 3 It is a schematic diagram of the top view structure of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the synchronous hydraulic cylinder of the present invention;

[0018] In the figure: 1. Power source; 11. Three-phase asynchronous motor; 12. Plunger variable pump; 13. Proportional control valve; 2. Oil tank; 21. Air filter; 22. Liquid level gauge; 23. Return oil filter; 3. Synchronous cylinder assembly; 31. Synchronous hydraulic cylinder; 311. Air guide hole; 312. Hollow piston rod; 313. Protective cover; 32. Zero leakage electromagnetic reversing valve A; 33. Limit switch; 4. Feedback integrated assembly; 41. Hydraulic control one-way valve; 42. Shuttle valve; 43. High-speed electromagnetic reversing valve; 51. Multi-stage hydraulic cylinder; 511. Pipeline explosion-proof valve; 52. Zero leakage electromagnetic reversing valve B; 61. Displacement sensor; 62. Pressure sensor; 63. Safety valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-4The present invention provides a technical solution: a hydraulic synchronous control device for disassembling and assembling a motor vehicle bogie, comprising a power source 1, an oil tank 2, a synchronous oil cylinder assembly 3, a feedback integrated assembly 4 and a multi-stage hydraulic cylinder group, wherein the power source 1 comprises a three-phase asynchronous motor 11, a plunger variable pump 12 and a proportional regulating valve 13, wherein the output end of the three-phase asynchronous motor 11 is connected to the plunger variable pump 12, and the output end of the plunger variable pump 12 is connected to the proportional regulating valve 13; the synchronous oil cylinder assembly 3 comprises a synchronous hydraulic cylinder 31 and a zero-leakage electromagnetic reversing valve A32, and a feedback integrated assembly 4 and a multi-stage hydraulic cylinder group are connected between the power source 1 and the synchronous hydraulic cylinder 31. The multistage hydraulic cylinder group includes a multistage hydraulic cylinder 51 and a zero-leakage electromagnetic reversing valve B52, and the synchronous hydraulic cylinder 31 and the multistage hydraulic cylinder 51 are connected through the zero-leakage electromagnetic reversing valve B52; the feedback integrated component 4 includes a reversing circuit, a synchronous hydraulic cylinder automatic filling circuit, and a compensation circuit. The reversing circuit includes a zero-leakage reversing valve. The synchronous hydraulic cylinder automatic filling circuit includes a hydraulically controlled one-way valve 41, a shuttle valve 42 and a high-speed electromagnetic reversing valve 43. The compensation circuit includes a displacement sensor 61, a pressure sensor 62 and a safety valve 63.

[0021] See also Figure 2 In this embodiment, the hydraulic control system is designed according to the schematic diagram. The compensation valve is selected according to the maximum error of the synchronization element. For example, if the system flow is 100L / min and the synchronization accuracy of the shunt motor is ±2.5%, the compensation valve or damper is selected according to the compensation flow of 5L / min. If the synchronization accuracy of the synchronous hydraulic cylinder is ±0.5%, the compensation valve or damper is selected according to the compensation flow of 1L / min. The compensation circuit should be placed near the synchronization element to reduce the influence of the pipeline length on the synchronization accuracy. The main control circuit and the compensation circuit are designed on an integrated block. Each circuit of the compensation circuit must be equipped with a pressure measuring port for a pressure gauge or an additional pressure sensor. When laying out the multi-stage cylinder pipeline, an exhaust hole is set at the highest position of the pipeline for early exhaust. The synchronous hydraulic cylinder is used as an open-loop synchronous control and an automatic filling circuit must be installed. For details, please refer to Figure 2 When designing the synchronous cylinder, it is necessary to consider whether the strength of the piston rod after pressurization meets the requirements. Otherwise, the hollow piston rod 312 of the synchronous hydraulic cylinder 31 may break. For specific structure, refer to Figure 4 , each chamber of the synchronous hydraulic cylinder 31 must be designed with an air guide hole 311.

[0022] In this embodiment, the model of the three-phase asynchronous motor 11 is Y2-1, the model of the displacement sensor 61 is W-DC, and the model of the pressure sensor 62 is AS-131.

[0023] Furthermore, an air filter 21 and a liquid level meter 22 are provided in the oil tank 2 , and an oil return filter 23 is also provided in the loop pipeline of the oil tank 2 .

[0024] In this embodiment, an air filter 21 and a liquid level meter 22 are provided in the oil tank 2, which facilitates intuitive observation of the oil amount in the oil tank 2, and the quality of the oil is ensured by the air filter 21. A return oil filter 23 is also provided in the loop pipeline of the oil tank 2, which can filter the oil loop and improve the oil quality.

[0025] Furthermore, the power source 1 is connected to the oil tank 2 via a one-way valve, a relief valve, a proportional relief valve, a pressure gauge, a high-pressure filter, and the oil tank 2 .

[0026] In this embodiment, the power source 1 is connected to the oil tank 2 through a one-way valve, a relief valve, a proportional relief valve, a pressure gauge, a high-pressure filter, and the power source 1 can provide a continuous and stable high-pressure flow, and the flow is open-loop regulated by the proportional control valve 13 to ensure efficient power output.

[0027] Furthermore, a hollow piston rod 312 is provided inside the synchronous hydraulic cylinder 31 , a protective sleeve 313 is provided on the end surface of the synchronous hydraulic cylinder 31 , and the synchronous cylinder assembly 3 also includes a limit switch 33 , which is located on the inner wall of the protective sleeve 313 .

[0028] In this embodiment, a hollow piston rod 312 is provided inside the synchronous hydraulic cylinder 31. The weight of the extended piston rod is reduced to reduce the seal wear caused by the eccentric load. A protective sleeve 313 is provided on the end face of the synchronous hydraulic cylinder 31. The synchronous cylinder assembly 3 also includes a limit switch 33. The limit switch 33 is located on the inner wall of the protective sleeve 313, which can reduce the impact of the synchronous hydraulic cylinder in place and improve its service life.

[0029] Furthermore, an air guide hole 311 is further provided on the outer wall of the synchronous hydraulic cylinder 31 .

[0030] In this embodiment, an air guide hole 311 is further provided on the outer wall of the synchronous hydraulic cylinder 31 for early exhaust. Otherwise, the piston rod of the synchronous hydraulic cylinder 31 may break.

[0031] Furthermore, it also includes an electric control system, which adopts one of PLC control, digital closed-loop control or PID control.

[0032] In this embodiment, the electronic control system adopts PID control, and the operation process is as follows: the power source 1 starts >> the synchronous cylinder assembly 3 and the synchronous hydraulic cylinder automatic filling circuit complete the automatic filling circuit action >> the multi-stage hydraulic cylinder 51 lifts or lowers >> the compensation circuit in the feedback integrated assembly 4 completes the compensation circuit to automatically compensate for the synchronization error.

[0033] Furthermore, there are two zero-leakage electromagnetic reversing valves B52 , which are respectively connected to the input end and the output end of the multi-stage hydraulic cylinder 51 . The output end of the multi-stage hydraulic cylinder 51 is also connected to a pipeline explosion-proof valve 511 .

[0034] In this embodiment, the accuracy of synchronous lifting of the multi-stage hydraulic cylinder 51 can be improved.

[0035] Furthermore, the shuttle valve 42 and the synchronous hydraulic cylinder 31 are connected via a counterbalance valve.

[0036] In this embodiment, the shuttle valve 42 and the synchronous hydraulic cylinder 31 are connected via a counter-valve. Due to the particularity of the synchronous hydraulic cylinder 31, gas is extremely harmful to hydraulic synchronization. The automatic filling circuit of the synchronous cylinder can remove a small amount of air in the system pipeline, continuously add fresh oil, reduce gas accumulation, and eliminate gas-induced asynchronism.

[0037] The working principle and use process of the present invention: After the present invention is installed, the power source 1 adopts a load-sensitive plunger variable pump 12, which is driven by an ordinary three-phase asynchronous motor 11. The power source 1 can provide a continuous and stable high-pressure flow, and the flow is open-loop regulated by a proportional control valve 13 to ensure efficient power output. The synchronous hydraulic cylinder 31 ensures basic synchronization accuracy to ensure that manual adjustment in the state of feedback failure will not cause accidents; at the same time, it cooperates with the feedback loop to ensure the normal operation of the system. The synchronous hydraulic cylinder 31 can also be replaced by a high-precision shunt motor. When the shunt motor is used, the automatic filling circuit of the step hydraulic cylinder is removed; the synchronization accuracy of the synchronous hydraulic cylinder is higher than that of the shunt motor, but the synchronous hydraulic cylinder is larger in size and has a higher cost. The specific selection depends on the actual situation. The reversing circuit mainly includes a zero-leakage reversing valve, which can control the reversing of the multi-stage cylinder. The synchronous hydraulic cylinder automatic filling circuit includes a hydraulically controlled one-way valve 41, a shuttle valve 42 and a high-speed electromagnetic reversing valve 43. The compensation circuit includes a displacement sensor 61, a pressure sensor 62 and a safety valve 63, a compensation electromagnetic valve, a damper, etc. The main feedback sensor adopts a displacement sensor 61, and the auxiliary feedback sensor adopts a pressure sensor 62. The compensation zero electromagnetic valve and the damper are used to eliminate the synchronization error. The safety valve and the pressure sensor 62 are used to eliminate the occurrence of accidents. When the feedback fails, it will inevitably be out of sync. At this time, the multi-stage cylinder is extended longer and the force is greater. At this time, its pressure will be higher than the normal value, and the auxiliary feedback system will shut down for protection.

[0038] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. In addition, the term "coupled" includes any direct and indirect electrical coupling means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically coupled to the second device, or indirectly electrically coupled to the second device through other devices or coupling means. The subsequent description of the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be determined by the attached claims.

[0039] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0040] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A hydraulic synchronous control device for disassembling and assembling a motor vehicle bogie, comprising a power source (1), an oil tank (2), a synchronous oil cylinder assembly (3), a feedback integrated assembly (4) and a multi-stage hydraulic cylinder group, characterized in that: The power source (1) comprises a three-phase asynchronous motor (11), a plunger variable pump (12) and a proportional control valve (13); the output end of the three-phase asynchronous motor (11) is connected to the plunger variable pump (12), and the output end of the plunger variable pump (12) is connected to the proportional control valve (13); The synchronous cylinder assembly (3) comprises a synchronous hydraulic cylinder (31) and a zero-leakage electromagnetic reversing valve A (32), wherein the power source (1) and the synchronous hydraulic cylinder (31) are connected via the zero-leakage electromagnetic reversing valve A (32); a hollow piston rod (312) is provided inside the synchronous hydraulic cylinder (31), and a protective sleeve (313) is provided on the end surface of the synchronous hydraulic cylinder (31); the synchronous cylinder assembly (3) further comprises a limit switch (33), wherein the limit switch (33) is located on the inner wall of the protective sleeve (313), and an air guide hole (311) is also provided on the outer wall of the synchronous hydraulic cylinder (31); The multi-stage hydraulic cylinder group comprises a multi-stage hydraulic cylinder (51) and a zero-leakage electromagnetic reversing valve B (52), and the synchronous hydraulic cylinder (31) and the multi-stage hydraulic cylinder (51) are connected via the zero-leakage electromagnetic reversing valve B (52); The feedback integrated component (4) comprises a reversing circuit, a synchronous hydraulic cylinder automatic filling circuit, and a compensation circuit. The reversing circuit comprises a zero-leakage reversing valve. The synchronous hydraulic cylinder automatic filling circuit comprises a hydraulically controlled one-way valve (41) connected to a zero-leakage electromagnetic reversing valve B (52), a shuttle valve (42) and a high-speed electromagnetic reversing valve (43) arranged between the synchronous hydraulic cylinder (31) and the zero-leakage electromagnetic reversing valve A (32). The compensation circuit comprises a displacement sensor (61) arranged on the multi-stage hydraulic cylinder (51) and a pressure sensor (62) and a safety valve (63) arranged on a circuit pipeline of the oil tank (2).

2. The hydraulic synchronous control device for assembly and disassembly of a motor vehicle bogie according to claim 1, characterized in that: An air filter (21) and a liquid level meter (22) are arranged in the oil tank (2), and an oil return filter (23) is also arranged in the loop pipeline of the oil tank (2).

3. The hydraulic synchronous control device for assembly and disassembly of a motor vehicle bogie according to claim 1, characterized in that: The power source (1) is connected to the oil tank (2) via a one-way valve, a relief valve, a proportional relief valve, a pressure gauge, a high-pressure filter.

4. The hydraulic synchronous control device for disassembling and assembling a motor vehicle bogie according to claim 1, characterized in that: It also includes an electric control system, which adopts one of PLC control, digital closed-loop control or PID control.

5. The hydraulic synchronous control device for assembly and disassembly of a motor vehicle bogie according to claim 1, characterized in that: There are two zero-leakage electromagnetic reversing valves B (52), which are respectively connected to the input end and the output end of the multi-stage hydraulic cylinder (51); the output end of the multi-stage hydraulic cylinder (51) is also connected to a pipeline explosion-proof valve (511).

6. The hydraulic synchronous control device for assembly and disassembly of a motor vehicle bogie according to claim 1, characterized in that: The shuttle valve (42) and the synchronous hydraulic cylinder (31) are connected via a counterbalance valve.

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