阅读说明：本技术 一种钢轨打磨列车气动控制系统及控制方法 (Pneumatic control system and control method for steel rail grinding train ) 是由 张慧涛 毕凤博 苗永春 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种钢轨打磨列车气动控制系统及控制方法,涉及钢轨打磨领域。该气动控制系统总气源通过所述总气源开关阀将气源通过所述气源分支结构传递给所述气源控制模块。打磨作业开始时,背压开关阀通电,控制背压气源通过,微机控制系统发出电机下降指令后,工作压开关阀依次通电,工作压气源通过；电机开始下降后,控制同一个电机的背压和工作压比例阀协调控制,实现相应电机的平稳下降及加压；比例阀减压,使得压力与打磨背压接近,两位三通开关阀得电转换；气源通过两位三通开关阀,再经比例阀调整后进入流量放大器；气动控制系统是微机网络控制系统与执行机构之间的联系纽带,保证了可靠、高效以及稳定的控制机制。(The invention discloses a pneumatic control system and a pneumatic control method for a steel rail grinding train, and relates to the field of steel rail grinding. The main gas source of the pneumatic control system transmits a gas source to the gas source control module through the gas source branch structure through the main gas source switch valve. When the polishing operation starts, the back pressure switch valve is electrified to control a back pressure gas source to pass through, and after the microcomputer control system sends a motor descending instruction, the working pressure switch valve is sequentially electrified, and the working pressure gas source passes through; after the motor begins to descend, the back pressure and working pressure proportional valve of the same motor are controlled to be coordinated and controlled, and stable descending and pressurization of the corresponding motor are realized; the proportional valve is decompressed, so that the pressure is close to the polishing back pressure, and the two-position three-way switch valve is electrified and converted; the air source enters the flow amplifier after passing through the two-position three-way switch valve and then being adjusted by the proportional valve; the pneumatic control system is a link between the microcomputer network control system and the actuating mechanism, and ensures a reliable, efficient and stable control mechanism.)

1. A pneumatic control system is characterized by comprising a main air source switch valve, an air source branch module and an air source control module, wherein a main air source transmits an air source to the air source control module through the air source branch structure through the main air source switch valve.

2. The pneumatic control system according to claim 1, wherein the air supply branching module 8 divides the total air supply into five paths:

the first path is a grinding motor cylinder backpressure pressure source which is added to a cylinder lower cavity of each working motor after being controlled and adjusted;

the second path is a grinding motor cylinder working pressure source which is added to the cylinder upper cavity of each working motor after being controlled and adjusted;

the third path of connected air source control module is connected with the valve island, the valve island can realize the independent control of the valve block of the valve island and the 12 paths of CPI output through the software programming of the upper computer, and the valve island accessory CPI output module can realize the control of 12 two-position three-way electromagnetic valves on the air circuit board of the proportional electromagnetic valve;

the fourth path is connected to the interface boards of the switch valve and the proportional valve component and is a control pressure source of working pressure;

and the fifth path is connected to the pressure switch assembly, and the two pressure switches respectively convert the air source pressure value of the minimum air pressure of the polishing operation and the minimum back pressure of the polishing motor into electric signals and feed the electric signals back to the microcomputer network control system so as to be controlled in real time.

3. The pneumatic control system of claim 1, further comprising a fine filter mounted between the on-off valve and the branching module for purging a gas source.

4. The pneumatic control system of claim 2, wherein the pressure switch assembly is a pressure sensor assembly that converts a source air pressure value into an electrical signal.

5. The pneumatic control system of claim 2, wherein the branching module divides the air supply into five paths by a quick-connect threaded connector;

the quick-plug threaded connector is provided with three quick-plug threaded connectors which are respectively located at three air source pressure positions, wherein one air source pressure is used for assisting, the other two air sources are connected with the blue air pipe and the black air pipe for testing, during testing, the blue air pipe and the black air pipe are connected onto a plug of the pressure detection device, the plug can be used for detecting input and output back pressure values and working pressure values, and numerical values of the plug can be read out from a small display screen of the pressure detection device.

6. A pneumatic system of a steel rail grinding train is characterized by comprising a network control system, the pneumatic control system and an execution structure, wherein the pneumatic control system is connected with the microcomputer control system and the execution mechanism respectively, and the pneumatic control system has the functions of air source processing, dynamic and static pressure testing, grinding pressure adjustment and minimum back pressure protection.

7. A pneumatic control method of a steel rail grinding train is characterized by comprising the following steps:

s1, when the polishing operation starts, the back pressure switch valve is electrified to control the back pressure air source to pass through, after the microcomputer control system sends out a motor descending instruction, the working pressure switch valve is sequentially electrified, and the working pressure air source passes through;

s2, after the motor begins to descend, the back pressure and working pressure proportional valve of the same motor are controlled to coordinate and control, and stable descending and pressurization of the corresponding motor are realized;

s3, reducing the pressure of the proportional valve to enable the pressure to be close to the grinding back pressure, and electrifying and converting the two-position three-way switch valve;

s4, enabling the air source to pass through a two-position three-way switch valve and then enter a flow amplifier after being adjusted by a proportional valve;

s5, repeating the steps S3 and S4.

8. The control method according to claim 7, wherein the step S3 further includes: if the pressure of the proportional valve after pressure reduction is close to the grinding back pressure before the electricity conversion of the two-position three-way switch valve, otherwise, the back pressure of the control pressurizing cylinder is suddenly changed to cause impact.

9. The control method according to claim 7, wherein the step S5 further includes: after the two-position three-way switch valve is powered off every time, the corresponding proportional valve automatically reduces the pressure and adjusts the pressure to the minimum, namely when the switch valve is powered on next time, the control back pressure after pressure reduction is ensured to be the total back pressure.

10. The control method according to claim 7, characterized in that the adopted backpressure regulation method is specifically:

firstly, a working condition switch is switched to an operation mode, whether back pressure is given or not is judged, and if no back pressure is given, the output value set by the back pressure is 0; if so, continuously judging whether the mode is a manual mode, if so, outputting the set value of the back pressure according to a manual operation formula, and if not, outputting the set value of the back pressure according to an automatic deflection formula.

Technical Field

The invention relates to the field of rail grinding, in particular to a pneumatic control system and a pneumatic control method for a rail grinding train.

Background

In the 60 s of the 20 th century, the first sanding vehicle in the world was manufactured by the company spenno, switzerland; the first grinding train was introduced from the SPENO company in 1989 by the Ministry of railways in China. In 2007, in 7 months, Beijing twenty-seven locomotive LLC company of North China, collaborates with SPENO company of Switzerland to produce 10-row GMC96 type steel rail grinding trains. In 11 and 16 days in 2009, GMC96 type steel rail grinding trains are developed and completed by twenty-seven equipment companies of North China and are off-line. The train consists of a power car and six grinding operation cars, the speed per hour reaches 100 kilometers, 99 different grinding modes can be rapidly determined through a self-provided detection device, the defects of wave-shaped abrasion of steel rails, steel rail burrs, saddle-shaped abrasion, weld recesses, scale cracks and the like of the high-speed railway are quickly ground, and the grinding precision reaches 0.02 millimeter. The GMC96 type steel rail grinding train has a complex structure and advanced control, and integrates the technologies of machine, electricity, liquid, gas and computer. However, a pneumatic control system which is well suitable for being matched with a grinding vehicle is still not developed in China.

With the requirements of speed increasing and heavy load of railways in China, the requirement on line maintenance is higher and higher, and rail grinding becomes an important measure for daily maintenance of railways. At present, most of domestic steel rail grinding vehicles come from import or foreign cooperation production and are high in price, wherein a pneumatic control system of the grinding vehicle is one of three core systems of the steel rail grinding vehicle, foreign manufacturers have no technical transfer, the pneumatic control technology is monopolized by foreign companies all the time, the localization of the grinding vehicle is to be really realized, and the pneumatic control system is a technical bottleneck which must be broken through.

Disclosure of Invention

The invention aims to provide a pneumatic control system and a pneumatic control method for a steel rail grinding train, so that the problems in the prior art are solved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a pneumatic control system comprises a main air source switch valve, an air source branch module and an air source control module, wherein a main air source transmits an air source to the air source control module through the air source branch structure through the main air source switch valve.

Preferably, the air supply branching module divides the total air supply into five paths:

the first path is a grinding motor cylinder backpressure pressure source which is added to a cylinder lower cavity of each working motor after being controlled and adjusted;

the second path is a grinding motor cylinder working pressure source which is added to the cylinder upper cavity of each working motor after being controlled and adjusted;

the third path of connected air source control module is connected with the valve island, the valve island can realize the independent control of the valve block of the valve island and the 12 paths of CPI output through the software programming of the upper computer, and the valve island accessory CPI output module can realize the control of 12 two-position three-way electromagnetic valves on the air circuit board of the proportional electromagnetic valve;

the fourth path is connected to the interface boards of the switch valve and the proportional valve component and is a control pressure source of working pressure;

and the fifth path is connected to the pressure switch assembly, and the two pressure switches respectively convert the air source pressure value of the minimum air pressure of the polishing operation and the minimum back pressure of the polishing motor into electric signals and feed the electric signals back to the microcomputer network control system so as to be controlled in real time.

Preferably, the system further comprises a fine filter installed between the switching valve and the branching module for purifying the gas source.

Preferably, the pressure switch assembly is a pressure sensor assembly, and the pressure sensor assembly converts the air source pressure value into an electric signal.

Preferably, the branch module divides the gas source into five paths through a quick-plug threaded connector;

the quick-plug threaded connector is provided with three quick-plug threaded connectors which are respectively located at three air source pressure positions, wherein one air source pressure is used for assisting, the other two air sources are connected with the blue air pipe and the black air pipe for testing, during testing, the blue air pipe and the black air pipe are connected onto a plug of the pressure detection device, the plug can be used for detecting input and output back pressure values and working pressure values, and numerical values of the plug can be read out from a small display screen of the pressure detection device.

Another objective of the present invention is to provide a pneumatic system of a rail grinding train, comprising a network control system, the pneumatic control system and an execution structure according to any one of claims 1 to 5, wherein the pneumatic control system is respectively connected to the microcomputer control system and the execution mechanism, and the pneumatic control system has functions of air source processing, dynamic and static pressure testing, grinding pressure adjustment, and minimum back pressure protection.

The invention finally aims to provide a pneumatic control method of a steel rail grinding train, which comprises the following steps:

s1, when the polishing operation starts, the back pressure switch valve is electrified to control the back pressure air source to pass through, after the microcomputer control system sends out a motor descending instruction, the working pressure switch valve is sequentially electrified, and the working pressure air source passes through;

s2, after the motor begins to descend, the back pressure and working pressure proportional valve of the same motor are controlled to coordinate and control, and stable descending and pressurization of the corresponding motor are realized;

s3, reducing the pressure of the proportional valve to enable the pressure to be close to the grinding back pressure, and electrifying and converting the two-position three-way switch valve;

s4, enabling the air source to pass through a two-position three-way switch valve and then enter a flow amplifier after being adjusted by a proportional valve;

s5, repeating the steps S3 and S4.

Preferably, the step S3 further includes: if the pressure of the proportional valve after pressure reduction is close to the grinding back pressure before the electricity conversion of the two-position three-way switch valve, otherwise, the back pressure of the control pressurizing cylinder is suddenly changed to cause impact.

Preferably, the step S5 further includes: after the two-position three-way switch valve is powered off every time, the corresponding proportional valve automatically reduces the pressure and adjusts the pressure to the minimum, namely when the switch valve is powered on next time, the control back pressure after pressure reduction is ensured to be the total back pressure.

Preferably, the backpressure regulation method is as follows:

firstly, a working condition switch is switched to an operation mode, whether back pressure is given or not is judged, and if no back pressure is given, the output value set by the back pressure is 0; if so, continuously judging whether the mode is a manual mode, if so, outputting the set value of the back pressure according to a manual operation formula, and if not, outputting the set value of the back pressure according to an automatic deflection formula.

The invention has the beneficial effects that:

the invention discloses a pneumatic control system and a control method of a steel rail grinding train, the pneumatic control system in the technical scheme is a connection link between a microcomputer network control system and an actuating mechanism, and a reliable, efficient and stable control mechanism is ensured; the method is accurate in control and ensures the polishing effect; the technical blank that a pneumatic control system of one of three cores in a grinding control system is not available in a steel rail grinding train in China is filled.

Drawings

FIG. 1 is a schematic diagram of microcomputer network control and pneumatic control;

FIG. 2 is a schematic diagram of the control of the pneumatic control system;

FIG. 3 is a block diagram of a pneumatic control system;

FIG. 4 is a back pressure regulation flow diagram;

fig. 5 is a working pressure adjustment flowchart.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.