Method of hydraulic control of a friction test of a switch machine

Abstract

The present application belongs to a kind of hydraulic control switch machine friction test method, comprising: hydraulic cylinder (2) and hydraulic friction function valve block group, hydraulic friction function valve block group is made of oil passage transition plate (4) and two normally open two-way stop cartridge valve (5), characterized by: connecting hydraulic friction function valve block group between hydraulic cylinder (2) and hydraulic main oil line system (6);The oil passage interface (8) of the hydraulic friction function valve block group is matched with the oil port of hydraulic cylinder (2) and hydraulic main oil line system (6);When the switch machine to be tested is installed in place on the test bench, the hydraulic piston rod of hydraulic cylinder (2) and the action rod of switch machine are connected through joint, and the friction test and characteristic test of switch machine are completed.The present application is beneficial to the improvement of the overall service life of hydraulic system, and is convenient for troubleshooting, it can realize the modular installation of hydraulic control function, automate the operation process of switch machine friction test, and can effectively lock the hydraulic cylinder.

Description

Technical Field

[0001] This invention pertains to testing and inspection systems in the field of rail transit, specifically relating to a method for friction testing of a hydraulically controlled switch machine. It eliminates the need for redesigning and fabricating hydraulic circuit boards, enabling modular installation of hydraulic circuits and providing multiple possibilities for upgrading existing switch machine test benches' friction testing methods. Technical Background

[0002] Railways are the main artery of the national economy, a vital national infrastructure, and a popular mode of transportation. The quality of products entering the railway system must be strictly inspected according to relevant standards. Switch machines are key equipment in the railway turnout switching process, and various types of switch machine test benches are available on the market for performance testing. Among them, the widely used hydraulic load test bench uses hydraulic cylinders to simulate the load force of the turnout, testing various technical performance indicators of the switch machine's mechanical structure and electrical control. Hydraulics have self-lubricating and maintenance-free characteristics, and when combined with control circuits, the testing process can be automated.

[0003] According to relevant industry standards, testing equipment is required to test the friction force of switch machines. Most test benches rely on mechanical structures for friction testing, such as switch machine actuators with fixed pins to block the rotation. Such test setups require manual operation, and the pins need to be replaced for other tests. While this isn't inconvenient for small-batch testing in laboratories for new product development, it significantly reduces testing efficiency and is time-consuming and labor-intensive for factory mass production and final inspection. Existing automatic friction-generating devices from some manufacturers, such as those using lifting blocks or hydraulic valves, suffer from short lifespans and low reliability.

[0004] Given the market demand for automated, reliable, and efficient testing equipment, we have further expanded the advantages of the previously developed hydraulic load test bench for switch machines. By utilizing the mechanical closing characteristics of cartridge valves to lock the hydraulic cylinders, we have achieved modular installation of the hydraulic circuit locking function, providing multiple possibilities for upgrading the existing friction test methods of the hydraulic circuit. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic control method for friction testing of switch machines that is beneficial to improving the overall service life of the hydraulic system, facilitating fault diagnosis, and improving maintenance efficiency. It enables modular installation of hydraulic control functions, automates the operation process of switch machine friction testing, and effectively locks the hydraulic cylinder to ensure the effectiveness of friction force testing and improve the locking force of the hydraulic system.

[0006] The technical solution of the present invention is: a method for friction testing of a hydraulically controlled switch machine, characterized in that: based on the hydraulic action principle of the switch machine test bench, an oil circuit locking mode is added on the basis of the hydraulic load force output during reversing, so as to realize the function of hydraulic cylinder blocking the switch machine for friction testing.

[0007] The hydraulic circuit board of the test hydraulic system does not need to be re-processed. The physical preparation of the new friction test method can be completed by connecting the valve block assembly with hydraulic cartridge valves to the existing hydraulic system by using the inlet and outlet ports on the hydraulic cylinder.

[0008] In terms of control circuit, only the on / off control of two 24V DC power supplies is added. Since the friction test and characteristic test are independent control modes, the control program for hydraulic load characteristic test does not need to be modified. Only the control of the two newly added 24V DC power supplies needs to be added during the friction test.

[0009] During the switch machine characteristic test, the electromagnetic control of the hydraulic cartridge valve is in de-energized mode, allowing bidirectional oil flow between the manifold and the hydraulic cylinder. The test is conducted according to the control circuit and program, in conjunction with the switch machine's direction of movement. During the friction test, the hydraulic system stops operating; only the 24V DC power supply controlling the hydraulic cartridge valve is turned on. The valve core moves, closing the inlet and outlet ports, cutting off oil flow between the manifold and the hydraulic cylinder, thus locking the hydraulic cylinder and rigidly sealing the switch machine. The switch machine moves in both pushing and pulling directions for a specified time, and the test bench automatically collects relevant data from the friction test. In different test modes, the interface (i.e., the pin) between the switch machine and the hydraulic load does not need to be disassembled, simplifying the test procedure. The mechanical closing characteristic of the cartridge valve improves the reliability and lifespan of the test bench.

[0010] The advantages of this invention are:

[0011] By adding hydraulic valve block assemblies, the control function of the hydraulic circuit is simplified, and the modular installation of hydraulic control functions is realized. This is beneficial to improving the overall service life of the hydraulic system, and it also facilitates troubleshooting and improves the efficiency of maintenance.

[0012] By utilizing the advantages of hydraulic cartridge valves, such as reliable closure of the channel, compact installation space, and electromagnet control, the operation process of the switch machine friction test is automated. It can also effectively lock the hydraulic cylinder, improve the hydraulic locking force, and ensure the effectiveness of the friction test. Attached Figure Description

[0013] Figure 1 Hydraulic circuit schematic diagram with integrated friction testing function;

[0014] Figure 2 A schematic diagram of the physical installation of the integrated friction testing function;

[0015] Figure 3 Schematic diagram of hydraulic friction function valve block assembly;

[0016] Figure 4 A flowchart illustrating the steps involved in adding a friction test to a hydraulically controlled switch machine.

[0017] In the diagram: 1. Oil pump motor and oil tank assembly; 2. Hydraulic cylinder; 3. Original friction test insertion hole; 4. Oil circuit transition plate; 5. Two normally open bidirectional shut-off cartridge valves; 6. Hydraulic main oil circuit system; 7. Relief valve; 8. Oil circuit channel interface. Detailed Implementation

[0018] To further illustrate the technical means and methods adopted by the present invention to achieve its intended purpose, the specific embodiments, structural features, and methods of the present invention are described in detail below with reference to the accompanying drawings and examples:

[0019] Example 1 uses an existing hydraulic load oil circuit system as the implementation object.

[0020] like Figure 2 As shown, this invention relates to a method for testing the friction of a hydraulically controlled switch machine, comprising: a hydraulic friction functional valve block assembly consisting of a hydraulic cylinder 2, an oil circuit transition plate 4, and two normally open bidirectional shut-off cartridge valves 5. The method is characterized in that: the hydraulic friction functional valve block assembly (comprising the oil circuit transition plate 4 and the two normally open bidirectional shut-off cartridge valves 5) is connected between the hydraulic cylinder 2 and the main hydraulic circuit system 6; the oil circuit channel interface 8 of the hydraulic friction functional valve block assembly (comprising the oil circuit transition plate 4 and the two normally open bidirectional shut-off cartridge valves 5) matches the oil ports of the hydraulic cylinder 2 and the main hydraulic circuit system 6; when the switch machine under test is installed on the test bench, the hydraulic piston rod of the hydraulic cylinder 2 and the switch machine actuating rod are connected through a connector to complete the friction test and characteristic test of the switch machine. It does not require additional pins to fix the original friction test insertion hole 3 to the test bench for the switch machine friction test.

[0021] Once the hydraulic load force is prepared according to the test model (turn on the power to power on the oil pump motor and the motor in the oil tank group 1 to rotate, the hydraulic main oil circuit system 6 can control the movement and reversal of the hydraulic cylinder 2, and adjust the hydraulic load force through the relief valve 7), the friction test of the switch machine is carried out first.

[0022] The friction test of the switch machine includes: turning on the control circuit. Figure 1 The 24V DC power supply to the left and right normally open bidirectional shut-off cartridge valves 5 of the hydraulic cylinder 2 is turned off, thereby cutting off the oil flow between the oil circuit transition plate 4 and the hydraulic cylinder 2 in the hydraulic friction function valve block assembly (composed of oil circuit transition plate 4 and normally open bidirectional shut-off cartridge valves 5), thus locking the hydraulic cylinder 2 and rigidly blocking the switch machine.

[0023] According to the control program, during the push and pull movements of the switch machine, the test bench automatically collects relevant data of the friction test, judges whether the test data is qualified, records the test table, and completes the friction test.

[0024] The switch machine characteristic test includes: disabling the hydraulic friction function valve block assembly (composed of oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5) connected to the switch machine, allowing the oil pumped by the oil pump motor and oil tank assembly 1 to flow freely between the hydraulic main oil circuit system 6 and the hydraulic cylinder 2, and having the switch machine drive the hydraulic load to pull in and out normally, repeating the action 3 to 5 times. During this period, the test bench automatically collects relevant data of the switch machine, determines whether the test data is qualified, records the test table, and completes the switch machine characteristic test. If all test results are qualified, the inspection of the switch machine is completed; otherwise, it is repaired and returned.

[0025] The parameters for switch machine characteristic testing are common-sense parameters, and this invention will not elaborate on them.

[0026] Example 2

[0027] like Figure 2 As shown, this invention relates to a method for testing the friction of a hydraulically controlled switch machine, comprising: a switch machine test bench, a hydraulic cylinder 2, and a hydraulic friction function valve block assembly (composed of an oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5). The method is characterized in that: the hydraulic friction function valve block assembly (composed of an oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5) is connected between the hydraulic cylinder 2 and the hydraulic main oil circuit system 6; the oil circuit channel interface 8 of the hydraulic friction function valve block assembly (composed of an oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5) matches the oil ports of the hydraulic cylinder 2 and the hydraulic main oil circuit system 6; when the switch machine under test is installed on the test bench, the hydraulic piston rod of the hydraulic cylinder 2 and the switch machine actuating rod are connected through a connector to complete the friction test and characteristic test of the switch machine. It does not require additional pins to fix the original friction test insertion hole 3 to the test bench for the switch machine friction test.

[0028] A hydraulic friction function valve block assembly (composed of oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valve 5) is connected between hydraulic cylinder 2 and hydraulic main oil circuit system 6.

[0029] like Figure 3 As shown, the hydraulic friction function valve block assembly includes an oil circuit transition plate 4 and a two normally open bidirectional shut-off cartridge valve 5. The hydraulic friction function valve block assembly is either installed in a pipeline manner and transitioned through an oil circuit channel interface 8 (or transitioned through an interface using other hydraulic friction function implementation methods), or the control method of the two normally open bidirectional shut-off cartridge valve 5 is an electromagnetic switch or a handle switch.

[0030] In terms of control circuitry, it is powered by two 24V DC power supplies ( Figure 1 , Figure 2 The on / off control (as shown in point 5) enables friction testing and characteristic testing, unifying the previously unrelated friction testing and characteristic testing (mutual control mode).

[0031] When conducting the switch machine characteristic test, the electromagnetic control of the two normally open bidirectional shut-off cartridge valve 5 in the hydraulic friction functional valve block assembly (composed of oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5) is in the de-energized mode. Its oil circuit allows bidirectional flow of oil between the oil circuit transition plate 4 and the hydraulic cylinder 2 in the hydraulic friction functional valve block assembly (composed of oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5). The characteristic test is carried out in accordance with the control circuit and program and the direction of movement of the switch machine.

[0032] During the friction test, the hydraulic system stops working, and only the 24V DC power supply controlling the normally open bidirectional shut-off cartridge valve 5 is turned on. The valve core of the cartridge valve moves, closing the inlet and outlet ports, thus cutting off the oil flow between the oil circuit transition plate 4 and the hydraulic cylinder 2, locking the hydraulic cylinder 2, and rigidly sealing the switch machine. The switch machine operates in both pushing and pulling directions for a specified time, and the test bench automatically collects relevant data from the friction test. In different test modes, the interface (i.e., the pin) between the switch machine and the hydraulic load does not need to be disassembled, simplifying the test procedure. The mechanical closing characteristic of the cartridge valve improves the reliability and lifespan of the test bench.

[0033] The hydraulic cartridge valve selected in this invention is a hydraulic seat valve. The oil circuit transition plate 4 of the hydraulic system used for testing does not need to be re-processed. It is only necessary to assemble the valve block with the hydraulic cartridge valve installed into the existing hydraulic system to realize the function of locking the oil cylinder.

[0034] It can retain the mechanical friction test method for switch machines, ensuring that the inspection and testing process of switch machines meets the standard requirements; at the same time, it can meet the user's demand for automated testing by adding a hydraulically controlled switch machine friction test method that does not interfere with the mechanical friction test method, thereby improving the testing efficiency.

[0035] like Figure 4 As shown, the method for friction testing of hydraulically controlled switch machines includes automatic testing and manual inspection. During automatic testing, the friction characteristic test command is entered by clicking on the interface.

[0036] After the command is entered, the test bench automatically collects relevant data from the friction test, including: friction load test, forward friction stability test, and reverse friction stability test. The data from the friction load test, forward friction stability test, and reverse friction stability test are recorded in a spreadsheet.

[0037] Manual testing can be performed by clicking the action button to test the friction load, forward friction stability, and reverse friction stability. The values ​​of forward and reverse friction will be displayed on the digital display of the control panel.

[0038] When automatically performing friction load test, forward friction stability test, and reverse friction stability test, the above test data are compared and judged. If the test fails, the friction force of the switch machine is adjusted and the test is repeated until the test is qualified.

[0039] This invention can achieve friction at any position during the operation of the switch machine, which is more flexible than the traditional test bench that blocks the switch machine at a fixed position.

[0040] By adding a hydraulic friction function valve block assembly (composed of an oil circuit transition plate 4 and two normally open bidirectional shut-off cartridge valves 5), the control function of the hydraulic oil circuit is simplified, which is beneficial to improving the overall service life of the hydraulic system, and also facilitates troubleshooting and improves the efficiency of maintenance.

[0041] The specific implementation of this invention is not limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this invention, and all such modifications and substitutions should be considered within the scope of protection of this invention.

Claims

1. A method for testing the friction of a hydraulically controlled switch machine, comprising: The hydraulic cylinder (2) and the hydraulic friction function valve block group are composed of an oil circuit transition plate (4) and two normally open bidirectional shut-off cartridge valves (5). The hydraulic friction function valve block group is characterized by connecting the hydraulic cylinder (2) and the hydraulic main oil circuit system (6); the oil circuit channel interface (8) of the hydraulic friction function valve block group is matched with the oil port of the hydraulic cylinder (2) and the hydraulic main oil circuit system (6); when the switch machine under test is installed on the test bench, the hydraulic piston rod of the hydraulic cylinder (2) and the switch machine action rod are connected through the joint to complete the friction test and characteristic test of the switch machine. It does not require additional pins to fix the original friction test insertion hole (3) on the test bench for the switch machine friction test; the friction test of the switch machine includes the following process: the 24V DC power supply of the hydraulic cylinder (2) and the left and right normally open bidirectional shut-off cartridge valves (5) is turned on by the control circuit to make them energized and shut off, thereby making them energized and shut off. The flow of oil between the oil circuit transition plate (4) and the hydraulic cylinder (2) in the hydraulic friction function valve block group is cut off, so that the hydraulic cylinder (2) is locked and the switch machine is rigidly blocked. During the push and pull movements of the switch machine, the test bench automatically collects relevant data of the friction test, judges whether the test data is qualified, records the test table, and completes the friction test. The switch machine characteristic test includes the following process: the hydraulic friction function valve block group connected to the switch machine is not working, the motor is controlled to run, the hydraulic oil sent by the oil pump motor and the oil tank group (1) can flow smoothly between the hydraulic main oil circuit system (6) and the hydraulic cylinder (2), the switch machine drives the hydraulic load to pull in and out normally, and reciprocates 3 to 5 times. During this period, the test bench automatically collects relevant data of the switch machine, judges whether the test data is qualified, records the test table, and completes the switch machine characteristic test. If all test results are qualified, the switch machine inspection is completed; otherwise, it is repaired and returned.

2. The method for friction testing of a hydraulically controlled switch machine according to claim 1, characterized in that: A hydraulic friction function valve block assembly is connected between the hydraulic cylinder (2) and the hydraulic main oil circuit system (6). The hydraulic friction function valve block assembly includes an oil circuit transition plate (4) and a two normally open bidirectional shut-off cartridge valve (5). The hydraulic friction function valve block assembly is installed in a pipeline and is connected through an oil circuit channel interface (8).

3. The method for friction testing of a hydraulically controlled switch machine according to claim 1, characterized in that: When conducting the switch machine characteristic test, the electromagnetic control of the two normally open bidirectional shut-off cartridge valves (5) in the hydraulic friction function valve block group is in the power-off mode, and its oil circuit allows the oil to flow bidirectionally between the oil circuit transition plate (4) and the hydraulic cylinder (2).

4. The method for friction testing of a hydraulically controlled switch machine according to claim 1, characterized in that: When the friction test is performed, the hydraulic system stops working. Only the 24V DC power supply controlling the normally open bidirectional shut-off cartridge valve (5) is turned on. The valve core of the cartridge valve moves and closes the inlet and outlet oil ports, so that the oil flow between the oil circuit transition plate (4) and the hydraulic cylinder (2) is cut off, thereby locking the hydraulic cylinder (2) and rigidly blocking the switch machine.

5. The method for friction testing of a hydraulically controlled switch machine according to claim 1, characterized in that: The friction test and characteristic test of the switch machine include automatic testing and manual detection. During automatic testing, the friction characteristic test command is entered through the interface. After the command is entered, the test bench automatically collects relevant data, including friction load test, forward friction stability test, and reverse friction stability test. The data for these tests are recorded in a spreadsheet. Manual detection involves clicking action buttons to perform the friction load test, forward friction stability test, and reverse friction stability test, respectively. The values ​​for these tests are displayed on the digital display of the control panel.

6. The method for friction testing of a hydraulically controlled switch machine according to claim 5, characterized in that: When automatically performing friction load tests, forward friction stability tests, and reverse friction stability tests, the above test data are compared and judged. If the data is not qualified, the friction force of the switch machine is adjusted and the test is repeated until the test is qualified.

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