A method and device for testing air chamber bracket of mining vehicle

Abstract

The invention relates to a method for testing an air chamber support of a mining vehicle, which is characterized by comprising a tooling fixture and a test floor, wherein the tooling fixture comprises a reaction seat, a gantry frame, a mounting base plate, a hydraulic actuator, a spoke-type force sensor and a LVDT displacement sensor, wherein the reaction seat, the gantry frame and the mounting base plate are respectively mounted on the test floor, a suspension spring is arranged on the gantry frame, and the hydraulic actuator is arranged on the suspension spring; during the test, one end of the air chamber support is arranged on the mounting base plate, the other end of the air chamber support is connected to the hydraulic actuator, and the other end of the hydraulic actuator is connected to the reaction seat, the spoke-type force sensor is arranged on one end of the hydraulic actuator connected to the air chamber support, and the LVDT displacement sensor is arranged on one end of the hydraulic actuator connected to the reaction seat; the hydraulic actuator and the spoke-type force sensor are respectively connected to a PLC, and fatigue detection of different air chamber supports can be performed by starting the hydraulic actuator through the PLC, and relevant data can be collected.

Description

Technical Field

[0001] The invention relates to a vehicle air chamber bracket testing device, in particular to a mining vehicle air chamber bracket testing device and method. Background Art

[0002] Most mining vehicles, buses, medium and heavy trucks use pneumatic brake systems. The pneumatic brake system is the earliest power brake system in development. Its energy supply device and transmission device are both pneumatic. Among them, the transmission system is composed of pneumatic control parts such as brake pedals and pneumatic brake valves.

[0003] According to the structure, the pneumatic brake system can be divided into four parts: energy supply device, control device, transmission device, and brake. The energy supply device is responsible for generating the energy required for braking. The engine of the mining vehicle drives the air compressor, making it an energy supply device that provides the air source. The control device is the handbrake, pneumatic brake valve, relay valve, etc., which are used to generate braking action and control the braking effect of the vehicle. The transmission device is a transmission mechanism, and its function is to connect and transmit the braking air pressure power generated by the energy supply device to the vehicle's braking equipment-brake, so as to brake the vehicle. The brake chamber of a mining vehicle is an extremely important component of the transmission device. It is a key component responsible for converting air pressure and brake cam into mechanical force. The brake chamber of a mining vehicle is installed and fixed at the front end of the chamber bracket. Both the driving brake and the parking brake will cause the push rod of the brake chamber of the mining vehicle to push the brake adjustment arm to rotate and brake. During the braking process, the chamber bracket of the mining vehicle will also be subjected to the reaction force of the chamber when the chamber is actuated. In this way, the mining vehicle needs to brake frequently under poor working conditions. At this time, if the strength of the brake chamber bracket is insufficient, the bracket may be broken in serious cases, causing brake failure, seriously affecting the safety of vehicle driving, and is a major hidden danger to life safety and property. The main function of the brake part is to slow down, stop and keep the wheels of the vehicle stopped.

[0004] At present, there is no specific test method to test the air chamber bracket of mining vehicles. It is only through simulation on the computer that some data can be obtained, so it is difficult to conduct relevant tests. It is also difficult for dealers and manufacturers to obtain practical test data, or to set parameters for sampling tests on products. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for testing an air chamber bracket of a mining vehicle.

[0006] The technical solution to solve the above technical problems is: a method for testing an air chamber bracket of a mining vehicle, comprising a fixture and a test floor, the fixture comprising a reaction seat, a gantry frame, a mounting base plate, a hydraulic actuator, a spoke-type force sensor and a LVDT displacement sensor, the reaction seat, the gantry frame and the mounting base plate are respectively installed on the test floor, a suspension spring is provided on the gantry frame, and the hydraulic actuator is arranged on the suspension spring, during the test, one end of the air chamber bracket is arranged on the mounting base plate, the other end of the air chamber bracket is connected to the hydraulic actuator, and the other end of the hydraulic actuator is connected to the reaction seat, the spoke-type force sensor is arranged on one end where the hydraulic actuator is connected to the air chamber bracket, and the LVDT displacement sensor is arranged on one end where the hydraulic actuator is connected to the reaction seat; the hydraulic actuator and the spoke-type force sensor are respectively connected to a PLC, the hydraulic actuator is started by the PLC to test the air chamber bracket, and the data of the spoke-type force sensor is collected.

[0007] A further technical solution of the present invention is: a plurality of bolt mounting holes are respectively provided on the test floor and the reaction seat, a plurality of bolt mounting holes are provided on the bottom and mounting surface of the reaction seat, the reaction seat is fixed on the test floor by bolts, and the hydraulic actuator is connected to the reaction seat by a mounting plate at the rear end of the actuator. A lifting eye screw is provided on the top beam of the gantry frame through a threaded hole, and a lifting spring is provided at the lower end of the lifting eye screw.

[0008] A method for testing a gas chamber support for a mining vehicle, comprising the following test steps: S01. installing and fastening a gas chamber support to be tested on a test floor by means of a fixture, and adjusting the horizontal height of an actuator according to the height of a flange fixture of the gas chamber support to achieve a correct load loading direction for the gas chamber support;

[0009] S02. Manually operate the PLC touch screen to adjust the extension and retraction of the actuator cylinder piston rod, so that the ball joint seat at the end of the actuator piston rod and the flange tooling can be pre-tightened and installed by bolts;

[0010] S03. Operate the PLC touch screen to set the sinusoidal vibration parameters for the test. The maximum loading force of the sinusoidal curve is the maximum thrust value of the brake air chamber used with the test piece, and the minimum value is 0.1 times the load;

[0011] S04. After the test starts, the hydraulic actuator is controlled to perform sinusoidal vibration loading on the test piece according to the test parameters set by the PLC and the data collected and fed back in the real-time test;

[0012] S05. The real-time test data of the test piece on the test bench is displayed on the PLC touch screen, and the relevant displacement and loading force data are stored and recorded after the experiment, so as to facilitate the query and export of the test data.

[0013] Due to the adoption of the above technical solution, a method for testing the air chamber bracket of a mining vehicle of the present invention has the following beneficial effects:

[0014] The test device of the present invention has a simple structure and can be installed and adapted to different types of air chamber brackets. The test method has high precision, low cost, and high safety. It can perform fatigue detection on the air chamber bracket of a mining vehicle to obtain the results of whether the working time and other parameters are reached, which solves the problem that it is difficult to find the causes of various problems that occur after the sale of the air chamber bracket of the mining vehicle. The present invention can carry out relevant tests during the development of the air chamber bracket of the mining vehicle, which solves the problem that the air chamber bracket of the mining vehicle needs to brake frequently under poor working conditions. At this time, if the strength of the brake air chamber bracket is insufficient, the bracket may be broken in severe cases, causing brake failure, which seriously affects the safety of vehicle driving. The present invention is simple to use and install, and improves the safety, reliability and stability of production. It reduces the labor intensity of workers and has excellent ergonomics. Because of its low cost and high return, it has broad market prospects. The cost of this product is limited to less than 30,000 yuan, which is far lower than similar products on the market. It has a very high cost performance and significant economic benefits.

[0015] Next, the technical features of a method for testing an air chamber bracket for a mining vehicle of the present invention will be further described in conjunction with the accompanying drawings and specific embodiments of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : A structural schematic diagram of a mining vehicle air chamber bracket testing device.

[0017] Figure 2 : A structural schematic diagram of a mining vehicle air chamber bracket testing device.

[0018] Figure 3 : Schematic diagram of the structure of the tooling fixture.

[0019] In the above drawings, the descriptions of the reference numerals are as follows:

[0020] 1-reaction seat, 2-actuator rear end mounting plate, 3-rear joint seat, 4-LVDT displacement sensor, 5-rear end lifting ring, 6-hydraulic actuator, 7-gantry frame, 8-adjusting nut set, 9-lifting eye screw, 10-suspension spring, 11-spoke force sensor, 12-M24 spring washer set, 13-M24 screw, 14-test floor, 15-mounting base plate, 16-mounting block, 17-mining vehicle air chamber bracket, 18-connecting flange, 19-front joint seat, 20-connecting bolts and spiral washers, 21-G761 electro-hydraulic servo valve, 22-M24 gasket set, 23-M24 bolts. DETAILED DESCRIPTION

[0021] A method for testing an air chamber support of a mining vehicle comprises a tooling fixture and a test floor 14. The tooling fixture is installed on the test floor. The tooling fixture comprises a reaction seat 1, a gantry frame 7, a mounting base plate 15, a hydraulic actuator 6, a spoke-type force sensor 11 and a LVDT displacement sensor 4. The reaction seat, the gantry frame and the mounting base plate are respectively installed on the test floor. A suspension spring is provided on the gantry frame. The hydraulic actuator is arranged on the suspension spring. During the test, one end of the air chamber support is arranged on the mounting base plate, the other end of the air chamber support is connected to the hydraulic actuator, and the other end of the hydraulic actuator is connected to the reaction seat. The spoke-type force sensor is arranged on one end of the hydraulic actuator connected to the air chamber support, and the LVDT displacement sensor is arranged on one end of the hydraulic actuator connected to the reaction seat. The hydraulic actuator and the spoke-type force sensor are respectively connected to a PLC. The hydraulic actuator is started by the PLC to test the air chamber support, and data of the spoke-type force sensor are collected. The test floor and the reaction seat are respectively provided with a plurality of bolt mounting holes, and the bottom and mounting surface of the reaction seat are both provided with a plurality of bolt mounting holes, that is, the test floor is provided with bolt mounting slots, and the bolt mounting slots are provided with a plurality of nuts matching the bolts. The reaction seat is positioned and fixed on the test floor by bolts, and the hydraulic actuator is connected to the reaction seat through the rear mounting plate of the actuator, that is, the mounting surface of the reaction seat is provided with a plurality of bolt through holes, and the rear mounting plate of the actuator is also provided with bolt through holes, and the rear mounting plate of the actuator is positioned and fixed on the mounting surface of the reaction seat by tightening the nuts on the bolts. The mounting bottom plate is provided with bolt through holes, and the mounting bottom plate is positioned and fixed on the test floor by bolts. The mounting positions of the reaction seat, the gantry frame and the mounting bottom plate on the test floor are adjusted to accommodate the installation of different air chamber brackets. The top beam of the gantry frame is provided with a lifting eye screw through a threaded hole, and a lifting spring is provided at the lower end of the lifting eye screw. The height of the lifting spring can be adjusted by rotating the lifting eye screw, thereby adjusting the height of the hydraulic actuator to accommodate the installation of different air chamber brackets. The hydraulic actuator is provided with an electro-hydraulic servo valve and a rear end lifting ring, the rear joint seat of the hydraulic actuator is connected to the rear end mounting plate of the actuator, the rear end mounting plate of the actuator is installed on the reaction seat, the front joint seat of the hydraulic actuator is connected to the connecting flange on the air chamber bracket, and the other end of the air chamber bracket is fixed to the mounting block of the mounting base.

[0022] Specific implementation: The test bench uses a programmable logic controller (PLC) as a control system. The control system of the test bench is composed of a host computer and a slave computer. The host computer touch screen is used to realize human-computer interaction, that is, to issue control commands and display various test signals or data. The slave computer PLC controls the servo valve and then controls the hydraulic actuator to achieve ideal sinusoidal loading, and realizes fatigue loading test of the air chamber bracket of the mining vehicle. The test bench is equipped with an alarm, timely shutdown and safety guarantee device if the test piece is damaged or the test device fails during the test.

[0023] (1) Air chamber bracket mounting block: To test the air chamber bracket, it is first necessary to make the air chamber mounting surface of the air chamber bracket perpendicular to the ground, that is, to connect it to the horizontally arranged actuator so that the loading force of the actuator can be perpendicular to the air chamber mounting surface of the air chamber bracket. This can correctly simulate the force line of the air chamber bracket. The air chamber bracket mounting block is designed based on the complementary angle between the bottom end face of the air chamber bracket and the air chamber mounting surface. Because the mounting block is adapted to other air chamber brackets, its inclined surface is processed with two groups of 7 M16 threaded holes in total; the bottom surface of the mounting block has 4 M18 threaded holes for installation with the base plate.

[0024] (2) Installation base plate: The installation base plate is responsible for fixing the air chamber bracket to the test ground. The bottom surface of the air chamber bracket mounting block is installed on it, and its ground is in contact with the test ground. It is fixed to the test ground by M24 bolts.

[0025] (3) Connection flange: The air chamber mounting surface of the air chamber bracket will be installed on one end of the connection flange through an M16 hexagon socket bolt, and the other end will be connected to the front joint seat of the hydraulic actuator. The installation diagram of the joint seat is shown in the attached figure. The design can be made based on the air chamber mounting hole spacing and hole diameter of this air chamber bracket. The connection flange in this design is adapted to the mounting hole positions of all air chamber brackets that need to be tested, saving cost and materials.

[0026] The test method process specifically includes the following steps:

[0027] S01. Install and fasten the air chamber bracket to be tested on the test ground through the fixture, and then adjust the horizontal height of the actuator in the test bench according to the height of the flange fixture of the air chamber bracket at this time to achieve the correct load loading direction of the air chamber bracket;

[0028] S02. Manually operate the upper computer touch screen to adjust the extension and retraction of the actuator cylinder piston rod, so that the ball joint seat at the end of the actuator piston rod and the flange tooling can be pre-tightened and installed by bolts;

[0029] S03. Operate the upper computer touch screen to set the sinusoidal vibration parameters for the test. The maximum loading force of the sinusoidal curve is the maximum thrust value of the brake air chamber used with the test piece, and the minimum value is 0.1 times the load;

[0030] S04. After the test starts, the lower computer PLC obtains the test parameters set by the upper computer, and then controls the test bench electro-hydraulic servo loading system to perform sinusoidal vibration loading on the test piece through the data collected and fed back in the real-time test;

[0031] S05. The lower computer communicates with the upper computer, and the real-time test data of the test bench on the test piece is displayed on the upper computer touch screen. After the experiment, the displacement and loading force data related to the test bench test are stored and recorded to facilitate the query and export of the test data.

Claims

1. A method for testing an air chamber bracket of a mining vehicle, characterized in that: It includes a tooling fixture and a test floor. The tooling fixture includes a reaction seat, a gantry frame, a mounting base plate, a hydraulic actuator, a spoke-type force sensor and a LVDT displacement sensor. The reaction seat, the gantry frame and the mounting base plate are respectively installed on the test floor. The gantry frame is provided with a suspension spring, and the hydraulic actuator is arranged on the suspension spring. During the test, one end of the air chamber bracket is arranged on the mounting base plate, and the other end of the air chamber bracket is connected to the hydraulic actuator, and the other end of the hydraulic actuator is connected to the reaction seat. The spoke-type force sensor is arranged on one end of the hydraulic actuator connected to the air chamber bracket, and the LVDT displacement sensor is arranged on one end of the hydraulic actuator connected to the reaction seat; the hydraulic actuator and the spoke-type force sensor are respectively connected to the PLC, and the hydraulic actuator is started by the PLC to test the air chamber bracket, and the data of the spoke-type force sensor are collected.

2. A method for testing an air chamber bracket for a mining vehicle according to claim 1, characterized in that: The test floor and the reaction seat are respectively provided with a plurality of bolt mounting holes, the bottom and mounting surface of the reaction seat are both provided with a plurality of bolt mounting holes, the reaction seat is positioned and fixed on the test floor by bolts, and the hydraulic actuator is connected to the reaction seat by a mounting plate at the rear end of the actuator.

3. A method for testing an air chamber support for a mining vehicle according to claim 1, characterized in that: The top beam of the gantry frame is provided with a lifting eye screw through a threaded hole, and a lifting spring is arranged at the lower end of the lifting eye screw.

4. A method for testing an air chamber support for a mining vehicle according to claim 1, characterized in that: The test steps include: S01. Install and fasten the air chamber bracket to be tested on the test floor through a fixture, and adjust the horizontal height of the actuator according to the height of the flange fixture of the air chamber bracket to achieve the correct load loading direction of the air chamber bracket; S02. Manually operate the PLC touch screen to adjust the extension and retraction of the actuator cylinder piston rod, so that the ball joint seat at the end of the actuator piston rod and the flange tooling can be pre-tightened and installed by bolts; S03. Operate the PLC touch screen to set the sinusoidal vibration parameters for the test. The maximum loading force of the sinusoidal curve is the maximum thrust value of the brake air chamber used with the test piece, and the minimum value is 0.1 times the load; S04. After the test starts, the hydraulic actuator is controlled to perform sinusoidal vibration loading on the test piece according to the test parameters set by the PLC and the data collected and fed back in the real-time test; S05. The real-time test data of the test piece on the test bench is displayed on the PLC touch screen, and the relevant displacement and loading force data are stored and recorded after the experiment, so as to facilitate the query and export of the test data.

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