Impact resistance test system and method for explosion-proof equipment detection test

Abstract

The invention belongs to the technical field of explosion-proof equipment inspection and detection, and particularly relates to an anti-impact test system and method for an explosion-proof equipment detection test, and the system comprises an impact test device, a temperature control test box, and a control system. The impact test device and the temperature control test box are electrically connected with the control system and are controlled by the control system; the control system comprises a control interface; the impact test device comprises an impact test box body and an impact module arranged in the impact test box body; a lifting platform is arranged in the impact test box body and ascends and descends through a ball screw structure arranged between a supporting plate and a top plate of the impact test box body; a displacement sensor is installed on the lower surface of the lifting platform and electrically connected with the control system. The displacement sensor measures the distance between the lifting platform and the test sample. The impact test device, the temperature control test box and the control system are arranged to control the impact test device, the temperature control test box and the control system, and high and low temperature impact integration and automation of the impact test are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof equipment inspection and testing, and specifically relates to an anti-impact test system and method for explosion-proof equipment inspection and testing. Background Art

[0002] There is a large amount of methane flammable gas underground in coal mines. When the methane content in the air reaches a certain concentration, it may explode when encountering a high temperature, large heat source or a spark with sufficient energy, leading to a mine accident. In order to avoid causing the combustion and explosion of flammable gases, electrical equipment used in explosive environments should adopt explosion-proof structures to ensure its safe use in certain explosive hazardous environments and the safety of explosive environments. Explosion-proof equipment must undergo rigorous explosion-proof tests to determine whether it can be used safely. Among them, the impact test is the most basic and important test to determine whether the casing of explosion-proof equipment is safe. Therefore, the test method of the impact test is clearly stated in 26.4.2 of GB / T 3836.1-2021 "Explosive Environments Part 1: General Requirements for Equipment". For test samples that require high and low temperature impact (such as those with adhesive explosion-proof surfaces and plastic shells), according to research, the existing impact test equipment can only complete the test manually at room temperature, that is, the impact hammer is lifted to the specified height by manually pulling the traction line, and then the test is carried out; when testing structures that require high and low temperature impact, the prototype must first be placed in a high-temperature box / refrigerator to heat up / cool down, and then taken out and placed in the impact equipment for impact. This method is time-consuming and labor-intensive and cannot guarantee the temperature of the sample during impact, and cannot complete an integrated test. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an anti-impact test system and method for explosion-proof equipment detection and testing, which can realize the integration and automation of high and low temperature impact of the impact test.

[0004] To achieve the above objectives, the following technologies are adopted:

[0005] An anti-impact test system for explosion-proof equipment detection and testing comprises an impact test device, a temperature control test box and a control system; the impact test device and the temperature control test box are both electrically connected to the control system and are controlled by the control system; the control system comprises a control interface.

[0006] Furthermore, the impact test device includes an impact test box and an impact module arranged in the impact test box; the impact test box has a built-in lifting platform, and the lifting platform rises and falls through a ball screw structure arranged between a support plate and a top plate of the impact test box; a level and a displacement sensor are installed on the lower surface of the lifting platform, and the displacement sensor is electrically connected to the control system; the displacement sensor measures the distance between the lifting platform and the test sample.

[0007] Furthermore, the impact module includes an electromagnetic suction device and a weight fixedly installed in the middle of the lower surface of the lifting platform. When the electromagnetic suction device is energized, the weight is adsorbed on the electromagnetic surface of the electromagnetic suction device. When the electromagnetic suction device is powered off, the weight falls from the electromagnetic surface of the electromagnetic suction device. The electromagnetic suction device is electrically connected to the control system, and the control system controls the power on and off of the electromagnetic surface of the electromagnetic suction device. A through hole is provided on the support plate at a position corresponding to the weight.

[0008] Furthermore, the temperature control test box is arranged at the lower end of the impact test box body, including a high temperature test box and a low temperature test box separated and arranged in parallel; a plurality of self-locking wheels are provided at the bottom of the temperature control test box for moving and locking the temperature control test box; the low temperature test box is refrigerated by using a refrigeration compressor, and the refrigeration compressor is electrically connected to the control system, and the operation of the refrigeration compressor is adjusted by the control system to complete the low temperature adjustment; a high temperature furnace is provided in the high temperature test box, and a heating device is arranged on the wall of the high temperature furnace for heating the high temperature test box, and the control system controls the heating current of the heating device to realize the heating of the high temperature test box; temperature sensors electrically connected to the control system are provided in the high temperature test box and the low temperature test box.

[0009] Furthermore, the heavy hammer includes a hammer head and a hammer handle, and the hammer head and the hammer handle are detachably connected.

[0010] An anti-impact test method using the above-mentioned anti-impact test system for explosion-proof equipment detection and testing comprises the following steps:

[0011] Step 1: Determine the impact energy, test temperature, impact height and weight according to the test requirements;

[0012] Step 2: Place the test sample into the corresponding temperature-controlled test box according to the test temperature, and move the corresponding temperature-controlled test box to the bottom of the support plate, so that the test sample in the temperature-controlled test box is placed under the through hole of the support plate and fixed; after the anti-impact test system is powered on, the electromagnetic surface of the electromagnetic suction device is powered on through the control system, and the heavy hammer is adsorbed on the electromagnetic surface of the electromagnetic suction device, and the impact height and test temperature to be tested are input in the control interface to start the test;

[0013] Step 3: The control system controls the lifting platform to rise, and the displacement sensor on the lifting platform measures the distance between the lifting platform and the test sample. At the same time, the control system controls the temperature control test box to work and heat up or cool down. When the lifting platform rises to the required impact height, the displacement sensor feeds back the signal to the control system, and the control system controls the ball screw structure to stop moving. When the temperature of the temperature control test box reaches the set value, the temperature sensor in the temperature control test box feeds back the signal to the control system, and the control system controls the temperature control test box to power off. After that, the control system controls the electromagnetic surface of the electromagnetic suction device to power off, and the heavy hammer falls to complete the impact test.

[0014] Step 4: After the test, take out the test sample, observe the impact part, and determine whether the test sample is qualified.

[0015] The beneficial effects of the present invention are:

[0016] The present invention realizes the integration and automation of high and low temperature impact of the impact test by arranging an impact test device and a temperature control test box and controlling them through a control system. By arranging an electromagnetic suction device on the lifting platform, the control system can be used to control the power on and off and the falling of the heavy hammer to perform an automated impact test. At the same time, the control system controls the temperature of the temperature control test box to simultaneously realize high and low temperature impact tests. The test method of the present invention saves time and effort, and there is no need to perform high temperature or low temperature treatment on the test sample separately. At the same time, it avoids the test result deviation that may occur when the test sample is subjected to temperature treatment and then subjected to the impact test, thereby improving the accuracy of the test result. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a work flow chart of the present invention;

[0018] Figure 2 It is a structural schematic diagram of an anti-impact test system for explosion-proof equipment detection and testing of the present invention (partially cut away);

[0019] Figure 3 It is a left-side structural schematic diagram of an anti-impact test system for explosion-proof equipment detection and testing of the present invention;

[0020] Figure 4 It is a schematic diagram of the enlarged structure of point A in the present invention;

[0021] In the figure, 1. lifting platform; 2. electromagnetic suction device; 3. hammer handle; 4. hammer head; 5. temperature control test box; 6. ball screw structure; 7. self-locking casters; 8. impact test device. DETAILED DESCRIPTION

[0022] In order to better explain the present invention and facilitate understanding, the technical solutions and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0023] like Figure 1-4As shown, this embodiment provides an impact test system for explosion-proof equipment detection and testing, including an impact test device 8, a temperature control test box 5 and a control system; the impact test device 8 and the temperature control test box 5 are electrically connected to the control system and controlled by the control system; the impact test device 8 is used to perform impact tests on explosion-proof equipment; the temperature control test box 5 is controlled by the control system to achieve high and low temperature control to meet the needs of different temperature impact tests; the control system includes a dedicated control interface designed for each operating parameter. In this embodiment, the control system is implemented using PLC.

[0024] The impact test device 8 includes an impact test box and an impact module arranged in the impact test box; the impact test box has a built-in lifting platform 1, and the lifting platform 1 is raised and lowered by a ball screw structure 6 arranged between the support plate and the top plate of the impact test box. The lifting platform 1 is used to install the impact module. In this embodiment, the lifting platform 1 is a triangular structure, which can make the platform structure more stable; the three corners of the lifting platform 1 are respectively driven to rise and fall by three existing ball screw structures 6; the ball screw structure 6 is driven by a motor electrically connected to the control system. In this embodiment, the motor is arranged on the top plate of the impact test box (not shown in the figure), and its output shaft is connected to the screw rod of the coupling ball screw structure. Then, the control system drives the lifting platform 1 to rise and fall by controlling the forward and reverse rotation of the motor; a level and a displacement sensor are installed on the lower surface of the lifting platform 1, and the displacement sensors are electrically connected to the control system; the height required for impact can be input into the control system, and the distance between the lifting platform 1 and the test sample is measured by the displacement sensor (the displacement sensor is reset to zero before the test begins, and the zero point is the length between the hammer head 4 and the hammer handle 3) as the impact height, and is fed back to the control system, thereby achieving precise control of the distance between the lifting platform 1 and the test sample and ensuring the accuracy of the impact height; the level is used to detect and display the inclination of the device, and the lifting platform 1 is adjusted to a horizontal state by observing the inclination of the level.

[0025] The impact module includes an electromagnetic suction device 2, a hammer handle 3, and a hammer head 4 fixedly installed in the middle of the lower surface of the lifting platform 1; the hammer head 4 is connected to the hammer handle 3 through a thread to form a heavy hammer, and the hammer handle 3 can be attached to the lower surface of the lifting platform 1 through the electromagnetic suction device 2. The electromagnetic suction device 2 is electrically connected to the control system. Before the test, the control system controls the electromagnetic surface of the electromagnetic suction device 2 to be energized to adsorb the hammer handle 3. During the test, the electromagnetic surface is de-energized, and the hammer handle 3 falls to complete the impact test; a through hole is provided on the support plate corresponding to the position of the hammer head 4, which is used for the hammer head 4 to pass through and the displacement sensor of the lifting platform 1 to measure the distance between the lifting platform 1 and the sample.

[0026] A temperature control test box 5 is provided at the lower end of the impact test box, including a high-temperature test box and a low-temperature test box separated and arranged in parallel, which can prevent the conversion of high temperature and low temperature from shortening the life of the temperature control box. The top of the test box has a round hole for the passage of a heavy hammer, and a box door for placing and taking out test samples. The test samples can be placed in the high-temperature test box or the low-temperature test box; during the test, the ball screw structure 6 under the temperature control test box 5 is used to switch between the boxes according to needs and the wheels can be locked to prevent the box from moving; self-locking universal wheels can also be used; in this embodiment, the low-temperature test box is cooled by using a refrigeration device, and the refrigeration device is electrically connected to the control system. In this embodiment, the refrigeration device is implemented by a refrigeration compressor, and the required low-temperature test temperature is input in the control interface, and the control system automatically adjusts The operation of the refrigeration compressor completes the low-temperature adjustment; a high-temperature furnace is provided in the high-temperature test chamber, and heating devices are arranged on the walls around the high-temperature furnace. The heating of the high-temperature test chamber is achieved by using the heating devices. The control system controls the heating current of the heating devices to achieve the heating of the high-temperature test chamber. The heating devices can be resistance wires, heating tubes, heating plates, etc., and this embodiment uses resistance wires to achieve this; the required high-temperature test temperature is input in the control interface, and the control system controls the heating wire to complete the high-temperature adjustment, and the temperature deviation is within ±1°C; a temperature sensor electrically connected to the control system is provided in the high-temperature test chamber and the low-temperature test chamber. When the temperature in the test chamber reaches the set temperature ±1°C, the temperature sensor sends a signal to the control system, the high and low temperature test chambers are powered off, and the electromagnetic suction is powered off at the same time, and the impact hammer falls to complete the impact test.

[0027] The longitudinal height of the impact test device 8 is 5.0m, and the lateral length is 5.0m, wherein the effective impact height is: 0-3000mm; the impact energy is 0-30J; according to Article 26.4.2 of GB / T 3836.1-2021, the hammer head 4 is designed to be hemispherical with a weight of 1kg and a diameter of (25±0.5)mm. In order to facilitate scientific research requirements, the hammer head 4 is designed to be detachable and can be replaced with a hammer head 4 of other sizes at any time.

[0028] Taking the explosion-proof temperature transmitter as an example, the test prototype has an explosion-proof mark of Ex dbⅡC T6 Gb, and its window glass is directly bonded to the flameproof shell to form a whole. The enterprise standard stipulates that the operating environment temperature of this product is -20℃~+40℃. According to GB / T3836-2021, Article 26.4.2, the impact energy is 4J, that is, the impact height is 0.4m. The impact test should be carried out according to the maximum and minimum operating temperatures. The test temperature should be: for the upper limit temperature, the maximum operating temperature is increased by 10K~15K; for the lower limit temperature, the minimum operating temperature is reduced by 5K~10K. This test prototype needs to be subjected to high temperature impact test and low temperature impact test respectively; the maximum temperature during the test is set to 53℃ and the minimum temperature is -27℃.

[0029] The test method of the present invention is as follows (the test prototype takes the above-mentioned explosion-proof temperature transmitter as an example):

[0030] First, the test prototype is subjected to a high temperature impact test, and the test method and process are as follows:

[0031] Step 1: According to the test requirements, the maximum temperature during the test is determined to be 53°C, the impact energy is 4J, that is, the impact height is 0.4m; the weight of the heavy hammer is 1kg, and the hammer head 4 is a hemispherical shape with a diameter of (25±0.5)mm;

[0032] Step 2: Place the test sample into the high-temperature test box according to the test temperature, and move the corresponding test box to the bottom of the support plate, so that the test sample in the test box is placed under the through hole of the support plate and the wheels are locked; the anti-impact test system is powered on, and the control system controls the electromagnetic suction device 2 to power the electromagnetic surface of the electromagnetic suction device 2, and the impact hammer is electromagnetically adsorbed on the lifting platform 1; input the impact height and test temperature to be tested in the control interface, and start the test;

[0033] Step 3: The control system controls the lifting platform 1 to rise, and the displacement sensor on the lifting platform 1 measures the distance between the lifting platform 1 and the test sample. At the same time, the control system controls the high-temperature test chamber to work and heat up; when the lifting platform 1 rises to the specified impact height ±0.1m, the displacement sensor feeds back the signal to the control system, and the control system controls the ball screw structure 6 to stop moving; when the test temperature reaches the set value, the temperature sensor in the test chamber feeds back the signal to the control system, and the control system controls the high-temperature test chamber to power off; then the control system controls the electromagnetic surface of the electromagnetic suction device 2 to power off, and the impact hammer falls to complete the impact test;

[0034] Step 4: After the test, take out the test sample and observe the impact part. According to Article 26.4.2 of GB / T 3836.1, if the damage caused by the impact test does not cause the explosion-proof performance to fail, the sample is qualified.

[0035] After completing the high-temperature impact test, perform a low-temperature impact test on the test sample using the same test method, and determine that the lowest temperature during the test is -27°C. Simply replace the high-temperature test chamber with a low-temperature test chamber.

Claims

1. An anti-impact test system for explosion-proof equipment detection and testing, characterized in that: It includes an impact test device, a temperature control test box and a control system; the impact test device and the temperature control test box are electrically connected to the control system and are controlled by the control system; the control system includes a control interface.

2. The anti-shock test system for explosion-proof equipment detection test according to claim 1 is characterized by: The impact test device includes an impact test box and an impact module arranged in the impact test box; the impact test box has a built-in lifting platform, and the lifting platform is raised and lowered by a ball screw structure arranged between a support plate and a top plate of the impact test box; a level and a displacement sensor are installed on the lower surface of the lifting platform, and the displacement sensor is electrically connected to the control system; the displacement sensor measures the distance between the lifting platform and the test sample.

3. The anti-shock test system for explosion-proof equipment detection test according to claim 2 is characterized by: The impact module includes an electromagnetic suction device and a weight fixedly installed in the middle of the lower surface of the lifting platform. When the electromagnetic suction device is powered on, the weight is adsorbed on the electromagnetic surface of the electromagnetic suction device. When the electromagnetic suction device is powered off, the weight falls from the electromagnetic surface of the electromagnetic suction device. The electromagnetic suction device is electrically connected to the control system, and the control system controls the power on and off of the electromagnetic surface of the electromagnetic suction device. A through hole is provided on the support plate at a position corresponding to the weight.

4. The impact resistance test system for explosion-proof equipment detection and testing according to claim 1 is characterized in that: The temperature control test box is arranged at the lower end of the impact test box body, and includes a high temperature test box and a low temperature test box that are separated and arranged in parallel; a plurality of self-locking wheels are provided at the bottom of the temperature control test box for moving and locking the temperature control test box; the low temperature test box is cooled by using a refrigeration device, the refrigeration device is electrically connected to the control system, and the operation of the refrigeration device is adjusted by the control system to complete the low temperature adjustment; a high temperature furnace is provided in the high temperature test box, and a heating device is arranged on the furnace wall of the high temperature furnace for heating the high temperature test box, and the control system controls the heating current of the heating device to realize the heating of the high temperature test box; temperature sensors electrically connected to the control system are provided in the high temperature test box and the low temperature test box.

5. The anti-shock test system for explosion-proof equipment detection and testing according to claim 1 is characterized by: The heavy hammer comprises a hammer head and a hammer handle, and the hammer head and the hammer handle are detachably connected.

6. An anti-impact test method using the anti-impact test system for explosion-proof equipment detection and testing as claimed in claim 1, characterized in that: Step 1: Determine the impact energy, test temperature, impact height and weight according to the test requirements; Step 2: Place the test sample into the corresponding temperature-controlled test box according to the test temperature, and move the corresponding temperature-controlled test box to the bottom of the support plate, so that the test sample in the temperature-controlled test box is placed under the through hole of the support plate and fixed; after the anti-impact test system is powered on, the electromagnetic surface of the electromagnetic suction device is powered on through the control system, and the heavy hammer is adsorbed on the electromagnetic surface of the electromagnetic suction device, and the impact height and test temperature to be tested are input in the control interface to start the test; Step 3: The control system controls the lifting platform to rise, and the displacement sensor on the lifting platform measures the distance between the lifting platform and the test sample. At the same time, the control system controls the temperature control test box to work and heat up or cool down. When the lifting platform rises to the required impact height, the displacement sensor feeds back the signal to the control system, and the control system controls the ball screw structure to stop moving. When the temperature of the temperature control test box reaches the set value, the temperature sensor in the temperature control test box feeds back the signal to the control system, and the control system controls the temperature control test box to power off. After that, the control system controls the electromagnetic surface of the electromagnetic suction device to power off, and the heavy hammer falls to complete the impact test. Step 4: After the test, take out the test sample, observe the impact part, and determine whether the test sample is qualified.

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