Testing device for mining explosion-proof combination switch

Abstract

The utility model relates to the technical field of combination switches, and discloses a testing device for a mining explosion-proof combination switch, which comprises a testing box, a box door arranged at the front end of the testing box, an objective table arranged in the testing box, an air cylinder arranged at the top in the testing box, a pressing plate arranged at the output end of the air cylinder, a cylinder arranged at one side of the testing box, and a cylinder cover arranged at the top of the cylinder. A ventilation pipe is fixedly connected to the top of the partition plate; a vertical pipe is movably arranged below the partition plate; a round box is fixedly connected to the top of the vertical pipe; a plurality of through holes are formed in the bottom surface of the round box; an exhaust pipe is fixedly connected to the side, away from the cylinder, of the test box. According to the utility model, the working states of the explosion-proof combination switch under different concentrations of gas and pulverized coal can be tested, and the accuracy of a test result is improved; and the compressive strength of the explosion-proof combination switch can be tested, and the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of combined switch technology, specifically a testing device for explosion-proof combined switches used in mining. Background Technology

[0002] A coal mine combination switch is a comprehensive switching device used for controlling electrical equipment in underground coal mines. It integrates multiple functions to control and protect various electrical equipment used in underground coal mines, such as coal mining machines, conveyors, fans, and lighting systems. Explosion-proof combination switches, as a type of coal mine combination switch, are electrical switching devices specifically designed for the flammable and explosive environments of underground coal mines. They possess explosion-proof capabilities, preventing the propagation of internal explosion flames and heat to the external explosive environment in the event of an external explosion, thereby avoiding a larger-scale explosion. Explosion-proof combination switches are an indispensable part of coal mine safety systems.

[0003] After the development of explosion-proof combination switches is completed, in addition to testing their explosion-proof performance, it is usually necessary to conduct working performance tests on the explosion-proof combination switches in a simulated mine environment; and in order to verify the structural integrity and safety of their explosion-proof enclosure in the face of internal explosion, it is also necessary to conduct pressure resistance tests on the explosion-proof combination switches.

[0004] In the prior art, utility model patent CN217359990U discloses a testing device for explosion-proof combination switches in mines, including a base plate, a rubber insulating plate, and a power socket. The rubber insulating plate is fixedly installed at the center of the top surface of the base plate. A sealing rubber gasket is provided at the bottom of the inner side of the positioning groove. An adding funnel is fixedly installed on the top of the sealed box, and the bottom end of the adding funnel is welded and fixed to the top end of a vertical pipe. The bottom end of the vertical pipe is fitted with a feeding control mechanism, which is mounted on a top rotating shaft. The top rotating shaft is mounted on the top surface of the inner wall of the sealed box via a bearing seat. An airflow fan is fixedly installed at the bottom end of the top rotating shaft, and an air inlet pipe is fixedly installed through the top of the side wall of the sealed box. This testing device for explosion-proof combination switches in mines adopts a novel structural design, which can simulate the dusty environment in a mine, test whether the explosion-proof combination switch can work normally in a complex underground environment, and allow for direct observation of the explosion-proof combination switch's condition during testing.

[0005] However, in actual coal mines, methane is a common flammable and explosive harmful gas. Methane and coal dust are also prevalent in the mine, which can affect the operation of explosion-proof combination switches. This device cannot test the performance of explosion-proof combination switches in the presence of methane, resulting in inaccurate test results. Furthermore, this device itself cannot perform pressure resistance testing on explosion-proof combination switches, requiring a separate pressure resistance testing device. Improvements are urgently needed. Utility Model Content

[0006] The technical problem this invention aims to solve is that existing testing devices for explosion-proof combination switches cannot test the working performance of explosion-proof combination switches in the presence of gas, resulting in inaccurate test results; furthermore, existing testing devices themselves cannot perform pressure resistance tests on explosion-proof combination switches.

[0007] To solve the above problems, the technical solution of this utility model is as follows: a testing device for explosion-proof combination switches in mines, including a test box, a door at the front end of the test box, a platform inside, a cylinder installed on the top of the test box above the platform, a pressure plate installed at the output end of the cylinder, a cylinder on one side of the test box, a cylinder cover at the top of the cylinder, a feed hopper connected to the front end, an air inlet pipe and an air outlet pipe symmetrically fixed to the upper parts of both sides, a partition fixed to the upper part inside, a ventilation pipe fixed to the top of the partition, a vertical pipe movably arranged below the partition inside the cylinder and penetrating the bottom surface of the cylinder, a circular box fixed to the top of the vertical pipe, multiple through holes opened on the bottom surface of the circular box, a conduit extending into the test box connected to the end of the air outlet pipe, and an exhaust pipe fixed to the side of the test box away from the cylinder.

[0008] Furthermore, the door is provided with an observation window, and a control panel is provided below the observation window.

[0009] Furthermore, the test box has multiple wire holes at its rear end, and a sealing plug is inserted into the inside of each wire hole.

[0010] Furthermore, the top surface of the platform is provided with a mounting groove, and a pressure sensor is installed in the mounting groove.

[0011] Furthermore, the connection points of the air inlet pipe and the air outlet pipe with the cylinder are located above the partition plate. Both the air inlet pipe and the ventilation pipe are equipped with one-way valves, and solenoid valves are also installed on the air inlet pipe and the exhaust pipe.

[0012] Furthermore, the top of the feed hopper is provided with a top cover, and the connection between the feed hopper and the cylinder is located below the partition plate.

[0013] Furthermore, a limiting cylinder is fixedly connected to the bottom of the cylinder and sleeved on the outside of the vertical tube, and a sealing ring is provided on the inner side of the limiting cylinder.

[0014] Furthermore, the top of the feed hopper is provided with a top cover, and the connection between the feed hopper and the cylinder is located below the partition plate.

[0015] Furthermore, the end of the exhaust pipe is connected to a collection box via a connecting pipe. The top of the collection box has a ventilation hole, and the front end has a discharge port. A filter screen is installed inside the ventilation hole, and a sealing cover is provided at the discharge port.

[0016] Furthermore, a gas sensor and a dust concentration sensor are installed inside the test chamber.

[0017] The advantages of this invention compared to existing technologies are as follows: Opening the solenoid valve on the air inlet pipe allows for the introduction of methane gas into the test chamber. Activating the variable frequency fan allows coal dust to enter the test chamber along with the airflow, enabling the testing of the explosion-proof combination switch's operating status under different methane and coal dust concentrations, thus improving the accuracy of the test results. The cylinder extension causes the pressure plate to move downwards, compressing the explosion-proof combination switch and enabling the testing of its compressive strength. This invention can test the operating status of the explosion-proof combination switch under different methane and coal dust concentrations, improving the accuracy of the test results; and it can also test the compressive strength of the explosion-proof combination switch, enhancing the practicality of the device. Attached Figure Description

[0018] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 .

[0019] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 .

[0020] Figure 3 This is a cross-sectional view of the test box of this utility model.

[0021] Figure 4 This is a cross-sectional view of the cylinder of this utility model.

[0022] As shown in the figure: 1. Test chamber; 2. Chamber door; 3. Platform; 4. Cylinder; 5. Pressure plate; 6. Cylinder; 7. Cylinder cover; 8. Feed hopper; 9. Air inlet pipe; 10. Air outlet pipe; 11. Partition plate; 12. Ventilation pipe; 13. Vertical pipe; 14. Round box; 15. Guide pipe; 16. Exhaust pipe; 17. Observation window; 18. Control panel; 19. Sealing plug; 20. Top cover; 21. Limiting cylinder; 22. Connecting pipe; 23. Collection box; 24. Filter screen; 25. Sealing cover. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 3As shown, a testing device for explosion-proof combination switches used in mining includes a test box 1. The front end of the test box 1 is provided with a door 2, and the door 2 is provided with an observation window 17. Below the observation window 17 is a control panel 18. The rear end of the test box 1 is provided with multiple wire holes, and sealing plugs 19 are inserted into the inside of the wire holes. The test box 1 is provided with a platform 3. The top surface of the platform 3 is provided with an installation groove, and a pressure sensor is installed in the installation groove. A cylinder 4 is installed on the top of the test box 1 above the platform 3, and a pressure plate 5 is installed at the output end of the cylinder 4.

[0025] The explosion-proof combination switch is placed above the platform 3. The cylinder 4 extends, causing the pressure plate 5 to move downwards and compress the explosion-proof combination switch, thus enabling the testing of its compressive strength. When wiring the explosion-proof combination switch, the sealing plug 19 is removed, and the cable connector of the explosion-proof combination switch is passed through the through hole and extended to the outside of the test chamber 1 for wiring. Then, putty can be used to seal the through hole to improve the sealing performance of the test chamber 1.

[0026] like Figure 1 and Figure 4 As shown, a cylinder 6 is provided on one side of the test chamber 1, with a cylinder cover 7 on the top of the cylinder 6. A feed hopper 8 is connected to the front end. An air inlet pipe 9 and an air outlet pipe 10 are symmetrically fixed to the upper parts of both sides. A partition 11 is fixed to the upper part of the inner side. The connection between the air inlet pipe 9 and the air outlet pipe 10 and the cylinder 6 is located above the partition 11. A top cover 20 is provided on the top of the feed hopper 8, and the connection between the feed hopper 8 and the cylinder 6 is located below the partition 11. A ventilation pipe 12 is fixed to the top of the partition 11. A one-way valve is installed on both the air inlet pipe 9 and the ventilation pipe 12. The inside of the cylinder 6 is connected to the partition 1. A vertical pipe 13 is provided below the bottom of the cylinder 6, and a circular box 14 is fixed to the top of the vertical pipe 13. Multiple through holes are opened on the bottom surface of the circular box 14. The end of the exhaust pipe 10 is connected to a conduit 15 extending into the interior of the test chamber 1. An exhaust pipe 16 is fixed to the side of the test chamber 1 away from the cylinder 6. Solenoid valves are also installed on the intake pipe 9 and the exhaust pipe 16. A limiting cylinder 21 is fixed to the bottom of the cylinder 6 and sleeved on the outside of the vertical pipe 13. A sealing ring is provided on the inner side of the limiting cylinder 21. A gas sensor and a dust concentration sensor are installed inside the test chamber 1.

[0027] Connect the air inlet pipe 9 to the gas source and the vertical pipe 13 to the variable frequency fan. Add an appropriate amount of pulverized coal into the cylinder 6 through the feed hopper 8 and cover it with the top cover 20. Open the solenoid valve on the air inlet pipe 9 to input gas into the test chamber 1. When the variable frequency fan is turned on, the airflow generated by the variable frequency fan is transported to the cylindrical box 14 through the vertical pipe 13, and then blown onto the pulverized coal through the through hole, so that the pulverized coal follows the airflow through the ventilation pipe 12, the exhaust pipe 10 and the conduit 15 into the interior of the test chamber 1. When inputting pulverized coal, the operator can slowly pull down the vertical pipe 13 to avoid insufficient pulverized coal input due to excessive gap between the cylindrical box 14 and the pulverized coal.

[0028] For example Figure 1As shown, the end of the exhaust pipe 16 is connected to a collection box 23 via a connecting pipe 22. The top of the collection box 23 has a ventilation hole, and the front end has a discharge port. A filter screen 24 is installed inside the ventilation hole, and a sealing cover 25 is provided at the discharge port.

[0029] When gas and coal dust are introduced into the test chamber 1, the solenoid valve on the exhaust pipe 16 is opened and adjusted to prevent excessive pressure inside the test chamber 1 and to ensure that the concentration of gas and coal dust inside the test chamber 1 is balanced. After the coal dust enters the collection box 23, it will be intercepted inside the collection box 23 by the filter screen 24, which can prevent the coal dust from drifting into the air.

[0030] In practical use, opening the solenoid valve on the air inlet pipe 9 allows gas to be introduced into the test chamber 1. Turning on the variable frequency fan allows the airflow generated by the fan to be blown towards the coal dust through the through-hole on the circular box 14. The coal dust then follows the airflow through the ventilation pipe 12, the air outlet pipe 10, and the conduit 15 into the test chamber 1. By adjusting the opening size of the solenoid valve and the wind speed of the variable frequency fan, the concentration of gas and coal dust inside the test chamber 1 can be adjusted, thus enabling the testing of the explosion-proof combination switch's operating status under different gas and coal dust concentrations. The extension of the cylinder 4 causes the pressure plate 5 to move downwards, compressing the explosion-proof combination switch and enabling the testing of its compressive strength.

[0031] The parts not disclosed in this utility model are all prior art, and their specific structures and working principles will not be described in detail.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0034] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A testing device for explosion-proof combination switches used in mines, comprising a test box (1), wherein the test box (1) has a door (2) at its front end and a platform (3) inside, characterized in that: A cylinder (4) is installed on the top of the test chamber (1) above the platform (3). A pressure plate (5) is installed on the output end of the cylinder (4). A cylinder (6) is provided on one side of the test chamber (1). A cylinder cover (7) is provided on the top of the cylinder (6). A feed hopper (8) is connected to the front end. An air inlet pipe (9) and an air outlet pipe (10) are symmetrically fixed to the upper parts of both sides. A partition (11) is fixed to the upper part of the inner side. A passage is fixed to the top of the partition (11). The air duct (12) has a vertical pipe (13) that runs through the bottom surface of the cylinder (6) below the partition plate (11). A round box (14) is fixed to the top of the vertical pipe (13). Multiple through holes are opened on the bottom surface of the round box (14). The end of the air outlet pipe (10) is connected to a conduit (15) that extends into the test box (1). An exhaust pipe (16) is fixed to the side of the test box (1) away from the cylinder (6).

2. The testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The box door (2) is provided with an observation window (17), and a control panel (18) is provided below the observation window (17).

3. The testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The test box (1) has multiple wire holes at its rear end, and a sealing plug (19) is inserted into the inside of each wire hole.

4. The testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The top surface of the stage (3) is provided with an installation groove, and a pressure sensor is installed in the installation groove.

5. A testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The connection between the air inlet pipe (9) and the air outlet pipe (10) and the cylinder (6) is located above the partition plate (11). One-way valves are installed on both the air inlet pipe (9) and the ventilation pipe (12), and solenoid valves are also installed on the air inlet pipe (9) and the exhaust pipe (16).

6. The testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The top of the feed hopper (8) is provided with a top cover (20), and the connection between the feed hopper (8) and the cylinder (6) is located below the partition plate (11).

7. A testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The bottom of the cylinder (6) is fixedly connected to a limiting cylinder (21) sleeved on the outside of the vertical pipe (13), and a sealing ring is provided on the inner side of the limiting cylinder (21).

8. A testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The end of the exhaust pipe (16) is connected to a collection box (23) via a connecting pipe (22). The collection box (23) has a ventilation hole at the top and a discharge port at the front end. A filter screen (24) is installed in the ventilation hole, and a sealing cover (25) is provided at the discharge port.

9. A testing device for a mine explosion-proof combination switch according to claim 1, characterized in that: The test chamber (1) is equipped with a gas sensor and a dust concentration sensor.

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