Clamping tool for testing electrical characteristics of electric detonators

Abstract

This invention relates to a clamping fixture for testing the electrical characteristics of electric detonators, comprising a venting base, a pressure ring at the upper end of the venting base, and a rotating cover on top of the pressure ring; the rotating cover has a discharge hole and arc-shaped grooves on both sides of the discharge hole; a rectangular groove is formed on the top of the venting base, and a pair of sliders are provided in the rectangular groove, each slider having a guide rod at its top, and the two guide rods are respectively fitted into the arc-shaped groove; a square flange hole is formed at the center of the bottom of the rectangular groove, and the fixture is fitted in the square flange hole; a venting hole communicating with the square flange hole is formed on the bottom of the venting base, and a fixture positioning hole and a lead hole are formed on the side; the fixture positioning hole communicates with the square flange hole and also has a positioning post inside; the lead hole communicates with the venting hole and is used to lead out the lead terminal of the electric detonator shell. This invention provides convenient and quick clamping, improves the testing efficiency of electric detonators, and the bottom of the fixture can complete the venting, greatly protecting the personal safety of the operator.

Description

Technical Field

[0001] This invention belongs to the field of electrical characteristic testing technology for pyrotechnic products, and particularly relates to a clamping fixture for testing the electrical characteristics of electric detonators. Background Technology

[0002] During the electrical characteristic testing of electric detonators, it is necessary to measure their electrical insulation parameters, resistance parameters, and withstand voltage. Currently, the electrical characteristics testing of electric detonators involves using a simple clamp made of highly conductive copper. This clamp is attached to the outer casing of the detonator under test. Then, the outer casing end and the terminal end of the detonator are led out and connected to an insulation tester or a resistance tester in two steps, thereby enabling the measurement of the electric detonator's electrical insulation parameters, resistance parameters, and withstand voltage.

[0003] When testing electric detonators, especially during insulation testing, a high voltage of about 1500V needs to be applied to the product and the casing. However, during resistance testing, a very small current needs to pass through the positive and negative terminals of the product. If an operational error occurs, it can easily pose a certain safety risk to the test personnel.

[0004] However, using simple clamps to hold electric detonators can easily damage them and cause poor contact. Furthermore, connecting insulation resistance meters or ohmmeters for testing requires connecting different instruments for different test items to achieve testing of all parameters such as insulation resistance, product resistance, and withstand voltage. The lead output operation for the electrical test parameters of electric detonators is cumbersome and the testing efficiency is low. In addition, the electric detonator under test is partially exposed to the outside during the testing of certain parameters, without very safe explosion-proof measures, which poses a potential threat to the safety of the testing personnel. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a clamping fixture for testing the electrical characteristics of electric detonators. The fixture is easy and quick to clamp, improving the testing efficiency of electric detonators. Furthermore, the bottom of the fixture can release the explosion, greatly protecting the personal safety of the operators.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A clamping fixture for testing the electrical characteristics of an electric detonator includes a venting base, a pressure ring is provided on the upper end of the venting base, the top surface of the pressure ring is flush with the top surface of the venting base, and a rotating cover is provided on the top of the pressure ring; the rotating cover has a discharge hole and arc-shaped grooves respectively provided on both sides of the discharge hole.

[0008] The explosion relief base has a rectangular groove at the top, and a pair of sliders are arranged opposite each other in the rectangular groove. Guide rods are provided at the top of the two sliders, and the two guide rods are respectively sleeved in the arc-shaped sliding grooves on the rotating cover.

[0009] A square flange hole is provided at the center of the bottom of the rectangular groove, and a tool for installing an electric detonator is fitted inside the square flange hole. The top surface of the tool is flush with the bottom surface of the rectangular groove.

[0010] The bottom of the explosion vent base is provided with an explosion vent hole that communicates with the square flange hole, and the sides are provided with a tooling positioning hole and a lead wire hole respectively; the tooling positioning hole communicates with the square flange hole and is provided with a positioning post for fixing the tooling; the lead wire hole communicates with the square flange hole and is used to lead out the lead wire terminal for the insulation test of the electric detonator shell.

[0011] Preferably, the pressure ring and the rotating cover are provided with a plurality of threaded holes, and the pressure ring and the rotating cover are connected by screw threads.

[0012] Preferably, the pressure ring can rotate to carry the rotating cover. When rotated clockwise, it can separate the two sliders; when rotated counterclockwise, it can close the two sliders.

[0013] Preferably, each guide rod is fitted with a shoulder-shaped thin-walled oil-free bushing.

[0014] Preferably, the lower end of the explosion venting base is fitted with a nut, a spring washer, and a flat washer in sequence from bottom to top, so that the explosion venting base can be fixed on the electric detonator test bench by means of the nut, spring washer, and flat washer.

[0015] Preferably, semicircles are provided on opposite sides of the two sliders. When the sliders are closed with the positioning block, the two semicircles form a circular hole, which facilitates the lead-out of the positive and negative wires of the electric detonator.

[0016] Preferably, the discharge hole and the square flange hole are coaxial.

[0017] Preferably, the tooling has through holes at the top and bottom, with the diameter of the top hole being larger than the diameter of the electric detonator and the diameter of the bottom hole being smaller than the diameter of the electric detonator.

[0018] The technical effects and advantages of this invention are as follows:

[0019] 1. This invention provides a clamping fixture for testing the electrical characteristics of electric detonators. By designing a rotating cover, pressure ring, slider, and fixture on a detonator venting base, the slider can be opened or closed by rotating the pressure ring and rotating the cover during electric detonator testing, quickly completing the clamping or removal of the electric detonator without wasting time on clamping. Furthermore, the electric detonator makes good contact and will not be damaged. Simultaneously, the positive and negative terminals and the outer shell can be led out in one operation during the electric detonator's electrical characteristic testing, thereby completing the measurement of electrical insulation parameters, resistance parameters, and withstand voltage. The lead-out operation of the electric detonator's electrical test parameters is simple, greatly improving the testing efficiency of electric detonators.

[0020] 2. The present invention provides a clamping fixture for testing the electrical characteristics of electric detonators. Through the design of a venting base with venting holes, if the electric detonator under test detonates during testing, the bottom of the fixture can vent the explosion, preventing any safety damage to the operator and greatly protecting the operator's personal safety. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the present invention without a rotating cover;

[0023] Figure 3 This is an exploded cross-sectional view of the present invention. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

[0025] See Figures 1-3 As shown, a clamping fixture for testing the electrical characteristics of an electric detonator includes a detonation base 1, a pressure ring 2 is provided on the upper end of the detonation base 1, the top surface of the pressure ring 2 is flush with the top surface of the detonation base 1, and a rotating cover 3 is provided on its top; the rotating cover 3 has a discharge hole 18 and arc-shaped grooves 4 respectively provided on both sides of the discharge hole 18.

[0026] The explosion venting base 1 has a rectangular groove 5 on its top. A pair of sliders 12 are arranged opposite each other in the rectangular groove 5. Guide rods 13 are provided on the top of each slider 12. The two guide rods 13 are respectively fitted into the arc-shaped sliding grooves 4 on the rotating cover 3. A shoulder-shaped thin-walled oil-free bushing 14 is fitted on each guide rod 13.

[0027] A square flange hole 6 is provided at the center of the bottom of the rectangular groove 5. A fixture 7 for installing an electric detonator is fitted inside the square flange hole 6. The top surface of the fixture 7 is flush with the bottom surface of the rectangular groove 5.

[0028] The bottom of the explosion relief base 1 is provided with an explosion relief hole 8 that communicates with the square flange hole 6. Through the explosion relief hole 8, if the tested electric detonator detonates during testing, the bottom of the fixture can complete the explosion relief, which will not cause safety damage to the operator and greatly protects the personal safety of the operator.

[0029] The explosion venting base 1 has a tooling positioning hole 9 and a lead wire hole 10 on its side. The tooling positioning hole 9 communicates with the side of the square flange hole 6 and is provided with a positioning post 11 for fixing the tooling 7. The lead wire hole 10 communicates with the bottom of the square flange hole 6 and is used to lead out the lead wire terminal for the insulation test of the electric detonator shell. The lead wire terminal is used to connect to the insulation resistance test equipment to complete the insulation resistance test of the electric detonator shell.

[0030] In practice, the discharge hole 18 and the square flange hole 6 are coaxial, which facilitates the installation of the electric detonator.

[0031] For specific implementation, please refer to Figure 3 As shown, the pressure ring 2 and the rotating cover 3 are provided with a plurality of threaded holes, and the pressure ring 2 and the rotating cover 3 are connected by screw threads.

[0032] In practice, the pressure ring 2 can rotate with the rotating cover 3. When rotated clockwise, the two sliders 12 can be separated; when rotated counterclockwise, the two sliders 12 can be closed.

[0033] In specific implementation, the lower end of the explosion relief base 1 is fitted with a nut 15, a spring washer 16 and a flat washer 17 in sequence from bottom to top. The explosion relief base 1 can be fixed on the electric detonator test bench by means of the nut 15, the spring washer 16 and the flat washer 17.

[0034] In practice, semicircles are provided on the opposite sides of the two sliders 12. When the sliders 12 are closed with the positioning block, the two semicircles form a circular hole, which facilitates the lead-out of the positive and negative wires of the electric detonator and their connection with the test system.

[0035] In specific implementation, the tooling 7 has through holes at the top and bottom. The diameter of the hole at the top is larger than the diameter of the electric detonator to facilitate the insertion of the electric detonator, while the diameter of the hole at the bottom is smaller than the diameter of the electric detonator to prevent the electric detonator from falling off.

[0036] In this embodiment, during detonator testing, the slider 12 can be opened or closed by rotating the pressure ring 2 and the rotating cover 3, allowing for quick placement or removal of the detonator into or out of the fixture. This eliminates the need for time-consuming clamping, making clamping convenient. After clamping, the detonator maintains good contact with the fixture 7, ensuring uninterrupted signal measurement during insulation resistance measurement and preventing damage to the detonator. Furthermore, after clamping, the positive and negative terminals for electrical characteristic testing can be led out from the top of the fixture, and the detonator housing lead terminals can be led out from the side of the fixture, connecting to the testing equipment to measure electrical insulation parameters, resistance parameters, and withstand voltage. The lead output operation for the electrical test parameters is simple, greatly improving the testing efficiency of the detonator.

[0037] It should be noted that multiple clamping fixtures of this application can be installed on an electric detonator testing platform for clamping electric detonators. Specifically, 1 to 20 fixture mounting holes are spaced apart on the electric detonator testing platform. When installing the fixtures, the nut 15 and the spring washer 16 are removed from the explosion venting base 1, and then the lower end of the explosion venting base 1 is inserted into the fixture mounting hole so that the flat washer 17 fits against the table surface of the electric detonator testing platform. Finally, the spring washer 16 is inserted from the bottom of the explosion venting base 1, and the explosion venting base 1 is locked onto the electric detonator testing platform by the nut 15.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A clamping fixture for testing the electrical characteristics of an electric detonator, characterized in that: It includes an explosion relief base (1), with a pressure ring (2) on the upper end of the explosion relief base (1). The top surface of the pressure ring (2) is flush with the top surface of the explosion relief base (1), and a rotating cover (3) is also provided on its top. The rotating cover (3) has a discharge hole (18) and arc-shaped grooves (4) respectively opened on both sides of the discharge hole (18). The explosion relief base (1) has a rectangular groove (5) on its top. A pair of sliders (12) are arranged opposite each other in the rectangular groove (5). Guide rods (13) are provided on the top of the two sliders (12). The two guide rods (13) are respectively sleeved in the arc-shaped sliding grooves (4) on the rotating cover (3). The pressure ring (2) can rotate the rotating cover (3). When rotated clockwise, it can separate the two sliders (12); when rotated counterclockwise, it can close the two sliders (12). A square flange hole (6) is provided at the center of the bottom of the rectangular groove (5). A fixture (7) for installing an electric detonator is fitted inside the square flange hole (6). The top surface of the fixture (7) is flush with the bottom surface of the rectangular groove (5). The bottom of the explosion relief base (1) is provided with an explosion relief hole (8) that communicates with the square flange hole (6), and the sides are provided with a tooling positioning hole (9) and a lead wire hole (10); the tooling positioning hole (9) communicates with the side of the square flange hole (6), and a positioning post (11) for fixing the tooling (7) is also provided inside; the lead wire hole (10) communicates with the bottom of the square flange hole (6) and is used to lead out the lead wire terminal for the insulation test of the electric detonator shell.

2. The clamping fixture for testing the electrical characteristics of an electric detonator according to claim 1, characterized in that: The pressure ring (2) and the rotating cover (3) are provided with a plurality of threaded holes, and the pressure ring (2) and the rotating cover (3) are connected by screw threads.

3. The clamping fixture for testing the electrical characteristics of an electric detonator according to claim 1, characterized in that: Each guide rod (13) is fitted with a shoulder-shaped thin-walled oil-free bushing (14).

4. The clamping fixture for testing the electrical characteristics of an electric detonator according to claim 1, characterized in that: The explosion relief base (1) is fitted with a nut (15), a spring washer (16) and a flat washer (17) from bottom to top at its lower end. The explosion relief base (1) can be fixed on the electric detonator test bench by means of the nut (15), the spring washer (16) and the flat washer (17).

5. The clamping fixture for testing the electrical characteristics of an electric detonator according to claim 1, characterized in that: The two sliders (12) have semicircles on opposite sides. When the sliders (12) and the positioning block are closed, the two semicircles form a circular hole, which facilitates the lead-out of the positive and negative wires of the electric detonator.

6. The clamping fixture for testing the electrical characteristics of an electric detonator according to claim 1, characterized in that: The discharge hole (18) and the square flange hole (6) are coaxial.

7. The clamping fixture for testing the electrical characteristics of an electric detonator according to claim 1, characterized in that: The tooling (7) has through holes at the top and bottom. The diameter of the hole at the top is larger than the diameter of the electric detonator, and the diameter of the hole at the bottom is smaller than the diameter of the electric detonator.

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