Cable explosion-proof box performance detection tool

Abstract

A performance testing fixture for cable explosion-proof boxes, belonging to the field of cable explosion-proof box testing technology, includes a testing table. A U-shaped seat is fixedly installed on the upper surface of the testing table, and a platform is fixedly installed on the upper surface of the U-shaped seat. An adapter groove is opened on the upper surface of the platform, and a clamping device is rotatably installed on the upper surface of the platform. The clamping device and the platform are fitted with locking components. Two lead screw slides are symmetrically slidably installed on the testing table with the U-shaped seat as the central axis. A synchronous drive device is installed on the testing table. A connecting block is fixedly installed on the upper surface of each lead screw slide, and a sealing cylinder is fixedly installed inside each connecting block. A sealing sleeve is fixedly installed on the end of each sealing cylinder facing the platform. An air inlet is opened through the right surface of the right sealing cylinder, and an air guide pipe is fixedly connected to the air inlet. An air supply pipe is connected to the air inlet end of the air guide pipe. This utility model can effectively simulate actual continuous pressure scenarios such as gas expansion during cable short circuits, filling the gap in the lack of continuous pressure resistance and sealing performance testing.

Description

Technical Field

[0001] This utility model belongs to the field of cable explosion-proof box testing technology, specifically relating to a performance testing fixture for cable explosion-proof boxes. Background Technology

[0002] As a critical protective component in electrical wiring, the performance of explosion-proof cable boxes directly affects electrical safety in explosive environments. Existing technologies primarily focus on impact resistance when testing the performance of explosion-proof cable boxes. For example, utility model patent number 202322774654.7 discloses a performance testing device for explosion-proof cable boxes. This device uses a cyclic impact unit to periodically strike the inside of the explosion-proof box with a striking pin, simulating the impact effect of an internal explosion, thereby testing the box's impact resistance.

[0003] However, this type of internal impact-based testing method has significant limitations: it primarily tests the structural resistance under instantaneous impact loads, but it struggles to simulate the continuous internal pressure increases that explosion-proof boxes may face in actual use (such as gas expansion caused by cable short circuits, abnormal changes in ambient air pressure, etc.). In real-world operating conditions, explosion-proof boxes not only need to withstand instantaneous impacts but also maintain structural integrity and sealing performance under long-term or continuous pressure to prevent leakage of explosive media or intrusion from the external environment. Existing technologies lack effective testing methods specifically for the continuous pressure resistance and sealing performance of explosion-proof boxes, resulting in test results that cannot fully reflect their actual performance under complex operating conditions, creating blind spots in safety assessments.

[0004] To address this issue, another type of performance testing fixture for explosion-proof cable boxes is provided. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a performance testing fixture for cable explosion-proof boxes, which solves the problem that the existing cable explosion-proof box performance testing equipment lacks effective testing methods specifically for the continuous pressure resistance and sealing performance of explosion-proof boxes, resulting in blind spots in safety assessment.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A performance testing fixture for cable explosion-proof boxes includes a testing table. A U-shaped base is fixedly installed on the upper surface of the testing table, and a platform is fixedly installed on the upper surface of the U-shaped base. An adapter groove for supporting the cable explosion-proof box to be tested is opened on the upper surface of the platform, and a clamping device for pressing down and limiting the cable explosion-proof box to be tested is rotatably installed on the upper surface of the platform. The clamping device and the platform are fitted with locking components. Two lead screw slides are symmetrically slidably installed on the testing table with the U-shaped base as the central axis, and a synchronous drive device for synchronously driving the two lead screw slides to move inward or outward is installed on the testing table.

[0008] A connecting block is fixedly installed on the upper surface of the lead screw slide, and a sealing cylinder is fixedly installed inside the connecting block. A sealing sleeve is fixedly installed on the end of the sealing cylinder facing the platform. An air inlet is opened through the right surface of the sealing cylinder on the right side. An air guide pipe is fixedly connected to the air inlet. An air supply pipe is connected to the air inlet end of the air guide pipe. The air supply pipe is connected to an external high-pressure air supply pump.

[0009] In the above technical solution, two fixing blocks are fixedly installed on the upper surface of the platform, the clamping device includes an arc-shaped plate, two L-shaped blocks are fixedly installed on the lower surface of the arc-shaped plate, and a rotating shaft is rotatably installed between the L-shaped blocks and the fixing blocks.

[0010] In the above technical solution, the locking component is a bolt and nut assembly, and two hinge blocks are fixedly installed on the front surface of the platform. The bolt of the bolt and nut assembly is rotatably installed between the two hinge blocks.

[0011] An extension block is fixedly installed on the upper surface of the arc-shaped plate. A locking groove is provided through the outer surface of the extension block. When the arc-shaped plate is flipped, the extension block is flipped to the position above the hinge block, and the locking groove is located above the bolt and nut assembly.

[0012] In the above technical solution, a pressure gauge is fixedly installed on the outer surface of the air guide tube.

[0013] In the above technical solution, two lugs are fixedly installed on the upper surfaces of both the left and right ends of the testing platform, and a guide rod is fixedly installed between the two lugs. The guide rods pass through the U-shaped seat, and the lead screw slide is slidably arranged between the two guide rods.

[0014] In the above technical solution, the synchronous drive device includes two bearing seats, which are respectively fixedly installed on the upper surfaces of the left and right ends of the testing table, and the bearing seats are located between the two lugs on the same side. A bidirectional lead screw with positive and negative threads is rotatably installed between the two bearing seats. Two lead screw slides are symmetrically sleeved on the outer surface of the bidirectional lead screw with the table as the axis. A handwheel is fixedly installed on the right end of the bidirectional lead screw.

[0015] The present invention provides a performance testing fixture for explosion-proof cable boxes, which, compared with the prior art, has the following advantages:

[0016] This testing fixture, through the cooperation of a sealing cylinder and a sealing sleeve, combined with an external high-pressure air pump, can apply continuous rated pressure, effectively simulating actual continuous pressure scenarios such as gas expansion during cable short circuits. This fills the gap in existing technologies that can only detect instantaneous impacts and lack continuous pressure resistance and sealing performance testing, providing a more comprehensive reflection of the actual working performance of explosion-proof boxes. At the same time, the flip-out arc-shaped plate clamping device and bolt and nut assembly enable quick fixing, and the synchronous drive structure of the forward and reverse threaded double screw and handwheel can adapt to explosion-proof boxes of different lengths, simplifying the assembly and disassembly process. Furthermore, the pressure gauge can monitor the pressure in real time, making operation convenient and efficient, greatly improving the practicality and versatility of the testing. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the connecting block of this utility model.

[0019] Figure 3 This is a schematic diagram of the clamping device structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the mechanism when the present invention is in use.

[0021] Figure 5 for Figure 4 Detailed image of point a in the middle.

[0022] Figures 1-5 The components include: 1. Testing table; 11. U-shaped seat; 12. Ear block; 121. Guide rod; 2. Platform; 21. Adaptor groove; 22. Fixing block; 23. Rotating shaft; 24. Hinge block; 3. Clamping device; 31. Arc plate; 311. L-shaped block; 312. Extension block; 313. Locking groove; 4. Bolt and nut assembly; 5. Lead screw slide; 51. Connecting block; 6. Synchronous drive device; 61. Bearing seat; 62. Double-sided lead screw with positive and negative threads; 63. Handwheel; 7. Sealing cylinder; 71. Sealing sleeve; 72. Air inlet; 8. Air guide pipe; 81. Pressure gauge; 9. Air supply pipe. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In this embodiment, front, back, left, right, top, and bottom are... Figure 1 Describe the reference plane. See [link / reference] Figures 1-5 This utility model provides a technical solution:

[0025] A performance testing fixture for explosion-proof cable boxes includes a testing platform 1. The testing platform 1, serving as the basic support component of the entire fixture, is integrally cast from high-strength alloy steel to ensure sufficient structural strength to withstand the pressure load during testing. A U-shaped base 11 is welded to the upper surface of the testing platform 1. A carrier platform 2 is bolted to the upper surface of the U-shaped base 11. An adapter groove 21 for supporting the explosion-proof cable box under test is provided on the upper surface of the carrier platform 2. The shape of the adapter groove 21 is similar to that of common explosion-proof cable boxes. The bottom contour of the box matches, and the upper surface of the platform 2 is rotatably mounted with a clamping device 3 for pressing down and limiting the explosion-proof box of the cable to be tested. The clamping device 3 and the platform 2 are equipped with locking parts. The clamping device 3 and the platform 2 can be fixed relative to each other by locking parts. The explosion-proof box of the cable to be tested is limited from the vertical direction. Two lead screw slides 5 are symmetrically slidably mounted on the test platform 1 with the U-shaped seat 11 as the central axis. The test platform 1 is also equipped with a synchronous drive device 6 for synchronously driving the two lead screw slides 5 to move inward or outward.

[0026] Connecting blocks 51 are fixedly installed on the upper surface of the lead screw slide 5. The connecting blocks 51 are made of aluminum alloy, which reduces the overall weight while ensuring connection strength. A sealing cylinder 7 is fixedly installed inside the connecting blocks 51. The outer end of the sealing cylinder 7 is a closed end, and a sealing sleeve 71 is fixedly installed on the end of the sealing cylinder 7 facing the platform 2. The sealing sleeve 71 is made of high-pressure resistant nitrile rubber, and its cross-section is trumpet-shaped. When the sealing sleeve 71 contacts the end of the cable explosion-proof box, it can ensure that there is no air leakage during the test. An air inlet 72 is opened through the right surface of the right sealing cylinder 7. An air guide pipe 8 is fixedly connected to the air inlet 72. The air guide pipe 8 is made of stainless steel rigid pipe. The air supply pipe 9 is connected to the air inlet end of the air guide pipe 8. The air supply pipe 9 is connected to an external high-pressure air supply pump for use as the air source supply during the test.

[0027] Combination Figure 1 and Figure 3As shown, two fixing blocks 22 are fixedly installed on the upper surface of the platform 2. The fixing blocks 22 are distributed behind the adapter groove 21. The clamping device 3 includes an arc plate 31. The curvature of the arc plate 31 is adapted to the top contour of a common cable explosion-proof box. Two L-shaped blocks 311 are fixedly installed on the lower surface of the arc plate 31. A rotating shaft 23 is rotatably installed between the L-shaped blocks 311 and the fixing blocks 22 through a bearing, so that the arc plate 31 can be rotated around the rotating shaft 23, thereby realizing the pressing down or releasing of the explosion-proof box.

[0028] Combination Figure 1 and Figure 3 As shown, the locking component is a bolt and nut assembly 4. Two hinge blocks 24 are fixedly installed on the front surface of the platform 2. The bolt of the bolt and nut assembly 4 is rotatably installed between the two hinge blocks 24. An extension block 312 is fixedly installed on the upper surface of the arc plate 31. A locking groove 313 is opened through the outer surface of the extension block 312. The width of the locking groove 313 is slightly larger than the diameter of the bolt in the bolt and nut assembly 4. When the arc plate 31 flips and drives the extension block 312 to flip above the hinge block 24, the locking groove 313 is exactly above the bolt of the bolt and nut assembly 4. After flipping the bolt and nut assembly 4 into the locking groove 313, tightening the nut can fix the arc plate 31 to the platform 2.

[0029] Using the bolt and nut assembly 4 as the locking component, the structure is simple and the locking is reliable. Through the cooperation of the extension block 312 and the locking groove 313, the clamping device 3 can be fixed quickly, ensuring that the cable explosion-proof box will not be displaced upward due to pressure during high-voltage testing, thus ensuring the stability of the test.

[0030] Combination Figure 2 As shown, a pressure gauge 81 is fixedly installed on the outer surface of the air duct 8. The pressure gauge 81 can be used to monitor the gas pressure entering the explosion-proof box in real time, which makes it convenient for operators to control the output pressure of the high-pressure air supply pump according to the testing requirements, and to observe in real time whether there is a problem with insufficient sealing of the cable explosion-proof box during the inspection process.

[0031] Combination Figure 1 As shown, two lugs 12 are fixedly installed on the upper surfaces of both the left and right ends of the testing table 1. A guide rod 121 is fixedly installed between the two lugs 12. The guide rods 121 pass through the U-shaped seat 11. The screw slide 5 is slidably arranged between the two guide rods 121. The screw slide 5 is horizontally slidably arranged on the testing table 1 through the guide rods 121.

[0032] Finally, it should be noted that, in combination Figure 1 or Figure 4As shown, the synchronous drive device 6 includes two bearing seats 61. The two bearing seats 61 are fixedly installed on the upper surfaces of the left and right ends of the test table 1, and the bearing seats 61 are located between two lugs 12 on the same side. A bidirectional lead screw 62 with positive and negative teeth is rotatably installed between the two bearing seats 61. Two lead screw slides 5 are symmetrically sleeved on the outer surface of the bidirectional lead screw 62 with the platform 2 as the axis. A handwheel 63 is fixedly installed on the right end of the bidirectional lead screw 62 with positive and negative teeth.

[0033] The cooperation between the forward and reverse threaded bidirectional lead screw 62 and the handwheel 63 allows the two lead screw slides 5 to move synchronously inward or outward by rotating the handwheel 63. This drives the two side sealing cylinders 7 to move towards the cable explosion-proof box, and the sealing sleeves 71 complete the sealing work at both ends of the cable explosion-proof box. At the same time, it can ensure that the contact pressure between the two side sealing cylinders 7 and the two ends of the cable explosion-proof box is uniform. This structural design allows the tooling to be quickly adapted to explosion-proof boxes of different lengths, enhancing the versatility of the tooling.

[0034] In use, this invention first involves rotating the handwheel 63 to drive the bidirectional screw 62 (positive and negative threads) according to the length of the explosion-proof box to be tested. This drives the two screw slides 5 to move outwards synchronously along the guide rod 121, placing the explosion-proof box in the adapter slot 21 of the platform 2. The arc plate 31 is then flipped down to press against the top of the explosion-proof box, and the arc plate 31 is locked in place by the bolt and nut assembly 4. Next, the handwheel 63 is rotated in the opposite direction to move the two screw slides 5 inwards until the sealing sleeve 71 is in close contact with both ends of the explosion-proof box. Finally, the air supply pipe 9 is connected to an external high-pressure air pump, and the high-pressure air pump is started to introduce air into the explosion-proof box. The pressure is monitored by the pressure gauge 81 until it reaches the rated value. After maintaining this pressure for a period of time, the performance test is completed by observing whether the explosion-proof box is intact. Compared with the existing technology, this test fixture applies continuous rated pressure through the sealing structure of the sealing cylinder 7 and the sealing sleeve 71 and the external high-pressure pump. This can simulate actual continuous pressure scenarios such as gas expansion due to cable short circuits, which is more in line with actual working conditions and can fully reflect the pressure resistance and sealing performance. This overcomes the limitation of the existing technology that only simulates instantaneous impact. Moreover, the operation of flipping and clamping, and adjusting the handwheel 63 simplifies the assembly and disassembly process. Combined with the real-time monitoring of the pressure gauge 81, the operation is convenient and efficient, and the test efficiency is better than that of the existing technology.

Claims

1. A performance testing fixture for explosion-proof cable boxes, comprising a testing table (1), characterized in that, The upper surface of the testing platform (1) is fixedly mounted with a U-shaped seat (11), and the upper surface of the U-shaped seat (11) is fixedly mounted with a platform (2). The upper surface of the platform (2) is provided with an adapter groove (21) for supporting the explosion-proof box of the cable to be tested. The upper surface of the platform (2) is rotatably mounted with a clamping device (3) for pressing down and limiting the explosion-proof box of the cable to be tested. The clamping device (3) and the platform (2) are fitted with locking components. Two lead screw slides (5) are symmetrically slidably mounted on the testing platform (1) with the U-shaped seat (11) as the central axis. The testing platform (1) is also equipped with a synchronous drive device (6) for synchronously driving the two lead screw slides (5) to move inward or outward. A connecting block (51) is fixedly installed on the upper surface of the lead screw slide (5). A sealing cylinder (7) is fixedly installed inside the connecting block (51). A sealing sleeve (71) is fixedly installed on the end of the sealing cylinder (7) facing the platform (2). An air inlet (72) is opened through the right surface of the sealing cylinder (7). An air guide pipe (8) is fixedly connected to the air inlet (72). An air supply pipe (9) is connected to the air inlet end of the air guide pipe (8). The air supply pipe (9) is connected to an external high-pressure air supply pump.

2. The performance testing fixture for an explosion-proof cable box according to claim 1, characterized in that, The upper surface of the platform (2) is fixedly installed with two fixing blocks (22), the clamping device (3) includes an arc plate (31), the lower surface of the arc plate (31) is fixedly installed with two L-shaped blocks (311), and a rotating shaft (23) is rotatably installed between the L-shaped blocks (311) and the fixing blocks (22).

3. The performance testing fixture for cable explosion-proof boxes according to claim 2, characterized in that, The locking component is a bolt and nut assembly (4), and two hinge blocks (24) are fixedly installed on the front surface of the platform (2). The bolt of the bolt and nut assembly (4) is rotatably installed between the two hinge blocks (24). An extension block (312) is fixedly installed on the upper surface of the arc plate (31). A locking groove (313) is provided through the outer surface of the extension block (312). When the arc plate (31) flips and drives the extension block (312) to flip above the hinge block (24), the locking groove (313) is located above the bolt and nut assembly (4).

4. The performance testing fixture for cable explosion-proof boxes according to claim 1, characterized in that, A pressure gauge (81) is fixedly installed on the outer surface of the air duct (8).

5. The performance testing fixture for cable explosion-proof boxes according to claim 1, characterized in that, Two ear blocks (12) are fixedly installed on the upper surfaces of both the left and right ends of the detection table (1). A guide rod (121) is fixedly installed between the two ear blocks (12). The guide rod (121) passes through the U-shaped seat (11). The screw slide (5) is slidably arranged between the two guide rods (121).

6. The performance testing fixture for cable explosion-proof boxes according to claim 5, characterized in that, The synchronous drive device (6) includes two bearing seats (61), which are fixedly installed on the upper surfaces of the left and right ends of the test table (1), and the bearing seats (61) are located between the two lugs (12) on the same side. A double-sided screw (62) with positive and negative teeth is rotatably installed between the two bearing seats (61). Two screw slides (5) are symmetrically sleeved on the outer surface of the double-sided screw (62) with the platform (2) as the axis. A handwheel (63) is fixedly installed on the right end of the double-sided screw (62).

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