A method for fixing the center of the compressive performance of electrical casing

Abstract

The invention relates to a method for fixing the center of the compression performance of an electric bushing in the field of compression testing. By setting a multi-directional limiting component, the bushing can be fixed and the center position can be ensured in a short time, thereby improving work efficiency. Moreover, the sample can be limited in the horizontal, longitudinal and vertical directions. Meanwhile, during the test, under the setting of a radial motion indicating component, the radial position of the electric bushing sample can be monitored in real time. When radial rolling or movement occurs, it can be detected in time, which is convenient for staff to make adjustments in time. Compared with the prior art, the accuracy of the compression test result is effectively guaranteed. Moreover, during the test, there is no need to manually support the sample, thereby greatly reducing the safety hazards of the electric bushing during the compression test.

Description

Technical Field

[0001] The invention relates to a method for fixing the center of an electrician bushing, in particular to a method for fixing the center of the compression performance of an electrician bushing in the field of compression resistance testing. Background Art

[0002] The full name of the threading pipe is "insulated electrical conduit for construction". Generally speaking, it is a white hard PVC wire pipe that is corrosion-resistant, leak-proof, and used for threading wires. It is divided into plastic threading pipe, stainless steel threading pipe, and carbon steel threading pipe.

[0003] In an electric bushing compression test machine disclosed in Chinese patent CN215004689U and an electric bushing compression performance test balance device disclosed in Chinese patent CN216350071U, when conducting compression test on electric bushing, a special clamp or fixing device is used to fix the position of the electric bushing, while the test in the existing workshop is more inclined to manual support positioning. Compared with the fixing method in the patent, the fixing method only has a fixing effect on the electric bushing. When it moves during the test, it is difficult to detect, which affects the test result. The manual support positioning method is difficult to strictly control its stability during the test, and secondly, there are certain safety hazards to the staff. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that during the compression test, the sample with a circular cross section is easy to move and difficult to detect, resulting in a certain deviation in the test result.

[0005] In order to solve the above problems, the present invention provides a method for fixing the compression performance center of an electrical bushing, comprising the following steps:

[0006] S1. First, install a multi-directional limit assembly on the test station of the test platform so that the center of the multi-directional limit assembly is directly at the center of the test station of the compression performance test equipment;

[0007] The multi-directional limit assembly includes a circular frame, two free limit ends respectively connected to the left and right ends of the circular frame, and two pairs of positioning bars respectively fixedly connected to the front and rear ends of the circular frame, and each positioning bar is fixed to the test platform by a plurality of bolts;

[0008] S2. First, use a marker to draw a positioning mark on the electrical conduit sample to be tested, and then place the electrical conduit sample to be tested in the circular frame with the positioning mark facing upwards. At the same time, the two free limit ends respectively limit the two lateral ends of the sample. The circular frame limits the sample in the longitudinal and vertical directions so that the center of the sample coincides with the center of the test station, completing the center fixation of the electrical conduit sample.

[0009] In the above-mentioned method for fixing the center of the compressive performance of the electrical casing, by setting a multi-directional limit assembly, the casing can be fixed in a short time and the center position can be ensured, thereby improving work efficiency. At the same time, during the test process, any movement can be detected in time, thereby effectively ensuring the accuracy of the compressive test results.

[0010] As a further improvement of the present application, the length of the circular frame is 180-220 mm, the diameter of the circular frame is 20-24 mm, the length of the free limiting end is not less than 75 mm, and the interval between the positioning strip and the adjacent end of the circular frame is not less than 50 mm.

[0011] As a further improvement of the present application, the circular frame is a split arrangement, comprising two side tubes and an auxiliary measuring tube fixedly connected between the two side tubes, an embedded groove is cut at the outward end of the auxiliary measuring tube, and the free limiting end is slidably connected to the embedded groove.

[0012] As a further improvement of the present application, the free limiting end includes an extending arc piece slidably connected to the embedded groove and a top sample piece fixedly connected to the end of the extending arc piece. A plurality of evenly distributed length control holes are opened in the middle of the extending arc piece, and two locking holes corresponding to the length control holes are opened at the upper end of the side tube. A pin is inserted into the locking hole, and the lower end of the pin is embedded in the corresponding length control hole. During testing, the two ends of the sample respectively collide with the two top sample pieces.

[0013] As a further improvement of the present application, the auxiliary measuring tube includes a bottom supporting end and an upper measuring end fixedly connected to the upper end of the bottom supporting end, the connection between the positioning strip and the auxiliary measuring tube is located on the bottom supporting end, the bottom supporting end and the side tube are both hard shaped structures, the upper measuring end is an elastic structure, and the upper measuring end is not fixed to the side tube, and the central angle corresponding to the cross section of the upper measuring end is greater than 180°.

[0014] As another improvement of the present application, the circular frame is integrally arranged, and an auxiliary measuring port is opened in the middle of the upper end of the circular frame, the cross-sectional angle of the auxiliary measuring port opening is not less than 120°, and the opening of the auxiliary measuring port is larger than the maximum cross-sectional length of the test head.

[0015] As another improvement of the present application, one of the free limiting ends includes a top sample piece and a plurality of sample-adaptive twist bars respectively connected between the top sample piece and the end of the circular frame, the plurality of sample-adaptive twist bars are distributed in a circular array, and the sample-adaptive twist bars are elastic structures.

[0016] As another improvement supplement of the present application, a radial movement indicating assembly is provided on the two top sample pieces, and the radial movement indicating assembly includes two pipe limiting rings respectively fixedly connected to the top sample pieces, an infrared laser rangefinder installed on one pipe limiting ring, a laser receiver installed on the other pipe limiting ring, and a double-headed measuring rope installed between the two pipe limiting rings.

[0017] As another improved supplement of the present application, the double-headed measuring rope includes a rope body and connecting blocks connected to both ends of the rope body, a tension sensor is connected between one connecting block and a pipe limiting ring, a T-shaped hole is drilled on the other pipe limiting ring, the other connecting block is clamped with the T-shaped hole, and the center point of the T-shaped hole and the laser receiver are located on the same diameter of the cross-section of the pipe limiting ring.

[0018] In summary, by setting up a multi-directional limit assembly, the casing can be fixed and the center position can be ensured in a short time, thereby improving work efficiency. Moreover, the specimen can be limited in the horizontal, longitudinal and vertical directions. At the same time, during the test, under the setting of the radial motion indication assembly, the radial position of the electrical casing specimen can be monitored in real time. When radial rolling or movement occurs, it can be detected in time, which is convenient for the staff to make timely adjustments. Compared with the existing technology, the accuracy of the compression test results is effectively guaranteed. In addition, during the test, there is no need to manually support the specimen, which greatly reduces the safety hazards of electric casing during compression testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional diagram of a multi-directional limiting assembly in the first embodiment of the present application;

[0020] Figure 2 This is a side cross-sectional view of a multi-directional limit assembly according to the first embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of testing an electrical bushing after positioning in the first embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of testing an electrical bushing after positioning in the prior art;

[0023] Figure 5 This is a three-dimensional diagram of a multi-directional limiting assembly in the second embodiment of the present application;

[0024] Figure 6 This is a three-dimensional diagram of a multi-directional limiting assembly in the third embodiment of the present application;

[0025] Figure 7 A three-dimensional diagram of an end portion of one side of a multi-directional limit group in a third embodiment of the present application;

[0026] Figure 8 This is a three-dimensional diagram of the other end portion of the multi-directional limit group in the third embodiment of the present application.

[0027] Description of the numbers in the figure:

[0028] 1 circular frame, 11 side tube, 12 auxiliary measuring tube, 121 bottom bearing end, 122 upper measuring end, 101 auxiliary measuring port, 2 positioning strips, 201 bolts, 31 extended arc piece, 32 top sample piece, 33 sample twisting strip, 301 length control hole, 302 pin, 4 double-head measuring rope, 5 limiting tube ring, 501 T-shaped hole, 61 infrared laser rangefinder, 62 laser receiver. DETAILED DESCRIPTION

[0029] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0030] The first implementation method:

[0031] Figure 3 A method for fixing the compressive performance center of an electrical casing is shown, comprising the following steps:

[0032] S1. First, install a multi-directional limit assembly on the test station of the test platform so that the center of the multi-directional limit assembly is directly at the center of the test station of the compression performance test equipment;

[0033] like Figure 1 The multi-directional limit assembly includes a circular frame 1, two free limit ends respectively connected to the left and right ends of the circular frame 1, and two pairs of positioning bars 2 respectively fixedly connected to the front and rear ends of the circular frame 1, and each positioning bar 2 is fixed to the test platform by a plurality of bolts 201;

[0034] S2. First, draw a positioning mark on the electrical conduit sample to be tested with a marker pen, and then place the electrical conduit sample to be tested in the circular frame 1, with the positioning mark facing upwards, and at the same time, the two free limit ends respectively limit the two lateral ends of the sample. The circular frame 1 limits the sample in the longitudinal and vertical directions, so that the center of the sample coincides with the center of the test station, and the center fixation of the electrical conduit sample is completed. The positioning mark can determine the radial position of the test tube to a certain extent. During the test, when it moves or rolls due to extrusion, the relative position of the positioning mark and the circular frame 1 will change significantly, which can remind the staff in time and facilitate timely adjustment.

[0035] The length of the circular frame 1 is 180-220 mm, the diameter of the circular frame 1 is 20-24 mm, the length of the free limit end is not less than 75 mm, and the interval between the positioning strip 2 and the adjacent end of the circular frame 1 is not less than 50 mm.

[0036] like Figure 1 The circular frame 1 is a split type arrangement, and includes two side tubes 11 and an auxiliary measuring tube 12 fixedly connected between the two side tubes 11. An embedded groove is cut at the end of the auxiliary measuring tube 12 facing outward, and the free limit end is slidably connected to the embedded groove.

[0037] The free limit end includes an extended arc piece 31 slidably connected to the embedded groove and a top sample piece 32 fixedly connected to the end of the extended arc piece 31. A plurality of evenly distributed control holes 301 are chiseled in the middle of the extended arc piece 31. Two locking holes corresponding to the control holes 301 are chiseled at the upper end of the side tube 11. A latch 302 is inserted into the locking hole, and the lower end of the latch 302 is embedded in the corresponding control hole 301. During the test, the two ends of the sample are respectively in conflict with the two top sample pieces 32. When the sample of the electrical casing is placed in the multi-directional limit When inserting the component into the position, first pull out the pin 302 to make the two protruding arc pieces 31 in a free state, then insert the sample into the circular frame 1, and at the same time control the length of its two ends extending outside the side tube 11 to remain consistent, and adjust the protruding arc piece 31 to make the top sample piece 32 contact with the end of the sample tube, finally, insert the pin 302 into the locking hole and extend it to the corresponding length control hole 301, so that the electrical conduit is restricted in the lateral direction, and at the same time, under the action of the side tube 11 and the auxiliary measuring tube 12, it is limited in the longitudinal and vertical directions.

[0038] like Figure 2 The auxiliary measuring tube 12 includes a bottom supporting end 121 and an upper measuring end 122 fixedly connected to the upper end of the bottom supporting end 121. The connection between the positioning strip 2 and the auxiliary measuring tube 12 is located on the bottom supporting end 121. The bottom supporting end 121 and the side tube 11 are both hard and fixed structures. The upper measuring end 122 is an elastic structure, and the upper measuring end 122 is not fixed to the side tube 11. The central angle corresponding to the cross section of the upper measuring end 122 is greater than 180°. The elastic upper measuring end 122 can be deformed with the extrusion of the test head. When performing a compression test, it can be deformed without consuming a lot of force, so that it is not easy to affect the test results, effectively ensuring that this method of fixing the sample is not easy to affect the accuracy of the test results.

[0039] In the above-mentioned method for fixing the center of the compressive performance of the electrical casing, by setting the multi-directional limit assembly, the casing can be fixed in a short time and the center position can be ensured, thereby improving work efficiency. At the same time, during the test process, movement can be detected in time, thereby effectively ensuring the accuracy of the compressive test results. Figure 4 The existing technology in the test does not require manual support of the sample during testing, effectively reducing the safety hazards during testing.

[0040] The second implementation method:

[0041] This embodiment is based on the first embodiment, and the arrangement of the circular frame 1 is changed, while the rest of the parts remain the same as the first embodiment.

[0042] Figure 5It is shown that the circular frame 1 is integrally arranged, and an auxiliary measuring port 101 is opened in the middle of the upper end of the circular frame 1, the cross-sectional angle of the opening of the auxiliary measuring port 101 is not less than 120°, and the opening of the auxiliary measuring port 101 is larger than the maximum cross-sectional length of the test head. In this embodiment, the electrical bushing sample to be tested is in direct contact with the test head, that is, it is directly subjected to force. Compared with the test method of the first embodiment through the upper measuring end 122, the test result is more accurate and the effect is better.

[0043] The third implementation method:

[0044] Based on the second embodiment, this embodiment adds a radial motion indication component and changes the specific setting of the free limit end, and the rest is consistent with the first embodiment.

[0045] Figure 6 It is shown that one of the free limit ends includes a top sample piece 32 and a plurality of sample-following twist bars 33 respectively connected between the top sample piece 32 and the end of the circular frame 1. The plurality of sample-following twist bars 33 are distributed in a circular array, and the sample-following twist bars 33 are elastic structures. It is worth noting that during the test, the length of the sample is controlled to be greater than the total length of the circular frame 1 and the two free limit ends when they are naturally straightened, so that when the sample is installed in the multi-directional limit assembly, it is ensured that the top sample piece 32 is in conflict with the sample. At the same time, due to the elasticity of the sample-following twist bars 33, the sample and the top sample piece 32 can be temporarily integrated. When the sample rotates radially, the plurality of sample-following twist bars 33 will be tilted and twisted to a certain extent. This phenomenon can effectively remind the staff of the movement of the sample.

[0046] It is worth noting that the tilt torsion may be smaller than the rotation amplitude of the sample itself. The other free limit end is consistent with the first embodiment, that is, two top sample pieces 32, one is radially fixed and the other is movable. When the sample rolls, it can cause the infrared laser rangefinder 61 and the laser receiver 62 to be misaligned to a certain extent.

[0047] like Figure 7-8, a radial motion indicating assembly is arranged on the two top sample pieces 32, and the radial motion indicating assembly comprises two tube limiting rings 5 ​​respectively fixedly connected with the top sample pieces 32, an infrared laser rangefinder 61 installed on one tube limiting ring 5, a laser receiver 62 installed on the other tube limiting ring 5, and a double-headed measuring and shifting rope 4 installed between the two tube limiting rings 5, the double-headed measuring and shifting rope 4 comprises a rope body and connecting blocks connected at both ends of the rope body, a tension sensor is connected between a connecting block and a tube limiting ring 5, a T-shaped hole 501 is drilled on the other tube limiting ring 5, another connecting block is clamped with the T-shaped hole 501, and the center point of the T-shaped hole 501 and the laser receiver 62 is located on the same diameter of the cross section of the tube limiting ring 5, when the sample rotates radially, it may cause the infrared laser rangefinder 61 and the laser receiver 62 to be misaligned, As a result, the laser receiver 62 cannot receive data. At the same time, during the test, as the force increases, the sample gradually deforms, and the deformation extends from the middle to both sides. When the deformation is large, it will block the laser light path emitted by the infrared laser rangefinder 61. At this time, the laser receiver 62 also cannot receive data. In this case, with the action of the double-headed measuring rope 4, when the sample is twisted, the two ends of the corresponding double-headed measuring rope 4 may also be misaligned to a certain extent, resulting in the tension on the double-headed measuring rope 4 becoming larger. At this time, the data on the tension sensor changes, and when there is no radial movement under pressure, the data on the tension sensor does not change, or changes very little. Therefore, with the double-headed measuring rope 4, the real-time situation of the sample can be monitored, which further improves the accuracy of the monitoring results compared to the existing technology.

[0048] In summary, by setting up a multi-directional limit assembly, the casing can be fixed and the center position can be ensured in a short time, thereby improving work efficiency. Moreover, the specimen can be limited in the horizontal, longitudinal and vertical directions. At the same time, during the test, under the setting of the radial motion indication assembly, the radial position of the electrical casing specimen can be monitored in real time. When radial rolling or movement occurs, it can be detected in time, which is convenient for the staff to make timely adjustments. Compared with the existing technology, the accuracy of the compression test results is effectively guaranteed. In addition, during the test, there is no need to manually support the specimen, which greatly reduces the safety hazards of electric casing during compression testing.

[0049] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A method for fixing the compressive performance center of an electrical casing, characterized by: The following steps are involved: S1. First, install a multi-directional limit assembly on the test station of the test platform so that the center of the multi-directional limit assembly is directly at the center of the test station of the compression performance test equipment; The multi-directional limiting assembly comprises a circular frame (1), two free limiting ends respectively connected to the left and right ends of the circular frame (1), and two pairs of positioning bars (2) respectively fixedly connected to the front and rear ends of the circular frame (1), each positioning bar (2) being fixed to the test platform by a plurality of bolts (201); S2. First, a positioning mark is drawn on the electrical conduit sample to be tested with a marker pen, and then the electrical conduit sample to be tested is placed in the circular frame (1), with the positioning mark facing upward, and at the same time, the two free limit ends are respectively limited to the two lateral ends of the sample. The circular frame (1) limits the sample in the longitudinal and vertical directions, so that the center of the sample coincides with the center of the test station, and the center of the electrical conduit sample is fixed; The circular frame (1) comprises two side tubes (11) and an auxiliary measuring tube (12) fixedly connected between the two side tubes (11); an inner groove is bored at the end of the auxiliary measuring tube (12) facing outward; the free limiting end is slidably connected to the inner groove; the free limiting end comprises an extended arc piece (31) slidably connected to the inner groove and a top sample piece (32) fixedly connected to the end of the extended arc piece (31); a plurality of evenly distributed control length holes (301) are bored in the middle of the extended arc piece (31); two locking holes corresponding to the control length holes (301) are bored at the upper end of the side tube (11); a latch (302) is inserted into the locking hole. , and the lower end of the latch (302) is embedded in the corresponding length control hole (301). During testing, the two ends of the sample are respectively in contact with the two top sample pieces (32). The auxiliary test tube (12) includes a bottom support end (121) and an upper test end (122) fixedly connected to the upper end of the bottom support end (121). The connection between the positioning strip (2) and the auxiliary test tube (12) is located on the bottom support end (121). The bottom support end (121) and the side tube (11) are both hard and fixed structures. The upper test end (122) is an elastic structure, and the upper test end (122) is not fixed to the side tube (11). The central angle corresponding to the cross section of the upper test end (122) is greater than 180°.

2. A method for fixing the compressive performance center of an electrical casing according to claim 1, characterized in that: The length of the circular frame (1) is 180-220 mm, the diameter of the circular frame (1) is 20-24 mm, the length of the free limit end is not less than 75 mm, and the spacing between the positioning strip (2) and the adjacent end of the circular frame (1) is not less than 50 mm.

3. A method for fixing the compressive performance center of an electrical casing, characterized in that: The following steps are involved: S1. First, install a multi-directional limit assembly on the test station of the test platform so that the center of the multi-directional limit assembly is directly at the center of the test station of the compression performance test equipment; The multi-directional limiting assembly comprises a circular frame (1), two free limiting ends respectively connected to the left and right ends of the circular frame (1), and two pairs of positioning bars (2) respectively fixedly connected to the front and rear ends of the circular frame (1), each positioning bar (2) being fixed to the test platform by a plurality of bolts (201); S2. First, a positioning mark is drawn on the electrical conduit sample to be tested with a marker pen, and then the electrical conduit sample to be tested is placed in the circular frame (1), with the positioning mark facing upward, and at the same time, the two free limit ends are respectively limited to the two lateral ends of the sample. The circular frame (1) limits the sample in the longitudinal and vertical directions, so that the center of the sample coincides with the center of the test station, and the center of the electrical conduit sample is fixed; An auxiliary measuring port (101) is cut in the middle of the upper end of the circular frame (1), the cross-sectional angle of the opening of the auxiliary measuring port (101) is not less than 120 degrees, and the opening of the auxiliary measuring port (101) is larger than the maximum cross-sectional length of the test head, one of the free limit ends comprises a top sample piece (32) and a plurality of sample-following twist bars (33) respectively connected between the top sample piece (32) and the end of the circular frame (1), the plurality of sample-following twist bars (33) are distributed in a circular array, and the sample-following twist bars (33) are elastic structures, two of the top sample pieces (32) are provided with radial indication components, and the radial indication components comprise two fixedly connected to the top sample pieces (32) and the radially movable indicating components. A pipe limiting ring (5), an infrared laser rangefinder (61) installed on one pipe limiting ring (5), a laser receiver (62) installed on the other pipe limiting ring (5), and a double-ended measuring rope (4) installed between the two pipe limiting rings (5), the double-ended measuring rope (4) comprising a rope body and connecting blocks connected to both ends of the rope body, a tension sensor connected between one connecting block and one pipe limiting ring (5), a T-shaped hole (501) bored on the other pipe limiting ring (5), the other connecting block being snap-fitted to the T-shaped hole (501), and the center point of the T-shaped hole (501) and the laser receiver (62) being located on the same diameter of the cross section of the pipe limiting ring (5).

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