CN107238456B - Clamping force test tool for isolating switch - Google Patents

Abstract

The invention provides a clamping force test tool for a disconnector, which comprises a first extruding part and a second extruding part both of which are bow-shaped in cross section, and the bowstring parts of the two extruding parts are arranged oppositely, and a pressure is arranged between them. A sensor, a threaded joint is provided on the first force-bearing surface of the pressure sensor, a threaded hole is provided on the second force-bearing surface, the pressure sensor and the second extrusion part are fixedly connected by fasteners, and the second extrusion part is provided with The rotation structure enables the fastener to correspond to the threaded hole through rotation after the pressure sensor is connected to the first extrusion part. The beneficial effect of the present invention is that: after the pressure sensor is connected with the first extruding part, the fastener can be rotated in the rotating structure to correspond to the threaded hole on the pressure sensor to realize the connection between the second extruding part and the pressure sensor. The arrangement of the rotating structure weakens the influence of the precession angle of the pressure sensor on fixing the second extruded part by the fastener, ensures the assembly accuracy of the test tooling, and reduces the measurement error.

Description

Clamping force test tool for isolating switch

technical field

The invention relates to a clamping force testing tool for an isolating switch.

Background technique

The current high-voltage AC isolating switch products, such as scissor-type isolating switch, clamp-type isolating switch, etc., need to measure the clamping force between the dynamic and static contacts when the factory test is completed after assembly. A clamping force measurement device capable of simulating the shape of a static contact is needed. The Chinese invention patent with the authorized announcement number CN103217245B and the authorized announcement date of 2016.03.09 discloses a clamping force measuring device for disconnectors. The device includes a first extrusion part and a second extrusion part with bow-shaped cross sections. , the bowstring parts of the two extruding parts are oppositely arranged, and a pressure sensor is arranged between them, and the two force-bearing surfaces of the pressure sensor are respectively fixedly connected with the first extruding part and the second extruding part, specifically, one of the pressure sensors is subjected to There is a threaded joint on the force surface, and three threaded holes uniformly distributed on the other force surface. When assembling, first use the threaded joint to fix the pressure sensor on the first extrusion part, and then use the screw to fix the second pressure sensor. The extruding part is fixed on the pressure sensor. For this reason, the first extruding part is provided with a fixing hole corresponding to the threaded joint, and the second extruding part is provided with three screw holes corresponding to the threaded holes on the pressure sensor.

After the assembly is completed, the outer peripheral surfaces of the first extruded part and the second extruded part form a circle, which simulates the shape of the static contact. When the moving contacts on both sides apply pressure to the two extruded parts, it is similar to the real one. The moving contact in the case squeezes the static contact to complete the measurement of the clamping force. During use, it was found that since the pressure sensor needs to be installed first, after the pressure sensor is installed, the three threaded holes on it must correspond to the screw holes on the second extrusion part, so that the second extrusion part can be fixed on the pressure sensor. Otherwise, once the holes are staggered, the second extrusion part cannot be fixed. At the same time, the depth at which the pressure sensor is screwed into the first extruded part will affect the cylindricity of the circumference formed by the first extruded part and the second extruded part after assembly. The most realistic static contact shape cannot be simulated.

Therefore, when the pressure sensor needs to meet the threaded hole corresponding to the screw hole on the second extrusion part, the angle of each rotation must be 120 degrees. In practical applications, the threaded joint of the pressure sensor used is usually M4 The thread has a pitch of 0.7mm. When the pressure sensor rotates 120 degrees, its screw-in length is one-third of 0.7mm, which is 0.23mm. Therefore, during the screw-in process of the pressure sensor, the influence on the above-mentioned circumference diameter is 0.23, 0.46, 0.7mm, and the diameter tolerance of the real static contact is generally within 0.05mm, far exceeding this allowable tolerance, so the diameter of the circle formed by the first extrusion part and the second extrusion part is If it cannot be precisely controlled, then the clamping force measured by the measuring device is not the most realistic, and there is a large measurement error.

Contents of the invention

The object of the present invention is to provide a clamping force test fixture for a disconnector that can reduce measurement errors.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A clamping force test tool for an isolating switch, comprising a first extruding part and a second extruding part both of which are bow-shaped in cross section, the bowstring parts of the two extruding parts are arranged oppositely, and a pressure sensor is arranged between them It has a first force-bearing surface and a second force-bearing surface, the first force-bearing surface is provided with a threaded joint for fixed connection with the first extrusion part, and the second force-bearing surface is provided with a threaded joint for fixing with the second extrusion part. The connected threaded hole, the pressure sensor and the second extrusion part are fixedly connected by a fastener, and the second extrusion part is provided with a rotating structure for the fastener to rotate relative to the center of the pressure sensor, and the rotation structure can make fastening After the pressure sensor is connected with the first extruding part, the component corresponds to the threaded hole by rotation.

The rotating structure is an arc-shaped long hole opened on the second extruding part, and the fastener is a bolt that passes through the arc-shaped long hole and cooperates with the threaded hole.

The fastener includes a fastening block and a fastening bolt, the fastening block is provided with a first bolt hole corresponding to the threaded hole, and the rotating structure is provided on the second extrusion part concentric with the sensor A circular hole is provided, and the fastening block is rotatably assembled in the circular hole.

The round hole is a stepped round hole, the fastening block is assembled in the small hole of the stepped round hole, and the fastener also includes a pressing plate arranged in the large hole of the stepped round hole for pressing the fastening block, the pressing plate Second bolt holes corresponding to the first bolt holes are arranged on the top.

The first extruding part is provided with a joint fixing hole for matching with the threaded joint of the pressure sensor, and the joint fixing hole is formed by an inner hole of a hard threaded sleeve fixed on the first extruding part.

A top screw for limiting the threaded joint is also fixed in the inner hole of the hard threaded sleeve.

The clamping force test fixture for the disconnector further includes a guide column passing through the second extrusion part and fixed on the first extrusion part for guiding and supporting the second extrusion part.

The second extruding part is provided with a guide column perforation, and the guide column perforation is a long hole.

Both ends of the first extruding part are provided with limiting blocks for restricting the axial movement of the second extruding part along the first extruding part.

The limiting block is provided with a fixing structure for fixing the isolating switch with a clamping force testing tool at a high place.

The beneficial effects of the present invention are: since the second extruding part is provided with a rotating structure for the fastener to rotate relative to the center of the pressure sensor, after the pressure sensor is connected to the first extruding part, the threaded hole on the pressure sensor It may be rotated to any position. At this time, the fastener can rotate itself relative to the center of the pressure sensor in the rotating structure, so that it corresponds to the threaded hole on the pressure sensor, so as to realize the connection between the second extrusion part and the pressure sensor. . The arrangement of the rotating structure weakens the influence of the screw-in angle of the pressure sensor on fixing the second extruded part by fasteners, that is, the influence on the diameter of the circle formed by the first extruded part and the second extruded part, through reasonable The unique design can realize the stepless adjustment of the pressure sensor in the range of 360 degrees, and finally does not affect the fixing of the second extrusion part by the fastener, so as to ensure the assembly accuracy of the test tool and reduce the measurement error.

Description of drawings

Fig. 1 is the use state figure of the embodiment 1 of clamping force test frock for isolating switch among the present invention;

Fig. 2 is a top cutaway view of Fig. 1;

Fig. 3 is a partial enlarged view in Fig. 2;

Fig. 4 is the front view of Fig. 1;

Fig. 5 is a front cutaway view of Fig. 1;

Fig. 6 is a three-dimensional structure diagram of the first extruding part;

Fig. 7 is a front sectional view of the first extrusion part;

Fig. 8 is a three-dimensional structure diagram of a second extruding part;

Fig. 9 is a front sectional view of the second extrusion part;

Fig. 10 is a three-dimensional structure diagram of a guide column;

Fig. 11 is the front view of guide post;

Fig. 12 is the structural diagram of pressing plate;

Figure 13 is a structural diagram of the fastening block;

Figure 14 is a structural diagram of the pressure sensor;

Fig. 15 is the right view of Fig. 14;

Fig. 16 is a three-dimensional structure diagram of a hard threaded sleeve;

Figure 17 is a cutaway front view of a hard threaded sleeve;

Fig. 18 is a top cutaway view of Embodiment 2 of the clamping force test tooling for the disconnector;

Fig. 19 is the front view of Fig. 18;

FIG. 20 is a structural diagram of the second extrusion part in FIG. 19 .

In the figure: 1. The first conductive rod; 2. The second conductive rod; 3. The cylinder; 31. The first fixing hole; 32. The first extrusion part; 33. The limit cylinder; ; 35. The third fixing hole; 36. The fourth fixing hole; 4. The second extrusion part; 41. The first perforation; 42. The second perforation; 43. Arc-shaped long hole; 5. Pressure sensor; 51. Sensor Signal line; 52. threaded joint; 53. threaded hole; 6. guide post; 61. guide support section; 62. fixed section; 63. limit step; 7. hard threaded sleeve; .Matching step; 73. Large diameter thread; 8. Top screw; 9. Fastening block; 91. First bolt perforation; 10. Pressing plate; 101. Second bolt perforation; 11. First contact; 12. Second Contact; 13. fastening bolt; 14. fastening screw; 15. fixed plate; 16. nut.

Detailed ways

Example 1 of the clamping force test tool for disconnectors is shown in Figures 1 to 17. The test tool is made of an aluminum rod that is turned and then cut by wire cutting. The hardness of the aluminum rod and the real static contact The material of the head is similar to copper, and it is not easy to damage the moving contact, so it can better simulate the working conditions of the real static contact, and the price is relatively cheap. The cut aluminum bar includes a column body 3 and a second extruded portion 4 with an arcuate cross section, and the column body 3 includes a first extruded portion 32 with an arcuate cross section and cylinders located at both ends of the first extruded portion 32 ( That is, the limiting cylinder 33). The bowstring parts of the first extruding part 32 and the second extruding part 4 are arranged oppositely, and a pressure sensor 5 is arranged between them. The pressure sensor 5 has a first force-bearing surface and a second force-bearing surface, and the first force-bearing surface It has a threaded joint 52 for fixed connection with the first extrusion part 32, and a threaded hole 53 for fixed connection with the second extrusion part 4 on the second force bearing surface. The threaded hole 53 has three parallel pressure sensors The central circumference of 5 is evenly distributed.

The first extrusion part 32 is provided with a joint fixing hole for cooperating with the threaded joint 52 of the pressure sensor 5. Since the material of the column body 3 is aluminum, the threaded joint 52 is an M4 thread with a pitch of 0.7mm. The tooth height is 0.35mm. Under the condition of force, it is easy to damage the threaded hole on the aluminum rod, and it is also easy to damage the thread on the pressure sensor, resulting in the failure of the test tooling. In order to avoid this situation, a hard threaded sleeve 7 is first fixed on the first extruded part 32, for this reason the first extruded part 32 is provided with a third fixing hole 35 for installing the hard threaded sleeve 7. The inner hole of the threaded sleeve 7, that is, the fifth fixing hole 71, forms a joint fixing hole matched with the threaded joint 52. The hard threaded sleeve 7 is made of a material with high strength and hardness. The thread strength is high and is not easily damaged. The large-diameter screw thread 73 is connected with the first extruding part 32, and a larger matching step 72 is designed to bear the positive pressure.

Screw the threaded joint 52 of the pressure sensor 5 into the fifth fixing hole 71. During the screwing process, the diameter of the circle formed by the first extruded part 32 and the second extruded part 4 is continuously measured. When the tolerance is within When within the range of 0.05mm, it means that the pressure sensor 5 has been installed in place. At this time, a jacking screw 8 for limiting the threaded joint 52 is installed at the other end of the fifth fixing hole 71, thereby limiting the screw-in depth of the threaded joint 52 , and make there is no gap at the thread, avoiding the shaking of the threaded joint 52, ensuring the measurement accuracy and prolonging the service life.

After the pressure sensor 5 is installed, the second extruding part 4 is installed on the pressure sensor 5 through fasteners. The fastener includes a fastening block 9, a pressure plate 10 and a fastening bolt 13, and the second extruding part 4 is provided with a first perforation 41 for assembling the fastener, the first perforation 41 is a stepped circular hole, and the fastening The block 9 is assembled in the small hole of the stepped circular hole, the pressing plate 10 is assembled in the large hole of the stepped circular hole, and the pressing plate 10 is pressed on the step surface of the fastening block 9 and the stepped circular hole. The fastening block 9 and the pressure plate 10 are arranged coaxially with the pressure sensor 5. The fastening block 9 is provided with three first bolt holes 91 corresponding to the positions of the threaded holes 53, and the pressure plate 10 is provided with three holes 91 corresponding to the positions of the first bolt holes. Corresponding to the second bolt hole 101, after the position of the pressure sensor 5 is determined, by rotating the fastening block 9 and the pressure plate 10, the first bolt hole 91 and the second bolt hole 101 can be corresponding to the threaded hole 53 of the pressure sensor, and then The fastening bolts 13 can be used to complete the fixing of the second extrusion part 4 and the pressure sensor. Therefore, the first perforation 41 is also the rotating structure provided on the second extruding part for the fastener to rotate relative to the center of the sensor, through which the fastener can be rotated freely, so regardless of the pressure sensor Wherever the threaded hole 53 on the top is rotated, the fastener can correspond to it through its own rotation.

Since the second extruding part 4 is completely fixed on the pressure sensor by fasteners, it also has a certain gravity and tends to tilt downward under normal circumstances, which will affect the measurement accuracy. In order to balance the gravity of the second extrusion part, support and guide it, a guide column 6 is installed on the second extrusion part 4, and the guide column 6 includes a guide support section 61 and a fixed section 62. The first extrusion The part 32 is provided with a second fixing hole 34, the fixing section 62 is threadedly connected with the second fixing hole 34, the second extrusion part 4 is provided with a second through hole 42, the guide support section 61 passes through the second through hole 42, and the second Two perforations 42 are long holes. This is because there are two pressure sensors arranged between the first extruding part 32 and the second extruding part 4, one on the left and one on the right, and there are two sets of corresponding hard threaded sleeves, fasteners, guide posts, etc. At this time, when the pressure sensor on one side is pressed first, the other side will move outwards, that is, "tilt up". A lot of "cocking". At the same time, since the perforation of the guide support section 61 is a long hole, the long hole can ensure that the second extruding part has a slight amount of shaking and will not be fastened. In addition, the limiting cylinders 33 on the left and right sides of the first extruding part 32 act as limiting blocks, thereby restricting the second extruding part 4 in the groove on the cylinder 3 to prevent it from moving along the first extruding part 4 . Axial movement of the pressure section.

The working principle of the clamping force test tool for isolating switches is: when in use, it can simulate the real static contact fixing situation, so that the whole test tool is suspended on a cross arm in the test workshop, so the limit column 33 There is a fixing structure for fixing the test tool at a high place on the top, the fixing structure is the first fixing hole 31, pass the first fixing hole 31 with a steel wire, and fix the other end of the steel wire on the cross arm. But in fact, due to the high height of the scissor-type isolating switch or the clamp-type isolating switch, there is no suitable place to fix the cross-arm in the workshop. An extrusion part 32 is fixed on the two first conductive rods 1 . Specifically, the arched part of the first extruding part 32 is provided with a fourth fixing hole 36, and the first conductive rod 1 and the first extruding part 32 are fixed by using the fastening screw 14, the fixing plate 15 and the nut 16, so as to ensure that the first extruding part 32 is fixed. The first contact 11 on a conductive rod 1 is in contact with the arched part of the first extrusion part 32 .

During the test, the sensor signal line 51 of the pressure sensor 5 is connected to the display (not shown in the figure), the first extrusion part 32 moves with the first conductive rod 1, when the second conductive rod 2 moves to the second conductive rod 2 on it When the two-contact 12 clamps the test tool, the size of the clamping force can be observed through the display to complete the test of the clamping force. Compared with the prior art, the test tooling of the present invention can freely rotate the pressure sensor within 360 degrees when the whole test tool is assembled without being limited by the rotation angle of 120 degrees. The rotation of the firmware relative to the center of the pressure sensor can make the bolt perforation on the fastener correspond to the position of the threaded hole on the pressure sensor to achieve fixation, which greatly improves the assembly accuracy of the test tool and ensures the accuracy of the measured clamping force. Authenticity, the measurement error is greatly reduced.

Embodiment 2 of the clamping force test tooling for disconnectors is shown in Figures 18 to 20. In this embodiment, the fasteners used to fix the second extrusion part 4 on the first extrusion part are only tightening The fastening bolt 13 is the same as the prior art. There are three fastening bolts 13, corresponding to the three threaded holes on the pressure sensor respectively. 43. At this time, when the pressure sensor is assembled on the first extrusion part, the arc-shaped long hole 43 is relatively easy to correspond to the threaded hole on the pressure sensor. Although it cannot realize stepless adjustment, it can adapt to the pressure sensor to a certain extent. The screw-in depth improves the assembly accuracy of the test fixture and reduces the measurement error. In this embodiment, the arc-shaped long hole 43 is a rotating structure through which the fastener passes and can rotate relative to the center of the pressure sensor.

In other embodiments of the clamping force testing tool for the disconnector: the limiting blocks at both ends of the first extrusion part may not be cylinders, such as squares; the fixing structure on the limiting blocks may not be holes, such as hanging ears; the two ends of the first extruding part may not be provided with limit blocks; the perforation of the guide post on the second extruding part may not be a long hole, but a circular hole; the second extruding part may not be provided with a guide post ; The inner hole of the hard threaded sleeve may not be provided with a top wire; the first extruded part may not be provided with a hard threaded sleeve, but a joint fixing hole is directly processed on the first extruded part; the fastener can be The pressure plate is not included, and the fastening block can have its own flange end face; when there are two or four threaded holes on the pressure sensor, there are also two or four bolt holes on the fastening block and the pressure plate. Or there are two or four corresponding arc-shaped slots on the second extrusion part.

Claims (7)

1. a kind of disconnecting switch clamping force test fixture is squeezed including the first arched press section of cross section and second Portion, the bowstring part of two press sections is oppositely arranged, between be equipped with pressure sensor, pressure sensor have the first stress surface and Second stress surface, is provided with the nipple for being fixedly connected with the first press section on the first stress surface, on the second stress surface It is provided with the threaded hole for being fixedly connected with the second press section, pressure sensor and the second press section pass through fastener stationary phase Even, it is characterised in that: the rotation knot for rotating for fastener relative to pressure sensor center is provided on the second press section Structure, the rotational structure can make fastener after pressure sensor is connect with the first press section by rotation and the threaded hole pair It answers, the threaded hole is uniformly distributed there are three and around the center circumferential of pressure sensor, and the fastener includes fastening block and fastening spiral shell Bolt opens up on fastening block there are three the first bolt penetration hole corresponding with the screw thread hole site, and the rotational structure is to be provided with The circular hole being arranged concentrically with sensor on second press section, the circular hole are ladder circular hole, and fastening block is rotatable to be assemblied in In the aperture of ladder circular hole, the fastener further includes the pressure for being used to compress fastening block being arranged in the macropore of ladder circular hole Plate, opens up that there are three the second bolt penetration holes corresponding with the first bolt penetration hole position on pressing plate；By fastener relative to pressure The rotation of center sensor keeps the first bolt penetration hole on fastener corresponding with the screw thread hole site on pressure sensor.

2. disconnecting switch according to claim 1 clamping force test fixture, it is characterised in that: be arranged on the first press section Have for the connector fixation hole with the cooperation of the nipple of pressure sensor, the connector fixation hole is by being fixed on the first press section On hard thread bush inner hole constitute.

3. disconnecting switch according to claim 2 clamping force test fixture, it is characterised in that: the inner hole of hard thread bush In be further fixed on the jackscrew limited for new designs of threaded joints.

4. disconnecting switch according to claim 1 clamping force test fixture, it is characterised in that: disconnecting switch clamping force Test fixture further includes being fixed on the first press section to be used to that the second press section to be oriented to and be propped up across the second press section The guide post of support.

5. disconnecting switch according to claim 4 clamping force test fixture, it is characterised in that: be arranged on the second press section There is guide post perforation, guide post perforation is long hole.

6. disconnecting switch according to claim 1 clamping force test fixture, it is characterised in that: the both ends of the first press section It is provided with the limited block moved axially for limiting the second press section along the first press section.

7. disconnecting switch according to claim 6 clamping force test fixture, it is characterised in that: be arranged on the limited block Have for disconnecting switch to be fixed pinnacled fixed structure with clamping force test fixture.