Method and device for testing mechanical characteristics of circuit breaker

Abstract

The invention provides a method and a device for testing mechanical characteristics of a circuit breaker, and belongs to the technical field of testing of electrical performance of the circuit breaker. The testing device comprises a base body, a contact and a testing rod, a screw hole is formed in the end of one of the contact and the testing rod, a stud is arranged at the end of the other one of the contact and the testing rod, the testing device further comprises a positioning assembly for positioning the contact on the base body when testing is not carried out and positioning the testing rod when testing is carried out, and the positioning assembly comprises a positioning cap detachably connected with the base body or the end cover of the circuit breaker. The positioning cap is provided with a stop wall used for being in stop fit with the end face of the test rod. The stop wall is provided with a stud through hole for a stud on the contact to pass through or a screw through hole corresponding to a screw hole on the contact, and the positioning assembly further comprises a nut used for being connected with the stud on the contact or a screw penetrating through the stop wall to be connected with the screw hole on the contact. The test rod can be reliably prevented from moving by adopting an end face stopping mode, reliable contact between the contact and the conductor component is ensured, and the test can be smoothly carried out.

Description

Technical Field

[0001] The invention relates to a circuit breaker mechanical characteristic testing method and a testing device, belonging to the technical field of circuit breaker electrical performance testing. Background Art

[0002] In high-voltage sulfur hexafluoride circuit breakers, measuring mechanical characteristic parameters is a key means of verifying circuit breaker performance. Especially for double-break tank-type circuit breakers, it is necessary to measure parameters such as opening speed, closing speed, opening time, closing time, overtravel, and synchronicity of each break to ensure they meet requirements.

[0003] Chinese utility model patent application number CN202119635U discloses a device for testing the mechanical properties of high-voltage circuit breakers. The device comprises a base fixed to the circuit breaker end cap. The base is provided with a guide hole, within which a measuring head mounting seat is slidably and sealably mounted. One end of the measuring head mounting seat is mounted with a measuring head for contacting the high-voltage circuit breaker guide seat (a conductive component within the circuit breaker) and transmitting the fracture characteristic signal. Together, the measuring head mounting seat and the measuring head form a contact. An extended guide rod (i.e., a test rod) can be mounted at the other end of the measuring head mounting seat. The guide rod has a threaded mounting section at its end, and a threaded hole at the end of the contact, allowing the guide rod and contact to be removable. During use, the guide rod is used to insert the contact into the circuit breaker cavity, where it contacts and conducts with the transmission case, completing the test circuit. After the test is complete, the contact is removed using the guide rod. Once the contact end is exposed from the base, the guide rod can be removed. In order to avoid poor contact caused by the guide rod and contact moving up and down during the measurement process, and to keep the contact on the base when not testing, a tapered hole is provided on the base, and a tapered sleeve is installed in the tapered hole. The guide rod and the contact pass through the tapered sleeve. A locking nut is assembled on the outside of the base. Tightening the locking nut can squeeze the tapered sleeve so that the tapered sleeve clamps the guide rod or contact in the radial direction to fix its position. When the guide rod or contact needs to move, just loosen the locking nut. The locking nut and the tapered sleeve together constitute a positioning assembly, and the locking nut constitutes a positioning cap.

[0004] When in use, the test device uses a taper sleeve and a lock nut to position the guide rod. The locking force is generated by the lock nut squeezing the taper sleeve axially, causing it to displace radially, thereby exerting a radial clamping force on the guide rod. The guide rod's position is secured entirely by static friction between the taper sleeve and the guide rod. However, in actual testing, when the operating mechanism drives the moving end assembly to open and close the circuit, it instantly generates very large vibrations. This vibration is transmitted to the guide rod through the transmission box, causing it to be subjected to a very large upward vibration force. Relying solely on static friction to secure the guide rod's position is highly unreliable. During testing, the guide rod frequently moves, causing the contacts to separate from the transmission box, preventing the formation of a test circuit and, consequently, preventing the successful testing of the circuit breaker's mechanical characteristics. Summary of the Invention

[0005] The present invention aims to provide a method for testing the mechanical characteristics of a circuit breaker to solve the problem in the prior art that a test rod is held in place solely by static friction, which causes the test rod to easily move when subjected to the vibration force generated at the moment of opening and closing, thereby causing the contacts to lose reliable contact and the test to be unable to proceed smoothly. The present invention also aims to provide a device for testing the mechanical characteristics of a circuit breaker to solve the above-mentioned problem.

[0006] To achieve the above objectives, the circuit breaker mechanical characteristics testing method of the present invention adopts the following technical solutions: The method for testing the mechanical characteristics of a circuit breaker is as follows: before the test, the contact is sent into the circuit breaker through a test rod connected to the contact to be connected to the conductor component, and then a positioning cap is installed on the end cover of the circuit breaker or the base of the test device. The end face of the test rod is stopped by the stop wall of the positioning cap to prevent the contact from being separated from the conductor component during the test; after the test is completed, the positioning cap is first removed, and then the test rod is pulled out and the contact is taken out. When the end of the contact is exposed from the base, the test rod is removed, and then the positioning cap is installed on the end cover or base of the circuit breaker, so that the stud on the contact passes through the stop wall and is connected to the nut, or a screw is used to pass through the stop wall and be connected to the screw hole on the contact to position the contact on the base. When testing is required, the nut or screw is removed and the positioning cap is removed to connect the contact to the test rod.

[0007] The beneficial effect of the above technical solution is that the present invention pioneers a method for testing the mechanical characteristics of a circuit breaker. In this testing method, after the test rod sends the contact into the circuit breaker and conducts with the conductor component, a positioning cap is installed on the circuit breaker end cover or the base of the test device, and the end face of the test rod is blocked by the blocking wall of the positioning cap. In this way, during the test process, even if the vibration force generated at the moment of opening and closing is transmitted to the test rod, the test rod cannot move, and thus the contact connected to the test rod cannot be separated from the conductor component. Compared with the positioning method relying solely on static friction in the prior art, the end face blocking can more reliably prevent the test rod from moving, ensure reliable contact between the contact and the conductor component, and thus ensure that the test of the mechanical characteristics of the circuit breaker can be carried out smoothly.

[0008] Because the retaining wall of the positioning cap blocks the end face of the test rod, the positioning cap must be removed after the test is completed before the test rod and the contacts can be pulled out. Once the contact ends are exposed from the base, the test rod is removed, and the positioning cap is installed on the circuit breaker end cover or base. The stud on the contact passes through the retaining wall and is connected to the nut, or a screw is passed through the retaining wall and connected to the screw hole on the contact. This can position the contact on the base, ensuring a sufficient distance between the contact and the conductive components inside the circuit breaker, while preventing the long test rod from extending outward and affecting the normal operation of the circuit breaker. When it is necessary to test again, remove the nut or screw and the positioning cap, connect the contact to the test rod, and repeat the above steps.

[0009] Furthermore, when installing the positioning cap before testing, the external threaded rod on the end face of the test rod passes through the positioning cap and is connected to the nut, or the screw passes through the positioning cap and is connected to the internal threaded hole on the end face of the test rod.

[0010] Furthermore, before testing, the test wire connected to the tester is pressed against the positioning cap by the head of a nut or a screw to achieve conduction between the test wire and the test rod.

[0011] To achieve the above objectives, the circuit breaker mechanical characteristics testing device of the present invention adopts the following technical solutions: A circuit breaker mechanical characteristics testing device includes a base, contacts, and a test rod connected to the contacts during testing and removed when not testing, wherein one of the contact and the test rod has a screw hole at its end, and the other has a stud at its end for mating with the screw hole. The device also includes a positioning assembly for positioning the contact on the base when not testing and for positioning the test rod during testing, wherein the positioning assembly includes a positioning cap for detachably connecting to the base or a circuit breaker end cover, the positioning cap having a stop wall for mating with an end face of the test rod; the stop wall is provided with a stud through-hole for passing a stud on the contact or a screw through-hole corresponding to the screw hole on the contact; the positioning assembly also includes a nut for connecting to the stud on the contact or a screw passing through the stop wall and connected to the screw hole on the contact.

[0012] The beneficial effect of the above technical solution is that: the present invention proposes an improved circuit breaker mechanical characteristics testing device, the improvement is that the positioning cap has a stop wall for cooperating with the end face stop of the test rod, so that during the test process, even if the vibration force generated at the moment of opening and closing the circuit breaker is transmitted to the test rod, the test rod cannot move, and the contact connected to the test rod cannot be separated from the conductor component. Compared with the positioning method that relies solely on static friction in the prior art, the end face stop can more reliably prevent the test rod from moving, ensure that the contact and the conductor component are in reliable contact, and thus ensure that the test of the mechanical characteristics of the circuit breaker can be carried out smoothly.

[0013] At the same time, the stopping wall is provided with stud through-holes for the studs on the contacts to pass through or screw through-holes corresponding to the screw holes on the contacts. The positioning assembly also includes nuts for connecting to the studs on the contacts or screws passing through the stopping wall and connected to the screw holes on the contacts. In this way, after the test is completed, the contacts can be positioned on the seat more conveniently, and when re-testing is required, it is only necessary to remove the nuts or screws and the positioning cap to connect the contacts to the test rod.

[0014] Furthermore, an external threaded rod or an internal threaded hole is provided on the end face of the test rod. During testing, the external threaded rod passes through the stud hole on the positioning cap and is connected to the nut, or the screw passes through the screw hole on the positioning cap and is connected to the internal threaded hole.

[0015] Furthermore, during testing, the head of the nut or screw forms a pressing structure for pressing the test wire connected to the tester onto the positioning cap.

[0016] Furthermore, the circuit breaker mechanical characteristics testing device also includes a washer, which is used to be sleeved on the outside of the screw or external threaded rod and compressed between the head of the screw and the positioning cap or between the nut and the positioning cap during testing. The washer is also used to be sleeved on the outside of the screw or stud and compressed between the head of the screw and the positioning cap or between the nut and the positioning cap when not testing.

[0017] Furthermore, the gasket includes a flat gasket and a spring gasket.

[0018] Furthermore, the contact includes an inserting portion for being inserted into the conductive hole of the conductor component and contacting and conducting with a contact finger installed in the conductive hole.

[0019] Furthermore, the contact is an integrally formed part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a test state diagram of embodiment 1 of the circuit breaker mechanical characteristics testing device of the present invention; Figure 2 for Figure 1 A partial enlarged view of the Figure 3 This is a structural diagram of the test rod in Example 1 of the circuit breaker mechanical characteristics testing device of the present invention; Figure 4 for Figure 2 An enlarged view of the middle seat body; Figure 5 for Figure 2 An enlarged view of the middle contact part; Figure 6 This is a partial structural diagram of the circuit breaker mechanical characteristics testing device embodiment 1 of the present invention in a non-test state; Figure 7This is a partial structural diagram of the circuit breaker mechanical characteristics testing device embodiment 2 of the present invention in the test state; Figure 8 This is a partial structural diagram of the circuit breaker mechanical characteristics testing device embodiment 2 of the present invention in a non-test state; Figure 9 This is a partial structural diagram of the circuit breaker mechanical characteristics testing device embodiment 3 of the present invention in the test state; Figure 10 This is a partial structural diagram of the circuit breaker mechanical characteristics testing device embodiment 3 of the present invention in a non-test state.

[0021] In the figure: 101, circuit breaker housing; 102, transmission box; 1021, spring contact finger; 103, circuit breaker end cover; 104, mechanical property tester; 105, test lead; 1, base; 11, first threaded section; 12, second threaded section; 13, optical axis section; 2, contact; 21, screw hole; 22, insertion part; 23, stop step; 24, stud; 3, test rod; 31, stud; 32, internal threaded hole; 33, external threaded rod; 4, positioning cap; 41, sleeve; 42, stop wall; 43, flange; 5, connecting screw; 6, flat washer; 7, spring washer; 8, protective cap; 9, fixing screw; 10, mounting screw; 100, nut. DETAILED DESCRIPTION

[0022] In response to the technical problems existing in the prior art, the basic concept of the present invention is to use a positioning cap to block the end face of the test rod to prevent the test rod and the contact from moving, ensuring stable contact between the contact and the conductor components in the circuit breaker. At the same time, the disassembly and assembly sequence of the positioning cap is adjusted, and a through-hole is provided on the positioning cap to cooperate with the stud or screw hole at the end of the contact, connect the corresponding nut or install the corresponding screw, so that the contact can be positioned on the base when not testing.

[0023] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0024] Embodiment 1 of the circuit breaker mechanical characteristics testing device (hereinafter referred to as the testing device) of the present invention: like Figure 1As shown, the structure of the circuit breaker, the test object of the test device, is first introduced. The circuit breaker in this embodiment is a double-break circuit breaker, including a circuit breaker housing 101. A transmission box 102 is disposed within the circuit breaker housing 101. The transmission box 102 has a break on each side, serving as the common terminal between the two break points. The transmission structure installed within the transmission box 102 is used to drive the left and right movable terminals to operate, thereby achieving opening and closing of the circuit breaker with the corresponding static terminals. A removable circuit breaker end cover 103 is installed on the circuit breaker housing 101 at a position corresponding to the transmission box 102. The test device of the present invention is mounted on the circuit breaker end cover 103. During the test, a mechanical property tester 104 is required (the tester is an existing product). The mechanical property tester 104 is connected to four test wires 105, two of which are connected to the static ends on the left and right sides respectively, and the other two are connected to the transmission box 102 through the test device to achieve conduction with the corresponding dynamic ends. The fractures on both sides and the mechanical property tester 104 form independent test circuits. The mechanical property tester 104 can measure the mechanical properties of the two fractures and the synchronicity of the two fractures.

[0025] like Figure 2 and Figure 4 As shown, the testing device includes a base 1 for sealingly securing to a circuit breaker end cap 103. Specifically, the circuit breaker end cap 103 has a through hole with threads machined on its inner wall. The base 1 is in the shape of a stepped shaft and includes a first threaded section 11, a second threaded section 12, and a smooth section 13 located between the two threaded sections. The smooth section 13 has a diameter greater than that of the threaded sections on either side. The second threaded section 12 mates with the through hole in the circuit breaker end cap 103 to secure the base 1 to the circuit breaker end cap 103. An annular groove is machined into the stepped surface formed by the second threaded section 12 and the smooth section 13. A sealing ring is installed in the groove and fits against the circuit breaker end cap 103 to achieve a seal between the base 1 and the circuit breaker end cap 103. The base 1 also has an axially extending guide hole machined through it. The inner wall of the guide hole is provided with two annular grooves, each containing a sealing ring.

[0026] The testing device also includes a contact 2 for conducting with the transmission box 102 during testing and positioned on the base 1 when not testing, such as Figure 6 As shown, when the contact 2 is positioned on the base 1 , it passes through the guide hole on the base 1 and contacts with two sealing rings on the inner wall of the guide hole, thereby achieving sealing between the base 1 and the contact 2 .

[0027] The testing device further comprises a testing rod 3 which is used to be connected to the contact 2 during testing so as to insert the contact 2 into the circuit breaker and is removed when not testing. That is, the connection between the contact 2 and the testing rod 3 is detachable. Figure 3 and Figure 5As shown, in this embodiment, a screw hole 21 is provided at one end of the contact 2, a stud 31 for cooperating with the screw hole 21 is provided at one end of the test rod 3, and an internal threaded hole 32 is provided on the end surface of the other end of the test rod 3.

[0028] like Figure 4 As shown, in the test state, the end of the test rod 3 extends out of the base body 1, and the test rod 3 passes through the guide hole on the base body 1. During the process of inserting the contact 2 into the circuit breaker, the test rod 3 is always in contact with the two sealing rings on the inner wall of the guide hole, thereby achieving a seal between the base body 1 and the test rod 3.

[0029] In addition, Figure 5 As shown, the transmission case 102 is provided with a conductive hole, in which a contact finger is mounted. In this embodiment, a spring contact finger 1021 is mounted. The other end of the contact 2 is provided with an insertion portion 22 for inserting into the conductive hole of the transmission case 102 and contacting and conducting with the spring contact finger 1021. Furthermore, the contact 2 in this embodiment is a one-piece molded part and is provided with a stop step 23 arranged toward the base 1. When the contact 2 is driven by the test rod 3 to withdraw to the position of the base 1, the stop step 23 can engage with the end face of the second threaded section 12 of the base 1 to prevent the contact 2 from falling out of the base 1.

[0030] The test device also includes a positioning component for positioning the contact 2 on the base 1 when not testing and for positioning the test rod 3 when testing, specifically as follows: Figure 2 and Figure 4 As shown, the positioning assembly includes a positioning cap 4 for removably connecting to the base 1. The positioning cap 4 includes a sleeve 41 and a stop wall 42 located at one end of the sleeve 41. The inner wall of the sleeve 41 is threaded so as to be mated with the first threaded section 11 of the base 1. The stop wall 42 is used to engage with the end face of the test rod 3. Therefore, during the test process, even if the vibration force generated by the moment of opening and closing the circuit breaker is transmitted to the test rod 3, the test rod 3 cannot move (it cannot move upward in the figure), and thus the contact 2 connected to the test rod 3 cannot be separated from the spring contact finger 1021. Compared with the existing method of positioning based solely on static friction, the end face stop can more reliably prevent the test rod 3 from moving, ensuring that the contact 2 and the spring contact finger 1021 are in reliable contact, thereby ensuring that the test of the mechanical characteristics of the circuit breaker can be carried out smoothly.

[0031] Furthermore, the retaining wall 42 is provided with a screw through-hole corresponding to the internally threaded hole 32 on the end face of the test rod 3. The positioning assembly also includes a connecting screw 5 for passing through the screw through-hole in the retaining wall 42 and connecting with the internally threaded hole 32 on the end face of the test rod 3. The connecting screw 5 connects the positioning cap 4 to the test rod 3, thereby enhancing the positioning effect of the test rod 3. At the same time, the head of the connecting screw 5 constitutes a pressing structure for pressing the test lead 105 against the positioning cap 4. The connecting screw 5, the positioning cap 4, and the test rod 3 are all made of conductive materials, thus achieving electrical continuity between the test lead 105 and the test rod 3.

[0032] Furthermore, to facilitate tightening the test lead 105 and prevent the connecting screw 5 from loosening, the test device further includes a washer. During testing, the washer is sleeved over the outside of the connecting screw 5 and is compressed between the head of the connecting screw 5 and the positioning cap 4. The test lead 105 is compressed between the washer and the positioning cap 4. Specifically, in this embodiment, the washer includes a flat washer 6 and a spring washer 7, which has a better anti-loosening effect.

[0033] After the test is completed, the positioning cap 4 must be removed first, otherwise the test rod 3 cannot move outward. During the specific operation, first remove the connecting screw 5, then unscrew the positioning cap 4, then pull out the test rod 3 and bring out the contact 2. When the end of the contact 2 is exposed from the base body 1, specifically after the stopping step 23 is stopped by the end face of the base body 1, that is, after the contact 2 can no longer move outward, remove the test rod 3, and then install the positioning cap 4 on the base body 1. Figure 6 As shown, a connecting screw 5 is passed through the screw hole on the stop wall 42 of the positioning cap 4 and connected to the screw hole 21 on the contact 2 to achieve the connection between the contact 2 and the positioning cap 4, so that the contact 2 is positioned on the base 1 to prevent it from falling into the circuit breaker.

[0034] Therefore, the positioning cap 4 and the connecting screw 5 have two functions. When testing, they are connected to the test rod 3. The stop wall 42 of the positioning cap 4 cooperates with the end face of the test rod 3 to prevent the test rod 3 from moving. At this time, the screw through-hole on the stop wall 42 corresponds to the internal threaded hole 32 at the end of the test rod 3; when not testing, they are connected to the contact 2 to position the contact 2 on the seat body 1. At this time, the screw through-hole on the stop wall 42 corresponds to the screw hole 21 on the contact 2. The positioning components for positioning the contact 2 and the test rod 3 are the same set of components, with a small number of parts, easy installation, and avoidance of loss of parts.

[0035] Of course, in order to ensure the stability of the position of the contact 2 when not testing and prevent the connecting screw 5 from loosening, a flat washer 6 and a spring washer 7 are also sleeved on the outside of the connecting screw 5. The flat washer 6 and the spring washer 7 are also pressed between the head of the connecting screw 5 and the positioning cap 4. Therefore, the washer also has two functions, which can loosen the connecting screw 5 both during testing and not testing.

[0036] In addition, Figure 6 As shown, the testing device also includes a protective cap 8. When not testing, the protective cap 8 is fixed to the circuit breaker end cover 103 by fixing screws 9. The protective cap 8 covers the outside of the base 1, the positioning cap 4, and the connecting screws 5. A sealing ring is provided between the protective cap 8 and the circuit breaker end cover 103. The protective cap 8 serves as a second line of defense to prevent the insulating gas in the circuit breaker from leaking to the outside when the seal between the base 1 and the circuit breaker end cover 103 fails or when the seal between the base 1 and the contact 2 fails.

[0037] It should be noted that when the circuit breaker is in the testing state, insulating gas of a certain pressure will be filled inside as required. Therefore, after the test, when the test rod 3 brings the contact 2 out to the end to expose the base body 1, under the friction of the sealing ring between the contact 2 and the base body 1, and under the pressure of the insulating gas inside the circuit breaker, there is no need to operate the contact 2. The contact 2 can remain on the base body 1 and keep the stopping step 23 stopped by the base body 1. When installing the positioning cap 4 later, the positioning cap 4 can be directly screwed until it contacts the end face of the contact 2. Then, when installing the connecting screw 5, the connecting screw 5 can be directly passed through the stopping wall of the positioning cap 4 to connect with the contact 2 until the head of the connecting screw 5 presses the washer.

[0038] Figure 6 The state shown is the state of the circuit breaker when it leaves the factory. For transportation safety, the circuit breaker is not filled with high-pressure gas, but with slightly positive-pressure insulating gas. Due to the inevitable bumps during transportation, it is very necessary to connect the contact 2 to the positioning cap 4 with the connecting screw 5. Otherwise, relying solely on the friction of the sealing ring and the pressure of the slightly positive pressure, the contact 2 is very likely to fall into the circuit breaker, which will cause great trouble to subsequent use and testing.

[0039] After the circuit breaker is transported to the site, it may be necessary to test the mechanical properties before normal use and during use. When testing is required, first remove the protective cap 8, then remove the connecting screws 5 and the positioning cap 4. At this time, the circuit breaker is already filled with high-pressure insulating gas. The friction of the sealing ring and the pressure of the insulating gas can keep the contact 2 on the base 1. Then connect the test rod 3 to the contact 2. Figure 2 、 Figure 4 and Figure 5 As shown, the contact 2 is sent into the circuit breaker through the test rod 3 and contacts the spring contact finger 1021 on the transmission box 102. Then, the positioning cap 4, connecting screw 5, flat washer 6 and spring washer 7 are installed, and the test wire 105 is pressed between the flat washer 6 and the positioning cap 4. Then, the mechanical properties tester 104 can be used to measure the mechanical properties of the two fractures and the synchronicity of the two fractures.

[0040] Example 2 of the circuit breaker mechanical characteristics testing device of the present invention: like Figure 7 and Figure 8 As shown, this embodiment differs from Example 1 in that a stud 24 is provided at the end of the contact 2, and a corresponding screw hole (not shown) is provided at the end of the test rod 3, thereby achieving a detachable connection between the contact 2 and the test rod 3. To facilitate positioning of the contact 2 when not under test, the perforations in the retaining wall of the positioning cap 4 serve as stud holes. When installing the positioning cap 4, the stud 24 on the contact 2 passes through the retaining wall of the positioning cap 4. In this case, the testing device also includes a nut 100 connected to the stud 24, thereby connecting the contact 2 to the positioning cap 4. To prevent the nut 100 from loosening, a flat washer 6 and a spring washer 7 are sleeved over the stud 24, which are compressed between the nut 100 and the positioning cap 4.

[0041] When testing is required, the nut 100, flat washer 6, and spring washer 7 are removed, followed by the positioning cap 4. The test rod 3 is connected to the contact 2, and the contact 2 is inserted into the circuit breaker via the test rod 3 and connected to the transmission case. The positioning cap 4 is then installed on the base 1, and the retaining wall of the positioning cap 4 blocks the end face of the test rod 3 to prevent movement. Furthermore, in this embodiment, the end face of the test rod 3 is provided with an externally threaded rod 33. Therefore, when installing the positioning cap 4, the externally threaded rod 33 must be passed through the stud perforation in the positioning cap 4 and then connected to the nut 100, enhancing the positioning of the test rod 3. Furthermore, the externally threaded rod 33 is sleeved with a flat washer 6 and a spring washer 7, which are compressed between the nut 100 and the positioning cap 4 to prevent the nut 100 from loosening. At the same time, the test lead can still be compressed between the flat washer 6 and the positioning cap 4 to achieve electrical continuity between the test lead and the test rod 3.

[0042] Example 3 of the circuit breaker mechanical characteristics testing device of the present invention: like Figure 9 and Figure 10 As shown, the difference between this embodiment and Example 1 lies in the structure and installation method of positioning cap 4. The positioning cap 4 in this embodiment includes a sleeve 41, a stop wall 42 located at one end of the sleeve 41, and a flange 43 located at the other end of the sleeve 41 and extending outward. In this embodiment, the inner wall of the sleeve 41 is not threaded, and the corresponding base 1 does not need to be provided with two threaded sections. The base 1 has only one threaded section for connection with the circuit breaker end cover 103. The positioning cap 4 covers the entire base 1, and the flange 43 is fixed to the circuit breaker end cover 103 via mounting screws 10, achieving a detachable connection between the positioning cap 4 and the circuit breaker end cover 103.

[0043] In other embodiments of the circuit breaker mechanical characteristic testing device, the object tested by the testing device may also be a single-break circuit breaker.

[0044] In other embodiments of the circuit breaker mechanical characteristics testing device: depending on the specific structure of the circuit breaker, the conductor component in the circuit breaker that is in contact with the contact can also be other components, such as the high-voltage circuit breaker guide seat mentioned in CN202119635U.

[0045] In other embodiments of the circuit breaker mechanical characteristic testing device: the structure of the contact may be the same as that in the prior art, including a separate mounting base and a measuring head.

[0046] In other embodiments of the circuit breaker mechanical characteristic testing device: the insertion portion of the contact may also be in contact with and conductive with a watch strap contact finger installed in the conductive hole.

[0047] In other embodiments of the circuit breaker mechanical characteristics testing device: the contact may not include an inserting portion, and the end surface of the contact directly contacts the conductor component.

[0048] In other embodiments of the circuit breaker mechanical characteristics testing device, the washer may only include a flat washer.

[0049] In other embodiments of the circuit breaker mechanical characteristic test device: the test device does not include a washer, and the head of the nut or connecting screw directly presses the positioning cap when not testing, and the head of the nut or connecting screw directly presses the test wire during testing.

[0050] In other embodiments of the circuit breaker mechanical characteristic test device, it is no longer necessary to use a nut or the head of a connecting screw to compress the test lead. Instead, the test lead can be fixed to the positioning cap by another compression screw. Since the retaining wall of the positioning cap is retained by the end face of the test rod, the positioning cap and the test rod are in contact and conduction, so that test leads fixed at other positions of the positioning cap can also be connected to the test rod.

[0051] In other embodiments of the circuit breaker mechanical characteristics testing device: no external threaded rod or internal threaded hole is provided on the end face of the test rod away from the end connected to the contact; when installing the positioning cap before testing, only the stopping wall of the positioning cap is engaged with the end face of the test rod, and there is no other connection relationship, and no nut or connecting screw is installed. However, when not testing, in addition to installing the positioning cap, the nut or connecting screw still needs to be installed to connect the contact to the positioning cap.

[0052] Embodiment 1 of the method for testing the mechanical characteristics of a circuit breaker of the present invention is: Combine Figures 1 to 6As shown, before testing, contact 2 is inserted into the circuit breaker via a test rod 3 connected to contact 2, establishing electrical contact with the conductor component (spring contact finger 1021 on transmission case 102). A positioning cap 4 is then installed on the test device's base 1. The end face of test rod 3 is retained by a retaining wall 42 of positioning cap 4. A connecting screw 5 passes through retaining wall 42 of positioning cap 4 and connects with an internally threaded hole 32 on the end face of test rod 3, thereby positioning test rod 3 and preventing contact 2 from disengaging from spring contact finger 1021 during testing. Simultaneously, the head of connecting screw 5 presses test lead 105, connected to the tester, against positioning cap 4, establishing electrical contact between test lead 105 and test rod 3. Furthermore, a flat washer 6 and a spring washer 7 are mounted on connecting screw 5, with flat washer 6 compressing test lead 105.

[0053] After the test is completed, first remove the connecting screw 5, flat washer 6, and spring washer 7, then remove the positioning cap 4. Then pull out the test rod 3 and the contact 2. When the end of the contact 2 is exposed from the base 1, remove the test rod 3 and install the positioning cap 4 on the base 1. Then, use the connecting screw 5 to pass through the retaining wall of the positioning cap 4 and connect it to the screw hole 21 on the contact 2 to position the contact 2 on the base 1. To prevent the connecting screw 5 from loosening, similarly install a flat washer 6 and spring washer 7 on the connecting screw 5. When it is necessary to test again, remove the connecting screw 5 and positioning cap 4, connect the contact 2 to the test rod 3, and repeat the above steps.

[0054] The present invention adopts an end face stop method to position the test rod 3. During the test process, even if the vibration force generated at the moment of opening and closing the circuit breaker is transmitted to the test rod 3, the test rod 3 cannot move, and the contact 2 connected to the test rod 3 cannot separate from the spring contact finger 1021. Compared with the positioning method relying solely on static friction in the prior art, the end face stop can more reliably prevent the test rod from moving, ensure that the contact and the spring contact finger are in reliable contact, and thus ensure that the test of the mechanical characteristics of the circuit breaker can be carried out smoothly.

[0055] Embodiment 2 of the method for testing the mechanical characteristics of a circuit breaker in the present invention is: like Figure 7 and Figure 8 As shown, the difference from Example 1 is that after the test is completed and the positioning cap 4 is installed, the stud 24 at the end of the contact 2 passes through the stop wall of the positioning cap 4 and is connected to the nut 100, so that the contact 2 is positioned on the base 1. To prevent the nut 100 from loosening, a flat washer 6 and a spring washer 7 are sleeved on the stud 24. Before the test, when the positioning cap 4 is installed, the stop wall of the positioning cap 4 is engaged with the end face of the test rod 3. At the same time, the externally threaded rod 33 on the end face of the test rod 3 passes through the stop wall of the positioning cap 4 and is connected to the nut 100. Similarly, a flat washer 6 and a spring washer 7 are sleeved on the externally threaded rod 33, and the flat washer 6 can also be used to compress the test wire.

[0056] Embodiment 3 of the method for testing the mechanical characteristics of a circuit breaker in the present invention is: like Figure 9 and Figure 10 As shown, different from Example 1, the positioning cap 4 has a flange 43 , which is fixed to the circuit breaker end cover 103 by mounting screws 10 , thereby achieving a detachable connection between the positioning cap 4 and the circuit breaker end cover 103 .

[0057] In other embodiments of the circuit breaker mechanical characteristic testing method: the test wire may be directly compressed by the head or nut of the connecting screw without providing a washer.

[0058] In other embodiments of the circuit breaker mechanical characteristic testing method, it is no longer necessary to use a nut or the head of a connecting screw to compress the test lead. Instead, the test lead can be fixed to the positioning cap by another compression screw. Since the retaining wall of the positioning cap is retained by the end face of the test rod, the positioning cap and the test rod are in contact and conduction, so that test leads fixed at other positions of the positioning cap can also be connected to the test rod.

[0059] In other embodiments of the circuit breaker mechanical characteristic testing method: no external threaded rod or internal threaded hole is provided on the end face of the test rod away from the end connected to the contact; when the positioning cap is installed before testing, only the retaining wall of the positioning cap is engaged with the end face of the test rod, and there is no other connection relationship, that is, no nut or connecting screw is installed; when not testing, in addition to installing the positioning cap, the nut or connecting screw still needs to be installed to connect the contact to the positioning cap.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A circuit breaker mechanical characteristics test method, characterized in that: Before the test, the contact is sent into the circuit breaker through the test rod connected to the contact to conduct with the conductor part, and then a positioning cap is installed on the circuit breaker end cover or the base body of the test device. The end face of the test rod is stopped by the stopping wall of the positioning cap to prevent the contact from separating from the conductor part during the test; after the test is completed, the positioning cap is removed first, and then the test rod is pulled out and the contact is taken out. When the end of the contact is exposed from the base body, the test rod is removed, and then the positioning cap is installed on the circuit breaker end cover or base body, so that the stud on the contact passes through the stopping wall and is connected with a nut, or a screw is passed through the stopping wall and connected to the screw hole on the contact to position the contact on the base body. When testing is required, the nut or screw is removed and the positioning cap is removed to connect the contact to the test rod.

2. The circuit breaker mechanical characteristics testing method according to claim 1, characterized in that: When installing the positioning cap before testing, the external threaded rod on the end face of the test rod passes through the positioning cap and is connected to the nut, or the screw passes through the positioning cap and is connected to the internal threaded hole on the end face of the test rod.

3. The circuit breaker mechanical characteristics testing method according to claim 2, characterized in that: Before testing, the test lead connected to the tester is pressed against the positioning cap by the head of the nut or screw to achieve conduction between the test lead and the test rod.

4. A circuit breaker mechanical characteristics test device, comprising a base, contacts, and a test rod connected to the contacts during testing and removed when not testing, wherein one end of the contact and the test rod is provided with a screw hole, and the other end is provided with a stud for mating with the screw hole. The device also includes a positioning assembly for positioning the contacts on the base when not testing and for positioning the test rod during testing, wherein the positioning assembly includes a positioning cap for detachable connection to the base or circuit breaker end cover, and is characterized in that: The positioning cap has a stop wall for cooperating with the end face of the test rod; the stop wall is provided with a stud through-hole for the stud on the contact to pass through or a screw through-hole corresponding to the screw hole on the contact, and the positioning assembly also includes a nut for connecting to the stud on the contact or a screw passing through the stop wall and connected to the screw hole on the contact.

5. The circuit breaker mechanical characteristics testing device according to claim 4, characterized in that: An external threaded rod or an internal threaded hole is provided on the end face of the test rod. During testing, the external threaded rod passes through the stud hole on the positioning cap and is connected to the nut, or the screw passes through the screw hole on the positioning cap and is connected to the internal threaded hole.

6. The circuit breaker mechanical characteristics testing device according to claim 5, characterized in that: During testing, the head of the nut or screw forms a pressing structure for pressing the test wire connected to the tester onto the positioning cap.

7. The circuit breaker mechanical characteristics testing device according to claim 5 or 6, characterized in that: The circuit breaker mechanical characteristics testing device also includes a washer, which is used to be sleeved on the outside of the screw or externally threaded rod and compressed between the head of the screw and the positioning cap or between the nut and the positioning cap during testing. The washer is also used to be sleeved on the outside of the screw or stud and compressed between the head of the screw and the positioning cap or between the nut and the positioning cap when not testing.

8. The circuit breaker mechanical characteristics testing device according to claim 7, characterized in that: The washers include flat washers and spring washers.

9. The circuit breaker mechanical characteristics testing device according to any one of claims 4 to 6, characterized in that: The contact includes an inserting portion for being inserted into a conductive hole of a conductor component and contacting and conducting with a contact finger installed in the conductive hole.

10. The circuit breaker mechanical characteristics testing device according to any one of claims 4 to 6, characterized in that: The contact is an integrally formed part.

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