Disassembly-free adjustment of an insulating pull rod mechanism and method

Abstract

The application relates to a disassembly-free adjusting insulation pull rod mechanism, which comprises an insulation pull rod body coated with reinforced nylon and glass fiber material, a metal adjusting head assembly and a thread anti-loosening mechanism, an overtravel spring, a sealing cover with external threads and a metal rod with steps and external threads penetrating through the sealing cover. The metal adjusting head assembly comprises a base, a connecting rod, a pin, an adjusting head and is divided into two parts, which can rotate at any angle. The application relates to a disassembly-free adjusting insulation pull rod mechanism method, which comprises the following steps: S1, assembling the insulation pull rod assembly; S2, accurately adjusting the metal adjusting head assembly to a theoretically designed position; S3, completing assembly; S4, according to mechanical characteristic test data, without disassembling the insulation pull rod assembly, adjusting the movable part of the metal adjusting head assembly until a desired position; and S5, completing the mechanical characteristic test of the pole-mounted circuit breaker.

Description

Technical Field

[0001] This application relates to the field of pole-mounted circuit breaker technology, and more specifically, to an insulating tie rod mechanism and method that allows for adjustment without disassembly. Background Technology

[0002] In pole-mounted circuit breaker products, the insulating rod is used to transmit the power generated by the pole-mounted circuit breaker drive mechanism to the arc-extinguishing chamber to switch the circuit on and off, and to provide reliable electrical isolation when the circuit is switched on or off. The insulating rod is generally rod-shaped, with metal adjusting heads at both ends that connect to the pole-mounted circuit breaker drive mechanism and the moving contact of the arc-extinguishing chamber, respectively, and a metal rod with external threads. An overtravel spring is installed in the cavity at one end of the insulating rod. In the prior art, the metal adjusting head of the insulating rod and its adjusting thread structure are integrated, and the metal adjusting head has installation direction requirements. If the position of the metal adjusting head deviates from the design position during assembly, the entire metal adjusting head needs to be adjusted at least half a turn, or 180°. The metal adjusting head changes at least 0.5 times the thread pitch along the thread axis, making precise adjustment impossible. In existing technologies, to minimize assembly position errors of metal adjusting heads, the mating threads of these heads are often fine-pitch threads. Taking M10 fine-pitch threads as an example, their standard pitch is 1.0mm. The metal adjusting head can only be adjusted in increments of 0.5 times the pitch (0.5mm). If, during assembly, measurements show the metal adjusting head is -0.3mm from the design target position, at least half a turn of the thread is required for adjustment, increasing the adjusting head height by 0.5mm. This then reduces the distance from the design target height to +0.2mm, making precise adjustment impossible. If standard coarse-pitch threads are used, such as M10 coarse-pitch threads with a pitch of 1.75mm, the adjusting head can only be adjusted in increments of 0.5 times the pitch (0.75mm), making it even more difficult to reach the design position. Furthermore, using fine-pitch threads also leads to reduced shear force tolerance and increased costs. The three insulating tie rods required for the three-phase poles of the pole-mounted circuit breaker all encounter the same problem. Furthermore, the three insulating tie rods are mutually constrained during assembly, resulting in inconsistent assembly positions and affecting the test results of the mechanical characteristic parameters of the pole-mounted circuit breaker.

[0003] During the mechanical characteristic test of pole-mounted circuit breakers, if the mechanical characteristic test fails, the existing technology requires removing the insulating tie rod from its installation position, adjusting the position of the metal adjusting head, and then reinstalling it into the pole-mounted circuit breaker. Then the mechanical characteristic test is repeated. Because the adjusting head cannot be precisely adjusted, this process of testing, disassembling, adjusting, assembling, and testing is sometimes repeated, which is very inefficient. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides an insulating pull rod mechanism and method that allows for adjustment without disassembly.

[0005] The objective of this application can be achieved through the following technical solution: a high-strength insulating pull rod that can be precisely adjusted without disassembly, wherein the body is externally covered with reinforced nylon and fiberglass materials; one end of the body has a metal rod with external threads, and the metal rod is equipped with a metal adjusting head assembly and its threaded anti-loosening mechanism; one end of the body has a cavity with internal threads, and an overtravel spring is placed in the cavity, the overtravel spring being sealed in the cavity by a sealing cap with external threads and a metal rod with steps and external threads passing through the sealing cap.

[0006] The adjusting head assembly includes a base, a connecting rod, a pin, and an adjusting head. The connecting rod passes through the stepped through hole in the base and is inserted into the hole at the bottom of the adjusting head, and is connected to the adjusting head by the pin. The adjusting head and the base can rotate relative to each other at any angle.

[0007] The base has internal threads in the stepped through hole, and a flat surface on the outer surface of the base for easy clamping.

[0008] The connecting rod has a step at one end and a pin hole at the other end.

[0009] The adjusting head has a hole at the bottom and holes on its side wall for connecting to the drive mechanism of the pole-mounted circuit breaker and pin holes for connecting to the connecting rod.

[0010] The cavity with internal threads has semi-circular holes evenly distributed around the circumference of the internal threads. The cavity can be a physical cavity or a non-metallic cavity, such as a plastic cavity.

[0011] The sealing cap with external threads has semi-circular holes evenly distributed around the external threads, and a hole in the middle that matches the step shape of the stepped metal rod.

[0012] The stepped metal rod has an external thread at one end and a step at the other end. The shape of the step matches the shape of the opening of the sealing cap, and there is a flat surface on the outer surface of the metal rod for easy clamping.

[0013] This application provides a method for adjusting an insulating pull rod without disassembly, comprising the following steps:

[0014] S1: Assemble the overtravel spring, the sealing cap with external threads, the metal rod with steps and external threads, the metal adjusting head assembly and its anti-loosening mechanism, etc., onto the insulating tie rod body to form the insulating tie rod assembly;

[0015] S2: After connecting the insulating tie rod assembly to the arc-extinguishing chamber of the pole-mounted circuit breaker, adjust the moving part of the metal adjusting head assembly according to the measurement results of the position of the metal adjusting head assembly, precisely adjust the metal adjusting head assembly to the theoretical design position, and tighten the thread anti-loosening mechanism of the metal adjusting head assembly.

[0016] S3: Connect the insulating tie rod assembly to the pole-mounted circuit breaker drive mechanism, assemble other components, and complete the pole-mounted circuit breaker assembly.

[0017] S4: Perform mechanical characteristic tests on the pole-mounted circuit breaker. Based on the comparison results of the test data and the mechanical characteristic parameter values ​​of the pole-mounted circuit breaker, without disassembling the insulating tie rod assembly, loosen the threaded anti-loosening mechanism of the metal adjusting head assembly on the insulating tie rod assembly, adjust the moving part of the metal adjusting head assembly to the desired position, and tighten the threaded anti-loosening mechanism of the metal adjusting head assembly.

[0018] S5: Complete the mechanical characteristic test of the pole-mounted circuit breaker.

[0019] The beneficial technical effects of this application are as follows: In the metal adjusting head assembly of the insulating pull rod, the adjusting head and the base are connected by a connecting rod and a pin, and the whole assembly is divided into upper and lower parts. The adjusting head and the base can rotate relative to each other at any angle. During assembly, the metal adjusting head assembly can be precisely adjusted to the theoretical design position, which solves the problem of inaccurate position adjustment in the prior art where the adjusting head and adjusting thread structure are integrated, and the adjusting head can only be adjusted to a minimum of 0.5 times the thread pitch. Precise adjustment of the metal adjusting head to the theoretical design position can greatly improve the pass rate of subsequent mechanical property tests and reduce the number of adjustments required for the metal adjusting head of the insulating pull rod. Moreover, it solves the problem of reduced force and increased cost caused by the use of fine thread in the prior art, and allows the use of standard coarse thread with greater force and lower cost.

[0020] In addition, the upper and lower parts of the metal adjusting head assembly of this application can rotate relative to each other at any angle. When the mechanical characteristic test of the pole-mounted circuit breaker fails and the position of the insulating tie rod adjusting head needs to be adjusted, the position can be easily adjusted without removing the insulating tie rod from the installation position. This solves the problem of low production efficiency caused by the need for repeated testing, disassembly, adjustment, assembly and testing of the insulating tie rod in the prior art, and greatly improves production efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. Those skilled in the art can obtain other related transformations and variations based on these drawings to obtain equivalent technical solutions without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall assembly of this application;

[0023] Figure 2 This is a schematic diagram of the insulating tie rod body of this application;

[0024] Figure 3 This is a schematic diagram of the metal adjustment head assembly of this application;

[0025] Figure 4This is a schematic diagram of the sealing cap of this application;

[0026] Figure 5 This is a schematic diagram of the metal rod with steps in this application.

[0027] The components represented by the numbers in the attached diagram are as follows: 1. Insulating pull rod body with external reinforced nylon and fiberglass material; 2. Nut in the anti-loosening mechanism of the adjusting head assembly; 3. Spring washer in the anti-loosening mechanism of the adjusting head assembly; 4. Metal adjusting head assembly; 5. Overtravel spring; 6. Sealing cap with external thread; 7. Metal rod with a step at one end and external thread at the other end; 11. Metal rod with external thread at one end of the body; 12. Reinforced nylon and fiberglass material externally covering the body; 13. Cavity with internal thread at one end of the body; 131. Semicircular holes evenly distributed circumferentially along the edge of the internal thread of cavity 13; 132. Internal thread on cavity 13; 41. Adjusting head; 42. Pin; 43. 44. Connecting rod; 411. Hole on the side wall of the adjusting head for connection to the drive mechanism of the pole-mounted circuit breaker; 412. Pin hole on the side wall of the adjusting head for connection to the connecting rod; 413. Hole at the bottom of the adjusting head; 441. Flat surface on the outer surface of the base for easy clamping; 442. Stepped through hole inside the base; 443. Internal thread in the stepped through hole of the base; 61. External thread on the sealing cover; 62. Semicircular holes evenly distributed around the circumference of the external thread on the sealing cover; 63. Irregular hole in the middle of the sealing cover; 71. External thread at one end of the metal rod; 72. Flat surface on the outer surface of the metal rod 7 for easy clamping; 73. Stepped structure at one end of the metal rod 7 that matches the shape of the opening 63 of the sealing cover. Detailed Implementation

[0028] The following are specific embodiments of this application, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of this application. However, this application is not limited to these embodiments.

[0029] It should be noted that in the description of this application, the terms "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "center," "longitudinal," "transverse," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0030] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] like Figure 1 As shown, an insulating pull rod that can be precisely adjusted without disassembly includes an insulating pull rod body 1. To meet the requirements for strength and electrical insulation, the insulating pull rod body 1 is covered with reinforced nylon and glass fiber material 12. The outer surface has a grid-like shape composed of transverse intervals and longitudinal reinforcing ribs. The creepage distance is precisely calculated, and even when the creepage distance is measured along the shortest length, it still meets the electrical insulation performance specified in the standard.

[0034] Combination Figure 1 , Figure 2 As shown, one end of the insulating rod body 1 is fitted with a metal rod 11 with external threads. The other end of the metal rod 11, which is embedded in the insulating material, can be threaded or have other measures such as backlashes or patterns to increase the pull-out force. In this embodiment, both ends of the metal rod 11 are threaded and have a symmetrical structure. During production, it is not necessary to select the installation direction, which facilitates production. At the same time, the threads embedded in the insulating material can also increase the pull-out force to prevent the metal rod 11 from being pulled out of the insulating material. The metal rod 11 can also be connected to the insulating rod body in other ways.

[0035] like Figure 1 As shown, the metal rod 11 with external threads at one end of the insulating tie rod body is equipped with a metal adjusting head assembly 4 and an adjusting head assembly thread anti-loosening mechanism. In this example, the anti-loosening mechanism uses a combination of nut 2 and spring washer 3. Other forms and combinations of thread anti-loosening mechanisms can also be used, such as double nuts, locking nuts, locking nuts, stop washers, internal tooth locking washers, etc.

[0036] Combination Figure 1 , Figure 2 As shown, one end of the insulating pull rod body 1 has a cavity 13 with internal threads. This cavity can be a metal cavity or a plastic cavity, and can be embedded in insulating material or directly injection molded from insulating material. An overtravel spring 5 is placed inside the cavity 13 with internal threads. The overtravel spring 5 is sealed inside the cavity 13 by a sealing cap 6 with external threads and a metal rod 7 with steps and external threads passing through the sealing cap 6, which can prevent foreign objects from entering the cavity and affecting the operation of the overtravel spring.

[0037] The externally threaded metal rod 11, the metal adjusting head assembly 4 and its threaded anti-loosening mechanism, the internally threaded cavity 13 and its sealing cover 6, and the externally threaded metal rod 7 can be installed at any end of the insulating rod according to actual needs, allowing for multiple combinations without affecting the actual performance of the insulating rod. In this embodiment, the metal adjusting head assembly and its threaded anti-loosening mechanism are installed on the metal rod at the end opposite to the overtravel spring end.

[0038] like Figure 3 As shown, the adjusting head assembly 4 includes an adjusting head 41, a pin 42, a connecting rod 43, and a base 44. The adjusting head 41 has a hole 413 at its bottom, and the base 44 has a stepped through hole 442. The connecting rod 43 has a step and passes through the stepped through hole 442 of the base 44, inserting into the hole 413 at the bottom of the adjusting head 41. It is connected to the pin hole 412 on the side wall of the adjusting head 41 via the pin 42. The adjusting head 41 and the base 44 can rotate relative to each other at any angle. The outer surface of the base 44 has a flat surface 441 for easy clamping, and the stepped through hole 442 has an internal thread 443. The adjusting head assembly is connected to the insulating pull rod body 11 with external threads via the internal thread 443 of the base 44. The side wall of the adjusting head has a round hole 411 for connection to the pole-mounted circuit breaker drive mechanism. According to the assembly position requirements, the metal adjusting head assembly 4 can be rotated up and down along the thread to adjust its position.

[0039] Because the adjusting head and base can rotate relative to each other at any angle, the problem that the adjusting head can only be adjusted to a minimum of 0.5 times the pitch in the existing technology is solved. This allows the metal adjusting head assembly to be precisely adjusted to the specified position. After the adjustment is in place, the upper and lower positions of the adjusting head assembly are locked by tightening the threaded anti-loosening mechanism nut 2 and spring washer 3, which ensures the assembly consistency of the three-phase insulating tie rod of the pole-mounted circuit breaker, thereby ensuring the mechanical characteristic parameters of the pole-mounted circuit breaker.

[0040] like Figure 4 As shown, the sealing cap 6 has an external thread 61 on the outside, and semi-circular holes 62 are evenly distributed along the circumference of the thread, usually more than 3 in number, and an irregular hole 63 in the middle, which matches the shape of the step 73 of the metal rod 7.

[0041] Combination Figure 1 , Figure 4 , Figure 5 As shown, the metal rod 7 has an external thread 71, a flat surface 72 on its outer surface for easy clamping, and a step 73 that matches the shape of the irregular hole 63 of the sealing cover 6. The metal rod 7 passes through the irregular hole 63 of the sealing cover 6. The step 73 on the metal rod 7 matches the shape of the irregular hole 63 of the sealing cover 6. The step 73 on the metal rod 7 can drive the sealing cover 6 to rotate and be screwed into the thread of the cavity 13. The internal thread 132 of the cavity 13 has semi-circular holes 131 evenly distributed around the circumference, and the external thread of the sealing cover 6 has semi-circular holes 62 evenly distributed around the circumference. The evenly distributed semi-circular holes facilitate the adjustment of the installation position of the sealing cover 6. When there are differences in the installation position, simply rotate the sealing cap 6 by a small angle to align it with the nearest semi-circular hole in the cavity 13. By aligning the semi-circular hole 131 on the internal thread of the cavity 13 and the semi-circular hole 62 on the external thread of the sealing cap 6, a complete circular hole is formed, ensuring that the sealing cap 6 is installed in place. After the sealing cap 6 is installed in place, at least one or more rivets can be riveted into the multiple circular holes aligned between the internal thread of the cavity 13 and the external thread of the sealing cap 6. The purpose of the rivets is to prevent the threads of the sealing cap 6 from loosening. Other methods to prevent the threads of the sealing cap 6 from loosening can also be used, such as spot welding, bonding, punching, threading steel wire, cotter pins, etc.

[0042] This embodiment also provides a method for adjusting an insulating pull rod mechanism without disassembly, comprising the following steps:

[0043] S1: Assemble the overtravel spring, sealing cap, metal rod with a thread on one end and a step on the other, metal adjusting head assembly and its anti-loosening mechanism, etc., onto the insulating tie rod body to form an insulating tie rod assembly;

[0044] S2: After connecting one end of the insulating tie rod assembly to the arc-extinguishing chamber of the pole-mounted circuit breaker, precisely adjust the metal adjusting head assembly to the theoretical design position and tighten the threaded anti-loosening mechanism of the metal adjusting head assembly. This step can be done using measuring fixtures or tools to measure the distance from the reference point to the measuring feature of the metal adjusting head assembly. Adjust the position of the metal adjusting head assembly according to the difference between the measurement result and the theoretical design position. Alternatively, positioning fixtures or other tools can be used for positioning to precisely adjust the metal adjusting head assembly to the theoretical design position. Precisely adjusting the metal adjusting head assembly to the theoretical design position can greatly improve the first-pass yield of subsequent mechanical characteristic tests and reduce the number of adjustments required for the insulating tie rod metal adjusting head assembly.

[0045] S3: Connect the insulating tie rod to the pole-mounted circuit breaker drive mechanism, assemble other components, and complete the pole-mounted circuit breaker assembly; In this step, both ends of the insulating tie rod have threaded metal rods, and the metal adjusting head assembly can be installed at either end of the insulating tie rod without affecting the actual use effect of the insulating tie rod. In this embodiment, the metal adjusting head assembly and its threaded anti-loosening mechanism are installed on the metal rod on the opposite side of the overtravel spring end.

[0046] S4: Perform mechanical characteristic tests on the pole-mounted circuit breaker. Based on the comparison results of the test data and the mechanical characteristic parameters of the pole-mounted circuit breaker, determine the adjustment direction and distance of the metal adjusting head assembly of the insulating tie rod. Maintain the connection between the insulating tie rod and other mechanisms of the pole-mounted circuit breaker without disassembly. Loosen the threaded anti-loosening mechanism of the metal adjusting head assembly on the insulating tie rod, adjust the metal adjusting head assembly to the desired position, and tighten the threaded anti-loosening mechanism of the metal adjusting head.

[0047] S5: Complete the mechanical property test.

[0048] The above embodiments are illustrative of specific implementations of this application, and not limitations thereof. The terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] It is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can combine, modify, substitute, and alter the different embodiments or examples described in this specification and the features of different embodiments or examples without departing from the spirit and scope of this application to obtain corresponding equivalent technical solutions. Therefore, all equivalent technical solutions should be included in the patent protection scope of this application.

Claims

1. An insulating pull rod whose position can be precisely adjusted without disassembly, characterized in that, include: An insulated tie rod body, the body being externally covered with reinforced nylon and glass fiber materials; One end of the main body has a metal rod with external threads, and the metal rod is equipped with a metal adjusting head assembly and its threaded anti-loosening mechanism; one end of the main body has a cavity with internal threads, and an overtravel spring is placed in the cavity. The overtravel spring is sealed in the cavity by a sealing cap with external threads and a metal rod with steps and external threads passing through the sealing cap.

2. The metal adjusting head assembly according to claim 1, characterized in that, include: The system comprises a base, a connecting rod, a pin, and an adjusting head. The base has a stepped through hole with internal threads, and its outer surface has a flat surface for easy clamping. One end of the connecting rod has a step, and the other end has a pin hole. The adjusting head has a hole at its bottom and holes on its side wall for connecting to the pole-mounted circuit breaker drive mechanism and for connecting to the connecting rod. The connecting rod passes through the stepped through hole in the base and is inserted into the hole at the bottom of the adjusting head, and is connected to the adjusting head by a pin. The adjusting head and the base can rotate relative to each other at any angle.

3. The sealing cap with external threads according to claim 1, characterized in that, It has an irregularly shaped hole in the middle.

4. The metal rod with steps and external threads according to claim 1, characterized in that, One end has an external thread, and the other end has a step. The shape of the step matches the shape of the opening of the sealing cap with external thread. The outer surface of the metal rod has a flat surface for easy clamping.

5. A method for adjusting an insulating pull rod without disassembly, characterized in that, Includes the following steps: S1: Assemble the overtravel spring, the sealing cap with external threads, the metal rod with steps and external threads, the metal adjusting head assembly and its anti-loosening mechanism as described in claims 1-5 onto the insulating pull rod body to form an insulating pull rod assembly; S2: After connecting the insulating tie rod assembly to the arc-extinguishing chamber of the pole-mounted circuit breaker, adjust the moving part of the metal adjusting head assembly according to the measurement results of the position of the metal adjusting head assembly, precisely adjust the metal adjusting head assembly to the theoretical design position, and tighten the thread anti-loosening mechanism of the metal adjusting head assembly. S3: Connect the insulating tie rod assembly to the pole-mounted circuit breaker drive mechanism, assemble other components, and complete the pole-mounted circuit breaker assembly. S4: Perform mechanical characteristic tests on the pole-mounted circuit breaker. Based on the comparison results of the test data and the mechanical characteristic parameter values ​​of the pole-mounted circuit breaker, without disassembling the insulating tie rod assembly, loosen the threaded anti-loosening mechanism of the metal adjusting head assembly on the insulating tie rod assembly, adjust the moving part of the metal adjusting head assembly to the desired position, and tighten the threaded anti-loosening mechanism of the metal adjusting head assembly. S5: Complete the mechanical characteristic test of the pole-mounted circuit breaker.

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