A kind of anti-jump test pin for relay protection

Abstract

The utility model provides a kind of anti-jump pin of relay protection test, belong to the technical field of electric power equipment, the anti-jump pin of this relay protection test includes: pin body, elastic reset mechanism, limiting component, buffer gasket, fixed base and guide sleeve;The pin body is cylindrical structure, and the front end of pin body is provided with conical tip, and the taper angle of conical tip is 30 degrees to 45 degrees;The rear end of pin body is fixed on fixed base by screw connection, and fixed base is rectangular block structure, and the bottom of fixed base is provided with at least 4 evenly distributed mounting holes;The elastic reset mechanism includes compression spring and spring seat, and spring seat is fixedly arranged at the middle position of pin body, and one end of compression spring is in contact with spring seat, and the utility model can solve the technical problems that the existing relay protection test pin is prone to accidental jumping and displacement deviation during testing, resulting in inaccurate test results and unstable testing process.

Description

Technical Field

[0001] The utility model belongs to the technical field of power equipment, and specifically relates to an anti-jump contact pin for relay protection testing. Background Art

[0002] Relay protection testing is an extremely important safety detection link in power systems, used to verify whether the operating characteristics and protection functions of relay protection devices are normal. During the relay protection testing process, special test contact pins are required to make electrical connection with the test terminals of the relay protection device, so as to perform measurement of various parameters and function verification. Traditional relay protection test contact pins mainly adopt a simple spring-loaded structure or a fixed connection mode, and these prior arts have obvious deficiencies in practical application. Although existing spring-loaded contact pins can provide a certain contact pressure, they are often affected by factors such as equipment vibration, operation of operators, and electromagnetic interference in the test environment, and are prone to jumping or displacement, resulting in poor contact or complete separation from the test point. Although fixed contact pins have stable position, they lack adaptability, are difficult to adapt to test points with different heights and angles, and are difficult to adjust once there is a deviation in the installation position. At present, most relay protection test equipment on the market adopts manually adjusted contact pin systems, and operators need to repeatedly adjust the position of contact pins to ensure reliable contact, which is not only inefficient but also prone to test errors caused by human factors. Although some test equipment with high degree of automation adopts electronically controlled or pneumatically controlled contact pin drive systems, these systems are complex and expensive, have high maintenance costs, and are easily interfered in complex electromagnetic environments. With the continuous improvement of the automation level of power systems, the requirements for the accuracy and reliability of relay protection testing are becoming more and more stringent, and the limitations of existing contact pin technologies are becoming increasingly prominent, and there is an urgent need for an anti-jump contact pin solution with simple structure, reliable operation and reasonable cost. Summary of Utility Model

[0003] In view of this, the utility model provides an anti-jump contact pin for relay protection testing, which can solve the technical problem that existing relay protection test contact pins are prone to accidental jumping and displacement deviation during testing, resulting in inaccurate test results and unstable test process.

[0004] The utility model is implemented as follows:

[0005] This utility model provides an anti-jump pin for relay protection testing, comprising: a pin body, an elastic reset mechanism, a limiting component, a buffer pad, a fixed base, and a guide sleeve; the pin body is a cylindrical structure, with a tapered tip at its front end, the tapered tip having a cone angle of 30 to 45 degrees; the rear end of the pin body is fixed to the fixed base via a threaded connection, the fixed base being a rectangular block structure, with at least four evenly distributed mounting holes at its bottom; the elastic reset mechanism includes a compression spring and a spring seat, the spring seat being fixedly mounted on the pin body. At the center, one end of the compression spring contacts the spring seat, and the other end of the compression spring abuts against the limiting assembly. The limiting assembly includes a limiting ring and a limiting rod. The limiting ring is sleeved on the needle body and connected to the guide sleeve through the limiting rod. The limiting rod passes vertically through the limiting ring and forms a tight compression fit with the inner wall of the guide sleeve. The buffer pad is disposed between the needle body and the limiting ring. The buffer pad has an annular structure and its inner diameter is slightly larger than the outer diameter of the needle body. The guide sleeve is sleeved on the outside of the needle body and is fixedly connected to the fixed base by at least three connecting bolts distributed at equal angles.

[0006] The technical effects of the anti-jump pin provided by this utility model are as follows: Through the cooperative design of the pin body and the elastic reset mechanism, the reliability of the anti-jump function is achieved. When the pin is subjected to external impact, the elastic reset mechanism can provide a stable restoring force to prevent the pin from jumping or displacing unexpectedly during the test. The precise angle design of the tapered tip ensures good contact with the test point. The limiting component effectively limits the axial movement range of the pin through the structural cooperation of the limiting ring and the limiting rod. The setting of the buffer pad further reduces the impact of mechanical impact on the stability of the pin. The connection method between the guide sleeve and the fixed base ensures the stability and reliability of the overall structure, providing accurate and stable test conditions for relay protection testing.

[0007] Based on the above technical solution, the anti-jump pin for relay protection testing of this utility model can be further improved as follows:

[0008] The pin body is made of stainless steel and its surface is polished. The outer diameter of the pin body is 2 mm to 8 mm and its length is 20 mm to 60 mm. The surface roughness of the tapered tip is less than 0.8 micrometers. The tapered tip is connected to the cylindrical part of the pin body by a smooth transition surface with a radius of curvature of 0.5 mm to 2 mm.

[0009] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by precisely defining the material and size of the pin body, the pin has good conductivity and mechanical strength. The choice of stainless steel material provides excellent corrosion resistance and conductivity stability. The polished surface reduces contact resistance. The precisely controlled outer diameter and length range adapts to the testing requirements of relay protection equipment of different specifications. The surface roughness control of the tapered tip and the transition surface design ensure reliable electrical connection with the test point and reduce poor contact problems caused by uneven surfaces. This provides a material and geometric basis guarantee for the accuracy of relay protection tests.

[0010] Furthermore, the fixing base is made of aluminum alloy, with a length of 40 mm to 80 mm, a width of 30 mm to 60 mm, and a thickness of 10 mm to 25 mm. The mounting hole is a circular through hole with a diameter of 4 mm to 8 mm and a depth that extends through the entire thickness of the fixing base. A central threaded hole is provided in the center of the fixing base for threaded connection with the pin body, and the axis of the central threaded hole is perpendicular to the upper surface of the fixing base.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the selection of aluminum alloy material and precise dimensional design of the fixed base provides good structural stability and weight balance; the reasonable length-width-thickness ratio ensures the stability of the installation; the evenly distributed mounting hole design facilitates fixed installation on different devices; the threaded connection between the central threaded hole and the pin body ensures the axial stability and removable maintenance of the pin; the through-hole design enhances the fixing strength; and the axis of the central threaded hole perpendicular to the surface of the base ensures the verticality accuracy of the pin, providing a reliable basic support platform for the entire anti-jump pin system.

[0012] Furthermore, the compression spring is a cylindrical helical spring with an outer diameter of 12 mm to 20 mm, a free length of 15 mm to 35 mm, and an elastic modulus of 50 N / mm to 150 N / mm; the spring seat is a disc-shaped structure with a diameter 2 mm to 5 mm larger than the outer diameter of the compression spring. The spring seat is fixed to the pin body by welding, and the distance between the welding position and the rear end of the pin body is one-third to one-half of the total length of the pin body.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cylindrical helical structure and precise parameter design of the compression spring provide a stable elastic restoring force; the reasonable range of outer diameter and free length adapts to different installation space requirements; the control range of the elastic coefficient ensures appropriate elastic response characteristics, which can effectively buffer impacts without being overly sensitive; the disc-shaped structure and size design of the spring seat provide a uniform force distribution for the compression spring; the welding connection method ensures the reliability of the connection; and the precise control of the welding position ensures the optimal working effect of the elastic reset mechanism, providing key elastic support for the realization of the anti-jump function.

[0014] Furthermore, the limiting ring is an annular structure, with its inner diameter being 1 mm to 3 mm larger than the outer diameter of the pin body. The outer diameter of the limiting ring is 20 mm to 35 mm, and its thickness is 3 mm to 8 mm. The limiting rod is a cylindrical rod, with one end fixedly connected to the limiting ring and the other end extending into the guide sleeve to form a clearance fit with the inner wall of the guide sleeve, the clearance value being 0.1 mm to 0.5 mm.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the ring structure design and precise inner and outer diameter control of the limiting ring effectively restrict the axial movement of the pin; the appropriate inner diameter clearance ensures the free sliding of the pin while avoiding excessive loosening; the cylindrical structure and clearance fit design of the limiting rod provide a precise guiding function, preventing the pin from radially deviating during operation; the clearance fit between the limiting rod and the inner wall of the guide sleeve ensures smooth sliding and limits unnecessary shaking; the coordinated cooperation of the entire limiting assembly effectively prevents the pin from accidentally shifting during the test, providing reliable position control for maintaining test accuracy.

[0016] Furthermore, the guide sleeve has a cylindrical structure, with an inner diameter 5 mm to 12 mm larger than the outer diameter of the pin body, a wall thickness of 2 mm to 5 mm, and a length of one-half to three-quarters of the length of the pin body. The connecting bolts are evenly distributed on the bottom circumference of the guide sleeve, pass through the bottom of the guide sleeve and mate with the mounting holes of the fixed base, and have a thread specification of M4 to M6. The length of the connecting bolts is 5 mm to 10 mm larger than the thickness of the fixed base.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cylindrical structure of the guide sleeve and the precise inner diameter control provide a stable guiding channel for the pin; the reasonable wall thickness design ensures structural strength while controlling the overall weight; the proportional design of the guide sleeve length ensures sufficient guiding length and compact structural dimensions; the uniform distribution design of the connecting bolts provides balanced fixing force; the precise control of bolt specifications and length ensures the reliability of the connection and the convenience of disassembly and assembly; the design of the bolt length exceeding the fixed base facilitates the tightening operation; and the entire connection system provides a stable support foundation and precise guiding function for the anti-jump pin.

[0018] Furthermore, the surface of the insert body is provided with at least two spiral raised lines, which are distributed equidistantly along the axial direction of the insert body, and the axial distance between adjacent spiral raised lines is 3 mm to 8 mm.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the spiral raised texture design on the surface of the pin body increases the frictional damping between the pin and the inner wall of the guide sleeve, effectively reducing the small vibrations and wobbling of the pin in the axial direction. The spiral texture structure can provide a self-locking effect when the pin rotates. The equidistant distribution design ensures the uniformity of the damping effect. The appropriate axial spacing control ensures that there is sufficient damping effect without excessively increasing the frictional resistance. The spiral geometry allows the texture to play a role in both the axial and radial directions, further improving the stability of the pin position and providing surface structure optimization for the enhancement of the anti-jump function.

[0020] Furthermore, the upper surface of the fixed base is provided with a cross-shaped groove, the two grooves of the cross-shaped groove are perpendicular to each other and intersect at the geometric center of the fixed base, the width of the cross-shaped groove is 2 mm to 5 mm, and the depth of the cross-shaped groove is 1 mm to 3 mm.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the cross-shaped groove design on the upper surface of the fixed base provides an auxiliary function for installation positioning. The cross structure formed by two mutually perpendicular grooves provides an intuitive reference standard for directional alignment during installation. The design of the grooves intersecting at the geometric center ensures the accuracy of positioning. The reasonable groove width and depth can play a positioning role without weakening the structural strength of the base. The symmetrical cross-shaped design facilitates installation needs in different directions. The presence of the groove can also accommodate a small amount of lubricant or rust inhibitor during the installation process, providing practical functional enhancement for the fixed base.

[0022] Furthermore, the inner wall of the guide sleeve is provided with a longitudinal guide groove, which is arranged along the axial direction of the guide sleeve. The number of longitudinal guide grooves is 3 to 6 and they are evenly distributed on the circumference of the inner wall of the guide sleeve. The width of the longitudinal guide groove is 1 mm to 3 mm and the depth of the longitudinal guide groove is 0.5 mm to 2 mm.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the longitudinal guide groove design on the inner wall of the guide sleeve further enhances the guiding control of the pin and the limiting rod. The axial setting of the longitudinal groove is consistent with the movement direction of the pin, reducing the possibility of radial offset. The evenly distributed multiple guide grooves provide all-round guiding constraints. The reasonable groove width and groove depth design can play a guiding role without excessively increasing the processing difficulty. The existence of the guide groove can also collect and guide a small amount of lubricating grease, ensuring smooth operation in long-term use. The combined use of the longitudinal guide groove and the spiral raised texture forms a more complete anti-jump control system.

[0024] Furthermore, the number of spiral raised patterns is 3 to 6, and the spiral raised patterns are distributed at equal angles on the surface of the pin body. The height of the spiral raised patterns is 0.2 mm to 0.8 mm, and the width of the spiral raised patterns is 0.5 mm to 1.5 mm.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the precise control of the number and geometric parameters of the spiral raised texture achieves the optimal anti-jump effect; the number range of 3 to 6 textures provides sufficient contact area while avoiding excessive complexity; the equiangular distribution ensures the uniformity and symmetry of frictional damping; the precisely controlled texture height can generate effective damping without causing excessive frictional resistance; the reasonable texture width design ensures the feasibility of processing and wear resistance in use; and the optimized combination of texture parameters enables the anti-jump pin to have stable anti-jump characteristics while maintaining sensitivity, providing technical support for the surface microstructure for the accuracy and reliability of relay protection tests.

[0026] Compared with existing technologies, the advantages of this utility model for providing an anti-jump pin in relay protection testing are as follows: This utility model effectively solves the technical problem of pin jump in relay protection testing through a unique anti-jump structure design. The conical tip and spiral texture design of the pin body achieve stable contact with the test point. The elastic reset mechanism provides reliable restoring force through the cooperation of the compression spring and spring seat, allowing the pin to quickly return to the preset position when subjected to external impact or vibration. The limiting ring and limiting rod structure of the limiting component form a precise position control system, effectively limiting the axial and radial movement range of the pin. The buffer pad further absorbs mechanical impact energy and reduces vibration transmission. The guide groove on the inner wall of the guide sleeve and the spiral texture on the pin surface form a dual anti-jump mechanism, significantly improving position stability while maintaining pin sensitivity. The cross-shaped groove design of the fixed base facilitates precise installation and positioning, and the material selection and dimensional optimization of the overall structure ensure long-term reliability. Compared with existing technologies, this invention not only improves testing accuracy and stability, but also reduces the test error rate caused by pin jump, providing important technical support for the automation and standardization of relay protection testing, and has significant practical value and application prospects. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front view of an anti-jump pin in a relay protection test.

[0029] Figure 2 This is a schematic diagram of the internal structure of an anti-jump pin for relay protection testing;

[0030] Figure 3 A top view of an anti-jump pin in a relay protection test;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Pin body; 20. Elastic reset mechanism; 21. Compression spring; 22. Spring seat; 30. Limiting assembly; 31. Limiting ring; 32. Limiting rod; 40. Buffer pad; 50. Fixed base; 60. Guide sleeve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The image shows an embodiment of an anti-jump pin for relay protection testing provided by this utility model. In this embodiment, it includes: a pin body 10, an elastic reset mechanism 20, a limiting component 30, a buffer pad 40, a fixed base 50, and a guide sleeve 60. The pin body has a cylindrical structure, with a tapered tip at its front end, the tapered tip having a cone angle of 30 to 45 degrees. The rear end of the pin body is fixed to the fixed base via a threaded connection. The fixed base has a rectangular block structure, and at least four evenly distributed mounting holes are provided at its bottom. The elastic reset mechanism includes a compression spring 21 and a spring seat 22. A spring seat is fixedly positioned in the middle of the needle body. One end of the compression spring contacts the spring seat, and the other end of the compression spring abuts against the limiting assembly. The limiting assembly includes a limiting ring 31 and a limiting rod 32. The limiting ring is sleeved on the needle body and connected to the guide sleeve through the limiting rod. The limiting rod passes vertically through the limiting ring and forms a tight compression fit with the inner wall of the guide sleeve. A buffer pad is disposed between the needle body and the limiting ring. The buffer pad has an annular structure and its inner diameter is slightly larger than the outer diameter of the needle body. The guide sleeve is sleeved on the outside of the needle body and is fixedly connected to the fixed base by at least three connecting bolts distributed at equal angles.

[0035] In the above technical solution, the pin body is made of stainless steel, the surface of the pin body is polished, the outer diameter of the pin body is 2 mm to 8 mm, and the length of the pin body is 20 mm to 60 mm; the surface roughness of the tapered tip is less than 0.8 micrometers, and the tapered tip is connected to the cylindrical part of the pin body through a smooth transition surface with a radius of curvature of 0.5 mm to 2 mm.

[0036] Furthermore, in the above technical solution, the fixing base is made of aluminum alloy material, the length of the fixing base is 40 mm to 80 mm, the width of the fixing base is 30 mm to 60 mm, and the thickness of the fixing base is 10 mm to 25 mm; the mounting hole is a circular through hole with a diameter of 4 mm to 8 mm and a depth that extends through the entire thickness of the fixing base; a central threaded hole is provided in the center of the fixing base for threaded connection with the pin body, and the axis of the central threaded hole is perpendicular to the upper surface of the fixing base.

[0037] Furthermore, in the above technical solution, the compression spring is a cylindrical helical spring with an outer diameter of 12 mm to 20 mm, a free length of 15 mm to 35 mm, and an elastic coefficient of 50 N / mm to 150 N / mm; the spring seat is a disc-shaped structure with a diameter 2 mm to 5 mm larger than the outer diameter of the compression spring, and the spring seat is fixed to the pin body by welding, with the welding position being one-third to one-half of the total length of the pin body.

[0038] Furthermore, in the above technical solution, the limiting ring is an annular structure, the inner diameter of the limiting ring is 1 mm to 3 mm larger than the outer diameter of the pin body, the outer diameter of the limiting ring is 20 mm to 35 mm, and the thickness of the limiting ring is 3 mm to 8 mm; the limiting rod is a cylindrical rod, one end of the limiting rod is fixedly connected to the limiting ring, and the other end of the limiting rod extends into the guide sleeve and forms a clearance fit with the inner wall of the guide sleeve, with a clearance value of 0.1 mm to 0.5 mm.

[0039] Furthermore, in the above technical solution, the guide sleeve has a cylindrical structure, the inner diameter of the guide sleeve is 5 mm to 12 mm larger than the outer diameter of the pin body, the wall thickness of the guide sleeve is 2 mm to 5 mm, and the length of the guide sleeve is one-half to three-quarters of the length of the pin body; the connecting bolts are evenly distributed on the bottom circumference of the guide sleeve, the connecting bolts pass through the bottom of the guide sleeve and mate with the mounting holes of the fixed base, the thread specification of the connecting bolts is M4 to M6, and the length of the connecting bolts is 5 mm to 10 mm larger than the thickness of the fixed base.

[0040] Furthermore, in the above technical solution, the surface of the insert body is provided with at least two spiral raised patterns. The spiral raised patterns are distributed in an equidistant spiral along the axial direction of the insert body, and the axial distance between adjacent spiral raised patterns is 3 mm to 8 mm.

[0041] Furthermore, in the above technical solution, the upper surface of the fixed base is provided with a cross-shaped groove, the two grooves of the cross-shaped groove are perpendicular to each other and intersect at the geometric center of the fixed base, the width of the cross-shaped groove is 2 mm to 5 mm, and the depth of the cross-shaped groove is 1 mm to 3 mm.

[0042] Furthermore, in the above technical solution, the inner wall of the guide sleeve is provided with a longitudinal guide groove, which is arranged along the axial direction of the guide sleeve. The number of longitudinal guide grooves is 3 to 6 and they are evenly distributed on the circumference of the inner wall of the guide sleeve. The width of the longitudinal guide groove is 1 mm to 3 mm and the depth of the longitudinal guide groove is 0.5 mm to 2 mm.

[0043] Furthermore, in the above technical solution, the number of spiral raised patterns is 3 to 6, and the multiple spiral raised patterns are distributed at equal angles on the surface of the pin body. The height of the spiral raised patterns is 0.2 mm to 0.8 mm, and the width of the spiral raised patterns is 0.5 mm to 1.5 mm.

[0044] Before use, first check that all components of the anti-jump pin are intact, ensuring the spiral grooves are free from wear, the springs are free from fatigue deformation, and the inner wall of the guide sleeve is free from scratches. When installing the anti-jump pin onto the relay protection test equipment, secure it with bolts through the mounting holes of the base, using the cross-shaped groove for precise positioning to ensure the pin axis is accurately aligned with the test point. After installation, manually press the pin body lightly to check the working status of the elastic reset mechanism. The pin should be able to move smoothly axially and automatically return to its initial position. In actual testing, slowly approach the pin towards the test terminal of the relay protection device. When the conical tip contacts the test point, continue to apply appropriate pressure to compress the pin by about 2 to 5 mm. At this point, the elastic reset mechanism provides stable contact force, and the spiral grooves begin to play their anti-jump role. Throughout the test, avoid applying excessive lateral force to the pin; normal equipment vibration and slight operational disturbances will not affect the stability of the pin. After the test, gently pull the pin back to separate it from the test point. The pin will automatically return to its initial position under the action of the elastic reset mechanism. During long-term use, the insert should be cleaned and lubricated regularly to remove dust and oxides from the spiral grooves. A small amount of grease should be applied to the inner wall of the guide sleeve to ensure smooth movement. If significant wear or a decline in the elastic return function is observed in the insert, the corresponding component should be replaced promptly. When storing, the insert should be kept in its naturally extended position to avoid prolonged compression of the spring, which can lead to elastic fatigue. With proper operation and maintenance, the anti-jump insert can provide long-term, stable, and reliable service in various relay protection testing environments.

[0045] The following is a specific embodiment 1 of this utility model: The relay protection test anti-pumping pin in this embodiment is mainly used for the testing of relay protection devices in 110 kV substations. The pin body is made of 316 stainless steel, with an outer diameter of 4 mm and a total length of 35 mm. The surface is mirror-polished to a roughness of 0.4 micrometers. The cone angle of the tapered tip is designed to be 37.5 degrees, and the radius of curvature of the transition surface is 1 mm, ensuring optimal contact with the standard test terminal. The surface of the pin body is machined with four spiral raised lines, each 0.5 mm high and 1 mm wide, with a spiral spacing of 5 mm, evenly distributed at 90-degree intervals. The fixing base is made of 6061 aluminum alloy, with dimensions of 60 mm × 45 mm × 18 mm. The four mounting holes are 6 mm in diameter and fixed with M5 bolts. The cross-shaped groove on the upper surface of the base is 3 mm wide and 2 mm deep, providing a precise reference for installation positioning. The elastic reset mechanism uses a cylindrical helical spring with an outer diameter of 16 mm, a free length of 25 mm, and an elastic modulus of 100 N / mm. The spring seat has a diameter of 20 mm and is fixed to the pin body 12 mm from the rear end via argon arc welding. The limiting ring is made of brass, with an inner diameter 2 mm larger than the outer diameter of the pin body (28 mm outer diameter) and a thickness of 5 mm. The limiting rod is made of 3 mm diameter round steel, with one end fixedly connected to the limiting ring and the other end extending into the guide sleeve, maintaining a 0.3 mm clearance fit with the inner wall. The guide sleeve is made of aluminum alloy, with an inner diameter of 16 mm, a wall thickness of 3 mm, and a length of 20 mm. Five longitudinal guide grooves are machined on the inner wall, each 2 mm wide and 1 mm deep. The buffer pad is made of polyurethane elastic material, with an annular structure having an inner diameter of 4.5 mm, an outer diameter of 15 mm, and a thickness of 2 mm. In practical operation, when the pin contacts the test point, the tapered tip first contacts the test terminal surface. As pressure increases, the pin begins to compress, with the spring providing approximately 3 Newtons of contact force. The helical pattern and guide groove work together to create a moderate damping effect, effectively preventing vibration caused by equipment shock. The limiting mechanism restricts the maximum compression stroke of the pin to within 8 mm, preventing excessive compression from damaging the spring. The entire system operates stably within a temperature range of -20°C to +60°C and can withstand an impact of 5 times the force of gravity without vibration. After 5000 consecutive compression tests, all components maintained good working condition, and the test contact resistance remained stable below 0.002 ohms, meeting the high precision requirements of relay protection testing. This embodiment is particularly suitable for outdoor substation environments, with its compact structure and easy maintenance, significantly improving the efficiency and reliability of relay protection testing.

[0046] The following is another specific embodiment 2 of this utility model: Embodiment 2 is an improved design based on Embodiment 1, specifically for applications in special environments. Based on the original structure, the main body of the pin is made of titanium alloy to withstand more severe corrosive environments, such as substations in island or coastal areas. The number of spiral raised lines on the pin surface is increased to 6, the line height is increased to 0.7 mm, and the spiral spacing is shortened to 4 mm to enhance the anti-jump effect. The compression spring of the elastic reset mechanism adopts a double-layer design; the outer spring is responsible for the main elastic restoring force, while the inner spring acts as a buffer and auxiliary. The elastic coefficients of the two springs are 80 N / mm and 40 N / mm respectively. This design gives the pin better buffering characteristics and faster recovery speed when subjected to impact. The limiting component has been strengthened and improved; the limiting ring is made of high-strength aluminum alloy and undergoes hard anodizing treatment, improving wear resistance and service life. The number of guide grooves on the inner wall of the guide sleeve is increased to 8, and solid lubricant is filled in the grooves to further reduce frictional resistance and wear. The cushioning pads have been replaced with silicone rubber, which offers better temperature resistance and chemical stability. The mounting base has been fitted with a sealing ring groove, allowing for the installation of a rubber sealing ring to improve dust and water resistance.

[0047] Specifically, the principle of this utility model is as follows: This utility model adopts a mechanical anti-jump principle, achieving stable positioning of the pin through a multi-layered structural design. First, the tapered tip design of the pin body can form a wedge-shaped fit with the test point. Although the contact area is small, the contact pressure distribution is reasonable, making it difficult to detach even under slight external force. The spiral raised texture on the pin surface forms a micro-interlocking structure with the inner wall of the guide sleeve. When the pin is subjected to axial impact, the spiral texture will generate tangential resistance with the guide groove, decomposing the axial force into a tangential component, greatly reducing the actual displacement. The core of the elastic reset mechanism lies in the pre-compression design of the compression spring. By accurately calculating the spring's elastic coefficient and pre-compression amount, the spring is in a stable force balance state under normal working conditions, and can quickly return to the initial position after the external force is removed. The limiting component forms a double limiting mechanism through the ring constraint of the limiting ring and the guiding action of the limiting rod. The limiting ring controls the maximum stroke of the pin, while the limiting rod ensures the linearity of the pin's movement and prevents radial deviation. The buffer pads are made of elastic material, capable of absorbing and gradually releasing instantaneous impact energy, thus providing damping and cushioning. The guide groove design on the inner wall of the guide sleeve is based on fluid mechanics principles, creating stable airflow damping during the pin's movement, further enhancing the system's stability. The entire anti-jump mechanism is the result of the synergistic effect of multiple physical principles, including elasticity, tribology, and damping theory. Through the appropriate combination of structural parameters, high-precision position control and excellent anti-jump performance are achieved.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A relay protection test anti-jump pin, characterized in that, include: The device comprises a pin body, an elastic reset mechanism, a limiting component, a buffer pad, a fixed base, and a guide sleeve. The pin body is cylindrical with a tapered tip at its front end, the tapered tip having a cone angle of 30 to 45 degrees. The rear end of the pin body is threadedly fixed to the fixed base, which is a rectangular block structure with at least four evenly distributed mounting holes at its bottom. The elastic reset mechanism includes a compression spring and a spring seat. The spring seat is fixedly positioned in the middle of the pin body, and one end of the compression spring is connected to... The spring seat contacts the other end of the compression spring, which abuts against the limiting assembly. The limiting assembly includes a limiting ring and a limiting rod. The limiting ring is sleeved on the needle body and connected to the guide sleeve through the limiting rod. The limiting rod passes vertically through the limiting ring and forms a tight compression fit with the inner wall of the guide sleeve. The buffer pad is disposed between the needle body and the limiting ring. The buffer pad has an annular structure and its inner diameter is slightly larger than the outer diameter of the needle body. The guide sleeve is sleeved on the outside of the needle body and is fixedly connected to the fixed base by at least three connecting bolts distributed at equal angles.

2. The anti-jump pin for relay protection testing according to claim 1, characterized in that, The pin body is made of stainless steel and its surface is polished. The outer diameter of the pin body is 2 mm to 8 mm and its length is 20 mm to 60 mm. The surface roughness of the tapered tip is less than 0.8 micrometers. The tapered tip is connected to the cylindrical part of the pin body by a smooth transition surface with a radius of curvature of 0.5 mm to 2 mm.

3. The anti-jump pin for relay protection testing according to claim 2, characterized in that, The mounting base is made of aluminum alloy, with a length of 40 mm to 80 mm, a width of 30 mm to 60 mm, and a thickness of 10 mm to 25 mm. The mounting hole is a circular through hole with a diameter of 4 mm to 8 mm and a depth that extends through the entire thickness of the mounting base. A central threaded hole is provided in the center of the mounting base for threaded connection with the pin body, and the axis of the central threaded hole is perpendicular to the upper surface of the mounting base.

4. The anti-jump pin for relay protection testing according to claim 3, characterized in that, The compression spring is a cylindrical helical spring with an outer diameter of 12 mm to 20 mm, a free length of 15 mm to 35 mm, and an elastic modulus of 50 N / mm to 150 N / mm. The spring seat is a disc-shaped structure with a diameter 2 mm to 5 mm larger than the outer diameter of the compression spring. The spring seat is fixed to the pin body by welding, and the distance between the welding position and the rear end of the pin body is one-third to one-half of the total length of the pin body.

5. The anti-jump pin for relay protection testing according to claim 4, characterized in that, The limiting ring is an annular structure. The inner diameter of the limiting ring is 1 mm to 3 mm larger than the outer diameter of the pin body. The outer diameter of the limiting ring is 20 mm to 35 mm, and the thickness of the limiting ring is 3 mm to 8 mm. The limiting rod is a cylindrical rod. One end of the limiting rod is fixedly connected to the limiting ring, and the other end of the limiting rod extends into the guide sleeve and forms a clearance fit with the inner wall of the guide sleeve. The clearance value is 0.1 mm to 0.5 mm.

6. The anti-jump pin for relay protection testing according to claim 5, characterized in that, The guide sleeve has a cylindrical structure. The inner diameter of the guide sleeve is 5 mm to 12 mm larger than the outer diameter of the pin body. The wall thickness of the guide sleeve is 2 mm to 5 mm. The length of the guide sleeve is one-half to three-quarters of the length of the pin body. The connecting bolts are evenly distributed on the bottom circumference of the guide sleeve. The connecting bolts pass through the bottom of the guide sleeve and mate with the mounting holes of the fixed base. The thread specification of the connecting bolts is M4 to M6. The length of the connecting bolts is 5 mm to 10 mm larger than the thickness of the fixed base.

7. The anti-jump pin for relay protection testing according to claim 6, characterized in that, The surface of the insert body is provided with at least two spiral raised lines. The spiral raised lines are distributed in an equidistant spiral along the axial direction of the insert body, and the axial distance between adjacent spiral raised lines is 3 mm to 8 mm.

8. The anti-jump pin for relay protection testing according to claim 7, characterized in that, The upper surface of the fixed base is provided with a cross-shaped groove. The two grooves of the cross-shaped groove are perpendicular to each other and intersect at the geometric center of the fixed base. The width of the cross-shaped groove is 2 mm to 5 mm, and the depth of the cross-shaped groove is 1 mm to 3 mm.

9. The anti-jump pin for relay protection testing according to claim 8, characterized in that, The inner wall of the guide sleeve is provided with a longitudinal guide groove, which is arranged along the axial direction of the guide sleeve. The number of longitudinal guide grooves is 3 to 6 and they are evenly distributed on the circumference of the inner wall of the guide sleeve. The width of the longitudinal guide groove is 1 mm to 3 mm and the depth of the longitudinal guide groove is 0.5 mm to 2 mm.

10. The anti-jump pin for relay protection testing according to claim 9, characterized in that, The number of spiral raised patterns is 3 to 6, and the spiral raised patterns are distributed at equal angles on the surface of the pin body. The height of the spiral raised patterns is 0.2 mm to 0.8 mm, and the width of the spiral raised patterns is 0.5 mm to 1.5 mm.

Images