Rolling contact assembly capable of avoiding poor rolling contact and mechanical transition contact

Abstract

The invention relates to a rolling contact assembly capable of avoiding poor rolling contact and a mechanical transition contact, the rolling contact assembly comprises a rolling contact, a supporting contact and a leaf spring contact, the rolling contact and the supporting contact realize relative rotation through hole-shaft clearance fit, and rolling friction is realized during relative contact movement with a moving contact, so that the rolling contact is prevented from being damaged. In the using process, certain radial force exists between the shaft and the hole so that the shaft can make close contact with the hole to achieve a conductive loop. The spring piece contact is in mechanical connection with the supporting contact in a riveting mode and is connected with a conductive loop, and the spring piece contact is in close contact with the two ends of the idler wheel middle shaft through the elastic force of the spring piece to achieve the conductive loop. The contact radius of the spring piece contact and the roller contact intermediate shaft is very small, the relative sliding linear speed and the equivalent torque are very small, the friction resistance between the movable contact and the static contact can be reduced, the problem that the dispersibility is large due to the fact that sliding friction is affected by the surface quality of parts can be solved, the stability and reliability of the switching action of the tap switch are improved, and the abrasion of the contacts is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of on-load tap-changers, and specifically refers to a rolling contact component and a mechanical transition contact that can avoid poor rolling contact. Background Art

[0002] An on-load tap-changer can realize the switching between tap points in a transformer winding without interrupting the load current, and change the number of turns of the winding to achieve the purpose of voltage regulation. The circuit change in the transition circuit of the on-load tap-changer during the switching process is achieved by using the opening and closing and current-carrying of mechanical contacts. The stability of the switching process is the basic link for the stability of the product. These mechanical contacts that only carry current during switching are called mechanical transition contacts. The existing mechanical transition contacts of on-load tap-changers achieve conduction by means of sliding friction contact. Since the resistance of sliding friction is relatively large, the sliding friction force is greatly affected by the surface quality of parts and the spring pressure, and the change in friction resistance from static friction to dynamic friction is relatively large, resulting in poor stability during the switching process.

[0003] To solve the problem of relatively large sliding friction resistance, usually the way of increasing the driving force is adopted, and a relatively large driving force is used to overcome the friction resistance. However, simply increasing the driving force cannot completely solve the stability problem existing during switching, and simply increasing the driving force sometimes brings negative impacts to the product. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a rolling contact component and a mechanical transition contact that can avoid poor rolling contact, so that the relative movement process of the contact between the moving contact and the static contact forms rolling friction, thereby reducing the switching resistance and the unstable change of the resistance, increasing the stability of the switching process of the on-load tap-changer, and reducing the contact wear.

[0005] The present invention is realized by the following technical solutions. A rolling contact component that can avoid poor rolling contact is provided, including a support contact, and a rolling contact rotatably connected to the support contact through a conductor shaft. The conductor shaft passes through the central hole of the rolling contact, and the conductor shaft is in contact with the rolling contact and the support contact respectively. The rolling contact, the conductor shaft and the support contact are conductively connected in sequence to form a conductive circuit. By arranging a rotatable rolling contact on the support contact in this solution, when the moving contact contacts and moves with the rolling contact during use, the rolling contact rolls relative to the moving contact, changing the sliding friction during the movement of the moving contact in the prior art into rolling friction, reducing the friction force, and forming a conductive circuit among the rolling contact, the conductor shaft and the support contact, which is convenient for realizing the conduction between the moving contact and the static contact.

[0006] As an optimization, a spring - piece contact I is fixedly arranged on the supporting contact. The spring - piece contact I is in contact with the supporting contact. Reed pieces are fixedly arranged at both ends of the spring - piece contact I respectively. The two reed pieces clamp both ends of the conductor shaft respectively. The rolling contact, the conductor shaft, the spring - piece contact I and the supporting contact are conductively connected in sequence to form a conductive circuit. This optimized solution forms a conductive circuit among the rolling contact, the conductor shaft, the spring - piece contact I and the supporting contact by setting the spring - piece contact I. This conductive circuit is not affected by the relative rolling speed of the moving and static contacts in the transformer oil, avoiding the influence on circuit conduction and stability caused by poor contact due to the formation of an oil film in the shaft - hole. At the same time, by using the elastic force of the two reed pieces of the spring contact I, the axial movement of the conductor shaft is restricted, and the reliability of the contact between the conductor shaft and the reed pieces is ensured.

[0007] As an optimization, at least one end face of the conductor shaft is an arc surface. A guide through - hole is arranged on the reed piece corresponding to the end of the conductor shaft with the arc surface. The hole wall of the guide through - hole is in contact with the arc surface, and the diameter of the guide through - hole is not greater than 1 / 5 of the diameter of the conductor shaft. This optimized solution ensures the stable relative position between the reed piece and the conductor shaft, prevents the conductor shaft from separating from the reed piece, and makes the radius of the conduction point close to the rotation center, so that the relative linear speed is small during the rolling process, and thus the wear and heat generation can be ignored.

[0008] As an optimization, a conductor block is fixedly arranged on the supporting contact above the conductor shaft. A through - hole adapted to the upper part of the rolling contact is arranged on the conductor block. The top surface of the conductor block is fixedly connected and in contact with the part between the two reed pieces of the spring - piece contact I to ensure the reliability of contact conduction. With this optimized solution, the upper part of the rolling contact can be located in the through - hole, thus reducing the height above the rolling contact and ensuring stability. Moreover, setting the through - hole can also play a role in weight reduction.

[0009] As an optimization, a contact pressure plate is fixedly arranged on the supporting contact. One end of the contact pressure plate is provided with a support plate extending to the side of the rolling contact away from the supporting contact. A through - hole adapted to one end of the conductor shaft is arranged on the support plate. A support groove adapted to the other end of the conductor shaft is arranged on the supporting contact. The rolling contact, the conductor shaft, the bottom of the support groove and the supporting contact are conductively connected in sequence to form a conductive circuit. The rolling contact, the conductor shaft, the side wall of the support groove and the supporting contact are conductively connected in sequence to form a conductive circuit. The rolling contact, the conductor shaft, the side wall of the through - hole, the contact pressure plate and the supporting contact are conductively connected in sequence to form a conductive circuit. This optimized solution supports the conductor shaft jointly by the support plate of the contact pressure plate and the supporting contact, thus forming three conductive circuits, further avoiding the failure of the conductive circuit caused by poor contact due to the oil film.

[0010] As an optimization, a spring piece contact II is fixedly connected to the contact pressure plate. A side pressure plate extending to the side of the support plate away from the rolling contact is fixedly arranged on the spring piece contact II. One end of the conductor shaft extending out of the through hole abuts against the side pressure plate. The rolling contact, the conductor shaft, the spring piece contact II, the contact pressure plate, and the support contact are sequentially conducted to form an electrical conduction loop. This optimized solution utilizes the elastic force of the side pressure plate of the spring piece II to press the conductor shaft, ensuring the reliability of contact conduction with the conductor shaft. At the same time, an electrical conduction loop is formed among the rolling contact, the conductor shaft, the spring piece contact II, the contact pressure plate, and the support contact, further avoiding the failure of the electrical conduction loop caused by poor contact due to the oil film.

[0011] As an optimization, the spring piece contact II, the contact pressure plate, and the support contact are sequentially arranged and fixedly connected by conductor rivets. The conductor rivets sequentially pass through the spring piece contact II, the contact pressure plate, and the support contact. This optimized solution fixedly connects the spring piece contact II, the contact pressure plate, and the support contact by conductor rivets, with a simple structure. At the same time, the conductor rivets are used for electrical conduction, avoiding the inability to form an electrical conduction loop due to poor contact between the spring piece contact II, the contact pressure plate, and the support contact.

[0012] This solution also provides a mechanical transition contact including the above rolling contact assembly. The mechanical transition contact further includes an annular fixed insulating support and a rotating insulating support located in the inner hole of the fixed insulating support. A plurality of moving contacts distributed circumferentially are fixedly arranged on the rotating insulating support. A plurality of static contact units distributed circumferentially are installed on the fixed insulating support. The static contact unit includes two lead-out contacts distributed circumferentially and a common contact located between the two lead-out contacts. The lead-out contacts and the common contact respectively include two of the rolling contact assemblies. Conductive channels adapted to the moving contacts are formed between the rolling contacts of the two rolling contact assemblies of the lead-out contacts and between the rolling contacts of the two rolling contact assemblies of the common contact. In the mechanical transition contact of this solution, the lead-out contacts and the common contact serve as static contacts, and the rolling contacts in the rolling contact assembly are used to contact and conduct with the moving contacts, forming both rolling friction and ensuring the reliability of the electrical conduction loop.

[0013] As an optimization, the circumferential length of the moving contact is set such that the moving contact simultaneously contacts and conducts with the common contact and one of the lead-out contacts in the same static contact unit. This optimized solution realizes the switching of two circuits through one layer of contacts, greatly reducing the axial distance space compared with the traditional two-layer contact structure with one layer of lead-out contacts and one layer of common contacts, making the structure more compact.

[0014] As an optimization, the moving contact is fixedly connected to the rotating insulating support by bolts, and there are three moving contacts and static contact units evenly distributed along the circumferential direction. The setting of this optimization scheme forms a transition mechanical contact structure of an on-load tap-changer with a three-phase distribution according to a 120-degree uniform distribution of three phases, which has a wider application.

[0015] The beneficial effects of the present invention are as follows: The sliding friction between the moving and static contacts is improved to rolling friction, and by increasing multiple conductive circuits, the influence of the oil film formed during the high-speed rotation of the shaft hole on the conductive circuit is avoided. The contact radius between the spring piece contact and the middle shaft of the rolling contact of this structure is close to the rotation center, and the relative sliding linear velocity and equivalent torque are very small. This structure can greatly reduce the frictional resistance between the moving and static contacts, reduce the initial static resistance during the movement of the moving and static contacts and the influence of the change in the sliding friction dynamic and static resistance, completely avoid the large dispersion of the sliding friction affected by the surface quality of the parts, improve the stability and reliability of the tap-changer switching action, and reduce the wear of the contacts. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the rolling contact component in the first embodiment of the present invention; Figure 2 It is an exploded view of the rolling contact component in the first embodiment of the present invention; Figure 3 It is an exploded view of the rolling contact component in the second embodiment of the present invention; Figure 4 It is a cross-sectional view of the rolling contact component in the second embodiment of the present invention; Figure 5 It is an exploded view of the lead-out contact in the third embodiment of the present invention; Figure 6 It is a cross-sectional view of the lead-out contact in the third embodiment of the present invention; Figure 7 It is a schematic connection diagram of the moving contact and the static contact unit in the mechanical transition contact of the third embodiment of the present invention; Figure 8 It is a schematic three-phase installation diagram formed by the mechanical transition contact of the third embodiment of the present invention; As shown in the figure: 1. Support contact, 2. Rolling contact, 2a. Conductor shaft, 3. Spring piece contact I, 3a. First spring piece, 3b. Second spring piece, 4. Riveting rivet, 5., 6., 7., 8., 9., 10., 13. Contact pressure plate, 14. Spring piece contact II, 14a. Side pressure plate, 15. Conductor rivet, 16. End conduction point, 17. Side wall of support groove, 18. Bottom of support groove, 30. First rolling contact assembly, 30a. Second rolling contact assembly, 31. Upper pressure plate, 31a. Lower pressure plate, 32. Flat washer, 33. Self-locking nut, 34. Long bolt, 35. Spring, 36. Axle pin, 37. Insulating base, 41. Fixed insulating support, 42. Left lead-out contact, 42a. Right lead-out contact, 43. Common contact, 44. Moving contact, 45. Rotating insulating support, 46. Central hole of rotating insulating support. Detailed implementation manners

[0017] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific implementation manners.

[0018] Embodiment 1 As Figure 1 and 2 shown, a rolling contact assembly that can avoid poor rolling contact includes a support contact 1 and a rolling contact 2 rotatably connected to the support contact 1 through a conductor shaft 2a. The conductor shaft 2a passes through the central hole of the rolling contact 2. The outer diameter of the conductor shaft 2a has an interference fit with the hole of the rolling contact 2, and the outer diameter of the conductor shaft 2a has a clearance fit with the support hole of the support contact 1. The rolling contact 2 can rotate in the support hole of the support contact 1 through the conductor shaft 2a, and rolling friction is achieved during the relative contact movement with the moving contact. During use, there is a certain radial force between the shaft and the hole, making the shaft and the hole in close contact to form an electrical conduction path. The conductor shaft 2a is in contact with the rolling contact 2 and the support contact 1 respectively, and the rolling contact 2, the conductor shaft 2a, and the support contact 1 are conductively connected in sequence to form an electrical conduction path. A spring piece contact Ⅰ3 is fixedly arranged on the support contact 1. The spring piece contact Ⅰ3 is in contact with the support contact 1. Both ends of the spring piece contact Ⅰ are fixedly provided with reeds extending to the same side. The two reeds are respectively the first reed 3a and the second reed 3b, both of which are formed by bending the spring piece contact Ⅰ3. The first reed 3a and the second reed 3b respectively clamp both ends of the conductor shaft, forming a two-end spring piece contact structure, and are pressed against both ends of the conductor shaft 2a through the elastic force of the reeds, for limiting the axial movement of the conductor shaft 2a and forming a conducting contact. The rolling contact 2, the conductor shaft 2a, the spring piece contact Ⅰ3 and the support contact 1 are sequentially conducted to form an electric conduction loop, and this electric conduction loop is not affected by the relative rolling speed of the moving and static contacts in the transformer oil. Moreover, both ends of the conductor shaft are respectively in contact with the reeds of the spring piece contact to form an electric conduction loop. Therefore, the roller contact can reach the support contact through the two electric conduction loops, which can effectively avoid the discharge caused by the failure of the electric conduction loop between the rolling contact and the support contact due to the oil film during the relative movement of the moving and static contacts in the transformer oil.

[0019] At least one end face of the conductor shaft is an arc surface protruding outward. A guide through hole is provided on the reed corresponding to the end of the conductor shaft with the arc surface. The hole wall of the guide through hole is in contact with the arc surface. The guide through hole is coaxial with the conductor shaft, and the diameter of the guide through hole is not greater than 1 / 5 of the diameter of the conductor shaft. In this embodiment, arc surfaces are provided at both ends of the conductor shaft, and the arc surfaces are spherical surfaces. Guide through holes are provided on both reeds to ensure the relative position stability between the reed and the conductor shaft and prevent the conductor shaft from separating from the reed. Moreover, the radius of the conducting contact formed by the conductor shaft and the reed is small, so that the relative linear velocity and the equivalent torque during the rolling process are very small, which can greatly reduce the frictional resistance between the moving and static contacts, reduce the resistance during the relative movement of the moving and static contacts and the problem of large dispersion affected by the surface quality of the parts due to sliding friction, improve the stable reliability of the tap changer switching operation, and reduce the wear of the contacts. The wear and heat generation can be ignored.

[0020] To facilitate the connection between the spring piece contact Ⅰ3 and the support contact 1, a conductor block is fixedly arranged on the support contact 1 above the conductor shaft. A through hole adapted to the upper part of the rolling contact is provided on the conductor block. The upper part of the rolling contact is located in the through hole to avoid hindering the rotation of the rolling contact. The top surface of the conductor block is fixedly connected and in contact with the part between the two reeds of the spring piece contact Ⅰ. In this embodiment, the spring piece contact Ⅰ is riveted on the conductor block of the support contact through a riveting rivet 4, with a simple structure and convenient installation.

[0021] In this embodiment, the spring piece contact Ⅰ3 in the contact assembly is made of beryllium bronze. During the use process, two electric conduction loops can be formed: the rolling contact 2 - the conductor shaft 2a - the support contact 1, and the rolling contact 2 - the conductor shaft 2a - the spring piece contact Ⅰ3 - the support contact 1, which can effectively avoid the discharge caused by the failure of the electric conduction loop between the rolling contact 2 and the support contact 1 due to the oil film during the relative movement contact process of the moving and static contacts in the transformer oil.

[0022] Embodiment 2 The difference between this embodiment and Embodiment 1 is that in this embodiment, one end of the conductor shaft is supported by a support contact, and the other end of the conductor shaft is supported by a contact pressure plate, forming a single-end spring piece contact structure.

[0023] Specifically, as Figure 3 and 4 shown, a contact pressure plate 13 is fixedly provided on the support contact. The contact pressure plate 13 is in contact with and conducts electricity with the support contact 1. One end of the contact pressure plate 13 is provided with a support plate extending to the side of the rolling contact away from the support contact. The support plate and the contact pressure plate are an integral part, and the support plate is formed by bending the contact pressure plate. A perforation adapted to the outer end of the conductor shaft is provided on the support plate, and a support groove adapted to the inner end of the conductor shaft is provided on the support contact. The outer diameters of both ends of the conductor shaft are in clearance fit with the support groove and the perforation of the contact pressure plate 13, enabling the rolling contact to rotate within the support groove of the support contact and the perforation of the contact pressure plate. The conductor shaft is in contact with the pore wall of the perforation, the side wall of the support groove, and the bottom of the support groove. The bottom of the support groove restricts the axial movement of the rolling contact and forms a conducting contact point. The radius of this conducting point is very small, resulting in a relatively small linear velocity during the rolling process, so wear and heat generation can be ignored. The rolling contact 2, the conductor shaft 2a, the bottom of the support groove 18, and the support contact 1 are sequentially conducted to form an electrical conduction loop. The rolling contact, the conductor shaft, the side wall of the support groove 17, and the support contact are sequentially conducted to form an electrical conduction loop. The rolling contact, the conductor shaft, the side wall of the perforation, the contact pressure plate, and the support contact are sequentially conducted to form an electrical conduction loop.

[0024] A spring piece contact II 14 is fixedly connected to the contact pressure plate. A side pressure plate 14a extending to the side of the support plate away from the rolling contact is fixedly provided on the spring piece contact II 14. One end of the conductor shaft extending out of the perforation abuts against the side pressure plate, forming an end conducting point 16. The side pressure plate and the spring piece contact II are an integral part, and the side pressure plate is formed by bending the spring piece contact II. The conductor shaft is pressed tightly by the elastic force, enabling the rolling contact 2, the conductor shaft 2a, the spring piece contact II 14, the contact pressure plate 13, and the support contact 1 to be sequentially conducted to form an electrical conduction loop.

[0025] The spring piece contact II, the contact pressure plate, and the support contact are sequentially arranged vertically and fixedly connected by two conductor rivets 15. The conductor rivets 15 sequentially pass through the spring piece contact II 14, the contact pressure plate 13, and the support contact 1 vertically.

[0026] The spring piece contact II 14 of this embodiment is also made of beryllium bronze. During use, four conductive circuits are formed: rolling contact 2 - conductor shaft 2a - bottom of the support groove 18 - support contact 1, rolling contact - conductor shaft - side wall of the support groove 17 - support contact, rolling contact - conductor shaft - side wall of the perforation - contact pressure plate - support contact, rolling contact 2 - conductor shaft 2a - spring piece contact II 14 - contact pressure plate 13 - support contact 1. This can effectively avoid the discharge caused by the failure of the wire circuit between the rolling contact and the support contact due to the oil film during the relative movement and contact of the moving and static contacts in the transformer oil.

[0027] Embodiment III This embodiment provides a mechanical transition contact, which includes the rolling contact assembly described in Embodiment I or Embodiment II.

[0028] The mechanical transition contact of this embodiment further includes an annular fixed insulating support 41 and a rotating insulating support 45 located in the inner hole of the fixed insulating support. A plurality of moving contacts 44 distributed circumferentially are fixed on the rotating insulating support 45. A plurality of static contact units distributed circumferentially are installed on the fixed insulating support 41, and each moving contact corresponds to one static contact unit. The static contact unit includes two lead - out contacts distributed circumferentially and a common contact 43 located between the two lead - out contacts. The two lead - out contacts are respectively a left lead - out contact 42 and a right lead - out contact 42a. The lead - out contacts and the common contact 43 respectively include two of the rolling contact assemblies. The rolling contact assembly is the rolling contact assembly in Embodiment I or Embodiment II, and the support contact 1 of the rolling contact assembly is fixedly arranged relative to the fixed insulating support 41.

[0029] Specifically, as Figure 5 and 6As shown, the support contacts of the two rolling contact assemblies are fixed on the same insulating base 37. In this embodiment, the two rolling contact assemblies fixed on the same insulating base 37 are respectively set as the first rolling contact assembly 30 and the second rolling contact assembly 30a. The first rolling contact assembly 30 and the second rolling contact assembly 30a are respectively located on both sides of the insulating base and are fixedly connected to the insulating base through connecting bolts. A pin 36 is fixedly installed through the insulating base. The pin 36 respectively penetrates the support contacts of the rolling contact assemblies on both sides. The part of the pin 36 extending out of the support contact is sequentially sleeved with a spring 35 and a pressing plate along the axial direction outward. One end of the spring abuts against the pressing plate, and the other end abuts against the support contact, so that the support contact can displace a certain distance along the pin when compressing the spring. A step for respectively supporting the support contacts on both sides is fixedly provided in the middle of the pin 36. The pressing plates on both sides are respectively an upper pressing plate 31 and a lower pressing plate 31a. The upper pressing plate and the lower pressing plate are fixedly connected to the insulating base through a long bolt 34. The long bolt 34 sequentially passes through the lower pressing plate 31a, the insulating base 37 and the upper pressing plate 31, and a self-locking nut 33 is threadedly connected to the end of the long bolt passing through the upper pressing plate.

[0030] A conduction channel adapted to the moving contact is formed between the rolling contacts of the two rolling contact assemblies of the lead-out contact and between the rolling contacts of the two rolling contact assemblies of the common contact.

[0031] The length of the moving contact along the circumferential direction is set such that the moving contact is in contact conduction with the common contact and one of the lead-out contacts in the same static contact unit at the same time. The moving contact is fixedly connected to the rotating insulating support through bolts. The moving contact and the static contact unit are respectively three and are evenly distributed along the circumferential direction.

[0032] Taking the contact assembly of Embodiment 1 as an example, in use, the first rolling contact assembly 30 and the second rolling contact assembly 30a are placed into the two rectangular grooves on both sides of the insulating base 37. The pin 36 passes through the two holes of the first rolling contact assembly 30 and the second rolling contact assembly 30a. The spring 35 is placed into the counterbore of the moving contact assembly through the pin 36, and then is pressed tightly on the insulating base 37 through the long bolt 34, the lower pressing plate 31a, the upper pressing plate 31, the flat washer 32 and the self-locking nut 33. The two end faces of the spring 35 are respectively located in the counterbores of the two moving contact assemblies and in the counterbores of the upper pressing plate 31 and the lower pressing plate 31a. In this way, the first rolling contact assembly 30 and the second rolling contact assembly 30a are pressed tightly on the shaft step of the pin 36 by the spring to form an opening cooperating with the moving contact, and the rolling contact assembly can only move along the direction of spring compression or elongation.

[0033] The rotating insulating support 45 is fixed together with the moving contact 44. The moving contact 44 swings left and right around the axis of its central hole 46 along with the rotating insulating support 45. The left lead-out contact 42 and the right lead-out contact 42a are fixed to the fixed insulating support together with the common contact 43. During the swinging process of the moving contact 44 around the central hole 46 of the rotating insulating support, there are two stop limit positions on the left and right. When in the left limit position, the common contact 43 is conducted with the left lead-out contact 42 to form a conductive circuit: common contact 43 - moving contact 44 - left lead-out contact 42. When in the right limit position, the common contact 43 is conducted with the right lead-out contact 42a to form a conductive circuit: common contact 43 - moving contact 44 - right lead-out contact 42a. The common contact 43 is always in contact with the moving contact 44, and both the left and right lead-out contacts are in the plane where the moving contact 44 is located. The contact positions of the left lead-out contact 42 and the right lead-out contact 42a with the moving contact 44 are outside the contact position of the common contact 43 with the moving contact 44. In this way, the switching of two circuits is realized through one layer of contact mechanism, and the axial space is greatly reduced compared with the traditional two-layer contact structure with one layer of lead-out contacts and one layer of common contacts, making the structure more compact. According to the 120-degree uniform distribution of three phases, a mechanical transition contact structure of on-load tap-changer with three-phase distribution is formed.

[0034] Certainly, the above description is not limited to the above examples. The technical features not described in the present invention can be realized by or adopted from the prior art, and will not be elaborated here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not a limitation to the present invention. The present invention has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention do not depart from the purpose of the present invention and should also fall within the scope of the claims of the present invention.

Claims

1. A rolling contact component capable of avoiding poor rolling contact, characterized in that: It includes a support contact (1) and a rolling contact (2) rotatably connected to the support contact (1) through a conductor shaft (2a). The conductor shaft (2a) passes through the central hole of the rolling contact (2), and the conductor shaft (2a) is in contact with the rolling contact (2) and the support contact (1) respectively. The rolling contact (2), the conductor shaft (2a), and the support contact (1) are conductively connected in sequence to form an electrical conduction loop.

2. The rolling contact component capable of avoiding poor rolling contact according to claim 1, wherein: A spring piece contact I (3) is fixedly provided on the support contact (1). The spring piece contact I (3) is in contact with the support contact (1). Springs are fixedly provided at both ends of the spring piece contact I. The two springs respectively clamp both ends of the conductor shaft. The rolling contact (2), the conductor shaft (2a), the spring piece contact I (3), and the support contact (1) are conductively connected in sequence to form an electrical conduction loop.

3. The rolling contact component capable of avoiding poor rolling contact according to claim 2, wherein: At least one end face of the conductor shaft is an arc surface. A through hole is provided on the spring corresponding to the end of the conductor shaft with the arc surface. The hole wall of the through hole is in contact with the arc surface, and the diameter of the through hole is not greater than 1 / 5 of the diameter of the conductor shaft.

4. A rolling contact component capable of avoiding poor rolling contact according to claim 2, characterized in that: A conductor block is fixedly provided on the support contact above the conductor shaft. A through hole adapted to the upper part of the rolling contact is provided on the conductor block. The top surface of the conductor block is fixedly connected and in contact with the part between the two springs of the spring piece contact I.

5. A rolling contact component capable of avoiding poor rolling contact according to claim 1, characterized in that: A contact pressure plate (13) is fixedly provided on the support contact. One end of the contact pressure plate (13) is provided with a support plate extending to the side of the rolling contact away from the support contact. A through hole adapted to one end of the conductor shaft is provided on the support plate. A support groove adapted to the other end of the conductor shaft is provided on the support contact. The rolling contact (2), the conductor shaft (2a), the bottom of the support groove (18), and the support contact (1) are conductively connected in sequence to form an electrical conduction loop. The rolling contact, the conductor shaft, the side wall of the support groove (17), and the support contact are conductively connected in sequence to form an electrical conduction loop. The rolling contact, the conductor shaft, the side wall of the through hole, the contact pressure plate, and the support contact are conductively connected in sequence to form an electrical conduction loop.

6. A rolling contact component capable of avoiding poor rolling contact according to claim 5, characterized in that: A spring piece contact II (14) is fixedly connected to the contact pressure plate. A side pressure plate (14a) extending to the side of the support plate away from the rolling contact is fixedly provided on the spring piece contact II (14). One end of the conductor shaft extending out of the through hole abuts against the side pressure plate. The rolling contact (2), the conductor shaft (2a), the spring piece contact II (14), the contact pressure plate (13), and the support contact (1) are conductively connected in sequence to form an electrical conduction loop.

7. A rolling contact component capable of avoiding poor rolling contact according to claim 6, characterized in that: The spring piece contact II, the contact pressure plate, and the support contact are arranged in sequence and fixedly connected by a conductor rivet (15). The conductor rivet (15) passes through the spring piece contact II (14), the contact pressure plate (13), and the support contact (1) in sequence.

8. A mechanical transitional contact comprising the rolling contact assembly according to any one of claims 1 to 7, characterized in that: The mechanical transition contact also includes an annular fixed insulating support (41) and a rotating insulating support (45) located in the inner hole of the fixed insulating support. A plurality of moving contacts (44) distributed circumferentially are fixedly provided on the rotating insulating support (45). A plurality of static contact units distributed circumferentially are installed on the fixed insulating support (41). The static contact unit includes two lead-out contacts distributed circumferentially and a common contact (43) located between the two lead-out contacts. The lead-out contact and the common contact (43) respectively include two of the rolling contact assemblies. The support contacts (1) of the rolling contact assemblies are relatively fixedly arranged with respect to the fixed insulating support (41). A conduction channel adapted to the moving contact is formed between the rolling contacts of the two rolling contact assemblies of the lead-out contact and between the rolling contacts of the two rolling contact assemblies of the common contact.

9. The mechanical transition contact according to claim 8, wherein: The circumferential length of the moving contact is set such that the moving contact is simultaneously in contact conduction with the common contact and one of the lead-out contacts in the same static contact unit.

10. The mechanical transition contact according to claim 9, characterized in that: The moving contact is fixedly connected to the rotating insulating support by bolts. The moving contacts and the static contact units are respectively three and are evenly distributed circumferentially.

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