A contact test chuck for a trolley circuit breaker

Abstract

The present invention discloses a trolley circuit breaker contact test chuck, which relates to the field of conductive connection technology, including: a conductive column, which is electrically connected to a test cable; a convex ring, which is fixedly connected to the peripheral side surface of the front end of the conductive column; at least one limit block, which is fixedly connected to the peripheral side surface of the convex ring; a sleeve, which is movably sleeved on the conductive column, and the sleeve has an anti-slip position covering the convex ring in the stroke of axial movement relative to the conductive column; when the convex ring is inserted into the central channel of the circuit breaker contact and passes over the convex parts of each contact piece of the circuit breaker contact, the sleeve moves to the anti-slip position to cover each contact piece of the circuit breaker contact. The present invention can be connected to the circuit breaker contact in the process of one hand or a pushing tool to complete the operation; the convex ring cannot reversely pass over the convex parts of each contact piece and fall off, thereby ensuring a stable electrical connection between the conductive column and each contact piece; the limit block can prevent the conductive column from rotating relative to the circuit breaker contact, reducing negative effects such as the generation of electric sparks and fluctuations in test data.

Description

Technical Field

[0001] The invention relates to the technical field of conductive connection, in particular to a contact test clamp for a trolley circuit breaker. Background Art

[0002] Trolley circuit breakers are widely used in power distribution networks. Electrical testing of trolley circuit breakers is also one of the core tasks of power distribution departments of various units. The structure of the plum blossom contact of the trolley circuit breaker includes an annular contact arm 100, on which a plurality of contact pieces 101 are hingedly or radially slidably connected in a circumferential array. One end of each contact piece has a convex portion 102. At least one annular spring 103 is sleeved on the circumference formed by each contact piece. The annular spring elastically binds each contact piece to keep each contact piece in a synchronously centripetal closed state. When testing the trolley circuit breaker, it is necessary to connect a test chuck with high voltage and high current to the plum blossom contact of the trolley circuit breaker. The connection performance between the test chuck and the plum blossom contact directly affects the test efficiency and the accuracy of the test data.

[0003] For example, the patent with announcement number CN219046328U discloses a special plug-in wire clamp for testing the loop resistance of a plum blossom contact of a trolley-type circuit breaker, which includes a fixed bracket, a rotating bracket, and a spring. Two terminals are arranged on the top of the fixed bracket, a through hole is arranged in the center, and a plurality of slide rails are arranged at the bottom; a driving shaft is arranged on the top of the rotating bracket, and a plurality of spring limit grooves are arranged on the bottom, and the spring limit grooves are arc-shaped; the spring is composed of an arc-shaped conductive sheet, a support rod, and a spring limit column. A support rod is arranged on the inner wall of the arc-shaped conductive sheet, and a spring limit column is vertically arranged on one side of the support rod; the support rod moves in the slide rail, a spring is arranged between the support rod and the fixed bracket, the driving shaft penetrates into the through hole in the center of the fixed bracket, the driving shaft is sleeved in the through hole of the rotating wheel, the spring limit column slides in the spring limit groove, and a torsion spring is arranged between the rotating bracket and the fixed bracket. A spring is arranged between the fixed bracket and the support rod. The elastic force of the spring makes the arc-shaped conductive sheet at the end of the support rod close to the inner wall of the plum blossom contact to avoid distortion of the test data. The rotating bracket is driven to rotate by turning the rotating wheel, so that the arc-shaped conductive sheet moves forward and backward along the radial direction of the rotating bracket, which is convenient for placing the utility model into or taking it out of the plum blossom contact during the test.

[0004] In the prior art such as the above-mentioned patent, although it facilitates the plugging and unplugging operations between the wire clamp and the plum blossom contact to a certain extent, it still has shortcomings: in the process of connecting the wire clamp to the plum blossom contact, it is necessary to insert the wire clamp into the plum blossom contact and then rotate the wheel. This step is difficult to complete with one hand or a conventional single-action output pushing tool; and after the arc-shaped conductive sheet is fitted with the inner wall of the plum blossom contact, it cannot be effectively locked. During the test, the shaking and pulling of the cable connecting the wire clamp can easily cause the arc-shaped conductive sheet to loosen the fit with the inner wall of the plum blossom contact, resulting in inaccurate test data, and even the clamp may fall off the plum blossom contact, causing the risk of electric shock. Summary of the invention

[0005] The object of the present invention is to provide a contact test chuck for a trolley circuit breaker to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a trolley circuit breaker contact test chuck, comprising: a conductive column, which is electrically connected to a test cable; a convex ring, which is fixedly connected to the peripheral side surface of the front end of the conductive column; at least one limit block, which is fixedly connected to the peripheral side surface of the convex ring; a sleeve, which is movably sleeved on the conductive column, and the sleeve has an anti-slip position covering the convex ring in the stroke of axial movement relative to the conductive column; when the convex ring is inserted into the central channel of the circuit breaker contact and passes over the convex parts of each contact piece of the circuit breaker contact, the sleeve moves to the anti-slip position to cover each contact piece of the circuit breaker contact.

[0007] Furthermore, it also includes: a baffle rod, which is movably arranged on the conductive column, and the baffle rod has: a blocking position protruding from the peripheral side of the conductive column to block the sleeve from moving toward the anti-slip position, and an avoidance position retracted into the conductive column in its movable stroke; a trigger mechanism, which is configured to drive the baffle rod to switch from the blocking position to the avoidance position when the convex ring passes over the convex parts of each contact piece; and a linkage mechanism, which is driven by the sleeve to slide along the axial direction of the conductive column toward the convex ring so that the conductive column rotates relative to the sleeve.

[0008] Furthermore, the trigger mechanism includes: a trigger rod, which is slidably arranged on the conductive column along the axial direction of the conductive column, and the trigger rod has: a trigger position protruding from the front end of the conductive column by a first distance, and a retraction position protruding from the front end of the conductive column by a second distance, and the second distance is smaller than the first distance; a first elastic member, the process of restoring its deformation drives the blocking rod to switch from the avoidance position to the blocking position; a first wedge block, which is fixedly connected to the trigger rod; a second wedge block, which is fixedly connected to the blocking rod, and the second wedge block is in sliding contact with the first wedge block.

[0009] Furthermore, the linkage mechanism includes: a ring, which is movably mounted on the conductive column and is fixedly connected to the sleeve; a guide groove, which includes a spiral groove, a straight groove and annular groove that are connected in sequence and are opened on the circumferential side of the conductive column; a sliding column, which is connected to the circular arc groove on the ring through a sliding block that slides along the circumferential direction of the ring, and the sliding column is movably arranged in the guide groove; a second elastic member, which drives the sliding block to abut against one end of the circular arc groove during the process of restoring its deformation.

[0010] Furthermore, the first elastic member includes a compression spring, one end of the compression spring is connected to the conductive column, and the other end of the compression spring is connected to the blocking rod.

[0011] Furthermore, the first elastic member is an elastic telescopic rod.

[0012] Furthermore, the second elastic member includes an arc-shaped compression spring, which is placed in the circular arc slide groove, with one end of the arc-shaped compression spring connected to the slider and the other end of the arc-shaped compression spring connected to the other end of the arc slide groove.

[0013] Furthermore, the sliding column and the sliding block are fixedly connected or rotationally connected.

[0014] Furthermore, a handle is fixedly connected to the collar via at least one connecting rod.

[0015] Furthermore, a conductive head is screwed on one end of the conductive column away from the convex ring, the conductive head is electrically connected to the core of the test cable, and an insulating sleeve covering the test cable is arranged on the conductive head.

[0016] In the above technical scheme, the present invention provides a trolley circuit breaker contact test chuck. When connecting the circuit breaker contact, the convex ring on the conductive column is first inserted into the central channel of the circuit breaker contact along the first direction, the limit block is aligned with the gap between two adjacent contact pieces, the convex ring squeezes the convex part of each contact piece so that each contact piece opens radially, and after the convex ring passes over the convex part of each contact piece of the circuit breaker contact, the annular spring that restrains each contact on the circuit breaker contact makes each contact piece close centripetally, and the convex part of the contact piece is tightly fitted with the conductive column and the convex ring, and then the sleeve is moved along the first direction to the anti-slip position to cover each contact piece of the circuit breaker contact, so that each contact piece can no longer open radially, thereby realizing a stable electrical connection between the present invention and the circuit breaker contact. During the process of connecting the present invention to the circuit breaker contact, the insertion operation of the convex ring and the pushing operation of the sleeve are both along the same first direction, and the operation can be completed with one hand or a pushing tool; after the conductive column and the convex parts of each contact piece are tightly fitted, even if the cable connected to the conductive column produces pulling, shaking and other actions on the conductive column, since the sleeve covers and limits each contact piece so that each contact piece cannot be radially opened, the convex ring cannot reversely pass over the convex parts of each contact piece and fall off, thereby ensuring a stable electrical connection between the conductive column and each contact piece; the setting of the limit block can prevent the conductive column from rotating relative to the circuit breaker contact, thereby reducing the negative effects such as the generation of electric sparks and fluctuations in test data caused by this. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the structure before connecting the contacts provided by the embodiment of the present invention Figure Ⅰ ;

[0019] Figure 2Schematic diagram of the structure before connecting the contacts provided by the embodiment of the present invention Figure II ;

[0020] Figure 3 A cross-sectional view of the structure before connecting contacts provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the structure of the guide groove on the conductive column provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a linkage mechanism provided by an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the structure of the blocking rod blocking the sleeve when connecting contacts provided by an embodiment of the present invention Figure Ⅰ ;

[0024] Figure 7 Schematic diagram of the structure of the blocking rod blocking the sleeve when connecting contacts provided by an embodiment of the present invention Figure II ;

[0025] Figure 8 A structural cross-sectional view of a blocking rod blocking a sleeve when connecting contacts provided by an embodiment of the present invention;

[0026] Fig. 9 Schematic diagram of the structure after connecting contacts provided by an embodiment of the present invention Figure Ⅰ ;

[0027] Fig.10 Schematic diagram of the structure after connecting the contacts provided by the embodiment of the present invention Figure II ;

[0028] Fig.11 A cross-sectional view of the structure after connecting contacts provided by an embodiment of the present invention;

[0029] Fig.12 A schematic diagram of a structure that cooperates with contacts provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Conductive column; 2. Protruding ring; 3. Limit block; 4. Sleeve; 5. Stop rod; 6. Trigger mechanism; 6.1. Trigger rod; 6.2. First elastic member; 6.3. First wedge block; 6.4. Second wedge block; 7. Linkage mechanism; 7.1. Ring; 7.2. Spiral groove; 7.3. Straight groove; 7.4. Ring groove; 7.5. Sliding column; 7.6. Sliding block; 7.7. Circular arc sliding groove; 7.8. Second elastic member; 8. Connecting rod; 9. Handle; 10. Conductive head; 11. Insulating sleeve;

[0032] 100, contact arm; 101, contact piece; 102, convex part; 103, annular spring. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1-12 A trolley circuit breaker contact test chuck provided by an embodiment of the present invention comprises a conductive column 1, a convex ring 2, at least one limit block 3 and a sleeve 4, wherein the conductive column 1 is electrically connected to the test cable, the convex ring 2 is fixedly connected to the peripheral side surface of the front end of the conductive column 1, the limit block 3 is fixedly connected to the peripheral side surface of the convex ring 2, the sleeve 4 is movably sleeved on the conductive column 1, and the sleeve 4 has an anti-slip position covering the convex ring 2 in the axial movement stroke relative to the conductive column 1; when the convex ring 2 is inserted into the central channel of the circuit breaker contact and passes over the convex parts 102 of each contact piece 101 of the circuit breaker contact, the sleeve 4 moves to the anti-slip position to cover each contact piece of the circuit breaker contact that is in a centripetal closed state.

[0035] Specifically, if there is only one limit block 3, the limit block 3 can be directly fixed to any position on the circumferential side surface of the convex ring 2; if there are multiple limit blocks 3, each limit block 3 is distributed in a circular array on the circumferential side surface of the convex ring 2, and the limit block 3 can just be inserted into the gap between two adjacent contact pieces of the circuit breaker contact. The power for the axial movement of the sleeve 4 relative to the conductive column 1 can be applied manually or electrically from the outside, and the sleeve 4 has the ability to be locked in the anti-slip position after moving to the anti-slip position. The structure that can lock two relatively moving parts in the prior art can be used, such as a locking bolt, a positioning pin, etc.

[0036] In the above technical scheme, the present invention provides a trolley circuit breaker contact test chuck. When connecting the circuit breaker contact, the convex ring 2 on the conductive column 1 is first inserted into the central channel of the circuit breaker contact along the first direction, and the limit block 3 is aligned with the gap between two adjacent contact pieces. The convex ring 2 squeezes the convex part of each contact piece so that each contact piece opens radially. After the convex ring 2 passes over the convex part of each contact piece of the circuit breaker contact, the annular spring 103 that restrains each contact on the circuit breaker contact makes each contact piece close centripetally, and the convex part of the contact piece is tightly fitted with the conductive column 1 and the convex ring 2. Then, the sleeve 4 is moved along the first direction to the anti-slip position to cover each contact piece of the circuit breaker contact, so that each contact piece can no longer open radially, thereby realizing a stable electrical connection between the present invention and the circuit breaker contact. During the process of connecting the present invention to the circuit breaker contact, the insertion operation of the convex ring 2 and the pushing operation of the sleeve 4 are both along the same first direction, and the operation can be completed with one hand or a pushing tool; after the conductive column 1 is tightly fitted with the convex parts of each contact piece, even if the cable connected to the conductive column 1 pulls, shakes, etc. on the conductive column 1, the sleeve 4 covers and limits each contact piece so that each contact piece cannot be radially opened, and the convex ring 2 cannot reversely cross the convex parts of each contact piece and fall off, thereby ensuring a stable electrical connection between the conductive column 1 and each contact piece; the setting of the limit block 3 can prevent the conductive column 1 from rotating relative to the circuit breaker contact, thereby reducing the negative effects such as the generation of electric sparks and fluctuations in test data caused by this.

[0037] In another embodiment provided by the present invention, it also includes a blocking rod 5, a trigger mechanism 6 and a linkage mechanism 7. The blocking rod 5 is movably arranged on the conductive column 1. The blocking rod 5 has: a blocking position protruding from the side surface of the conductive column 1 to block the sleeve 4 from moving toward the anti-slip position, and an avoidance position retracted into the conductive column 1; the trigger mechanism 6 is assembled to drive the blocking rod 5 to switch from the blocking position to the avoidance position when the convex ring 2 passes over the convex parts of each contact piece; the linkage mechanism 7 is driven by the sleeve 4 to slide along the axial direction of the conductive column 1 toward the convex ring 2 so that the conductive column 1 rotates relative to the sleeve 4.

[0038] In this embodiment, the connection between the conductive column 1 and the circuit breaker contact is achieved by pushing the sleeve 4. During the insertion of the conductive column 1 into the circuit breaker contact, if the limit block 3 is directly aligned with and inserted into the gap between two adjacent contact pieces, the convex ring 2 can directly abut against each contact piece; if the limit block 3 is not completely aligned with the gap, the limit block 3 will abut against the contact piece. In this case, even if the contact pieces are radially opened outward, the limit block 3 cannot pass over the convex part of the contact piece, that is, the limit block 3 and the convex ring 2 cannot continue to pass. Therefore, the sleeve 4 is continued to be pushed forward at this time, and the sleeve 4 slides axially relative to the conductive column 1, thereby causing the conductive column 1, the convex ring 2 and the limit block 3 to rotate through the linkage mechanism 7, thereby causing the limit block 3 and the contact piece abutted therewith to be staggered and inserted into the gap, thereby achieving the abutment of the convex ring 2 with each contact piece.

[0039] Subsequently, the convex ring 2 must first be passed over the convex parts of each contact piece (the direct sliding contact force between the convex ring 2 and the contact piece enables each contact piece to overcome the elastic force of the annular spring and open radially) so that the convex parts of each contact piece are tightly fitted with the conductive column 1, and then the sleeve 4 is moved to the anti-slip position. Otherwise, if the sleeve 4 reaches the anti-slip position before the convex ring 2 passes over the convex parts of each contact piece, the contact pieces cannot open radially under the covering of the sleeve 4, and the convex ring 2 cannot pass over the convex parts of the contact pieces, resulting in the inability to electrically connect the conductive column 1 and the contact pieces. Therefore, if the convex ring 2 has not yet passed over the convex parts of each contact piece, the blocking rod 5 is in the blocking position to block the sleeve 4 and prevent the sleeve 4 from sliding to the anti-slip position. When the convex ring 2 overcomes the elastic force of the annular spring and passes over the convex parts of each contact piece, the conductive column 1 and the contact pieces have been electrically connected, and the trigger mechanism 6 is triggered, driving the blocking rod 5 to switch from the blocking position to the avoidance position. At this time, the sleeve 4 continues to be pushed forward, and the sleeve 4 can smoothly reach the anti-slip position.

[0040] As a preferred technical solution of this embodiment, the trigger mechanism 6 includes a trigger rod 6.1, a first elastic member 6.2, a first wedge block 6.3 and a second wedge block 6.4. The trigger rod 6.1 is slidably arranged on the conductive column 1 along the axial direction of the conductive column 1. The trigger rod 6.1 has: a trigger position protruding from the front end of the conductive column 1 by a first distance, and a contraction position protruding from the front end of the conductive column 1 by a second distance in the sliding stroke relative to the conductive column 1, and the second distance is smaller than the first distance; the process of the first elastic member 6.2 restoring the deformation drives the blocking rod 5 to move from the avoidance position to the blocking position, and the first elastic member 6.2 is preferably a compression spring, one end of the compression spring is connected to the conductive column 1, and the other end is connected to the blocking rod 5; or the first elastic member 6.2 is an elastic telescopic rod, one end of the elastic telescopic rod is connected to the conductive column 1, and the other end is connected to the blocking rod 5; the first wedge block 6.3 is fixedly connected to the trigger rod 6.1, and the second wedge block 6.4 is fixedly connected to the blocking rod 5, and the second wedge block 6.4 is in sliding contact with the first wedge block 6.3.

[0041] The triggering principle of the trigger mechanism 6 in the present technical solution is as follows: when the convex ring 2 overcomes the elastic force of the annular spring and is about to pass over the convex parts of each contact piece, the trigger rod 6.1 abuts and cooperates with the contact arm 100 of the circuit breaker contact, so that the trigger rod 6.1 moves from the trigger position to the retracted position, and the trigger rod 6.1 slides and abuts with the inclined surface of the first wedge block 6.3 and the inclined surface of the second wedge block 6.4 so that the blocking rod 5 moves from the blocking position to the avoidance position, and the first elastic member 6.2 is also forced to deform and store energy, so that the sleeve 4 can smoothly move to the anti-slip position.

[0042] As a preferred technical solution of this embodiment, the linkage mechanism 7 includes a collar 7.1, a guide groove, a sliding column 7.5 and a second elastic member 7.8, wherein the collar 7.1 is movably sleeved on the conductive column 1, that is, the inner diameter of the collar 7.1 is adapted to the outer diameter of the conductive column 1, and the collar 7.1 can slide and rotate on the conductive column 1, and the collar 7.1 is fixedly connected to the sleeve 4, so the sleeve 4 does not need to be in direct contact with the conductive column 1, and the collar 7.1 can be movably connected to the conductive column 1 through the sleeve 4; the guide groove includes a spiral groove 7.2, a straight groove 7.5 and a second elastic member 7.8, which are opened on the side surface of the conductive column 1 and are connected in sequence. .3 and annular groove 7.4, the straight groove 7.3 is arranged parallel to the axial direction of the conductive column 1, and the annular groove 7.4 is arranged along the circumferential direction of the conductive column 1; the sliding column 7.5 is connected to the circular arc groove 7.7 on the collar 7.1 through the slider 7.6 and slides along the circumferential direction of the collar 7.1, and the sliding column 7.5 is moved and set in the guide groove; the process of the second elastic member 7.8 restoring the deformation drives the slider 7.6 to abut against one end of the circular arc groove 7.7, and the second elastic member 7.8 is preferably an arc compression spring, which is placed in the circular arc groove 7.7, one end of which is connected to the slider 7.6, and the other end is connected to the other end of the arc groove.

[0043] The transmission principle of the linkage mechanism 7 in the present technical solution is as follows: when the limit block 3 is just directly aligned with and inserted into the gap between two adjacent contact pieces, the conductive column 1 cannot rotate relative to the circuit breaker contact and the sleeve 4, and when the sleeve 4 is pushed forward, the slider 7.6 overcomes the elastic force of the second elastic member 7.8 and slides in the arc groove 7.7 until the slide column 7.5 enters the straight groove 7.3 from the spiral groove 7.2; when the limit block 3 is not completely aligned with the gap but abuts against the contact piece, when the sleeve 4 moves relative to the conductive column 1 in the first direction (the direction of movement of the axial direction of the conductive column 1 toward the convex ring 2), the slide column 7.5 first slides with the spiral groove 7.2, and the second elastic member 7.8 presses on the slide column. The force applied by 7.5 is relatively large (greater than the sliding friction between the limit block 3 and the contact piece), so that the conductive column 1, the convex ring 2 and the limit block 3 rotate relative to the sleeve 4 and the contact pieces, so that the limit block 3 and the contact piece it abuts against are completely offset and inserted into the gap. At this time, the slide column 7.5 has not slipped out of the spiral groove 7.2. Therefore, as the sleeve 4 continues to be pushed forward until the sleeve 4 is blocked by the blocking rod 5 located at the blocking position, the limit block 3 has been inserted into the gap, making it impossible for the conductive column 1 to rotate. Therefore, the slider 7.6 will overcome the elastic force of the second elastic member 7.8 and slide in the arc slide groove 7.7 until the slide column 7.5 enters the straight groove 7.3 from the spiral groove 7.2.

[0044] Next, the sleeve 4 is pushed forward continuously, the trigger mechanism 6 is triggered (i.e., the trigger principle of the trigger mechanism 6 mentioned above), so that the blocking rod 5 moves away from the blocking position, the sleeve 4 is pushed forward continuously, the sliding column 7.5 slides in the straight groove 7.3, and when the sleeve 4 is pushed forward to the anti-slip position, the sliding column 7.5 just slides to the intersection of the straight groove 7.3 and the annular groove 7.4, at this time, the sleeve 4 is released, and the elastic force of the second elastic member 7.8 is immediately released to make the slider 7.6 slide along the circular arc slide groove 7.7, and the slider 7.6 drives the sliding column 7.5 to completely slide into the annular groove 7.4, so that the sleeve 4 and the conductive column 1 are locked in the axial direction, and the elastic force of the second elastic member 7.8 can also prevent the sliding column 7.5 from sliding back into the straight groove 7.3, and the sleeve 4 is locked in the anti-slip position, thereby stably connecting the conductive column 1 and the convex ring 2 in the circuit breaker contact.

[0045] When removing from the circuit breaker contact, the sleeve 4 is twisted to overcome the elastic force of the second elastic member 7.8, and the sleeve 4 drives the slider 7.6 and the slide post 7.5 to move together, so that the slide post 7.5 slides to the junction of the annular groove 7.4 and the straight groove 7.3, and then the sleeve 4 is pulled in the opposite direction of the first direction to make the sleeve 4 leave the anti-slip position, and the sleeve 4 is pulled until the sleeve 4 can no longer slide axially relative to the conductive column 1 (the sliding reaches the end of the spiral groove 7.2 and is blocked, or a limiting structure for limiting the relative sliding stroke is provided between the sleeve 4 and the conductive column 1, such as the end of the sleeve 4 or the sleeve ring 7.1 away from the convex ring 2 is blocked by the convex block fixed on the conductive column 1), and then the sleeve 4 is continued to be pulled to drive the conductive column 1 to move together, so that the convex ring 2 and the convex parts of each contact piece are in sliding contact and abutment, so that each contact piece overcomes the elastic force of the annular spring and opens radially, so that the convex ring 2 passes over the convex parts of each contact piece and completely leaves the circuit breaker contact.

[0046] As a preferred technical solution, the slide post 7.5 and the slider 7.6 are fixedly connected, and the slide post 7.5 and the side wall of the spiral groove 7.2 are slidably matched, or the slide post 7.5 and the slider 7.6 are rotationally matched, so that the slide post 7.5 and the side wall of the spiral groove 7.2 are rolling matched, which can significantly reduce friction resistance.

[0047] As a preferred technical solution, a handle 9 is fixedly connected to the collar 7 . 1 via at least one connecting rod 8 , and operations such as pushing the sleeve 4 are achieved via the handle 9 .

[0048] As a preferred technical solution, a conductive head 10 is screwed onto one end of the conductive column 1 away from the convex ring 2 . The conductive head 10 is electrically connected to the core of the test cable. An insulating sleeve 11 covering the test cable is provided on the conductive head 10 .

[0049] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A contact test chuck for a trolley circuit breaker, characterized in that: include: A conductive post electrically connected to the test cable; A convex ring fixedly connected to the peripheral side surface of the front end of the conductive column; At least one limiting block fixedly connected to the peripheral side surface of the convex ring; A sleeve, which is movably sleeved on the conductive column, and has an anti-slip position covering the convex ring during the axial movement of the sleeve relative to the conductive column; A linkage mechanism, which is driven by the sleeve to slide along the axial direction of the conductive column toward the convex ring so that the conductive column rotates relative to the sleeve; A blocking rod is movably arranged on the conductive column, and has: a blocking position protruding from the peripheral side of the conductive column to block the sleeve from moving toward the anti-slip position, and an avoidance position retracted into the conductive column in the travel of the blocking rod relative to the conductive column; A trigger mechanism, which is configured to drive the blocking rod to move from the blocking position to the avoidance position when the convex ring passes over the convex portion of each contact piece; When the convex ring is inserted into the central channel of the circuit breaker contact and passes over the convex parts of each contact piece of the circuit breaker contact, the sleeve moves to the anti-dropping position to cover each contact piece of the circuit breaker contact.

2. A contact test chuck for a trolley circuit breaker according to claim 1, characterized in that: The trigger mechanism comprises: A trigger rod is slidably disposed on the conductive column along the axial direction of the conductive column, and has a trigger position protruding from the front end of the conductive column by a first distance and a retracted position protruding from the front end of the conductive column by a second distance in a sliding stroke of the trigger rod relative to the conductive column, wherein the second distance is smaller than the first distance; The first elastic member, during the process of restoring its deformation, drives the blocking rod to switch from the avoidance position to the blocking position; A first wedge-shaped block, which is fixedly connected to the trigger rod; The second wedge block is fixedly connected to the blocking rod, and the second wedge block is in sliding contact with the first wedge block.

3. A contact test chuck for a trolley circuit breaker according to claim 1 or 2, characterized in that: The linkage mechanism comprises: A sleeve, which is movably mounted on the conductive column, and is fixedly connected to the sleeve; The guide groove includes a spiral groove, a straight groove and an annular groove which are connected in sequence and are opened on the peripheral side of the conductive column; A sliding column is connected to the circular arc sliding groove on the collar by sliding along the circumference of the collar through a slider, and the sliding column is movably arranged in the guide groove; The second elastic member drives the slider to abut against one end of the circular arc sliding groove during the process of restoring its deformation.

4. A contact test chuck for a trolley circuit breaker according to claim 2, characterized in that: The first elastic member includes a compression spring, one end of the compression spring is connected to the conductive column, and the other end of the compression spring is connected to the blocking rod.

5. A contact test chuck for a trolley circuit breaker according to claim 2, characterized in that: The first elastic member is an elastic telescopic rod.

6. A contact test chuck for a trolley circuit breaker according to claim 3, characterized in that: The second elastic member comprises an arc-shaped compression spring, which is placed in the circular arc slide groove, one end of which is connected to the sliding block, and the other end of which is connected to the other end of the arc slide groove.

7. A contact test chuck for a trolley circuit breaker according to claim 3, characterized in that: The sliding column and the sliding block are fixedly connected or rotationally connected.

8. The contact test chuck for a trolley circuit breaker according to claim 3, characterized in that: A handle is fixedly connected to the collar via at least one connecting rod.

9. A contact test chuck for a trolley circuit breaker according to claim 1, characterized in that: A conductive head is screwed on one end of the conductive column away from the convex ring. The conductive head is electrically connected to the core of the test cable, and an insulating sleeve covering the test cable is arranged on the conductive head.

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