Variable-diameter auxiliary device for measuring loop resistance of handcart switch of switch cabinet

Abstract

The invention relates to the technical field of resistance measurement, and discloses a variable-diameter switch cabinet handcart switch loop resistance measurement auxiliary device which comprises a holding cylinder, a lifting cylinder is slidably mounted in the holding cylinder, the inner wall of the lifting cylinder is in threaded connection with a hand rotating rod assembly, and the hand rotating rod assembly is rotatably mounted at the bottom of the holding cylinder through a rotating end cover. The top of the lifting cylinder is rotationally connected with an attaching piece, the attaching piece is connected with the top of the holding cylinder through a supporting connecting rod, and the two ends of the supporting connecting rod are rotationally connected. And the plurality of contact pieces are arranged at the top end of the attaching piece, and the connecting wire is electrically connected with the wire clamp connecting piece. The position of the contact piece can be adjusted, the adjusting process is synchronous, so that tulip contacts of different sizes and specifications can be adapted, the contact piece is in reliable contact with the tulip contacts after being unfolded, the tulip contacts are not prone to falling off and popping up, the number of contact points is large, and the measuring accuracy is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of resistance measurement, and more particularly to a switch cabinet trolley switch loop resistance measurement auxiliary device with a variable diameter. Background Art

[0002] During electrical equipment testing, measuring switch loop resistance is crucial for ensuring good contact between the equipment's current-carrying components and the safe and stable operation of the power system. Accurately measuring switch loop resistance can promptly identify potential equipment failures and prevent malfunctions such as overheating caused by poor contact.

[0003] At present, there are certain obstacles in measuring the loop resistance of switch in switch cabinet trolleys. The diameter, contact finger thickness and density of the plum blossom contacts of switch cabinet trolleys of different models and equipment manufacturers are not uniform. In order to ensure reliable current flow, the test wire clamps of the loop resistance tester are often large in size, resulting in the test wiring clamps being unable to reliably connect with the plum blossom contacts during measurement, and easily falling off and popping out, or having poor contact. This not only affects the accuracy of the measurement, but may also lead to test interruption, requiring repeated operations, reducing work efficiency, and even causing damage to test equipment and electric shock to people. Therefore, there is an urgent need to provide a switch loop resistance measurement auxiliary device for switch cabinet trolleys with a variable diameter to solve the above problems. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a switch cabinet trolley switch loop resistance measurement auxiliary device with a variable diameter. As an intermediate connection device between the wiring clamp and the plum blossom contact, it can also be applied to plum blossom contacts of different diameters, and ensure reliable contact, ensuring that the loop resistance measurement test is carried out smoothly.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device, comprising: A grip tube, in which a lifting cylinder is slidably installed, a hand-rotating rod assembly is threadedly connected to the inner wall of the lifting cylinder, and the hand-rotating rod assembly is rotatably installed on the bottom of the grip tube by rotating the end cover, and the top of the lifting cylinder is rotatably connected to a resting piece, and the resting piece and the top of the grip tube are connected by a supporting connecting rod, and both ends of the supporting connecting rod are rotatably connected; A plurality of contact members are provided at the top of the abutting member, the outer arc surface of the contact member is connected with a connecting wire, and the connecting wire is electrically connected to the wire clamp connecting piece.

[0006] As a further improvement to the present invention, the hand-rotating rod assembly includes a grip rod and a rotating rod, and the rotating rod passes through the rotating end cover and extends to the interior of the lifting cylinder.

[0007] As a further improvement to the present invention, the rotary rod is rotatably connected to the rotary end cover, an external thread portion is provided on the rotary rod, and an internal thread portion is provided on the inner wall of the lifting cylinder.

[0008] As a further improvement to the present invention, a limiting protrusion is vertically provided on the outer wall of the lifting cylinder, and a limiting sliding groove is provided on the inner wall of the grip cylinder.

[0009] As a further improvement to the present invention, four contact members are provided, the four contact members are distributed in a circumference, and the bottom surface of the contact member is crescent-shaped.

[0010] As a further improvement to the present invention, the connecting wire includes a bending and contraction section and a sliding fastener, and the bending and contraction section is located in the inner cavity of the lifting cylinder.

[0011] As a further improvement to the present invention, a conductive sliding disk is provided at the top end of the rotary rod, the sliding fastener is slidably connected to the conductive sliding disk, and the conductive sliding disk is electrically connected to the wire clamp connecting piece.

[0012] As a further improvement to the present invention, two wire clamp connecting pieces are provided, and the wire clamp connecting pieces are located at two end surfaces of the grip rod. Protective covers for protecting the wire clamp connecting pieces are also provided at both ends of the grip rod.

[0013] As a further improvement to the present invention, the contact member, the connecting wire, the wire clamp connecting piece and the conductive sliding disk are all made of copper.

[0014] As a further improvement to the present invention, the inner surface of the contact member and the outer surface of the wire clamp connecting piece are silver-plated.

[0015] The beneficial technical effects of the present invention are: The contact piece in the present invention can be adjusted in position, and the adjustment process is synchronized, so as to adapt to plum blossom contacts of different sizes. After the contact piece in the present invention is unfolded, it can reliably contact with the plum blossom contact and is not easy to fall off and pop out. The present invention has more contact points, ensuring the accuracy of measurement.

[0016] The variable diameter structure of the present invention adopts an umbrella-shaped expansion design, which is simple to operate, and the expansion and diameter change are stable and convenient. After rotating the hand-rotating rod, the rotation drives the lifting and lowering. During the lifting process, the connecting rod structure drives the abutment part to expand or contract until the contact part and the spring structure of the plum blossom contact are offset. The present invention combines the unique spring structure of the plum blossom contact and the contact finger gap to allow the contact part to smoothly fit with the spring. The present invention has many contact points and high contact reliability. It is locked when the rotation stops and is not prone to retraction. The operation process is simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a three-dimensional schematic diagram of the present invention in a folded state.

[0018] Figure 2 It is a three-dimensional schematic diagram of the present invention in the unfolded state.

[0019] Figure 3 It is a partial cross-sectional schematic diagram of the present invention.

[0020] Figure 4 It is a partial three-dimensional schematic diagram of the present invention.

[0021] Figure 5 It is a three-dimensional schematic diagram of the center line clamp connecting piece and the gripping rod of the present invention.

[0022] In the figure: 1. Grip; 11. Limiting slide; 2. Rotating end cover; 31. Grip; 32. Rotating rod; 321. External threaded portion; 33. Protective cover; 4. Lifting cylinder; 41. Limiting protrusion; 42. Internal threaded portion; 5. Abutment; 6. Support connecting rod; 7. Contact member; 8. Connecting wire; 81. Bending and contracting section; 82. Sliding fastener; 9. Wire clamp connecting piece; 10. Conductive sliding disk. DETAILED DESCRIPTION

[0023] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0024] Combine Figure 1 - Figure 5 , the present invention provides the following embodiments: A variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device comprises: a grip tube 1, a hand-rotating rod assembly, a lifting tube 4, abutment 5, a supporting link 6, a contact member 7, a connecting wire 8 and a connecting wire 8. The grip tube 1 is held by hand, and the hand-rotating rod assembly is rotated with the other hand, thereby driving the lifting tube 4 to move up and down. Due to the relationship between the supporting link 6, the abutment 5 is synchronously expanded during the process of the lifting tube 4 extending outward, thereby realizing diameter change and adapting to the connection of plum blossom contacts of different sizes and specifications. The contact member 7 is counteracted by the spring of the plum blossom contact, and self-locking can be achieved when the hand rotation stops, and the connection is stable.

[0025] When the lifting cylinder 4 is extended outward from the top of the handle 1, the supporting rod 6 is connected to the lifting cylinder 4, and the supporting rod 6 is connected at both ends of the handle 1.

[0026] Several contact members 7 are also designed and positioned at the top of the abutment member 5. Connecting wires 8 are connected to the outer curved surfaces of the contact members 7, which are electrically connected to the clamp connection piece 9. After the above adjustments, the contact members 7 pass through the gaps between the contact pieces of the plum blossom contact and abut against the spring. Then, a test clamp is connected to the clamp connection piece 9, ensuring a stable connection and avoiding interruptions in the test.

[0027] As another preferred embodiment of the present invention, the hand-rotating lever assembly includes a grip 31 and a rotating lever 32. The rotating lever 32 extends through the rotating end cover 2 and into the interior of the lifting cylinder 4. Specifically, in conjunction with the accompanying drawings, in this embodiment, the rotating lever 32 is vertically located in the middle of the grip 31. The rotating lever 32 and the grip 31 can be an integrated structure. The grip 31 is grasped by hand to facilitate the rotation operation. In this embodiment, the grip 31 and the rotating lever 32 are made of insulating materials. In this embodiment, the rotating end cover 2 can also be replaced by bearings and other components. The rotating end cover 2 serves to fix the rotating lever 32 and ensure that the rotating lever 32 can rotate.

[0028] As another preferred embodiment of the present invention, the rotary rod 32 is rotatably connected to the rotary end cover 2, the rotary rod 32 is provided with an external thread portion 321, and the inner wall of the lifting cylinder 4 is provided with an internal thread portion 42. Figure 3 Specifically, the rotary rod 32 is rotatably connected to the rotary end cover 2, the rotary end cover 2 is fixedly installed at the bottom opening of the grip tube 1, the external thread portion 321 is engaged with the internal thread portion 42 to form a threaded connection, and the grip rod 31 is rotated to drive the rotary rod 32 to rotate on the inner wall of the lifting tube 4.

[0029] As another preferred embodiment of the present invention, a limiting protrusion 41 is vertically provided on the outer wall of the lifting cylinder 4, and a limiting sliding groove 11 is provided on the inner wall of the grip cylinder 1. Figure 3In this embodiment, the limiting protrusion 41 and the limiting groove 11 are used for limiting. After limiting, the lifting cylinder 4 can only be extended and retracted up and down in the grip cylinder 1, and no relative rotation will occur between the two.

[0030] As another preferred embodiment of the present invention, four contact members 7 are provided, distributed circumferentially, with the bottom surfaces of the contact members 7 being crescent-shaped. Specifically, in this embodiment, the contact members 7 are located at the top of the abutment member 5, with the bottom end of the abutment member 5 serving as the connection end. As the abutment member 5 expands outward, the contact members 7 also expand outward synchronously, with the arc-shaped inner walls of the contact members 7 contacting the plum blossom contact spring.

[0031] As another preferred embodiment of the present invention, the connecting wire 8 includes a bending and contraction section 81 and a sliding fastener 82, and the bending and contraction section 81 is located in the inner cavity of the lifting cylinder 4. Figure 4 Specifically, during the diameter adjustment, the connecting wire 8 needs to be stretched to a certain extent. In order to ensure that the connecting wire 8 will not be broken, a bending and contraction section 81 is designed to meet the diameter change requirements and can also be automatically recovered.

[0032] As another preferred embodiment of the present invention, a conductive sliding disc 10 is provided at the top of the rotary rod 32, the sliding buckle 82 is slidably connected to the conductive sliding disc 10, and the conductive sliding disc 10 is electrically connected to the wire clamp connecting piece 9. Figure 4 In this embodiment, the wire clamp connecting piece 9 is provided on the hand-rotating rod assembly. In order to prevent the connecting wire 8 from being twisted and broken by rotation, an electrical connection is made between the connecting wire 8 and the wire clamp connecting piece 9 in the form of a slip ring. Specifically, the sliding buckle 82 is opened on the conductive sliding disk 10, and the conductive sliding disk 10 is provided with raised edges at the top and bottom. The sliding buckle 82 can slide on the raised edges of the conductive sliding disk 10. Therefore, when the hand-rotating rod assembly rotates, the connecting wire 8 is not easily entangled and twisted, and its stable electrical connection relationship can be guaranteed.

[0033] As another preferred embodiment of the present invention, two wire clamp connecting pieces 9 are provided, and the wire clamp connecting pieces 9 are located at the two end faces of the grip rod 31. Protective covers 33 for protecting the wire clamp connecting pieces 9 are also provided at both ends of the grip rod 31. In this embodiment, the wire clamp connecting piece 9 is provided at the end of the grip rod 31 and is protected by a protective cover 33 to increase safety. In addition, the wire clamp can be conveniently connected to the wire clamp connecting piece 9 to ensure a stable connection with the wire clamp. The design of the two wire clamp connecting pieces 9 provides more options, and the appropriate wire clamp connecting piece 9 is selected to ensure convenient operation.

[0034] As another preferred embodiment of the present invention, the contact member 7, the connecting wire 8, the wire clamp connecting piece 9 and the conductive sliding plate 10 are all made of copper. Specifically, in the present invention, each electrical connection component has good conductivity to ensure measurement accuracy.

[0035] As another preferred embodiment of the present invention, the inner surface of the contact member 7 and the outer surface of the wire clamp connecting piece 9 are silver-plated. Specifically, silver has high thermal conductivity and electrical conductivity as well as relatively low hardness, which will produce a very low contact resistance value, making it attractive in high-voltage applications.

[0036] In this embodiment, the expansion or contraction of the abutment 5 is adjusted by rotation. Hands hold the grip tube 1 and the grip rod 31 respectively, insert the abutment 5 into the plum blossom contact and connect it, and then rotate the grip rod 31. Due to the threaded connection structure between the rotating rod 32 and the lifting cylinder 4, and the limit of the lifting cylinder 4 and the grip tube 1, after the grip rod 31 is rotated, the lifting cylinder 4 is driven to extend and retract in the grip tube 1. During the process of the lifting cylinder 4 extending outward, due to the action of the supporting connecting rod 6, the abutment 5 at the top of the lifting cylinder 4 deflects outward during the extension process, and the four abutment members 5 deflect synchronously to realize the expansion of the contact member 7 until the contact member 7 passes through the contact gap of the plum blossom contact and resists the spring of the plum blossom contact.

[0037] Then, the protective cover 33 can be removed by screwing to expose the wire clamp connecting piece 9 , and the test wire clamp can be connected to the wire clamp connecting piece 9 to carry out the test experiment.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device, characterized in that: include: A grip tube (1), wherein a lifting tube (4) is slidably installed in the grip tube (1), a hand-rotating rod assembly is threadedly connected to the inner wall of the lifting tube (4), and the hand-rotating rod assembly is rotatably installed on the bottom of the grip tube (1) by rotating the end cover (2), and a support member (5) is rotatably connected to the top of the lifting tube (4), and the support member (5) and the top of the grip tube (1) are connected via a supporting connecting rod (6), and both ends of the supporting connecting rod (6) are rotatably connected; A plurality of contact members (7), wherein the plurality of contact members (7) are arranged at the top end of the abutting member (5), the outer arc surface of the contact member (7) is connected with a connecting wire (8), and the connecting wire (8) is electrically connected to a wire clamp connecting piece (9).

2. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 1 is characterized in that: The hand-rotating rod assembly comprises a gripping rod (31) and a rotating rod (32), and the rotating rod (32) passes through the rotating end cover (2) and extends into the interior of the lifting cylinder (4).

3. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 2, characterized in that: The rotary rod (32) is rotatably connected to the rotary end cover (2), an external thread portion (321) is provided on the rotary rod (32), and an internal thread portion (42) is provided on the inner wall of the lifting cylinder (4).

4. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 3, characterized in that: A limiting protrusion (41) is vertically provided on the outer wall of the lifting cylinder (4), and a limiting sliding groove (11) is provided on the inner wall of the grip cylinder (1).

5. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 4, characterized in that: Four contact pieces (7) are provided, the four contact pieces are distributed in a circumference, and the bottom surface of the contact piece (7) is crescent-shaped.

6. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 5, characterized in that: The connecting wire (8) comprises a bending and contracting section (81) and a sliding fastener (82), and the bending and contracting section (81) is located in the inner cavity of the lifting cylinder (4).

7. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 6, characterized in that: A conductive sliding disk (10) is provided at the top end of the rotary rod (32), the sliding fastener (82) is slidably connected to the conductive sliding disk (10), and the conductive sliding disk (10) is electrically connected to the wire clamp connecting piece (9).

8. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 2, characterized in that: Two wire clamp connecting pieces (9) are provided, and the wire clamp connecting pieces (9) are located at two end surfaces of the gripping rod (31). Protective covers (33) for protecting the wire clamp connecting pieces (9) are also provided at both ends of the gripping rod (31).

9. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 7, characterized in that: The contact member (7), the connecting wire (8), the wire clamp connecting piece (9) and the conductive sliding disk (10) are all made of copper.

10. The variable diameter switch cabinet trolley switch loop resistance measurement auxiliary device according to claim 9, characterized in that: The inner surface of the contact piece (7) and the outer surface of the wire clamp connecting piece (9) are silver-plated.

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