Compression spring type clamp-on current transformer

Abstract

The application discloses a compression spring type clamp-on current transformer, which comprises a movable handle and a static handle, and a hinge shaft is arranged in the middle of the movable handle and the static handle, one side of the hinge shaft is a jaw end, the other side is a handle end, the handle end is provided with an elastic assembly, the elastic assembly drives the jaw end to automatically close, the elastic assembly comprises a compression spring, a male spring groove and a female spring groove, the female spring groove is arranged in the handle end of the movable handle, the male spring groove is arranged in the handle end of the static handle, the male spring groove is matched with the female spring groove, the open end of the male spring groove is inserted into the opening of the female spring groove, and the compression spring is arranged in the male spring groove and the female spring groove. The compression spring in the shape of a spring is arranged between the movable handle and the static handle, so that the device is more durable, and can still maintain a good elastic state after long-time use. The jaw opening degree maintaining structure is arranged, and the jaw opening degree can be locked at any angle when the jaw is opened by using the ratchet principle.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, specifically to a spring-loaded clamp-on current transformer. Background Technology

[0002] Traditional clamp-on current transformers use a fork spring design. The disadvantage of fork springs is that their spring force decreases over time. In particular, clamp-on current transformers need to be opened and closed frequently, which accelerates the deterioration of the spring force. Ultimately, this leads to poor contact at the end face of the clamp-on current transformer and a decline in performance.

[0003] For example, application number CN200520021741.4 discloses a clamp-type current transformer. It includes a housing composed of two symmetrical parts connected by a pin to form a clamp shape; an iron core, also composed of two symmetrical parts, installed in the upper part of the housing; an induction coil wound around the iron core; an automatic adjustment device mounted on the iron core; and a spring installed in the lower part of the housing. The center of the spring is fitted onto the pin connecting the two housing parts, and the tail end is supported by a stop block against the inner wall of the two housing parts. This spring is a fork spring structure, which is prone to elasticity reduction after prolonged use.

[0004] Secondly, in the existing clamp-on current transformer, the jaws are opened by gripping the handle with your hand. In some applications, it is necessary to maintain the jaw opening and place the circuit wires into the jaws for measurement. During the process of maintaining the jaw opening, one hand must grip the handle and the other hand can only be used to organize the wires. Organizing the wires with one hand is quite strenuous, and it is difficult to keep the jaws open when organizing the wires with both hands.

[0005] In view of the above, it is necessary to propose a spring-loaded clamp-on current transformer to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems and provide a spring-loaded clamp-on current transformer.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a spring-loaded clamp-on current transformer, comprising a moving handle and a stationary handle, wherein a hinge shaft is provided in the middle of the moving handle and the stationary handle, one side of the hinge shaft is a jaw end, and the other side is a handle end, wherein the handle end is provided with an elastic component, the elastic component driving the jaw end to close automatically, the elastic component comprising a compression spring, a male spring groove, and a female spring groove, wherein the female spring groove is disposed in the handle end of the moving handle, the male spring groove is disposed in the handle end of the stationary handle, the male spring groove and the female spring groove cooperate, the open end of the male spring groove is inserted into the opening of the female spring groove, and the compression spring is placed in the male spring groove and the female spring groove.

[0008] Furthermore, the bottom of the male groove of the spring is a male groove base plate, the bottom of the female groove of the spring is a female groove base plate, one end of the compression spring is fixedly connected to the male groove base plate, and the other end is fixedly connected to the female groove base plate.

[0009] Furthermore, the jaws are provided with semi-circular rings inside both the moving and stationary handles. When the jaws are closed, the ends of the two semi-circular rings close to form a ring-shaped structure.

[0010] Furthermore, the hinge shaft portion is also provided with a jaw opening retention structure, and the hinge shaft portion is provided with a cylindrical hollow accommodating space, and the jaw opening retention structure is disposed within the accommodating space.

[0011] Furthermore, the jaw end has a closed stop point and a fully open stop point, and the jaw opening retention structure keeps the jaws fixed at multiple opening degrees during the opening process of the jaw end; and the jaw opening does not lock during the process of closing from the fully open stop point to the closed stop point.

[0012] Furthermore, the jaw opening retention structure includes a moving structure disposed within the moving handle and a stationary structure disposed within the stationary handle, both of which are disposed within the accommodating space.

[0013] Furthermore, the static structure includes a ratchet disc, a left guide plate, and a right guide plate. The ratchet disc has a ratchet portion on its outer periphery and is fixedly installed inside the static handle. The left guide plate and right guide plate are fixedly installed on the left and right sides of the ratchet disc, respectively.

[0014] Furthermore, the moving structure includes a swing plate and a tension spring. The swing plate is an arc-shaped plate with a locking tooth at one end, which engages with a ratchet portion. Rollers are provided on the outer sides of both ends of the swing plate, and the rollers engage with the left guide plate and the right guide plate, respectively. The swing plate is provided with a rotating shaft and a first pull rod. The swing plate is rotatably connected to the moving handle through the rotating shaft. A second pull rod is fixedly provided on the outer side of the swing plate by the moving handle. A tension spring is stretched between the first pull rod and the second pull rod. The rotating shaft is located between the first pull rod and the second pull rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention sets a spring-like compression spring between the moving handle and the stationary handle, making the device more durable and able to maintain a good elastic state even after long-term use. The jaw opening retention structure uses the ratchet principle to facilitate maintaining the opening at any angle when the jaws are opened, and in conjunction with the use of the guide plate, the swing plate rotates when the handle reaches the open or closed stop point, thereby controlling the locking and unlocking of the opening retention structure. Attached Figure Description

[0016] Figure 1 This is an external structural diagram of a spring-loaded clamp-on current transformer according to this application;

[0017] Figure 2 This is a diagram showing the open and closed states of the spring-loaded clamp-on current transformer of this application;

[0018] Figure 3 This is a structural diagram of the opening retention structure of this application, showing its movement from the closed stop point to the fully open stop point.

[0019] Figure 4 This is a structural diagram of the opening retention structure of this application, showing its movement from the fully open dead center to the closed dead center.

[0020] In the diagram: 1. Moving handle; 2. Stationary handle; 3. Hinge shaft; 4. Compression spring; 5. Spring male groove; 6. Spring female groove; 7. Male groove base plate; 8. Female groove base plate; 9. Semicircular ring assembly; 10. Accommodation space; 11. Ratchet plate; 12. Left guide plate; 13. Right guide plate; 14. Swing plate; 15. Tension spring; 16. Clamping tooth; 17. Roller; 18. Rotating shaft; 19. First pull rod; 20. Second pull rod. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Example 1:

[0023] A spring-loaded clamp-on current transformer, such as Figure 1 As shown, it includes a movable handle 1 and a stationary handle 2. A hinge shaft 3 is provided in the middle of the movable handle 1 and the stationary handle 2. One side of the hinge shaft 3 is the jaw end and the other side is the handle end. When in use, hold the handle end and squeeze it. Using the lever principle, the jaw end can be opened, so that the wire can be passed into the jaw. The jaw end is provided with a semi-circular ring group 9 inside the movable handle 1 and the stationary handle 2. When the jaw is closed, the ends of the two semi-circular ring groups 9 close to form a ring structure.

[0024] The handle end is provided with an elastic component, which drives the jaw end to close automatically, such as... Figure 2As shown, the elastic component includes a compression spring 4, a male spring groove 5, and a female spring groove 6. The female spring groove 6 is located inside the handle end of the moving handle 1, and the male spring groove 5 is located inside the handle end of the stationary handle 2. The male spring groove 5 and the female spring groove 6 mate, with the open end of the male spring groove 5 inserted into the opening of the female spring groove 6. The compression spring 4 is placed inside the male spring groove 5 and the female spring groove 6. Unlike the elastic components using fork springs in the prior art, the compression spring 4 has better elasticity and service life, and its elasticity does not easily decline during long-term use. The inner bottom of the male spring groove 5 is a male groove base plate 7, and the inner bottom of the female spring groove 6 is a female groove base plate 8. One end of the compression spring 4 is fixedly connected to the male groove base plate 7, and the other end is fixedly connected to the female groove base plate 8. In use, gripping the handle compresses the compression spring 4 through the handles on both sides. Releasing the hand releases the elasticity of the compression spring 4, closing the jaws.

[0025] Example 2:

[0026] This embodiment further improves upon the above embodiment, enabling the clamp-on current transformer to maintain the opening angle of the jaws at any angle during the clamping process, thereby freeing up both hands to manage wires. Specifically, the hinge shaft 3 also includes a jaw opening retention structure, and the hinge shaft 3 has a cylindrical hollow accommodating space 10, within which the jaw opening retention structure is disposed. The jaw end has a closed stop point and a fully open stop point, such as... Figure 3 The diagram shows the process of moving from the closed stop point to the fully open stop point. The arrows in the diagram indicate the direction of motion of the moving structure. Figure 4 The diagram shows the process of moving from the fully open dead center to the closed dead center. The arrows in the diagram indicate the direction of motion of the moving structure.

[0027] The jaw opening retention structure keeps the jaws fixed at multiple opening degrees during the jaw opening process. Utilizing the ratchet principle, the jaw opening can be locked at multiple angles during the jaw opening process; and the jaw opening is not locked during the process of closing from the fully open stop point to the closed stop point; by using the left and right guide plates 13 to change the angle of the swing plate 14, the locking teeth 16 are controlled to not contact the ratchet part when the jaws are closed, so that the opening is not locked when closed.

[0028] Specifically, the jaw opening retention structure includes a moving structure disposed within the moving handle 1 and a stationary structure disposed within the stationary handle 2, both of which are located within the accommodating space 10. For example... Figure 3 , Figure 4 As shown, the static structure includes a ratchet disc 11, a left guide plate 12, and a right guide plate 13. The ratchet disc 11 has a ratchet portion on its outer periphery. The ratchet disc 11 is fixedly installed inside the static handle 2. The left guide plate 12 and the right guide plate 13 are fixedly installed on the left and right sides of the ratchet disc 11, respectively.

[0029] The moving structure is designed to coordinate with the stationary structure. The moving structure includes a swing plate 14 and a tension spring 15. The swing plate 14 is an arc-shaped plate. One end of the swing plate 14 is provided with a locking tooth 16, which engages with a ratchet portion to lock the jaw opening. Rollers 17 are provided on the outer sides of both ends of the swing plate 14. The rollers 17 engage with the left guide plate 12 and the right guide plate 13, respectively. The swing plate 14 is provided with a rotating shaft 18 and a first pull rod 19. The swing plate 14 is rotatably connected to the moving handle 1 through the rotating shaft 18. A second pull rod 20 is fixedly provided on the outer side of the swing plate 14 in the moving handle 1. A tension spring 15 is stretched between the first pull rod 19 and the second pull rod 20. The rotating shaft 18 is located between the first pull rod 19 and the second pull rod 20.

[0030] like Figure 3 As shown by the arrow, the jaws are opening in the direction indicated by the arrow. At this time, the handle 1 controls the swing plate 14 to rotate around the hinge shaft 3. During this process, the pivot 18 remains to the left of the tension spring 15, so the tension spring 15 can pull the swing plate 14, causing the locking teeth 16 to engage with the ratchet teeth. During the opening process, the tension spring 15 always controls the locking teeth 16 to engage with the corresponding ratchet teeth, so even if the user releases their hand, the jaws can remain open. After the wire is secured inside the jaws, gripping the handle again and pressing the handle 1 moves the jaw opening structure to the fully open stop on the right side. At this time, the roller 17 on the right side of the swing plate 14, guided by the right guide plate 13, causes the swing plate 14 to rotate around the pivot shaft 18. Figure 4 As shown, the rotating shaft 18 is positioned to the right of the tension spring 15. At this time, the tension spring 15 pulls the locking tooth 16 up, thus disengaging the locking tooth 16 from the ratchet portion. Therefore, the jaw opening is not locked during the jaw closing process, allowing the semi-circular annular assembly 9 to close and enabling circuit measurements. Figure 4 As shown, when the swing plate 14 moves to the left guide plate 12, the left roller 17, under the action of the left guide plate 12, changes the angle of the swing plate 14 again, so that the locking teeth 16 can engage with the ratchet teeth, thereby locking the opening degree again when the jaws are opened next time. This structure... Figure 3 and Figure 4 The two processes shown can be switched automatically, which works well.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A spring-loaded clamp-on current transformer, comprising a moving handle (1) and a stationary handle (2), wherein a hinge shaft (3) is provided at the middle of the moving handle (1) and the stationary handle (2), one side of the hinge shaft (3) being a clamping jaw end and the other side being a handle end, characterized in that, The handle end is provided with an elastic component, which drives the jaw end to close automatically. The elastic component includes a compression spring (4), a male spring groove (5), and a female spring groove (6). The female spring groove (6) is located in the handle end of the moving handle (1), and the male spring groove (5) is located in the handle end of the stationary handle (2). The male spring groove (5) and the female spring groove (6) cooperate with each other. The open end of the male spring groove (5) is inserted into the opening of the female spring groove (6). The compression spring (4) is placed in the male spring groove (5) and the female spring groove (6). The hinge shaft (3) is also provided with a jaw opening retention structure. The hinge shaft (3) is provided with a cylindrical hollow accommodating space (10). The jaw opening retention structure is located in the accommodating space (10). The jaws have a closed stop point and a fully open stop point. The jaw opening retention structure keeps the jaws fixed at multiple opening degrees during the opening process of the jaws. Furthermore, the jaws do not lock the jaw opening during the process of closing from the fully open stop point to the closed stop point.

2. A spring-loaded clamp-on current transformer according to claim 1, characterized in that, The bottom of the male groove (5) of the spring is the male groove base plate (7), and the bottom of the female groove (6) of the spring is the female groove base plate (8). One end of the compression spring (4) is fixedly connected to the male groove base plate (7), and the other end is fixedly connected to the female groove base plate (8).

3. A spring-loaded clamp-on current transformer according to claim 1, characterized in that, The jaws are provided with semi-circular rings (9) inside the moving handle (1) and the stationary handle (2). When the jaws are closed, the ends of the two semi-circular rings (9) close to form a ring structure.

4. A spring-loaded clamp-on current transformer according to claim 1, characterized in that, The jaw opening retention structure includes a moving structure disposed in the moving handle (1) and a stationary structure disposed in the stationary handle (2), both of which are disposed within the accommodating space (10).

5. A spring-loaded clamp-on current transformer according to claim 4, characterized in that, The static structure includes a ratchet disc (11), a left guide plate (12), and a right guide plate (13). The ratchet disc (11) has a ratchet portion on its outer periphery. The ratchet disc (11) is fixedly installed inside the static handle (2). The left guide plate (12) and the right guide plate (13) are fixedly installed on the left and right sides of the ratchet disc (11), respectively.

6. A spring-loaded clamp-on current transformer according to claim 5, characterized in that, The moving structure includes a swing plate (14) and a tension spring (15). The swing plate (14) is an arc-shaped plate. One end of the swing plate (14) is provided with a locking tooth (16). The locking tooth (16) cooperates with the ratchet part. Rollers (17) are provided on the outer sides of both ends of the swing plate (14). The rollers (17) cooperate with the left guide plate (12) and the right guide plate (13) respectively. The swing plate (14) is provided with a rotating shaft (18) and a first pull rod (19). The swing plate (14) is rotatably connected to the moving handle (1) through the rotating shaft (18). The moving handle (1) is fixedly provided with a second pull rod (20) on the outer side of the swing plate (14). A tension spring (15) is provided between the first pull rod (19) and the second pull rod (20). The rotating shaft (18) is located between the first pull rod (19) and the second pull rod (20).

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