A digital voltmeter wire anti-disconnection structure

Abstract

The utility model relates to digital voltmeter technical field discloses a kind of wiring anti-drop structure of digital voltmeter, including digital voltmeter body and connecting line, the one end of connecting line is equipped with connector, the front of digital voltmeter body is equipped with interface, connector is cooperatively installed inside interface, the outside of interface is equipped with anti-drop structure.This utility model is with the mechanical clamping action of ball and ring groove, the rigid lock of connector and interface in axial direction, even if cable is accidentally pulled or instrument produces vibration, connector cannot produce axial slip relative to interface, the normal pressure of contact surface and effective contact area remain stable, to avoid the problem of contact resistance sudden increase and signal transient break, guarantee the continuity of measurement reading and data accuracy, simultaneously, because contact state is stable and reliable, also eliminate the hidden danger of electric spark due to poor contact under high voltage measurement scene, improve the safety of field operation.

Description

Technical Field

[0001] This utility model relates to the field of digital voltmeter technology, specifically to a wiring anti-disconnection structure for a digital voltmeter. Background Technology

[0002] A digital voltmeter is an electronic instrument that uses an internal high-precision analog-to-digital converter to quantize continuously changing analog voltage signals into digital codes in real time, and relies on a microprocessor for decoding and error correction, ultimately displaying the measurement results directly on the screen as specific values.

[0003] In existing technologies, when using digital voltmeters, operators directly insert the connector of the connecting cable into the instrument interface, relying on the interference fit between the connector and the spring inside the interface to achieve electrical conduction. However, in actual operation, when the instrument is frequently moved or the cable is accidentally pulled, the connector is prone to slight slippage inside the interface, resulting in a sudden increase in contact resistance or even momentary signal interruption. This not only causes large fluctuations in the measurement reading and affects the accuracy of the data, but may also generate electric sparks due to poor contact during high-voltage measurements, posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to provide a wiring anti-disconnection structure for a digital voltmeter, which solves the problem in the prior art where the connector and interface are connected only by the friction of plugging and unplugging, which is prone to relative displacement when subjected to external force pulling or vibration, resulting in poor contact, inaccurate measurement data, or even safety hazards.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a wiring anti-disconnection structure for a digital voltmeter, comprising a digital voltmeter body and a connecting wire. One end of the connecting wire is provided with a connector. The front of the digital voltmeter body has an interface, and the connector is fitted inside the interface. An anti-disconnection structure is sleeved on the outside of the interface. The anti-disconnection structure includes a connecting plate, and a first sleeve is provided on the outside of the connecting plate. The first sleeve has multiple mounting holes on its outside, and a ball bearing is rolled inside each mounting hole. A second sleeve is sleeved on the outside of the connecting wire, and an annular groove is provided on its outside. One end of the ball bearing abuts against the inner wall of the annular groove. The second sleeve is fitted inside the first sleeve. A movable sleeve is slidably connected to the outside of the first sleeve, and the inner wall of the movable sleeve abuts against the other end of the ball bearing.

[0006] Furthermore, the connecting plate is fixedly installed on the front of the digital voltmeter body by bolts, and an opening is provided in the middle of the connecting plate, with the interface located inside the opening.

[0007] Furthermore, one end of the second sleeve is provided with a ring, one end of which is fixedly mounted with a spring, and the other end of which is fixedly mounted on the outside of the connecting plate. The spring is sleeved on the outside of the movable sleeve.

[0008] Furthermore, a pressing block is provided at the end of the ring body away from the spring, and inclined surfaces are provided at both ends of the ring groove.

[0009] Furthermore, a threaded hole is provided on the outer side of the second sleeve, and a locking bolt is threaded into the inner side of the threaded hole. One end of the locking bolt abuts against the outer side of the connecting line.

[0010] Furthermore, a third sleeve is provided on the outer side of the connecting plate, and the spring, the movable sleeve and the first sleeve are all located inside the third sleeve. The ring body is slidably connected inside the third sleeve, and the connecting plate, the first sleeve and the third sleeve are integrally formed structures.

[0011] This utility model has the following beneficial effects: (1) This utility model provides an inwardly tiltable ball bearing inside the first sleeve, which works in conjunction with the annular groove on the second sleeve and a movable sleeve that slides on the outside of the first sleeve. When the movable sleeve returns to its original position, it squeezes the ball bearing to engage with the annular groove, thus achieving rigid axial locking between the first and second sleeves. At the same time, the spring connected to the end of the second sleeve via the ring body is compressed during installation, and its return force always pushes the second sleeve to tend to disengage outward, ensuring that the inner wall of the annular groove always maintains tight contact with the ball bearing, eliminating axial clearance. Compared with the prior art, which relies solely on insertion and extraction friction, this method provides a more robust solution. The connection is maintained by a mechanical locking mechanism between the ball bearings and the annular groove, which rigidly locks the connector and interface in the axial direction. Even if the cable is accidentally pulled or the instrument vibrates, the connector cannot slide axially relative to the interface. The normal pressure and effective contact area of ​​the contact surface remain stable, thus avoiding the problems of sudden increase in contact resistance and instantaneous signal interruption. This ensures the continuity of measurement readings and the accuracy of data. At the same time, due to the stable and reliable contact state, the hidden danger of electric sparks caused by poor contact in high-voltage measurement scenarios is also eliminated, improving the safety of on-site operation.

[0012] (2) In the process of placing the second sleeve on the outside of the connecting line, the operator first inserts the connecting line into the second sleeve and adjusts it to an appropriate position. Then, the operator screws the locking bolt in the threaded hole on the outside of the second sleeve, so that the end of the locking bolt is pushed into the inside of the second sleeve until its end is tightly against the outer skin of the connecting line, thereby fixing the second sleeve and the connecting line into a whole. The setting of the locking bolt makes the second sleeve and the connecting line no longer a sleeve relationship, but a rigid connection is achieved through the radial clamping force of the locking bolt. When the anti-detachment structure is subjected to axial tension, the tension will be directly transmitted to the second sleeve and the first sleeve through the locking bolt, and will not be transmitted to the contact part of the joint and the interface. This avoids the ball and the ring groove from misaligning and disengaging due to the connecting line moving inside the second sleeve, and further improves the locking reliability of the anti-detachment structure.

[0013] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the existing medium-tech product structure; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is an exploded view of the overall structure of this utility model; Figure 4 This is an exploded view of the anti-detachment structure of this utility model; Figure 5 This is a cross-sectional view of the anti-detachment structure of this utility model; The attached diagram lists the components represented by each number as follows: In the diagram: 1. Digital voltmeter body; 101. Interface; 2. Connecting wire; 201. Connector; 3. Anti-disconnection structure; 301. Connecting plate; 302. First sleeve; 303. Ball bearing; 304. Second sleeve; 305. Ring groove; 306. Moving sleeve; 307. Ring body; 308. Spring; 309. Pressing block; 310. Locking bolt; 311. Third sleeve. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-5 As shown, this utility model is a wiring anti-disconnection structure for a digital voltmeter, including a digital voltmeter body 1 and a connecting wire 2. One end of the connecting wire 2 is provided with a connector 201. The front of the digital voltmeter body 1 is provided with an interface 101. The connector 201 is installed inside the interface 101. An anti-disconnection structure 3 is sleeved on the outside of the interface 101. The anti-disconnection structure 3 includes a connecting plate 301. A first sleeve 302 is provided on the outside of the connecting plate 301. Multiple mounting holes are provided on the outside of the first sleeve 302. A ball bearing 303 is rolled inside each mounting hole. A second sleeve 304 is sleeved on the outside of the connecting wire 2. An annular groove 305 is provided on the outside of the second sleeve 304. One end of the ball bearing 303 abuts against the inner wall of the annular groove 305. The second sleeve 304 is installed inside the first sleeve 302. A movable sleeve 306 is slidably connected to the outside of the first sleeve 302. The inner wall of the movable sleeve 306 abuts against the other end of the ball bearing 303. The second sleeve 304 has a ring 307 at one end, a spring 308 is fixedly installed at one end of the ring 307, and the other end of the spring 308 is fixedly installed on the outside of the connecting plate 301. The spring 308 is sleeved on the outside of the movable sleeve 306. First, place the digital voltmeter body 1 upright with its front facing upwards. Then, align the connector 201 at the end of the connecting wire 2 with the interface 101 and insert it into place. Next, hold the movable sleeve 306 and slide it along the outer wall of the first sleeve 302 towards the connecting plate 301. At this time, the inner wall of the movable sleeve 306 releases the pressure on the ball bearing 303, and the ball bearing 303 is in a free state. Then, insert the second sleeve 304 into the first sleeve 302. During this process, the ring 307 at the end of the second sleeve 304 compresses the spring 308. When the second sleeve 304 is fully inserted... After insertion, the movable sleeve 306 is released, and the restoring force of the spring 308 pushes the second sleeve 304 outward through the ring body 307 until the annular groove 305 on the outer wall of the second sleeve 304 is aligned with the positions of each mounting hole. Finally, the movable sleeve 306 is slid back to its original position away from the connecting plate 301, and the inner wall of the movable sleeve 306 re-presses the ball 303, forcing the ball 303 to tilt inward and get stuck in the annular groove 305, abutting against the inner wall of the annular groove 305, thereby achieving axial locking between the first sleeve 302 and the second sleeve 304, that is, completing the anti-disengagement locking of the connector 201. The connecting plate 301 is fixedly installed on the front of the digital voltmeter body 1 by bolts. The connecting plate 301 has an opening in the middle, and the interface 101 is located inside the opening. A pressing block 309 is provided at the end of the ring body 307 away from the spring 308, and inclined surfaces are provided at both ends of the ring groove 305; When disassembling the connecting wire 2, the operator first slides the movable sleeve 306 towards the connecting plate 301 to release its constraint on the ball 303. Then, the operator directly presses the pressing block 309 on the ring body 307. The pressing block 309 applies force to push the ring body 307 into the first sleeve 302 and compress the spring 308, causing the second sleeve 304 to have an inward axial displacement. At this time, the annular groove 305 moves inward along with the second sleeve 304. The ball 303, which was originally stuck in the annular groove 305, is squeezed outward under the guidance of the inclined surface at the end of the annular groove 305. The locking constraint between the ball 303 and the annular groove 305 is quickly released, and the operator can then pull the connecting wire 2 outward. After releasing the pressing block 309, the spring 308 automatically resets. The outer side of the second sleeve 304 is provided with a threaded hole, and a locking bolt 310 is threadedly connected inside the threaded hole. One end of the locking bolt 310 abuts against the outer side of the connecting line 2. During the process of fitting the second sleeve 304 onto the outside of the connecting wire 2, the operator first inserts the connecting wire 2 into the second sleeve 304 and adjusts it to the appropriate position. Then, the operator tightens the locking bolt 310 in the threaded hole on the outside of the second sleeve 304, pushing the end of the locking bolt 310 into the second sleeve 304 until its end tightly abuts against the outer sheath of the connecting wire 2. This fixes the second sleeve 304 and the connecting wire 2 as a single unit. The locking bolt 310 ensures that the second sleeve 304 and the connecting wire 2 are properly integrated. The connecting wires 2 are no longer in a sleeved relationship, but are rigidly connected by the radial clamping force of the locking bolt 310. When the anti-detachment structure 3 is subjected to axial tension, the tension will be directly transmitted to the second sleeve 304 and the first sleeve 302 through the locking bolt 310, and will not be transmitted to the contact part between the connector 201 and the interface 101. This avoids the ball 303 from being misaligned and disengaged from the annular groove 305 due to the connecting wire 2 moving inside the second sleeve 304, and further improves the locking reliability of the anti-detachment structure 3. A third sleeve 311 is provided on the outer side of the connecting plate 301. The spring 308, the movable sleeve 306 and the first sleeve 302 are all located inside the third sleeve 311. The ring body 307 is slidably connected inside the third sleeve 311. The connecting plate 301, the first sleeve 302 and the third sleeve 311 are integrally formed structures.

[0018] In use, the operator first places the digital voltmeter body 1 upright with its front facing upwards. Then, aligns the connector 201 at the end of the connecting wire 2 with the interface 101 and inserts it into place. Next, the connecting wire 2 is threaded through the second sleeve 304, and the locking bolt 310 in the threaded hole on the outside of the second sleeve 304 is tightened so that the end of the locking bolt 310 presses against the outer sheath of the connecting wire 2, thus fixing the second sleeve 304 and the connecting wire 2 together. Then, the moving sleeve 306 is slid along the outer wall of the first sleeve 302 towards the connecting plate 301, so that the inner wall of the moving sleeve 306 releases the pressure on the ball bearing 303, and the second sleeve 304 is inserted into the first sleeve 302. At this time, the end of the second sleeve 304... The ring body 307 compresses the spring 308. After the second sleeve 304 is fully installed, the movable sleeve 306 is released. The restoring force of the spring 308 pushes the second sleeve 304 outward through the ring body 307 until the annular groove 305 on the outer wall of the second sleeve 304 is aligned with the positions of each mounting hole. Then, the movable sleeve 306 is slid back to its original position away from the connecting plate 301. The inner wall of the movable sleeve 306 re-presses the ball 303, forcing the ball 303 to tilt inward and slide into the annular groove 305 along the inclined surface at the end of the annular groove 305, where it tightly abuts. Thus, the axial locking of the first sleeve 302 and the second sleeve 304 is achieved through the engagement of the ball 303 and the annular groove 305, completing the installation. During disassembly, first slide the movable sleeve 306 closer to the connecting plate 301 to release the pressure on the ball bearing 303. Then press the pressing block 309 on the ring body 307 to push the ring body 307 into the first sleeve 302 and further compress the spring 308, causing the second sleeve 304 and the annular groove 305 to move inward together. The ball bearing 303 in the annular groove 305 is squeezed out under the guidance of the inclined surface at the end of the annular groove 305. After the locking constraint is completely released, the operator keeps the pressing block 309 pressed down and pulls the connecting line 2 outward to pull the second sleeve 304 and the connecting line 2 out of the first sleeve 302 and the interface 101. After releasing the pressing block 309, the spring 308 automatically resets, completing the disassembly.

[0019] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A wiring anti-disconnection structure for a digital voltmeter, comprising a digital voltmeter body (1) and a connecting wire (2), wherein one end of the connecting wire (2) is provided with a connector (201), and the front of the digital voltmeter body (1) is provided with an interface (101), the connector (201) being fitted and installed inside the interface (101), characterized in that: The outer side of the interface (101) is fitted with an anti-detachment structure (3).

2. The wiring anti-disconnection structure of a digital voltmeter according to claim 1, characterized in that: The anti-detachment structure (3) includes a connecting plate (301), and a first sleeve (302) is provided on the outer side of the connecting plate (301). Multiple mounting holes are provided on the outer side of the first sleeve (302), and each mounting hole is provided with a rolling ball (303).

3. The wiring anti-disconnection structure of a digital voltmeter according to claim 2, characterized in that: The outer side of the connecting line (2) is fitted with a second sleeve (304), and the outer side of the second sleeve (304) is provided with an annular groove (305). One end of the ball (303) abuts against the inner wall of the annular groove (305).

4. The wiring anti-disconnection structure of a digital voltmeter according to claim 3, characterized in that: The second sleeve (304) is fitted inside the first sleeve (302), and a movable sleeve (306) is slidably connected to the outer side of the first sleeve (302). The inner wall of the movable sleeve (306) abuts against the other end of the ball (303).

5. The wiring anti-disconnection structure of a digital voltmeter according to claim 4, characterized in that: The connecting plate (301) is fixedly installed on the front of the digital voltmeter body (1) by bolts. The connecting plate (301) has an opening in the middle, and the interface (101) is located inside the opening.

6. The wiring anti-disconnection structure of a digital voltmeter according to claim 5, characterized in that: The second sleeve (304) has a ring (307) at one end, and a spring (308) is fixedly installed at one end of the ring (307). The other end of the spring (308) is fixedly installed on the outside of the connecting plate (301), and the spring (308) is sleeved on the outside of the movable sleeve (306).

7. The wiring anti-disconnection structure of a digital voltmeter according to claim 6, characterized in that: The ring (307) has a pressing block (309) at one end away from the spring (308), and the two ends of the ring groove (305) are provided with inclined surfaces.

8. The wiring anti-disconnection structure of a digital voltmeter according to claim 7, characterized in that: The second sleeve (304) has a threaded hole on its outer side, and a locking bolt (310) is threaded inside the threaded hole. One end of the locking bolt (310) abuts against the outer side of the connecting line (2).

9. The wiring anti-disconnection structure of a digital voltmeter according to claim 8, characterized in that: The outer side of the connecting plate (301) is also provided with a third sleeve (311), the spring (308), the movable sleeve (306) and the first sleeve (302) are all located inside the third sleeve (311), and the ring (307) is slidably connected inside the third sleeve (311).

10. The wiring anti-disconnection structure of a digital voltmeter according to claim 9, characterized in that: The connecting plate (301), the first sleeve (302) and the third sleeve (311) are integrally formed structures.

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