Meter pen extending device of megohmmeter

Abstract

A megohmmeter pen extending device disclosed by the present invention comprises a clamping part, an extending rod and a holding part, the clamping part comprises a clamping body, the first end of the clamping body is pivotally connected with the first end of the extending rod, the second end of the clamping body is provided with a clamping surface, the second end of the extending rod is connected with the holding part, and the holding part is provided with a clamping surface. The holding part comprises a trigger holding handle and an insulating holding handle, the insulating holding handle is provided with an insertion hole for a meter pen to be inserted, a first end of a wire is arranged in the insertion hole, a second end of the wire extends to the clamping surface of the clamping body along with the extension rod, the trigger holding handle is pivotally connected with a trigger, and the trigger is connected with the insulating holding handle. One end of the trigger is connected with the clamping body through a pull wire so as to drive the clamping body to rotate towards the second end of the extension rod. The megohmmeter pen extending device provided by the invention has the advantages of guaranteeing the measurement precision and realizing remote operation at the same time.

Description

Technical Field

[0001] This invention relates to the field of megohmmeter technology, and more particularly to a megohmmeter probe extension device. Background Technology

[0002] Megohmmeters are indispensable measuring instruments in the power, communications, and electromechanical fields. Their core function is to detect the insulation resistance of various insulating materials, transformers, motors, cables, and electrical equipment. In power maintenance practice, the short probes require personnel to hold and operate them close to the equipment. However, some equipment is difficult to access due to spatial constraints (such as high-level placement or confined spaces). For example, measuring the cable insulation resistance of a 6kV switchgear requires workers to crawl into narrow cable compartments, which is not only inefficient and time-consuming but also poses extremely high safety risks (such as electric shock and mechanical crushing), easily leading to personal injury and equipment accidents. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention provide a megohmmeter probe extension device, comprising a clamping part, an extension rod, and a gripping part. The clamping part includes a clamping body, a first end of which is pivotally connected to a first end of the extension rod, and a second end of which has a clamping surface. The second end of the extension rod is connected to the gripping part. The gripping part includes a trigger grip and an insulating grip. The insulating grip has a socket for inserting a probe, a first end of which is disposed in the socket, and a second end of which extends along the extension rod to the clamping surface of the clamping body. A trigger is pivotally connected to the trigger grip, and one end of the trigger is connected to the clamping body via a pull wire to drive the clamping body to rotate toward the second end of the extension rod. The present invention has the advantages and technical effects of ensuring measurement accuracy while operating remotely.

[0005] In some embodiments, the clamping body is C-shaped, with its first and second ends coplanar, and the extension rod is L-shaped, with its first end being a short section. The clamping body and the short section of the extension rod close together to form a clamping space.

[0006] In some embodiments, a guide ring is provided on the clamping body, and the pull wire is connected to the guide ring and wound around the guide ring.

[0007] In some embodiments, a torsion spring is provided at the connection between the clamping body and the extension rod, with the two ends of the torsion spring connected to the clamping body and the extension rod respectively, and the torsion spring driving the clamping body to rotate toward the first end of the extension rod.

[0008] In some embodiments, a conductive silicone pad is attached to the clamping surface, and the conductive silicone surface is provided with anti-slip texture.

[0009] In some embodiments, an elastic clip is provided in the socket, the clip is distributed circumferentially along the socket and abuts against the probe, and the elastic clip is electrically connected to the wire.

[0010] In some embodiments, an electroscope is also included, the electroscope being disposed at a first end of the extension rod, the sensing electrode of the electroscope extending in a direction away from the extension rod.

[0011] In some embodiments, the extension rod is a hollow insulated rod, with at least a portion of the trigger, the wire, and the pull wire located inside the extension rod.

[0012] In some embodiments, an insulating sleeve is further included, which is sleeved on the second end of the clamping body and is used to cover the clamping surface.

[0013] In some embodiments, the device further includes magnetic sheets, which are respectively arranged on the inner wall of the insulating sleeve and the outer wall of the second end of the clamping body. The two magnetic sheets are magnetically attracted to each other, and the insulating sleeve blocks the clamping surface when the two magnetic sheets are magnetically attracted.

[0014] This application offers the following advantages: it enables remote operation while ensuring measurement accuracy, thereby significantly reducing operational risks and improving the safety and convenience of measurement insulation. The extension rod insulation, grip insulation, and wire insulation form triple insulation protection, completely isolating live parts from operators and eliminating the risk of electric shock when measuring high voltage or live parts with traditional test leads.

[0015] Trigger-driven and clamping mechanisms enable precise clamping over long distances and single-handed operation, solving the problems of difficulty in securing and slippage of traditional test leads during measurement. A large contact area clamping surface, low-resistance wires, and reliable electrical connections reduce contact resistance and signal attenuation, improving the accuracy and stability of measurement data. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the megohmmeter probe extension device according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the clamping space of the megohmmeter probe extension device in an embodiment of the present invention, in the open state.

[0018] Reference numerals: 1. Clamping body; 2. Extension rod; 3. Trigger grip; 31. Trigger; 4. Insulating grip; 41. Socket; 5. Wire; 6. Pull wire; 7. Guide ring; 8. Voltage detector; 9. Insulating sleeve. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] An embodiment of the present invention provides a megohmmeter probe extension device, comprising a clamping part, an extension rod 2, and a gripping part. The clamping part includes a clamping body 1, the first end of which is pivotally connected to the first end of the extension rod 2. The second end of the clamping body 1 has a clamping surface. The second end of the extension rod 2 is connected to the gripping part, which includes a trigger grip 3 and an insulated grip 4. The insulated grip 4 has a socket 41 for inserting the probe. The first end of a wire 5 is disposed in the socket 41, and the second end of the wire 5 extends along the extension rod 2 to the clamping surface of the clamping body 1. A trigger 31 is pivotally connected to the trigger grip 3. One end of the trigger 31 is connected to the clamping body 1 via a pull wire 6 to drive the clamping body 1 to rotate toward the second end of the extension rod 2. The clamping body 1 is rotatably connected to the first end of the extension rod 2 via a structure such as a pivot, hinge, or joint. The rotation angle range of the clamping body 1 is controlled within 0-90°, and the connecting shaft is made of a wear-resistant and insulating material. The clamping body 1, together with the extension rod 2, provides a structural foundation for clamping the workpiece under test, avoiding difficulties in fixing the test point during measurement. The clamping action can be remotely controlled via the grip through the trigger 31 and the pull wire 6, adapting to high-voltage equipment, confined spaces, or long-distance measurement scenarios, improving operational safety. The clamping surface is an arc or plane that contacts the workpiece under test. The clamping surface is electrically connected to the wire 5, ensuring continuous conductivity during clamping and facilitating measurement. The increased contact area of ​​the clamping surface reduces contact resistance. The test leads indirectly contact the workpiece under test through the wire 5 and the clamping surface, preventing measurement errors caused by test lead slippage or poor contact. The extension rod 2 is a rigid insulated rod; the insulation material prevents electric shock to the operator during measurement. The length of the extension rod 2 allows for use at long distances, at heights, or in confined spaces. The grip is made of insulated material, isolating live parts from the operator and improving safety. The trigger grip 3 controls clamping, while the insulated grip 4 provides stable holding; the clear operating logic facilitates operation. An insulated grip 4 has a socket 41 for easy fixing of the test leads. The test leads are connected to the wires 5 within the socket 41. The trigger 31 is mounted on the trigger grip 3 via a pivot. One end of the trigger 31 extends to a position accessible to the fingers, and the other end is fixedly connected to the pull wire 6. The transmission chain is: pulling the trigger 31—pulling the pull wire 6—rotating and opening the clamping body 1. This ensures that gripping the trigger 31 causes the clamping body 1 to rotate and open, disconnecting the measurement; releasing the trigger 31 allows the clamping body 1 to return to its clamping position for measurement. This design facilitates one-handed operation and, in the event of an electric shock, allows the user to easily disconnect from the power source by gripping the trigger 31, thus reducing the risk of electric shock. It also ensures operational safety and measurement accuracy under high-voltage conditions.

[0021] In some embodiments, the clamping body 1 is C-shaped, with the first and second ends of the clamping body 1 being coplanar, and the extension rod 2 is L-shaped, with the first end of the extension rod 2 being a short segment. The clamping body 1 and the short segment of the extension rod 2 close together to form a clamping space.

[0022] Specifically, the first and second ends of the clamping body 1 are on the same horizontal plane. The first end of the clamping body 1 is rotatably connected to the extension rod 2. As the clamping body 1 rotates until the second end of the clamping body 1 contacts the extension rod 2, the clamping limit is completed, forming an encircling clamping effect on the object to be measured, ensuring balanced clamping force and avoiding clamping deviation. The short section of the extension rod 2 cooperates with the clamping body 1 to form a clamping space, improving clamping stability. When the clamping body 1 is not pulled, the second end of the clamping body 1 fits against the short section of the extension rod 2 to form an adjustable clamping space. After pulling the trigger 31, the pull cable 6 pulls the clamping body 1 to rotate, the clamping space opens, and after the object to be measured enters, the trigger 31 is released, the clamping body 1 returns to its original position, and together with the short section of the extension rod 2, clamps the object to be measured.

[0023] In some embodiments, a guide ring 7 is provided on the clamping body 1, and a pull wire 6 is connected to the guide ring 7 and wound around the guide ring 7.

[0024] Specifically, the guide ring 7 is fixed to the clamping body 1 by welding or bolts. The axial direction of the guide ring 7 intersects the rotation axis of the clamping body 1. The pull wire 6 is wound around the guide ring 7, and the pull wire 6 drives the guide ring 7 to rotate towards the extension rod 2. The guide ring 7 is subjected to force on one hand, and on the other hand, it winds the excess pull wire 6 around itself, making it easy to loosen the pull wire 6 when the length needs to be adjusted. The guide ring 7 provides a fixed force support point for the pull wire 6, and clarifies the pulling direction of the pull wire 6 to ensure that the pulling force of the trigger 31 is efficiently transmitted to the clamping body 1. There can be multiple guide rings 7, which change the force direction of the pull wire 6, playing a role similar to that of a pulley. The guide ring 7 isolates the pull wire 6 from direct contact with the clamping body 1, preventing the pull wire 6 from directly rubbing against the side wall of the clamping body 1 during the pulling process, which would cause wear to the clamping body 1 or damage to the pull wire 6.

[0025] In some embodiments, a torsion spring is provided at the connection between the clamping body 1 and the extension rod 2. The two ends of the torsion spring are connected to the clamping body 1 and the extension rod 2 respectively. The torsion spring drives the clamping body 1 to rotate towards the first end of the extension rod 2.

[0026] Specifically, the central axis of the torsion spring is coaxial with the connecting axis of the clamping body 1 and the extension rod 2, ensuring that the direction of the torsion spring's elastic force is consistent with the rotation trajectory of the clamping body 1. The two ends of the torsion spring respectively enter the first end of the clamping body 1 and the short section of the extension rod 2, forming a structure with both ends fixed. Initially, the torsion spring is in a torsional state; the two ends of the torsion spring move towards each other, forcing the clamping body 1 to rotate towards the short section, keeping the clamping surface of the clamping body 1 closed or at a small gap with the mating surface of the short section of the extension rod 2.

[0027] When trigger 31 is pulled, the pull wire 6 generates a pulling force on the clamping body 1 towards the second end (i.e., the gripping part) of the extension rod 2. This pulling force overcomes the elastic force of the torsion spring, causing the clamping body 1 to rotate around its axis, thus opening the clamping space. After trigger 31 is released, the pulling force of the pull wire 6 disappears, and the elastic force of the torsion spring drives the clamping body 1 to return to its original position, engaging with the short section of the extension rod 2 to clamp the workpiece to be measured, achieving clamping upon release. The automatic return of the torsion spring reduces operational intensity and improves measurement efficiency.

[0028] In some embodiments, a conductive silicone pad is attached to the clamping surface, and the conductive silicone pad is provided with anti-slip texture.

[0029] Specifically, the conductive silicone pad is electrically connected to the wire 5 inside the clamping body 1, forming a conductive path from the probe to the wire 5 to the conductive silicone pad to the device under test (DUT), ensuring attenuated transmission of the measurement signal. The conductive silicone pad has good conductivity and elasticity, and can undergo slight deformation under pressure, allowing it to tightly adhere to the surface of the DUT, increasing the actual conductive contact area and reducing contact resistance. The conductive silicone surface is textured with anti-slip patterns to prevent the DUT from slipping off, increasing the static friction between the conductive silicone pad and the DUT. The silicone substrate is soft and has good cushioning properties, preventing scratches and indentations on the DUT surface caused by direct contact with the metal clamping surfaces.

[0030] In some embodiments, an elastic clip is provided in the socket 41. The clip is distributed circumferentially along the socket 41 and abuts against the probe. The elastic clip is electrically connected to the wire 5.

[0031] Specifically, one end of the elastic clip is located inside the socket 41, while the other end is a free end that tilts towards the center of the socket 41. When the test lead is inserted into the socket 41, the test lead housing presses against the free end of the elastic clip, causing the elastic clip to deform elastically and fit against the test lead. The elastic restoring force tightly hugs the metal connector or conductive rod of the test lead, achieving both mechanical clamping and electrical connection through metal-to-metal contact, ensuring lossless transmission of the measurement signal.

[0032] In some embodiments, an electroscope 8 is also included, which is disposed at the first end of the extension rod 2, and the sensing electrode of the electroscope 8 extends in a direction away from the extension rod 2.

[0033] Specifically, the voltage detector 8 is fixed to the first end of the extension rod 2 via a threaded connection or a snap-fit. A gap is maintained between the voltage detector 8 and the clamping body 1 to prevent interference between the clamping action and the voltage detector 8. The voltage detector 8 includes a sensing electrode, a buzzer, and an indicator light. It determines whether the device under test is energized by sensing changes in the electric field around the device under test (DUT). The sensing electrode extends away from the extension rod 2 and faces the DUT synchronously with the clamping part. When the operator drives the clamping body 1 closer to the DUT, the sensing electrode will preferentially contact or approach the test area, completing the energization detection in advance. After energization, when testing insulation, there is a risk of testing the wrong device because the line of sight has left the equipment. Integrating the voltage detector 8 with the megohmmeter probe extension device ensures the continuity of testing and avoids safety hazards from the source.

[0034] In some embodiments, the extension rod 2 is a hollow insulated rod, with at least a portion of the trigger 31, the wire 5, and the pull wire 6 located inside the extension rod 2.

[0035] Specifically, the hollow insulating rod can be an epoxy resin rod. The hollow interior provides a channel for the conductor 5 and the guy wire 6, protecting the guy wire 6 from external influences and completely isolating the conductive conductor 5 and metal guy wire 6 from the outside environment. This avoids the risk of leakage caused by damage to the conductor 5 or corrosion of the guy wire 6 in traditional exposed structures. The built-in trigger 31 reduces the impact of external shocks and vibrations, ensuring stable transmission. The absence of exposed wiring and the guy wire 6 prevents snagging on obstacles during operation, reducing the risk of parts accidentally falling off during high-altitude work. The hollow rod body reduces weight while maintaining minimal structural strength, facilitating adjustment of the center of gravity towards the gripping end and reducing fatigue during prolonged operation.

[0036] In some embodiments, an insulating sleeve is also included, which is sleeved on the second end of the clamping body 1 and is used to cover the clamping surface.

[0037] Specifically, the insulating sleeve is a hollow cylindrical shape. When in its initial position, the insulating sleeve completely seals the clamping surface of the clamping body 1. The insulating sleeve can slide relative to the clamping body 1. When the trigger 31 is pulled to open the clamping body 1, the sleeve remains in its original position under the assistance of gravity or external force. After the workpiece to be tested is placed into the clamping space, the trigger 31 is released, and the clamping body 1 closes under the action of the torsion spring. The workpiece to be tested contacts the sleeve and generates an axial thrust, pushing the sleeve to slide along the clamping body 1, exposing the conductive silicone pad on the clamping surface, until the conductive silicone pad is in close contact with the workpiece to be tested, completing the measurement. Pulling the trigger 31 to open the clamping body 1, the workpiece to be tested is removed from the clamping surface, and the sleeve slides back to its initial position along the axis of the clamping body 1 under the action of gravity or the return spring, re-covering the clamping surface and restoring the insulating protection state. The insulating sleeve blocks the conductive area under normal conditions. Even if the operator accidentally touches the clamping part when not measuring, the conductive part will not come into contact with it. The sleeve can prevent the conductive silicone pad on the clamping surface from accumulating dust, oil stains, or oxidation and aging due to long-term exposure, thus protecting the conductivity and reducing the frequency of maintenance.

[0038] In some embodiments, the device further includes magnetic sheets, which are respectively arranged on the inner wall of the insulating sleeve and the outer wall of the second end of the clamping body 1. The two magnetic sheets are magnetically attracted to each other, and the insulating sleeve blocks the clamping surface when the two magnetic sheets are magnetically attracted.

[0039] Specifically, the two sets of magnetic sheets are tightly attracted by magnetic force, firmly fixing the insulating sleeve to the second end of the clamping body 1, ensuring that the sleeve completely covers the clamping surface and forms reliable insulation protection. At this time, the magnetic attraction force is greater than the sliding friction force of the sleeve, which can resist the sleeve displacement caused by slight vibration and shaking. Pushing the sleeve can release the magnetic attraction, thereby exposing the clamping surface to make contact with the test piece for conductivity. Pulling the trigger 31 opens the clamping body 1, the test piece is released from the sleeve, and the sleeve slides automatically along the clamping body 1 under the action of gravity and magnetic attraction, the two sets of magnetic sheets are re-attracted and repositioned, and the sleeve returns to its original position to cover the clamping surface, without the need for manual intervention.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A megohmmeter probe extension device, characterized in that, include: The device comprises a clamping part, an extension rod, and a gripping part. The clamping part includes a clamping body, a first end of which is pivotally connected to a first end of the extension rod, and a second end of the clamping body having a clamping surface. The second end of the extension rod is connected to the gripping part. The gripping part includes a trigger grip and an insulated grip. The insulated grip has a socket for inserting a test lead. A first end of a lead is disposed in the socket, and a second end of the lead extends along the extension rod to the clamping surface of the clamping body. A trigger is pivotally connected to the trigger grip, and one end of the trigger is connected to the clamping body via a pull wire to drive the clamping body to rotate toward the second end of the extension rod.

2. The megohmmeter probe extension device according to claim 1, characterized in that, The clamping body is C-shaped, with its first and second ends coplanar. The extension rod is L-shaped, with its first end being a short section. The clamping body and the short section of the extension rod close together to form a clamping space.

3. The megohmmeter probe extension device according to claim 1, characterized in that, The clamping body is provided with a guide ring, and the pull wire is connected to the guide ring and wound around the guide ring.

4. The megohmmeter probe extension device according to claim 1, characterized in that, A torsion spring is provided at the connection between the clamping body and the extension rod. The two ends of the torsion spring are respectively connected to the clamping body and the extension rod. The torsion spring drives the clamping body to rotate towards the first end of the extension rod.

5. The megohmmeter probe extension device according to claim 1, characterized in that, A conductive silicone pad is attached to the clamping surface, and the conductive silicone surface is provided with anti-slip texture.

6. The megohmmeter probe extension device according to claim 1, characterized in that, An elastic clip is provided inside the socket. The clip is distributed circumferentially around the socket and abuts against the probe. The elastic clip is electrically connected to the wire.

7. The megohmmeter probe extension device according to claim 1, characterized in that, It also includes an electroscope, which is disposed at the first end of the extension rod, and the sensing electrode of the electroscope extends away from the extension rod.

8. The megohmmeter probe extension device according to claim 1, characterized in that, The extension rod is a hollow insulated rod, with part of the trigger, the wire, and the pull wire located inside the extension rod.

9. The megohmmeter probe extension device according to claim 1, characterized in that, It also includes an insulating sleeve, which is fitted onto the second end of the clamping body and is used to cover the clamping surface.

10. The megohmmeter probe extension device according to claim 1, characterized in that, It also includes magnetic sheets, which are respectively arranged on the inner wall of the insulating sleeve and the outer wall of the second end of the clamping body. The two magnetic sheets are magnetically attracted to each other, and when the two magnetic sheets are magnetically attracted, the insulating sleeve blocks the clamping surface.

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