A portable clamp-on ammeter

Abstract

This invention provides a portable clamp-on ammeter, comprising a body, a measuring instrument, and a pair of clamp-shaped clamps rotatably mounted on one end of the measuring instrument. A compensating rod is mounted on one end of the measuring instrument, and a mounting sleeve is fitted over the outer wall of the compensating rod. Folding sleeves are rotatably mounted on both working sides of the outer wall of the mounting sleeve. A driving sleeve is rotatably mounted on the bottom end of each pair of folding sleeves. The other ends of the driving sleeves are rotatably mounted on the left and right sides of the bottom end of the compensating rod, respectively. The measuring instrument contains a driving mechanism for rotating the pair of clamp-shaped clamps. This invention, through the combination of the compensating rod, mounting sleeve, folding sleeve, and driving sleeve, enables the clamp-shaped clamps to be height-adjustable. When measuring targets at relatively high locations, such as overhead power lines on utility poles, the operator can adjust this structure to extend the compensating rod when working on higher poles, avoiding difficulties due to distance limitations and reducing operational difficulty and safety risks associated with inconvenience.

Description

Technical Field

[0001] This utility model belongs to the field of electrical measurement medical device technology, and more specifically, it relates to a portable clamp ammeter. Background Technology

[0002] A clamp meter is a portable instrument for measuring current. It operates on the principle of electromagnetic induction. When a current-carrying wire passes through its openable jaws, which are made of a high-permeability iron core, an induced electromotive force (EMF) is generated in the winding connected to the iron core. This EMF is proportional to the magnitude of the current being measured, and the current value is calculated through internal circuitry. It mainly consists of jaws and a meter head; some models also have a range adjustment knob. The jaws may have an insulating coating, and the meter head has a digital display or analog dial to show the measurement results. The range adjustment knob allows selection of the appropriate measurement range.

[0003] In power transmission and distribution systems, a large number of wires and cables are located at relatively high positions, such as overhead lines on utility poles and cables in cable trays high up in factory workshops. Traditional portable clamp-on ammeters have fixed jaw and handle lengths, making it difficult for operators to accurately clamp the jaws onto the conductors when facing these relatively high targets. Due to the height above the ground, operators usually need to use climbing equipment, but the fixed length of the clamp-on ammeter is difficult to maneuver in the limited operating space at heights, increasing the difficulty and risk of operation.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings to provide a portable clamp ammeter, in order to achieve a more practical purpose. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a portable clamp-on ammeter, which is achieved by the following specific technical means:

[0006] A portable clamp ammeter includes a measuring instrument and a pair of clamp-shaped clamps rotatably mounted on one end of the measuring instrument. A compensating rod is mounted on one end of the measuring instrument. An installation sleeve is fitted on the outer wall of the compensating rod. Folding sleeves are rotatably mounted on both working sides of the outer wall of the installation sleeve. A driving sleeve is rotatably mounted on the bottom end of each pair of folding sleeves. The other ends of the pair of driving sleeves are respectively rotatably mounted on the left and right sides of the bottom end of the compensating rod. A driving mechanism for driving the pair of clamp-shaped clamps to rotate is provided inside the measuring instrument.

[0007] Preferably, the drive mechanism includes gears fixedly mounted on the outer wall of the shaft at one end of a pair of clamp-shaped chucks, racks meshing on one side of each pair of gears, the side walls of each pair of racks slidingly connected to the inner wall of the measuring instrument, a connecting strip being mounted at the bottom end of the pair of racks, and a pull rope being mounted on one side of the connecting strip.

[0008] Preferably, each pair of racks has a slider on its sidewall, and the inner wall of the measuring instrument has a groove that matches the slider. Each pair of racks is slidably connected to the inner wall of the measuring instrument through the slider.

[0009] Preferably, a through groove matching the pull rope is opened on one side of the compensation rod, and the other end of the pull rope passes through the through groove and is fixedly fitted with a pull block.

[0010] Preferably, a stop block is installed on the inner wall of the measuring instrument, and a through hole matching the pull rope is opened on one side of the stop block. The pull rope is located in the hole, and a spring is fitted on the outer wall of the pull rope. The spring is abutted between the connecting strip and the stop block.

[0011] Preferably, the surface of the slider is coated with a wear-resistant coating made of ceramic material.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model achieves adjustable clamp head height through a combination structure of compensating rod, mounting sleeve, folding sleeve, and driving sleeve. When facing relatively high measurement targets such as overhead lines on utility poles, operators can adjust this structure to extend the compensating rod when working on higher utility poles, avoiding difficulties in operation due to distance limitations, reducing operational difficulty and safety risks caused by inconvenience. The rotating installation design of the folding sleeve allows it to be folded and stored when not in use, without taking up too much space, making it convenient to carry and store. When the length needs to be adjusted for measurement, it can be unfolded according to actual needs. Combined with the extension and retraction of the compensating rod, it further increases the flexibility of length adjustment and better adapts to measurement scenarios at different heights.

[0014] 2. This utility model utilizes a gear and rack meshing drive mechanism to effectively convert the tension of the pull rope into the opening and closing action of the clamp chuck. When the pull rope is pulled, the rack moves via the connecting strip, and the rack drives the gear to rotate, thus enabling the clamp chuck to open and close quickly and stably. This mechanical transmission method has a relatively simple structure and high reliability. When operating at relatively high altitudes, it is less prone to failure due to complex environments, ensuring the smooth progress of measurement work. The cooperation between the slider and the groove provides a stable guide for the sliding of the rack. The wear-resistant ceramic coating on the slider results in low friction and wear resistance when sliding within the groove, allowing the rack to maintain smooth sliding during long-term use. This ensures the meshing accuracy of the gear and rack, thereby guaranteeing the accuracy and consistency of the clamp chuck's opening and closing action. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the working state of this utility model.

[0017] Figure 3 This is an enlarged schematic diagram of a partial structure of this utility model.

[0018] Figure 4 This is an enlarged schematic diagram of the internal structure of this utility model.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1. Measuring gauge; 2. Compensating rod; 3. Clamping clamp; 4. Mounting sleeve; 5. Folding sleeve; 6. Drive sleeve; 7. Gear; 8. Rack; 9. Connecting bar; 10. Pull rope; 11. Spring; 12. Stop block; 13. Slide groove; 14. Through groove; 15. Pull block. Detailed Implementation

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

[0022] Example:

[0023] As attached Figure 1 To be continued Figure 4 As shown:

[0024] This utility model provides a portable clamp ammeter, including a measuring meter 1 and a pair of clamp-shaped clamps 3 rotatably mounted on one end of the measuring meter 1. A compensating rod 2 is mounted on one end of the measuring meter 1, and an installation sleeve 4 is fitted on the outer wall of the compensating rod 2. Folding sleeves 5 are rotatably mounted on both working sides of the outer wall of the installation sleeve 4. A driving sleeve 6 is rotatably mounted on the bottom end of each pair of folding sleeves 5. The other ends of the pair of driving sleeves 6 are respectively rotatably mounted on the left and right sides of the bottom end of the compensating rod 2. A driving mechanism for driving the pair of clamp-shaped clamps 3 to rotate is provided inside the measuring meter 1.

[0025] The drive mechanism includes gears 7 fixedly mounted on the outer wall of the shaft at one end of a pair of clamp-shaped chucks 3. A rack 8 is meshed on one side of each pair of gears 7. The side walls of each pair of racks 8 are slidably connected to the inner wall of the measuring instrument 1. A connecting strip 9 is installed at the bottom of the pair of racks 8. A pull rope 10 is installed on one side of the connecting strip 9. The meshing of gears 7 and racks 8 can accurately convert the linear tension of the pull rope 10 into the rotational motion of the clamp-shaped chucks 3, thereby achieving precise control of the opening and closing angle of the clamp-shaped chucks 3.

[0026] Each pair of racks 8 has a slider on its sidewall, and the inner wall of the measuring gauge 1 has a groove 13 that matches the slider. The racks 8 are slidably connected to the inner wall of the measuring gauge 1 through the slider. The cooperation between the slider and the groove 13 on the inner wall of the measuring gauge 1 provides a stable guide for the sliding of the racks 8, ensuring that the racks 8 can only move in a straight line when subjected to the tension of the pull rope 10, thereby ensuring the stability and reliability of the meshing between the gear 7 and the racks 8.

[0027] The compensating rod 2 has a through groove 14 on one side that matches the pull rope 10. The other end of the pull rope 10 passes through the through groove 14 and is fixedly fitted with a pull block 15. The pull rope 10 allows the operator to operate from a position away from the clamp chuck 3 and the gear 7 and rack 8 drive mechanism. By pulling the pull block 15, the opening and closing of the clamp chuck 3 can be controlled. This remote operation method is very convenient in some special measurement environments, such as when measuring in narrow spaces or at relatively high positions. The operator can operate from a safer and more comfortable position, avoiding the dangers that may arise from being close to the measurement part.

[0028] The measuring instrument 1 has a stop block 12 installed on its inner wall. One side of the stop block 12 has a through hole that matches the pull rope 10. The pull rope 10 is located inside the hole, and a spring 11 is fitted onto the outer wall of the pull rope 10. The spring 11 is positioned between the connecting bar 9 and the stop block 12, enabling the clamp 3 to automatically reset. When the pull block 15 is released, the spring 11, under its own elastic force, pushes the connecting bar 9 and the rack 8 upwards, returning the clamp 3 to its closed state. This function simplifies the operation process, avoiding the tedious process of manually closing the clamp 3 after each measurement, and also preventing accidents caused by forgetting to close the clamp.

[0029] The surface of the slider is coated with a wear-resistant coating made of ceramic material.

[0030] The working principle of this embodiment: If measurement is required at a relatively high or distant location, such as overhead lines on utility poles or cables in cable trays at a high point in a factory workshop, operate the folding sleeve 5. Hold the end of the folding sleeve 5 near the mounting sleeve 4 and unfold it outwards. At this time, the drive sleeve 6 will rotate as the folding sleeve 5 unfolds, thereby pushing the compensation rod 2 to extend relative to the measuring instrument 1. Adjust the unfolding angle of the folding sleeve 5 according to the actual measurement distance and operating space until the compensation rod 2 reaches a suitable length, so that the clamp 3 can easily approach the conductor being measured. After adjusting the length, check the opening and closing state of the clamp 3. Gently pull the pull block 15. After releasing the pull block 15, the clamp 3 should be able to quickly return to the closed state under the action of the spring 11. Hold the measuring instrument 1 and slowly bring the clamp 3 of the adjusted length close to the conductor being measured. During the approach process, keep the measuring instrument 1 stable and avoid... To prevent the clamp-shaped clamp 3 from colliding with the wire or failing to accurately clamp the wire due to shaking, pull the lever 15 again after the clamp-shaped clamp 3 approaches the wire, so that the clamp-shaped clamp 3 opens wide enough to accommodate the wire to be tested. Then place the wire in the center of the jaws of the clamp-shaped clamp 3, and slowly release the lever 15. Under the action of the spring 11, the clamp-shaped clamp 3 will gradually close and tightly clamp the wire to be tested. After the clamp-shaped clamp 3 clamps the wire, the measuring instrument 1 will detect the current through the principle of electromagnetic induction and display the measurement result on the display screen. Read the current value displayed on the display screen and record it. After the measurement is completed, pull the lever 15 again to open the clamp-shaped clamp 3 and remove it from the wire to be tested. If you need to continue measuring other wires, you can repeat the above measurement process. When the measurement work is finished, fold the folding sleeve 5 to restore the compensation rod 2 to its initial storage state for easy carrying and storage.

[0031] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A portable clamp meter, comprising a measuring instrument (1) and a pair of clamp clamps (3) rotatably mounted on one end of the measuring instrument (1), characterized in that: The measuring instrument (1) is equipped with a compensating rod (2) at one end. The outer wall of the compensating rod (2) is fitted with an installation sleeve (4). Folding sleeves (5) are rotatably installed on both working sides of the outer wall of the installation sleeve (4). A driving sleeve (6) is rotatably installed at the bottom end of each pair of folding sleeves (5). The other ends of the pair of driving sleeves (6) are rotatably installed on the left and right sides of the bottom end of the compensating rod (2). The measuring instrument (1) is equipped with a driving mechanism for driving a pair of clamp-shaped chucks (3) to rotate.

2. The portable clamp-on ammeter according to claim 1, characterized in that: The drive mechanism includes gears (7) fixedly mounted on the outer wall of the shaft at one end of a pair of clamp-shaped chucks (3). A rack (8) is meshed on one side of each pair of gears (7). The side walls of each pair of racks (8) are slidably connected to the inner wall of the measuring instrument (1). A connecting strip (9) is installed at the bottom end of each pair of racks (8). A pull rope (10) is installed on one side of the connecting strip (9).

3. The portable clamp-on ammeter according to claim 2, characterized in that: Each pair of racks (8) has a slider on its sidewall, and each measuring instrument (1) has a groove (13) on its inner wall that matches the slider. Each pair of racks (8) is slidably connected to the inner wall of the measuring instrument (1) through the slider.

4. The portable clamp-on ammeter according to claim 3, characterized in that: The compensating rod (2) has a through groove (14) on one side that matches the pull rope (10), and the other end of the pull rope (10) passes through the through groove (14) and is fixedly fitted with a pull block (15).

5. The portable clamp-on ammeter according to claim 4, characterized in that: The measuring instrument (1) has a stop block (12) installed on its inner wall. A through hole matching the pull rope (10) is opened on one side of the stop block (12). The pull rope (10) is located in the hole. A spring (11) is fitted on the outer wall of the pull rope (10). The spring (11) is abutted between the connecting strip (9) and the stop block (12).

6. The portable clamp-on ammeter according to claim 3, characterized in that: The surface of the slider is coated with a wear-resistant coating, which is made of ceramic material.

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