Transformer test clamp
By designing transformer test pliers with locking and distance adjustment components, the problem of test pliers in the prior art cannot stably clamp the conductive pole, achieving stable clamping and high-precision measurement during the test process, and passing through insulating materials Prevent insulation failure.
Patent Information
- Application Number
- CN201710764847.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2017-08-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2037-08-30
AI Technical Summary
In the prior art, the transformer test pliers cannot stably clamp the conductive rod, causing shaking during the test and affecting the measurement accuracy.
A test pliers including a first jaw nose, a crossbar, a hand handle, a locking assembly and a distance adjustment assembly are designed. The jaws can be stabilized by initially locking the locking assembly and the distance adjustment assembly. Hold the conductive pole tightly to prevent shaking.
The stable clamping of the test pliers is achieved, avoiding shaking, improving measurement accuracy, and preventing damage to the insulating layer from affecting measurement by combining the insulating material and metal.
Smart Images
Figure CN107462749B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of power auxiliary tools, in particular to a transformer testing clamp. Background Art
[0002] With the continuous growth of power supply load, higher and higher requirements are placed on the load capacity of transformers. While the output capacity of transformers is improved, the diameter of transformer conductive rods becomes larger and larger. In order to ensure the safe and stable operation of transformers, maintenance personnel need to regularly carry out multiple pressure tester tests. When testing the insulation resistance of transformer windings or the DC resistance of windings, a test clamp is involved. The caliber of the test clamp is adjustable. During the test, the jaws of the test clamp need to be clamped on the conductive rod of the transformer to keep it stable. The test clamp can be removed after the test is completed. In the prior art, the test clamp cannot stably clamp the conductive rod of the transformer. During the test, the test clamp will shake, affecting the measurement accuracy. Summary of the invention
[0003] The purpose of the present invention is to provide a transformer test clamp, aiming to solve the problem that the test clamp in the prior art cannot stably clamp the transformer conductive rod, and the test clamp will shake during the test, thereby affecting the measurement accuracy.
[0004] The technical problem to be solved is to provide a transformer test clamp in view of the deficiencies of the above-mentioned prior art. The device can stably clamp the transformer conductive rod to ensure measurement accuracy.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a transformer testing pliers, including a first pliers mouth, a cross bar fixedly connected to the first pliers mouth, a hand handle slidably mounted on the outside of the cross bar, a second pliers mouth fixedly connected to the hand handle and cooperating with the first pliers mouth to clamp the transformer conductive rod, a locking assembly arranged between the cross bar and the hand handle for locking the cross bar and the hand handle, and a distance adjustment assembly arranged between the cross bar and the hand handle for adjusting the distance between the first pliers mouth and the second pliers mouth.
[0006] Furthermore, the locking assembly includes a locking rod hinged on the hand handle and mounted on the horizontal surface for abutting and compressing the cross bar, and a locking spring for connecting the locking rod and the hand handle. The hinged ends of the locking spring and the locking rod are respectively arranged on the upper and lower sides of the cross bar. One end of the locking spring abuts against the locking rod and the other end of the locking spring abuts against the hand handle. The locking spring is in a compressed state and the locking rod locks the cross bar.
[0007] Furthermore, the hinged end of the locking rod is provided with a through hole which is cross-slidably connected to the cross bar, and the locking rod is pressed against the cross bar.
[0008] Further, the locking springs are respectively arranged on the upper side and the lower side of the cross bar.
[0009] Furthermore, the distance adjustment assembly includes a fastening rod hinged on the hand-held handle and used for squeezing and driving the crossbar to move, and a return spring arranged between the fastening rod and the hand-held handle and used for connecting the fastening rod and the hand-held handle.
[0010] Furthermore, the distance adjustment component also includes an adjustment plate that contacts the fastening rod, and the adjustment plate is provided with a through hole for the cross bar to pass through, one end of the return spring contacts the adjustment plate, and the other end of the return spring contacts the handle.
[0011] The beneficial effect produced by adopting the above technical scheme is that compared with the prior art, when it is necessary to use the transformer test clamp device of the present invention for measurement, the distance between the first jaw and the second jaw can be preliminarily adjusted through the locking component so that the first jaw and the second jaw can hold the transformer conductive rod, and the cross bar and the hand-held rod can be preliminarily locked, and then the distance adjustment component can be used to further reduce the distance between the first jaw and the second jaw, so that the jaws of the transformer test clamp of the device of the present invention can hold the transformer conductive rod tightly. During the test, the cross bar and the hand-held rod are locked, the test clamp will not shake, and the measurement accuracy is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a schematic structural diagram of a transformer test clamp provided by an embodiment of the present invention;
[0013] Figure 2 yes Figure 1 The cross-sectional structure diagram of the transformer test clamp is shown.
[0014] In the figure: 1, first jaw; 2, second jaw; 3, cross bar; 4, hand handle; 5, locking rod; 51, through hole; 6, locking spring; 7, tightening rod; 8, reset spring; 9, adjustment plate. DETAILED DESCRIPTION
[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0016] like Figure 1 and Figure 2 As shown, an embodiment of a transformer test pliers of the present invention is shown, the test pliers comprises a first jaw 1, a cross bar 3 fixedly connected to the first jaw 1, a hand handle 4 slidably mounted on the outer side of the cross bar 3, a second jaw 2 fixedly connected to the hand handle 4 and cooperating with the first jaw 1 to clamp the transformer conductive rod, a locking assembly arranged between the cross bar 3 and the hand handle 4 for locking the cross bar 3 and the hand handle 4, and a distance adjustment assembly arranged between the cross bar 3 and the hand handle 4 for adjusting the distance between the first jaw 1 and the second jaw 2.
[0017] The locking action of the test clamp device is divided into two steps. First, when the first jaw 1 and the second jaw 2 of the test clamp hold the transformer conductive rod, preliminary locking is performed through the locking component. At this time, the test clamp cannot completely hold the transformer conductive rod. Then, by adjusting the distance adjustment component, the distance between the first jaw 1 and the second jaw 2 is further reduced, so that the test clamp holds the transformer conductive rod. The distance adjustment component serves as a fine-tuning component, which helps the test clamp to stably hold the transformer conductive rod, avoids the test clamp from shaking during the test, and ensures the measurement accuracy. Compared with the prior art in which the first jaw 1 and the second jaw 2 are made of metal as a whole, in the present application, the side walls of the first jaw 1 and the second jaw 2 that contact the transformer conductive rod are made of metal and are respectively connected to the voltage and current lines. The other parts of the jaws of the first jaw 1 and the second jaw 2 are made of insulating materials, such as insulating resin, rubber, etc., to prevent the insulation layer from being damaged, resulting in a parallel path with the conductive rod during the test, affecting the measurement accuracy.
[0018] The locking assembly includes a locking rod 5 hinged on the hand handle 4 and sleeved on the cross bar 3 for abutting and pressing the cross bar 3, and a locking spring 6 for connecting the locking rod 5 and the hand handle 4. The hinged ends of the locking spring 6 and the locking rod 5 are respectively arranged on the upper and lower sides of the cross bar 3. One end of the locking spring 6 abuts on the locking rod 5, and the other end of the locking spring 6 abuts on the hand handle 4. The locking spring 6 is in a compressed state, and the locking rod 5 locks the cross bar 3. The locking spring 6 is in a compressed state, and the locking rod 5 is pressed against the cross bar 3 and maintained in a compressed state. When the size of the test pliers jaws needs to be adjusted, that is, the distance between the first jaw 1 and the second jaw 2, the locking rod 5 is rotated to release the compression state between the locking rod 5 and the cross bar 3, and the hand handle 4 is slid on the cross bar 3, so that the size of the test pliers jaws can be increased or decreased. After adjustment, the locking rod 5 is lowered to lock the hand handle 4 and the cross bar 3, thereby locking the distance between the first jaw 1 and the second jaw 2.
[0019] like Figure 2 As shown, the hinged end of the locking rod 5 is provided with a through hole 51 which is cross-slidably connected with the cross bar 3, and the locking rod 5 is pressed against the cross bar 3. The locking rod 5 can be provided with a locking protrusion adapted to the cross bar 3, and the locking is implemented by the extrusion of the arc-shaped working surface of the locking protrusion and the cross bar 3. The locking rod 5 can also be provided with a through hole 51 for locking, and the cross bar 3 passes through the through hole 51. The locking rod 5 is tilted and pressed against the cross bar 3 by the locking spring 6, so that the distance between the fixed jaw 1 and the movable jaw 2 is fixed.
[0020] The locking springs 6 are respectively arranged on the upper and lower sides of the cross bar 3. Two locking springs 6 are arranged, and the hinge shafts with the locking rod 5 are arranged on both sides of the cross bar 3. The two locking springs 6 are symmetrically arranged on the front and rear sides of the cross bar 3; the locking springs 6 can also be respectively arranged on the upper and lower sides of the cross bar 3, and the locking springs 6 on the upper and lower sides respectively squeeze the locking rod 5, so that the locking rod 5 is tilted and pressed against the cross bar 3; the locking springs 6 are all in a compressed state.
[0021] The distance adjustment assembly includes a fastening rod 7 hinged on the hand-held handle 4 and used for squeezing and driving the cross bar 3 to move, and a return spring 8 arranged between the fastening rod 7 and the hand-held handle 4 and used for connecting the fastening rod 7 and the hand-held handle 4 . The distance adjustment component is used to further reduce the jaw spacing after the locking component initially fixes the jaw spacing of the test clamp, so that the test clamp can hold the transformer conductive rod and remain stable; the distance adjustment component can be an operating rod fixed separately on the cross bar 3. After the locking component locks the cross bar 3 and the hand-held handle 4, the operating rod is fine-tuned to make the cross bar 3 and the hand-held handle 4 move relative to each other, and the first jaw 1 moves toward the second jaw 2 to reduce the jaw spacing, so that the test clamp holding the transformer conductive rod can be turned into a clamping state, ensuring that the test clamp can stably hold the conductive rod and prevent shaking; the distance adjustment component can also be realized by a hinged fastening rod 7 in this embodiment, and a one-way locking buckle is provided on the fastening rod 7. When the fastening rod 7 drives the cross bar 3 to move, the distance between the first jaw 1 and the second jaw 2 is reduced, and the fastening rod 7 is loosened. At the same time, the cross bar 3 is still fixed by the locking assembly to ensure that the test clamp can be in a state of holding the conductive rod.
[0022] The distance adjustment assembly also includes an adjustment sheet 9 that contacts the fastening rod 7. The adjustment sheet 9 is provided with a through hole for the cross bar 3 to cross. One end of the reset spring 8 contacts the adjustment sheet 9, and the other end of the reset spring 8 contacts the hand handle 4. The fastening rod 7 can also adjust the cross bar 3 in one direction by adding an adjustment sheet 9. The cross bar 3 is suspended in the through hole of the adjustment sheet 9. The adjustment sheet 9 is perpendicular to the cross bar 3. The fastening rod 7 rotates, driving the adjustment sheet 9 to tilt toward one end of the spring and press the cross bar 3 to move and fine-tune, so that the test clamp can clamp the conductive rod.
[0023] Beneficial effects: The transformer test clamp of the present invention adjusts the jaw spacing of the test clamp by rotating the tilted locking rod. After loosening the locking rod, the locking rod is tilted and pressed against the cross bar for preliminary locking. Then, the jaw spacing of the test clamp is fine-tuned by the tightening rod, so that the test clamp can clamp the transformer conductive rod. The two-step locking and fixing action can enable the jaws of the transformer test clamp of the present invention to stably hold the transformer conductive rod. During the test, the test clamp will not shake, thereby ensuring the measurement accuracy. The jaws of the transformer test clamp of the present invention adopt a combination of insulating material and metal to prevent insulation failure at the jaw connection point, which affects the measurement accuracy.
[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A transformer test clamp, used for clamping a transformer conductive rod, characterized in that: The invention comprises a first jaw (1), a cross bar (3) fixedly connected to the first jaw (1), a hand grip (4) slidably mounted on the outer side of the cross bar (3), a second jaw (2) fixedly connected to the hand grip (4) and cooperating with the first jaw (1) to clamp a transformer conductive rod, a locking assembly arranged between the cross bar (3) and the hand grip (4) for locking the cross bar (3) and the hand grip (4), and a distance adjustment assembly arranged between the cross bar (3) and the hand grip (4) for adjusting the distance between the first jaw (1) and the second jaw (2); The locking assembly comprises a locking rod (5) hinged on the hand-held handle (4) and sleeved on the cross bar (3) for abutting and pressing the cross bar (3), and a locking spring (6) for connecting the locking rod (5) and the hand-held handle (4); the hinged ends of the locking spring (6) and the locking rod (5) are respectively arranged on the upper and lower sides of the cross bar (3); one end of the locking spring (6) abuts against the locking rod (5) and the other end of the locking spring (6) abuts against the hand-held handle (4); the locking spring (6) is in a compressed state, and the locking rod (5) locks the cross bar (3); The hinged end of the locking rod (5) is provided with a through hole (51) which is cross-slidably connected to the cross rod (3), and the locking rod (5) is pressed against the cross rod (3); The locking springs (6) are respectively arranged on the upper side and the lower side of the cross bar (3).
2. The transformer test clamp according to claim 1, characterized in that: The distance adjustment assembly comprises a fastening rod (7) hinged on the hand-held handle (4) and used for squeezing and driving the crossbar (3) to move, and a return spring (8) arranged between the fastening rod (7) and the hand-held handle (4) and used for connecting the fastening rod (7) and the hand-held handle (4).
3. The transformer test clamp according to claim 2, characterized in that: The distance adjustment assembly further comprises an adjustment plate (9) abutting against the fastening rod (7), the adjustment plate (9) being provided with a through hole for the cross bar (3) to pass through, one end of the return spring (8) abutting against the adjustment plate (9), and the other end of the return spring (8) abutting against the hand-held handle (4).