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CN-224232438-U - Three-phase current transformer for spiral fastening type mine motor

CN224232438UCN 224232438 UCN224232438 UCN 224232438UCN-224232438-U

Abstract

The utility model provides a three-phase current transformer for a spiral fastening type mine motor, which relates to the technical field of current transformers and comprises a semicircular upper half body and a semicircular lower half body, wherein one end of the upper half body is hinged with one end of the lower half body through a hinge, the other end of the upper half body is a free end and is opened and closed and locked through a spiral fastening assembly, and three independent iron core accommodating grooves are correspondingly formed in the upper half body and the lower half body and used for accommodating three-phase current measuring iron cores. The device is convenient to unlock, after measurement is completed, the unlocking ring can be driven to be embedded into the circular cap annular groove only by rotating the spiral knob clockwise, the circular cap is ejected out of the limiting body locking groove, quick unlocking is realized, and the operation is simple, convenient and efficient.

Inventors

  • SUN DIANXING
  • WANG GAOWU
  • ZHANG RONGFU
  • JIANG SHUAI
  • LI MING
  • JIANG YONGFENG
  • Sun Ruihang
  • JU WENJIE

Assignees

  • 本溪钢铁（集团）矿业有限责任公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. A three-phase current transformer for a screw-fastened mine motor, comprising: An upper half body (2) and a lower half body (4) which are semicircular; One end of the upper half body (2) is hinged with one end of the lower half body (4) through a hinge, and the other end of the upper half body (2) is a free end and is opened and closed and locked through a screw fastening assembly; The screw fastening assembly comprises a round cap (1), an unlocking ring (3), a screw structure (5), a screw knob (6) and a limiting body (7), wherein the screw structure (5) is fixedly arranged on the outer side wall of the free end of the upper half body (2), the round cap (1) is fixedly connected to the top end of the screw structure (5), threads of the screw knob (6) are sleeved at the bottom end of the screw structure (5), and the unlocking ring (3) is movably sleeved at the outer side of the screw structure (5) and is positioned between the round cap (1) and the upper half body (2); The limiting body (7) is vertically fixed on the outer side wall of the free end of the lower half body (4), a guide hole used for the spiral structure (5) to penetrate through is formed in the middle of the limiting body (7), and a locking groove matched with the round cap (1) is formed below the guide hole.
  2. 2. The three-phase current transformer for spiral-link type mine motor of claim 1, wherein the overall diameter of the transformer is 15cm or less and the height is 8cm or less.
  3. 3. The three-phase current transformer for a screw-fastened mine motor according to claim 1, wherein the screw structure (5) is a trapezoidal thread, and the thread angle of the trapezoidal thread is 30 °.
  4. 4. The three-phase current transformer for the spiral fastening type mine motor, which is characterized in that the inner diameter of the unlocking ring (3) is 0.5-1mm larger than the outer diameter of the spiral structure (5), the outer diameter of the unlocking ring (3) is matched with the inner diameter of the guide hole of the limiting body (7), and an annular boss matched with the top end of the spiral knob (6) is arranged at the bottom of the unlocking ring (3).
  5. 5. The three-phase current transformer for the spiral fastening type mine motor, which is disclosed in claim 1, is characterized in that an annular groove is formed in the bottom of the circular cap (1), and the inner diameter of the annular groove is matched with the outer diameter of the unlocking ring (3).
  6. 6. The three-phase current transformer for the spiral fastening type mine motor, which is disclosed in claim 1, is characterized in that an arc-shaped handle is arranged on the outer side wall of the upper half body (2), and anti-skid lines are arranged on the surface of the arc-shaped handle.
  7. 7. The three-phase current transformer for the spiral-link type mine motor of claim 1, wherein an insulating bushing is arranged on the inner wall of the iron core accommodating groove, an iron core is placed in the iron core accommodating groove, and an insulating paint layer is wrapped on the surface of the iron core.
  8. 8. The three-phase current transformer for the spiral fastening type mine motor, which is disclosed in claim 1, is characterized in that anti-slip raised strips which are uniformly distributed are arranged on the outer side wall of the spiral knob (6), the height of each raised strip is 1-1.5mm, a rubber gasket is arranged between the top end of the spiral knob (6) and the outer side wall of the upper half body (2), and the rubber gasket is sleeved on the outer side of the spiral structure (5).
  9. 9. The three-phase current transformer for the spiral fastening type mine motor, as claimed in claim 1, is characterized in that the inner wall of the guide hole of the limiting body (7) is provided with a wear-resistant bushing.
  10. 10. A three-phase current transformer for a screw-fastened mine motor as set forth in claim 1, wherein the depth of said locking groove is the height of a round cap (1) 。

Description

Three-phase current transformer for spiral fastening type mine motor Technical Field The utility model relates to the technical field of current transformers, in particular to a three-phase current transformer for a spiral fastening type mine motor. Background In mine production, a large motor is a core power device, and stable monitoring of three-phase current is critical to safe operation of the device. The current transformer is used as a key component for current measurement, and needs to adapt to complex environments of mine sites for a long time, namely, space is narrow, dust is more, high-frequency vibration is generated when a motor operates, and workers need to frequently move the transformer to perform multi-point measurement. The existing three-phase current transformer for mines has the obvious defects that firstly, the volume is large (the diameter is usually larger than or equal to 20cm, the height is usually larger than or equal to 12 cm), the weight exceeds 3kg, workers need to move in narrow spaces such as mine roadways by means of tool bags, the installation mode is complex, most of the three-phase current transformer is in bolted connection or snap connection, the bolted connection needs to carry tools such as wrenches, the snap connection is easy to loose under high-frequency vibration, thirdly, the motor vibration easily causes the displacement of parts in the transformer, particularly gaps are formed at the joint of iron cores, measurement errors are increased (usually more than +/-1.5%), the accurate monitoring requirement cannot be met, and fourthly, the traditional transformer is not designed to design a protection structure aiming at mine environments, the shell is easy to be corroded by dust and damaged by collision, and the service life is shortened. Therefore, there is a need for a three-phase current transformer that is compact, portable, simple to install, resistant to vibration, and adaptable to large motors for mines, to address the deficiencies of the prior art. Disclosure of utility model According to the technical problems that the size is large, the portability is poor, the installation is complex, the vibration of the mine motor easily causes the looseness of parts and the measurement accuracy is low, the three-phase current transformer for the spiral fastening type mine motor is provided. The utility model can effectively overcome the problems and meet the three-phase current measurement requirement of the mine site. The utility model adopts the following technical means: A three-phase current transformer for a screw-fastened mine motor, comprising: The device comprises a semicircular upper half body and a semicircular lower half body, wherein one end of the upper half body is hinged with one end of the lower half body through a hinge, and the other end of the upper half body is a free end and is opened and closed and locked through a screw fastening assembly; The screw fastening assembly comprises a round cap, an unlocking ring, a screw structure, a screw knob and a limiting body, wherein the screw structure is fixedly arranged on the outer side wall of the free end of the upper half body, the round cap is fixedly connected to the top end of the screw structure, the screw thread of the screw knob is sleeved at the bottom end of the screw structure, and the unlocking ring is movably sleeved on the outer side of the screw structure and is positioned between the round cap and the upper half body; The limiting body is vertically fixed on the outer side wall of the free end of the lower half body, a guide hole used for the spiral structure to penetrate through is formed in the middle of the limiting body, and a locking groove matched with the round cap is formed below the guide hole. Further, the overall diameter of the transformer is less than or equal to 15cm, and the height is less than or equal to 8cm. Further, the spiral structure is a trapezoidal thread, and the profile angle of the trapezoidal thread is 30 degrees. Further, the inner diameter of the unlocking ring is 0.5-1mm larger than the outer diameter of the spiral structure, the outer diameter of the unlocking ring is matched with the inner diameter of the guide hole of the limiting body, and an annular boss matched with the top end of the spiral knob is arranged at the bottom of the unlocking ring. Further, an annular groove is formed in the bottom of the round cap, and the inner diameter of the annular groove is matched with the outer diameter of the unlocking ring. Further, the outer side wall of the upper half body is provided with an arc handle, and the surface of the arc handle is provided with anti-skid lines. Further, the inner wall of the iron core accommodating groove is provided with an insulating bush, an iron core is placed in the iron core accommodating groove, and the surface of the iron core is wrapped with an insulating paint layer. Further, the outer side wall of the spiral knob is provided wi