A transformer body clamping device

Abstract

The present application relates to the technical field of mutual inductor processing, and particularly relates to a mutual inductor body clamping device. The mutual inductor body clamping device comprises a device base, two opposite and spaced telescopic driving devices are arranged on the device base, the telescopic ends of the telescopic driving devices are connected with clamping blocks, the opposite sides of the two clamping blocks are both provided with clamping grooves, and the telescopic driving devices are used for driving the two clamping blocks to approach each other to push the two primary winding arms of the mutual inductor body to approach each other. The clamping process is completed by the cooperation of the telescopic driving devices and the clamping blocks to provide clamping force for the mutual inductor body, the labor intensity of the operator is reduced, and the work efficiency is improved. Moreover, the clamping grooves of the two clamping blocks can be attached to the outer circumferential surfaces of the two arms of the mutual inductor body, the force of the telescopic driving devices on the clamping blocks always keeps the same direction, so that the clamping blocks can stably clamp the mutual inductor body, and the deviation of the clamping position caused by the deviation of the clamping blocks along the axial direction of the mutual inductor body is avoided.

Description

Technical Field

[0001] This invention relates to the field of current transformer processing technology, and more specifically to a current transformer body clamping device. Background Technology

[0002] Current transformers are key components in power systems, converting large current signals from the primary power grid into standard small current signals with high accuracy and according to a specified ratio. A current transformer consists of an insulating porcelain bushing and the transformer body, such as... Figure 1 As shown, the transformer body mainly includes a primary winding 20 and a secondary coil 21. The primary winding 20 is composed of a U-shaped metal conductor of aluminum or copper wrapped with a capacitive insulating material (cable paper and aluminum foil). The secondary coil 21 is sleeved on the end of the primary winding 20 away from the U-shaped opening. The two arms of the primary winding 20 form the two primary winding arms 26 of the transformer body. When assembling the transformer body and the insulating porcelain bushing, the two primary winding arms 26 of the transformer body need to be inserted into the inner cavity of the insulating porcelain bushing. However, the two primary winding arms 26 of the transformer body are parallel to each other in their natural state, and the distance between the two arms is relatively large. The two arms in the parallel state cannot be inserted into the inner cavity of the insulating porcelain bushing with a small diameter. Therefore, during production, it is necessary to reduce the distance between the two primary winding arms 26 of the transformer body to the specified size, and then tie non-woven glass tape 22 at intervals along the length of the primary winding arms 26 for fixation, so that the transformer body can be inserted into the insulating porcelain bushing.

[0003] To reduce the distance between the two primary winding arms of a current transformer body, a common method in the prior art is to use a tensioner to apply force at a specific location to tighten it to a specified size. The tensioner includes a tension buckle and a tension band. The tension buckle is fixed to one end of the tension band. In use, the tensioner is wrapped around the end of the two primary winding arms closest to the U-shaped opening, and the other end of the tension band passes through the tension buckle. The operator swings the tension buckle back and forth, gradually tightening the tension band, thereby gradually tightening the two primary winding arms of the current transformer body. When the two primary winding arms of the current transformer body are clamped together and in contact with the measuring block between the two primary winding arms, the two primary winding arms of the current transformer body are tightened to the specified size.

[0004] Although the tensioner can tighten the two primary winding arms of the transformer body, the clamping force required to hold the transformer body is large, resulting in a long tensioning length. Since the tensioning length of the tensioning band during each sway of the tensioning buckle is equal to the pitch of the ratchet teeth, operators need to repeatedly sway the tensioning buckle, leading to high labor intensity and low work efficiency. Furthermore, the surface of the cable paper and aluminum foil covering the primary windings is relatively smooth. The large tensioning force exerted by the tensioner on the two primary winding arms of the transformer body makes the tensioner prone to slipping during buckle swaying, causing deviations in the tensioning position, especially at locations where the primary winding arms gradually tilt after being deformed by pressure. Furthermore, since the step distance of the tensioner is fixed each time the tensioning buckle oscillates, when the difference between the distance between the two primary winding arms and the specified distance is greater than or less than the step distance of the tensioner, continuing to oscillate once will cause the distance between the two primary winding arms to be less than the specified distance. If it does not oscillate again, it will cause the distance between the two primary winding arms to be greater than the specified distance. Therefore, the tensioning effect of the tensioner is limited by the step distance of the tensioner. Summary of the Invention

[0005] The purpose of this invention is to provide a current transformer body clamping device to solve the technical problems of high labor intensity, low work efficiency, and easy deviation of clamping position when using tensioners to clamp the current transformer body in the prior art.

[0006] To achieve the above objectives, the technical solution of the current transformer body clamping device provided by the present invention is as follows:

[0007] A current transformer body clamping device includes a device base, on which two telescopic drive devices are provided at intervals facing each other. The telescopic ends of the telescopic drive devices are connected to clamping blocks. The opposing sides of the two clamping blocks are provided with clamping grooves for clamping the outer peripheral surfaces of the two primary winding arms of the current transformer body. The telescopic drive devices are used to drive the two clamping blocks to move closer to each other so as to push the two primary winding arms of the current transformer body to move closer to each other.

[0008] The beneficial effects are as follows: In the current transformer body clamping device of the present invention, the current transformer body placed on the device base is located between two clamping blocks. When the telescopic end of the telescopic drive device extends, the telescopic end drives the corresponding clamping block's locking groove to fit against the two arms of the current transformer body and clamp the current transformer body along the opposite direction of the two telescopic drive devices, causing the current transformer body to deform and tighten under pressure. The entire clamping process provides clamping force for the deformation and tightening of the primary winding arm of the current transformer body through the cooperation of the telescopic drive device and the clamping blocks, reducing the labor intensity of operators and improving work efficiency. Furthermore, since the locking grooves of the two clamping blocks can fit against the outer peripheral surfaces of the two arms of the current transformer body, and the force exerted by the telescopic drive device on the clamping blocks always remains in the same direction, the clamping blocks can stably clamp the current transformer body, avoiding the situation where the clamping blocks shift along the axial direction of the current transformer body during the clamping process, resulting in a deviation in the clamping position.

[0009] As a further improvement, a straightening support is fixed at one end of the two telescopic drive devices facing each other, which is used to straighten the telescopic drive devices in a direction perpendicular to the direction in which the two telescopic drive devices face each other.

[0010] The beneficial effect is that this design helps to ensure that the clamping force of the telescopic drive device on the transformer body is along the opposite direction of the two telescopic drive devices, thus avoiding the situation of the telescopic end becoming skewed after long-term operation.

[0011] As a further improvement, the straightening support includes two vertical plates that are fixed parallel to each other on the base of the device along the opposite direction of the two telescopic drive devices. The four corners of the two vertical plates are connected with screws, and the two ends of the screws are respectively connected and fixed to the corresponding vertical plates by nuts.

[0012] The beneficial effects are: this design, with the screw connecting the two vertical plates, will increase the overall structural strength of the straightening support, and the screw and the vertical plates can be detached, which facilitates the installation and disassembly of the telescopic drive device.

[0013] As a further improvement, the telescopic end of the telescopic drive device is detachably connected and fixed to the clamping block.

[0014] The beneficial effects are: this design allows for the replacement of clamping blocks of the appropriate size according to the specifications of the transformer body, ensuring that the clamping slots of the clamping blocks are always in close contact with the outer periphery of the two arms of the transformer body to guarantee the clamping effect and improve the versatility of the transformer body clamping device.

[0015] As a further improvement, the outer circumferential surface of the telescopic end is provided with external threads, and the clamping block is provided with internal threaded holes, and the telescopic end is threadedly connected and fixed to the clamping block.

[0016] As a further improvement, a torque transmission structure is provided on the outer circumference of the telescopic end.

[0017] The beneficial effect is that this design allows the operator to transmit torque to the telescopic end through a torque transmission structure, making it easier to install or remove the telescopic end.

[0018] As a further improvement, the telescopic end and the clamping block are hinged together along the vertical axis.

[0019] The beneficial effects are: with this design, the clamp can swing around the vertical axis as the hinge axis, so as to automatically adjust the angle between the clamp and the axis of the telescopic end when the two arms of the current transformer body are tilted, ensuring the fit between the clamp and the current transformer body, and avoiding the situation where the contact area between the clamp and the tilted current transformer body is reduced when the clamp remains stationary, which would cause the edge of the clamp to damage the surface of the current transformer body.

[0020] As a further improvement, the telescopic drive device includes a hydraulic cylinder, the piston rod of which is connected to a clamping block for pushing the two primary winding arms of the transformer body closer together in the opposite direction of the two telescopic drive devices, and the end of the piston rod constitutes the telescopic end.

[0021] The beneficial effects are: with this design, the hydraulic cylinder has a larger clamping force on the transformer body and operates smoothly, making it easier for operators to observe in real time whether the transformer body is clamped in place and to shut down the hydraulic cylinder in a timely manner.

[0022] As a further improvement, the transformer body clamping device also includes a control valve, which is connected to two hydraulic cylinders to control the synchronous extension and retraction of the two hydraulic cylinders.

[0023] The beneficial effect is that this design helps to control the piston rods of the two hydraulic cylinders to extend or retract synchronously, so as to ensure that the two clamping blocks clamp or release the transformer body at the same time.

[0024] As a further improvement, the device base has a support surface, and the transformer body clamping device also includes an auxiliary support. The auxiliary support and the device base are arranged at intervals along the direction perpendicular to the two telescopic drive devices, and are used to support the two ends of the transformer body along the length of the primary winding arm, respectively.

[0025] The beneficial effects are: with this design, the device base has the function of supporting the transformer body, reducing the need for additional support structures and simplifying the transformer body clamping device. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the current transformer body after clamping;

[0027] Figure 2 This is an assembly diagram of the device base in the current transformer body clamping device of the present invention;

[0028] Figure 3 This is a schematic diagram of the auxiliary support structure in the current transformer body clamping device of the present invention;

[0029] Figure 4 This is a schematic diagram of the current transformer body before clamping;

[0030] Figure 5 This is a schematic diagram of the structure of the current transformer body after clamping;

[0031] Figure 6 yes Figure 2 A partial assembly diagram of the piston rod and clamping block;

[0032] Figure 7 yes Figure 2 Schematic diagram of the middle clamping block;

[0033] Figure 8 This is a diagram of the hydraulic system of the current transformer body clamping device of the present invention;

[0034] Figure 9 This is an electrical system diagram of the current transformer body clamping device of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 11. Device base; 12. Auxiliary support; 13. Hydraulic cylinder; 14. Clamping block; 15. Hydraulic pump; 16. Piston rod; 17. Clamping plane; 18. Telescopic end; 19. Snap-fit ​​groove; 20. Primary winding; 21. Secondary coil; 22. Woven glass strip; 23. Electromagnetic reversing valve; 24. Clamping button; 25. Releasing button; 26. Primary winding arm; 27. Straightening support. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply such an actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising a…" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] In the description of this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0041] The present invention will be further described in detail below with reference to embodiments.

[0042] Embodiment 1 of the current transformer body clamping device of the present invention:

[0043] The transformer body clamping device of the present invention is used to clamp the two primary winding arms 26 of the transformer body, so that the distance between the two primary winding arms 26 is tightened to a specified size, so that the transformer body can be inserted into the inner cavity of the insulating porcelain sleeve.

[0044] like Figures 2 to 5As shown, the transformer body clamping device includes a base 11, an auxiliary support 12, a telescopic drive device, a hydraulic system, and an electrical system. Two telescopic drive devices are arranged at intervals facing each other on the base 11. The base 11 has a support surface. The base 11 and the auxiliary support 12 are arranged parallel to each other at intervals along a direction perpendicular to the facing direction of the two telescopic drive devices, respectively supporting both ends of the transformer body along the length of the primary winding arm 26. Specifically, the auxiliary support 12 supports one end of the transformer body corresponding to the U-shaped opening, and the support surface of the base 11 supports the other end of the transformer body, so that the telescopic end 18 of the telescopic drive device is aligned with a predetermined clamping position on the transformer body. In this embodiment, the facing direction of the two telescopic drive devices is defined as the front-back direction.

[0045] It should be noted that the clamping position of the current transformer body clamping device of the present invention is set on the side of the current transformer body away from the U-shaped opening, so as to reduce the clamping distance and improve the clamping operation efficiency.

[0046] A straightening support 27 is fixed to one end of each of the two telescopic drive devices facing each other. The straightening support 27 includes two vertical plates that are fixed parallel to each other and spaced apart on the device base 11 along the facing direction of the two telescopic drive devices. Screws are connected to the four corners of the two vertical plates one by one, and the two ends of the screws are connected and fixed to the corresponding vertical plates by nuts. The straightening support 27 straightens the telescopic drive devices along the facing direction perpendicular to the two telescopic drive devices, so as to prevent the telescopic ends 18 of the telescopic drive devices from bending and deforming after long-term operation, which would cause the telescopic direction to deviate.

[0047] like Figure 6 and Figure 7 As shown, the telescopic drive device is a hydraulic cylinder 13. The piston rod 16 of the hydraulic cylinder 13 is connected to a clamping block 14 at its end. The two clamping blocks 14 have opposing engagement grooves 19 on their facing sides, which are adapted to the outer circumferential surface of the primary winding arm 26 of the transformer body. The outer circumferential surface of the piston rod 16 has external threads, and the clamping blocks 14 have internal threaded holes. The end of the piston rod 16 is threadedly connected to the clamping blocks 14. The outer circumferential surface of the piston rod 16 has two clamping planes 17 distributed circumferentially in opposite directions, facilitating the operator to clamp the piston rod 16 for assembly work. In this embodiment, the end of the piston rod 16 forms a telescopic end 18, and the clamping planes 17 form a torque transmission structure.

[0048] like Figures 8 to 9As shown, the hydraulic system includes a hydraulic pump 15 and a solenoid directional valve 23. The hydraulic cylinder 13 is also part of the hydraulic system, and the electrical system controls the working state of the hydraulic system. The two hydraulic cylinders 13 are connected to the same hydraulic pump 15 and the same solenoid directional valve 23. The hydraulic pump 15 supplies hydraulic oil to the hydraulic cylinders 13, and the solenoid directional valve 23 controls the synchronous extension and retraction of the piston rods 16 of the two hydraulic cylinders 13. When the clamping button 24 of the electrical system is pressed, the 1YA coil of the solenoid directional valve 23 is energized, causing the hydraulic oil drawn by the hydraulic pump 15 to flow into the forward chamber of the hydraulic cylinder 13. The hydraulic cylinder 13 advances in the opposite direction of the two telescopic drive devices, causing the two clamping blocks 14 to move closer together to push the two primary winding arms 26 of the transformer body to deform and tighten until they reach the specified size. When the release button 25 of the electrical system is pressed, the 2YA coil of the solenoid directional valve 23 is energized, causing the hydraulic oil drawn by the hydraulic pump 15 to flow into the retraction chamber of the hydraulic cylinder 13. The hydraulic cylinder 13 retracts in the opposite direction of the two telescopic drive devices, causing the two clamping blocks 14 to move away from each other to release the two primary winding arms 26 of the transformer body. In this embodiment, the solenoid directional valve 23 constitutes a control valve.

[0049] In actual use, the corresponding clamping block 14 can be replaced according to the size of the transformer body so that the snap-fit ​​groove 19 on the clamping block 14 is always adapted and fitted to the outer peripheral surface of the transformer body.

[0050] In the current transformer body clamping device of the present invention, the current transformer body placed on the device base is located between two clamping blocks 14. When the piston rod 16 of the telescopic drive device extends, the piston rod 16 drives the corresponding clamping block 14's snap-fit ​​groove 19 to fit against the two primary winding arms 26 of the current transformer body and clamp the current transformer body along the opposite direction of the two telescopic drive devices. This causes the two primary winding arms 26 of the current transformer body to be compressed, deformed, and tightened. The entire clamping process provides clamping force to the current transformer body through the cooperation of the telescopic drive device and the clamping blocks 14, reducing the labor intensity of the operator and improving work efficiency. Furthermore, since the snap-fit ​​groove 19 of the clamping block 14 can fit against the outer peripheral surface of the two primary winding arms 26 of the current transformer body, the force exerted by the telescopic drive device on the clamping block 14 always remains in the same direction, enabling the clamping block 14 to stably clamp the current transformer body at the set position and preventing the clamping block 14 from shifting along the length direction of the primary winding arm 26 during the clamping process, which would cause a deviation in the clamping position.

[0051] Embodiment 2 of the current transformer body clamping device provided in this invention:

[0052] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the telescopic end 18 is threadedly connected to the clamping block 14 to achieve a detachable connection between the telescopic end 18 and the clamping block 14. In this embodiment, the telescopic end 18 and the clamping block 14 are hinged along the vertical axis. Specifically, the telescopic end 18 is inserted into the hinge hole of the clamping block 14, and a hinge shaft extending vertically is mounted on the telescopic end 18, with both ends of the hinge shaft inserted into the wall of the hinge hole. In other embodiments, the telescopic end 18 can be welded to the clamping block 14.

[0053] Embodiment 3 of the current transformer body clamping device provided in this invention:

[0054] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the telescopic drive device includes a hydraulic cylinder 13, with the piston rod 16 of the hydraulic cylinder 13 connected to the clamping block 14, and the end of the piston rod 16 forming the telescopic end 18. In this embodiment, the telescopic drive device is a screw-nut mechanism. The rotating screw drives the nut to move forward and backward along the two clamping blocks 14 in opposite directions. A drive rod extending along the opposite directions of the two telescopic drive devices is connected to the nut, and the end of the drive rod is connected to the clamping block 14. In other embodiments, the telescopic drive device can be a cylinder.

[0055] Embodiment 4 of the current transformer body clamping device provided in this invention:

[0056] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the device base 11 has a support surface, and the transformer body clamping device further includes an auxiliary support 12. The auxiliary support 12 and the device base 11 are arranged at intervals along the direction perpendicular to the two telescopic drive devices, and are used to support the two ends of the transformer body along the length of the primary winding arm 26, respectively. In this embodiment, the device base 11 does not have a support surface. The device base 11 is only used to clamp the transformer body through clamping blocks. To support the transformer body, an additional support seat is required to cooperate with the auxiliary support 12 to support the two ends of the transformer body along the primary winding arm 26.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A clamping device for a current transformer body, characterized in that, The device includes a base (11) and an auxiliary support (12). The base (11) has a support surface for supporting the transformer body during clamping. The auxiliary support (12) and the base (11) are arranged at intervals on a plane parallel to the ground along the direction perpendicular to the two telescopic drive devices. They are used to support the two ends of the transformer body along the length of the primary winding arm (26) so that the primary winding arm (26) is flat. The base (11) is provided with two telescopic drive devices that are distributed at intervals in opposite directions. The telescopic end (18) of the telescopic drive device is hinged to a clamping block (14) along the vertical axis. The two clamping blocks (14) are provided with clamping grooves (19) on the opposite sides for clamping the outer circumferential surfaces of the two primary winding arms (26) of the transformer body. The telescopic drive devices are used to drive the two clamping blocks (14) to move closer to each other to push the two primary winding arms (26) of the transformer body to move closer to each other. The support surface is located between the two clamping blocks.

2. The transformer body clamping device according to claim 1, characterized in that, The telescopic end (18) has an external thread on its outer circumference and the clamping block (14) has an internal thread hole. The telescopic end (18) and the clamping block (14) are threadedly connected and fixed.

3. The transformer body clamping device according to claim 1, characterized in that, A straightening support (27) is fixed at one end of the two telescopic drive devices facing each other, which is used to straighten the telescopic drive devices in a direction perpendicular to the direction in which the two telescopic drive devices face each other.

4. The transformer body clamping device according to claim 3, characterized in that, The straightening support (27) includes two vertical plates that are fixed parallel to each other on the device base (11) along the opposite direction of the two telescopic drive devices. The four corners of the two vertical plates are connected with screws, and the two ends of the screws are respectively connected and fixed to the corresponding vertical plates by nuts.

5. The transformer body clamping device according to claim 2, characterized in that, The telescopic end (18) has a torque transmission structure on its outer circumferential surface.

6. The transformer body clamping device according to claim 1, 3, or 4, characterized in that, The telescopic drive device includes a hydraulic cylinder (13), the piston rod (16) of the hydraulic cylinder (13) is connected to the clamping block (14) and is used to push the primary winding arm (26) of the transformer body to move closer to each other in the opposite direction of the two telescopic drive devices. The end of the piston rod (16) constitutes the telescopic end (18).

7. The transformer body clamping device according to claim 6, characterized in that, The transformer body clamping device also includes a control valve, which is connected to two hydraulic cylinders (13) to control the synchronous extension and retraction of the two hydraulic cylinders (13).

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