阅读说明：本技术 一种真空有载调容调压油浸式变压器 (Vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer ) 是由 廖兴万 林武斌 李斌 石保虎 徐烺 于 2021-07-16 设计创作，主要内容包括：本发明公开了一种真空有载调容调压油浸式变压器,包括防护单元,防护单元包括承载件,承载件的变压油箱和油枕之间设有油管,油管与变压油箱之间连接有可松开或固定油管一端的调控单元；变压油箱上设有注油槽,注油槽开口处设置有封顶,油管一端可滑动地穿过封顶并位于注油槽中；注油槽中设有与油管一端相对设置的圆台。本发明提供的真空有载调容调压油浸式变压器,解决了现有变压油箱加油过程中有空气进入的问题。(The invention discloses a vacuum on-load capacity-regulating and pressure-regulating oil immersed transformer, which comprises a protection unit, wherein the protection unit comprises a bearing part, an oil pipe is arranged between a transformation oil tank and an oil conservator of the bearing part, and a regulating unit which can be loosened or one end of the oil pipe is fixed is connected between the oil pipe and the transformation oil tank; an oil filling groove is formed in the variable pressure oil tank, a sealing top is arranged at the opening of the oil filling groove, and one end of the oil pipe slidably penetrates through the sealing top and is positioned in the oil filling groove; the oil injection groove is internally provided with a round table which is arranged opposite to one end of the oil pipe. The invention provides a vacuum on-load capacity and voltage regulating oil-immersed transformer, which solves the problem that air enters in the oil filling process of the existing transformation oil tank.)

1. A vacuum on-load capacity-regulating and pressure-regulating oil immersed transformer is characterized by comprising a protection unit (100), wherein the protection unit (100) comprises a bearing part (101), an oil pipe (101c) is arranged between a transformation oil tank (101a) and an oil conservator (101b) of the bearing part (101), and a regulating unit (300) which can release or fix one end of the oil pipe (101c) is connected between the oil pipe (101c) and the transformation oil tank (101 a); an oil filling groove (101a-1) is formed in the variable pressure oil tank (101a), a capping (101a-2) is arranged at an opening of the oil filling groove (101a-1), and one end of an oil pipe (101c) slidably penetrates through the capping (101a-2) and is located in the oil filling groove (101 a-1); the oil filling groove (101a-1) is internally provided with a circular truncated cone (406) which is arranged opposite to one end of the oil pipe (101 c).

2. The vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 1, wherein an oil passing pan (400) is arranged in the oil filling groove (101a-1), a groove (401) is arranged at the upper bottom of the oil passing pan (400), an oil passing hole (402) is arranged at one part of the bottom of the groove (401), and one end of each of the circular truncated cone (406) and the oil pipe (101c) is positioned above the oil passing hole (402); the oil filling groove (101a-1) is internally and rotatably connected with a blocking disc (404) which can block or open the oil passing hole (402).

3. A vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 1 or 2, characterized in that the regulating and controlling unit (300) comprises a control member (301), a transmission member (302) and a clamping member (303) capable of loosening or fixing the oil pipe (101c) in a linkage manner.

4. The vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 3, wherein the regulating unit (300) is arranged on the capping (101a-2), the control element (301) comprises a handle (301a), a transfer end (301b) and a sector end (301c) which are connected, and the handle (301a) is arranged outside the transformation oil tank (101 a); the transfer end (301b) is rotationally connected with the capping (101 a-2); the oil pipe (101c) penetrates through the transfer end (301 b); the sector end (301c) is linked with the transmission piece (302).

5. A vacuum on-load regulated capacity and pressure regulating oil immersed transformer according to claim 4, characterized in that said clamping member (303) comprises a retracting jaw (303a) and a contact member (303c) which can be relatively close to or far from each other, and one end of the oil pipe (101c) is located between the retracting jaw (303a) and the contact member (303 c).

6. A vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 5, characterized in that the transmission member (302) comprises a first rack block (302a) and a screw rod (302b) which are mutually matched in a threaded manner, and further comprises a gear end (302b-1) and a second rack (302c) which are meshed with each other; the screw (302b) is rotationally connected with the top seal (101 a-2); the first rack block (302a) is meshed with the sector end (301 c); the gear end (302b-1) is arranged on the screw rod (302b), and the second rack (302c) is connected with the clamping jaw (303 a).

7. A vacuum on-load capacity-regulating pressure-regulating oil-immersed transformer according to claim 6, characterized in that the transmission member (302) further comprises a pushing ramp (303b) arranged on one side of the first rack block (302a), the abutting member (303c) comprises a shrink block (303c-1) and a pushing claw (303c-2) which are in sliding fit, and a second spring (303c-4) is connected between the shrink block and the pushing claw; the shrinkage block (303c-1) and the second rack (302c) are in sliding fit with the capping (101 a-2); the contraction block (303c-1) is contacted with the pushing inclined table (303 b); a first spring (101a-62) is arranged between the contraction block (303c-1) and the capping (101 a-2).

8. A vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 7, characterized in that the end of the pushing claw (303c-2) is provided with an arc-shaped contact edge (303c-21), and the clamping jaw (303a) is bent.

9. A vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 1, wherein the protection unit (100) further comprises a heat sink (102) arranged at the periphery of the transformation oil tank (101 a); an electrical unit (200) is arranged on the protection unit (100).

10. A vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer according to claim 9, wherein the electrical unit (200) comprises a current-carrying member (201), an iron core (202) and a winding (203), the current-carrying member (201) is arranged on the transformation oil tank (101a), and the iron core (202) and the winding (203) are both arranged in the transformation oil tank (101 a); the winding (203) is wound on the outer side of the iron core (202); the current-carrying piece (201) comprises a high-voltage bushing (201b) and a low-voltage bushing (201a), and the high-voltage bushing (201b) and the low-voltage bushing (201a) are arranged on the transformation oil tank (101a) and connected with the winding (203).

Technical Field

The invention relates to the field of distribution equipment, in particular to a vacuum on-load capacity and pressure regulating oil immersed transformer.

Background

The oil immersed transformer is a novel high-performance transformer with more reasonable structure and better performance, and the three-dimensional wound iron core has no air gap in a magnetic circuit because three core columns are arranged in a three-dimensional manner in an equilateral triangle, so that the winding is tighter, the three magnetic circuits are consistent in length and shortest, and the cross sectional area of the core columns of the iron core is closer to a circle, so that the performance is further improved, the loss is reduced, the noise is reduced, the three-phase balance is realized, the third harmonic component is reduced, and the product is more suitable for urban and rural power, the transformation of power grids of industrial and mining enterprises, and is more suitable for combined transformers and transformers for pre-installed substations.

In the use process of the vacuum on-load capacity and voltage regulating oil immersed transformer, because the oil leakage of the transformer or the periodic oil filling or the periodic oil changing is needed for ensuring the insulativity, and the water vapor in the air or the air is not considered to enter the oil tank through the conservator when the periodic oil filling or the periodic oil changing is carried out at present, the frequency of the oil filling or the replacement is accelerated, the time and the labor are consumed in the replacement or oil filling process, and the service life of the transformer is also influenced.

Disclosure of Invention

The invention aims to provide a vacuum on-load capacity-regulating pressure-regulating oil-immersed transformer, which solves the problem that air enters the existing pressure-regulating oil tank in the oiling process.

In order to achieve the purpose, the invention provides a vacuum on-load capacity-regulating and pressure-regulating oil immersed transformer which comprises a protection unit, wherein the protection unit comprises a bearing part, an oil pipe is arranged between a transformation oil tank and an oil conservator of the bearing part, and a regulating unit which can be loosened or one end of the oil pipe is fixed is connected between the oil pipe and the transformation oil tank; an oil filling groove is formed in the variable pressure oil tank, a sealing top is arranged at the opening of the oil filling groove, and one end of the oil pipe slidably penetrates through the sealing top and is positioned in the oil filling groove; the oil injection groove is internally provided with a round table which is arranged opposite to one end of the oil pipe.

As a further improvement of the invention, an oil passing disc is arranged in the oil injection groove, a groove is arranged at the upper bottom of the oil passing disc, an oil passing hole is arranged at one part of the bottom of the groove, and the circular truncated cone and one end of the oil pipe are both positioned above the oil passing hole; the oil filling groove is internally and rotatably connected with a plugging disc which can block or open the oil passing hole.

As a further improvement of the invention, the regulating and controlling unit comprises a control part, a transmission part and a clamping part which can release or fix the oil pipe in a linkage manner.

As a further improvement of the invention, the regulating and controlling unit is arranged on the top cover, the control piece comprises a handle, a transfer connecting end and a sector gear end which are connected, and the handle is arranged on the outer side of the transformation oil tank; the transfer end is rotationally connected with the capping; the oil pipe penetrates through the transfer end; the sector gear end is linked with the transmission piece.

As a further improvement of the invention, the clamping member comprises a retracting jaw and an abutting member which can be relatively close to or far away from each other, and one end of the oil pipe is positioned between the retracting jaw and the abutting member.

As a further improvement of the invention, the transmission member comprises a first rack block and a screw rod which are in threaded fit with each other, and further comprises a gear end and a second rack which are meshed with each other; the screw rod is rotationally connected with the capping; the first rack block is meshed with the sector gear end; the gear end is arranged on the screw rod, and the second rack is connected with the clamping jaw.

As a further improvement of the invention, the transmission member further comprises a pushing inclined table arranged on one side of the first rack block, the abutting member comprises a shrinkage block and a pushing claw which are in sliding fit, and a second spring is connected between the shrinkage block and the pushing claw; the contraction block and the second rack are in sliding fit with the capping; the contraction block is contacted with the pushing inclined table; a first spring is arranged between the contraction block and the top seal.

As a further improvement of the invention, the end part of the pushing claw is provided with an arc-shaped contact edge, and the retracting claw is bent.

As a further improvement of the invention, the protection unit further comprises a radiating fin arranged on the periphery of the transformation oil tank; and an electric unit is arranged on the protection unit.

As a further improvement of the present invention, the electrical unit includes a current-carrying member, an iron core and a winding, the current-carrying member is disposed on the transformation oil tank, and the iron core and the winding are both disposed in the transformation oil tank; the winding is wound on the outer side of the iron core; the current-carrying piece comprises a high-voltage bushing and a low-voltage bushing, wherein the high-voltage bushing and the low-voltage bushing are both arranged on the transformation oil tank and are connected with the winding.

Advantageous effects

Compared with the prior art, the vacuum on-load capacity and voltage regulating oil-immersed transformer has the advantages that:

1. when the oil tank needs to be oiled or changed, one end of the oil pipe is loosened through the regulating unit, and then one end of the oil pipe slightly leaves the round table in the oil filling groove, so that oil can be added into the oil filling groove. When not needing to refuel, let oil pipe one end push down the round platform, let the regulation and control unit clip fixed oil pipe one end simultaneously, just can prevent that oil from continuing to get into in the oiling groove, convenient operation not only can not get into the air in the oiling process moreover, has prolonged the frequency of changing oil to the life of extension transformer.

2. Reasonable in design, compact structure through mutually supporting between the protection unit that sets up, electric unit and the regulation and control unit, can avoid the oil tank to refuel or steam or air admission when changing oil to reduce the frequency of refueling or changing oil, and easy operation is convenient, swift, labour saving and time saving, and then guaranteed the life-span that the transformer used, it is reliable to use.

3. In the regulation and control unit, the clamping to oil pipe is realized through getting close to each other and keeping away from of clamping jaw and touch piece, avoids one of them and oil pipe contact and produce frictional force when unclamping, reduces the resistance when removing oil pipe, improves the convenience of operation.

4. The end part of the propelling claw is provided with an arc-shaped contact edge, and the retracting claw is bent, so that the wrapping property of the oil pipe is good, and the clamping stability is improved.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the overall structure of a vacuum on-load capacity and voltage regulating oil-immersed transformer;

FIG. 2 is a schematic diagram of the overall cross-sectional structure of a vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer;

FIG. 3 is a schematic diagram of a capacity regulating principle of the vacuum on-load capacity and voltage regulating oil-immersed transformer;

FIG. 4 is a schematic diagram of the voltage regulation principle of the vacuum on-load capacity and voltage regulation oil-immersed transformer;

FIG. 5 is a schematic diagram of a groove structure inside a capping part of a vacuum on-load capacity and voltage regulating oil-immersed transformer;

FIG. 6 is a schematic view of the placement of the conditioning assembly within the capping;

fig. 7 is an exploded structural schematic diagram of a regulation and control component of the vacuum on-load capacity and voltage regulation oil-immersed transformer;

FIG. 8 is a schematic structural diagram of an oil pan of the vacuum on-load capacity and voltage regulating oil-immersed transformer;

FIG. 9 is a schematic view of the connection structure of the sector end and the first rack block;

fig. 10 is a schematic view of the connection structure of the components in the square groove.

Detailed Description

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Examples

Referring to fig. 1 to 10, this embodiment provides a vacuum on-load capacity-regulating and pressure-regulating oil-immersed transformer, which includes a protection unit 100, an electrical unit 200, and a regulation unit 300. The protection unit 100 comprises a bearing part 101 and a radiating fin 102, wherein the radiating fin 102 is arranged on the periphery of a transformation oil tank 101a of the bearing part 101, the bearing part 101 further comprises an oil conservator 101b, and the transformation oil tank 101a is connected with the oil conservator 101b through an oil pipe 101 c. The electric unit 200 is disposed on the shield unit 100.

The regulating unit 300 is disposed at a connection position of the oil pipe 101c and the variable pressure oil tank 101 a.

The regulating unit 300 comprises a control member 301, a transmission member 302 and a clamping member 303 which are linked in sequence, wherein a part of the control member 301 is arranged outside the transformation oil tank 101a, and the transmission member 302 and the clamping member 303 are arranged in the transformation oil tank 101 a.

The electrical unit 200 includes a current-carrying member 201, an iron core 202, and a winding 203, wherein the current-carrying member 201 is disposed on the transformer tank 101a, and the iron core 202 and the winding 203 are disposed in the transformer tank 101 a. The winding 203 is wound around the outside of the core 202.

The current-carrying component 201 includes a high-voltage bushing 201b and a low-voltage bushing 201a, and both the high-voltage bushing 201b and the low-voltage bushing 201a are disposed on the transformer oil tank 101a and connected to the winding 203.

Concretely, this technical scheme's vacuum has to carry transfers and holds pressure regulating oil-immersed transformer, through the protection unit 100 that sets up, electric unit 200 and regulation and control unit 300 between mutually supporting, can avoid the oil tank to refuel or steam or air admission when changing oil to reduce the frequency of refueling or changing oil, and easy operation is convenient, swift, labour saving and time saving, and then guaranteed the life-span that the transformer used. The protection unit 100 plays a role in dissipating heat, storing and carrying the electrical unit 200 and the control unit 300, and includes a carrier 101 and a heat sink 102, wherein the heat sink 102 is disposed on the periphery of the transformer tank 101a of the carrier 101. The heat sink 102 has a sheet-like structure, and preferably, the transformer tank 101a and the heat sink 102 are integrated. The electric unit 200 is disposed on the shield unit 100. The regulating unit 300 has the function of regulating and controlling the transmission of the transformer oil by the conservator 101b, so that air or water vapor is prevented from entering the transformation oil tank 101a when oil is added or changed, and the regulating unit is arranged at the connection position of the transformation oil tank 101a and the conservator 101b of the bearing part 101.

Furthermore, two ends of an oil pipe 101c of the conservator 101b are respectively connected with the conservator 101b and an oil filling port 101a-3 of the variable pressure oil tank 101a, and are communicated with an oil filling groove 101a-1, it should be noted that an oil inlet hole 101b-1 is formed in the conservator 101b, and a sealing cover 101b-2 is arranged on the oil inlet hole 101 b-1.

Further, the electrical unit 200 includes a current-carrying member 201, an iron core 202 and a winding 203, the current-carrying member 201 is fixed on the transformation oil tank 101a, and the iron core 202 and the winding 203 are both disposed in the transformation oil tank 101 a; the winding 203 is wound on the outer side of the iron core 202, the current-carrying member 201 comprises a high-voltage bushing 201b and a low-voltage bushing 201a, the high-voltage bushing 201b and the low-voltage bushing 201a are both arranged on the transformation oil tank 101a and are connected with the winding 203, and the winding 203 is divided into a low-voltage winding and a high-voltage winding;

the electrical unit 200 further includes an on-load regulation control 204, the on-load regulation control 204 is disposed on the transformation oil tank 101a and connected to the winding 203, specifically, the on-load regulation control 204 is divided into an on-load capacity regulating switch (not shown in the figure) and an on-load voltage regulating switch (not shown in the drawing), and the transformer capacity regulating principle (as shown in fig. 3): the transformer low-voltage winding is composed of a few sections of wire turns I and a plurality of sections of wire turns III, the transformer three-phase high-voltage winding is connected into a triangle when the capacity is large, is connected into a star when the capacity is small, the sections II and III are connected in parallel and then are connected with the section I in series when the capacity is large, and the section I is all connected in series when the capacity is small; when the high capacity is adjusted to the low capacity, the number of turns of the low-voltage winding is increased, the high-voltage winding is changed into a Y connection method, and the low-voltage winding and the high-voltage winding are connected in series or in parallel and are realized through an on-load capacity adjusting switch; transformer voltage regulation principle (as shown in fig. 4): according to the actual voltage condition, when the voltage needs to be regulated, the tap position of the high-voltage winding is changed through the on-load tap changer, so that the number of turns of the winding of the high-voltage side access circuit is changed to realize voltage regulation.

Furthermore, two ends of an oil pipe 101c of the conservator 101b are respectively connected with the conservator 101b and an oil filling port 101a-3 of the variable pressure oil tank 101a, and are communicated with an oil filling groove 101a-1, it should be noted that an oil inlet hole 101b-1 is formed in the conservator 101b, and a sealing cover 101b-2 is arranged on the oil inlet hole 101 b-1.

Furthermore, a oiling groove 101a-1 is arranged at the top of the variable pressure oil tank 101a, a capping 101a-2 is arranged at the opening of the oiling groove 101a-1, and an oiling port 101a-3 is arranged on the capping 101 a-2.

The oil pipe 101c has one end slidably passing through the oil filling port 101a-3, the end disposed in the oil filling tank 101a-1, and the clamping member 303 disposed in the top closure 101a-2 for clamping the oil pipe 101 c.

The bottom of the tank 101a-1 is provided with an oil through port 101a-11 for communicating the tank 101a-1 with the inside of the variable pressure tank 101 a.

An oil passing disc 400 is further arranged in the oil filling groove 101a-1, a groove 401 is formed in the upper bottom of the oil passing disc 400, an oil passing hole 402 is formed in the upper half portion of the groove 401, a support column 403 is arranged in the middle of the oil passing disc 400, a blocking disc 404 is rotatably sleeved on the support column 403 and arranged in the groove 401, and the oil passing hole 402 can be blocked by the blocking disc 404.

The blocking disc 404 can rotate around the pillar 403 in the groove 401, and the oil passing hole 402 can be completely blocked or opened during the rotation. In practical use, the oil amount in the oil filling groove 101a-1 is not lower than that of the oil passing hole 402, the structure can ensure that oil is firstly precipitated in the oil filling groove 101a-1 in the filling process, specifically, even if the oil is splashed in the filling process, bubbles are splashed in the oil passing disc 400, the oil in the space in the oil filling groove 101a-1 at the bottom of the oil passing disc 400 can ensure that no bubbles exist, and even if a small amount of bubbles are precipitated, the bubbles rise to the oil passing disc 400 and are further dissipated.

The third spring 405 is arranged on the top edge of the oil passing disc 400, the top end of the third spring 405 is contacted with the bottom surface of the capping 101a-2, and the third spring 405 can ensure that the oil passing disc 400 is subjected to downward force, so that the oil passing disc 400 is prevented from moving upwards under buoyancy or other conditions, and the bottom surface of the oil passing disc 400 is higher than the oil level.

The pillar 403 is provided with a circular truncated cone 406, the radius of the top end of the circular truncated cone 406 is smaller than the inner diameter of the oil pipe 101c, and the diameter of the bottom surface of the circular truncated cone 406 is larger than the inner diameter of the oil pipe 101 c. By adjusting the distance between one end of the oil pipe 101c and the circular truncated cone 406, the gap between the two ends can be adjusted, so that the oil inlet speed is adjusted, and when the end of the oil pipe 101c is abutted against the side wall of the circular truncated cone 406, the oil pipe 101c is blocked by the circular truncated cone 106.

The control member 301 comprises a handle 301a, a switching end 301b and a sector end 301c which are connected in sequence, and the handle 301a is arranged on the outer side of the transformer oil tank 101 a.

The first bearing 101a-4 is arranged in the oil filling port 101a-3 in the top cover 101a-2, and the switching end 301b is embedded in the first bearing 101 a-4. Sector-shaped groove 101a-5 is formed in top seal 101a-2, and sector-shaped tooth end 301c is formed in sector-shaped groove 101 a-5.

The top seal 101a-2 is also provided with a square groove 101a-6 parallel to the sector groove 101a-5, the side surface of the sector groove 101a-5 is provided with a first guide groove 101a-7, and the first guide groove 101a-7 is communicated with the sector groove 101a-5 and the square groove 101 a-6.

The transmission member 302 includes a first rack block 302a and a screw 302b, the first rack block 302a is disposed in the first guide groove 101a-7, and the first rack block 302a is connected with the sector end 301c by gear engagement on the side. The screw 302b penetrates through the first rack block 302a and is in threaded fit with the first rack block, the end of the screw 302b is embedded into the circular fixing groove 101a-8 arranged on the side wall of the first guide groove 101a-7, and the circular fixing groove 101a-8 is communicated with the square groove 101 a-6.

The first bearing 101a-4 fixes the transition end 301b at the outer side of the oil pipe 101c, the transition end 301b is in interference fit with the inner ring of the first bearing 101a-4, and the inner side of the transition end 301b is not in contact with the oil pipe 101 c.

The sector-shaped slot 301c is disposed in the sector-shaped groove 101a-5, the sector-shaped slot 301c rotates when the handle 301a is pulled, and the sector-shaped groove 101a-5 is a groove disposed in the cover top 101a-2 and adapted to allow the sector-shaped slot 301c to rotate therein.

The screw 302b is inserted into the circular fixing groove 101a-8 through a bearing, so that it is more easily rotated.

The first rack block 302a is provided with a screw hole corresponding to the thread parameter on the screw 302b from the side surface, so that when the first rack block 302a moves in the first guide groove 101a-7, the screw 302b rotates due to the matching relation of the screw 302b and the thread on the first rack block 302 a; when the first guide grooves 101a to 7 are restricted to the first rack block 302a, the latter is restricted to be slidable in the axial direction of the screw 302 b.

When the handle 301a is pulled, the fan-tooth end 301c rotates, and then the first rack block 302a is driven to slide in the first guide groove 101a-7 along the axial direction of the screw 302b, and then the screw 302b rotates.

The transmission member 302 further includes two second rack gears 302c, and the second rack gears 302c are disposed in the square grooves 101 a-6. Both ends of the screw 302b are provided with gear ends 302b-1, and the two second racks 302c are respectively engaged with the gear ends 302b-1 at both ends of the screw 302 b. The two second racks 302c move in the same direction.

The square grooves 101a-6 are provided with groove structures for limiting the second rack 302c, so that the second rack 302c moves along the direction perpendicular to the axis of the screw 302 b. After the screw 302b rotates, the second rack 302c moves under the cooperation of the second rack 302c and the gear end 302 b-1.

The clamp 303 includes a retracting jaw 303a, and the retracting jaw 303a is connected to an inner side surface of the second rack 302 c. The thrust ramp 303b is provided on the side of the first rack block 302 a.

The second rack 302c is driven by the screw 302b to move, and drives the gripping jaw 303a to move, so that the gripping jaw 303a approaches to or departs from the oil pipe 101 c.

The bottom of the square groove 101a-6 is provided with a second guide groove 101a-61, and the second guide groove 101a-61 is internally provided with a first spring 101 a-62.

The clamp member 303 further includes an abutting member 303c, and the abutting member 303c is disposed in the second guide grooves 101a to 61. One end of the oil pipe 101c is located between the gripping jaw 303a and the interference member 303 c.

The abutting member 303c includes a contracting block 303c-1 and a pushing claw 303c-2, the contracting block 303c-1 is disposed in the side surface second guide groove 101a-61, and the first spring 101a-62 is connected to the side surface of the contracting block 303 c-1.

The side surface of the contraction block 303c-1 is provided with a third guide groove 303c-3, one end of the pushing claw 303c-2 is arranged in the third guide groove 303c-3, and the end of the pushing claw 303c-2 is connected with the third guide groove 303c-3 through a second spring 303 c-4.

The end of the pushing jaw 303c-2 is provided with an arcuate contact edge 303 c-21. The clamping jaw 303a is curved, and in this embodiment, the clamping jaw 303a is divided into two symmetrical parts, and each part has a quarter of a circular arc. The left and right portions of the gripping jaw 303a are connected to the two second racks 302c, respectively.

When the handle 301a is pulled clockwise as shown in fig. 6, the first rack block 302a moves and then the pushing ramp 303b moves to push the contracting block 303c-1 in the direction a, the first spring 101a-62 is compressed, the arc-shaped contact edge 303c-21 contacts the side surface of the oil pipe 101c, so that the end of the pushing claw 303c-2 is pressed into the third guide groove 303c-3, the second spring 303c-4 is compressed, the first spring 101a-62 and the second spring 303c-4 make the abutting part 303c adapt to the distance between the latter and the oil pipe 101c, and the compression makes the spring accumulate force, so that the arc-shaped contact edge 303c-21 contacts the side wall of the oil pipe 101c with a certain force, it should be noted that, while the abutting part 303c moves in the direction a, the second rack 302c moves in the direction opposite to the direction a, so that the contact member 303c and the gripping jaw 303a together grip the oil pipe 101 c.

In summary, the gripping of the oil pipe 101c can be achieved by simultaneously moving the retracting jaw 303a and the arc-shaped contact edges 303c-21 towards the oil pipe 101c by pulling the handle 301a, and correspondingly, the retracting jaw 303a and the arc-shaped contact edges 303c-21 can be simultaneously moved in opposite directions to release the gripping of the oil pipe 101 c.

The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.