CN212273451U

CN212273451U - Pumping unit centralizer

Info

Publication number: CN212273451U
Application number: CN202020388318.2U
Authority: CN
Inventors: 饶德林; 柳转阳; 赵奇峰; 边喜娟; 张淼; 曾荣; 宗丽娟; 霍静; 欧毅; 丁金铎; 武连永; 黄建; 唐小军; 苟建义; 徐艳玲; 张伟; 杨立华; 马向波; 郭玲; 张孝宁
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2021-01-01
Anticipated expiration: 2030-03-24

Abstract

The utility model relates to a device is right to beam-pumping unit, its pad is located in the clearance between beam-pumping unit base and the basic support position, and this device is right to beam-pumping unit includes and right the first piece of rightting that the beam-pumping unit was right and carry out the solid fixed ring fixed to the first piece of righting, wherein: first righting piece is the platelike structure that sets up along the horizontal direction, is provided with a plurality of first bosses of preventing moving back on the top surface of first righting piece, and solid fixed ring fixes on first righting piece, is connected with the bolt between solid fixed ring and the basic support position. The utility model provides a set up the parallels between the base of beam-pumping unit and basic support position and be extruded easily, cause the technical problem of beam-pumping unit stability variation.

Description

Pumping unit centralizer

Technical Field

The utility model relates to an oil recovery engineering technical field especially relates to a beam-pumping unit righting device.

Background

At present, most oil fields in China mainly adopt beam pumping units, and one disadvantage of the beam pumping units is that the stability of the beam pumping units is gradually deteriorated under a long-time working state. The reason is that the conditions of temperature, humidity and the like of the external working environment are constantly changed, and particularly after the conditions of winter and summer, the position of the pumping unit for supporting the base can sink or deflect, so that the normal work of the pumping unit is influenced, and potential safety hazards are caused to safety production. Therefore, the staff mostly use and throw into the ramp form parallels between the base of beam-pumping unit and basic support position, play the effect of supporting, rightting to guarantee that beam-pumping unit can stable work.

At present, cast iron with an inclination angle of 10 degrees is commonly used in an oil extraction site as a sizing block, and after the sizing block is driven in, the cast iron can be extruded out from an original supporting position after long-term use due to the fact that alternating load and continuous vibration of the oil pumping unit are borne for a long time, so that the oil pumping unit loses the original stability, and even accidents such as turning over and pumping of the oil pumping unit can be caused.

The problem that the stability of the pumping unit is poor due to the fact that a sizing block arranged between a base of the pumping unit and a basic supporting position is easily extruded in the prior art is solved.

Therefore, the inventor provides the oil pumping unit righting device by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device is right to beam-pumping unit not only can play the support and the effect of rightting to the beam-pumping unit, moreover and be provided with between the beam-pumping unit base and prevent moving back the boss, frictional force between device and the beam-pumping unit base is right in the increase, makes the connection of stabilizing more between right device and the beam-pumping unit, has increased the anticreep ability of going out to guarantee the good stability of beam-pumping unit, the life of extension beam-pumping unit improves the work efficiency of beam-pumping unit, effectively prevents the emergence of incident.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides a device is right to beam-pumping unit, during the clearance between beam-pumping unit base and the basic support position was located to the pad, beam-pumping unit right the device include right the first piece of rightting that the beam-pumping unit was right and right the first piece of rightting carries out the solid fixed ring of fixing, wherein:

the first righting piece is of a plate-shaped structure arranged along the horizontal direction, a plurality of first anti-retreating bosses are arranged on the top surface of the first righting piece, the fixing ring is fixed on the first righting piece, and bolts are connected between the fixing ring and the foundation supporting position.

In a preferred embodiment of the present invention, the bottom surface of the first centering member is a plane parallel to the horizontal plane, and the top surface of the first centering member is an inclined plane having an included angle formed between the horizontal planes.

In a preferred embodiment of the present invention, an angle between the top surface of the first centering member and the bottom surface of the first centering member is 5 ° to 15 °.

In a preferred embodiment of the present invention, the first anti-moving-back boss is a long strip structure extending along the width direction of the first centering member, and each of the first anti-moving-back bosses is arranged continuously along the length direction of the first centering member, so that each of the longitudinal sections of the first anti-moving-back bosses is a zigzag shape.

The present invention provides a portable electronic device, wherein the first anti-retreat boss includes a first vertical surface and a first inclined surface, the bottom of the first vertical surface and the bottom of the first inclined surface are connected to the top surface of the first righting member, the top of the first vertical surface is connected to the top of the first inclined surface, and the first inclined surface is inclined to the same direction as the top surface of the first righting member.

In a preferred embodiment of the present invention, the first guide shoe is provided at one end of the first centering member, and the fixing ring is located at the other end of the first centering member opposite to the first guide shoe.

The utility model discloses an in a preferred embodiment, the device is right to beam-pumping unit still include with first right the piece cooperate right the piece is right the second that the beam-pumping unit was right is right, the second right the piece set up in on the top surface of first right the piece, it prevents moving back the boss to be provided with a plurality of seconds on the top surface of second right the piece, be provided with on the bottom surface of second right the piece with each first prevent moving back a plurality of third of boss matched with and move back the boss, each the third prevent moving back boss and each first prevent moving back boss cooperation joint.

The utility model discloses an in a preferred embodiment, the second is right the piece and is the flat structure, the second right the piece with the top surface of first right the piece parallels, the second prevent move back the boss with the third is prevented moving back the boss and is followed the rectangular form structure that the width direction of second right the piece extends, each the second is prevented moving back between the boss and each the third is prevented moving back all to follow between the boss the length direction of second right the piece is arranged in succession, so that each the second is prevented moving back the longitudinal section of boss and each the longitudinal section that the third was prevented moving back the boss all is the cockscomb structure.

The utility model discloses an in a preferred embodiment, the second is prevented moving back the boss and is included the vertical face of second and second inclined plane, the bottom of the vertical face of second with the bottom on second inclined plane all with the top surface of second righting piece is connected, the top of the vertical face of second with the top of second inclined plane is connected, the second inclined plane with the top surface of first righting piece inclines to the same direction.

In a preferred embodiment of the present invention, a second guide shoe is disposed at one end of the second centering member.

The utility model discloses an in a preferred embodiment, be close to on the top surface of first righting piece the one end of solid fixed ring is provided with spacing boss, on the second righting piece with the other end that the second guide shoe is relative is provided with the roof, the one end of roof with the second is right the piece and is connected, the other end of roof with spacing boss butt.

In a preferred embodiment of the present invention, the first centering member, the second centering member and the fixing ring are made of steel material.

From top to bottom, the utility model discloses a characteristics and advantage of beam-pumping unit righting device: be provided with a plurality of first preventions on the top surface of first righting piece and move back the boss, locate first righting piece pad between beam-pumping unit base and the basic holding position, the bottom surface and the basic holding position butt of first righting piece, each first top of preventing moving back the boss and the bottom butt of beam-pumping unit base, through each first prevent moving back the first frictional force of righting between boss increase and the beam-pumping unit base, improve the stability of being connected between first righting piece and the beam-pumping unit, effectively prevent that beam-pumping unit righting device from deviating from between beam-pumping unit base and the basic holding position. In addition, be connected with solid fixed ring on first righting, carry out fixed connection through the bolt to solid fixed ring and basic support position to improve the stability of being connected between first righting and the basic support position, further assurance beam-pumping unit righting device stable clamp is located between beam-pumping unit base and the basic support position, and then guarantees the good stability of beam-pumping unit, prolongs the life of beam-pumping unit greatly, improves the work efficiency of beam-pumping unit.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: do the utility model discloses the structural schematic of the first piece of righting among the beam-pumping unit righting device.

FIG. 2: do the utility model discloses the first piece and the second of righting among the beam-pumping unit righting device structure schematic diagram of righting.

FIG. 3: do the utility model discloses the plan view of the first righting piece among the beam-pumping unit righting device.

FIG. 4: do the utility model discloses the top view of second righting piece among the beam-pumping unit righting device.

The utility model provides an reference numeral does:

1. a first centralizer; 101. A first anti-back boss;

1011. a first vertical face; 1012. A first inclined surface;

102. a first guide shoe; 103. A limiting boss;

2. a fixing ring; 3. A bolt;

4. a second centralizer; 401. A second anti-back boss;

4011. a second vertical face; 4012. A second inclined surface;

402. the third prevention is to withdraw the boss; 403. A second guide shoe;

404. a top plate.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 and 3, the utility model provides a device is right to beam-pumping unit, this beam-pumping unit right the device pad locate in the clearance between beam-pumping unit base and the basic support position, this beam-pumping unit right the device including first right 1 and solid fixed ring 2, first right 1 be used for right the beam-pumping unit, gu fixed ring 2 is used for fixing first right 1. Wherein: the first centering part 1 is of a plate-shaped structure arranged along the horizontal direction, a plurality of first anti-back bosses 101 used for increasing the top friction force of the first centering part 1 are arranged on the top surface of the first centering part 1, the first centering part 1 is fixedly arranged in a gap between the edge of the pumping unit base and a basic supporting position, the bottom surface of the first centering part 1 is abutted against the basic supporting position, and the top of each first anti-back boss 101 is abutted against the bottom of the pumping unit base; the fixed ring 2 is connected with the first righting piece 1, and a bolt 3 is connected between the fixed ring 2 and the foundation support position.

The utility model discloses be provided with a plurality of first preventing on the top surface of first righting 1 and move back boss 101, locate first righting 1 pad between beam-pumping unit base and basic holding position, first righting 1's bottom surface and basic holding position butt, each first preventing moves back boss 101's top and beam-pumping unit base's bottom butt, through each first preventing moving back boss 101 increase first righting 1 and beam-pumping unit base between the frictional force, improve the stability of being connected between first righting 1 and the beam-pumping unit, effectively prevent that beam-pumping unit righting device from deviating from between beam-pumping unit base and the basic holding position. In addition, be connected with solid fixed ring 2 on first righting 1, carry out fixed connection through bolt 3 to solid fixed ring 2 and basic support position to improve the stability of being connected between first righting 1 and the basic support position, further assurance beam-pumping unit righting device stable clamp is located between beam-pumping unit base and the basic support position, and then guarantees the good stability of beam-pumping unit, prolongs the life of beam-pumping unit greatly, improves the work efficiency of beam-pumping unit.

Further, as shown in fig. 1, the first centering member 1 has a slope-like structure. Namely: the bottom surface of first righting piece 1 is the plane parallel with the horizontal plane, and the top surface of first righting piece 1 is for forming the inclined plane of contained angle with between the horizontal plane to in being convenient for pack into the clearance between beam-pumping unit base and the basic support position with beam-pumping unit righting device.

Further, the angle between the top surface of the first centering member 1 and the bottom surface of the first centering member 1 is 5 ° to 15 °.

Preferably, the angle between the top face of the first centralizer 1 and the bottom face of the first centralizer 1 is 10 °.

Further, as shown in fig. 1 and 3, the first anti-back bosses 101 are elongated structures extending along the width direction of the first centering member 1, and the first anti-back bosses 101 are continuously arranged along the length direction of the first centering member 1, so that the longitudinal sections of the first anti-back bosses 101 are zigzag, thereby increasing the friction force between the first centering member 1 and the pumping unit base.

Specifically, as shown in fig. 1, the first anti-back boss 101 includes a first vertical surface 1011 and a first inclined surface 1012, the bottom of the first vertical surface 1011 and the bottom of the first inclined surface 1012 are both connected to the top surface of the first centering member 1, the top of the first vertical surface 1011 is connected to the top of the first inclined surface 1012, and the first inclined surface 1012 and the top surface of the first centering member 1 incline in the same direction, so that the first centering member 1 is conveniently plugged into the gap between the pumping unit base and the basic supporting position, and the first centering member 1 is effectively prevented from falling out.

In an optional embodiment of the present invention, as shown in fig. 1 and 3, one end of the first centering member 1 is provided with a first guiding shoe 102, the fixing ring 2 is located at the other end of the first centering member 1 opposite to the first guiding shoe 102, and the first centering member 1 is conveniently plugged into the gap between the pumping unit base and the basic supporting position through the first guiding shoe 102, so as to facilitate the site construction of the working personnel.

Further, as shown in fig. 1, the longitudinal section of the first guide shoe 102 may be, but is not limited to, a half cone shape.

Further, the first guide shoe 102 and the first centering member 1 may be, but not limited to, integrally formed.

Further, the connection between the fixing ring 2 and the first centering member 1 may be, but is not limited to, welding.

Further, the bolt 3 may be, but not limited to, an expansion bolt or a cement nail.

In an optional embodiment of the present invention, as shown in fig. 2, the pumping unit centering device further includes a second centering member 4, the second centering member 4 is used for cooperating with the first centering member 1 to center the pumping unit, the second centering member 4 is disposed on the top surface of the first centering member 1, a plurality of second anti-moving bosses 401 are disposed on the top surface of the second centering member 4, a plurality of third anti-moving bosses 402 cooperating with the first anti-moving bosses 101 are disposed on the bottom surface of the second centering member 4, each third anti-moving boss 402 cooperates with the first anti-moving boss 101, and each third anti-moving boss 402 abuts against the top of the pumping unit base. When the clearance between the pumping unit base and the basic supporting position is small, only the first centering piece 1 is used for centering the pumping unit; when the clearance between beam-pumping unit base and the basic support position is great, use first righting 1 and second righting 4 cooperate to right the beam-pumping unit can to satisfy the needs of the angle of righting of difference, increase beam-pumping unit righting device's application scope.

Further, as shown in fig. 2 and 4, the second centering member 4 is a flat plate-shaped structure, the second centering member 4 is parallel to the top surface of the first centering member 1, the second anti-retreat bosses 401 and the third anti-retreat bosses 402 are both strip-shaped structures extending along the width direction of the second centering member 4, and the second anti-retreat bosses 401 and the third anti-retreat bosses 402 are both continuously arranged along the length direction of the second centering member 4, so that the longitudinal sections of the second anti-retreat bosses 401 and the third anti-retreat bosses 402 are both saw-toothed. Prevent moving back boss 401 through the second and prevent moving back boss 101 cooperation joint with first, guarantee that the second rights 4 and the first stability of being connected between 1, avoid in the working process because the vibration causes the second to right 4 and the first piece of righting between 1 the skew of taking place, in addition, prevent moving back boss 401 through the second and increase the second right 4 and the first piece of righting and the oil pumping machine base between frictional force, effectively prevent that the oil pumping machine righting device from deviating from between oil pumping machine base and the basic supporting position with first righting.

Further, as shown in fig. 2, the second anti-back boss 401 includes a second vertical surface 4011 and a second inclined surface 4012, the bottom of the second vertical surface 4011 and the bottom of the second inclined surface 4012 are both connected to the top surface of the second centering member 4, the top of the second vertical surface 4011 is connected to the top of the second inclined surface 4012, and the second inclined surface 4012 and the top surface of the first centering member 1 incline in the same direction, so that the first centering member 1 and the second centering member 4 can be conveniently plugged into the gap between the pumping unit base and the base supporting position, and the first centering member 1 and the second centering member 4 can be effectively prevented from coming out.

In an optional embodiment of the present invention, as shown in fig. 2 and 4, one end of the second centering member 4 is provided with a second guiding shoe 403, the second guiding shoe 403 is located above the first guiding shoe 102, and the second centering member 4 and the first centering member 1 are conveniently plugged into the gap between the pumping unit base and the foundation support position by the cooperation of the second guiding shoe 403 and the first guiding shoe 102, so as to facilitate the on-site construction of the working personnel.

Further, as shown in fig. 2, the longitudinal section of the second guide shoe 403 may be, but is not limited to, a taper.

In an optional embodiment of the present invention, as shown in fig. 1 to 4, one end of the first centering member 1 close to the fixing ring 2 is provided with a limit boss 103, the limit boss 103 is arranged along the width direction of the first centering member 1, the other end of the second centering member 4 opposite to the second guide shoe 403 is provided with a top plate 404, one end of the top plate 404 is connected to the second centering member 4, and the other end of the top plate 404 is abutted to the limit boss 103. The second centering part 4 is limited by the limiting boss 103, the stability of connection between the second centering part 4 and the first centering part 1 is guaranteed, and the second centering part 4 and the first centering part 1 are prevented from moving relatively.

Further, the second guide shoe 403 and the second centering member 4, and the top plate 404 and the second centering member 4 may be, but not limited to, integrally formed.

Further, the limiting boss 103 and the first centering member 1 may be, but not limited to, integrally formed.

Further, the first centering member 1, the second centering member 4 and the fixing ring 2 may be made of, but not limited to, steel.

Preferably, the first centering member 1, the second centering member 4 and the fixing ring 2 are all made of 45-grade steel.

The utility model discloses the use of beam-pumping unit righting device does:

when the gap between the pumping unit base and the basic supporting position is small, the first centering piece 1 is hammered into the gap between the pumping unit base and the basic supporting position from the side direction, the bottom surface of the first centering piece 1 is enabled to be abutted against the basic supporting position, the top of the first anti-return boss 101 on the first centering piece 1 is enabled to be abutted against the bottom of the pumping unit base, the inclination angle of the first centering piece 1 is adjusted according to the size of the gap, meanwhile, the bolt 3 is hammered into the fixing ring 2, the bolt 3 is enabled to be connected with the basic supporting position, and the stability of the pumping unit is guaranteed;

when the clearance between beam-pumping unit base and the basic holding position is great, place second righting piece 4 at the top of first righting piece 1, first preventing on first righting piece 1 moves back boss 101 and the third preventing on second righting piece 4 moves back boss 402 joint, make the bottom surface and the basic holding position butt of first righting piece 1, the second on second righting piece 4 prevents moving back the top of boss 401 and the bottom butt of beam-pumping unit base, adjust the inclination of first righting piece 1 according to the size in clearance, squeeze into bolt 3 on solid fixed ring 2 simultaneously, make bolt 3 be connected with basic holding position, guarantee the firm of beam-pumping unit.

The utility model discloses a beam-pumping unit righting device's characteristics and advantage are:

one, be provided with the first boss 101 that prevents moving back on the top surface of the first part of righting 1 among this beam-pumping unit righting device, through the first boss 101 that prevents moving back the first frictional force of righting between 1 and the beam-pumping unit base of righting of increase, improve the first stability of righting between 1 and the beam-pumping unit, be connected with solid fixed ring 2 on the first part of righting 1, carry out fixed connection to solid fixed ring 2 and basic holding position through bolt 3, thereby improve the first stability of righting between 1 and the basic holding position of righting, thereby guarantee that beam-pumping unit righting device stable clamp locates between beam-pumping unit base and the basic holding position, the life of extension beam-pumping unit greatly, improve the stability and the work efficiency of beam-pumping unit.

Two, this beam-pumping unit righting device can right 4 at the top cooperation joint second of first righting 1 according to the clearance size between beam-pumping unit base and the basic support position, when the clearance between beam-pumping unit base and the basic support position is great, right through first righting 1 and the cooperation of second righting 4 and right the beam-pumping unit to satisfy the needs of the different angle of righting, increase beam-pumping unit righting device's application scope.

Third, this beam-pumping unit righting device is provided with on the bottom surface of second righting piece 4 and moves back boss 402 with each first a plurality of third proofings of preventing moving back boss 101 matched with, each third proofings move back boss 402 and each first boss 101 cooperation joint that prevents moving back, neither influence the exclusive use of first righting piece 1, can right piece 4 and the stable joint of first righting piece 1 with the second again, guarantee the stability of second righting piece 4 and the joint of first righting piece 1, ensure the stable use under second righting piece 4 and the first righting piece 1 cooperation state.

Fourth, this beam-pumping unit righting device is provided with spacing boss 103 on the top surface of first righting piece 1, be provided with roof 404 on second righting piece 4, roof 404 and spacing boss 103 butt, right piece 4 and play spacing effect through spacing boss 103 to the second, guarantee the stability of being connected between second righting piece 4 and the first righting piece 1, prevent that second righting piece 4 and first righting piece 1 from taking place relative movement, further guaranteed that second righting piece 4 and the stable use under the first righting piece 1 cooperation state.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims

1. The utility model provides a device is right to beam-pumping unit, during the clearance between beam-pumping unit base and the basic support position was located to the pad, its characterized in that, the device is right to beam-pumping unit is including right first righting (1) that the beam-pumping unit was right and right first righting (1) carries out fixed ring (2) fixed, wherein:

the first righting piece (1) is of a plate-shaped structure arranged along the horizontal direction, a plurality of first anti-retreating bosses (101) are arranged on the top surface of the first righting piece (1), the fixing ring (2) is fixed on the first righting piece (1), and bolts (3) are connected between the fixing ring (2) and the foundation supporting positions.

2. The beam-pumping unit centralizer of claim 1, wherein the bottom surface of the first centralizer (1) is a plane parallel to a horizontal plane, and the top surface of the first centralizer (1) is an inclined surface forming an included angle with the horizontal plane.

3. The beam-pumping unit centralizer of claim 2, wherein the angle between the top surface of the first centralizer (1) and the bottom surface of the first centralizer (1) is from 5 ° to 15 °.

4. The oil pumping unit centralizer according to claim 2, wherein the first anti-back bosses (101) are of an elongated structure extending along the width direction of the first centralizing part (1), and the first anti-back bosses (101) are continuously arranged along the length direction of the first centralizing part (1) so that the longitudinal section of each first anti-back boss (101) is in a sawtooth shape.

5. The pumping unit centralizer of claim 4, wherein the first anti-back boss (101) comprises a first vertical surface (1011) and a first inclined surface (1012), the bottom of the first vertical surface (1011) and the bottom of the first inclined surface (1012) are both connected with the top surface of the first centralizer (1), the top of the first vertical surface (1011) is connected with the top of the first inclined surface (1012), and the first inclined surface (1012) is inclined to the same direction as the top surface of the first centralizer (1).

6. The device according to claim 1, characterized in that one end of the first centering member (1) is provided with a first guide shoe (102), and the fixing ring (2) is located at the other end of the first centering member (1) opposite to the first guide shoe (102).

7. The oil pumping unit centering device of claim 1, further comprising a second centering member (4) cooperating with the first centering member (1) to center the oil pumping unit, wherein the second centering member (4) is disposed on a top surface of the first centering member (1), a plurality of second anti-back bosses (401) are disposed on a top surface of the second centering member (4), a plurality of third anti-back bosses (402) cooperating with the first anti-back bosses (101) are disposed on a bottom surface of the second centering member (4), and each of the third anti-back bosses (402) is engaged with each of the first anti-back bosses (101).

8. The pumping unit centralizer according to claim 7, wherein the second centralizing part (4) is a flat plate-shaped structure, the second centralizing part (4) is parallel to the top surface of the first centralizing part (1), the second anti-back bosses (401) and the third anti-back bosses (402) are both long strip-shaped structures extending along the width direction of the second centralizing part (4), and the second anti-back bosses (401) and the third anti-back bosses (402) are both continuously arranged along the length direction of the second centralizing part (4), so that the longitudinal sections of the second anti-back bosses (401) and the third anti-back bosses (402) are both zigzag.

9. The well pumping unit centralizer of claim 8, wherein the second anti-back boss (401) comprises a second vertical surface (4011) and a second inclined surface (4012), wherein the bottom of the second vertical surface (4011) and the bottom of the second inclined surface (4012) are connected with the top surface of the second centralizer (4), the top of the second vertical surface (4011) is connected with the top of the second inclined surface (4012), and the second inclined surface (4012) is inclined to the same direction as the top surface of the first centralizer (1).

10. The beam-pumping unit centralizer according to claim 7, characterized in that one end of the second centralizer (4) is provided with a second guide shoe (403).

11. The pumping unit centralizer of claim 10, wherein a limit boss (103) is arranged at one end, close to the fixing ring (2), of the top surface of the first centralizer (1), a top plate (404) is arranged at the other end, opposite to the second guide shoe (403), of the second centralizer (4), one end of the top plate (404) is connected with the second centralizer (4), and the other end of the top plate (404) is abutted to the limit boss (103).

12. The beam-pumping unit centralizer of claim 7, wherein the first centralizer (1), the second centralizer (4), and the retainer ring (2) are made of steel material.