Puller, jaws and method of using the puller

Abstract

Provided are a puller, a clamping claw, and a method for using the puller. The puller includes a first clamping claw and a second clamping claw arranged opposite to each other. The first clamping claw includes a first pulling portion, a first limiting portion, and a first connecting portion connecting the first pulling portion and the first limiting portion, the first limiting portion includes a first main body, a first notch portion, and a second notch portion, the second clamping claw includes a second pulling portion, a second limiting portion, and a second connecting portion connecting the second pulling portion and the second limiting portion, the second limiting portion includes a second main body, a third notch portion, and a fourth notch portion, the first main body, the first notch portion, the second notch portion, the fourth notch portion, the third notch portion, and the second main body are sequentially arranged in the first direction, the size of the second notch portion in the second direction is larger than the size of the first notch portion in the second direction, and the size of the fourth notch portion in the second direction is larger than the size of the third notch portion in the second direction.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to a puller, a clamping jaw, and a method of using the puller. Background Art

[0002] In oilfield and shale gas operations, especially cementing, fracturing, acidizing and other operations, as fracturing conditions become increasingly severe and pressures become higher, the pressure and impact load on the valve seat (also known as the "valve seat") in the hydraulic end of the plunger pump continues to increase. Because the valve seat and the valve box are interference fit, the valve seat is tightly pressed into the valve box, which makes it extremely difficult to disassemble and replace the valve seat, reducing operating efficiency. Summary of the invention

[0003] The embodiments of the present disclosure relate to a puller, a clamping claw and a method for using the puller. The puller of the embodiments of the present disclosure is easy to disassemble and not easy to be damaged.

[0004] An embodiment of the present disclosure provides a puller, comprising a first claw and a second claw arranged opposite to each other. The first claw comprises a first pulling portion, a first limiting portion and a first connecting portion connecting the first pulling portion and the first limiting portion, the first limiting portion comprises a first main body, a first notch portion and a second notch portion, the first notch portion is located on a side of the first main body close to the second claw in the first direction, the second notch portion is located on a side of the first notch portion away from the first main body in the first direction, the size of the second notch portion in the second direction is larger than the size of the first notch portion in the second direction, the second direction intersects with the first direction, the second claw comprises a second pulling portion, a second limiting portion and a second connecting portion connecting the second pulling portion and the second limiting portion, the second limiting portion comprises a second main body, a third notch portion and a fourth notch portion, the The third notch portion is located on a side of the second main body portion close to the first claw in the first direction, the fourth notch portion is located on a side of the third notch portion away from the second main body portion in the first direction, the size of the fourth notch portion in the second direction is larger than the size of the third notch portion in the second direction, the size of the first limiting portion in the first direction and the size of the first pulling portion in the first direction are both larger than the size of the first connecting portion in the first direction, the size of the second limiting portion in the first direction and the size of the second pulling portion in the first direction are both larger than the size of the second connecting portion in the first direction, and the size of the second pulling portion in the second direction is less than or equal to the size of the second notch in the second direction.

[0005] According to an embodiment of the present disclosure, the first clamping claw and the second clamping claw have the same shape and size, and the size of the first pulling portion in the second direction is less than or equal to the size of the fourth notch in the second direction.

[0006] According to an embodiment of the present disclosure, the first limiting portion includes a first surface connected to the first connecting portion and a second surface arranged opposite to the first surface.

[0007] The orthographic projection of the first main body on the first reference plane where the second surface is located, the orthographic projection of the first notch on the first reference plane, and the orthographic projection of the second notch on the first reference plane combine to form a first semicircle, the orthographic projection of the first main body on the first reference plane overlaps with the arc edge of the first semicircle, and the orthographic projection of the second notch on the first reference plane overlaps with the straight line of the first semicircle.

[0008] According to an embodiment of the present disclosure, the second limiting portion includes a third surface connected to the second connecting portion and a fourth surface arranged opposite to the third surface.

[0009] The orthographic projection of the second main body on the third reference plane where the third surface is located, the orthographic projection of the third notch on the second reference plane, and the orthographic projection of the fourth notch on the second reference plane are combined to form a second semicircle, the orthographic projection of the second main body on the second reference plane overlaps with the arcuate edge of the second semicircle, and the orthographic projection of the fourth notch on the second reference plane overlaps with the straight line of the second semicircle. According to an embodiment of the present disclosure, the first semicircle and the second semicircle are configured to be combined into a full circle.

[0010] According to an embodiment of the present disclosure, the orthographic projection of the second notch portion on the first reference plane is a first rectangle, and the orthographic projection of the first notch portion on the first reference plane is a shape formed by the first arc and the long side of the first rectangle.

[0011] According to an embodiment of the present disclosure, the orthographic projection of the fourth notch portion on the second reference plane is a second rectangle, and the orthographic projection of the third notch portion on the second reference plane is a shape formed by the second arc shape and the long side of the second rectangle.

[0012] According to an embodiment of the present disclosure, a dimension of the first pulling portion in the third direction is larger than 1 / 2 of a dimension of the first connecting portion in the third direction.

[0013] According to an embodiment of the present disclosure, a dimension of the second pulling portion in the third direction is greater than 1 / 2 of a dimension of the second connecting portion in the third direction.

[0014] According to an embodiment of the present disclosure, the first connecting portion includes a first inner side wall and a first outer side wall, the first inner side wall is connected to a surface of the first main body portion close to the first notch portion, and the first outer side wall is arranged opposite to the first inner side wall.

[0015] According to an embodiment of the present disclosure, the second connecting portion includes a second inner wall and a second outer wall, the second outer wall is connected to a surface of the second main body portion close to the third notch portion, and the second outer wall is arranged opposite to the second inner wall.

[0016] According to an embodiment of the present disclosure, the first pulling portion includes a third inner side wall and a third outer side wall, the third inner side wall is connected to the first inner side wall, the third inner side wall is arranged opposite to the third outer side wall, the third inner side wall is provided with a first thread, and the first thread extends from the third inner side wall to the first inner side wall.

[0017] According to an embodiment of the present disclosure, the second pulling portion includes a fourth inner sidewall and a fourth outer sidewall, the fourth inner sidewall is connected to the second inner sidewall, the fourth inner sidewall is provided with a second thread, and the second thread extends from the fourth inner sidewall to the third inner sidewall.

[0018] According to an embodiment of the present disclosure, the specification of the first thread is the same as the specification of the second thread.

[0019] According to an embodiment of the present disclosure, the first outer sidewall includes a first groove.

[0020] According to an embodiment of the present disclosure, the second outer sidewall includes a second groove.

[0021] An embodiment of the present disclosure provides a claw, comprising a pulling portion, a limiting portion, and a connecting portion connecting the pulling portion and the limiting portion, wherein the limiting portion comprises a main body portion, a first notch portion, and a second notch portion, wherein the main body portion, the first notch portion, and the second notch portion are sequentially arranged in a first direction, wherein a dimension of the second notch portion in a second direction is greater than a dimension of the first notch portion in the second direction, and the second direction intersects with the first direction,

[0022] The size of the limiting portion in the first direction and the size of the pulling portion in the first direction are both larger than the size of the connecting portion in the first direction, and the size of the pulling portion in the second direction is smaller than or equal to the size of the second notch in the second direction.

[0023] According to an embodiment of the present disclosure, the limiting portion includes a first surface connected to the connecting portion and a second surface arranged opposite to the first surface, the orthographic projection of the main body portion on the reference plane where the second surface is located, the orthographic projection of the first notch portion on the reference plane, and the orthographic projection of the second notch portion on the reference plane are combined to form a semicircle, the orthographic projection of the main body portion on the reference plane overlaps with the arc edge of the semicircle, and the orthographic projection of the second notch portion on the reference plane overlaps with the straight line of the semicircle.

[0024] According to an embodiment of the present disclosure, the orthographic projection of the second notch portion on the reference plane is a rectangle, and the orthographic projection of the first notch portion on the reference plane is a shape formed by an arc and a long side of the rectangle.

[0025] According to an embodiment of the present disclosure, a dimension of the pulling portion in the third direction is larger than 1 / 2 of a dimension of the connecting portion in the third direction.

[0026] According to an embodiment of the present disclosure, the connecting portion includes a first inner side wall and a first outer side wall, the first outer side wall is connected to a surface of the main body portion close to the first notch portion, and the first outer side wall is arranged opposite to the first inner side wall.

[0027] According to an embodiment of the present disclosure, the drawing portion includes a third inner side wall and a third outer side wall, the third inner side wall is connected to the first inner side wall, the third inner side wall is arranged opposite to the third outer side wall, the third inner side wall is provided with a thread, and the thread extends from the third inner side wall to the first inner side wall.

[0028] The embodiment of the present disclosure provides a method for using the above-mentioned puller. The method comprises: placing a first clamping claw into a valve seat and pushing the first clamping claw toward the edge of the valve seat, placing a second clamping claw into the valve seat through a second notch and pushing the second clamping claw toward the edge of the valve seat, combining the first clamping claw and the second clamping claw positioning part, wherein the first limiting part and the second limiting part are respectively in contact with the upper end surface of the valve seat.

[0029] According to an embodiment of the present disclosure, the method also includes screwing one end of the lead screw into the puller through the first notch, the second notch, the third notch and the fourth notch, so that one end of the lead screw is connected to the first pulling part and the second pulling part, and the hydraulic drive device is inserted into the other end of the lead screw and fixed by a nut.

[0030] According to an embodiment of the present disclosure, the method further comprises controlling the rotation of the lead screw by a hydraulic drive device, so that the first drawing part and the second drawing part drive the valve seat to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the examples of the present disclosure, the drawings of the examples will be briefly introduced below. Obviously, the drawings in the following description only involve some examples of the present disclosure, rather than limiting the present disclosure.

[0032] Figure 1 A longitudinal cross-sectional schematic diagram showing an example of a puller installed on a valve seat;

[0033] Figure 2 A three-dimensional schematic diagram illustrating an example puller;

[0034] Figure 3 A schematic diagram showing a combination of a first clamping jaw and a second clamping jaw according to an embodiment of the present disclosure;

[0035] Figure 4 Another perspective schematic diagram illustrating a combination of a first jaw and a second jaw according to an embodiment of the present disclosure;

[0036] Figure 5 A perspective schematic diagram illustrating a process of combining a first clamping jaw and a second clamping jaw according to an embodiment of the present disclosure;

[0037] Figure 6 A schematic longitudinal section diagram illustrating a combination of a first jaw and a second jaw according to an embodiment of the present disclosure;

[0038] Figure 7a A schematic projection diagram illustrating a first clamping jaw and a second clamping jaw according to an embodiment of the present disclosure;

[0039] Figure 7b Another schematic projection diagram illustrating a first clamping jaw and a second clamping jaw according to an embodiment of the present disclosure;

[0040] Figure 8 A schematic longitudinal section diagram illustrating a jaw according to an embodiment of the present disclosure;

[0041] Figure 9a A schematic projection diagram illustrating a clamping jaw according to an embodiment of the present disclosure;

[0042] Figure 9b Another schematic projection diagram illustrating a clamping jaw according to an embodiment of the present disclosure;

[0043] Fig.10 A longitudinal cross-sectional schematic diagram illustrating a claw attached to a valve seat according to an embodiment of the present disclosure;

[0044] Fig.11 A three-dimensional schematic diagram illustrating two claws limited on a valve seat according to an embodiment of the present disclosure;

[0045] Fig.12 a flow chart illustrating a method of using a puller according to an embodiment of the present disclosure; and

[0046] Fig.13 A schematic longitudinal section diagram illustrating a puller according to an embodiment of the present disclosure installed on a valve seat. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the examples of the present disclosure clearer, the technical solution of the examples of the present disclosure will be clearly and completely described below in conjunction with the drawings of the examples of the present disclosure. Obviously, the described examples are part of the examples of the present disclosure, not all of the examples. Based on the described examples of the present disclosure, all other examples obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0048] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] Figure 1 A longitudinal cross-sectional view showing an example of a puller mounted on a valve seat, and Figure 2 A perspective schematic diagram of an example puller.

[0050] like Figure 1 As shown, the pulling tool for disassembling the valve seat includes: a puller 1, a hydraulic drive device 2, a lead screw 3 and a nut 4. Figure 2 As shown, the puller consists of two parts: a claw 11 and a clamp 12. The claw 11 is split and includes two sub-claws. The opposite surfaces of the two sub-claws are provided with threads. The clamp 12 is used to hold the two sub-claws together. When in use, close the puller 1 and put it into the valve seat, and then screw the screw 3 into the thread of the claw of the puller. During the process of screwing the screw in, the two sub-claws in the puller are continuously opened, so that the flange 111 of the sub-claw of the puller is clamped on the lower end surface of the valve seat 5. The hydraulic drive device 2 pulls the screw upward, thereby driving the valve seat 5 to be pulled out of the valve box 6.

[0051] The inventor of the present application has found that when using the above-mentioned pulling tool, there are the following disadvantages or shortcomings:

[0052] 1. The jaws of the puller are composed of two parts, and there is a large gap between the two parts, which cannot form a full circle. Therefore, when in use, the threads inside the jaws may become stuck, making it difficult to screw the screw in. During the operation, if the screw is difficult to screw in, the number of threads that mesh between the screw and the puller is very small. At this time, pulling the valve seat will cause serious damage to the threads inside the screw and the puller and cannot continue to be used.

[0053] 2. Since the inner diameter of the inner hole of the valve seat is fixed, the flange at the lower end of the puller's claw cannot be thickened. This is because if the flange is thickened, the puller cannot be placed in the inner hole of the valve seat. When the claw of the above structure pulls the valve seat, the flange is prone to breakage, resulting in damage to the tool, so the service life of the puller is short.

[0054] The embodiments of the present disclosure provide a puller, a clamping claw, and a method for using the puller. The puller includes two split clamping claws arranged opposite to each other, each clamping claw includes a pulling portion, a limiting portion, and a connecting portion for connecting the pulling portion and the limiting portion. The pulling portion and the limiting portion of each clamping claw have a size in the first direction that is larger than the size of the connecting portion. The limiting portion of each clamping claw includes a notch, and the size of the notch in the second direction is larger than the size of the pulling portion in the second direction. The puller and the clamping claw of the present disclosure can prevent the thread thereof from being damaged and prevent the puller from breaking.

[0055] The puller, the clamping claw and the method for using the puller provided in the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0056] An embodiment of the present disclosure provides a puller. Figure 3 A three-dimensional schematic diagram illustrating a combination of a first jaw and a second jaw of a puller according to an embodiment of the present disclosure, Figure 4 Another perspective schematic diagram illustrating a combination of a first jaw and a second jaw of a puller according to an embodiment of the present disclosure, Figure 5 A three-dimensional schematic diagram illustrating the assembly process of the first jaw and the second jaw of the puller according to an embodiment of the present disclosure, Figure 6 A schematic longitudinal section diagram illustrating a first jaw and a second jaw according to an embodiment of the present disclosure is shown. Figure 7a A schematic projection diagram of a first clamping jaw and a second clamping jaw according to an embodiment of the present disclosure is illustrated, and Figure 7b Another projection schematic diagram of the first jaw and the second jaw according to an embodiment of the present disclosure is illustrated.

[0057] like Figure 3 and Figure 4As shown, the puller 7 of the embodiment of the present application includes a first claw 71 and a second claw 72 arranged opposite to each other. The first claw 71 includes a first pulling portion 711, a first limiting portion 712 and a first connecting portion 713 connecting the first pulling portion 711 and the first limiting portion 712. The first limiting portion 712 includes a first main body portion 712a, a first notch portion 712b and a second notch portion 712c. The first notch portion 712b is located on a side of the first main body portion 712a close to the second claw 72 in the first direction x, and the second notch portion 712c is located on a side of the first notch portion 712b away from the first main body portion 712a in the first direction x. As shown in FIG. Figure 3 As shown, the dimension of the second notch portion 712c in the second direction y is greater than the dimension of the first notch portion 712b in the second direction y, and the second direction y intersects with the first direction x. For example, the first direction x may be perpendicular to the second direction y.

[0058] like Figure 3 and Figure 4 As shown, the second claw 72 includes a second pulling portion 721, a second limiting portion 722 and a second connecting portion 723 connecting the second pulling portion 721 and the second limiting portion 722. The second limiting portion 722 includes a second main body portion 722a, a third notch portion 722b and a fourth notch portion 722c. The third notch portion 722b is located on a side of the second main body portion 722a close to the first claw 71 in the first direction x. The fourth notch portion 722c is located on a side of the third notch portion 722b away from the second main body portion 722a in the first direction x, and the size of the fourth notch portion 722c in the second direction y is greater than the size of the third notch portion 722b in the second direction y.

[0059] like Figure 6 As shown, the size of the first limiting portion 712 in the first direction x and the size of the first pulling portion 711 in the first direction x are both larger than the size of the first connecting portion 713 in the first direction x. The size of the second limiting portion 722 in the first direction x and the size of the second pulling portion 721 in the first direction are both larger than the size of the second connecting portion 723 in the first direction x. Figure 5 , Figure 7a and Figure 7b, the size of the second pulling portion 721 in the second direction y is less than or equal to the size of the second notch portion 712c in the second direction y. In the puller provided in the embodiment of the present disclosure, because the size of the second pulling portion in the second direction is less than or equal to the size of the second notch portion in the second direction, the first claw can be first placed into the inner hole of the valve seat to be taken out, and then the second claw can be placed into the inner hole of the valve seat to be taken out through the above-mentioned second notch portion, and then the first limiting portion of the first claw and the second limiting portion of the second claw are aligned, and finally the lead screw is extended between the first claw and the second claw to open the first pulling portion of the first claw and the second pulling portion of the second claw and engage through the thread, and finally the valve seat to be taken out is taken out by the upward movement of the lead screw. It can be seen that the puller provided in the embodiment of the present disclosure has at least the following advantages:

[0060] (1) The puller does not require a clamp, which is convenient for operation and reduces costs;

[0061] (2) The puller does not require a clamp, and can be limited by the first limiting portion of the first clamping claw and the second limiting portion of the second clamping claw fitting against the upper end surface of the valve seat, thereby ensuring that the thread will not be randomly buckled;

[0062] (3) Since the dimension of the second drawing portion in the second direction is less than or equal to the dimension of the second notch portion in the second direction, the second drawing portion can be installed vertically downward and can be made thicker, thereby improving the strength of the second drawing portion, reducing the risk of breakage, and greatly improving the service life.

[0063] Figure 7a The case where the size of the second pulling portion 721 in the second direction y is equal to the size of the second notch portion 712c in the second direction y is shown. In this case, the orthographic projection of the portion of the second pulling portion 721 along the second direction y in the plane defined by the first direction x and the second direction y coincides with the orthographic projection of the short side 722c3 of the fourth notch portion 722c in the plane defined by the first direction x and the second direction y, and the short side 712c3 of the second notch portion 712c and the short side of the fourth notch portion 722c are aligned in the plane. Figure 7bThe case where the size of the second pulling portion 721 in the second direction y is smaller than the size of the second notch portion 712c in the second direction y is shown. In this case, the orthographic projection of the portion of the second pulling portion 721 along the second direction y in the plane defined by the first direction x and the second direction y is within the orthographic projection of the fourth notch portion 722c in the plane defined by the first direction x and the second direction y, and the short side 712c3 of the second notch portion 712c and the short side 722c3 of the fourth notch portion 722c are aligned in the plane. According to an embodiment of the present application, the puller of the present application includes two claws. The first claw and the second claw can be used in pairs, and each claw includes three parts, the upper end is a limiting part, the middle is a connecting part, and the lower end is a pulling part. The two claws of the puller of this embodiment are split. Because the sizes of the first limiting portion and the first pulling portion in the first direction are both larger than the size of the first connecting portion in the first direction, and the sizes of the second limiting portion and the second pulling portion in the first direction are both larger than the size of the second connecting portion in the first direction, when the puller is placed in the inner hole of the valve seat to be pulled, the valve seat can be sleeved on the first connecting portion and the second connecting portion, and the first limiting portion and the second limiting portion can limit the puller on the valve seat. Figure 5 As shown. Because the size of the second pulling portion of the puller of the embodiment of the present application in the second direction is less than or equal to the size of the second notch in the second direction, when the first claw is placed in the inner hole of the valve seat, the second claw can be placed in the inner hole of the valve seat through the second notch of the first claw. In this way, the first claw and the second claw are split and are placed in the valve seat respectively. The puller of the embodiment of the present application does not require a clamp, and the first claw and the second claw are easy to disassemble and assemble and have low cost. The puller of the present application can be used for the valve seat in the hydraulic end of the plunger pump.

[0064] In some embodiments, Figure 5 As shown, the dimensions of the second connecting portion 723 and the second pulling portion 721 in the second direction y are both smaller than or equal to the dimension of the second notch portion 712 c in the second direction y.

[0065] In some embodiments, Figure 3 and Figure 4 As shown, the size of the first limiting portion 712 in the second direction y is greater than the size of the first connecting portion 713 in the second direction y, and the size of the second limiting portion 722 in the second direction y is greater than the size of the second connecting portion 723 in the second direction y.

[0066] In some embodiments, for example, Figure 7aAs shown, the first direction x may be perpendicular to the direction of the long side 712c1 of the second notch portion 712c. The second direction y may be perpendicular to the first direction x. The first limiting portion 712 and the second limiting portion 722 extend on a plane defined by the first direction x and the second direction y. For example, the first limiting portion 712 extends in a direction away from the second claw 72, and the second limiting portion 722 extends in a direction away from the first claw 71.

[0067] In some embodiments, the first claw 71 and the second claw 72 have the same shape and size, and the size of the first pulling portion 711 in the second direction y is less than or equal to the size of the fourth notch in the second direction y.

[0068] Figure 7a The case where the size of the first pulling portion 711 in the second direction y is equal to the size of the fourth notch portion 722c in the second direction y is shown. In this case, the orthographic projection of the portion of the first pulling portion 711 along the second direction y in the plane defined by the first direction x and the second direction y coincides with the orthographic projection of the short side 712c3 of the second notch portion 712c in the plane defined by the first direction x and the second direction y, and the short side 722c3 of the fourth notch portion 722c is aligned with the short side of the second notch portion 712c in the plane. Figure 7b The figure shows a case where the size of the first pulling portion 711 in the second direction y is smaller than the size of the fourth notch portion 722c in the second direction y. In this case, the orthographic projection of the portion of the first pulling portion 711 along the second direction y in the plane defined by the first direction x and the second direction y is within the orthographic projection of the second notch portion 712c in the plane defined by the first direction x and the second direction y, and the short side 722c3 of the fourth notch portion 722c and the short side 712c3 of the second notch portion 712c are aligned in the plane.

[0069] According to an embodiment of the present application, the first claw and the second claw have the same shape and size. In this way, when the puller of the embodiment of the present application pulls the valve seat, the two claws of the puller of the embodiment of the present application are evenly stressed and not easily damaged, and the pulled valve seat is also evenly stressed and not easily damaged. According to an embodiment of the present application, as described above, because the size of the second pulling part in the second direction is less than or equal to the size of the second notch part in the second direction, the first claw can be first placed in the inner hole of the valve seat, and then the second claw can be placed in the inner hole of the valve seat through the second notch. Similarly, because the size of the first pulling part in the second direction is less than or equal to the size of the fourth notch in the second direction, the second claw can be first placed in the inner hole of the valve seat, and then the first claw can be placed in the inner hole of the valve seat through the fourth notch. On the other hand, the first claw and the second claw can be replaced with each other, thereby reducing the maintenance cost of the puller.

[0070] In some embodiments, Figure 3 , Figure 4 and Figure 7a As shown, the first limiting portion 712 may include a first surface 712d connected to the first connecting portion 713 and a second surface 712e disposed opposite to the first surface 712d. Figure 7a As shown, the orthographic projection of the first main body portion 712a on the first reference plane (for example, a plane defined by the first direction x and the second direction y) where the second surface 712e is located, the orthographic projection of the first notch portion 712b on the first reference plane, and the orthographic projection of the second notch portion 712c on the first reference plane are combined to form a first semicircle 714, the orthographic projection of the first main body portion 712a on the first reference plane overlaps with the arcuate edge 714a of the first semicircle 714, and the orthographic projection of the second notch portion 712c on the first reference plane overlaps with the straight line 714b of the first semicircle 714.

[0071] In some embodiments, Figure 3 , Figure 4 and Figure 7a As shown, the second limiting portion 722 may include a third surface 722d connected to the second connecting portion 723 and a fourth surface 722e arranged opposite to the third surface 722d, the orthographic projection of the second main body portion 722a on a third reference plane (for example, a plane defined by the first direction x and the second direction y) where the third surface 722d is located, the orthographic projection of the third notch portion 722b on the second reference plane, and the orthographic projection of the fourth notch portion 722c on the second reference plane are combined to form a second semicircle 724, the orthographic projection of the second main body portion 722a on the second reference plane overlaps with the arcuate edge 724a of the second semicircle 724, and the orthographic projection of the fourth notch portion 722c on the second reference plane overlaps with the straight line 724b of the second semicircle 724.

[0072] In some embodiments, Figure 7b As shown, the first semicircle 714 and the second semicircle 724 are configured to be combined into a full circle.

[0073] According to the embodiment of the present application, because the lead screw needs to be threadedly connected with the threads of the first jaw and the second jaw through the space formed by the first notch portion, the second notch portion of the first jaw of the present application and the third notch portion and the fourth notch portion of the second jaw of the present application, when the first jaw is combined with the second jaw, that is, when the first semicircle 714 and the second semicircle 724 form a full circle, there may be a gap 8 between the limiting portion of the first jaw and the limiting portion of the second jaw, such as Figure 3 , Figure 7a and Figure 7b shown.

[0074] In some embodiments, for example, Figure 6 As shown, the second surface 712e and the fourth surface 722e can be located in the same plane. That is, the upper ends of the first jaw and the second jaw are aligned, that is, the first reference plane and the second reference plane can be located in the same plane (for example, a plane defined by the first direction x and the second direction y).

[0075] In some embodiments, for example, Figure 3 , Figure 4 and Figure 6 As shown, when the first claw and the second claw are combined, the first limiting portion, the first connecting portion and the first pulling portion of the first claw are respectively aligned with the second limiting portion, the second connecting portion and the second pulling portion of the second claw.

[0076] In some embodiments, for example, Figure 5 and 6 As shown, the angle between the first surface 712d and the first reference plane can be the same as the angle between the upper end surface 51 of the valve seat (the upper end surface can be a conical surface) and the first reference plane, and the angle between the third surface 722d and the second reference plane can be the same as the angle between the upper end surface 51 of the valve seat and the second reference plane. In this way, the puller can be limited by fitting the first surface and the third surface to the upper end surface of the valve seat respectively.

[0077] According to the implementation example of the present application, the orthographic projections of the first main body, the first notch and the third notch can form a first semicircle, the orthographic projections of the second main body, the third notch and the fourth notch can form a second semicircle, and the first semicircle and the second semicircle can form a full circle. In this way, when the first half jaw and the second half jaw of the present application are combined, the first surface of the first limiting portion of the first jaw and the third surface of the second limiting portion of the second jaw are abutted against the upper end surface of the valve seat and pieced together into a full circle during the process of placing the first jaw and the second jaw into the inner hole of the valve seat, so as to realize the limiting effect of the first limiting portion and the second limiting portion. Therefore, the first jaw and the second jaw of the embodiment of the present application do not need an additional clamp, which at least simplifies the manufacturing process of the puller and reduces the cost.

[0078] In some embodiments, Figure 7a As shown, the orthographic projection of the second notch portion 712c on the first reference plane is a first rectangle, and the orthographic projection of the first notch portion 712b on the first reference plane is a shape formed by the first arc shape 712b1 and the long side 712c2 of the first rectangle. Figure 7a and 7b The dotted lines in FIG. 5 are for clearly illustrating the shapes of the first notch portion and the second notch portion.

[0079] In some embodiments, the orthographic projection of the fourth notch portion 722c on the second reference plane is a second rectangle, and the orthographic projection of the third notch portion 722b on the second reference plane is a shape formed by the second arc shape 722b1 and the long side 722c2 of the second rectangle. Figure 7a and Figure 7b The dotted lines in FIG. 5 are for clearly illustrating the shapes of the third and fourth notches.

[0080] According to an embodiment of the present application, the space formed by the first notch portion, the second notch portion, the third notch portion and the fourth notch portion allows the lead screw to pass through to be threadedly connected with the threads of the first drawing portion and the second drawing portion. The circle formed by the first arc of the first notch portion and the second arc of the third notch portion of the embodiment of the present application can match the cross section of the lead screw. For example, the radius of the circle formed by the first arc of the first notch portion and the second arc of the third notch portion is greater than or equal to the radius of the cross section of the lead screw. For example, the shape of the second notch portion and the fourth notch portion of the embodiment of the present application can be rectangular, so that the second drawing portion of the second claw of the second notch portion whose size is equal to or smaller than the second notch portion in the second direction y can pass through the second notch portion when the first claw is set in the inner hole of the valve seat, thereby combining with the first claw, or the first drawing portion of the first claw of the fourth notch portion whose size is equal to or smaller than the first notch portion in the second direction can pass through the fourth notch portion when the second claw is set in the content of the valve seat, thereby combining with the second claw. The rectangular shape is easy to be processed in the manufacturing process, so it is easy to control the size of the second notch portion and the fourth notch portion in the second direction, so that the puller of the present application is simpler and easier to implement in terms of process.

[0081] According to an embodiment of the present application, the second notch portion and the fourth notch portion may be in the shape of a first rectangle and a second rectangle, and the two may be of equal size. For example, the long side 712c1 of the first rectangle and the long side 722c1 of the second rectangle may be of the same length. In this way, the first limiting portion and the second limiting portion may be formed into a full circle by aligning the short side 712c3 of the first rectangle and the short side 722c3 of the second rectangle in a plane defined by the first direction x and the second direction y, thereby achieving the limiting of the first limiting portion and the second limiting portion.

[0082] In some embodiments, Figure 6 As shown, the first connection portion 713 includes a first inner wall 713c and a first outer wall 713a, the first inner wall 713c is connected to a surface 712f of the first main body portion 712a close to the first notch portion 712b, and the first outer wall 713a is arranged opposite to the first inner wall 713c.

[0083] According to the embodiments of the present application, Figure 6As shown, the second connection portion 723 includes a second inner wall 723c and a second outer wall 723a, the second inner wall 723c is connected to a surface 722f of the second main body portion 722a close to the third notch portion 722b, and the second outer wall 723a is arranged opposite to the second inner wall 723c.

[0084] In some embodiments, Figure 6 As shown, the first pulling portion 711 includes a third inner wall 711a and a third outer wall 711c, the third inner wall 711a is connected to the first inner wall 713c, the third inner wall 711a and the third outer wall 711c are arranged opposite to each other, the third inner wall 711a is provided with a first thread 711b, and the first thread 711b extends from the third inner wall 711a to the first inner wall 713c.

[0085] In some embodiments, Figure 6 The second pulling portion 721 includes a fourth inner wall 721a and a fourth outer wall 721c, the fourth inner wall 721a is connected to the second inner wall 723c, the fourth inner wall 721a is provided with a second thread 721b, and the second thread 721b extends from the fourth inner wall 721a to the second inner wall 723c.

[0086] In some embodiments, for example, the first inner sidewall 713c and the second inner sidewall 723c are perpendicular to the second surface 712e, and the first outer sidewall 713a and the second outer sidewall 723a are perpendicular to the second surface 712e. For example, the third inner sidewall 723c and the fourth inner sidewall 721a are perpendicular to the fourth surface 722e, and the third outer sidewall 711c and the fourth outer sidewall 721c are perpendicular to the second surface 712e. For example, the second surface 712e and the fourth surface 722e both coincide with the plane defined by the first direction x and the second direction y.

[0087] In some embodiments, for example, the third outer side wall 711c is further away from the second claw 72 than the first outer side wall 713a, and the upper end of the third outer side wall 711c is connected to the lower end of the first outer side wall 713a to form a step-like structure, so that the valve seat is subjected to force when the valve seat is pulled using a puller. For example, the fourth outer side wall 721c is further away from the first claw 71 than the second outer side wall 723a, and the upper end of the fourth outer side wall 721c is connected to the lower end of the second outer side wall 723a to form a step-like structure, so that the valve seat is subjected to force when the valve seat is pulled using a puller.

[0088] In some embodiments, the specifications of the first thread 711b and the second thread 721b are the same. For example, the nominal diameter, number of threads, pitch and lead, and hand direction of the first thread and the second thread are the same.

[0089] According to the embodiments of the present application, the first thread and the second thread of the embodiments of the present application have the same specifications, and the threaded screw can be threadedly connected to the first claw and the second claw.

[0090] According to the embodiments of the present application, since the puller of the present application does not require a clamp, but is limited by the fit between the limiting portion and the upper end surface of the valve seat, the gap between the first claw and the second claw is small, and the number of engagements between the thread of the screw and the thread of the claw is large, thus ensuring that the situation of random threading is avoided.

[0091] In some embodiments, Figure 4 and Figure 6 As shown, the first outer side wall 713a includes a first groove 713b.

[0092] In some embodiments, Figure 4 and Figure 6 As shown, the second outer side wall 723a includes a second groove 723b.

[0093] In some embodiments, for example, Figure 4 and 6 As shown, the first groove 713b can be connected to the first surface 712d, and the second groove 723b can be connected to the third surface 722d. Figure 4 and Figure 6 As shown, the first groove 713b may extend parallel to the second surface 712e, and the second groove 723b may extend along the fourth surface 722e.

[0094] According to the embodiment of the present application, because the first connecting part is provided with a first groove and the second connecting part is provided with a second groove, when the inner wall of the valve seat is damaged or has burrs, the first groove and the second groove will not interfere with the burrs, so that the puller for the valve seat can be smoothly installed and pulled.

[0095] According to the embodiments of the present application, Figure 6 As shown, the size of the first pulling portion 711 in the third direction z is larger than 1 / 2 of the size of the first connecting portion 713 in the third direction z, and the size of the second pulling portion 721 in the third direction z is larger than 1 / 2 of the size of the second connecting portion 723 in the third direction z.

[0096] According to an embodiment of the present application, the first claw and the second claw of the puller of the present application are limited in the inner hole of the valve seat by the first limiting part and the second limiting part, and no additional clamp is required. The first claw and the second claw are respectively placed in the inner hole of the valve seat. In this way, the first pulling part of the first claw and the second pulling part of the second claw of the present application can be set to be thicker and the first thread and the second thread are respectively set in the first pulling part and the second pulling part, so that when the puller is used for pulling, the force position is transferred to the pulling part, ensuring that the pulling part of the claw will not break during pulling. In addition, because the pulling part of the present application can be thickened, the service life of the puller of the present application is improved.

[0097] An embodiment of the present application provides a claw. Figure 8 A longitudinal cross-sectional view illustrating a claw according to an embodiment of the present application, Figure 9a A projection diagram of a jaw according to an embodiment of the present disclosure on a reference plane is illustrated, and Figure 9b Another projection diagram of the jaws according to an embodiment of the present disclosure on the reference plane is illustrated.

[0098] The embodiment of the present disclosure provides a claw. Figure 8 As shown, the claw includes a first pulling portion 711, a first limiting portion 712, and a first connecting portion 713 connecting the first pulling portion 711 and the first limiting portion 712. Figure 9a As shown, the first position limiting portion 712 includes a first main body portion 712a, a first notch portion 712b and a second notch portion 712c. The first main body portion 712a, the first notch portion 712b and the second notch portion 712c are sequentially arranged in the first direction x. The size of the second notch portion 712c in the second direction y is greater than the size of the first notch portion 712b in the second direction y. The second direction y intersects with the first direction y. For example, the second direction y is perpendicular to the first direction x.

[0099] like Figure 8 As shown, the size of the first limiting portion 712 in the first direction x and the size of the first pulling portion 711 in the first direction x are both greater than the size of the first connecting portion 713 in the first direction x. Figure 9a and Figure 9b As shown, the dimension of the first pulling portion 711 in the second direction y is less than or equal to the dimension of the second notch portion 712 c in the second direction y.

[0100] According to an embodiment of the present application, the claw includes three parts, the upper end is a limiting part, the middle is a connecting part, and the lower end is a pulling part. The two claws of the embodiment of the present application can form a puller. Because the size of the limiting part and the pulling part in the first direction is larger than the size of the connecting part in the first direction, when the claw is placed in the inner hole of the valve seat to be pulled, the limiting part can limit the claw on the valve seat. Because the size of the pulling part of the embodiment of the present application in the second direction y is less than or equal to the size of the second notch part 712c in the second direction y, when one claw is placed in the inner hole of the valve seat, the other claw can be placed in the inner hole of the valve seat to be taken out through the second notch of the one claw. Then align the limiting parts of the two claws, and finally extend the lead screw between the two claws to open the pulling parts of the two claws and engage them through threads, and finally remove the valve seat to be taken out by moving the lead screw upward. In this way, the two claws of the embodiment of the present application are respectively placed in the valve seat, and the claws of the embodiment of the present application do not need a clamp, and the two claws are easy to disassemble and assemble and have low cost. In addition, the limiting parts of the two claws are fitted with the upper end surface of the valve seat to limit the position, thereby ensuring that the thread will not be buckled. In addition, since the size of the drawing part in the second direction is less than or equal to the size of the second notch in the second direction, the drawing part can be installed vertically downward, so it can be made thicker, thereby improving the strength of the drawing part, reducing the risk of breakage, and greatly improving the service life.

[0101] Figure 9a The case where the size of the first pulling portion 711 in the second direction y is equal to the size of the second notch portion 712c in the second direction y is shown. In this case, the orthographic projection of the portion of the short side 712c3 of the second notch portion 712c in the second direction on the plane defined by x and y coincides with the orthographic projection of the first pulling portion 711 on the plane. Figure 9b The case where the size of the first pulling portion 711 in the second direction y is smaller than the size of the second notch portion 712c in the second direction y is shown. In this case, the orthographic projection of the portion of the first pulling portion 711 in the second direction y on the plane defined by x and y is within the range of the orthographic projection of the second notch portion 712c on the plane.

[0102] In some embodiments, Figure 8 As shown, the first limiting portion 712 includes a first surface 712d connected to the first connecting portion 713 and a second surface 712e arranged opposite to the first surface 712d. Figure 9a and Figure 9bAs shown, the orthographic projection of the first main body portion 712a on the reference plane (e.g., the plane defined by x and y) where the second surface 712e is located, the orthographic projection of the first notch portion 712b on the reference plane, and the orthographic projection of the second notch portion 712c on the reference plane are combined to form a first semicircle 714. The orthographic projection of the first main body portion 712a on the reference plane overlaps with the arcuate edge 714a of the semicircle, and the orthographic projection of the second notch portion 712c on the reference plane overlaps with the straight line 714b of the semicircle. Figure 9a and Figure 9b The dotted lines in FIG. 5 are for clearly illustrating the shapes of the first notch portion and the second notch portion.

[0103] According to the embodiment of the present application, the orthographic projections of the limiting portion, the first notch portion, and the second notch portion of the clamping claw can form a semicircle. In this way, the limiting portions of the two clamping claws of the embodiment of the present application can form a full circle, so that when the two clamping claws of the embodiment of the present application are combined, the first surface of the limiting portion of one clamping claw and the first surface of the limiting portion of the other clamping claw are abutted against the upper end surface of the valve seat (the upper end surface can be a conical surface) and pieced together into a full circle during the process of placing the two clamping claws into the inner hole of the valve seat, so as to achieve the limiting effect of the two limiting portions. Therefore, when the two clamping claws of the embodiment of the present application are used to pull the valve seat, no additional clamp is required, which at least simplifies the manufacturing process of the clamping claws.

[0104] In some embodiments, Figure 9a As shown, the orthographic projection of the second notch portion 712c on the reference plane is a rectangle, and the orthographic projection of the first notch portion 712b on the reference plane is a shape formed by the arc shape 712b1 and the long side 712c2 of the rectangle.

[0105] According to an embodiment of the present application, when two jaws are combined, the space formed by the first notch portion and the second notch portion of the two jaws allows the lead screw to pass through to be threadedly connected with the threads of the two drawing parts. The circular shape formed by the arc of the first notch portion of the two jaws of the embodiment of the present application can match the cross-section of the lead screw. For example, the radius of the circle formed by the arc of the two first notch portions is greater than or equal to the radius of the cross-section of the lead screw. For example, the shape of the second notch portion of the jaw of the embodiment of the present application can be rectangular, so that another jaw whose limit portion is smaller than the second notch portion of one jaw in the second direction y can pass through the second notch portion when the one jaw is set in the inner hole of the valve seat, thereby combining with the one jaw.

[0106] According to an embodiment of the present application, the shape of the second notch portion can be a first rectangle. In this way, the two limiting portions can be formed into a full circle by aligning the short sides of the two first rectangles of the two claws in a plane defined by the first direction x and the second direction y, thereby achieving the limiting of the two limiting portions in the inner hole of the valve seat.

[0107] In one embodiment, Figure 8 As shown, the first connection portion 713 includes a first inner wall 713c and a first outer wall 713a, the first inner wall 713c is connected to a surface 712f of the first main body portion 712a close to the first notch portion 712b, and the first outer wall 713a is arranged opposite to the first inner wall 713c.

[0108] In some embodiments, Figure 8 As shown, the first pulling portion 711 includes a third inner wall 711a and a third outer wall 711c, the third inner wall 711a is connected to the first inner wall 713c, the third inner wall 711a and the third outer wall 711c are arranged opposite to each other, the third inner wall 711a is provided with a first thread 711b, and the first thread 711b extends from the third inner wall 713a to the first inner wall 713c.

[0109] In some embodiments, for example, Figure 8 As shown, the first inner sidewall 713c and the third inner sidewall 711a are perpendicular to the second surface 712e, and the first outer sidewall 713a and the third outer sidewall 711c are perpendicular to the second surface 712e. For example, the second surface 712e may be in a plane defined by the first direction x and the second direction y.

[0110] In some embodiments, for example, Figure 8 As shown, the third outer wall 711c is farther away from the thread extending from the third inner wall 711a to the first inner wall 713c than the first outer wall 713a, and the upper end of the third outer wall 711c is connected to the lower end of the first outer wall 713a to form a step-like structure, so that the valve seat is subjected to force when the valve seat is pulled using a puller.

[0111] According to an embodiment of the present application, the two clamping claws of the present application form a puller. The puller does not require an additional clamp, and is limited by the limit portion of the clamping claw fitting with the upper end surface of the valve seat. The gap between the two clamping claws is small, and the number of threads of the lead screw and the threads of the clamping claws are large, so as to ensure that the thread is not randomly locked.

[0112] In some embodiments, Figure 8 As shown, the first outer side wall 713a includes a first groove 713b.

[0113] In some embodiments, for example, the first groove 713 b may be connected to the first surface 712 d , and the first groove 713 b may extend parallel to the second surface 712 e .

[0114] According to the embodiment of the present application, because the connecting portion is provided with a groove, when the inner wall of the valve seat is damaged or has burrs, the groove and the burr will not affect each other, so that the claws used for the valve seat can be smoothly installed and pulled.

[0115] In some embodiments, Figure 8 As shown, the dimension of the first pulling portion 711 in the third direction z is greater than 1 / 2 of the dimension of the first connecting portion 713 in the third direction z.

[0116] According to the embodiment of the present application, the two claws of the embodiment of the present application can form a puller, and the limiting parts of the two claws limit the puller in the inner hole of the valve seat, and no additional clamp is required. The two claws of the embodiment of the present application are respectively placed in the inner hole of the valve seat. In this way, the pulling part of the claw of the present application can be set thicker and the threads are respectively set in the pulling part, so that when the puller composed of the two claws is used for pulling, the force position is transferred to the pulling part, ensuring that the pulling part of the claw will not break during pulling.

[0117] The embodiments of the present application provide a method for using the above-mentioned puller. Fig.10 A longitudinal cross-sectional schematic diagram illustrating a claw attached to a valve seat according to an embodiment of the present disclosure; Fig.11 A three-dimensional schematic diagram illustrating two claws limited on a valve seat according to an embodiment of the present disclosure; Fig.12 a flow chart illustrating a method of using a puller according to an embodiment of the present disclosure; and Fig.13 A schematic longitudinal section diagram illustrating a puller according to an embodiment of the present disclosure installed on a valve seat.

[0118] like Fig.12 As shown, the method 100 for using the puller provided in the embodiment of the present application includes: S101, placing the first claw 71 into the inner hole 52 of the valve seat 5 of the valve box 6, and pushing the first claw 71 toward the edge of the valve seat 5, as shown in FIG. Fig.10 and Fig.13 S102, the second claw 72 is placed into the inner hole 52 of the valve seat 5 through the second notch portion 712c, and the second claw 72 is pushed toward the edge of the valve seat 5, as shown Figure 5 As shown; S103, the first claw 71 and the second claw 72 are combined with each other, for example, the first semicircle and the second semicircle are combined into a full circle, wherein the first limiting portion and the second limiting portion are respectively in contact with the upper end surface 51 of the valve seat 5, for example, the first surface 712d and the third surface 722d are respectively in contact with the upper end surface 51 of the valve seat 5, as shown in FIG. Figure 6 and Fig.11 shown.

[0119] In some embodiments, Fig.13The method further includes screwing one end of the lead screw 3 into the puller through the first notch portion 712b, the second notch portion 712c, the third notch portion 722b and the fourth notch portion 722c, so that one end of the lead screw 3 is connected to the first pulling portion and the second pulling portion, for example, the thread at one end of the lead screw 3 is threadedly connected to the first thread and the second thread, and inserting the hydraulic drive device 2 into the other end of the lead screw 3 and fixing it through the nut 4. In some embodiments, the hydraulic drive device includes a hydraulic cylinder, and inserting the hydraulic drive device into the lead screw includes inserting the middle hole of the hydraulic cylinder into the lead screw.

[0120] In some embodiments, the method further comprises controlling the screw 3 to rotate by the hydraulic drive device 2, so that the first claw 71 and the second claw 72 drive the valve seat 1 to move. According to an embodiment of the present application, the valve seat is pulled out by the force of the hydraulic cylinder.

[0121] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A puller, comprising a first clamping jaw and a second clamping jaw arranged opposite to each other, wherein: The first clamping claw comprises a first pulling portion, a first limiting portion and a first connecting portion connecting the first pulling portion and the first limiting portion, the first limiting portion comprises a first main body portion, a first notch portion and a second notch portion, the first notch portion is located on a side of the first main body portion close to the second clamping claw in the first direction, the second notch portion is located on a side of the first notch portion away from the first main body portion in the first direction, the size of the second notch portion in the second direction is larger than the size of the first notch portion in the second direction, and the second direction intersects with the first direction, The second clamping claw comprises a second pulling portion, a second limiting portion and a second connecting portion connecting the second pulling portion and the second limiting portion, the second limiting portion comprises a second main body portion, a third notch portion and a fourth notch portion, the third notch portion is located on a side of the second main body portion close to the first clamping claw in the first direction, the fourth notch portion is located on a side of the third notch portion away from the second main body portion in the first direction, and the size of the fourth notch portion in the second direction is greater than the size of the third notch portion in the second direction, The size of the first limiting portion in the first direction and the size of the first pulling portion in the first direction are both larger than the size of the first connecting portion in the first direction, and the size of the second limiting portion in the first direction and the size of the second pulling portion in the first direction are both larger than the size of the second connecting portion in the first direction. The size of the second pulling portion in the second direction is less than or equal to the size of the second notch in the second direction. Among them, the first claw and the second claw have the same shape and size, the size of the first pulling part in the second direction is less than or equal to the size of the fourth notch part in the second direction, the size of the first pulling part in the third direction is larger than 1 / 2 of the size of the first connecting part in the third direction, and the size of the second pulling part in the third direction is larger than 1 / 2 of the size of the second connecting part in the third direction.

2. The puller according to claim 1, wherein: The first limiting portion includes a first surface connected to the first connecting portion and a second surface arranged opposite to the first surface. The orthographic projection of the first main body on the first reference plane where the second surface is located, the orthographic projection of the first notch on the first reference plane, and the orthographic projection of the second notch on the first reference plane combine to form a first semicircle, the orthographic projection of the first main body on the first reference plane overlaps with the arc edge of the first semicircle, and the orthographic projection of the second notch on the first reference plane overlaps with the straight line of the first semicircle.

3. The puller according to claim 2, wherein: The second limiting portion includes a third surface connected to the second connecting portion and a fourth surface arranged opposite to the third surface. The orthographic projection of the second main body on the second reference plane where the third surface is located, the orthographic projection of the third notch on the second reference plane, and the orthographic projection of the fourth notch on the second reference plane are combined to form a second semicircle, the orthographic projection of the second main body on the second reference plane overlaps with the arc-shaped edge of the second semicircle, and the orthographic projection of the fourth notch on the second reference plane overlaps with the straight line of the second semicircle.

4. The puller according to claim 3, wherein: The first semicircle and the second semicircle are configured to be combined into a full circle.

5. The puller according to claim 1, wherein: The orthographic projection of the second notch on the first reference plane is a first rectangle, and the orthographic projection of the first notch on the first reference plane is a shape formed by the first arc and the long side of the first rectangle.

6. The puller according to claim 1, wherein: The orthographic projection of the fourth notch on the second reference plane is a second rectangle, and the orthographic projection of the third notch on the second reference plane is a shape formed by the second arc and the long side of the second rectangle.

7. The puller according to claim 4, wherein: The first connecting portion includes a first inner side wall and a first outer side wall. The first inner side wall is connected to a surface of the first main body portion close to the first notch portion, and the first outer side wall is arranged opposite to the first inner side wall.

8. The puller according to claim 7, wherein: The second connecting portion includes a second inner wall and a second outer wall. The second inner wall is connected to a surface of the second body close to the third notch, and the second outer wall is arranged opposite to the second inner wall.

9. The puller according to claim 8, wherein: The first drawing portion includes a third inner side wall and a third outer side wall, the third inner side wall is connected to the first inner side wall, the third inner side wall and the third outer side wall are arranged opposite to each other, the third inner side wall is provided with a first thread, and the first thread extends from the third inner side wall to the first inner side wall.

10. The puller according to claim 9, wherein: The second drawing portion includes a fourth inner side wall and a fourth outer side wall, the fourth inner side wall is connected to the second inner side wall, the fourth inner side wall is provided with a second thread, and the second thread extends from the fourth inner side wall to the third inner side wall.

11. The puller according to claim 10, wherein: The specification of the first thread is the same as that of the second thread.

12. The puller according to claim 7, wherein: The first outer side wall includes a first groove.

13. The puller according to claim 8, wherein: The second outer side wall includes a second groove.

14. A claw, comprising a first pulling portion, a first limiting portion and a first connecting portion connecting the first pulling portion and the first limiting portion, wherein the first limiting portion comprises a first main body portion, a first notch portion and a second notch portion, the first main body portion, the first notch portion and the second notch portion are sequentially arranged in a first direction, the size of the second notch portion in the second direction is larger than the size of the first notch portion in the second direction, and the second direction intersects with the first direction, The size of the first limiting portion in the first direction and the size of the first pulling portion in the first direction are both larger than the size of the first connecting portion in the first direction, and the size of the first pulling portion in the second direction is smaller than or equal to the size of the second notch in the second direction. The orthographic projection of the second notch on the reference plane is a rectangle, the orthographic projection of the first notch on the reference plane is a shape formed by an arc and the long side of the rectangle, and the size of the first pulling portion in the third direction is larger than 1 / 2 of the size of the first connecting portion in the third direction.

15. The claw according to claim 14, wherein: The first limiting portion includes a first surface connected to the first connecting portion and a second surface arranged opposite to the first surface. The orthographic projection of the first main body on the reference plane where the second surface is located, the orthographic projection of the first notch on the reference plane, and the orthographic projection of the second notch on the reference plane combine to form a first semicircle, the orthographic projection of the first main body on the reference plane overlaps with the arc edge of the first semicircle, and the orthographic projection of the second notch on the reference plane overlaps with the straight line of the first semicircle.

16. The claw according to claim 14, wherein: The first connecting portion includes a first inner side wall and a first outer side wall. The first inner side wall is connected to a surface of the first main body portion close to the first notch portion, and the first outer side wall is arranged opposite to the first inner side wall.

17. The jaw according to claim 16, wherein: The first drawing portion includes a third inner side wall and a third outer side wall, the third inner side wall is connected to the first inner side wall, the third inner side wall and the third outer side wall are arranged opposite to each other, the third inner side wall is provided with a first thread, and the first thread extends from the third inner side wall to the first inner side wall.

18. A method of using the puller according to claim 1, comprising: Place the first clamping claw into the valve seat and push the first clamping claw toward the edge of the valve seat. Place the second claw into the valve seat through the second notch, and push the second claw toward the edge of the valve seat. The first clamping claw and the second clamping claw are combined with each other, wherein the first limiting portion and the second limiting portion are respectively in contact with the upper end surface of the valve seat.

19. The method of use as described in claim 18 further includes screwing one end of the lead screw into the puller through the first notch portion, the second notch portion, the third notch portion and the fourth notch portion, so that one end of the lead screw is connected to the first pulling portion and the second pulling portion, and the hydraulic drive device is inserted into the other end of the lead screw and fixed by a nut.

20. The method of use as claimed in claim 19, further comprising controlling the rotation of the lead screw by a hydraulic drive device so that the first pulling part and the second pulling part drive the valve seat to move.

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