Packing replacement tool

Abstract

The present invention provides a packing replacement tool, which includes an upper support seat, which is of an annular structure. The upper support seat includes a semi-annular first support seat and a semi-annular second support seat. The first support seat and the second support seat are detachably connected by a clamping method; a lower support seat, which is of an annular structure. The lower support seat includes a semi-annular third support seat and a semi-annular fourth support seat. The third support seat and the fourth support seat are detachably connected by a clamping method; a driving device, one end of which is connected to the upper support seat and the other end is connected to the lower support seat. The driving device is used to drive the upper support seat and the lower support seat to move away from or close to each other. The gland and the gland nut will not fall off, improving safety. And the operator does not need to climb to operate, ensuring personal safety. The gland nut overcomes the upward elastic force generated by the new rubber packing in the stuffing box on the gland and the gland nut, thus avoiding the problems that the thread is easily damaged or the operator's fingers are easily injured by the way of moving and knocking in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of accessories for oil production wells in oil fields, and more specifically, to a packing replacement tool. Background Art

[0002] At the oil production site, the sealing between the wellhead of the pumping unit well and the polished rod is mainly achieved by the packing box sealing device. Currently, each time a single-well worker replaces the packing of the oil well, the pumping unit needs to be shut down first, and then the packing gland is removed. The gland and the gland nut are hung on the walking beam with a wire hook, and then the old packing is taken out of the packing box. The existing method for replacing the packing mainly has the following problems: Hooking the packing box gland and the gland nut with a wire hook may cause the packing box gland and the gland nut to fall off and injure the fingers of the operating staff; and in order to prevent the problem of pump jamming when the pumping unit stops near the lower dead center, the pumping unit usually needs to stop in the middle, which leads to the operating staff having to stand on the Christmas tree to hang the packing box gland and the gland nut, easily causing the operating staff to fall; when replacing the new packing, the operating staff needs to use a hammer to strike the new packing in order to easily put on the packing gland, which will damage the new packing, and the operating staff is prone to injure their fingers and the threads at the top of the packing box during the operation. Therefore, how to solve the above problems existing in the existing packing replacement method is an urgent need for those skilled in the art. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a packing replacement tool that can solve the problems existing in the existing packing box disassembly and assembly method.

[0004] To solve the above problems, the present invention provides a packing replacement tool, including an upper support, which is of a ring structure. The upper support includes a semi-circular first support and a semi-circular second support. The first support and the second support are detachably connected by a clamping method to form a ring structure; a lower support, which is of a ring structure. The lower support includes a semi-circular third support and a semi-circular fourth support. The third support and the fourth support are detachably connected by a clamping method to form a ring structure; a driving device, one end of which is connected to the upper support and the other end is connected to the lower support. The driving device is used to drive the upper support and the lower support to move away from or close to each other.

[0005] Preferably, the number of the driving devices is two.

[0006] Preferably, each driving device includes a screw rod, and opposite-handed threads are respectively provided at both ends of the screw rod. A threaded hole that is in threaded cooperation with the first end thread of the screw rod is provided on the upper support, and a threaded hole that is in threaded cooperation with the second end thread of the screw rod is provided on the lower support.

[0007] Preferably, a screwing section for screwing is provided in the middle of the screw rod, and the cross-section of the screwing section perpendicular to the axial direction of the screw rod is quadrilateral or hexagonal.

[0008] Preferably, first lugs are provided on both the first support and the second support, and threaded holes for threadedly mating with the first end of the screw rod are respectively provided on the two first lugs. Second lugs are provided on both the third support and the fourth support, and threaded holes for threadedly mating with the second end of the screw rod are respectively provided on the two second lugs.

[0009] Preferably, a rolling device is provided on the end face of the upper support opposite to the lower support.

[0010] Preferably, the rolling device includes two semi-circular ball trays, and each of the two ball trays is provided with a plurality of rotatable balls.

[0011] Preferably, an installation groove for installing the two ball trays is provided on the end face of the upper support close to the lower support.

[0012] Preferably, one of the first support and the second support is provided with a first convex block, and the other is provided with a first groove for the first convex block to extend into. A positioning pin for preventing the first convex block from disengaging from the first groove is provided on the side wall of the first groove. One of the third support and the fourth support is provided with a second convex block, and the other is provided with a second groove for the second convex block to extend into. A positioning pin for preventing the second convex block from disengaging from the second groove is provided on the side wall of the second groove.

[0013] Preferably, a first positioning groove is provided at the relative position of the first support and the second support. The packing replacement tool further includes a first connecting block. One end of the first connecting block extends into the first positioning groove of the first support, and the other end extends into the first positioning groove of the second support. Positioning pins for preventing the first connecting block from disengaging are provided on the groove walls of the respective first positioning grooves. A second positioning groove is provided at the relative position of the third support and the fourth support. The packing replacement tool further includes a second connecting block. One end of the second connecting block extends into the second positioning groove of the third support, and the other end extends into the second positioning groove of the fourth support. Positioning pins for preventing the second connecting block from disengaging are provided on the groove walls of the respective second positioning grooves.

[0014] In the technical solution provided by the present invention, a packing replacement tool includes an upper support seat, which is of a ring structure. The upper support seat includes a semi-circular first support seat and a semi-circular second support seat. The first support seat and the second support seat are detachably connected by a clamping method to form a ring structure; a lower support seat, which is of a ring structure. The lower support seat includes a semi-circular third support seat and a semi-circular fourth support seat. The third support seat and the fourth support seat are detachably connected by a clamping method to form a ring structure; a driving device, one end of which is connected to the upper support seat and the other end is connected to the lower support seat. The driving device is used to drive the upper support seat and the lower support seat to move away from or close to each other.

[0015] When the packing needs to be replaced, the gland nut of the packing box can be first loosened, then the third support seat and the fourth support seat are sleeved outside the packing box, and then the third support seat and the fourth support seat are connected into a ring structure, and the adjusting device of the packing box is used as a support to support the lower support seat. Then, the first support seat and the second support seat are located below the gland and sleeved outside the polished rod, and then the first support seat and the second support seat are connected into a ring structure. Then, the gland and the gland nut can be placed on the upper end surface of the upper support seat, which is convenient for the operator to replace the packing. Moreover, the gland and the gland nut are supported by the upper support seat, and the gland and the gland nut cannot pass through the upper support seat and fall, improving safety. And there is no need to hang the gland and the gland nut on the suspension rope of the pumping unit through a wire hook. Therefore, the pumping unit can stop at any position without worrying about the problem of pump jamming, and the operator does not need to climb high for operation, ensuring personal safety. After the new packing is installed, the third support seat and the fourth support seat of the lower support seat are opened and moved below the adjusting device, and then the third support seat and the fourth support seat are connected to make the adjusting device clamp the lower support seat to prevent the lower support seat from moving upward. Then, the first support seat and the second support seat of the upper support seat are opened and moved above the gland nut. By the driving device, the upper support seat and the lower support seat are moved closer to each other, and then the upper support seat gradually compresses the gland nut. The gland nut overcomes the upward elastic force generated by the new rubber packing in the packing box on the gland and the gland nut. The operator can easily thread the gland nut of the packing box with the thread of the packing box, thus avoiding the problems that the thread is easily damaged or the operator's fingers are easily injured by using the knocking method in the prior art. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of the packing replacement tool in the embodiment of the present invention;

[0018] Figure 2 For usingFigure 1 Schematic diagram of the use state of the middle packing replacement tool when removing the packing;

[0019] Figure 3 For using Figure 1 Schematic diagram of the use state of the middle packing replacement tool when installing the packing;

[0020] Figure 4 For Figure 1 Schematic diagram of the structure of the upper middle support;

[0021] Figure 5 For Figure 1 Schematic diagram of the structure of the lower middle support;

[0022] Figure 6 Schematic diagram of the structure of the rolling device in the embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the structure of the packing box in some embodiments.

[0024] Figures 1-7 In:

[0025] 1. First support; 2. Second support; 3. Third support; 4. Fourth support; 5. Screwing section; 6. First lug; 7. Second lug; 8. Installation groove; 9. First positioning groove; 10. Second positioning groove; 12. Positioning pin; 13. Compression cap; 14. Compression cover; 15. Adjusting device; 16. Screw rod; 17. Smooth rod; 18. Ball disk; 19. Ball. Specific embodiments

[0026] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] This specific embodiment provides a packing replacement tool that can solve the problems existing in the disassembly and assembly method of the packing box in the above-mentioned prior art.

[0028] Hereinafter, the embodiments will be described in detail with reference to the drawings. In addition, the embodiments shown below do not limit the content of the invention described in the claims in any way. Further, all the contents of the configurations shown in the following embodiments are not necessarily essential for the solution of the invention described in the claims.

[0029] Refer to Figures 1-7As shown, the packing replacement tool provided in the embodiment of the present invention includes an upper support, a lower support, and a driving device. Among them, the upper support is integrally in a ring structure, and the diameter of the central annulus thereof is larger than the diameter of the polished rod 17 so that the polished rod 17 can pass through. The upper support includes a first support 1 and a second support 2. Both the first support 1 and the second support 2 are in a semi-ring structure. The first support 1 and the second support 2 are spliced to form a ring structure, and the two are detachably connected by a clamping method. Among them, the lower support is integrally in a ring structure, and the diameter of its central annulus can be smaller than the outer dimension of the adjusting device of the packing box so that the adjusting device can hold the lower support. The lower support includes a third support 3 and a fourth support 4. Both the third support 3 and the fourth support 4 are in a semi-ring structure. The third support 3 and the fourth support 4 are spliced to form a ring structure, and the two are detachably connected by a clamping method. Among them, one end of the driving device is connected to the upper support, and the other end is connected to the lower support. The driving device is used to drive the upper support and the lower support to approach or move away from each other.

[0030] Reference Figure 2 , 3 , 7, when the packing needs to be replaced, the packing box gland nut 13 can be first loosened, then the third support 3 and the fourth support 4 are sleeved on the outside of the packing box, and then the third support 3 and the fourth support 4 are connected into a ring structure, and the adjusting device 15 of the packing box is used as a support to support the lower support. Then, the first support 1 and the second support 2 are located below the gland nut 13 and sleeved on the outside of the polished rod 17, and then the first support 1 and the second support 2 are connected into a ring structure. Then, the gland 14 and the gland nut 13 can be placed on the upper end face of the upper support. Figure 2The figure shows a schematic diagram when replacing the first-stage packing. The replacement method for multiple-stage packing is the same. In this way, the gland 14 and the gland nut 13 are supported by the upper support. It is impossible for the gland 14 and the gland nut 13 to pass through the upper support and fall off, which improves safety, facilitates the operator to replace the packing, and there is no need to hang the gland 14 and the gland nut 13 on the suspension of the pumping unit with a wire hook. Therefore, the pumping unit can stop at any position without worrying about the problem of pump jamming, and the operator does not need to climb to a high place for operation, ensuring personnel safety. After installing the new packing, open the third support 3 and the fourth support 4 of the lower support, move them below the adjusting device 15 and then connect the third support 3 and the fourth support 4 to make the adjusting device 15 hold the lower support to prevent the lower support from moving upward. Then open the first support 1 and the second support 2 of the upper support, move them above the gland 14 or the gland nut 13, and make the upper support and the lower support approach each other through the driving device. Then the upper support gradually compresses the gland nut 13, and the gland nut 13 overcomes the upward elastic force generated by the new rubber packing in the packing box on the gland 14 and the gland nut 13. The operator can easily thread the gland nut 13 on the packing box with the thread of the packing box, thus avoiding the problems in the prior art that the thread is easily damaged or the operator's fingers are easily injured by using the knocking method. It should be noted that referring to Figure 7 As shown, the structure of the packing box belongs to the prior art. Its structure is nothing more than a cylinder body and a gland nut 13. A tapered hole for installing the packing is provided in the cylinder body. The gland nut 13 is threadedly connected to the cylinder body. The polished rod 17 passes through the entire packing box. A gland 14 is provided in the gland nut 13. The gland nut 13 compresses the gland 14, and the gland 14 compresses the packing in the tapered hole so that the packing adheres to the outer wall of the polished rod 17, thus forming a sealing structure.

[0031] In some embodiments, the number of driving devices is two. By providing two driving devices, the upper support and the lower support can receive more stable tensile or supporting forces. Each driving device includes a screw rod 16. Threads with opposite helix directions are provided at both ends of the screw rod 16. The upper support is provided with a threaded hole that is threadedly engaged with the first end of the screw rod 16, and the lower support is provided with a threaded hole that is threadedly engaged with the second end of the screw rod 16. By screwing the screw rod 16, the upper support and the lower support can approach or move away from each other. The structure is simple and the operation is convenient. For the convenience of the operator to screw, in some embodiments, a screwing section 5 for screwing is provided in the middle of the screw rod 16. The cross-section of the screwing section 5 perpendicular to the axial direction of the screw rod 16 is quadrilateral or hexagonal. By providing the screwing section 5, the operator can use a wrench to screw the screwing section 5, thereby rotating the screw rod 16.

[0032] In some embodiments, first lugs 6 are provided on both the first support 1 and the second support 2. Threaded holes for threadedly mating with the first end of the screw 16 are respectively provided on the two first lugs 6, and the two first lugs 6 correspond to the first support 1 and the second support 2 one by one. Second lugs 7 are provided on both the third support 3 and the fourth support 4. Threaded holes for threadedly mating with the second end of the screw 16 are respectively provided on the two second lugs 7, and the two second lugs 7 correspond to the third support 3 and the fourth support 4 one by one.

[0033] In some embodiments, a rolling device is provided on the end face of the upper support opposite to the lower support. By providing the rolling device, when the upper support presses the compression nut 13, the rolling device can reduce the pressure between the upper support and the top of the compression nut 13, that is, the upper support presses the compression nut 13 through the rolling device. While compressing the packing, it is more convenient for the user to screw the compression nut 13. In some embodiments, the rolling device includes two semi-circular ball trays 18. Each of the two ball trays 18 is provided with a plurality of rotatable balls 19. The ball tray 18 can refer to the ball tray in a thrust bearing. The difference is that the ball tray in the thrust bearing is annular, while in this embodiment, an annular ball tray cannot be sleeved on the polished rod 17, and this problem can be solved by using two semi-circular ball trays 18, and finally the effect of reducing the friction between the upper support and the compression nut 13 when installing the packing is achieved. In some embodiments, in order to prevent the ball tray 18 from slipping, an installation groove 8 for installing the two ball trays 18 is provided on the end face of the upper support close to the lower support side. The installation groove 8 is used to limit the ball tray 18, so as to prevent the ball tray 18 from slipping.

[0034] In some embodiments, referring to Figure 4 , a first positioning groove 9 is provided at the relative position of the first support 1 and the second support 2. The packing replacement tool further includes a first connecting block. One end of the first connecting block extends into the first positioning groove 9 of the first support 1, and the other end extends into the first positioning groove 9 of the second support 2. Positioning pins 12 for preventing the first connecting block from coming out are provided on the groove walls of each first positioning groove 9. The positioning pins 12 pass through the groove wall of the first positioning groove 9 and penetrate into the first connecting block, so as to prevent the first connecting block from coming out of the first positioning groove 9. The number of the first positioning grooves 9 on the first support 1 and the second connecting seat is two, and the two first positioning grooves 9 on the first support 1 are symmetric about the center of the semi-ring of the first support 1, and the first positioning groove 9 on the second support 2 is symmetric about the center of the semi-ring of the second support 2. In this way, the first support 1 and the second support 2 are connected by using two first connecting blocks, and the overall rigidity of the upper support is better.

[0035] Referring to Figure 5As shown, a second positioning groove 10 is provided at the relative positions of the third support 3 and the fourth support 4. The packing replacement tool further includes a second connecting block. One end of the second connecting block extends into the second positioning groove 10 of the third support 3, and the other end extends into the second positioning groove 10 of the fourth support 4. Positioning pins 12 for preventing the second connecting block from disengaging are provided on the groove walls of each second positioning groove 10. The positioning pins 12 pass through the groove wall of the second positioning groove 10 and penetrate into the second connecting block, thereby preventing the second connecting block from disengaging from the second positioning groove 10. The number of second positioning grooves 10 on the third support 3 and the fourth connecting seat is two, and the two second positioning grooves 10 on the third support 3 are symmetric about the center of the semi-ring of the third support 3, and the second positioning grooves 10 on the fourth support 4 are symmetric about the center of the semi-ring of the fourth support 4. In this way, the third support 3 and the fourth support 4 are connected by two second connecting blocks, and the overall rigidity of the lower support is better.

[0036] In some embodiments, one of the first support 1 and the second support 2 is provided with a first convex block, and the other is provided with a first groove for the first convex block to extend into. A positioning pin 12 for preventing the first convex block from disengaging from the first groove is provided on the side wall of the first groove. The principle is the same as that of the previous embodiment, except that the first convex block and the first support 1 or the second support 2 are of an integral structure or fixedly connected, and the same applies hereinafter. One of the third support 3 and the fourth support 4 is provided with a second convex block, and the other is provided with a second groove for the second convex block to extend into. A positioning pin 12 for preventing the second convex block from disengaging from the second groove is provided on the side wall of the second groove.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A packing replacement method, characterized in that, It adopts a packing replacement tool, and the packing replacement tool includes an upper support, which is of a ring structure. The upper support includes a semi-circular first support (1) and a semi-circular second support (2). The first support (1) and the second support (2) are detachably connected by a clamping method to form a ring structure; a lower support, which is of a ring structure. The lower support includes a semi-circular third support (3) and a semi-circular fourth support (4). The third support (3) and the fourth support (4) are detachably connected by a clamping method to form a ring structure; a driving device, one end of which is connected to the upper support and the other end is connected to the lower support. The driving device is used to drive the upper support and the lower support to move away from or close to each other; a rolling device is provided on the end face of the upper support opposite to the lower support; the rolling device includes two semi-circular ball trays, and each ball tray is provided with a plurality of rotatable balls; an installation groove (8) for installing the two ball trays is provided on the end face of the upper support close to the lower support; The packing box includes a cylinder body, a gland (13), a gland cover (14), an adjusting device (15) and packing. The gland (13) is connected to the cylinder body. A gland cover (14) is arranged inside the gland (13). The gland (13) presses the gland cover (14), and the gland cover (14) presses the packing. The adjusting device (15) is arranged at the bottom of the packing box; The packing replacement method includes the following steps: When the packing needs to be replaced, first loosen the gland (13) of the packing box, then sleeved the third support (3) and the fourth support (4) on the outside of the packing box, then connect the third support (3) and the fourth support (4) into a ring structure, and use the adjusting device (15) of the packing box as a support to support the lower support. Then make the first support (1) and the second support (2) be located below the gland (13) and sleeved on the outside of the polished rod (17), and then connect the first support (1) and the second support (2) into a ring structure, and then the gland cover (14) and the gland (13) can be placed on the upper end face of the upper support; After installing the new packing, open the third support (3) and the fourth support (4) of the lower support, and move them below the adjusting device (15), then connect the third support (3) and the fourth support (4) to make the adjusting device (15) clamp the lower support to prevent the lower support from moving upward. Then open the first support (1) and the second support (2) of the upper support and move them above the gland (13). Through the driving device, the upper support and the lower support are made to approach each other, then the upper support gradually presses the gland (13), and the gland (13) overcomes the upward elastic force generated by the new rubber packing in the packing box on the gland cover (14) and the gland (13) and is screwed well with the packing box.

2. The packing replacement method according to claim 1, characterized in that, The number of the driving devices is two.

3. The packing replacement method according to claim 2, wherein Each of the driving devices includes a screw rod. Threads with opposite rotation directions are respectively provided at both ends of the screw rod. The upper support is provided with a threaded hole that is in threaded cooperation with the first end of the screw rod, and the lower support is provided with a threaded hole that is in threaded cooperation with the second end of the screw rod.

4. The packing replacement method according to claim 3, characterized in that, A screwing section (5) for screwing is provided in the middle of the screw, and the cross-section of the screwing section (5) perpendicular to the axial direction of the screw is quadrilateral or hexagonal.

5. The packing replacement method according to claim 3, characterized in that First lugs (6) are provided on both the first support (1) and the second support (2), and threaded holes for threadedly mating with the first end of the screw are respectively provided on the two first lugs (6). Second lugs (7) are provided on both the third support (3) and the fourth support (4), and threaded holes for threadedly mating with the second end of the screw are respectively provided on the two second lugs (7).

6. The packing replacement method according to claim 1, characterized in that, One of the first support (1) and the second support (2) is provided with a first convex block, and the other is provided with a first groove for the first convex block to extend into. A positioning pin (12) for preventing the first convex block from disengaging from the first groove is provided on the side wall of the first groove. One of the third support (3) and the fourth support (4) is provided with a second convex block, and the other is provided with a second groove for the second convex block to extend into. A positioning pin (12) for preventing the second convex block from disengaging from the second groove is provided on the side wall of the second groove.

7. The packing replacement method according to claim 1, characterized in that First positioning grooves (9) are provided at opposite positions of the first support (1) and the second support (2). The packing replacement tool further includes a first connecting block. One end of the first connecting block extends into the first positioning groove (9) of the first support (1), and the other end extends into the first positioning groove (9) of the second support (2). Positioning pins (12) for preventing the first connecting block from disengaging are provided on the groove walls of the respective first positioning grooves (9). Second positioning grooves (10) are provided at opposite positions of the third support (3) and the fourth support (4). The packing replacement tool further includes a second connecting block. One end of the second connecting block extends into the second positioning groove (10) of the third support (3), and the other end extends into the second positioning groove (10) of the fourth support (4). Positioning pins (12) for preventing the second connecting block from disengaging are provided on the groove walls of the respective second positioning grooves (10).

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