Clamp for connecting intermediate pull rod to piston rod

Abstract

The intermediate pull rod and piston rod connecting clamp disclosed by the application comprises a circular plate-shaped body, a sliding cavity is formed in the center of the body, a sliding block is arranged in the sliding cavity in a matched mode, a screw rod is threadedly connected to the center of the sliding block and penetrates the body in a radial direction, the screw rod is positioned in the body in an axial direction and penetrates out of the body at one end, wedge-shaped sliding grooves are formed in the sliding block on both sides along the length direction of the screw rod, sliding grooves that are in communication with the outside are formed in the body on both sides of the sliding cavity corresponding to the wedge-shaped sliding grooves, clamping plates are arranged in each sliding groove in a matched mode, one end of the clamping plate close to the inside is clamped in the wedge-shaped sliding groove in a matched mode, and the other end of the clamping plate close to the outside extends to both sides of the body and is provided with a pressing groove for connecting the intermediate pull rod and the piston rod. The application utilizes the transmission of the threaded pair and the self-locking function of the wedge-shaped mechanism to solve the problem that the single bolt fastening is easy to loosen.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas equipment technology, specifically relating to a clamp for connecting an intermediate tie rod and a piston rod. Background Technology

[0002] As an essential component of drilling rigs, the drilling pump pumps pump mud through the reciprocating motion of a piston. This piston motion is achieved by the crankshaft driving the piston rod via the connecting rod, crosshead, and intermediate tie rod. Therefore, the reliability of the connection between the intermediate tie rod and the piston rod is crucial to the reliability of the drilling pump. Currently, the intermediate tie rod and piston rod are connected by clamps, such as... Figure 1 As shown, during installation, the two semicircular parts of the clamp need to be separated. Then, the two semicircular clamps are secured to the outer circle of the protrusion on the already connected intermediate tie rod and piston rod through the inner groove. Finally, the bolts at both ends of the clamp are tightened to the specified torque, thus firmly connecting the intermediate tie rod and piston rod. The clamp assembly consists of two semicircular clamps. The clamp assembly is relatively heavy, and the bolts at both ends of the clamp are easily loosened when the drilling pump is working, leading to the failure of the connection between the intermediate tie rod and piston rod. Summary of the Invention

[0003] The purpose of this invention is to provide a clamp for connecting the intermediate tie rod and the piston rod, which solves the problem that the bolts at both ends of the existing clamp are prone to loosening.

[0004] The technical solution adopted in this invention is as follows: a clamp for connecting the intermediate pull rod and the piston rod includes a circular plate-shaped body. A sliding cavity is provided at the center of the body, and a slider is fitted inside the sliding cavity. A lead screw is threaded through the center of the slider along the radial direction of the body. The two ends of the lead screw are axially positioned inside the body, with one end extending outward. Wedge-shaped sliding grooves are provided on both sides of the slider along the length of the lead screw. Corresponding to the wedge-shaped sliding grooves on both sides of the sliding cavity inside the body, outwardly communicating sliding grooves are provided. A retaining plate is fitted inside each sliding groove. The inner end of the retaining plate is engaged in the wedge-shaped sliding groove, and the outer end of the retaining plate extends to both sides of the body and is respectively provided with a clamping groove for connecting the intermediate pull rod and the piston rod.

[0005] The invention is further characterized in that,

[0006] A positioning groove is provided at one end of the body near the sliding cavity, and a positioning platform located in the positioning groove is fixedly sleeved at one end of the lead screw.

[0007] The cross-section of the wedge-shaped sliding groove along the radial direction of the lead screw is T-shaped. The horizontal section of the wedge-shaped sliding groove near the vertical section is sloped along the length of the lead screw. The inclination angle of the slope is smaller than the material friction angle of the wedge-shaped sliding groove. The clamping plate extends into the vertical section of the wedge-shaped sliding groove and is fitted and engaged with a shape that is compatible with its horizontal section.

[0008] The opening of the clamping groove faces the main body, and the inner wall of the clamping groove on the side away from the main body is an outwardly inclined slope. The connecting end of the middle tie rod or piston rod extends into the clamping groove and has an inclined surface that adapts to the slope of its inner wall.

[0009] The bottom of the clamping groove, away from the main body, has a downward-through anti-rotation screw hole, and an anti-rotation screw that extends into the clamping groove is threaded into the anti-rotation screw hole.

[0010] Positioning holes are provided at the center of both ends of the main body.

[0011] The main body is formed by connecting the end faces of two circular plate-shaped main body I and main body II. The edges of main body I and main body II are provided with interconnected mounting holes, and screws are connected to the common thread in the mounting holes.

[0012] The beneficial effects of this invention are as follows: The clamp connecting the intermediate pull rod and the piston rod of this invention, by rotating the lead screw, causes the slider to slide axially within the sliding cavity. During the sliding process, the wedge-shaped sliding groove drives the clamping plate within the groove to tighten radially inward along the body, thereby securing the intermediate pull rod and piston rod, which are clamped to both sides of the body, through the clamping groove in the clamping plate. This invention utilizes the transmission of the threaded pair and the self-locking function of the wedge mechanism, solving the problem of easy loosening when fastened with a single bolt. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the existing connecting clamp between the intermediate tie rod and the piston rod;

[0014] Figure 2 This is a schematic diagram of the clamp used to connect the intermediate pull rod and the piston rod in this invention;

[0015] Figure 3 This is an exploded view of the clamp connecting the intermediate tie rod and the piston rod of the present invention.

[0016] Figure 4 This is a schematic diagram of the structure of the main body I in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0017] Figure 5 This is a schematic diagram of the structure of the main body II in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0018] Figure 6 This is a schematic diagram of the slider in the clamp used to connect the intermediate pull rod and the piston rod of the present invention;

[0019] Figure 7 This is an axial cross-sectional view of the slider in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0020] Figure 8 This is a schematic diagram of the lead screw in the clamp used to connect the intermediate pull rod and the piston rod of the present invention;

[0021] Figure 9 This is a schematic diagram of the clamp plate I in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0022] Figure 10 This is a cross-sectional view of the clamp plate I in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0023] Figure 11 This is a schematic diagram of the clamp plate II in the clamp for connecting the intermediate pull rod and the piston rod of the present invention;

[0024] Figure 12 This is a cross-sectional view of the clamp plate II in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0025] Figure 13 This is a schematic diagram of the clamping part in the clamp for connecting the intermediate pull rod and the piston rod of the present invention;

[0026] Figure 14 This is a partial assembly drawing of the clamp in the clamp for connecting the intermediate tie rod and the piston rod of the present invention;

[0027] Figure 15 This is a structural diagram of the middle tie rod;

[0028] Figure 16 This is a schematic diagram of the piston rod structure;

[0029] Figure 17 This is a schematic diagram of the connection between the intermediate pull rod and the piston rod using a clamp according to the present invention.

[0030] In the diagram, 1. Clamp, 2. Intermediate tie rod, 3. Piston rod, 4. Clamping plate I, 5. Body I, 6. Lead screw, 7. Clamping plate II, 8. Slider, 9. Body II, 10. Screw, 11. Spring washer, 12. Anti-rotation screw, 13. Wedge-shaped sliding surface of clamping plate I, 14. Clamping plate pressing surface I, 15. Anti-rotation screw hole, 16. Clamping plate pressing surface II, 17. Wedge-shaped sliding surface of clamping plate II, 18. Positioning hole I, 19. Mounting threaded hole, 20. Positioning groove I, 21. Sliding cavity I, 22. Slide groove I, 23. Slide groove II, 24. Positioning groove II, 25. Positioning hole II, 26. Mounting hole, 27. Sliding cavity II, 28. Handle, 29. Slider wedge-shaped sliding surface, 30. Threaded hole, 31. Positioning platform, 32. Inside of the wrench, 33. Supporting cylindrical surface I, 34. Supporting cylindrical surface II. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] This invention provides a clamp for connecting the intermediate tie rod and the piston rod, such as... Figure 2 and Figure 3 As shown, it includes clamping plate I4, body I5, lead screw 6, clamping plate II7, slider 8, body II9, screw 10, spring washer 11, anti-rotation screw 12, etc.

[0033] Body I5 and Body II9 have basically the same structure, as shown below. Figure 4 and Figure 5 As shown, it includes: positioning hole I18, mounting threaded hole 19, positioning groove I20, sliding cavity I21, sliding groove I22, sliding groove II23, positioning groove II24, positioning hole II25, mounting hole 26, sliding cavity II27, and handle 28. Positioning hole I18 and positioning hole II25 respectively cooperate with the positioning boss at the end of piston rod 3 and intermediate pull rod 2 for radial positioning; screw 10 installs body I5 and body II9 together through mounting threaded hole 19 and mounting hole 26, and positioning groove I20 and positioning groove II24 form a complete circular positioning groove. Thus, when lead screw 6 is installed on the body (body I5 and body II9 are installed together), the circular positioning groove restricts the axial movement of lead screw 6 through positioning platform 31; sliding groove I22 and sliding groove II23... A rectangular slide groove is formed, and the clamping plates I4 and II7 can slide within the rectangular slide groove. After the sliding cavities I21 and II27 are assembled, a complete sliding cavity is formed. In this way, the slider 8 can slide axially within the sliding cavity as the lead screw 6 rotates. At the same time, the structural design also allows the slider 8 and the lead screw 6 to move up and down a certain distance within the sliding cavity, so as to avoid the clamping plates I4 and II7 not being able to press the piston rod 3 and the intermediate tie rod 2 simultaneously or to generate additional bending moment on the positioning bosses at the ends of the piston rod 3 and the intermediate tie rod 2.

[0034] like Figure 6 and Figure 7 The slider 8 shown has a wedge-shaped sliding groove with a slider wedge-shaped sliding surface 29 inside. The upper and lower slider wedge-shaped sliding surfaces 29 and the locking plate I 4 cooperate with the locking plate I wedge-shaped sliding surfaces 13 and 17 on both sides of the lower part of the locking plate II 7. In addition, the threaded hole 30 cooperates with the lead screw 6 to form a threaded pair. When the lead screw 6 rotates in the installed body, the slider 8 will slide axially along the axis of the lead screw 6 in the body. At the same time, due to the cooperation of the wedge-shaped sliding surfaces, the slider 8 will also drive the locking plates I 4 and II 7 to slide up and down in the rectangular groove of the body.

[0035] like Figure 8The lead screw 6 shown includes a positioning platform 31, a wrench inner square 32, a supporting cylindrical surface I 33, and a supporting cylindrical surface II 34. The lead screw 6 is installed in the inner hole of the main body and is supported by the supporting cylindrical surfaces I 33 and II 34. The axial movement of the lead screw 6 is restricted by the positioning platform 31. The external thread of the lead screw 6 and the threaded hole 30 of the slider 8 cooperate to form a threaded pair. Since the lead screw 6 and the slider 8 are installed in the main body, the lead screw 6 cannot move axially and the slider 8 cannot rotate in the slider cavity. Therefore, when the lead screw 6 is rotated, the slider 8 will move relative to the axis of the lead screw 6 in the slider cavity, thereby driving the clamping plate I 4 and the clamping plate II 7 to slide up and down in the main body.

[0036] The structures of card plate I4 and card plate II7 are as follows: Figure 9 , Figure 10 and Figure 11 , Figure 12 As shown, both sides of the clamping groove are designed with wedge-shaped sliding surfaces 13 and 17 of the clamping plate I and clamping plate II, respectively. The wedge angle is smaller than the friction angle of the material to ensure that the wedge-shaped sliding surfaces have a self-locking function after they are engaged. The wedge-shaped sliding surfaces 13 and 17 of the clamping plate I and the wedge-shaped sliding surfaces 29 of the slider 8 are engaged with each other and can slide relative to each other. The two inner sides of the upper part of the clamping plate are designed with clamping surfaces I 14 and II 16 of a certain slope. Two anti-rotation screw holes 15 are designed on the clamping plate I 4 to prevent the clamping clamp 1 from rotating relative to the middle pull rod 2 and piston rod 3 after installation.

[0037] The clamping part of clamp 1 is as follows Figure 13 As shown, the clamping part of clamp 1 is also the linkage clamping mechanism of clamp 1. First, the lead screw 6 is installed in the threaded hole 30 of slider 8. Then, clamping plates I 4 and II 7 are installed in the wedge-shaped sliding grooves at the upper and lower ends of slider 8, and the wedge-shaped sliding surfaces 13 and 17 of clamping plates I 1 and II 7 on the lower sides of the lower part of clamping plates II 7 engage with the wedge-shaped sliding surface 29 inside slider 8. A partial assembly diagram of clamp 1 is shown below. Figure 14 As shown, after installation, it is installed as a whole into the sliding cavity I21 of the main body I5. Then, the main body II9 is ​​installed together with the main body I5 using screws 10 and spring washers 11. At the same time, two anti-rotation screws 12 are installed in the anti-rotation screw holes 15 on the upper part of the clamping plate I4, as shown. Figure 2 As shown, a complete clamp 1 is now assembled.

[0038] When in use, the intermediate pull rod 2 and piston rod 3 are as follows: Figure 15 and Figure 16As shown, the ends of the intermediate pull rod 2 and piston rod 3 that are connected to each other are designed to be inclined surfaces with the same slope as the upper clamping surfaces I14 and II16 of the clamping plates I4 and II7. First, bring the intermediate pull rod 2 and piston rod 3 closer together, and insert the positioning bosses of the intermediate pull rod 2 and piston rod 3 into the positioning holes I18 and II25 of the two sides of the installed clamp 1 body I5 and body II9 for radial positioning of the intermediate pull rod 2 and piston rod 3. Then, rotate the clamp 1 so that the clamping surfaces I14 and II16 on the upper part of the clamping plates I4 and II7 on both sides correspond to the inclined surfaces at the ends of the intermediate pull rod 2 and piston rod 3. Next, rotate the screw 6 through the inner 32 of the wrench to drive the slider 8 to slide in the sliding cavity of the body. Through the sliding engagement of the slider wedge sliding surface 29 with the wedge sliding surfaces 13 and 17 of the clamping plates I and II, the clamping plates I4 and II7 move radially inward at the same time. At the same time, the clamping surfaces I14 and II16 of the clamping plates I4 and II7 will be pressed against and pressed tightly to the inclined surfaces at the ends of the intermediate pull rod 2 and piston rod 3. Figure 17 As shown, the two anti-rotation screws 12 are finally installed in the anti-rotation screw holes 15 on the upper part of the clamp plate I4 and tightened to prevent the clamp 1 from rotating relative to the intermediate pull rod 2 and the piston rod 3. At the same time, since the threaded pair of the lead screw 6 and the wedge-shaped sliding groove have a good self-locking function, the clamp 1 will also have a good self-locking function after pressing the intermediate pull rod 2 and the piston rod 3 together, thereby realizing a firm connection between the intermediate pull rod 2 and the piston rod 3.

[0039] In the above manner, the clamp for connecting the intermediate pull rod and the piston rod of the present invention utilizes the transmission of the threaded pair and the self-locking function of the wedge mechanism, which solves the problem of easy loosening when fastened with a single bolt. The installation process is simple and the labor intensity is low.

Claims

1. A clamp for connecting the intermediate tie rod and the piston rod, characterized in that, The device includes a circular plate-shaped body with a sliding cavity at its center. A slider (8) is fitted inside the sliding cavity. The center of the slider (8) passes through the body radially and is threadedly connected to a lead screw (6). Both ends of the lead screw (6) are axially positioned inside the body, with one end extending outward. A positioning platform (31) located in a positioning groove is fixedly sleeved on one end of the lead screw (6). A positioning groove is provided near one end of the sliding cavity inside the body. Wedge-shaped sliding grooves are provided on both sides of the slider (8) along the length of the lead screw (6). The cross-section of the wedge-shaped sliding groove along the radial direction of the lead screw (6) is T-shaped. The horizontal section of the wedge-shaped sliding groove near the vertical section is a slope along the length of the lead screw (6). The angle of the slope is less than the material friction angle of the wedge-shaped sliding groove. A clamping plate extends into the vertical section of the wedge-shaped sliding groove and is used in conjunction with it. The horizontal section is fitted with a corresponding shape for locking. The two sides of the sliding cavity in the body are provided with outwardly connected sliding grooves corresponding to the wedge-shaped sliding grooves. Each sliding groove is fitted with a locking plate. The inner end of the locking plate is fitted into the wedge-shaped sliding groove. The outer end of the locking plate extends to both sides of the body and is respectively provided with a pressing groove connected to the middle pull rod (2) and the piston rod (3). The opening of the pressing groove faces the body. The inner wall of the pressing groove away from the body is an outwardly inclined slope. The connecting end of the middle pull rod (2) or the piston rod (3) extends into the pressing groove and is provided with a slope that is adapted to the slope of its inner wall. The bottom of the pressing groove away from the body is provided with a downwardly penetrating anti-rotation screw hole (15). The anti-rotation screw hole (15) is threaded with an anti-rotation screw (12) that extends into the pressing groove.

2. The clamp for connecting the intermediate tie rod and the piston rod as described in claim 1, characterized in that, Positioning holes are provided at the center of both end faces of the main body.

3. The clamp for connecting the intermediate tie rod and the piston rod as described in claim 1, characterized in that, The main body is formed by connecting the end faces of a circular plate-shaped main body I (5) and a main body II (9). The edges of the main body I (5) and the main body II (9) are provided with interconnected mounting holes (26), and screws (10) are threaded into the mounting holes (26).

Images