Quick change device for piston rod of drilling pump and quick disassembly method and installation method of quick change device

Abstract

The invention discloses a quick-change device for a piston rod of a drilling pump and a quick-release method and an installation method of the quick-change device, and belongs to the technical field of petroleum and natural gas equipment. The device comprises a connecting pup joint used for connecting a pull rod and a piston rod, the connecting pup joint comprises a barrel, and a first connecting block and a second connecting block are arranged in the barrel; a first protruding structure used for being connected with a piston rod is arranged at one end of the first connecting block, and a second protruding structure used for being connected with a pull rod is arranged at one end of the second connecting block. According to the structural design, the connecting pup joint is fully utilized to adopt protruding structural design at the two ends, so that the effect of quick disassembly and quick assembly is achieved.

Description

Technical Field

[0001] The present invention relates to a quick replacement device for a piston rod of a drilling pump, a quick disassembly method and an installation method for the quick replacement device, and belongs to the technical field of oil and gas equipment. Background Art

[0002] A drilling pump is an important component of an oil or gas drilling rig and has functions such as circulating drilling mud and injecting cement for well cementing. The piston rod is a key part of the mud pump, connecting the power end to the hydraulic end and playing a role in force transmission. The piston rod needs to be disassembled every time the piston or other wearing parts are replaced.

[0003] Currently, there are integral piston rods ( Figure 6 ), and two-section piston rods ( Figure 7 ). The integral piston rod is directly connected to the intermediate pull rod through a clamp. When replacing the piston, the cylinder liner needs to be disassembled simultaneously to pull out the piston, which increases unnecessary work. The two-section piston rod can be disassembled, and the piston can be pulled out without disassembling the cylinder liner. The piston rod is divided into a front section and a rear section of the piston rod, and the two sections are connected by threads. When installing, a pre-tightening force needs to be applied to ensure the reliability of the connection. And this connection method has relatively high requirements for thread loosening prevention during the reciprocating movement of the piston, which is likely to cause fatigue fracture of the threads and has poor use effects. The labor intensity during the installation process is large and it is cumbersome.

[0004] Patent documents CN201922439235.1 and CN201911401023.2 disclose a device for quickly disassembling the piston rod of a mud pump. This structure combines the structural design of the traditional two-section piston rod and sets a chuck with an assembly structure fixed by a clamp. There is still a relatively high requirement for thread loosening prevention during the reciprocating movement of the piston, which is likely to cause fatigue fracture of the threads and has poor use effects.

[0005] Patent document US10036384B1 redesigned the intermediate pull rod structure for the quick-disassembly piston rod assembly, changed the end part to a protruding connection, and realized the connection between the head of the piston rod and the intermediate pull rod through an intermediate short joint; the short joint adopts a way of one end protruding and one end extending in. Among them, when connecting the extending-in end, it is necessary to ensure that the protruding end of the intermediate pull rod, the connecting piece and the three pin holes of the cylinder body are collinear to facilitate the installation of the pin, which has relatively high requirements for processing accuracy and on-site operation. Summary of the Invention

[0006] The object of the present invention is to provide a quick replacement device for a piston rod of a drilling pump and an installation method, which can further improve the quick disassembly efficiency and the quick installation efficiency of the piston rod through the protruding structure design at both ends of the connecting short joint.

[0007] The technical solution adopted by the present invention is as follows: A quick replacement device for the piston rod of a drilling pump, comprising a connecting stub for connecting a pull rod and a piston rod. The connecting stub includes a cylinder body, and a first connecting block and a second connecting block are arranged inside the cylinder body; One end of the first connecting block is provided with a first protruding structure for connecting the piston rod, and one end of the second connecting block is provided with a second protruding structure for connecting the pull rod; A wedge-shaped opening is arranged in the middle of the first connecting block and the second connecting block. The first connecting block is assembled in the wedge-shaped opening of the second connecting block, and the second connecting block is assembled in the wedge-shaped opening of the first connecting block. An adjusting device for driving the connecting block to move axially along the cylinder body is also arranged between the first connecting block and the second connecting block; An elastic element is also arranged between the inner side surface of one end of the first connecting block with the first protruding structure and the outer side surface of the other end of the second connecting block, and between the inner side surface of one end of the second connecting block with the second protruding structure and the outer side surface of the other end of the first connecting block.

[0008] Further, the adjusting device includes a wedge block arranged between the inner side surface of the other end of the first connecting block and the inner side surface of the other end where the second connecting block is assembled, and a regulator for adjusting the movement of the wedge block.

[0009] Further, the regulator is a threaded rod. A through hole is arranged in the middle of the cylinder body. The regulator is rotatably and fixedly assembled in the through hole on the cylinder body. An internal threaded hole is arranged in the wedge block, and the regulator rotates to make the wedge block move axially along the regulator.

[0010] Further, fitting grooves are arranged on the outer sides of the ends of the first connecting block and the second connecting block away from the protruding structures. The elastic element is arranged in the fitting grooves, extends out of the fitting grooves, and the end parts of the elastic element located outside the fitting grooves respectively match the inner side surfaces of the ends of the first connecting block and the second connecting block where the protruding structures are located.

[0011] Further, the inner side surfaces of the ends of the first connecting block and the second connecting block away from the protruding structures are wedge-shaped surfaces. An opening is formed between the ends away from the protruding structures and the ends where the protruding structures are located. The first connecting block and the second connecting block are respectively arranged in the opposite openings, and the wedge-shaped surfaces form opposing inner side surfaces for matching with the wedge block.

[0012] Further, radial through holes are respectively arranged on the first protruding structure and the second protruding structure for assembly.

[0013] Further, a first groove is arranged at the end of the piston rod. The first groove is provided with a mounting hole matching the radial through hole on the first protruding structure. The first protruding structure is assembled in the first groove and is fixedly assembled through a connecting piece.

[0014] Furthermore, a second groove is provided at the end of the pull rod. The second groove is provided with mounting holes matching the radially penetrating holes on the second protruding structure. The second protruding structure is assembled in the second groove and fixed by a connecting member.

[0015] Furthermore, an assembly mechanism is provided between the pull rod and the connecting stub. The assembly mechanism includes a flange plate assembled with the connecting stub and a clamp fixed to the flange plate for connecting the pull rod. The flange plate has an assembly handle portion. The assembly handle portion is provided with a second groove. The second groove is provided with mounting holes matching the radially penetrating holes on the second protruding structure. The second protruding structure is assembled in the second groove and fixed by a connecting member.

[0016] An installation method of a quick-change device for a piston rod of a drilling pump, which is applied to the above-mentioned quick-change device for a piston rod of a drilling pump, includes the following steps: S1. Fabricate the connecting stub. After fabrication, rotate the adjuster to adjust the position of the wedge block so that the first protruding structure and the second protruding structure extend out of the cylinder body synchronously to the outside. S2. Docking and assembling the first groove and the second groove with the first protruding structure and the second protruding structure respectively, aligning the radially penetrating holes with the mounting holes provided on the grooves, and fixing and assembling with a connecting member after alignment. S3. After fixing, rotate the adjuster in the reverse direction, and synchronously contract the first protruding structure and the second protruding structure by adjusting the position of the wedge block so that the end faces where the first groove and the second groove are located match the two end portions of the cylinder body respectively.

[0017] Furthermore, S2 includes the following sub-steps: S21. First, place the first protruding structure into the first groove for docking and assembling, align the radially penetrating holes with the mounting holes provided on the groove, and fix and assemble with a connecting member after alignment. S22. Use the pump discing device to disc the pull rod to the connection position so that the second groove is docked and assembled with the second protruding structure, align the radially penetrating holes with the mounting holes provided on the groove, and fix and assemble with a connecting member after alignment. Or S2 includes the following sub-steps: S21. First, place the second protruding structure into the second groove for docking and assembling, align the radially penetrating holes with the mounting holes provided on the groove, and fix and assemble with a connecting member after alignment. S22. Use the pump discing device to disc the pull rod and the connecting stub to the connection position so that the first groove is docked and assembled with the first protruding structure, align the radially penetrating holes with the mounting holes provided on the groove, and fix and assemble with a connecting member after alignment.

[0018] A quick disassembly method for a quick replacement device of a piston rod of a drilling pump, which is applied to the above-mentioned quick replacement device of a piston rod of a drilling pump, is characterized by including the following steps: S1. Rotate the regulator forward to adjust the position of the wedge block so that the first protruding structure and the second protruding structure synchronously extend to the outside of the cylinder body; S2. Remove the connecting piece and release the connection relationship between the first groove and the first protruding structure and between the second groove and the second protruding structure respectively; S3. Remove the connecting short joint to complete the quick disassembly.

[0019] Further, S2 includes the following sub-steps: S21. First, remove the connecting piece between the first groove and the first protruding structure to release the connection relationship between the piston rod and the connecting short joint; S22. Use the pump disc device to disc the pull rod and the connecting short joint away from the piston rod, remove the connecting piece between the second groove and the second protruding structure, and release the connection relationship between the pull rod and the connecting short joint; Or S2 includes the following sub-steps: S21. First, remove the connecting piece between the second groove and the second protruding structure to release the connection relationship between the pull rod and the connecting short joint; S22. Use the pump disc device to disc the pull rod away from the piston rod, remove the connecting piece between the first groove and the first protruding structure, and release the connection relationship between the piston rod and the connecting short joint.

[0020] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. In terms of structural design, the quick replacement device of the piston rod of the drilling pump of the present invention is different from the design of the traditional piston rod connection structure. In this structure, the connecting short joint is fully utilized to adopt a protruding structure design at both ends to achieve the effect of quick replacement and quick installation. On the one hand, it changes the problem that a large number of components need to be disassembled when disassembling and assembling the piston rod in the current traditional structure design. On the other hand, it solves the problem that when a groove structure design is adopted at one end, three components, namely the cylinder body, the groove part, and the protruding structure, need to be aligned. Especially in this field, the application of this simplest structure solves the technical problems of the industry; 2. A quick replacement device for the piston rod of a drilling pump according to the present invention assembles the pull rod through an assembly structure. In terms of structural design, the flange structure and the structure of the clamp are fully utilized. In specific assembly, the clamp and the flange structure can be connected by bolts. On the basis of quick disassembly and assembly of the piston rod, when maintenance is required, more attention is paid to the maintenance of the assembly structure rather than the maintenance or replacement of the pull rod. In terms of cost, the design of this structure realizes cost reduction by not replacing the pull rod structure, and further achieves the effect of local disassembly to complete operation and maintenance. At the same time, in the structural design, the clamp structure adopted at one end has stronger universality for matching with the pull rod, and the accessories can no longer provide customized pull rods, and can directly replace the piston rods of the sold and in-use pump sets; 3. An installation method for a quick replacement device for the piston rod of a drilling pump according to the present invention, based on the above structure, realizes the effect of shrinkage pre-tightening when the assembly is completed. By adopting this means, it can effectively make the end face of the piston rod assembly, the end face of the pull rod or the assembly structure fit with the cylinder body. By means of this method, when pushing the pull rod, the force-bearing components are only the pull rod, the cylinder body and the piston rod, and the pin shaft and the like do not bear force, and the pin shaft bears force only when retracting. And the force for retracting the piston rod is much smaller than the force for pushing the piston rod, thereby effectively ensuring the service life of the pin shaft. And in actual operation, usually during operation and maintenance, the pin shaft is replaced. On the basis of simpler positioning, the operation and maintenance efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described by way of examples with reference to the accompanying drawings, where: Figure 1 is a schematic structural diagram of Embodiment 1; Figure 2 is a schematic structural diagram of Embodiment 2; Figure 3 is an exploded view of the product structure of Embodiment 2; Figure 4 is a schematic cross-sectional view of the connecting stub; Figure 5 is an assembly schematic diagram of the connecting block; Figure 6 is a schematic diagram of the overall structure in the prior art; Figure 7 is a schematic diagram of the structure in the prior art with segmentation and threaded assembly.

[0022] Reference signs in the drawings: 1 - connecting stub, 101 - cylinder body, 102 - first connecting block, 103 - second connecting block, 104 - wedge block, 105 - regulator, 106 - elastic element, 107 - first protruding structure, 108 - second protruding structure, 2 - pull rod, 3 - piston rod, 4 - clamp, 5 - flange, 6 - first groove, 7 - second groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] All features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0024] Any feature disclosed in this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example in a series of equivalent or similar features.

[0025] Example 1 A quick-change device for the piston rod of a drilling pump, as Figure 1 、 Figure 3 and Figure 4 shown, includes a connecting stub 1 for connecting a pull rod 2 and a piston rod 3. The connecting stub 1 includes a cylinder body 101, and a first connecting block 102 and a second connecting block 103 are arranged in the cylinder body 101; One end of the first connecting block 102 is provided with a first protruding structure 107 for connecting the piston rod 3, and one end of the second connecting block 103 is provided with a second protruding structure 108 for connecting the pull rod 2; A wedge-shaped opening is provided in the middle of the first connecting block 102 and the second connecting block 103. The first connecting block 102 is assembled in the wedge-shaped opening of the second connecting block 103, and the second connecting block 103 is assembled in the wedge-shaped opening of the first connecting block 102. An adjusting device for driving the connecting block to move axially along the cylinder body 101 is further provided between the first connecting block 102 and the second connecting block 103; An elastic element 106 is further provided between the inner side surface of one end of the first connecting block 102 having the first protruding structure 107 and the outer side surface of the other end of the second connecting block 103, and between the inner side surface of one end of the second connecting block 103 having the second protruding structure 108 and the outer side surface of the other end of the first connecting block 102.

[0026] In the design of the above structure, specifically, when compared with the disclosed comparative documents recorded in the background art, the difference in the design of the structure is required to be different from it: First, in the design requirements of this design, protruding structures are provided at both ends of the connecting stub 1. In terms of structure design, it seems that the mutual positions are just swapped, but it should be emphasized that it can be clearly seen from the design of the groove structure in the comparative document that when assembling the hollow cylinder wall where the groove is located, the cylinder body 101 of the stub, and the protruding structure of the pony rod (pull rod 2), all through holes need to be aligned. In actual operation, the difficulty is significantly greater than the alignment of two components; Second, when the public comparative document recycles the bearing block, the acting force is on the pin shaft, and it is also relatively fixed to the cylinder body 101, so there is no possibility of radial displacement; The design of this structure simplifies the operation of aligning and assembling the pin shaft, and improves the assembly efficiency. Secondly, when this application is recycled, although the pin shaft is also stressed, the connecting block can move relative to the cylinder body 101. The pull rod 2 or the connecting stub can be used to move, so that the pull rod 2 or the assembly surface of the assembly structure is attached to the cylinder body 101, thereby avoiding the stress on the pin shaft when the piston rod 3 is pushed, and further improving the service life of the piston rod 3.

[0027] As a further design and description, on the basis of the above, the adjusting device includes a wedge block 104 arranged between the inner side surface of the other end of the first connecting block 102 and the inner side surface of the other end where the second connecting block 103 is assembled, and a regulator 105 for adjusting the movement of the wedge block 104.

[0028] Further, the regulator 105 is a threaded rod. A through hole is provided in the middle of the cylinder body 101. The regulator 105 is rotatably fixedly assembled in the through hole on the cylinder body 101. An internal threaded hole is provided in the wedge block 104. The regulator 105 rotates the regulator 105 to make the wedge block 104 move along the axis of the regulator 105.

[0029] Further, assembly grooves are provided on the outer sides of the ends of the first connecting block 102 and the second connecting block 103 away from the protruding structure. The elastic element 106 is arranged in the assembly grooves and extends out of the assembly grooves. The end portions of the elastic element 106 located outside the assembly grooves are respectively matched with the inner side surfaces of the ends of the first connecting block 102 and the second connecting block 103 where the protruding structure is located.

[0030] Further, the inner side surfaces of the ends of the first connecting block 102 and the second connecting block 103 away from the protruding structure are wedge-shaped surfaces. An opening is formed between the end away from the protruding structure and the end where the protruding structure is located. The first connecting block 102 and the second connecting block 103 are respectively arranged in the opposite openings, and the wedge-shaped surfaces form opposing inner side surfaces for matching with the wedge block 104.

[0031] As a specific implementation manner, in this embodiment, both the first connection block 102 and the second connection block 103 are provided with a first end and a second end, and a connection portion is provided between the first end and the second end. In this design, the end with a protruding structure is set as the first end, and the opposite end is set as the second end. In this structure, the connection portion is used as the bottom, and the first end and the second end are respectively arranged at both ends of the connection portion. An opening is formed with the connection portion as the bottom and the inner sides of the first section and the second end as the side walls. In this structural design, during assembly, the second ends of the first connection block 102 and the second connection block 103 are set in a butted manner in the openings of the opposite connection blocks with the openings facing each other.

[0032] After fitting, in the structural design, the inner side surface of the second end is a wedge surface. After the first connection block 102 and the second connection block 103 are butted and assembled, the inner side surfaces of the second ends of the two connection blocks are arranged opposite to each other, and a wedge block 104 is arranged between the inner side surfaces of the second ends. The length of the wedge block 104 along the screw rod direction is less than the length of the second end along the screw rod direction, so as to realize the movement of the wedge block 104, and further generate a squeezing force to realize extension or provide a recovery space to realize recovery.

[0033] In a further structural design, considering that the movement of the wedge block 104 provides a recovery space when realizing the recovery of the connection block, an elastic element 106 is added to realize automatic recovery and make the connection block retractable. In the design of this structure, the inner side surface of the first end matches the outer side surface of the second end, so as to realize the installation of the elastic element 106. In a specific structural design, preferably, the inner side surface of the first end and the inner side surface of the second end are parallel planes. Of course, on the basis of a large margin, a trapezoidal wedge surface can be formed. Most preferably, the inner side surface of the first end and the outer side surface of the second end are parallel planes in the radial direction. More specifically, an assembly groove is arranged on the outer side surface of the second end or the inner side surface of the first end for installing the elastic element 106 (spring). Preferably, the assembly groove is arranged on the outer side surface of the second end, one end of the elastic element 106 is assembled in the assembly groove, and the other end matches the inner side surface of the first end.

[0034] Based on the above specific structural design, the first protruding structure 107 and the second protruding structure 108 are respectively provided with radially penetrating holes for assembly. In the design of this structure, the simplest structural design method is adopted, that is: the pin assembly method is adopted. In the design of this structure, combined with the above specific structure design, the pin will be subjected to tension when the recovery piston rod 3 is recovered. On the one hand, the service life is long, and on the other hand, in actual operation and maintenance, the pin is more often replaced to achieve high-efficiency disassembly, assembly and operation and maintenance effects.

[0035] A more specific design is that a first groove 6 is provided at the end of the piston rod 3. The first groove 6 is provided with a mounting hole matching the radial through hole on the first protruding structure 107. The first protruding structure 107 is assembled in the first groove 6 and fixed by a connecting piece. Preferably, in this embodiment, a pin hole is used to cooperate with a pin for installation. Of course, in the following structural descriptions, the assembly method of a pin hole and a pin is also used for description. However, in practical applications, a threaded rod can also be used to match a threaded hole, or an installation hole can be used to cooperate with a bolt for assembly, which are all achievable means. And as a preference, the assembly method of a pin hole and a pin is used for installation.

[0036] In this embodiment, a second groove 7 is provided at the end of the pull rod 2. The second groove 7 is provided with a pin hole matching the radial through hole on the second protruding structure 108. The second protruding structure 108 is assembled in the second groove 7 and fixed by pin assembly.

[0037] In the design of this structure, the disclosed patent document recorded in the background technology is effectively changed through the structure design. In the design of this structure, the assembly relationship is in the form of double-component assembly, further realizing the effect of quick disassembly and assembly, which is far superior to the technical effect of the disclosed patent document.

[0038] Embodiment 2 Based on the design of Embodiment 1, the difference from the specific structural design of Embodiment 1 is that in this embodiment, as Figures 2 to 4 shown, an assembly mechanism is provided between the pull rod 2 and the connecting stub 1. The assembly mechanism includes a flange 5 assembled with the connecting stub 1, and a clamp 4 assembled and fixed with the flange 5 for connecting the pull rod 2. The flange 5 has an assembly handle part. The assembly handle part is provided with a second groove 7. The second groove 7 is provided with a pin hole matching the radial through hole on the second protruding structure 108. The second protruding structure 108 is assembled in the second groove 7 and fixed by pin assembly.

[0039] In this embodiment, different from the prior art, the assembly structure of the pull rod 2 section in this structure is completely different. Especially in the design of the protruding structure, it has obvious advantages in terms of assembly effect and efficiency. On the basis of comparing the prior art and Embodiment 1, in the structural design of this embodiment, an assembly structure is adopted to replace the original direct assembly connection method of the pull rod 2 and the connecting stub 1. Instead, a flange 5 structure is used as a transition method. In the case of long-term use, when the pull rod 2 is damaged, the pull rod 2 needs to be replaced. However, in the design of this structure, only the flange 5 needs to be replaced, effectively reducing the corresponding cost. At the same time, because the flange 5 structure is relatively short, when replacing, the disassembly space and components are small, especially for the disassembly and assembly of the cylinder housing structure, further reflecting the technical effect of quick disassembly and assembly.

[0040] Example 3 An installation method of a quick-change device for a piston rod of a drilling pump, which is applied to the quick-change device for a piston rod of a drilling pump described in Embodiment 1 and Embodiment 2, includes the following steps: S1, fabricate the connecting stub 1. After fabrication, rotate the regulator 105 to adjust the position of the wedge block 104, so that the first protruding structure 107 and the second protruding structure 108 simultaneously extend out of the cylinder 101; S2, respectively dock and assemble the first groove 6 and the second groove 7 with the first protruding structure 107 and the second protruding structure 108, align the radially penetrating hole with the pin hole provided on the groove, and use a pin to fix and assemble after alignment; S3, after fixation, rotate the regulator 105 in the reverse direction, and by adjusting the position of the wedge block 104, make the first protruding structure 107 and the second protruding structure 108 contract synchronously, so that the end faces where the first groove 6 and the second groove 7 are located respectively match the two end parts of the cylinder 101.

[0041] In the design of the above specific installation method, as a specific design, step S2 includes the following sub-steps: S21, first place the first protruding structure 107 into the first groove 6 for docking and assembly, align the radially penetrating hole with the installation hole provided on the groove, and use a connecting piece to fix and assemble after alignment; S22, use the pump disc device to turn the pull rod 2 to the connection position, so that the second groove 7 is docked and assembled with the second protruding structure 108, align the radially penetrating hole with the installation hole provided on the groove, and use a connecting piece to fix and assemble after alignment.

[0042] After replacing the specific structure assembly sequence, it is as follows: S21, first place the second protruding structure 108 into the second groove 7 for docking and assembly, align the radially penetrating hole with the installation hole provided on the groove, and use a connecting piece to fix and assemble after alignment; S22, use the pump disc device to turn the pull rod 2 and the connecting stub 1 to the connection position, so that the first groove 6 is docked and assembled with the first protruding structure 107, align the radially penetrating hole with the installation hole provided on the groove, and use a connecting piece to fix and assemble after alignment.

[0043] In the above specific steps and structure design, after the pull rod 2 or the assembly structure and the piston rod 3 are assembled and connected through the connecting stub 1, the assembly end face of the pull rod 2 or the assembly structure and the assembly end face of the piston rod 3 are attached to the two end parts of the cylinder 101. That is: rotate the regulator 105 in the reverse direction, and by adjusting the position of the wedge block 104, make the first protruding structure 107 and the second protruding structure 108 contract synchronously, so that the end faces where the first groove 6 and the second groove 7 are located respectively match the two end parts of the cylinder 101.

[0044] Example 4 A quick-disassembly method for a quick-change device of a piston rod of a drilling pump, which is applied to the quick-change device of the piston rod of a drilling pump described in Embodiments 1 and 2, includes the following steps: S1. Rotate the regulator 105 forward to adjust the position of the wedge block 104, so that the first protruding structure 107 and the second protruding structure 108 synchronously extend to the outside of the cylinder body 101; S2. Take out the connecting piece, and release the connection relationships between the first groove 6 and the first protruding structure 107 and between the second groove 7 and the second protruding structure 108 respectively; S3. Remove the connecting stub 1 to complete the quick disassembly.

[0045] In this structural process, the disassembly method is opposite to the installation method. Through the structural design of the connecting stub 1, not only the assembly efficiency is effectively improved, but further this method effectively solves the disassembly structure, and there is a large improvement in efficiency in terms of operation and maintenance costs.

[0046] Based on the design of the above specific process, further, step S2 includes the following sub-steps: S21. First, take out the connecting piece between the first groove 6 and the first protruding structure 107, and release the connection relationship between the piston rod 3 and the connecting stub 1; S22. Use the disk pump device to disk the pull rod 2 and the connecting stub 1 away from the piston rod 3, take out the connecting piece between the second groove 7 and the second protruding structure 108, and release the connection relationship between the pull rod 2 and the connecting stub 1.

[0047] After the specific structural assembly sequence is replaced, specifically as follows: S21. First, take out the connecting piece between the second groove 7 and the second protruding structure 108, and release the connection relationship between the pull rod 2 and the connecting stub 1; S22. Use the disk pump device to disk the pull rod 2 away from the piston rod 3, take out the connecting piece between the first groove 6 and the first protruding structure 107, and release the connection relationship between the piston rod 3 and the connecting stub 1.

[0048] To sum up: 1. In terms of structural design, the quick-change device of the piston rod of a drilling pump of the present invention is different from the design of the traditional piston rod connection structure. In this structure, the connecting stub is fully utilized to adopt a protruding structure design at both ends to achieve the effect of quick change and quick installation. On the one hand, it changes the problem that a large number of components need to be disassembled when disassembling and assembling the piston rod in the current traditional structural design. On the other hand, it solves the problem that when a groove structure design is adopted at one end, three components of the cylinder body, the groove part, and the protruding structure need to be aligned. Especially in this field, the most simplified structure is applied to solve the technical problems of the industry; 2. A quick-change device for the piston rod of a drilling pump according to the present invention assembles the pull rod through an assembly structure. In terms of structural design, the flange plate structure and the structure of the clamp are fully utilized. In specific assembly, the clamp and the flange plate structure can be bolted. On the basis of the quick disassembly and assembly of the piston rod, when maintenance is required, more attention is paid to the maintenance of the assembly structure, rather than the maintenance or replacement of the pull rod. In terms of cost, the design of this structure realizes cost reduction by not replacing the pull rod structure, and further achieves the effect that local disassembly can complete operation and maintenance. 3. An installation method for a quick-change device for the piston rod of a drilling pump according to the present invention, based on the above structure, realizes the effect of shrinkage pre-tightening when the assembly is completed. By using this means, it can effectively make the end face of the piston rod assembly, the end face of the pull rod or the assembly structure fit with the cylinder body. By means of this method, when the pull rod is pushed, the force-bearing components are only the pull rod, the cylinder body and the piston rod, and the pin shaft and the like do not bear force. Only when the piston rod is retracted does the pin shaft bear force. The force for retracting the piston rod is much smaller than the force for pushing the piston rod, thus effectively ensuring the service life of the pin shaft. And in actual operation, usually during operation and maintenance, the pin shaft is replaced. On the basis of simpler positioning, the operation and maintenance efficiency is greatly improved.

[0049] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A quick-change device for a piston rod of a drilling pump, characterized in that: Comprising a connecting stub for connecting a tie rod and a piston rod, the connecting stub includes a cylinder body, and a first connecting block and a second connecting block are arranged inside the cylinder body; One end of the first connecting block is provided with a first protruding structure for connecting the piston rod, and one end of the second connecting block is provided with a second protruding structure for connecting the tie rod; A wedge-shaped opening is arranged in the middle of the first connecting block and the second connecting block. The first connecting block is assembled in the wedge-shaped opening of the second connecting block, and the second connecting block is assembled in the wedge-shaped opening of the first connecting block. An adjusting device for driving the connecting blocks to move axially along the cylinder body is also arranged between the first connecting block and the second connecting block; Elastic elements are also arranged between the inner side surface of the end of the first connecting block with the first protruding structure and the outer side surface of the other end of the second connecting block, and between the inner side surface of the end of the second connecting block with the second protruding structure and the outer side surface of the other end of the first connecting block.

2. The quick-change device for the piston rod of a drilling pump according to claim 1, characterized in that: The adjusting device includes a wedge block arranged between the inner side surface of the other end of the first connecting block and the inner side surface of the other end where the second connecting block is assembled, and a regulator for adjusting the movement of the wedge block.

3. The quick-change device for the piston rod of a drilling pump according to claim 2, characterized in that: The regulator is a threaded rod. A through hole is arranged in the middle of the cylinder body. The regulator is rotatably and fixedly assembled in the through hole on the cylinder body. An internal threaded hole is arranged in the wedge block, and the regulator makes the wedge block move along the axial direction of the regulator by rotating.

4. A quick-change device for a piston rod of a drilling pump according to claim 1 or 2, characterized in that: Assembly grooves are arranged on the outer sides of the ends of the first connecting block and the second connecting block away from the protruding structures. The elastic elements are arranged in the assembly grooves and extend out of the assembly grooves, and the end parts of the elastic elements located outside the assembly grooves respectively match the inner side surfaces of the ends of the first connecting block and the second connecting block where the protruding structures are located.

5. The quick-change device for the piston rod of a drilling pump according to claim 1, characterized in that: The inner side surfaces of the ends of the first connecting block and the second connecting block away from the protruding structures are wedge-shaped surfaces. An opening is formed between the end away from the protruding structure and the end where the protruding structure is located. The first connecting block and the second connecting block are respectively arranged in the opposite openings, and the wedge-shaped surfaces form opposing inner side surfaces for matching with the wedge block.

6. The quick-change device for the piston rod of a drilling pump according to claim 1, wherein: The first protruding structure and the second protruding structure are respectively provided with radial through holes for assembly.

7. The quick-change device for the piston rod of a drilling pump according to claim 6, characterized in that: A first groove is arranged at the end of the piston rod. The first groove is provided with a mounting hole matching the radial through hole on the first protruding structure. The first protruding structure is assembled in the first groove and is fixedly assembled through a connecting piece.

8. The quick-change device for the piston rod of a drilling pump according to claim 6, characterized in that: A second groove is arranged at the end of the tie rod. The second groove is provided with a mounting hole matching the radial through hole on the second protruding structure. The second protruding structure is assembled in the second groove and is fixedly assembled through a connecting piece.

9. The quick-change device for the piston rod of a drilling pump according to claim 6, wherein: An assembly mechanism is arranged between the tie rod and the connecting stub. The assembly mechanism includes a flange plate assembled with the connecting stub, and a clamp assembled and fixed with the flange plate for connecting the tie rod. The flange plate has an assembly handle part. A second groove is arranged on the assembly handle part. The second groove is provided with a mounting hole matching the radial through hole on the second protruding structure. The second protruding structure is assembled in the second groove and is fixedly assembled through a connecting piece.

10. A method for installing a quick-change device for a piston rod of a drilling pump, which is applied to the quick-change device for a piston rod of a drilling pump according to any one of claims 1-9, and is characterized in that: Including the following steps: S1. Fabricate the connecting short circuit into shape. After shaping, rotate the regulator to adjust the position of the wedge block so that the first protruding structure and the second protruding structure extend out of the cylinder body synchronously to the outside; S2. Docking and assembling the first groove and the second groove with the first protruding structure and the second protruding structure respectively. Align the radial through-hole with the mounting hole provided on the groove, and after alignment, fix and assemble with a connecting piece; S3. After fixing, rotate the regulator in the reverse direction, and by adjusting the position of the wedge block, make the first protruding structure and the second protruding structure contract synchronously, so that the end faces where the first groove and the second groove are located match the two end parts of the cylinder body respectively.

11. The installation method of a quick replacement device for a piston rod of a drilling pump according to claim 10, characterized in that: S2 includes the following sub-steps: S21. First, place the first protruding structure into the first groove for docking and assembling. Align the radial through-hole with the mounting hole provided on the groove, and after alignment, fix and assemble with a connecting piece; S22. Use the disc pump device to wind the pull rod to the connection position, so that the second groove is docked and assembled with the second protruding structure. Align the radial through-hole with the mounting hole provided on the groove, and after alignment, fix and assemble with a connecting piece; Or S2 includes the following sub-steps: S21. First, place the second protruding structure into the second groove for docking and assembling. Align the radial through-hole with the mounting hole provided on the groove, and after alignment, fix and assemble with a connecting piece; S22. Use the disc pump device to wind the pull rod and the connecting short circuit to the connection position, so that the first groove is docked and assembled with the first protruding structure. Align the radial through-hole with the mounting hole provided on the groove, and after alignment, fix and assemble with a connecting piece.

12. A quick-disassembly method for a quick-change device of a piston rod of a drilling pump, which is applied to the quick-change device of a piston rod of a drilling pump according to any one of claims 1-9, and is characterized in that: It includes the following steps: S1. Rotate the regulator forward to adjust the position of the wedge block so that the first protruding structure and the second protruding structure extend out of the cylinder body synchronously to the outside; S2. Take out the connecting piece and release the connection relationship between the first groove and the first protruding structure and between the second groove and the second protruding structure respectively; S3. Demount the connecting short circuit to complete the quick disassembly.

13. The quick-disassembly method of the quick-change device for the piston rod of a drilling pump according to claim 12, characterized in that: S2 includes the following sub-steps: S21. First, take out the connecting piece between the first groove and the first protruding structure and release the connection relationship between the piston rod and the connecting short circuit; S22. Use the disc pump device to wind the pull rod and the connecting short circuit away from the piston rod, take out the connecting piece between the second groove and the second protruding structure, and release the connection relationship between the pull rod and the connecting short circuit; Or S2 includes the following sub-steps: S21. First, take out the connecting piece between the second groove and the second protruding structure and release the connection relationship between the pull rod and the connecting short circuit; S22. Use the disc pump device to wind the pull rod away from the piston rod, take out the connecting piece between the first groove and the first protruding structure, and release the connection relationship between the piston rod and the connecting short circuit.

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