CN221054106U - Anti-back-out device for crank pin assembly of oil pumping unit - Google Patents
Anti-back-out device for crank pin assembly of oil pumping unit Download PDFInfo
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- CN221054106U CN221054106U CN202322624114.0U CN202322624114U CN221054106U CN 221054106 U CN221054106 U CN 221054106U CN 202322624114 U CN202322624114 U CN 202322624114U CN 221054106 U CN221054106 U CN 221054106U
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- 238000005086 pumping Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000007123 defense Effects 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The utility model discloses an anti-back-out device of a crank pin assembly of an oil pumping unit, which comprises a crank pin, wherein the crank pin is provided with a free end, a first section and a second section are sequentially formed on the crank pin along the direction away from the free end, external threads with the threads in opposite directions are arranged on the outer side walls of the first section and the second section, the external threads of the second section are matched with the internal threads of a crown nut sleeved on the outer side of the second section, the external threads of the first section are matched with the internal threads of a spare nut sleeved on the outer side of the first section, and the bottom end face of the spare nut facing the crown nut is abutted to the top end face of the spare nut facing the spare nut. When the crown nut is used, the crown nut is tightened first and then the backup nut is tightened, when the crown nut is unscrewed, the backup nut which is reversely buckled with the crown nut rotates synchronously with the crown nut, and the backup nut is rotated more and more tightly against the crown nut, so that the crank pin is prevented from unscrewing.
Description
Technical Field
The utility model relates to the technical field of anti-back-out devices of crank pins of pumping units, in particular to an anti-back-out device of a crank pin assembly of a pumping unit.
Background
The method for preventing the crank pin of the 14-type and 16-type beam pumping unit commonly used by northwest oilfield companies from being unlocked adopts baffle bolts for fixation, more common pumping unit accidents are mostly crown type screw cap loosening, finally the crank pin is separated from the accident, a light person is damaged by a single arm, a beam is damaged, a heavy person turns over the pumping unit, and a well head is seriously damaged, so that well control events are caused. The safety line (crown nut and pin end face are in a straight line) is usually drawn, and whether the safety line is flush or not is observed during inspection, dislocation is avoided, and machine halt inspection is carried out if necessary. In recent years, in the field, the pumping unit often has the occurrence of outward movement of the crank pin bearing due to the fact that a fixed bolt of a baffle plate of the crank pin bearing is twisted off.
The crank pin is a key connecting component of the pumping unit and is a weak link. The transmission connection of the crank and the connecting rod is completed through a crank pin assembly. The crank pin assembly is fixed on the crank through a crown nut and a backup cap (baffle). As the pumping unit is subjected to a large alternating load. Therefore, the crown nut and the backup cap (baffle) as the parts subjected to the alternating load are liable to be buckled. In field application, because the screw thread direction of crown nut and backup cap is unanimous, therefore once crown nut becomes flexible and moves back the knot, backup cap and crown nut tend to take place simultaneously under the effect of circumference force and move back the knot, finally lead to the crank pin to deviate from, lead to the connecting rod to warp, tail shaft, the damage of axis, cause the beam-pumping unit to turn over the machine when serious, smash oil recovery wellhead equipment, cause oil gas leakage, pollute, endanger operating personnel personal safety.
Therefore, how to provide an anti-back-out device for a crank pin assembly of an oil pumping unit, which can avoid the above-mentioned drawbacks, is an urgent problem to be solved.
Disclosure of Invention
The utility model aims at solving the technical problems that the anti-back-out device of the crank pin assembly of the pumping unit is developed aiming at the reasons of back-out of the crank pin and outward-shifting of the bearing of the pumping unit, so that the failure of back-out of the crank pin and outward-shifting of the bearing can be effectively prevented, single-arm damage and beam damage caused by back-out of the crank pin and outward-shifting of the bearing can be avoided, and even well control hazards and safety hazards such as side turning of the pumping unit, breaking of oil extraction wellhead equipment and the like can be avoided. The specific technical scheme is as follows:
The utility model provides a beam-pumping unit crank pin assembly prevents moving back knot device, includes crank pin, its has the free end, along keeping away from this crank pin of direction of free end has formed in proper order first section and second section, first section with the lateral wall of second section is provided with the external screw thread of screw thread for opposite direction, the internal screw thread of a crown nut in the outside of this second section is established to the external screw thread cooperation cover of second section, the internal screw thread of the equipment nut in the outside of this first section is established to the external screw thread cooperation cover of first section, equipment nut orientation crown nut's bottom face butt to this crown nut orientation equipment nut's top end face.
Preferably, the end of the first section remote from the second section is the free end.
Preferably, the crank pin is provided with a plug hole, the plug hole extends along the axial direction of the crank pin and penetrates through the free end, plug internal threads are arranged in the plug hole, the crank pin further comprises screws, the number of the screws is the same as that of the plug holes, each screw is provided with plug external threads matched with the plug internal threads, the free end of each screw is plugged in the plug hole, and a screw head limiting structure is arranged at the position of each screw head, corresponding to the top end of each screw, of each spare screw cap.
Preferably, the backup nut comprises a small-diameter threaded section and a large-diameter cavity section which are connected, a cavity of the small-diameter threaded section is communicated with a cavity of the large-diameter cavity section, the small-diameter threaded section is close to the crown nut, an internal thread of the backup nut is arranged on the inner side of the small-diameter threaded section, the inner diameter of the large-diameter cavity section is larger than that of the small-diameter thread, a first inner step is formed at the joint of the small-diameter threaded section and the large-diameter cavity section, the backup nut further comprises a backing plate, the backing plate is abutted to the first inner step, the backing plate forms a screw head limiting structure, and a plurality of through holes with the number equal to that of screws are formed in the backing plate.
Preferably, the number of the through holes formed in the backing plate is three, and the three through holes are respectively positioned at three vertexes of a triangle.
Preferably, the diameter of the first section is smaller than the diameter of the second section.
Preferably, the crown nut is concave towards one side of the spare nut to form a concave cavity, the inner diameter of the concave cavity is larger than the inner diameter of the internal thread of the crown nut, a second inner step is formed at the joint of the crown nut and the internal thread, and the bottom end surface of the spare nut is abutted to the second inner step.
The provided device has the technical effects that:
When the crown nut is used, the crown nut is tightened first and then the backup nut is tightened, when the crown nut is unscrewed, the backup nut which is reversely buckled with the crown nut rotates synchronously with the crown nut, and the backup nut is rotated more and more tightly against the crown nut, so that the crank pin is prevented from unscrewing. The crank pin can be prevented from being buckled, so that the outward movement of the bearing is avoided, the side-turning risk is effectively avoided, and the safe and stable operation of the pumping unit is ensured. The service life of the equipment is prolonged to the maximum extent while ensuring the safe and stable production of the oil well. The passive defense is changed into active defense, so that potential safety hazards are thoroughly eliminated from the source, and the phenomenon that the pumping unit turns over is avoided; the occurrence of well control events and large-area environmental pollution well control accidents caused by damage to wellhead equipment due to side-turning damage of the oil pumping unit and wellhead is avoided; ensuring the safe and stable operation of the oil well and improving the production time efficiency; the service life of the pumping unit is prolonged, and the production cost is saved.
Preferably, the plug hole and the screw are arranged, so that the force for combining the nut to the crank pin is further enhanced.
Preferably, the diameter of the first section is smaller than that of the second section, so that the thickness of the spare nut can be increased as much as possible in a limited space, and the strength of the spare nut is improved.
Drawings
Fig. 1 is a schematic structural view of an embodiment of an anti-back-out device for a crank pin assembly of an oil pumping unit.
The reference numerals in fig. 1 are as follows:
The novel high-speed gear comprises a crank, a crank pin, a first section 3, a second section 4, a crown nut 5, a backup nut 6, a screw rod 7, a small-diameter threaded section 8, a large-diameter cavity section 9, a backing plate 10 and a second inner step 11.
Detailed Description
The present utility model will be described in further detail below.
The present utility model will be described in more detail below with reference to the attached drawings, in which preferred embodiments of the present utility model are shown, it being understood that one skilled in the art can modify the present utility model described herein while still achieving the beneficial effects of the present utility model. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the utility model.
In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions or constructions are not described in detail since they would obscure the utility model in unnecessary detail. It will be appreciated that in the development of any such actual embodiment, numerous implementation details must be made in order to achieve the developer's specific goals.
In order to make the objects and features of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the drawings are in a very simplified form and all employ non-precise ratios, and are merely convenient and clear to aid in the description of the embodiments of the utility model.
Referring to fig. 1, a schematic structural diagram of an embodiment of an anti-back-out device for a crank pin assembly of an oil pumping unit according to the present utility model is shown.
In a specific embodiment, as shown in fig. 1, an anti-unscrewing device of a crank pin assembly of an oil pumping unit comprises a crank pin 2, wherein the crank pin 2 is connected to a crank 1 and provided with a free end, a first section 3 and a second section 4 are sequentially formed on the crank pin 2 along a direction away from the free end, external threads with opposite directions are arranged on the outer side walls of the first section 3 and the second section 4, an internal thread of a crown nut 5 outside the second section 4 is sleeved on the external thread of the second section 4 in a threaded fit manner, an internal thread of a backup nut 6 outside the first section 3 is sleeved on the external thread of the backup nut 3 in a threaded fit manner, and the backup nut 6 faces towards the bottom end surface of the crown nut 5 to the top end surface of the backup nut 6 in a abutting manner.
When the crown nut 5 is tightened and then the backup nut 6 is tightened, the backup nut 6 reversely buckled with the crown nut 5 rotates synchronously when the crown nut 5 is buckled, and the backup nut 6 rotates more and more tightly against the crown nut 5, so that the function of preventing the crank pin 2 from buckling is achieved. The crank pin 2 can be prevented from being buckled, so that the outward movement of the bearing is avoided, the side-turning risk is effectively avoided, and the safe and stable operation of the pumping unit is ensured. The service life of the equipment is prolonged to the maximum extent while ensuring the safe and stable production of the oil well. The passive defense is changed into active defense, so that potential safety hazards are thoroughly eliminated from the source, and the phenomenon that the pumping unit turns over is avoided; the occurrence of well control events and large-area environmental pollution well control accidents caused by damage to wellhead equipment due to side-turning damage of the oil pumping unit and wellhead is avoided; ensuring the safe and stable operation of the oil well and improving the production time efficiency; the service life of the pumping unit is prolonged, and the production cost is saved.
In one embodiment, as shown in fig. 1, the end of the first section 3 away from the second section 4 is the free end.
Further, set up the spliced eye on the crank pin 2, this spliced eye is followed the axial direction of crank pin 2 extends and runs through to the free end, be provided with grafting internal thread in the spliced eye, still include the quantity the same as the screw rod 7 of spliced eye, set up the grafting external screw thread that matches grafting internal thread on every screw rod 7, every the free end of screw rod 7 all peg graft in the spliced eye, be provided with screw rod head limit structure in the position department of the screw rod head that is equipped with nut 6 corresponds every screw rod 7's top.
The plug holes and the screw rods 7 are arranged to further strengthen the force of the nut 6 to be combined with the crank pin 2.
In one embodiment, as shown in fig. 1, the backup nut 6 includes a small-diameter threaded section 8 and a large-diameter hollow section 9 that are connected, the cavity of the small-diameter threaded section 8 is communicated with the cavity of the large-diameter hollow section 9, the small-diameter threaded section 8 is close to the crown nut 5, the inner side of the small-diameter threaded section is provided with an internal thread of the backup nut 6, the inner diameter of the large-diameter hollow section 9 is larger than the inner diameter of the small-diameter threaded section 8, a first inner step is formed at the joint of the small-diameter threaded section and the small-diameter threaded section, and the backup nut further includes a backing plate 10, the backing plate 10 is abutted to the first inner step, the backing plate 10 forms a screw head limiting structure, and a plurality of through holes with the same number as the screw 7 are formed on the backing plate 10.
The number of through holes formed in the pad 10 is three, and the three through holes are respectively located at three vertexes of a triangle.
In a specific embodiment, the diameter of the first section 3 is smaller than the diameter of the second section 4.
The diameter of the first section 3 is limited to be smaller than that of the second section 4, so that the thickness of the spare nut 6 can be increased as much as possible in a limited space, and the strength of the spare nut is improved.
In one embodiment, as shown in fig. 1, a side of the crown nut 5 facing the backup nut 6 is concaved to form a concave cavity, the inner diameter of the concave cavity is larger than the inner diameter of the crown nut 5 where the internal thread is provided, a second inner step 11 is formed at the junction of the crown nut 5 and the concave cavity, and the bottom end surface of the backup nut 6 abuts against the second inner step 11.
The foregoing has outlined and described the basic principles, features, and advantages of the present utility model in order that the description that follows is merely an example of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, but rather that the foregoing embodiments and description illustrate only the principles of the utility model, and that the utility model is susceptible to various equivalent changes and modifications without departing from the spirit and scope of the utility model, all of which are intended to be within the scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and their equivalents.
Claims (7)
1. The utility model provides a beam-pumping unit crank pin assembly prevents moving back knot device, its characterized in that, including crank pin, it has the free end, along keeping away from this crank pin of direction of free end has first section and second section in proper order, first section with the lateral wall of second section is provided with the external screw thread of screw thread for opposite direction, the internal thread of a crown nut in the outside of this second section is established to the external screw thread screw-thread fit cover of second section, the internal thread of the backup nut in the outside of this first section is established to the external screw-thread fit cover of first section, backup nut orientation crown nut's bottom face butt to this crown nut orientation backup nut's top end face.
2. The anti-back-out device of claim 1, wherein the end of the first section remote from the second section is the free end.
3. The anti-back-out device for the crank pin assembly of the pumping unit according to claim 2, wherein the crank pin is provided with a plug hole, the plug hole extends along the axial direction of the crank pin and penetrates through the free end, plug internal threads are arranged in the plug hole, the anti-back-out device further comprises screws, the number of the screws is the same as that of the plug holes, each screw is provided with plug external threads matched with the plug internal threads, the free end of each screw is plugged in the plug hole, and a screw head limiting structure is arranged at the position of the screw head, corresponding to the top end of each screw, of the spare screw cap.
4. The anti-back-out device for the crank pin assembly of the pumping unit according to claim 3, wherein the backup nut comprises a small-diameter threaded section and a large-diameter cavity section which are connected, the cavity of the small-diameter threaded section is communicated with the cavity of the large-diameter cavity section, the small-diameter threaded section is close to the crown nut, the inner side of the small-diameter threaded section is provided with an internal thread of the backup nut, the inner diameter of the large-diameter cavity section is larger than that of the small-diameter thread, a first inner step is formed at the joint of the small-diameter threaded section and the large-diameter cavity section, the backup nut further comprises a backing plate which is abutted to the first inner step, the backing plate forms a screw head limiting structure, and a plurality of through holes with the number equal to that of the screws are formed on the backing plate.
5. The anti-back-out device of claim 4, wherein the number of through holes formed in the pad is three, and the three through holes are respectively located at three vertices of a triangle.
6. The anti-back-out apparatus of claim 5, wherein the diameter of the first section is smaller than the diameter of the second section.
7. The anti-back-out device of the pumping unit crank pin assembly according to claim 6, wherein one side of the crown nut facing the backup nut is concaved inwards to form a concave cavity, the inner diameter of the concave cavity is larger than the inner diameter of the crown nut where the internal thread is arranged, a second inner step is formed at the joint of the crown nut and the concave cavity, and the bottom end surface of the backup nut is abutted to the second inner step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023223472957 | 2023-08-30 | ||
| CN202322347295 | 2023-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221054106U true CN221054106U (en) | 2024-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322624114.0U Active CN221054106U (en) | 2023-08-30 | 2023-09-26 | Anti-back-out device for crank pin assembly of oil pumping unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221054106U (en) |
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2023
- 2023-09-26 CN CN202322624114.0U patent/CN221054106U/en active Active
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