Cover plate of crank pin assembly of oil pumping unit and crank pin assembly

Abstract

The utility model relates to a pumping unit crank pin assembly cover plate and a crank pin assembly, and belongs to the technical field of beam-pumping unit machinery. Comprising a cover plate body used for being connected to an opening of a crank pin in a buckled mode, a window hole with the size smaller than that of the opening is formed in the middle of the cover plate body, and a window cover used for sealing the window hole is arranged on the window hole. According to the scheme, the problems of complicated operation, long production time and low working efficiency during maintenance of the crank pin in the prior art are solved. Meanwhile, the size of the maintenance window is smaller than that of the crank pin opening and is located in the middle, when the maintenance window is opened, the annular part, surrounding the maintenance window, of the cover plate body blocks grease and is used for attaching the grease, grease overflowing can be avoided, grease is injected to the back of the annular part from the maintenance window, and grease overflowing can also be avoided; meanwhile, the butter can be prevented from being polluted by the environment to a certain extent.

Description

Technical Field

[0001] The utility model relates to a crank pin assembly cover plate of an oil pumping unit and a crank pin assembly, belonging to the technical field of beam pumping unit machinery. Background Art

[0002] The crank pin is a key component of the beam pumping unit used in oilfield development. During the long-term operation of the equipment, the pumping unit needs to be repaired and maintained, especially the crank pin. The repair and maintenance mainly includes disassembling the crank pin assembly cover, checking the lubrication of the internal bearing, checking the tightness of the bearing cover screws, and filling grease. On the one hand, the crank pin assembly cover of the pumping unit can store grease to ensure that the crank pin bearing is effectively lubricated. On the other hand, it has the key role of fixing the bearing and preventing dust and rain from eroding the internal components. The existing crank pin assembly cover is a metal whole, which is large and heavy. When maintaining the equipment, two people are required to remove all the fixing screws, disassemble the crank pin assembly cover with special tools, and then conduct internal inspection and fill grease. The operation is difficult, the operation takes a long time, and the work efficiency is low.

[0003] The Chinese utility model patent authorization publication document with announcement number CN211648766U discloses a screw-on crank pin end cover and crank pin assembly. The screw-on crank pin end cover includes: a cylindrical end cover body; one end of the end cover body is closed and the other end is open; a clip is arranged on the outer periphery of the open end of the end cover body; and a striking piece is arranged on the outer periphery of the closed end of the end cover body. The scheme arranges a clip on the end cover body so that the crank pin and the crank pin end cover can be connected by a clip instead of a bolt connection, which can be conveniently and quickly disassembled. At the same time, in order to ensure the sealing by clamping and fastening, the scheme needs to achieve the clamping and disassembly of the cover body by hammering the striking piece. On the one hand, the hammer is needed to achieve the disassembly work. On the other hand, the surface of the striking piece will be relatively slippery in rainy, snowy and icy weather. When the hammer is used to hammer the striking piece, it is easy to slip, which increases the difficulty of disassembly work. At the same time, the striking will also cause damage to the cover body due to improper operation.

[0004] The Chinese utility model patent authorization publication document with announcement number CN201620832U discloses a crank pin threaded cover for a pumping unit that can achieve rapid maintenance. The flange cap in this solution is fastened to the crank pin opening by bolts. As the base of the threaded cover, an axial through hole is formed in the middle of the flange cap. The threaded cover is connected to the through hole by threads to achieve sealing coverage of the through hole. The through hole in the middle of the flange cap in this solution is formed by a hollow round tube. The outer wall of the round tube has a circle of flanges to form a flange for passing bolts. In this solution, the crank pin opening is closed by the threaded cover, and it is more convenient and quick to open and close the threaded cover when the crank pin is maintained. However, the threaded cover in this solution has the same radial size as the round tube and is close to the flange size of the flange cap, which causes the butter accumulated in the crank pin in the round tube to easily flow out when the threaded cover is opened, or to be contaminated by the external environment, which adds trouble to the operation and maintenance work. Utility Model Content

[0005] The utility model aims to provide a crank pin assembly cover plate and a crank pin assembly for an oil pumping unit, so as to solve the problem in the prior art that butter is easy to flow out and be contaminated when the crank pin is opened for inspection and maintenance.

[0006] To achieve the above purpose, the solution of the utility model includes:

[0007] The utility model discloses a technical solution for a cover plate of a crank pin assembly of an oil pump, comprising a cover plate body for buckling on an opening of a crank pin, a window hole smaller than the opening is provided in the middle of the cover plate body, and a window cover for closing the window hole is provided on the window hole.

[0008] The utility model improves the existing technology, and opens an inspection window on the cover plate body. The crank pin can be inspected and maintained by opening the window cover on the inspection window. There is no need to disassemble the crank pin assembly cover plate, and internal inspection and butter filling can be completed, which reduces the difficulty of maintenance and repair operations, shortens the operation and maintenance time, and improves work efficiency. At the same time, the inspection window is smaller than the crank pin opening and is located in the middle. When the inspection window is opened, the annular part of the cover plate body surrounding the inspection window forms a barrier to the butter, which is used to attach the butter and prevent the butter from overflowing. Filling the butter from the inspection window to the back of the annular part can also prevent the butter from overflowing; at the same time, it can also prevent the butter from being polluted by the environment to a certain extent.

[0009] Furthermore, the area where the window hole is located on the cover plate body protrudes in a direction away from the crank pin to form a space for accommodating butter.

[0010] The space protruding outwards of the cover body forms a butter reservoir for accommodating butter, thereby ensuring lubrication of the internal parts on one side of the cover.

[0011] Furthermore, in order to save butter and avoid accommodating too much butter without lubricating effect in the corners, the area where the window hole is located is smaller than the size of the crank pin opening, forming a truncated cone-shaped space.

[0012] Furthermore, in order to simultaneously play the role of positioning the bearing, the cover plate body is formed with a ring platform for positioning the bearing extending into the crank pin opening in the direction of the crank pin.

[0013] Furthermore, in order to achieve the purpose of rapid installation and disassembly, the cover plate body and the window cover are connected via threads.

[0014] Furthermore, in order to facilitate manual disassembly, a window cover disassembly handle for rotating the window cover is provided on the outer side of the window cover.

[0015] Furthermore, the window cover is provided with an outer flange in the circumference thereof; and the edge of the window opening forms a step surface matching the outer flange of the window cover.

[0016] Furthermore, a rubber sealing ring installed in an annular groove is provided between the annular surface where the outer flange contacts the step surface.

[0017] The outer flange of the window cover, the step surface of the window hole and the rubber sealing ring constitute a sealing structure, which can effectively prevent rainwater from eroding internal components, play a good sealing and protective role, and can also prevent dust, sand and gravel from entering the internal components and causing damage to the internal components.

[0018] Furthermore, the cover plate body is connected to the crank pin through a flange formed by an outer peripheral flange.

[0019] Furthermore, the cover plate body is a cover plate made of plastic steel.

[0020] The cover is made of plastic steel, which is light in weight and can be operated by one person. During maintenance, no special tools are needed. The quick inspection window can be removed by hand to check the fixing screws of the internal bearing cover and add grease. The operation is convenient.

[0021] The utility model discloses a crank pin assembly for an oil pumping unit, and the crank pin assembly comprises the crank pin assembly cover plate for the oil pumping unit described in any one of the above items. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a top view of a cover plate structure of a crank pin assembly of an oil pumping unit of the utility model;

[0023] Figure 2 This is a side view of a cover plate structure of a crank pin assembly of an oil pumping unit of the utility model;

[0024] In the figure: 1. Cover body; 2. Fixing screw hole; 3. Bearing positioning ring; 4. Quick inspection window cover; 5. Connecting thread; 6. Rubber sealing ring; 7. Grease duct; 8. Window cover disassembly and assembly handle; 9. Window hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] The concept of the utility model is that a window hole smaller than the crank pin opening is provided in the middle of the crank pin assembly cover plate, so that when the window hole is opened, an annular baffle formed by the annular portion outside the window hole of the crank pin assembly cover plate is formed on the crank pin opening, so as to prevent the butter inside the crank pin from flowing out of the window hole or contaminating the butter inside the crank pin when the crank pin opening is quickly opened for inspection or oil replenishment by means of the window hole cover plate (window cover).

[0027] An embodiment of a crank pin assembly cover plate of an oil pumping unit:

[0028] like Figure 1 and Figure 2 The illustrated example is a pumping unit crank pin assembly cover plate, comprising a cover plate body 1, a window hole 9 being axially opened on the cover plate body 1, a quick inspection window cover 4 being provided at the end of the window hole 9 away from the crank pin, and a window cover disassembly handle 8 being provided on the outer side of the quick inspection window cover 4; the cover plate body 1 and the quick inspection window cover 4 are threadedly connected via a connecting thread 5.

[0029] The outer edge of the quick inspection window cover 4 is provided with an outer flange, and the inner circumference of the end of the window hole 9 away from the crank pin is provided with an annular step surface matching the outer flange of the quick inspection window cover 4; an annular groove is provided on the annular step surface, and a rubber sealing ring 6 is provided in the annular groove. The rubber sealing ring 6 is squeezed between the outer flange of the quick inspection window cover 4 and the annular step surface to form a seal to prevent grease leakage and dust from entering. A circle of annular platforms extending into the crank pin opening is formed at the end of the cover body 1 close to the crank pin, which serves as a bearing positioning ring 3.

[0030] The portion of the cover plate body 1 where the quick inspection window cover 4 is located protrudes in a direction away from the crank pin to form a space for accommodating butter, and the space structure serves as a butter culvert.

[0031] More specifically, the utility model provides a cover plate for a crank pin assembly of an oil pump, comprising a cover plate body 1 made of plastic steel with a diameter of 350 mm and a body thickness of 12 mm, 8 cover plate fixing screw holes 2 with a diameter of 18 mm for fixing the main cover plate, and a 260 mm diameter positioning ring 3 for positioning the crank pin bearing; a quick inspection window cover 4, connected to the cover plate body 1 by a thread 5, a rubber sealing ring 6 with a diameter of 116 and a thickness of 3.5 mm is arranged between the cover plate body 1 and the quick inspection window cover to prevent the added butter from overflowing, a space protruding from the cover plate body 1 in a direction away from the crank pin forms a butter jar 7 with a capacity of 2.03 L, and a disassembly handle 8 is provided on the quick inspection window cover 4 for disassembling and assembling the inspection window cover, checking the bearings, fixing screws, and adding butter.

[0032] When using the utility model, place the cover body 1 into the crank pin assembly, insert a fixing screw with a diameter of 18 mm into the fixing screw hole 2 and tighten it diagonally, insert a rubber sealing ring 6 with a diameter of 116 mm and a thickness of 3.5 mm into the sealing ring groove of the cover body 1, tighten the quick inspection window cover 4 to complete the installation of the utility model.

[0033] During routine maintenance, only the disassembly and assembly handle 8 of the utility model needs to be twisted by hand to remove the quick inspection window cover 4, check the crank pin bearing, the bearing cover plate fixing screws, add butter, etc., and then install the quick inspection window cover 4 to resume equipment operation.

[0034] The utility model discloses a quick-detachable oil pump crank pin assembly cover plate, which is made of plastic steel, has low cost, is corrosion-resistant, anti-aging, light weight, and is simple to install, repair and maintain. It can be operated by one person, solving the problems of heavy and expensive original steel cover plates, difficult disassembly and assembly, and long maintenance time. In addition to the development function characteristics, the utility model also retains the use function of the original oil pump crank pin cover plate, and does not require special tools. When in use, the quick inspection window cover can be unscrewed by hand to carry out inspection and add butter, which reduces the maintenance time of the oil pump equipment, saves maintenance costs, and has the characteristic of being used in conjunction with existing oil pump equipment.

[0035] An embodiment of a crank pin assembly of an oil pumping unit:

[0036] This embodiment provides a crank pin assembly of an oil pumping unit, including a crank pin assembly cover plate of the oil pumping unit. Figure 1 Insert a fixing screw with a diameter of 18 mm into the fixing screw hole 2 shown and tighten it diagonally to complete the installation of the utility model. A pumping unit crank pin assembly cover plate of this embodiment has been clearly introduced in the previous assembly cover plate embodiment and will not be repeated here.

Claims

1. A cover plate for a crank pin assembly of an oil pumping unit, characterized in that: It comprises a cover plate body (1) for buckling onto a crank pin opening, a window hole (9) smaller than the opening is provided in the middle of the cover plate body (1), and a window cover (4) for closing the window hole is provided on the window hole (9).

2. The crank pin assembly cover plate of the oil pumping unit according to claim 1, characterized in that: The area where the window hole (9) is located on the cover plate body (1) protrudes in a direction away from the crank pin to form a space for accommodating butter.

3. The crank pin assembly cover plate of the oil pumping unit according to claim 2, characterized in that: The area where the window hole (9) is located is smaller than the size of the crank pin opening, forming a truncated cone-shaped space.

4. The crank pin assembly cover plate of the oil pumping unit according to claim 1, characterized in that: The cover plate body (1) is formed toward the crank pin to form a ring platform extending into the crank pin opening for positioning the bearing.

5. The crank pin assembly cover plate of the oil pumping unit according to claim 1, characterized in that: The cover plate body (1) is connected to the window cover (4) via threads.

6. The crank pin assembly cover plate of the oil pumping unit according to claim 5, characterized in that: A window cover disassembly handle (8) for rotating the window cover is provided on the outer side of the window cover (4).

7. The crank pin assembly cover plate of the oil pumping unit according to claim 1, characterized in that: The window cover (4) is provided with an outer flange in the circumferential direction; the opening edge of the window hole (9) forms a step surface matching the outer flange of the window cover (4).

8. The crank pin assembly cover plate of the oil pumping unit according to claim 7, characterized in that: A rubber sealing ring (6) installed in an annular groove is provided between the annular surface where the outer flange and the step surface contact each other.

9. The crank pin assembly cover plate of the oil pumping unit according to claim 1, characterized in that: The cover plate body (1) is connected to the crank pin via a flange formed by an outer peripheral flange.

10. A crank pin assembly of an oil pump, characterized in that: It comprises the crank pin assembly cover plate of the oil pumping unit as described in any one of claims 1 to 9.

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