Position adjusting device for crank pin of oil pumping unit

Abstract

A position adjusting device for a crank pin of an oil pumping unit relates to the technical field of oil pumping unit maintenance devices and comprises a pull rod and a jack. The pull rod is mounted at the rear ends of the two cranks to prevent the two cranks from being separated from each other; the jack is located between the two crank pins, the front end and the rear end of the jack are each fixedly connected with an ejector rod, and the ejector rods abut against the crank pins; the outer sides of the ejector rods are slidably sleeved with sliding sleeves respectively, a U-shaped clamping head is fixedly connected to the side, close to the crank pin, of the sliding sleeve, a clamping opening of the U-shaped clamping head is clamped on the crank, the upper side and the lower side of the U-shaped clamping head are each provided with a puller bolt, and the puller bolts abut against the upper side and the lower side of the crank respectively after being screwed tightly. The height of the U-shaped clamping head relative to the crank is adjusted by adjusting the ejection length of the two puller bolts. The utility model solves the problem that the jack needs to be lifted by personnel and is laborious, and reduces the fatigue degree of the personnel.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil pumping unit maintenance devices, in particular to a crank pin position adjustment device for an oil pumping unit. Background Art

[0002] Since the stroke of the oil pumping unit is adjusted during oil field production, the crank pin needs to be disassembled and replaced when it is damaged. During the disassembly process, a sledgehammer is usually used. It is difficult to knock down the crank pin of larger oil pumping units such as the Type 4, Type 16, and the old-style Type 10. In addition, using a sledgehammer to disassemble the crank pin can easily damage the crank pin shaft, causing serious economic losses, delaying the startup time, and affecting the operating rate of the oil pumping unit.

[0003] To address the aforementioned issues, Patent Publication No. CN2642466Y discloses a hydraulic pumping unit crankpin removal device. This patent employs a jack positioned between two crankpins and a pull rod connected between the two cranks to prevent them from separating. Using a single jack, both crankpins are simultaneously ejected, eliminating the need for a sledgehammer and significantly improving efficiency. However, the aforementioned patent still suffers from the requirement for a person to lift the jack, which is physically demanding for someone working near the pumping unit. Lifting the jack is also exhausting. Utility Model Content

[0004] In order to overcome the problem of fatigue caused by lifting a jack, the utility model discloses a pumping unit crank pin position adjustment device which is free of lifting and easy to install.

[0005] The technical solution provided by the utility model is: a device for adjusting the position of a crank pin of an oil pumping unit, comprising a pull rod and a jack; the pull rod is installed at the rear ends of the two cranks to prevent the two cranks from separating from each other; the jack is located between the two crank pins, and the front end and the rear end of the jack are respectively fixedly connected to a push rod, and the push rods are pressed against the crank pins; sliding sleeves are respectively provided on the outer sides of the push rods, and a U-shaped clamp is fixed on the sliding sleeve close to the crank pin side, and the bayonet of the U-shaped clamp is clamped on the crank, and a tightening bolt is respectively provided on the upper side and the lower side of the U-shaped clamp, which are respectively pressed against the upper side and the lower side of the crank after being tightened, and the height of the U-shaped clamp relative to the crank is adjusted by adjusting the ejection length of the two tightening bolts.

[0006] A further technical solution is that a spring is provided between the sliding sleeve and the jack, and under the elastic force of the spring, the sliding sleeve has a movement tendency close to the crank, thereby ensuring that the U-shaped clamp does not fall off the crank.

[0007] A further technical solution is that a limiting top screw is screwed radially onto the sliding sleeve, and the limiting top screw abuts against the push rod, thereby limiting the sliding of the sliding sleeve relative to the push rod.

[0008] A further technical solution is that the outer wall of the push rod is provided with an axial groove, and the limiting push screw extends into the groove, thereby limiting the relative rotation of the sliding sleeve and the push rod.

[0009] Compared with the prior art, the present invention has the following advantages: the two U-shaped clamps of the present invention can not only be hung on the crank, but the height of the U-shaped clamps relative to the crank can also be adjusted by the extension length of the upper and lower jacking bolts, thereby ensuring that the push rod can accurately press against the crank pin. The upper and lower jacking bolts are used to clamp the U-shaped clamps to the crank if the pumping unit is shut down and the crank is not in a horizontal position, so as to ensure that the U-shaped clamps do not slide. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a top view of the present utility model.

[0011] Figure 2 yes Figure 1 Center AA direction view.

[0012] In the figure: 1. Pull rod; 2. Connecting rod; 3. Crank; 4. U-shaped clamp; 5. Sliding sleeve; 6. Spring; 7. Jack; 8. Tightening bolt; 9. Limiting screw; 10. Push rod. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0014] like Figure 1 and Figure 2As shown, the utility model includes a pull rod 1, a jack 7 and a connecting rod 2; the pull rod 1 is installed at the rear end of the two cranks 3 to prevent the two cranks 3 from separating from each other. The jack 7 is located between the pins of the two cranks 3, and the front and rear ends of the jack 7 are respectively fixed with a push rod 10, which presses on the pins of the cranks 3. A sliding sleeve 5 is provided on the outer side of the push rod 10, and a U-shaped clamp 4 is fixed on the sliding sleeve 5 near the side of the crank 3 pin. The bayonet of the U-shaped clamp 4 is clamped on the crank 3. A tightening bolt 8 is provided on the upper and lower sides of the U-shaped clamp 4 respectively. After tightening, the tightening bolt 8 presses on the upper and lower sides of the crank 3 respectively. The height of the U-shaped clamp 4 relative to the crank 3 is adjusted by adjusting the ejection length of the two tightening bolts 8, and then the position of the jack 7 and the crank 3 pin is adjusted to ensure alignment. In this embodiment, since the U-shaped clamp 4 is hung on the crank 3, there is no need for personnel to lift the jack 7, so this application is more labor-saving.

[0015] The jack 7 described in this embodiment can be a manual jack 7 or a hydraulic jack 7.

[0016] A spring 6 is provided between the sliding sleeve 5 and the jack 7 . Under the elastic force of the spring 6 , the sliding sleeve 5 tends to move closer to the crank 3 , thereby ensuring that the U-shaped clamp 4 does not fall off the crank 3 .

[0017] When the present application is not in use, in order to prevent the sliding sleeve 5 from slipping, a limit screw 9 is screwed on the radial direction of the sliding sleeve 5, and the limit screw 9 is pressed against the push rod 10, thereby limiting the sliding of the sliding sleeve 5 relative to the push rod 10.

[0018] The outer wall of the push rod 10 is provided with an axial groove, and the limiting push screw 9 extends into the groove, thereby limiting the relative rotation of the sliding sleeve 5 and the push rod 10.

[0019] In summary, this embodiment not only liberates manpower to lift, but also can adjust the position of jack 7 and crank 3 pin to ensure alignment. At the same time, whether crank 3 is in a horizontal state when the pumping unit is stopped does not affect the normal installation of this application.

Claims

1. A device for adjusting the position of a crank (3) pin of an oil pumping unit, comprising a pull rod (1) and a jack (7); the pull rod (1) is mounted at the rear ends of the two cranks (3) to prevent the two cranks (3) from separating from each other; the jack (7) is located between the pins of the two cranks (3), and a push rod (10) is fixed to the front and rear ends of the jack (7), respectively, and the push rod (10) is pressed against the pins of the crank (3), and is characterized in that: A sliding sleeve (5) is provided on the outer side of the push rod (10), and a U-shaped clamp (4) is fixedly connected to the sliding sleeve (5) on the side close to the pin of the crank (3). The bayonet of the U-shaped clamp (4) is clamped on the crank (3). A tightening bolt (8) is provided on the upper side and the lower side of the U-shaped clamp (4). After the tightening bolt (8) is tightened, it presses against the upper side and the lower side of the crank (3). The height of the U-shaped clamp (4) relative to the crank (3) is adjusted by adjusting the ejection length of the two tightening bolts (8); A spring (6) is provided between the sliding sleeve (5) and the jack (7). Under the elastic force of the spring (6), the sliding sleeve (5) has a movement tendency to approach the crank (3), thereby ensuring that the U-shaped clamp (4) does not fall off the crank (3).

2. A pumping unit crank (3) pin position adjustment device according to claim 1, characterized in that: The sliding sleeve (5) is radially screwed with a limiting top screw (9), and the limiting top screw (9) abuts against the top rod (10), thereby limiting the sliding of the sliding sleeve (5) relative to the top rod (10).

3. A pumping unit crank (3) pin position adjustment device according to claim 2, characterized in that: The outer wall of the push rod (10) is provided with an axial groove, and the limiting push screw (9) extends into the groove, thereby limiting the relative rotation of the sliding sleeve (5) and the push rod (10).

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