Crank pin dismounting device for universal beam-pumping unit

Abstract

The utility model discloses a general type beam-pumping unit crank pin dismounting device which is provided with an impact hammer, an impact rod is mainly composed of a middle connecting rod and an impact connecting rod and is adjustable in length, and the two ends of the middle connecting rod are connected with the impact connecting rod externally provided with impact rings. The outer ends of the two impact connecting rods are provided with impact heads with the outer diameter smaller than that of the crank pin hole, chucks are installed outside the impact heads, and impact hammers are installed outside the impact connecting rods on the inner side of the impact ring and can slide towards the two sides outside the impact connecting rods. A clamping distance adjusting disc and a telescopic claw are arranged in the chuck, and the telescopic claw provided with a centralizing block can be connected with the clamping distance adjusting disc and can contract inwards and expand outwards in the chuck along with rotation of the clamping distance adjusting disc. The impact rod is adjustable and can adapt to different machine types, the purpose that one set of dismounting device is suitable for all beam-pumping unit machine types is achieved, the using effect is remarkable, and the good application and popularization value is achieved.

Description

Technical Field

[0001] The utility model relates to a disassembly tool for a crank pin of a beam pumping unit, in particular to a universal disassembly device for a crank pin of a beam pumping unit. Background Art

[0002] On a beam pumping unit, the crank pin device is one of the main transmission components of power. It consists of a crank pin, bearing, bearing seat, bearing end cover, etc. It is a vulnerable part of the pumping unit and needs to be replaced frequently. The main reason is that during the oil production process, the equipment load of the pumping unit increases, and the equipment ages, which makes the pumping unit have periodic vibration, shaking and other problems, causing the crank pin of the pumping unit to be frequently damaged; in addition, in order to increase the production of oil wells, adjusting the stroke of the pumping unit is a common ground parameter adjustment method. The stroke adjustment of the beam pumping unit is achieved by changing the crank pin hole at different positions of the crank pin, so adjusting the stroke of the pumping unit is a process of disassembling and assembling the crank pin. At present, the most common way to disassemble the crank pin of the pumping unit is to remove the crank pin from the crank pin holes on both sides of the crank of the pumping unit every time the crank pin is replaced or the stroke of the pumping unit is adjusted. Crank pin removal has become a regular work performed on the oil production and maintenance site.

[0003] Due to the long-term heavy-load operation of the oil pump in the field, it is exposed to wind and rain, and rust, which increases the difficulty of removing the crank pin. At present, without the use of special tools, the operation of removing the crank pin is time-consuming and labor-intensive, and requires 4-5 people to work together to complete it; the replacement time is long, and the operators have always used the method of standing on the oil pump reducer and swinging a sledgehammer to "smash" it. The operating space is very narrow and it is a high-altitude operation. There is a risk of injury and falling, and the safety of on-site workers cannot be effectively guaranteed. An investigation and tracking of the operation link of replacing the crank pin revealed the following risks and defects:

[0004] (1) The risk factor of on-site operation is high. The operator needs to stand inside the crank guardrail to perform the hammering operation. It requires a large number of workers and high labor intensity, at least 4-5 people;

[0005] (2) Disassembly takes as long as 1-2 hours, which has low work efficiency and affects the oil well production;

[0006] (3) The construction of on-site personnel and the coordination of multiple commonly used construction tools are carried out simultaneously, which is very likely to cause personal injury during cross-operation;

[0007] (4) Manual hammering can easily damage the threads of the crown nut and crank pin.

[0008] In order to solve the above problems, the on-site staff has done a lot of work and achieved certain results. After searching, there are currently the following related technologies:

[0009] 1. Patent application number CN201220714172.1 discloses a mechanical walking beam pumping unit crank pin assembly maintenance tool. The utility model relates to the field of oil production technology and includes: a flange, a rib plate, a center sleeve, a center rod, a nut, a hand wheel, and a pad. The flange of the mechanical walking beam pumping unit crank pin assembly maintenance tool is provided with four arc-shaped bolt holes, and four rib plates connect the flange with the center sleeve. The center sleeve is provided with an internal trapezoidal thread, and the center rod with an external trapezoidal thread is threadedly connected to the center sleeve. The left end of the center sleeve is provided with a step and an external thread, which is connected to the hand wheel through a key, and the nut is connected to the external thread of the center sleeve to tighten the hand wheel.

[0010] The beneficial effects of the utility model are: simple structure, safe operation, time and labor saving, short downtime for repairing the crank pin assembly of the walking beam pump, improved oil production rate, avoiding sand stuck in the well caused by serious sand production in the oil well, increasing crude oil production, and improving the economic benefits of the oil field.

[0011] The above mechanical beam pumping unit crank pin assembly maintenance tool adopts a screw ejection method, which has no impact force and is difficult to remove the crank pin. The disassembly device is bulky and the on-site installation and use are time-consuming and labor-intensive.

[0012] 2. Patent application number CN202022595664.0 discloses a universal disassembly and assembly tool for crank pin of a pumping unit. The utility model includes a crank hanger, a multi-purpose swing shaft is connected to the crank hanger, a swing shaft hanging ear is fixed at one end of the multi-purpose swing shaft, a telescopic rod is connected to the bottom of the swing shaft hanging ear, a pendulum rod is connected to the telescopic rod, and a hammer is connected to the end of the pendulum rod. A sleeve is provided above the swing shaft hanging ear at one end of the multi-purpose swing shaft, and a crowbar head is provided at the other end, and a plurality of positioning grooves are provided in the middle of the multi-purpose swing shaft. It also includes a positive buckle decomposition hammer head and a reverse buckle decomposition hammer head, one end of the positive buckle decomposition hammer head is provided with a positive buckle external thread, the inner hole is provided with a positive buckle decomposition hammer head internal thread, the reverse buckle decomposition hammer head is provided with an inner hole, and one end of the reverse buckle decomposition hammer head is provided with a reverse buckle thread. The positive buckle decomposition hammer head and the reverse buckle decomposition hammer head are connected to the two ends of the hammer head through positive and reverse middle threads respectively, and a bushing impact ring is provided between the positive buckle decomposition hammer head and the hammer head. The positive buckle decomposition hammer head is connected to the end of the telescopic rod through the positive buckle decomposition hammer head internal thread, and the reverse buckle decomposition hammer head is sleeved on the telescopic rod.

[0013] The above-mentioned utility model has the following beneficial effects: after assembly, the tool can be hung on the crank and the direction can be adjusted to achieve the function of a pendulum; after disassembly, it can form a slide hammer, a crowbar, a socket wrench, can protect the crank pin, and be used as a bushing punch and other functions. Therefore, carrying a set of tools can complete all the processes of disassembling and assembling the crank pin, smashing, punching, prying, pulling, and disassembling. It is easy to carry and labor-saving to operate.

[0014] However, the above utility model is suspended on the walking beam of the oil pump, which has operational risks during installation and requires swinging and knocking during use, which is inaccurate.

[0015] 3. Patent application number CN201220476987.0 discloses a special tool for disassembling and assembling a crank pin of an oil pumping unit. The technical solution adopted by the utility model includes a sleeve head, a pull rod, a first sector plate, a force rod sleeve, an inner hexagonal sleeve, a second sector plate, a baffle, a nut, a screw, a pin shaft, a connecting rod, a counterweight, a gasket, a fixing screw and a lifting ring. The feature is that the sleeve head has a regular hexagonal prism, the regular hexagonal prism has a central hole, a sleeve is connected to one end of the regular hexagonal prism, the sleeve is composed of four sectors evenly distributed at the ends of the regular hexagonal prism, and the sleeve of the sleeve head 1 can be sleeved on the end of the crank pin of the oil pumping unit. The first sector plate, the inner hexagonal sleeve and the second sector plate are sleeved on the regular hexagonal prism of the sleeve head in sequence; the first sector plate and the second sector plate have the same structure as a flat plate, the flat plate has a circular plate and a sector plate, there is a regular hexagonal hole in the middle of the circular plate, six screw holes are evenly distributed around the regular hexagonal hole, there are three circular holes on the sector plate, and a pin is passed through and fixed in any of the circular holes; the inner hexagonal sleeve is a cylindrical body, and the inner hexagonal sleeve has a regular hexagonal center hole; there is a baffle on the outside of the second sector plate, the baffle is circular The flat plate has a center hole, and six round holes are evenly distributed around the center hole corresponding to the six screw holes of the first sector plate; screws pass through the screw holes of the baffle plate to fix the baffle plate on the second sector plate; a pull rod is arranged in the center hole of the sleeve head, and the pull rod is composed of a cylindrical rod and a disc, one end of the cylindrical rod is vertically fixed to the center position of the disc, and there are three holes on the disc for fixing the crank pin of the pumping unit, and there is a thread on the other end of the cylindrical rod, and the cylindrical rod of the pull rod passes through the center hole of the sleeve head and the center hole of the baffle plate, and a nut is fixed on the other end of the cylindrical rod; A force rod sleeve is sleeved on the outer wall of the inner hexagonal sleeve, and the force rod sleeve structure is composed of a cylinder and a connecting rod, the connecting rod is connected to the outer wall of the cylinder, and the cylinder is sleeved on the outer wall of the inner hexagonal sleeve; the outer wall of the connecting rod is threaded; the connecting rod of the force rod sleeve is threadedly connected to a connecting rod, and the connecting rod is a round tube; a counterweight block is fixed to the other end of the connecting rod, and the center hole of the counterweight block is sleeved on the outer wall of the end of the connecting rod, and a circular gasket is provided on the end surface of the connecting rod, and a fixing screw passes through the center hole of the gasket to fix the counterweight block and the gasket to the end of the connecting rod; a lifting ring is fixed to the side wall of the counterweight block.

[0016] The above utility model has a complex structure, a heavy device, is inconvenient to install and use, and lacks versatility and multi-purpose.

[0017] In summary, the above patented technology uses mechanical or hydraulic force, the disassembly device is relatively bulky, and there are still defects in on-site installation and use. Since there are many types of oil pumping units on site, the nuts installed in the crank pins are of different sizes, and the distances between the connecting rods are different, it can only meet the needs of one type of machine, but not all models. Summary of the invention

[0018] In order to overcome the above shortcomings of the prior art and realize the smooth disassembly of the crank pin of a beam pumping unit, a universal crank pin disassembly device for a beam pumping unit is provided, which makes the device easy to use and reduces the labor intensity of construction personnel. At the same time, it can reduce the number of workers, improve the disassembly efficiency of the crank pin, ensure the personal safety of construction personnel, meet the needs of all machine models, reduce the downtime of oil wells, and improve the oil production timeliness.

[0019] The technical solution of the utility model is: a universal walking beam type oil pump crank pin disassembly device, provided with a striking hammer, wherein: the striking rod is mainly composed of an intermediate connecting rod and an striking connecting rod and the length is adjustable, and the two ends of the intermediate connecting rod are connected to the striking connecting rod with an striking ring on the outside; the outer ends of the two striking connecting rods are provided with striking heads with an outer diameter smaller than the crank pin hole and a chuck is installed on the outside of the striking heads, and the striking hammer is installed on the outside of the striking connecting rod on the inner side of the striking ring and can slide to both sides outside the striking connecting rod;

[0020] The chuck is provided with a distance adjustment disk and a telescopic claw. The telescopic claw provided with a straightening block can be connected with the distance adjustment disk and can shrink inwards and expand outwards in the chuck as the distance adjustment disk rotates.

[0021] Preferably, the distance adjustment disk is an I-shaped disk body with a large outer diameter at one end and a small outer diameter at the other end. A connecting thread is provided on the outer end face of the large diameter disk body of the distance adjustment disk. The large diameter disk body provided with the connecting thread is installed in the chuck and the connecting thread can be threadedly connected to the telescopic claw installed in the outer end face of the chuck.

[0022] Preferably, the telescopic claw is a strip-shaped body with slots on both sides, one side of the strip is provided with a connecting thread and the other side is fixed with a straightening block, and the slots on both sides of the telescopic claw match with the track slots in the chuck.

[0023] Preferably, a positioning hole is provided in the disk surface inside the large-diameter disk body of the distance adjustment disk, and a positioning block with a pin hole is fixed outside the cylinder between the large-diameter disk body and the small-diameter disk body, and a positioning pin is inserted into the pin hole; the positioning hole is a screw hole that passes through the distance adjustment disk and can correspond to the countersunk hole provided in the lower end surface of the inner side of the chuck; the positioning pin is provided with an external thread and can pass through the distance adjustment disk and be screwed into the countersunk hole of the chuck to fix the chuck and the distance adjustment disk together; an adjustment handle is welded on the inner side surface of the large-diameter disk body of the distance adjustment disk.

[0024] Preferably, there are more than three telescopic claws installed in the chuck; and the positioning holes are evenly arranged along the inner disk surface of the large-diameter disk body of the chuck distance adjustment disk.

[0025] Preferably, one end of the impact head is conical and has a maximum outer diameter smaller than the inner diameter of the crank pin hole in the beam pumping unit, and the other end is provided with a connecting rod mounting hole, into which the impact connecting rod can be inserted.

[0026] Preferably, the outer diameter of the rod body of the intermediate connecting rod is smaller than the outer diameter of the impact connecting rod and an intermediate connecting rod adjustment square is provided in the middle, and the outer surface of the rod body of the intermediate connecting rod on both sides of the intermediate connecting rod adjustment square is provided with external threads, which can be connected to the internal threads of the center hole of the impact connecting rod.

[0027] Preferably, a straightening gasket is also installed on the outside of the rod body of the intermediate connecting rod. The straightening gasket is two semicircular plate-shaped bodies and straightening gasket snap-ons are provided at both ends of the two semicircular plate-shaped bodies. After the two straightening gaskets are aligned, the straightening gasket snap-ons are embedded and installed in the straightening plate locking nuts connected at both ends of the intermediate connecting rod.

[0028] Preferably, an impact connecting rod adjustment square is provided at the inner end of one of the impact connecting rods, and an intermediate connecting rod locking nut is installed at the inner front end of the other impact connecting rod; the outer diameter of the straightening gasket after matching is equal to the outer diameter of the impact connecting rods at both ends and the outer diameter of the intermediate connecting rod locking nut.

[0029] Preferably, the impact hammer is a cylinder with a center hole and an impact hammer mounting groove is provided along the axial direction of the cylinder and is connected with the center hole. The width of the impact hammer mounting groove is equal to or greater than the outer diameter of the impact connecting rod; and an impact hammer handle and an impact pull ring are provided on the outer circle of the cylinder of the impact hammer.

[0030] Compared with the prior art, the remarkable use effect of the utility model is that the device uses the method of mechanical impact, adopts the principle of prestress and dynamic impact inertia, and utilizes the symmetrical structure of the crank pin of the oil pumping unit. The disassembly of the crank pins on both sides of the oil pumping unit can be completed with one assembly. The chuck in the utility model is provided with a telescopic claw and a distance adjustment disk. The distance adjustment disk is provided with a positioning hole and a positioning pin. Through the threaded connection or engagement of the telescopic claw and the distance adjustment disk in the chuck, crank pins of different diameters can be fixed without removing the nut of the crank pin. The impact rod is adjustable and adaptable to different models, so as to achieve the purpose of a set of disassembly devices being applicable to all types of walking beam oil pumping units. Its use effect is specifically manifested in:

[0031] 1. The utility model can complete the functions of disassembling the crank pins on both sides of the oil pumping unit, adjusting the impact rod, and adjusting the distance of the telescopic claws in the chuck by one assembly, which greatly facilitates on-site operation and use.

[0032] 2. The working efficiency of crank pin disassembly and replacement is greatly improved. There is no need for high-altitude operations. It is easy to install and use, has a high safety factor, avoids the dangers of being smashed, bumped, squeezed and falling from heights, and the safety factor of the operator is guaranteed.

[0033] 3. The utility model has a reasonable structure, is light and compact, and has been proven through field experiments to be able to effectively reduce the labor intensity of operators and reduce the downtime of operators and oil wells. The number of on-site construction personnel has been reduced from 4-5 to 2; the average disassembly time of the crank pins of various beam pumping units has been effectively reduced, and the labor cost after use is 1 / 6 of the original.

[0034] In summary, the utility model has significant use effect and can achieve good economic benefits, and has good promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is the front view of the schematic diagram of the structure of the utility model. In order to clearly express the internal structure, the small-diameter disc body of the distance adjustment disc in the figure is not drawn.

[0037] Figure 2 It is a schematic diagram of the connection between the impact head and the impact connecting rod.

[0038] Figure 3 for Figure 1 Schematic diagram of the structure of the chuck and the distance adjustment disk.

[0039] Figure 4 for Figure 1 Schematic diagram of the expanded structure of the impact rod.

[0040] In the figure: adjusting handle 1, chuck 2, telescopic claw 3, positioning hole 4, positioning pin 5, distance adjustment disk 6, impact head center hole 19, impact ring 7, impact connecting rod 8, impact connecting rod adjustment square 9, righting gasket 10, righting plate locking nut 11, intermediate connecting rod 12, impact hammer handle 13, impact pull ring 14, impact hammer 15, impact hammer mounting groove 16, righting block 17, impact head 18, connecting rod mounting hole 19, intermediate connecting rod adjustment square 20, righting gasket bayonet 21, intermediate connecting rod locking nut 22. DETAILED DESCRIPTION

[0041] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of the present utility model. The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0042] In order to make the purpose, technical solution 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. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0043] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] See also Figures 1 to 4 , a universal walking beam type oil pump crank pin disassembly device, provided with a striking hammer 15, wherein: the striking rod is mainly composed of an intermediate connecting rod 12 and an striking connecting rod 8 and has an adjustable length, and the two ends of the intermediate connecting rod 12 are connected to the striking connecting rod 8 with an striking ring 7 on the outside; the outer ends of the two striking connecting rods 8 are provided with striking heads 18 with an outer diameter smaller than the crank pin hole, and a chuck 2 is installed on the outside of the striking head 18, and the striking hammer 15 is installed on the outside of the striking connecting rod 8 on the inner side of the striking ring 7 and can slide to both sides outside the striking connecting rod 8; the chuck 2 is provided with a card distance adjustment disk 6 and a telescopic claw 3, and the telescopic claw 3 with a straightening block 17 on it can be connected with the card distance adjustment disk 6 and can shrink inward and expand outward in the chuck 2 as the card distance adjustment disk 6 rotates.

[0045] The utility model installs the impact hammer 15 outside the impact connecting rod 8 inside the impact ring 7 and can slide to both sides outside the impact connecting rod 8 to impact the impact rings 7 on both sides, and impact the impact heads 18 installed on both sides of the impact connecting rod 8 through the impact ring 7.

[0046] Since the outer diameter of the impact head 18 is smaller than the crank pin hole in the beam pumping unit, each impact of the impact hammer 15 on both sides outside the impact rod can impact the crank pins installed on both sides of the pumping unit crank through the impact head 18, saving time and effort.

[0047] The utility model has a chuck 2 installed outside the impact head 18, and the telescopic claw 3 installed in the chuck 2 is connected to the distance adjustment disk 6 and can shrink inward and expand outward with the rotation of the distance adjustment disk 6, and can well clamp the straightening block 17 outside the nut of the crank; at the same time, the impact rod in the utility model is mainly composed of the middle connecting rod 12 and the impact connecting rod 8, which is an adjustable rod body, which can be supported between the connecting rods of different types of oil pumping units, and is easy to adjust. In this way, the tool can be used for disassembling the crank pins of all types of walking beam oil pumping units, and is a universal tool for disassembling the crank pins of oil pumping units.

[0048] The tool has a reasonable structure, is light in weight, and is easy to use, thus overcoming the defects of the prior art and having a significant use effect.

[0049] Based on the above embodiment 1, the utility model also has the following embodiments:

[0050] A preferred embodiment: the distance adjustment disk 6 is an I-shaped disk body with a large outer diameter at one end and a small outer diameter at the other end, and a connecting thread is provided on the outer end face of the large diameter disk body of the distance adjustment disk 6. The large diameter disk body with the connecting thread is installed in the chuck 2 and the connecting thread can be threadedly connected with the telescopic claw 3 installed in the outer end face of the chuck 2.

[0051] A preferred embodiment: the telescopic claw 3 is a strip body with slots on both sides, one side of the strip body is provided with connecting threads, and the other side is fixed with the straightening block 17, and the slots on both sides of the telescopic claw 3 match the track slots in the chuck 2. The telescopic claw 3 is installed in the track slot of the chuck 2 through the slots on both sides, and because the connecting threads in the outer end surface of the distance adjustment disk 6 are threadedly connected with the telescopic claw 3 installed in the track slot of the chuck 2, when the distance adjustment disk 6 is rotated forward or reverse, the telescopic claw 3 can drive the straightening block 17 to move inward or outward in the track slot of the chuck 2, so that the straightening block 17 is clamped on the outside of the nut of the crank pin.

[0052] A preferred embodiment: a positioning hole 4 is provided in the disk surface inside the large diameter disk body of the distance adjustment disk 6, and a positioning block with a pin hole is fixed outside the cylinder between the large diameter disk body and the small diameter disk body, and a positioning pin 5 is installed in the pin hole; the positioning hole 4 is a screw hole that passes through the distance adjustment disk 6 and can correspond to the countersunk hole provided in the inner lower end surface of the chuck 2; the positioning pin 5 is provided with an external thread and can pass through the distance adjustment disk 6 and be screwed into the countersunk hole of the chuck 2 to fix the chuck 2 and the distance adjustment disk 6 together; an adjustment handle 1 is welded on the inner side surface of the large diameter disk body of the distance adjustment disk 6. The positioning hole 4 and the positioning pin 5 can prevent the distance adjustment disk 6 from moving during the process of removing the crank pin, and the installation of the adjustment handle 1 can easily rotate the distance adjustment disk 6, making the operation more convenient.

[0053] A preferred embodiment: more than three telescopic claws 3 are installed in the chuck 2; and the positioning holes 4 are evenly arranged along the inner disk surface of the large-diameter disk body of the chuck distance adjustment disk 6.

[0054] A preferred embodiment: one end of the impact head 18 is conical and has a maximum outer diameter smaller than the inner diameter of the crank pin hole in the beam pumping unit, and the other end is provided with a connecting rod mounting hole 19, into which the impact connecting rod 8 can be inserted.

[0055] A preferred embodiment: the outer diameter of the rod body of the intermediate connecting rod 12 is smaller than the outer diameter of the impact connecting rod 8 and an intermediate connecting rod adjustment square 20 is provided in the middle, and the outer surface of the rod body of the intermediate connecting rod 12 on both sides of the intermediate connecting rod adjustment square 20 are provided with external threads, which can be connected to the internal threads of the center hole of the impact connecting rod 8.

[0056] A preferred embodiment: a straightening gasket 10 is also installed on the outside of the rod body of the intermediate connecting rod 12. The straightening gasket 10 is two semicircular plate-shaped bodies and straightening gasket snap-in sockets 21 are provided at both ends of the two semicircular plate-shaped bodies. After the two straightening gaskets 10 are aligned, the straightening gasket snap-in sockets 21 are embedded and installed in the straightening plate locking nuts 11 connected at both ends of the intermediate connecting rod 12.

[0057] A preferred embodiment: the inner end of one of the impact connecting rods 8 is provided with an impact connecting rod adjustment square 9, and the inner front end of the other impact connecting rod 8 is provided with an intermediate connecting rod locking nut 22; the outer diameter of the straightening gasket 10 after being matched is equal to the outer diameter of the impact connecting rods 8 at both ends and the outer diameter of the intermediate connecting rod locking nut 22. The impact hammer 15 can slide freely between the impact connecting rods 8 connected by the intermediate connecting rod 12. The impact connecting rod adjustment square 9 is convenient for adjusting the impact connecting rod 8 and convenient for installation with the impact head 18; the intermediate connecting rod locking nut 22 can realize the connection and fixation between the intermediate connecting rod 12 and the impact connecting rod 8.

[0058] A preferred embodiment: the impact hammer 15 is a cylinder with a center hole and an impact hammer installation groove 16 is provided along the axial direction of the cylinder and is connected to the center hole. The width of the impact hammer installation groove 16 is equal to or greater than the outer diameter of the impact connecting rod 8; an impact hammer handle 13 and an impact pull ring 14 are provided on the outer circle of the cylinder of the impact hammer 15. The impact hammer 15 in the utility model has a simple structure. The impact hammer 15 can be held by the impact hammer handle 13 and slid forcefully, or the impact pull ring 14 can be connected to the pull rope to apply force to the impact hammer 15, so that it can slide smoothly left and right along the impact rod formed by the impact connecting rod 8 and the middle connecting rod 12. The impact hammer handle 13 and the impact pull ring 14 provided in the impact hammer 15 can conveniently apply force to the impact hammer 15 and generate impact kinetic energy to impact the pre-disassembled crank pin, which is more convenient for its use and operation.

[0059] Installation and use method of this utility model:

[0060] 1. Stop the oil pump according to the standardized operation requirements for replacing the crank pin of the oil pump: apply the brakes, cut off the power supply, close the door of the electric control cabinet, and hang a warning sign on the brake handle.

[0061] 2. Install the wellhead unloading clip.

[0062] 3. Start the pumping unit according to the standard operation requirements of the pumping unit: remove the load of the suspension rope, apply the brake, cut off the power supply, close the electric control cabinet door, and hang a warning sign on the brake handle.

[0063] 4. In accordance with the standardized operating procedures for replacing the crank pin, provide safety protection on both sides of the pump at the head and tail bearings of the pump.

[0064] 5. Loosen the crank pin nuts on both sides of the oil pump.

[0065] 6. Rotate and loosen the adjustment handle 1 to drive the telescopic claw 3 to move axially, so that the clamping diameter of the telescopic claw 3 becomes larger. After inserting the crank pin, rotate the adjustment handle 1 in the opposite direction to drive the telescopic claw 3 to move axially and reduce its clamping diameter, so that the straightening block 17 is clamped on the outside of the crank pin nut;

[0066] 7. Insert the positioning pin 5 into the positioning hole 4 to position the chuck 2 and prevent it from loosening;

[0067] 8. Install the two impact connecting rods 8 in the center holes 19 of the impact heads 18 on both sides respectively, and the middle connecting rod 12 is threadedly connected to the center holes of the impact connecting rods 8 on both sides;

[0068] 9. Rotate the locking nut 22 of the middle connecting rod to tighten the middle connecting rod 12 outward, apply pre-tightening force to the crank pins on both sides, and support the two impact heads 18 on the crank pins on both sides of the crank of the pumping unit.

[0069] 10. Install the impact hammer 15: insert the impact hammer installation groove 16 in the impact hammer 15 outside the middle connecting rod 12, and move it to the outside of the impact connecting rod 8 on one side after insertion.

[0070] 11. Install the straightening gasket 10 outside the middle connecting rod 12, tighten the straightening plate locking nut 11, so that its outer diameter is the same as the outer diameter of the impact connecting rod 8, and the impact hammer 15 can move freely outside the impact rod.

[0071] 12. Apply force to the impact hammer 15 to generate impact kinetic energy, and impact the pre-disassembled crank pin.

[0072] 13. After the crank pin is loosened, loosen the positioning pins 5 in the chucks 2 on both sides respectively, rotate the adjustment handle 1, drive the telescopic claws 3 to move axially to increase the clamping diameter, and remove the devices respectively.

[0073] 14. After the crank pin is replaced, resume production according to the standardized operating procedures.

[0074] The embodiments described above are only typical embodiments, but the utility model is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and enlightenment of the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modifications, equivalent replacements, improvements, etc. made within the creative spirit and creative concept of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope is not limited to the above description.

Claims

1. A universal beam pumping unit crank pin removal device, provided with a striking hammer, is characterized by: The impact rod is mainly composed of an intermediate connecting rod and an impact connecting rod with adjustable length. The two ends of the intermediate connecting rod are connected to the impact connecting rod with an impact ring on the outside; the outer ends of the two impact connecting rods are equipped with impact heads with an outer diameter smaller than the crank pin hole and a chuck is installed on the outside of the impact head, and the impact hammer is installed on the outside of the impact connecting rod on the inner side of the impact ring and can slide to both sides outside the impact connecting rod; the chuck is equipped with a distance adjustment disk and a telescopic claw, and the telescopic claw with a straightening block on it can be connected to the distance adjustment disk and can shrink inward and expand outward in the chuck as the distance adjustment disk rotates.

2. The universal beam pumping unit crank pin removal device according to claim 1, characterized in that: The distance adjustment disk is an I-shaped disk body with a large outer diameter at one end and a small outer diameter at the other end. A connecting thread is provided on the outer end face of the large diameter disk body of the distance adjustment disk. The large diameter disk body with the connecting thread is installed in the chuck and the connecting thread can be threadedly connected to the telescopic claw installed in the outer end face of the chuck.

3. The universal beam pumping unit crank pin removal device according to claim 1 or 2, characterized in that: The telescopic claw is a strip body with slots on both sides, one side of the strip body is provided with a connecting thread, and the other side is fixed with a straightening block, and the slots on both sides of the telescopic claw match with the track slots in the chuck.

4. The universal beam pumping unit crank pin removal device as claimed in claim 3, characterized in that: A positioning hole is provided in the disk surface inside the large-diameter disk body of the distance adjustment disk, and a positioning block with a pin hole is fixed outside the cylinder between the large-diameter disk body and the small-diameter disk body, and a positioning pin is installed in the pin hole; the positioning hole is a screw hole that passes through the distance adjustment disk and can correspond to the countersunk hole provided in the lower end surface of the inner side of the chuck; the positioning pin is provided with an external thread and can pass through the distance adjustment disk and be screwed into the countersunk hole of the chuck to fix the chuck and the distance adjustment disk together; an adjustment handle is welded on the inner side of the large-diameter disk body of the distance adjustment disk.

5. The universal beam pumping unit crank pin removal device as claimed in claim 4, characterized in that: There are more than three telescopic claws installed in the chuck; and the positioning holes are evenly arranged along the inner disk surface of the large-diameter disk body of the chuck distance adjustment disk.

6. The universal beam pumping unit crank pin removal device as claimed in claim 1, characterized in that: One end of the impact head is conical and has a maximum outer diameter smaller than the inner diameter of the crank pin hole in the beam pumping unit, and the other end is provided with a connecting rod mounting hole, into which the impact connecting rod can be inserted.

7. The universal beam pumping unit crank pin removal device as claimed in claim 6, characterized in that: The outer diameter of the rod body of the intermediate connecting rod is smaller than the outer diameter of the impact connecting rod and an intermediate connecting rod adjustment square is provided in the middle. The outer surfaces of the rod bodies of the intermediate connecting rods on both sides of the intermediate connecting rod adjustment square are provided with external threads, which can be connected to the internal threads of the center hole of the impact connecting rod.

8. The universal beam pumping unit crank pin removal device as claimed in claim 7, characterized in that: A straightening gasket is also installed outside the rod body of the middle connecting rod. The straightening gasket is two semicircular plate-shaped bodies and straightening gasket snap-ons are provided at both ends of the two semicircular plate-shaped bodies. After the two straightening gaskets are aligned, the straightening gasket snap-ons are embedded and installed in the straightening plate locking nuts connected at both ends of the middle connecting rod.

9. The universal beam pumping unit crank pin removal device as claimed in claim 8, characterized in that: An impact connecting rod adjustment square is provided at the inner end of one of the impact connecting rods, and an intermediate connecting rod locking nut is installed at the inner front end of the other impact connecting rod; the outer diameter of the straightening gasket after matching is equal to the outer diameter of the impact connecting rods at both ends and the outer diameter of the intermediate connecting rod locking nut.

10. The universal beam pumping unit crank pin removal device according to claim 1, characterized in that: The impact hammer is a cylinder with a center hole and an impact hammer installation groove is provided along the axial direction of the cylinder and is connected with the center hole. The width of the impact hammer installation groove is equal to or greater than the outer diameter of the impact connecting rod; an impact hammer handle and an impact pull ring are provided on the outer circle of the cylinder of the impact hammer.

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