Drilling pump connecting rod crosshead assembly with independent disassembly and assembly function

Abstract

The invention discloses a drill pump connecting rod crosshead assembly with an independent disassembly and assembly function, which comprises a crankshaft which penetrates through a rack and is perpendicular to the rack, a split rolling bearing is sleeved outside a crank throw of the crankshaft, a large end of a connecting rod is sleeved outside the split rolling bearing, and a crosshead is sleeved at a small end of the connecting rod. A small-head bearing is arranged in one end, close to the crosshead, of the connecting rod, the crosshead is fixedly connected with the small-head bearing through a positioning screw, two groups of guide plates matched with the crosshead are arranged on the rack, and the crosshead slides back and forth between the two groups of guide plates. According to the drill pump connecting rod crosshead assembly with the independent dismounting and mounting function, the problem that a five-cylinder drill pump connecting rod crosshead in the prior art is difficult to dismount and mount is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas drilling equipment, and relates to a drilling pump connecting rod crosshead assembly with independent disassembly function. BACKGROUND

[0002] The connecting rod crosshead is a core component of the drilling pump, and is used for converting the rotary motion of the crankshaft into the reciprocating motion of the piston. The crankshaft of the three-cylinder drilling pump generally adopts two-point support, which facilitates the connecting rod to be sleeved from one end of the crankshaft, assembled into a whole with the crankshaft, and then assembled into the pump body. The process of assembling the connecting rod to the crankshaft needs to be performed outside the pump body. With the development of the drilling pump from three cylinders to five cylinders, the width of the pump body and the disassembly difficulty also increase, and the two-point support structure of the crankshaft cannot meet the strength requirement of the five-cylinder pump. At present, the crankshaft of the five-cylinder pump generally adopts a six-point support structure, and the structure of the connecting rod of the traditional three-cylinder pump is not applicable to the five-cylinder pump. Therefore, a connecting rod crosshead structure with independent disassembly function needs to be designed, so that the connecting rod crosshead of each cylinder can be disassembled individually without disassembling the crankshaft, thereby reducing the disassembly frequency of the crankshaft and improving the use and maintenance performance of the five-cylinder pump. SUMMARY

[0003] The present application aims to provide a drilling pump connecting rod crosshead assembly with independent disassembly function, and solves the problem of difficult disassembly of the connecting rod crosshead of the five-cylinder drilling pump in the prior art.

[0004] The technical scheme adopted by the present application is that the drilling pump connecting rod crosshead assembly with independent disassembly function comprises a rack, a crankshaft vertically arranged on the rack, a split type rolling bearing arranged on the crankpin of the crankshaft, one end of a connecting rod arranged on the split type rolling bearing, a crosshead arranged on the other end of the connecting rod, a small end bearing arranged in the end of the connecting rod close to the crosshead, and a positioning screw fixedly connecting the crosshead and the small end bearing.

[0005] Two guide plates matched with the crosshead are arranged on the rack, and the crosshead is arranged between the two guide plates.

[0006] The present application has the following characteristics:

[0007] The crankpin of the crankshaft is arranged on the rack through a main bearing.

[0008] The two ends of the connecting rod are circular, and the inner diameter of the circular ring at the end of the connecting rod close to the crankshaft is larger than that of the other end.

[0009] The connecting rod comprises a connecting rod body, one end of the connecting rod body close to the crankshaft is semicircular, the other end of the connecting rod body away from the crankshaft is circular, the semicircular end of the connecting rod body is connected with a matched connecting rod cover, a plurality of threaded holes and a plurality of first positioning holes are respectively arranged on the two end faces of the semicircular connecting rod body, the threaded holes and the first positioning holes are arranged at intervals, a first through hole matched with the threaded hole and a second through hole matched with the first positioning hole are arranged on the connecting rod cover, a connecting rod bolt is arranged in the first through hole and the corresponding threaded hole, and a positioning pin is arranged in the first positioning hole and the second through hole; and the split type rolling bearing is attached to the inner walls of the connecting rod body and the connecting rod cover.

[0010] The split type rolling bearing comprises two matched half inner rings I and II, two matched half clamps I are arranged on the outer wall of the half inner ring I, two matched half clamps II are arranged on the outer wall of the half inner ring II, the half clamps I and the corresponding half clamps II are fixedly connected through a screw I, the outer wall center of the half inner ring I and the half inner ring II is provided with a raceway, and two matched half roller assemblies are respectively arranged in the two raceways; the two half clamps I are arranged on the two sides of the corresponding half roller assembly, the two half clamps II are arranged on the two sides of the corresponding half roller assembly, the two half roller assemblies are provided with matched half outer rings I and II on the outer sides, the outer walls of the half outer rings I and II are attached to the inner walls of the connecting rod body and the connecting rod cover, and the half outer rings I and II are positioned through a bearing pressing plate and a bolt.

[0011] The half roller assembly comprises two matched half retainers I and II, a plurality of first rollers are uniformly arranged on the half retainers I and II respectively, the first rollers are attached to the corresponding inner ring and outer ring respectively, and the half retainers I and II are fixedly connected through a screw II.

[0012] The small end bearing comprises a bearing outer ring, the bearing outer ring is attached to the circular inner ring of the connecting rod away from the crankshaft, a matched second roller is arranged at the center of the inner side of the bearing outer ring, the second roller is penetrated by a cross head pin, second positioning holes are arranged on the two sides of the cross head in the direction perpendicular to the cross head pin, third positioning holes matched with the second positioning holes are arranged on the cross head pin, and a positioning screw is arranged in the corresponding second positioning hole and third positioning hole.

[0013] Bearing retainer rings are respectively arranged on the two sides of the bearing outer ring, and the outer diameter of the bearing retainer ring is greater than the inner diameter of the circular ring of the connecting rod away from the crankshaft.

[0014] The beneficial effects of the present application are: the drilling pump connecting rod crosshead assembly with independent disassembly function breaks through the traditional connecting rod crosshead structure of the drilling pump. When repairing and replacing, the connecting rod cover and the connecting rod body are loosened, the connecting rod cover and the split type rolling bearing assembly can be removed, then the remaining assembly of the connecting rod crosshead is taken out from the inside of the pump body, all steps of disassembling the connecting rod crosshead are limited in the cavity which must be replaced due to failure, the connecting rod crosshead in the adjacent cavity is not affected and does not need to disassemble the crankshaft and main bearing, the risk of disassembling the bearing is avoided, the steps of replacing the connecting rod crosshead are reduced, the replacement difficulty is reduced, and the maintenance time is saved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a top view of the drilling pump connecting rod crosshead assembly of the present application;

[0016] Figure 2 is a front view of the drilling pump connecting rod crosshead assembly of the present application;

[0017] Figure 3 is a front view of the connecting rod in the drilling pump connecting rod crosshead assembly of the present application;

[0018] Figure 4 is a side view of the connecting rod in the drilling pump connecting rod crosshead assembly of the present application;

[0019] Figure 5 is a side sectional view of the split type rolling bearing in the drilling pump connecting rod crosshead assembly of the present application;

[0020] Figure 6 is a schematic view of the half inner ring and half clamp structure in the drilling pump connecting rod crosshead assembly of the present application;

[0021] Figure 7 is a schematic view of the half roller assembly structure in the drilling pump connecting rod crosshead assembly of the present application;

[0022] Figure 8 is a schematic view of the half outer ring structure in the drilling pump connecting rod crosshead assembly of the present application;

[0023] Figure 9 is a top sectional view of the small end bearing in the drilling pump connecting rod crosshead assembly of the present application.

[0024] In the figure, 1. connecting rod, 11. connecting rod cover, 12. connecting rod body, 13. connecting rod bolt, 14. positioning pin, 15. eyelet screw I, 16. eyelet screw II;

[0025] 2. split type rolling bearing, 21. half inner ring I, 22. half inner ring II, 23. half clamp I, 24. half clamp II, 25. screw I, 26. first roller, 27. half retainer I, 28. half retainer II, 29. screw II, 210. half outer ring I, 211. half outer ring II;

[0026] 3. Small head bearing, 31. Crosshead pin, 32. Second roller, 33. Bearing outer ring, 34. Bearing retainer;

[0027] 4. Crosshead, 41. Guide plate, 5. Set screw, 6. Bearing plate, 7. Bolt, 8. Crankshaft, 9. Frame, 10. Main bearing. DETAILED DESCRIPTION

[0028] The present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0029] The drilling pump connecting rod crosshead assembly with independent disassembly function, as shown in Figure 1 , 2 , comprises a frame 9, a crankshaft 8 vertically arranged through the frame 9, specifically, the crank 8 is arranged on the frame 9 through the main bearing 10, the crankpin of the crankshaft 8 is provided with a split rolling bearing 2, specifically, the split rolling bearing 2 is installed on the crankpin and is positioned by the steps on both sides of the crankpin to limit the axial movement of the inner ring of the bearing, the split rolling bearing 2 is provided with one end of the connecting rod 1, the other end of the connecting rod 1 is provided with the crosshead 4, specifically, the two ends of the connecting rod 1 are circular, the inner diameter of the circular ring near the crankshaft 8 is larger than that of the other end, that is, one end is a large hole end and the other end is a small hole end, the small head bearing 3 is arranged inside the small hole end of the connecting rod 1, and the crosshead 4 is fixedly connected with the small head bearing 3 through the set screw 5; the frame 9 is provided with two guide plates 41 matched with the crosshead 4, and the crosshead 4 is arranged between the two guide plates 41 and can slide forward and backward between the two guide plates 41.

[0030] Preferably, as shown in Figure 3 , the connecting rod 1 comprises a connecting rod body 12, one end of the connecting rod body 12 near the crankshaft 8 is semicircular, that is, the large hole end is semicircular and the small hole end is circular, and the semicircular end of the connecting rod body 12 is connected with a matched connecting rod cover 11, as shown in Figure 4 , a plurality of threaded holes and a plurality of first positioning holes are formed on the two end faces of the semicircular connecting rod body 12, the threaded holes and the first positioning holes are arranged at intervals, a first through hole matched with the threaded hole and a second through hole matched with the first positioning hole are formed on the connecting rod cover 11, a connecting rod bolt 13 is arranged in the first through hole and the corresponding threaded hole, and a positioning pin 14 is arranged in the first positioning hole and the second through hole, in use, the connecting rod body 12 and the connecting rod cover 11 are first positioned through the positioning pin 14 in the first positioning hole and the second through hole, and then the two are fixed through the connecting rod bolt 13 to form a complete circle, and the split rolling bearing 2 is in close contact with the inner wall of the connecting rod body 12 and the connecting rod cover 11.

[0031] Further, as shown in Figure 5 ,6 As shown, the split rolling bearing 2 includes open opposite half inner rings I 21 and half inner rings II 22, the half inner rings I 21 are provided with two matched half clamps I 23, the half inner rings II 22 are provided with two matched half clamps II 24, in use, the half inner rings I 21 and the half inner rings II 22 are combined into a complete circle through the half clamps I 23 and the corresponding half clamps II 24, the half clamps I 23 and the corresponding half clamps II 24 are fixedly connected through the screws I 25, the half inner rings I 21 and the half inner rings II 22 are provided with raceways at the center of the outer walls, two raceways are respectively provided with matched half roller assemblies, two half clamps I 23 are respectively arranged on the two sides of the corresponding half roller assemblies, and two half clamps II 24 are respectively arranged on the two sides of the corresponding half roller assemblies.

[0032] As shown, Figure 7 The half roller assembly includes open opposite half retainers I 27 and half retainers II 28, the half retainers I 27 and the half retainers II 28 are respectively and uniformly provided with a plurality of first rollers 26, and the half retainers I 27 and the half retainers II 28 are fixedly connected through the screws II 29 to combine the two into a ring-shaped whole, as shown, Figure 8 As shown, two half outer rings I 210 and half outer rings II 211 are provided on the outer sides of the two half roller assemblies, the half outer rings I 210 and the half outer rings II 211 are also provided with raceways for the working of the half roller assemblies, a plurality of first rollers 26 are respectively matched with the corresponding inner ring raceways and outer ring raceways, the outer walls of the half outer rings I 210 and the half outer rings II 211 are matched with the inner walls of the connecting rod body 12 and the connecting rod cover 11, at the same time, the inner diameter of the connecting rod body 12 and the connecting rod cover 11 is also provided with a stop edge, which can limit the half outer rings I 210 and the half outer rings II 211, avoid the half outer rings I 210 and the half outer rings II 211 moving in the longitudinal direction, the half outer rings I 210 and the half outer rings II 211 on the side away from the stop edge (i.e. the outer side) are positioned through the bearing pressing plate 6 and the bolt 7, specifically, one side edge of the half outer rings I 210 and the half outer rings II 211 is matched with the stop edge of the connecting rod body 12 and the connecting rod cover 11, and the other side is matched with the bearing pressing plate 6, the bearing pressing plate 6 is provided with a plurality of through holes, each through hole is respectively provided with a bolt 7, which is tightened into the corresponding threaded hole of the connecting rod body 12 and the connecting rod cover 11 to limit the axial movement of the half outer rings, so as to meet the axial limiting requirements of the split rolling bearing 2 and ensure the working of the connecting rod cross head at the center of the crank.

[0033] As shown, Figure 9As shown, the small end bearing 3 comprises a bearing outer ring 33 which is fitted on the outer side of the annular ring at the small end of the connecting rod 1, and a raceway is provided at the inner center of the bearing outer ring 33, and a second roller 32 is provided in the raceway, and the cross head pin 31 is fitted through the inner side of the second roller 32, and the second positioning hole is provided on the two sides of the cross head 4 in a direction perpendicular to the cross head pin 31, and the third positioning hole is provided on the cross head pin 31 and matched with the second positioning hole, and the positioning screw 5 is arranged in the corresponding second positioning hole and third positioning hole to limit the rotation and axial movement of the cross head pin 31, and the cross head pin 31 serves as the inner raceway of the small end bearing 3 and is installed in the holes on the two sides of the cross head 4 through the roller set 32, and the roller set 32 can rotate or move axially on the outer surface of the cross head pin 31 with the movement of the connecting rod 1.

[0034] The bearing retainer 34 is provided on the two sides of the bearing outer ring 33, and the outer diameter of the bearing retainer 34 is larger than the inner diameter of the annular ring at the end of the connecting rod 1 away from the crankshaft 8, so that the bearing outer ring 33 can be limited and fixed, and the axial movement of the bearing retainer 34 is avoided.

[0035] The installation steps of the drilling pump connecting rod cross head assembly with independent disassembly function are as follows:

[0036] Step 1: Assemble the second roller 32 and the bearing outer ring 33 into an integral whole, and then install them into the small end hole of the connecting rod body 12, and use two bearing retainers 34 to fix and limit;

[0037] Step 2: Insert the small hole end of the connecting rod body 12 provided with the second roller 32 and the bearing outer ring 33 into the inner cavity of the cross head 4, so that the second roller 32 is kept concentric with the holes on the two sides of the cross head 4, then pass through the cross head pin 31, align the third positioning hole on the cross head pin 31 with the second positioning hole at the front end of the cross head 4, and then insert the positioning screw 5, so as to assemble the cross head 4 and the connecting rod body 12 into an integral whole;

[0038] Step 3: Use the lifting ring screw to install the cross head 4 and the connecting rod body 12 on the guide plate 41;

[0039] Step 4: Install the crankshaft 8 and the main bearing 10 on the rack 9;

[0040] Step 5: Install the half inner ring I 21 and the half inner ring II 22 on the crank G by using two pieces of half clamp I 23 and two pieces of half clamp II 24, and tighten the screw I 25; and the half retainer I 27 and the half retainer II 28 provided with a plurality of rollers 26 are sleeved on the raceways of the half inner ring I 21 and the half inner ring II 22, and the half retainer I 27 and the half retainer II 28 are connected into an integral whole by the screw II 29 to form a complete roller set;

[0041] Step 6: Install half outer ring I 210 in the semicircular hole of the connecting rod cover 11, and install half outer ring II 211 in the semicircular hole of the connecting rod body 12, and clamp them with bearing pressing plate 6 and bolt 7 respectively; then use eye bolt I 115 and eye bolt II 116 to clamp the connecting rod body 12 and the connecting rod cover 11 on the roller 26, install the positioning pin 14, tighten the connecting rod bolt 13, and connect the connecting rod body 12 and the connecting rod cover 11 into a whole.

[0042] Step 7: Finally, remove the eye bolt I 115 and the eye bolt II 116, and complete the installation.

[0043] Note: Steps 1 and 2 are performed outside the pump body; Step 4 can also be performed before all steps.

[0044] Example 1

[0045] The drilling pump connecting rod crosshead assembly with independent disassembly function, as shown in Figure 1 , 2 , comprises a rack 9, a crankshaft 8 vertically arranged through the rack 9, specifically, the crankshaft 8 is arranged on the rack 9 through a main bearing 10 at the crank, the crankshaft 8 is provided with a split rolling bearing 2 outside the crank, specifically, the split rolling bearing 2 is installed on the crank and positioned through the steps on both sides of the crank to limit the axial movement of the inner ring of the bearing, the split rolling bearing 2 is provided with a large end of a connecting rod 1, a small end of the connecting rod 1 is sleeved with a crosshead 4, specifically, both ends of the connecting rod 1 are circular, the diameter of the circular ring at one end of the connecting rod 1 close to the crankshaft 8 is larger than that at the other end, that is, one end is a large hole end and the other end is a small hole end, a small end bearing 3 is arranged inside the end of the connecting rod 1 close to the crosshead 4, and the crosshead 4 is fixedly connected with the small end bearing 3 through a positioning screw 5; the rack 9 is provided with two sets of guide plates 41 matched with the crosshead 4, and the crosshead 4 slides back and forth between the two sets of guide plates 41.

[0046] Example 2

[0047] The drilling pump connecting rod crosshead assembly with independent disassembly function, as shown in Figure 1 , 2 , comprises a rack 9, a crankshaft 8 vertically arranged through the rack 9, specifically, the crankshaft 8 is arranged on the rack 9 through a main bearing 10 at the crank, the crankshaft 8 is provided with a split rolling bearing 2 outside the crank, specifically, the split rolling bearing 2 is installed on the crank and positioned through the steps on both sides of the crank to limit the axial movement of the inner ring of the bearing, the split rolling bearing 2 is provided with a large end of a connecting rod 1, a small end of the connecting rod 1 is sleeved with a crosshead 4, the end of the connecting rod 1 close to the crosshead 4 is provided with a small end bearing 3 inside, and the crosshead 4 is fixedly connected with the small end bearing 3 through a positioning screw 5; the rack 9 is provided with two sets of guide plates 41 matched with the crosshead 4, and the crosshead 4 slides back and forth between the two sets of guide plates 41.

[0048] Preferably, as shown in Figure 3 The connecting rod 1 includes a connecting rod body 12, which is semicircular at one end close to the crankshaft 8 and circular at the other end away from the crankshaft 8. The semicircular end of the connecting rod body 12 is connected with a matching connecting rod cover 11, as shown in Figure 4 A plurality of threaded holes and a plurality of first positioning holes are respectively formed on the two end faces of the semicircular connecting rod body 12, and the threaded holes and the first positioning holes are arranged at intervals. A first through hole matched with the threaded holes and a second through hole matched with the first positioning holes are formed on the connecting rod cover 11. A connecting rod bolt 13 is arranged in the first through hole and the corresponding threaded hole, and a positioning pin 14 is arranged in the first positioning hole and the second through hole. In use, the connecting rod body 12 and the connecting rod cover 11 are first positioned by the positioning pin 14 in the first positioning hole and the second through hole, and then fixed by the connecting rod bolt 13, forming a complete circle, and the split rolling bearing 2 is attached to the inner wall of the connecting rod body 12 and the connecting rod cover 11.

[0049] Example 3

[0050] The drilling pump connecting rod crosshead assembly with independent disassembly function, as shown in Figure 1 , 2 includes a rack 9, and a crankshaft 8 vertically arranged on the rack 9. Specifically, the crank of the crankshaft 8 is arranged on the rack 9 through a main bearing 10. The crankpin of the crankshaft 8 is sleeved with a split rolling bearing 2. Specifically, the split rolling bearing 2 is installed on the crankpin and positioned by the steps on both sides of the crankpin to limit the axial movement of the inner ring of the bearing. The split rolling bearing 2 is sleeved with the large end of a connecting rod 1. The small end of the connecting rod 1 is sleeved with a crosshead 4. The end of the connecting rod 1 close to the crosshead 4 is internally provided with a small end bearing 3. The crosshead 4 and the small end bearing 3 are fixedly connected through a positioning screw 5. The rack 9 is provided with two groups of guide plates 41 matched with the crosshead 4. The crosshead 4 slides back and forth between the two groups of guide plates 41.

[0051] Preferably, as shown in Figure 3 The connecting rod 1 includes a connecting rod body 12, which is semicircular at one end close to the crankshaft 8 and circular at the other end away from the crankshaft 8. The semicircular end of the connecting rod body 12 is connected with a matching connecting rod cover 11, as shown in Figure 4As shown, a plurality of threaded holes and a plurality of first positioning holes are respectively provided on the two semicircular end faces of the connecting rod body 12, and the plurality of threaded holes and the first positioning holes are arranged at intervals. A first through hole matching the threaded hole and a second through hole matching the first positioning hole are provided on the connecting rod cover 11. Connecting rod bolts 13 are provided in the first through hole and the corresponding threaded hole, and positioning pins 14 are provided in the first positioning hole and the second through hole. When in use, the connecting rod body 12 and the connecting rod cover 11 are first positioned by the positioning pins 14 in the first positioning hole and the second through hole, and then the two are fixed by the connecting rod bolts 13 to form a complete circle, and the split rolling bearing 2 fits well with the inner walls of the connecting rod body 12 and the connecting rod cover 11.

[0052] Further, such as Figure 5 、 6 As shown, the split rolling bearing 2 includes a half inner ring I21 and a half inner ring II22 with openings facing each other. The outer ring of the half inner ring I21 is fitted with two matching half clamps I23, and the outer ring of the half inner ring II22 is fitted with two matching half clamps II24. The half clamps I23 and the corresponding half clamps II24 are fixedly connected by screws I25. Raceways are provided at the centers of the outer walls of the half inner ring I21 and the half inner ring II22. Matching half roller assemblies are respectively provided in the two raceways. The two half clamps I23 are respectively arranged on both sides of the corresponding half roller assemblies, and the two half clamps II24 are respectively arranged on both sides of the corresponding half roller assemblies.

[0053] like Figure 7 As shown, the half roller assembly includes a half cage I 27 and a half cage II 28 that are open and facing each other. The half cage I 27 and the half cage II 28 are respectively evenly provided with a plurality of first rollers 26. The half cage I 27 and the half cage II 28 are fixedly connected by screws II 29 to form a ring-shaped whole. Figure 8 As shown, the outer sides of the two half-roller assemblies are provided with matching half outer rings I 210 and half outer rings II 211. Both half outer rings I 210 and half outer rings II 211 are also provided with raceways for the half-roller assemblies to work. A number of first rollers 26 are respectively fitted with the corresponding inner rings and outer rings. The outer walls of the half outer rings I 210 and half outer rings II 211 are fitted with the inner walls of the connecting rod body 12 and the connecting rod cover 11. The half outer rings I 210 and half outer rings II 211 are both fixed by the bearing pressure plate 6 and the bolts. 7 is positioned, specifically: one side of the half outer ring I 210 and the half outer ring II 211 is in contact with the ribs of the connecting rod body 12 and the connecting rod cover 11, and the other side is provided with a bearing pressure plate 6, the bearing pressure plate 6 is provided with a plurality of through holes, each of which is provided with a bolt 7, which is tightened to the corresponding threaded holes of the connecting rod body 12 and the connecting rod cover 11 to limit the axial movement of the bearing outer ring, thereby meeting the axial limit requirements of the split rolling bearing 2 and ensuring that the connecting rod crosshead works at the center of the crank.

[0054] Example 4

[0055] Drilling pump connecting rod crosshead assembly with independent disassembly and assembly function, such as Figure 1 、 2 As shown, the frame 9 includes a crankshaft 8 that is vertically arranged therewith and passes through it. The crankshaft 8 has a split rolling bearing 2 provided on its crank sleeve. Specifically, the split rolling bearing 2 is installed on the crank and is positioned by steps on both sides of the crank to limit the axial movement of the inner ring of the bearing. The split rolling bearing 2 is provided with a large end of a connecting rod 1 on its sleeve, and a crosshead 4 is provided on the small end of the connecting rod 1. A small head bearing 3 is provided inside the end of the connecting rod 1 close to the crosshead 4, and the crosshead 4 and the small head bearing 3 are fixedly connected by a positioning screw 5; two groups of guide plates 41 that cooperate with the crosshead 4 are provided on the frame 9, and the crosshead 4 slides back and forth between the two groups of guide plates 41.

[0056] like Figure 9 As shown, the small head bearing 3 includes a bearing outer ring 33, which is fitly arranged in the circular ring at the end of the connecting rod 1 away from the crankshaft 8. A matching second roller 32 is provided at the center of the bearing outer ring 33, and a crosshead pin 31 is fitly passed through the inside of the second roller 32. Second positioning holes are respectively provided on both sides of the crosshead 4 in a direction perpendicular to the crosshead pin 31, and a third positioning hole matching the second positioning hole is provided on the crosshead pin 31. The positioning screw 5 is provided in the corresponding second positioning hole and the third positioning hole to limit the rotation and axial movement of the crosshead pin 31. The crosshead pin 31 serves as the inner raceway of the small head bearing 3, passes through the roller group 32 and is installed in the holes on both sides of the crosshead 4. The roller group 32 can rotate or move axially on the outer surface of the crosshead pin 31 as the connecting rod 1 moves.

[0057] Bearing retaining rings 34 are respectively provided on both sides of the bearing outer ring 33. The outer diameter of the bearing retaining ring 34 is larger than the inner diameter of the ring at the end of the connecting rod 1 away from the crankshaft 8, which is convenient for limiting and fixing the bearing outer ring 33 and preventing the bearing outer ring 33 from axial movement.

Claims

1. A drilling pump connecting rod crosshead assembly having independent disassembly capability, characterized by, The application relates to a connecting rod and a crankshaft, which comprises a rack (9) and a crankshaft (8) vertically arranged on the rack (9), wherein the crankpin of the crankshaft (8) is provided with a split rolling bearing (2), one end of a connecting rod (1) is sleeved on the split rolling bearing (2), the other end of the connecting rod (1) is sleeved with a crosshead (4), a wrist pin bearing (3) is arranged in the end of the connecting rod (1) close to the crosshead (4), and the crosshead (4) and the wrist pin bearing (3) are fixedly connected through a positioning screw (5). Two guide plates (41) matched with the crosshead (4) are arranged on the rack (9) and the crosshead (4) is arranged between the two guide plates (41).

2. The connecting rod and crosshead assembly of claim 1, wherein: The crankshaft (8) is arranged on the rack (9) through a main bearing (10) at the crank.

3. The drill pump connecting rod and crosshead assembly with independent disassembly function according to claim 1, characterized in that, The two ends of the connecting rod (1) are circular rings, and the inner diameter of the end of the connecting rod (1) close to the crankshaft (8) is larger than that of the other end.

4. The drill pump connecting rod and crosshead assembly with independent disassembly function according to claim 3, characterized in that, The connecting rod (1) comprises a connecting rod body (12), the end of the connecting rod body (12) close to the crankshaft (8) is semicircular, the other end of the connecting rod body (12) is circular, the semicircular end of the connecting rod body (12) is connected with a matched connecting rod cover (11), a plurality of threaded holes and a plurality of first positioning holes are arranged on the two end faces of the semicircular connecting rod body (12), the threaded holes and the first positioning holes are arranged at intervals, a first through hole matched with the threaded hole and a second through hole matched with the first positioning hole are arranged on the connecting rod cover (11), a connecting rod bolt (13) is arranged in the first through hole and the corresponding threaded hole, a positioning pin (14) is arranged in the first positioning hole and the second through hole, and the split rolling bearing (2) is attached to the inner wall of the connecting rod body (12) and the connecting rod cover (11).

5. The drill pump connecting rod and crosshead assembly with independent disassembly function according to claim 4, characterized in that, The split rolling bearing (2) comprises two split half inner rings (21) and (22), two matched half clamps (23) are attached to the outer wall of the half inner ring (21), two matched half clamps (24) are attached to the outer wall of the half inner ring (22), the half clamp (23) and the corresponding half clamp (24) are fixedly connected through a screw (25), a raceway is arranged at the center of the outer wall of the half inner ring (21) and the half inner ring (22), two matched half roller assemblies are arranged in the two raceways, the two half clamps (23) are arranged on the two sides of the corresponding half roller assembly, the two half clamps (24) are arranged on the two sides of the corresponding half roller assembly, two matched half outer rings (210) and (211) are arranged on the outer sides of the two half roller assemblies, the outer walls of the half outer rings (210) and (211) are attached to the inner walls of the connecting rod body (12) and the connecting rod cover (11), and the half outer rings (210) and (211) are positioned through a bearing pressing plate (6) and a bolt (7).

6. The drill pump connecting rod and crosshead assembly with independent disassembly function according to claim 5, characterized in that, The half-roller assembly comprises half-retainers I (27) and II (28) with opposite openings, the half-retainers I (27) and II (28) are uniformly provided with a plurality of first rollers (26) respectively, the first rollers (26) are attached to the corresponding inner ring and outer ring respectively, and the half-retainers I (27) and II (28) are fixedly connected by a screw II (29).

7. The drill pump connecting rod and crosshead assembly with independent disassembly function according to claim 1, characterized in that, The small-end bearing (3) comprises a bearing outer ring (33), the bearing outer ring (33) is attached to the outer side of the circular ring-shaped inner side of the connecting rod (1) far away from the crankshaft (8), the bearing outer ring (33) is provided with a second roller (32) at the center of the inner side, the second roller (32) is penetrated by a crosshead pin (31) at the inner side, the crosshead (4) is provided with a second positioning hole at the two sides in the direction perpendicular to the crosshead pin (31), the crosshead pin (31) is provided with a third positioning hole matched with the second positioning hole, and the positioning screw (5) is arranged in the corresponding second positioning hole and third positioning hole.

8. The drill pump connecting rod and crosshead assembly with independent disassembly function according to claim 7, characterized in that, The bearing outer ring (33) is respectively sleeved with a bearing retainer (34) at the two sides, and the outer diameter of the bearing retainer (34) is greater than the inner diameter of the circular ring of the connecting rod (1) far away from the crankshaft (8).

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