CN221003090U - Connecting rod cross head assembly and plunger pump - Google Patents

Abstract

The present application relates to a connecting rod crosshead assembly and a plunger pump. The crosshead assembly includes a crosshead, a connecting rod and a shaft pin. The crosshead is provided with an arc groove and a first mounting hole. One end of the connecting rod is in an arc shape and is located in the arc groove. The connecting rod is also provided with a second mounting hole corresponding to the first mounting hole. The connecting rod is penetrated with a first oil hole along the length direction. The pin extends into the first mounting hole and the second mounting hole so that the connecting rod is rotatably connected to the crosshead. The pin is provided with a second oil hole so that the two first oil holes located at both ends of the second mounting hole are connected. The pin rotatably connects the crosshead to the connecting rod. The arc setting and the arc groove setting of the connecting rod increase the contact area between the connecting rod and the crosshead, reduce the stress generated, and reduce wear and cracking. The second oil hole of the pin can transport the lubricating oil in the first oil hole to the arc groove, reduce the friction between the connecting rod and the crosshead, and further reduce the wear and cracking of the connecting rod and the crosshead.

Description

Connecting rod crosshead assembly and plunger pump

Technical Field

The present application relates to the field of plunger pumps, and in particular to a connecting rod crosshead assembly and a plunger pump.

Background technique

As an important part of fracturing equipment, the plunger pump is used to pressurize the sand-carrying fracturing fluid and pump it into the well to create cracks in the formation and achieve fracturing and production increase. The performance of the plunger pump directly affects the technical level of fracturing operations in oil and gas fields. At present, the structure of fracturing plunger pumps at home and abroad mostly adopts horizontal reciprocating multi-cylinder plunger pumps, such as three-cylinder plunger pumps and five-cylinder plunger pumps, which usually consist of a power end and a hydraulic end. The function of the power end is to transmit the power of the prime mover to the hydraulic end through the reduction transmission system and the crank-connecting rod mechanism; the function of the hydraulic end is to convert the mechanical energy transmitted from the power end into the pressure energy of the working medium.

As an important part of the plunger pump, the connecting rod crosshead assembly forms a crank-connecting rod mechanism with the crankshaft, bearings and other components. One end of the connecting rod crosshead assembly is connected to the crankshaft, and the other end is connected to the hydraulic end plunger, converting the rotary motion of the prime mover into reciprocating linear motion to achieve pumping operations at the fracturing site. During the operation of the plunger pump, the connecting rod crosshead assembly must withstand the load transmitted by the high-pressure medium and the reciprocating inertia load. It must not only ensure the structural strength, but also ensure the lubrication effect of each rotating component and moving component to avoid ablation during the process.

At present, the connecting rod and the crosshead of the commonly used connecting rod crosshead structure are connected by a crosshead pin. The crosshead pin bears the working load transmitted by the high-pressure medium. Since the contact area between the crosshead pin and the crosshead is small, the stress generated is large, and wear and cracking problems will occur in the contact area between the crosshead pin and the crosshead.

Utility Model Content

The purpose of the present application is to provide a connecting rod crosshead assembly and a plunger pump, wherein the connecting rod crosshead assembly rotatably connects the crosshead to the connecting rod through a pin shaft, and the arc setting at one end of the connecting rod and the arc groove setting of the crosshead increase the contact area between the connecting rod and the crosshead, reduce the generated stress, and reduce wear and cracking.

To this end, in a first aspect, an embodiment of the present application provides a connecting rod crosshead assembly, comprising: a crosshead provided with an arc-shaped groove, the crosshead also provided with a first mounting hole; a connecting rod, one end of which is arc-shaped and located in the arc-shaped groove, the connecting rod also provided with a second mounting hole corresponding to the first mounting hole, the connecting rod having a first oil hole passing through it along the length direction, and an extension path of the first oil hole passing through the second mounting hole; a pin shaft extending into the first mounting hole and the second mounting hole to enable the connecting rod to be rotatably connected to the crosshead, the pin shaft being provided with a second oil hole, and the second oil hole connecting the two first oil holes located at both ends of the second mounting hole.

In a possible implementation, an annular first oil groove is further provided on the outer peripheral side of the pin shaft, and the first oil groove is connected to the first oil hole and the second oil hole.

In a possible implementation, a bushing is provided in the first mounting hole, the end of the pin shaft is rotatably connected to the crosshead through the bushing, and the pin shaft is also provided with a third oil hole, one end of the third oil hole is connected to the second oil hole and the other end faces the bushing.

In a possible implementation, a bushing is disposed in the second mounting hole, the pin shaft is rotatably connected to the connecting rod through the bushing, the bushing is provided with an oil hole connected to the first oil hole and the second oil hole, and an annular second oil groove is also provided on the inner side of the bushing.

In a possible implementation, an elastic retaining ring is further provided at the end of the pin shaft.

In a possible implementation, an adaptive arc-shaped bearing shell is disposed in the arc-shaped groove, and one end of the connecting rod facing the arc-shaped groove is adapted to the bearing shell.

In a possible implementation, a third oil groove is further provided on the inner side of the bearing shell. The third oil groove extends along the circumference of the bearing shell, and the third oil groove is communicated with the first oil hole.

In a possible implementation, a guide plate is connected to the outer surface of the crosshead, a first clamping portion is provided on the side of the guide plate facing the crosshead, and a second clamping portion adapted to the first clamping portion is provided on the outer surface of the crosshead, one of the first clamping portion and the second clamping portion is a groove, and the other is a protrusion.

In a possible implementation, the first clamping portion extends along the width direction of the guide plate, and a plurality of the first clamping portions are provided and arranged along the length direction of the guide plate; the second clamping portion extends along the width direction of the crosshead, and a plurality of the second clamping portions are provided and arranged along the length direction of the guide plate.

In a second aspect, an embodiment of the present application provides a plunger pump, comprising a connecting rod crosshead assembly as described in any one of the above items.

According to a connecting rod crosshead assembly and a plunger pump provided in an embodiment of the present application, the crosshead assembly includes a crosshead, a connecting rod and an axle pin, the crosshead is provided with an arc-shaped groove, and the crosshead is also provided with a first mounting hole; one end of the connecting rod is arc-shaped and located in the arc-shaped groove, and the connecting rod is also provided with a second mounting hole corresponding to the first mounting hole, and the connecting rod is penetrated by a first oil hole along the length direction, and an extension path of the first oil hole penetrates the second mounting hole; the pin shaft extends into the first mounting hole and the second mounting hole to enable the connecting rod to be rotatably connected to the crosshead, and the pin shaft is provided with a second oil hole, and the second oil hole connects the two first oil holes located at both ends of the second mounting hole. The pin shaft rotatably connects the crosshead and the connecting rod. The arc setting at one end of the connecting rod and the arc-shaped groove setting of the crosshead increase the contact area between the connecting rod and the crosshead, reduce the stress generated, and reduce wear and cracking. At the same time, the second oil hole of the pin shaft connects the two first oil holes located at both ends of the second mounting hole, so that the lubricating oil in the first oil hole can be transported to the arc-shaped groove, thereby reducing the friction between the connecting rod and the crosshead, and further reducing the wear and cracking of the connecting rod and the crosshead.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

FIG1 shows an exploded view of a connecting rod crosshead assembly provided in an embodiment of the present application;

FIG2 shows a cross-sectional view of a crosshead provided in an embodiment of the present application;

FIG3 shows a cross-sectional view along the horizontal direction of a connecting rod crosshead assembly provided in an embodiment of the present application;

FIG4 shows a cross-sectional view along the vertical direction of a connecting rod crosshead assembly provided in an embodiment of the present application;

FIG5 shows a partial schematic diagram of FIG4 ;

FIG6 shows a schematic structural diagram of a plunger pump provided in an embodiment of the present application.

Description of reference numerals:

1. Crosshead; 11. Arc-shaped groove; 12. First mounting hole; 13. Second engaging part; 2. Connecting rod; 21. Second mounting hole; 22. First oil hole; 3. Pin; 31. Second oil hole; 32. First oil groove; 33. Third oil hole; 34. Circlip; 4. Pull rod; 5. Bushing; 6. Bushing; 61. Second oil groove; 7. Bearing; 71. Third oil groove; 8. Guide plate; 81. First engaging part.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and/or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and/or settings discussed.

For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

Figure 1 shows an exploded view of a connecting rod crosshead assembly provided in an embodiment of the present application, Figure 2 shows a cross-sectional view of a crosshead provided in an embodiment of the present application, and Figure 3 shows a cross-sectional view of a connecting rod crosshead assembly provided in the horizontal direction in an embodiment of the present application.

As shown in Figures 1 to 3, an embodiment of the present application provides a connecting rod crosshead assembly, including a crosshead 1, a connecting rod 2 and a pin 3. The crosshead 1 is provided with an arc-shaped groove 11, and the crosshead 1 is also provided with a first mounting hole 12; one end of the connecting rod 2 is arc-shaped and is located in the arc-shaped groove 11, and the connecting rod 2 is also provided with a second mounting hole 21 corresponding to the first mounting hole 12, and the connecting rod 2 is penetrated by a first oil hole 22 along the length direction, and the extension path of the first oil hole 22 penetrates the second mounting hole 21; the pin 3 extends into the first mounting hole 12 and the second mounting hole 21 so that the connecting rod 2 is rotatably connected to the crosshead 1, and the pin 3 is provided with a second oil hole 31, and the second oil hole 31 connects the two first oil holes 22 located at both ends of the second mounting hole 21.

It should be understood that the connecting rod crosshead assembly includes a crosshead 1, which is provided with an inner cavity, and an arc-shaped groove 11 is provided in the inner cavity of the crosshead 1. The crosshead 1 is also connected to a tie rod 4, which is located on the side of the crosshead 1 away from the opening of the arc-shaped groove 11, and the tie rod 4 is connected to the crosshead 1 through bolts and cylindrical pins. The cylindrical pins bear a certain load to reduce the force on the bolts. The tie rod 4 is connected to the plunger on the hydraulic end to transmit power to the hydraulic end. Among them, the crosshead 1 is also provided with a first mounting hole 12, which passes through the crosshead 1 and the penetration direction is perpendicular to the length direction of the tie rod 4, and the first mounting hole 12 is also connected to the inner cavity of the arc-shaped groove 11.

The connecting rod crosshead assembly also includes a connecting rod 2, which is provided with a first end and a second end along the length direction. The first end of the connecting rod 2 is in an arc shape and is located in an arc groove 11, that is, the first end of the connecting rod 2 is rotatably connected with the crosshead 1 and forms a revolving pair, and the connecting rod 2 bears the working load F transmitted by the hydraulic end through the crosshead 1. Since the arc setting of the first end of the connecting rod 2 and the arc groove 11 of the crosshead 1 increase the contact area between the connecting rod 2 and the crosshead 1, the stress generated can be reduced, and the wear and cracking of the connecting rod 2 and the crosshead 1 can be reduced. The second end of the connecting rod 2 is assembled on the crankshaft throw to form a revolving kinematic pair with the crankshaft.

When the plunger pump is running, the external power source drives the crankshaft to perform rotational motion, drives the connecting rod 2 to swing back and forth, and drives the crosshead 1 to perform reciprocating linear motion, thereby converting the rotational motion of the external power source into reciprocating linear motion and transmitting it to the hydraulic end, thereby realizing the suction and discharge of the working medium.

The connecting rod 2 is provided with a first oil hole 22, which penetrates the connecting rod 2 along the length direction, and the first oil hole 22 is connected to the arc groove 11. Lubricating oil can be transported from the first oil hole 22 to the arc groove 11, thereby lubricating the connecting rod 2 and the crosshead 1, reducing the friction between the connecting rod 2 and the crosshead 1, and further reducing the wear and cracking of the connecting rod 2 and the crosshead 1. The connecting rod 2 is also provided with a second mounting hole 21 corresponding to the first mounting hole 12, and the second mounting hole 21 penetrates along the thickness direction of the connecting rod 2. When the first end of the connecting rod 2 extends into the arc groove 11, the second mounting hole 21 is connected to the first mounting hole 12. However, due to the setting of the second mounting hole 21, the first oil hole 22 is split by the second mounting hole 21, forming two first oil holes 22.

The connecting rod crosshead assembly also includes a pin shaft 3, which is cylindrical. When the connecting rod 2 is located in the arc-shaped groove 11, the first mounting hole 12 corresponds to the second mounting hole 21. At this time, the pin shaft 3 extends into the first mounting hole 12 and the second mounting hole 21, so that the connecting rod 2 is rotatably connected to the crosshead 1. The connection mode can be that the connecting rod 2 can be fixedly connected to the pin shaft 3, and the crosshead 1 is rotatably connected to the pin shaft 3; or the connecting rod 2 is rotatably connected to the pin shaft 3, and the crosshead 1 is fixedly connected to the pin shaft 3; or the connecting rod 2 is rotatably connected to the pin shaft 3, and the crosshead 1 is rotatably connected to the pin shaft 3. The pin shaft 3 only plays a hinge role and does not bear the axial load F transmitted by the hydraulic end.

The pin shaft 3 is also provided with a second oil hole 31 connected to the first oil hole 22, so that the two first oil holes 22 located at both ends of the second mounting hole 21 are connected, so that the lubricating oil in the first oil hole 22 can be transported to the arc-shaped groove 11, thereby reducing the friction between the connecting rod 2 and the crosshead 1, thereby reducing wear and cracking.

The present application rotatably connects the crosshead 1 and the connecting rod 2 through the pin 3, that is, one end of the connecting rod 2 is located in the arc groove 11 of the crosshead 1 and forms a rotating pair with the crosshead 1. The arc setting of the first end of the connecting rod 2 and the arc groove 11 of the crosshead 1 increase the contact area between the connecting rod 2 and the crosshead 1, reduce the stress generated, and reduce wear and cracking. The crosshead 1 is a semicircular integral structure with good structural rigidity. It can reduce the width dimension while ensuring a certain bearing area, thereby reducing the cylinder spacing and width of the entire pump. At the same time, the second oil hole 31 of the pin 3 connects the two first oil holes 22 located at both ends of the second mounting hole 21, so that the lubricating oil in the first oil hole 22 can be transported to the arc groove 11, reducing the friction between the connecting rod 2 and the crosshead 1, and further reducing the wear and cracking of the connecting rod 2 and the crosshead 1.

Referring to FIG. 1 , in some optional embodiments, the outer peripheral side of the pin shaft 3 is further provided with an annular first oil groove 32, and the first oil groove 32 is connected with the first oil hole 22 and the second oil hole 31. When the pin shaft 3 and the connecting rod 2 rotate relative to each other, the lubricating oil in the first oil hole 22 can also flow from the first oil groove 32 to the second oil hole 31, and can also flow from the second oil hole 31 to the first oil hole 22, so that the lubricating oil can smoothly flow from the first oil hole 22 to the arc groove 11, so that the lubricating oil can lubricate the connecting rod 2 and the crosshead 1. At the same time, the lubricating oil can also be lubricated and stored in the first oil groove 32 to reduce the friction and wear between the pin shaft 3 and the connecting rod 2, and improve the smoothness of the rotation between the pin shaft 3 and the connecting rod 2.

The second oil holes 31 extend in the radial direction of the pin shaft 3 and are provided with two of them. The two second oil holes 31 are perpendicular to each other. The provision of the two second oil holes 31 can further increase the speed of lubricating oil delivery.

Referring to Figures 4 and 5, Figure 4 shows a cross-sectional view of a connecting rod crosshead assembly provided by an embodiment of the present application along the vertical direction, and Figure 5 shows a partial schematic diagram of Figure 4. In some optional embodiments, a bushing 5 is provided in the first mounting hole 12, and the end of the pin shaft 3 is rotatably connected to the crosshead 1 through the bushing 5. The pin shaft 3 is also provided with a third oil hole 33, one end of the third oil hole 33 is connected to the second oil hole 31 and the other end faces the bushing 5.

The material of the bushing 5 is generally copper alloy. The bushing 5 is located in the first mounting hole 12 and is connected to the crosshead 1. Two bushings 5 are provided. The two ends of the pin 3 respectively extend into the inner cavities of the two bushings 5 and are rotatably connected with the bushings 5, thereby making the pin 3 rotatably connected to the crosshead 1. The provision of the bushing 5 can reduce the damage to the crosshead 1 when the pin 3 rotates relative to the crosshead 1. When the bushing 5 is damaged, the bushing 5 can also be removed from the crosshead 1 for replacement, thereby increasing the service life of the crosshead 1.

The pin shaft 3 is also provided with a third oil hole 33, one end of the third oil hole 33 is connected to the second oil hole 31 and the other end faces the bushing 5, so that the lubricating oil can flow from the second oil hole 31 to the third oil hole 33, and then flow from the third oil hole 33 to between the bushing 5 and the pin shaft 3, thereby improving the smoothness of rotation between the bushing 5 and the pin shaft 3, and also reducing the friction between the pin shaft 3 and the bushing 5, thereby reducing the loss of the pin shaft 3 and the bushing 5.

1 and 5, in some optional embodiments, a sleeve 6 is provided in the second mounting hole 21, the pin 3 is rotatably connected to the connecting rod 2 through the sleeve 6, the sleeve 6 is provided with an oil hole communicating with the first oil hole 22 and the second oil hole 31, and an annular second oil groove 61 is also provided on the inner side of the sleeve 6. The sleeve 6 is generally made of copper alloy material, the sleeve 6 extends into the second mounting hole 21 of the connecting rod 2 and is connected to the connecting rod 2, the sleeve 6 is interference fitted into the second mounting hole 21 of the connecting rod 2, the pin 3 is rotatably connected to the sleeve 6, and the pin 3 is rotatably connected to the connecting rod 2. The provision of the sleeve 6 can reduce the damage to the connecting rod 2 when the pin 3 rotates relative to the connecting rod 2. When the sleeve 6 is damaged, the sleeve 6 can be removed from the connecting rod 2 for replacement, thereby increasing the service life of the connecting rod 2.

The shaft sleeve 6 is provided with an oil hole, so that the first oil hole 22 and the second oil hole 31 can be connected, without affecting the transition of the lubricating oil from the first oil hole 22 to the second oil hole 31 or from the second oil hole 31 to the first oil hole 22 .

The sleeve 6 is also provided with a second annular oil groove 61, so that the lubricating oil can be stored between the pin shaft 3 and the sleeve 6, thereby improving the smoothness of rotation between the pin shaft 3 and the sleeve 6, while also reducing the friction between the pin shaft 3 and the sleeve 6, and reducing the loss of the pin shaft 3 and the sleeve 6.

5 , in some optional embodiments, an elastic retaining ring 34 is further provided at the end of the pin shaft 3, and two elastic retaining rings 34 are provided and respectively located at the two ends of the pin shaft 3, so as to limit the axial position of the pin shaft 3, thereby preventing the pin shaft 3 from axially moving in the second mounting hole 21 and the first mounting hole 12, and preventing the first oil hole 22, the second oil hole 31, and the first oil groove 32 from being misaligned.

Referring to Fig. 1, in some optional embodiments, an arc-shaped bearing bush 7 is provided in the arc-shaped groove 11, and one end of the connecting rod 2 facing the arc-shaped groove 11 is adapted to the inner cavity of the bearing bush 7. The bearing bush 7 extends into the arc-shaped groove 11 of the crosshead 1 and is connected to the crosshead 1, and the connecting rod 2 extends into the inner cavity of the bearing bush 7 and is rotatably connected to the bearing bush 7, thereby making the connecting rod 2 rotatably connected to the crosshead 1. The provision of the bearing bush 7 can reduce the damage to the crosshead 1 when the connecting rod 2 rotates relative to the crosshead 1. When the bearing bush 7 is damaged, the bearing bush 7 can be removed from the crosshead 1 for replacement, thereby increasing the service life of the crosshead 1.

In some optional embodiments, a third oil groove 71 is further provided on the inner side of the bearing shell 7, the third oil groove 71 extends along the circumference of the bearing shell 7, and the third oil groove 71 is connected with the first oil hole 22. The lubricating oil in the first oil hole 22 can flow into the third oil groove 71, and the third oil groove 71 can store the lubricating oil between the connecting rod 2 and the bearing shell 7, thereby improving the smoothness of the rotation between the connecting rod 2 and the bearing shell 7, and also reducing the friction between the connecting rod 2 and the bearing shell 7, thereby reducing the loss of the connecting rod 2 and the bearing shell 7.

1 and 2, in some optional embodiments, a guide plate 8 is connected to the outer surface of the crosshead 1, a first clamping portion 81 is provided on the side of the guide plate 8 facing the crosshead 1, and a second clamping portion 13 adapted to the first clamping portion 81 is provided on the outer surface of the crosshead 1, one of the first clamping portion 81 and the second clamping portion 13 is a groove, and the other is a protrusion.

The guide plate 8 is generally made of copper alloy, wherein the guide plate 8 is connected to the crosshead 1 by bolts, and the crosshead 1 with the guide plate 8 is assembled in the upper and lower slide rails of the power end to form a sliding pair. The guide plate 8 is provided with a first clamping portion 81, and the crosshead 1 is provided with a second clamping portion 13. The first clamping portion 81 is clamped with the second clamping portion 13. When the crosshead 1 moves, the first clamping portion 81 and the second clamping portion 13 can withstand the sliding friction generated by the movement of the crosshead 1, reduce the force on the bolts, and improve the stability of the connection between the guide plate 8 and the crosshead 1.

In one example, the first engaging portion 81 is a groove, and the second engaging portion 13 is a protrusion adapted to the groove.

In one example, the first engaging portion 81 is a protrusion, and the second engaging portion 13 is a groove adapted to the protrusion.

In some optional embodiments, the first clamping portion 81 extends along the width direction of the guide plate 8, and the first clamping portion 81 is provided in plurality and arranged along the length direction of the guide plate 8, and the second clamping portion 13 extends along the width direction of the crosshead 1, and the second clamping portion 13 is provided in plurality and arranged along the length direction of the crosshead 1.

The plurality of first engaging portions 81 are arranged at intervals along the length direction of the guide plate 8, and the plurality of second engaging portions 13 are arranged at intervals along the length direction of the crosshead 1. The provision of the plurality of first engaging portions 81 and the plurality of second engaging portions 13 further improves the stability of the connection between the guide plate 8 and the crosshead 1.

In some optional embodiments, the outer surface of the guide plate 8 is further provided with axial and radial oil grooves for storing lubricating oil and lubricating the moving parts.

Referring to Figures 1 to 6, Figure 6 shows a schematic diagram of the structure of a plunger pump provided in an embodiment of the present application. The present application also includes a plunger pump, and the plunger pump includes any of the connecting rod crosshead assemblies described above.

A connecting rod crosshead assembly includes a crosshead 1, a connecting rod 2 and a pin 3. The crosshead 1 is provided with an arc-shaped groove 11, and the crosshead 1 is also provided with a first mounting hole 12; one end of the connecting rod 2 is arc-shaped and located in the arc-shaped groove 11, and the connecting rod 2 is also provided with a second mounting hole 21 corresponding to the first mounting hole 12. The connecting rod 2 is penetrated by a first oil hole 22 along the length direction, and the extension path of the first oil hole 22 penetrates the second mounting hole 21; the pin 3 extends into the first mounting hole 12 and the second mounting hole 21 so that the connecting rod 2 is rotatably connected to the crosshead 1, and the pin 3 is provided with a second oil hole 31 connected to the first oil hole 22 so that the two first oil holes 22 located at both ends of the second mounting hole 21 are connected.

The pin shaft 3 rotationally connects the crosshead 1 and the connecting rod 2, that is, one end of the connecting rod 2 is located in the arc groove 11 of the crosshead 1 and forms a rotating pair with the crosshead 1. The arc setting of the first end of the connecting rod 2 and the arc groove 11 of the crosshead 1 increase the contact area between the connecting rod 2 and the crosshead 1, reduce the stress generated, and reduce wear and cracking. At the same time, the second oil hole 31 of the pin shaft 3 connects the two first oil holes 22 located at both ends of the second mounting hole 21, so that the lubricating oil in the first oil hole 22 can be transported to the arc groove 11, thereby reducing the friction between the connecting rod 2 and the crosshead 1, and further reducing the wear and cracking of the connecting rod 2 and the crosshead 1.

It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and/or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and/or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A connecting rod crosshead assembly, characterized by comprising: A crosshead is provided with an arc-shaped groove, and the crosshead is also provided with a first mounting hole; A connecting rod, one end of which is arc-shaped and located in the arc-shaped groove, the connecting rod is further provided with a second mounting hole corresponding to the first mounting hole, the connecting rod is penetrated by a first oil hole along the length direction, and the extension path of the first oil hole penetrates the second mounting hole; A pin shaft extends into the first mounting hole and the second mounting hole so that the connecting rod is rotatably connected to the cross head. The pin shaft is provided with a second oil hole, which connects the two first oil holes located at both ends of the second mounting hole. 2. The connecting rod crosshead assembly according to claim 1, characterized in that an annular first oil groove is also provided on the outer peripheral side of the pin shaft, and the first oil groove is connected to the first oil hole and the second oil hole. 3. The connecting rod crosshead assembly according to claim 1 is characterized in that a bushing is arranged in the first mounting hole, the end of the pin shaft is rotatably connected to the crosshead through the bushing, and the pin shaft is also provided with a third oil hole, one end of the third oil hole is connected to the second oil hole and the other end faces the bushing. 4. The connecting rod crosshead assembly according to claim 1 is characterized in that a bushing is provided in the second mounting hole, the pin shaft is rotatably connected to the connecting rod through the bushing, the bushing is provided with an oil hole connected to the first oil hole and the second oil hole, and an annular second oil groove is also provided on the inner side of the bushing. 5. The connecting rod crosshead assembly according to claim 1, characterized in that an elastic retaining ring is also provided at the end of the pin shaft. 6. The connecting rod crosshead assembly according to claim 1, characterized in that a matching arc-shaped bearing shell is provided in the arc-shaped groove, and one end of the connecting rod facing the arc-shaped groove is matched with the bearing shell. 7. The connecting rod crosshead assembly according to claim 6 is characterized in that a third oil groove is further provided on the inner side of the bearing shell, the third oil groove extends along the circumferential direction of the bearing shell, and the third oil groove is connected with the first oil hole. 8. The connecting rod crosshead assembly according to claim 1 is characterized in that a guide plate is connected to the outer surface of the crosshead, a first clamping portion is provided on the side of the guide plate facing the crosshead, and a second clamping portion adapted to the first clamping portion is provided on the outer surface of the crosshead, one of the first clamping portion and the second clamping portion is a groove, and the other is a protrusion. 9. The connecting rod crosshead assembly according to claim 8 is characterized in that the first clamping portion extends along the width direction of the guide plate, and the first clamping portion is provided in plurality and arranged along the length direction of the guide plate, and the second clamping portion extends along the width direction of the crosshead, and the second clamping portion is provided in plurality and arranged along the length direction of the guide plate. 10. A plunger pump, characterized by comprising the connecting rod ten-head assembly according to any one of claims 1 to 9.