A plunger pump processing method and system

Abstract

The present invention relates to the technical field of plunger pumps, and in particular, to a plunger pump processing method and system. The plunger pump processing method comprises: step S10, based on the processing requirements of the plunger pump, obtaining the matching data of the piston cylinder assembly and the cylinder sleeve assembly; step S20, based on the matching data, obtaining the processing technology of the plunger pump; wherein the processing technology includes the number of processing times n; step S30, based on the processing technology, the inner circumferential wall of the piston cylinder assembly and the outer circumferential wall of the cylinder sleeve assembly abut, and the extrusion ball of the extrusion assembly extrudes the inner circumferential wall of the second sleeve ring n times. In this way, the problem of improving the processing accuracy of the plunger pump is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, and in particular to a plunger pump processing method and system. Background Art

[0002] The cylinder body and bushing are two key components in the plunger pump. The cylinder body can accommodate the plunger and provide a channel for the reciprocating motion of the plunger; the bushing is installed between the cylinder body and the plunger. The inner surface of the bushing is smooth, which can effectively reduce the friction between the plunger and the cylinder body during the movement of the plunger and extend the service life of the plunger pump. There is usually a locking structure between the cylinder body and the bushing to prevent the plunger pump bushing from coming out under harsh working conditions, ensuring the reliability and service life of the plunger pump. The processing of the cylinder body and bushing of the plunger pump has high bonding strength and dimensional accuracy requirements. Traditional processing methods such as machining and hot extrusion have problems such as low material utilization, unstable processing accuracy, and high cost. Especially in the manufacturing of the locking structure of the cylinder body and the bushing, it is difficult to achieve high-strength and tight bonding, and it is easy to have problems such as oil leakage and increased wear.

[0003] Cold extrusion is a processing method that applies pressure to the workpiece through a die fixed on a press to cause plastic deformation and obtain parts. Cold extrusion technology has been applied to the forming of the locking structure of the cylinder block / bushing, but in actual working conditions, due to the large amount of extrusion deformation, problems such as bushing material failure are prone to occur; and the cylinder block / bushing locking structure is prone to insufficient filling of the locking position during the cold extrusion process, affecting the bonding strength of the structure. With the increasing performance requirements for hydraulic equipment, it is urgent to develop a cold extrusion technology that can ensure bonding strength and dimensional accuracy. Summary of the invention

[0004] In order to solve the problem of improving the machining accuracy of a plunger pump, the present invention provides a plunger pump machining method and system.

[0005] In a first aspect, the present invention provides a plunger pump processing method, the plunger pump processing method comprising:

[0006] Step S10, based on the processing requirements of the plunger pump, obtaining the matching data of the piston cylinder assembly and the cylinder liner assembly; wherein the matching data includes the inner diameter of the first sleeve ring of the cylinder liner assembly before processing and the inner diameter D0 of the second sleeve ring of the cylinder liner assembly before processing;

[0007] Step S20, based on the matching data, obtaining the processing technology of the plunger pump; wherein the processing technology includes a processing number n; wherein n>2;

[0008] Step S30, based on the processing technology, the inner circumferential wall of the piston cylinder assembly abuts against the outer circumferential wall of the cylinder sleeve assembly, and the extrusion ball of the extrusion assembly extrudes the inner circumferential wall of the second sleeve ring n times; wherein, (D1-D0) / (D2-D1)<1, D1 is the diameter of the extrusion ball during the first extrusion, and D2 is the diameter of the extrusion ball during the second extrusion.

[0009] In some embodiments, step S30 includes:

[0010] Step S31, judging whether the number of processing times n is greater than a first set range based on the processing technology and the abutment between the inner circumferential wall of the piston cylinder assembly and the outer circumferential wall of the cylinder sleeve assembly;

[0011] Step S32, based on the fact that the number of processing times n is greater than the first set range, the squeezing ball of the squeezing assembly squeezes the inner peripheral wall of the second ring m times; wherein m=INT(n / 2), m≥3; D j -D j-1 <D j+1 -D j , 1≤j≤m-1, D j is the diameter of the extruded ball during the jth extrusion, D j-1 is the diameter of the extruded ball during the j-1th extrusion, D j+1 is the diameter of the extrusion ball during the j+1th extrusion;

[0012] Step S33, based on the squeezing ball squeezing the inner circumference of the second ring for m times, the squeezing ball squeezes the inner circumference of the second ring for h times; wherein h=nm; D s -D s-1 ≥D s+1 -D s , m+1≤s≤n-1, D s is the diameter of the extrusion ball during the s-th extrusion, D s-1 is the diameter of the extrusion ball during the s-1th extrusion, D s+1 is the diameter of the extrusion ball during the s+1th extrusion.

[0013] In some embodiments, |K1|<|K2|; wherein K1 is the slope of any line segment in the broken line formed by all the changes in the diameter of the squeezed ball in the process of m times of squeezing the ball in the spatial coordinate system, and K2 is the slope of any line segment in the broken line formed by all the changes in the diameter of the squeezed ball in the process of h times of squeezing the ball in the spatial coordinate system.

[0014] In some embodiments, when the squeezing ball in step S33 squeezes the inner circumferential wall of the second ring h times, the diameter of the squeezing ball in at least the last squeezing is greater than or equal to the inner diameter of the first ring.

[0015] In some embodiments, the inner circumferential wall of the piston-cylinder assembly and the outer circumferential wall of the cylinder sleeve assembly abutting against each other in step S30 includes at least the outer circumferential wall of the second collar abutting against the inner circumferential wall of the first mounting hole of the piston-cylinder assembly, and the second collar is spaced apart from the third mounting hole of the piston-cylinder assembly.

[0016] In some embodiments, the squeezing ball in step S30 squeezing the inner circumferential wall of the second collar includes the squeezing ball moving along the central axis of the cylinder sleeve assembly to the fourth mounting hole of the piston cylinder assembly and then returning to an initial position.

[0017] In some embodiments, step S10 includes:

[0018] Step S11, pre-treating the cylinder liner assembly based on the processing requirements of the plunger pump; wherein the pre-treating comprises immersing the cylinder liner assembly in liquid nitrogen and leaving it to stand for a set time;

[0019] Step S12, based on the cylinder liner assembly having completed pretreatment, placing the cylinder liner assembly into an installation position in the piston cylinder assembly; wherein the installation position includes an outer peripheral wall of the cylinder liner assembly abutting against an inner peripheral wall of the piston cylinder assembly, one end of the cylinder liner assembly abutting against one end of the fourth installation hole of the piston cylinder assembly, and the other end of the cylinder liner assembly being flush with an open end of the piston cylinder assembly;

[0020] Step S13, based on the installation position of the cylinder liner assembly in the piston cylinder assembly, obtaining the matching data of the piston cylinder assembly and the cylinder liner assembly; wherein the matching data includes the inner diameter of the first ring of the cylinder liner assembly before processing and the inner diameter D0 of the second ring of the cylinder liner assembly before processing.

[0021] In some embodiments, the plunger pump processing method further includes:

[0022] Step S40, based on the extrusion ball completing the extrusion of the inner circumferential wall of the second sleeve, the inner circumferential wall of the cylinder liner assembly is surface treated; wherein the surface treatment includes turning and boring the inner circumferential wall of the cylinder liner assembly, the coaxiality of the inner circumferential wall of the cylinder liner assembly is not greater than 0.003 mm, and the surface roughness of the inner circumferential wall of the cylinder liner assembly is less than 0.16 μm.

[0023] In a second aspect, the present invention provides a plunger pump processing system, the plunger pump processing system is applied to any one of the plunger pump processing methods described in the first aspect, the plunger pump processing system comprising:

[0024] A piston-cylinder assembly, the piston-cylinder assembly comprising a cylinder body, a first mounting hole, a second mounting hole, a third mounting hole, and a fourth mounting hole; the cylinder body forms an internal chamber with an opening at one end; the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole are sequentially connected and arranged in the internal chamber of the cylinder body; the first mounting hole is arranged at an opening at one end of the cylinder body; the first mounting hole has the same inner diameter as the third mounting hole; the inner diameter of the second mounting hole is larger than the inner diameter of the first mounting hole; the inner diameter of the fourth mounting hole is smaller than the inner diameter of the third mounting hole;

[0025] A cylinder sleeve assembly, the cylinder sleeve assembly comprising a first sleeve, a second sleeve and a third sleeve; the first sleeve, the second sleeve and the third sleeve are fixedly connected in sequence; the inner diameter of the second sleeve before processing is smaller than the inner diameters of the first sleeve and the third sleeve; the outer peripheral wall of the first sleeve abuts against the inner wall of the first mounting hole; the outer peripheral wall of the second sleeve before processing is spaced from the inner wall of the second mounting hole; the outer peripheral wall of the third sleeve abuts against the inner wall of the third mounting hole;

[0026] The extrusion assembly comprises an extrusion ball, a driving part and a positioning seat; the extrusion ball is detachably connected to the driving part; the positioning seat is used to position and fix the cylinder body; during processing, the extrusion ball squeezes the inner circumferential wall of the second sleeve ring.

[0027] In some embodiments, the second ring includes a front connecting ring, a middle ring body, and a rear connecting ring; the front connecting ring, the middle ring body, and the rear connecting ring are fixedly connected in sequence; before processing, the inner diameter of the middle ring body is smaller than the inner diameter of the first ring; before processing, the inner diameter of the front connecting ring gradually decreases from one end of the front connecting ring close to the first ring to the other end; before processing, the inner diameter of the rear connecting ring gradually decreases from one end of the rear connecting ring close to the second ring to the other end; before processing, the minimum inner diameter of the front connecting ring is equal to the inner diameter of the middle ring body; before processing, the minimum inner diameter of the rear connecting ring is equal to the inner diameter of the middle ring body; before processing, the angle between the inner circumferential wall of the front connecting ring and the central axis of the middle ring body is less than or equal to the angle between the inner circumferential wall of the rear connecting ring and the central axis of the middle ring body.

[0028] In order to solve the problem of improving the machining accuracy of the plunger pump, the present invention has the following advantages:

[0029] When the piston cylinder assembly of the plunger pump is connected to the cylinder sleeve assembly, the inner wall of the cylinder sleeve assembly is squeezed to make its outer wall protrude and engage with the groove of the piston cylinder assembly. The extrusion process easily causes the deformation caused by the extrusion to be inconsistently distributed in the circumferential direction of the cylinder sleeve assembly, resulting in uneven connection between the piston cylinder assembly and the cylinder sleeve assembly, and the cylinder sleeve assembly is easy to come out of the piston cylinder assembly. By controlling the deformation of the initial extrusion to be smaller, it is possible to avoid a large deflection caused by the first extrusion, which gradually increases with the increase in the number of processing times, which is conducive to making the deformation of the cylinder sleeve assembly more evenly distributed along its circumference, increasing the connection stability of the piston cylinder assembly and the cylinder sleeve assembly, and improving the connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flow chart of a plunger pump processing method according to an embodiment is shown;

[0031] Figure 2 A schematic diagram of a plunger pump processing system according to an embodiment is shown;

[0032] Figure 3 A partial schematic diagram of a plunger pump processing system according to an embodiment is shown.

[0033] Figure numerals: 01 piston cylinder assembly; 11 cylinder body; 12 first mounting hole; 13 second mounting hole; 14 third mounting hole; 15 fourth mounting hole; 02 cylinder sleeve assembly; 21 first ring; 22 second ring; 221 front connecting ring; 222 middle ring body; 223 rear connecting ring; 23 third ring; 03 extrusion assembly; 31 extrusion ball; 32 driving part; 33 positioning seat. DETAILED DESCRIPTION

[0034] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0035] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0036] In this embodiment, the piston cylinder assembly 01 and the cylinder sleeve assembly 02 of the plunger pump are connected together by cold extrusion, and the inner wall of the cylinder sleeve assembly 02 is extruded to make its outer wall protrude and engage with the groove of the piston cylinder assembly 01. Since there is a large difference between the diameter of the extrusion ball 31 and the inner diameter of the second sleeve 22 of the cylinder sleeve assembly 02, especially during the first extrusion, the center line of the extrusion ball 31 is easily deviated from the center line of the cylinder sleeve assembly 02, resulting in an uneven extrusion process, which in turn affects the processing accuracy and product performance. This causes uneven connection between the piston cylinder assembly 01 and the cylinder sleeve assembly 02, which is prone to stress concentration when subjected to force, and the cylinder sleeve assembly 02 is easy to fall out of the piston cylinder assembly 01. At the same time, during multiple extrusion processes, the material will undergo work hardening, and local stress concentration or microcracks will be more likely to occur. Therefore, a plunger pump processing method is proposed. Figure 2As shown, the plunger pump processing system generally includes a piston pump assembly, a cylinder sleeve assembly 02, and an extrusion assembly 03. The piston cylinder assembly 01 may include a cylinder body 11, a first mounting hole 12, a second mounting hole 13, a third mounting hole 14, and a fourth mounting hole 15. The first mounting hole 12, the second mounting hole 13, the third mounting hole 14, and the fourth mounting hole 15 are sequentially connected and penetrate the cylinder body 11, and the second mounting hole 13 may be a groove portion of the piston cylinder assembly 01. The cylinder sleeve assembly 02 may include a first collar 21, a second collar 22, and a third collar 23. The first collar 21, the second collar 22, and the third collar 23 may be fixedly connected in sequence. The inner diameter of the second collar 22 before processing may be smaller than the inner diameters of the first collar 21 and the third collar 23. The extrusion assembly 03 may generally include an extrusion ball 31, which may include different specifications and sizes, so as to gradually extrude the inner wall of the second sleeve ring 22 of the cylinder sleeve assembly 02, thereby causing the second sleeve ring 22 of the cylinder sleeve assembly 02 to deform in the circumferential direction, thereby causing the cylinder sleeve assembly 02 to engage with the groove on the inner wall of the piston cylinder assembly 01, thereby achieving cold extrusion locking of the piston cylinder assembly 01 and the cylinder sleeve assembly 02. Figure 1 As shown, the plunger pump processing system may include:

[0037] Step S10, based on the processing requirements of the plunger pump, the matching data of the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can be obtained. The matching data of the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can include the inner diameter of the first sleeve ring 21 of the cylinder sleeve assembly 02 before processing and the inner diameter D0 of the second sleeve ring 22 of the cylinder sleeve assembly 02 before processing.

[0038] Step S20, based on the matching data, the processing technology of the plunger pump can be obtained. The processing technology can include the number of processing times n. Where n>2, n is an integer. The squeezing ball 31 can include different specifications and sizes. The squeezing ball 31 of the same size is used to squeeze the inner wall of the second ring 22. One round trip is called one processing.

[0039] Step S30, based on the determined processing technology, the inner circumferential wall of the piston cylinder assembly 01 and the outer circumferential wall of the cylinder sleeve assembly 02 are abutted, and the extrusion balls 31 of different specifications are driven to extrude the inner circumferential wall of the second sleeve 22 for n times. Among them, (D1-D0) / (D2-D1)<1, D1 is the diameter of the extrusion ball 31 during the first extrusion, and D2 is the diameter of the extrusion ball 31 during the second extrusion. In the process of the extrusion ball 31 extruding the inner wall of the second sleeve 22, it is necessary to keep the center of the extrusion ball 31 always on the axis of the cylinder sleeve assembly 02. In the actual processing process, affected by the working conditions, uneven material of the parts, etc., the extrusion ball 31 extruding the inner wall of the second sleeve 22 is likely to cause the axis of the inner wall of the second sleeve 22 to deflect before and after the extrusion. By controlling the extrusion amount, that is, the deformation amount caused by the initial extrusion is small, it is possible to avoid excessive deflection caused by the first extrusion. In the forming process, the initial extrusion amount is set to a small value, mainly to reduce the axis deflection between the extrusion ball 31 and the inner wall of the second sleeve 22. This deflection is usually caused by the large difference between the diameter of the extrusion ball 31 and the inner diameter of the second ring 22. By reducing the deformation of the initial extrusion, the radial force of the extrusion ball 31 on the inner wall of the second ring 22 can be reduced, the tendency of deflection can be reduced, and the central axis of the extrusion ball 31 can be ensured to be consistent with the central axis of the cylinder sleeve assembly 02. At the same time, the smaller initial extrusion deformation ensures a smaller radial deformation of the second ring 22, which helps to maintain the geometric integrity of the forming part. Gradually adjusting the radial extrusion amount can ensure precise alignment during subsequent forming, laying the foundation for subsequent uniform deformation. This is conducive to making the deformation of the second ring 22 more evenly distributed along its circumference, increasing the connection stability between the piston cylinder assembly 01 and the cylinder sleeve assembly 02, and improving the connection strength.

[0040] In other embodiments, during one processing, the extrusion ball 31 of the same size can be used to extrude the inner wall of the second sleeve back and forth multiple times to weaken the rebound of the inner wall of the second sleeve and make the deformation of the inner wall of the second sleeve more evenly distributed along the circumferential direction.

[0041] In this embodiment, step S30 may include:

[0042] Step S31, based on the processing technology, the inner circumferential wall of the piston cylinder assembly 01 and the outer circumferential wall of the cylinder sleeve assembly 02 abutting, it can be determined whether the processing times n is greater than the first set range. The value of the first set range can be flexibly selected according to the actual situation, for example, the value of the first set range can be 5 to 7. By setting the processing times n to be greater than the first set range, it is ensured that the squeezing ball 31 squeezes the inner wall of the cylinder sleeve assembly 02 for multiple times, so that the deformation caused by the squeezing can be more evenly distributed along the circumferential direction.

[0043] Step S32: Based on the processing times n being greater than the first set range, the squeezing ball 31 of the squeezing assembly 03 may squeeze the inner circumference of the second ring 22 m times. Wherein, m=INT(n / 2), m≥3, that is, m is half of n and rounded down to an integer. j -D j-1 <D j+1 -D j , 1≤j≤m-1, D j can be the diameter of the squeezing ball 31 during the j-th squeezing, D j-1 can be the diameter of the extruded ball 31 during the j-1th extrusion, D j+1 It can be the diameter of the extrusion ball 31 during the j+1th extrusion.

[0044] Step S33: After the squeezing ball 31 has squeezed the inner wall of the second ring 22 m times, the squeezing ball 31 may squeeze the inner wall of the second ring 22 h times. Wherein, h=nm. s -D s-1 ≥D s+1 -D s , m+1≤s≤n-1, D s can be the diameter of the extrusion ball 31 during the s-th extrusion, D s-1 can be the diameter of the extrusion ball 31 during the s-1th extrusion, D s+1It can be the diameter of the extrusion ball 31 during the s+1th extrusion. By controlling the deformation generated by the first m extrusions during the extrusion process to gradually increase, it is beneficial to reduce the deflection generated by the extrusion, so that the deformation of the second ring 22 caused by the extrusion is evenly distributed along the circumference. Due to the cold work hardening phenomenon of the metal, the extrusion of the inner wall of the second ring 22 by the extrusion ball 31 will cause the plasticity of the inner wall of the second ring 22 to decrease and the hardness to increase. Therefore, in the subsequent h extrusions, the deformation generated by the extrusion is gradually reduced, which is beneficial to avoid damage to the inner wall of the second ring 22, so that the deformation of the second ring 22 is more evenly distributed along the circumference, and the product stability is improved. The cumulative deformation effect in plastic processing shows that after the initial extrusion, the microstructure inside the material gradually accumulates dislocations, and the deformation resistance increases accordingly. Therefore, in the first m extrusion process, after the first extrusion is completed, the increase in the subsequent extrusion amount can gradually compact the material, so that the stress in the second ring 22 is evenly distributed and the overall plastic deformation is formed. By gradually increasing the extrusion amount, it is ensured that the material is uniformly deformed on the inner and outer walls of the second ring 22. At the same time, by increasing the amount of extrusion, the thickness of the deformation layer of the second ring 22 can be gradually expanded to ensure that the material gradually fills the second mounting hole 13, thereby improving the tightness and reliability of the locking structure of the piston cylinder assembly 01 and the second ring 22. The material will gradually undergo work hardening during multiple plastic deformations, that is, as the deformation increases, the hardness and tensile strength of the material increase, and the deformation resistance increases. When the extrusion amount reaches the peak value, the material has shown significant hardening. At this time, continuing to apply a large deformation amount may cause microcracks or excessive deformation of the material, leading to structural failure. Therefore, in the last h extrusion processes, by reducing the extrusion amount, damage to the second ring 22 can be avoided while maintaining the material deformation.

[0045] In this embodiment, |K1|<|K2|. K1 is the slope of any line segment in the broken line formed by the diameter changes of all the extruded balls 31 in the spatial coordinate system during the m-times of extrusion, and K2 is the slope of any line segment in the broken line formed by the diameter changes of all the extruded balls 31 in the spatial coordinate system during the h-times of extrusion. The diameter change of the extruded ball 31 can characterize the extrusion deformation. The extrusion deformation gradually increases during the first m extrusions, and the extrusion deformation gradually decreases during the next h extrusions. By controlling the slope of any segment of the deformation broken line of the first m extrusions to be smaller than the slope of any segment of the deformation broken line of the next h extrusions, the extrusion deflection at the beginning of the extrusion can be reduced, so that the deformation of the second sleeve is more evenly distributed along its circumference, the connection stability between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 is increased, and the connection strength between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 is improved.

[0046] In this embodiment, when the squeezing ball 31 in step S33 squeezes the inner circumferential wall of the second sleeve 22 h times, the diameter of the squeezing ball 31 at least in the last squeezing can be greater than or equal to the inner diameter of the first sleeve 21. By making a small amount of interference fit between the squeezing ball 31 and the cylinder sleeve assembly 02, a tighter combination between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can be achieved, and the bonding strength between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can be increased. In addition, the squeezing ball 31 of the squeezing assembly 03 having a larger diameter than the inner diameter of the cylinder sleeve assembly 02 can also effectively control the deformation and wall thickness distribution during the squeezing process, avoiding the phenomenon of local stress concentration and uneven deformation.

[0047] In this embodiment, the inner circumferential wall of the piston cylinder assembly 01 and the outer circumferential wall of the cylinder sleeve assembly 02 in step S30 may include at least the outer circumferential wall of the second collar 22 abutting against the inner circumferential wall of the first mounting hole 12 of the piston cylinder assembly 01, and the second collar 22 and the third mounting hole 14 of the piston cylinder assembly 01 may be spaced apart. During the extrusion process, the extrusion ball 31 exerts a component force on the second collar 22 in the direction of the third mounting hole 14, driving the second collar 22 to generate a displacement in the direction close to the third mounting hole 14. Therefore, by controlling the second ring 22 to be staggered with the second mounting hole 13, the second ring 22 is slightly close to one side of the first mounting hole 12, so that the position of the second ring 22 after being squeezed is matched with the position of the second mounting hole 13, and the two ends of the axial direction of the protruding part of the second ring 22 after being squeezed coincide with the two ends of the axial direction of the second mounting hole 13 respectively, so that the second mounting hole 13 is filled with the protruding part produced by the deformation of the second ring 22, which can effectively avoid the shaking of the cylinder sleeve assembly 02 along the axial direction of the piston cylinder assembly 01, and make the connection between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 more stable.

[0048] In this embodiment, the squeezing ball 31 in step S30 squeezes the inner circumferential wall of the second sleeve 22 once, which may include moving the squeezing ball 31 along the central axis of the cylinder sleeve assembly 02 to the fourth mounting hole 15 of the piston cylinder assembly 01 and then returning to the initial position. In the process of controlling the squeezing ball 31 to return to the initial position along the central axis of the cylinder sleeve assembly 02, the squeezing ball 31 may squeeze the inner wall of the cylinder sleeve assembly 02 for a second time, which may weaken the rebound tendency of the deformation amount of the inner circumferential wall of the cylinder sleeve assembly 02 after squeezing. Control the squeezing ball 31 to produce a strain smaller than the allowable strain in a single squeezing of the inner circumferential wall of the second sleeve 22, thereby avoiding damage to the inner circumferential wall of the second sleeve 22 or uneven deformation.

[0049] In this embodiment, step S10 includes:

[0050] Step S11, based on the processing requirements of the plunger pump, the cylinder liner assembly 02 may be pre-processed, wherein the pre-processing may include immersing the cylinder liner assembly 02 in liquid nitrogen and leaving it to stand for a set time, so that the cylinder liner assembly 02 is reduced in size due to the low temperature.

[0051] Step S12, based on the pretreatment of the cylinder sleeve assembly 02, the cylinder sleeve assembly 02 can be placed in the installation position in the piston cylinder assembly 01. When the temperature of the cylinder sleeve assembly 02 is restored, the initial interference fit can be completed between the piston cylinder assembly 01 and the cylinder sleeve assembly 02. Among them, the installation position can include the outer peripheral wall of the cylinder sleeve assembly 02 abutting against the inner peripheral wall of the piston cylinder assembly 01, one end of the cylinder sleeve assembly 02 can abut against one end of the fourth mounting hole 15 of the piston cylinder assembly 01, and the other end of the cylinder sleeve assembly 02 can be flush with the open end of the piston cylinder assembly 01. One end of the cylinder sleeve assembly 02 can abut against one end of the fourth mounting hole 15 of the piston cylinder assembly 01, and the inner diameter of the fourth mounting hole 15 can be smaller than the third mounting hole 14, so that a stepped step is formed at the critical point of the third mounting hole 14 and the fourth mounting hole 15, and one end of the cylinder sleeve assembly 02 abuts against the stepped step, and the stepped step can limit the stroke of the cylinder sleeve assembly 02 moving along the axial direction of the piston cylinder assembly 01.

[0052] Step S13, based on the installation position of the cylinder sleeve assembly 02 in the piston cylinder assembly 01, the matching data of the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can be obtained. The matching data may include the inner diameter of the first sleeve ring 21 of the cylinder sleeve assembly 02 before processing and the inner diameter D0 of the second sleeve ring 22 of the cylinder sleeve assembly 02 before processing. By adopting the interference fit cold assembly process, the interference fit between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can be achieved, and the connection between the piston cylinder assembly 01 and the cylinder sleeve assembly 02 can be preliminarily achieved.

[0053] In this embodiment, the plunger pump processing method may further include:

[0054] Step S40, based on the squeezing ball 31, the inner circumferential wall of the second sleeve 22 is squeezed, and the inner circumferential wall of the cylinder sleeve assembly 02 can be subjected to a surface treatment process. The surface treatment process includes turning and boring the inner circumferential wall of the cylinder sleeve assembly 02, so that the coaxiality of the inner circumferential wall of the cylinder sleeve assembly 02 after processing is not greater than 0.003mm, and the surface roughness of the inner circumferential wall of the cylinder sleeve assembly 02 is less than 0.16μm. By performing surface treatment on the inner circumferential wall of the cylinder sleeve assembly 02, the inner circumferential wall of the cylinder sleeve assembly 02 can be made smoother and more precise, which is convenient for reducing the friction between the piston and the cylinder sleeve assembly 02, and improving the performance and quality of the plunger pump.

[0055] In this embodiment, a plunger pump processing system is provided, and the plunger pump processing system is applied to a plunger pump processing method in any of the above embodiments. Figure 2 As shown, the plunger pump processing system may include a piston pump assembly, a cylinder sleeve assembly 02 , and an extrusion assembly 03 .

[0056] The piston cylinder assembly 01 may include a cylinder body 11, a first mounting hole 12, a second mounting hole 13, a third mounting hole 14, and a fourth mounting hole 15. A chamber with an opening at one end may be formed inside the cylinder body 11, which may be used to accommodate the cylinder sleeve assembly 02. The first mounting hole 12, the second mounting hole 13, the third mounting hole 14, and the fourth mounting hole 15 are sequentially connected and arranged in the internal chamber of the cylinder body 11. The first mounting hole 12 may be arranged at an opening at one end of the cylinder body 11. The inner diameters of the first mounting hole 12 and the third mounting hole 14 are the same. The inner diameter of the second mounting hole 13 may be larger than the inner diameter of the first mounting hole 12. The second mounting hole 13 may be used to cooperate with the protrusion of the cylinder sleeve assembly 02 to achieve the engagement between the piston cylinder assembly 01 and the cylinder sleeve assembly 02. The inner diameter of the fourth mounting hole 15 is smaller than the inner diameter of the third mounting hole 14, and the fourth mounting hole 15 may be used to limit the displacement of the cylinder sleeve assembly 02 along the axial direction of the piston cylinder assembly 01.

[0057] The cylinder sleeve assembly 02 may include a first collar 21, a second collar 22, and a third collar 23. The first collar 21, the second collar 22, and the third collar 23 may be fixedly connected in sequence. The inner diameter of the second collar 22 before processing may be smaller than the inner diameters of the first collar 21 and the third collar 23. The outer peripheral wall of the first collar 21 may abut against the inner wall of the first mounting hole 12. The outer peripheral wall of the second collar 22 before processing may be spaced apart from the inner wall of the second mounting hole 13. When the squeezing ball 31 squeezes the inner peripheral wall of the second collar 22 multiple times, the circumference of the second collar 22 may be deformed and occupy the space formed by the outer peripheral wall of the second collar 22 and the inner wall of the second mounting hole 13. The outer peripheral wall of the third collar 23 may abut against the inner wall of the third mounting hole 14.

[0058] The extrusion assembly 03 may include an extrusion ball 31, a driving part 32, and a positioning seat 33. The extrusion ball 31 may include different specifications and sizes, so as to gradually increase the deformation of the cylinder sleeve assembly 02. The extrusion ball 31 may be detachably connected to the driving part 32, and reciprocate along the axial direction of the piston cylinder under the action of the driving part 32. The positioning seat 33 may be used to position and fix the cylinder body 11 to prevent the cylinder body 11 from shaking during processing. During processing, the extrusion ball 31 may squeeze the inner circumferential wall of the second sleeve ring 22, so that the outer circumferential wall of the second sleeve ring 22 bulges outward and abuts against the inner wall of the second mounting hole 13, thereby realizing the locking of the cylinder sleeve assembly 02 and the piston cylinder assembly 01, and preventing the cylinder sleeve assembly 02 from escaping from the piston cylinder assembly 01.

[0059] In this embodiment, if Figure 3As shown, the second ring 22 may include a front connecting ring 221, a middle ring body 222, and a rear connecting ring 223. The front connecting ring 221, the middle ring body 222, and the rear connecting ring 223 may be fixedly connected in sequence. Before processing, the inner diameter of the middle ring body 222 may be smaller than the inner diameter of the first ring 21. Before processing, the inner diameter of the front connecting ring 221 may gradually decrease from one end of the front connecting ring 221 close to the first ring 21 toward the other end, so as to facilitate guiding the extrusion ball 31 from the first ring 21 into the space surrounded by the inner circumferential wall of the middle ring body 222. Before processing, the inner diameter of the rear connecting ring 223 may gradually decrease from one end of the rear connecting ring 223 close to the second ring 22 toward the other end, so as to facilitate guiding the extrusion ball 31 from the third ring 23 into the space surrounded by the inner circumferential wall of the middle ring body 222. Before processing, the minimum inner diameter of the front connecting ring 221 can be equal to the inner diameter of the middle ring body 222, and the minimum inner diameter of the rear connecting ring 223 can be equal to the inner diameter of the middle ring body 222. The front connecting ring 221 and the rear connecting ring 223 can guide the squeezing ball 31 into the space surrounded by the inner wall of the middle ring body 222, so that the squeezing ball 31 can squeeze the inner wall of the middle ring body 222. Before processing, the angle between the inner circumferential wall of the front connecting ring 221 and the central axis of the middle ring body 222 can be less than or equal to the angle between the inner circumferential wall of the rear connecting ring 223 and the central axis of the middle ring body 222. The squeezing ball 31 is guided by the front connecting ring 221 to contact the middle ring body 222 and squeeze the middle ring body 222. The middle ring body 222 is deformed and bulges away from the axis, and then abuts against the inner wall of the second mounting hole 13 of the piston cylinder assembly 01, so as to achieve the locking of the cylinder sleeve assembly 02 and the piston cylinder assembly 01, and prevent the cylinder sleeve assembly 02 from falling out of the piston cylinder assembly 01 during operation. The angle between the inner circumferential wall of the current connecting ring 221 and the central axis of the middle ring body 222 is relatively large, which may cause the front connecting ring 221 to guide the squeezing ball 31 not smoothly enough, and the guiding effect of the front connecting ring 221 is poor during the squeezing process, and the deformation is uneven, which affects the processing stability. By controlling the angle between the inner circumferential wall of the front connecting ring 221 and the central axis of the middle ring body 222 to be smaller than the angle between the inner circumferential wall of the rear connecting ring 223 and the central axis of the middle ring body 222, the guidance of the front connecting ring 221 can be made smoother, the guiding performance can be improved, and the deformation can be made more uniform; the stress concentration at the front connecting ring 221 can also be reduced, and the material deformation distribution can be improved. The gentle inclination design of the front connecting ring 221 can provide a better guiding effect, avoid sudden changes in local material deformation, make the deformation of the second ring 22 in the circumferential direction more consistent, and improve the processing accuracy and structural strength. When the extrusion pressure is constant, reducing the angle between the inner circumferential wall of the front connecting ring 221 and the central axis of the middle ring body 222 can also increase the radial force of the second ring 22, thereby enhancing the fitting effect of the cylinder sleeve assembly 02 and the piston cylinder assembly 01, and improving the uniformity of the deformation of the middle ring body 222 along the circumferential direction, thereby increasing the connection stability of the piston cylinder assembly 01 and the cylinder sleeve assembly 02 and improving the connection strength.

[0060] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made in form and details without departing from the scope of the present disclosure.

Claims

1. A plunger pump processing method, characterized in that: The plunger pump processing method comprises: Step S10, based on the processing requirements of the plunger pump, obtaining the matching data of the piston cylinder assembly and the cylinder liner assembly; wherein the matching data includes the inner diameter of the first sleeve ring of the cylinder liner assembly before processing and the inner diameter D0 of the second sleeve ring of the cylinder liner assembly before processing; Step S20, based on the matching data, obtaining the processing technology of the plunger pump; wherein the processing technology includes a processing number n; wherein n>2; Step S30, based on the processing technology, the inner circumferential wall of the piston cylinder assembly abuts against the outer circumferential wall of the cylinder sleeve assembly, and the squeezing ball of the squeezing assembly squeezes the inner circumferential wall of the second sleeve ring n times; wherein, (D1-D0) / (D2-D1)<1, D1 is the diameter of the squeezing ball during the first squeezing, and D2 is the diameter of the squeezing ball during the second squeezing; Wherein, the step S30 includes: Step S31, judging whether the number of processing times n is greater than a first set range based on the processing technology and the abutment between the inner circumferential wall of the piston cylinder assembly and the outer circumferential wall of the cylinder sleeve assembly; Step S32, based on the fact that the number of processing times n is greater than the first set range, the squeezing ball of the squeezing assembly squeezes the inner peripheral wall of the second ring m times; wherein m=INT(n / 2), m≥3; D j -D j-1 <D j+1 -D j , 1≤j≤m-1, D j is the diameter of the extruded ball during the jth extrusion, D j-1 is the diameter of the extruded ball during the j-1th extrusion, D j+1 is the diameter of the extruded ball during the j+1th extrusion; Step S33, based on the squeezing ball squeezing the inner circumference of the second ring for m times, the squeezing ball squeezes the inner circumference of the second ring for h times; wherein h=nm; D s -D s-1 ≥D s+1 -D s , m+1≤s≤n-1, D s is the diameter of the extrusion ball during the s-th extrusion, D s-1 is the diameter of the extrusion ball at the s-1th extrusion, D s+1 is the diameter of the extruded ball during the s+1th extrusion; |K1|<|K2|; wherein, K1 is the slope of any line segment in the broken line formed by all the changes in the diameter of the extruded ball during the mth extrusion in the spatial coordinate system, and K2 is the slope of any line segment in the broken line formed by all the changes in the diameter of the extruded ball during the hth extrusion in the spatial coordinate system.

2. A plunger pump processing method according to claim 1, characterized in that: When the squeezing ball in step S33 squeezes the inner circumferential wall of the second ring h times, the diameter of the squeezing ball in at least the last squeezing is greater than or equal to the inner diameter of the first ring.

3. A plunger pump processing method according to claim 1, characterized in that: The inner circumferential wall of the piston-cylinder assembly and the outer circumferential wall of the cylinder sleeve assembly abutting in step S30 includes at least the outer circumferential wall of the second collar abutting the inner circumferential wall of the first mounting hole of the piston-cylinder assembly, and the second collar is spaced apart from the third mounting hole of the piston-cylinder assembly.

4. A plunger pump processing method according to claim 1, characterized in that: The squeezing ball squeezing the inner circumferential wall of the second ring in step S30 includes the squeezing ball moving along the central axis of the cylinder sleeve assembly to the fourth mounting hole of the piston cylinder assembly and then returning to an initial position.

5. A plunger pump processing method according to claim 1, characterized in that: The step S10 comprises: Step S11, pre-treating the cylinder liner assembly based on the processing requirements of the plunger pump; wherein the pre-treating comprises immersing the cylinder liner assembly in liquid nitrogen and leaving it to stand for a set time; Step S12, based on the cylinder liner assembly having completed pretreatment, placing the cylinder liner assembly into an installation position in the piston cylinder assembly; wherein the installation position includes an outer circumferential wall of the cylinder liner assembly abutting against an inner circumferential wall of the piston cylinder assembly, one end of the cylinder liner assembly abutting against one end of the fourth installation hole of the piston cylinder assembly, and the other end of the cylinder liner assembly being flush with an open end of the piston cylinder assembly; Step S13, based on the installation position of the cylinder liner assembly in the piston cylinder assembly, obtaining the matching data of the piston cylinder assembly and the cylinder liner assembly; wherein the matching data includes the inner diameter of the first ring of the cylinder liner assembly before processing and the inner diameter D0 of the second ring of the cylinder liner assembly before processing.

6. A plunger pump processing method according to claim 1, characterized in that: The plunger pump processing method also includes: Step S40, based on the extrusion ball completing the extrusion of the inner circumferential wall of the second sleeve, the inner circumferential wall of the cylinder liner assembly is surface treated; wherein the surface treatment includes turning and boring the inner circumferential wall of the cylinder liner assembly, the coaxiality of the inner circumferential wall of the cylinder liner assembly is not greater than 0.003 mm, and the surface roughness of the inner circumferential wall of the cylinder liner assembly is less than 0.16 μm.

7. A plunger pump processing system, the plunger pump processing system is applied to a plunger pump processing method according to any one of claims 1 to 6, characterized in that: The plunger pump processing system comprises: A piston-cylinder assembly, the piston-cylinder assembly comprising a cylinder body, a first mounting hole, a second mounting hole, a third mounting hole, and a fourth mounting hole; the cylinder body forms an internal chamber with an opening at one end; the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole are sequentially connected and arranged in the internal chamber of the cylinder body; the first mounting hole is arranged at an opening at one end of the cylinder body; the first mounting hole has the same inner diameter as the third mounting hole; the inner diameter of the second mounting hole is larger than the inner diameter of the first mounting hole; the inner diameter of the fourth mounting hole is smaller than the inner diameter of the third mounting hole; A cylinder sleeve assembly, the cylinder sleeve assembly comprising a first sleeve, a second sleeve and a third sleeve; the first sleeve, the second sleeve and the third sleeve are fixedly connected in sequence; the inner diameter of the second sleeve before processing is smaller than the inner diameters of the first sleeve and the third sleeve; the outer peripheral wall of the first sleeve abuts against the inner wall of the first mounting hole; the outer peripheral wall of the second sleeve before processing is spaced from the inner wall of the second mounting hole; the outer peripheral wall of the third sleeve abuts against the inner wall of the third mounting hole; The extrusion assembly comprises an extrusion ball, a driving part and a positioning seat; the extrusion ball is detachably connected to the driving part; the positioning seat is used to position and fix the cylinder body; during processing, the extrusion ball squeezes the inner circumferential wall of the second sleeve ring.

8. A plunger pump processing system according to claim 7, characterized in that: The second ring includes a front connecting ring, a middle ring body, and a rear connecting ring; the front connecting ring, the middle ring body, and the rear connecting ring are fixedly connected in sequence; before processing, the inner diameter of the middle ring body is smaller than the inner diameter of the first ring; before processing, the inner diameter of the front connecting ring gradually decreases from one end of the front connecting ring close to the first ring to the other end; before processing, the inner diameter of the rear connecting ring gradually decreases from one end of the rear connecting ring close to the second ring to the other end; before processing, the minimum inner diameter of the front connecting ring is equal to the inner diameter of the middle ring body; before processing, the minimum inner diameter of the rear connecting ring is equal to the inner diameter of the middle ring body; before processing, the angle between the inner circumferential wall of the front connecting ring and the central axis of the middle ring body is less than or equal to the angle between the inner circumferential wall of the rear connecting ring and the central axis of the middle ring body.

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