A plunger pump cylinder processing method and system

Abstract

The present invention relates to the field of welding technology, and in particular, to a plunger pump cylinder processing method and system. Step S10, based on the welding requirements of the plunger pump assembly, the plunger pump assembly is fixed on the base of the positioning assembly; Step S20, based on the positioning and fixing of the plunger pump assembly, the outer peripheral wall of the welding sleeve of the welding assembly abuts against the inner wall of the first through hole of the plunger pump assembly; Step S30, based on the abutment of the outer peripheral wall of the welding sleeve with the inner wall of the first through hole, one end of the cone rod is driven to move into the first through hole and the outer peripheral wall of part of the cone rod abuts against the inner wall of the third through hole; Step S40, based on the abutment of the outer peripheral wall of part of the cone rod with the inner wall of the third through hole, the welding assembly and the plunger pump assembly are subjected to diffusion welding; Step S50, based on the completion of the diffusion welding process of the welding assembly and the plunger pump assembly, an inert gas is introduced into the furnace to cool the plunger pump assembly and the welding assembly. In this way, the problem of unreliable connection between the welding sleeve and the cylinder body is solved.

Description

Technical Field

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

[0002] In recent years, with the advancement of science and technology and the development of industry, the demand for plunger pumps has been increasing. A plunger pump is a hydraulic pump that uses the reciprocating motion of a plunger in the plunger pump cylinder to change the volume of the sealed space, thereby achieving oil suction or oil pressure. It has the characteristics of high precision and stable output flow, and is widely used in industry. However, in the actual use of the plunger pump, a welding sleeve is usually added to the plunger pump cylinder to avoid direct contact between the plunger and the cylinder body and extend the service life of the plunger pump. However, there are high requirements for the sealing between the welding sleeve and the cylinder body.

[0003] The welding sleeve and the cylinder body are usually connected by welding. However, the traditional welding method has weak bonding strength at the weld and insufficient reliability. The welding sleeve is easy to fall off, which will cause a greater safety hazard to the plunger pump and easily damage the plunger pump during use, affecting the service life of the plunger pump. Summary of the invention

[0004] In order to solve the problem of unreliable connection between the welding sleeve and the cylinder body, the present invention provides a plunger pump cylinder body processing method and system.

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

[0006] Step S10, based on the welding requirements of the plunger pump assembly, the plunger pump assembly is fixed on the base of the positioning assembly;

[0007] Step S20, based on the positioning and fixing of the plunger pump assembly, the outer peripheral wall of the welding sleeve of the welding assembly abuts against the inner wall of the first through hole of the plunger pump assembly; wherein the welding assembly includes the welding sleeve and the third through hole; the third through hole penetrates from one end of the welding sleeve to the other end; the plunger pump assembly includes a cylinder body and the first through hole; the first through hole penetrates from one end of the cylinder body to the other end; when the outer peripheral wall of the welding sleeve abuts against the inner wall of the first through hole, the first through hole is connected with the third through hole;

[0008] Step S30, based on the outer peripheral wall of the welding sleeve abutting against the inner wall of the first through hole, driving one end of the cone rod to move into the first through hole and causing the outer peripheral wall of a part of the cone rod to abut against the inner wall of the third through hole; wherein the length of the cone rod is greater than the length of the welding sleeve; both ends of the cone rod are located in the outer space of the third through hole; the material of the cone rod is graphite;

[0009] Step S40, based on one end of the tapered rod moving into the first through hole and a portion of the outer peripheral wall of the tapered rod abutting against the inner wall of the third through hole, performing diffusion welding on the welding assembly and the plunger pump assembly;

[0010] Step S50, based on the completion of diffusion welding of the welding assembly and the plunger pump assembly, an inert gas is introduced into the furnace to cool the plunger pump assembly and the welding assembly.

[0011] In some embodiments, the graphite parameters of the cone rod in step S30 include a thermal expansion coefficient A≤5*10 -6 / ℃, bulk density B≥1.82g / cm 3 , porosity C≤18.5%, compressive strength D≥68MPa, flexural strength E≥33MPa.

[0012] In some embodiments, the cross-sectional area of ​​the third through hole in step S20 gradually decreases from one end thereof away from the base toward the other end.

[0013] In some embodiments, the tapered rod in step S30 is in the shape of a truncated cone, and the cross-sectional area of ​​the tapered rod at one end away from the base gradually decreases toward the other end.

[0014] In some embodiments, the taper of the tapered rod in step S30 is less than or equal to 0.3°.

[0015] In some embodiments, step S40 includes:

[0016] Step S41, based on one end of the cone rod moving into the first through hole and the outer peripheral wall of a portion of the cone rod abutting against the inner wall of the third through hole, extracting the air in the furnace to a vacuum setting threshold; wherein the vacuum setting threshold is a vacuum degree less than or equal to 0.2 Pa;

[0017] Step S42, based on the air in the furnace being extracted to the vacuum setting threshold, heating the temperature of the welding assembly and the plunger pump assembly to a temperature threshold range; wherein the temperature threshold range is greater than or equal to 830° C. and less than or equal to 880° C.;

[0018] Step S43, based on the temperatures of the welding assembly and the plunger pump assembly being heated to a temperature threshold range, controlling the temperatures of the welding assembly and the plunger pump assembly to remain within the temperature threshold range until a first set time; wherein the first set time is greater than or equal to 20 minutes and less than or equal to 50 minutes.

[0019] In some embodiments, step S50 includes:

[0020] Step S51, based on the completion of diffusion welding of the welding assembly and the plunger pump assembly, the inert gas is input into the furnace within a second set time and the pressure in the furnace reaches a pressure threshold range; wherein the second set time is less than or equal to 10s; the pressure threshold range is greater than or equal to 0.16MPa and less than or equal to 0.6MPa;

[0021] Step S52, based on the inert gas being input into the furnace within the second set time and the pressure in the furnace reaching the pressure threshold range, cooling the plunger pump assembly and the welding assembly to a set temperature; wherein the set temperature is less than or equal to 100°C.

[0022] In some embodiments, step S10 includes:

[0023] Step S11, based on the welding requirements of the plunger pump assembly, one end of the welding base plate abuts against the base, and the other end abuts against the end of the cylinder body away from the welding sleeve and blocks an opening of the first through hole; wherein the welding assembly also includes a welding base plate; the positioning assembly includes the base, a pressure plate, a first limiting ring, and a second limiting ring; one side of the pressure plate abuts against the end of the cone rod away from the first through hole; one end of the first limiting ring abuts against the base, and the other end abuts against the cylinder body; one end of the second limiting ring abuts against the base, and the other end abuts against the cylinder body; the first limiting ring and the second limiting ring are spaced apart; the outer peripheral side of the welding base plate abuts against the inner ring side of the first limiting ring; the inner peripheral side of the welding base plate abuts against the outer ring side of the second limiting ring; the material of the pressure plate and the base is the same as that of the cone rod;

[0024] Step S12, based on one end of the welding base plate abutting against the base, the other end abutting against the end of the cylinder body away from the welding sleeve and blocking an opening of the first through hole, the plunger pump assembly is fixed on the base of the positioning assembly.

[0025] In some embodiments, the plunger pump cylinder processing method further includes:

[0026] Step S61, after the plunger pump assembly is cooled by the inert gas, the plunger pump assembly and the welding assembly are tempered;

[0027] Step S62, based on the plunger pump assembly and the welding assembly completing the tempering treatment, the tapered rod is removed.

[0028] In a second aspect, the present invention provides a plunger pump cylinder processing system, the plunger pump cylinder processing system is applied to any plunger pump cylinder processing method in the first aspect of the embodiment, and the plunger pump cylinder processing system includes:

[0029] The positioning assembly comprises a base and a cone rod; the cone rod is made of graphite;

[0030] A plunger pump assembly, the plunger pump assembly comprising a cylinder body and a first through hole; the first through hole penetrates from one end of the cylinder body to the other end;

[0031] A welding assembly, comprising a welding sleeve and a third through hole; the third through hole penetrates from one end of the welding sleeve to the other end; when the outer peripheral wall of the welding sleeve abuts against the inner wall of the first through hole, the first through hole is connected to the third through hole; the length of the cone rod is greater than the length of the welding sleeve; both end portions of the cone rod are located in the external space of the third through hole; one end of the cone rod extends into the first through hole; and part of the outer peripheral wall of the cone rod abuts against the inner wall of the third through hole.

[0032] In some embodiments, the positioning assembly further includes a pressing plate, a first limiting ring, and a second limiting ring; one side of the pressing plate abuts against an end of the cone rod away from the first through hole; the first limiting ring and the second limiting ring are arranged on the base at intervals; the pressing plate and the base are made of the same material as the cone rod;

[0033] The plunger pump assembly further includes a second through hole; the second through hole is spaced apart from the first through hole and is disposed on the cylinder body; the second through hole penetrates from one end of the cylinder body to the other end; the second through hole coincides with the central axis of the cylinder body;

[0034] The welding assembly also includes a welding base plate; the welding base plate is in the shape of a circular flat plate; one end of the welding base plate abuts against the base, and the other end abuts against the end of the cylinder body away from the welding sleeve and blocks an opening of the first through hole; the outer ring side of the welding base plate abuts against the inner side wall of the first limiting ring; the inner ring side of the welding base plate abuts against the outer side wall of the second limiting ring.

[0035] In order to solve the problem of unreliable connection between the welding sleeve and the cylinder body, the present invention has the following advantages:

[0036] Before welding, one end of the cone rod is moved into the first through hole and the outer peripheral wall of part of the cone rod is in contact with the inner wall of the third through hole. The material of the cone rod is graphite. Since the thermal expansion coefficient of graphite is small and the volume does not change much when the temperature changes, the welding sleeve can be controlled to expand inward during welding, so that the outer peripheral wall of the welding sleeve is more tightly connected to the inner wall of the first through hole. At the same time, during the cooling process, the cone rod can also inhibit the welding sleeve from tightening inward, ensuring that the welding sleeve does not exceed the tensile limit of the material, avoiding cracks in the welding sleeve, and thus affecting the normal use of the welding sleeve.

[0037] The welding assembly and the plunger pump assembly are welded by diffusion welding, and the purpose of welding is achieved by the movement and diffusion of atoms on the welding surface under high temperature and vacuum environment. No filling material is required, which makes the weld stronger and more corrosion resistant. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A flow chart of a plunger pump cylinder processing method according to an embodiment is shown;

[0039] Figure 2 A schematic diagram of a plunger pump cylinder machining system according to an embodiment is shown.

[0040] Figure numerals: 01 positioning assembly; 11 pressure plate; 12 cone rod; 13 first limiting ring; 14 second limiting ring; 15 base; 02 plunger pump assembly; 21 cylinder body; 22 first through hole; 23 second through hole; 03 welding assembly; 31 welding sleeve; 32 welding base plate; 33 third through hole. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] In the first aspect, this embodiment discloses a method for processing a plunger pump cylinder 21, such as Figure 1 As shown, the processing method of the piston pump cylinder 21 may include:

[0044] Step S10, based on the welding requirements of the plunger pump assembly 02, the plunger pump assembly 02 is fixed on the base 15 of the positioning assembly 01;

[0045] Step S20, based on the positioning and fixing of the plunger pump assembly 02, the outer peripheral wall of the welding sleeve 31 of the welding assembly 03 abuts against the inner wall of the first through hole 22 of the plunger pump assembly 02; wherein the welding assembly 03 includes the welding sleeve 31 and the third through hole 33; the third through hole 33 penetrates from one end of the welding sleeve 31 to the other end; the plunger pump assembly 02 includes the cylinder body 21 and the first through hole 22; the first through hole 22 penetrates from one end of the cylinder body 21 to the other end; when the outer peripheral wall of the welding sleeve 31 abuts against the inner wall of the first through hole 22, the first through hole 22 is connected with the third through hole 33;

[0046] Step S30, based on the outer peripheral wall of the welding sleeve 31 abutting against the inner wall of the first through hole 22, one end of the tapered rod 12 is driven to move into the first through hole 22 and the outer peripheral wall of a part of the tapered rod 12 abuts against the inner wall of the third through hole 33; wherein the length of the tapered rod 12 is greater than the length of the welding sleeve 31; both ends of the tapered rod 12 are located in the outer space of the third through hole 33; the material of the tapered rod 12 is graphite;

[0047] Step S40, based on one end of the cone rod 12 moving into the first through hole 22 and the outer peripheral wall of a portion of the cone rod 12 abutting against the inner wall of the third through hole 33, diffusion welding is performed on the welding assembly 03 and the plunger pump assembly 02;

[0048] Step S50, based on the completion of diffusion welding of the welding component 03 and the plunger pump component 02, an inert gas is introduced into the furnace to cool the plunger pump component 02 and the welding component 03.

[0049] In this embodiment, with the advancement of science and technology and the development of industry, the demand for plunger pumps is increasing. However, in actual use, plunger pumps have higher requirements for the sealing between the welding sleeve 31 and the cylinder body 21. The welding sleeve 31 and the cylinder body 21 are usually connected by welding. However, the bonding strength of the weld seam in the traditional welding method is weak and the reliability is insufficient. Figure 2 As shown, the plunger pump cylinder 21 processing system may include a plunger pump assembly 02, a positioning assembly 01, and a welding assembly 03. The plunger pump assembly 02 may include a cylinder 21 and a first through hole 22. The first through hole 22 may penetrate from one end of the cylinder 21 to the other end. The welding assembly 03 may include a welding sleeve 31 and a third through hole 33, and the third through hole 33 may penetrate from one end of the welding sleeve 31 to the other end. The positioning assembly 01 may include a tapered rod 12 and a base 15. The tapered rod 12 may fix the relative position of the welding sleeve 31 and the first hole, and the base 15 may fix the relative position of the plunger pump assembly 02 and the positioning assembly 01.

[0050] like Figure 1 As shown, the plunger pump cylinder body 21 processing method may include steps S10 to S50, and each step is described in detail as follows:

[0051] In step S10, before the plunger pump assembly 02 starts to be welded, the plunger pump assembly 02 can be first fixed on the base 15 of the positioning assembly 01, which can limit the lateral movement of the plunger pump assembly 02 and also play a positioning role, avoiding the difficulty of alignment during the subsequent installation of the welding sleeve 31 and the cone rod 12, thereby ensuring the accuracy and stability of the welding.

[0052] In step S20, a first through hole 22 can be provided on the cylinder body 21, and the first through hole 22 can penetrate from one end of the cylinder body 21 to the other end. The design of the first through hole 22 can optimize the structure of the cylinder body 21 assembly, reduce the number and complexity of the connectors, and also facilitate the subsequent inspection and maintenance. After the plunger pump assembly 02 is fixed, the welding sleeve 31 can be placed in the first through hole 22, so that the outer peripheral wall of the welding sleeve 31 of the welding assembly 03 can be abutted against the inner wall of the first through hole 22 of the plunger pump assembly 02, and the relative position of the welding sleeve 31 and the first through hole 22 can be positioned, so as to facilitate the subsequent welding of the outer peripheral wall of the welding sleeve 31 and the inner wall of the first through hole 22 together.

[0053] In step S30, a third through hole 33 may be provided on the welding sleeve 31, and the third through hole 33 may penetrate from one end of the welding sleeve 31 to the other end, so that the plunger may penetrate from one end of the welding sleeve 31 to the other end. The outer peripheral wall of the welding sleeve 31 may abut against the inner peripheral wall of the first through hole 22, so as to facilitate the subsequent fixing of the outer peripheral wall of the welding sleeve 31 with the inner wall of the first through hole 22. At this time, the first through hole 22 may be connected with the third through hole 33. After the outer peripheral wall of the welding sleeve 31 abuts against the inner wall of the first through hole 22, one end of the cone rod 12 may be moved into the first through hole 22 and the outer peripheral wall of part of the cone rod 12 abuts against the inner wall of the third through hole 33. The length of the cone rod 12 may be greater than the length of the welding sleeve 31, and both ends of the cone rod 12 may be located in the outer space of the third through hole 33, so that the third through hole 33 may be penetrated by the cone rod 12, and it is ensured that the cone rod 12 can play a supporting role for the entire third through hole 33. At the same time, the material of the cone rod 12 can be graphite. Since the thermal expansion coefficient of graphite is small and the volume does not change much when the temperature changes, one end of the cone rod 12 can be moved into the first through hole 22 before welding, and the outer peripheral wall of part of the cone rod 12 can be abutted against the inner wall of the third through hole 33, so that the welding sleeve 31 can be controlled to expand inward during welding, so that the outer peripheral wall of the welding sleeve 31 is more tightly connected to the inner wall of the first through hole 22. At the same time, since the volume of the cone rod 12 does not change much with temperature, it is not easy to deform, which reduces the variable factors in the welding process and ensures the accuracy and controllability of the welding process.

[0054] In step S40, when one end of the cone rod 12 moves into the first through hole 22 and the outer peripheral wall of a part of the cone rod 12 abuts against the inner wall of the third through hole 33, the welding assembly 03 and the plunger pump assembly 02 can be subjected to diffusion welding. The welding assembly 03 and the plunger pump assembly 02 are welded by diffusion welding, and the purpose of welding is achieved by the movement and diffusion of atoms on the welding surface under a high temperature vacuum environment. No filling material is required, so that the strength of the weld is higher and the corrosion resistance is stronger.

[0055] In step S50, after the diffusion welding of the welding assembly 03 and the plunger pump assembly 02 is completed, an inert gas can be introduced into the furnace to cool the plunger pump assembly 02 and the welding assembly 03. Since the inert gas has a high heat capacity and thermal conductivity, it can absorb more heat and improve the heat absorption efficiency. At the same time, since the chemical properties of the inert gas are stable and it is not easy to react with other substances, the air in the furnace can be discharged by introducing an inert gas into the furnace to prevent the welding pump assembly and the plunger pump assembly 02 from reacting with oxygen in the air at high temperature and being oxidized.

[0056] In some embodiments, the graphite parameters of the cone rod 12 in step S30 include a thermal expansion coefficient A≤5*10 -6 / ℃, bulk density B≥1.82g / cm 3 , porosity C≤18.5%, compressive strength D≥68MPa, flexural strength E≥33MPa.

[0057] In this embodiment, the graphite parameters of the cone rod 12 in step S30 may include a thermal expansion coefficient A≤5*10 -6 / ℃, bulk density B≥1.82g / cm 3 , porosity C≤18.5%, compressive strength D≥68MPa, flexural strength E≥33MPa. The smaller thermal expansion coefficient makes the volume of graphite change little when the temperature changes, and can prevent the welding sleeve 31 from expanding inward when the temperature rises. At the same time, it can also inhibit the welding sleeve 31 from tightening inward when the temperature drops, ensuring that the welding sleeve 31 will not exceed the tensile limit of the material, avoiding cracks in the welding sleeve 31, and thus affecting the normal use of the welding sleeve 31. The larger volume density makes the graphite have higher strength and can withstand greater pressure. The lower porosity can make the graphite denser and have a higher hardness, so that the graphite can better withstand external pressure and wear. The larger compressive strength makes the graphite more resistant to compression, and the larger flexural strength makes the graphite more resistant to bending, so that the cone rod 12 has better mechanical properties and ensures the normal use of the cone rod 12.

[0058] In some embodiments, the cross-sectional area of ​​the third through hole 33 in step S20 gradually decreases from one end thereof away from the base 15 toward the other end.

[0059] In this embodiment, the cross-sectional area of ​​the third through hole 33 in step S20 can gradually decrease from one end away from the base 15 to the other end. The design of the third through hole 33 being wide at the top and narrow at the bottom can enable the contact surface between the tapered rod 12 and the third through hole 33 to provide an axial load to the welding sleeve 31. By applying pressure to the tapered rod 12, the size of the axial load can be controlled, making the size of the axial force between the tapered rod 12 and the welding sleeve 31 easier to control.

[0060] In some embodiments, the tapered rod 12 in step S30 is in a frustum shape, and the cross-sectional area of ​​the tapered rod 12 at one end away from the base 15 gradually decreases toward the other end.

[0061] In this embodiment, the tapered rod 12 in step S30 can be in a truncated cone shape, and the cross-sectional area of ​​the tapered rod 12 at one end away from the base 15 gradually decreases toward the other end, which can be matched with the design of the welding sleeve 31 being wide at the top and narrow at the bottom, so that the welding sleeve 31 and the tapered rod 12 are more tightly combined.

[0062] In some embodiments, the taper of the tapered rod 12 in step S30 is less than or equal to 0.3°.

[0063] In this embodiment, the taper of the tapered rod 12 in step S30 may be less than or equal to 0.3°, and the taper of the welding sleeve 31 may be the same as the taper of the tapered rod 12, so that the welding sleeve 31 is more tightly combined with the tapered rod 12, and the tapered rod 12 is prevented from expanding inwardly better. The smaller taper allows the welding sleeve 31 to expand evenly during welding, ensures the uniformity of the wall thickness of the welding sleeve 31, and reduces the thermal stress of the welding sleeve 31.

[0064] In some embodiments, step S40 includes:

[0065] Step S41, based on one end of the cone rod 12 moving into the first through hole 22 and the outer peripheral wall of a portion of the cone rod 12 abutting against the inner wall of the third through hole 33, the air in the furnace is extracted to a vacuum setting threshold; wherein the vacuum setting threshold is a vacuum degree less than or equal to 0.2 Pa;

[0066] Step S42, based on the air in the furnace being extracted to a vacuum setting threshold, the temperature of the welding assembly 03 and the plunger pump assembly 02 is heated to a temperature threshold range; wherein the temperature threshold range is greater than or equal to 830° C. and less than or equal to 880° C.;

[0067] Step S43, based on the temperatures of the welding component 03 and the plunger pump component 02 being heated to the temperature threshold range, the temperatures of the welding component 03 and the plunger pump component 02 are controlled to remain within the temperature threshold range until a first set time; wherein the first set time is greater than or equal to 20 minutes and less than or equal to 50 minutes.

[0068] In this embodiment, step S40 of the method for processing the plunger pump cylinder 21 may include steps S41 to S43, and each step is described in detail as follows:

[0069] In step S41, when one end of the cone rod 12 moves into the first through hole 22 and the outer peripheral wall of a part of the cone rod 12 abuts against the inner wall of the third through hole 33, preparations can be made before welding to extract the air in the furnace to prevent the air in the furnace from reacting with the connection assembly and the plunger pump assembly 02 during welding. The air in the furnace can be extracted to a vacuum setting threshold, and the vacuum setting threshold can be a vacuum degree less than or equal to 0.2Pa.

[0070] In step S42, when the air in the furnace is evacuated to the vacuum setting threshold, the temperature of the welding component 03 and the plunger pump component 02 can be heated to the temperature threshold range, so that the atomic movement speed of the welding surface can meet the welding requirements. The temperature threshold range can be greater than or equal to 830°C and less than or equal to 880°C.

[0071] In step S43, after the temperature of the welding component 03 and the plunger pump component 02 is heated to the temperature threshold range, the temperature of the welding component 03 and the plunger pump component 02 can be controlled to remain within the temperature threshold range until the first set time. The atoms on the welding surface of the welding component 03 and the plunger pump component 02 are allowed to fully perform thermal motion to achieve the purpose of welding. Among them, the first set time can be greater than or equal to 20 minutes and less than or equal to 50 minutes. In another embodiment, the surface of the first through hole 22 of the cylinder body 21 can be nickel-plated to prevent the surface of the first through hole 22 from being oxidized.

[0072] In some embodiments, step S50 includes:

[0073] Step S51, based on the completion of diffusion welding process of welding assembly 03 and plunger pump assembly 02, inert gas is input into the furnace within the second set time and the pressure in the furnace reaches the pressure threshold range; wherein the second set time is less than or equal to 10s; the pressure threshold range is greater than or equal to 0.16MPa and less than or equal to 0.6MPa;

[0074] Step S52, based on the inert gas being input into the furnace within the second set time and the pressure in the furnace reaching the pressure threshold range, the plunger pump assembly 02 and the welding assembly 03 are cooled to a set temperature; wherein the set temperature is less than or equal to 100°C.

[0075] In this embodiment, step S50 of the method for processing the plunger pump cylinder 21 may include steps S51 and S52, and each step is described in detail as follows:

[0076] In step S51, when the diffusion welding process of the welding assembly 03 and the plunger pump assembly 02 is completed, an inert gas can be input into the furnace within the second set time and the pressure in the furnace can reach the pressure threshold range, so that the furnace can be filled with inert gas to prevent the welding assembly 03 and the plunger pump assembly 02 from contacting with the air and being oxidized. Among them, the second set time can be less than or equal to 10s; the pressure threshold range can be greater than or equal to 0.16MPa and less than or equal to 0.6MPa; by cooling the plunger pump assembly 02 quickly in a short time, it can be ensured that the plunger pump assembly 02 meets the hardness requirements.

[0077] In step S52, when the inert gas is input into the furnace within the second set time and the pressure in the furnace reaches the pressure threshold range, the plunger pump assembly 02 and the welding assembly 03 can be cooled to the set temperature, and the inert gas absorbs the heat of the plunger pump assembly 02 and the welding assembly 03 to achieve the purpose of cooling the plunger pump assembly 02 and the welding assembly 03. The set temperature can be less than or equal to 100°C.

[0078] In some embodiments, step S10 includes:

[0079] Step S11, based on the welding requirements of the plunger pump assembly 02, one end of the welding bottom plate 32 abuts against the base 15, and the other end abuts against the end of the cylinder body 21 away from the welding sleeve 31 and blocks the opening of one end of the first through hole 22; wherein the welding assembly 03 also includes the welding bottom plate 32; the positioning assembly 01 includes the base 15, the pressing plate 11, the first limiting ring 13, and the second limiting ring 14; one side of the pressing plate 11 abuts against the end of the cone rod 12 away from the first through hole 22 One end of the first limiting ring 13 abuts against the base 15, and the other end abuts against the cylinder 21; one end of the second limiting ring 14 abuts against the base 15, and the other end abuts against the cylinder 21; the first limiting ring 13 and the second limiting ring 14 are arranged at intervals; the outer peripheral side of the welding bottom plate 32 abuts against the inner ring side of the first limiting ring 13; the inner peripheral side of the welding bottom plate 32 abuts against the outer ring side of the second limiting ring 14; the material of the pressing plate 11 and the base 15 is the same as that of the cone rod 12;

[0080] Step S12 , based on one end of the welding base plate 32 abutting against the base 15 , the other end abutting against the end of the cylinder body 21 away from the welding sleeve 31 and blocking one end opening of the first through hole 22 , the plunger pump assembly 02 is fixed on the base 15 of the positioning assembly 01 .

[0081] In this embodiment, step S10 of the method for processing the plunger pump cylinder 21 may include steps S11 to S12, and each step is described in detail as follows:

[0082] Step S11, the welding assembly 03 may also include a welding base plate 32. Before welding begins, one end of the welding base plate 32 may be abutted against the base 15 to fix the relative position of the welding base plate 32 and the base 15, so as to avoid difficulty in alignment when the subsequent welding sleeve 31 and the cone rod 12 are installed, and ensure the accuracy and stability of welding. The other end of the welding base plate 32 may abut against the end of the cylinder body 21 away from the welding sleeve 31 and block the opening of one end of the first through hole 22, so that the end of the first through hole 22 abutting against the welding base plate 32 remains sealed. The welding base plate 32 and the end of the cylinder body 21 away from the welding sleeve 31 may be connected by diffusion welding. The positioning assembly 01 may also include a base 15, a pressing plate 11, a first limiting ring 13, and a second limiting ring 14. One side of the pressing plate 11 may abut against the end of the cone rod 12 away from the first through hole 22, so as to provide pressure to the cone rod 12 during welding, so as to ensure that the cone rod 12 can be in close contact with the welding sleeve 31 and avoid the welding sleeve 31 from expanding inward. One end of the first limiting ring 13 can be in contact with the base 15, and the other end can be in contact with the cylinder body 21. One end of the second limiting ring 14 can be in contact with the base 15, and the other end can be in contact with the cylinder body 21, so that the first limiting ring 13 and the second limiting ring 14 can be arranged between the base 15 and the cylinder body 21. The first limiting ring 13 and the second limiting ring 14 can be arranged at intervals, so that the welding bottom plate 32 can be fixed in the interval between the first limiting ring 13 and the second limiting ring 14, and the position of the welding bottom plate 32 can be further fixed radially. Among them, the outer peripheral side of the welding bottom plate 32 can be in contact with the inner ring side of the first limiting ring 13, and the inner peripheral side of the welding bottom plate 32 can be in contact with the outer ring side of the second limiting ring 14, so that the welding bottom plate 32 can be embedded between the first limiting ring 13 and the second limiting ring 14, and the deformation range of the welding bottom plate 32 during high temperature welding is limited, so as to prevent the deformation of the welding bottom plate 32 from being too large during high temperature welding, thereby affecting the normal use of the welding bottom plate 32. The material of the pressing plate 11 and the base 15 can be the same as that of the tapered rod 12. The pressing plate 11, the base 15 and the tapered rod 12 can be made of graphite to ensure that the pressing plate 11, the base 15 and the tapered rod 12 have good structural strength.

[0083] Step S12, when one end of the welding base plate 32 abuts against the base 15, and the other end abuts against the end of the cylinder body 21 away from the welding sleeve 31 and blocks the opening of one end of the first through hole 22, the plunger pump assembly 02 can be fixed to the base 15 of the welding assembly 03, which can limit the lateral movement of the plunger pump assembly 02 and also play a positioning role, avoiding the difficulty of alignment during the subsequent installation of the welding sleeve 31 and the cone rod 12, thereby ensuring the accuracy and stability of welding.

[0084] In some embodiments, the method for processing the plunger pump cylinder 21 further includes:

[0085] Step S61, cooling the plunger pump assembly 02 with the inert gas is completed, and the plunger pump assembly 02 and the welding assembly 03 are tempered;

[0086] Step S62, based on the plunger pump assembly 02 and the welding assembly 03 completing the tempering treatment, the tapered rod 12 is removed.

[0087] In this embodiment, the processing method of the plunger pump cylinder 21 may further include step S61 and step S62.

[0088] In step S61, after the inert gas cools the plunger pump assembly 02, the plunger pump assembly 02 and the welding assembly 03 may be tempered to eliminate the internal stress of the plunger pump assembly 02 and the welding assembly 03 and optimize the performance of the plunger pump assembly 02 and the welding assembly 03.

[0089] In step S62, when the plunger pump assembly 02 and the welding assembly 03 have completed the tempering treatment, the tapered rod 12 can be removed to prevent the welding sleeve 31 from expanding inward during the tempering treatment, thereby ensuring that the welding sleeve 31 is not easily deformed during the tempering treatment.

[0090] In a second aspect, the present invention provides a plunger pump cylinder 21 processing system, the plunger pump cylinder 21 processing system is applied to any one of the plunger pump cylinder 21 processing methods in the first aspect of the embodiment, and the plunger pump cylinder 21 processing system includes:

[0091] Positioning assembly 01, the positioning assembly 01 comprises a base 15 and a cone rod 12; the material of the cone rod 12 is graphite;

[0092] The plunger pump assembly 02 includes a cylinder body 21 and a first through hole 22; the first through hole 22 penetrates from one end of the cylinder body 21 to the other end;

[0093] Welding assembly 03, welding assembly 03 includes a welding sleeve 31 and a third through hole 33; the third through hole 33 penetrates from one end of the welding sleeve 31 to the other end; when the outer peripheral wall of the welding sleeve 31 abuts against the inner wall of the first through hole 22, the first through hole 22 is connected to the third through hole 33; the length of the tapered rod 12 is greater than the length of the welding sleeve 31; both end portions of the tapered rod 12 are in the external space of the third through hole 33; one end of the tapered rod 12 extends into the first through hole 22; the outer peripheral wall of part of the tapered rod 12 abuts against the inner wall of the third through hole 33.

[0094] In this embodiment, the plunger pump cylinder 21 processing system may include a plunger pump assembly 02, a positioning assembly 01, and a welding assembly 03. The positioning assembly 01 may include a tapered rod 12 and a base 15. The tapered rod 12 may fix the relative position of the welding sleeve 31 and the first hole, and the base 15 may fix the relative position of the plunger pump assembly 02 and the positioning assembly 01. The plunger pump assembly 02 may include a cylinder 21 and a first through hole 22. The material of the cylinder 21 may be structural steel. The first through hole 22 may be provided on the cylinder 21, and the first through hole 22 may penetrate from one end of the cylinder 21 to the other end. The design of the first through hole 22 may optimize the structure of the cylinder 21 assembly, reduce the number and complexity of the connectors, and also facilitate later inspection and maintenance. The welding assembly 03 may include a welding sleeve 31 and a third through hole 33. The third through hole 33 may be provided on the welding sleeve 31, and the third through hole 33 may penetrate from one end of the welding sleeve 31 to the other end, so that the plunger may penetrate from one end of the welding sleeve 31 to the other end. The outer peripheral wall of the welding sleeve 31 can abut against the inner peripheral wall of the first through hole 22, so as to facilitate the subsequent fixing of the outer peripheral wall of the welding sleeve 31 with the inner wall of the first through hole 22. At this time, the first through hole 22 can be connected with the third through hole 33. The length of the cone rod 12 can be greater than the length of the welding sleeve 31, and both ends of the cone rod 12 can be located in the outer space of the third through hole 33, so that the third through hole 33 can be penetrated by the cone rod 12, ensuring that the cone rod 12 can support the entire third through hole 33. At the same time, the material of the cone rod 12 can be graphite. Since the thermal expansion coefficient of graphite is small and the volume does not change much when the temperature changes, one end of the cone rod 12 can be moved into the first through hole 22 before welding, and the outer peripheral wall of part of the cone rod 12 can abut against the inner wall of the third through hole 33, so that the welding sleeve 31 can be controlled to expand inward during welding, so that the outer peripheral wall of the welding sleeve 31 and the inner wall of the first through hole 22 are more tightly connected. At the same time, since the volume of the tapered rod 12 does not change much with temperature and is not easily deformed, variable factors in the welding process are reduced, and the accuracy and controllability of the welding process are ensured.

[0095] In some embodiments, the positioning assembly 01 further includes a pressing plate 11, a first limiting ring 13, and a second limiting ring 14; one side of the pressing plate 11 abuts against an end of the cone rod 12 away from the first through hole 22; the first limiting ring 13 and the second limiting ring 14 are arranged on the base 15 at intervals; the material of the pressing plate 11 and the base 15 is the same as that of the cone rod 12;

[0096] The plunger pump assembly 02 further includes a second through hole 23; the second through hole 23 is spaced apart from the first through hole 22 on the cylinder body 21; the second through hole 23 penetrates from one end of the cylinder body 21 to the other end; the second through hole 23 coincides with the central axis of the cylinder body 21;

[0097] The welding assembly 03 also includes a welding base plate 32; the welding base plate 32 is in the shape of a circular flat plate; one end of the welding base plate 32 abuts against the base 15, and the other end abuts against the end of the cylinder body 21 away from the welding sleeve 31 and blocks an opening of the first through hole 22; the outer ring side of the welding base plate 32 abuts against the inner wall of the first limiting ring 13; the inner ring side of the welding base plate 32 abuts against the outer wall of the second limiting ring 14.

[0098] In this embodiment, the positioning assembly 01 may also include a base 15, a pressure plate 11, a first limiting ring 13, and a second limiting ring 14. One side of the pressure plate 11 may abut against one end of the cone rod 12 away from the first through hole 22, and may provide pressure to the cone rod 12 during welding, so as to ensure that the cone rod 12 can be in close contact with the welding sleeve 31, and prevent the welding sleeve 31 from expanding inward. One end of the first limiting ring 13 may abut against the base 15, and the other end may abut against the cylinder body 21, and one end of the second limiting ring 14 may abut against the base 15, and the other end may abut against the cylinder body 21, so that the first limiting ring 13 and the second limiting ring 14 may be arranged between the base 15 and the cylinder body 21. The first limiting ring 13 and the second limiting ring 14 may be arranged at intervals, so that the welding bottom plate 32 may be fixed in the interval between the first limiting ring 13 and the second limiting ring 14. The position of the welding bottom plate 32 is further fixed. The material of the pressing plate 11 and the base 15 can be the same as that of the cone rod 12. The pressing plate 11, the base 15 and the cone rod 12 can be made of graphite to ensure that the pressing plate 11, the base 15 and the cone rod 12 have good structural strength. The material of the welding sleeve 31 and the welding bottom plate 32 can be tin bronze.

[0099] The plunger pump assembly 02 may further include a second through hole 23, which may be spaced apart from the first through hole 22 on the cylinder body 21, and the second through hole 23 may penetrate from one end of the cylinder body 21 to the other end, so that the positioning shaft may penetrate from one end of the cylinder body 21 assembly to the other end through the second through hole 23, thereby supporting and fixing the cylinder body 21. The second through hole 23 may coincide with the central axis of the cylinder body 21, so that the weight of the cylinder body 21 may be evenly distributed around the second through hole 23.

[0100] The welding assembly 03 may also include a welding base plate 32. Before welding begins, one end of the welding base plate 32 may be abutted against the base 15 to fix the relative position of the welding base plate 32 and the base 15, thereby avoiding difficulty in aligning the subsequent welding sleeve 31 and the cone rod 12 during installation, and ensuring the accuracy and stability of welding. The other end of the welding base plate 32 may abut against the end of the cylinder body 21 away from the welding sleeve 31 and block the opening of one end of the first through hole 22, so that the end of the first through hole 22 abutting against the welding base plate 32 remains sealed. The outer peripheral side of the welding base plate 32 may abut against the inner ring side of the first limiting ring 13, and the inner peripheral side of the welding base plate 32 may abut against the outer ring side of the second limiting ring 14. The welding base plate 32 may be in the shape of a circular flat plate, so that the welding base plate 32 may be embedded between the first limiting ring 13 and the second limiting ring 14, thereby limiting the radial movement of the welding base plate 32 along the limiting ring.

[0101] 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 thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A plunger pump cylinder processing method, characterized in that: The plunger pump cylinder body processing method comprises: Step S10, based on the welding requirements of the plunger pump assembly, the plunger pump assembly is fixed on the base of the positioning assembly; wherein, step S10 includes: Step S11, based on the welding requirements of the plunger pump assembly, one end of the welding base plate abuts against the base, and the other end abuts against the end of the cylinder body away from the welding sleeve and blocks an opening of the first through hole; wherein the welding assembly also includes a welding base plate; the positioning assembly includes the base, a pressure plate, a first limiting ring, and a second limiting ring; one side of the pressure plate abuts against the end of the cone rod away from the first through hole; one end of the first limiting ring abuts against the base, and the other end abuts against the cylinder body; one end of the second limiting ring abuts against the base, and the other end abuts against the cylinder body; the first limiting ring and the second limiting ring are spaced apart; the outer peripheral side of the welding base plate abuts against the inner ring side of the first limiting ring; the inner peripheral side of the welding base plate abuts against the outer ring side of the second limiting ring; the material of the pressure plate and the base is the same as that of the cone rod; Step S12, the plunger pump assembly is fixed on the base of the positioning assembly based on one end of the welding bottom plate abutting against the base, the other end abutting against the end of the cylinder body away from the welding sleeve and blocking the opening of one end of the first through hole; Step S20, based on the positioning and fixing of the plunger pump assembly, the outer peripheral wall of the welding sleeve of the welding assembly abuts against the inner wall of the first through hole of the plunger pump assembly; wherein the welding assembly includes the welding sleeve and the third through hole; the third through hole penetrates from one end of the welding sleeve to the other end; the plunger pump assembly includes a cylinder body and the first through hole; the first through hole penetrates from one end of the cylinder body to the other end; when the outer peripheral wall of the welding sleeve abuts against the inner wall of the first through hole, the first through hole is connected with the third through hole; Step S30, based on the outer peripheral wall of the welding sleeve abutting against the inner wall of the first through hole, driving one end of the cone rod to move into the first through hole and partially abutting against the inner wall of the third through hole; wherein the length of the cone rod is greater than the length of the welding sleeve; both ends of the cone rod are located in the outer space of the third through hole; the material of the cone rod is graphite; the graphite parameters of the cone rod include thermal expansion coefficient A≤5*10 -6 / ℃, bulk density B≥1.82g / cm 3 , porosity C ≤ 18.5%, compressive strength D ≥ 68MPa, flexural strength E ≥ 33Mpa; Step S40, based on one end of the tapered rod moving into the first through hole and a portion of the outer peripheral wall of the tapered rod abutting against the inner wall of the third through hole, performing diffusion welding on the welding assembly and the plunger pump assembly; wherein, step S40 includes: Step S41, based on one end of the cone rod moving into the first through hole and the outer peripheral wall of a portion of the cone rod abutting against the inner wall of the third through hole, extracting the air in the furnace to a vacuum setting threshold; wherein the vacuum setting threshold is a vacuum degree less than or equal to 0.2 Pa; Step S42, based on the air in the furnace being extracted to the vacuum setting threshold, heating the temperature of the welding assembly and the plunger pump assembly to a temperature threshold range; wherein the temperature threshold range is greater than or equal to 830° C. and less than or equal to 880° C.; Step S43, based on the temperatures of the welding assembly and the plunger pump assembly being heated to a temperature threshold range, controlling the temperatures of the welding assembly and the plunger pump assembly to remain within the temperature threshold range for a first set time; wherein the first set time is greater than or equal to 20 minutes and less than or equal to 50 minutes; Step S50, based on the completion of diffusion welding of the welding assembly and the plunger pump assembly, an inert gas is introduced into the furnace to cool the plunger pump assembly and the welding assembly.

2. A plunger pump cylinder processing method according to claim 1, characterized in that: The cross-sectional area of ​​the third through hole in step S20 gradually decreases from one end thereof away from the base toward the other end.

3. A plunger pump cylinder processing method according to claim 2, characterized in that: The tapered rod in step S30 is in the shape of a truncated cone, and the cross-sectional area of ​​the end away from the base gradually decreases toward the other end.

4. A plunger pump cylinder processing method according to claim 1, characterized in that: The taper of the tapered rod in step S30 is less than or equal to 0.3°.

5. A plunger pump cylinder processing method according to claim 1, characterized in that: The step S50 comprises: Step S51, based on the completion of diffusion welding of the welding assembly and the plunger pump assembly, the inert gas is input into the furnace within a second set time and the pressure in the furnace reaches a pressure threshold range; wherein the second set time is less than or equal to 10s; the pressure threshold range is greater than or equal to 0.16MPa and less than or equal to 0.6MPa; Step S52, based on the inert gas being input into the furnace within the second set time and the pressure in the furnace reaching the pressure threshold range, cooling the plunger pump assembly and the welding assembly to a set temperature; wherein the set temperature is less than or equal to 100°C.

6. A plunger pump cylinder processing method according to claim 1, characterized in that: The plunger pump cylinder body processing method also includes: Step S61, after the plunger pump assembly is cooled by the inert gas, the plunger pump assembly and the welding assembly are tempered; Step S62, based on the plunger pump assembly and the welding assembly completing the tempering treatment, the tapered rod is removed.

7. A plunger pump cylinder processing system, characterized in that: The plunger pump cylinder processing system is applied to a plunger pump cylinder processing method according to any one of claims 1 to 6, and the plunger pump cylinder processing system comprises: The positioning assembly comprises a base and a cone rod; the cone rod is made of graphite; A plunger pump assembly, the plunger pump assembly comprising a cylinder body and a first through hole; the first through hole penetrates from one end of the cylinder body to the other end; A welding assembly, comprising a welding sleeve and a third through hole; the third through hole penetrates from one end of the welding sleeve to the other end; when the outer peripheral wall of the welding sleeve abuts against the inner wall of the first through hole, the first through hole is connected to the third through hole; the length of the cone rod is greater than the length of the welding sleeve; both end portions of the cone rod are located in the external space of the third through hole; one end of the cone rod extends into the first through hole; and part of the outer peripheral wall of the cone rod abuts against the inner wall of the third through hole.

8. A plunger pump cylinder processing system according to claim 7, characterized in that: The positioning assembly further comprises a pressing plate, a first limiting ring and a second limiting ring; one side of the pressing plate abuts against an end of the cone rod away from the first through hole; the first limiting ring and the second limiting ring are arranged on the base at intervals; the pressing plate and the base are made of the same material as the cone rod; The plunger pump assembly further includes a second through hole; the second through hole is spaced apart from the first through hole and is disposed on the cylinder body; the second through hole penetrates from one end of the cylinder body to the other end; the second through hole coincides with the central axis of the cylinder body; The welding assembly also includes a welding base plate; the welding base plate is in the shape of a circular flat plate; one end of the welding base plate abuts against the base, and the other end abuts against the end of the cylinder body away from the welding sleeve and blocks an opening of the first through hole; the outer ring side of the welding base plate abuts against the inner side wall of the first limiting ring; the inner ring side of the welding base plate abuts against the outer side wall of the second limiting ring.

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