Steel sleeve self-tightening device for high pressure plunger pump

Abstract

The present invention provides a steel sleeve self-tightening device for a high-pressure plunger pump, comprising a frame and a punch assembly; a hydraulic cylinder is detachably provided on the top of the frame, and a guide connecting frame is slidably provided inside the frame; the punch assembly and the piston rod in the hydraulic cylinder are fixedly provided on opposite sides of the guide connecting frame respectively; a steel sleeve fixing plate is provided at the bottom of the frame, and a high-pressure steel sleeve is detachably provided on the steel sleeve fixing plate; the self-tightening punch in the punch assembly is movably inserted into the inner hole of the high-pressure steel sleeve. The steel sleeve self-tightening device for a high-pressure plunger pump provided in the present application is specially used for the mechanical self-tightening of a high-pressure plunger pump, and is designed according to the characteristics of the high-pressure steel sleeve. When the inner wall of the high-pressure steel sleeve is subjected to self-tightening treatment, a certain plastic deformation can be generated, and residual stress opposite to the working stress can be generated, thereby reducing the amplitude of the working stress and increasing its service life.

Description

Technical Field

[0001] The invention relates to the field of mechanical technology, in particular to a steel sleeve self-tightening device for a high-pressure plunger pump. Background Art

[0002] The high-pressure plunger pump is a positive displacement pump with a working pressure of generally 10-160MPa. It can achieve the purpose of conveying liquid by means of the periodic change of volume in the high-pressure steel sleeve. During the use of the high-pressure plunger pump, the high-pressure steel sleeve is always under the action of reciprocating high and low pressure stress. Therefore, the strength and service life of the high-pressure steel sleeve are important factors to ensure the quality of the high-pressure plunger pump.

[0003] In order to increase the service life of the high-pressure steel sleeve, it is necessary to perform self-tightening treatment on the inner wall of the high-pressure steel sleeve to produce a certain plastic deformation and generate residual stress. Usually, the hydraulic self-tightening method is used to perform self-tightening treatment on cylindrical parts, such as the self-tightening treatment of the gun barrel. Hydraulic self-tightening has very high requirements for sealing, and the high-pressure steel sleeve is not a closed component, and it is difficult to seal the high-pressure steel sleeve. Therefore, it is difficult for the hydraulic self-tightening method to perform self-tightening treatment on the high-pressure steel sleeve. In addition, the inner hole of the high-pressure steel sleeve is a stepped hole, and not all inner walls are self-tightened. Therefore, it is difficult for hydraulic self-tightening to perform self-tightening treatment on part of the inner wall of the high-pressure steel sleeve. Summary of the invention

[0004] The invention provides a steel sleeve self-tightening device for a high-pressure plunger pump, so as to solve the problem that the existing hydraulic self-tightening method is difficult to perform self-tightening treatment on the high-pressure steel sleeve.

[0005] The present invention provides a steel sleeve self-tightening device for a high-pressure plunger pump, comprising a frame and a punch assembly;

[0006] The top of the frame is detachably provided with a hydraulic cylinder, and the interior of the frame is slidably provided with a guide connecting frame;

[0007] The punch assembly and the piston rod in the hydraulic cylinder are fixedly arranged on opposite sides of the guide connecting frame respectively;

[0008] A steel sleeve fixing plate is provided at the lower part of the frame, and a high-pressure steel sleeve can be detachably provided on the steel sleeve fixing plate;

[0009] The self-tightening punch in the punch assembly is movably inserted into the inner hole of the high-pressure steel sleeve.

[0010] Preferably, the punch assembly comprises a punch fixing plate detachably arranged on the guide connecting frame, a punch connecting piece detachably arranged on the punch fixing plate, and the self-tightening punch;

[0011] The self-tightening punch comprises a punch guide end, a punch connection end and a punch expansion end which are connected in sequence;

[0012] The punch guide end is movably clamped inside the punch fixing plate and the punch connecting piece;

[0013] The punch extrusion end is movably inserted into the inner hole of the high-pressure steel sleeve.

[0014] Preferably, a buffer groove is provided on the punch fixing plate, a through groove is provided on the punch connecting piece, and the punch guide end is movably arranged in the buffer groove and the through groove.

[0015] Preferably, a gap is left between the buffer groove, the through groove and the punch guide end.

[0016] Preferably, the end surface of the punch guide end facing the punch fixing plate is a curved surface.

[0017] Preferably, the end surface of the punch extrusion end facing the steel sleeve fixing plate is a double cone column structure.

[0018] Preferably, the frame comprises a crossbeam frame and four column frames, and the crossbeam frame is arranged on the top of the four column frames;

[0019] The cylinder body in the hydraulic cylinder is fixedly arranged on the crossbeam frame;

[0020] The guide connecting frame is slidably arranged on the four column frames.

[0021] Preferably, a slide groove is provided on the column frame, and a frame guide column is provided on the guide connection frame, and the frame guide column slides in the slide groove.

[0022] Preferably, a support platform is provided at the bottom of the frame, and the steel sleeve fixing plate is detachably provided on the support platform.

[0023] The technical solution provided by the embodiments of the present invention may have the following beneficial effects:

[0024] The present invention provides a steel sleeve self-tightening device for a high-pressure plunger pump, comprising a frame and a punch assembly; a hydraulic cylinder is detachably provided on the top of the frame, and a guide connecting frame is slidably provided inside the frame; the punch assembly and the piston rod in the hydraulic cylinder are fixedly provided on opposite sides of the guide connecting frame respectively; a steel sleeve fixing plate is provided at the lower part of the interior of the frame, and a high-pressure steel sleeve is detachably provided on the steel sleeve fixing plate; the self-tightening punch in the punch assembly is movably inserted into the inner hole of the high-pressure steel sleeve. The steel sleeve self-tightening device for a high-pressure plunger pump provided in the present application is specially used for the mechanical self-tightening of a high-pressure plunger pump, and is designed according to the characteristics of the high-pressure steel sleeve. When the inner wall of the high-pressure steel sleeve is subjected to self-tightening treatment, a certain plastic deformation can be generated, and residual stress opposite to the working stress can be generated, thereby reducing the amplitude of the working stress and increasing its service life.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A three-dimensional structural diagram of a steel sleeve self-tightening device for a high-pressure plunger pump provided in an embodiment of the present invention;

[0028] Figure 2 A cross-sectional view of a steel sleeve self-tightening device for a high-pressure plunger pump provided in an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the structure of a punch assembly provided in an embodiment of the present invention;

[0030] Symbols represent:

[0031] 1-frame, 2-punch assembly, 3-hydraulic cylinder, 4-guide connecting frame, 5-steel sleeve fixing plate, 6-high-pressure steel sleeve, 7-buffer groove, 8-through groove, 9-support platform, 10-ground;

[0032] 101-beam frame, 102-column frame, 103-slideway, 104-frame guide column;

[0033] 201-punch fixing plate, 202-punch connecting piece, 203-self-tightening punch;

[0034] 301-cylinder body, 302-piston rod;

[0035] 2031-punch guide end, 2032-punch connection end, 2033-punch extrusion end. DETAILED DESCRIPTION

[0036] Please refer to the attached Figure 1 , attached Figure 1 The three-dimensional structure diagram of the steel sleeve self-tightening device for the high-pressure plunger pump provided in the embodiment of the present application is shown. Figure 1 It can be seen that the steel sleeve self-tightening device for a high-pressure plunger pump provided in the embodiment of the present application includes a frame 1 and a punch assembly 2. Among them, a hydraulic cylinder 3 is detachably provided on the top of the frame 1, a guide connecting frame 4 is slidably provided inside the frame 1, and a steel sleeve fixing plate 5 is provided at the lower part of the frame 1. The punch assembly 2 and the piston rod 302 in the hydraulic cylinder 3 are fixedly provided on the opposite sides of the guide connecting frame 4, and a high-pressure steel sleeve 6 is detachably provided on the steel sleeve fixing plate 5, and the self-tightening punch 203 in the punch assembly 2 is movably inserted into the inner hole of the high-pressure steel sleeve 6.

[0037] Specifically, the frame 1 is used to set up the punch assembly 2 and the hydraulic cylinder 3. The frame 1 in the embodiment of the present application includes a crossbeam frame 101 and four column frames 102, and the crossbeam frame 101 is arranged on the top of the four column frames 102, so that the frame 1 forms a frame structure. The guide connecting frame 4 is slidably arranged on the four column frames 102, and the guide connecting frame 4 can slide relative to the column frames 102. Further, in order to facilitate the up and down sliding of the guide connecting frame 4 on the column frames 102, the four column frames 102 are provided with a slide groove 103, and the guide connecting frame 4 is provided with a frame guide column 104, and the frame guide column 104 can slide in the slide groove 103, as shown in the attached Figure 2 Furthermore, four column frames 102 are fixed on the ground 10 by bolts.

[0038] A support platform 9 is also provided at the bottom of the frame 1, and a steel sleeve fixing plate 5 is detachably provided on the support platform 9. The high-pressure steel sleeve 6 can be detachably provided through the steel sleeve fixing plate 5, thereby facilitating the fixing of the high-pressure steel sleeve 6. Preferably, the steel sleeve fixing plate 5 and the support platform 9 are detachably connected by bolts.

[0039] The hydraulic cylinder 3 is a component that provides thrust and pull, and includes a cylinder body 301 and a piston rod 302. The cylinder body 301 is provided with an oil inlet and an oil outlet, so that the hydraulic oil can enter and exit the hydraulic cylinder 3 through the oil inlet and the oil outlet, thereby providing thrust and pull. The cylinder body 301 is fixedly set on the crossbeam frame 101, and the end of the piston rod 302 is fixedly set on the guide connecting frame 4. Under the action of the hydraulic oil, the piston rod 302 of the hydraulic cylinder 3 moves up and down relative to the crossbeam frame 101. When the piston rod 302 moves up and down relative to the crossbeam frame 101, since the guide connecting frame 4 is fixedly set on the end of the piston rod 302 and the frame guide column 104, and the frame guide column 104 slides relative to the slide groove 103, the guide connecting frame 4 can slide up and down on the four column frames 102.

[0040] The punch assembly 2 is a component for self-tightening the high-pressure steel sleeve 6. Figure 3 , attached Figure 3 The structure diagram of the punch assembly 2 provided in the embodiment of the present application is shown. Figure 3It can be seen that the punch assembly 2 in the embodiment of the present application includes a punch fixing plate 201, a punch connecting member 202, and a self-tightening punch 203. Specifically, the punch fixing plate 201 is detachably arranged on the guide connecting frame 4 by bolts, etc., the punch connecting member 202 is detachably arranged on the punch fixing plate 201 by bolts, etc., and the self-tightening punch 203 is movably arranged inside the punch connecting member 202. Since the punch fixing plate 201 is arranged on the guide connecting frame 4, and the guide connecting frame 4 slides up and down relative to the four column frames 102, the punch assembly 2 can also slide up and down relative to the frame 1.

[0041] The self-tightening punch 203 in the embodiment of the present application is a double-cone column structure, which includes a punch guide end 2031, a punch connection end 2032 and a punch expansion end 2033 connected in sequence. Among them, the punch guide end 2031 is movably clamped inside the punch fixing plate 201 and the punch connector 202, and is used to achieve the connection between the punch guide end 2031 and the punch fixing plate 201. The punch connection end 2032 is used to connect the punch guide end 2031 and the punch expansion end 2033, and is also used to squeeze the inner hole of the high-pressure steel sleeve 6. In the embodiment of the present application, the diameter of the cylindrical section of the punch expansion end 2033 is larger than the inner hole diameter of the high-pressure steel sleeve 6, so as to facilitate the extrusion of the inner hole of the high-pressure steel sleeve 6. The punch extrusion end 2033 is located at the end of the self-tightening punch 203, and the conical end surface of the punch extrusion end 2033 plays a role of transition and guidance, which can be easily inserted into the inner hole of the high-pressure steel sleeve 6, and then the punch extrusion end 2033 is used to squeeze the inner hole of the high-pressure steel sleeve 6 to achieve self-tightening. Preferably, the punch guide end 2031, the punch connection end 2032 and the punch extrusion end 2033 are integrally formed.

[0042] To facilitate the arrangement of the punch guide end 2031 inside the punch fixing plate 201 and the punch connecting piece 202, a buffer groove 7 is provided on the punch fixing plate 201 in the embodiment of the present application, a through groove 8 is provided on the punch connecting piece 202, and the punch guide end 2031 is movably arranged in the buffer groove 7 and the through groove 8.

[0043] Furthermore, the connection between the self-tightening punch 203 and the punch fixing plate 201 and the punch connecting piece 202 in the embodiment of the present application is set to a floating form, that is, there is a gap between the buffer groove 7, the through groove 8 and the punch guide end 2031. Therefore, the self-tightening punch 203 can move slightly left and right during the process of squeezing the high-pressure steel sleeve 6, and automatically adapt to the fixed position of the high-pressure steel sleeve 6.

[0044] Furthermore, the end surface of the punch guide end 2031 facing the punch fixing plate 201 is an arc surface, and the punch guide end 2031 has a certain degree of freedom. When a slight axial deviation occurs between the high-pressure steel sleeve 6 and the self-tightening punch 203, the arc-surface punch guide end 2031 can automatically adjust the position of the self-tightening punch 203 so that the axis of the high-pressure steel sleeve 6 and the self-tightening punch 203 overlap. In this way, the requirements for the guiding accuracy of the self-tightening punch 203 when entering the high-pressure steel sleeve 6 can be reduced, and the self-tightening punch 203 can be prevented from being stuck in the high-pressure steel sleeve 6 or the punch connection end 2032 being broken, thereby improving flexibility.

[0045] In addition, the length of the cylindrical section of the punch extrusion end 2033 cannot be too long, so as to reduce the friction when the self-tightening punch 203 enters the high-pressure steel sleeve 6, thereby avoiding the need for a large driving force and reducing the energy loss of the hydraulic cylinder 3. The end surface of the punch extrusion end 2033 is a double-cone column structure, wherein the end surface facing the steel sleeve fixing plate 5 can make the punch transition into the inner hole of the high-pressure steel sleeve 6, avoiding the high-pressure steel sleeve 6 from instantly bearing too much interference expansion; the end surface facing the punch connection end 2032 can transitionally remove the interference when the inner wall of the high-pressure steel sleeve 6 is extruded and expanded.

[0046] The working process of the steel sleeve self-tightening device for the high-pressure plunger pump provided in the embodiment of the present application is as follows: when the piston rod 302 in the hydraulic cylinder 3 slides downward, the guide connecting frame 4 also moves downward, thereby driving the self-tightening punch 203 to move downward. Since the high-pressure steel sleeve 6 is fixedly arranged on the steel sleeve fixing plate 5, the punch extrusion end 2033 in the self-tightening punch 203 moving downward can be squeezed into the inner hole of the high-pressure steel sleeve 6, and the inner wall of the high-pressure steel sleeve 6 is squeezed through a certain interference, so that the inner wall of the high-pressure steel sleeve 6 is plastically deformed, and residual stress opposite to the working stress is generated. When the punch extrusion end 2033 of the self-tightening punch 203 reaches the position where the inner hole of the high-pressure steel sleeve 6 becomes smaller, the piston rod 302 in the hydraulic cylinder 3 stops moving downward, and changes to move upward in the opposite direction, thereby driving the self-tightening punch 203 to be pulled out of the high-pressure steel sleeve 6, completing a self-tightening process of the high-pressure steel sleeve 6. When the punch expansion end 2033 of the self-tightening punch 203 reaches the position where the inner hole diameter of the high-pressure steel sleeve 6 becomes smaller, residual compressive stress will be generated on the inner wall of the high-pressure steel sleeve 6 to offset the pulsating pressure that the high-pressure steel sleeve 6 is subjected to when working in the high-pressure plunger pump, reduce the working stress amplitude, and increase the fatigue life of the high-pressure steel sleeve 6.

[0047] The steel sleeve self-tightening device for a high-pressure plunger pump provided in the embodiment of the present application is specifically used for the mechanical self-tightening of a high-pressure plunger pump. It is designed based on the characteristics of the high-pressure steel sleeve 6. When the inner wall of the high-pressure steel sleeve 6 is self-tightened, it can produce a certain plastic deformation and generate residual stress opposite to the working stress, thereby reducing the amplitude of the working stress and increasing its service life.

[0048] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure of the invention herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0049] It should be understood that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A steel sleeve self-tightening device for a high-pressure plunger pump, It is characterized in that It comprises a frame (1) and a punch assembly (2); The top of the frame (1) is detachably provided with a hydraulic cylinder (3), and the interior of the frame (1) is slidably provided with a guide connecting frame (4); The punch assembly (2) and the piston rod (302) in the hydraulic cylinder (3) are fixedly arranged on opposite sides of the guide connecting frame (4); A steel sleeve fixing plate (5) is provided at the lower part of the frame (1), and a high-pressure steel sleeve (6) is detachably provided on the steel sleeve fixing plate (5); The self-tightening punch (203) in the punch assembly (2) is movably inserted into the inner hole of the high-pressure steel sleeve (6); The punch assembly (2) comprises a punch fixing plate (201) detachably arranged on the guide connecting frame (4), a punch connecting piece (202) detachably arranged on the punch fixing plate (201), and the self-tightening punch (203); The self-tightening punch (203) comprises a punch guide end (2031), a punch connection end (2032) and a punch expansion end (2033) which are connected in sequence; The punch guide end (2031) is movably clamped inside the punch fixing plate (201) and the punch connecting piece (202); The punch extrusion end (2033) is movably inserted into the inner hole of the high-pressure steel sleeve (6); The punch fixing plate (201) is provided with a buffer groove (7), the punch connecting piece (202) is provided with a through groove (8), and the punch guide end (2031) is movably arranged in the buffer groove (7) and the through groove (8); The end surface of the punch guide end (2031) facing the punch fixing plate (201) is a curved surface.

2. The steel sleeve self-tightening device for a high-pressure plunger pump according to claim 1, It is characterized in that A gap is left between the buffer groove (7), the through groove (8) and the punch guide end (2031).

3. The steel sleeve self-tightening device for a high-pressure plunger pump according to claim 1, It is characterized in that The end surface of the punch expansion end (2033) facing the steel sleeve fixing plate (5) is a double cone column structure.

4. The steel sleeve self-tightening device for a high-pressure plunger pump according to claim 1, It is characterized in that The frame (1) comprises a crossbeam frame (101) and four column frames (102), wherein the crossbeam frame (101) is arranged on top of the four column frames (102); The cylinder body (301) in the hydraulic cylinder (3) is fixedly arranged on the crossbeam frame (101); The guide connection frame (4) is slidably arranged on the four column frames (102).

5. The steel sleeve self-tightening device for a high-pressure plunger pump according to claim 4, It is characterized in that The upright column frame (102) is provided with a slide groove (103), and the guide connecting frame (4) is provided with a frame guide column (104), and the frame guide column (104) slides in the slide groove (103).

6. The steel sleeve self-tightening device for a high-pressure plunger pump according to any one of claims 1 to 5, It is characterized in that A support platform (9) is provided at the bottom of the frame (1), and the steel sleeve fixing plate (5) is detachably provided on the support platform (9).

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