A kind of bimetallic cylinder sleeve which can be easily disassembled and assembled and its disassembly and assembly method

Abstract

The present invention provides an easily disassembled bimetallic cylinder liner and a disassembly method thereof, comprising an outer metal cylinder liner and an inner metal cylinder liner, wherein a plurality of mounting grooves are provided on the inner circumferential surface of the outer metal cylinder liner, the plurality of mounting grooves are arranged circumferentially, each mounting groove extends from one end of the outer metal cylinder liner to the other end, and the groove bottom surface of the mounting groove is composed of a curved surface and a flat side surface; a plurality of cam surface limiting protrusions are formed on the outer circumferential surface of the inner metal cylinder liner, the plurality of cam surface limiting protrusions are distributed circumferentially and their positions and shapes correspond one-to-one to the plurality of mounting grooves; the bimetallic cylinder liner of the present invention achieves the advantage of easy disassembly and assembly between the inner metal cylinder liner and the outer metal cylinder liner through fusible materials, and through the structural design of the contact surface between the inner metal cylinder liner and the outer metal cylinder liner, the two can achieve rigid support and achieve the same mechanical properties as the bimetallic cylinder liner with conventional interference fit.

Description

Technical Field

[0001] The invention belongs to the technical field of mud pump parts and components, and in particular relates to an easily disassembled bimetallic cylinder sleeve and a disassembly method thereof. Background Art

[0002] The manufacturing process of the bimetallic cylinder liner in the mud pump cylinder liner is relatively simple and low-cost. During use, it mainly solves the problem of difficulty in replacing the inner cylinder liner. The interference fit of the inner and outer cylinder liners is difficult and easy to damage during assembly. It is also necessary to overcome huge friction during disassembly, especially when the cylinder liner is long, the friction is extremely large. To solve this problem, the patent technology ZL202110896352.X independently developed by the applicant discloses an easily disassembled bimetallic cylinder liner, which consists of an inner and outer metal cylinder liner. The shapes of the two ends of the outer metal cylinder liner and the inner metal cylinder liner are matched to fit together to assemble the two metal cylinder liners together, and a thin cylindrical cavity is formed between the two metal cylinder liners. A fusible material such as an aluminum alloy material with a lower melting point than that of the inner and outer metal cylinder liners is injected into the cavity. During assembly, the inner and outer metal cylinder liners are assembled first, and then the fusible material is injected into the cavity between the two to adhere the inner and outer metal cylinder liners. The assembly of the bimetallic cylinder liner is completed with the help of the friction between the inner cylinder liner and the fusible layer and the friction between the outer cylinder liner and the fusible layer. During disassembly, the fusible material is heated at a relatively low temperature to melt and flow out, so as to relieve the huge friction between the inner and outer metal cylinder liner, and the removal and replacement of the inner metal cylinder liner can be easily completed.

[0003] In this technology, the fusible layer made of fusible material, such as aluminum alloy, is relatively soft, so the thickness of the fusible layer can be used to adaptively creep in a small range to adjust the coaxiality of the inner metal cylinder liner and the piston movement and reduce friction. However, the applicant found that due to the relatively softness and creep characteristics of the fusible layer as the intermediate layer between the inner and outer metal cylinder liners, the fusible layer cannot provide sufficient rigid support to the inner metal cylinder liner under high working pressure, resulting in insufficient sealing between the piston and the inner cylinder liner and easy pressure release. Summary of the invention

[0004] Based on the above-mentioned deficiencies, the present invention has been improved and perfected on the basis of the first-generation product disclosed in Patent ZL202110896352.X, and provides an easily disassembled bimetallic cylinder liner and a disassembly method thereof, which retains the advantage of easy disassembly and assembly between the inner metal cylinder liner and the outer metal cylinder liner through fusible materials, and through the structural design of the contact surface between the inner metal cylinder liner and the outer metal cylinder liner, the two can achieve rigid support and achieve the same mechanical properties as the bimetallic cylinder liner with conventional interference fit.

[0005] The technical solution adopted by the present invention is as follows: an easily detachable bimetallic cylinder sleeve, comprising an outer metal cylinder sleeve and an inner metal cylinder sleeve, characterized in that:

[0006] A plurality of mounting grooves are provided on the inner circumferential surface of the outer metal cylinder sleeve, and the plurality of mounting grooves are arranged in the circumferential direction, and each mounting groove extends from one end of the outer metal cylinder sleeve to the other end, and the groove bottom surface of the mounting groove is composed of a curved surface and a flat side surface, and the curved surface makes the groove depth of the mounting groove smoothly transition from shallow to deep in the width direction, and the flat side surface is connected to the side of the curved surface where the groove depth is the deepest;

[0007] A plurality of cam surface limiting protrusions are formed on the outer peripheral surface of the inner metal cylinder liner, and the plurality of cam surface limiting protrusions are distributed along the circumferential direction and correspond one-to-one to the plurality of mounting grooves, and each cam surface limiting protrusion extends from one end of the inner metal cylinder liner to the other end; the surface shape of the cam surface limiting protrusion is also defined by a cam curved surface and a side wall surface, and the surface shape of the cam surface limiting protrusion is adapted to the shape of the bottom surface of the mounting groove.

[0008] Specifically, the cross-sectional contour line of the curved surface portion of the groove bottom surface of the installation groove on a plane perpendicular to the central axis of the outer metal cylinder sleeve is an involute segment or a curve segment with a curvature gradually increasing from small to large.

[0009] The mounting groove may be a spiral structure or a straight groove structure. When the mounting groove is a spiral structure, the mounting groove is a spiral groove extending from one end of the outer metal cylinder sleeve to the other end, and the cam surface limiting protrusion is a spiral structure extending from one end of the inner metal cylinder sleeve to the other end. When the mounting groove is a straight groove structure, the mounting groove and the cam surface limiting protrusion both extend along the axial direction of the bimetallic cylinder sleeve.

[0010] Furthermore, the mounting grooves are evenly distributed in a circular array on the inner circumferential surface of the outer metal cylinder liner; the cam surface limiting protrusions are evenly distributed in a circular array on the outer circumferential surface of the inner metal cylinder liner; and the side edges of multiple mounting grooves are connected end to end in sequence, and the side edges of multiple cam surface limiting protrusions are also connected end to end in sequence.

[0011] Furthermore, it also includes a first end cover and a second end cover, both of which are annular structures, and the inner diameter of the annular structure is smaller than the outer diameter of the inner metal cylinder sleeve; the first end cover and the second end cover are respectively fixedly mounted on one end surface of the outer metal cylinder sleeve. Sealing gaskets can also be arranged between the first end cover and the two layers of metal cylinder sleeves and between the second end cover and the two layers of metal cylinder sleeves to enhance the sealing performance.

[0012] The present invention also claims protection for the above-mentioned disassembly and assembly method of the easily disassembled bimetallic cylinder sleeve, and the assembly process comprises the following steps:

[0013] (1) The cam surface limiting protrusions of the inner metal cylinder sleeve are aligned with the installation grooves of the outer metal cylinder sleeve one by one, and then the inner metal cylinder sleeve is assembled into the outer metal cylinder sleeve to form a state in which the outer circumferential surface of the inner metal cylinder sleeve and the inner circumferential surface of the outer metal cylinder sleeve are clearance-matched;

[0014] (2) The inner metal cylinder liner and the outer metal cylinder liner are restricted to be relatively fixed in the axial position and relatively rotated in the circumferential position, so that the cam surface of the cam surface limiting protrusion and the groove bottom curved surface of the mounting groove rotate alternately, thereby forming a certain degree of interference fit between the cam surface limiting protrusion of the inner metal cylinder liner and the mounting groove of the outer metal cylinder liner;

[0015] (3) sealing one end of the inner metal cylinder liner and the outer metal cylinder liner, and pouring a molten fusible material into the pouring cavity formed between the inner metal cylinder liner and the outer metal cylinder liner from the other end, wherein the melting point of the fusible material is lower than the melting point of the material of the inner metal cylinder liner and the outer metal cylinder liner;

[0016] (4) After the fusible material is cooled and solidified, a first end cover and a second end cover are respectively installed at both ends of the outer metal cylinder sleeve.

[0017] The disassembly process includes the following steps:

[0018] (1) Remove the end covers installed at both ends of the outer metal cylinder liner;

[0019] (2) heating the combined structure of the outer metal cylinder liner and the inner metal cylinder liner until the fusible material between the two melts and flows out;

[0020] (3) The outer metal cylinder liner and the inner metal cylinder liner are rotated relative to each other to release the interference fit between the cam surface limiting protrusion of the inner metal cylinder liner and the installation groove of the outer metal cylinder liner, and then the inner metal cylinder liner is pulled out.

[0021] In the above-mentioned assembling step and disassembling step, the fusible material is selected to be aluminum or aluminum alloy.

[0022] The advantages of the technical solution of the present invention are:

[0023] 1. The inner metal cylinder liner and the outer metal cylinder liner start with a clearance fit, gradually change to surface contact as they rotate, and then gradually become an interference fit. The interference size of the hard fit can be much smaller than that of the conventional interference fit bimetallic cylinder liner, so it is relatively labor-saving during installation and disassembly.

[0024] 2. Pouring fusible materials such as aluminum alloy into the gap between the inner metal cylinder liner and the outer metal cylinder liner can strengthen the structural stability of both and greatly increase the friction. Therefore, a slight interference fit between the inner metal cylinder liner and the outer metal cylinder liner is sufficient, which will not excessively increase the difficulty of assembly and disassembly.

[0025] 3. After assembly, a partial direct contact support area is formed between the inner metal cylinder liner and the outer metal cylinder liner made of rigid material due to interference fit. With the help of the rigid support of this area, the inner metal cylinder liner can have a stronger pressure-bearing capacity, a wider range of applicable working pressure conditions, and enhance the sealing inside the bimetallic cylinder liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the bimetallic cylinder sleeve that is easily disassembled and assembled according to the present invention;

[0027] Figure 2 It is a schematic diagram of the disassembled state of the bimetallic cylinder sleeve that is easily disassembled and assembled according to the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the outer metal cylinder sleeve of the bimetallic cylinder sleeve that is easily disassembled and assembled according to the present invention;

[0029] Figure 4 It is a schematic diagram of the cross-sectional structure of the outer metal cylinder sleeve of the bimetallic cylinder sleeve that is easily disassembled and assembled according to the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the inner metal cylinder liner of the bimetallic cylinder liner that is easily disassembled and assembled according to the present invention;

[0031] Figure 6 The schematic diagram of the assembly process of the bimetallic cylinder sleeve which is easy to disassemble and assemble according to the present invention is shown in FIG. Figure 1 ;

[0032] Figure 7 The schematic diagram of the assembly process of the bimetallic cylinder sleeve which is easy to disassemble and assemble according to the present invention is shown in FIG. Figure 2 ;

[0033] In the figure: 1. outer metal cylinder liner, 2. first end cover, 3. second end cover, 4. bolts, 5. inner metal cylinder liner, 6. mounting groove, 7. cam surface limit protrusion, 8. injection chamber. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships for simplified description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Figure 1 The figure is a schematic diagram of the overall structure of the bimetallic cylinder liner that is easy to disassemble and assemble according to the present invention. As shown in the figure, the bimetallic cylinder liner of the present invention adopts a conventional double-cylinder liner structure in outline to adapt to the existing corresponding matching devices. The outer metal cylinder liner 1 wraps the inner metal cylinder liner, and the first end cover 2 and the second end cover 3 are respectively arranged at both ends of the outer metal cylinder liner 1. The first end cover 2 and the second end cover 3 respectively block one end to limit the axial movement of the inner metal cylinder liner so as to seal it and install it inside the outer metal cylinder liner 1. For details, see Figure 2 , is a schematic diagram of the disassembled state of the bimetallic cylinder liner that is easily disassembled and assembled according to the present invention. Bolt holes are evenly arranged in a circumferential array on the end faces of both sides of the outer metal cylinder liner 1. The first end cover 2 and the second end cover 3 are both annular structures, and bolt through holes are correspondingly arranged along the circumference of the two. During assembly, the first end cover 2 and the second end cover 3 are respectively fixedly installed on the ends of the outer metal cylinder liner 1 by bolts 4, and the outer diameter of the contour of the inner metal cylinder liner 5 is larger than the inner diameter of the first end cover 2 and the second end cover 3. After the inner metal cylinder liner 5 is assembled into the inner part of the outer metal cylinder liner 1 in a shape-fitting manner, the two ends of the inner metal cylinder liner 5 are respectively limited by the first end cover 2 and the second end cover 3.

[0038] Figure 3 and Figure 4They are respectively a schematic diagram of the outer metal cylinder liner structure of the bimetallic cylinder liner that is easily disassembled and a schematic diagram of the cross-sectional structure of the outer metal cylinder liner of the bimetallic cylinder liner that is easily disassembled and assembled according to the present invention. The main improvement is that a plurality of mounting grooves 6 are provided on the inner circumferential surface of the outer metal cylinder liner 1, and the plurality of mounting grooves 6 are distributed along the circumference, preferably evenly distributed in an array, and the extension direction of each mounting groove 6 tends to be along the axial direction of the outer metal cylinder liner 1. Figure 3 , the cross-sectional contour line of the installation groove 6 on the plane perpendicular to the central axis of the outer metal cylinder sleeve 1 is composed of a curve segment and a straight line segment, the curve segment makes the contour shape of the installation groove 6 a curved surface with a smooth transition from shallow to deep, and the straight line segment defines one side of the installation groove 6 to form a side wall surface. Among them, the curve segment of the cross-sectional contour line of the installation groove 6 can be a segment of involute, or a curve segment with a curvature gradually increasing from small to large, or a contour line of a cam surface. In the illustrated embodiment, the installation groove 6 extends spirally along the inner circumference of the outer metal cylinder sleeve 1, that is, a plurality of installation grooves 6 are uniformly opened on the inner circumference of the outer metal cylinder sleeve 1 in the form of spiral grooves or threads, but the groove depth of each installation groove 6 is cut-in grooved along the circumferential direction of the outer metal cylinder sleeve 1 and gradually deepens from shallow to deep. In addition, the spiral inclination angle of each installation groove 6 makes it appropriate that the fan angle occupied by the installation groove 6 extending in the circumferential direction is less than 90°, for example, between 30° and 60°.

[0039] The inner circumference of the outer metal cylinder sleeve 1 is provided with a mounting groove 6, and correspondingly, the outer circumference of the inner metal cylinder sleeve 5 is processed with a protrusion that matches the shape of the mounting groove 6. Figure 5 It is a schematic diagram of the structure of the inner metal cylinder liner of the easily disassembled bimetallic cylinder liner of the present invention. As shown in the figure, a plurality of cam surface limiting protrusions 7 are distributed on the outer peripheral surface of the inner metal cylinder liner 5, and the contour line of each cam surface limiting protrusion 7 on the cross section perpendicular to the axial direction is also composed of a curved segment and a straight segment. The cam surface defined by the curved segment expands outward in an involute manner in the radial direction, and the straight segment defines a side surface at the expanded end of the cam surface, so that the outer diameter of the inner metal cylinder liner 5 returns to the initial outer diameter after the cam surface expands to the maximum position.

[0040] Combine the following Figure 6 and Figure 7 The disassembly and assembly process of the easily disassembled bimetallic cylinder sleeve of the present invention is described as follows:

[0041] Figure 6 The schematic diagram of the assembly process of the bimetallic cylinder sleeve which is easy to disassemble and assemble according to the present invention is shown in FIG. Figure 1The inner circumferential surface profile size of the outer metal cylinder sleeve 1 is slightly larger than the outer circumferential surface profile gear of the inner metal cylinder sleeve 5, and because the shapes of the mounting groove 6 and the cam surface limiting protrusion 7 match, after the cam surface limiting protrusion 7 of the inner metal cylinder sleeve 5 is matched with the mounting groove 6 of the outer metal cylinder sleeve 1 one by one, the inner metal cylinder sleeve 5 is rotated and inserted into the outer metal cylinder sleeve 1. The surface state of the two after preliminary assembly is as follows Figure 6 As shown, a small gap is left between each mounting groove 6 and the corresponding cam surface limiting protrusion 7 .

[0042] Then use a tool to rotate the inner metal cylinder liner 5. As the depth of the installation groove 6 gradually becomes shallower and the outer diameter of the cam surface limiting protrusion 7 gradually becomes larger, after the inner metal cylinder liner 5 and the outer metal cylinder liner 1 rotate relatively by a small angle, the cam surface limiting protrusion 7 and the installation groove 6 transition from a clearance fit to an interference fit. Obviously, the greater the rotation angle, the larger the size of the interference fit between the inner metal cylinder liner 5 and the outer metal cylinder liner 1, and the more difficult it is to disassemble. Therefore, during assembly, use a tool to support the inner metal cylinder liner 5 and then rotate it to a slight interference fit, see Figure 7 , is a schematic diagram of the assembly process of the easily disassembled bimetallic cylinder sleeve of the present invention Figure 2 The inner metal cylinder liner 5 and the outer metal cylinder liner 1 are separated by Figure 6 The state of relative rotation to Figure 7 In the second state shown, the cam surface limiting protrusion 7 and the mounting groove 6 are interference fit together, and a perfusion cavity 8 is formed between the side wall surface of the cam surface limiting protrusion 7 and the side wall surface of the mounting groove 6, and a fusible material in a molten state, such as an aluminum alloy material, is perfused and filled inside the perfusion cavity 8. After the fusible material is cooled, the interference fit state between the inner metal cylinder liner 5 and the outer metal cylinder liner 1 is fixed, and the fusible material greatly increases the friction between the inner metal cylinder liner 5 and the outer metal cylinder liner 1, that is, the relative rotation between the two is locked by the fusible material filling the gap, and the relative sliding between the two along the axial direction is locked by the interference fit and the friction generated by the fusible material. Finally, the first end cover 2 and the second end cover 3 at both ends are bolted to further limit the sliding of the inner metal cylinder liner 5 to complete the assembly of the bimetallic cylinder liner in the present invention.

[0043] When the inner metal cylinder liner 5 is worn and needs to be removed, the first end cover 2 and the second end cover 3 are removed in turn, and then the fusible material inside the filling cavity 8 is heated and melted. After the fusible material flows out, the inner metal cylinder liner 5 is still rotated in the opposite direction using a tool to rotate it from the interference fit state to the Figure 6 In the state 1 shown, the outer metal cylinder liner 1 is then rotated and pulled out.

[0044] According to the technical solution of the present invention, during installation, the inner metal cylinder sleeve 5 and the outer metal cylinder sleeve 1 start from a clearance fit, gradually change to surface fitting contact, and then gradually have an interference fit, and the interference size of the hard fit is much smaller than that of the conventional interference fit bimetallic cylinder sleeve, so it is relatively labor-saving during installation and removal, and after the fusible material is poured and solidified, the inner metal cylinder sleeve 5 and the outer metal cylinder sleeve 1 are adhered together by the fusible material, and the interference fit greatly improves the friction force, ensuring the stability of the bimetallic cylinder sleeve after assembly of the present invention. With this solution, compared with the first generation product of the applicant mentioned in the background technology, since the inner metal cylinder sleeve 5 and the outer metal cylinder sleeve 1 are directly supported by rigid materials at the interference fit position, the shape of the inner metal cylinder sleeve 5 is more stable, and it can withstand higher working pressure without leakage, for example, it can easily withstand a working pressure of at least more than 2MPa.

[0045] Above Figure 1-5 The embodiment in which the mounting groove 6 and the cam surface limiting protrusion 7 are both spirally matched with each other is shown. Of course, in other embodiments, a straight strip structure extending along a straight line parallel to the central axis of the bimetallic cylinder sleeve can also be adopted, that is, the mounting groove 6 extends axially on the inner wall surface of the outer metal cylinder sleeve 1, and the cam surface limiting protrusion 7 extends axially on the outer wall surface of the inner metal cylinder sleeve 5. The assembly and disassembly process of the two-layer metal cylinder sleeve is basically the same as that in the above embodiment. The difference is that the mounting groove 6 and the cam surface limiting protrusion 7 adopt a straight strip structure. After the two are interference-fitted, the inner metal cylinder sleeve The rigid abutment support portion between the sleeve 5 and the outer metal cylinder sleeve 1 is also constructed as a plurality of strip-shaped areas evenly distributed along the cylindrical surface. When the mounting groove 6 and the cam surface limiting protrusion 7 adopt a spiral structure, each rigid abutment support area between the inner metal cylinder sleeve 5 and the outer metal cylinder sleeve 1 extends spirally along the cylindrical surface to occupy a spiral area of ​​a corresponding fan angle. Multiple spiral areas are distributed on the contact surface between the inner metal cylinder sleeve 5 and the outer metal cylinder sleeve 1. The stress between the two is distributed along the curved surface, the force is more uniform, and the mechanical properties are superior to the stress state of the strip-shaped area.

[0046] Furthermore, rubber or metal gaskets may be provided on the inner sides of the first end cover 2 and the second end cover 3 to enhance the sealing between the first end cover 2 and the two layers of metal cylinder liners and between the second end cover 3 and the two layers of metal cylinder liners.

[0047] Although the specific implementation modes of the present invention are described above in conjunction with the accompanying drawings, this does not limit the scope of protection of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations of equivalent structures or equivalent processes that can be made by those skilled in the art without creative work, or directly or indirectly applied to other related technical fields, are still within the scope of protection of the present invention.

Claims

1. An easily detachable bimetallic cylinder liner, comprising an outer metal cylinder liner and an inner metal cylinder liner, characterized in that: A plurality of mounting grooves are provided on the inner circumferential surface of the outer metal cylinder sleeve, and the plurality of mounting grooves are arranged in the circumferential direction, and each mounting groove extends from one end of the outer metal cylinder sleeve to the other end, and the groove bottom surface of the mounting groove is composed of a curved surface and a flat side surface, and the curved surface makes the groove depth of the mounting groove smoothly transition from shallow to deep in the width direction, and the flat side surface is connected to the side of the curved surface where the groove depth is the deepest; A plurality of cam surface limiting protrusions are formed on the outer circumferential surface of the inner metal cylinder sleeve, the plurality of cam surface limiting protrusions are distributed along the circumferential direction and correspond one-to-one with the plurality of mounting grooves, and each cam surface limiting protrusion extends from one end to the other end of the inner metal cylinder sleeve; the surface shape of the cam surface limiting protrusion is also defined by a cam curved surface and a side wall surface, and the surface shape of the cam surface limiting protrusion is adapted to the shape of the groove bottom surface of the mounting groove; The cross-sectional contour line of the curved surface portion of the groove bottom surface of the installation groove on a plane perpendicular to the central axis of the outer metal cylinder sleeve is an involute or a curve segment with a curvature gradually increasing from small to large; When the inner metal cylinder sleeve and the outer metal cylinder sleeve are assembled, a pouring cavity is formed between the side wall surface of the cam surface limiting protrusion and the flat side surface of the mounting groove, and the pouring cavity is used for pouring fusible material in a molten state.

2. The easily detachable bimetallic cylinder sleeve according to claim 1 is also characterized in that: The mounting groove is a spiral groove extending from one end of the outer metal cylinder sleeve to the other end, and the cam surface limiting protrusion is a spiral structure extending from one end of the inner metal cylinder sleeve to the other end.

3. The easily detachable bimetallic cylinder liner according to claim 1 is further characterized in that: The mounting groove and the cam surface limiting protrusion both extend along the axial direction of the bimetallic cylinder sleeve.

4. The easily detachable bimetallic cylinder sleeve according to claim 2 or 3 is also characterized in that: The mounting grooves are evenly distributed in a circular array on the inner circumferential surface of the outer metal cylinder sleeve; The cam surface limiting protrusions are evenly distributed in a circular array on the outer peripheral surface of the inner metal cylinder sleeve; The side edges of the multiple installation grooves are connected end to end in sequence, and the side edges of the multiple cam surface limiting protrusions are also connected end to end in sequence.

5. The easily detachable bimetallic cylinder sleeve according to claim 2 or 3 is characterized in that: It also includes a first end cover and a second end cover, wherein the first end cover and the second end cover are both circular ring structures, and the inner diameter of the circular ring structure is smaller than the outer diameter of the inner metal cylinder sleeve; The first end cover and the second end cover are respectively fixedly mounted on one end surface of the outer metal cylinder sleeve.

6. The easily detachable bimetallic cylinder liner according to claim 2 or 3 is characterized in that: Sealing gaskets are arranged between the first end cover and the two layers of metal cylinder liners, and between the second end cover and the two layers of metal cylinder liners.

7. According to the disassembly and assembly method of the easily detachable bimetallic cylinder liner according to any one of claims 1 to 6, the assembly process comprises the following steps: (1) The cam surface limiting protrusions of the inner metal cylinder sleeve are aligned with the installation grooves of the outer metal cylinder sleeve one by one, and then the inner metal cylinder sleeve is assembled into the outer metal cylinder sleeve to form a state in which the outer circumferential surface of the inner metal cylinder sleeve and the inner circumferential surface of the outer metal cylinder sleeve are clearance-matched; (2) The inner metal cylinder liner and the outer metal cylinder liner are restricted to be relatively fixed in the axial position and relatively rotated in the circumferential position, so that the cam surface of the cam surface limiting protrusion and the groove bottom curved surface of the mounting groove rotate alternately, thereby forming a certain degree of interference fit between the cam surface limiting protrusion of the inner metal cylinder liner and the mounting groove of the outer metal cylinder liner; (3) sealing one end of the inner metal cylinder liner and the outer metal cylinder liner, and pouring a molten fusible material into the pouring cavity formed between the inner metal cylinder liner and the outer metal cylinder liner from the other end, wherein the melting point of the fusible material is lower than the melting point of the material of the inner metal cylinder liner and the outer metal cylinder liner; (4) After the fusible material cools and solidifies, a first end cover and a second end cover are respectively installed at both ends of the outer metal cylinder liner.

8. The disassembly method according to claim 7, wherein the disassembly process comprises the following steps: (1) Remove the end covers installed at both ends of the outer metal cylinder liner; (2) Heating the combined structure of the outer metal cylinder liner and the inner metal cylinder liner until the fusible material between the two melts and flows out; (3) The outer metal cylinder liner and the inner metal cylinder liner are rotated relative to each other to release the interference fit between the cam surface limiting protrusion of the inner metal cylinder liner and the mounting groove of the outer metal cylinder liner, and then the inner metal cylinder liner is pulled out.

9. The disassembly and assembly method according to claim 7 or 8, wherein the fusible material is aluminum or an aluminum alloy.

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