A bimetallic cylinder sleeve and its pressure-replaceable installation tool

Abstract

The present invention provides a bimetallic cylinder liner and a pressure-replaceable installation tool thereof, which can change the conventional interference-fit bimetallic cylinder liner from a hard-drawn assembly to a dimensionally-matched low-friction assembly, thereby avoiding excessive friction during the assembly process that damages the inner cylinder liner and reduces its performance and life. The bimetallic cylinder liner comprises an outer cylinder liner, an inner cylinder liner, a first end cover and a second end cover. The inner diameter of the outer cylinder liner is smaller than the outer diameter of the inner cylinder liner, so that the outer cylinder liner and the inner cylinder liner form an interference fit when assembled. The first end cover and the second end cover are respectively fixedly mounted at the two ends of the outer cylinder liner, and the first end cover and the second end cover respectively abut against the two ends of the inner cylinder liner; the inner surface of the outer cylinder liner is provided with grooves that are evenly distributed and fluidically connected to each other; the wall surface of the outer cylinder liner is provided with an injection port that penetrates its wall thickness.

Description

Technical Field

[0001] The invention belongs to the technical field of mud pump accessories, and in particular relates to a bimetallic cylinder sleeve and a pressure-replaceable installation tool thereof. Background Art

[0002] Bimetallic cylinder liner is the most widely used hydraulic end fitting of mud pump. The inner and outer cylinder liner are made of two kinds of metals. Generally, the outer cylinder liner is made of high-quality carbon steel and is required to have ultra-high tensile strength, while the inner cylinder liner is made of high-chromium wear-resistant alloy and is required to have ultra-high hardness to withstand the internal mud pressure. The bimetallic cylinder liner works in the form of reciprocating motion of the piston ring in the inner cylinder liner. The inner cylinder liner is subjected to the wear of mud particles, and the outer cylinder liner is subjected to the axial impact force. The main failure forms are the failure of excessive wear of the inner cylinder liner and the failure of the inner cylinder liner due to the axial force.

[0003] Wear of the inner cylinder liner during working use is inevitable and it needs to be replaced normally after a service life of several hundred or thousands of hours. The shedding of the inner cylinder liner is generally overcome by the interference fit between the inner cylinder liner and the outer cylinder liner. The huge friction brought by the interference fit increases the axial force performance. However, the interference fit obviously creates a great obstacle during the assembly and the normal disassembly, replacement and reassembly of the inner cylinder liner due to wear. Summary of the invention

[0004] Based on the above technical status, the present invention provides a bimetallic cylinder liner and a pressure-replaceable installation tool thereof, which can change the conventional interference-fit bimetallic cylinder liner from a hard-drawn assembly to a size-matched low-friction assembly, thereby avoiding excessive friction during the assembly process that damages the inner cylinder liner and reduces its performance and life.

[0005] The technical solution adopted by the present invention is as follows: a bimetallic cylinder liner, comprising an outer cylinder liner, an inner cylinder liner, a first end cover and a second end cover, the inner diameter of the outer cylinder liner is smaller than the outer diameter of the inner cylinder liner, so that the outer cylinder liner and the inner cylinder liner form an interference fit when assembled, the first end cover and the second end cover are respectively fixedly installed on the two ends of the outer cylinder liner by bolts or threads, and the first end cover and the second end cover respectively abut against the two ends of the inner cylinder liner to limit the axial displacement of the inner cylinder liner.

[0006] The inner surface of the outer cylinder liner is provided with evenly distributed grooves, and the grooves are fluidically connected to each other. Preferably, the grooves are grid grooves distributed in a grid shape; an injection port that penetrates the wall thickness of the outer cylinder liner is provided on the wall surface of the outer cylinder liner, and the injection port is connected with the grooves on the inner surface of the outer cylinder liner. When hydraulic oil or fusible material is injected into the interior through the injection port, the hydraulic oil or fusible material can flow along the grooves and be evenly distributed. The injection port is blocked by a threaded plug; in addition, a labyrinth sealing structure is provided on the inner surface of the outer cylinder liner near the two end positions. The labyrinth sealing structure is a conventional sealing structure composed of multiple annular narrow grooves arranged side by side, preferably composed of 5-10 annular narrow grooves.

[0007] Preferably, the depth of the groove on the inner surface of the outer cylinder liner is less than one quarter of the thickness of the outer cylinder liner.

[0008] The bimetallic cylinder liner of the present invention can inject high-pressure hydraulic oil into the groove on the inner surface of the outer cylinder liner through the injection port during installation. With the help of liquid pressure, the inner cylinder liner is subjected to hydraulic pressure and its size is miniaturized, so that the inner cylinder liner, which is originally an interference fit, is pressed into a size that is basically adapted during installation. The assembly process not only greatly reduces the assembly friction, but also avoids excessive wear of the inner cylinder liner due to the huge friction during the assembly process.

[0009] Correspondingly, the present invention also provides an installation tool suitable for the above-mentioned bimetallic cylinder sleeve assembly, the installation tool includes a pre-installation component and an inner cylinder sleeve grabbing tool, wherein the pre-installation component includes a base cylinder and a pre-installation sleeve, the base cylinder is externally connected to a power tool, and the power tool provides external power for assembly and disassembly, the pre-installation sleeve is fixedly sleeved on the outside of the base cylinder, the outer diameter of the pre-installation sleeve is slightly smaller than the outer diameter of the inner cylinder sleeve, and is matched with the inner diameter of the outer cylinder sleeve (the same or slightly smaller), when assembling the inner and outer cylinder sleeves, the pre-installation sleeve is first assembled into the outer cylinder sleeve, so that the groove on the inner surface of the outer cylinder sleeve can be closed and pressure can be applied. One end of the inner cylinder liner grasping tool is fixedly connected to the base cylinder, and the other end thereof forms a grasping unit for firmly grasping the inner cylinder liner so that the inner cylinder liner and the pre-installed sleeve are coaxially adjacent to each other. Preferably, the end of the pre-installed sleeve adjacent to the inner cylinder liner forms a step portion with a reduced outer diameter, and the end of the inner cylinder liner is stuck in the step portion, thereby fixing one end of the inner cylinder liner and one end of the pre-installed sleeve in abutment.

[0010] Furthermore, the inner cylinder liner grasping tool includes a pull rod and one or more grasping units, the grasping unit is composed of two groups of conical steel plates, each group of conical steel plates includes 6-15 plates and are stacked together in the same direction, the cone angles of the two groups of conical steel plates of each grasping unit are opposite, and when multiple grasping units are provided, the pull rod is used to assemble the multiple grasping units in series in sequence. Each conical steel plate is a conical cylinder structure surrounded by steel plates, the inner diameter of the center hole of the conical cylinder structure (i.e., the inner diameter of the small-diameter end) is adapted to the diameter of the pull rod, so as to be mounted on the pull rod, and the conical cylinder structure surrounded by the conical steel plates has a buffer gap in the shape of a narrow slit at the side joint, and the buffer gap can be provided so that the conical steel plate can be closed when subjected to circumferential pressure, so that the outer diameter of the outline of the conical cylinder structure has a reduced deformation amplitude, thereby adapting to the size reduction when the inner cylinder liner is compressed by the peripheral liquid pressure.

[0011] The specific installation of this installation tool is generally divided into the following steps:

[0012] S1: The outer cylinder sleeve is supported and fixed inside the oil tank, and the depth of the hydraulic oil in the oil tank is kept to be greater than that of the outer cylinder sleeve; a circulating steel pipe is arranged outside the oil tank, one end of which is connected to the bottom, and the other end extends into the oil tank from the top and can be fixedly connected to the injection port of the outer cylinder sleeve, and the hydraulic pump is connected in series to the circulating steel pipe;

[0013] S2: The pre-installation sleeve is fixedly mounted on the base barrel, and then the pre-installation sleeve is extended into the outer cylinder sleeve and positioned at the position where the inner cylinder sleeve needs to be installed, and the end of the pre-installation sleeve that is extended first is aligned with the outer end of the outer cylinder sleeve; then the inner cylinder sleeve is firmly grasped with the inner cylinder sleeve by the inner cylinder sleeve grasping tool, so that the inner cylinder sleeve is sleeved on the grasping unit at one end of the inner cylinder sleeve grasping tool; the other end of the inner cylinder sleeve grasping unit is extended into the interior of the base barrel so that the inner cylinder sleeve and the pre-installation sleeve are coaxially pressed against each other, and then the relative position of the inner cylinder sleeve grasping unit and the base barrel is fixed;

[0014] S3: Fixedly connect the power tool to the end flange of the base cylinder;

[0015] S4: Start the hydraulic pump and pump hydraulic oil into the groove between the outer cylinder sleeve and the pre-installed sleeve. Then, pull the base cylinder with a power tool, and the pre-installed sleeve gradually withdraws from the outer cylinder sleeve. After the end of the inner cylinder sleeve overcomes the friction and is pulled into the outer cylinder sleeve, the other parts of the inner cylinder sleeve are subjected to the hydraulic pressure and are compressed to a micro-deformation by the hydraulic pressure, thereby relieving the friction of the interference fit between the inner cylinder sleeve and the outer cylinder sleeve, so that the inner cylinder sleeve gradually replaces the pre-installed sleeve and is pulled into the outer cylinder sleeve to realize the assembly of the inner cylinder sleeve and the outer cylinder sleeve.

[0016] S5: After the inner cylinder liner and the outer cylinder liner are assembled, stop the operation of the hydraulic pump, remove the inner cylinder liner grabbing tool, release the position fixation of the outer cylinder liner, then take out the assembled bimetallic cylinder liner and pour out the internal hydraulic oil from the injection port, seal the injection port with a plug, and finally install the first end cover and the second end cover to complete the entire assembly of the bimetallic cylinder liner.

[0017] Furthermore, in order to strengthen the firm installation of the inner and outer cylinder liners, after pouring out the hydraulic oil through the injection port, molten aluminum or aluminum alloy is injected into the groove between the outer and inner cylinder liners, and the injection port is sealed with a plug after cooling.

[0018] The advantages of the technical solution of the present invention are:

[0019] 1. Through the pressure-replacement installation method, the interference-fit two-layer cylinder liner is improved from the conventional assembly method of hard pulling to overcome the huge friction force to an assembly method with only local friction (close to the end of the pre-installed sleeve) after pressure, which can avoid excessive wear of the inner cylinder liner due to huge friction during the assembly process and extend the service life of the double-layer metal cylinder liner.

[0020] 2. The grooves evenly distributed on the inner surface of the outer cylinder liner can be used to inject hydraulic oil to apply pressure to the inner cylinder liner during assembly, or to inject fusible materials such as aluminum or aluminum alloy with a lower melting point than the double-layer metal cylinder liner material after assembly to enhance the structural stability between the outer cylinder liner and the inner cylinder liner.

[0021] 3. The grabbing unit, which is composed of a conical steel plate with a buffer gap on the side, can firmly grab the inner cylinder liner for assembly by the principle of friction self-locking. It has the ability to shrink inward to adapt to the miniaturization of the inner cylinder liner after being compressed, so as not to be unable to change the interference assembly method due to the internal support of the grabbing tool.

[0022] 4. Compared with the existing thermal assembly method, there is no need to heat the metal material to make it expand, thus avoiding unexpected changes in the internal metallographic structure of the metal material due to heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall outline structure of the bimetallic cylinder liner of the present invention;

[0024] Figure 2 It is a schematic diagram of the split structure of the bimetallic cylinder liner of the present invention;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the bimetallic cylinder liner of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the outer cylinder sleeve of the bimetallic cylinder sleeve of the present invention;

[0027] Figure 5 It is a schematic diagram of the cross-sectional structure of the outer cylinder sleeve of the bimetallic cylinder sleeve of the present invention;

[0028] Figure 6 It is a schematic diagram of the overall structure of the installation tool of the present invention;

[0029] Figure 7 It is a schematic diagram of the disassembled structure of the installation tool of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the pre-installed components of the installation tool of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the inner cylinder sleeve grabbing tool in the installation tool of the present invention;

[0032] Fig.10 It is a cross-sectional schematic diagram of the inner cylinder sleeve grabbing tool in the installation tool of the present invention;

[0033] Fig.11 It is a schematic diagram of the structure of the conical steel plate in the inner cylinder liner grabbing tool of the present invention;

[0034] In the figure: 1. outer cylinder liner, 2. inner cylinder liner, 3. first end cover, 4. second end cover, 5. injection port, 6. grid groove, 7. labyrinth seal, 8. installation tool, 9. end flange, 10. pre-installed sleeve, 11. base cylinder, 12. inner cylinder liner grabbing tool, 13. pull rod, 14. end locking piece, 15. tapered steel plate, 16. step portion, 17. buffer gap. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] in Figure 1-5 The bimetallic cylinder liner of the present invention is described in detail in a step-by-step manner. Figure 6-11 The structure of the installation tool used in conjunction with the bimetallic cylinder sleeve of the present invention is described in detail.

[0039] See first Figure 1 and Figure 2 , respectively, are a schematic diagram of the overall outline structure of the bimetallic cylinder liner of the present invention and a schematic diagram of the split structure of the bimetallic cylinder liner of the present invention. The bimetallic cylinder liner of the present invention comprises an outer cylinder liner 1, an inner cylinder liner 2, a first end cover 3, and a second end cover 4; Figure 3 is a schematic diagram of the cross-sectional structure of the bimetallic cylinder liner of the present invention, combined with Figure 3 The inner cylinder liner 2 is nested in the outer cylinder liner 1. In the unassembled state, the outer diameter of the inner cylinder liner 2 is slightly larger than the inner diameter of the outer cylinder liner 1, for example, it has an interference size of 0.5mm-1mm; the first end cover 3 and the second end cover 4 are respectively fixed on one end of the outer cylinder liner 1 by bolts, and the inner diameters of the first end cover 3 and the second end cover 4 match the inner diameter of the inner cylinder liner 2, such as being the same or similar, and the first end cover 3 and the second end cover 4 are respectively supported on one end of the inner cylinder liner 2, so that the inner cylinder liner 2 after installation is axially restricted inside the outer cylinder liner 1.

[0040] The structural improvement of the bimetallic cylinder sleeve of the present invention mainly lies in the improvement of the outer cylinder sleeve 1 to adapt to the installation tool, as shown in the following example: Figure 4 , Figure 5 As shown, Figure 4 This is a schematic diagram of the three-dimensional structure of the outer cylinder sleeve of the bimetallic cylinder sleeve of the present invention. Figure 5 : It is a schematic diagram of the cross-sectional structure of the outer cylinder liner of the bimetallic cylinder liner of the present invention. The wall surface of the outer cylinder liner 1 is provided with an injection port 5 penetrating through the wall thickness thereof, and the inner wall surface of the outer cylinder liner 1 is provided with grid grooves 6 evenly distributed in a grid shape, and the opening position of the injection port 5 corresponds to a certain point in the grid groove 6, so that the injection port 5 is connected with the grid groove 6, and the fluid inside the grid groove 6 is connected with each other. Multiple narrow annular grooves arranged side by side are provided on the inner wall surface of the outer cylinder liner 1 near the two ends, so that after the inner cylinder liner 2 is installed into the outer cylinder liner 1, a labyrinth seal 7 is formed at both ends of the outer cylinder liner 1.

[0041] The above describes the structural characteristics of the bimetallic cylinder liner. The following further introduces the specific composition of the installation tool used in conjunction with the structural characteristics of the bimetallic cylinder liner.

[0042] Figure 6 is a schematic diagram of the overall structure of the installation tool of the present invention, Figure 7 Schematic diagram of the disassembled structure of the installation tool of the present invention, the installation tool 8 is composed of a pre-installation component and an inner cylinder liner grasping tool 12, the pre-installation component is fixedly mounted with a pre-installation sleeve 10, the inner cylinder liner grasping tool 12 is used to fix and grasp the inner cylinder liner 2, in the assembled state, Figure 6 As shown, the pre-installed sleeve 10 and the inner cylinder sleeve 2 are coaxially adjacent and side by side. First, the pre-installed sleeve 10 is assembled in the outer cylinder sleeve 1, and then the inner cylinder sleeve 2 is used to gradually replace the pre-installed sleeve 10 through axial movement to complete the assembly of the inner and outer cylinder sleeves of the bimetallic cylinder sleeve.

[0043] See also Figure 8, is a schematic diagram of the pre-installation component structure of the installation tool of the present invention, the pre-installation component includes a base cylinder 11 and a pre-installation sleeve 10 sleeved outside the base cylinder 11, the outer diameter of the pre-installation sleeve 10 is slightly smaller than the outer diameter of the inner cylinder sleeve 2, the difference between the two is preferably between 0.5mm-1.5mm, and the outer diameter of the pre-installation sleeve 10 is smaller than or equal to the inner diameter of the outer cylinder sleeve 1, that is, the pre-installation sleeve 10 can be easily installed into the outer cylinder sleeve 1 without the aid of external force tools; the base cylinder 11 is a cylinder shell structure, One end is formed as an end flange 9 fixedly connected to an external power part, and the other end has an inner diameter reduced to form an annular surface, and a plurality of bolt holes are evenly distributed on the annular surface. The pre-installed sleeve 10 is sleeved on the base cylinder 11, and the end of the pre-installed sleeve 10 is fitted with the annular surface. The pre-installed sleeve 10 is locked on the base cylinder 11 by bolts, and one end of the pre-installed sleeve 10 locked to the annular surface has a step portion 16 formed adjacent to the annular surface. When the installation tool is assembled, one end of the inner cylinder liner 2 grasped by the inner cylinder liner grasping tool 12 is nested on the step portion 16.

[0044] Fig. 9 It is a schematic diagram of the structure of the inner cylinder liner grasping tool in the installation tool of the present invention, the inner cylinder liner grasping tool 12 includes a pull rod 13 and a plurality of conical steel plates 15, and end locking members 14 are fixedly installed at both ends of the pull rod 13, respectively. The end locking member 14 can be used to prevent the conical steel plate 15 sleeved on the pull rod 13 from falling off, and the inner cylinder liner grasping tool 12 can be fixedly locked in the base cylinder 11 by means of shape matching or latch matching. Specifically, one end of the pull rod 13 extends into the hollow channel of the base cylinder 11, and is fixed to the base cylinder 11 by means of a locking member such as a locking pin or a keyway fitting or threaded screwing, or the end of the pull rod 13 extending out of the end flange 9 is fixed by the end locking member 14, and the other end of the pull rod 13 located outside the base cylinder 11 is sleeved with a plurality of conical steel plates 15, Fig.10 is a cross-sectional schematic diagram of the inner cylinder sleeve grabbing tool in the installation tool of the present invention, see Fig. 9 , Fig.10 The conical steel plates 15 are composed of 6 to 15 pieces stacked together to form a group. Two groups of conical steel plates 15 are mounted on the pull rod 13 in opposite directions. The two groups of conical steel plates 15 constitute a grabbing unit. One or more grabbing units can be installed on the pull rod 13. In the illustrated embodiment, the situation of setting two grabbing units is shown. When in use, the inner cylinder sleeve 2 is mounted on the grabbing unit. When the pull rod 13 is pulled, the conical steel plates 15 with the cone angle facing the opposite direction of the pulling direction have a tendency to expand their outer contours due to friction. The greater the pulling force, the greater the expansion tendency, and thus the greater the friction between the conical steel plates 15 and the inner cylinder sleeve 2, achieving friction self-locking, and the inner cylinder sleeve 2 can be firmly grasped.

[0045] Fig.11 1 is a schematic diagram of the structure of the tapered steel plate in the inner cylinder liner grabbing tool of the present invention. As shown in the figure, each tapered steel plate 15 is a tapered cylinder structure surrounded by steel plates. The inner diameter of the center hole of the tapered cylinder structure is adapted to the diameter of the pull rod 13 so as to be sleeved on the pull rod 13. Fig.11 A buffer gap 17 is left at the joint of the conical cylinder structure enclosed by the conical steel plate 15. The buffer gap 17 allows the conical steel plate 15 to be closed when subjected to circumferential pressure, so that the outer diameter of the contour of the conical cylinder structure has a reduced deformation range.

[0046] The pressurized replacement installation process of the bimetallic cylinder liner of the present invention is described in detail below with reference to the accompanying drawings.

[0047] The basic tools are an oil tank, a hydraulic pump, and a power tool (such as a motor, a hydraulic cylinder, a pneumatic cylinder, etc.). The outer cylinder liner 1 is supported and fixed inside the oil tank, and the depth of the hydraulic oil exceeds the height of the outer cylinder liner 1. A circulating steel pipe is arranged outside the oil tank, one end of which is connected to the bottom and the other end extends into the oil tank from the top and can be fixedly connected to the injection port 5 of the outer cylinder liner 1. The hydraulic pump is connected in series to the circulating steel pipe. The pre-installed sleeve 10 is bolted to the base tube 11, and then the pre-installed sleeve 10 is extended into the outer cylinder liner 1, and the pre-installed sleeve 10 is installed to the position where the inner cylinder liner 2 needs to be installed. It is preferred to install the pre-installed sleeve 1 0 is aligned with one end of the outer cylinder sleeve 1, and then the inner cylinder sleeve 2 is slowly put on the grasping unit at one end of the pull rod 13, the other end of the pull rod 13 is extended into the base cylinder 11, and the inner cylinder sleeve 2 is pushed to adjust its position, so that the end of the inner cylinder sleeve 2 is stuck on the step 16 of the pre-installed sleeve 10, and the end of the pull rod 13 extending into the base cylinder 11 is pulled, so that the grasping unit is deformed and grasps the inner cylinder sleeve 2 by friction, and then the pull rod 13 and the base cylinder 11 are relatively fixed; the power tool is fixedly connected to the end flange 9 of the base cylinder 11.

[0048] Start the hydraulic pump to pump hydraulic oil into the flow channel of the grid groove 6 between the outer cylinder liner 1 and the pre-installed sleeve 10, then pull the base cylinder 11 through a power tool, the pre-installed sleeve 10 gradually pulls out the outer cylinder liner 1, and the end of the inner cylinder liner 2 is stuck in the step 16 to overcome the friction and pull it into the outer cylinder liner 1. The other parts of the inner cylinder liner 2 are subjected to the hydraulic pressure, which compresses it to a slight deformation, greatly reducing the friction of the interference fit between the inner cylinder liner 2 and the outer cylinder liner 1, or the inner cylinder liner 2 is compressed under the hydraulic pressure to match or slightly smaller than the inner diameter size of the outer cylinder liner 1, thereby pulling the inner cylinder liner 2 into the outer cylinder liner 1 to achieve assembly of the two. After the inner cylinder liner 2 and the outer cylinder liner 1 are assembled, the relative fixation between the pull rod 13 and the base tube 11 is loosened, the inner cylinder liner grabbing tool 12 is removed, and then the assembled bimetallic cylinder liner is taken out and the internal hydraulic oil is poured out from the injection port 5, and the injection port 5 is sealed with a plug, and finally the first end cover 3 and the second end cover 4 are installed to complete the assembly of the bimetallic cylinder liner. Of course, if it is necessary to fill the gap in the grid groove 6, after pouring out the hydraulic oil, molten aluminum or aluminum alloy can be injected into the grid groove 6 between the outer cylinder liner 1 and the inner cylinder liner 2, and the injection port 5 can be sealed with a plug after cooling to achieve a firm installation of the inner cylinder liner 2 and the outer cylinder liner 1.

[0049] When the inner cylinder liner 2 is disassembled, since there is no need to consider whether it is subjected to excessive wear, the inner cylinder liner grabbing tool 12 can be used in conjunction with a power tool to pull it apart, or the inner cylinder liner 2 can be disassembled by reversing the installation steps in the oil tank.

[0050] 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. A pressurized replacement installation tool for a bimetallic cylinder liner, characterized in that: The bimetallic cylinder sleeve comprises an outer cylinder sleeve, an inner cylinder sleeve, a first end cover and a second end cover. The inner diameter of the outer cylinder sleeve is smaller than the outer diameter of the inner cylinder sleeve, so that the outer cylinder sleeve and the inner cylinder sleeve form an interference fit when assembled. The first end cover and the second end cover are respectively fixedly mounted at the two ends of the outer cylinder sleeve, and the first end cover and the second end cover respectively abut against the two ends of the inner cylinder sleeve; the inner surface of the outer cylinder sleeve is provided with grooves that are evenly distributed and fluidically connected to each other; the wall surface of the outer cylinder sleeve is provided with an injection port that penetrates the wall thickness, and the injection port is connected with the groove on the inner surface of the outer cylinder sleeve, and the injection port is blocked by plugging; the inner surface of the outer cylinder sleeve is provided with a labyrinth sealing structure near the two ends; The pressure-replaceable installation tool also includes a pre-installation component and an inner cylinder liner grasping tool, wherein the pre-installation component includes a base cylinder and a pre-installation sleeve, the pre-installation sleeve is fixedly sleeved on the outside of the base cylinder, the outer diameter of the pre-installation sleeve is less than or equal to the outer diameter of the inner cylinder liner, and is adapted to the inner diameter of the outer cylinder liner; one end of the inner cylinder liner grasping tool is fixedly connected to the base cylinder, and the other end thereof forms a grasping unit for firmly grasping the inner cylinder liner so that the inner cylinder liner and the pre-installation sleeve are coaxially adjacent to each other.

2. The pressure-replaceable installation tool according to claim 1, further characterized in that: The grooves are grid grooves distributed in a grid shape.

3. The pressure-replaceable installation tool according to claim 1, further characterized in that: The labyrinth seal structure is composed of 5 to 10 annular narrow grooves arranged side by side.

4. The pressure-replaceable installation tool according to claim 1 or 2, further characterized in that: The depth of the grooves on the inner surface of the outer cylinder sleeve is less than one quarter of the thickness of the outer cylinder sleeve.

5. The pressure-replaceable installation tool according to claim 1, further characterized in that: The inner cylinder liner grabbing tool comprises a pull rod and one or more grabbing units, wherein the grabbing unit is composed of two groups of conical steel plates, each group of conical steel plates comprises 6-15 pieces and are stacked together in the same direction, and the cone angles of the two groups of conical steel plates of each grabbing unit are opposite to each other; Each conical steel plate is a conical cylinder structure surrounded by steel plates. The inner diameter of the center hole of the conical cylinder structure is adapted to the diameter of the pull rod so as to be mounted on the pull rod. A narrow buffer gap in the shape of a slit is left at the joint on the side of the conical cylinder structure surrounded by the conical steel plates.

6. The pressure-replaceable installation tool according to claim 1 or 5, further characterized in that: The end of the pre-installed sleeve adjacent to the inner cylinder sleeve forms a step portion with a reduced outer diameter, and the end of the inner cylinder sleeve is inserted into the step portion, so that one end of the inner cylinder sleeve is fixedly abutted against one end of the pre-installed sleeve.

7. The pressure-replaceable installation tool according to claim 1, further characterized in that: The difference between the outer diameter of the pre-installed sleeve and the outer diameter of the inner cylinder sleeve is between 0.5 mm and 1.5 mm.

8. A pressurized replacement installation method, based on the pressurized replacement installation tool according to any one of claims 1 to 7, used for assembling a bimetallic cylinder liner, the specific method is as follows: The outer cylinder sleeve is supported and fixed inside the oil tank, and the depth of the hydraulic oil in the oil tank is kept to be greater than that of the outer cylinder sleeve; a circulating steel pipe is arranged outside the oil tank, one end of which is connected to the bottom, and the other end extends into the oil tank from the top and can be fixedly connected to the injection port of the outer cylinder sleeve, and the hydraulic pump is connected in series to the circulating steel pipe; The pre-installation sleeve is fixedly mounted on the base barrel, and then the pre-installation sleeve is extended into the outer cylinder sleeve and positioned at the position where the inner cylinder sleeve needs to be installed, and the end of the pre-installation sleeve that is extended first is aligned with the outer end of the outer cylinder sleeve; then the inner cylinder sleeve is firmly grasped with the inner cylinder sleeve using the inner cylinder sleeve grasping tool so that the inner cylinder sleeve is sleeved on the grasping unit at one end of the inner cylinder sleeve grasping tool; the other end of the inner cylinder sleeve grasping unit is extended into the interior of the base barrel so that the inner cylinder sleeve and the pre-installation sleeve are coaxially pressed against each other, and then the relative position of the inner cylinder sleeve grasping unit and the base barrel is fixed; The power tool is fixedly connected to the end flange of the base cylinder; Start the hydraulic pump and pump hydraulic oil into the groove between the outer cylinder sleeve and the pre-installed sleeve. Then, pull the base cylinder with a power tool, and the pre-installed sleeve gradually pulls out the outer cylinder sleeve. After the end of the inner cylinder sleeve overcomes the friction and is pulled into the outer cylinder sleeve, the other parts of the inner cylinder sleeve are subjected to the hydraulic pressure and are compressed to a micro-deformation by the hydraulic pressure, thereby relieving the friction of the interference fit between the inner cylinder sleeve and the outer cylinder sleeve, so that the inner cylinder sleeve gradually replaces the pre-installed sleeve and is pulled into the outer cylinder sleeve to realize the assembly of the inner cylinder sleeve and the outer cylinder sleeve. After the inner and outer cylinder sleeves are assembled, stop the operation of the hydraulic pump, remove the inner cylinder sleeve grabbing tool, release the position fixation of the outer cylinder sleeve, then take out the assembled bimetallic cylinder sleeve and pour out the internal hydraulic oil from the injection port, seal the injection port with a plug, and finally install the first end cover and the second end cover to complete the entire assembly of the bimetallic cylinder sleeve.

9. The pressure-replacement installation method according to claim 8 further comprises the following steps: After pouring out the hydraulic oil through the injection port, inject molten aluminum or aluminum alloy into the groove between the outer cylinder liner and the inner cylinder liner, and then seal the injection port with a plug after cooling.

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