CN113459035A

CN113459035A - Inner cylinder sleeve pulling tool for bimetal cylinder sleeve

Info

Publication number: CN113459035A
Application number: CN202110881687.4A
Authority: CN
Inventors: 秦刚
Original assignee: Jinan Longchao Petroleum Machinery Forging Co ltd
Current assignee: Jinan Longchao Petroleum Machinery Forging Co ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2021-10-01
Anticipated expiration: 2041-08-02
Also published as: CN113459035B

Abstract

The invention provides an inner cylinder sleeve pulling tool of a bimetallic cylinder sleeve, which is uniform in stress and deformation, can be locked in the inner cylinder sleeve, and can prevent the inner surface of the inner cylinder sleeve from slipping and wearing, and comprises a main shaft, wherein one or more disc springs are sleeved on the main shaft, each disc spring is of a spring-like structure formed by spirally surrounding a thin steel plate along a central shaft and is multi-layered in the axial direction, each section of ring body formed by spirally extending 360 degrees is disc-shaped, namely, the plane of the peripheral surface of the inner edge of each section of ring body protrudes out of the plane of the peripheral surface of the outer edge, so that the included angle between the radial extension line of the surface of the thin steel plate and the central axis of the disc spring is smaller than 90 degrees, and under the extrusion force of an end cover, the distance between the plane of the peripheral surface of the inner edge and the plane of the peripheral surface of the outer edge is shortened, thereby the diameter of the peripheral surface of the outer edge is enlarged; the main shaft is also provided with a driving mechanism, and the driving mechanism provides pushing pressure to compress the pulling piece.

Description

Inner cylinder sleeve pulling tool for bimetal cylinder sleeve

Technical Field

The invention relates to the technical field of slurry pump cylinder sleeve accessories and bimetallic cylinder sleeves, in particular to an inner cylinder sleeve pulling tool for a bimetallic cylinder sleeve.

Background

The working medium of the slurry pump is usually extremely strong in abrasiveness, the metal cylinder sleeve as a core working accessory in the slurry pump is naturally high in replacement frequency caused by abrasion, and the existing inner cylinder sleeve and inner liner sleeve are generally pulled out by adopting a method that an extending piece expands inwards and then drives an inner liner sleeve to be pulled out by friction force, and the contact mode of the extending piece and the inner bore surface of the liner sleeve is generally divided into an integral surface contact mode and a local contact mode, for example, an inner embedded liner sleeve pulling method is disclosed in patent document CN111360751A, wherein an elastic expansion sleeve extends into an inner bore of a workpiece liner sleeve, then a conical guide expansion rod with a large upper part and a small lower part is inserted into the elastic expansion sleeve, and the outer diameter of a conical profile is continuously increased along with the insertion of the conical guide expansion rod, so that the profile outer diameter of the elastic expansion sleeve is gradually expanded, and the outer surface of the elastic expansion sleeve is tightly pressed and attached to the inner surface of the inner bore of the workpiece liner sleeve, then pulling the rod body at the rear end of the conical guide expansion rod to pull out the workpiece bushing, wherein the outer surface of the elastic expansion sleeve is in integral surface contact with the inner surface of the inner hole of the bushing, but the diameter of the conical guide expansion rod is gradually changed along the axial direction, and the extrusion force applied to the elastic expansion sleeve is also gradually changed along the axial direction, so that the friction force between the bushing and the elastic expansion sleeve is not uniformly distributed, the bushing is easy to slip, and the elastic expansion sleeve is easy to partially damage due to different deformation along with the increase of the use times;

patent document CN106891294A discloses a tensioning and pulling device in a diesel engine cylinder liner, which includes a conical surface pulling rod, a plurality of open slots are arranged at the end of the conical surface pulling rod in a circumferential array, a tensioning block is inserted into each open slot, each tensioning block includes an arc plate and a rod body connected with the arc plate, the arc plates of all the tensioning blocks are spliced into a cylindrical surface, the rod body transfers the force provided by the conical surface of the conical surface pulling rod to the pushing force pushing the arc plate radially outwards, the arc plate and the inner surface of the cylinder liner are pressed and attached to generate the friction force required for pulling, the pulling device of this type will share the contact force with the inner surface of the cylinder liner for a plurality of equal local areas (arc plates), the stress on each area is relatively balanced, but the distribution of the force along the axial direction is unbalanced, and the problem of easy slippage when pulling the cylinder liner in interference fit is not solved.

In view of the assembly mode of the interference fit of the bimetallic cylinder sleeve and the higher replacement frequency, the existing inner cylinder sleeve pulling tool needs to be improved, the condition that the inner surface of the cylinder sleeve is abraded again due to unbalanced stress and easy slipping is overcome, and meanwhile, the bimetallic cylinder sleeve can be pulled by full mechanical force, so that the efficiency is improved.

Disclosure of Invention

Based on the aim, the invention provides the inner cylinder sleeve pulling tool for the bimetallic cylinder sleeve, which is uniform in stress and deformation, can be locked in the inner cylinder sleeve, and prevents the inner surface of the inner cylinder sleeve from being slipped and abraded.

The technical scheme adopted by the invention is as follows: the tool for pulling the inner cylinder sleeve of the bimetallic cylinder sleeve is characterized by comprising a main shaft, wherein one or more pulling pieces are sleeved on the main shaft, and the outer diameter of the profile of each pulling piece can be increased when the pulling piece is pushed and pressed, so that the pulling piece can extend into an inner hole of the inner cylinder sleeve when not pushed and pressed, and can be radially increased to be tightly attached to the surface of the inner hole of the inner cylinder sleeve when the pulling force is applied; the main shaft is further provided with a driving mechanism, the driving mechanism provides pushing pressure to compress the pulling part, the driving mechanism can be an electric mechanism or a hydraulic mechanism, and specifically, the main shaft is further sleeved with a limiting end cover and a pushing end cover, and the limiting end cover is fixed relative to the main shaft; the limiting end cover radially and symmetrically extends to two sides to form a connecting end, the pushing end cover also radially extends to two sides to form a connecting end, driving mechanisms are installed between the limiting end cover and the connecting ends on two sides of the pushing end cover, and the driving mechanisms can push the pushing end cover to move along the main shaft to push the pulling piece.

The pulling part is a disc spring which is a multi-layer spring-like structure formed by spirally surrounding a thin steel plate along a central shaft in the axial direction, each section of ring body formed by spirally extending 360 degrees is disc-shaped, namely, the plane of the peripheral surface of the inner edge of each section of ring body protrudes out of the plane of the peripheral surface of the outer edge, so that the included angle between the radial extension line along the surface of the thin steel plate and the central axis of the disc spring is less than 90 degrees, and under the extrusion force of the pushing end cover, the distance between the plane of the peripheral surface of the inner edge and the plane of the peripheral surface of the outer edge is shortened, so that the diameter of the peripheral surface of the outer edge is enlarged; firm support and lean on the interior cylinder liner internal surface of bimetal cylinder liner, when the action of pulling out moreover, belleville spring has the trend that continues deformation in order to continue to enlarge whole external diameter to make the frictional force of belleville spring outer peripheral face and interior cylinder liner internal surface have the trend of increase, form the auto-lock effect, effectively prevented the slippage phenomenon of pulling out the in-process, the cylinder liner internal surface is not worn and torn by the instrument of pulling out further in the protection. And a plurality of notches are uniformly formed in the peripheral surface of the disc spring, namely the side surface of the disc spring in the thickness direction of the thin steel plate, and the notches can effectively increase the friction force when the peripheral surface of the disc spring is abutted against the inner surface of the inner cylinder sleeve.

The disc spring is sleeved on the main shaft, one or more keys extending along the axial direction are arrayed on the circumference of the main shaft in an array mode, the central holes of the pulling part and the pushing end cover and the main shaft form key grooves to be matched and sleeved on the main shaft, and therefore the pulling part and the pushing end cover can only slide along the axial direction of the main shaft and cannot rotate relatively.

The one end fixed mounting of main shaft connects the ring flange, and other end fixed mounting has the end nut, the end nut is used for restricting the piece of pulling out and breaks away from the main shaft, connect the ring flange and be used for forming flange joint with the mechanical equipment that provides tensile to accomplish the action of pulling out. The limiting end cover can be directly abutted against the connecting flange plate to be installed on the main shaft, and the connecting flange plate is used for limiting the movement of the main shaft.

When the main shaft is sleeved with a plurality of disc springs, the main shaft is also sleeved with a plurality of partition plates which sequentially partition the disc springs, so that the disc springs connected in series are uniformly stressed and deformed under the pushing of the driving mechanism.

The advantages of the invention are as follows:

1. the pulling part is made of metal materials, the affordable pressure is increased, and the pulling part cannot deform reversely under radial pressure, so that the pulling part can be firmly locked in the bimetallic cylinder sleeve, and the requirement of great pulling force caused by an installation mode of interference assembly of the bimetallic cylinder sleeve can be effectively met; during the pulling action, the disc spring has the tendency of further deforming to increase the outer diameter under the pulling force, thereby forming the self-locking effect and preventing the large pulling force from sliding down and wearing;

2. the spring-like structure enables the pulling part to be stressed evenly, and the friction force is evenly distributed on the pulling part and the inner surface of the inner cylinder sleeve, so that the slipping phenomenon caused by the unbalanced deformation of the pulling part due to unbalanced stress is prevented;

3. the disc springs can be connected in series and overlapped according to requirements, so that the pulling tool can be increased in a modularized mode, and the double-metal cylinder sleeve is particularly suitable for the problem that the double-metal cylinder sleeve of the slurry pump is large in length and difficult to detach.

Drawings

FIG. 1 is a schematic view of the overall construction of the extraction tool of the present invention;

FIG. 2 is a schematic view of the spindle backbone structure of the extraction tool of the present invention;

FIG. 3 is a schematic view of the extractor tool of the present invention in an installed condition;

FIG. 4 is a schematic view of the structure of the disc spring of the pulling tool of the present invention;

FIG. 5 is a schematic cross-sectional view of a disc spring of the pulling tool of the present invention;

FIG. 6 is a schematic structural view of another embodiment of the extractor member of the extractor tool of the present invention;

in the figure: 1. the device comprises a main shaft, 2, a connecting flange plate, 3, a limiting end cover, 4, a pushing end cover, 5, a hydraulic cylinder, 6, a disc spring, 7, an end nut, 8, a partition plate, 9, a disc and 10 bases.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the disclosure herein.

Referring to the drawings, the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present disclosure can be implemented, so that the present disclosure has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the disclosure of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. Meanwhile, the positional limitation terms used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship therebetween may be regarded as the scope of the present invention without substantial changes in the technical content.

Fig. 1 is a schematic view of the overall structure of the pulling tool of the present invention, and as shown in the figure, the pulling tool of the inner cylinder sleeve of the present invention includes a main shaft 1, a connecting flange 2 is fixedly connected to an end of the main shaft 1, and the connecting flange 2 is used for forming a flange connection with a mechanical device providing a pulling force to complete the pulling action; one or more extracting pieces are sleeved on the main shaft 1, and the extracting pieces can be pushed to increase the outer diameter of the profile, so that the extracting pieces extend into an inner hole of the inner cylinder sleeve when not subjected to pushing force, and radially increase to form close fit with the surface of the inner hole of the inner cylinder sleeve when subjected to the pushing force; the connecting flange plate 2 with install actuating mechanism between the extraction piece, actuating mechanism is used for providing the bulldozing force that pushes away the extraction piece, actuating mechanism can select for electric mechanism or hydraulic pressure mechanism, in this embodiment, actuating mechanism is pneumatic cylinder 5, pneumatic cylinder 5 includes two, and it installs the left and right sides at main shaft 1 through spacing end cover 3 and bulldozing end cover 4 symmetry.

As shown in fig. 2, which is a schematic view of the main shaft framework structure of the extraction tool of the present invention, one end of the main shaft 1 is fixedly installed with the connecting flange 2, the other end is fixedly installed with the end nut 7, and the spindle 1 is provided with one or more keys extending along the axial direction in a circumferential array, the circumferential array is provided with a plurality of keys in the embodiment, the main shaft 1 is fixedly sleeved with a limiting end cover 3 against a connecting flange 2, the limiting end cover 3 radially and symmetrically extends towards two sides to form a connecting end head, the main shaft 1 is also sleeved with a pushing end cover 4, the pushing end cover 4 also radially extends towards two sides to form a connecting end, two hydraulic cylinders 5 are respectively arranged between the limiting end cover 3 and the connecting end at two sides of the pushing end cover 4, the central hole of the pushing end cover 4 forms a key groove fit with the main shaft 1, and the pushing end cover 4 is limited to be capable of sliding axially along the main shaft 1 under the pushing of the hydraulic cylinder 5 so as to push or release the pulling part; the main shaft 1 is further sleeved with a plurality of partition plates 8, and the partition plates 8 are used for separating the plurality of pulling pieces when the pulling pieces are installed, so that the pulling pieces can bear the pushing force for pushing the end cover 4 more uniformly. As shown in fig. 3, it is a schematic diagram of the mounting state of the pulling member of the pulling tool of the present invention, which symbolically shows the mounting state when three pulling members are mounted on the main shaft 1, the pulling member of the present invention is a disc spring structure with innovative design, as shown in the figure, a spacing plate 8 is mounted between two disc springs 6 to prevent the disc springs 6 from being deformed unevenly when a plurality of disc springs 6 are mounted in series.

Fig. 4 is a schematic structural diagram of a disc spring of the extraction tool of the present invention, and fig. 5 is a schematic sectional structural diagram of a disc spring of the extraction tool of the present invention, as shown in the figure, the disc spring 6 is a spring-like structure formed by spirally surrounding a thin steel plate along a central axis, and a ring body formed by spirally extending each section for 360 degrees is in a disc shape, that is, a plane of an inner peripheral surface of each section of the ring body protrudes from a plane of an outer peripheral surface, so that an included angle between a radial extension line along the surface of the thin steel plate and a central axis of the disc spring 6 is less than 90 degrees, and under the pressing force of the pressing end cap 4, a distance between the plane of the inner peripheral surface and the plane of the outer peripheral surface is shortened, so that the diameter of the outer peripheral surface is enlarged and stably abutted against the inner surface of the inner cylinder liner of the bimetallic cylinder liner. So set up, not only make disc spring 6 can receive to bulldoze increase external diameter "grab" the interior cylinder liner of tight bimetal cylinder liner, and the butterfly-shaped structure, when pulling out the action, disc spring 6 has the trend that continues deformation in order to continue to enlarge whole external diameter, thereby make the frictional force of 6 outer peripheral faces of disc spring and interior cylinder liner internal surface have the trend of increase, form the auto-lock effect, the slippage phenomenon of pulling out the in-process has effectively been prevented, cylinder liner internal surface does not receive the instrument of pulling out further wearing and tearing in the protection.

The end part of the disc spring 6 is also provided with a circular ring-shaped base, the outer diameter of the base is smaller than the whole outer diameter of the disc spring 6, and the thin steel plate extends from the base and surrounds to form a spring-like structure which is multi-layer in the axial direction; the profile shape of a central hole formed by the peripheral surface of the inner edge of the disc spring 6 is matched with the cross section shape of the main shaft 1, so that the disc spring 6 is sleeved on the main shaft 1 and then forms a key groove fit between the disc spring and the main shaft 1, and the disc spring 6 is prevented from rotating along the circumferential direction of the main shaft 1. A plurality of notches are uniformly formed in the outer peripheral surface of the disc spring 6, namely the side surface in the thickness direction of the thin steel plate, and the notches can effectively increase the friction force when the outer peripheral surface of the disc spring 6 is abutted against the inner surface of the inner cylinder sleeve.

With reference to fig. 1 and 2, in the present embodiment, four disc springs 6 are provided, and each two disc springs are separated by a partition plate 8, in other embodiments, the number of the disc springs 6 may be multiple according to actual requirements, for example, the length of the bimetallic cylinder sleeve of a part of slurry pumps is longer, and the number of the disc springs 6 may be set according to the actual length of the bimetallic cylinder sleeve, so as to uniformly disperse friction force and increase the overall friction force between the pulling tool and the inner cylinder sleeve.

The disc spring 6 of the present invention may also be composed of other structures that can achieve the same function, as shown in fig. 6, which is a schematic structural view of another embodiment of the pulling member of the pulling tool of the present invention, and includes a disc 9 and a base 10, the base 10 is a metal ring with a central hole, the cross-sectional shape of the central hole matches with the cross-sectional shape of the main shaft 1, so that the base 10 can only slide along the main shaft 1 axially and cannot rotate relatively; the disk 9 is a disk-shaped structure which extends outwards from one side surface of the base 10 in the radial direction and extends outwards in the axial direction, and the disk 9 can be reduced in axial depth and increased in radial outer diameter when being extruded. When the pulling piece is sleeved on the main shaft 1, the base 10 is abutted to the inner part of the disc 9 of the other pulling piece, and the pulling pieces are sequentially sleeved on the main shaft 1 according to the sequence of the same direction to reach the length required by pulling the inner cylinder sleeve.

The working principle of the extraction tool of the invention is explained in connection with fig. 1 as follows: the outer cylinder sleeve of the fixed clamp bimetal cylinder sleeve, one end part of the disc spring 6 to be installed extends into the inner cylinder sleeve of the bimetal cylinder sleeve, the end cover 4 is pushed and pushed by the driving mechanism (such as hydraulic oil is injected into the hydraulic cylinder 5), the end cover 4 is pushed and pushed to compress the disc spring 6 along the sliding of the main shaft 1 until the outer diameter of the disc spring 6 is tightly abutted to the inner hole surface of the inner cylinder sleeve, then the connecting flange plate 2 is connected with an external tension mechanical bolt, and the outer tension pulling device is utilized to pull the inner cylinder sleeve and the outer cylinder sleeve of the bimetal cylinder sleeve to be separated.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The inner cylinder sleeve pulling tool for the bimetallic cylinder sleeve is characterized by comprising a main shaft, wherein one or more pulling pieces are sleeved on the main shaft, and the outer diameter of the outline of each pulling piece can be increased when the pulling pieces are pushed and pressed; the main shaft is also provided with a driving mechanism, and the driving mechanism provides pushing pressure to compress the pulling piece.

2. The inner cylinder liner extraction tool according to claim 1, further characterized in that the extraction member is a disc spring, the disc spring is a thin steel plate spirally wound around a central axis to form a multi-layer spring-like structure in the axial direction, and each section of ring body formed by spirally extending 360 degrees is disc-shaped, that is, a plane of an inner peripheral surface of each section of ring body protrudes out of a plane of an outer peripheral surface, so that an included angle between a radial extension line along the surface of the thin steel plate and a central axis of the disc spring is smaller than 90 degrees, and under the extrusion force of the pushing end cover, a distance between the plane of the inner peripheral surface and the plane of the outer peripheral surface is shortened, thereby enlarging the diameter of the outer peripheral surface;

the disc spring is sleeved on the main shaft.

3. The inner cylinder sleeve pulling tool according to claim 1, further characterized in that a limiting end cover and a pushing end cover are further sleeved on the main shaft, and the limiting end cover is fixed relative to the main shaft; the limiting end cover radially and symmetrically extends to two sides to form a connecting end, the pushing end cover also radially extends to two sides to form a connecting end, driving mechanisms are installed between the limiting end cover and the connecting ends on two sides of the pushing end cover, and the driving mechanisms can push the pushing end cover to move along the main shaft to push the pulling piece.

4. The inner cylinder liner extraction tool of claim 3, further characterized in that the drive mechanism is an electric motor or a hydraulic cylinder.

5. The inner cylinder liner extraction tool of claim 1, further characterized in that a connection flange is fixedly mounted at one end of the main shaft, an end nut is fixedly mounted at the other end of the main shaft, the end nut is used for limiting the extraction member to be detached from the main shaft, and the connection flange is used for forming flange connection with mechanical equipment providing pulling force to complete extraction.

6. The inner cylinder liner extraction tool of claim 3, further characterized in that the spindle has one or more axially extending keys circumferentially arrayed thereon, and the central bores of the extraction member and the push end cap are both splined to the spindle and are nested on the spindle.

7. The inner cylinder liner extraction tool of claim 1, further characterized in that a plurality of spacer plates are further nested on the spindle for spacing the plurality of extractors from one another.

8. The tool for pulling out an inner cylinder liner according to claim 2, further characterized in that a plurality of notches are uniformly formed in the outer peripheral surface of the disc spring, i.e., the side surface in the thickness direction of the thin steel plate.