CN107791204A - A disassembly tool for tubular parts - Google Patents

Abstract

The invention discloses a tubular part disassembling tool, and belongs to the field of hand tools. This assembly and disassembly tools includes the ejector pin, sleeve pipe and slips, the sleeve pipe coaxial line cover is located outside the ejector pin, the one end of ejector pin is the frustum form, be equipped with the external screw thread on the lateral wall at the middle part of ejector pin, the other end of ejector pin stretches out outside the sleeve pipe, sheathed tube inner wall is equipped with external screw thread assorted internal thread, sheathed tube one end is equipped with a plurality of through-holes, equal movable mounting has a slips in every through-hole, a side of every slips contacts with the conical surface that is the frustum form one end of ejector pin, through the one end of twisting the sleeve pipe that stretches out of the ejector pin, make the ejector pin move towards the one end that has the through-hole on the sleeve pipe, the conical surface that is the frustum form one end through on the ejector pin promotes the slips, push up the slips tightly on the inside wall of tubular part, make can rotate through the centre.

Description

A disassembly tool for tubular parts

technical field

The invention relates to the field of hand tools, in particular to a disassembly tool for tubular parts.

Background technique

Threaded connection is a very common connection method, which is widely used in the connection between various tubular parts.

The connected part of the tubular part is usually provided with an internal thread or an external thread, which can be connected with an external thread or an internal thread on another part. When two tubular parts are connected or disconnected, The tubular parts need to be clamped by pipe wrench or other dismounting tools to make the two tubular parts rotate relative to each other. However, due to the structural limitations on the outer surface of some tubular parts, for example, some pipes are equipped with valves, it is inconvenient to use clamping tools to clamp the outer surface, and some tubular parts have higher requirements on the quality of the outer surface. During the holding process, because the tool will cause certain damage to the outer wall of the tubular part, it may affect the normal use of the tubular part. The surface needs to be used for sealing, so the quality of the outer surface is relatively high. If clamping tools such as pipe wrench are used to disassemble the thread during the process of assembling and disassembling the packer, the outer surface of these tubular parts may appear Therefore, the existing disassembling tools cannot meet the requirements of these two types of tubular parts.

Contents of the invention

In order to solve the problem that the tubular part cannot be clamped or the outer wall of the tubular part may be damaged when the tubular part is disassembled, an embodiment of the present invention provides a disassembly tool for the tubular part. Described technical scheme is as follows:

An embodiment of the present invention provides a disassembly and assembly tool for tubular parts. The disassembly and assembly tool includes: a push rod, a sleeve and a slip. The sleeve is coaxially sleeved outside the push rod, and the push rod is One end of the rod is in the shape of a truncated cone, an external thread is provided on the outer wall of the middle part of the push rod, and the other end of the push rod protrudes out of the casing;

The inner wall of the sleeve is provided with an internal thread that matches the external thread, and one end of the sleeve is provided with a plurality of through holes, and the plurality of through holes are evenly arranged along the circumference of the sleeve, each One slip is movably installed in each of the through holes, and one side of each slip is in contact with the tapered surface at one end of the truncated cone of the push rod.

Preferably, the side of the slip in contact with the tapered surface is a concave surface, and the concave surface fits on the tapered surface.

When implemented, the dismounting tool further includes a limiting structure installed on the sleeve, and the limiting structure is used to limit the radial displacement of the slip along the ejector rod.

Further, the limiting structure includes an elastic piece, one end of the elastic piece is fixedly connected to the sleeve, and the other end of the elastic piece is pressed against the other side of the slip.

Further, a groove is provided on the other side of the slip, and the elastic piece is pressed into the groove.

Preferably, the end surface of the sleeve at which the through hole is disposed is closed.

Preferably, the sleeve includes a first cylinder and a second cylinder arranged coaxially, the through hole is provided on the first cylinder, and the internal thread is provided on the second cylinder, The first cylinder and the second cylinder are in the shape of cylindrical tubes, and the outer diameter of the second cylinder is larger than that of the first cylinder.

Optionally, the other end of the push rod is in the shape of a hexagonal prism, the sleeve includes a first cylinder and a second cylinder coaxially arranged, the through hole is arranged on the first cylinder, and the The internal thread is arranged on the second cylinder, and the second cylinder is in the shape of a hexagonal column.

Preferably, the sleeve is provided with three through holes.

Optionally, an anti-slip structure is provided on the other side of the slips facing away from the inner side of the sleeve.

In the embodiment of the present invention, a sleeve is sleeved coaxially on the ejector rod. One end of the ejector rod is in the shape of a truncated cone, and an external thread is provided on the outer wall of the middle part. There is a through hole at the position of one end corresponding to the frustum-shaped end of the ejector rod, and slips are arranged in the through hole, so that one end of the casing can be inserted into the tubular part to be disassembled, and by twisting the extension of the ejector rod Out of the casing, move the ejector rod toward the end with the through hole in the casing, push the slip through the conical surface of the cone-shaped end of the ejector rod, and tighten the slip on the inner wall of the tubular part , so that the casing can be held and rotated by the clamping tool, so that the disassembly and assembly of the tubular part can be realized, and the damage to the outer wall of the tubular part can be avoided.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a structural diagram of a disassembly tool for a tubular part provided by an embodiment of the present invention;

Fig. 2 is a schematic structural view of a push rod provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a casing provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a slip provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of the installation of a slip provided by the embodiment of the present invention;

Fig. 6 is A-A sectional view among Fig. 5;

Fig. 7 is a schematic structural diagram of another casing provided by an embodiment of the present invention;

Fig. 8 is a schematic structural view of another ejector pin provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

An embodiment of the present invention provides a tool for disassembling and assembling a tubular part, and the disassembling tool is suitable for disassembling and assembling the tubular part. Fig. 1 is a structural diagram of a disassembly and assembly tool for tubular parts provided by an embodiment of the present invention. As shown in Fig. 1, the disassembly and assembly tool includes: a mandrel 10, a sleeve 20 and a slip 30, and the sleeve 20 is coaxial The wire is sleeved outside the ejector rod 10. FIG. 2 is a schematic structural view of a ejector rod provided by an embodiment of the present invention. FIG. 3 is a schematic structural view of a casing provided by an embodiment of the present invention. With reference to FIGS. One end of the push rod 10 is in the shape of a truncated cone, and the outer wall of the middle part of the push rod 10 is provided with an external thread 12a. Matching internal thread 20a, one end of the sleeve 20 is provided with a plurality of through holes 20b, the plurality of through holes 20b are evenly arranged along the circumference of the sleeve 20, and a slip 30 is movably installed in each through hole 20b, each One side surface of the slip 30 is in contact with the tapered surface 11 a at one end of the truncated cone of the push rod 10 .

In the embodiment of the present invention, a sleeve is sleeved coaxially on the ejector rod. One end of the ejector rod is in the shape of a truncated cone, and an external thread is provided on the outer wall of the middle part. There is a through hole at the position of one end corresponding to the frustum-shaped end of the ejector rod, and slips are arranged in the through hole, so that one end of the casing can be inserted into the tubular part to be disassembled, and by twisting the extension of the ejector rod Out of the casing, move the ejector rod toward the end with the through hole in the casing, push the slip through the conical surface of the cone-shaped end of the ejector rod, and tighten the slip on the inner wall of the tubular part , so that the casing can be held and rotated by the clamping tool, so that the disassembly and assembly of the tubular part can be realized, and the damage to the outer wall of the tubular part can be avoided.

In this embodiment, the ejector rod 10 includes a first section 11, a second section 12 and a third section 13 arranged in sequence on the coaxial line, one end of the first section 11 is in the shape of a truncated cone, and its outer wall is a conical surface 11a , the outer wall of the second section 12 is provided with an external thread 12a, and at least part of the third section 13 is exposed outside the sleeve 20; the side wall of the first end of the sleeve 20 is provided with a plurality of Through holes 20b, a plurality of through holes 20b are evenly arranged along the circumference of the sleeve 20, the second end of the sleeve 20 opposite to the first end is provided with an internal thread 20a that is compatible with the external thread 12a; the slips 30 and The through holes 20b are provided in one-to-one correspondence, and the slips 30 are movably installed in the corresponding through holes 20b, and one side of the slips 30 is in contact with the tapered surface 11a, and the other side of the slips 30 is exposed outside the casing 20.

Preferably, the end face of the sleeve 20 where the through hole 20 b is provided is closed, so that the mechanical strength of the sleeve 20 can be increased and deformation of the sleeve 20 can be avoided.

Fig. 4 is a schematic structural diagram of a slip provided by an embodiment of the present invention. As shown in Fig. 4, the side of the slip 30 in contact with the tapered surface 11a is a concave surface 30c. Fig. 5 is a slip provided by an embodiment of the present invention Fig. 6 is a cross-sectional view of A-A in Fig. 5. As shown in Fig. 5 and Fig. 6, the concave surface 30c fits on the conical surface 11a, thereby increasing the contact area between the slips 30 and the conical surface 11a, which can When the inner wall of the tubular part to be disassembled is tightened by the slips 30, the pressure of the slips 30 on the conical surface 11a is reduced to avoid damage to the conical surface 11a and prolong the service life of the disassembly tool.

In addition, the other side of the slip 30 is provided with an anti-slip structure 30a, the friction force between the slip 30 and the inner wall of the tubular part to be disassembled can be increased by the anti-slip structure 30a, so as to avoid that when the sleeve 20 is twisted, Slip occurs between the slips 30 and the tubular part to be disassembled.

It should be noted that although the anti-slip structure 30a provided in the embodiment of the present invention is strip-shaped, in other embodiments the anti-slip structure 30a may also be a wave-shaped or other shaped structure, and the present invention is not limited thereto .

Preferably, the dismounting tool also includes a limiting structure installed on the sleeve 20, the limiting structure is used to limit the radial displacement of the slip 30 along the push rod 10, so as to prevent the slip 30 from slipping from the through hole when not in use. 20b out.

Specifically, referring to FIG. 1 , the limiting structure includes an elastic piece 41, one end of the elastic piece 41 is fixedly connected to the sleeve 20, and the other end of the elastic piece 41 is pressed on the other side of the slip 30, and the elastic piece 41 can prevent the , the slips 30 come out from the through hole 20b, and the structure is simple.

Specifically, the position-limiting structure further includes a pin 42 through which the elastic piece 41 is fixedly connected to the outer wall of the sleeve 20 . The pin 42 is convenient for disassembly and replacement of the elastic piece 41 .

As shown in FIG. 4 , the part of the slip 30 in contact with the elastic piece 41 is provided with a groove 30b, and the elastic piece 41 is pressed in the groove 30b, which can better prevent the slip 30 from coming out of the through hole 20b.

Preferably, the depth of the groove 30b is not less than the height of the elastic piece 41 in the moving direction of the slip 30, so as to prevent the elastic piece 41 from being pressed against the inner wall of the tubular part to cause deformation or It is damaged, prolonging the service life of shrapnel 41.

It should be noted that although each slip 30 shown in FIG. 1 is provided with only one elastic piece 41 , in actual design, each slip 30 may also be provided with two or more elastic pieces 41 correspondingly.

As shown in Figure 3, the casing 20 includes a first cylindrical body and a second cylindrical body coaxially arranged, the through hole 20b is arranged on the first cylindrical body, the internal thread 20a is arranged on the second cylindrical body, and the first cylindrical body The outer diameter of the second cylindrical body and the second cylindrical body are larger than the outer diameter of the first cylindrical body, so that it can be conveniently clamped by clamping tools such as pipe wrench.

Fig. 7 is a schematic structural view of another bushing provided by an embodiment of the present invention, and Fig. 8 is a schematic structural view of another ejector provided by an embodiment of the present invention, the bushing 20 in Fig. 7 and the ejector rod in Fig. 8 10 is basically the same structure as the bushing 20 and the push rod 10 in Fig. 1, the difference is that, in Fig. 5 and Fig. The first cylindrical body and the second cylindrical body are arranged, the through hole 20b is arranged on the first cylindrical body, the internal thread 20a is arranged on the second cylindrical body, the second cylindrical body is in the shape of a hexagonal column, and the outer wall of the regular hexagon has Facilitate the use of clamping tools.

It is conceivable that the cross-sections of the third section 13 and the second cylindrical body of the sleeve 20 can also be set to other shapes that facilitate the use of the clamping tool, such as a square and the like.

In this embodiment, three through-holes 20b are provided on the sleeve 20, and the angular interval between two adjacent through-holes 20b is 120°, and three slips 30 are installed accordingly, so that the tubular to be disassembled can be The inner wall of the part is more uniformly stressed, avoiding deformation due to uneven force.

In other embodiments, more through holes 20 b may be provided to install more slips 30 .

The following is a brief description of the use of this disassembly tool:

First twist the third section 13 of the push rod 10 to adjust the height of the slips 30 protruding from the outer surface of the sleeve 20 so that the first end of the sleeve 20 can be inserted into the tubular part to be disassembled, and then the sleeve The first end of the pipe 20 extends into the tubular part to be disassembled, and the outer sidewall of the second end of the sleeve 20 and the outer sidewall of the third section 13 of the push rod 10 are respectively clamped by two clamping tools, and screwed The third section 13 of the ejector rod 10 is moved, so that the ejector rod 10 extends into the sleeve 20, and the slip 30 is pushed through the tapered surface 11a, so that the slip 30 is pressed against the inner side wall of the tubular part to be disassembled, Afterwards, the outer side wall of the second end of the casing 20 is clamped and twisted by a clamping tool to disassemble the tubular part to be disassembled, and finally the ejector rod 10 is unscrewed so that the slips 30 loosen the tubular part to be disassembled , to remove the disassembly tool from the tubular part to be disassembled.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A dismounting tool for tubular parts, characterized in that the dismounting tool comprises: a mandrel (10), a sleeve (20) and slips (30), and the sleeve (20) is coaxial Sleeved on the outside of the push rod (10), one end of the push rod (10) is in the shape of a truncated cone, and an external thread (12a) is provided on the outer wall of the middle part of the push rod (10). The other end of the rod (10) stretches out of the sleeve (20); The inner wall of the sleeve (20) is provided with an internal thread (20a) matching the external thread (12a), and one end of the sleeve (20) is provided with a plurality of through holes (20b). A through hole (20b) is evenly arranged along the circumference of the sleeve (20), and a slip (30) is movably installed in each through hole (20b), and each slip (30) ) is in contact with the tapered surface (11a) at one end of the truncated cone of the push rod (10). 2. The assembly and disassembly tool according to claim 1, characterized in that, the side of the slips (30) in contact with the tapered surface (11a) is a concave surface (30c), and the concave surface (30c) is attached to on the conical surface (11a). 3. The assembly and disassembly tool according to claim 1, characterized in that, the assembly and disassembly tool further comprises a position-limiting structure installed on the sleeve (20), and the position-limiting structure is used to limit the card The displacement of the shoe (30) along the radial direction of the push rod (10). 4. The assembly and disassembly tool according to claim 3, characterized in that, the position-limiting structure comprises a shrapnel (41), one end of the shrapnel (41) is fixedly connected to the sleeve (20), the The other end of the shrapnel (41) is pressed against the other side of the slip (30). 5. The assembly and disassembly tool according to claim 4, characterized in that a groove (30b) is provided on the other side of the slip (30), and the shrapnel (41) is pressed against the groove ( 30b). 6. The dismounting tool according to any one of claims 1-5, characterized in that, the end face of the sleeve (20) at which the through hole (20b) is disposed is closed. 7. The assembly and disassembly tool according to any one of claims 1 to 5, characterized in that, the sleeve (20) comprises a first cylinder and a second cylinder arranged coaxially, and the through hole (20b ) is arranged on the first cylinder, the internal thread (20a) is arranged on the second cylinder, the first cylinder and the second cylinder are cylindrical, and the second cylinder The outer diameter of the body is larger than the outer diameter of the first cylinder. 8. The assembly and disassembly tool according to any one of claims 1 to 5, characterized in that, the other end of the push rod (10) is in the shape of a hexagonal column, and the sleeve (20) includes a coaxially arranged first A cylinder and a second cylinder, the through hole (20b) is arranged on the first cylinder, the internal thread (20a) is arranged on the second cylinder, and the second cylinder is Hexagonal prism tubular. 9. The assembly and disassembly tool according to any one of claims 1-5, characterized in that three through holes (20b) are provided on the sleeve (20). 10. The assembly and disassembly tool according to any one of claims 1-5, characterized in that an anti-slip structure (30a) is provided on the other side of the slip (30).