Mechanical expansion pipe dismounting clamp and dismounting method

Abstract

The mechanical expansion pipe dismounting clamp comprises a limiting sleeve, a core shaft is coaxially arranged in the limiting sleeve, an extrusion part is arranged at one end of the core shaft, and extrusion conical surfaces with opposite inclination angles are arranged at the end, close to the core shaft, of the extrusion part and the end, away from the core shaft, of the extrusion part correspondingly; the extrusion part is coaxially sleeved with an expansion petal, the two ends of an inner hole of the expansion petal are provided with pressed conical surfaces corresponding to the two extrusion conical surfaces in a matched mode respectively, a limiting part is arranged between the pressed conical surfaces at the two ends, and the limiting part is in axial limiting clamping connection with the end of the limiting sleeve; the bidirectional internal expansion clamping device can meet the requirement of a narrow space, performs efficient and convenient bidirectional internal expansion clamping on a pipe fitting, and is wider in application scene and more convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe fixtures and relates to a mechanical pipe expansion and disassembly fixture and a disassembly method. Background Art

[0002] In order to meet the needs of product assembly and testing, more and more products need to install different bushing parts in the hole, and the product needs to be disassembled and assembled after the first assembly and testing to determine whether the parts of the product will be worn after operation. For example, various valve bodies, shells, and damper products have more complex parts assembly requirements inside, and all of them need to be disassembled and assembled after verification, which often directly affects the overall performance of the product.

[0003] At present, there are widely used hydraulic, pneumatic, and electric disassembly and assembly fixtures, such as pneumatic chucks, hydraulic shears, etc., which can meet the use conditions of many factories, but these require oil sources, air pumps and other equipment, which are no longer applicable to small batches or single products. These working methods cannot produce products efficiently. If pneumatic or hydraulic fixtures are developed and produced separately for these small batches of products, the production cost and time cost will be greatly increased. At the same time, the above-mentioned pneumatic chucks, hydraulic shears and other fixtures are external clamping structures, which require a large operating space and are difficult to apply in operating scenarios with narrow space.

[0004] There are also clamps that use internal expansion to clamp pipe fittings in the prior art, but the existing internal expansion pipe fitting clamps usually only meet the force requirements in one direction, that is, they only meet the requirements of pulling internal expansion or pushing internal expansion. When restricted by the operating environment and the force direction, the existing internal expansion clamps also have limitations in use.

[0005] Therefore, in view of the defects that the existing external clamping type fixture of pipe fittings cannot adapt to narrow spaces and the existing internal expansion type fixture of pipe fittings can only meet the force requirements in one direction, the present invention discloses a mechanical pipe expansion and disassembly fixture and a disassembly method. Summary of the invention

[0006] The purpose of the present invention is to provide a mechanical pipe expansion and disassembly clamp and disassembly method, which can adapt to the requirements of narrow spaces, perform efficient and convenient two-way internal expansion clamping on pipe fittings, have a wider range of applicable scenarios, and are more convenient to use.

[0007] The present invention is achieved through the following technical solutions:

[0008] A mechanical tube expansion and disassembly fixture comprises a limiting sleeve, wherein a core shaft is coaxially arranged inside the limiting sleeve, an extrusion piece is arranged at one end of the core shaft, and an extrusion piece is respectively arranged at an end of the extrusion piece close to the core shaft and an end of the extrusion piece far from the core shaft with extrusion cone surfaces having opposite inclination angles, an expansion flap is coaxially sleeved on the outside of the extrusion piece, and pressure cone surfaces are respectively arranged at two ends of the inner hole of the expansion flap corresponding to the two extrusion cone surfaces, a limiting portion is arranged between the pressure cone surfaces at both ends, and the limiting portion is axially limitedly engaged with the end of the limiting sleeve.

[0009] The mandrel is moved axially. When the mandrel moves axially toward a first direction, the extrusion cone at one end is driven to apply pressure to the pressure cone on the corresponding side, so that the expansion flaps are radially expanded to expand the inner wall of the pipe fitting, and then the limiting sleeve is pulled out for disassembly. When the mandrel moves toward a second direction opposite to the first direction, the extrusion cone at the other end is driven to apply pressure to the pressure cone on the corresponding side, so that the expansion flaps are also radially expanded to expand the pipe wall of the pipe fitting, and then the limiting sleeve can be pulled out for disassembly. Regardless of whether the axial driving force in the first direction or the second direction is applied to the mandrel, the expansion flaps can be radially expanded to tighten and fix the inner wall of the pipe fitting, thereby achieving bidirectional internal expansion clamping of the pipe fitting.

[0010] In order to better implement the present invention, further, the limiting part includes a limiting sleeve, expansion petals are arranged at both ends of the limiting sleeve, and a limiting groove is arranged on the outer surface of the limiting sleeve, and the limiting groove is axially limitedly engaged with the end of the limiting sleeve.

[0011] In order to better implement the present invention, further, a limiting ring is provided at the end of the limiting sleeve, and the limiting ring is axially limitedly engaged with the limiting groove.

[0012] In order to better implement the present invention, further, a hexagonal nut is coaxially fixedly provided on one end of the limiting sleeve away from the extrusion piece, and the core shaft is correspondingly threadedly matched with the threaded hole of the hexagonal nut.

[0013] In order to better implement the present invention, further, a gasket is provided between the hexagonal nut and the end of the limiting sleeve.

[0014] In order to better implement the present invention, further, a mounting pin perpendicular to the axis of the mandrel is provided at one end of the mandrel away from the extrusion piece.

[0015] In order to better implement the present invention, further, both ends of the extrusion piece are coaxially provided with blocking covers, and the blocking covers are provided with expansion guide grooves at positions corresponding to the expansion petals, and the expansion guide grooves are slidably connected with the expansion petals.

[0016] In order to better implement the present invention, further, the width of the expansion guide groove is greater than or equal to the width of the expansion flap.

[0017] A mechanical expansion pipe disassembly method is implemented based on a mechanical expansion pipe disassembly fixture, comprising the following steps:

[0018] Step 1: Install the mandrel coaxially into the interior of the limiting sleeve, connect the extrusion piece to one end of the mandrel, and thread a hexagonal nut on the outer side of the other end of the mandrel;

[0019] Step 2: sleeve an expansion flap on the outer side of the extrusion piece, and clamp the end of the limiting sleeve with the middle of the expansion flap through a limiting ring;

[0020] Step 3, inserting the expansion flap to a predetermined depth in the inner hole of the pipe fitting, driving the mandrel to move in the first axial direction or the second axial direction, so that the extrusion cone surface presses the pressure cone surface, forcing the expansion flap to expand in the inner hole of the pipe fitting, thereby achieving internal expansion clamping of the inner hole of the pipe fitting;

[0021] Step 4: Rotate the hexagonal nut so that the hexagonal nut contacts the end of the limiting ceramic sleeve to fix the mandrel and lock the internal expansion clamping state of the inner hole of the pipe.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] The present invention arranges extrusion cone surfaces with opposite inclination directions at both ends of the extrusion piece, so that when the core shaft drives the extrusion piece to move axially in both directions, the extrusion cone surface can be driven to extrude the pressure cone surfaces at both ends of the inner hole of the expansion valve, and then under the condition of bidirectional force, the radial expansion of the expansion valve can be used to firmly expand and clamp the inner wall of the pipe fitting. It is suitable for narrow spaces, has no restrictions on the direction of force application, and is more efficient and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a mechanical tube expansion and disassembly fixture;

[0025] Figure 2 It is a structural schematic diagram of an extruded part;

[0026] Figure 3 It is a schematic diagram of the structure of the expansion valve;

[0027] Figure 4 for Figure 1 A-direction view.

[0028] Among them: 1-limiting sleeve; 2-core shaft; 3-hexagonal nut; 4-gasket; 5-installation pin; 6-blocking cover; 11-limiting ring; 21-extrusion piece; 22-extrusion cone surface; 23-expansion petal; 24-pressure cone surface; 25-limiting sleeve; 61-expansion guide groove. DETAILED DESCRIPTION

[0029] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the present invention explicitly states otherwise, singular forms are also intended to include plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0032] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Embodiment 1:

[0034] A mechanical expansion and disassembly fixture of this embodiment, such as Figure 1 As shown, it includes a limiting sleeve 1, a core shaft 2 is coaxially arranged inside the limiting sleeve 1, an extrusion piece 21 is arranged at one end of the core shaft 2, and an extrusion piece 21 is respectively provided with an extrusion cone surface 22 with opposite inclination angles at one end close to the core shaft 2 and the end away from the core shaft 2, and an expansion flap 23 is coaxially sleeved outside the extrusion piece 21, and pressure cone surfaces 24 are respectively arranged at two ends of the inner hole of the expansion flap 23 corresponding to the two extrusion cone surfaces 22, and a limiting portion is arranged between the pressure cone surfaces 24 at both ends, and the limiting portion is axially limitedly engaged with the end of the limiting sleeve 1.

[0035] like Figure 1-Figure 3As shown, the horizontal left direction is the first direction, and the horizontal right direction is the second direction for explanation. An axial force in the first direction is applied to the mandrel 2 to drive the mandrel 2 to move axially to the left. When the mandrel 2 moves axially to the left, the extrusion cone 22 at the right end of the extrusion member 21 squeezes the pressure cone 24 at the inner hole of the right end of the expansion flap 23, thereby causing the right end of the expansion flap 23 to expand radially to expand and fix the inner tube wall of the pipe fitting. An axial force in the second direction is applied to the mandrel 2 to drive the mandrel 2 to move axially to the right. When the mandrel 2 moves axially to the right, the extrusion cone 22 at the left end of the extrusion member 21 squeezes the pressure cone 24 at the inner hole of the left end of the expansion flap 23, thereby causing the left end of the expansion flap 23 to expand radially to expand and fix the inner tube wall of the pipe fitting. Therefore, whether the axial force to the left or to the right is applied to the mandrel 2, the expansion flap 23 can be effectively driven to expand to expand and fix the inner tube wall of the pipe fitting, which can adapt to different usage scenarios.

[0036] Embodiment 2:

[0037] A mechanical expansion and disassembly fixture is improved on the basis of Example 1, such as Figure 1-Figure 3 As shown, the limiting portion includes a limiting sleeve 25, and expansion petals 23 are provided at both ends of the limiting sleeve 25. A limiting groove is provided on the outer surface of the limiting sleeve 25, and the limiting groove is axially limitedly engaged with the end of the limiting sleeve 1.

[0038] The limiting groove and the end of the limiting sleeve 1 are axially limited and clamped to prevent the expansion flap 23 from making a large axial movement and to prevent the expansion flap 23 from escaping from the inner hole of the pipe. At the same time, the limiting sleeve 25 limits the axial movement of the expansion flap 23 to ensure the stability of the radial expansion of the expansion flap 23.

[0039] Furthermore, a limiting ring 11 is provided at the end of the limiting sleeve 1, and the limiting ring 11 is axially limitedly engaged with the limiting groove. The limiting ring 11 is fixedly installed on the end of the limiting sleeve 1 by screws, and the limiting ring 11 is axially limitedly engaged with the limiting groove to limit the axial movement of the expansion valve 23.

[0040] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0041] Embodiment 3:

[0042] A mechanical expansion and disassembly fixture is improved on the basis of embodiment 1 or 2, such as Figure 1As shown, a hexagonal nut 3 is coaxially fixedly arranged at one end of the limiting sleeve 1 away from the extrusion piece 21, and the core shaft 2 is threadedly matched with the threaded hole of the hexagonal nut 3. The core shaft 2 is provided with an external thread on the outside, and the external thread is threadedly matched with the threaded hole of the hexagonal nut 3. Since the hexagonal nut 3 is fixedly installed at the end of the limiting sleeve 1, the core shaft 2 can be driven to move axially inside the limiting sleeve 1 by simply rotating the core shaft 2.

[0043] Furthermore, a gasket 4 is provided between the hexagonal nut 3 and the end of the limiting sleeve 1 , and the gasket 4 is provided to ensure that the hexagonal nut 3 and the end of the limiting sleeve 1 are tightly fitted to ensure the stability of the axial movement of the core shaft 2 .

[0044] Furthermore, a mounting hole perpendicular to the axis of the core shaft 2 is provided at one end of the core shaft 2 away from the extrusion piece 21, and a mounting pin 5 is inserted into the mounting hole. By rotating the mounting pin 5, the core shaft 2 can be driven to rotate easily and labor-savingly.

[0045] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.

[0046] Embodiment 4:

[0047] A mechanical expansion and disassembly fixture is improved on the basis of any one of embodiments 1-3, such as Figure 1 and Figure 4 As shown, both ends of the extrusion member 21 are coaxially provided with a blocking cover 6 , and the blocking cover 6 is provided with an expansion guide groove 61 at a position corresponding to the expansion flap 23 , and the expansion guide groove 61 is slidably connected with the expansion flap 23 .

[0048] The plugging cover 6 is fixedly installed on both ends of the extrusion piece 21 by slotted pan head screws. When the expansion flap 23 is radially expanded under pressure, the expansion flap 23 and the expansion guide groove 61 slide together to achieve guidance, ensuring that the expansion flap 23 can expand smoothly to expand the inner tube wall of the fixed pipe.

[0049] Furthermore, the width of the expansion guide groove 61 is greater than or equal to the width of the expansion flap 23 .

[0050] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.

[0051] Embodiment 5:

[0052] A mechanical expansion pipe disassembly method is implemented based on a mechanical expansion pipe disassembly fixture, comprising the following steps:

[0053] Step 1, coaxially install the core shaft 2 into the interior of the limiting sleeve 1, and connect the extrusion piece 21 to one end of the core shaft 2, and threadably sleeve the hexagonal nut 3 on the outer side of the other end of the core shaft 2;

[0054] Step 2: sleeve the expansion flap 23 on the outer side of the extrusion piece 21, and clamp the end of the limiting sleeve 1 with the middle of the expansion flap 23 through the limiting ring 11;

[0055] Step 3, insert the expansion flap 23 to a predetermined depth in the inner hole of the pipe fitting, drive the core shaft 2 to move in the first axial direction or the second axial direction, so that the extrusion cone surface 22 squeezes the pressure cone surface 24, and forces the expansion flap 23 to expand and open in the inner hole of the pipe fitting, thereby achieving internal expansion clamping of the inner hole of the pipe fitting;

[0056] Step 4, rotate the hexagonal nut 3 so that the hexagonal nut 3 contacts the end of the limiting ceramic sleeve 1, so as to fix the core shaft 2 and lock the internal expansion clamping state of the inner hole of the pipe.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A mechanical expansion and disassembly fixture, comprising a limiting sleeve (1), wherein a core shaft (2) is coaxially arranged inside the limiting sleeve (1), characterized in that: An extrusion piece (21) is provided at one end of the core shaft (2), and an expansion flap (23) is sleeved on the outside of the extrusion piece (21). When the core shaft (2) drives the extrusion piece (21) to move axially in a first direction or a second direction, the extrusion piece (21) squeezes the expansion flap (23), causing the expansion flap (23) to expand radially.

2. A mechanical tube expansion and disassembly fixture according to claim 1, characterized in that: The extrusion piece (21) is provided with an extrusion cone surface (22) with opposite inclination angles at one end close to the core shaft (2) and at the other end away from the core shaft (2), respectively; the outer coaxial sleeve of the extrusion piece (21) is provided with an expansion flap (23); the two ends of the inner hole of the expansion flap (23) are respectively provided with a pressure cone surface (24) corresponding to the two extrusion cone surfaces (22); a limiting portion is provided between the pressure cone surfaces (24) at the two ends; the limiting portion is axially limitedly engaged with the end of the limiting sleeve (1).

3. A mechanical tube expansion and disassembly fixture according to claim 3, characterized in that: The limiting portion comprises a limiting sleeve (25), expansion flaps (23) are arranged at both ends of the limiting sleeve (25), and a limiting groove is arranged on the outer surface of the limiting sleeve (25), and the limiting groove is axially limitedly engaged with the end of the limiting sleeve (1).

4. A mechanical tube expansion and disassembly fixture according to claim 3, characterized in that: A limiting ring (11) is provided at the end of the limiting sleeve (1), and the limiting ring (11) is axially limitedly engaged with the limiting groove.

5. A mechanical tube expansion and disassembly fixture according to any one of claims 1 to 4, characterized in that: A hexagonal nut (3) is coaxially fixedly arranged at one end of the limiting sleeve (1) away from the extrusion piece (21), and the core shaft (2) and the threaded hole of the hexagonal nut (3) are correspondingly threadedly matched.

6. A mechanical tube expansion and disassembly fixture according to claim 5, characterized in that: A gasket (4) is provided between the hexagonal nut (3) and the end of the limiting sleeve (1).

7. A mechanical tube expansion and disassembly fixture according to claim 6, characterized in that: An installation pin (5) perpendicular to the axis of the core shaft (2) is provided at one end of the core shaft (2) away from the extrusion piece (21).

8. A mechanical tube expansion and disassembly fixture according to any one of claims 1 to 4, characterized in that: Both ends of the extrusion piece (21) are coaxially provided with blocking covers (6), and the blocking covers (6) are provided with expansion guide grooves (61) at positions corresponding to the expansion flaps (23), and the expansion guide grooves (61) are connected to the expansion flaps (23) in a sliding manner.

9. A mechanical expansion and disassembly method, implemented based on the mechanical expansion and disassembly fixture according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, coaxially install the core shaft (2) into the interior of the limiting sleeve (1), connect the extrusion piece (21) to one end of the core shaft (2), and threadably sleeve a hexagonal nut (3) on the outer side of the other end of the core shaft (2); Step 2: sleeve an expansion flap (23) on the outer side of the extrusion piece (21), and clamp the end of the limiting sleeve (1) with the middle of the expansion flap (23) through the limiting ring (11); Step 3, inserting the expansion flap (23) into the inner hole of the pipe to a predetermined depth, driving the core shaft (2) to move in the first axial direction or the second axial direction, so that the extrusion cone surface (22) presses the pressure cone surface (24), forcing the expansion flap (23) to expand and open in the inner hole of the pipe, thereby achieving internal expansion clamping of the inner hole of the pipe; Step 4: rotate the hexagonal nut (3) so that the hexagonal nut (3) contacts the end of the limiting ceramic sleeve (1) to fix the core shaft (2) and lock the internal expansion clamping state of the inner hole of the pipe.

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