Polishing tool for flange sealing surface of pipeline

Abstract

A pipeline flange sealing surface polishing tool is characterized by comprising a positioning assembly which is suitable for being arranged in a pipeline and comprises an expansion mechanism (2), and the expansion mechanism (2) is used for expanding in the radial direction so as to abut against the inner wall of the pipeline, so that the positioning assembly is fixed in the pipeline in a non-rotating mode; the grinding assembly comprises a grinding clamp (4) used for bearing grinding materials and a rotating clamp (8) used for being connected with an external power tool, and the rotating clamp (8) is fixedly connected with the grinding clamp (4) so as to transmit torque; the rotary connecting mechanism (5) is used for rotatably connecting the grinding assembly to the positioning assembly; and when the positioning assembly is fixed in the pipeline, the polishing assembly can rotate relative to the positioning assembly and the pipeline by means of the rotary connecting mechanism (5).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline repair tools, and particularly relates to a polishing tool for a flange sealing surface of a pipeline. BACKGROUND

[0002] In the pipeline system in the fields of chemical industry and energy, the quality of the sealing surface of the pipeline flange is directly related to the sealing and safety of the whole system. During long-term use or maintenance, the sealing surface of the flange may have defects such as scratches and corrosion, and needs to be polished and repaired.

[0003] One of the existing polishing methods is to use a simple polishing tool. The tool usually includes a rotating clamp connected with a power tool and a positioning block used for positioning in the pipeline. However, this tool has obvious defects: first, in order to facilitate the positioning block to be inserted into the pipeline, the diameter thereof is usually smaller than the inner diameter of the pipeline, and the gap causes the tool to be unable to be accurately centered, and the tool is prone to shaking during polishing, which affects the polishing quality. Secondly, during the polishing process, the positioning block is rotated at high speed in the inner wall of the pipeline together with the rotating clamp, and the positioning block is subjected to severe friction with the pipe wall, which causes the positioning block to be rapidly worn, and reduces the service life and positioning accuracy of the tool.

[0004] Therefore, how to provide a flange sealing surface polishing tool with accurate positioning, stable work and small wear is a problem to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] The present application aims to overcome the deficiencies of the prior art, and provides a pipeline flange sealing surface polishing tool, which aims to solve the problems of inaccurate positioning, easy wear and poor polishing quality of the existing polishing tool.

[0006] The present application discloses a pipeline flange sealing surface polishing tool, characterized in that it comprises: a positioning assembly adapted to be placed inside a pipeline and comprising an expansion mechanism for expanding radially to abut against the inner wall of the pipeline, so as to non-rotatably fix the positioning assembly inside the pipeline; a polishing assembly comprising a polishing clamp for carrying polishing material and a rotating clamp for connecting an external power tool, the rotating clamp being fixedly connected with the polishing clamp to transmit torque; and a rotating connection mechanism for rotatably connecting the polishing assembly to the positioning assembly; wherein, when the positioning assembly is fixed inside the pipeline, the polishing assembly can rotate relative to the positioning assembly and the pipeline by means of the rotating connection mechanism.

[0007] According to an optional embodiment, the positioning assembly comprises a pull rod assembly and a centering sleeve sleeved on the pull rod assembly; an inner ring of the rotating connection mechanism is fixed to the outer periphery of the centering sleeve; and the polishing assembly is rotatably sleeved on the centering sleeve through the rotating connection mechanism.

[0008] According to an optional embodiment, the centering sleeve comprises a shaft portion for mounting the rotary connecting mechanism and a centering block connected to the shaft portion and having a tapered head portion; the expansion mechanism comprises a radially deformable cylindrical expansion sleeve for cooperating with the centering block; and the expansion sleeve has circumferentially distributed slits.

[0009] According to an optional embodiment, the pull rod assembly comprises a centering block and a gland connected to one end of the centering block; and the gland has a tapered head portion facing the centering block; wherein the expansion sleeve is forced to expand or contract radially by axially displacing the tapered head portion of the gland relative to the tapered head portion of the centering block.

[0010] According to an optional embodiment, the positioning assembly comprises a locking mechanism; and the locking mechanism is used to lock the axial relative displacement between the tapered head portion of the gland and the tapered head portion of the centering block.

[0011] According to an optional embodiment, the centering sleeve comprises a shaft portion for mounting the rotary connecting mechanism, a centering block sleeved on the shaft portion and having a tapered head portion, and a positioning plate arranged axially on one side of the centering block; and the expansion mechanism comprises a plurality of sliders slidable along the tapered head portion of the centering block; wherein the sliders are forced to expand or contract radially by obliquely displacing the sliders relative to the tapered head portion of the centering block.

[0012] According to an optional embodiment, the pull rod assembly comprises a centering block and a gland connected to one end of the centering block; and the gland abuts against the sliders to force the sliders to slide along the tapered head portion of the centering block by axially displacing the gland relative to the centering block, thereby expanding or contracting radially.

[0013] According to an optional embodiment, the positioning plate is fixed to the side of the centering block away from the gland, for axially limiting the sliders.

[0014] According to an optional embodiment, the centering sleeve comprises an adjustable fixing member and a spring; the adjustable fixing member is arranged between the centering block and the positioning plate, for adjusting the axial position of the positioning plate relative to the centering block; and the spring is arranged between the sliders and the positioning plate, to keep the tapered head portion of the centering block and the sliders abutting against each other.

[0015] According to an optional embodiment, the grinding assembly includes a bearing plate fixed on the grinding fixture and / or a grinding material plate disposed on the side of the grinding fixture near the tightening mechanism; the bearing plate is used to axially limit the rotary connection mechanism; and the grinding material plate is used to make the grinding material abut against the grinding fixture.

[0016] Compared with existing technologies, this application has the following advantages. The pipe flange sealing surface grinding tool of this application adopts a tension-type positioning component, which can tightly fit against the inner wall of the pipe without gaps, achieving precise centering and ensuring the stability of the grinding fixture during the grinding process, thereby guaranteeing the flatness of the flange sealing surface and the repair quality. The pipe flange sealing surface grinding tool of this application separates the positioning function from the grinding function. During operation, the positioning component remains stationary, and only the grinding component rotates. This completely avoids frictional wear between the positioning component and the inner wall of the pipe, greatly extending the overall service life of the tool. The pipe flange sealing surface grinding tool of this application can be quickly installed and locked, is easy to operate, and effectively prevents parts from accidentally falling into the pipe through various limiting components, improving the safety of on-site operations. The pipe flange sealing surface grinding tool of this application has a compact overall structure, is easy to manufacture and maintain, and can adapt to pipes with different inner diameters by changing expansion sleeves of different outer diameters, exhibiting good versatility. Attached Figure Description

[0017] In the following description, embodiments of the invention will be described in more detail with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a cross-sectional view of a pipe flange sealing surface grinding tool according to the first embodiment of this application.

[0019] Figure 2 yes Figure 1 A schematic diagram of the tool for grinding the sealing surface of a pipe flange.

[0020] Figure 3 This is a cross-sectional view of a pipe flange sealing surface grinding tool according to the second embodiment of this application.

[0021] Figure 4 yes Figure 3 A schematic diagram of the tool for grinding the sealing surface of a pipe flange.

[0022] Other objects and features of the embodiments described herein will become apparent from the following detailed description taken in conjunction with the accompanying drawings. However, it should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of this application. Detailed Implementation

[0023] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are illustrated, it is to be understood that the application is not limited to the embodiments described herein, but can be practiced with variation within the scope and spirit of the application. Rather, the embodiments are provided as exemplary of the application so as to convey the scope to those skilled in the art.

[0024] In the present application, the following terms have the following meanings unless explicitly stated otherwise. The term "relative displacement" refers to a motion or state in which the mutual position or distance between two or more components in the pipe flange sealing surface grinding tool is changed. The term "axial" refers to a direction along the central axis of the pipe flange sealing surface grinding tool. Movement or force parallel to this axis is referred to as axial movement or axial force. The term "radial" refers to a direction perpendicular to the central axis of the pipe flange sealing surface grinding tool and extending outward or inward. For example, the expansion or contraction of the expansion mechanism is a radial motion. The term "circumferential" refers to a circumferential direction around the central axis of the tool. For example, the cuts or the sliding blocks are distributed circumferentially. The term "oblique" refers to a direction having an acute angle with the central axis of the tool.

[0025] The pipe flange sealing surface grinding tool of the present application generally comprises a positioning assembly for fixing position inside the pipe, a grinding assembly for performing the grinding operation, and a rotating connection mechanism 5 (e.g. bearing) for enabling the grinding assembly to rotate relative to the positioning assembly.

[0026] Figure 1 And Figure 2 A pipe flange sealing surface grinding tool of a first embodiment of the present application is shown. The pipe flange sealing surface grinding tool comprises a positioning assembly and a grinding assembly. The positioning assembly is used to non-rotatably fix the tool inside the pipe, which comprises a pull rod assembly 1, an expansion mechanism 2, a centering sleeve 3, and a locking mechanism 6. The pull rod assembly 1 comprises a central pull rod 101, one end of which is connected with a gland 102 having a tapered head. The centering sleeve 3 is sleeved on the central pull rod 101, which comprises a shaft portion 301 for mounting a bearing and a centering block 302 also having a tapered head. In this embodiment, the expansion mechanism 2 is a cylindrical expansion sleeve 201. The expansion sleeve 201 is provided with a plurality of circumferential cuts (slit openings) to enable it to deform radially. As shown, the expansion sleeve 201 is arranged between the tapered head of the gland 102 and the tapered head of the centering block 302. The locking mechanism 6 in this embodiment can be a limiting nut, which is threadedly connected with the other end of the central pull rod 101 and abuts against the centering sleeve 3 to adjust the relative position of the centering sleeve 3 and the pull rod assembly 1, i.e. to adjust the outer diameter of the expansion mechanism 2. The positioning assembly is stationary relative to the pipe to be ground, completely avoiding friction and wear between the positioning assembly and the inner wall of the pipe, greatly prolonging the overall service life of the tool. Figure 2 ​

[0027] The polishing assembly is used for polishing the sealing surface of the flange, which comprises a polishing clamp 4 and a rotating clamp 8. The polishing clamp 4 is used for sticking or fixing the polishing materials such as sandpaper and sand cloth. The rotating clamp 8 is used for connecting the external power tool such as electric drill. The rotating clamp 8 is fixedly connected with the polishing clamp 4 (for example, through the positioning pin 7 or screw) to synchronously transmit the torque. The end of the rotating clamp 8 axially away from the polishing clamp 4 can be connected with the external power tool such as electric drill. The end of the rotating clamp 8 axially close to the polishing clamp 4 comprises a space for accommodating the limiting nut 6 and a connecting part for connecting the polishing clamp 4. The connecting part of the rotating clamp 8 is fixed to the polishing clamp 4 via the positioning pin 7. Specifically, the polishing clamp 4 is provided with a positioning hole at its planar end, and the rotating clamp 8 is also provided with a positioning hole at its connecting part. One part of the positioning pin 7 is arranged in the positioning hole of the polishing clamp 4, and the other part is arranged in the positioning hole of the rotating clamp 8. The rotation of the rotating clamp 8 can drive the polishing clamp 4 to rotate, and then drive the polishing materials such as sandpaper fixed on the conical surface of the polishing clamp 4 to rub with the pipeline to be polished, so as to polish.

[0028] The inner ring of the rotating connecting mechanism 5 (for example, bearing) is fixed on the shaft part 301 of the centering sleeve 3, and the outer ring is connected with the polishing assembly (specifically, the inner hole of the polishing clamp 4). In this way, the polishing assembly can be freely rotated around the stationary centering sleeve 3 through the rotating connecting mechanism 5. The end of the polishing clamp 4 facing the pipeline to be polished is a conical surface, and the opposite end is a planar surface. The polishing materials such as sandpaper and sand cloth can be fixed on the conical surface of the polishing clamp 4 by sticking or adsorbing. The center of the polishing clamp 4 is provided with a through hole, and the hollow shaft part of the centering sleeve 3 and the shaft part of the centering rod 1 sleeved in the hollow shaft part pass through the through hole of the polishing clamp 4. The outer diameter of the polishing clamp 4 is greater than the outer diameter of the pipeline to be polished. The outer diameter of the limiting nut 6 is greater than the inner diameter of the through hole of the polishing clamp 4. In this way, the centering rod 1, the expanding mechanism 2 and the centering sleeve 3 fixed together will not fall into the pipeline to be polished.

[0029] The working process of the pipeline flange sealing surface polishing tool according to the first embodiment of the present application is as follows.

[0030] The polishing clamp 4 is connected to the centering sleeve 3 through the rotary connecting mechanism 5. Then the assembled pull rod assembly 1, the expansion mechanism 2 and the centering sleeve 3 are inserted into the pipeline to be polished. The polishing clamp 4 is kept abutting against the end of the pipeline. The rotary limiting nut 6 is adjusted so that the pull rod assembly 1 and the centering sleeve 3 move axially towards each other. The taper head of the gland 102 of the pull rod assembly 1 and the taper head of the centering block 302 of the centering sleeve 3 jointly press the expansion mechanism 2, forcing it to expand radially, and its outer wall is thus tightly abutted against the inner wall of the pipeline to be polished. The relative position of the pull rod assembly 1 and the centering sleeve 3 is fixed, and thus the secure locking and accurate positioning of the pipeline flange sealing surface polishing tool are achieved. At this time, the positioning assembly is completely stationary relative to the pipeline to be polished.

[0031] The power tool is connected to the rotary clamp 8 and started. The power tool drives the rotary clamp 8, which drives the polishing clamp 4 and the polishing material thereon to rotate at high speed. Since the polishing clamp 4 is installed on the stationary centering sleeve 3 through the rotary connecting mechanism 5, it can rotate freely and smoothly around the axis of the pull rod assembly 1, and the flange surface of the pipeline is polished efficiently.

[0032] After polishing, the limiting nut 6 is adjusted and the polishing clamp 4 is pulled axially away from the pipeline, so that the pull rod assembly 1 and the centering sleeve 3 move axially in the opposite direction. The pressing force of the centering sleeve 3 on the expansion mechanism 2 disappears. The expansion mechanism 2 restores to the original diameter under the action of its own elasticity or gravity, and the pipeline flange sealing surface polishing tool can be easily taken out of the pipeline.

[0033] Referring to Figure 3 and Figure 4 , the second embodiment of the present application provides a pipeline flange sealing surface polishing tool. The structure of the positioning assembly and the rotary connecting mechanism 5 of the pipeline flange sealing surface polishing tool of the present embodiment is different from that of the first embodiment. The centering sleeve 3 of the present embodiment includes a shaft portion 301, a centering block 302 sleeved on the shaft portion 301 and having a taper head, a positioning plate 303 arranged axially on one side of the centering block 302, a spring 305, and an adjustable fixing member 304 (for example, an internal hexagonal screw) arranged between the centering block 302 and the positioning plate 303. The expansion mechanism 2 of the present embodiment includes a plurality of sliding blocks 202 which can slide along the taper head of the centering block 302. The adjustable fixing member 304 is used to adjust the axial position of the positioning plate 303 relative to the centering block 302. The spring 305 is used to keep the sliding blocks 202 and the taper head of the centering block 302 abutting against each other.

[0034] The positioning plate 303 is fixed to the end of the centering block 302 axially away from the gland 102 by the adjustable fixing 304. The distance between the positioning plate 303 and the sliding block 202 can be adjusted by the adjustable fixing 304. The end of the sliding block 202 axially away from the adjustable fixing 304 abuts against the gland 102. In other words, the sliding block 202 is clamped between the positioning plate 303 and the gland 102. The outer surface of the sliding block 202 is a cylindrical surface and has a T-shaped protrusion on the inner side in the radial direction to cooperate with the corresponding sliding groove on the centering block 302 to slide thereon. The tapered head of the centering block 302 causes the outer diameter of the expansion mechanism 2 to change when the sliding block 202 slides on the centering block 302. In the present embodiment, the centering rod 101 and the gland 102 are detachably fixedly connected by the locking mechanism 6. The locking mechanism 6 can be a limiting nut in the present embodiment, which is screwed with the end of the centering rod 101 passing through the gland 102. The other end of the centering rod 101 away from the gland 102 abuts against the centering sleeve 3. The axial movement of the centering rod 101 can adjust the relative position of the centering sleeve 3 and the gland 102 and drive the sliding block 202 to slide on the centering block 302, i.e. adjust the outer diameter of the expansion mechanism 2. The locking mechanism 6 is used to lock the axial position of the centering rod 101 after the adjustment is completed.

[0035] The number of the rotation connecting mechanisms 5 of the present embodiment is two, which is different from the one rotation connecting mechanism 5 of the first embodiment. The inner rings of the two rotation connecting mechanisms 5 are fixed on the shaft part 301 of the centering sleeve 3. The outer ring of one of the rotation connecting mechanisms 5 is fixed on the polishing clamp 4, and the outer ring of the other rotation connecting mechanism 5 is fixed on the rotating clamp 8. In this way, the polishing assembly (including the polishing clamp 4 and the rotating clamp 8) can freely rotate around the stationary centering sleeve 3 through the two rotation connecting mechanisms 5, providing more stable rotation support.

[0036] The pipe flange sealing surface polishing tool of the present embodiment further comprises a bearing pressing disc 10 arranged between the two rotation connecting mechanisms 5. The bearing pressing disc 10 is fixed to the polishing clamp 4 by self-tapping screws and is rotatably arranged on the centering sleeve 3 by a snap spring 306. The snap spring 306 is embedded in the snap spring groove on the outer periphery of the centering sleeve 3 to prevent the entire positioning assembly from being separated from the polishing assembly in the direction of the pipe. In addition to the limiting function, the bearing pressing disc 10 also acts as a vibration isolation member, which can be made of non-metallic materials (such as nylon, polytetrafluoroethylene) or metallic materials (such as copper, aluminum) with elasticity and wear resistance, to buffer and isolate vibrations. When the rotating clamp 8 rotates at high speed, the slight vibration of the rotating clamp 8 itself or transmitted by the power tool can be absorbed by the bearing pressing disc 10 to a certain extent, avoiding resonance or shaking caused by direct transmission of vibration, so as to ensure that the polishing clamp 4 can rotate more smoothly and improve the fineness of polishing.

[0037] The polishing material such as the sandpaper and the sand cloth of the present embodiment is fixed to the tapered surface of the polishing jig 4 by the polishing material pressure plate 401.

[0038] The working process of the pipe flange sealing surface polishing tool according to the second embodiment of the present application is similar to the first embodiment.

[0039] As used herein, the singular forms "a", "an" and "the" are to be construed as "at least one", thus also covering a plurality of identical items unless otherwise indicated herein. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including" when used herein, specify the presence of stated features, actions, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, actions, integers, steps, operations, elements, components, and / or groups thereof.

[0040] The specific embodiments described above are merely meant to describe the principles of the present application, in which the individual components are clearly shown or described so that the principles of the present application are more easily understood. Various modifications or changes can be easily made by those skilled in the art to the present application without departing from the scope of the present application, and such modifications or changes should be included in the patent protection scope of the present application.

Claims

1. A tool for grinding a sealing surface of a flange of a pipe, characterized in that, Comprise: a positioning assembly adapted to be placed inside a pipe and comprising an expanding mechanism (2) for radially expanding to abut against the inner wall of the pipe so as to non-rotationally fix the positioning assembly inside the pipe; a polishing assembly comprising a polishing clamp (4) for carrying polishing material and a rotating clamp (8) for connecting an external power tool, the rotating clamp (8) being fixedly connected with the polishing clamp (4) to transmit torque; and a rotating connecting mechanism (5) for rotatably connecting the polishing assembly to the positioning assembly; wherein, when the positioning assembly is fixed inside the pipe, the polishing assembly can rotate relative to the positioning assembly and the pipe by means of the rotating connecting mechanism (5).

2. The polishing tool according to claim 1, wherein the positioning assembly comprises a pull rod assembly (1) and a centering sleeve (3) sleeved on the pull rod assembly (1); an inner ring of the rotating connecting mechanism (5) is fixed to the outer periphery of the centering sleeve (3); and the polishing assembly is rotatably sleeved on the centering sleeve (3) through the rotating connecting mechanism (5).

3. The polishing tool according to claim 2, wherein the centering sleeve (3) comprises a shaft portion (301) for mounting the rotating connecting mechanism (5) and a centering block (302) connected to the shaft portion (301) and having a tapered head portion; the expanding mechanism (2) comprises a radially deformable cylindrical expansion sleeve (201) for cooperating with the centering block (302); and the expansion sleeve (201) has circumferentially distributed cutouts.

4. The polishing tool according to claim 3, wherein the pull rod assembly (1) comprises a central pull rod (101) and a gland (102) connected to one end of the central pull rod (101); and the gland (102) has a tapered head portion in the direction towards the centering block (302); wherein the expansion sleeve (201) is forced to radially expand or contract by axially relatively displacing the tapered head portion of the gland (102) and the tapered head portion of the centering block (302).

5. The polishing tool according to claim 4, wherein the positioning assembly comprises a locking mechanism (6); and the locking mechanism (6) is used to lock the axial relative displacement between the tapered head portion of the gland (102) and the tapered head portion of the centering block (302).

6. The polishing tool according to claim 2, wherein the centering sleeve (3) comprises a shaft portion (301) for mounting the rotating connecting mechanism (5), a centering block (302) sleeved on the shaft portion (301) and having a tapered head portion, and a positioning plate (303) disposed on one side of the centering block (302) in the axial direction; and the expanding mechanism (2) comprises a plurality of sliding blocks (202) that can slide along the tapered head portion of the centering block (302). Wherein, by making the slider (202) and the taper head of the centering block (302) obliquely relative displacement, the slider (202) is forced to expand or contract radially.

7. The polishing tool according to claim 6, wherein, The pull rod assembly (1) comprises a center pull rod (101) and a gland (102) connected to one end of the center pull rod (101); and The gland (102) abuts against the slider (202) to force the slider (202) to slide along the taper head of the centering block (302) by making the gland (102) and the centering block (302) axially relative displacement, thereby expanding or contracting radially.

8. The polishing tool according to claim 7, wherein, The positioning plate (303) is fixed to the side of the centering block (302) away from the gland (102) for axially limiting the slider (202).

9. The polishing tool according to claim 8, wherein, The centering sleeve (3) comprises an adjustable fixing member (304) and a spring (305); The adjustable fixing member (304) is arranged between the centering block (302) and the positioning plate (303) for adjusting the axial position of the positioning plate (303) relative to the centering block (302); and The spring (305) is arranged between the slider (202) and the positioning plate (303) to keep the slider (202) and the taper head of the centering block (302) abutting against each other.

10. The polishing tool according to claim 1, wherein, The polishing assembly comprises a bearing pressing plate (10) fixed on the polishing clamp (4) and / or a polishing material pressing plate (401) arranged on the side of the polishing clamp (4) close to the expansion mechanism (2); The bearing pressing plate (10) is used to axially limit the rotary connecting mechanism (5); and The polishing material pressing plate (401) is used to make the polishing material abut against the polishing clamp (4).

Images