Grinding tool for sealing surface of high-pressure pipe

Abstract

The utility model discloses a high-pressure pipe sealing face grinding tool which comprises an abrasive paper supporting plate and a gland, the front face of the abrasive paper supporting plate is a conical inclined face used for containing abrasive paper, the conical clamping angle of the conical inclined face is matched with the conical inclined face of a ground pipe opening, and the gland is provided with an inwards-concave conical inclined face corresponding to the conical inclined face. Abrasive paper is buckled and compacted by the gland at the center of the front face of the abrasive paper supporting plate through the bolt, a prismatic hole is formed in the center of the abrasive paper supporting plate, a prismatic column is inserted into the prismatic hole from the back face of the abrasive paper supporting plate, and the bolt is screwed into the prismatic column to buckle and compact the abrasive paper and fix the prismatic column in the abrasive paper supporting plate at the same time. The prismatic column is provided with a protruding rotating connecting rod on the back side of the abrasive paper supporting plate, the rotating connecting rod is used for being connected with a pistol drill, and during grinding, the pistol drill drives the abrasive paper supporting plate to rotate through the prismatic column to achieve grinding of the pipe orifice. The tool guarantees the grinding quality of the sealing face, meanwhile, the force used by a worker for lifting the pistol drill can be reduced, and the labor intensity is reduced.

Description

Technical Field

[0001] The utility model relates to a high-pressure pipe sealing surface grinding tool. Background Art

[0002] The high-pressure and ultra-high-pressure pipelines in LDPE / EVA (high-pressure polyethylene / ethylene-vinyl acetate copolymer) devices are connected in the form of threaded flanges and lens pads. The lens pad sealing surface is a spherical surface, which abuts against the inner conical sealing surface set at a standard angle on the pipeline. In the initial state, the pipeline sealing surface and the lens pad sealing surface are in annular contact. Under the action of the bolt preload, the annular contact becomes annular contact, achieving good sealing.

[0003] Due to the characteristics of high temperature, high pressure and pressure pulsation of the device, the requirements for the pipeline sealing surface are relatively high. The quality of the pipeline sealing surface directly affects the sealing performance of the pipeline connection, and the surface roughness of the sealing surface is usually above Ra. When installing a new pipeline or replacing the lens pad during the maintenance of an existing pipeline, in order to ensure good sealing performance, the pipeline sealing surface needs to be ground. However, the traditional grinding method is mostly manual grinding with sandpaper, which has low grinding efficiency and grinding accuracy.

[0004] Therefore, it is necessary to provide a high-pressure pipe sealing surface grinding tool to solve the above technical problems. Summary of the invention

[0005] In view of the above problems, the purpose of the utility model is to provide a high-pressure pipe sealing surface grinding tool.

[0006] In order to achieve the above purpose, the solution of the utility model is:

[0007] A high-pressure pipe sealing surface grinding tool comprises a sandpaper supporting plate and a pressure cover, wherein the front side of the sandpaper supporting plate is a conical inclined surface for placing sandpaper, the conical inclined surface of the sandpaper supporting plate matches the conical inclined surface of the pipe mouth to be ground, the pressure cover is provided with a concave conical inclined surface corresponding to the conical inclined surface, and the pressure cover holds and compacts the sandpaper through bolts at the center of the front side of the sandpaper supporting plate, wherein: a prismatic hole is provided at the center of the sandpaper supporting plate, a prismatic column is inserted into the prismatic hole from the back side of the sandpaper supporting plate, the bolt is screwed into the prismatic column, and the prismatic column is fixed in the sandpaper supporting plate while holding and compacting the sandpaper, the prismatic column is provided with a raised rotating connecting rod on the back side of the sandpaper supporting plate, the rotating connecting rod is used to connect with a pistol drill, and during grinding, the sandpaper supporting plate is driven to rotate by the pistol drill through the prismatic column to grind the pipe mouth.

[0008] A further solution is that the concave conical slope of the gland has a conical angle that is at least 1 degree smaller than the conical angle of the conical slope of the sandpaper support plate.

[0009] A further solution is that the prismatic column is a hexagonal prismatic column.

[0010] The scheme is further as follows: a lifting assembly is arranged in the grinded pipe mouth, the lifting assembly includes a fixed outer ring and a rotating inner ring, the rotating inner ring is nested with the fixed outer ring, the rotating inner ring can rotate in the fixed outer ring, three pneumatic telescopic rods are arranged on the outer circular side wall of the fixed outer ring at an angle of 120 degrees perpendicular to the outer circular side wall, an air circuit is arranged in the fixed outer ring, an air circuit interface is arranged on the fixed outer ring, the air circuit interface is used to connect a pressure air source, at least three lifting holes distributed at an angle of 120 degrees are arranged on the rotating inner ring, and a lifting rod corresponding to the lifting holes is arranged on the pressure cover; when grinding, the lifting assembly is placed in the grinded pipe mouth, the pressure air is input to push the pneumatic telescopic rod to extend and press against the inner wall of the grinded pipe mouth to position and fix the fixed outer ring, the lifting rod on the pressure cover is inserted into the lifting hole, and the pistol drill is started to drive the sandpaper support plate to rotate to grind the pipe mouth.

[0011] The scheme is further as follows: an arc-shaped shoe plate is arranged at the top end of the pneumatic telescopic rod, a rubber pad is attached to the arc-shaped shoe plate, and the telescopic rod is extended through the arc-shaped shoe plate to press against the inner wall of the grinded pipe mouth to position and fix the fixed outer ring.

[0012] A further solution is: a limit stopper is provided on the lifting rod.

[0013] Compared with the related art, the high-pressure pipe sealing surface grinding tool provided by the utility model has the following beneficial effects:

[0014] (1) When grinding the sealing surface of a high-pressure pipe, the pistol drill drives the insert to rotate, and the support plate rotates under the drive of the insert, so that the sandpaper installed on the support plate grinds the sealing surface of the high-pressure pipe. The grinding efficiency and accuracy are high, and the required pipeline sealing surface accuracy is achieved, so that the sealing surface has no obvious radial or circumferential scratches visible to the naked eye, and the sealing surface feels smooth when touched by the fingertips. At the same time, it is easy to carry and reduces geographical restrictions.

[0015] (2) The lifting assembly in this tool is used to lift the support plate and the gland to ensure that the sandpaper grinding track can coincide with the sealing surface of the high-pressure pipe, thereby ensuring the grinding quality of the sealing surface. At the same time, it can also reduce the force used by personnel to lift the pistol drill and reduce labor intensity.

[0016] The utility model is described in detail below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure decomposition of the utility model;

[0019] Figure 3 This is a schematic diagram of the grinding state of the utility model with a lifting assembly;

[0020] Figure 4 This is a schematic diagram of the structure of the lifting assembly of the utility model;

[0021] Figure 5 This is a schematic diagram of the structural breakdown of a high-pressure pipe sealing surface grinding tool with a lifting assembly. DETAILED DESCRIPTION

[0022] A high pressure pipe sealing surface grinding tool, such as Figures 1 to 5 As shown, the tool includes a sandpaper support plate 1 and a pressure cover 2. The front side of the sandpaper support plate 1 is a conical inclined surface 101 for placing sandpaper. The conical inclined surface of the sandpaper support plate matches the conical inclined surface of the tube mouth of the grinded tube 3. The pressure cover 2 is provided with a concave conical inclined surface 201 corresponding to the conical inclined surface. The pressure cover 2 holds and compacts the sandpaper at the center of the front side of the sandpaper support plate through a bolt 4, wherein: a prismatic hole is provided in the center of the sandpaper support plate, and a prismatic column 5 is inserted into the prismatic hole from the back side of the sandpaper support plate. The bolt 4 is screwed into the prismatic column 5 to fix the prismatic column 5 in the sandpaper support plate 1 while holding and compacting the sandpaper. The prismatic column 5 is provided with a raised rotating connecting rod 501 on the back side of the sandpaper support plate. The rotating connecting rod 501 is used to connect with a pistol drill (not shown). During grinding, the pistol drill drives the sandpaper support plate 1 to rotate through the prismatic column 5 to grind the tube mouth of the grinding tube 3. The grinding efficiency and accuracy are improved to achieve the required pipeline sealing surface accuracy, so that there are no obvious radial or circumferential scratches on the sealing surface visible to the naked eye, and the sealing surface feels smooth when touched by the fingertips. At the same time, the tool is easy to carry, reducing geographical restrictions.

[0023] In order to compact the sandpaper better: the concave conical slope 201 of the pressure cover 2 has a conical angle at least 1 degree smaller than the conical slope 101 of the sandpaper support plate 1. In the embodiment: the prismatic column is a hexagonal prismatic column, so that the pistol drill can stably drive the sandpaper support plate 1 to rotate.

[0024] During use, the sandpaper support plate 1 and the pressure cover 2 will select sandpaper support plates 1 and pressure covers 2 of different diameters according to the diameters of the tube 3 to be grinded. However, when the diameter of the tube 3 to be grinded is large, for example, greater than 100 mm, the handheld sandpaper support plate 1 will be unstable when grinding the sealing surface. When a person lifts a pistol drill and grinds it, the pistol drill will inevitably shake, which will cause damage to the sealing surface and affect the grinding. In order to avoid the above situation, a lifting component 6 is provided in the grinded tube mouth. The lifting component 6 includes a fixed outer ring 601 and a rotating inner ring 602. The rotating inner ring is arranged to be sleeved with the fixed outer ring through a bearing (not shown in the figure). The rotating inner ring 602 can rotate in the fixed outer ring 601 through the bearing. A 120-degree angle perpendicular to the outer circular side wall of the fixed outer ring 601 is provided. Three pneumatic telescopic rods 603 are driven to extend and retract by the cylinders arranged in the outer circular side wall. An air path is arranged in the fixed outer ring 601, and the air path is connected to the cylinder. An air path interface 604 is arranged on the fixed outer ring 601, and the air path interface 604 is used to connect the pressure air source. At least three lifting holes 605 distributed at an angle of 120 are arranged on the rotating inner ring, and a lifting rod 202 corresponding to the lifting holes is arranged on the gland 2; a limit stop 203 is arranged on the lifting rod 202 for positioning the lifting rod 202. When grinding, Figure 3 As shown, the lifting assembly 6 is placed in the pipe mouth of the grinded pipe 3, and the input pressure gas pushes the pneumatic telescopic rod 603 to extend and press against the inner wall of the pipe mouth of the grinded pipe 3 to position and fix the fixed outer ring 601, and the lifting rod 202 on the gland 2 is inserted into the lifting hole 605, and the pistol drill is started to drive the sandpaper support plate 1 to rotate to grind the pipe mouth. In order to increase the contact area and make the fixed outer ring 601 firmly positioned, an arc-shaped boot plate 606 is provided at the top of the pneumatic telescopic rod, and a rubber pad is attached to the arc-shaped boot plate 606 to prevent slipping. The telescopic rod 603 extends through the arc-shaped boot plate 606 and presses against the inner wall of the grinded pipe mouth to position and fix the fixed outer ring. The setting of the lifting assembly 6 can reduce the force used by personnel to lift the pistol drill, reduce labor intensity, and ensure the grinding quality of the sealing surface.

[0025] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-pressure pipe sealing surface grinding tool, comprising a sandpaper support plate and a gland, the front of the sandpaper support plate is a conical slope for placing sandpaper, the conical slope of the sandpaper support plate matches the conical slope of the pipe mouth to be ground, the gland is provided with a concave conical slope corresponding to the conical slope, the gland is buckled and compacted by bolts at the center of the front of the sandpaper support plate, characterized in that: A prismatic hole is provided in the center of the sandpaper support plate, and a prismatic column is inserted into the prismatic hole from the back side of the sandpaper support plate. The bolt is screwed into the prismatic column to fix the prismatic column in the sandpaper support plate while holding and compacting the sandpaper. The prismatic column is provided with a raised rotating connecting rod on the back side of the sandpaper support plate, and the rotating connecting rod is used to connect with a pistol drill. During grinding, the pistol drill drives the sandpaper support plate to rotate through the prismatic column to achieve grinding of the pipe mouth.

2. The grinding tool according to claim 1, characterized in that: The conical angle of the inner concave conical slope of the pressure cap is at least 1 degree smaller than the conical angle of the conical slope of the sandpaper support plate.

3. The grinding tool according to claim 1, characterized in that: The prismatic columns are hexagonal prismatic columns.

4. The grinding tool according to claim 1, characterized in that: A lifting assembly is arranged in the grinded pipe mouth, and the lifting assembly includes a fixed outer ring and a rotating inner ring. The rotating inner ring is arranged in a nested manner with the fixed outer ring, and the rotating inner ring can rotate in the fixed outer ring. Three pneumatic telescopic rods are arranged on the outer circular side wall of the fixed outer ring at an angle of 120 degrees and perpendicular to the outer circular side wall. An air circuit is arranged in the fixed outer ring, and an air circuit interface is arranged on the fixed outer ring. The air circuit interface is used to connect a pressure air source. At least three lifting holes distributed at an angle of 120 degrees are arranged on the rotating inner ring, and lifting rods corresponding to the lifting holes are arranged on the pressure cover.

5. The grinding tool according to claim 4, characterized in that: An arc-shaped shoe plate is arranged at the top end of the pneumatic telescopic rod, and a rubber pad is attached to the arc-shaped shoe plate. The telescopic rod is extended through the arc-shaped shoe plate and pressed against the inner wall of the grinded pipe mouth to position and fix the fixed outer ring.

6. The grinding tool according to claim 4, characterized in that: A limit stopper is arranged on the lifting rod.

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