Branch pipe fillet weld back face grinding and polishing tool

Abstract

The utility model relates to a grinding and polishing tool, and aims to provide a grinding and polishing tool for the back surface of a fillet weld of a branch pipe, which can be used for simply and quickly grinding and polishing so as to improve the working efficiency and reduce the production cost. According to the technical scheme, the grinding and polishing tool for the back face of the fillet weld of the branch pipe is characterized by comprising a circular fixing plate horizontally fixed to an external flange of the branch pipe through a screw assembly and a polishing assembly rotationally positioned on the circular fixing plate and driven by an electric drill; the polishing assembly comprises two main rods which are symmetrically arranged, polishing wheels which are fixed to the bottom ends of the main rods one by one and have upward working faces, and a main rod connector which is clamped and fixed to the top ends of the two main rods and transmits the torque of the electric drill, wherein the middles of the two main rods are connected into a whole through a hinge shaft.

Description

Technical Field

[0001] The utility model relates to a grinding and polishing tool, in particular to a grinding and polishing tool for the back of the fillet weld of a branch pipe. Background Art

[0002] In a pipeline system, the pipelines are divided into a main pipeline for transporting a medium and some branch pipes branched from the main pipeline. The branch pipes and the main pipe are mainly connected by fillet welds. When welding such fillet welds, if the protection is insufficient, residues such as oxidation and slag will appear at the connection part between the inner wall of the main pipe and the branch pipe. When there are high requirements for the pipeline system, these residues must be removed by grinding and polishing. As Figure 8 shown: A branch pipe interface is provided on a longer main pipe 1, a branch pipe 2 is welded on the branch pipe interface, a branch pipe external flange 4 is welded at the top end of the branch pipe, and there is a fillet weld 3 after welding between the branch pipe and the main pipe; the back of the fillet weld (i.e., the connection part between the inner wall of the main pipe and the branch pipe) needs to be ground and polished. When the sizes of both the main pipe and the branch pipe are small, neither personnel nor ordinary grinding tools can enter the main pipe for operation, and only the branch pipe can be cut off, and then re-piped and welded after grinding and polishing; a large amount of manpower and material resources are wasted. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the above background art and provide a grinding and polishing tool for the back of the fillet weld of a branch pipe, which should be able to perform grinding and polishing operations simply and quickly, thereby improving work efficiency and reducing production costs.

[0004] The technical solution provided by the utility model is as follows:

[0005] A grinding and polishing tool for the back of the fillet weld of a branch pipe, characterized in that: the tool includes a circular fixing plate horizontally fixed on the branch pipe external flange through a screw component and a polishing component rotatably positioned on the circular fixing plate and driven by an electric drill; the polishing component includes two main rods symmetrically arranged and integrally connected by a hinge shaft in the middle, polishing wheels fixed to the bottom ends of the main rods with the working surfaces facing upwards, and a main rod connecting head clamped and fixed to the top ends of the two main rods and transmitting the torque of the electric drill.

[0006] Fixing holes for fixedly connecting the two main rods and hinge holes for hinging the two main rods are respectively provided at the top and middle parts of the main rods; the connection line between the fixing hole and the hinge hole forms an angle with the axis of the lower half of the main rod, so that when the tops of the two main rods coincide, the polishing wheels at the bottoms of the two main rods can be mutually separated to meet the grinding requirements.

[0007] Bearings are provided between the two main rods and the circular fixing plate, and the outer rings of the bearings are positioned in the openings in the center of the circular fixing plate and welded and fixed to the circular fixing plate.

[0008] The cross section of the main rod is semicircular, and the two main rods overlap to form a circle that fits the inner ring of the bearing; after the hinge shaft is inserted into the hinge holes of the two main rods, the two ends are respectively welded and fixed to the inner ring of the bearing.

[0009] The polishing wheel comprises a semicircular bottom plate which is fixed at the bottom end of the main rod and has an opening facing upward, and polishing steel wires which are spread over and fixed on the inner surface of the semicircular bottom plate.

[0010] An opening for positioning the two main rods is provided in the center of the circular fixing plate, and a plurality of mounting holes for inserting the positioning screw assembly are provided around the circular fixing plate; the positions of the plurality of mounting holes correspond one to one with the positions of the fixing holes on the branch pipe external flange, so as to realize the connection between the fixing plate and the branch pipe external flange through the screw assembly.

[0011] One end of the main rod connector is a sleeve that is inserted and matched with the two overlapped main rods, and the other end is a polygonal column that is matched with the electric drill chuck.

[0012] The sleeve is provided with a radial through hole, and a locking pin is inserted through the through hole and the fixing hole of the main rod, and the two ends are fixed by nuts.

[0013] The screw rod assembly comprises a screw rod and two adjusting nuts and two locking nuts arranged on the screw rod.

[0014] The beneficial effect of the utility model is that the provided tool can quickly and effectively clean the residual impurities at the connection between the inner wall of the main pipe and the branch pipe without the need for repeated labor of cutting the branch pipe, thereby significantly improving production efficiency, saving a lot of manpower and material resources, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of an embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of the main structure of the main rod in the embodiment of the utility model.

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the main rod in the embodiment of the utility model.

[0018] Figure 4 It is a schematic diagram of the three-dimensional structure of the main rod connecting head in the embodiment of the utility model.

[0019] Figure 5 It is a schematic diagram of the connection relationship between the two main rods and the circular fixing plate in the embodiment of the utility model.

[0020] Figure 6 This is a schematic diagram of the installation structure of an embodiment of the utility model before grinding and polishing.

[0021] Figure 7 This is a schematic diagram of the working position of the embodiment of the present utility model during grinding and polishing.

[0022] Figure 8 This is a schematic diagram of the welding position of the main pipe and the branch pipe.

[0023] Reference numerals in the figure: main pipe 1, branch pipe interface 2, fillet weld 3, external flange of the branch pipe 4, circular fixing plate 5, bearing 6, polishing assembly 7, main rod 7-1, fixing hole 7-11, hinge hole 7-12, polishing wheel 7-2, hinge shaft 8, screw 9, adjusting nut 10, locking nut 11, main rod connector 12, locking pin 13. Specific embodiments

[0024] The following further detailed description is made in conjunction with the embodiments shown in the drawings.

[0025] The grinding and polishing tool for the back of the fillet weld of the branch pipe shown in the drawings includes a horizontally arranged circular fixing plate 5, a screw component for fixing the circular fixing plate on the external flange 4 of the branch pipe, a polishing assembly 7 rotatably positioned on the circular fixing plate, and an electric drill (i.e., a hand-held electric drill, omitted in the figure) for driving the polishing assembly; the polishing assembly includes two main rods 7-1 symmetrically arranged and integrally connected by a hinge shaft in the middle, and a polishing wheel 7-2 (the working surface of the polishing wheel faces upward) is fixed at the bottom end of each main rod, and the main rod connector 12 clamps and fixes the top ends of the two main rods and transmits the torque of the electric drill.

[0026] The screw component includes a screw 9 and two adjusting nuts 10 and two locking nuts 11 arranged on the screw.

[0027] An opening for positioning the two main rods is provided in the center of the circular fixing plate, and a plurality of mounting holes for inserting and positioning the screw component are provided on the periphery of the circular fixing plate; the positions of the plurality of mounting holes correspond one by one to the positions of the fixing holes on the external flange of the branch pipe. After both ends of each screw are inserted into the mounting holes and the fixing holes, the screw is fixed on the external flange of the branch pipe with two locking nuts, and the circular fixing plate is fixed on the screw with two adjusting nuts.

[0028] The polishing wheel (prior art) includes a semi-circular chassis fixed at the bottom end of the main rod and opening upward, and polishing wires densely distributed and fixed on the inner surface of the semi-circular chassis.

[0029] A fixing hole 7-11 for fixedly connecting two main rods is formed at the top of the main rod, and a hinge hole 7-12 for hinging two main rods is formed in the middle of the main rod and is hinged with a hinge shaft 8; the connection line between the fixing hole and the hinge hole is deflected by a certain angle A (this angle is determined as required) from the axis of the lower half of the main rod; thus, when the tops of the two main rods coincide, the two main rods can rotate axially around the hinge hole, so that the polishing wheels at the bottoms of the two main rods can be separated from each other by a certain distance to align with the polishing position and meet the polishing requirements.

[0030] Bearings 6 are arranged between the two main rods and the circular fixing plate, and the outer rings of the bearings are positioned in the openings in the center of the circular fixing plate and are welded and fixed with the circular fixing plate (usually spot welding is sufficient).

[0031] Further, the cross-section of the main rod is semi-circular, and the two main rods are exactly spliced into a circle suitable for the inner ring of the bearing after overlapping, so that they can be inserted into the inner ring of the bearing; both ends of the hinge shaft in the hinge holes of the two main rods are welded and fixed with the inner ring of the bearing.

[0032] One end of the main rod connector is a sleeve, and the inner diameter of the sleeve is suitable for the two overlapped main rods, so it can be inserted and matched with the two main rods; the other end of the main rod connector is a polygonal column head (preferably a hexagonal column head) that matches the drill chuck to facilitate the clamping cooperation with the drill chuck.

[0033] A radially penetrating through-hole is formed in the sleeve, and another locking pin 8 (threads are made at both ends of the locking pin and corresponding nuts are provided) is inserted through the through-hole and the fixing holes on the two main rods, and after tightening the nuts, the main rod connector and the main rod are connected into one body.

[0034] The working principle of the present utility model is:

[0035] 1. Assemble the polishing assembly; symmetrically arrange the two main rods 7-1, insert the hinge shaft 8 into the hinge hole, then insert it into the inner ring of the bearing 6, and then spot-weld both ends of the hinge shaft 8 to the inner ring of the bearing; then place the bearing into the opening of the circular fixing plate and connect the outer ring of the bearing to the circular fixing plate by spot welding; ensure that the two main rods 7-1 can freely rotate around the axis of the circular fixing plate; see Figure 6 .

[0036] 2. Place the polishing assembly into the branch pipe that needs to be used, and then use the screw assembly to fixedly connect the circular fixing plate and the external flange of the branch pipe; after both ends of each screw are inserted into the installation hole of the circular fixing plate and the fixing hole of the corresponding external flange of the branch pipe, then use two locking nuts to fix the screw on the external flange of the branch pipe, and use two adjusting nuts to fix the circular fixing plate on the screw; see Figure 6 .

[0037] 3. Pull the upper end of the main rod to make the upper ends of the two main rods coincide and the lower ends separate, so that the polishing wheel at the bottom of the main rod reaches the part to be polished at the bottom of the branch pipe 2; then insert the tops of the two main rods into the sleeve of the main rod connector 12, and after inserting the locking pin 13 into the fixing holes of the two main rods and the through holes on the sleeve, tighten the nuts at both ends of the locking pin to lock the main rod connector at the top of the main rod; see Figure 6 。

[0038] 4. Adjust the height of the locking nut 5 so that the polishing wheel fits against the reverse side of the weld seam 3 of the branch pipe and forms a certain pressing force.

[0039] 5. Clamp the hexagonal head of the main rod connector with the chuck of the electric drill, then start the electric drill to drive the main rod to rotate, and the polishing operation on the reverse side of the weld seam 3 can be carried out.

[0040] 6. After the polishing is completed, remove the locking nut on the screw rod assembly, and the utility model can be detached from the external flange of the branch pipe.

Claims

1. A tool for grinding and polishing the back of a branch pipe fillet weld, characterized in that: The tool comprises a circular fixing plate (5) horizontally fixed to a branch pipe external flange (4) via a screw assembly, and a polishing assembly (7) rotatably positioned on the circular fixing plate and driven by an electric drill; the polishing assembly comprises two main rods (7-1) symmetrically arranged and connected as a whole via a hinge shaft in the middle, polishing wheels (7-2) fixed one by one to the bottom ends of the main rods with their working surfaces facing upward, and a main rod connector (12) clamped and fixed to the top ends of the two main rods and transmitting the torque of the electric drill; The top and middle of the main rod are respectively provided with a fixing hole (7-11) for fixing and connecting the two main rods and a hinge hole (7-12) for hingedly connecting the two main rods; the connecting line between the fixing hole and the hinge hole forms an angle with the axis of the lower half of the main rod, so that when the tops of the two main rods overlap, the polishing wheels at the bottoms of the two main rods can diverge from each other, thereby meeting the grinding requirements; A bearing (6) is arranged between the two main rods and the circular fixing plate, and the outer ring of the bearing is positioned in the opening in the center of the circular fixing plate and is fixed to the circular fixing plate by welding; The cross section of the main rod is semicircular, and the two main rods overlap to form a circle that fits the inner ring of the bearing; after the hinge shaft is inserted into the hinge holes of the two main rods, the two ends are respectively welded and fixed to the inner ring of the bearing.

2. The back grinding and polishing tool for the corner weld of a branch pipe according to claim 1, characterized in that: The polishing wheel comprises a semicircular bottom plate which is fixed at the bottom end of the main rod and has an opening facing upward, and polishing steel wires which are spread over and fixed on the inner surface of the semicircular bottom plate.

3. The back grinding and polishing tool for the fillet weld of a branch pipe according to claim 2, characterized in that: An opening for positioning the two main rods is provided in the center of the circular fixing plate, and a plurality of mounting holes for inserting the positioning screw assembly are provided around the circular fixing plate; the positions of the plurality of mounting holes correspond one to one with the positions of the fixing holes on the branch pipe external flange; the connection between the fixing plate and the branch pipe external flange is achieved through the screw assembly.

4. The back grinding and polishing tool for the fillet weld of a branch pipe according to claim 3, characterized in that: One end of the main rod connector is a sleeve that is inserted and matched with the two overlapped main rods, and the other end is a polygonal column that is matched with the electric drill chuck.

5. The back grinding and polishing tool for the fillet weld of a branch pipe according to claim 4, characterized in that: The sleeve is provided with a radially penetrating through hole, and a locking pin (13) is inserted through the through hole and the fixing hole of the main rod, and the two ends are fixed by nuts.

6. The back grinding and polishing tool for the fillet weld of a branch pipe according to claim 5, characterized in that: The screw rod assembly comprises a screw rod and two adjusting nuts (10) and two locking nuts (11) arranged on the screw rod.

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