Precise steel pipe welding seam treatment device and method

Abstract

The invention discloses a precise steel pipe welding seam processing device and method, and belongs to the technical field of welding seam polishing. The welding seam processing device comprises a base for fixing a steel pipe, a guide rail extending along a steel pipe welding seam is arranged on the base, a sliding seat is slidably mounted on the guide rail, and a turbine rack concentric with the steel pipe is slidably connected into the sliding seat in an arc shape; a first driving mechanism used for driving the worm to reciprocate is arranged at one end of the worm, a supporting block is fixed to the worm gear rack, a supporting rod is movably connected into the supporting block in a limiting mode, a grinding disc is fixed to the end, close to the steel pipe, of the supporting rod, and the supporting rod moves to the limiting position in the direction close to the steel pipe so that the grinding disc can be attached to the steel pipe; second driving mechanisms are fixed to the ends, away from the steel pipes, of the supporting rods. The sliding seat slides along the guide rail, so that a steel pipe welding seam is polished through reciprocating motion of the grinding disc, and poor stability and cost increase caused by reciprocating rotation of the steel pipe are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of weld grinding, and in particular relates to a device and method for processing a precision steel pipe weld. Background Art

[0002] Steel pipes are primarily formed through processes such as coiling and welding steel plates, resulting in a strip-shaped weld. After welding, such as arc welding, the weld metal formed after the molten pool cools and solidifies typically expands slightly compared to the space previously occupied by the molten pool. This often causes the weld to rise above the surface of the parent metal, creating a build-up or reinforcement, necessitating grinding and finishing of the weld.

[0003] In the prior art, a Chinese patent with publication number CN117140253B discloses a weld processing device for an extra-large steel structure. The weld surface can be made smooth by swinging and grinding. However, the steel pipe structure is swung. In order to ensure its stability, the clamping force, supporting force and driving force for the swinging of the steel pipe structure are all large, resulting in increased costs.

[0004] Therefore, it is necessary to propose a precision steel pipe weld processing device and method to solve the above problems. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a precision steel pipe weld processing device and method for solving the problems of increased cost and poor stability caused by swinging steel pipe structural parts in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a precision steel pipe weld processing device, comprising a base for supporting the steel pipe and a clamping mechanism fixedly arranged on the base for clamping the fixed steel pipe, a guide rail extending along the weld seam is fixedly arranged on the base, a slide seat capable of sliding along the guide rail is slidably connected to the guide rail, an arc-shaped plate is fixedly arranged in the slide seat, an arc-shaped turbine rack is slidably connected to the arc-shaped plate, the turbine rack is arranged concentrically with the steel pipe, a worm engaged with the turbine rack is rotatably connected in the slide seat, a first driving mechanism for driving the worm to rotate back and forth is fixedly arranged in the base, and the turbine rack is fixedly arranged on the slide seat. The support block is fixedly connected, and a limiting groove is provided in the support block, and a limiting plate is slidingly connected to the limiting groove. A spring is fixedly connected between the limiting plate and the inner wall of the limiting groove. A support rod extending radially along the steel pipe is axially movably connected to the support block, and the support rod and the limiting plate are rotationally connected by a bearing. The support rod extends from the end near the steel pipe to fix the support block to be connected with a grinding disc, and the limiting plate and the limiting groove near the bottom wall of the steel pipe are abutted to make the grinding disc fit the surface of the steel pipe. The support rod extends from the end away from the steel pipe to fix the support block to be connected with a second driving mechanism for driving the support rod to rotate.

[0007] Furthermore, one end of the worm is fixedly connected to a gear, and a rack meshing with the gear is slidingly connected to the sliding seat. The output end of the first drive mechanism is rotatably connected to a reciprocating screw, and the reciprocating screw is threadedly connected to the rack. Rotating the reciprocating screw can make the rack slide back and forth.

[0008] Furthermore, the rack is provided with a notch in the middle of the toothed side. Sliding the rack so that the notch corresponds to the gear can disengage the gear from the rack, and sliding the rack so that the notch is misaligned with the gear can engage the gear with the rack.

[0009] Furthermore, support blocks are fixedly connected to the opposite sides of the turbine rack, and gear columns are fixedly connected to the support rods movably connected to the two support blocks, and the two gear columns are meshingly arranged, wherein the second driving mechanism is fixedly installed on one of the two support rods, the diameter of the gear column located on the front side along the sliding direction of the slide is smaller than the diameter of the gear column located on the rear side along the sliding direction of the slide, and the abrasive particle size of the grinding disc located on the front side along the sliding direction of the slide is smaller than the abrasive particle size of the grinding disc located on the rear side along the sliding direction of the slide.

[0010] Furthermore, the bottom wall of the grinding disc is provided with an inclined edge inclined away from the steel pipe so that the cross section of the grinding disc is trapezoidal.

[0011] Furthermore, the slide is provided with a marking assembly on the rear side wall along the sliding direction of the slide, and the marking assembly includes a fixing plate fixedly mounted on the rear side wall of the slide, and a marking brush is elastically slidably connected in the fixing plate.

[0012] A weld seam processing method for a precision steel pipe weld seam processing device comprises the following steps: S1: After the steel pipe is fixed on the base, slide the slide along the guide rail to the head end of the steel pipe so that the grinding disc away from the marking component is located at the weld of the steel pipe, and the grinding disc is pressed against the weld protrusion under the action of the spring; S2: Starting the second drive mechanism to rotate the grinding discs on both sides of the turbine rack synchronously, wherein the grinding disc located in front of the slide in the direction of movement performs fast rough grinding, and the grinding disc located in the rear of the slide in the direction of movement performs slow fine grinding; S3: Starting the first driving mechanism so that the first driving mechanism can drive the rack to move back and forth through the reciprocating screw, and when the notch is aligned with the gear, the grinding disc stays at the weld, and when the notch is disengaged from the gear, the grinding disc can slide along the edge of the weld, so that the grinding time of the grinding disc at the center of the weld is longer than the grinding time at the edge of the weld; S4: The travel mechanism drives the slide to move along the guide rail at a preset speed, so that the grinding disc grinds along the extending direction of the weld. During the grinding process, a marking brush elastically arranged at the rear end of the slide leaves a paint mark on the weld. S5: After grinding, observe the paint mark on the weld. If the paint mark is partially missing, it is judged as a weld depression. Fill the weld depression with welding and then grind it smooth.

[0013] The beneficial effects of the present invention are: The present invention can ensure that the grinding disc and the raised weld seam are offset by the elastic setting of the grinding disc, so as to adaptively grind weld seams with different raised heights; The present invention limits the radial displacement of the grinding disc toward the steel pipe by setting the limiting groove, so that the grinding disc will not grind the steel pipe body; The present invention can ensure the stability of the turbine rack during the sliding process by meshing the turbine rack with the worm, and avoid the grinding disc from slipping due to the center of gravity shift of the turbine rack caused by the support block during the movement; The present invention grinds the steel pipe weld by the reciprocating motion of the grinding disc by sliding the slide along the guide rail, thereby avoiding the increase in clamping force, supporting force and driving force for swinging of the steel pipe structural parts caused by the reciprocating rotation of the steel pipe in the prior art, thereby increasing costs.

[0014] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration: Figure 1 A cross-sectional view of a slide structure according to an embodiment of the present invention; Figure 2 A cross-sectional view of the slide and the steel pipe in cooperation with each other according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the slide according to an embodiment of the present invention; Figure 4 Schematic diagram of the overall structure of an embodiment of the present invention.

[0016] The markings in the accompanying drawings are as follows: steel pipe 1, base 2, guide rail 3, slide 4, curved plate 401, turbine rack 5, worm 6, first drive mechanism 601, gear 602, rack 603, reciprocating screw 604, notch 605, support block 7, limit groove 701, limit plate 702, spring 703, support rod 704, grinding disc 705, second drive mechanism 706, gear column 707, fixed plate 8, marking brush 801. DETAILED DESCRIPTION

[0017] like Figures 1 to 4As shown, the present invention provides a precision steel pipe weld processing device, comprising: a base 2 for supporting a steel pipe 1, a clamping mechanism for clamping and fixing the steel pipe 1 is fixedly provided on the base 2, the clamping mechanism is a conventional technical means in this field and is not described in detail here, the base 2 is fixedly provided with a guide rail 3 extending along the weld, the guide rail 3 is provided with a slide 4 that can slide along the guide rail 3, an arc plate 401 is provided in the slide 4, the upper limit sliding connection of the arc plate 401 is connected to an arc-shaped turbine rack 5, wherein the inner ring wall of the turbine rack 5 is provided with an arc groove that cooperates with the arc plate 401, the turbine rack 5 is arranged concentrically with the steel pipe 1, and gaps are provided between the two ends of the turbine rack 5 and the two ends of the arc plate 401, so that the turbine rack 5 can slide along the arc plate 401 within a limited position, and a worm 6 meshing with the turbine rack 5 is rotatably connected in the slide 4, and one end of the worm 6 is provided with a worm 6 for driving the worm 6 The first driving mechanism 601 rotates, and a support block 7 is fixedly connected to the turbine rack 5. A limiting groove 701 is provided in the support block 7. The limiting groove 701 is slidingly connected to a limiting plate 702. A spring 703 is fixedly connected between the limiting plate 702 and the inner wall of the limiting groove 701. A support rod 704 extending radially along the steel pipe 1 is axially movably connected to the support block 7. The support rod 704 and the limiting plate 702 are rotationally connected by a bearing. The support rod 704 extends out of the support block 7 near the end of the steel pipe 1 and is fixedly connected to a grinding disc 705. When the limiting plate 702 and the limiting groove 701 are against the bottom wall of the steel pipe 1, the grinding disc 705 can be fitted with the surface of the steel pipe 1. The support rod 704 extends out of the support block 7 away from the end of the steel pipe 1 and is fixedly connected to a second driving mechanism 706 for driving the support rod 704 to rotate. The first driving mechanism 601 and the second driving mechanism 706 are both motors.

[0018] The guide rail 3 is a vertical cam 24 that is fixed to the base 2 by a clamping mechanism, so that the weld of the steel pipe 1 is consistent with the extension direction of the guide rail 3, and the slide 4 is located above the weld, and the slide 4 can move along the guide rail 3. The movement method is as follows: a crawling robot (not shown in the figure) drives the slide 4 to move along the guide rail 3, or a screw (not shown in the figure) is rotated and installed on the guide rail 3, so that the slide 4 is threadedly connected to the screw, and the slide 4 is slidably connected to the guide rail 3, and the screw is driven by a driving motor to rotate so that the slide 4 can move along the guide rail 3. The above method is a specific embodiment of the slide 4 along the guide rail 3, and its sliding means are conventional technical means in this field, which will not be repeated here. In the process of the slide 4 sliding along the guide rail 3, the first driving mechanism 601 and the second driving mechanism 706 need to be started, wherein starting the first driving mechanism 601 can rotate the worm 6, thereby driving the turbine rack 5 to slide along the arc plate 401. In this solution, the first driving mechanism 601 can be used to rotate the worm 6, thereby driving the turbine rack 5 to slide along the arc plate 401. A driving mechanism 601 is set as a forward and reverse motor so that the worm 6 can rotate back and forth, thereby driving the turbine rack 5 to slide back and forth; starting the second driving mechanism 706 can rotate the support rod 704, thereby driving the grinding disc 705 to rotate to grind the weld. The reciprocating sliding of the turbine rack 5 can drive the grinding disc 705 to reciprocate along the circumferential direction of the steel pipe 1 to achieve reciprocating grinding of the weld, and due to the action of the spring 703, the limit plate 702 moves towards the direction close to the steel pipe 1 under the action of elastic force, so that the grinding disc 705 is abutted against the weld protrusion, thereby ensuring the contact force on the weld and achieving adaptive grinding of welds with different protrusion heights. When the limit plate 702 and the limit groove 701 abut against the bottom wall of the steel pipe 1, the grinding disc 705 can be fitted with the surface of the steel pipe 1 to limit the extreme radial displacement of the grinding disc 705 moving towards the direction close to the steel pipe 1, so that the grinding disc 705 will not grind the steel pipe 1 body.

[0019] This solution uses the elastic setting of the grinding disc 705 to ensure that the grinding disc 705 is in contact with the raised weld, so as to adaptively grind welds with different raised heights, and the setting of the limit groove 701 limits the extreme radial displacement of the grinding disc 705 moving in the direction close to the steel pipe 1, so that the grinding disc 705 will not grind the steel pipe 1 body; the engagement of the turbine rack 5 with the worm 6 can ensure the stability of the turbine rack 5 during the sliding process, and avoid the grinding disc 705 slipping due to the center of gravity shift of the turbine rack 5 caused by the support block 7 during the movement; and the slide 4 slides along the guide rail 3 to grind the weld of the steel pipe 1 through the reciprocating motion of the grinding disc 705, avoiding the increase in the clamping force, supporting force and driving force for swinging of the steel pipe structure caused by the reciprocating rotation of the steel pipe 1 in the prior art, thereby increasing the cost.

[0020] In one embodiment of the present invention, one end of the worm 6 is fixedly connected to a gear 602, and the slide 4 is limitedly slidably connected to a rack 603 that meshes with the gear 602. The output end of the first drive mechanism 601 is rotatably connected to a reciprocating screw 604, and the reciprocating screw 604 is threadedly connected to the rack 603. Rotating the reciprocating screw 604 can make the rack 603 slide back and forth.

[0021] In this solution, the first drive mechanism 601 may be provided with a one-way motor. Starting the first drive mechanism 601 drives the reciprocating screw 604 to rotate, thereby driving the rack 603 to slide back and forth, thereby driving the gear 602 and the worm 6 to rotate back and forth.

[0022] In one embodiment of the present invention, a notch 605 is provided in the middle of the toothed side of the rack 603. Sliding the rack 603 so that the notch 605 corresponds to the gear 602 can disengage the gear 602 from the rack 603. Sliding the rack 603 so that the notch 605 is misaligned with the gear 602 can engage the gear 602 with the rack 603.

[0023] 603 , so that the gear 602 is not meshed with the rack 603.

[0024] In one embodiment of the present invention, the turbine rack 5 is fixedly connected to support blocks 7 on both opposite sides, and the two support blocks 7 are movably connected to support rods 704 fixedly connected to gear columns 707, and the two gear columns 707 are meshed, wherein the second driving mechanism 706 is fixedly installed on one of the two support rods 704, and the diameter of the gear column 707 located on the front side along the sliding direction of the slide 4 is smaller than the diameter of the gear column 707 located on the rear side along the sliding direction of the slide 4, the grinding disc 705 located on the front side along the sliding direction of the slide 4 is a coarse grinding disc, and the grinding disc 705 located on the rear side along the sliding direction of the slide 4 is a fine grinding disc.

[0025] In this solution, the two gear columns 707 are engaged, so that the two support rods 705 can be driven to rotate synchronously through a second driving mechanism 706, so that when the slide 4 slides along the guide rail 3, rough grinding is performed by the rough grinding disc located at the front side, and fine grinding is performed by the fine grinding disc located at the rear side, so as to improve the grinding efficiency. In addition, the two gear columns 707 (with a certain height) are set so that when the support rod 704 moves radially along the steel pipe 1, the two gear columns 707 always remain in a meshing state. The speed ratio of the two gear columns 707 is used to make the rough grinding speed faster to enhance the cutting action and improve the solder removal rate. The centrifugal force generated by the high-speed rotation helps to throw the debris generated by grinding off the surface of the grinding tool, reducing the blockage of the grinding tool by the material; while the fine grinding speed is slower to obtain a more uniform and finer surface texture.

[0026] In one embodiment of the present invention, the bottom wall of the grinding disc 705 is provided with an inclined edge inclined away from the steel pipe 1 so that the cross section of the grinding disc 705 is trapezoidal.

[0027] In this solution, the inclined edge is set to prevent the raised weld from obstructing the grinding disc 705 when the slide 4 moves along the guide rail 3 or the grinding disc 705 moves back and forth in the circumferential direction of the steel pipe 1. The setting of the inclined edge enables the grinding disc 705 to move more smoothly.

[0028] In one embodiment of the present invention, a marking assembly is provided on the rear side wall of the slide 4 along the sliding direction of the slide 4, and the marking assembly includes a fixed plate 8 fixedly installed on the rear side wall of the slide 4, and a marking brush 801 is elastically slidably connected in the fixed plate 8, wherein a limiting slide groove is provided in the fixed plate 8, and the marking brush 801 is limitedly slidably connected in the limiting slide groove, and an elastic part is fixedly connected between the marking brush 801 and the inner wall of the limiting slide groove, and the elastic part is a spring; the marking brush 801 is set to an arc shape close to the steel pipe 1 and fits the steel pipe 1, and the marking brush 801 corresponds to the weld.

[0029] In this scheme, different welding processes and manual welding operation techniques will lead to different weld surface morphologies. For example, in arc welding, the molten filler metal (welding wire or welding rod) and the partially molten base metal together form a molten pool. The weld metal formed after the molten pool cools and solidifies usually has a volume slightly expanded than the space previously occupied by the molten pool, which often causes the weld to be higher than the surface of the base material, forming excess height or enhancement. Another example is resistance welding: this type of welding method mainly relies on pressure and resistance heat to press two pieces of metal together. They usually do not protrude from the surface, but only leave indentations or slight depressions / protrusions at the contact points; or manual welding operations may also cause weld depressions. For the depressions in the welds, the grinding wheel 705 cannot make the depressions in the welds continuous with the surface of the steel pipe 1 during the grinding process. Therefore, after grinding, the slide 4 is used to slide along the guide rail 3 to move the marking brush 801 along the weld, thereby leaving a paint mark on the weld. For the depressions in the welds, the marking brush 801 cannot leave paint marks. Therefore, after grinding, it is possible to determine whether the welds are depressed by the absence of the paint mark. The depressions are welded again to fill the depressions and then ground flat again.

[0030] The present invention also provides a method for processing a precision steel pipe weld, comprising the following steps: S1: After the steel pipe 1 is fixedly mounted on the base 2, the slide 4 is slid along the guide rail 3 to the head end of the steel pipe 1 so that the grinding disc 705 away from the marking assembly is located at the weld of the steel pipe 1, and the grinding disc 705 is abutted against the weld protrusion under the action of the spring 703; S2: The second driving mechanism 706 is started to rotate the grinding discs 705 on both sides of the turbine rack 5 synchronously. The grinding disc 705 located in front of the slide 4 in the moving direction performs fast rough grinding, and the grinding disc 705 located in the rear of the slide 4 in the moving direction performs slow fine grinding. S3: Start the first driving mechanism 601 so that the first driving mechanism 601 can drive the rack 603 to move back and forth via the reciprocating screw 604. When the notch 605 corresponds to the gear 602, the grinding disc 705 stays at the weld. When the notch 605 is disengaged from the gear 602, the grinding disc 705 can slide along the edge of the weld, so that the grinding time of the grinding disc 705 at the center of the weld is longer than that at the edge of the weld. S4: The travel mechanism drives the slide 4 to move along the guide rail 3 at a preset speed, so that the grinding disc 705 grinds along the extending direction of the weld. During the grinding process, a marking brush 801 elastically arranged at the rear end of the slide 4 leaves a paint mark on the weld. S5: After grinding, observe the paint mark on the weld. If the paint mark is partially missing, it is judged as a weld depression. Fill the weld depression with welding and then grind it smooth.

Claims

1. A precision steel pipe weld processing device, comprising a base for supporting the steel pipe and a clamping mechanism fixedly mounted on the base for clamping the steel pipe, characterized in that: The base is fixedly provided with a guide rail extending along the weld seam, and a slide seat that can slide along the guide rail is slidably connected to the guide rail, an arc plate is fixedly provided in the slide seat, and an arc-shaped turbine rack is slidably connected to the arc plate, and the turbine rack is arranged concentrically with the steel pipe, and a worm engaged with the turbine rack is rotatably connected in the slide seat, and a first driving mechanism for driving the worm to rotate reciprocally is fixedly provided in the base, and a support block is fixedly connected to the turbine rack, and a limiting groove is provided in the support block, and the limiting groove The inner limit sliding connection is connected to the limit plate, and a spring is fixedly connected between the limit plate and the inner wall of the limit groove. The support block is axially movably connected to a support rod extending radially along the steel pipe, and the support rod and the limit plate are rotationally connected by a bearing. The support rod extends from the end near the steel pipe to a support block fixedly connected to a grinding disc, and the limit plate and the limit groove are abutted against the bottom wall of the steel pipe to make the grinding disc fit the surface of the steel pipe. The support rod extends from the end away from the steel pipe to a support block fixedly connected to a second driving mechanism for driving the support rod to rotate.

2. The precision steel pipe weld processing device according to claim 1, characterized in that: One end of the worm is fixedly connected to a gear, and a rack meshing with the gear is limitedly slidably connected in the slide seat. The output end of the first drive mechanism is rotatably connected to a reciprocating screw, and the reciprocating screw is threadedly connected to the rack. Rotating the reciprocating screw can make the rack slide back and forth.

3. The precision steel pipe weld processing device according to claim 2, characterized in that: The rack is provided with a notch in the middle of the toothed side. Sliding the rack so that the notch corresponds to the gear can disengage the gear from the rack, and sliding the rack so that the notch is misaligned with the gear can engage the gear with the rack.

4. The precision steel pipe weld processing device according to claim 3, characterized in that: The turbine rack is fixedly connected to support blocks on both opposite sides, and gear columns are fixedly connected to the support rods movably connected to the two support blocks, and the two gear columns are meshed. The second driving mechanism is fixedly installed on one of the two support rods, and the diameter of the gear column located on the front side along the sliding direction of the slide is smaller than the diameter of the gear column located on the rear side along the sliding direction of the slide, and the abrasive particle size of the grinding disc located on the front side along the sliding direction of the slide is smaller than the abrasive particle size of the grinding disc located on the rear side along the sliding direction of the slide.

5. The precision steel pipe weld processing device according to claim 4, characterized in that: The bottom wall of the grinding disc is provided with an inclined edge inclined away from the steel pipe so that the cross section of the grinding disc is arranged in a trapezoidal shape.

6. The precision steel pipe weld processing device according to claim 5, characterized in that: The slide is provided with a marking assembly on the rear side wall along the sliding direction of the slide. The marking assembly includes a fixing plate fixedly installed on the rear side wall of the slide, and a marking brush is elastically and slidably connected in the fixing plate.

7. The weld seam processing method of the precision steel pipe weld seam processing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: After the steel pipe is fixed on the base, slide the slide along the guide rail to the head end of the steel pipe so that the grinding disc away from the marking component is located at the weld of the steel pipe, and the grinding disc is pressed against the weld protrusion under the action of the spring; S2: Starting the second drive mechanism to rotate the grinding discs on both sides of the turbine rack synchronously, wherein the grinding disc located in front of the slide in the direction of movement performs fast rough grinding, and the grinding disc located in the rear of the slide in the direction of movement performs slow fine grinding; S3: Starting the first driving mechanism so that the first driving mechanism can drive the rack to move back and forth through the reciprocating screw, and when the notch is aligned with the gear, the grinding disc stays at the weld, and when the notch is disengaged from the gear, the grinding disc can slide along the edge of the weld, so that the grinding time of the grinding disc at the center of the weld is longer than the grinding time at the edge of the weld; S4: The travel mechanism drives the slide to move along the guide rail at a preset speed, so that the grinding disc grinds along the extending direction of the weld. During the grinding process, a marking brush elastically arranged at the rear end of the slide leaves a paint mark on the weld. S5: After grinding, observe the paint mark on the weld. If the paint mark is partially missing, it is judged as a weld depression. Fill the weld depression with welding and then grind it smooth.

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