Device for grinding the wall panels of vertical cylindrical steel welded tanks in the circumferential direction

Abstract

The utility model discloses a kind of wallboard circumferential polishing devices of vertical cylindrical steel welded storage tank, including abrasive belt sander, the abrasive belt sander is installed in the operating platform that can move along the inside circumferential of storage tank wallboard, the operating platform includes operating platform frame, operating platform frame includes top plate, bottom plate and side frame, the upper portion and lower portion of inside of side frame are respectively equipped with travelling wheel and top wheel, abrasive belt sander is installed in the middle portion of inside of side frame.The utility model is integrated design by track type moving mechanism and abrasive belt polishing system, can be used for the high-precision polishing operation of tank inner wall weld reinforcement ≤1mm, single-ring weld polishing time is shortened to 3 hours (diameter 10m), need not to erect scaffold, improve the work efficiency of weld polishing, the utility model can adapt to the storage tank of diameter ≥8m.

Description

Technical Field

[0001] This utility model relates to a weld grinding device, specifically, to a circumferential grinding device for the wall panels of a vertical cylindrical steel welded storage tank. Background Technology

[0002] In the construction of large vertical cylindrical steel welded storage tanks, the grinding of the circumferential welds of the wall panels presents the following main technical challenges:

[0003] (1) Insufficient precision of manual grinding: Traditional manual grinding is difficult to control the weld height to ≤1mm, and the actual measurement error often exceeds ±2mm, which leads to a decrease in the sealing performance of the storage tank. Especially for storage tanks with internal and external floating roofs, the weld height exceeds 1mm, which can easily cause the floating roof to get stuck and damage the sealing device.

[0004] (2) Poor adaptability of large-diameter storage tanks: Existing automated equipment is mostly suitable for storage tanks with a diameter of <8m, and has problems such as poor track stability and uneven grinding pressure for large-diameter storage tanks with a diameter of ≥8m.

[0005] (3) Harsh working environment inside the tank: The space inside the tank is closed, and the dust concentration generated by manual grinding can reach 50mg / m³ (national standard ≤8mg / m³), and the noise exceeds 90dB, which endangers the health of operators.

[0006] (4) Efficiency versus cost: It takes 12 hours to manually grind the weld seam of a 10m diameter vertical cylindrical storage tank, and a full scaffolding needs to be erected, accounting for 40% of the total construction cost. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a circumferential grinding device for the wall panels of a vertical cylindrical steel welded storage tank, which at least achieves the purpose of improving the grinding efficiency of the tank weld.

[0008] To solve the above technical problems, the technical solution adopted by this utility model is: a circumferential grinding device for the wall panel of a vertical cylindrical steel welded storage tank, including a belt grinder. The belt grinder is installed on an operating platform that can move circumferentially along the inner side of the storage tank wall panel. The operating platform includes an operating platform frame, which includes a top plate, a bottom plate, and a side frame. The upper and lower parts of the inner side of the side frame are respectively equipped with a traveling wheel and a top wheel. The belt grinder is installed in the middle of the inner side of the side frame.

[0009] Furthermore, the upper part of the top plate of the operating platform frame is provided with lifting lugs.

[0010] Furthermore, a walking wheel drive motor for driving the walking wheels to rotate is installed within the operating platform frame.

[0011] Furthermore, a belt grinder drive motor for driving the belt grinder is installed within the operating platform frame.

[0012] Furthermore, the top wheel is connected to the telescopic structure, which includes an internally threaded sleeve and a screw. The internally threaded sleeve is installed on the lower part of the side frame facing the inner side of the wall panel. The screw is threaded into the inside of the internally threaded sleeve. The front end of the screw is connected to the top wheel bracket. The top wheel is installed on the axle inside the top wheel bracket.

[0013] Furthermore, angle steel is fixed to the side frame of the operating platform frame, and the support column of the belt sander is fixedly installed on the angle steel by U-bolts and matching nuts.

[0014] Furthermore, the base plate of the operating platform frame is covered with patterned steel plate.

[0015] Furthermore, protective railings are vertically installed around the base plate of the operating platform frame.

[0016] This utility model, through the integrated design of a track-type moving mechanism and a sanding belt grinding system, can be used for high-precision grinding of weld seam height ≤1mm on the inner wall of tanks. The grinding time for a single weld seam is shortened to 3 hours (10m in diameter), and no scaffolding is required, which improves the work efficiency of weld seam grinding. This utility model can be adapted to storage tanks with a diameter ≥8m. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of the wall panel annular grinding device described in this utility model;

[0019] Figure 2 This is a schematic diagram of the installation structure of a belt sander.

[0020] In the diagram, 1-belt sander, 2-top plate, 3-bottom plate, 4-side frame, 5-walking wheel, 6-top wheel, 7-lifting lug, 8-walking wheel drive motor, 9-belt sander drive motor, 10-angle steel, 11-support column, 12-U-bolt, 13-nut, 14-guardrail, 15-control box, 16-tank wall panel, 17-patterned steel plate, 18-rubber shock absorber. Detailed Implementation

[0021] To enable those skilled in the art to better understand this utility model, the present utility model will be further described clearly and completely below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0022] This utility model provides a typical embodiment of a vertical cylindrical steel welded storage tank wall panel circumferential grinding device, which includes three main parts: a belt grinding system, a support system, and a moving drive system.

[0023] The belt sanding system includes a belt sander 1 and a belt sander drive motor 9. The support system includes a frame-type operating platform. The movement drive system includes wheels 5, top wheels 6, and a wheel drive motor 8.

[0024] The belt sander 1 is installed on an operating platform that can move circumferentially along the inner side of the tank wall 16, such as Figure 1 As shown, the operating platform includes an operating platform frame, which includes a top plate 2, a bottom plate 3, and a side frame 4. The upper and lower parts of the inner side of the side frame 4 are respectively equipped with a traveling wheel 5 and a top wheel 6. The belt sander 1 is installed in the middle of the inner side of the side frame 4.

[0025] In the above embodiments, the traveling wheel 5 has grooves on its traveling surface, allowing it to be attached to the top of the tank wall panel 16 or to a circular track laid on the top of the tank wall panel 16. When the traveling wheel 2 moves in a circular motion along the tank wall panel 16 or the track, the operator uses a belt sander 1 on the operating platform to grind the transverse weld seams of the tank. The top wheel 6 is supported on the inner side of the tank wall panel 16 and can roll on the inner surface of the tank wall panel 16 as the operating platform moves.

[0026] The traveling wheels 2 are driven by the traveling wheel drive motor 8, which is installed inside the operating platform frame. The belt sander 1 is driven by the belt sander drive motor 9, which is also installed inside the operating platform frame.

[0027] In a preferred embodiment, the top plate 2 of the operating platform frame is provided with a lifting lug 7. Using a crane, the wall panel annular grinding device of this utility model is lifted as a whole through the lifting lug 7 and installed on the inner side of the tank wall panel 16.

[0028] In a preferred embodiment, a retractable top wheel 6 is provided to adjust the distance between the top wheel and the tank wall plate 16. In this embodiment, the top wheel 6 is connected to a telescopic structure, which includes an internally threaded sleeve and a screw. The internally threaded sleeve is installed on the lower part of the side frame facing the inner side of the wall plate. The screw is threaded into the inside of the internally threaded sleeve, and the front end of the screw is connected to a top wheel bracket. The top wheel is mounted on a wheel axle inside the top wheel bracket.

[0029] like Figure 2 As shown, an angle steel 10 is fixed on the side frame 4 of the operating platform frame, and the support column 11 of the belt sander is fixedly installed on the angle steel 10 by U-bolts 12 and matching nuts 13.

[0030] In addition, the upper surface of the base plate 3 of the operating platform frame is covered with a patterned steel plate 17, and a guardrail 14 is vertically installed around the base plate 3 of the operating platform frame.

[0031] The following provides a relatively specific embodiment to further clarify and fully illustrate the technical solution claimed by this utility model.

[0032] (a) Support System

[0033] The operating platform frame is welded from [10 channel steel (Q235B), with 4mm patterned steel plate laid at the bottom and guardrail 14 at the bottom edge.

[0034] The support column 11 of the belt sander is fixed to the support angle steel (∠63*5, Q235B) of the operating platform frame with M12 U-bolts, and then locked with double nuts (M12). Rubber shock-absorbing pads 18 are used to reduce vibration.

[0035] (ii) Mobility Drive System

[0036] The side frame of the operating platform is equipped with 6-inch wheels on the top and 3-inch retractable top wheels on the bottom.

[0037] The walking wheel drive motor 8 drives the walking wheel 5 to move in a circumferential direction, with a linear speed adjustable from 0.3 to 0.8 m / min.

[0038] (III) Belt Abrasive Grinding System

[0039] The belt sander 1 is driven by a belt sander drive motor 9, which provides a belt linear speed of 15 m / s and adjustable sanding pressure (0.2-0.5 MPa). The sanding belt forms an angle of 15°±2° with the tank wall, and the contact gap is ≤1 mm. The output shaft of the belt sander drive motor 9 is collinear with the shaft of the sanding belt wheel to ensure uniform belt tension.

[0040] The control box 15 integrates a PLC control system to monitor the grinding depth in real time. When the remaining height is greater than 1mm, it can automatically trigger a secondary grinding program.

[0041] During operation, the circumferential grinding device is hoisted to the inner wall of the tank above the weld to be ground using the lifting lugs. The drive motor 8 of the traveling wheel is started, moving circumferentially at a speed of 0.5 m / min. The drive motor 9 of the belt grinder is started, driving the sanding belt to grind at a speed of 15 m / s. The weld height is monitored in real time through the operation control box 15.

[0042] Using the grinding device provided in this embodiment, the grinding time for a single ring of the inner weld seam of the 16 circumference of the tank wall plate with a diameter of φ10m is reduced from 12 hours to 3 hours. No scaffolding is required, the equipment investment cost is reduced by 60%, and the overall construction cost is reduced by 45%.

[0043] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. For those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for circumferential grinding of wall panels of a vertical cylindrical steel welded storage tank, comprising a belt sander, characterized in that: The belt sander is installed on an operating platform that can move circumferentially along the inner side of the tank wall. The operating platform includes an operating platform frame, which includes a top plate, a bottom plate, and side frames. The upper and lower parts of the inner side frames are respectively equipped with traveling wheels and top wheels. The belt sander is installed in the middle of the inner side frames.

2. The circumferential grinding device for the wall panels of the vertical cylindrical welded steel storage tank according to claim 1, characterized in that: The upper part of the top plate of the operating platform frame is provided with lifting lugs.

3. The circumferential grinding device for the wall panels of a vertical cylindrical welded steel storage tank according to claim 1 or 2, characterized in that: The operating platform frame is equipped with a walking wheel drive motor for driving the walking wheels to rotate.

4. The circumferential grinding device for the wall panels of the vertical cylindrical welded steel storage tank according to claim 3, characterized in that: The operating platform frame is equipped with a belt grinder drive motor for driving the belt grinder.

5. The circumferential grinding device for the wall panels of a vertical cylindrical welded steel storage tank according to claim 1 or 4, characterized in that: The top wheel is connected to the telescopic structure, which includes an internally threaded sleeve and a screw. The internally threaded sleeve is installed on the lower part of the side frame facing the inner side of the wall panel. The screw is threaded into the inside of the internally threaded sleeve. The front end of the screw is connected to the top wheel bracket. The top wheel is installed on the axle inside the top wheel bracket.

6. The circumferential grinding device for the wall panels of the vertical cylindrical welded steel storage tank according to claim 5, characterized in that: Angle steel is fixed to the side frame of the operating platform frame, and the support column of the belt sander is fixedly installed on the angle steel by U-bolts and matching nuts.

7. The circumferential grinding device for the wall panels of the vertical cylindrical welded steel storage tank according to claim 6, characterized in that: The base plate of the operating platform frame is covered with patterned steel plate.

8. The circumferential grinding device for the wall panels of the vertical cylindrical welded steel storage tank according to claim 7, characterized in that: The base plate of the operating platform frame is vertically equipped with guardrails.

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