A raising roller, a method for preparing the raising roller and a raising device

Abstract

The present invention relates to a raising roller, a method for preparing the raising roller and a raising device. The raising roller comprises a tube body prepared by a welded tube through a fine rolling process, and roller shafts are connected to both ends of the tube body; the roughness of the outer wall of the tube body is greater than 0.8 μm, the roundness tolerance of the outer diameter of the tube body is not greater than 0.1 mm, and the roundness tolerance of the inner diameter of the tube body is not greater than 0.1 mm. The uniform wall thickness of the tube body can help keep the weight of each raising roller consistent within the error tolerance range during use, increase the balance of the cylinder when working, reduce the use of counterweights, and the roller body has good roundness, which can reduce the jumping of the raising roller during self-rotation.

Description

Technical Field

[0001] The invention relates to the technical field of raising rollers, in particular to a raising roller, a preparation method of the raising roller and a raising device. Background Art

[0002] During operation, the raising roller rotates with the center tube and at the same time, the raising roller rotates at a speed of about 700 rpm. Since there is a weld on the welded pipe, the weld is subjected to local high temperature during welding, and the rigidity of the weld is significantly greater than that of other parts. If the raising roller is prepared using a welded pipe, the self-rotation speed of the raising roller is relatively fast, which can easily lead to excessive vibration of the raising roller due to bending. Therefore, in order to overcome the influence of the weld, many companies use the processing method of seamless pipe turning. Although the seamless pipe has good strength and the vibration of the roller body can be controlled by turning, there are still the following problems:

[0003] 1. The wall thickness of the seamless tube is uneven, and it is impossible to ensure that the raising roller maintains dynamic balance during rotation, so it is necessary to increase the counterweight;

[0004] 2. The wall thickness of the seamless pipe is uneven, and the stress in different parts of the pipe wall is different. After a period of use, the raising roller will jump too much due to bending.

[0005] Therefore, it is urgent to improve the raising roller to eliminate the problem of the counterweight on the cylinder and the vibration of the roller body. Summary of the invention

[0006] In order to solve the above technical problems, the object of the present invention is to provide a raising roller, a method for preparing the raising roller and a raising device.

[0007] According to one aspect of the present invention, there is provided a raising roller, comprising a tube body, the tube body being prepared by a welded tube through a precision rolling process, and roller shafts being connected to both ends of the tube body;

[0008] The roughness of the outer wall of the tube body is greater than 0.8 μm, the roundness tolerance of the outer diameter of the tube body is not greater than 0.1 mm, and the roundness tolerance of the inner diameter of the tube body is not greater than 0.1 mm.

[0009] Compared with the prior art, the present invention has the following beneficial effects: the uniform wall thickness of the tube body can help keep the weight of each raising roller consistent within the allowable error range during use, increase the balance of the cylinder during operation, reduce the use of counterweights, and the roller body has good roundness, which can reduce the vibration of the raising roller during rotation.

[0010] Furthermore, a raising device is detachably connected to the outer wall of the tube body, and the raising device is a sticky cloth or a raising needle.

[0011] The beneficial effect of adopting the above further technical solution is that a raising device can be installed during use, which is convenient and quick.

[0012] Furthermore, the roller shaft includes a connecting portion and an assembly shaft, the connecting portion extends into the tube body, the connecting portion includes a base, the base is provided with a plurality of protruding connecting pieces, and the end of the connecting piece away from the base is frictionally matched with the tube body.

[0013] The beneficial effect of adopting the above further technical solution is that, compared with the traditional flange connection, the coaxiality between the roller shaft and the welded pipe is increased, which can prevent the roller shaft from breaking during use.

[0014] Furthermore, the length of the connecting portion is 60-300 mm.

[0015] The beneficial effect of adopting the above further technical solution is that the coaxiality between the roller shaft and the welded pipe can reach the optimal range without significantly increasing the weight of the raising roller.

[0016] According to another aspect of the present invention, a method for preparing a raising roller is provided, which is prepared by the following method:

[0017] Step 1: Roll the steel plate into a steel pipe, and then weld the steel pipe on a welding machine to obtain a welded pipe;

[0018] Step 2: The welded pipe is sequentially subjected to annealing-pickling-finishing rolling processes, and the wall thickness of the welded pipe is reduced by 0.5-3 mm after finishing rolling, and the roundness tolerance of the inner diameter and outer diameter of the welded pipe is not greater than 0.1 mm;

[0019] Step 3: Assemble rollers at both ends of the welded pipe, and make the welded pipe reach a preset weight after the rollers are assembled.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the rigidity of the weld seam of the welded pipe is improved through the fine rolling process; after fine rolling, the wall thickness of the welded pipe is reduced by 0.5-3mm, the diameter is increased by 5-20mm, the bending resistance of the welded pipe is increased, and the process is simple and suitable for mass production; the uniform wall thickness of the pipe body can help to keep the weight of each raising roller consistent within the allowable error range during use, increase the balance of the cylinder when working, reduce the use of counterweights, and the roller body has good roundness, which can reduce the vibration of the raising roller during rotation.

[0021] Furthermore, the welded pipe is sequentially subjected to an annealing-pickling-finishing rolling process, including:

[0022] Step 2-1: Annealing: Heat the welded pipe to 600-700°C under the protection of a mixture of nitrogen and hydrogen, keep it warm for 17-18 hours, then cool it to 75-85°C and enter the pickling step;

[0023] Step 2-2: Pickling: Pickle the welded pipe with a 15% to 25% hydrochloric acid solution, and then clean it with a 50-85°C aqueous solution;

[0024] Step 2-3: Finish rolling: The annealed welded pipe is finish rolled.

[0025] The beneficial effect of adopting the above further technical solution is that through the annealing-pickling-finishing rolling process, the mechanical properties such as plasticity and toughness of the welded pipe are improved, the rigidity of the weld seam of the welded pipe is improved, the rigidity of each part of the welded pipe is made consistent, and the bending resistance of the welded pipe is increased.

[0026] Further, the welded pipe is first heated to 600-700°C, kept at this temperature for 17-18 hours, and then cooled to 75-85°C, including:

[0027] Heating stage: Under the protection of a mixture of nitrogen and hydrogen, heat the welded pipe to 600-700°C and keep it warm for 17-18 hours;

[0028] Annealing stage 1: After cooling the heating container (bell-type furnace) for 10 to 16 hours;

[0029] Annealing stage 2: When the temperature in the heating container reaches 500-550°C, water cooling and air cooling are carried out until the welded pipe cools to 75-85°C.

[0030] The beneficial effect of adopting the above further technical solution is that through a reasonable cooling rate, the mechanical properties of the welded pipe, such as plasticity and toughness, are further improved.

[0031] Furthermore, before assembling rollers at both ends of the welded pipe, the surface of the welded pipe after finish rolling is roughened.

[0032] The beneficial effects of adopting the above further technical solution are:

[0033] Furthermore, it also includes: straightening the welded pipe after assembling the roller shaft; and / or straightening the welded pipe after finish rolling.

[0034] The beneficial effect of adopting the above further technical solution is that the surface of the welded pipe after fine rolling is roughened, so that the roughening device can be conveniently connected to the outer wall of the welded pipe.

[0035] According to another aspect of the present invention, there is provided a raising device, characterized in that it comprises a cylinder and any one of the raising rollers described above, the number of the raising rollers is 40-48, and the raising rollers are arranged in a ring shape on the cylinder disk.

[0036] Compared with the prior art, the present invention has the following beneficial effects: the cylinder has good balance when rotating, and the counterweight can be reduced or not used; the roundness of the raising roller body is good, and the jumping of the raising roller when rotating can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] AttachedFigure 1 It is a structural schematic diagram of a welded pipe;

[0038] Attached Figure 2 For attachment Figure 1 A is an enlarged view;

[0039] Attached Figure 3 is a schematic diagram of the structure of the roller;

[0040] Attached Figure 4 It is a structural schematic diagram of a raising roller;

[0041] Attached Figure 5 This is a structural diagram of the cylinder.

[0042] The numbers shown in the accompanying drawings are: 1-tube body; 2-roller shaft; 3-raising device; 31-connecting part; 32-assembly shaft; 33-connecting piece; 34-base; 4-raising roller; 5-cylinder disk. DETAILED DESCRIPTION

[0043] In order to better understand the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and the accompanying drawings of the specification.

[0044] Embodiment 1:

[0045] A raising roller 4 comprises a tube body 1, wherein the tube body 1 is made of a welded tube through a fine rolling process, and roller shafts are connected to both ends of the tube body 1, and roller shafts 2 are connected to both ends of the tube body 1; the roughness of the outer wall of the tube body 1 is greater than 0.8 μm, the roundness tolerance of the outer diameter of the tube body 1 is not greater than 0.1 mm, and the roundness tolerance of the inner diameter of the tube body 1 is not greater than 0.1 mm; a raising device 3 is detachably connected to the outer wall of the tube body 1, and the raising device 3 is a sticky cloth or a raising needle. For the convenience of transportation, the raising device 3 can be installed when in use, which is convenient and quick.

[0046] The roller shaft 2 includes a connecting portion 31 and an assembly shaft 32. The connecting portion 31 has a length of 60-300 mm and extends into the tube body 1. The connecting portion 31 includes a base 34. The base 34 is provided with a plurality of protruding connecting members 33. The end of the connecting member 33 away from the base 34 is frictionally matched with the tube body 1.

[0047] This embodiment provides a method for preparing the above-mentioned raising roller, comprising the following steps:

[0048] Step 1: Roll the steel plate into a steel pipe, and then weld the steel pipe on a welding machine to obtain a welded pipe;

[0049] Step 2: The welded pipe is sequentially subjected to annealing-pickling-finishing rolling process, and the wall thickness of the welded pipe is reduced by 0.5-3mm after finishing rolling, and the roundness tolerance of the inner diameter and outer diameter of the welded pipe is not greater than 0.1mm. Preferably, the wall thickness of the welded pipe is reduced by 1mm after finishing rolling, which is divided into the following three steps:

[0050] Step 2-1: Annealing: The welded pipe is protected by a mixture of nitrogen and hydrogen, including introducing a mixture of nitrogen and hydrogen into a heating container at a flow rate of 10-30m3 / h, and exhausting the gas in the heating container at the same flow rate;

[0051] First, the welded pipe is heated to 600-700°C, kept warm for 17-18 hours, and then cooled to 75-85°C. Step 2-1 specifically includes: heating stage: under the protection of a mixed gas of nitrogen and hydrogen, the welded pipe is heated to 600-700°C and kept warm for 17-18 hours; annealing stage 1: after the heating container (bell-type furnace body) is cooled for 10-16 hours; annealing stage 2: when the temperature in the heating container reaches 500-550°C, water cooling and air cooling are carried out until the welded pipe is cooled to 75-85°C, and then the pickling step is entered;

[0052] Step 2-2: Pickling: Pickle the welded pipe with a 15% to 25% hydrochloric acid solution, and then clean it with a 50-85°C aqueous solution;

[0053] Step 2-3: Finish rolling: Finish rolling the annealed welded pipe, and straightening the welded pipe after finish rolling;

[0054] Step 3: performing surface roughening treatment on the welded pipe after fine rolling, wherein the surface roughening treatment includes but is not limited to grinding, sandblasting or setting axial lines on the outer wall of the pipe body 1;

[0055] Step 4: Assembling rollers 2 at both ends of the welded pipe, and making the welded pipe after the rollers 2 are assembled reach a preset weight, and straightening the welded pipe after the rollers 2 are assembled;

[0056] Step 5: Connect the raising device 3 to the outer wall of the welded pipe.

[0057] The rigidity of the weld seam of the welded pipe is improved by the finishing process. After finishing, the wall thickness of the welded pipe is reduced by 0.5-3mm, the diameter is increased by 5-20mm, the bending resistance of the welded pipe is increased, and the yield strength is 400-600kg, which is about 2 times higher than that of the welded pipe with the same wall thickness that has not been finished rolled. The process is simple and suitable for mass production. The uniform wall thickness of the pipe body 1 can help keep the weight of each raising roller 4 consistent within the allowable error range during use, increase the balance of the cylinder when working, reduce the use of counterweights, and the roller body has good roundness, which can reduce the vibration of the raising roller 4 during rotation.

[0058] The present embodiment provides a raising device using the above-mentioned raising roller 4, including a cylinder and any one of the above-mentioned raising rollers 4, wherein the number of the raising rollers 4 is 40-48, and the raising rollers 4 are arranged in a ring shape on the cylinder plate 5. The cylinder has good balance when rotating, and the counterweight can be reduced or not used. The raising roller 4 has good roundness, and the vibration of the raising roller 4 during rotation can be reduced.

[0059] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features have similar functions to those disclosed in the present application (but not limited to).

Claims

1. A raising roller, characterized in that: It comprises a tube body, which is prepared by sequentially annealing-pickling-finishing rolling of a welded tube, and rollers are connected to both ends of the tube body; The roughness of the outer wall of the tube body is greater than 0.8 μm, the roundness tolerance of the outer diameter of the tube body is not greater than 0.1 mm, and the roundness tolerance of the inner diameter of the tube body is not greater than 0.1 mm; The roller shaft comprises a connecting portion and an assembly shaft, wherein the connecting portion extends into the tube body, the connecting portion comprises a base, and the base is provided with a plurality of protruding connecting pieces, and an end of the connecting piece away from the base is frictionally matched with the tube body.

2. The raising roller according to claim 1, characterized in that: The outer wall of the tube body is detachably connected with a raising device, and the raising device is a sticky cloth or a raising needle.

3. The raising roller according to claim 1, characterized in that: The length of the connecting portion is 60-300 mm.

4. A method for preparing a raising roller, characterized in that: It is prepared by the following method, Step 1: Roll the steel plate into a steel pipe, and then weld the steel pipe on a welding machine to obtain a welded pipe; Step 2: The welded pipe is sequentially subjected to annealing-pickling-finishing rolling processes, and the wall thickness of the welded pipe is reduced by 0.5-3 mm after finishing rolling, and the roundness tolerance of the inner diameter and outer diameter of the welded pipe is not greater than 0.1 mm; Step 3: Assemble rollers at both ends of the welded pipe, and make the welded pipe reach a preset weight after the rollers are assembled.

5. The method for preparing a raising roller according to claim 4, characterized in that: The welded pipe is sequentially subjected to annealing-pickling-finishing rolling processes, including: Step 2-1: Annealing: Heat the welded pipe to 600-700°C under the protection of a mixture of nitrogen and hydrogen, keep it warm for 17-18 hours, then cool it to 75-85°C and enter the pickling step; Step 2-2: Pickling: Pickle the welded pipe with a 15% to 25% hydrochloric acid solution, and then clean it with a 50-85°C aqueous solution; Step 2-3: Finish rolling: The annealed welded pipe is finish rolled.

6. The method for preparing a raising roller according to claim 5, characterized in that: First, heat the welded pipe to 600-700℃, keep it warm for 17-18 hours, and then cool it to 75-85℃, including: Heating stage: Under the protection of a mixture of nitrogen and hydrogen, heat the welded pipe to 600-700°C and keep it warm for 17-18 hours; Annealing stage 1: After the heating container (bell-type furnace) is cooled for 10 to 16 hours; Annealing stage 2: When the temperature in the heating container reaches 500-550°C, water cooling and air cooling are carried out until the welded pipe cools to 75-85°C.

7. The method for preparing a raising roller according to claim 4, characterized in that: Before assembling rollers at both ends of the welded pipe, the surface of the welded pipe after finish rolling is roughened.

8. The method for preparing a raising roller according to claim 4, characterized in that: Also includes: The welded pipe is straightened after the rollers are assembled; and / or, the welded pipe is straightened after the finish rolling.

9. A raising device, characterized in that: It comprises a cylinder and the raising rollers according to any one of claims 1 to 3, wherein the number of the raising rollers is 40 to 48 and the raising rollers are arranged in a ring shape on the cylinder disk.

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