Passive three-roll mill for quality control of cold-rolled ribbed steel bar rolling profile

Abstract

The application discloses a passive three-roller mill for quality control of cold-rolled ribbed steel bar rolling shape, which comprises a base, a support arranged on the base, three rollers arranged in Y shape on the support, the rollers being rotatably arranged on the support, and annular grooves arranged on the surfaces of the rollers for cold-rolled ribbed steel bar rolling, and a waist-shaped groove arranged on the annular groove for forming a horizontal rib on the surface of the steel bar. The application is based on the fact that the rollers are continuously worn during use, especially the size of the waist-shaped groove is not required after being used for many times due to wear, so the structure of the roller is improved, the wear can play a prompting role, the inspection efficiency of the size of the waist-shaped groove and the roller surface is improved, and the workers can be reminded in time, so that the situation that the quality control of the cold-rolled ribbed steel bar rolling shape is not in place or does not meet the requirements due to the wear of the waist-shaped groove is avoided as early as possible.

Description

TECHNICAL FIELD

[0001] The present application relates to a passive three-roller mill for cold-rolled ribbed steel bar rolling profile quality control. BACKGROUND

[0002] Cold-rolled ribbed steel bar is a kind of steel bar with two or three crescent shapes formed by reducing the diameter of hot-rolled wire rod through multiple cold rolling and ribbing and eliminating internal stress. Patent CN94245071.X provides a production process and corresponding equipment for cold-rolled ribbed steel bar with radial rolling, which can be wound into bundles or cut to size. The main equipment is a gantry cantilever double-roller mill and a rib rolling machine. By replacing the roller sleeve and rolling wheel of different sizes and rib shapes on the double-roller mill and rib rolling machine, various nominal diameter ribbed steel bars recommended by the national standard can be rolled. Due to the axial traction of different wire drawing machines, the number of radial rolling is reduced, and the rolled steel bar meets the technical requirements of the national standard. According to the delivery requirements of the national standard, it can be wound into bundles or cut to size. This patent claims that by replacing the roller sleeve and rolling wheel of different sizes and rib shapes, various nominal diameter ribbed steel bars recommended by the national standard can be rolled. However, in actual processing, the roller is continuously worn during use and needs to be regularly inspected. If it does not meet the standard, it needs to be ground, otherwise it is difficult to achieve ribbed steel bars that meet the profile quality control requirements.

[0003] In the paper "Cold-rolled ribbed steel bar rolling profile quality control" published in Sichuan Building Materials, Vol. 46, No. 1, January 2020, the author Zhu Wensheng analyzes the rolling mechanism of passive three-roller cold-rolled ribbed steel bar mill and the factors affecting the profile, such as rollers, mother materials, and rolling process, and discusses the control points of cold-rolled ribbed steel bar profile quality to meet the profile indicators in the national standard after rolling. The paper mentions that the roller, as the main working component, is continuously worn during use. The current method is to regularly inspect the waist-type groove and roller surface size. If it does not meet the standard, it needs to be ground to restore the original state. However, the frequency and interval of regular inspection are not easy to grasp. Sometimes, the cold-rolled ribbed steel bar rolled after the last inspection is unqualified, and the roller has been worn a lot before the next inspection. SUMMARY

[0004] The purpose of the present application is to overcome the defects in the prior art and provide a passive three-roller mill for cold-rolled ribbed steel bar rolling profile quality control. Based on the fact that the roller will be continuously worn during use, especially the waist-type groove size will not meet the requirements due to wear after multiple uses, the structure of the roller is improved. The worn roller can provide a prompt, improve the inspection efficiency of the waist-type groove and roller surface size, and timely remind workers to avoid the situation where the cold-rolled ribbed steel bar rolling profile quality control is not in place or does not meet the requirements due to the wear of the waist-type groove.

[0005] To achieve the above objectives, the technical solution of this invention is to design a passive three-roll mill for controlling the shape quality of cold-rolled ribbed steel bars. The mill includes a base, a support mounted on the base, and three rolls arranged in a Y-shape on the support. The rolls are rotatably mounted on the support, and the surface of the rolls is provided with annular grooves for rolling cold-rolled ribbed steel bars. The annular grooves are also provided with waist-shaped grooves for forming transverse ribs on the surface of the steel bars. The rolling power of the passive three-roll mill comes from a drawing device in the production line. The drawing device, located in front of the mill, pulls the steel bars, causing them to undergo diameter reduction and scoring as they pass through the rolls. The three Y-shaped rolls can roll the desired three-sided crescent-shaped steel bars.

[0006] A further technical solution involves a roll comprising an inner roll and a sleeve roll fixedly fitted around the inner roll; annular grooves and waist-shaped grooves are located on the sleeve roll; the inner roll and sleeve roll are made of the same material, and the inner roll and sleeve roll are the same color; the outer surface of the inner roll is coated with an electrophoretic coating, the color of which is different from that of the inner roll. By setting the roll in a split form and then applying the electrophoretic coating to the outside of the inner roll, the electrophoretic coating will be visible once the annular groove or waist-shaped groove is worn. Since the electrophoretic coating is a different color from the inner roll (including the sleeve roll), it can serve as a clear indicator, preventing situations where the rolled cold-rolled ribbed steel bars fail to meet the required shape quality control due to wear of the waist-shaped groove.

[0007] A further technical solution is to provide a slide rail on the base, with the bracket sliding along the slide rail. The bracket has threaded holes, and fastening bolts are fitted into these threaded holes. This design eliminates the need to move the entire rolling mill when fine-tuning the bracket's position is required, making adjustments within the workshop more convenient.

[0008] A further technical solution is to fix a roller shaft at the center of the inner roller, and the roller shaft is rotatably mounted on a support.

[0009] A further technical solution involves setting the roller shafts of the three rolls at a 120° angle. The passive three-roll mill also includes a lubrication mechanism mounted above the base. Alternatively, the lubrication mechanism can take another form, comprising a lubrication conveyor channel with several branch conveyor channels connected to it. A high-pressure air pump is connected to the end of the lubrication conveyor channel furthest from the branch conveyor channel opening. Graphite is placed inside the branch conveyor channels, and a heating plate is positioned above the channel opening on each branch conveyor channel. The heating plate matches the external shape of the branch conveyor channel and is positioned at a distance from the channel opening. The air pressure of the high-pressure air pump is slightly less than the friction between the solid graphite and the inner wall of the branch conveyor channel. The graphite is positioned in the section of the branch conveyor channel from the channel opening to the top of the heating plate. The lubrication mechanism is used to spray lubricating medium onto the rolls and the reinforcing bars passing between the rolls, which is beneficial for the stability of the rolling process.

[0010] The further technical scheme is that the lubricating mechanism comprises a lubricating conveying channel, a plurality of branch conveying channels are communicated on the lubricating conveying channel, and lubricating powder is arranged in the lubricating conveying channel; the other end of the lubricating conveying channel is connected with an air pump, and an on-off valve is arranged on the lubricating conveying channel.

[0011] The advantages and beneficial effects of the present application are that: based on the fact that the roll is continuously worn during use, especially after multiple uses, the size of the waist groove may not meet the requirements due to wear, therefore, the roll is structurally improved, after wear, a prompt function is achieved, the inspection efficiency of the waist groove and the roll surface size is improved, and the worker is reminded in time, so as to avoid the situation that the quality control of the cold-rolled ribbed steel bar rolling shape is not in place or does not meet the requirements due to the wear of the waist groove as early as possible.

[0012] The rolling power of the passive three-roll mill comes from the drawing device in the production line, the drawing device arranged in front of the mill draws the steel bar, the diameter of the steel bar is reduced and the steel bar is scored when passing through the roll, and the three rolls arranged in Y shape can roll the required three crescent-shaped steel bars.

[0013] The roll is arranged in a split type, and an electrophoretic coating is arranged outside the inner roll, once the ring groove or the waist groove is worn, the electrophoretic coating can be seen, and the electrophoretic coating is different in color from the inner roll (including the sleeve roll), so that a clear prompt function is achieved, and the situation that the quality control of the cold-rolled ribbed steel bar rolling shape is not in place or does not meet the requirements due to the wear of the waist groove is avoided as early as possible.

[0014] When fine adjustment of the support position is required, the mill does not need to be moved as a whole, so that the adjustment layout in the workshop is more convenient.

[0015] The lubricating mechanism is used for spraying lubricating medium on the roll and the steel bar passing through the roll, which is beneficial to the stability of the rolling process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of embodiment one of the passive three-roll mill for cold-rolled ribbed steel bar rolling shape quality control of the present application;

[0017] Figure 2 is Figure 1 a schematic view after the top view of

[0018] Figure 3 is Figure 1 a top view of the roll in

[0019] Figure 4 is Figure 1 a side view of the lowermost roll in

[0020] Figure 5 is Figure 4 a schematic view after the ring groove is shown.

[0021] Figure 6 This is a schematic diagram of the lubrication mechanism in Embodiment 2 of the present invention.

[0022] In the diagram: 1. Base; 2. Support; 3. Roller; 4. Circular groove; 5. Waist-shaped groove; 6. Inner roller; 7. Sleeve roller; 8. Electrophoretic coating; 9. Slide rail; 10. Fastening bolt; 11. Lubrication conveying channel; 12. Branch conveying channel; 13. Air pump; 14. On / off valve; 15. High-pressure air pump; 16. Heating element; 17. Graphite liquid tank; 18. Connecting pipe; 19. Color sensor; 20. Controller. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] Example 1:

[0025] like Figures 1 to 5 As shown (for ease of illustration), Figure 4 The annular groove and waist-shaped groove are not shown. Figure 5 (The waist-shaped groove is not shown). This invention is a passive three-roll mill for controlling the shape quality of cold-rolled ribbed steel bars. It includes a base 1, a support 2 mounted on the base 1, and three rolls 3 arranged in a Y-shape on the support 2. The rolls 3 are rotatably mounted on the support 2. The surface of the rolls 3 has annular grooves 4 for rolling cold-rolled ribbed steel bars, and waist-shaped grooves 5 for forming transverse ribs on the surface of the steel bars. Each roll 3 includes an inner roll 6 and a sleeve roll 7 fixedly sleeved outside the inner roll 6. The annular grooves 4 and waist-shaped grooves 5 are located on the sleeve roll 7. The inner roll 6 and sleeve roll 7 are made of the same material and are the same color. The outer surface of the inner roll 6 has an electrophoretic coating 8, the color of which is different from the color of the inner roll 6. A slide rail 9 is provided on the base 1, and the support 2 is slidably mounted along the slide rail 9. The support 2 has threaded holes, and fastening bolts 10 are fitted into the threaded holes. A roller shaft is fixedly mounted at the center of the inner roll 6 and rotatably mounted on the support 2. The three rolls 3 are arranged at a 120° angle; the passive three-roll mill also includes a lubrication mechanism located above the base 1. The lubrication mechanism includes a lubrication conveying channel 11, which is connected to several branch conveying channels 12, and lubricating powder is placed inside the lubrication conveying channel 11; an air pump 13 is connected to the other end of the lubrication conveying channel 11, and an on / off valve 14 is installed on the lubrication conveying channel 11.

[0026] The working principle is as follows:

[0027] The steel bar is pulled by a drawing device located in front of the mill. As the steel bar passes through the rolls 3, it undergoes diameter reduction and scoring. The three rolls 3, arranged in a Y-shape, can roll the required three-sided crescent-shaped steel bar. When the annular groove 4 or the waist groove 5 wears, the electrophoretic coating 8 becomes visible. Since the electrophoretic coating 8 is a different color from the inner roll 6 (and the sleeve roll 7), it serves as a clear indicator, preventing the cold-rolled ribbed steel bar from failing to meet the required shape quality control due to wear of the waist groove 5. During operation, the on / off valve 14 is opened, allowing lubricating powder to be sprayed onto the rolls 3 and the surface of the steel bar.

[0028] Example 2:

[0029] The difference from Embodiment 1 is that, as Figure 6 As shown, the lubrication mechanism includes a lubrication conveying channel 11, which is connected to several branch conveying channels 12. A high-pressure air pump 15 is connected to one end of the lubrication conveying channel 11 away from the opening of each branch conveying channel 12. Graphite is placed inside each branch conveying channel 12, and a heating element 16 is positioned above the opening of each branch conveying channel 12. The heating element 16 matches the external shape of the branch conveying channel 12, and is positioned at a distance from the opening. The air pressure of the high-pressure air pump 15 is slightly less than the frictional force between the solid graphite and the inner wall of the branch conveying channel 12. The graphite is positioned in the section of the branch conveying channel 12 from the opening to the top of the heating element 16. Each branch conveying channel 12 consists of two integrally formed pipes forming a 120° angle. The pipe closer to the lubrication conveying channel 11 is horizontally positioned, while the pipe further away from the lubrication conveying channel 11 is inclined downwards. There are two heating elements 16, with a gap between them (that is, the heating elements 16 do not completely cover the branch conveying channel 12 on the circumference). A connecting pipe 18 is provided on the branch conveying channel 12 between the two heating elements 16, which is connected to the graphite liquid tank 17. Heating wires are covered on the outer wall of the connecting pipe 18 and the graphite liquid tank 17. An on / off valve 14 is provided on the connecting pipe 18. The branch conveying channel 12 is made of transparent flexible tubing. A color sensor 19 is provided on one side of the branch conveying channel 12, facing the graphite liquid (here referring to the heated graphite in the branch conveying channel 12 located at the heating elements 16). The color sensor 19 is electrically connected to the controller 20 located outside the rolling mill. The controller 20 is electrically connected to the on / off valve 14.

[0030] The working principle is as follows:

[0031] Since the graphite is only arranged in a part of the branch conveying channel 12, and only arranged in the part of the branch conveying channel 12 close to the channel port, the arrangement of the heating sheet 16 can set the middle and lower part of the branch conveying channel 12 which is inclined downward to be arranged as that the upper half part is graphite liquid (the graphite in the branch conveying channel 12 segment at the heating sheet 16 is in liquid state due to the heating effect of the heating sheet 16), and the lower half part is graphite solid since the outer wall of the branch conveying channel 12 segment does not have the heating sheet 16, so the lower half part is graphite solid. In this way, the channel port can still be solid graphite to lubricate the roller 3 and the steel bars between the rollers 3, and the lubricating medium above the channel port is liquid graphite (that is, the graphite in the branch conveying channel 12 segment at the heating sheet 16 is in liquid state). When the graphite at the channel port is consumed due to the contact with the roller 3 or the steel bars, and the branch conveying channel 12 is composed of two integrated pipelines, one of which (the pipeline port of this pipeline is the channel port) is arranged to be inclined downward. In this way, the graphite solid at the channel port is consumed, the mass of the graphite solid is reduced, and the static friction force on the graphite solid at the channel port is also reduced (since the pipeline is arranged to be inclined downward). When the graphite solid at the channel port is consumed to a certain extent, the air pressure of the high-pressure air pump 15 is sufficient to push the graphite liquid to the channel port. When the graphite liquid approaches the channel port, it is slowly solidified into solid again due to the absence of the heating sheet 16. In this way, the mass of the graphite solid at the channel port is increased, and the static friction force is also increased, and the initial state balance is restored. When the graphite liquid is pushed by the air pressure generated by the high-pressure air pump 15, the amount of the graphite liquid in the branch conveying channel 12 is reduced. Since the branch conveying channel 12 adopts a transparent hose, the color sensor 19 detects the signal, and the controller 20 controls the opening and closing valve 14 to open. Then, the graphite liquid tank 17 supplements the graphite liquid to the branch conveying channel 12. When the color sensor 19 detects that the graphite liquid reaches the initial liquid level, the controller 20 controls the opening and closing valve 14 to close again. In addition, a power-adjustable heating sheet 16 can be used. The heating sheet 16 is started only when the machine is started. In this way, a graphite bar with a size suitable for the channel port of the branch conveying channel 12 can be inserted at the beginning. After the machine is started, the graphite bar inserted into the upper end part of the branch conveying channel 12 is heated by the heating sheet 16 to become graphite liquid. Since the power-adjustable heating sheet 16 is used, the power of the heating sheet 16 can be larger when the machine is started, so that the graphite bar in the upper end part of the branch conveying channel 12 can be quickly melted into graphite liquid. Then, the power of the heating sheet 16 can be reduced, and only the graphite at the heating sheet 16 needs to be kept in liquid state. In this way, the energy loss caused by the continuous opening of the heating sheet 16 can also be avoided.

[0032] The above only describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make some improvements and refinements without departing from the technical principles of the present application. These improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A passive three-roll mill for controlling the shape quality of cold-rolled ribbed steel bars, characterized in that, The device includes a base, a support mounted on the base, and three Y-shaped rolls arranged on the support. The rolls are rotatably mounted on the support. The surface of the rolls is provided with annular grooves for rolling cold-rolled ribbed steel bars, and waist-shaped grooves for forming transverse ribs on the surface of the steel bars. The rolls include an inner roll and a sleeve roll fixedly sleeved outside the inner roll. The annular grooves and waist-shaped grooves are located on the sleeve roll. The inner roll and the sleeve roll are made of the same material and are the same color. The outer surface of the inner roll is provided with an electrophoretic coating, and the color of the electrophoretic coating is different from the color of the inner roll. The base is provided with a slide rail, and the bracket is slidably mounted on the slide rail. The bracket is provided with a threaded hole, and a fastening bolt is fitted to the threaded hole. The inner roller is fixedly mounted on a roller shaft at its center, and the roller shaft is rotatably mounted on a support. The three rolls are arranged at a 120° angle; the passive three-roll mill also includes a lubrication mechanism located above the base; The lubrication mechanism includes a lubrication conveying channel, which is connected to several branch conveying channels. Lubricating powder is placed inside the lubrication conveying channel. An air pump is connected to the other end of the lubrication conveying channel, and an on / off valve is installed on the lubrication conveying channel. The lubrication mechanism includes a lubrication conveying channel, which is connected to several branch conveying channels. An air pump is connected to one end of the lubrication conveying channel away from the channel opening. Graphite is placed inside the branch conveying channel, and a heating plate matching the external shape of the branch conveying channel is placed above the channel opening. Graphite is placed on the branch conveying channel from the channel opening to the top of the heating plate. The branch conveying channel is composed of two integral pipes forming a 120° angle between them. The pipe closer to the lubrication conveying channel is set horizontally, while the pipe further away from the lubrication conveying channel is set inclined downwards. The heating element is provided in two pieces, which do not completely cover the branch conveying channel. A connecting pipe is provided on the branch conveying channel between the two heating elements to communicate with the graphite liquid tank. Heating wires are provided on the connecting pipes and the outer wall of the graphite liquid tank. An opening and closing valve is provided on the connecting pipes. The heating wires cause the graphite to alternate between solid and liquid states. The branch conveying channel uses a transparent flexible tube. A color sensor facing the graphite is installed on one side of the branch conveying channel. The color sensor is electrically connected to a controller located outside the rolling mill. The controller is electrically connected to the on / off valve.

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