A high-speed rolling mill for cold-rolled ribbed steel bars

Abstract

This application provides a high-speed cold-rolled ribbed steel bar mill, relating to the field of high-speed steel bar mills. The mill includes a machine body with a frame at its top. A lead screw is rotatably mounted at the top of the frame. A pair of drive shafts are installed inside the frame. A rectangular support frame is slidably mounted inside the frame. A set of linearly arranged rolls are installed at the upper and lower ends of the inner side of the support frame. A second connection port is opened in the middle of each roll. The drive shafts are located within the corresponding first and second connection ports. Rib grooves are opened on the outer wall of each roll, with the size of each rib groove increasing or decreasing sequentially along the axial direction. This application breaks down the traditional single integral roll with multiple centrally located transverse rib grooves into multiple shorter independent rolls, reducing the actual participating mass and rotational inertia of the rotating components, decreasing the drive torque requirement, reducing operating energy consumption, and improving the reliability and service life of the equipment.

Description

Technical Field

[0001] This invention relates to the field of high-speed steel bar rolling mills, and more specifically, to a high-speed rolling mill for cold-rolled ribbed steel bars. Background Technology

[0002] Cold-rolled ribbed steel bars are structural steel products formed by cold rolling to reduce diameter and rolling transverse ribs onto the surface. The transverse ribs on the surface can enhance the bonding and anchoring performance with concrete. In the rolling equipment for cold-rolled ribbed steel bars, transverse rib grooves (also known as waist grooves) are provided on the outer circumferential surface of the rolls to roll the transverse ribs required for forming on the surface of the steel bars. As cold-rolled ribbed steel bars develop towards high speed and multiple specifications, higher requirements are placed on the dynamic response characteristics, energy consumption level and operational reliability of the rolling mill.

[0003] In most existing cold-rolled ribbed steel bar mills, to meet the production needs of steel bars with different diameters, multiple transverse rib grooves corresponding to different specifications of steel bars are usually distributed circumferentially on the outer circumferential surface of the same roll. The groove type, size, pitch and other parameters of each transverse rib groove are different. When it is necessary to switch to produce steel bars of different specifications, the roll is pushed horizontally to align the corresponding transverse rib groove with the rolling line. During the rolling process, the drive system drives the entire roll to rotate together.

[0004] Although the above solution utilizes the method of centrally opening multiple transverse rib grooves on a single roll to meet the switching needs of producing multiple specifications of steel bars, in actual use, the concentration of multiple transverse rib grooves on a single roll means that regardless of which specification of transverse rib groove is used during rolling, the entire roll must be driven to rotate. This results in high mill drive torque, high operating energy consumption, and mechanical impact caused by inertial torque, which exacerbates the wear of transmission components such as bearings. At the same time, when a single transverse rib groove is partially worn or damaged, the entire roll needs to be repaired or replaced, resulting in high maintenance costs.

[0005] Therefore, we made improvements and proposed a high-speed rolling mill for cold-rolled ribbed steel bars. Summary of the Invention

[0006] The purpose of this invention is to address the problem that most existing high-speed cold-rolled ribbed steel bar mills have multiple transverse rib grooves concentrated on a single roll. These multiple transverse rib grooves are concentrated on a single roll, and regardless of the specification of the transverse rib grooves used during rolling, the entire roll needs to be driven to rotate, resulting in high mill drive torque, high operating energy consumption, and high maintenance costs.

[0007] To achieve the above-mentioned objectives, the present invention provides a high-speed cold-rolled ribbed steel bar mill to solve the aforementioned problems.

[0008] The application is as follows:

[0009] A high-speed cold-rolled ribbed steel bar mill includes a machine body, a frame at the top of the machine body, a lead screw rotatably mounted at the top of the frame, a pair of drive shafts installed inside the frame, a drive box for driving the lead screw and the two drive shafts to rotate respectively installed on one side of the machine body, a rectangular support frame slidably mounted inside the frame, a pair of first connection ports opened at the upper and lower ends of both sides of the support frame, a set of linearly arranged rolls installed at the upper and lower ends of the inner side of the support frame, a second connection port opened in the middle of the rolls, the drive shafts located in the corresponding first and second connection ports, and rib grooves opened on the outer wall of each roll, with the specifications of each rib groove increasing or decreasing sequentially along the axial direction;

[0010] The inner wall of the second connection port is fixed with a set of first protruding ribs at equal intervals in an annular shape, and the outer side of the drive shaft is fixed with a set of second protruding ribs at equal intervals in an annular shape. The second protruding ribs are adapted to and engaged with one of the sets of first protruding ribs.

[0011] As a preferred technical solution of this application, a set of slide rails is fixed on both the upper and lower inner walls of the frame, and a sliding sleeve adapted to the corresponding slide rail is fixedly installed at the upper and lower ends of the support frame, a linear slot is opened at the top of the frame, and a threaded seat that passes through the linear slot and is threaded with the lead screw is fixedly installed at the top of the support frame.

[0012] As a preferred technical solution of this application, a set of mounting frames is installed on the support frame. Each set of mounting frames consists of two U-shaped frames with opposite openings. The upper and lower ends of the U-shaped frames are provided with a third connection port for the drive shaft to pass through. The two opposite rollers are respectively installed at the upper and lower ends of the two U-shaped frames on opposite sides.

[0013] As a preferred technical solution of this application, the roll has an annular connecting portion in the middle of both sides, and a bearing adapted to the connecting portion is installed on the U-shaped frame at the third connecting port.

[0014] As a preferred technical solution of this application, a first air passage is provided at the middle of one end of the drive shaft, the outer end port of the first air passage is located at the middle position of the end face of the drive shaft, and the inner end port of the first air passage is opposite to the corresponding roll.

[0015] As a preferred technical solution of this application, the drive shaft has a plurality of second air passages arranged in a ring at equal intervals in the middle. The outer port of the second air passage is opposite to the corresponding roll, and the inner port of the second air passage is connected to the first air passage.

[0016] As a preferred technical solution of this application, the side of the roll is provided with a set of heat dissipation channels that are equidistantly arranged in an annular shape and correspond to the second air channel. The inner port of the heat dissipation channel is located inside the second connection port and opposite to the second air channel, and the outer port of the second air channel is located on one side of the rib groove.

[0017] As a preferred technical solution of this application, the second air passage is located in the middle of the second convex ridge, and a connecting pipe is elastically installed at the port of the second air passage. The outer end of the connecting pipe extends outward from the second convex ridge and is tangent to a hemisphere. The outer edge of the inner port of the heat dissipation air passage is an arc surface that matches the hemisphere.

[0018] As a preferred technical solution of this application, the second convex ridge has a mounting groove in the middle, and a mounting plate is adapted and fixed in the mounting groove. The mounting plate has a connecting hole in the middle corresponding to the second air passage. The outer edge of the end of the connecting pipe has a convex ring located inside the connecting hole. The middle of the second air passage has a stepped surface, and a spring is installed between the convex ring and the stepped surface.

[0019] As a preferred technical solution of this application, both ends of the first convex ridge and both ends of the second convex ridge are triangular cusps.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In the scheme of this application:

[0022] 1. By sliding a support frame on the machine body and installing multiple independently rotatable rolls on the support frame, each roll has ribs of different specifications. Simultaneously, a set of first protruding ribs is fixed to the inner wall of the second connecting port in the middle of the roll, and a set of second protruding ribs adapted to the first protruding ribs are fixed on the drive shaft. When producing steel bars of a specific specification, the roll corresponding to the rib specification is moved to the drive shaft by controlling the movable support frame, so that the first and second protruding ribs engage and connect. The drive shaft then drives this roll to rotate independently, while the other rolls remain stationary. This transforms the traditional method of producing a single, integral steel bar with multiple transverse ribs in a centralized manner. The roll is split into multiple shorter, independent rolls, with each specification of rib groove set independently. This reduces the actual participating mass and moment of inertia of the rotating components, decreases the driving torque requirement, and reduces operating energy consumption. It effectively reduces wear on transmission components such as bearings, improving the reliability and service life of the equipment. At the same time, since each rib groove is set on an independent roll, when a certain specification of rib groove is worn or damaged, only the corresponding roll needs to be replaced, without the need to re-grind or scrap the entire roll. This reduces maintenance costs and does not affect the production of other specifications of steel bars, improving the convenience and economy of flexible production of multiple specifications.

[0023] 2. By opening a first air passage within the drive shaft, with its inner end facing the roll at the rolling position and its outer end connected to an external cooling device, the cooling medium (such as cold air) can be directly introduced to the roll for active heat dissipation during roll operation. This effectively reduces roll temperature, minimizes roll deformation and rib wear caused by temperature rise, ensures rolling accuracy, and extends roll service life. Simultaneously, the connection between the heat dissipation air passage and the second air passage uses a flexible connecting pipe. The outer end of the connecting pipe is hemispherical, and the outer edge of the inner end of the heat dissipation air passage is a matching arc surface. When the support frame drives the roll to slide and switch, the connecting pipe can be squeezed back by the inner wall of the adjacent second connecting port. When the roll moves to the rolling position, the connecting pipe automatically pops out under the elastic force and connects with the arc surface of the corresponding second air passage on the roll. This improves the sealing of the cooling medium channel during connection, reduces leakage loss of the cooling medium, and achieves flexible separation of the connecting pipe from the roll end face during sliding switching, enhancing cooling reliability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application.

[0025] Figure 2 A schematic diagram of the support frame for the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application;

[0026] Figure 3 A schematic diagram showing the separation of the mounting frame and support frame of the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application;

[0027] Figure 4 A schematic diagram of the structure of the cold-rolled ribbed steel bar high-speed rolling mill with the mounting frame separated from the rolls provided in this application;

[0028] Figure 5 A schematic diagram of the structure of the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application, showing the separation of the drive shaft and the rolls;

[0029] Figure 6 A half-sectional schematic diagram of the rolls of the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application;

[0030] Figure 7 A schematic diagram of the first and second air passages on the drive shaft of the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application;

[0031] Figure 8 This is a schematic diagram of the structure of the high-speed rolling mill for cold-rolled ribbed steel bars provided in this application, showing that the connecting pipe is separated from the drive shaft.

[0032] The image shows:

[0033] 100. Body; 101. Frame; 102. Lead screw; 103. Drive box; 104. Slide rail;

[0034] 200. Drive shaft; 201. Second protruding ridge; 202. First air passage; 203. Second air passage; 204. Connecting pipe; 2041. Protruding ring; 205. Mounting groove; 206. Mounting plate; 2061. Connecting hole; 207. Spring;

[0035] 300, Support frame; 301, First connection port; 302, Sliding sleeve; 303, Linear groove; 304, Threaded seat; 305, Mounting bracket; 3051, U-shaped bracket; 3052, Third connection port;

[0036] 400, Roll; 401, Second connection port; 402, Rib groove; 403, First protruding ridge; 404, Heat dissipation duct; 405, Connecting part. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0038] The present invention will be further described below with reference to embodiments.

[0039] Example: Refer to Figures 1 to 8 As shown, a high-speed cold-rolled ribbed steel bar mill mainly solves the problems of large rotational inertia, high energy consumption, insufficient heat dissipation, and inconvenient maintenance caused by the concentrated opening of multiple rib grooves 402 on a single roll 400 in the prior art. Specifically, the high-speed cold-rolled ribbed steel bar mill includes a machine body 100, a frame 101 on the top of the machine body 100, a lead screw 102 rotatably mounted on the top of the frame 101, and a pair of drive shafts 200 installed inside the frame 101. The two drive shafts 200 are arranged vertically and parallel to each other. The lead screw 102 and the two drive shafts 200 are respectively installed on one side of the machine body 100. The drive box 103, which rotates on its own, is preferably a power integration unit on the machine body 100. It is generally equipped with a main drive motor and an auxiliary servo motor. The main drive motor is connected to the two drive shafts 200 through a gear reducer to provide the drive shafts 200 with the rotational torque required for rolling. The auxiliary servo motor is connected to the lead screw 102 through a worm gear or synchronous belt mechanism to drive the lead screw 102 to rotate so as to achieve the precise displacement of the support frame 300. This is a relatively mature existing technology and will not be described in detail here.

[0040] A rectangular support frame 300 is slidably installed inside the frame 101. A pair of first connection ports 301 are opened at the upper and lower ends on both sides of the support frame 300. The first connection ports 301 are through holes for the drive shaft 200 to pass through. A set of linearly arranged rollers 400 are installed at the upper and lower ends of the inner side of the support frame 300. Each set of rollers 400 is arranged sequentially along the length of the support frame 300. A second connection port 401 is opened in the middle of the roller 400. The second connection port 401 is an axial through hole that passes through the roller 400. The drive shaft 200 is located in the corresponding first connection port 301 and second connection port 401. A rib groove 402 is opened on the outer wall of each roller 400. The rib groove 402 is opened along the circumferential direction of the outer wall of the roller 400. The groove shape of the rib groove 402 corresponds to the transverse rib shape required for different specifications of cold-rolled ribbed steel bars. The specifications of each rib groove 402 increase or decrease sequentially along the axial direction to cover the production needs of multiple specifications of steel bars.

[0041] To achieve selective torque transmission between the drive shaft 200 and the roll 400, a set of first protruding ribs 403 are fixed in an annular shape at equal intervals on the inner wall of the second connection port 401. The first protruding ribs 403 extend axially along the roll 400. A set of second protruding ribs 201 are fixed in an annular shape at equal intervals on the outer side of the drive shaft 200. The second protruding ribs 201 and one of the first protruding ribs 403 are matched and engaged in a circumferential position. When the second protruding ribs 201 and the first protruding ribs 403 are in an engaged state, the torque of the drive shaft 200 can be transmitted to the corresponding roll 400 through the rib engagement, driving the roll 400 to rotate. When the second protruding ribs 201 on the drive shaft 200 are axially misaligned with the first protruding ribs 403 in a certain roll 400, the roll 400 does not rotate with the drive shaft 200.

[0042] Preferably, both ends of the first convex rib 403 and both ends of the second convex rib 201 are triangular tips. When the drive shaft 200 and the roll 400 slide axially relative to each other to achieve engagement or disengagement, the triangular tips can play a guiding and progressive engagement role, making the engagement process between the first convex rib 403 and the second convex rib 201 smoother, reducing the impact and jamming during the switching process, and improving the smoothness and reliability of specification switching.

[0043] Preferably, a set of slide rails 104 are fixed on both the upper and lower inner walls of the frame 101. Slide sleeves 302 that are adapted to the corresponding slide rails 104 are fixedly installed at the upper and lower ends of the support frame 300. The slide sleeves 302 are slidably sleeved on the slide rails 104 to realize the stable linear sliding of the support frame 300. A linear groove 303 is opened at the top of the frame 101. A threaded seat 304 that passes through the linear groove 303 and is threadedly engaged with the lead screw 102 is fixedly installed at the top of the support frame 300. When the drive box 103 drives the lead screw 102 to rotate, the threaded seat 304 moves along the axial direction of the lead screw 102, causing the support frame 300 to slide along the slide rails 104 as a whole, thereby realizing the axial alignment of the rollers 400 of different specifications with the second protrusion 201 on the drive shaft 200.

[0044] Preferably, a set of mounting brackets 305 is installed on the support frame 300. Each set of mounting brackets 305 consists of two U-shaped brackets 3051 with opposite openings. The upper and lower ends of the U-shaped brackets 3051 are provided with a third connecting port 3052 for the drive shaft 200 to pass through. The third connecting port 3052 is coaxially arranged with the first connecting port 301. Two rollers 400 are respectively installed on the upper and lower ends of the opposite sides of the two U-shaped brackets 3051. The middle of both sides of the rollers 400 has annular connecting parts 405. The U-shaped brackets 3051 are equipped with bearings adapted to the connecting parts 405 at the third connecting ports 3052, so that the rollers 400 can rotate smoothly under the drive of the drive shaft 200.

[0045] In the complete production process of cold-rolled ribbed steel bars, hot-rolled wire rod is used as raw material. It is first passively or actively fed through a wire feeding stand and then enters a descaling device to remove the surface oxide layer. After descaling, the wire rod enters a lubrication coating device, where a lubricant is applied to its surface to reduce friction and wear of the rolls 400 during subsequent rolling. Subsequently, the wire rod is fed into a cold rolling reduction mill for multi-pass reduction rolling, gradually reducing the cross-section to close to the finished diameter. The reduced wire rod enters the high-speed rolling mill in this embodiment, namely the rib forming mill, where the rib grooves 402 on the outer walls of the upper and lower rolls 400 are rolled to form the required transverse ribs on the surface of the steel bar. The rolled ribbed steel bars are drawn out by a traction device and then cut to a fixed length by a flying shear or cold shear device. Finally, they are collected in bundles by a collection rack. This is a relatively mature existing process and will not be described in detail here.

[0046] In the above process, when it is necessary to produce cold-rolled ribbed steel bars of a certain specification, the auxiliary servo motor in the drive box 103 drives the lead screw 102 to rotate, which drives the support frame 300 to slide along the slide rail 104 through the threaded seat 304, moving the roll 400 corresponding to the rib groove 402 specification to the axial position where the second protrusion 201 is located. At this time, the first protrusion 403 in the second connection port 401 of the roll 400 is axially aligned and engaged with the second protrusion 201 on the drive shaft 200. The first protrusion 403 and the second protrusion 201 of the other rolls 400 are also engaged. 201 are axially offset and do not form a transmission fit. Subsequently, the main drive motor in the drive box 103 drives the two drive shafts 200 to rotate synchronously through the gear reducer. The drive shaft 200 only drives the roll 400 in the meshing position to rotate, while the other rolls 400 remain stationary. During the rolling process, the steel bar passes between the upper and lower rolls 400. The rib groove 402 on the outer wall of the roll 400 continuously rolls the required transverse ribs on the surface of the steel bar. By controlling the matching of the rotation speed of the drive shaft 200 with the traction speed of the traction device, the precise control of the transverse rib spacing can be achieved.

[0047] By splitting the traditional single integral roll 400 with multiple rib grooves 402 into multiple shorter independent rolls 400, each rib groove 402 is independently set on its corresponding roll 400, when producing steel bars of a specific specification, only the corresponding single roll 400 needs to be driven to rotate. This reduces the actual mass and moment of inertia of the rotating components, decreases the driving torque requirement, and reduces operating energy consumption. The mechanical impact caused by inertial torque is weakened, effectively reducing the wear of transmission components such as bearings, and improving the reliability and service life of the equipment. At the same time, since each rib groove 402 is set on an independent roll 400, when a certain specification of rib groove 402 is worn or damaged, only the corresponding roll 400 needs to be replaced, without the need for grinding or scrapping the entire roll 400. This results in low maintenance costs and does not affect the production convenience of other specifications of steel bars.

[0048] Furthermore, a first air passage 202 is provided in the middle of one end of the drive shaft 200 to facilitate communication with an external cooling device (such as an air-cooled air source). Preferably, since the drive shaft 200 is in a rotating state during operation, it is connected to the external cooling device through a rotary connector (a mature existing technology, which will not be described in detail here). The outer end of the first air passage 202 is located in the middle of the end face of the drive shaft 200, and the inner end of the first air passage 202 is opposite to the corresponding roll 400. A plurality of second air passages 203 are provided in a ring at equal intervals in the middle of the drive shaft 200. The second air passages 203 are the inner end of the first air passages 202. The outer end of the second air passages 203 is opposite to the corresponding roll 400, and the inner end of the second air passages 203 is connected to the first air passages 202, so that the cooling airflow blows onto the roll 400 to cool it down.

[0049] Preferably, the side of the roll 400 is provided with a set of heat dissipation air passages 404 that are equidistantly arranged in a ring shape and correspond to the second air passage 203. The inner port of the heat dissipation air passage 404 is located inside the second connection port 401 and opposite to the second air passage 203, and the outer port of the second air passage 203 is located on one side of the rib groove 402, so that the cooling airflow can directly act on the vicinity of the rolling working surface and improve the heat dissipation efficiency.

[0050] Preferably, the second air passage 203 is located in the middle of the second protrusion 201, and a connecting pipe 204 is elastically installed at the port of the second air passage 203. The outer end of the connecting pipe 204 extending out of the second protrusion 201 is outwardly tangent to a hemispherical shape, and the outer edge of the inner port of the heat dissipation air passage 404 is an arc surface adapted to the hemispherical shape.

[0051] Preferably, the second protruding ridge 201 has a mounting groove 205 in the middle, and a mounting plate 206 is fitted and fixed in the mounting groove 205. The mounting plate 206 has a connecting hole 2061 in the middle, which corresponds to the second air passage 203. The outer edge of the end of the connecting pipe 204 has a protruding ring 2041 located inside the connecting hole 2061. The middle of the second air passage 203 has a stepped surface. A spring 207 is installed between the protruding ring 2041 and the stepped surface. Under the force of the spring 207, the connecting pipe 204 normally extends outward and abuts against the inner wall of the second connecting port 401.

[0052] When the support frame 300 slides to align the inner port of the heat dissipation duct 404 with the port of the second duct 203, the hemispherical end of the connecting pipe 204 automatically pops out and embeds into the arc surface under the force of the spring 207, forming a tight seal and realizing the connection between the second duct 203 and the heat dissipation duct 404.

[0053] During the rolling process, the external cooling device continuously supplies cooling airflow to the roll 400 through the first air passage 202, the second air passage 203, and the heat dissipation air passage 404, actively cooling the roll 400 and the rib groove 402 area to reduce the working temperature of the roll 400, reduce thermal deformation and rib groove 402 wear, and ensure rolling accuracy and roll 400 life. Preferably, the external cooling device in this embodiment can be a vortex tube cooler or a compressed air refrigeration dryer to cool and dehumidify the input cooling gas, avoiding oxidation or uneven cooling of the roll 400 surface caused by high temperature and humid gas. At the same time, a temperature sensor can be installed on the discharge side of the mill to monitor the surface temperature of the steel bar in real time and feed the temperature signal back to the control unit of the cooling device to realize closed-loop regulation of cooling airflow and temperature.

[0054] When it is necessary to switch the specification of roll 400, the support frame 300 slides, and the inner port of the heat dissipation air channel 404 disengages from the connecting pipe 204. The hemispherical end of the connecting pipe 204 retracts under the pressure of the port edge, achieving flexible disengagement. When moving to the heat dissipation air channel 404 port of the next target roll 400, the spring 207 pushes the connecting pipe 204 to pop out again and fit against the arc surface, completing the accurate docking and sealing of the cooling channel. The above structure not only ensures good alignment and sealing when the cooling medium channel is connected, but also achieves flexible disengagement of the connecting pipe 204 from the end face of the roll 400 during the sliding switching process, effectively reducing the leakage loss of the cooling medium.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A high-speed cold-rolled ribbed steel bar mill, comprising a machine body (100), a frame (101) on the top of the machine body (100), a lead screw (102) rotatably mounted on the top of the frame (101), a pair of drive shafts (200) installed inside the frame (101), and a drive box (103) on one side of the machine body (100) for respectively driving the lead screw and the two drive shafts (200) to rotate, characterized in that, A rectangular support frame (300) is slidably installed inside the frame (101). A pair of first connection ports (301) are provided at the upper and lower ends on both sides of the support frame (300). A set of linearly arranged rollers (400) are respectively installed at the upper and lower ends of the inner side of the support frame (300). A second connection port (401) is provided in the middle of the rollers (400). The drive shaft (200) is located in the corresponding first connection port (301) and second connection port (401). Ribs (402) are provided on the outer wall of each roller (400), and the specifications of each rib (402) increase or decrease sequentially along the axial direction. The inner wall of the second connection port (401) is fixed with a set of first protrusions (403) in an annular shape at equal intervals, and the outer side of the drive shaft (200) is fixed with a set of second protrusions (201) in an annular shape at equal intervals. The second protrusions (201) are adapted to and engaged with one of the sets of first protrusions (403).

2. The high-speed rolling mill for cold-rolled ribbed steel bars according to claim 1, characterized in that, The upper and lower inner walls of the frame (101) are each fixed with a set of slide rails (104). The upper and lower ends of the support frame (300) are respectively fixed with slide sleeves (302) that are adapted to the corresponding slide rails (104). The top of the frame (101) is provided with a linear slot (303). The top of the support frame (300) is fixed with a threaded seat (304) that passes through the linear slot (303) and is threaded with the lead screw (102).

3. A high-speed cold-rolled ribbed steel bar mill according to claim 2, characterized in that, A set of mounting brackets (305) is installed on the support frame (300). Each set of mounting brackets (305) consists of two U-shaped brackets (3051) with opposite openings. The upper and lower ends of the U-shaped brackets (3051) are provided with a third connection port (3052) for the drive shaft (200) to pass through. The two opposite rollers (400) are respectively installed on the upper and lower ends of the two U-shaped brackets (3051) on opposite sides.

4. A high-speed cold-rolled ribbed steel bar mill according to claim 3, characterized in that, The roll (400) has annular connecting parts (405) in the middle of both sides, and a bearing adapted to the connecting parts (405) is installed on the U-shaped frame (3051) at the third connecting port (3052).

5. A high-speed cold-rolled ribbed steel bar mill according to claim 4, characterized in that, A first air passage (202) is provided at the middle of one end of the drive shaft (200). The outer end port of the first air passage (202) is located at the middle position of the end face of the drive shaft (200), and the inner end port of the first air passage (202) is opposite to the corresponding roller (400).

6. A high-speed cold-rolled ribbed steel bar mill according to claim 5, characterized in that, The drive shaft (200) has a plurality of second air passages (203) arranged in a ring at equal intervals in the middle. The outer port of the second air passage (203) is opposite to the corresponding roller (400), and the inner port of the second air passage (203) is connected to the first air passage (202).

7. A high-speed cold-rolled ribbed steel bar mill according to claim 6, characterized in that, The side of the roll (400) is provided with a set of heat dissipation air passages (404) that are equidistant from each other in a ring shape and correspond to the second air passage (203). The inner port of the heat dissipation air passage (404) is located inside the second connection port (401) and is opposite to the second air passage (203). The outer port of the second air passage (203) is located on one side of the rib groove (402).

8. A high-speed cold-rolled ribbed steel bar mill according to claim 7, characterized in that, The second air passage (203) is located in the middle of the second protrusion (201). A connecting pipe (204) is elastically installed at the port of the second air passage (203). The second protrusion (201) extending outward from the outer end of the connecting pipe (204) is circumferentially hemispherical. The outer edge of the inner port of the heat dissipation air passage (404) is an arc surface that matches the hemispherical shape.

9. A high-speed cold-rolled ribbed steel bar mill according to claim 8, characterized in that, The second protruding ridge (201) has a mounting groove (205) in the middle, and a mounting plate (206) is fitted and fixed in the mounting groove (205). The mounting plate (206) has a connecting hole (2061) in the middle corresponding to the second air passage (203). The outer edge of the end of the connecting pipe (204) has a protruding ring (2041) located inside the connecting hole (2061). The second air passage (203) has a stepped surface in the middle, and a spring (207) is installed between the protruding ring (2041) and the stepped surface.

10. A high-speed cold-rolled ribbed steel bar mill according to claim 9, characterized in that, Both ends of the first protruding ridge (403) and both ends of the second protruding ridge (201) are triangular cusps.

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