Pneumatic control system and process for pinch roll in high-speed wire rod rolling process

Abstract

The invention discloses a pinch roll pneumatic control system and process in a high-speed wire rod rolling process. A high-speed wire rod sequentially enters a reducing mill unit, a water tank, a pinch roll and a silking machine along a rolling center line; a pinch roll cylinder is arranged on the pinch roll and is used for adjusting the clamping force and the size of a roll gap; and a connecting pipeline of the pinch roll cylinder is provided with a first stop valve, an air source triple piece, a second stop valve, a pneumatic proportioning valve, an electromagnetic valve and a throttle valve which are controlled by the PLC. The pinch roll can be suitable for most high-speed wire rod production lines, the clamping force of the pinch roll can be flexibly applied, the product requirements of different precisions are met, the roll gap in the pinch roll is easy and convenient to adjust, and the process combination application is flexible. The size cleaning performance of a final product is improved, the yield is improved, the accident post-treatment time in the area is shortened, the fault treatment time in the production process is shortened, the operation rate of a rolling mill is improved, and the income is increased.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed metal wire rolling, and in particular to a pneumatic control system and process for pinch rollers in a high-speed wire rolling process. Background Art

[0002] With the fierce competition in the metallurgical industry product market, users have continuously improved their requirements for the performance and quality of wire products. High-speed wire production lines have become more and more stringent in controlling the quality of finished products, especially in the pinch rollers in front of the laying head that control the coil shape of the wire tail and the steel stacking after the finished product. The pinch rollers controlled by traditional cylinders have problems such as instability and poor coil shape, which not only affects the appearance performance of the finished product, but also makes it difficult to collect the coils and reduces production efficiency.

[0003] Traditional pinch rollers rely on bolts to adjust the maximum and minimum roll gaps, and mechanical limits are used to control the opening and adjustment of the clamping roll gap. When adjusting the clamping roll gap, it is necessary to use a feeler gauge or sample bar to perform repeated calibrations to avoid problems such as being unable to clamp a large roll gap or being flattened when the roll gap is small. At the same time, this clamping effect can only be identified after the product has passed the steel smoothly, and often multiple adjustments are required for successful calibration. This method is difficult to adjust, has low accuracy, and poor reliability, which seriously affects production efficiency.

[0004] The dimensions of rolled pieces fluctuate during the steel rolling process, and the roll gap adjusted with a fixed value does not meet the clamping requirements of the fluctuating rolled pieces. According to the different process requirements of rolled pieces, some require clamping head, clamping tail, full-process clamping or combined application, and the clamping strength has different requirements. The clamping force and roll gap of traditional pinch rollers are difficult to adapt to modern process production processes. Summary of the invention

[0005] The purpose of the present invention is to provide a pneumatic control system and process for pinch rollers in a high-speed wire rolling process, improve the pneumatic control of pinch rollers in front of a laying head, and greatly improve the stability of the finished product by stabilizing the air pressure balance, so as to solve the problems raised by the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A pneumatic control system for pinch rollers in a high-speed wire rolling process comprises a reducing mill unit, a water tank, pinch rollers and a laying head. The high-speed wire enters the reducing mill unit along the rolling center line and passes through the water tank, pinch rollers and laying head in sequence. The pinch rollers are equipped with pinch roller cylinders for adjusting the clamping force and the size of the roller gap. The connecting pipeline of the pinch roller cylinder is provided with a first stop valve, an air source triplet, a second stop valve, a pneumatic proportional control valve, a solenoid valve and a throttle valve. The compressed air of the main pipe enters the air source triplet after passing through the first stop valve, passes through the second stop valve after voltage stabilization, a pneumatic proportional control valve is arranged after the second stop valve, and a solenoid valve is arranged after the pneumatic proportional control valve. The solenoid valve is used to control the closing and opening of the main pipe. Throttle valves are respectively arranged on the branch pipes after the solenoid valve, and the branch pipes are connected to the pinch roller cylinder.

[0008] Furthermore, the working states of the pneumatic proportional control valve and the solenoid valve are controlled by the PLC, and the solenoid valve is controlled by the PLC to open the air source. The current of the pneumatic proportional control valve is adjusted at any time according to the rolling process to adjust the response speed and the opening size.

[0009] Furthermore, the first stop valve and the second stop valve can be manually controlled to open and close, and during the production process, the first stop valve and the second stop valve are both in a long-term open state.

[0010] Furthermore, the pinch roller is equipped with two tungsten carbide roller rings, which are driven by an AC variable frequency motor and have circular holes. The tungsten carbide roller rings can be clamped and opened for clamping the rolled piece under the drive of the pinch roller cylinder.

[0011] Furthermore, the pinch roller is butted against the laying head through a pinch roller guide and a combined guide plate.

[0012] Furthermore, the pinch roller guide is divided into an entrance guide and an exit guide. The entrance guide is used to guide the rolled piece into the clamping groove, and the exit guide is used to change the running direction of the rolled piece to bend downward at a certain angle to match the inclination angle of the spinning machine, and cooperate with the combined guide plate to smoothly deliver the rolled piece to the spinning machine and subsequent working areas.

[0013] The present invention provides another technical solution: a pneumatic control process for pinch rollers in a high-speed wire rolling process, which is implemented based on a pneumatic control system for pinch rollers in a high-speed wire rolling process, and includes the following steps:

[0014] S1: In the high-speed wire production line, the incoming wire enters the water tank after being rolled by the reducing mill unit, and then enters the pinch roller;

[0015] S2: The compressed air in the pneumatic control of the pinch roller cylinder enters the air source triplex after passing through the first stop valve, and after the pressure is stabilized, it passes through the second stop valve, the pneumatic proportional control valve and the solenoid valve in sequence;

[0016] S3: When the pinch roll is working, the PLC controls the solenoid valve to open the air source, adjusts the clamping force of the pneumatic proportional control valve and the roll gap size at any time according to the rolling process, and manually adjusts the opening and closing degree of the throttle valve;

[0017] S4: Finally, it enters the spinning machine through the pinch roller guide and the combined guide plate to start spinning and subsequent work.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The pneumatic control system and process of the pinch rollers in the high-speed wire rolling process of the present invention can provide a stable pulling force to the rolled piece, prevent the rolled piece from shaking in the water tank, and prevent the rolled piece from slipping, reduce indentations, and improve the quality of the finished product.

[0020] 2. The pneumatic control system and process of the pinch rollers in the high-speed wire rolling process of the present invention controls the coil shape of the tail of the wire by controlling the speed of entering the wire laying head; the adjustment of the roller gap in the pinch rollers is simple and convenient, and the process combination application is flexible, which can meet the requirements of products with different precisions, improve the operation rate of the rolling mill, improve production efficiency, and increase profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the pneumatic principle circuit diagram of the pinch roller of the present invention;

[0022] Figure 2 It is a schematic diagram of the simplified structure of the pinch roller and the laying head of the present invention;

[0023] Figure 3 This is a high-speed wire rolling process circuit diagram of the present invention.

[0024] In the figure: 1. reducing mill unit; 2. water tank; 3. pinch roller; 301. first stop valve; 302. air source triplex; 303. second stop valve; 304. pneumatic proportional control valve; 305. solenoid valve; 306. throttle valve; 307. pinch roller cylinder; 308. tungsten carbide roller ring; 309. pinch roller guide; 310. combined guide plate; 4. spinning machine. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-3In the embodiment of the present invention, a pneumatic control system for pinch rollers in the high-speed wire rolling process is provided, including a reducing mill unit 1, a water tank 2, pinch rollers 3 and a spinning machine 4. The high-speed wire enters the reducing mill unit 1 along the rolling center line, and passes through the water tank 2, the pinch rollers 3 and the spinning machine 4 in sequence; wherein, the reducing mill unit 1 selected is a domestically produced 45° top-crossed two-roller reducing mill unit, with a total of 2 racks. The domestically produced reinforced roller ring mill can realize free-size rolling, low-temperature rolling and single-hole rolling, and can obtain very high product size accuracy. The spinning machine 4 is a horizontal low-inertia spinning machine with a high-wire head positioning control function, which can stably form a coil of a predetermined diameter from the high-speed linear motion high-wire and drop it into the loose coil cooling and transportation line.

[0027] The pinch roller 3 in this embodiment is equipped with a pinch roller cylinder 307 for adjusting the clamping force and the size of the roller gap; the connecting pipeline of the pinch roller cylinder 307 is provided with a first stop valve 301, an air source triplet 302, a second stop valve 303, a pneumatic proportional control valve 304, a solenoid valve 305 and a throttle valve 306, and the compressed air of the main pipe enters the air source triplet 302 after passing through the first stop valve 301, and passes through the second stop valve 303 after voltage stabilization, wherein the first stop valve 301 and the second stop valve 303 can be manually controlled to open and close, and the first stop valve 301 and the second stop valve 303 are both in a long-term open state during the production process; a pneumatic proportional control valve 304 is arranged behind the second stop valve 303, and the pneumatic proportional control valve 304 is arranged behind the second stop valve 303. The working state of the throttle valve 304 is controlled by PLC. The current is adjusted by PLC to adjust the response speed and the opening size, so as to adjust the roll gap and clamping force at any time without stopping the steel feeding. The adjustment range of the clamping force is 1.5-5KN. A solenoid valve 305 is arranged behind the pneumatic proportional control valve 304. The solenoid valve 305 is used to control the closing and opening of the main pipe. Throttle valves 306 are arranged on the branch pipes behind the solenoid valve 305. The opening and closing size of the throttle valve 306 is manually adjusted. The adjustment of the pressing amount of the entire upper roll is controlled by PLC, that is, when the pinch roll 3 is working, the PLC controls the solenoid valve 305 to open the air source, and adjusts the clamping force and roll gap size of the pneumatic proportional control valve 304 at any time according to the rolling process.

[0028] like Figure 2 As shown, the pinch roller 3 in this embodiment is equipped with two tungsten carbide roller rings 308, which are driven by an AC variable frequency motor. The hole type adopts a circular hole, which is not easy to produce indentation defects. The tungsten carbide roller ring 308 can be clamped and opened under the drive of the pinch roller cylinder 307 to clamp the workpiece, so as to reduce the vibration of the workpiece, smoothly send the tail of the workpiece out of the wire laying machine 4, make the tail ring size appropriate, and reduce the steel piling in the finishing rolling and sizing reduction.

[0029] exist Figure 2In this embodiment, the pinch roller 3 and the spinning head 4 are connected through the pinch roller guide 309 and the combined guide plate 310. The pinch roller guide 309 is divided into an entrance guide and an exit guide. The entrance guide is used to guide the rolled piece into the clamping groove, and the exit guide is used to change the running direction of the rolled piece to bend downward at a certain angle to match the inclination angle of the spinning head 4, and cooperate with the combined guide plate 310 to smoothly deliver the rolled piece to the spinning head 4 and the subsequent working area.

[0030] In order to further better explain the above embodiment, the present invention also provides a pneumatic control process for pinch rolls in a high-speed wire rolling process, comprising the following steps:

[0031] S1: In the high-speed wire production line, the incoming wire enters the water tank 2 after being rolled by the reducing mill unit 1, and then enters the pinch roller 3;

[0032] S2: The compressed air in the pneumatic control of the pinch roller cylinder 307 passes through the first stop valve 301 and enters the air source triplex 302. After the pressure is stabilized, it passes through the second stop valve 303, the pneumatic proportional control valve 304 and the solenoid valve 305 in sequence;

[0033] S3: When the pinch roll 3 is working, the PLC controls the solenoid valve 305 to open the air source, adjusts the clamping force and roll gap size of the pneumatic proportional control valve 304 at any time according to the rolling process, and manually adjusts the opening and closing size of the throttle valve 306;

[0034] S4: Finally, the wire enters the spinning machine 4 through the pinch roller guide 309 and the combined guide plate 310 to start spinning and subsequent work.

[0035] Based on the above control system and process, the present invention also provides a partial production process of high-speed wire, specific implementation mode 1: the process production steps are:

[0036] S1: The whole rolling process adopts continuous twist-free rolling, with two special final rolling passes, two reducing mills, the finished product size is RB 8.0mm, and the final rolling temperature is 820-850℃.

[0037] S2: After rolling, water tank 2 opens water tank 3 to control the surface temperature of the rolled piece to be not less than 550°C and deliver it to laying machine 4 through pinch roller 3 within 3 seconds.

[0038] S3: In order to avoid the jitter of the rolled piece and the accumulation of steel in the finished product box, reduce the wear of the nozzle and the guide groove in the water tank 2, ensure that the rolled piece jitters in the nozzle, and ensure that the rolled piece is cooled evenly on the same cross section, the full-process pinching mode is adopted. At this time, the nominal roll gap (the maximum roll gap opened by the pinch roller 3) is 2mm. When the heat detection in front of the pinch roller 3 detects the head of the rolled piece, the pinch roller cylinder 307 drives the pinch roller 3 to close. At this time, the minimum roll gap is 1mm. At this time, the clamping force is automatically adjusted to 1.5KN through the pneumatic proportional control valve 304. During the rolling process, the roll gap changes with the steel diameter according to the fluctuation of the rolled piece size, ensuring that the roll gap moves with the material and can be clamped without being flattened.

[0039] S4: When the thermal inspection detects that the tail of the rolled piece leaves the pinch roller 3, the roller gap returns to the open position.

[0040] Specific implementation method 2: The process production steps are:

[0041] S1: The whole rolling process adopts continuous twist-free rolling, with two special final rolling passes, two reducing mills, the finished product size is RB16.0 mm, and the final rolling temperature is 850-880℃.

[0042] S2: rolling speed is 24.7 m / s, and the wire is sent to the laying head 4 via the pinch roller 3;

[0043] S3: Due to the low rolling speed, the pinch roller 3 needs to accelerate the clamping of the rolled piece after it leaves the finished product stand to ensure that the rolled piece can be smoothly spun into a coil, and the clamping tail mode is adopted. At this time, the nominal roll gap (the maximum roll gap opened by the pinch roller 3) is 5mm. When the heat inspection detects that the rolled piece leaves the sizing mill, the pinch roller cylinder 307 drives the pinch roller 3 to close. At this time, the minimum roll gap is 3.5mm. At this time, the clamping force is automatically adjusted to 5KN through the pneumatic proportional control valve 304. During the rolling process, the roll gap changes with the steel diameter according to the fluctuation of the rolled piece size, ensuring that the roll gap moves with the material and can be clamped without being flattened. When the tail completely leaves the pinch roller 3, the roll gap returns to the open position.

[0044] S4: When the heat detection detects that the tail of the rolled piece leaves the pinch roller 3, the roller gap returns to the open position.

[0045] In summary: The pneumatic control system and process of the pinch rollers in the high-speed wire rolling process provided by the present invention are suitable for wire products with product specifications of Φ5.0-25.0mm, and are suitable for most high-speed wire production lines. The clamping force of the pinch roller 3 can be flexibly used to meet product requirements of different precisions. The application of the present invention increases the stability of the product, provides a stable pulling force to the rolled piece, and prevents the rolled piece from shaking in the water tank 2. At the same time, it prevents the rolled piece from slipping, reduces indentations, and improves the quality of the finished product; by controlling the speed of entering the spinning machine 4, the ring shape of the wire tail is controlled; the roller gap adjustment in the pinch roller 3 is simple and convenient, and the process combination is flexible. The size of the final product is improved, the yield rate is improved, the post-accident processing time in the area is reduced, the fault processing time in the production process is reduced, the mill operation rate is improved, and the profit is increased.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pneumatic control system for pinch rolls in a high-speed wire rolling process, characterized in that: The invention comprises a reducing mill unit (1), a water tank (2), a pinch roller (3) and a laying head (4); the high-speed wire rod enters the reducing mill unit (1) along the rolling center line and passes through the water tank (2), the pinch roller (3) and the laying head (4) in sequence; the pinch roller (3) is equipped with a pinch roller cylinder (307) for adjusting the clamping force and the roll gap size; the connecting pipeline of the pinch roller cylinder (307) is provided with a first stop valve (301), an air source triplet (302), a second stop valve (303), a pneumatic proportional control valve (304), The electromagnetic valve (305) and the throttle valve (306) are provided. The compressed air of the main pipe passes through the first stop valve (301) and enters the air source triplex (302). After the pressure is stabilized, the compressed air passes through the second stop valve (303). A pneumatic proportional control valve (304) is provided after the second stop valve (303). A electromagnetic valve (305) is provided after the pneumatic proportional control valve (304). The electromagnetic valve (305) is used to control the closing and opening of the main pipe. Throttle valves (306) are respectively provided on the branch pipes after the electromagnetic valve (305). The branch pipes are connected to the pinch roller cylinder (307).

2. A pneumatic control system for pinch rolls in a high-speed wire rolling process as claimed in claim 1, characterized in that: The working states of the pneumatic proportional control valve (304) and the electromagnetic valve (305) are controlled by the PLC, and the electromagnetic valve (305) is controlled by the PLC to open the air source. The current of the pneumatic proportional control valve (304) is adjusted at any time according to the rolling process to adjust the response speed and the opening size.

3. A pneumatic control system for pinch rolls in a high-speed wire rolling process as claimed in claim 1, characterized in that: The first stop valve (301) and the second stop valve (303) can both be manually controlled to open and close, and during the production process, the first stop valve (301) and the second stop valve (303) are both in a long-term open state.

4. A pneumatic control system for pinch rolls in a high-speed wire rolling process as claimed in claim 1, characterized in that: The pinch roller (3) is provided with two tungsten carbide roller rings (308), which are driven by an AC variable frequency motor and have circular holes. The tungsten carbide roller rings (308) can be clamped and opened for clamping the rolled piece under the drive of the pinch roller cylinder (307).

5. A pneumatic control system for pinch rolls in a high-speed wire rolling process as claimed in claim 1, characterized in that: The pinch roller (3) and the laying head (4) are butted against each other via a pinch roller guide (309) and a combined guide plate (310).

6. A pneumatic control system for pinch rolls in a high-speed wire rolling process as claimed in claim 5, characterized in that: The pinch roller guide (309) is divided into an entry guide and an exit guide. The entry guide is used to guide the rolled piece into the clamping groove, and the exit guide is used to change the running direction of the rolled piece and bend downward at a certain angle to match the inclination angle of the spinning machine (4), and cooperate with the combined guide plate (310) to smoothly send the rolled piece to the spinning machine (4) and the subsequent working area.

7. A pneumatic control process for pinch rolls in a high-speed wire rolling process, implemented based on a pneumatic control system for pinch rolls in a high-speed wire rolling process according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: In a high-speed wire production line, the incoming wire enters a water tank (2) after being rolled by a reducing mill unit (1), and then enters a pinch roller (3); S2: The compressed air in the pneumatic control main pipe in the pinch roller cylinder (307) passes through the first stop valve (301) and then enters the air source triplex (302). After the pressure is stabilized, it passes through the second stop valve (303), the pneumatic proportional control valve (304) and the solenoid valve (305) in sequence; S3: When the pinch roller (3) is working, the PLC controls the solenoid valve (305) to open the air source, adjusts the clamping force and the roll gap size of the pneumatic proportional control valve (304) at any time according to the rolling process, and manually adjusts the opening and closing size of the throttle valve (306); S4: Finally, the silk enters the spinning machine (4) through the pinch roller guide (309) and the combined guide plate (310) to start spinning and subsequent work.

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