A method and improved structure for accurately controlling the length allowance of threaded steel

Abstract

This application relates to a method and improved structure for precisely controlling the length allowance of rebar, and relates to the technical field of rebar production. To address the issue of cooling shrinkage being affected by temperature differences before and after shearing, the method includes recording climate (temperature), rebar specifications, and length; measuring the corresponding temperatures during shearing of each section of a cold shear and the shrinkage of the rebar before and after cooling; creating a corresponding table and drawing a corresponding shrinkage trend chart; determining a set shrinkage value; calculating the shrinkage difference between different temperature intervals; and designing an additional plate to compensate for minor sizing of the rebar. The rebar is sheared by a cold shear, and the temperature at the shearing point is measured to determine whether the shearing temperature requires compensation for minor sizing. If compensation is not necessary, the additional plate is not required. If compensation is required, the additional plate is placed at the material end of the rebar, shortening the extended length of the rebar during shearing. This application has significant economic benefits.

Description

Technical Field

[0001] The present application relates to the technical field of threaded steel production, and in particular to a method and an improved structure for accurately controlling the length allowance of threaded steel. Background Art

[0002] The national standard for rebar requires two fixed lengths: 12m and 9m. In addition, there are some customer-customized lengths such as 11.3, 10.6m, etc., which are called non-standard fixed lengths. Most production revolves around fixed lengths.

[0003] The newly built production line has a fast pace and a strong cooling bed reserve capacity. The interval from throwing the rebar to shearing with the cold shear is about 20 minutes. During this period, the temperature drops from 880-930℃ to 260-330℃.

[0004] However, in reality, since shearing is carried out in sections, there is a difference in temperature between the front and rear sections of the rebar. This temperature difference leads to a difference in the amount of cooling shrinkage. In theory, the higher the temperature during shearing, the greater the shrinkage, and the lower the temperature, the less the shrinkage. For manufacturers, the closer the length after cooling to room temperature is to the corresponding length of the fixed length, the greater the benefit. When the length after cooling to room temperature is too different from the corresponding length of the fixed length, it will be judged as scrap (short length). Summary of the Invention

[0005] In order to solve the problem that the temperature difference between the front and rear sections of sheared rebar affects the cooling shrinkage, the present application provides a method and an improved structure for accurately controlling the length allowance of rebar.

[0006] The present application provides a method for accurately controlling the length allowance of threaded steel bars and an improved structure using the following technical solutions:

[0007] A method for accurately controlling the length allowance of threaded steel bars comprises the following steps:

[0008] S1. Record the climate (temperature), rebar specifications and length, and measure the corresponding temperatures during shearing at each section of the cold shear under these conditions, as well as the shrinkage of the rebar before and after cooling.

[0009] S2. Prepare a corresponding table to record the specific shrinkage values ​​of the rebar under different temperatures of the cold shearing machine, and draw a corresponding shrinkage trend chart;

[0010] S3. Analyze and determine the shrinkage value. Through a large amount of data recording and analysis, the corresponding shrinkage value of rebar of the same specification and length in each temperature range;

[0011] S4. Calculate the shrinkage difference between different temperature ranges for rebars of the same specification and length;

[0012] S5. Improve the fixed-length baffle by adding an additional plate to it. The thickness of the additional plate is the difference in shrinkage, which can compensate for the slight size of the fixed-length baffle.

[0013] S6. Retrieve the corresponding data of climate temperature and rebar shrinkage, arrange the fixed-length baffle at the appropriate position of the roller conveyor, and at this time, the attached plate does not provide slight size compensation for the fixed-length baffle, and the cold shear cuts the rebar;

[0014] S7. Measure the temperature of the cold shearing machine at the cold shearing position to determine whether the cold shearing temperature needs to compensate for the micro size;

[0015] S8. If it is determined that the micro size does not need to be compensated, there is no need to arrange the corresponding additional plate;

[0016] S9. Returning to the above step S7, when it is determined that a slight size needs to be compensated, an additional plate is arranged at the material-blocking end of the fixed-length baffle to shorten the extended length of the threaded steel bar during shearing.

[0017] By adopting the above technical solution, the shrinkage of rebars of various specifications and lengths at different temperatures is obtained based on statistical analysis of a large amount of data, and the shrinkage difference is calculated and compensated by using the corresponding attached plates, thereby achieving precise control of the rebar length allowance, thereby reducing the loss of rebar allowance. It is calculated that a 1cm allowance loss affects the finished product by 0.1% for 9m fixed lengths of various specifications, and affects the finished product by 0.08% for 12m fixed lengths of various specifications. For a steel mill with an annual output value of more than 10 million tons, this difference can bring significant economic benefits.

[0018] Furthermore, the temperature recorded value in step S1 is measured by a temperature measuring instrument next to the cold shearing machine to obtain temperature data.

[0019] By adopting the above technical solution, the temperature recording value of the cold shear is measured by using a temperature measuring instrument, which ensures the stability of the measurement and high accuracy. It can adapt to different measurement needs, and the measured data is diversified and has a wide range of uses and good adaptability.

[0020] Furthermore, in step S2, the shrinkage of the threaded steel bars of the same specification and length under different climate temperatures is the same, and the effect of climate temperature on the shrinkage of the threaded steel bars is close to zero.

[0021] By adopting the above technical solution and recording the shrinkage of rebars of various specifications under different climate temperatures, it was found that the climate temperature has almost no effect on the shrinkage.

[0022] Furthermore, in step S3, through a large amount of data analysis, it is found that the shrinkage of the rebar of the same specification and length is the largest during the initial cold shearing, and the shrinkage of the rebar remains at an average shrinkage value until the cold shearing temperature approaches a certain temperature range.

[0023] Furthermore, through a large amount of data analysis in step S3, it is also concluded that for rebars of the same specification, under the same shearing temperature, the longer the rebar is after shearing, the greater the shrinkage.

[0024] Furthermore, the thickness of the additional plate in step S5 is the difference between the maximum shrinkage value and the average shrinkage value of the threaded steel bars of the same specification and length.

[0025] Furthermore, after the thickness of the attached plate is determined in step S5, the thickness of the attached plate can be adjusted by shearing to reserve a corresponding margin thickness.

[0026] Furthermore, in step S6, the distance between the fixed-length baffle and the shearing position of the cold shear is the fixed-length length of the rebar plus the maximum shrinkage.

[0027] Furthermore, in step S6, the distance between the fixed-length baffle and the shearing position of the cold shear is the fixed-length length of the rebar plus the maximum shrinkage.

[0028] An improved structure for accurately controlling the length allowance of threaded steel bars comprises a length baffle, an auxiliary plate for compensating for shrinkage is provided on one side of the length baffle, a slide rail structure is installed between the length baffle and the auxiliary plate, the slide rail structure comprises two tracks and a cylinder, the two tracks are respectively arranged on both sides in the length direction of the length baffle, and the tracks are arranged along the width direction of the length baffle, the two ends of the auxiliary plate are respectively slidably connected in the two tracks, the output end of the cylinder is arranged towards the track direction, and the output end of the cylinder and the auxiliary plate are detachably arranged.

[0029] By adopting the above technical solution, when the cold shearing machine is shearing the rebar, when the temperature measuring instrument determines that the micro-size needs to be compensated at the current cold shearing temperature, the cylinder starts to work after receiving the temperature signal at the cold shearing point. At this time, the auxiliary plate is slidably connected in the tracks on both sides until one end of the auxiliary plate abuts on the roller. At this time, the auxiliary plate adjusts the distance between the fixed-length baffle and the cold shearing machine to adjust the shrinkage amount of the rebar; through the arrangement of the auxiliary plate, the slide rail and the cylinder, the structure is simple and the operation is convenient, and the fixed-length allowance of the rebar is accurately adjusted.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] Based on a large amount of statistical data analysis, the shrinkage of rebar of various specifications and lengths at different temperatures is obtained. The shrinkage difference is calculated and compensated by using the corresponding attached plates to achieve precise control of the rebar length allowance, thereby reducing the loss of rebar allowance. Through measurement, it is found that a 1cm allowance loss affects the yield of 0.1% for 9m fixed length of various specifications, and 0.08% for 12m fixed length of various specifications. For a steel mill with an annual output value of more than 10 million tons, this difference can bring significant economic benefits.

[0032] The temperature recording value of the cold shear is measured by temperature measuring instruments to ensure the stability of the measurement, high accuracy, and can adapt to different measurement needs. The measured data is diversified and has a wide range of uses and good adaptability.

[0033] Through the setting of the auxiliary plate, the slide rail and the cylinder, the structure is simple and the operation is convenient, and the length allowance of the threaded steel bar can be accurately adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a record summary chart of a method for accurately controlling the length allowance of threaded steel in an embodiment of the present application.

[0035] Figure 2 This is a table diagram used in the embodiment of the present application to reflect the changes in shrinkage of the same specification under different climate temperatures.

[0036] Figure 3 This is a table used in the embodiments of the present application to reflect the shrinkage of threaded steel of the same specification in different temperature ranges.

[0037] Figure 4 This is the shrinkage trend chart of a 16*4 specification 12m fixed length.

[0038] Figure 5 This is the shrinkage trend chart of a 9m fixed length 22*2 specification.

[0039] Figure 6 This is the shrinkage trend chart of a 12m fixed length 22*2 specification.

[0040] Figure 7 This is a schematic diagram of a modified machine structure for accurately controlling the length allowance of threaded steel in an embodiment of the present application.

[0041] Explanation of the accompanying symbols: 1. Roller; 2. Cold shear; 3. Fixed-length baffle; 4. Attached plate; 5. Slide rail structure; 51. Track; 52. Cylinder. Implementation Method

[0042] In order to elaborate on the technical solutions adopted by the present invention to achieve the predetermined technical purpose, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments, and the technical means or technical features in the embodiments of the present invention can be replaced without creative work. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0043] The following is combined with Figure 1-6 This application is described in further detail.

[0044] As attached Figure 1-6 As shown, the embodiment of the present application discloses a method for accurately controlling the length allowance of threaded steel bars, comprising the following steps:

[0045] S1. Record the climate (temperature), rebar specifications, and length. Measure the corresponding temperatures during shearing at each section of the cold shear under these conditions, as well as the shrinkage of the rebar before and after cooling. Use a temperature measuring instrument to obtain temperature data for each section of the cold shear. The temperature measuring instrument uses infrared, thermal imaging, and other methods for precise measurement to ensure the accuracy of the measured temperature data.

[0046] S2. Make a corresponding table to record the specific shrinkage values ​​of threaded steel at different temperatures of the cold shear machine, as shown in the attached table. Figure 1 , Attachment Figure 2 and attached Figure 3 As shown in the figure, it can be concluded that the shrinkage of threaded steel with the same specification and length is the same under different climate temperatures, and the effect of climate temperature on the shrinkage of threaded steel tends to zero. The corresponding shrinkage trend graph is drawn as shown in the attached figure. Figure 4 , Attachment Figure 5 and attached Figure 6 As shown;

[0047] S3. Analyze and determine the shrinkage value. Through a large amount of data record analysis, it is found that the shrinkage of rebars of the same specification and length is the largest during the initial cold shearing, and the shrinkage of the rebar remains at an average shrinkage value until the cold shearing temperature approaches a certain temperature range. At the same time, for rebars of the same specification, under the same shearing temperature, the longer the finished length of the rebar after shearing, the greater the shrinkage of the rebar;

[0048] S4. Calculate the shrinkage difference between different temperature ranges for rebars of the same specification and length;

[0049] S5. Improve the fixed-length baffle and add an additional plate to it. The thickness of the additional plate is the shrinkage difference. The shrinkage difference is the maximum shrinkage value of the fixed-length rebar product and the average shrinkage value after the shrinkage in the subsequent cold shearing process tends to be stable. This can compensate for the micro-size of the fixed-length baffle.

[0050] Since the delivered size of the fixed-length rebar cannot be lower than the marked size, after the thickness of the attached plate is determined in this embodiment, the thickness of the attached plate can be sheared and adjusted to reserve a corresponding excess thickness. In this embodiment, the excess thickness can be changed according to actual conditions to ensure the qualified rate of the finished fixed-length rebar products, reduce the possibility of defective fixed-length rebar products, ensure economic efficiency, and reduce economic losses.

[0051] S6. Retrieves the corresponding data of climate temperature and rebar shrinkage, arranges the fixed-length baffle at the appropriate position of the roller conveyor, and adjusts the distance between the fixed-length baffle and the shearing position of the cold shear to the fixed-length length of the rebar + the maximum shrinkage. At this time, the attached plate does not provide slight dimensional compensation for the fixed-length baffle, and the cold shear shears the rebar.

[0052] S7. Measure the temperature of the cold shearing machine at the cold shearing position to determine whether the cold shearing temperature needs to compensate for the micro size;

[0053] S8. If it is determined that the micro size does not need to be compensated, there is no need to arrange the corresponding additional plate;

[0054] S9. Returning to the above step S7, when it is determined that a slight size needs to be compensated, an additional plate is arranged at the material-blocking end of the fixed-length baffle to shorten the extended length of the threaded steel bar during shearing.

[0055] The present invention will be further described below through specific examples.

[0056] Example 1: When producing 12m fixed length with specifications of 16*4

[0057] The present application discloses a method for accurately controlling the length allowance of threaded steel bars, comprising the following steps:

[0058] S1. Record the climate (temperature), rebar specifications and length. Use a temperature measuring instrument to measure the corresponding temperature of each section of the cold shear under these conditions and the shrinkage of the rebar before and after cooling.

[0059] S2. Prepare a corresponding table to record the specific shrinkage values ​​of the rebar under different temperatures of the cold shearing machine, and draw a corresponding shrinkage trend chart;

[0060] S3. Analyze and determine the shrinkage constant value. Through a large amount of data record analysis, the shrinkage of the 12m fixed length 16*4 steel bar is 3.5cm when the temperature range is 330-340°C, which is the maximum shrinkage value. The shrinkage of the steel bar is 3.1cm when the temperature range is 290-330°C, and the shrinkage value begins to gradually decrease. When the temperature range reaches 265-290°C, the shrinkage value of the steel bar tends to be stable and the shrinkage remains at 3.0cm. During normal rolling, the temperature range is maintained between 265-340°C.

[0061] S4. Calculate the shrinkage difference between different temperature ranges for rebars of the same specification and length;

[0062] S5. Improve the fixed-length baffle and add an additional plate to it. The thickness of the additional plate is 0.50 cm, which is the difference between the maximum shrinkage of the finished fixed-length rebar (3.5 cm) and the average shrinkage of 3.0 cm after the shrinkage in the subsequent cold shearing process stabilizes. This can compensate for the micro-size of the fixed-length baffle.

[0063] Since the delivery size of the fixed-length rebar cannot be less than the marked size of 12m, in this embodiment, after the thickness of the attached plate is determined, the thickness of the attached plate can be sheared and adjusted to reserve a corresponding margin thickness. The margin thickness can be retained to 0.10cm. At this time, the thickness of the attached plate is 0.40cm, which is used to ensure the qualified rate of the finished fixed-length rebar products, reduce the possibility of unqualified fixed-length rebar products, ensure economic efficiency, and reduce economic losses.

[0064] S6. Retrieved the corresponding data of climate temperature and rebar shrinkage, placed the cut-length baffle at the appropriate position of the roller conveyor, and adjusted the distance between the cut-length baffle and the shearing position of the cold shear to 12.035m (the cut-length length of the rebar is 12m + the maximum shrinkage is 3.5cm). At this time, the attached plate does not provide slight dimensional compensation for the cut-length baffle, and the cold shear shears the rebar.

[0065] S7. Measure the temperature of the cold shearing machine at the cold shearing position to determine whether the cold shearing temperature needs to compensate for the micro size;

[0066] S8. When the temperature is between 290-340° and there is no need to compensate for the minor size, there is no need to arrange the corresponding additional plate;

[0067] S9. Returning to the above step S7, it is determined that the temperature is between 265-290°. When a slight size compensation is required, an additional plate is arranged at the material stop end of the fixed-length baffle to shorten the extended length of the rebar during shearing.

[0068] Example 2: When producing a 9m fixed length with a specification of 22*2

[0069] The present application discloses a method for accurately controlling the length allowance of threaded steel bars, comprising the following steps:

[0070] S1. Record the climate (temperature), rebar specifications and length. Use a temperature measuring instrument to measure the corresponding temperature of each section of the cold shear under these conditions and the shrinkage of the rebar before and after cooling.

[0071] S2. Prepare a corresponding table to record the specific shrinkage values ​​of the rebar under different temperatures of the cold shearing machine, and draw a corresponding shrinkage trend chart;

[0072] S3. Analyze and determine the shrinkage constant value. Through a large amount of data record analysis, the shrinkage of the 9m fixed length 22*2 steel bar is 2.0cm at a temperature range of 330-340°C, which is the maximum shrinkage value. The shrinkage of the steel bar is 1.8cm at a temperature range of 290-330°C, and the shrinkage value begins to gradually decrease. When the temperature range reaches 265-290°C, the shrinkage value of the steel bar tends to be stable, and the shrinkage is maintained at 1.7cm. During normal rolling, the temperature range is maintained between 265-340°C.

[0073] S4. Calculate the shrinkage difference between different temperature ranges for rebars of the same specification and length;

[0074] S5. Improve the fixed-length baffle and add an additional plate to it. The thickness of the additional plate is 0.30 cm, which is the difference in shrinkage. The difference in shrinkage is 2.0 cm, the maximum shrinkage of the finished rebar, and 1.7 cm, the average shrinkage after the shrinkage stabilizes during the subsequent cold shearing process. This can compensate for the micro-size of the fixed-length baffle.

[0075] Since the delivery size of the fixed-length rebar cannot be less than the marked size of 9m, in this embodiment, after the thickness of the attached plate is determined, the thickness of the attached plate can be sheared and adjusted to reserve a corresponding margin thickness. The margin thickness can be retained to 0.10cm. At this time, the thickness of the attached plate is 0.20cm, which is used to ensure the qualified rate of the finished fixed-length rebar products, reduce the possibility of unqualified fixed-length rebar products, ensure economic efficiency, and reduce economic losses.

[0076] S6. Retrieved the corresponding data of climate temperature and rebar shrinkage, placed the cut-length baffle at the appropriate position of the roller conveyor, and adjusted the distance between the cut-length baffle and the shearing position of the cold shear to 9.020m (the cut-length length of the rebar is 12m + the maximum shrinkage is 2.0cm). At this time, the attached plate does not provide slight dimensional compensation for the cut-length baffle, and the cold shear shears the rebar.

[0077] S7. Measure the temperature of the cold shearing machine at the cold shearing position to determine whether the cold shearing temperature needs to compensate for the micro size;

[0078] S8. When the temperature is between 290-340° and there is no need to compensate for the minor size, there is no need to arrange the corresponding additional plate;

[0079] S9. Returning to the above step S7, it is determined that the temperature is between 265-290°. When a slight size compensation is required, an additional plate is arranged at the material stop end of the fixed-length baffle to shorten the extended length of the rebar during shearing.

[0080] Example 3: When producing 12m fixed length with specification of 22*2

[0081] The present application discloses a method for accurately controlling the length allowance of threaded steel bars, comprising the following steps:

[0082] S1. Record the climate (temperature), rebar specifications and length. Use a temperature measuring instrument to measure the corresponding temperature of each section of the cold shear under these conditions and the shrinkage of the rebar before and after cooling.

[0083] S2. Prepare a corresponding table to record the specific shrinkage values ​​of the rebar under different temperatures of the cold shearing machine, and draw a corresponding shrinkage trend chart;

[0084] S3. Analyze and determine the shrinkage constant value. Through a large amount of data record analysis, the shrinkage of the 12m fixed length 22*2 steel bar is 3.50cm when the temperature range is 330-340°C, which is the maximum shrinkage value. The shrinkage of the steel bar is 3.33cm when the temperature range is 290-330°C, and the shrinkage value begins to gradually decrease. When the temperature range reaches 265-290°C, the shrinkage value of the steel bar tends to be stable and the shrinkage remains at 3.27cm. During normal rolling, the temperature range is maintained between 265-340°C.

[0085] S4. Calculate the shrinkage difference between different temperature ranges for rebars of the same specification and length;

[0086] S5. Improve the fixed-length baffle and add an additional plate to it. The thickness of the additional plate is 0.23cm, which is the difference in shrinkage. The difference in shrinkage is 3.50cm, the maximum shrinkage of the finished fixed-length rebar product, and 3.27cm, the average shrinkage after the shrinkage in the subsequent cold shearing process tends to be stable. This can compensate for the micro-size of the fixed-length baffle.

[0087] Since the delivery size of the fixed-length rebar cannot be less than the marked size of 12m, in this embodiment, after the thickness of the attached plate is determined, the thickness of the attached plate can be sheared and adjusted to reserve a corresponding margin thickness. The margin thickness can be retained to 0.10cm. At this time, the thickness of the attached plate is 0.13cm, which is used to ensure the qualified rate of the finished fixed-length rebar products, reduce the possibility of unqualified fixed-length rebar products, ensure economic efficiency, and reduce economic losses.

[0088] S6. Retrieved the corresponding data of climate temperature and rebar shrinkage, placed the cut-length baffle at the appropriate position of the roller conveyor, and adjusted the distance between the cut-length baffle and the shearing position of the cold shear to 12.035m (the cut-length length of the rebar is 12m + the maximum shrinkage is 3.50cm). At this time, the auxiliary plate does not provide slight dimensional compensation for the cut-length baffle, and the cold shear shears the rebar.

[0089] S7. Measure the temperature of the cold shearing machine at the cold shearing position to determine whether the cold shearing temperature needs to compensate for the micro size;

[0090] S8. When the temperature is between 290-340° and there is no need to compensate for the minor size, there is no need to arrange the corresponding additional plate;

[0091] S9. Returning to the above step S7, it is determined that the temperature is between 265-290°. When a slight size compensation is required, an additional plate is arranged at the material stop end of the fixed-length baffle to shorten the extended length of the rebar during shearing.

[0092] As attached Figure 7 As shown, an embodiment of the present application discloses an improved structure for accurately controlling the length allowance of threaded steel bars, including a length baffle 3. In this embodiment, the length baffle 3 is arranged on a roller table 1, and a driving device for controlling the position of the length baffle 3 is installed on the cooling bed. In this embodiment, the driving device can be a hydraulic cylinder. An auxiliary plate 4 is installed on the side of the length baffle 3 close to the cold shear 2. The auxiliary plate 4 is in contact with the material blocking end of the length baffle 3, and the width of the auxiliary plate 4 is smaller than the width of the length baffle 3. The auxiliary plate 4 is used to compensate for the corresponding shrinkage of the threaded steel length.

[0093] Reference Figure 7 A slide rail structure 5 is installed between the attached plate 4 and the fixed-length baffle 3. The slide rail structure 5 includes two tracks 51 and a cylinder 52. The two tracks 51 are respectively installed on both sides of the length direction of the fixed-length baffle 3, and each track 51 is set along the height direction of the fixed-length baffle 3. The two ends of the attached plate 4 are respectively slidably connected to the tracks 51 on both sides. One end of the cylinder 53 is installed on the cooling bed. The cylinder 53 is vertically arranged in the length direction of the track 51. The output end of the cylinder 53 can be detachably installed on the attached plate 4.

[0094] The embodiment of the present application discloses an improved structure for accurately controlling the length allowance of threaded steel. The implementation principle is as follows: when measuring the temperature at the cold shearing point of the cold shearing machine 2 and judging that the temperature at the cold shearing point of the cold shearing machine 2 drops to 290°, when the micro size needs to be compensated, the cylinder 53 starts to work after receiving the temperature signal at the cold shearing point. At this time, the auxiliary plate 4 is slidably connected in the rails 51 on both sides until one end of the auxiliary plate 4 abuts against the roller 1. The auxiliary plate 4 adjusts the distance between the length baffle 3 and the cold shearing machine 2 to adjust the shrinkage amount of the threaded steel. Through the arrangement of the auxiliary plate 4, the slide rail, the pulley 52 and the cylinder 53, the structure is simple and the operation is convenient, and the length allowance of the threaded steel is accurately adjusted.

[0095] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for accurately controlling the length allowance of threaded steel, characterized in that: The steps include: S1. Record the climate temperature, rebar specifications and length, and measure the corresponding temperatures of each section of the cold shear under these conditions, as well as the shrinkage of the rebar before and after cooling. S2. Prepare a corresponding table to record the specific shrinkage values ​​of the rebar under different temperatures of the cold shearing machine, and draw a corresponding shrinkage trend chart; S3. Analyze and determine the shrinkage value. Through a large amount of data recording and analysis, the corresponding shrinkage value of rebar of the same specification and length in each temperature range; S4. Calculate the shrinkage difference between different temperature ranges for rebars of the same specification and length; S5. Improve the fixed-length baffle by designing and adding an additional plate to the fixed-length baffle to compensate for the minor size of the fixed-length baffle. The thickness of the additional plate in step S5 is the difference between the maximum shrinkage value of the threaded steel bar of the same specification and length and the average shrinkage value after the shrinkage during the subsequent cold shearing process tends to be stable. After the thickness of the additional plate is determined in step S5, the thickness of the additional plate is sheared and adjusted to reserve a corresponding margin thickness. S6. Retrieve the corresponding data of climate temperature and rebar shrinkage, arrange the fixed-length baffle at the appropriate position of the roller conveyor, and at this time, the attached plate does not provide slight size compensation for the fixed-length baffle, and the cold shear cuts the rebar; S7. Measure the temperature of the cold shear at the cold shearing machine to determine whether the cold shear temperature requires compensation for micro-size. If the temperature is between 290°C and 340°C, then compensation for micro-size is not required. If the temperature is between 265°C and 290°C, then compensation for micro-size is required. S8. If it is determined that there is no need to compensate for the micro-size, there is no need to arrange the corresponding additional plate; S9. Returning to the above step S7, when it is determined that a slight size needs to be compensated, an additional plate is arranged at the material stop end of the fixed-length baffle to shorten the extended length of the threaded steel bar during shearing.

2. The method for accurately controlling the length allowance of threaded steel bars according to claim 1, characterized in that: The temperature data recorded in step S1 are obtained by measuring the temperature using a temperature measuring instrument next to the cold shearing machine.

3. The method for accurately controlling the length allowance of threaded steel bars according to claim 1, characterized in that: In step S2, the shrinkage of threaded steel bars of the same specification and length at different climate temperatures is the same, and the effect of climate temperature on the shrinkage of threaded steel bars is close to zero.

4. The method for accurately controlling the length allowance of threaded steel bars according to claim 1, characterized in that: In step S3, it is found through a large amount of data analysis that the shrinkage of the rebar of the same specification and length is the largest during the initial cold shearing, and the shrinkage of the rebar remains at an average shrinkage value until the cold shearing temperature approaches a certain temperature range.

5. The method for accurately controlling the length allowance of threaded steel bars according to claim 1, characterized in that: In step S3, a large amount of data analysis also shows that for rebars of the same specification, under the same shearing temperature, the longer the rebar is after shearing, the greater the shrinkage.

6. The method for accurately controlling the length allowance of threaded steel bars according to claim 1, characterized in that: In step S6, the distance between the fixed-length baffle and the shearing position of the cold shear is the fixed-length length of the threaded steel bar plus the maximum shrinkage.

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