Online negative difference rapid measurement method for deformed steel bar

Abstract

The invention discloses a deformed steel bar online negative difference rapid measurement method, and relates to the field of deformed steel bar processing, based on a deformed steel bar measurement device, the deformed steel bar measurement device comprises a saw cutting mechanism, a cooling mechanism, a cover protection mechanism and a cold sawing machine, and online negative difference measurement based on the deformed steel bar measurement device comprises the following steps: S1, red strip pretreatment and cutting; s2, a segmented cooling process; s3, saw cutting with a cold saw; s4, removing water from the surface and weighing; and S5, calculating the weight per meter and judging the negative difference. Through hot-state cutting, fixed-length calculation, segmented cooling, double-end synchronous cold saw cutting and quick dehydration by compressed air, the detection time can be effectively shortened, a fixed-distance cold saw ensures that the length error after sawing is small, an electronic balance is matched to thoroughly remove water and eliminate moisture interference, the hardness of a sawing position is controlled through segmented cooling to ensure that the section is flat and vertical, and the detection accuracy is improved. The length and weight measurement precision is improved, and efficient and accurate online measurement of the deformed steel bar meter weight negative difference is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of threaded steel processing, and in particular to a method for quickly measuring the negative difference of threaded steel on-line. Background Art

[0002] Rebar, also known as hot-rolled ribbed steel bars, has longitudinal ribs and transverse ribs evenly distributed along its length. These ribs are usually spiral, herringbone, or crescent-shaped. The weight per meter (weight per meter) of rebar is subject to mandatory national standards and must meet these requirements. Therefore, after changing the rollers or the hole shape, mass production of rebar can only begin after the quality inspectors have checked for weight deviations after trial rolling.

[0003] For example, the "Online Weight-per-Meter Monitoring System and Method for Rebar" with publication number CN117054281A includes a main control module for transmitting the data signal of the diameter gauge to the main control cabinet via an optical cable; a setting module for setting the parameters of the diameter gauge; a length measurement module for real-time measurement of the length of the rebar bar; a diameter gauge module for measuring the cross-sectional area of the bar when it passes through the outlet of the finishing mill; a protection module for protecting the diameter gauge instrument; a display module for displaying the measurement data on a display screen; and an alarm module for reminding staff when problems occur in the measurement of the rebar bar.

[0004] In the existing technology, after the rebar is trial-rolled after the rolls or the hole profile is changed, offline sampling, cooling, and weighing are required to calculate the meter weight deviation. During the production process, roll wear will gradually affect the meter weight deviation, but the existing detection cannot be monitored in real time. Regular shutdown sampling and detection are required, and timely adjustments cannot be made, which will lead to batches of unqualified products. At the same time, during cutting measurement, direct water spraying for rapid cooling will increase the hardness of the sawing position, making cold saw cutting difficult. The irregular cross-section further aggravates the length measurement deviation, affecting the measurement results. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for rapid online negative difference measurement of threaded steel to solve the problems proposed in the above-mentioned background technology, such as the need to regularly shut down for sampling and testing, the inability to make timely adjustments, and the direct water spraying for rapid cooling which increases the hardness of the sawing position, making cold saw cutting difficult and affecting the measurement results.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a method for quickly measuring the negative difference of threaded steel bars online, based on a threaded steel measuring device, the threaded steel measuring device including a sawing mechanism, a cooling mechanism, a shielding mechanism, and a cold sawing machine, and performing online negative difference measurement based on the threaded steel measuring device includes the following steps: S1. Red strip pretreatment and cutting: Cut the red strip from the cooling bed according to the cutting length, and it must be straight; S2, segmented cooling process: the red strip after mechanical straightening is placed in the shielding mechanism, the sawing position of the red strip is shielded and then cooled by water spraying through the cooling mechanism, and then the shielded sawing position is exposed and water spraying is continued to cool to room temperature; S3. Cold saw cutting: After the red strip is positioned and clamped, use a cold saw to saw the two ends of the red strip; S4. Surface dehydration and weighing: Blow compressed air on the surface and end faces of the sawn steel bars, place the dehydrated steel bars steadily in the center of the balance tray, and read the weight data.

[0007] S5. Calculation of weight by meter and determination of negative difference: Calculate the actual weight by meter and the weight deviation result, and determine whether the weight deviation exceeds the standard range.

[0008] Preferably, in step S1, the red strip pre-processing and cutting comprises the following steps: S11, determining the cutting length: calculating the cutting length of the red strip according to the cutting length calculation formula; S12. Red strip cutting and straightening: Use the fixed-length cutting mechanism to hot-cut the red strip on the cooling bed according to the calculated red strip cutting length, and manually perform mechanical straightening of the red strip.

[0009] Preferably, in step S3, the cold sawing comprises the following steps: S31, positioning calibration: install the cooled red strip on the sawing mechanism and fix the position of the red strip; S32. Sawing operation: Start the cold saw machine, control the saw blade to saw both ends of the red strip at a uniform speed, remove the 50-100mm cut marks at both ends, and keep the middle measuring section.

[0010] Preferably, in step S4, when the compressed air is blown, the nozzle is inclined at an angle of 45° to the surface of the steel bar, and the blowing time is 10-15 seconds.

[0011] Preferably, the cooling mechanism includes a fixed plate, one side of each of the two fixed plates is slidably connected to a second pulley, one end of the second pulley is rotatably connected to a push frame, one side of the push frame is fixedly connected to a first water pipe, both ends of the first water pipe are fixedly connected to the second water pipe, and the inner side of the push frame is slidably connected to the first pulley.

[0012] Preferably, one end of the first pulley is rotatably connected to a push rod, one end of the push rod is fixedly connected to a rotating rod, one end of the rotating rod is fixedly connected to a drive motor, and one side of the drive motor is fixedly connected to the top side of one of the fixed plates.

[0013] Preferably, the protection mechanism includes a fixed frame, the other side of the fixed plate is fixedly connected to the top side of the fixed frame, one side of the fixed frame is fixedly connected to a cooling groove, a movable frame is provided on the inner side of the cooling groove, one side of the movable frame is fixedly connected to a second protective cover, one side of the second protective cover is rotatably connected to the first protective cover, both sides of the first protective cover are rotatably connected to a second electric push rod, and the other end of the second electric push rod is rotatably connected to the outside of the second protective cover.

[0014] Preferably, one side of the cooling trough is fixedly connected to a water outlet pipe, the other side of the movable frame is fixedly connected to a first electric push rod, and the other end of the first electric push rod is fixedly connected to one side of the fixed frame.

[0015] Preferably, the outer side of the movable frame is rotatably connected to a third pulley, the outer side of the third pulley is slidably connected to a guide rod, and one end of the guide rod is fixedly connected to one side of the fixed frame.

[0016] Preferably, the sawing mechanism includes a processing bed, the top side of the processing bed is fixedly connected to the cold saw machine, the top side of the processing bed is fixedly connected to a positioning plate, two clamping blocks are provided on one side of the positioning plate, one end of the clamping block is fixedly connected to a movable plate, one side of the movable plate is rotatably connected to a threaded rod, the external thread of the threaded rod is connected to a mounting plate, one side of the mounting plate is fixedly connected to one side of the processing bed, and the outer side of the mounting plate is slidably connected to the movable plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses hot cutting and fixed-length calculation, segmented cooling, double-end synchronous cold sawing, and compressed air rapid water removal to effectively reduce inspection time, support rapid initial inspection after roller replacement, and real-time monitoring of the production process, thus avoiding production line waiting time. The fixed-pitch cold saw machine ensures small length error after sawing, and the electronic balance cooperates with thorough water removal to eliminate moisture interference. The segmented cooling controls the hardness of the sawing position to ensure a flat and vertical cross-section, thereby improving the length and weight measurement accuracy and realizing efficient and accurate online measurement of the weight difference per meter of rebar. 2. In the present invention, an external water pump is connected to one end of the second water pipe to feed cooling water into the interior of the first water pipe through the second water pipe, and water is evenly sprayed into the cooling tank. First, the first protective cover is placed at the steel bar sawing position to isolate the cooling water from directly splashing onto the sawing position, thereby preventing the surface hardening of the area due to rapid cooling. After the overall temperature of the red bar drops from high temperature to about 100°C, the second electric push rod is operated to rotate the first protective cover to open the first protective cover, and continue to spray water to cool to room temperature, and staged cooling is used to control the hardness of the sawing position. 3. In the present invention, the driving motor drives the rotating rod to rotate, and the push rod performs circular motion, driving the first pulley to move. At the same time, the first pulley slides on the inner side of the push frame, and the second pulley slides inside the fixed plate, so that the push frame performs linear motion, and the positions of the second water pipe and the third water pipe are moved, so that the cooling position can be adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of a method for quickly measuring the negative difference of threaded steel on-line according to the present invention; Figure 2 This is a schematic diagram of the first three-dimensional structure of a threaded steel measuring device in a threaded steel online negative difference rapid measurement method according to the present invention; Figure 3 This is a second three-dimensional structural diagram of a threaded steel measuring device in a threaded steel online negative difference rapid measurement method according to the present invention; Figure 4 This is a schematic diagram of the connection structure of the cooling mechanism and the shielding mechanism of the threaded steel measuring device in the threaded steel online negative difference rapid measurement method of the present invention; Figure 5 This is a schematic diagram of the connection structure of the cooling mechanism of a threaded steel measuring device in a threaded steel online negative difference rapid measurement method of the present invention; Figure 6 This is a schematic diagram of the disassembled structure of the cooling mechanism of a threaded steel measuring device in a threaded steel online negative difference rapid measurement method of the present invention; Figure 7 This is a schematic diagram of the connection structure of the cover mechanism of the threaded steel measuring device in the threaded steel online negative difference rapid measurement method of the present invention; Figure 8 This is a schematic diagram of the disassembled structure of a cover mechanism of a threaded steel measuring device in a threaded steel online negative difference rapid measurement method of the present invention; Figure 9 This is a schematic diagram of the connection structure of the sawing mechanism and cold saw machine of the threaded steel measuring device in the threaded steel online negative difference rapid measurement method of the present invention.

[0019] In the figure: 1. Sawing mechanism; 11. Processing bed; 12. Moving plate; 13. Clamping block; 14. Positioning plate; 15. Threaded rod; 16. Mounting plate; 2. Cooling mechanism; 21. Fixed plate; 22. First water pipe; 23. Second water pipe; 24. Push frame; 25. Driving motor; 26. Rotating rod; 27. Push rod; 28. First pulley; 29. Second pulley; 3. Cover mechanism; 31. Fixed frame; 32. Water outlet pipe; 33. Cooling trough; 34. Moving frame; 35. Guide rod; 36. First electric push rod; 37. Third pulley; 38. First protective cover; 39. Second electric push rod; 310. Second protective cover; 4. Cold saw machine. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 Shown: A method for rapid online negative difference measurement of rebar, which solves the problems of time-consuming offline detection, inability to monitor in real time, and cooling cutting.

[0022] 1. Technical solution: 1. Core measurement device Specifically include: Sawing mechanism 1: including processing bed 11, clamping block 13, positioning plate 14, etc., used for red strip positioning and sawing at both ends.

[0023] Cooling mechanism 2: The first water pipe 22 and the second water pipe 23 are driven to move by the driving motor 25, the first pulley 28 and the second pulley 29 to achieve uniform water spray cooling.

[0024] The shielding mechanism 3 includes a first shield 38, a second shield 310, and a second electric push rod 39, which shield and protect the sawing position to avoid rapid cooling and hardening.

[0025] Cold saw machine 4: Saw the two ends of the red strip at a uniform speed to remove irregular ends.

[0026] 2. Measurement steps Red stripe pretreatment and cutting (S1) Determine cutting length (S11): Formula: Cutting length = (measured length + cutting head and tail length) × thermal expansion coefficient The measuring length is 550mm, with 50-100mm left at both ends of the cutting head and tail (to adapt to the cold saw machine 4 to remove irregular ends), and the thermal expansion coefficient is 1.01.

[0027] Red strip cutting and straightening (S12): Use a fixed-length cutting mechanism to cut the red strip of the cooling bed and manually straighten it to avoid affecting the positioning accuracy of the subsequent sawing mechanism 1.

[0028] Segmented cooling process (S2) (based on shielding mechanism 3 and cooling mechanism 2) Step 1: Block the sawing position for cooling The red strip is placed on the second protective cover 310 , and the first protective cover 38 is driven by the second electric push rod 39 to cover the sawing position. The first electric push rod 36 drives the movable frame 34 to descend along the guide rod 35 into the cooling tank 33 .

[0029] The driving motor 25 drives the rotating rod 26, the pushing rod 27 and the first pulley 28, so that the pushing frame 24 slides on the fixed plate 21 through the second pulley 29, and the first water pipe 22 and the second water pipe 23 are moved to the top of the red strip to spray water, cooling the non-sawing area to about 100°C. The sawing position is isolated by the first protective cover 38 to avoid rapid cooling.

[0030] Step 2: Expose the sawing position and continue cooling The second electric push rod 39 opens the first protective cover 38, and the cooling mechanism 2 continues to spray water until the entire red strip reaches room temperature, ensuring that the sawing position is slowly cooled to prevent hardening.

[0031] Cold saw cutting (S3) (based on sawing mechanism 1 and cold saw machine 4) Positioning calibration (S31): The cooled red strip rests against the positioning plate 14, and the threaded rod 15 is rotated to drive the movable plate 12 and the clamping block 13 to clamp the red strip, ensuring that the axis is perpendicular to the feeding direction of the saw blade of the cold saw machine 4.

[0032] Sawing operation (S32): Cold saw machine 4 synchronously saws the two ends of the red bar, removes the 50-100mm cut mark section, retains the middle measuring section, and the cross section must be perpendicular to the longitudinal direction of the steel bar.

[0033] Surface water removal and weighing (S4) Blow compressed air at a 45° angle on the surface of the steel bar for 10-15 seconds to remove water droplets (to avoid affecting the weighing accuracy of the balance), and place it in the center of the balance tray to read the reading.

[0034] Meter weight calculation and negative difference judgment (S5) Actual weight per meter: Actual weight per meter (g / mm) = Actual weight (g) ÷ Length after sawing (mm) (The length after sawing is measured by the distance between the two end surfaces with a precision of 1mm steel ruler, and the average value of three times is taken).

[0035] Weight deviation: According to GB / T1499.2 standard, query the theoretical weight corresponding to the nominal diameter through Table 1 (Rebar Theoretical Weight Table), calculate the deviation and determine whether to trigger the rolling mill adjustment signal (such as roll gap, rolling speed adjustment).

[0036] 2. Technical Principle: 1. Principle of segmented cooling to prevent hardening (core function of shielding mechanism 3) Problem: Traditional direct water spray cooling of the sawing area causes the hardness of this area to increase, making it difficult for the cold saw machine to cut and the cross section irregular, affecting the length measurement.

[0037] Solution: Phase 1: Use the first protective cover 38 and the second protective cover 310 to block the sawing position, and only use the first water pipe 22 and the second water pipe 23 of the cooling mechanism 2 to cool the non-sawing area. The red strip is cooled to about 100°C as a whole, and the sawing position does not directly contact the cooling water to avoid rapid cooling.

[0038] The second stage: the protective cover is opened by the second electric push rod 39, and the sawing position and other areas are cooled to room temperature synchronously to ensure uniform cooling, prevent local hardening, and ensure that the cutting section of the cold saw machine 4 is flat.

[0039] 2. Online real-time measurement principle (replacing offline detection process) Traditional defects: Offline sampling requires cooling and weighing, which takes a long time. It is impossible to monitor the meter weight deviation caused by roller wear in real time, which easily leads to batches of defective products.

[0040] Online advantages: After being hot-cut on the cooling bed, the red strip directly enters the shielding mechanism 3 for cooling, the sawing mechanism 1 for sawing, and the scale for weighing. The deviation is calculated in real time through a formula, and the first electric push rod 36, the drive motor 25 and other devices are used for automatic control, and the feedback is immediately fed back to the rolling mill for adjustment, realizing dynamic quality monitoring.

[0041] Example 2: Reference Figure 1 As shown: A method for quickly measuring the negative difference of threaded steel on-line is provided. The method is based on a threaded steel measuring device. The threaded steel measuring device includes a sawing mechanism 1, a cooling mechanism 2, a shielding mechanism 3, and a cold saw machine 4. The online negative difference measurement based on the threaded steel measuring device includes the following steps: S1. Red strip pretreatment and cutting: Cut the red strip from the cooling bed according to the cutting length, and it must be straight; In step S1, the red stripe pre-processing and cutting includes the following steps: S11, determining the cutting length: calculating the cutting length of the red strip according to the cutting length calculation formula; The cutting length calculation formula is: cutting length = (measured length + cutting head and tail length) × thermal expansion coefficient, where the measured length is 550mm. The cutting head and tail lengths are based on the characteristics of the cold saw machine and process requirements. 50-100mm is reserved at both ends to remove irregular ends during sawing. The thermal expansion coefficient is 1.01, which is used to correct the length error of the red bar in the hot state. S12. Red strip cutting and straightening: Use a fixed-length cutting mechanism to hot-cut the red strip on the cooling bed according to the calculated red strip cutting length, and manually straighten the red strip mechanically to ensure that the red strip straightness error is ≤1mm / m to avoid bending that affects the subsequent sawing accuracy.

[0042] S2, segmented cooling process: the red strip after mechanical straightening is placed in the shielding mechanism 3, the red strip sawing position is shielded and then cooled by water spraying through the cooling mechanism 2, and then the shielded sawing position is exposed and continued to be cooled by water spraying to room temperature; S3, cold saw cutting: After the red strip is positioned and clamped, use the cold saw machine 4 to saw the two ends of the red strip; In step S3, cold saw cutting includes the following steps: S31, positioning and calibration: install the cooled red bar on the sawing mechanism 1, fix the position of the red bar, and ensure that the axis of the steel bar is perpendicular to the feeding direction of the saw blade; S32. Sawing operation: Start the cold saw machine 4, control the saw blade to saw both ends of the red bar at a uniform speed, ensure that the cross section is flat and perpendicular to the longitudinal direction of the steel bar; after sawing, remove the 50-100mm cut marks at both ends and retain the middle measuring section.

[0043] S4. Surface dehydration and weighing: Blow compressed air on the surface and end faces of the sawn steel bars, place the dehydrated steel bars steadily in the center of the balance tray, and read the weight data.

[0044] When using compressed air to blow, the nozzle is tilted at a 45° angle to the steel bar surface and the blowing time is 10-15 seconds to ensure that no visible water droplets remain to avoid moisture affecting the weighing accuracy.

[0045] S5. Calculation of weight per meter and determination of negative difference: Calculate the actual weight per meter and the weight deviation according to the formula, and determine whether the weight deviation exceeds the standard range; The formula for calculating the actual weight per meter is: actual weight per meter (g / mm) = actual weight (g) ÷ length after sawing (mm), where the length after sawing is the actual length of the middle section. Use a steel ruler with an accuracy of 1mm to measure the distance between the two end surfaces and take the average of three measurements; The weight deviation calculation formula is: Weight deviation (%) = [(actual weight per meter - theoretical weight) ÷ theoretical weight] × 100%, where the theoretical weight value is based on the nominal diameter of the steel bar and the corresponding value can be found in Table 1; The judgment standard is implemented in accordance with GB / T1499.2 standard. The weight deviation must be within the allowable range. If it exceeds the range, the rolling mill adjustment signal will be triggered to adjust the roll gap or rolling speed, and re-sample and measure until it is qualified to avoid batch unqualified products.

[0046] Table 1 Theoretical weight of steel bars Specifications (nominal diameter) mm Theoretical weight g / mm 6 0.222 8 0.395 10 0.617 12 0.888 14 1.21 16 1.58 18 2.00 20 2.47 22 2.98 25 3.85 28 4.83 32 6.31 36 7.99 40 9.87 50 15.42 Example 3: Reference Figure 2-Figure 9As shown: the cooling mechanism 2 includes a fixed plate 21, one side of the two fixed plates 21 is slidably connected to a second pulley 29, one end of the second pulley 29 is rotatably connected to a push frame 24, one side of the push frame 24 is fixedly connected to a first water pipe 22, both ends of the first water pipe 22 are fixedly connected to the second water pipe 23, the inner side of the push frame 24 is slidably connected to a first pulley 28; one end of the first pulley 28 is rotatably connected to a push rod 27, one end of the push rod 27 is fixedly connected to a rotating rod 26, and one end of the rotating rod 26 is fixed The cam 35 is fixedly connected to the top of the cam 35 and the cam 35 is fixedly connected to the top of the cam 35. The cam 35 is fixedly connected to the top of the cam 35 and the cam 35 is fixedly connected to the top of the cam 35. Side; The sawing mechanism 1 includes a processing bed 11, the top side of the processing bed 11 is fixedly connected to the cold saw machine 4, the top side of the processing bed 11 is fixedly connected to a positioning plate 14, one side of the positioning plate 14 is provided with two clamping blocks 13, one end of the clamping block 13 is fixedly connected to a movable plate 12, one side of the movable plate 12 is rotatably connected to a threaded rod 15, the external thread of the threaded rod 15 is connected to a mounting plate 16, one side of the mounting plate 16 is fixedly connected to one side of the processing bed 11, and the outer side of the mounting plate 16 is slidably connected to the movable plate 12.

[0047] After the red bar is cut to a fixed length, it is placed on the second protective cover 310, and the second electric push rod 39 is operated. The two ends of the second electric push rod 39 are respectively connected to the first protective cover 38 and the second protective cover 310. When the second electric push rod 39 rotates when working, it can drive the first protective cover 38 to rotate to cover the second protective cover 310, covering the sawing position of the steel bar. The first electric push rod 36 drives the movable frame 34 to move, and the third pulley 37 slides on the outside of the guide rod 35, fixing the movable frame 34 to make a linear motion, driving the placed The second protective cover 310 with steel bars moves downward to the inside of the cooling trough 33, the driving motor 25 drives the rotating rod 26 to rotate, the pushing rod 27 makes a circular motion, drives the first pulley 28 to move, and notifies the first pulley 28 to slide on the inside of the pushing frame 24, which can drive the second pulleys 29 at both ends of the pushing frame 24 to slide inside the fixed plate 21, so that the pushing frame 24 makes a linear motion, and moves the pushing frame 24 to the top of the steel bar. One end of the second water pipe 23 is connected to an external water pump to send cooling water through the second water pipe 23 into the first water pipe 22. Inside, water is sprayed evenly into the groove to control the cooling speed. At this time, the first protective cover 38 is covered at the steel bar sawing position, isolating the cooling water from directly splashing to the sawing position, avoiding the surface hardening of the area due to rapid cooling, ensuring smooth subsequent cold saw cutting, and making the overall temperature of the red bar drop from high temperature to about 100°C. The second electric push rod 39 works to rotate the first protective cover 38 to open, and continues to spray water to cool to room temperature. The drive motor 25 works to drive the rotating rod 26 to rotate, and the first water pipe 22 is moved to one side. The first electric push rod 36 works to drive the steel bar to rise Start by transferring the steel bar to the processing bed 11, with one side of the steel bar abutting against one side of the positioning plate 14, and rotating the threaded rod 15. The threaded rod 15 moves on the threaded mounting plate 16, driving the movable plate 12 to move. At the same time, the movable plate 12 slides on the outside of the mounting plate 16, and the fixed movable plate 12 moves in a straight line, driving the clamping block 13 to move, and cooperating with the positioning plate 14 to position the red strip, and starting the cold saw machine 4. The two ends of the red strip are sawed at the same time by two cold saw machines 4 with a fixed spacing, removing the cut sections at both ends and retaining the middle measuring section.

[0048] The present invention first cuts the red strip from the cooling bed according to the cutting length. After the fixed length cutting, it is placed on the second protective cover 310, and the second electric push rod 39 works. The two ends of the second electric push rod 39 are rotatably connected to the first protective cover 38 and the second protective cover 310 respectively. When the second electric push rod 39 works, it can drive the first protective cover 38 to rotate until it covers the second protective cover 310, covering the sawing position of the steel bar. The first electric push rod 36 works to drive the movable frame 34 to move, and the third pulley 37 slides on the outside of the guide rod 35. The fixed movable frame 34 performs linear motion, driving the second protective cover 310 with the steel bar placed thereon to move downward to the inside of the cooling tank 33. The drive motor 25 works to drive the rotating rod 26 to rotate, and the push rod 27 performs circular motion, driving the first pulley 28 to move, notifying the first pulley 28 to slide on the inner side of the push frame 24, and can drive the second pulleys 29 at both ends of the push frame 24 to slide inside the fixed plate 21, so that the push frame 24 performs linear motion and moves the push frame 24 above the steel bar.

[0049] One end of the second water pipe 23 is connected to an external water pump, which sends cooling water into the interior of the first water pipe 22 through the second water pipe 23, and sprays water evenly into the cooling tank 33 to control the cooling speed. At this time, the first protective cover 38 covers the steel bar sawing position, isolating the cooling water from directly splashing to the sawing position, avoiding the surface hardening of this area due to rapid cooling, ensuring smooth subsequent cold saw cutting, and after the overall temperature of the red strip drops from high temperature to about 100°C, the second electric push rod 39 works to rotate the first protective cover 38 to open, and continue to spray water to cool to room temperature. The drive motor 25 works to drive the rotating rod 26 to rotate, moving the first water pipe 22 to a On the other hand, the first electric push rod 36 works to drive the steel bar to rise and transfer the steel bar to the processing bed 11. One side of the steel bar abuts against one side of the positioning plate 14, and the threaded rod 15 is rotated. The threaded rod 15 moves on the threaded mounting plate 16, driving the movable plate 12 to move. At the same time, the movable plate 12 slides on the outside of the mounting plate 16, and the fixed movable plate 12 performs a linear motion, driving the clamping block 13 to move, and cooperates with the positioning plate 14 to position the red strip, and starts the cold saw machine 4. The two cold saw machines 4 with a fixed spacing are used to saw the two ends of the red strip at the same time, removing the cut segments at both ends and retaining the middle measuring segment.

[0050] Compressed air is used to blow the surface and end faces of the sawn steel bars to ensure that no visible water droplets remain to prevent moisture from affecting the weighing accuracy. The steel bars after dehydration are placed stably in the center of the balance tray, the weight data is read, the actual weight per meter and the weight deviation results are calculated, and it is determined whether the weight deviation exceeds the standard range.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for quickly measuring the negative difference of threaded steel online, characterized in that: The threaded steel online negative difference measurement method is based on a threaded steel measuring device, the threaded steel measuring device comprising a sawing mechanism (1), a cooling mechanism (2), a shielding mechanism (3) and a cold sawing machine (4). The online negative difference measurement based on the threaded steel measuring device comprises the following steps: S1. Red strip pretreatment and cutting: Cut the red strip from the cooling bed according to the cutting length, and it must be straight; S2, segmented cooling process: the red strip after mechanical straightening is placed in the shielding mechanism (3), the sawing position of the red strip is shielded and then water-sprayed and cooled through the cooling mechanism (2), and then the shielded sawing position is exposed and water-sprayed and cooled to room temperature; S3, cold saw cutting: After the red strip is positioned and clamped, the cold saw machine (4) is used to saw the two ends of the red strip; S4. Surface dehydration and weighing: Blow compressed air on the surface and end faces of the sawn steel bar, place the dehydrated steel bar steadily in the center of the balance tray, and read the weight data; S5. Calculation of weight by meter and determination of negative difference: Calculate the actual weight by meter and the weight deviation result, and determine whether the weight deviation exceeds the standard range.

2. The method for rapid online negative difference measurement of threaded steel according to claim 1, characterized in that: In step S1, the red stripe pre-processing and cutting includes the following steps: S11, determining the cutting length: calculating the cutting length of the red strip according to the cutting length calculation formula; S12. Red strip cutting and straightening: Use the fixed-length cutting mechanism to hot-cut the red strip on the cooling bed according to the calculated red strip cutting length, and manually perform mechanical straightening of the red strip.

3. The method for rapid online negative difference measurement of threaded steel according to claim 1, characterized in that: In step S3, cold saw cutting includes the following steps: S31, positioning calibration: installing the cooled red strip on the sawing mechanism (1) and fixing the position of the red strip; S32, sawing operation: start the cold saw machine (4), control the saw blade to saw at a uniform speed at both ends of the red strip at the same time, remove the 50-100 mm cut marks at both ends, and keep the middle measuring section.

4. The method for rapid online negative difference measurement of threaded steel according to claim 1, characterized in that: In step S4, when the compressed air is blown, the nozzle is tilted at an angle of 45° to the surface of the steel bar, and the blowing time is 10-15 seconds.

5. The method for rapid online negative difference measurement of threaded steel according to claim 1, characterized in that: The cooling mechanism (2) includes a fixed plate (21), one side of each of the two fixed plates (21) is slidably connected to a second pulley (29), one end of the second pulley (29) is rotatably connected to a push frame (24), one side of the push frame (24) is fixedly connected to a first water pipe (22), both ends of the first water pipe (22) are fixedly connected to a second water pipe (23), and the inner side of the push frame (24) is slidably connected to the first pulley (28).

6. The method for rapid online negative difference measurement of threaded steel according to claim 5, characterized in that: One end of the first pulley (28) is rotatably connected to a push rod (27), one end of the push rod (27) is fixedly connected to a rotating rod (26), one end of the rotating rod (26) is fixedly connected to a drive motor (25), and one side of the drive motor (25) is fixedly connected to the top side of one of the fixed plates (21).

7. The method for rapid online negative difference measurement of threaded steel according to claim 1, characterized in that: The shielding mechanism (3) includes a fixed frame (31), the other side of the fixed plate (21) is fixedly connected to the top side of the fixed frame (31), one side of the fixed frame (31) is fixedly connected to a cooling groove (33), the inner side of the cooling groove (33) is provided with a movable frame (34), one side of the movable frame (34) is fixedly connected to a second protective cover (310), one side of the second protective cover (310) is rotatably connected to the first protective cover (38), both sides of the first protective cover (38) are rotatably connected to a second electric push rod (39), and the other end of the second electric push rod (39) is rotatably connected to the outer side of the second protective cover (310).

8. The method for rapid online negative difference measurement of threaded steel according to claim 7, characterized in that: One side of the cooling trough (33) is fixedly connected to a water outlet pipe (32), the other side of the movable frame (34) is fixedly connected to a first electric push rod (36), and the other end of the first electric push rod (36) is fixedly connected to one side of the fixed frame (31).

9. The method for rapid online negative difference measurement of threaded steel according to claim 7, characterized in that: The outer side of the movable frame (34) is rotatably connected to a third pulley (37), and the outer side of the third pulley (37) is slidably connected to a guide rod (35), and one end of the guide rod (35) is fixedly connected to one side of the fixed frame (31).

10. The method for rapid online negative difference measurement of threaded steel according to claim 1, characterized in that: The sawing mechanism (1) includes a processing bed (11), the top side of the processing bed (11) is fixedly connected to the cold saw machine (4), the top side of the processing bed (11) is fixedly connected to a positioning plate (14), one side of the positioning plate (14) is provided with two clamping blocks (13), one end of the clamping block (13) is fixedly connected to a movable plate (12), one side of the movable plate (12) is rotatably connected to a threaded rod (15), the outer surface of the threaded rod (15) is threadedly connected to a mounting plate (16), one side of the mounting plate (16) is fixedly connected to one side of the processing bed (11), and the outer side of the mounting plate (16) is slidably connected to the movable plate (12).

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