A method for phase adjustment of a double-curved shaft
By using laser trackers and mechanical brakes in crank shears to precisely adjust the phase of the dual crankshafts, the difficulties and precision issues in the crankshaft replacement process are solved, improving replacement efficiency and shearing accuracy while reducing material waste.
Patent Information
- Application Number
- CN202411313639.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2044-09-20
AI Technical Summary
In crank-type flying shear equipment, the crankshaft replacement process is characterized by high difficulty, low efficiency, and low phase accuracy. In particular, the determination of the extreme positions of the upper and lower crankshafts by manual visual inspection is prone to errors, which affect the phase accuracy of the flying shear.
Using equipment such as laser trackers and mechanical brakes, the phases of the first and second crankshafts are precisely adjusted so that the included angle of their bent sections is 180°. The laser tracker is used to ensure that the line connecting the positioning holes is perpendicular to the horizontal line, thus ensuring phase consistency. The coupling is installed before replacement, eliminating the need for on-site disassembly and assembly.
It achieves rapid and accurate dual-crankshaft phase adjustment, improves the cutting accuracy and replacement efficiency of the crank flying shear, reduces the cutting damage of intermediate blanks, and reduces material loss.
Smart Images
Figure CN119187691B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of flying shear equipment maintenance in hot rolling mill production lines, specifically relating to a phase adjustment method for a double crankshaft. Background Technology
[0002] Flying shears are crucial equipment in hot rolling production lines. During the reciprocating rolling process of hot-rolled strip in the roughing mill, the head and tail of the intermediate billet experience abnormal elongation due to the width reduction, resulting in irregular shapes that significantly impact the threading and rolling stability of the finishing mill. The primary function of the flying shear is to cut the head and tail of the intermediate billet entering the finishing mill, ensuring the head and tail shape of the finished product and the stability of the threading and rolling process.
[0003] Crank flying shears are widely used in wide and thin hot rolling production lines. They utilize a synchronized reducer with two output shafts to drive the upper and lower crankshafts simultaneously. The reducer is equipped with a position detection encoder to detect the actual phase angle of the crankshafts. The upper and lower crankshafts are respectively connected to the upper and lower cutting heads, and the shearing of the strip is achieved by engaging the upper and lower cutting heads. Therefore, the consistency of the rotation angles and the positional accuracy of the upper and lower crankshafts are crucial to the shearing accuracy of the flying shear. Ensuring phase consistency and positional accuracy of the upper and lower crankshafts during crankshaft changes is a challenging task.
[0004] Currently, during crankshaft replacement, the extreme positions of the upper and lower crankshafts are determined visually. After the positions are determined, phase marks are pre-printed on the coupling connecting the crankshaft and the reducer output shaft. After the crankshaft replacement is completed, the marked coupling needs to be removed and installed on the new crankshaft. The pre-printed phase marks are used to determine the phase before and after the crankshaft replacement. Because the coupling is difficult to remove and install on site, the construction time is long, resulting in a decrease in crankshaft replacement efficiency.
[0005] Meanwhile, the method of determining the extreme positions of the upper and lower crankshafts by visual inspection is subject to certain human error, which affects the accuracy of the fly shear phase. Therefore, inventing a replacement method that can reduce the difficulty of crankshaft replacement and improve the accuracy of the fly shear phase is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0006] To address the aforementioned technical problems, this application provides a phase adjustment method for a dual crankshaft, thereby resolving the issues of high difficulty, low efficiency, and low phase accuracy in replacing the upper and lower crankshafts in existing crank shears.
[0007] The technical solution adopted to achieve the purpose of this application is as follows:
[0008] A phase adjustment method for a dual crankshaft, the method being used for phase adjustment during a dual crankshaft replacement process in a crank shear, wherein the replaced dual crankshaft includes a first crankshaft and a second crankshaft; the method includes the following steps:
[0009] Install the first crankshaft and the second crankshaft;
[0010] Adjust the phase of the first crankshaft so that the bent portion of the first crankshaft rotates to a side away from the second crankshaft;
[0011] Adjust the phase of the second crankshaft so that the bent portion of the second crankshaft rotates to a side away from the first crankshaft. Use a measuring device to ensure that the angle between the direction in which the bent portion of the first crankshaft deviates from the axis of the first crankshaft and the direction in which the bent portion of the second crankshaft deviates from the axis of the second crankshaft is 180°.
[0012] The two output shafts of the flying shear reducer are connected to the first crankshaft and the second crankshaft, respectively.
[0013] To better realize this application, the above method is further optimized by adjusting the phase of the first crankshaft, which includes the following steps:
[0014] Rotate the first crankshaft about its axis so that the line connecting the two first positioning holes on the first crankshaft is perpendicular to the horizontal line.
[0015] To better realize this application, the above method is further optimized by determining the angle between the line connecting the two first positioning holes and the horizontal line using a laser tracker.
[0016] To better realize this application, the above method is further optimized by adjusting the phase of the second crankshaft, which includes the following steps:
[0017] Rotate the second crankshaft about its axis so that the line connecting the two second positioning holes on the second crankshaft is perpendicular to the horizontal line.
[0018] To better realize this application, the above method is further optimized by determining the angle between the line connecting the two second positioning holes and the horizontal line using a laser tracker.
[0019] To better realize this application, the above method is further optimized by connecting the two output shafts of the flying shear reducer to the first crankshaft and the second crankshaft respectively, and then using a laser tracker to re-measure the phase of the first crankshaft and the second crankshaft.
[0020] The retesting steps include: determining that the line connecting the two first positioning holes on the first crankshaft is perpendicular to the horizontal line, and determining that the line connecting the two second positioning holes on the second crankshaft is perpendicular to the horizontal line.
[0021] To better realize this application, the above method is further optimized, and the double crankshaft before replacement includes crankshaft A and crankshaft B;
[0022] Before installing the first crankshaft and the second crankshaft, adjust the angle between the direction of the bent portion of crankshaft A away from the axis of crankshaft A and the direction of the bent portion of crankshaft B away from the axis of crankshaft B to 180°, and record the angle value displayed on the encoder on the flying shear reducer as the initial angle value;
[0023] Lock the output shaft of the flying shear reducer;
[0024] Disassemble crankshaft A and crankshaft B.
[0025] To better realize this application, the above method is further optimized by connecting the two output shafts of the flying shear reducer to the first crankshaft and the second crankshaft respectively, and recording the angle value displayed on the encoder on the flying shear reducer as the reference angle value.
[0026] The reference angle value is compared with the initial angle value. If the initial angle value is different from the reference angle value, a laser tracker is used to re-measure the phase of the first crankshaft and the second crankshaft. When it is determined that the angle between the direction in which the bent part of the first crankshaft deviates from the axis of the first crankshaft and the direction in which the bent part of the second crankshaft deviates from the axis of the second crankshaft is 180°, the encoder is adjusted so that the angle value displayed by the encoder is equal to the initial angle value.
[0027] To better realize this application, the above method is further optimized by locking the output shaft of the flying shear reducer through the clamping device.
[0028] To better realize this application, the above method is further optimized, and the clamping device includes a mechanical brake and a pad.
[0029] As can be seen from the above technical solution, the phase adjustment method of the double crankshaft provided in this application can quickly and accurately complete the phase adjustment of the double crankshaft in the crank flying shear, ensuring the phase consistency and position accuracy of the first crankshaft and the second crankshaft, and the installation of the coupling can be completed before the first crankshaft and the second crankshaft arrive at the site, saving the step of disassembling and assembling the coupling on site, thereby improving the replacement efficiency of the double crankshaft.
[0030] In addition, the positional accuracy and phase angle consistency of the first and second crankshafts play an important role in the shearing accuracy of the crank flying shear. They can effectively improve the shearing accuracy of the crank flying shear and reduce the cutting loss of intermediate billets in the hot rolling production line, thereby reducing material loss. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the crank-type flying shear described in the embodiments of this application;
[0032] Figure 2 This is a schematic diagram of the end face of the first crankshaft described in an embodiment of this application;
[0033] Figure 3 This is a schematic diagram of the end face of the second crankshaft described in an embodiment of this application.
[0034] Explanation of reference numerals in the attached figures:
[0035] 1-Flying shear reducer; 2-First crankshaft; 21-First positioning hole; 3-Second crankshaft; 31-Second positioning hole; 4-Coupling; 5-Code disc. Detailed Implementation
[0036] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0037] In this embodiment, the phase adjustment method for the dual crankshaft is mainly used for phase adjustment during the replacement process of the dual crankshaft in a crank flying shear. To better illustrate the entire replacement process, the dual crankshafts before replacement are crankshaft A and crankshaft B, i.e., crankshaft A and crankshaft B are worn crankshafts. The dual crankshafts after replacement are first crankshaft 2 and second crankshaft 3, i.e., first crankshaft 2 and second crankshaft 3 are new crankshafts. In other words, the phase adjustment method for the dual crankshaft provided in this application is a method of adjusting the phase of first crankshaft 2 and second crankshaft 3 after replacing crankshaft A and crankshaft B with first crankshaft 2 and second crankshaft 3.
[0038] The phase adjustment method for this hyperboloid includes the following steps:
[0039] Adjust the angle between the direction of the bent part of crankshaft A away from the axis of crankshaft A and the direction of the bent part of crankshaft B away from the axis of crankshaft B to 180°, that is, make the opening of the upper and lower cutter heads open to the maximum, and record the angle value displayed on the encoder 5 in the flying shear reducer 1 at this time, and record this angle value as the initial angle value.
[0040] At the same time, the output shaft of the flying shear reducer 1 is fixed;
[0041] Because the internal structure of the flying shear reducer 1 is a mechanical synchronization structure, see [link / reference] Figure 1When fixing the flying shear reducer 1, only one of the output shafts of the flying shear reducer 1 needs to be fixed; in this embodiment, a mechanical brake is used to fix the lower output shaft of the flying shear reducer 1; wherein, the lower output shaft of the flying shear reducer 1 refers to the output shaft of the flying shear reducer 1 located near the ground;
[0042] After the output shaft of the flying shear reducer 1 is fixed, the coupling 4 connecting the flying shear reducer 1 to crankshaft A and crankshaft B can be removed.
[0043] During the process of disassembling coupling 4, only the end of coupling 4 connected to the output shaft of flying shear reducer 1 can be disassembled, because when disassembling crankshaft A and crankshaft B, coupling 4 can be replaced together with crankshaft A and crankshaft B.
[0044] After removing coupling 4, the workers can take crankshaft A and crankshaft B out of the crankcase and install the prepared first crankshaft 2 and second crankshaft 3 into the crankcase.
[0045] Of course, the prepared coupling 4 can be installed at the ends of the first crankshaft 2 and the second crankshaft 3 before the first crankshaft 2 and the second crankshaft 3 are installed. Since it is not necessary to position the phase of the first crankshaft 2 and the second crankshaft 3 through the coupling 4, the installation of the coupling 4 can be completed before the first crankshaft 2 and the second crankshaft 3 enter the factory, so as to save the step of disassembling / installing the coupling 4 during the replacement process, thereby improving the replacement efficiency of the dual crankshaft.
[0046] After the installation of the first crankshaft 2 and the second crankshaft 3 is completed, the workers can adjust the positions of the first crankshaft 2 and the second crankshaft 3;
[0047] Specifically, the first crankshaft 2 is rotated so that the bent portion of the first crankshaft 2 is rotated to the side away from the second crankshaft 3; in this embodiment, the first crankshaft 2 is located at the mounting position below the crankcase, and the second crankshaft 3 is located at the position above the crankcase, so that the axis of the first crankshaft 2 and the axis of the second crankshaft 3 are in the same vertical plane;
[0048] When adjusting the position of the first crankshaft 2, the bent part of the first crankshaft 2 can be rotated to be directly below the first crankshaft 2. Of course, there will be some human error in visually judging the position of the first crankshaft 2. Here, a laser tracker can be used to determine the position accuracy of the first crankshaft 2.
[0049] After adjusting the position of the first crankshaft 2, rotate the second crankshaft 3 to rotate the bent part of the second crankshaft 3 to the top of the second crankshaft 3. The position of the second crankshaft 3 is also determined by a laser tracker to ensure that the angle between the direction of the bent part of the first crankshaft 2 deviating from the axis of the first crankshaft 2 and the direction of the bent part of the second crankshaft 3 deviating from the axis of the second crankshaft 3 is 180°.
[0050] After adjusting the positions of the first crankshaft 2 and the second crankshaft 3, the coupling 4 on the first crankshaft 2 and the coupling 4 on the second crankshaft 3 can be connected to the two output shafts of the flying shear reducer 1 respectively, thus completing the replacement of the double crankshaft in the crank flying shear.
[0051] To ensure the consistency of phase and positional accuracy of the dual crankshafts in the crank flying shear, it is necessary to re-measure the positions of the first crankshaft 2 and the second crankshaft 3 to ensure the consistency of phase and positional accuracy of the first crankshaft 2 and the second crankshaft 3. The re-measurement steps include: determining that the line connecting the two first positioning holes 21 on the first crankshaft 2 is perpendicular to the horizontal line, and determining that the line connecting the two second positioning holes 31 on the second crankshaft 3 is perpendicular to the horizontal line.
[0052] It should be noted that during the crankshaft manufacturing process, two threaded holes are provided at the end of the crankshaft, see [link / reference]. Figure 2 The line connecting the two threaded holes is parallel to the direction in which the bent portion of the crankshaft deviates from the axis of the crankshaft. In this embodiment, two threaded holes are provided at the end of the crankshaft as positioning holes. When using a laser tracker to determine the position of the first crankshaft 2, the laser tracker can be used to accurately collect the line connecting the two first positioning holes 21 at the end of the first crankshaft 2. The line is then measured against the horizontal plane. When the line connecting the two first positioning holes 21 is perpendicular to the horizontal line, it indicates that the bent portion of the first crankshaft 2 is located directly below the first crankshaft 2.
[0053] Similarly, see Figure 3 The position of the second crankshaft 3 is determined to ensure that the angle between the direction in which the bent part of the first crankshaft 2 deviates from the axis of the first crankshaft 2 and the direction in which the bent part of the second crankshaft 3 deviates from the axis of the second crankshaft 3 is 180°.
[0054] After completing the retesting steps, record the angle value displayed on the encoder 5. This angle value is the reference angle value.
[0055] If the reference angle value is the same as the initial angle value, the double crankshaft phase adjustment of the crank flying shear is completed;
[0056] If the reference angle value is different from the initial angle value, adjust the encoder 5 so that the angle value displayed on the encoder 5 is equal to the initial angle value, so that the phase of the double crankshaft can be determined by the angle value displayed on the encoder 5 in the subsequent operation of the crank flying shear.
[0057] It should be noted that the difference between the initial angle value displayed by the encoder 5 and the reference angle value may be due to insufficient locking of the output shaft of the flying shear reducer 1, which may have caused the output shaft of the flying shear reducer 1 to change during the replacement process. Of course, it is also possible that the angle value displayed by the encoder 5 was inconsistent with the phase angle of crankshaft A and crankshaft B before the replacement. Neither of these situations will affect the determination of the phase of the first crankshaft 2 and the second crankshaft 3.
[0058] To better secure the flying shear reducer 1, in some embodiments, a mechanical brake is used to lock the output shaft of the flying shear reducer 1 to prevent the position of the output shaft of the flying shear reducer 1 from changing during the replacement of the hyperboloid; preferably, the mechanical brake is a clamping brake, which clamps the output shaft of the flying shear reducer 1 to prevent the position of the output shaft of the flying shear reducer 1 from changing during the replacement of the hyperboloid.
[0059] In some embodiments, additional pads are used to lock the output shaft of the flying shear reducer 1; wherein, there are two pads, which are respectively attached to both sides of the output shaft of the flying shear reducer 1 to prevent the output shaft of the flying shear reducer 1 from rotating.
[0060] Through the above embodiments, this application has the following beneficial effects or advantages:
[0061] 1) The phase adjustment method of this double crankshaft can quickly and accurately complete the phase adjustment of the double crankshaft in the crank flying shear, ensuring the phase consistency and positional accuracy of the first crankshaft 2 and the second crankshaft 3. Moreover, the coupling 4 can be installed before the first crankshaft 2 and the second crankshaft 3 arrive at the site, saving the step of disassembling and assembling the coupling 4 on site, thereby improving the replacement efficiency of the double crankshaft.
[0062] 2) In the phase adjustment method of the double crankshaft, after the initial angle value displayed by the encoder 5 is checked against the reference angle value, the operator can determine the phase of the double crankshaft by the angle value displayed by the calibrated encoder 4, so that the operator can better understand the working status of the crank flying shear.
[0063] Preferred embodiments of this application have been described, but those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.
[0064] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.
Claims
1. A phase adjustment method for a hypercrankshaft, characterized in that, The method is used for phase adjustment during the replacement process of a double crankshaft in a crank flying shear. The double crankshaft before replacement includes crankshaft A and crankshaft B, and the double crankshaft after replacement includes a first crankshaft (2) and a second crankshaft (3). The method includes the following steps: Adjust the angle between the direction of the bent part of crankshaft A away from the axis of crankshaft A and the direction of the bent part of crankshaft B away from the axis of crankshaft B to 180°, and record the angle value displayed on the encoder (5) on the flying shear reducer as the initial angle value; Lock the output shaft of the flying shear reducer (1); Disassemble crankshaft A and crankshaft B; Install the first crankshaft (2) and the second crankshaft (3); Adjust the phase of the first crankshaft (2) so that the bent part of the first crankshaft (2) rotates to a side away from the second crankshaft (3); Adjust the phase of the second crankshaft (3) so that the bent part of the second crankshaft (3) rotates to a side away from the first crankshaft (2). Ensure, by measuring equipment, that the angle between the direction of the bent part of the first crankshaft (2) deviating from the axis of the first crankshaft (2) and the direction of the bent part of the second crankshaft (3) deviating from the axis of the second crankshaft (3) is 180°. After connecting the two output shafts of the flying shear reducer (1) to the first crankshaft (2) and the second crankshaft (3) respectively, a laser tracker is used to re-measure the phase of the first crankshaft (2) and the second crankshaft (3). The re-measurement step includes: determining that the line connecting the two first positioning holes (21) on the first crankshaft (2) is perpendicular to the horizontal line, and determining that the line connecting the two second positioning holes (31) on the second crankshaft (3) is perpendicular to the horizontal line.
2. The phase adjustment method for a hypercrankshaft according to claim 1, characterized in that, Adjusting the phase of the first crankshaft (2) includes the following steps: Rotate the first crankshaft (2) around its axis so that the line connecting the two first positioning holes (21) on the first crankshaft (2) is perpendicular to the horizontal line.
3. The phase adjustment method for a hypercrankshaft according to claim 2, characterized in that, The angle between the line connecting the two first positioning holes (21) and the horizontal line is determined by a laser tracker.
4. The phase adjustment method for a hypercrankshaft according to claim 1, characterized in that, Adjusting the phase of the second crankshaft (3) includes the following steps: Rotate the second crankshaft (3) around its axis so that the line connecting the two second positioning holes (31) on the second crankshaft (3) is perpendicular to the horizontal line.
5. The phase adjustment method for a hypercrankshaft according to claim 4, characterized in that, The angle between the line connecting the two second positioning holes (31) and the horizontal line is determined by a laser tracker.
6. The phase adjustment method for a hypercrankshaft according to claim 1, characterized in that, After connecting the two output shafts of the flying shear reducer (1) to the first crankshaft (2) and the second crankshaft (3) respectively, record the angle value displayed on the encoder (5) on the flying shear reducer (1) as the reference angle value; The reference angle value is compared with the initial angle value. If the initial angle value is different from the reference angle value, the phase of the first crankshaft (2) and the second crankshaft (3) is re-measured using a laser tracker. When it is determined that the angle between the direction of the bending part of the first crankshaft (2) deviating from the axis of the first crankshaft (2) and the direction of the bending part of the second crankshaft (3) deviating from the axis of the second crankshaft (3) is 180°, the code disk (5) is adjusted so that the angle value displayed by the code disk (5) is equal to the initial angle value.
7. The phase adjustment method for a hypercrankshaft according to claim 1, characterized in that, The output shaft of the flying shear reducer (1) is locked by a clamping device.
8. The phase adjustment method for a hypercrankshaft according to claim 7, characterized in that, The clamping device includes a mechanical brake and a pad.
Citation Information
Patent Citations
Double-crank frame type flying shears
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Start-stop type crank cold flying shear
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