Phase adjustment method for double crankshafts

Abstract

The invention discloses a phase adjustment method for double crankshafts. The technical problems that in a crank flying shear in the prior art, the replacement difficulty of an upper crankshaft and a lower crankshaft is large, efficiency is low, and phase precision is low are solved. The method comprises the following steps: installing a first crankshaft and a second crankshaft; the positions of the first crankshaft and the second crankshaft are adjusted, so that the included angle between the direction, deviating from the axis of the first crankshaft, of the bent part of the first crankshaft and the direction, deviating from the axis of the second crankshaft, of the bent part of the second crankshaft is 180 degrees; and two output shafts of the flying shear speed reducer are connected with the first crankshaft and the second crankshaft correspondingly, and replacement of the double crankshafts is completed. According to the phase adjustment method for the double crankshafts, phase adjustment of the double crankshafts in the crank flying shear can be rapidly and accurately completed, phase consistency and position precision of the first crankshaft and the second crankshaft are guaranteed, the coupler can be installed before the first crankshaft and the second crankshaft enter a field, the step of disassembling and assembling the coupler on site is omitted, and the production efficiency is improved. The replacement efficiency of the double crankshafts is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of hot rolling production line flying shear equipment maintenance, and specifically relates to a phase adjustment method for a double crankshaft. Background Art

[0002] Flying shear equipment is an important equipment of hot rolling production line. During the reciprocating rolling process of the hot rolled strip in the roughing mill, the head and tail of the intermediate billet will be abnormally extended due to the influence of the width reduction, resulting in irregular morphology of the head and tail of the intermediate billet, which has a great impact on the threading and rolling stability of the finishing mill. The main function of the flying shear equipment is to cut the head and tail of the intermediate billet entering the finishing mill to ensure the head and tail shape of the finished mill products and the threading and rolling stability.

[0003] Crank flying shear is a widely used flying shear equipment in wide and thin hot rolling production lines. It drives the upper and lower crankshafts to move simultaneously through a reducer with two synchronous output shafts. The reducer is equipped with a position detection encoder to detect the actual phase angle of the crankshaft. The upper and lower crankshafts are respectively connected to the upper and lower cutter heads, and the upper and lower cutter heads are driven to engage with each other to achieve the shearing of the strip. Therefore, the consistency of the rotation angle of the upper and lower crankshafts and the position accuracy are crucial to the shearing accuracy of the flying shear. During the crankshaft replacement process, how to ensure the phase consistency and position accuracy of the upper and lower crankshafts has become a difficult task.

[0004] At present, during the crankshaft replacement process, the limit positions of the upper and lower crankshafts are determined by visual inspection, and after the positions are determined, the phase marks are printed in advance on the coupling connecting the crank and the output shaft of the reducer; after the crankshaft is replaced, the marked coupling needs to be removed and installed on the new crankshaft, and the phase before and after the crankshaft is replaced is determined by using the pre-printed phase marks; since the coupling is difficult to disassemble and install on site and the construction time is long, the crankshaft replacement efficiency is reduced.

[0005] At the same time, the method of determining the limit positions of the upper and lower crankshafts by manual visual inspection has certain human errors, which has a certain impact on the phase accuracy of the flying shear. Therefore, inventing a replacement method that can reduce the difficulty of crankshaft replacement and improve the phase accuracy of the flying shear is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a phase adjustment method for a double crankshaft to solve the technical problems of difficulty in replacing the upper and lower crankshafts, low efficiency and low phase accuracy in the crank flying shear in the prior art.

[0007] The technical solution adopted to achieve the purpose of this application is:

[0008] A method for adjusting the phase of a double crankshaft, the method is used for adjusting the phase of a double crankshaft replacement process in a crank flying shear, the replaced double crankshaft comprises a first crankshaft and a second crankshaft; the method comprises the following steps:

[0009] installing the first crankshaft and the second crankshaft;

[0010] adjusting 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] Adjusting the phase of the second crankshaft so that the bent portion of the second crankshaft rotates to a side away from the first crankshaft, and ensuring by measuring equipment 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] In order to better implement the present application, further optimization is made in the above method, and adjusting the phase of the first crankshaft includes the following steps:

[0014] The first crankshaft is rotated around the axis of the first crankshaft so that a line connecting two first positioning holes on the first crankshaft is perpendicular to a horizontal line.

[0015] In order to better implement the present application, the above method is further optimized, and the angle between the line connecting the two first positioning holes and the horizontal line is determined by a laser tracker.

[0016] In order to better implement the present application, further optimization is made in the above method, and adjusting the phase of the second crankshaft includes the following steps:

[0017] The second crankshaft is rotated around the axis of the second crankshaft so that a line connecting two second positioning holes on the second crankshaft is perpendicular to a horizontal line.

[0018] In order to better implement the present application, further optimization is made in the above method, and the angle between the line connecting the two second positioning holes and the horizontal line is determined by a laser tracker.

[0019] In order to better implement the present application, the above method is further optimized, and after the two output shafts of the flying shear reducer are connected to the first crankshaft and the second crankshaft respectively, a laser tracker is used to re-measure the phases of the first crankshaft and the second crankshaft;

[0020] The re-measurement step includes: determining that a line connecting two first positioning holes on the first crankshaft is perpendicular to a horizontal line, and determining that a line connecting two second positioning holes on the second crankshaft is perpendicular to the horizontal line.

[0021] In order to better implement the present application, further optimization is made in the above method, wherein 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 in which the bent portion of the crankshaft A deviates from the axis of the crankshaft A and the direction in which the bent portion of the crankshaft B deviates from the axis of the crankshaft B to 180°, and record the angle value displayed by the encoder on the flying shear reducer as the initial angle value;

[0023] Lock the output shaft of the flying shear reducer;

[0024] The crankshaft A and the crankshaft B are disassembled.

[0025] In order to better implement the present application, the above method is further optimized. After the two output shafts of the flying shear reducer are connected to the first crankshaft and the second crankshaft respectively, the angle value displayed by the code disk on the flying shear reducer is recorded as the reference angle value;

[0026] The reference angle value is verified and compared with the initial angle value. If the initial angle value is different from the reference angle value, a laser tracker is used to remeasure the phases of the first crankshaft and the second crankshaft. When it is determined 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°, the code disk is adjusted so that the angle value displayed by the code disk is equal to the initial angle value.

[0027] In order to better realize the present application, the above method is further optimized by locking the output shaft of the flying shear reducer through the clamping device.

[0028] In order to better implement the present application, further optimization is made in the above method, and the clamping device includes a mechanical brake and a pad.

[0029] It can be seen from the above technical scheme that the phase adjustment method of the double crankshaft provided by the present application can quickly and accurately complete the adjustment of the double crankshaft phase in the crank flying shear, ensure the phase consistency and position accuracy of the first crankshaft and the second crankshaft, and complete the installation of the coupling before the first crankshaft and the second crankshaft enter the site, eliminating the steps of disassembling and assembling the coupling on site, so as to improve the replacement efficiency of the double crankshaft;

[0030] In addition, the position accuracy and phase angle consistency of the first crankshaft and the second crankshaft play an important role in the shearing accuracy of the crank flying shear, which can effectively improve the shearing accuracy of the crank flying shear and reduce the cutting loss of the intermediate billet in the hot rolling production line to reduce material loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the crank shear recorded in the embodiment of the present application;

[0032] Figure 2 It is a structural schematic diagram of the end surface of the first crankshaft recorded in the embodiment of the present application;

[0033] Figure 3 It is a schematic structural diagram of the end surface of the second crankshaft described in the embodiment of the present application.

[0034] Description of reference numerals:

[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 DESCRIPTION

[0036] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] In the embodiment of the present application, the phase adjustment method of the double crankshaft is mainly used for phase adjustment of the double crankshaft replacement process in the crank flying shear; wherein, in order to better illustrate the entire replacement process, the double crankshafts before replacement are crankshaft A and crankshaft B, that is, crankshaft A and crankshaft B are worn crankshafts, and the double crankshafts after replacement are the first crankshaft 2 and the second crankshaft 3, that is, the first crankshaft 2 and the second crankshaft 3 are new crankshafts, that is, the phase adjustment method of the double crankshaft provided in the present application is a method for adjusting the phase of the first crankshaft 2 and the second crankshaft 3 after replacing crankshaft A and crankshaft B with the first crankshaft 2 and the second crankshaft 3;

[0038] The phase adjustment method of the double crankshaft comprises the following steps:

[0039] Adjust the angle between the direction in which the bent portion of crankshaft A deviates from the axis of crankshaft A and the direction in which the bent portion of crankshaft B deviates from the axis of crankshaft B to 180°, that is, expand the opening of the upper cutter head and the lower cutter head to the maximum, and record the angle value displayed on the code disk 5 in the flying shear reducer 1 at this time, and record the angle value as the initial angle value;

[0040] At the same time, the output shaft of the flying shear reducer 1 is fixed;

[0041] Since the interior of the flying shear reducer 1 is a mechanical synchronous structure, see 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 an output shaft of the flying shear reducer 1 located close to 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 the crankshaft A and the crankshaft B can be removed;

[0043] In the process of removing the coupling 4, only the end of the coupling 4 connected to the output shaft of the flying shear reducer 1 can be removed, because when the crankshaft A and the crankshaft B are removed, the coupling 4 can be replaced together with the crankshaft A and the crankshaft B;

[0044] After removing the coupling 4, the staff can take out the crankshaft A and the crankshaft B from the crankcase, and install the prepared first crankshaft 2 and the second crankshaft 3 in 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 there is no need to locate the phases 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, thereby eliminating the steps of disassembling / installing the coupling 4 during the replacement process, thereby improving the replacement efficiency of the double crankshaft;

[0046] After completing the installation of the first crankshaft 2 and the second crankshaft 3, the staff 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 a side away from the second crankshaft 3; in this embodiment, the first crankshaft 2 is located at a mounting position below the crankcase, and the second crankshaft 3 is located at a position above the crankcase, so that the axis of the first crankshaft 2 and the axis of the second crankshaft 3 are located in the same vertical plane;

[0048] When adjusting the position of the first crankshaft 2, the bent portion of the first crankshaft 2 can be rotated to the position directly below the first crankshaft 2. Of course, there will be a certain amount of human error in the position of the first crankshaft 2 by visual inspection. Here, a laser tracker can be used to determine the position accuracy of the first crankshaft 2.

[0049] After the position of the first crankshaft 2 is adjusted, the second crankshaft 3 is rotated, and the bent portion of the second crankshaft 3 is rotated to just above 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 in which the bent portion of the first crankshaft 2 deviates from the axis of the first crankshaft 2 and the direction in which the bent portion of the second crankshaft 3 deviates from the axis of the second crankshaft 3 is 180°.

[0050] After completing the adjustment of 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 to complete the replacement of the double crankshaft in the crank flying shear.

[0051] In order to ensure the phase consistency and position accuracy of the double 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 phase consistency and position accuracy of the first crankshaft 2 and the second crankshaft 3; wherein 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.

[0052] It should be noted that during the production process of the crankshaft, two threaded holes are provided at the end of the crankshaft, see 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; then, when using a laser tracker to determine the position of the first crankshaft 2, the laser tracker can be used to collect the line connecting the two first positioning holes 21 at the end of the first crankshaft 2, and the line is measured with 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 , determine the position of the second crankshaft 3 to ensure that the angle between the direction in which the bent portion of the first crankshaft 2 deviates from the axis of the first crankshaft 2 and the direction in which the bent portion of the second crankshaft 3 deviates from the axis of the second crankshaft 3 is 180°;

[0054] After completing the retest step, record the angle value displayed on the code disk 5, which is the reference angle value;

[0055] If the reference angle value is the same as the initial angle value, the adjustment of the double crankshaft phase of the crank flying shear is completed;

[0056] If the reference angle value is different from the initial angle value, the encoder 5 is adjusted to make the angle value displayed by the encoder 5 equal to the initial angle value, so that in the subsequent operation of the crank shear, the phase of the double crankshaft can be determined by the angle value displayed on the encoder 5.

[0057] It should be noted that the situation in which the initial angle value displayed by the code disk 5 is different from the reference angle value may be that the output shaft of the flying shear reducer 1 is insufficiently locked, resulting in the change of the output shaft of the flying shear reducer 1 during the replacement process; of course, it is also possible that before the replacement, the angle value displayed by the code disk 5 is inconsistent with the phase angle of crankshaft A and crankshaft B. Both situations do not affect the determination of the phase of the first crankshaft 2 and the second crankshaft 3.

[0058] In order to better fix 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 double crankshaft; preferably, the above-mentioned mechanical fixer is a holding brake, which holds the output shaft of the flying shear reducer 1 tightly to prevent the position of the output shaft of the flying shear reducer 1 from changing during the replacement of the double crankshaft;

[0059] In some embodiments, a pad is added 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, the present application has the following beneficial effects or advantages:

[0061] 1) The double crankshaft phase adjustment method can quickly and accurately complete the double crankshaft phase adjustment in the crank flying shear, ensure the phase consistency and position accuracy of the first crankshaft 2 and the second crankshaft 3, and the installation of the coupling 4 can be completed before the first crankshaft 2 and the second crankshaft 3 enter the site, eliminating the steps of disassembling and assembling the coupling 4 on site, so as to improve the replacement efficiency of the double crankshaft.

[0062] 2) After the initial angle value displayed by the code disk 5 in the phase adjustment method of the hyperbolic crankshaft is calibrated with the reference angle value, the staff can determine the phase of the hyperbolic crankshaft through the angle value displayed by the calibrated code disk 4, so that the staff can better understand the working status of the crank shear.

[0063] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for adjusting the phase of a double crankshaft, characterized in that: The method is used for phase adjustment in a double crankshaft replacement process in a crank flying shear, wherein the replaced double crankshaft comprises a first crankshaft (2) and a second crankshaft (3); the method comprises the following steps: Installing the first crankshaft (2) and the second crankshaft (3); Adjusting the phase of the first crankshaft (2) so that the bent portion of the first crankshaft (2) rotates to a side away from the second crankshaft (3); Adjusting the phase of the second crankshaft (3) so that the bent portion of the second crankshaft (3) rotates to a side away from the first crankshaft (2), and ensuring by measuring equipment that the angle between the direction in which the bent portion of the first crankshaft (2) deviates from the axis of the first crankshaft (2) and the direction in which the bent portion of the second crankshaft (3) deviates from the axis of the second crankshaft (3) is 180°; The two output shafts of the flying shear reducer (1) are respectively connected to the first crankshaft (2) and the second crankshaft (3).

2. The method for adjusting the phase of a double crankshaft according to claim 1, characterized in that: Adjusting the phase of the first crankshaft (2) comprises the following steps: The first crankshaft (2) is rotated around the axis of the first crankshaft (2) so that a line connecting two first positioning holes (21) on the first crankshaft (2) is perpendicular to a horizontal line.

3. The method for adjusting the phase of a double crankshaft 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 method for adjusting the phase of a double crankshaft according to claim 1, characterized in that: Adjusting the phase of the second crankshaft (3) comprises the following steps: The second crankshaft (3) is rotated around the axis of the second crankshaft (3) so that a line connecting two second positioning holes (31) on the second crankshaft (3) is perpendicular to a horizontal line.

5. The method for adjusting the phase of a double crankshaft according to claim 4, characterized in that: The angle between the connecting line of the two second positioning holes (31) and the horizontal line is determined by a laser tracker.

6. The method for adjusting the phase of a double crankshaft according to claim 1, characterized in that: After the two output shafts of the flying shear reducer (1) are connected to the first crankshaft (2) and the second crankshaft (3) respectively, a laser tracker is used to re-measure the phases of the first crankshaft (2) and the second crankshaft (3); The re-measurement step comprises: determining that a line connecting two first positioning holes (21) on the first crankshaft (2) is perpendicular to a horizontal line, and determining that a line connecting two second positioning holes (31) on the second crankshaft (3) is perpendicular to a horizontal line.

7. The method for adjusting the phase of a double crankshaft according to claim 6, characterized in that: The double crankshaft before replacement includes crankshaft A and crankshaft B; Before installing the first crankshaft (2) and the second crankshaft (3), the angle between the direction in which the bent portion of the crankshaft A deviates from the axis of the crankshaft A and the direction in which the bent portion of the crankshaft B deviates from the axis of the crankshaft B is adjusted to 180°, and the angle value displayed by the encoder (5) on the flying shear reducer is recorded as the initial angle value; Locking the output shaft of the flying shear reducer (1); The crankshaft A and the crankshaft B are disassembled.

8. The method for adjusting the phase of a double crankshaft according to claim 7, characterized in that: After the two output shafts of the flying shear reducer (1) are connected to the first crankshaft (2) and the second crankshaft (3) respectively, the angle value displayed by the code disk (5) on the flying shear reducer (1) is recorded as a reference angle value; The reference angle value is verified and 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 phases of the first crankshaft (2) and the second crankshaft (3). When it is determined that the angle between the direction in which the bent portion of the first crankshaft (2) deviates from the axis of the first crankshaft (2) and the direction in which the bent portion of the second crankshaft (3) deviates 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.

9. The method for adjusting the phase of a double crankshaft according to claim 7, characterized in that: The output shaft of the flying shear reducer (1) is locked by the clamping device.

10. The method for adjusting the phase of a double crankshaft according to claim 9, characterized in that: The clamping device includes a mechanical brake and a pad.

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