Method for adjusting the center line offset of a rolling mill stand

Abstract

The application provides a rolling mill stand unloading center line offset adjustment method, which comprises the following steps: a testing step of testing the offset of the rolling mill stand center line and the preset unloading center line; a marking step of marking the position of the rolling mill stand that needs to be adjusted on the unloading support pier at the bottom of the rolling mill stand according to the offset; an adjustment step of lifting the rolling mill stand, then lowering and adjusting the rolling mill stand according to the marked position of the rolling mill stand that needs to be adjusted; and a retesting step of testing whether the deviation between the rolling mill stand center line and the unloading center line meets the unloading requirement, and if yes, the adjustment is completed. The application can effectively ensure that the deviation between the rolling mill stand center line and the unloading center line meets the unloading requirement, ensure the position accuracy of the rolling mill stand unloading, is simple to operate, improves the adjustment efficiency, saves the cost without using a large crane, and solves the problem that the position of the rolling mill stand after unloading is not correct and cannot be adjusted.

Description

Technical Field

[0001] This invention relates to the field of equipment installation technology, and more specifically, to a method for adjusting the offset of the unloading centerline of a rolling mill stand. Background Technology

[0002] The extra-large rolling mill stand is quite heavy. When using a hydraulic axle truck for self-unloading, the rolling mill stand is transported to the unloading position. The axle truck lowers and places the rolling mill stand on the unloading support. The center line of the rolling mill stand is measured against the unloading center line. There is a large offset between the center line of the stand and the unloading center line, which does not meet the unloading requirements and cannot be adjusted after unloading. Summary of the Invention

[0003] In view of this, the present invention proposes a method for adjusting the offset of the unloading center line of the rolling mill stand, which aims to solve the problem in the prior art that the deviation between the center line of the rolling mill stand and the unloading center line after the rolling mill stand is placed on the unloading support does not meet the unloading requirements.

[0004] This invention proposes a method for adjusting the offset of the unloading centerline of a rolling mill stand. The method includes the following steps: a testing step, testing the offset between the centerline of the rolling mill stand and a pre-set unloading centerline; a marking step, marking the position to be adjusted on the unloading support at the bottom of the rolling mill stand according to the offset; an adjustment step, lifting the rolling mill stand, and then lowering and adjusting it according to the marked position; and a retesting step, testing whether the deviation between the centerline of the rolling mill stand and the unloading centerline meets the unloading requirements. If they do, the adjustment is complete.

[0005] Furthermore, in the above-mentioned method for adjusting the offset of the unloading centerline of the rolling mill stand, the testing steps further include: a selection sub-step, in which a reference point is selected on the top surface of the rolling mill stand; a setting sub-step, in which an auxiliary centerline is set at a first preset distance from the unloading centerline, the auxiliary centerline being parallel to the unloading centerline; a measurement sub-step, in which the actual distance between the auxiliary centerline and the reference point is measured; and a calculation sub-step, in which the deviation value between the measured actual distance and the theoretical distance is calculated, and the deviation direction of the rolling mill stand centerline is determined.

[0006] Furthermore, in the above-mentioned method for adjusting the offset of the unloading center line of the rolling mill stand, in the selected sub-step, a reference point is set on the top surface of the stand at a second preset distance from the side machined surface of the rolling mill stand, and the reference point corresponds to the part of the rolling mill stand hoisting fixture.

[0007] Furthermore, in the above-mentioned method for adjusting the offset of the unloading centerline of the rolling mill stand, in the calculation sub-step, the theoretical distance is the sum of the design distance between the side machining surface of the rolling mill stand and the auxiliary centerline and the second preset distance.

[0008] Furthermore, in the above-mentioned method for adjusting the offset of the unloading centerline of the rolling mill stand, in the marking step, based on the calculated deviation value and the determined deviation direction, the position of the rolling mill stand that needs to be adjusted is marked on the unloading support. The position of the rolling mill stand that needs to be adjusted is the position at the deviation value in the direction opposite to the deviation direction.

[0009] Furthermore, in the above-mentioned method for adjusting the offset of the unloading center line of the rolling mill stand, in the adjustment step, the rolling mill stand is lifted up by a transport vehicle, and then the rolling mill stand is adjusted to a horizontal state.

[0010] Furthermore, in the above-mentioned method for adjusting the offset of the unloading centerline of the rolling mill stand, in the adjustment step, according to the marked position of the rolling mill stand that needs to be adjusted, the hydraulic system of the transport vehicle is used to first lower one side of the rolling mill stand, and then lower the other side of the rolling mill stand. This lowering process is repeated until the position of the rolling mill stand on the unloading support coincides with the position of the rolling mill stand that needs to be adjusted.

[0011] Furthermore, in the above-mentioned method for adjusting the offset of the unloading centerline of the rolling mill stand, the side of the rolling mill stand that descends first is the side in the opposite direction to the offset direction.

[0012] Furthermore, in the above-mentioned method for adjusting the offset of the unloading centerline of the rolling mill stand, the distance the rolling mill stand descends each time is equal.

[0013] Furthermore, in the above-mentioned method for adjusting the offset of the unloading center line of the rolling mill stand, if the deviation between the center line of the rolling mill stand and the unloading center line does not meet the unloading requirements during the retesting step, the adjustment and retesting steps are repeated until the deviation between the center line of the rolling mill stand and the unloading center line meets the unloading requirements, at which point the adjustment is stopped.

[0014] In this invention, based on the offset between the centerline of the rolling mill stand and the pre-set unloading centerline, the position of the rolling mill stand that needs adjustment is marked on the unloading support. Then, the raised stand is lowered and adjusted until the position of the rolling mill stand on the unloading support matches the marked position of the rolling mill stand that needs adjustment. The deviation between the centerline of the rolling mill stand and the unloading centerline is re-measured to see if it meets the unloading requirements. If it does, the adjustment is complete. In this way, it can effectively ensure that the deviation between the centerline of the rolling mill stand and the unloading centerline meets the unloading requirements, ensuring the accurate unloading position of the rolling mill stand. The operation is simple, the adjustment efficiency is improved, and there is no need to use a large crane, saving costs. It solves the problem in the prior art that the deviation between the centerline of the rolling mill stand and the unloading centerline does not meet the unloading requirements after the rolling mill stand is placed on the unloading support. It can also solve the problem that the position of the rolling mill stand is incorrect after unloading and cannot be adjusted. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0016] Figure 1 A flowchart illustrating the method for adjusting the offset of the unloading centerline of a rolling mill stand according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram illustrating the test of offset in the method for adjusting the offset of the unloading centerline of the rolling mill stand provided in an embodiment of the present invention.

[0018] Figure 3 A schematic diagram showing the position of the rolling mill stand to be adjusted in the method for adjusting the offset of the unloading center line of the rolling mill stand provided in an embodiment of the present invention;

[0019] Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle;

[0020] Figure 5 A side view of the unloading support marking the position of the rolling mill stand that needs to be adjusted in the method for adjusting the offset of the unloading center line of the rolling mill stand provided in the embodiment of the present invention;

[0021] Figure 6 A schematic diagram of the mill stand not being lifted in the method for adjusting the offset of the unloading center line of the mill stand provided in the embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the mill stand after it has not been lifted, in the method for adjusting the offset of the unloading center line of the mill stand provided in the embodiment of the present invention.

[0023] Figure 8 A schematic diagram of the measuring points in the method for adjusting the offset of the unloading center line of the rolling mill stand provided in an embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of the method for adjusting the offset of the unloading center line of the rolling mill stand provided in an embodiment of the present invention;

[0025] Figure 10 A schematic diagram of lowering and adjusting the mill stand in the method for adjusting the offset of the unloading center line of the mill stand provided in an embodiment of the present invention;

[0026] Figure 11 This is a schematic diagram illustrating the re-measurement of the offset in the method for adjusting the offset of the unloading centerline of the rolling mill stand provided in an embodiment of the present invention.

[0027] Figure 12This is a schematic diagram of the side view of the unloading support during retesting in the method for adjusting the offset of the unloading center line of the rolling mill stand provided in an embodiment of the present invention. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] See Figure 1 , Figure 1 A flowchart illustrating the method for adjusting the offset of the unloading centerline of a rolling mill stand according to an embodiment of the present invention. As shown in the figure, the method for adjusting the offset of the unloading centerline of a rolling mill stand includes the following steps:

[0030] Test step S1: Test the offset between the center line of the rolling mill stand and the pre-set unloading center line.

[0031] Specifically, test step S1 further includes:

[0032] Select sub-step S11 to select a reference point on the top surface of the rolling mill stand.

[0033] Specifically, see Figure 2 A reference point 7 is set on the top surface of the mill stand at a second preset distance from the side machined surface of the mill stand. Reference point 7 corresponds to the location of the mill stand lifting fixture. In other words, reference point 7 is set on the top surface of the mill stand, and there is a second preset distance between the reference point and the side machined surface of the mill stand, where the side machined surface of the mill stand is predetermined by the mill stand itself. Simultaneously, reference point 7 must also correspond to the location of the mill stand lifting fixture.

[0034] In practice, the second preset distance can be determined according to the actual situation, and this embodiment does not impose any restrictions on it. In this embodiment, the second preset distance is 30mm.

[0035] In this embodiment, the clamping part of the future hoisting of the rolling mill stand is used as the reference point. Since it is not easy to install prisms on the side of the rolling mill stand, the side machined surface of the rolling mill stand is used as the reference, and reference point 7 is marked on the upper surface of the stand at a distance of 30mm from the side machined surface of the rolling mill stand.

[0036] See Figure 2 The frame 5 is placed on the transport vehicle 6.

[0037] In sub-step S12, an auxiliary centerline is set at a first preset distance from the unloading centerline, and the auxiliary centerline is parallel to the unloading centerline.

[0038] Specifically, the unloading centerline is pre-set and can be marked on the ground. The first preset distance can be determined according to the actual situation, and this embodiment does not impose any restrictions on it.

[0039] See Figure 2 Using the unloading center line 1 as a reference, an auxiliary center line 2 is set at a first preset distance, and the auxiliary center line 2 is parallel to the unloading center line 1.

[0040] Measurement sub-step S13: Measure the actual distance between the auxiliary centerline and the reference point.

[0041] Specifically, the actual distance between the auxiliary center line 2 and the reference point 7 is measured using a total station.

[0042] In sub-step S14, the deviation between the measured actual distance and the theoretical distance is calculated, and the deviation direction of the mill stand centerline is determined.

[0043] Specifically, the theoretical distance is the sum of the design distance between the side machined surface of the rolling mill stand and the auxiliary center line, and the second preset distance. Based on the deviation between the measured actual distance and the theoretical distance, it is determined whether the deviation meets the unloading requirements. If not, the following steps are continued.

[0044] For example, see Figure 2 The design distance between the side machined surface of the rolling mill stand and the auxiliary center line plus the second preset distance, i.e. the theoretical distance, is denoted as Y. The actual distance between the auxiliary center line and the reference point is 30mm more than the theoretical distance Y. The rolling mill stand is generally biased to the right, so the rolling mill stand needs to be adjusted to the left by 30mm.

[0045] In step S2, based on the offset, mark the position of the rolling mill stand that needs to be adjusted on the unloading support at the bottom of the rolling mill stand.

[0046] Specifically, see Figures 3 to 5 Based on the calculated deviation value and the determined deviation direction, mark the position 8 of the rolling mill frame that needs to be adjusted on the unloading support 4. The position 8 of the rolling mill frame that needs to be adjusted is the position at the deviation value in the direction opposite to the deviation direction.

[0047] For example, if the rolling mill stand is 30mm off to the right, the rolling mill stand needs to be adjusted 30mm to the left. Mark the position 30mm to the left on the unloading support 4 so that the rolling mill position can be observed during subsequent adjustments.

[0048] In step S3, lift the mill stand, then lower and adjust it according to the marked position of the mill stand that needs to be adjusted.

[0049] Specifically, see Figure 6 and Figure 7 The mill stand is lifted using transport vehicle 6, and then adjusted to a horizontal position. For more details, see... Figure 8 The hydraulic system on the transport vehicle 6 is used to lift the mill stand to the highest point. After lifting it to the highest point, a level is used to measure the measuring points 9 at the four corners of the mill stand. The mill is then adjusted through the hydraulic system to ensure that the mill stand is in a horizontal state.

[0050] According to the marked position 8 of the rolling mill stand that needs to be adjusted, the hydraulic system of the transport vehicle 6 is used to lower one side of the rolling mill stand first, and then lower the other side of the rolling mill stand. This lowering process is repeated until the position of the rolling mill stand on the unloading support 4 coincides with the position 8 of the rolling mill stand that needs to be adjusted.

[0051] Specifically, see Figure 9 The transport vehicle 6 descends using an unbalanced descent method, first lowering the first side of the rolling mill stand, then the second side, then the first side again, then the second side again, and so on. The operators observe the position of the rolling mill stand relative to the markings, and by repeating the above operations, the rolling mill stand is shifted into position as a whole and the descent is completed.

[0052] Preferably, the side of the mill stand that descends first is the side opposite to the direction of deviation. Specifically, the side of the mill stand that is in the positive position is descended first, and when the mill stand tilts, it will make a slight displacement in the direction of the initial tilt. For example, if the mill stand needs to be adjusted 30mm to the left as a whole, the left side of the mill stand will descend first.

[0053] Preferably, the rolling mill stand descends the same distance each time.

[0054] In practice, when using the unbalanced descent method, it is necessary to control the tilt angle of the frame. When the angle is too large, the negative side needs to fall back a certain height to maintain the stability of the frame.

[0055] In step S4, test whether the deviation between the center line of the rolling mill stand and the center line of the unloading meets the unloading requirements. If they meet the requirements, the adjustment is complete.

[0056] Specifically, see Figures 10 to 12 Use a total station to remeasure the actual distance between the auxiliary center line 2 and the reference point 7, calculate the deviation between the measured actual distance and the theoretical distance, and judge whether the deviation between the mill stand center line 3 and the unloading center line 1 meets the unloading requirements based on the calculated deviation value. If it does, the adjustment is completed.

[0057] If the deviation between the center line 3 of the rolling mill stand and the center line 1 of the unloading does not meet the unloading requirements, repeat adjustment step S3 and retest step S4 until the deviation between the center line 3 of the rolling mill stand and the center line 1 of the unloading meets the unloading requirements, then stop adjusting.

[0058] As can be seen, in this embodiment, based on the offset between the center line of the rolling mill stand and the pre-set unloading center line, the position of the rolling mill stand that needs adjustment is marked on the unloading support. Then, the raised stand is lowered and adjusted until the position of the rolling mill stand on the unloading support matches the marked position of the rolling mill stand that needs adjustment. The deviation between the center line of the rolling mill stand and the unloading center line is re-measured to see if it meets the unloading requirements. If it does, the adjustment is complete. In this way, it can effectively ensure that the deviation between the center line of the rolling mill stand and the unloading center line meets the unloading requirements, ensuring the accurate unloading position of the rolling mill stand. The operation is simple, the adjustment efficiency is improved, and there is no need to use a large crane, saving costs. It solves the problem in the prior art that the deviation between the center line of the rolling mill stand and the unloading center line does not meet the unloading requirements after the rolling mill stand is placed on the unloading support. It can also solve the problem that the position of the rolling mill stand is incorrect after unloading and cannot be adjusted. This method utilizes the transport vehicle's own hydraulic system to adjust the centerline offset of the rolling mill stand after unloading through unbalanced unloading. This method can adjust the centerline offset of extra-large rolling mill stands after unloading without additional lifting equipment.

[0059] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0060] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for adjusting the offset of the unloading centerline of a rolling mill stand, characterized in that, Includes the following steps: The test procedure involves testing the offset between the centerline of the rolling mill stand and the pre-set unloading centerline. The marking step involves marking the position where the rolling mill stand needs to be adjusted on the unloading support at the bottom of the rolling mill stand, based on the offset. The adjustment steps involve lifting the mill stand, then lowering and adjusting the mill stand according to the marked adjustment positions. The retesting step involves testing whether the deviation between the center line of the rolling mill stand and the unloading center line meets the unloading requirements. If it does, the adjustment is complete. The testing steps further include: Select a sub-step: Select a reference point on the top surface of the rolling mill stand; A sub-step is set up to set an auxiliary center line at a first preset distance from the unloading center line, the auxiliary center line being parallel to the unloading center line; The measurement sub-step involves measuring the actual distance between the auxiliary centerline and the reference point; The calculation sub-step calculates the deviation between the measured actual distance and the theoretical distance, and determines the deviation direction of the center line of the rolling mill stand.

2. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 1, characterized in that, In the selection sub-step The reference point is set on the top surface of the mill stand at a second preset distance from the side machined surface of the mill stand, and the reference point corresponds to the part of the mill stand hoisting fixture.

3. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 2, characterized in that, In the calculation sub-step The theoretical distance is the sum of the design distance between the side machined surface of the rolling mill stand and the auxiliary center line and the second preset distance.

4. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 1, characterized in that, In the marking step Based on the calculated deviation value and the determined deviation direction, the position where the rolling mill stand needs to be adjusted is marked on the unloading support. The position where the rolling mill stand needs to be adjusted is the position at the deviation value in the direction opposite to the deviation direction.

5. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 4, characterized in that, In the adjustment steps The mill stand is lifted using a transport vehicle and then adjusted to a horizontal position.

6. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 5, characterized in that, In the adjustment steps According to the marked position of the rolling mill stand that needs to be adjusted, the hydraulic system of the transport vehicle is used to lower one side of the rolling mill stand first, then lower the other side of the rolling mill stand, and repeat the lowering process until the position of the rolling mill stand on the unloading support coincides with the position of the rolling mill stand that needs to be adjusted.

7. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 6, characterized in that, The side of the rolling mill stand that descends first is the side opposite to the deviation direction.

8. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 6, characterized in that, The rolling mill stand descends the same distance each time.

9. The method for adjusting the offset of the unloading centerline of the rolling mill stand according to claim 1, characterized in that, In the retesting step If the deviation between the center line of the rolling mill stand and the center line of the unloading does not meet the unloading requirements, repeat the adjustment steps and the retest steps until the deviation between the center line of the rolling mill stand and the center line of the unloading meets the unloading requirements, then stop the adjustment.

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