Three-roll continuous rolling mill locking device

Abstract

The application discloses a three-roller continuous rolling mill locking device, which comprises a locking rod capable of sliding through a rolling mill housing, a locking inclined plane is arranged on the side wall of the first end of the locking rod, the locking inclined plane can slide out of the rolling mill housing, and the locking inclined plane is used for pressing against the inclined plane of the locked mill stand; and the second end of the locking rod is flexibly connected with a locking power structure through a joint accommodating groove and a locking joint. The application decomposes the thrust of the locking power structure into an axial component force and a force along the rolling center line through the inclined plane contact, flexibly connects the locking rod with the locking power structure, reduces the impact damage caused by the rigid connection, prolongs the service life of the locking power structure, is convenient to maintain, and overcomes the problems in the prior art.

Description

Technical Field

[0001] This invention relates to the field of hot rolling technology for seamless steel pipes, and more particularly to a locking device for a three-roll continuous rolling mill. Background Technology

[0002] Three-roll continuous rolling mills are used in seamless steel pipe hot rolling production lines to perform multi-pass rolling on the tube blanks. In a three-roll continuous rolling mill where rolls are changed along the rolling centerline, the roll stand is loaded inside the mill stand. After the stand is pushed into the mill stand along the rolling centerline and various parameters are adjusted, the stand needs to be locked along the rolling centerline, usually by hydraulic locking.

[0003] The mill locking device is an important component of the mill, which directly affects the stability of the mill operation and the accuracy of equipment positioning. When the axial locking effect of the stand is not good: (1) there will be gaps between the stands, and the limiting force cannot be transmitted to the mill stand; (2) the limiting force impact along the rolling line direction during steel pipe rolling is very large, which will cause the roll stands to collide with each other, generate vibration, affect product quality, and even damage the equipment.

[0004] Because the roll stand of an existing three-roll continuous rolling mill needs to move in and out of the archway tunnel for roll changing, the locking device requires a larger extension range to avoid interference and collision, resulting in a larger stroke than the hydraulic cylinder of a typical locking device. Therefore, the locking device adopts a structure with a hydraulic cylinder rod and a locking rod, and the locking rod has a machined bevel.

[0005] Existing technology 1: The existing cylinder rod and existing locking rod of the locking hydraulic cylinder are connected by threads. The extension and retraction of the hydraulic cylinder drives the extension and retraction of the existing locking rod, and the inclined surface on the existing locking rod contacts the inclined surface on the locked mill stand. The thrust of the hydraulic cylinder is along the direction of the existing locking rod. Through the contact of the inclined surfaces, the thrust is decomposed into two components: one along the rolling line direction and the other along the cylinder rod axis. This method achieves locking of the roll stand along the rolling direction. This technology has the following problems:

[0006] (1) The existing cylinder rod and the existing locking rod are connected by threads. Due to the large impact force and equipment vibration during steel rolling production, the threaded connection will loosen after long-term use. Regular inspection and maintenance are required to avoid equipment failure.

[0007] (2) The existing locking rod is subjected to impact force along the rolling center line. Since the existing cylinder rod and the existing locking rod are rigidly connected, the impact force is directly transmitted to the existing cylinder rod, causing damage to the hydraulic cylinder seal and the existing cylinder rod itself.

[0008] Existing technology two: The universal locking cylinder adopts a structure with an internal disc spring. The principle is that the disc spring locks and the hydraulic system opens the cylinder. Since both the radial and axial components of the force on the locking ramp act on the existing piston rod, the radial component is prone to deformation of the piston rod, and leakage is likely to occur at the seal. Therefore, the stroke of the hydraulic cylinder is relatively small. However, due to the structural limitations of three-roll continuous rolling mills, a large extension and retraction of the locking cylinder rod is required, making the universal locking cylinder unsuitable for this condition.

[0009] Therefore, based on years of experience and practice in related industries, the inventor proposes a locking device for a three-roll continuous rolling mill to overcome the shortcomings of the prior art. Summary of the Invention

[0010] The purpose of this invention is to provide a locking device for a three-roll continuous rolling mill, suitable for three-roll continuous rolling mills that change rolls along the rolling centerline. This invention decomposes the thrust of the locking power structure into a component force along the rolling centerline and an axial component force through inclined surface contact. The locking rod flexibly connects to the locking power structure, reducing the impact damage caused by rigid connection, improving the service life of the locking power structure, and facilitating maintenance, thus overcoming the problems existing in the prior art.

[0011] The objective of this invention is achieved as follows: a locking device for a three-roll continuous rolling mill includes a locking rod that can slide through the mill stand; a locking inclined plane is provided on the side wall of the first end of the locking rod; the locking inclined plane can slide out of the mill stand; the locking inclined plane is used to press against the inclined surface of the locked frame; the second end of the locking rod is flexibly connected to the locking power structure through a joint receiving groove and a locking joint.

[0012] In a preferred embodiment of the present invention, the connector receiving groove is provided inward from the second end of the locking rod, the second end of the locking rod is provided with a groove end opening, and the radial side of the connector receiving groove is provided with a groove side opening; the axial cross-section of the connector receiving groove is T-shaped, and the width of the groove end opening is smaller than the bottom width of the connector receiving groove; the locking connector can be inserted into the connector receiving groove through the groove side opening, and after the locking connector is inserted into the connector receiving groove, it is coaxial with the locking rod.

[0013] In a preferred embodiment of the present invention, the locking power structure includes a locking hydraulic cylinder, the locking hydraulic cylinder includes a locking cylinder barrel and a locking cylinder rod, the first end of the locking cylinder rod is connected to the locking connector, and the second end of the locking cylinder rod is slidably inserted into the locking cylinder barrel; the diameter of the first end of the locking cylinder rod is smaller than the diameter of the locking connector, and the first end of the locking cylinder rod forms a T-shaped structure after being connected to the locking connector.

[0014] In a preferred embodiment of the present invention, the second end of the locking rod is connected to an anti-loosening baffle, and an anti-rotation groove is provided on the side wall of the first end of the locking cylinder rod. The anti-loosening baffle can be locked in the anti-rotation groove to prevent the locking cylinder rod from rotating relative to the locking joint.

[0015] In a preferred embodiment of the present invention, the first end of the locking cylinder rod is threadedly connected to the locking connector; the locking cylinder is fixedly connected to the rolling mill stand.

[0016] In a preferred embodiment of the present invention, a locking through hole is provided on the mill stand, and the locking power structure drives the locking rod to slide along the locking through hole through the locking joint.

[0017] In a preferred embodiment of the present invention, a guide groove is provided axially on the side wall of the locking rod, and an anti-rotation pin is provided on the side wall of the locking through hole, wherein the guide groove can be slidably sleeved on the anti-rotation pin.

[0018] In a preferred embodiment of the present invention, a guide sleeve is provided inside the locking through hole, and the locking rod can slide through the guide sleeve.

[0019] In a preferred embodiment of the present invention, two guide sleeves are provided axially spaced within the locking through hole, and a spacer ring is provided axially between the two guide sleeves.

[0020] In a preferred embodiment of the present invention, the number of the three-roll continuous rolling mill locking devices is three, and the three three-roll continuous rolling mill locking devices are arranged at intervals along the circumference of the rolling mill stand; the central axis of the locking rod of one of the three-roll continuous rolling mill locking devices is arranged vertically, and the central axis of the locking rod of the two three-roll continuous rolling mill locking devices is arranged horizontally and is radially symmetrical about the rolling mill stand.

[0021] As described above, the locking device for a three-roll continuous rolling mill provided by the present invention has the following beneficial effects:

[0022] The locking device for a three-roll continuous rolling mill provided by the present invention decomposes the thrust of the locking power structure into a component force along the rolling centerline and an axial component force through inclined surface contact. The locking rod flexibly connects the locking power structure, reducing the impact damage caused by rigid connection and improving the service life of the locking power structure.

[0023] After the first end of the locking cylinder rod is connected to the locking connector, it forms a T-shaped structure. It is inserted into the T-shaped connector receiving groove. By adopting this "T"-shaped head connection structure, the locking hydraulic cylinder and the locking rod can achieve a flexible connection, reducing the impact of external forces on the hydraulic cylinder. It is a good measure to prevent loosening and transmit thrust, which can improve the reliability of the locking device of the three-roll continuous rolling mill.

[0024] An anti-loosening baffle is installed at the second end of the locking rod to restrict the rotation of the locking cylinder rod and to prevent the connection between the first end of the locking cylinder rod and the locking joint from loosening, thereby improving the working reliability and stability of the locking device of the three-roll continuous rolling mill.

[0025] The present invention has a simple structure, low manufacturing and installation costs, and is easy to maintain. The improved device can reduce equipment maintenance costs.

[0026] The locking device for a three-roll continuous rolling mill provided by this invention can be applied to seamless steel pipe production lines. It is suitable for three-roll continuous rolling mills that use roll changing along the rolling centerline. This invention can achieve locking of the roll stand along the rolling centerline. This invention is also suitable for other working conditions that require large stroke extension and retraction of the locking rod. A good guiding device can meet the requirements of long stroke locking. Attached Figure Description

[0027] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0028] Figure 1 : This is a schematic diagram of the locking device for the three-roll continuous rolling mill of the present invention.

[0029] Figure 2 : This is a schematic diagram of the locking rod of the present invention.

[0030] Figure 3 : This is a schematic diagram showing the usage state when the quantity of the present invention is three.

[0031] In the picture:

[0032] 100. Locking device for a three-roll continuous rolling mill;

[0033] 1. Locking rod;

[0034] 11. Locking inclined plane; 12. Connector receiving groove; 13. Guide groove;

[0035] 2. Locking connector;

[0036] 3. Locking power structure; 31. Locking cylinder; 32. Locking cylinder rod; 33. Anti-rotation groove;

[0037] 4. Anti-loosening baffle; 5. Locking through hole; 6. Guide sleeve; 7. Spacer ring; 8. Anti-rotation pin;

[0038] 91. Rolling Mill Archway. Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0040] The specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "linked" should be interpreted broadly; for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figures 1 to 3 As shown, the present invention provides a locking device 100 for a three-roll continuous rolling mill, including a locking rod 1 that can slide through the mill stand. In this embodiment, the locking rod 1 is a cylinder. A locking inclined plane 11 is provided on the side wall of the first end of the locking rod 1. The locking inclined plane 11 can slide out of the mill stand and is used to press against the inclined surface of the locked frame (existing technology). The second end of the locking rod 1 is flexibly connected to the locking power structure 3 through a joint receiving groove 12 and a locking joint 2.

[0043] The extension and retraction of the locking power structure 3 drives the extension and retraction of the locking joint 2 and the locking rod 1. The locking inclined plane 11 on the locking rod 1 presses against the inclined surface of the locked frame (the inclined surface of the locking block of the locked roll frame). Through the contact of the inclined surface, the thrust of the locking power structure 3 is decomposed into the component force along the rolling center line and the axial component force. The component force along the rolling center line is the locking force of the roll frame along the rolling center line.

[0044] In steel rolling production, the locking device of a three-roll continuous rolling mill affects the rolling accuracy and product quality. Improving the reliability of the locking device can reduce equipment failures, reduce equipment maintenance workload, and improve production efficiency.

[0045] The locking device for a three-roll continuous rolling mill provided by the present invention decomposes the thrust of the locking power structure into a component force along the rolling centerline and an axial component force through inclined surface contact. The locking rod flexibly connects the locking power structure, reducing the impact damage caused by rigid connection and improving the service life of the locking power structure.

[0046] The present invention has a simple structure, low manufacturing and installation costs, and is easy to maintain. The improved device can reduce equipment maintenance costs.

[0047] The locking device for a three-roll continuous rolling mill provided by this invention can be applied to seamless steel pipe production lines. It is suitable for three-roll continuous rolling mills that use roll changing along the rolling centerline. This invention can achieve locking of the roll stand along the rolling centerline. This invention is also suitable for other working conditions that require large stroke extension and retraction of the locking rod. A good guiding device can meet the requirements of long stroke locking.

[0048] Furthermore, such as Figure 1 , Figure 2 As shown, the connector receiving groove 12 is provided inward from the second end of the locking rod 1. The second end of the locking rod 1 has a groove end opening, and the radial side of the connector receiving groove 12 has a groove side opening. The axial cross-section of the connector receiving groove 12 is T-shaped, and the width of the groove end opening is smaller than the width of the groove bottom. The locking connector 2 can be inserted into the connector receiving groove 12 through the groove side opening. After being inserted into the connector receiving groove, the locking connector 2 is coaxial with the locking rod 1. The insertion of the locking connector 2 into the T-shaped connector receiving groove 12 achieves a flexible connection between the locking power structure 3 and the locking rod 1, and the radial force borne by the locking rod 1 cannot be rigidly transmitted to the locking power structure 3.

[0049] Furthermore, such as Figure 1 As shown, the locking power structure 3 includes a locking hydraulic cylinder, which comprises a locking cylinder barrel 31 and a locking cylinder rod 32. The first end of the locking cylinder rod 32 is connected to the locking connector 2, and the second end of the locking cylinder rod 32 slides through the locking cylinder barrel 31. The diameter of the first end of the locking cylinder rod 32 is smaller than the diameter of the locking connector 2, and the first end of the locking cylinder rod 32 forms a T-shaped structure after being connected to the locking connector 2. The locking power structure 3 can also be an electric structure or a pneumatic cylinder that can generate a pushing force on the locking rod 1.

[0050] After the first end of the locking cylinder rod 32 is connected to the locking connector 2, it forms a T-shaped structure. It is inserted into the T-shaped connector receiving groove 12. The structure of this "T"-shaped head connection enables the locking hydraulic cylinder and the locking rod to achieve flexible connection, reducing the impact of external forces on the hydraulic cylinder. It is a good measure to prevent loosening and transmit thrust, which can improve the reliability of the locking device 100 of the three-roll continuous rolling mill.

[0051] Furthermore, such as Figure 1As shown, the second end of the locking rod 1 is connected to an anti-loosening baffle 4, and an anti-rotation groove 33 is provided on the side wall of the first end of the locking cylinder rod 32. The anti-loosening baffle 4 can be locked in the anti-rotation groove 33 to prevent the locking cylinder rod from rotating relative to the locking joint 2. The anti-loosening baffle 4 (fixed by screws) installed at the second end of the locking rod 1 restricts the rotation of the locking cylinder rod 32 and restricts the loosening of the connection between the first end of the locking cylinder rod 32 and the locking joint 2, thereby improving the working reliability and stability of the locking device 100 of the three-roll continuous rolling mill.

[0052] In this embodiment, the first end of the locking cylinder rod is connected to the locking connector 2 via a thread; the locking cylinder 31 is fixedly connected to the rolling mill stand 91. In a specific embodiment of the present invention, the locking cylinder 31 is fixedly connected to the rolling mill stand 91 by bolts.

[0053] Furthermore, such as Figure 1 As shown, the locking device 100 of the three-roll continuous rolling mill also includes a locking through hole 5 provided on the mill stand 91. The locking power structure 3 drives the locking rod 1 to slide along the locking through hole 5 through the locking joint 2.

[0054] Furthermore, such as Figure 1 As shown, a guide sleeve 6 is provided inside the locking through hole 5, through which the locking rod 1 can slide. The guide sleeve 6 can withstand the radial force along the locking rod 1, which is beneficial for the long-stroke extension and retraction of the locking rod.

[0055] In this embodiment, two guide sleeves 6 are provided axially spaced inside the locking through hole 5, and a spacer ring 7 is provided axially between the two guide sleeves 6.

[0056] Furthermore, such as Figure 1 As shown, a guide groove 13 is provided axially on the side wall of the locking rod 1, and an anti-rotation pin 8 is provided on the side wall of the locking through hole 5. The guide groove 13 can be slidably sleeved on the anti-rotation pin 8, and the anti-rotation pin 8 can prevent the locking rod 1 and the locking cylinder rod 32 from rotating during extension and retraction.

[0057] When assembling the locking device 100 of the three-roll continuous rolling mill, the locking rod 1 is inserted into the locking through hole 5 of the mill stand 91. First, the direction of the locking inclined plane 11 of the locking rod 1 is adjusted to ensure that it can press against the inclined surface of the locked frame. Then, the anti-rotation pin 8 is installed on the mill stand 91 to prevent the locking rod 1 from rotating.

[0058] like Figure 3As shown, in a specific embodiment of the present invention, there are three locking devices 100 for the three-roll continuous rolling mill, which are spaced apart circumferentially along the mill stand 91. The central axis of the locking rod of one locking device 100 is vertically arranged, while the central axes of the locking rods of the other two locking devices 100 are horizontally arranged and radially symmetrical about the mill stand 91. The three locking devices are arranged in a triangular pattern along the circumferential direction of the mill stand 91, with a uniformly distributed locking force, which can stably lock the locked stand.

[0059] As described above, the locking device for a three-roll continuous rolling mill provided by the present invention has the following beneficial effects:

[0060] The locking device for a three-roll continuous rolling mill provided by the present invention decomposes the thrust of the locking power structure into a component force along the rolling centerline and an axial component force through inclined surface contact. The locking rod flexibly connects the locking power structure, reducing the impact damage caused by rigid connection and improving the service life of the locking power structure.

[0061] After the first end of the locking cylinder rod is connected to the locking connector, it forms a T-shaped structure. It is inserted into the T-shaped connector receiving groove. By adopting this "T"-shaped head connection structure, the locking hydraulic cylinder and the locking rod can achieve a flexible connection, reducing the impact of external forces on the hydraulic cylinder. It is a good measure to prevent loosening and transmit thrust, which can improve the reliability of the locking device of the three-roll continuous rolling mill.

[0062] An anti-loosening baffle is installed at the second end of the locking rod to restrict the rotation of the locking cylinder rod and to prevent the connection between the first end of the locking cylinder rod and the locking joint from loosening, thereby improving the working reliability and stability of the locking device of the three-roll continuous rolling mill.

[0063] The present invention has a simple structure, low manufacturing and installation costs, and is easy to maintain. The improved device can reduce equipment maintenance costs.

[0064] The locking device for a three-roll continuous rolling mill provided by this invention can be applied to seamless steel pipe production lines. It is suitable for three-roll continuous rolling mills that use roll changing along the rolling centerline. This invention can achieve locking of the roll stand along the rolling centerline. This invention is also suitable for other working conditions that require large stroke extension and retraction of the locking rod. A good guiding device can meet the requirements of long stroke locking.

[0065] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A locking device for a three-roll continuous rolling mill, characterized in that, It includes a locking rod that can slide through the mill stand, and a locking inclined plane is provided on the side wall of the first end of the locking rod. The locking inclined plane can slide out of the mill stand and is used to press against the inclined surface of the locked frame. The second end of the locking rod is flexibly connected to the locking power structure through a joint receiving groove and a locking joint. The connector receiving groove is provided inward from the second end of the locking rod. The second end of the locking rod is provided with a groove end opening, and the radial side of the connector receiving groove is provided with a groove side opening. The axial cross-section of the connector receiving groove is T-shaped, and the width of the groove end opening is smaller than the bottom width of the connector receiving groove. The locking connector can be inserted into the connector receiving groove through the groove side opening, and after the locking connector is inserted into the connector receiving groove, it is coaxial with the locking rod. The locking power structure includes a locking hydraulic cylinder, which includes a locking cylinder barrel and a locking cylinder rod. The first end of the locking cylinder rod is connected to the locking connector, and the second end of the locking cylinder rod slides through the locking cylinder barrel. The diameter of the first end of the locking cylinder rod is smaller than the diameter of the locking connector, and the first end of the locking cylinder rod forms a T-shaped structure after being connected to the locking connector.

2. The locking device for a three-roll continuous rolling mill as described in claim 1, characterized in that, The second end of the locking rod is connected to an anti-loosening baffle, and an anti-rotation groove is provided on the side wall of the first end of the locking cylinder rod. The anti-loosening baffle can be locked in the anti-rotation groove to prevent the locking cylinder rod from rotating relative to the locking joint.

3. The locking device for a three-roll continuous rolling mill as described in claim 1, characterized in that, The first end of the locking cylinder rod is connected to the locking joint via a thread; the locking cylinder is fixedly connected to the rolling mill stand.

4. The locking device for a three-roll continuous rolling mill as described in claim 1, characterized in that, It also includes a locking through hole provided on the rolling mill stand, and the locking power structure drives the locking rod to slide along the locking through hole through the locking joint.

5. The locking device for a three-roll continuous rolling mill as described in claim 4, characterized in that, The locking rod has an axially oriented guide groove on its side wall, and the locking through hole has an anti-rotation pin on its side wall. The guide groove can be slidably fitted onto the anti-rotation pin.

6. The locking device for a three-roll continuous rolling mill as described in claim 4, characterized in that, A guide sleeve is provided inside the locking through hole, and the locking rod can slide through the guide sleeve.

7. The locking device for a three-roll continuous rolling mill as described in claim 6, characterized in that, Two guide sleeves are provided axially spaced within the locking through hole, and a spacer ring is provided axially between the two guide sleeves.

8. The locking device for a three-roll continuous rolling mill as described in claim 1, characterized in that, The three-roll continuous rolling mill has three locking devices, which are spaced apart around the mill stand. The central axis of the locking rod of one locking device is vertical, and the central axis of the locking rod of the other two locking devices is horizontal and radially symmetrical about the mill stand.

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