Hydraulic cylinder with mechanical locking block for stabilizing rolling line of rolling mill

Abstract

The utility model relates to the technical field of workpiece clamping equipment, and provides a hydraulic cylinder with a mechanical locking block, which is used for stabilizing a rolling line of a rolling mill and comprises a hydraulic cylinder barrel and a hydraulic rod in sliding fit with the hydraulic cylinder barrel, one end of the hydraulic rod is used for contacting and pushing a jacking wedge block, and a pushed limiting block is arranged on the hydraulic rod; the linear driving assembly is arranged on the hydraulic cylinder barrel, a pushing limiting piece is arranged at the output end of the linear driving assembly, and the pushing limiting piece is configured to abut against the pushed limiting block after being driven by the linear driving assembly to move so as to limit retraction of the hydraulic rod. According to the technical scheme, the technical problem that stable operation of a rolling line cannot be guaranteed due to sliding of a locking position caused by compressibility of hydraulic oil in hydraulic locking adopted by a hydraulic cylinder matched with a wedge locking block of a rolling mill in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece clamping equipment, and specifically, to a hydraulic cylinder with a mechanical locking block for stabilizing the rolling line of a rolling mill. Background Art

[0002] During the operation of a rolling mill, the stability of the inclined wedge locking block directly determines whether the rolling line can operate stably. At present, the hydraulic cylinders supporting the inclined wedge locking blocks of rolling mills often adopt hydraulic locking methods to prevent the hydraulic cylinders from acting automatically due to the loss of pressure of hydraulic oil. However, due to the compressibility of hydraulic oil, changes in the external environment (such as temperature fluctuations and equipment vibrations) and internal pressure disturbances in the system will cause the hydraulic oil to produce small compression and rebound, resulting in the sliding of the locking position of the hydraulic cylinder. This small sliding, after accumulation, will seriously damage the stability of the rolling line and significantly reduce the product quality. For example, when rolling high-precision plates, it is easy to cause deviations in the plate thickness.

[0003] Some existing technologies adopt mechanical locking methods. Among them, the device that directly locks the cylinder rod of the hydraulic cylinder can limit the movement of the hydraulic cylinder, but it is easy to scratch the surface of the precision cylinder rod, damage the sealing performance, cause hydraulic oil leakage, reduce the working efficiency, and even cause the cylinder rod to break due to stress concentration, resulting in equipment shutdown. For the widely used mechanical locking mechanism of the conical locking block, due to the frequent action and the alternating stress it bears, it is easy to be damaged by fatigue, and faults such as failure to lock or breakage and inability to open may occur. Moreover, the spare parts maintenance requirements are high and the costs are high, increasing the production costs of enterprises. Summary of the Utility Model

[0004] To overcome the above defects, the utility model provides a hydraulic cylinder with a mechanical locking block for stabilizing the rolling line of a rolling mill, solving the technical problem in the prior art that the hydraulic locking adopted by the hydraulic cylinder supporting the inclined wedge locking block of a rolling mill has sliding of the locking position due to the compressibility of hydraulic oil, resulting in the inability to ensure the stable operation of the rolling line.

[0005] According to one aspect, at least one embodiment of the utility model provides a hydraulic cylinder with a mechanical locking block for stabilizing the rolling line of a rolling mill, which is used to push and tighten a wedging block to clamp a workpiece, and includes:

[0006] A hydraulic cylinder barrel and a hydraulic rod that slides配合 with it. One end of the hydraulic rod is used to contact and push the wedging block, and a pushed limiting block is provided on the hydraulic rod;

[0007] A linear driving component, which is arranged on the hydraulic cylinder barrel. A pushing limiting member is provided at the output end of the linear driving component. The pushing limiting member is configured to, after being moved by the linear driving component, abut against the pushed limiting block to limit the retraction of the hydraulic rod.

[0008] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, wherein the pushed limiting block is provided with a guide rod extending axially along the hydraulic rod, and the pushing limiting member slides on the guide rod.

[0009] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, wherein the linear drive assembly includes:

[0010] A scissor lift telescopic component, one end of which is mounted on the hydraulic cylinder and the other end of which is mounted on the push-limiting component. The scissor lift telescopic component is used to extend or retract to move the push-limiting component closer to or further away from the hydraulic cylinder.

[0011] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line. The pushing and limiting member has a guide groove, the extension direction of which is perpendicular to the feed direction of the scissor lift member. The moving feed end of the scissor lift member is slidably disposed within the guide groove. The linear drive assembly further includes:

[0012] A bidirectional lead screw, which is rotatably mounted on the hydraulic cylinder.

[0013] The screw nut is engaged with the bidirectional screw drive, and the moving drive end of the scissor lift member is hinged to the screw nut. The bidirectional screw is configured such that, after rotation, it drives the scissor lift member to extend and retract via the screw nut.

[0014] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, which further includes:

[0015] A rotation drive is provided on the hydraulic cylinder. The output end of the rotation drive is provided with a first gear, and a second gear is coaxially provided on the bidirectional lead screw. The first gear and the second gear mesh. The first gear is configured to rotate and then drive the bidirectional lead screw to rotate through the second gear.

[0016] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line. The guide rods are in two sets and are symmetrically arranged on the pushed limiting block. The linear drive assembly is also in two sets. The two sets of linear drive assemblies respectively drive the two pushing limiting members to slide on the guide rods, so that the two pushing limiting members push and limit the pushed limiting block synchronously after sliding. The rotation drive member is connected to the two sets of linear drive assemblies located on both sides of it through the first gear.

[0017] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, wherein the pushed limiting block and the hydraulic rod are connected by welding or bolting.

[0018] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line. The hydraulic cylinder barrel is fitted with an installation platform. The rotary drive component and the linear drive assembly are both disposed on the installation platform. The installation platform is also provided with a guide rail perpendicular to the circumference of the hydraulic cylinder barrel. The nut slides in cooperation with the guide rail.

[0019] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, wherein a sliding wheel is rotatably sleeved on the moving feed end of the scissor telescopic member, and the sliding wheel slides within the guide groove.

[0020] For example, at least one embodiment of this disclosure provides a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, wherein an installation notch is provided on the wall of the guide groove, and the sliding wheel is installed into the guide groove through the installation notch.

[0021] The beneficial effects of the embodiments of this utility model are as follows:

[0022] In this invention, when a workpiece needs to be rolled, the hydraulic cylinder is first activated. The hydraulic oil inside the cylinder pushes the hydraulic rod forward, and the front end of the hydraulic rod moves against the wedge block until it makes full contact with the workpiece and achieves stable clamping. At this time, the linear drive assembly is activated, causing it to move the push-limiting component towards the pushed-limiting block, until the two finally come into close contact. In this state, even if the hydraulic oil inside the hydraulic cylinder experiences slight compression and rebound due to changes in the external environment such as temperature fluctuations, equipment vibration, or internal system pressure disturbances, the hydraulic rod will not retract due to the contact between the push-limiting component and the pushed-limiting block, thus avoiding the instability of the rolling line caused by the slippage of the hydraulic cylinder's locking position. This solution achieves limiting through mechanical contact, avoiding the problem of slippage in the locking position caused by changes in the state of the hydraulic oil. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0024] Figure 1This is a schematic diagram of the structure of a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, according to one embodiment of the present invention.

[0025] Figure 2 for Figure 1 A partially enlarged structural diagram of section A in the middle;

[0026] Figure 3 for Figure 1 A schematic diagram of the linear drive component in the embodiment;

[0027] Figure 4 for Figure 3 A magnified schematic diagram of part B in the middle section.

[0028] In the diagram: Hydraulic cylinder-1, hydraulic rod-2, pushed limit block-3, linear drive assembly-4, push limit component-5, guide rod-301, scissor telescopic component-410, guide slide groove-501, moving feed end-411, double-acting lead screw-420, lead screw nut-430, moving drive end-412, rotating drive component-6, first gear-7, second gear-8, mounting platform-101, guide slide rail-102, sliding wheel-413, mounting notch-502. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0030] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0031] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] like Figures 1-4 As shown, this invention illustrates a hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, according to one embodiment of the present invention. In the rolling mill line stabilization system, the hydraulic cylinder with the mechanical locking block is mainly used to push the clamping wedge block, thereby achieving stable clamping of the workpiece. The specific structure of the hydraulic cylinder is as follows: its main body is a hydraulic cylinder barrel 1, with a hydraulic rod 2 slidably fitted inside. One end of the hydraulic rod 2 contacts the clamping wedge block, and when the hydraulic cylinder is working, the clamping wedge block can be pushed through this end. At the same time, a pushed limiting block 3 is installed on the hydraulic rod 2, which cooperates with the subsequent pushing limiting component 5 to limit the hydraulic rod 2. A linear drive assembly 4 is installed on the hydraulic cylinder barrel 1, and its output end is provided with a pushing limiting component 5. When the linear drive assembly 4 is working, it drives the pushing limiting component 5 to move, so that it abuts against the pushed limiting block 3. This abutting state can limit the retraction of the hydraulic rod 2, thereby ensuring the stability of the entire system.

[0036] The working process of the hydraulic cylinder with mechanical locking block is as follows: When a workpiece needs to be rolled, the hydraulic cylinder is first activated. The hydraulic oil in the cylinder barrel 1 pushes the hydraulic rod 2 forward, and the front end of the hydraulic rod 2 moves against the wedge block until it makes full contact with the workpiece and achieves stable clamping of the workpiece. At this time, the linear drive assembly 4 is activated, which drives the push-limiting component 5 to move towards the pushed-limiting block 3, and finally the two are tightly abutted. In this state, even if the hydraulic oil inside the hydraulic cylinder experiences slight compression and rebound due to changes in the external environment such as temperature fluctuations, equipment vibration, or internal system pressure disturbances, the hydraulic rod 2 will not retract due to the abutting action of the push-limiting component 5 and the pushed-limiting block 3, thus avoiding the instability of the rolling line caused by the slippage of the hydraulic cylinder locking position. This solution achieves limiting through mechanical abutment, avoiding the problem of slippage of the locking position caused by changes in the state of the hydraulic oil.

[0037] In some examples, a guide rod 301 extending axially along the hydraulic rod 2 is provided on the pushed limiting block 3, and the pushing limiting member 5 can slide on the guide rod 301. This structural design allows the pushing limiting member 5 to slide precisely along the axial direction of the guide rod 301 during movement, avoiding deviation or wobbling of the pushing limiting member 5 during movement, thereby further improving its stability and accuracy when it abuts against the pushed limiting block 3.

[0038] In some examples, the linear drive assembly 4 employs a scissor lift telescopic member 410, designed to drive the push-limit member 5 precisely along the guide rod 301 through its telescopic movement, thereby achieving reliable locking and releasing of the hydraulic rod 2. One end of the scissor lift telescopic member 410 is hinged to the hydraulic cylinder 1, and the other end is hinged to the push-limit member 5, forming a telescopic linkage structure. When the scissor lift telescopic member 410 extends, the push-limit member 5 moves along the guide rod 301 toward the pushed-limit block 3 until it abuts, restricting the retraction of the hydraulic rod 2; when the scissor lift telescopic member 410 retracts, the push-limit member 5 moves away from the pushed-limit block 3, releasing the lock on the hydraulic rod 2. The multi-hinged design of the scissor structure maintains high rigidity and stability during telescopic movement, effectively preventing the push-limit member 5 from swaying or shifting, ensuring stable contact with the pushed-limit block 3. Simultaneously, the scissor lift telescopic member 410 occupies little space in the retracted state, making it suitable for installation in space-constrained equipment such as rolling mills, while also providing a large stroke range.

[0039] In some examples, the specific structure of the linear drive assembly 4 is further refined into a combination of a bidirectional lead screw 420, a lead screw nut 430 transmission system, and a scissor lift telescopic member 410. The bidirectional lead screw 420 is rotatably mounted on the hydraulic cylinder 1, and the lead screw nut 430 is threadedly engaged with the bidirectional lead screw 420. The moving drive end 412 of the scissor lift telescopic member 410 is hinged to the lead screw nut 430, and the moving feed end 411 is slidably connected to the push limit member 5 through the guide groove 501. When the bidirectional lead screw 420 rotates, the lead screw nut 430 moves along the axial direction of the bidirectional lead screw, driving the scissor lift telescopic member 410 to extend or retract, thereby causing the push limit member 5 to move linearly along the guide rod 301.

[0040] The specific workflow is as follows: When the bidirectional lead screw 420 rotates clockwise, the lead nut 430 moves away from the hydraulic cylinder 1, the scissor lift extension member 410 extends, and its moving feed end 411 slides in the guide groove 501 and pushes the push limit member 5 along the guide rod 301 towards the pushed limit block 3 until mechanical locking is achieved; conversely, when the bidirectional lead screw 420 rotates counterclockwise, the lead nut 430 moves in the opposite direction, the scissor lift extension member 410 retracts, the push limit member 5 retracts, and the lock is released. The bidirectional lead screw drive has high transmission accuracy and positioning accuracy, enabling precise position control of the push limit member 5 and ensuring reliable contact with the pushed limit block 3. The structural characteristics of the scissor lift extension member 410 amplify the driving force of the bidirectional lead screw 420, enabling the push limit member 5 to generate a greater locking force, effectively resisting vibration and impact during the rolling process. Meanwhile, preferred designs can be made to have self-locking characteristics by selecting small lead angles such as single-start threads, small pitch threads, and trapezoidal threads, combined with lubrication that controls the coefficient of friction. This forms a double locking mechanism with the hydraulic drive, thereby improving the stability of the rolling mill line.

[0041] In some examples, a rotary drive is introduced to achieve efficient driving of the bidirectional lead screw 420, and power transmission is achieved through the meshing of the first gear 7 and the second gear 8. The rotary drive is fixedly mounted on the hydraulic cylinder 1, and its output shaft is keyed to the first gear 7. The second gear 8 is coaxially mounted on the end of the bidirectional lead screw 420 through a flat key or interference fit. When the rotary drive is activated, the output shaft drives the first gear 7 to rotate. The meshing of the first gear 7 and the second gear 8 causes the second gear 8 to rotate accordingly, thereby driving the bidirectional lead screw 420 to rotate. Through the lead screw nut 430, the scissor fork extension member 410 extends and retracts, ultimately realizing the movement of the push limit member 5 and the locking and releasing of the hydraulic rod 2. The gear transmission structure is compact and occupies little space, making it suitable for installation in space-constrained equipment such as rolling mills, while meeting the system's requirements for power transmission and motion control.

[0042] In some examples, two sets of guide rods 301 are symmetrically arranged on the pushed limit block 3, and two sets of linear drive components 4 are also provided. Each set of linear drive components 4 drives a push limit member 5 to slide on the corresponding guide rod 301, thereby realizing that the two push limit members 5 push and limit the pushed limit block 3 synchronously. The first gear 7 rotates, which simultaneously drives the second gears 8 on both sides to rotate. One of the second gears 8 is provided with an intermediate gear in front to keep the two second gears 8 rotating in the same direction, thereby making the two sets of bidirectional lead screws 420 rotate synchronously. The rotation of the bidirectional lead screws 420 drives the scissor telescopic member 410 to extend and retract through the lead screw nut 430, so that the two push limit members 5 move synchronously along the guide rod 301 toward the pushed limit block 3 until they abut against the pushed limit block 3, realizing reliable locking of the hydraulic rod 2. Through the synchronous action of the two sets of linear drive components 4 and push limit members 5, the locking force can be applied more evenly, effectively avoiding the displacement or shaking of the hydraulic rod 2 caused by uneven force on one side, and improving the locking stability of the entire system.

[0043] In some examples, the connection between the pushed limiting block 3 and the hydraulic rod 2 is achieved by welding or bolting. Welding provides higher connection strength, ensuring that the pushed limiting block 3 and the hydraulic rod 2 will not loosen or separate under excessive force during mill operation, thus guaranteeing the stability of the entire mechanical locking structure. Bolted connections are relatively simple to install and disassemble, requiring no special tools or complex processes, and facilitate the replacement or adjustment of the pushed limiting block 3 during equipment maintenance and repair.

[0044] In some examples, the mounting platform 101 fitted onto the hydraulic cylinder 1 is a plate-like structure, with its surface perpendicular to the axis of the hydraulic cylinder 1. It is connected to the outer wall of the hydraulic cylinder 1 by bolts or welding. The upper surface of the plate-like mounting platform 101 forms a planar mounting area, and the rotary drive component and the linear drive assembly 4 are both fixed to this plane by bolts, ensuring the uniformity of the mounting reference and the rigidity of the structure. The bottom of the nut 430 is machined with a groove that matches the guide rail 102. The inner wall of the groove is clearance-fitted with the side of the rail, so that when the bidirectional lead screw 420 rotates, the nut 430 can only slide linearly along the direction of the guide rail 102 and cannot rotate with the bidirectional lead screw 420. The plate-like structure provides a large-area planar mounting base, enhancing the installation stability of the rotary drive component and the linear drive assembly 4, and reducing the impact of equipment vibration on the transmission system; the sliding engagement between the guide rail 102 and the screw nut 430 limits the motion error of the screw nut 430 to the guide direction of the rail, avoiding transmission jamming caused by the circumferential component force generated by the rotation of the bidirectional screw 420, and ensuring that the extension and retraction of the scissor lift telescopic component 410 is uniform and smooth.

[0045] In some examples, to optimize the sliding fit between the scissor lift telescopic component 410 and the guide groove 501, a sliding wheel 413 is rotatably sleeved on the moving feed end 411 of the scissor lift telescopic component 410. The sliding wheel 413 is rotatably connected to the moving feed end 411 through a bearing or bushing, and its outer circumferential surface rolls within the guide groove 501. When the bidirectional lead screw 420 rotates to drive the lead nut 430 to move linearly, the telescopic movement of the scissor lift telescopic component 410 is converted into the linear movement of the push-limiting component 5 through the rolling of the sliding wheel 413 within the guide groove 501, thereby locking or releasing the hydraulic rod 2. The rolling motion of the sliding wheel 413 can effectively absorb and buffer the vibration and impact generated by the scissor lift telescopic component 410 during telescopic movement, making the movement of the push-limiting component 5 smoother. This is particularly important for rolling mill lines that require high-precision positioning, and helps to improve the quality of rolled products.

[0046] In some examples, to solve the assembly problem between the sliding wheel 413 and the guide groove 501, an installation notch 502 is made on the groove wall of the guide groove 501. The width of the installation notch 502 is greater than the outer diameter of the sliding wheel 413, and its position corresponds to the initial assembly position of the scissor lift extension member 410, so that the sliding wheel 413 can be laterally inserted into the guide groove 501 through the notch.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line, used to push a clamping wedge to hold a workpiece, characterized in that, include: A hydraulic cylinder (1) and a hydraulic rod (2) that slides with it, one end of the hydraulic rod (2) is used to contact the push-tightening wedge block, and the hydraulic rod (2) is provided with a push-limiting block (3). A linear drive assembly (4) is disposed on the hydraulic cylinder (1). A push limiter (5) is provided on the output end of the linear drive assembly (4). The push limiter (5) is configured such that after being driven to move by the linear drive assembly (4), the push limiter (5) abuts against the pushed limiter block (3) to limit the retraction of the hydraulic rod (2).

2. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 1, characterized in that, The pushed limiting block (3) is provided with a guide rod (301) extending axially along the hydraulic rod (2), and the pushing limiting member (5) slides on the guide rod (301).

3. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 2, characterized in that, The linear drive component (4) includes: The scissor lift telescopic component (410) has one end mounted on the hydraulic cylinder (1) and the other end mounted on the push-limiting component (5). The scissor lift telescopic component (410) is used to extend and retract to drive the push-limiting component (5) to move closer to or further away from the hydraulic cylinder (1).

4. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 3, characterized in that, The push-limiting member (5) is provided with a guide groove (501), the extension direction of the guide groove (501) is perpendicular to the feed direction of the scissor telescopic member (410), the moving feed end (411) of the scissor telescopic member (410) is slidably disposed in the guide groove (501), and the linear drive assembly (4) further includes: A two-way lead screw (420) is rotatably mounted on the hydraulic cylinder (1); The two screw nuts (430) are respectively engaged with the two opposite threaded sections of the bidirectional screw (420). The two moving drive ends (412) of the scissor telescopic member (410) are respectively hinged to the two screw nuts (430). The bidirectional screw (420) is configured such that after rotation, it drives the scissor telescopic member (410) to extend and retract through the screw nuts (430).

5. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 4, characterized in that, Also includes: A rotation drive is provided on the hydraulic cylinder (1). The output end of the rotation drive is provided with a first gear (7), and a second gear (8) is coaxially provided on the bidirectional lead screw (420). The first gear (7) and the second gear (8) mesh. The first gear (7) is configured to drive the bidirectional lead screw (420) to rotate through the second gear (8) after rotation.

6. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 5, characterized in that, The guide rod (301) consists of two sets, which are symmetrically arranged on the pushed limiting block (3). The linear drive assembly (4) also consists of two sets. The two sets of linear drive assemblies (4) drive the two pushing limiting members (5) to slide on the guide rod (301) respectively, so that the two pushing limiting members (5) push and limit the pushed limiting block (3) synchronously after sliding. The rotation drive member is connected to the two sets of linear drive assemblies (4) located on both sides of it through the first gear (7).

7. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 1, characterized in that, The pushed limiting block (3) and the hydraulic rod (2) are connected by welding or bolts.

8. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 5, characterized in that, The hydraulic cylinder (1) is fitted with an installation platform (101), the rotary drive component and the linear drive assembly (4) are both mounted on the installation platform (101), and the installation platform (101) is also provided with a guide rail (102) perpendicular to the circumference of the hydraulic cylinder (1), and the nut (430) slides in cooperation with the guide rail (102).

9. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 4, characterized in that, A sliding wheel (413) is rotatably mounted on the moving feed end (411) of the scissor telescopic member (410), and the sliding wheel (413) slides in the guide groove (501).

10. A hydraulic cylinder with a mechanical locking block for stabilizing a rolling mill line according to claim 9, characterized in that, The guide groove (501) has an installation notch (502) on its groove wall, and the sliding wheel (413) is installed into the guide groove (501) through the installation notch (502).

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