A hydraulic cylinder with self-locking function for use in steel mills

Abstract

The present invention relates to the technical field of hydraulic cylinders, and in particular to a hydraulic cylinder with a self-locking function for use in a steel mill. When a movable rod is extended to a maximum value, the movable rod can be locked on a cylinder body by a fixed block. In the final stage of the extension operation, the fixed block can also cooperate with a rubber pad to buffer and decelerate the piston to avoid the movable rod and parts thereon from stopping at a high speed, thereby reducing structural damage. At the same time, by providing a groove two on the rubber pad, the rubber pad is sucked tightly on the inner wall of the cylinder body to increase the resistance of the rubber pad when sliding on the inner wall of the cylinder body, thereby improving the buffering and deceleration effect on the piston. A hydraulic cylinder with a self-locking function for use in a steel mill comprises a movable block one, a connecting rod, a piston, a fixed block one, a spring one, a linkage block, a rubber pad and a locking assembly; a movable block one is fixedly connected to the movable rod, and the movable block one is slidably connected to the cylinder body; a connecting rod is slidably connected to the movable block one, and a piston is fixedly connected to the connecting rod, and the piston is slidably connected to the cylinder body.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic cylinders, and more specifically, to a hydraulic cylinder with a self-locking function for use in a steel mill. Background Art

[0002] During the production and processing of steel plants, a large number of hydraulic presses are needed to lift materials such as steel products and steel raw materials. The existing hydraulic cylinder is provided with a self-locking structure. When the hydraulic cylinder lifts the material to a preset position, the telescopic rod on the hydraulic cylinder is locked by the self-locking structure to prevent the telescopic rod from sliding down, so as to improve the stability of the hydraulic rod's support for the material. However, the self-locking structure of the existing hydraulic cylinder only has a self-locking function, and the function is relatively single. Summary of the invention

[0003] In order to overcome the disadvantage that the self-locking structure of the existing hydraulic cylinder only has a self-locking function and a relatively single function, the present invention provides a hydraulic cylinder with a self-locking function for use in a steel plant.

[0004] The technical implementation scheme of the present invention is:

[0005] A hydraulic cylinder with a self-locking function for use in a steel plant comprises a cylinder body, a cylinder cover and a movable rod; the cylinder body is fixedly connected with the cylinder cover; the cylinder body is slidably connected with the movable rod; it also comprises a movable block 1, a connecting rod, a piston, a fixed block 1, a spring 1, a linkage block, a rubber pad and a locking assembly; the movable rod is fixedly connected with a movable block 1, and the movable block 1 is slidably connected with the cylinder body; the movable block 1 is slidably connected with a connecting rod, and the connecting rod is fixedly connected with a piston, and the piston is slidably connected with the cylinder body; a plurality of fixed blocks 1 are slidably connected with the movable block 1; each fixed block 1 is fixedly connected with a spring 1, and the spring 1 is fixedly connected with the movable block 1; the piston is fixedly connected with a linkage block, and the linkage block contacts with the connecting rod; the fixed block 1 cooperates with the linkage block; each fixed block 1 is fixedly connected with a rubber pad; a through hole 1 is commonly provided between the cylinder body and the cylinder cover; a through hole 2 is provided on the cylinder body; a plurality of through grooves are provided on the movable block 1; a plurality of grooves 1 are provided on the cylinder body; a locking assembly is connected to the movable block 1; the locking assembly is used to lock the fixed block 1.

[0006] As a further preferred solution, the locking assembly includes a fixed block 2 and a spring 2; a plurality of fixed blocks 2 are slidably connected to the movable block 1, the fixed block 2 is in contact with the cylinder body, and the fixed block 2 is in contact with the corresponding fixed block 1; an avoidance groove is provided on each fixed block 1; a spring 2 is fixedly connected to each fixed block 2, and the spring 2 is fixedly connected to the movable block 1.

[0007] As a further preferred solution, a plurality of grooves 2 are provided on the rubber pad.

[0008] As a further preferred solution, the side surface of the rubber pad close to the movable block 1 is arranged as an inclined surface.

[0009] As a further preferred embodiment, it also includes a movable block 2; a plurality of movable blocks 2 are slidably connected to the movable block 1, and a chamber 1 is formed between the movable block 2 and the movable block 1; a plurality of channels 1 are opened on the movable block 1, and the channels 1 are connected to the corresponding chambers 1; a chamber 2 is formed between each fixed block 1 and the movable block 1, and the chamber 2 is connected to the corresponding channel 1.

[0010] As a further preferred solution, an inclined surface is provided on the movable block 2.

[0011] As a further preferred solution, a protrusion is provided on the movable block 2, a sliding groove is provided on the movable block 1, and the movable block 1 is located outside the corresponding protrusion.

[0012] As a further preferred solution, a plurality of channels 2 are provided on the cylinder body, and the channels 2 are connected to the corresponding grooves 1.

[0013] As a further preferred solution, both the fixed block 1 and the linkage block are made of wear-resistant materials.

[0014] As a further preferred solution, the outer surface of the cylinder body is coated with anti-corrosion paint.

[0015] The present invention has the following advantages:

[0016] 1. When the movable rod is extended to the maximum value, the movable rod can be locked on the cylinder body by the fixing block 1. In the final stage of the extension operation, the fixing block 1 can also cooperate with the rubber pad to buffer and decelerate the piston to prevent the movable rod and the parts thereon from stopping at a high speed, thereby reducing structural damage. At the same time, by providing a groove 2 on the rubber pad, the rubber pad is tightly sucked on the inner wall of the cylinder body to increase the resistance of the rubber pad when sliding on the inner wall of the cylinder body, thereby improving the buffering and deceleration effect on the piston;

[0017] Second, the movable block 2 is pushed to move by the hydraulic oil, so that the movable block 2 pressurizes the pressure oil in the chamber 2, thereby pushing the fixed block 1 to move away from the groove 1 through the pressure oil, and assisting the fixed block 1 to perform the unlocking operation. At the same time, when the hydraulic oil flows through the inclined surface of the movable block 2, it can apply a thrust to the movable block 2 toward the center of the movable block 1, providing a starting force for the movement of the movable block 2, which is beneficial to improving the sensitivity of the movable block 2 when starting, and is beneficial to improving the unlocking speed of the fixed block 1;

[0018] 3. Part of the hydraulic oil is delivered to the groove one through the channel two, and then the fixed block one is pushed to move away from the groove one, and the fixed block one is unlocked together with the spring one and the pressure oil in the chamber two, thereby greatly improving the unlocking efficiency of the fixed block one and avoiding the problem of unlocking failure of the fixed block one caused by the excessive movement of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structural schematic diagram of the hydraulic cylinder with self-locking function used in steel mills of the present invention is shown;

[0020] Figure 2 The schematic diagram of the structure of the inner side of the cylinder body of the present invention is shown;

[0021] Figure 3 The schematic diagram of the structure of the groove 1 and the channel 2 of the present invention is shown;

[0022] Figure 4 A schematic diagram showing the installation position of the locking assembly of the present invention is shown;

[0023] Figure 5 A schematic structural diagram of the locking assembly of the present invention is shown;

[0024] Figure 6 The structural schematic diagram of the rubber pad of the present invention is shown;

[0025] Figure 7 The schematic diagram of the structure of chamber 1, channel 1 and chamber 2 of the present invention is shown.

[0026] Among them: 1-cylinder body, 2-cylinder cover, 3-movable rod, 4-movable block one, 5-connecting rod, 6-piston, 7-fixed block one, 8-spring one, 9-linkage block, 10-rubber pad, 11-fixed block two, 12-spring two, 13-movable block two, 71-avoidance groove, 91-through hole one, 92-through hole two, 93-through groove, 94-groove one, 95-groove two, 96-chamber one, 97-channel one, 98-chamber two, 99-channel two. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] A hydraulic cylinder with self-locking function for use in steel mills, such as Figure 1-Figure 6As shown, it includes a cylinder body 1, a cylinder cover 2 and a movable rod 3; the cylinder body 1 is bolted with a cylinder cover 2, and the cylinder cover 2 is set to be made of alloy; the cylinder body 1 is slidably connected with a movable rod 3; it also includes a movable block 4, a connecting rod 5, a piston 6, a fixed block 7, a spring 8, a linkage block 9, a rubber pad 10 and a locking assembly; the movable rod 3 is bolted with a movable block 4, the movable block 4 is slidably connected to the cylinder body 1, and the movable block 4 is set to be made of alloy; the movable block 4 is slidably connected with a connecting rod 5, the connecting rod 5 is fixedly connected with a piston 6, and the piston 6 is slidably connected to the cylinder body 1; the movable block 4 is slidably connected with two fixed blocks 7, and the fixed blocks 7 are set to be made of alloy; each fixed block 7 is fixedly connected with a spring 8 , spring 18 is fixedly connected to movable block 14; linkage block 9 is bolted to piston 6, linkage block 9 is in contact with connecting rod 5; fixed block 17 cooperates with linkage block 9; each fixed block 7 is fixedly connected to a rubber pad 10; a through hole 191 is provided between cylinder body 1 and cylinder cover 2; through hole 292 is provided on cylinder body 1, hydraulic oil flows into the left cavity of piston 6 from through hole 292, and then pushes piston 6 to move rightward through hydraulic oil, piston 6 drives connecting rod 5 to move rightward, connecting rod 5 pulls movable block 14 to move rightward, and movable block 4 drives movable rod 3 to move rightward; two through grooves 93 are provided on movable block 4; two grooves 94 are provided on cylinder body 1; a locking assembly is connected to movable block 4.

[0030] The locking assembly includes a fixed block 11 and a spring 12; two fixed blocks 11 are slidably connected to the movable block 4, the fixed block 11 is in contact with the cylinder body 1, and the fixed block 11 is in contact with the corresponding fixed block 7; each fixed block 7 is provided with an avoidance groove 71; each fixed block 11 is fixedly connected to a spring 12, and the spring 12 is fixedly connected to the movable block 4.

[0031] The rubber pad 10 is provided with a plurality of grooves 95 .

[0032] The side surface of the rubber pad 10 close to the movable block 4 is set as an inclined surface for guiding the fixed block 7.

[0033] First, two external pipes are manually connected to through hole 1 91 and through hole 2 92 respectively. When an extension operation is required, the external pipe delivers hydraulic oil to through hole 1 91, and the hydraulic oil flows into the cavity on the right side of piston 6 through through hole 1 91. Then, piston 6 is pushed to the left by the hydraulic oil, and piston 6 drives linkage block 9 to move to the left. Linkage block 9 applies a leftward thrust to fixed block 1 7, while fixed block 1 7 is blocked by fixed block 2 11 and cannot move upward, so that linkage block 9 pushes fixed block 1 7 to move to the left, fixed block 1 7 pushes movable block 1 4 to move to the left, and movable block 1 4 drives movable rod 3 to move to the left, and the left part of movable rod 3 is pushed out of cylinder body 1 to complete the extension operation.

[0034] During the extension operation, the movable block 4 drives the parts thereon to move to the left together. In the final stage of the extension operation, the left side of the fixed block 11 contacts the cylinder body 1, and the movable block 4 drives the fixed block 7 to continue to move to the left, while the fixed block 11 is blocked by the cylinder body 1 and remains stationary, so that the avoidance groove 71 on the fixed block 7 is aligned with the raised portion at the right end of the fixed block 11, and the spring 12 is compressed. At this time, the fixed block 11 stops blocking and limiting the fixed block 7, and the piston 6 drives the linkage block 9 to move to the left, so that the linkage block 9 pushes the fixed block 7 to move away from the center line of the movable block 4, and stretches the spring 8, so that the fixed block 11 is The fixed block 7 squeezes the rubber pad 10 on the inner wall of the cylinder body 1, and the piston 6 continues to move to the left, causing the rubber pad 10 to slide to the left in a damping manner on the inner wall of the cylinder body 1, thereby buffering and decelerating the piston 6 until the left side of the movable block 4 contacts the cylinder body 1. At this time, the movable rod 3 has been extended to the limit position, and the fixed block 7 is just aligned with the groove 94. The piston 6 drives the linkage block 9 to continue to move to the left, so that the linkage block 9 pushes the fixed block 7 to move toward the corresponding groove 94, thereby inserting the fixed block 7 into the groove 94. At this time, the movable block 4 is locked on the cylinder body 1 through the fixed block 7, thereby locking the movable rod 3 on the cylinder body 1, completing the self-locking operation.

[0035] When shortening operation is required, the external pipeline connected with through hole 1 91 starts to release pressure, and the external pipeline connected with through hole 2 92 delivers hydraulic oil to through hole 2 92, and the hydraulic oil flows into the inner side of cylinder body 1 through through hole 2 92, and then flows into the left cavity of piston 6 through transparent groove 93, and then the piston 6 is pushed to move rightward by the hydraulic oil, and piston 6 drives linkage block 9 to move rightward, so that spring 18 rebounds and drives fixed block 17 to move toward the center line of movable block 14, and then the fixed block 17 is moved away from groove 194, completing the unlocking operation. During the unlocking process, piston 6 also The connecting rod 5 will be driven to move rightward. After the connecting rod 5 slides to the rightward to the limit position in the movable block 4, the movable block 4 is pulled to move rightward by the connecting rod 5. The movable block 4 drives the fixed block 2 11 and the spring 2 12 to move rightward. After the fixed block 2 11 stops contacting the cylinder body 1, the spring 2 12 drives the fixed block 2 11 to move back to its original position, so that the raised part at the right end of the fixed block 2 11 contacts the fixed block 7 again, so that the fixed block 2 11 locks the fixed block 7 again, and the movable block 4 drives the movable rod 3 to move rightward, and the right part of the movable rod 3 is received in the cylinder body 1, completing the shortening operation.

[0036] When the fixing block 1 7 squeezes the rubber pad 10 onto the inner wall of the cylinder body 1 , the hydraulic oil in the groove 2 95 can be squeezed out, thereby sucking the rubber pad 10 onto the inner wall of the cylinder body 1 , which is beneficial to increase the resistance of the rubber pad 10 when sliding on the inner wall of the cylinder body 1 , thereby improving the buffering and deceleration effect on the piston 6 .

[0037] During use, when the movable rod 3 is extended to the maximum value, the movable rod 3 can be locked on the cylinder body 1 by the fixing block 17. In the final stage of the extension operation, the fixing block 17 can also cooperate with the rubber pad 10 to buffer and decelerate the piston 6 to prevent the movable rod 3 and the parts thereon from stopping at a high speed, thereby reducing structural damage. At the same time, by providing a groove 295 on the rubber pad 10, the rubber pad 10 is sucked tightly on the inner wall of the cylinder body 1 to increase the resistance of the rubber pad 10 when sliding on the inner wall of the cylinder body 1, thereby improving the buffering and deceleration effect on the piston 6.

[0038] Example 2

[0039] On the basis of Example 1, Figure 7 As shown, it also includes a movable block 13; two movable blocks 13 are slidably connected to the movable block 14, and a chamber 96 is formed between the movable block 13 and the movable block 4; two channels 97 are opened on the movable block 4, and the channels 97 are connected to the corresponding chambers 96; a chamber 98 is formed between each fixed block 7 and the movable block 4, and the chamber 98 is connected to the corresponding channel 97.

[0040] The movable block 13 is provided with an inclined surface. When the hydraulic oil flows through the transparent groove 93 , it will impact the inclined surface of the movable block 13 , thereby pushing the movable block 13 toward the inside of the chamber 1 96 .

[0041] The movable block 2 13 is provided with a protrusion, the movable block 1 4 is provided with a slide groove, and the movable block 1 4 is located outside the corresponding protrusion to prevent falling off.

[0042] During the shortening operation, during the unlocking stage of the fixed block 7, if the piston 6 moves to the right too quickly, before the spring 8 has taken the fixed block 7 away from the groove 94, the piston 6 will pull the movable block 4 to move to the right through the connecting rod 5, so that the movable block 4 applies a rightward thrust to the fixed block 7, pressing the fixed block 7 against the side wall of the groove 94, so that the spring 8 cannot take the fixed block 7 away from the groove 94, resulting in the problem of unlocking failure. Therefore, during the shortening operation, the external pipe connected to the through hole 2 92 is pushed toward the through hole 2 92 transports hydraulic oil, which flows into the inner side of the cylinder body 1 through the through hole 92, and then flows into the left cavity of the piston 6 through the transparent groove 93, so that the hydraulic oil pressure in the left cavity of the piston 6 increases, thereby pushing the movable block 13 to move through the hydraulic oil, and the movable block 13 squeezes the pressure oil originally sealed in the chamber 1 96, so that the pressure oil in the chamber 1 96 flows into the chamber 2 98 through the channel 1 97, and then pushes the fixed block 7 to move away from the groove 1 94, assisting the fixed block 7 to perform the unlocking operation.

[0043] When the hydraulic oil flows through the transparent groove 93 into the left cavity of the piston 6, the hydraulic oil flows through the inclined surface of the movable block 13, thereby applying a thrust to the movable block 13 toward the center of the movable block 14, providing a starting force for the movement of the movable block 13, which is beneficial to improving the sensitivity of the movable block 13 when starting, and is beneficial to improving the unlocking speed of the fixed block 7.

[0044] When in use, hydraulic oil is used to push the movable block 13 to move, so that the movable block 13 pressurizes the pressure oil in the chamber 98, thereby pushing the fixed block 7 to move away from the groove 94 through the pressure oil, and assisting the fixed block 7 to perform the unlocking operation. At the same time, when the hydraulic oil flows through the inclined surface of the movable block 13, it can apply a thrust to the movable block 13 toward the center of the movable block 4, providing a starting force for the movement of the movable block 13, which is beneficial to improve the sensitivity of the movable block 13 when starting, and is beneficial to improve the unlocking speed of the fixed block 7.

[0045] Example 3

[0046] On the basis of Example 2, Figure 3 As shown, two channels 99 are provided on the cylinder body 1 , and the channels 99 are connected to the corresponding grooves 94 , and the hydraulic oil flows from the channels 99 into the grooves 94 .

[0047] The fixed block 7 and the linkage block 9 are both made of wear-resistant materials to increase their service life.

[0048] The outer surface of the cylinder body 1 is coated with anti-corrosion paint to prevent rust.

[0049] During the shortening operation, in the unlocking stage of the fixed block 7, the external pipe connected to the through hole 2 92 transports hydraulic oil to the through hole 2 92, and the hydraulic oil flows into the inner side of the cylinder body 1 through the through hole 2 92, and part of the hydraulic oil flows into the groove 1 94 through the channel 2 99, and then pushes the fixed block 7 to move away from the groove 1 94, and cooperates with the spring 1 8 and the pressure oil in the chamber 2 98 to unlock the fixed block 7, thereby greatly improving the unlocking efficiency of the fixed block 7 and avoiding the problem of failure of unlocking the fixed block 7 due to the excessively fast movement of the piston 6.

[0050] Although the present disclosure has been shown and described with reference to specific exemplary embodiments of the present disclosure, it should be understood by those skilled in the art that various changes in form and details may be made to the present disclosure without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. Therefore, the scope of the present disclosure should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A hydraulic cylinder with a self-locking function for use in a steel mill, comprising a cylinder body (1); a cylinder cover (2) fixedly connected to the cylinder body (1); and a movable rod (3) slidably connected to the cylinder body (1); wherein: A movable block (4) is fixedly connected to the movable rod (3), and the movable block (4) is slidably connected to the cylinder body (1); a connecting rod (5) is slidably connected to the movable block (4), and a piston (6) is fixedly connected to the connecting rod (5), and the piston (6) is slidably connected to the cylinder body (1); a plurality of fixed blocks (7) are slidably connected to the movable block (4); each fixed block (7) is fixedly connected to a spring (8), and the spring (8) is fixedly connected to the movable block (4); a linkage block (9) is fixedly connected to the piston (6), and the linkage block ( 9) contacts the connecting rod (5); the fixed block (7) cooperates with the linkage block (9); each fixed block (7) is fixedly connected to a rubber pad (10); a through hole (91) is provided between the cylinder body (1) and the cylinder cover (2); a through hole (92) is provided on the cylinder body (1); a plurality of through grooves (93) are provided on the movable block (4); a plurality of grooves (94) are provided on the cylinder body (1); a locking assembly is connected to the movable block (4); the locking assembly is used to lock the fixed block (7); The locking assembly comprises a fixed block 2 (11); a plurality of fixed blocks 2 (11) are slidably connected to the movable block 1 (4), the fixed block 2 (11) contacts the cylinder body (1), and the fixed block 2 (11) contacts the corresponding fixed block 1 (7); each fixed block 1 (7) is provided with an avoidance groove (71); each fixed block 2 (11) is fixedly connected to a spring 2 (12), and the spring 2 (12) is fixedly connected to the movable block 1 (4); The rubber pad (10) is provided with a plurality of grooves 2 (95); The side surface of the rubber pad (10) close to the movable block 1 (4) is arranged as an inclined surface; When the extension operation is performed, hydraulic oil is supplied to the through hole 1 (91), and the hydraulic oil pushes the piston (6) to move to the left. At this time, the fixed block 1 (7) is blocked by the fixed block 2 (11) and cannot move upward. The piston (6) drives the linkage block (9), the fixed block 1 (7), the movable block 1 (4) and the movable rod (3) to move to the left. In the final stage of the extension operation, the left side of the fixed block 2 (11) contacts the cylinder body (1) and is prevented from moving. The movable block 1 (4) drives the fixed block 1 (7) to move to the left. Continue to move leftward, so that the avoidance groove (71) on the fixed block (7) is aligned with the raised portion at the right end of the fixed block (11), and the fixed block (11) stops blocking the fixed block (7); when the fixed block (7) is just aligned with the groove (94), the piston (6) drives the linkage block (9) to continue to move leftward, so that the linkage block (9) pushes the fixed block (7) to move toward the corresponding groove (94), and the fixed block (7) is inserted into the groove (94), completing the self-locking operation; When the shortening operation is performed, hydraulic oil is delivered to the second through hole (92), and the hydraulic oil flows through the transparent groove (93) into the left cavity of the piston (6), pushing the piston (6) to move rightward, and the piston (6) drives the linkage block (9) to move rightward. The spring (8) rebounds and drives the fixed block (7) to move toward the center line of the movable block (4), so that the fixed block (7) moves away from the groove (94), completing the unlocking operation; In the above process, the fixed block 1 (7) presses the rubber pad (10) against the inner wall of the cylinder body (1), thereby increasing the resistance of the rubber pad (10) when sliding on the inner wall of the cylinder body (1), and buffering and decelerating the piston (6).

2. A hydraulic cylinder with self-locking function for use in a steel mill according to claim 1, characterized in that: It also includes a movable block 2 (13); a plurality of movable blocks 2 (13) are slidably connected to the movable block 1 (4); a chamber 1 (96) is formed between the movable block 2 (13) and the movable block 1 (4); a plurality of channels 1 (97) are opened on the movable block 1 (4), and the channels 1 (97) are connected to the corresponding chambers 1 (96); a chamber 2 (98) is formed between each fixed block 1 (7) and the movable block 1 (4), and the chamber 2 (98) is connected to the corresponding channel 1 (97); When the hydraulic oil flows through the transparent groove (93), the movable block (13) is pushed toward the inside of the chamber (96), squeezing the pressure oil in the chamber (96), causing the pressure oil in the chamber (96) to flow into the chamber (98) through the channel (97), and then pushing the fixed block (7) to move in a direction away from the groove (94), thereby assisting the fixed block (7) in performing the unlocking operation.

3. A hydraulic cylinder with self-locking function for use in a steel mill according to claim 2, characterized in that: The movable block 2 (13) is provided with an inclined surface.

4. A hydraulic cylinder with self-locking function for use in a steel mill according to claim 3, characterized in that: The movable block 2 (13) is provided with a protrusion, the movable block 1 (4) is provided with a sliding groove, and the movable block 1 (4) is located outside the corresponding protrusion.

5. A hydraulic cylinder with self-locking function for use in a steel mill according to claim 4, characterized in that: The cylinder body (1) is provided with a plurality of second channels (99), and the second channels (99) are connected to the corresponding first grooves (94); During the unlocking stage of the fixed block 1 (7), hydraulic oil is delivered to the through hole 2 (92), and the hydraulic oil flows into the inner side of the cylinder body (1) through the through hole 2 (92). Part of the hydraulic oil flows into the groove 1 (94) through the channel 2 (99), and then pushes the fixed block 1 (7) to move away from the groove 1 (94), and cooperates with the spring 1 (8) and the pressure oil in the chamber 2 (98) to unlock the fixed block 1 (7), thereby improving the unlocking efficiency of the fixed block 1 (7).

6. A hydraulic cylinder with self-locking function for use in a steel mill according to any one of claims 1 to 5, characterized in that: The fixing block 1 (7) and the linkage block (9) are both made of wear-resistant materials.

7. A hydraulic cylinder with self-locking function for use in a steel mill according to claim 6, characterized in that: The outer surface of the cylinder body (1) is coated with anti-corrosion paint.

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