Leak-proof hydraulic oil cylinder and edge rolling machine

Abstract

The invention discloses an anti-leakage hydraulic oil cylinder and an edge rolling machine, and relates to the technical field of hydraulic oil cylinders. Comprising a cylinder base, the cylinder base is provided with a first oil inlet hole, a branch flow channel and a one-way flow channel which are communicated with one another, the cylinder base is fixedly connected with a cylinder barrel, the side, away from the cylinder base, of the cylinder barrel is fixedly connected with a cylinder cover, the cylinder cover and the cylinder base are jointly and fixedly connected with a connecting rod, and the cylinder barrel and the cylinder cover are jointly and slidably connected with a piston rod in a sealed mode; and the flow limiting piece is rotationally connected to the cylinder base, and the flow limiting piece is provided with a flow limiting through hole. The piston rod drives the flow limiting piece to rotate when moving to the stroke terminal, the flow limiting through hole is used for controlling the flow area of hydraulic oil in the branch flow channel to be gradually reduced, the flow area is prevented from being greatly changed, the pressure stability of the hydraulic oil is improved, and the impact of the pressure change of the hydraulic oil on the piston rod is reduced; and the hydraulic oil is prevented from leaking from the contact position of the piston rod and the cylinder barrel.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a leakage-proof hydraulic cylinder and a rolling machine. Background Art

[0002] The hydraulic cylinder is an actuator that converts hydraulic energy into linear or swinging mechanical energy. It is mainly composed of a cylinder seat, a cylinder barrel, a cylinder head, a piston rod, a sealing device and a buffer device. The hydraulic cylinder will produce strong impact, noise and even mechanical collision at the end of the stroke during movement, especially when working under high pressure. This situation is more obvious. For this reason, a buffer device is required to reduce these adverse effects; common buffer devices include a piston with a boss and a cylinder seat with a groove and a small hole. When the piston approaches the cylinder seat, the boss enters the groove, forcing the oil to be discharged through the small hole, increasing the return oil resistance, and achieving the effect of deceleration and buffering; when the above-mentioned buffer device is used for buffering, when the boss enters the groove, the return oil area is greatly reduced, causing the pressure of the hydraulic oil in the hydraulic cylinder to fluctuate greatly. The large fluctuation of the hydraulic oil pressure will have an impact on the piston rod, aggravate the wear of the matching surface of the piston rod and the cylinder barrel, and reduce the sealing performance between the piston rod and the cylinder barrel, shortening the service life of the hydraulic cylinder. Summary of the invention

[0003] The invention provides a leak-proof hydraulic oil cylinder and a rolling machine, so as to overcome the disadvantage that the existing hydraulic oil cylinder will have a large pressure fluctuation during buffering, thereby increasing the wear degree of components in the hydraulic oil cylinder.

[0004] The technical solution is: a leak-proof hydraulic cylinder, comprising: A cylinder seat, wherein the cylinder seat is provided with a first oil inlet hole, a branch flow channel and a one-way flow channel which are interconnected, the cylinder seat is fixedly connected to a cylinder barrel, a cylinder head is fixedly connected to a side of the cylinder barrel away from the cylinder seat, the cylinder head is provided with a second oil inlet hole, the second oil inlet hole, the branch flow channel and the one-way flow channel are all connected to the cylinder barrel, the cylinder head and the cylinder seat are fixedly connected with a connecting rod, and the cylinder barrel and the cylinder head are sealed and slidably connected with a piston rod; A sealing ball is slidably connected in the one-way flow channel and cooperates with the one-way flow channel for sealing; The flow limiting member is rotatably connected to the cylinder seat, and a torsion spring is fixedly connected between the two. The flow limiting member is provided with a limited flow hole, the flow limiting member is provided with a guide groove, and a limiting groove is provided in the cylinder seat. The flow limiting member is slidably connected to a liquid storage member, and the liquid storage member slides in the guide groove and the limiting groove at the same time.

[0005] Furthermore, the cross section of the flow-limiting hole is drop-shaped, the flow-limiting hole is in communication with the branch flow channel, and the flow-limiting member is in sealing cooperation with the branch flow channel.

[0006] Furthermore, the minimum cross-sectional area of ​​the one-way flow channel is equal to the cross-sectional area of ​​the branch flow channel.

[0007] Furthermore, a step portion is provided on the cylinder seat, and a height of the step portion is greater than a height of the flow limiting member.

[0008] Furthermore, it also includes: An extrusion cylinder is sealingly and slidably connected in the liquid storage part, and a spring is fixedly connected between the two; The limiting ring is fixedly connected in the extrusion cylinder, an air storage cylinder is fixedly connected in the extrusion cylinder, a detection piston is sealingly and slidably connected in the air storage cylinder, and the detection piston is fixedly connected to a round table part through a connecting rod.

[0009] Furthermore, a flow groove is provided on a side of the extrusion cylinder away from the liquid storage member, and the extrusion cylinder is extrusion-matched with the piston rod.

[0010] Furthermore, the maximum diameter of the truncated table member is smaller than the inner diameter of the limiting ring.

[0011] Furthermore, the elastic coefficient of the spring between the liquid storage member and the extrusion cylinder is smaller than the elastic coefficient of the torsion spring between the flow limiting member and the cylinder seat.

[0012] A rolling machine, using the above-mentioned anti-leakage hydraulic cylinder, comprises: A mounting seat, wherein the mounting seat is fixedly connected to two supporting seats, the two supporting seats are both equipped with the above-mentioned hydraulic cylinder, the two supporting seats are rotatably connected to two fixed rollers, and the mounting seat is equipped with a power element for providing power to the fixed rollers; A swing seat is slidably connected to the support seat far away from the power element, and the support seat close to the power element is slidably connected to the upper limit position with a sliding seat, and the swing seat and the sliding seat are rotatably connected with a movable roller; A swing telescopic rod is hinged to the mounting seat, and its telescopic end is hinged to the swing seat, the swing seat is rotatably connected to the adjacent piston rod, and the sliding seat is fixedly connected to the adjacent piston rod; Two connecting frames are respectively fixed to the swing seat and the sliding seat, the connecting frame is slidably connected with a mounting member, the mounting member is provided with a mounting frame, two connecting seats are arranged in the mounting frame, the connecting seat close to the movable roller side is fixedly connected to the adjacent mounting frame, the connecting seat away from the movable roller side is slidably connected to the adjacent mounting frame, and the corresponding connecting seats in different mounting frames are rotatably connected with the limiting roller together.

[0013] Furthermore, it also includes: Two threaded knobs, respectively rotatably connected to adjacent connection frames, and threadedly connected to adjacent mounting parts; Two squeezing knobs are respectively threadedly connected to the adjacent mounting frames and rotatably connected to the adjacent connecting seats; Two fasteners are respectively installed between adjacent mounting members and adjacent mounting frames. Friction rings are fixedly connected to the facing sides of the mounting members and the mounting frames. The friction rings on the mounting members are frictionally matched with the friction rings on the adjacent mounting frames.

[0014] In general, compared with the prior art, the above technical scheme conceived by the present invention can achieve the following beneficial effects: the present invention transmits the rotation of the flow limiting member when the piston rod moves to the end of the stroke, and uses the flow limiting hole to control the flow area of ​​the hydraulic oil in the branch flow channel to gradually decrease, thereby avoiding a large change in the flow area, improving the stability of the hydraulic oil pressure, and reducing the impact of the hydraulic oil pressure change on the piston rod, thereby preventing the hydraulic oil from leaking from the contact point between the piston rod and the cylinder; the return oil and the oil inlet of the rodless chamber are controlled respectively by the one-way flow channel and the branch flow channel, and the minimum cross-sectional area of ​​the one-way flow channel and the branch flow channel are made The hydraulic cylinder is equal to the pressure of the hydraulic oil in the cylinder when starting, which ensures the flow rate of the hydraulic oil in the cylinder when starting, so that the hydraulic cylinder can move quickly; by setting the stepped portion, the contact area between the piston rod and the hydraulic oil is increased when starting, so as to ensure the force area of ​​the hydraulic oil squeezing the piston rod, thereby ensuring that the thrust of the hydraulic oil on the piston rod remains basically unchanged, so that the hydraulic cylinder can start smoothly; the extrusion cylinder is used to extend the time of the change of the return oil resistance, and when the pressure of the hydraulic oil in the rodless chamber is high, the change speed of the hydraulic oil flow area is further slowed down, so that the return oil resistance increases slowly, and then the pressure change of the hydraulic oil in the rodless chamber tends to be smooth, preventing the piston rod from being impacted by large changes in pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the swing seat, the sliding seat and the movable roller of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the cylinder barrel, cylinder head and connecting rod of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the cylinder base, cylinder barrel and cylinder cover of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the cylinder seat, the flow limiting component and the liquid storage component of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the flow limiting component, the liquid storage component and the extrusion cylinder of the present invention; Figure 7 An exploded view of the cylinder seat, the flow limiting member and the liquid storage member of the present invention; Figure 8 It is a three-dimensional structural cross-sectional view of the liquid storage member, the extrusion cylinder and the gas storage cylinder of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the flow limiting member, the flow limiting hole and the connecting groove of the present invention; Fig.10 It is a three-dimensional structural schematic diagram of the swing seat, the movable roller and the connecting frame of the present invention; Fig.11 It is a three-dimensional structural cross-sectional view of the connecting frame, the mounting member and the mounting frame of the present invention.

[0016] Figure numbers: 1-mounting seat, 2-support seat, 3-fixed roller, 4-power element, 5-swing seat, 6-sliding seat, 7-moving roller, 8-swing telescopic rod, 9-cylinder seat, 901-first oil inlet hole, 902-branch flow channel, 903-unidirectional flow channel, 904-step portion, 10-cylinder barrel, 11-cylinder head, 111-second oil inlet hole, 12-connecting rod, 13-piston rod, 14-sealing ball, 15-flow limiting member, 15 1-limiting flow hole, 152-connecting groove, 16-liquid storage part, 161-guide groove, 162-limiting groove, 17-extrusion cylinder, 171-circulation groove, 18-limiting ring, 19-air storage cylinder, 20-detection piston, 21-round table part, 22-connecting frame, 23-mounting part, 24-mounting frame, 25-connecting seat, 26-limiting roller, 27-threaded knob, 28-extrusion knob, 29-fastener, 30-friction ring. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0018] A leak-proof hydraulic cylinder, please refer to Figure 1-Figure 7 and Fig. 9, including: a cylinder base 9, the cylinder base 9 is provided with a first oil inlet hole 901, a branch flow channel 902 and a one-way flow channel 903 which are interconnected, the cylinder base 9 is fixedly connected with a cylinder barrel 10, a cylinder cover 11 is fixedly connected with a side of the cylinder barrel 10 away from the cylinder base 9, the cylinder cover 11 is provided with a second oil inlet hole 111, the second oil inlet hole 111, the branch flow channel 902 and the one-way flow channel 903 are all connected with the cylinder barrel 10, the cylinder cover 11 and the cylinder base 9 are jointly fixedly connected with a connecting rod 12, the cylinder barrel 10 and the cylinder cover 11 are jointly sealed and slidably connected with a piston rod 13; a sealing ball 14 is slidably connected in the one-way flow channel 903 and is connected with the one-way flow channel 903 Sealing cooperation; the flow limiting member 15 is rotatably connected to the cylinder seat 9, and a torsion spring is fixed between the two, the flow limiting member 15 is provided with a limited flow hole 151, the flow limiting member 15 is provided with a guide groove 161, and a limiting groove 162 is provided in the cylinder seat 9, the flow limiting member 15 is slidably connected to the liquid storage member 16, and the liquid storage member 16 slides in the guide groove 161 and the limiting groove 162 at the same time; the cross-section of the flow limiting hole 151 is drop-shaped, the flow limiting hole 151 is connected and cooperated with the branch flow channel 902, and the flow limiting member 15 is sealed and cooperated with the branch flow channel 902; the minimum cross-sectional areas of the one-way flow channel 903 and the branch flow channel 902 are equal.

[0019] In the above scheme, it is intended to solve the problem that when the existing hydraulic cylinder is buffering at the end of the stroke, the pressure in the hydraulic cylinder changes greatly, thereby shortening the service life of the hydraulic cylinder; when the existing hydraulic cylinder is started, the hydraulic oil only flows through the small hole, so that the flow rate of the hydraulic oil in the initial stage of starting is low, resulting in a slow starting speed of the hydraulic cylinder; this scheme transmits the rotation of the flow limiting member 15 when the piston rod 13 moves to the end of the stroke, and uses the flow limiting hole 151 to control the flow area of ​​the hydraulic oil in the branch flow channel 902 to gradually reduce, thereby avoiding a large change in the flow area and improving the stability of the hydraulic oil pressure; the piston rod 13, the cylinder barrel 10 and the cylinder head 11 form a rod chamber, and the piston rod 13, the cylinder barrel 10 and the cylinder seat 9 form a rodless chamber; the return oil and the oil inlet of the rodless chamber are respectively controlled by the one-way flow channel 903 and the branch flow channel 902, and the minimum cross-sectional area of ​​the one-way flow channel 903 is equal to the cross-sectional area of ​​the branch flow channel 902 The cross-sectional areas are equal, which ensures the flow rate of the hydraulic oil in the hydraulic cylinder when starting, so that the hydraulic cylinder can move quickly; a sealing ring is installed at the piston of the piston rod 13 to ensure the sealing between the piston rod 13 and the cylinder 10; the sealing ball 14 cooperates with the one-way flow channel 903 to form a one-way valve with the flow direction upward (because the pressure of the hydraulic oil in the hydraulic cylinder is high but the flow rate is low, the sealing ball 14 cannot block the upper part of the one-way flow channel 903 under the action of its own gravity); the flow limiting hole 151 is similar to a water drop shape, and the flow area gradually decreases in the clockwise direction. Initially, the branch flow channel 902 is connected to the end of the flow limiting hole 151 with the largest communication area; the guide groove 161 is an arc groove, which is used to drive the flow limiting part 15 to rotate after being squeezed by the liquid storage part 16, and the central angle corresponding to the horizontal projection of the guide groove 161 is equal to the central angle corresponding to the horizontal projection of the flow limiting hole 151.

[0020] Please refer to Figure 6 A stepped portion 904 is provided on the cylinder seat 9 , and a height of the stepped portion 904 is greater than a height of the flow limiting member 15 .

[0021] The above scheme aims to solve the problem that after the existing boss piston moves to the end of the stroke, the boss enters the groove, so that when it is started again, the force area of ​​the hydraulic oil squeezing the piston is the cross-sectional area of ​​the boss, so that when the pressure of the hydraulic oil remains unchanged, the thrust of the hydraulic oil on the piston is greatly reduced, thereby reducing the maximum load of the hydraulic cylinder during startup; in this scheme, a step portion 904 is provided to prevent the piston rod 13 from directly colliding with the flow limiting member 15, and at the same time increase the contact area between the piston rod 13 and the hydraulic oil during startup to ensure that the force area of ​​the hydraulic oil squeezing the piston rod 13, thereby ensuring that the thrust of the hydraulic oil on the piston rod 13 remains basically unchanged, so that the hydraulic cylinder can be started smoothly.

[0022] Please refer to Figure 6-Figure 8 , and also includes: an extrusion cylinder 17, which is sealingly and slidably connected to the liquid storage part 16, and a spring is fixedly connected therebetween; a limiting ring 18, which is fixedly connected to the extrusion cylinder 17, and an air storage cylinder 19 is fixedly connected to the extrusion cylinder 17, and a detection piston 20 is sealingly and slidably connected to the air storage cylinder 19, and the detection piston 20 is fixedly connected to a truncated table part 21 through a connecting rod; a circulation groove 171 is provided on the side of the extrusion cylinder 17 away from the liquid storage part 16, and the extrusion cylinder 17 is extruded and matched with the piston rod 13; the maximum diameter of the truncated table part 21 is smaller than the inner diameter of the limiting ring 18.

[0023] In the above scheme, the extrusion cylinder 17 is used to extend the rotation time of the flow limiting member 15, thereby extending the duration of the change in the flow area of ​​the branch flow channel 902 and the flow limiting hole 151. When the pressure of the hydraulic oil in the rodless chamber is high, the change speed of the hydraulic oil flow area is further slowed down, so that the return oil resistance increases slowly, and the pressure change of the hydraulic oil in the rodless chamber tends to be smooth, thereby preventing the large pressure change from impacting the piston rod 13; it is detected that there is gas stored between the piston 20 and the air storage cylinder 19, and the relative position of the truncated cone member 21 and the limit ring 18 is adjusted by using the pressure difference between the hydraulic oil in the rodless chamber and the above gas; the truncated cone member 21 is in The diameter gradually decreases from top to bottom, and initially the minimum diameter of the truncated cone 21 is at the same height as the limiting ring 18. The truncated cone 21 is used to fill the middle part of the limiting ring 18 to control the flow area of ​​the hydraulic oil in the liquid storage part 16 when passing through the extrusion cylinder 17; the maximum diameter of the truncated cone 21 is smaller than the inner diameter of the limiting ring 18 to prevent the truncated cone 21 from completely blocking the limiting ring 18; the outer diameter of the extrusion cylinder 17 at the flow groove 171 is equal to the outer diameter of the liquid storage part 16 to prevent the extrusion cylinder 17 from completely entering the liquid storage part 16 under the extrusion of the piston rod 13, so that the hydraulic oil in the liquid storage part 16 cannot be discharged through the extrusion cylinder 17.

[0024] Please refer to Figure 6-Figure 8 The elastic coefficient of the spring between the liquid storage member 16 and the extrusion cylinder 17 is smaller than the elastic coefficient of the torsion spring between the flow limiting member 15 and the cylinder seat 9.

[0025] In the above scheme, the purpose is to achieve the purpose of resetting the flow-limiting member 15 and the liquid storage member 16 before the extrusion cylinder 17, so that when the piston rod 13 is extended for a short distance, the torsion spring and the spring are both in the state of storing force, and as the piston rod 13 moves upward and extends, the flow-limiting member 15 and the liquid storage member 16 move first under the action of the torsion spring, so that when the piston rod 13 moves downward, the piston rod 13 can be buffered by the rotation of the flow-limiting member 15; the flow-limiting member 15 can be provided with a connecting groove 152, so that the liquid storage member 16 and the flow-limiting member 15 are sliding But it is a not sealed connection; the connecting groove 152 is used to make the liquid storage component 16 completely located in the hydraulic oil of the rodless chamber, so as to avoid the change of its moving speed due to the different pressures of the hydraulic oil on the upper and lower sides of the liquid storage component 16; the liquid storage component 16 is completely immersed in the hydraulic oil of the rodless chamber, so that when the liquid storage component 16 moves, it is only subjected to the reaction force of the flow limiting component 15 on the liquid storage component 16, the elastic force of the spring between the liquid storage component 16 and the extrusion cylinder 17, and the force of the extrusion cylinder 17 squeezing the liquid storage component 16 through the hydraulic oil in the liquid storage component 16.

[0026] The working principle of the above scheme is as follows: when it is necessary to use a hydraulic cylinder to push an object to move, the hydraulic cylinder is started, and hydraulic oil is transported to the rodless cavity through the first oil inlet hole 901, the gap between the branch flow channel 902 and the limiting flow hole 151, and the one-way flow channel 903. At this time, the hydraulic oil pushes the sealing ball 14 to move upward and releases the blockage of the one-way flow channel 903. Then, the hydraulic oil in the first oil inlet hole 901 enters the rodless cavity through the one-way flow channel 903, pushing the piston rod 13 upward, and completing the start-up of the hydraulic cylinder (the hydraulic cylinder is in a working state in the attached figure).

[0027] When the hydraulic cylinder needs to be reset after use (i.e., restored to the state where the piston rod 13 is fully retracted in the hydraulic cylinder), hydraulic oil is injected into the rod chamber through the second oil inlet hole 111, so that the piston rod 13 moves downward, and the hydraulic oil in the rodless chamber is squeezed out through the limited flow hole 151, the branch flow channel 902 and the first oil inlet hole 901 in sequence. When the piston rod 13 moves to the end of the stroke, that is, when the piston rod 13 contacts the extrusion cylinder 17, the extrusion cylinder 17 is pushed to move into the liquid storage part 16 and compress the spring in the liquid storage part 16. In this process, The extrusion cylinder 17 squeezes the hydraulic oil stored in the liquid storage part 16, so that the hydraulic oil in the liquid storage part 16 is discharged into the rodless cavity through the gap between the limit ring 18 and the truncated table part 21. In the process of the piston rod 13 squeezing the extrusion cylinder 17, the extrusion cylinder 17 applies an extrusion force to the liquid storage part 16 through the hydraulic oil in the liquid storage part 16, so that the liquid storage part 16 moves downward and drives the flow limiting part 15 to rotate counterclockwise, blocking the branch flow channel 902, reducing the flow area of ​​the hydraulic oil in the rodless cavity when it is discharged, and thereby slowing down the downward movement speed of the piston rod 13.

[0028] As the piston rod 13 squeezes the extrusion cylinder 17 into the liquid storage part 16, the upper part of the extrusion cylinder 17 finally contacts the liquid storage part 16. At this time, the piston rod 13 directly squeezes the liquid storage part 16 downward through the extrusion cylinder 17, and the liquid storage part 16 continues to drive the flow limiting part 15 to rotate until the piston rod 13 contacts the step portion 904 and stops moving. At this time, the piston rod 13 is reset.

[0029] Please refer to Figure 1-Figure 3 and Fig.10 , a rolling machine, using the above-mentioned anti-leakage hydraulic cylinder, the rolling machine includes: a mounting seat 1, the mounting seat 1 is fixedly connected to two supporting seats 2, the two supporting seats 2 are both equipped with the above-mentioned hydraulic cylinder, the two supporting seats 2 are connected to two fixed rollers 3 for rotation together, the mounting seat 1 is equipped with a power element 4 for providing power to the fixed rollers 3; a swing seat 5, slidably connected to the supporting seat 2 away from the power element 4, the upper limit sliding connection of the supporting seat 2 close to the power element 4 is connected with a sliding seat 6, the swing seat 5 and the sliding seat 6 are connected to a movable roller 7 for rotation together; a swing telescopic rod 8, hinged to the mounting seat 1, and its extension The contracted end is hinged to the swing seat 5, the swing seat 5 is rotationally connected to the adjacent piston rod 13, and the sliding seat 6 is fixedly connected to the adjacent piston rod 13; two connecting frames 22 are respectively fixed to the swing seat 5 and the sliding seat 6, the connecting frame 22 is slidably connected with a mounting member 23, the mounting member 23 is provided with a mounting frame 24, and two connecting seats 25 are provided in the mounting frame 24, the connecting seat 25 on the side close to the movable roller 7 is fixedly connected to the adjacent mounting frame 24, and the connecting seat 25 on the side away from the movable roller 7 is slidably connected to the adjacent mounting frame 24, and the corresponding connecting seats 25 in different mounting frames 24 are rotatably connected together with a limiting roller 26.

[0030] In the above scheme, it is intended to solve the problem that during the use of the existing rolling machine, due to the stress of the plate itself, the plate fails to reach the predetermined curvature after being bent, causing overlap or gap on both sides of the plate, resulting in overlap or gap at the final cylindrical joint, which is not conducive to the subsequent welding of the cylinder joint; the power element 4 is composed of a motor and a reducer; the swing seat 5 can swing under the action of the swing telescopic rod 8 and lose contact with the moving roller 7. At this time, the left side of the formed cylindrical automatic roller 7 can be removed; a baffle can be set on the right support seat 2 to allow the sliding seat 6 to slide within the upper limit of the support seat 2, and the position of the moving roller 7 is maintained by the sliding seat 6; there is a gap between the two limiting rollers 26, and the plate after being bent by the fixed roller 3 and the moving roller 7 passes through the limiting roller 26, and the bent plate is guided by the two limiting rollers 26 to reduce the probability of overlap or gap at both ends of the plate.

[0031] Please refer to Fig.10 and Fig.11, and also includes: two threaded knobs 27, which are respectively rotatably connected to adjacent connection frames 22 and threadedly connected to adjacent mounting members 23; two extrusion knobs 28, which are respectively threadedly connected to adjacent mounting frames 24 and rotatably connected to adjacent connection seats 25; two fasteners 29, which are respectively installed between adjacent mounting members 23 and adjacent mounting frames 24, and friction rings 30 are fixedly connected to the facing sides of the mounting members 23 and the mounting frames 24, and the friction rings 30 on the mounting members 23 are frictionally matched with the friction rings 30 on the adjacent mounting frames 24.

[0032] In the above scheme, the position and angle of the two limiting rollers 26 are adjustable; the relative position between the mounting member 23 and the mounting frame 24 is maintained by the fit of the two friction rings 30; the friction rings 30 can be made of rubber or other materials, and can generate a large static friction force when the two friction rings 30 are in contact and squeezed; the fasteners 29 can be bolts and nuts; by turning the threaded knob 27, the distance between the limiting roller 26 and the movable roller 7 can be changed; by turning the squeezing knob 28, the distance between the two limiting rollers 26 (i.e., the thickness of the plate) can be adjusted; by loosening the fasteners 29, the relative angle between the mounting member 23 and the mounting frame 24 can be changed, thereby changing the angle between the two limiting rollers 26 relative to the horizontal plane.

[0033] The working principle of the above scheme is as follows: when it is necessary to use a rolling machine to process the plate into a cylinder, the worker moves the plate to the front of the rolling machine and places it between the fixed roller 3 and the movable roller 7. By controlling the position of the two piston rods 13, the distance between the movable roller 7 and the fixed roller 3 is controlled. Then the worker starts the power element 4, and the power element 4 drives the two fixed rollers 3 to rotate in the same direction, driving the plate to move, and the fixed roller 3 is used to support the lower side of the plate. At the same time, the movable roller 7 is used to squeeze the plate so that the plate is bent into a required curvature. The bent plate moves around the movable roller 7 and contacts the two limiting rollers 26. At this time, the plate is guided by the two limiting rollers 26 and moves to a predetermined position. For example, the curvature of the plate is greater than the predetermined curvature. At this time, the plate first contacts the front limiting roller 26 in the process of moving around the movable roller 7. The front limiting roller 26 moves the plate between the two limiting rollers 26, so that the bent end of the plate can abut against the other end of the plate. In this way, through the guidance of the limiting roller 26, the probability of overlap and gap on both sides of the plate is reduced.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A leak-proof hydraulic cylinder, characterized in that: include: A cylinder base (9), the cylinder base (9) being provided with a first oil inlet hole (901), a branch flow channel (902) and a one-way flow channel (903) which are interconnected, the cylinder base (9) being fixedly connected to a cylinder barrel (10), a side of the cylinder barrel (10) which is away from the cylinder base (9) being fixedly connected to a cylinder head (11), the cylinder head (11) being provided with a second oil inlet hole (111), the second oil inlet hole (111), the branch flow channel (902) and the one-way flow channel (903) being all in communication with the cylinder barrel (10), the cylinder head (11) and the cylinder base (9) being fixedly connected with a connecting rod (12), and the cylinder barrel (10) and the cylinder head (11) being sealed and slidably connected with a piston rod (13); A sealing ball (14) is slidably connected in the one-way flow channel (903) and cooperates with the one-way flow channel (903) to seal; The flow limiting member (15) is rotatably connected to the cylinder seat (9), and a torsion spring is fixedly connected therebetween; the flow limiting member (15) is provided with a limited flow hole (151); the flow limiting member (15) is provided with a guide groove (161); a limit groove (162) is provided in the cylinder seat (9); the flow limiting member (15) is slidably connected to a liquid storage member (16); and the liquid storage member (16) slides in the guide groove (161) and the limit groove (162) at the same time.

2. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: The cross section of the flow limiting hole (151) is drop-shaped, the flow limiting hole (151) is in communication with the branch flow channel (902), and the flow limiting member (15) is in sealing cooperation with the branch flow channel (902).

3. The anti-leakage hydraulic cylinder according to claim 2, characterized in that: The minimum cross-sectional area of ​​the one-way flow channel (903) is equal to the cross-sectional area of ​​the branch flow channel (902).

4. The anti-leakage hydraulic cylinder according to claim 3, characterized in that: The cylinder seat (9) is provided with a stepped portion (904), and the height of the stepped portion (904) is greater than the height of the flow limiting member (15).

5. The anti-leakage hydraulic cylinder according to claim 4, characterized in that: Also includes: An extrusion cylinder (17) is sealingly and slidably connected to the liquid storage member (16), and a spring is fixedly connected between the two; A limit ring (18) is fixedly connected in the extrusion cylinder (17), an air storage cylinder (19) is fixedly connected in the extrusion cylinder (17), a detection piston (20) is sealingly and slidably connected in the air storage cylinder (19), and the detection piston (20) is fixedly connected to a truncated table member (21) via a connecting rod.

6. The anti-leakage hydraulic cylinder according to claim 5, characterized in that: A flow groove (171) is provided on a side of the extrusion cylinder (17) away from the liquid storage member (16), and the extrusion cylinder (17) is extrusion-matched with the piston rod (13).

7. The anti-leakage hydraulic cylinder according to claim 6, characterized in that: The maximum diameter of the truncated table member (21) is smaller than the inner diameter of the limiting ring (18).

8. The anti-leakage hydraulic cylinder according to claim 7, characterized in that: The elastic coefficient of the spring between the liquid storage member (16) and the extrusion cylinder (17) is smaller than the elastic coefficient of the torsion spring between the flow limiting member (15) and the cylinder seat (9).

9. Rolling machine, characterized by: The rolling machine uses a leak-proof hydraulic cylinder as claimed in claim 8, and the rolling machine comprises: A mounting seat (1), wherein the mounting seat (1) is fixedly connected to two support seats (2), the two support seats (2) are each provided with the above-mentioned hydraulic cylinder, the two support seats (2) are rotatably connected to two fixed rollers (3), and the mounting seat (1) is provided with a power element (4) for providing power to the fixed rollers (3); A swing seat (5) is slidably connected to the support seat (2) away from the power element (4); the support seat (2) close to the power element (4) is slidably connected to the upper limit position with a sliding seat (6); the swing seat (5) and the sliding seat (6) are rotatably connected to a movable roller (7); A swing telescopic rod (8) is hinged to the mounting seat (1), and its telescopic end is hinged to the swing seat (5), the swing seat (5) is rotatably connected to the adjacent piston rod (13), and the sliding seat (6) is fixedly connected to the adjacent piston rod (13); Two connecting frames (22) are respectively fixedly connected to the swing seat (5) and the sliding seat (6); the connecting frame (22) is slidably connected to a mounting member (23); the mounting member (23) is provided with a mounting frame (24); two connecting seats (25) are provided in the mounting frame (24); the connecting seat (25) on the side close to the movable roller (7) is fixedly connected to the adjacent mounting frame (24); the connecting seat (25) on the side away from the movable roller (7) is slidably connected to the adjacent mounting frame (24); and the corresponding connecting seats (25) in different mounting frames (24) are rotatably connected to a limiting roller (26) together.

10. The anti-leakage hydraulic cylinder according to claim 9, characterized in that: Also includes: Two threaded knobs (27) are respectively rotatably connected to adjacent connection frames (22) and are threadably connected to adjacent mounting members (23); Two squeezing knobs (28) are respectively threadedly connected to adjacent mounting frames (24) and are rotatably connected to adjacent connecting seats (25); Two fasteners (29) are respectively installed between adjacent mounting members (23) and adjacent mounting frames (24); friction rings (30) are fixedly connected to the facing sides of the mounting members (23) and the mounting frames (24); the friction rings (30) on the mounting members (23) are frictionally matched with the friction rings (30) on the adjacent mounting frames (24).

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