Locking hydraulic cylinder

Abstract

The locking hydraulic cylinder comprises a cylinder body and a piston rod, a connecting assembly and a pressing head are arranged at the end, away from the cylinder body, of the piston rod, and the pressing head is rotationally connected with a piston through the connecting assembly. The included angle between the pressure head and the plane can be adjusted, so that the pressure head is in surface contact with the foot stool of the rolling mill equipment, the locking effect is enhanced, meanwhile, compared with a traditional mode, screw fixation is omitted, and damage to the piston rod caused by stress concentration is avoided. Furthermore, a first groove for containing the pressing head is formed in the end of the piston rod, the first groove can be an arc-shaped groove, meanwhile, the pressing head is provided with an arc-shaped surface, the arc-shaped surface is matched with the circle center of the arc-shaped groove, pressure transmission between the piston rod and the pressing head is kept while rotation of the pressing head is met, the pressing head is evenly stressed, and stress concentration is avoided. The locking hydraulic cylinder is good in locking effect, the risk that the piston rod is damaged is reduced, the service life of the locking hydraulic cylinder is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic cylinders, and in particular to a locking hydraulic cylinder. Background Art

[0002] During the steel rolling production process, the locking hydraulic cylinder is used to fix the rolling mill equipment. The locking hydraulic cylinder ensures the quality and precision of the steel plate during the rolling process through its precise hydraulic control and strong locking force.

[0003] Currently, the locking hydraulic cylinders used in steel rolling production have a pressure head installed at the contact end of the piston rod with the rolling mill equipment's foot frame. This pressure head is fixed to the piston rod via screws, and the direction of the pressure head is difficult to adjust. Rolling mill equipment of different specifications and models has different foot frame structures. When using traditional locking hydraulic cylinders for fixing, the pressure head's direction is difficult to adjust, making it impossible to ensure that the pressure head and the locking hydraulic cylinder maintain surface contact. Line contact or point contact may occur, resulting in poor fixing effect and easy wear on the rolling mill's steel foot frame. In addition, due to the use of screws for fixing, the end of the piston rod is subjected to concentrated force. Once wear occurs, the locking mechanism is prone to failure, reducing the service life of the locking hydraulic cylinder and affecting the operation of the production line. Utility Model Content

[0004] The present application provides a locking hydraulic cylinder to solve the problem that the direction of the pressure head of the existing locking hydraulic cylinder is difficult to adjust during the locking and fixing process, thereby causing locking failure and reducing the service life of the hydraulic cylinder.

[0005] The locking hydraulic cylinder provided in the present application includes a cylinder body and a piston rod. The end of the piston rod away from the cylinder body is provided with a connecting assembly and a pressure head, and the pressure head is rotatably connected to the piston through the connecting assembly.

[0006] By setting up a connecting component, a rotational connection between the pressure head and the piston is achieved, so that the angle between the pressure head and the plane can be adjusted, thereby maintaining surface contact between the pressure head and the rolling mill equipment stand, thereby enhancing the locking effect. At the same time, compared with the traditional method, the screw fixation is eliminated, avoiding stress concentration and damage to the piston rod.

[0007] In a feasible implementation, the connecting component is a connecting plate; the first end of the connecting plate is fixedly connected to the piston rod, the second end of the connecting plate is provided with a second through hole, and the pressure head includes a rotating shaft, which is rotatably connected to the second through hole.

[0008] In a feasible implementation, a limiting groove is further provided at the second end of the connecting piece, and the pressing head includes a limiting platform, and the limiting platform and the limiting groove are engaged with each other to control the rotation of the pressing head.

[0009] In a feasible implementation, there is a gap between the limiting platform and the limiting groove, and the width of the gap is 0.5 mm-1 mm.

[0010] In a feasible embodiment, a first through hole is provided at the first end of the connecting plate, a second groove is provided at the end of the piston rod, a first threaded hole is provided in the second groove, and a bolt passes through the first through hole and is threadedly connected with the first threaded hole to fix the connecting plate.

[0011] In a feasible implementation, the piston rod is provided with a first groove; the pressure head is located in the first groove.

[0012] In a feasible implementation, the pressure head includes a first plane and an arc surface; the second groove is an arc groove, the arc surface is arranged opposite to the arc groove, and the arc surface is matched with the center of the arc groove.

[0013] The setting of the arc groove and the arc surface ensures the transmission of pressure between the piston rod and the pressure head while satisfying the rotation of the pressure head, so that the pressure head can more smoothly disperse the force to the entire contact surface when under pressure, avoiding the problem of local stress concentration and helping to extend the service life of the component.

[0014] In a feasible implementation, the arc-shaped groove is provided with a guide groove, the arc surface is provided with a guide protrusion, the guide protrusion is located in the guide groove, and the guide protrusion is connected to the guide groove in a sliding fit.

[0015] In a feasible implementation, it is characterized in that it further includes a second plane; two sides of the second plane are respectively connected to the first plane and the arc surface.

[0016] In a feasible implementation, the surface of the first plane and / or the second plane is provided with a groove for anti-slip.

[0017] The locking hydraulic cylinder provided by the present application includes a cylinder body and a piston rod. A connecting assembly and a pressure head are provided at one end of the piston rod away from the cylinder body. The pressure head is rotatably connected to the piston through the connecting assembly. The angle between the pressure head and the plane can be adjusted so that the pressure head maintains surface contact with the rolling mill equipment stand, thereby enhancing the locking effect. At the same time, compared with the traditional method, the screw fixation is eliminated, thereby avoiding stress concentration and damage to the piston rod. Furthermore, a first groove for accommodating the pressure head is provided at the end of the piston rod, and the first groove can be set as an arc groove. At the same time, the pressure head is provided with an arc surface, and the arc surface cooperates with the center of the arc groove. While satisfying the rotation of the pressure head, the pressure transmission between the piston rod and the pressure head is maintained, so that the pressure head is evenly stressed and stress concentration is avoided. The locking hydraulic cylinder provided by the present application has a good locking effect. At the same time, it reduces the risk of damage to the piston rod, increases the service life of the locking hydraulic cylinder, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the end portion of the existing locking hydraulic cylinder;

[0020] Figure 2 It is a schematic diagram of the overall structure of the locking hydraulic cylinder provided by this application;

[0021] Figure 3 It is a schematic diagram of the structure of the piston rod end;

[0022] Figure 4 Schematic diagram of the connecting piece structure;

[0023] Figure 5 Schematic diagram of the connection between the connecting piece and the piston rod;

[0024] Figure 6 It is a schematic diagram of the connection between the connecting rod and the piston rod;

[0025] Figure 7 It is a schematic diagram of the pressure head structure.

[0026] Description of reference numerals:

[0027] Among them, 1-cylinder body; 11-mounting hole; 2-piston rod; 21-first groove; 22-second groove; 23-first threaded hole; 24-guide groove; 25-connecting part; 251-third through hole; 252-second threaded hole; 3-connecting plate; 31-second through hole; 32-limiting groove; 33-first through hole; 4-pressure head; 41-rotating shaft; 42-second plane; 43-first plane; 431-anti-slip groove; 44-arc surface; 441-guide protrusion; 442-limiting platform; 45-fourth through hole; 5-connecting rod. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] Reference Figure 1 As shown, Figure 1 This is a schematic diagram of the end structure of a conventional locking hydraulic cylinder. During steel production, the locking hydraulic cylinder is used to secure rolling mill equipment. During operation, the rolling mill is placed on an anchor plate, with the cylinder body 1 of the locking hydraulic cylinder fixedly connected to the anchor plate. The end of the locking hydraulic cylinder's piston rod 2, distal from the cylinder body 1, rests against the rolling mill's footrest. A transition slope exists between the rolling mill's footrest and the anchor plate. A ram 4 is mounted on the end of the piston rod 2, which abuts the transition slope. Since the slopes of the transition slopes of the stands of different rolling mill equipment are different, and in the traditional locking hydraulic cylinder, the pressure head 4 and the piston rod 2 are fixedly connected with screws, the angle of the pressure head 4 is difficult to adjust. Therefore, in the process of pressing the pressure head 4 against the transition slope, the pressure head 4 cannot guarantee contact with the transition slope surface, and may be line contact or point contact, which causes stress concentration and causes excessive wear of the local rolling mill stand. At the same time, the locking hydraulic cylinder piston rod 2 is subjected to lateral force, resulting in uneven extrusion pressure of the piston rod 2 on the internal seal of the locking hydraulic cylinder, damaging the seal of the locking hydraulic cylinder, and thereby reducing the service life of the locking hydraulic cylinder. In addition, this situation can easily cause locking failure, affecting the use and operation of the equipment.

[0030] The locking hydraulic cylinder provided by the present application is designed to rotate the pressure head 4 so that the angle between the end face of the pressure head 4 and the horizontal plane can be adjusted, thereby ensuring that the pressure head 4 maintains surface contact with the binding machine stand during use, thereby avoiding the problems existing in the use of locking hydraulic cylinders. The locking hydraulic cylinder provided by the present application is described in detail below with reference to the accompanying drawings.

[0031] Example:

[0032] Reference Figure 2 As shown, Figure 2 The figure is a schematic diagram of the overall structure of the locking hydraulic cylinder provided in this application. The locking hydraulic cylinder comprises a cylinder body 1 and a piston rod 2. A connecting assembly and a ram 4 are provided at the end of the piston rod 2, distal from the cylinder body 1. The ram 4 is rotatably connected to the piston rod 2 via the connecting assembly. The rotation of the ram 4 allows the angle between its end face and the plane to be adjusted, thereby maintaining surface contact with the rolling mill equipment leg, enhancing the locking effect and improving the applicability of the locking hydraulic cylinder.

[0033] Specifically, the connecting assembly is used to connect the piston rod 2 and the pressure head 4. One end of the connecting assembly is fixedly connected to the piston rod 2, and the other end of the connecting assembly is rotatably connected to the pressure head 4. The connecting assembly can take various forms, such as a connecting plate. When a connecting plate is used for connection, the first end of the connecting plate is fixedly connected to the piston rod. The connection method can be welding, riveting, or bolting. In this case, a rotating shaft can be provided between the second end of the connecting plate and the pressure head to achieve rotation of the pressure head. The following is an explanation with reference to the accompanying drawings.

[0034] Reference Figure 3 and Figure 4 As shown, Figure 3 It is a schematic diagram of the piston rod end structure. Figure 4 Schematic diagram of the connecting piece structure. The connecting assembly can have many forms. As an example, two forms are listed in this embodiment for illustration. The specific description is as follows:

[0035] Form 1: The connecting component is configured as a connecting plate 3, the first end of the connecting plate 3 is fixedly connected to the piston rod 2, and specifically, a second groove 22 is provided at the end of the piston rod 2, a first threaded hole 23 is provided in the second groove 22, and a first through hole 33 is provided at the first end of the connecting plate 3, and a bolt passes through the first through hole 33 and is threadedly connected to the first threaded hole 23 to fix the connecting plate 3.

[0036] During assembly, in some embodiments, two second grooves 22 are symmetrically formed at both ends of the piston rod 2, and two connecting pieces 3 are respectively installed in the two second grooves 22. When the two second grooves 22 are parallel to each other, the connecting piece 3 is a strip-shaped piece, the first end of the connecting piece 3 is connected to the second groove 22, and the other end of the connecting piece 3 is used to connect to the pressure head 4; when the two first grooves 22 have a certain angle, the connecting piece 3 can be bent accordingly to ensure the installation of the pressure head 4, refer to Figure 5 As shown, Figure 5 This is a schematic diagram of the connection between the connecting piece and the piston rod. This application does not limit the form of the connecting piece 4.

[0037] A second through hole 31 is provided at the second end of the connecting piece 3, and the pressure head 4 is provided with a rotating shaft 41, which is located at both ends of the pressure head 4. When the connecting piece 3 and the pressure head 4 are assembled, the rotating shaft 41 rotates and cooperates with the second through hole 31 to achieve angle adjustment of the pressure head 4.

[0038] In addition, in some other embodiments, a connecting piece 3 may also be provided. In this case, a connecting head of a pressure head 4 may be reserved during processing of the piston rod 2, and a through hole for installing the rotating shaft 41 is provided on the connecting head 4. During assembly, the rotating shaft 41 at one end of the pressure head 4 is rotatably connected to the through hole on the connecting head of the piston rod 2, and the other end of the pressure head 4 is rotatably connected to the second through hole 31 on the connecting piece 3. As can be imagined by those skilled in the art, this method is not shown in the figure.

[0039] Form 2: The connecting component is set as connecting rod 5, refer to Figure 6 As shown, Figure 6 This figure illustrates the connection between the connecting rod and the piston rod. A connecting portion 25 for mounting the connecting rod 5 is provided at the end of the piston rod 2. Two connecting portions 25 are symmetrically arranged on either side of the piston rod 2. One connecting portion 25 defines a third through hole 251, and the other defines a second threaded hole 252. External threads are provided at both ends of the connecting rod 5. The ram 4 defines a fourth through hole 45 for the connecting rod 5 to pass through.

[0040] During assembly, one end of the connecting rod 5 passes through the third through hole 251 and the fourth through hole 45 in sequence, and then is threadedly connected to the second threaded hole 252. The other end of the connecting rod 5 is fixed with a nut. At this time, the pressure head 4 is rotatably connected to the connecting rod 5, and the angle of the pressure head 4 can also be adjusted.

[0041] Reference Figure 4 and Figure 5 As shown, Figure 4 It is a schematic diagram of the connecting piece structure. Figure 7 It is a schematic diagram of the pressure head structure. In some embodiments, the connecting plate 3 also includes a limit groove 32; the pressure head 4 includes a limit platform 442; the rotating shaft 41 is rotatably connected to the second through hole 31, and there is a gap L between the limit platform 442 and the limit groove 32. When the pressure head 4 rotates, one end of the limit platform 442 rises and the other end lowers, and the raised end of the limit platform 442 abuts against the limit groove 32, and the pressure head 4 stops rotating. It can be seen that the setting of the gap L enables the rotation of the pressure head 4, and the size of the gap L determines the amplitude by which the pressure head 4 can rotate. The size of the gap L can be determined according to the specific size of the rolling mill equipment. As an example, in this embodiment, the width of the gap L is set to 0.5mm-1mm to meet the angle adjustment of the pressure head 4.

[0042] Furthermore, it is understood that referring to Figure 6As shown, when the connecting assembly adopts a connecting rod structure, the limiting groove 32 can be set at the end of the piston rod 2. At this time, the limiting platform 442 is a plane 46 located on the peripheral surface of the pressure head 4 and arranged opposite to the limiting groove 32.

[0043] Reference Figure 3 As shown, Figure 3 : is a side view schematic diagram of a locking hydraulic cylinder. In some embodiments, the piston rod 2 is provided with a first groove 21; the pressure head 4 is located in the first groove 21. The pressure head 4 includes a first plane 43 and an arc surface 44; the first groove 21 is an arc-shaped groove, and the arc surface 44 is arranged relative to the arc-shaped groove, and the arc surface 44 is matched with the center of the arc-shaped groove. The provision of the first groove 21 increases the contact area between the piston rod 2 and the pressure head 4, so that the locking force between the two can be transmitted more evenly and effectively, thereby improving the stability and reliability of the overall structure, reducing the risk of loosening or damage caused by factors such as uneven force or vibration, and thus improving the stability and durability of the entire structure.

[0044] Reference Figure 3 and Figure 7 As shown, Figure 3 It is a schematic diagram of the piston rod end structure. Figure 7 Schematic diagram of the ram structure. In some embodiments, a guide groove 24 is provided in the first groove 21, and a guide protrusion 441 is provided on the arc surface 44. The guide protrusion 441 is located in the guide groove 24, and the guide protrusion 441 is slidably connected to the guide groove 24. The provision of the guide groove 24 and the guide protrusion 441 enables the ram 4 to move along a predetermined trajectory during installation and adjustment, thereby improving positioning accuracy and avoiding poor locking effect or damage due to position deviation. In addition, the stability of the connection between the ram 4 and the piston rod 2 is enhanced, and when subjected to lateral force, the movement of the ram 4 is restricted to prevent it from disengaging from the first groove 21.

[0045] There is at least one guide groove 24 , which is perpendicular to the axial direction of the first groove 21 . When there are multiple guide grooves 24 , the multiple guide grooves 24 are parallel to each other and distributed along the axial direction of the first groove 21 .

[0046] Continue to refer to Figure 7 As shown, in some embodiments, a second plane 42 is further included; the two sides of the second plane 42 are connected to the first plane 43 and the arc surface 44, respectively. During use, the first plane 43 abuts the transition slope of the rolling mill equipment stand, and at this time, the second plane 42 abuts the vertical surface of the rolling mill equipment stand that is perpendicular to the ground. The provision of the second plane 42 not only enhances the locking effect, but also strengthens the structural strength of the pressure head 4 itself, improving the overall stability and safety of the rolling mill equipment. When subjected to external forces, the second plane 42 can share some of the pressure, reducing the burden on the first plane 43 and extending the service life of the pressure head 4.

[0047] Continue to refer to Figure 7 As shown, in some embodiments, the surfaces of the first plane 43 and / or the second plane 42 are provided with anti-slip grooves 431. Here, "and / or" means that grooves 431 can be provided on both the first plane 43 and the second plane 42, or only on the first plane 43 while not on the second plane 42, or only on the second plane 42 while not on the first plane 43. Grooves 431 can enhance the friction between the first plane 43 and / or the second plane 42 and the rolling mill equipment stand or other contact surfaces, helping to prevent the ram from slipping or falling off when subjected to vibration, impact, or load changes, thereby ensuring the stability and reliability of the locking effect. In addition, in other embodiments, anti-slip pads, such as rubber pads, can be provided on the first plane 43 and / or the second plane 42 to enhance the anti-slip effect while reducing the impact of vibration on the piston rod 2.

[0048] It should also be noted that, in some embodiments, the material of the pressure head 4 can be 42CrMo steel, and the arc surface of the pressure head 4 is laser quenched, the thickness of the hardened layer is not less than 3 mm, and the hardness reaches HRC60. The improvement of the material and the laser quenching process can improve the wear resistance of the pressure surface, thereby increasing the service life of the locking hydraulic cylinder.

[0049] In some embodiments, the cylinder body 1 is provided with a mounting hole 11 for fixing the locking hydraulic cylinder. During installation, a screw passes through the mounting hole 11 to fix the locking hydraulic cylinder to the anchor plate.

[0050] In order to deepen the understanding of the solution proposed in this application, the assembly process of the locking hydraulic cylinder provided in this application is described below. As an example, taking the connecting component as the connecting piece 3 as an example, the specific description is as follows:

[0051] During processing, a first groove 21 and a second groove 22 are formed at the end of the piston rod 2 away from the cylinder body 1, wherein the first groove 21 is located below the central axis of the piston rod 2, and the two second grooves 22 are parallel to each other, perpendicular to the first groove 21 and extend into the first groove 21. A first threaded hole 23 is formed in the second groove 22.

[0052] During assembly, place a connecting piece 3 in one of the second grooves 22, and the first through hole 33 of the connecting piece 3 corresponds to the position of the first threaded hole 23. After the bolt passes through the first through hole 33, it is threadedly engaged with the first threaded hole 23 and tightened to fix the connecting piece 3. Then, place the pressing head 4 in the first groove 21, and align the guide protrusion 441 with the guide groove 24. At this time, the rotating shaft 41 at one end of the pressing head 4 is inserted into the second through hole 31 opened under the connecting piece 3, and then place another connecting piece 3 in the second groove 22 where the connecting piece is not installed. At this time, the rotating shaft 41 at the other end of the pressing head 4 is inserted into the second through hole 31 of the connecting piece that is installed again, and fix the connecting piece 3 with bolts to complete the installation.

[0053] The locking hydraulic cylinder provided in this application utilizes a rotatable pressure head design, allowing the pressure head angle to be adjusted according to the actual conditions of the rolling mill equipment stand, achieving surface-contact locking and improving the applicability and flexibility of the locking hydraulic cylinder. Furthermore, through multiple surface contacts between the pressure head and the rolling mill equipment stand (such as the transition slope and vertical surface between the first plane, the second plane, and the rolling mill stand), as well as the use of anti-skid grooves or anti-skid pads, the locking effect is significantly enhanced, improving the stability and reliability of the overall structure. Furthermore, the second groove on the piston rod cooperates with the curved surface of the pressure head, increasing the contact area and making the locking force more evenly transmitted, reducing the risk of loosening or damage due to uneven force. At the same time, the provision of guide grooves and guide protrusions further enhances the stability of the connection.

[0054] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A locking hydraulic cylinder, comprising a cylinder body (1) and a piston rod (2), characterized in that: The piston rod (2) is provided with a connecting assembly and a pressure head (4) at one end away from the cylinder body (1), and the pressure head (4) is rotatably connected to the piston rod (2) through the connecting assembly; the connecting assembly is a connecting piece (3); the first end of the connecting piece (3) is fixedly connected to the piston rod (2), and the second end of the connecting piece (3) is provided with a second through hole (31); the pressure head (4) includes a rotating shaft (41), and the rotating shaft (41) is rotatably connected to the second through hole (31); The second end of the connecting piece (3) is further provided with a limiting groove (32), and the pressing head (4) includes a limiting platform (442), and the limiting platform (442) and the limiting groove (32) are engaged to control the rotation of the pressing head (4).

2. The locking hydraulic cylinder according to claim 1, characterized in that: There is a gap between the limiting platform (442) and the limiting groove (32), and the width of the gap is 0.5 mm-1 mm.

3. The locking hydraulic cylinder according to claim 1, characterized in that: A first through hole (33) is provided at the first end of the connecting piece (3), a second groove (22) is provided at the end of the piston rod (2), a first threaded hole (23) is provided in the second groove (22), and a bolt passes through the first through hole (33) and is threadedly connected to the first threaded hole (23) to fix the connecting piece (3).

4. The locking hydraulic cylinder according to claim 1, characterized in that: The piston rod (2) is provided with a first groove (21); the pressure head (4) is located in the first groove (21).

5. The locking hydraulic cylinder according to claim 4, characterized in that: The pressure head (4) includes a first plane (43) and a curved surface (44); the first groove (21) is an arcuate groove, the curved surface (44) is arranged opposite to the inside of the arcuate groove, and the curved surface (44) is matched with the center of the arcuate groove.

6. The locking hydraulic cylinder according to claim 5, characterized in that: The arc-shaped groove is provided with a guide groove (24), the arc surface (44) is provided with a guide protrusion (441), the guide protrusion (441) is located in the guide groove (24), and the guide protrusion (441) is connected to the guide groove (24) in a sliding manner.

7. The locking hydraulic cylinder according to claim 5, characterized in that: It also includes a second plane (42); two sides of the second plane (42) are respectively connected to the first plane (43) and the arc surface (44).

8. The locking hydraulic cylinder according to claim 7, characterized in that: The surface of the first plane (43) and / or the second plane (42) is provided with a groove (431) for anti-slip.

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