Rack base locking oil cylinder of bar mill and bar mill

Abstract

The utility model relates to the technical field of hydraulic equipment, and discloses a rack base locking oil cylinder of a bar mill and the bar mill. The oil cylinder comprises a cylinder body, a piston, a piston rod and a locking rod, a containing cavity is formed in the cylinder body, the locking rod, the piston rod and the piston are coaxially arranged and sequentially connected in the extending direction of the axis of the containing cavity, the piston and the piston rod are arranged in the containing cavity, one end of the locking rod extends into the containing cavity to be connected with the piston rod, and the other end of the locking rod is located outside the containing cavity. In the two ends, connected with each other, of the locking rod and the piston rod, one forms a first concave spherical surface, the other forms a first convex spherical surface, the first concave spherical surface is in sliding fit with the first convex spherical surface, and after a gap exists between the locking rod and the guide sleeve or the locking rod is abraded, the locking rod can deflect relative to the piston rod; the locking rod and the piston rod are locked in the direction of the axis of the containing cavity. According to the locking oil cylinder, radial unbalance loading force borne by the piston rod and the piston can be effectively reduced, the sealing performance in the cylinder body is guaranteed, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a frame base locking oil cylinder of a bar rolling mill and a bar rolling mill component. Background Art

[0002] The main production line for continuous bar rolling has 16 sets of general stands for primary, secondary and pre-finishing rolling, with 8 sets installed horizontally and 8 sets installed vertically. Each set of stands is locked and fixed by 4 non-standard oil cylinders (2 on each side), with a total of 64 locking cylinders on the entire line. After oil is inletted from port A and drained from port B, the hydraulic system pressure reaches 80 bar, the wear-resistant block on the piston rod presses the stand base, and the stand cannot move upward. It is positioned left and right by the slide plate on the stand base. The existing locking status of the locking cylinder is as follows: Figure 1 and Figure 2 As shown, when the piston rod 033 extends and presses the frame base 011, the piston rod 033 pushes forward with a force f. The pressure surface of the frame base 011 is an inclined surface. The force on the inclined surface is a force f2 upward along the inclined surface and a force f1 downward perpendicular to the inclined surface. The force is mutual, and the pressing surface of the piston rod is also subjected to a force f3 upward perpendicular to the inclined surface. As a result, the piston rod is subjected to a radial force f4 in the radial direction. Under the action of the radial force f4, the piston rod presses the guide sleeve upward. Due to the matching tolerance between the piston rod 033 and the guide sleeve, the guide sleeve and the cylinder body 031 have a certain degree of clearance. The oil cylinder piston rod 033 is subject to a large radial offset load. When locked, the centerline of the piston rod 033 cannot coincide with the centerline of the cylinder body 031, resulting in a large total offset load gap between the piston rod and the lower end of the guide sleeve. The production line operates in a harsh environment, and water and dust are easily introduced into the rod cavity by the piston rod. The guide sleeve is also subject to the impact of the peak rolling force of the frame, the extrusion of the offset load, and the erosion of iron oxide scale. The matching surfaces of the piston rod 033 and the guide sleeve, and the piston 032 and the cylinder body 031 are easily damaged, causing premature damage to the shaft seal and piston seal, resulting in internal and external leakage of the oil cylinder and unstable locking force. The permanent compression set of the polymer material in the oil cylinder sealing rubber is related to the amount of force. When the piston rod is subjected to radial force, the service life of the seal is severely reduced, resulting in permanent deformation, reduced resilience, and even seal failure.

[0003] As can be seen from the above, excessive radial offset load on the cylinder piston rod can easily damage various components within the cylinder, seriously affecting the seal life and service life of the hydraulic cylinder, and making the hydraulic cylinder's locking force on the frame unstable. Therefore, how to reduce the radial offset load on the piston rod has become a pressing issue. Utility Model Content

[0004] The purpose of the utility model is to provide a frame base locking cylinder and a bar rolling mill. The frame base locking cylinder can effectively reduce the radial offset load on the piston rod and the piston, and even eliminate the radial offset load, which is beneficial to ensure the sealing inside the cylinder body and extend the service life of the locking cylinder.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A bar rolling mill frame base locking oil cylinder comprises: a cylinder body, a piston, a piston rod and a locking rod; the cylinder body has an accommodating chamber, the locking rod, the piston rod and the piston are coaxially arranged and sequentially connected along the extension direction of the axis of the accommodating chamber, the piston and the piston rod are arranged in the accommodating chamber, one end of the locking rod extends into the accommodating chamber and is connected to the piston rod, and the other end is located outside the accommodating chamber; wherein,

[0007] The part of the accommodating chamber for accommodating the piston forms a piston chamber, and the part of the connection part for accommodating the piston rod and the locking rod forms a rotating chamber, and a gap is formed between the outer wall of the piston rod and the locking rod and the inner wall of the rotating chamber. When the piston, the piston rod and the locking rod are installed in the accommodating chamber, the piston chamber and the rotating chamber are isolated from each other; among the two ends of the locking rod and the piston rod connected to each other, one forms a first concave spherical surface, and the other forms a first convex spherical surface matching the first concave spherical surface, and the locking rod and the piston rod are in contact and matched through the first concave spherical surface and the first convex spherical surface, and the first concave spherical surface and the first convex spherical surface are slidably matched, so that the locking rod can be deflected relative to the piston rod, and the locking rod and the piston rod are locked in the direction of the axial center line of the accommodating chamber; the other end of the locking rod is formed with a pressing portion for pressing the frame base.

[0008] In the frame base locking cylinder of the above-mentioned bar rolling mill, for the sake of convenience, the end of the locking rod extending into the accommodating chamber is called the first end, and the end of the locking rod located outside the accommodating chamber is called the second end. Specifically, since the locking rod needs to apply downward pressure to the frame base to press the frame base, the first end of the locking rod with the pressing portion will be subjected to an upward force, and the locking rod will be subjected to a radial bias force. The upward force applied to the first end of the locking rod is relatively large. There is a matching tolerance between the locking rod and the accommodating chamber of the cylinder body, which causes the first end of the locking rod to deflect upward, and the second end of the locking rod is connected to the piston rod by a spherical structure. The first concave spherical surface and the first convex spherical surface can slide together, so that the first concave spherical surface and the first convex spherical surface can deflect relative to each other in the rotating chamber. As a result, The radial off-load force on the locking rod is hardly transmitted to the piston rod, reducing the radial off-load force on the piston rod, or even preventing the piston rod from being subjected to the radial off-load force, so that the axis line of the piston rod and the axis line of the cylinder cavity remain coincident, ensuring that the cylinder is not damaged, and ensuring that the seals and guides on the outer peripheral side of the piston rod and piston are not damaged by excessive extrusion, so that dust and impurities will not enter the cylinder, thereby ensuring that the matching surfaces of the piston rod and piston with the cylinder are not easily damaged, ensuring that the sealing life of the cylinder is extended, avoiding leakage inside and outside the cylinder, ensuring stable locking force, and extending the service life of the locking cylinder.

[0009] Therefore, in the locking oil cylinder of the frame base of the above-mentioned bar rolling mill, the radial offset load on the piston rod and the piston can be effectively reduced, or even eliminated, which is beneficial to ensuring the sealing inside the cylinder body and extending the service life of the locking oil cylinder.

[0010] Optionally, the locking rod is connected to the piston rod by a bolt; the piston rod and the piston have an integrated structure, a blind groove is provided on the side of the piston away from the piston rod, the blind groove is coaxially arranged with the piston, a part of the blind groove extends to the piston rod, the bottom of the blind groove has a through hole for the bolt to pass through, the through hole is coaxially arranged with the piston rod, and the diameter of the through hole is larger than the diameter of the bolt; a threaded hole is provided on the side of the locking rod facing the piston rod, the threaded hole is coaxially arranged with the locking rod; the bolt passes through the through hole and is connected with the threaded hole; a sealing cover for sealing the notch of the blind groove is provided on the side of the piston away from the piston rod.

[0011] Optionally, a spherical slider is provided between the nut of the bolt and the bottom surface of the blind groove, the bolt passes through the spherical slider, and the spherical slider is fixed to the nut, and one of the bottom surface of the blind groove and the surface of the spherical slider facing the bottom surface is formed with a second concave spherical surface, and the other is formed with a second convex spherical surface that cooperates with the second concave spherical surface, the bottom surface and the side of the spherical slider facing the bottom surface are in contact with each other through the second concave spherical surface and the second convex spherical surface, and the second concave spherical surface and the second convex spherical surface are slidably engaged.

[0012] Optionally, the bottom surface forms the second concave spherical surface, and the surface of the spherical slider facing the bottom surface forms the second convex spherical surface.

[0013] Optionally, the first concave spherical surface is formed on one end of the locking rod, and the first convex spherical surface is formed on one end of the piston rod facing the locking rod.

[0014] Optionally, a pad is provided on the end side of the piston rod facing the locking rod, the pad is fixed to the piston rod, the piston rod is in contact with the locking rod through the pad, and the side of the pad facing the locking rod is provided with the first convex spherical surface or the first concave spherical surface.

[0015] Optionally, the actual area of the first concave spherical surface and the first convex spherical surface when they cooperate with each other is greater than or equal to 65% of the relative area of the two;

[0016] The surface roughness of the first concave spherical surface is less than or equal to Ra1.6 μm, and the surface roughness of the first convex spherical surface is less than or equal to Ra1.6 μm;

[0017] A lubrication hole is provided in a portion of the cylinder side wall corresponding to the rotating chamber. The lubrication hole is communicated with the rotating chamber and is used to replenish lubricant into the rotating chamber.

[0018] Optionally, the locking oil cylinder further comprises a front end cover and a rear end cover, the front end cover being fixed to an end of the cylinder body corresponding to the locking rod, the locking rod passing through the front end cover, the rear end cover being fixed to an end of the cylinder body corresponding to the piston, and the rear end cover blocking an opening of the accommodating chamber at the end corresponding to the piston;

[0019] A guide sleeve is provided in the accommodating cavity at a position close to the front end cover, and the locking rod passes through the guide sleeve.

[0020] Optionally, an anti-rotation plate is provided between the front end cover and the locking rod, and the anti-rotation plate is used to limit the locking rod from rotating around its axis.

[0021] The present solution also provides a bar rolling mill, comprising a frame, a rolling roller and any one of the frame base locking cylinders provided by the above technical solution, wherein the frame comprises a frame base and a bracket fixed to the frame base, the rolling roller is mounted on the bracket for rolling bars, and the locking cylinders are respectively provided on two opposite sides of the frame base, and the locking rods of the locking cylinders are used to lock the frame base. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of this application are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of a locking cylinder in the prior art;

[0024] Figure 2 for Figure 1 Schematic diagram of force analysis when the piston rod of the middle locking cylinder is locked with the frame base;

[0025] Figure 3 A schematic cross-sectional view of a locking oil cylinder provided in an embodiment of the present utility model;

[0026] Figure 4 A schematic diagram of a state in which a locking cylinder is pressing a frame base provided by an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of the partial structure of a bar rolling mill assembly provided in an embodiment of the present utility model.

[0028] Icons: 031-cylinder body; 032-piston; 033-piston rod; 011-frame base; 1-frame; 2-roller; 3-locking cylinder; 11-frame base; 12-bracket; 31-cylinder body; 32-piston; 33-piston rod; 34-locking rod; 35-bolt; 36-spherical slider; 37-pad; 38-front cover; 39-rear cover; 311-accommodating chamber; 312-lubrication hole; 313-guide sleeve; 314-oil outlet hole; 381-anti-rotation clamping plate; 391-oil inlet hole; 3111-piston chamber; 3112-rotation chamber. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with examples. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompass such modifications and variations as come within the scope of the appended claims and their equivalents.

[0030] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] refer to Figure 3 、 Figure 4 and Figure 5As shown, the utility model provides a frame base locking cylinder for a bar rolling mill. In this embodiment, for ease of explanation, the locking cylinder is described in its installation position in application, wherein the axis of the accommodating chamber 311 in the cylinder body 31 is arranged parallel to the horizontal plane. Specifically, the frame base locking cylinder 3 of the bar rolling mill in this embodiment includes: a cylinder body 31, a piston 32, a piston rod 33 and a locking rod 34; the cylinder body 31 has an accommodating chamber 311, the locking rod 34, the piston rod 33 and the piston 32 are coaxially arranged and connected in sequence along the extension direction of the axis of the accommodating chamber 311, the piston 32 and the piston rod 33 are arranged in the accommodating chamber 311, the piston 32 and the piston rod 33 are fixedly connected, one end of the locking rod 34 extends into the accommodating chamber 311 and is connected to the piston rod 33, and the other end is located in the accommodating chamber 311. The piston 32, the piston rod 33 and the locking rod 34 can move back and forth in the accommodating chamber 311 along the extension direction of the axis of the accommodating chamber 311 and within a certain stroke. The portion of the accommodating chamber 311 used to accommodate the piston 32 forms a piston chamber 3111, and the portion used to accommodate the connection between the piston rod 33 and the locking rod 34 forms a rotating chamber 3112. A gap is formed between the outer wall of the piston rod 33 and the locking rod 34 and the inner wall of the rotating chamber 3112. When the piston 32, the piston rod 33 and the locking rod 34 are in the accommodating chamber 311, the piston 32, the piston rod 33 and the locking rod 34 can move back and forth in the accommodating chamber 311. When the rod 34 is installed in the accommodating chamber 311, the piston chamber 3111 and the rotating chamber 3112 are isolated from each other; in addition, one of the two ends of the locking rod 34 and the piston rod 33 connected to each other forms a first concave spherical surface, and the other forms a first convex spherical surface that cooperates with the first concave spherical surface. The locking rod 34 and the piston rod 33 are in contact and cooperate with each other through the first concave spherical surface and the first convex spherical surface, and the first concave spherical surface and the first convex spherical surface slide together, so that the locking rod 34 can be deflected relative to the piston rod 33, and the locking rod 34 and the piston rod 33 are in contact and cooperate with each other through the first concave spherical surface and the first convex spherical surface. The plug rod 33 is locked in the direction of the axial centerline of the accommodating chamber 311, so that the piston 32 and the piston rod 33 pull the locking rod 34 to move in the accommodating chamber 311; the other end of the locking rod 34 is formed with a pressing portion for pressing the frame base 11, and the pressing portion is an inclined surface structure below the end of the locking rod 34. When the locking rod 34 is extended forward, the pressing portion of the locking rod 34 can contact the pressed frame base 11 and apply downward pressure to the frame base 11, pressing the frame base 11 so that the frame base 11 cannot move upward.

[0032] When the frame base needs to be compressed, the piston in the driving cylinder pushes the piston rod to move forward, and the piston rod pushes the locking rod to extend and move forward, and the pressing part of the locking rod approaches the frame base until it contacts the frame base; after the pressing part contacts the frame base, the piston continues to move forward slowly, and the pressing part of the locking rod gradually presses the frame base. At the same time, as the pressure of the pressing part on the frame increases, the first concave spherical surface and the first convex spherical surface slide and deflect relative to each other, and the piston rod continues to move forward, and the pressing part of the locking rod moves forward and deflects upward at the same time until the preset clamping force is reached, and the piston stops moving. At this time, the pressing part of the locking rod locks the frame base.

[0033] In the above-mentioned bar rolling mill frame locking cylinder, for the sake of convenience, the end of the locking rod 34 extending into the accommodating chamber 311 is called the first end, and the end of the locking rod 34 located outside the accommodating chamber 311 is called the second end. Specifically, since the locking rod 34 needs to apply downward pressure to the frame base 11 to press the frame base 11, the first end of the locking rod 34 with the pressing portion will be subjected to an upward force, and the locking rod 34 will be subjected to a radial bias force. The first end of the locking rod 34 is subjected to a relatively large upward force. There is a matching tolerance between the locking rod 34 and the accommodating chamber 311 of the cylinder body 31, so that the first end of the locking rod 34 deflects upward, and the second end of the locking rod 34 is connected to the piston rod 33 by a spherical structure. The first concave spherical surface and the first convex spherical surface can slide together, so that the first concave spherical surface and the first convex spherical surface can deflect relative to each other in the rotating chamber 3112. As a result, The radial offset force on the locking rod 34 is hardly transmitted to the piston rod 33, reducing the radial offset force on the piston rod 33, or even preventing it from being subjected to the radial offset force, so that the axis of the piston rod 33 and the axis of the inner cavity 311 of the cylinder body 31 remain coincident, ensuring that the cylinder body 31 is not damaged, and ensuring that the seals and guides on the outer peripheral sides of the piston rod 33 and the piston 32 are not damaged by excessive squeezing, so that dust and impurities will not enter the cylinder body 31, thereby ensuring that the matching surfaces of the piston rod 33 and the piston 32 with the cylinder body 31 are not easily damaged, ensuring that the sealing life of the cylinder body 31 is extended, avoiding leakage inside and outside the cylinder, ensuring the stability of the locking force, and extending the service life of the locking cylinder 3.

[0034] Therefore, the frame base locking cylinder of the above-mentioned bar rolling mill can effectively reduce the radial offset load on the piston rod and piston when pressing the frame base, or even eliminate the radial offset load, which is beneficial to ensure the sealing inside the cylinder body and extend the service life of the locking cylinder.

[0035] In one possible implementation, Figure 3As shown, the locking rod 34 is connected to the piston rod 33 by a bolt 35; the piston rod 33 and the piston 32 have an integrated structure, and a blind groove is provided on the side of the piston 32 away from the piston rod 33. The blind groove is coaxially arranged with the piston 32, and a part of the blind groove extends to the piston rod 33. The bottom of the blind groove has a through hole for the bolt 35 to pass through. The through hole is coaxially arranged with the piston rod 33, and the diameter of the through hole is larger than the diameter of the bolt 35, so that a certain gap is formed between the inner wall of the through hole and the outer wall of the bolt 35. When the locking rod 34 deflects relative to the piston rod 33, the inner wall of the through hole and the bolt 35 are prevented from interfering. The locking rod 34 and the piston rod 33 are conveniently and reliably locked together.

[0036] Furthermore, if Figure 3 As shown, a spherical slider 36 is provided between the nut of the bolt 35 and the bottom surface of the blind groove. The bolt 35 passes through the spherical slider 36, which is fixed to the nut. One of the bottom surface of the blind groove and the surface of the spherical slider 36 facing the bottom surface has a second concave spherical surface, and the other has a second convex spherical surface that mates with the second concave spherical surface. The bottom surface and the side of the spherical slider 36 facing the bottom surface contact and mate via the second concave spherical surface and the second convex spherical surface, and the second concave spherical surface and the second convex spherical surface slide in engagement. The second concave spherical surface is provided at one end of the nut of the bolt 35 to mate with the second convex spherical surface, better coordinating the sliding between the first concave spherical surface and the first convex spherical surface, allowing for smoother deflection of the locking rod 34.

[0037] Among them, in order to prevent the bolt from loosening, a spring washer is provided on the side of the nut of the bolt 35 facing the through hole to prevent loosening. During actual installation and fixation, a high-strength bolt is used, and a small amount of tightening glue is applied to the thread of the bolt to prevent loosening. After the bolt 35 is tightened in place, it can be loosened by 1 / 4 turn, so that a little gap is reserved between the first concave spherical surface and the first convex spherical surface, and a little gap is reserved between the second concave spherical surface and the second convex spherical surface, which is conducive to the deflection of the locking rod 34 and will not cause the piston rod 33 to deflect due to overtightening.

[0038] As a specific embodiment, for example, in the above-mentioned locking cylinder, the bottom surface of the blind groove is formed to form a second concave spherical surface, and the surface of the spherical slider facing the bottom side forms a second convex spherical surface, which is beneficial to improve the connection stability.

[0039] On the basis of the above locking cylinder, Figure 3 As shown, one end of the locking rod 34 is formed with a first concave spherical surface, and the end of the piston rod 33 facing the locking rod 34 is formed with a first convex spherical surface. This is beneficial to the stability of the piston rod 33 when pushing the locking rod 34.

[0040] For the specific setting of the connection between the piston rod and the locking rod, such as Figure 3 As shown, a pad 37 can be provided on the end side of the piston rod 33 facing the locking rod 34. The pad 37 is fixed to the piston rod 33. A groove is provided on the end surface of the piston rod 33 facing the locking rod 34. The pad 37 is embedded in the groove and fixedly connected to the groove. The piston rod 33 contacts and cooperates with the locking rod 34 through the pad 37. The side of the pad 37 facing the locking rod 34 is provided with a first convex spherical surface or a first concave spherical surface, which cooperates with the connecting end of the locking rod 34. The piston rod 33 and the pad 37 are both made of 45 steel with a modulated hardness of 22-32 HRC. The surface hardening hardness of the pad 37 facing the locking rod 34 is 55-60 HRC, and the surface hardening hardness of the locking rod 34 facing the pad 37 is 55-60 HRC.

[0041] On the other hand, in one possible implementation, referring to Figure 3 As shown, in order to ensure that the first concave spherical surface and the first convex spherical surface have sufficient contact areas to ensure connection stability, the actual area of the first concave spherical surface and the first convex spherical surface when they cooperate with each other is greater than or equal to 65% of the relative area of the two; and the surface roughness of the first concave spherical surface is less than or equal to Ra1.6μm, and the surface roughness of the first convex spherical surface is less than or equal to Ra1.6μm, so that the sliding fit between the two is good; a lubrication hole 312 is provided at the position of the side wall of the cylinder body 31 corresponding to the rotating chamber 3112, and the lubrication hole 312 is connected to the rotating chamber 3112, and the lubrication hole 312 is used to replenish lubricant into the rotating chamber 3112, and lubricant, such as grease, is regularly replenished from the lubrication hole 312 to the rotating chamber 3112, so that the first concave spherical surface and the first convex spherical surface are fully lubricated to ensure good sliding fit.

[0042] In addition, Figure 3As shown, the locking cylinder further includes a front end cover 38 and a rear end cover 39. The front end cover 38 is fixed to the end of the cylinder body 31 corresponding to the locking rod 34. The locking rod 34 passes through the front end cover 38. The rear end cover 39 is fixed to the end of the cylinder body 31 corresponding to the piston 32. The rear end cover 39 blocks the opening of the accommodating chamber 311 at the end corresponding to the piston 32. A guide sleeve 313 is provided in the accommodating chamber 311 near the front end cover 38. The locking rod 34 passes through the guide sleeve 313 and is slidably connected to the inner hole of the guide sleeve 313. A dust ring is provided in the inner hole of the guide sleeve 313 near the front end cover 38 to provide sealing and dustproof functions. A shaft seal and a guide belt are provided on the inner wall of the accommodating chamber 311 near the piston chamber 3111. Two support rings are provided on the outer peripheral side of the piston 32. The two support rings are arranged at intervals in the extension direction of the axial center line of the piston 32. A piston 32 sealing ring is also provided on the outer peripheral side of the piston 32. The piston 32 sealing ring is located between the two support rings.

[0043] Exemplary, reference Figure 3 As shown, an oil inlet hole 391 is provided on the rear end cover 39, and the oil inlet hole 391 is connected to the piston chamber 3111. An oil outlet hole 314 is provided on the side wall of the piston chamber 3111 away from the rear end cover 39, and the oil outlet hole 314 is connected to the piston chamber 3111.

[0044] In order to enhance the stability of the locking rod pressing on the rack base, Figure 3 As shown, an anti-rotation plate 381 is provided between the front end cover 38 and the locking rod 34 . The anti-rotation plate 381 is used to limit the locking rod 34 from rotating around its axis, so that the locking rod 34 can lock the frame base 11 more stably.

[0045] Under the same design concept, Figure 3 and Figure 5 As shown, this embodiment also provides a bar rolling mill, including a frame 1, a rolling roller 2 and any one of the locking cylinders 3 provided in the above embodiments. The frame 1 includes a frame base 11 and a bracket 12 fixed on the frame base 11. The rolling roller 2 is installed on the bracket 12 for rolling bars. Locking cylinders 3 are respectively provided on opposite sides of the frame base 11. The cylinder body 31 of the locking cylinder 3 is fixed to the frame base 11 through the cylinder base. The locking rod 34 of the locking cylinder 3 is used to lock the frame base 11. A pressure surface is provided on the outer side of the frame base 11. The pressure surface can be an inclined surface. The pressing part of the locking rod 34 has an inclined pressing surface that contacts and cooperates with the pressure surface. A wear-resistant pad is provided on the pressing surface to ensure that the pressing part is not worn.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A frame base locking cylinder for a bar rolling mill, characterized in that: include: Cylinder body, piston, piston rod and locking rod; the cylinder body is provided with an accommodating chamber, the locking rod, the piston rod and the piston are coaxially arranged and connected in sequence along the extension direction of the axial center line of the accommodating chamber, the piston and the piston rod are arranged in the accommodating chamber, one end of the locking rod extends into the accommodating chamber and is connected to the piston rod, and the other end is located outside the accommodating chamber; wherein, the part of the accommodating chamber for accommodating the piston forms a piston chamber, and the part for accommodating the connection part of the piston rod and the locking rod forms a rotating chamber, and a gap is formed between the outer wall of the piston rod and the locking rod and the inner wall of the rotating chamber. When the piston, the piston rod and the locking rod are When the locking rod is installed in the accommodating chamber, the piston chamber and the rotating chamber are isolated from each other; of the two ends of the locking rod connected to the piston rod, one forms a first concave spherical surface, and the other forms a first convex spherical surface that cooperates with the first concave spherical surface, the locking rod and the piston rod are in contact and cooperate with each other through the first concave spherical surface and the first convex spherical surface, and the first concave spherical surface and the first convex spherical surface are slidably cooperated, so that the locking rod can be deflected relative to the piston rod, and the locking rod and the piston rod are locked in the direction of the axial center line of the accommodating chamber; the other end of the locking rod is formed with a pressing portion for pressing the frame base.

2. The frame base locking cylinder of the bar rolling mill according to claim 1, characterized in that: The locking rod is connected to the piston rod by a bolt; the piston rod and the piston have an integrated structure, a blind groove is provided on the side of the piston away from the piston rod, the blind groove is coaxially arranged with the piston, a part of the blind groove extends to the piston rod, the bottom of the blind groove has a through hole for the bolt to pass through, the through hole is coaxially arranged with the piston rod, and the diameter of the through hole is larger than the diameter of the bolt; a threaded hole is provided on the side of the locking rod facing the piston rod, the threaded hole is coaxially arranged with the locking rod; the bolt passes through the through hole and is connected with the threaded hole; a sealing cover for sealing the notch of the blind groove is provided on the side of the piston away from the piston rod.

3. The frame base locking cylinder of the bar rolling mill according to claim 2, characterized in that: A spherical slider is provided between the nut of the bolt and the bottom surface of the blind groove, the bolt passes through the spherical slider, and the spherical slider is fixed to the nut. One of the bottom surface of the blind groove and the surface of the spherical slider facing the bottom surface is formed with a second concave spherical surface, and the other is formed with a second convex spherical surface that cooperates with the second concave spherical surface. The bottom surface and the side of the spherical slider facing the bottom surface are in contact with each other through the second concave spherical surface and the second convex spherical surface, and the second concave spherical surface and the second convex spherical surface are slidably engaged.

4. The frame base locking cylinder of the bar rolling mill according to claim 3, characterized in that: The bottom surface forms the second concave spherical surface, and the surface of the spherical slider facing the bottom surface forms the second convex spherical surface.

5. The frame base locking cylinder of the bar rolling mill according to any one of claims 1 to 4, characterized in that: The first concave spherical surface is formed at one end of the locking rod, and the first convex spherical surface is formed at one end of the piston rod facing the locking rod.

6. The frame base locking cylinder of the bar rolling mill according to any one of claims 1 to 4, characterized in that: A pad is provided on the end side of the piston rod facing the locking rod, and the pad is fixed to the piston rod. The piston rod is in contact with the locking rod through the pad, and the side of the pad facing the locking rod is provided with the first convex spherical surface or the first concave spherical surface.

7. The frame base locking cylinder of the bar rolling mill according to any one of claims 1 to 4, characterized in that: The actual area of the first concave spherical surface and the first convex spherical surface when they are matched with each other is greater than or equal to 65% of the relative area of the two; The surface roughness of the first concave spherical surface is less than or equal to Ra1.6 μm, and the surface roughness of the first convex spherical surface is less than or equal to Ra1.6 μm; A lubrication hole is provided in a portion of the cylinder side wall corresponding to the rotating chamber. The lubrication hole is communicated with the rotating chamber and is used to replenish lubricant into the rotating chamber.

8. The frame base locking cylinder of the bar rolling mill according to claim 1, characterized in that: It also includes a front end cover and a rear end cover, the front end cover is fixed to the end of the cylinder body corresponding to the locking rod, the locking rod passes through the front end cover, the rear end cover is fixed to the end of the cylinder body corresponding to the piston, and the rear end cover blocks the opening of the accommodating chamber at the end corresponding to the piston; a guide sleeve is provided in the accommodating chamber near the front end cover, and the locking rod passes through the guide sleeve.

9. The frame base locking cylinder of the bar rolling mill according to claim 8, characterized in that: An anti-rotation card plate is provided between the front end cover and the locking rod, and the anti-rotation card plate is used to limit the locking rod from rotating around its axis.

10. A bar rolling mill, characterized in that: It comprises a frame, a rolling roller and a frame base locking cylinder as described in any one of claims 1 to 8, wherein the frame comprises a frame base and a bracket fixed to the frame base, the rolling roller is mounted on the bracket for rolling bars, and the locking cylinders are respectively provided on opposite sides of the frame base, and the locking rods of the locking cylinders are used to lock the frame base.

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