Locking cylinder of rolling mill

Abstract

The utility model relates to a rolling mill locking cylinder which comprises a cylinder barrel and a piston rod which are connected in a sliding mode, the piston rod comprises a middle outer diameter section located at the rear end of the cylinder barrel, a large outer diameter section attached to the inner wall of the rear end of the cylinder barrel and a small outer diameter section at the front end of the cylinder barrel, and a rear end gap is reserved between the middle outer diameter section and the inner wall of the rear end of the cylinder barrel. The rear end of the cylinder barrel is connected with a rear cover, the rear cover comprises a flange plate portion abutting against the rear end face of the cylinder barrel and a flange neck portion inserted into the rear end gap, a rear cavity is formed between the flange neck portion and the large-outer-diameter section, a front cavity is formed between the large-outer-diameter section and the inner end face of the cylinder barrel, and the front end of the cylinder barrel is connected with a front cover. A plurality of stacked belleville springs are connected to the guide rod in a sleeved mode, a first oil channel communicated with the rear cavity and a second oil channel communicated with the front cavity are formed in the outer wall of the cylinder barrel, disassembly during maintenance is facilitated, abrasion of the cylinder body is reduced, the service life of the locking cylinder is prolonged, and the locking cylinder is suitable for industrial production and has high practicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of locking cylinder, especially relates to a rolling mill locking cylinder. BACKGROUND

[0002] In the existing Chinese patent database, a patent named a rolling mill locking cylinder with an internal through rear oil port is disclosed, the application number is CN202221060184.7, the application date is May 6, 2022, a rolling mill locking cylinder with an internal through rear oil port relates to the structure of a hydraulic oil cylinder on a high-speed rolling mill in a steel plant, which comprises a cylinder barrel, a piston rod, a first rear end cover and a second rear end cover, the piston rod separates the cylinder barrel into a rod cavity and a rodless cavity; the piston rod is provided with an inner cavity, the rear end of the inner cavity is an open end and is connected with the rodless cavity, the front end of the inner cavity is a blind end, and the front end of the inner cavity is stepped after diameter change; a guide rod is connected to the second rear end cover, the guide rod is arranged in the inner cavity of the piston rod, a plurality of disc springs are arranged between the step in the piston rod and the second rear end cover, and the plurality of disc springs are sleeved on the guide rod; an oil channel connected with the rod cavity is arranged on the cylinder barrel, a stainless steel connector is connected to the first rear end cover, and the stainless steel connector is connected with the oil channel after penetrating through the first rear end cover and the second rear end cover. The utility model separates the oil port and the sealing ring from the rack sleeve of the rolling mill, avoids the adverse effects of the vibration, impact and water mist of the rack on the oil port and the sealing ring, that is, avoids oil leakage of the oil port.

[0003] The piston rod of the rolling mill cannot be normally extended after the disc spring fails in the prior art, so that the rolling roller cannot be fixed at the actual working position. The present application aims to provide a rolling mill locking cylinder which can lock the rolling roller through hydraulic oil when the disc spring fails and is convenient to maintain and disassemble. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is how to continue to maintain the normal work of the piston rod in the rolling mill after the disc spring fails. In order to improve the shortcomings, the utility model provides a rolling mill locking cylinder.

[0005] To achieve the above purpose, the utility model is implemented by the following technical scheme:

[0006] A rolling mill locking cylinder, comprising a cylinder and a piston rod connected slidingly, the piston rod comprising a middle outer diameter section at the rear end of the cylinder, a large outer diameter section abutting the inner wall of the rear end of the cylinder, and a small outer diameter section at the front end of the cylinder, a rear end gap being left between the middle outer diameter section and the inner wall of the rear end of the cylinder, the rear end of the cylinder being connected with a rear cover, the rear cover comprising a flange plate portion abutting the rear end face of the cylinder and a flange neck portion inserted into the rear end gap, a rear cavity being provided between the flange neck portion and the large outer diameter section, a front cavity being provided between the large outer diameter section and the inner end face of the cylinder, the front end of the cylinder being connected with a front cover, a front end gap being provided between the small outer diameter section and the inner wall of the front end of the cylinder, a support sleeve being provided in the front end gap, the inner end face of the front cover abutting the outer end face of the support sleeve, a guide rod being provided in the piston rod, a plurality of stacked butterfly springs being sleeved on the guide rod, a first oil channel being provided on the outer wall of the cylinder and communicated with the rear cavity, and a second oil channel being provided on the outer wall of the cylinder and communicated with the front cavity.

[0007] Compared with the prior art, the utility model has the advantages that: the cooperation between the cylinder, the rear cover and the piston rod forms a rear cavity between the rear cover and the cylinder, as an emergency mode, when the butterfly springs fail, oil can be injected into the rear cavity through the first oil channel, the position of the hydraulic oil locks the position of the rolling roller in the rolling mill, the device is convenient to disassemble during maintenance, reduces the wear of the cylinder and prolongs the service life of the locking cylinder, and the device is suitable for industrial production and has strong practicability.

[0008] As a preferred scheme, a pressing piece is sleeved on the guide rod, the pressing piece abutting the inner end face of the flange plate portion of the rear cover, one end of the butterfly spring abutting the end face of the pressing piece and the other end abutting the bottom face of the inner cavity of the piston rod.

[0009] As a preferred scheme, a sealing groove is provided on the outer surface of the large outer diameter section and the middle outer diameter section, and a sealing ring is embedded in the sealing groove.

[0010] As a preferred scheme, a lubricating oil channel is provided on the outer wall of the cylinder and communicated with the support sleeve.

[0011] As a preferred scheme, two tapered oil port connectors are provided on the end face of the rear cover, one of the tapered oil port connectors being communicated with the first oil channel and the other being communicated with the second oil channel. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The figure is a structural schematic diagram of the utility model.

[0013] In the diagram: 1. Cylinder barrel, 2. Piston rod, 201. Middle outer diameter section, 202. Large outer diameter section, 203. Small outer diameter section, 3. Rear end clearance, 4. Rear cover, 401. Flange section, 402. Flange neck, 5. Rear cavity, 6. Front cavity, 7. Front cover, 8. Front end clearance, 9. Support sleeve, 10. Guide rod, 11. Disc spring, 12. First oil passage, 13. Second oil passage, 14. Pressure plate, 15. Sealing groove, 16. Lubricating oil passage, 17. Conical oil port connector. Detailed Implementation

[0014] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, a rolling mill locking cylinder includes a cylinder 1 and a piston rod 2 that are slidably connected. The piston rod 2 includes a middle outer diameter section 201 located at the rear end of the cylinder 1, a large outer diameter section 202 that fits against the inner wall of the rear end of the cylinder 1, and a small outer diameter section 203 at the front end of the cylinder 1. A rear end gap 3 is left between the middle outer diameter section 201 and the inner wall of the rear end of the cylinder 1. A rear cover 4 is connected to the rear end of the cylinder 1. The rear cover 4 includes a flange portion 401 that abuts against the rear end face of the cylinder 1 and a flange neck 402 that is inserted into the rear end gap 3. The flange neck 402 and the large outer diameter section 203 are connected to the inner wall of the rear end of the cylinder 1. A rear cavity 5 is provided between the outer diameter sections 202 and the inner end face of the cylinder 1. A front cavity 6 is provided between the large outer diameter section 202 and the inner end face of the cylinder 1. A front cover 7 is connected to the front end of the cylinder 1. A front gap 8 is provided between the small outer diameter section 203 and the inner wall of the front end of the cylinder 1. A support sleeve 9 is provided in the front gap 8. The inner end face of the front cover 7 abuts against the outer end face of the support sleeve 9. A guide rod 10 is provided inside the piston rod 2. Several stacked butterfly springs 11 are sleeved on the guide rod 10. A first oil passage 12 communicating with the rear cavity 5 and a second oil passage 13 communicating with the front cavity 6 are respectively opened on the outer wall of the cylinder 1. A pressure plate 14 is sleeved on the guide rod 10. The pressure plate 14 abuts against the inner end face of the flange portion 401 of the rear cover 4. One end of the butterfly spring 11 abuts against the end face of the pressure plate 14, and the other end abuts against the bottom surface of the inner cavity of the piston rod 2. Sealing grooves 15 are formed on the outer surfaces of the large outer diameter section 202 and the medium outer diameter section 201, and sealing rings are embedded in the sealing grooves 15. Lubricating oil passages 16 are formed on the outer wall of the cylinder barrel 1, and the lubricating oil passages 16 are connected to the support sleeve 9. Two conical oil port connectors 17 are provided on the end face of the rear cover 4. One conical oil port connector 17 is connected to the first oil passage 12, and the other conical oil port connector 17 is connected to the second oil passage 13.

[0016] When the rolling mill is working, the locking oil cylinder extends the piston rod 2 by the action of the butterfly spring 11, and fixes the roll in the actual working position. The rear cover 4 of the oil cylinder is designed in a flange shape, and forms the effect of a positioning spacer. The purpose is to inject hydraulic oil into the rear cavity 5 through the first oil channel 12 when the butterfly spring 11 fails, so as to maintain the locking of the rolling mill. When the roll needs to be replaced, hydraulic oil is injected into the front cavity 6 through the second oil channel 13, the butterfly spring 11 is compressed by pressure, the piston rod 2 is retracted, and the replacement of the roll is completed.

[0017] The utility model is not limited to the above-mentioned embodiment, on the basis of the technical scheme disclosed in the utility model, the skilled in the art can make some replacement and deformation to some technical features in the disclosed technical content without creative labor, and these replacement and deformation are all within the protection scope of the utility model.

Claims

1. A mill locking cylinder, characterized by: The application relates to a cylinder-piston rod assembly with a sliding connection, which comprises a cylinder (1) and a piston rod (2), wherein the piston rod (2) comprises a middle outer diameter section (201) located at the rear end of the cylinder (1), a large outer diameter section (202) abutting the inner wall of the rear end of the cylinder (1), and a small outer diameter section (203) at the front end of the cylinder (1), a rear end gap (3) is left between the middle outer diameter section (201) and the inner wall of the rear end of the cylinder (1), a rear cover (4) is connected to the rear end of the cylinder (1), the rear cover (4) comprises a flange plate part (401) abutting the rear end face of the cylinder (1) and a flange neck part (402) inserted into the rear end gap (3), a rear cavity (5) is arranged between the flange neck part (402) and the large outer diameter section (202), a front cavity (6) is arranged between the large outer diameter section (202) and the inner end face of the cylinder (1), a front cover (7) is connected to the front end of the cylinder (1), a front end gap (8) is arranged between the small outer diameter section (203) and the inner wall of the front end of the cylinder (1), a support sleeve (9) is arranged in the front end gap (8), the inner end face of the front cover (7) abuts the outer end face of the support sleeve (9), a guide rod (10) is arranged in the piston rod (2), a plurality of stacked butterfly springs (11) are sleeved on the guide rod (10), a first oil channel (12) communicating with the rear cavity (5) and a second oil channel (13) communicating with the front cavity (6) are respectively formed in the outer wall of the cylinder (1).

2. A mill locking cylinder according to claim 1, characterized in that: A pressing plate (14) is sleeved on the guide rod (10) and abuts the inner end face of the flange plate part (401) of the rear cover (4), one end of the butterfly spring (11) abuts the end face of the pressing plate (14) and the other end abuts the bottom face of the inner cavity of the piston rod (2).

3. A mill locking cylinder according to claim 2, characterized in that: Sealing grooves (15) are formed in the outer surfaces of the large outer diameter section (202) and the middle outer diameter section (201), and sealing rings are embedded in the sealing grooves (15).

4. A mill locking cylinder according to claim 3, characterized in that: A lubricating oil channel (16) is formed in the outer wall of the cylinder (1) and communicates with the support sleeve (9).

5. A mill locking cylinder according to any one of claims 1-4, characterized in that: Two tapered oil port connectors (17) are arranged on the end face of the rear cover (4), one of the tapered oil port connectors (17) communicates with the first oil channel (12) and the other tapered oil port connector (17) communicates with the second oil channel (13).

Images