Workover rig brake oil cylinder capable of conveniently adjusting brake clearance

Abstract

The utility model belongs to the technical field of oil cylinders, and particularly relates to a workover rig brake oil cylinder convenient for adjusting a brake clearance, which comprises a cylinder barrel, a cylinder cover, a piston and a piston rod, the piston is arranged in the cylinder barrel, the piston is connected with the piston rod, and the cylinder cover is connected with the cylinder barrel. The outer cylinder sleeve is connected to the outer side of the inner cylinder barrel through threads, the outer cylinder sleeve comprises an outer cylinder barrel, a lug plate seat, an end sealing plate and a check ring, one end of the outer cylinder barrel is connected with the end sealing plate through a screw, and the check ring is arranged between the lug plate seat and the outer cylinder barrel; the piston and the piston rod are of an integrated structure, and a disc spring set is arranged between the inner cylinder barrel and the piston. The first connecting ring lug and the second connecting ring lug are connected with a workover rig brake mechanism through connecting pieces respectively. The utility model has the advantages that the cylinder barrel with a combined structure is adopted, so that the length of the cylinder barrel can be telescopically adjusted within a small range in the operation process, and the problem that the brake clearance is inconvenient to adjust in the application process is solved.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinder technology, and in particular relates to a workover rig brake cylinder that facilitates adjustment of brake clearance. Background Technology

[0002] Well workover rigs and well cleaning rigs are the most basic and essential power sources for well workover and downhole operations. They are classified into tracked and wheeled types based on their operating structure. With the development of the machinery industry, traditional diesel-powered well workover rigs have been gradually replaced by hydraulic environmentally friendly energy-storage well workover rigs. Compared to conventional well workover rigs, hydraulic environmentally friendly energy-storage well workover rigs have advantages such as energy efficiency, simple operation, safety, environmental friendliness, and convenient assembly and disassembly. Hydraulic environmentally friendly energy-storage well workover rigs use a hydraulic system instead of a mechanical system and an accumulator to recover energy. Therefore, the selection of the sealing system for the main power component of this hydraulic system, the hydraulic cylinder, is subject to very strict requirements. Improper seal selection or an unreasonable sealing structure can easily lead to leakage.

[0003] Chinese utility model patent application number 201720431487.8 discloses a workover rig cylinder, including a cylinder bottom and a cylinder barrel disposed on the cylinder bottom. A sleeve is provided inside the cylinder barrel, and a piston is fitted onto the sleeve. A piston rod is connected to the piston. A guide sleeve is threaded to the front end of the cylinder barrel. The front end of the piston rod fits inside the guide sleeve. The piston divides the interior of the cylinder barrel into a first rodless chamber, a second rodless chamber, and a rod chamber. Two sealing points are provided between the first rodless chamber, the second rodless chamber, and the rod chamber for sealing. Existing workover rig brake mechanisms lack adjustable clearance. When the distance between the two connecting lugs of the brake cylinder needs adjustment, it can only be adjusted by completely disassembling and loosening one end of the cylinder. This is inconvenient in the operation and application of workover rigs and requires further improvement. Utility Model Content

[0004] The purpose of this invention is to provide a workover rig brake cylinder that facilitates adjustment of the brake clearance, overcoming the shortcomings of the prior art. It adopts a combined cylinder structure, allowing the cylinder length to be adjusted within a small range during operation, adapting to changes in the brake clearance of the workover rig brake mechanism, and solving the problem of inconvenient brake clearance adjustment in application.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A workover rig brake cylinder for convenient adjustment of brake clearance includes a cylinder barrel, a cylinder head, a piston, and a piston rod. The piston is disposed inside the cylinder barrel and connected to the piston rod. The cylinder head is connected to the cylinder barrel. The cylinder barrel is a combined structure, including an inner cylinder barrel and an outer cylinder sleeve. The outer cylinder sleeve is threaded to the outside of the inner cylinder barrel. The outer cylinder sleeve is also a combined structure, including an outer cylinder barrel, a lug seat, an end seal plate, and a retaining ring. One end of the outer cylinder barrel is connected to the end seal plate by a screw. An annular retaining ring is provided between the lug seat and the outer cylinder barrel. The piston and piston rod are a single unit. The piston has a one-piece structure with a sealing ring between the outer circumference of the piston and the inner wall of the inner cylinder. A guide sleeve 1 is provided between the inner end of the piston rod and the inner cylinder, and a guide sleeve 2 is provided between the outer end of the piston rod and the cylinder head. A disc spring assembly is provided between the inner cylinder and the piston. A connecting lug 1 is provided at the outer end of the piston rod, and a connecting lug 2 is provided on the outer side of the lug seat. The connecting lug 1 and the connecting lug 2 are respectively connected to the workover rig's brake mechanism via connecting parts. A hydraulic connector is provided on the connecting lug 1, and the hydraulic connector is connected to the pressurization chamber on one side of the piston via the inner flow channel of the piston rod.

[0007] Furthermore, a locking nut is provided on the outer side of the inner cylinder, and the locking nut abuts against the end side of the outer cylinder.

[0008] Furthermore, the disc spring assembly consists of two sets, each set consisting of two pairs of disc springs stacked and fastened together.

[0009] Furthermore, a ring washer is provided between the two sets of disc springs, and a ring washer is provided at the gap where the disc springs are engaged.

[0010] Furthermore, the ear plate seat is provided with a grease nipple, and the outlet of the grease nipple is connected to the gaps on both sides of the retaining ring via oil passages.

[0011] Furthermore, the ear plate seat is provided with a breathing hole, which is connected to the space where the disc spring assembly is located through an opening on the inner cylinder.

[0012] Furthermore, the outer cylinder and the locking nut are respectively provided with operating holes on their outer circular surfaces, and the operating holes are matched with crescent wrenches.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The cylinder adopts a combined structure, which allows the length of the cylinder to be adjusted within a small range during operation, so as to adapt to the changes in the brake clearance of the workover rig's braking mechanism and solve the problem of inconvenient adjustment and use in application.

[0015] The adoption of an integrated piston structure improves the piston's strength and significantly reduces the high costs and maintenance workload associated with conventional combined pistons during use and manufacturing, thereby enhancing the market competitiveness of workover rig brake cylinders. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the outer cylinder liner structure in an embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the disc spring assembly structure in an embodiment of this utility model.

[0019] In the diagram: 1-Cylinder barrel, 2-Cylinder head, 3-Piston, 4-Piston rod, 5-Inner cylinder barrel, 6-Outer cylinder liner, 7-Outer cylinder barrel, 8-Ear plate seat, 9-End sealing plate, 10-Retaining ring, 11-Sealing ring, 12-Guide sleeve one, 13-Guide sleeve two, 14-Disc spring assembly, 15-Connecting ring lug one, 16-Connecting ring lug two, 17-Hydraulic connector, 18-Locking nut, 19-Disc spring, 20-Ring washer one, 21-Ring washer two, 22-Grease nipple, 23-Breath hole, 24-Operating hole. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0022] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0023] See Figure 1-3This is a schematic diagram of an embodiment of a workover rig brake cylinder for convenient adjustment of brake clearance, comprising a cylinder barrel 1, a cylinder head 2, a piston 3, and a piston rod 4. The piston 3 is disposed inside the cylinder barrel 1 and connected to the piston rod 4. The cylinder head 2 is connected to the cylinder barrel 1. The cylinder barrel 1 is an independent assembly structure, including an inner cylinder barrel 5 and an outer cylinder sleeve 6. The outer cylinder sleeve 6 is threaded to the outside of the inner cylinder barrel 5. The outer cylinder sleeve 6 includes an outer cylinder barrel 7, an ear plate seat 8, an end sealing plate 9, and a retaining ring 10. One end of the outer cylinder barrel 7 is connected to the end sealing plate 9 by a screw. A retaining ring 10 is provided between the ear plate seat 8 and the outer cylinder barrel 7. The piston 3 and the piston rod 4 are an integral structure. A sealing ring 11 is provided between the outer periphery of the piston 3 and the inner wall of the inner cylinder barrel 5. A guide sleeve 12 is provided between the inner end of the piston rod 4 and the inner cylinder 5, and a guide sleeve 2 13 is provided between the outer end of the piston rod 4 and the cylinder head 2. A disc spring assembly 14 is provided between the inner cylinder 5 and the piston 3. A connecting ring lug 15 is provided at the outer end of the piston rod 4, and a connecting ring lug 2 16 is provided on the outer side of the lug seat 8. The connecting ring lug 15 and the connecting ring lug 2 16 are respectively connected to the workover rig brake mechanism via connecting parts. By adjusting the position of the outer cylinder sleeve 6 on the inner cylinder 5, the lug seat 8 and the outer cylinder 7 can be freely rotated, the distance between the two connecting ring lugs can be lengthened or shortened, and the brake clearance can be adjusted. A hydraulic connector 17 is provided on the connecting ring lug 15. The hydraulic connector 17 is connected to the pressurization chamber on one side of the piston 3 via the inner flow channel of the piston rod 4.

[0024] A locking nut 18 is also provided on the outer side of the inner cylinder 5. The locking nut 18 rests against the end side of the outer cylinder 7 to prevent the outer cylinder 7 from loosening and to lock it in place.

[0025] The disc spring assembly 14 consists of two sets, each set consisting of two pairs of disc springs 19 stacked and fastened together. A first ring washer 20 is provided between the two sets of disc springs 19, and a second ring washer 21 is provided at the gap where the disc springs 19 are fastened together. Both ring washer 20 and ring washer 21 are made of 304 stainless steel, which makes the contact between the disc springs 19 more stable, ensuring reliable transmission of the disc spring compression force. Simultaneously, the preload of the disc spring assembly is adjusted according to calculations to keep the device operating within the safe adjustment range of the disc spring assembly.

[0026] The ear plate seat 8 is equipped with a grease nipple 22. The outlet of the grease nipple 22 is connected to the gaps on both sides of the retaining ring 10 through the oil passage. Grease is injected into the grease nipple 22 to provide lubrication for the relative rotation between the outer cylinder 7 and the ear plate seat 8, reducing the friction during adjustment.

[0027] The ear plate seat 8 is provided with a vent 23, which is connected to the space where the disc spring assembly 14 is located through the opening on the inner cylinder 5, so as to achieve pressure balance in the space where the disc spring assembly 14 is located.

[0028] Operating holes 24 are provided on the outer circular surfaces of the outer cylinder 7 and the locking nut 18 respectively. The operating holes 24 are matched with crescent wrenches, so that the length of the cylinder can be adjusted within a small range during operation to adapt to the gap changes of the workover rig's braking mechanism, complete the adjustment of the rapid braking gap, and solve the problem of inconvenient adjustment in application.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A workover rig brake cylinder for convenient adjustment of brake clearance, comprising a cylinder barrel, a cylinder head, a piston, and a piston rod, wherein the piston is disposed inside the cylinder barrel, the piston is connected to the piston rod, and the cylinder head is connected to the cylinder barrel, characterized in that: The cylinder is a combined structure, including an inner cylinder and an outer cylinder sleeve. The outer cylinder sleeve is connected to the outside of the inner cylinder by threads. The outer cylinder sleeve is a combined structure, including an outer cylinder, an ear plate seat, an end sealing plate and a retaining ring. One end of the outer cylinder is connected to the end sealing plate by screws. An annular retaining ring is provided between the ear plate seat and the outer cylinder. The piston and piston rod are an integral structure. A sealing ring is provided between the outer periphery of the piston and the inner wall of the inner cylinder. A guide sleeve is provided between the inner end of the piston rod and the inner cylinder. A guide sleeve is provided between the outer end of the piston rod and the cylinder head. A disc spring assembly is provided between the inner cylinder and the piston. The piston rod has a connecting lug 1 at its outer end and a connecting lug 2 on the outer side of the lug seat. The connecting lug 1 and the connecting lug 2 are respectively connected to the workover machine brake mechanism via connecting parts. The connecting lug 1 is equipped with a hydraulic connector, which is connected to the pressurization chamber on one side of the piston via the piston rod's internal flow channel.

2. The workover rig brake cylinder for convenient adjustment of brake clearance as described in claim 1, characterized in that, A locking nut is also provided on the outer side of the inner cylinder, and the locking nut abuts against the end side of the outer cylinder.

3. A workover rig brake cylinder for convenient adjustment of brake clearance as described in claim 1, characterized in that, The disc spring assembly consists of two sets, each set consisting of two pairs of disc springs stacked and fastened together.

4. A workover rig brake cylinder for convenient adjustment of brake clearance as described in claim 3, characterized in that, A ring washer is provided between the two sets of disc springs, and a ring washer is provided at the gap where the disc springs are fastened.

5. A workover rig brake cylinder for convenient adjustment of brake clearance as described in claim 1, characterized in that, The ear plate seat is equipped with a grease nipple, and the outlet of the grease nipple is connected to the gaps on both sides of the retaining ring via oil passages.

6. A workover rig brake cylinder for convenient adjustment of brake clearance as described in claim 1, characterized in that, The ear plate seat is provided with a breathing hole, which is connected to the space where the disc spring assembly is located through an opening on the inner cylinder.

7. A workover rig brake cylinder for convenient adjustment of brake clearance as described in claim 2, characterized in that, The outer cylinder and the locking nut are respectively provided with operating holes on their outer circular surfaces, and the operating holes are matched with crescent wrenches.

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