Oil cylinder type hydraulic chuck

Abstract

The utility model belongs to the field of coal mine roadway tunneling face drilling, and relates to an oil cylinder type hydraulic chuck which comprises a chuck shell, a main end cover, two side end covers, two slips, two piston rods, a first bolt, a first gasket, a second bolt, a second gasket, a first sealing ring and a second sealing ring. Compared with a traditional chuck, the chuck has the advantages of being simple in structure and reasonable in design, and complexity and maintenance difficulty of equipment are greatly simplified. And meanwhile, the dismounting efficiency is extremely high, the slip replacement process can be completed only through simple operation without the help of a complex tool, and the construction efficiency of the drilling machine is greatly improved. In addition, the oil cylinder type hydraulic chuck further adopts a double oil leakage prevention structure, the stability and the sealing performance of an oil way system are effectively ensured, damage to equipment caused by hydraulic oil leakage is avoided, and the oil cylinder type hydraulic chuck is high in reliability, long in service life and capable of stably working in a severe underground coal mine environment for a long time. Therefore, the utility model is suitable for the field of coal mine tunnel driving face drilling, and provides efficient and reliable drilling equipment selection for coal mining.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the coal mine roadway driving face drilling field relates to an oil cylinder type hydraulic chuck. BACKGROUND

[0002] The chuck of the coal mine underground drilling machine is an important component of the power head, which functions to clamp the drill rod and provide torque and axial force. The commonly used chuck is basically driven by hydraulic pressure, which is divided into two categories of rubber sleeve type and mechanical type according to different implementation principles.

[0003] The rubber sleeve type chuck mainly relies on the hydraulic pressure to compress the rubber sleeve, and the rubber sleeve extrudes the slips to clamp the drill rod. When the oil is discharged, the slips are automatically reset to loosen the drill rod by the spring between the slips. The main components of the rubber sleeve type chuck include front and rear end covers, a chuck shell, a rubber sleeve, a support ring, a torque transmission disc, and a spring. Among them, the spring is installed between the slips for pre-tightening, and is bolted with the torque transmission disc. The outside is wrapped with a rubber sleeve, and the rubber sleeve is positioned by the support ring and the front and rear end covers. The main working principle is that high-pressure hydraulic oil is injected into the outer cavity of the rubber sleeve to continuously compress the rubber sleeve deformation, which in turn extrudes the connected slips to produce radial movement to clamp the drill rod. When the chuck is loosened, the hydraulic oil in the outer cavity of the rubber sleeve is controlled to be discharged, and the connected spring between the slips drives the slips to reset. However, the rubber sleeve type chuck has the following disadvantages:

[0004] 1. The main moving part of the rubber sleeve type chuck is the rubber sleeve, which is made of rubber. The fatigue cyclic stress generated during frequent extrusion process, combined with the influence of high-temperature hydraulic oil, will quickly cause the body to wear and age, and the rubber sleeve needs to be replaced frequently.

[0005] 2. The rubber sleeve type chuck is prone to oil leakage and clamping failure.

[0006] 3. The replacement of the rubber sleeve type chuck is time-consuming and laborious, and additional tooling is required, which seriously affects the drilling efficiency.

[0007] The common structure and working principle of the mechanical type chuck are as follows: the slips and the slip sleeve are in contact with each other, and when the hydraulic oil drives the axial movement of the slip sleeve, the friction force of the inclined surface will provide a centripetal radial component to push the slip to move and clamp the drill rod. Similarly, when loosening the drill rod, only the hydraulic oil is injected in the opposite direction, and the slip can be loosened. The main components of the mechanical type chuck include front and rear end covers, a slip sleeve, a retaining ring, and a chuck spindle. Among them, the slip and the slip sleeve are nested and connected, the contact surface of the two is inclined, and the movement direction of the slip is limited by the retaining ring and the chuck spindle. The main working principle is that the slip sleeve is subjected to high-pressure oil, which produces axial movement in the direction of the chuck spindle, generates inclined surface friction force on the contact surface of the slip, and generates radial force to push the slip to move radially and clamp the drill rod. When the chuck is loosened, the slip sleeve is moved in the opposite direction by the oil port, and the slip is loosened. However, the mechanical type chuck also has obvious defects:

[0008] The frequent friction and abrasion of the mechanical chuck due to the existence of the slip sleeve and the slip contact surface causes the gap of the contact surface, the change of the radial force direction of the slip, and the easy occurrence of the jamming phenomenon, and the slip cannot be opened in time after clamping the drill rod.

[0009] In addition, the rubber sleeve type chuck and the mechanical chuck also have the following common problems:

[0010] Both have too many internal parts, and it is time-consuming and laborious to replace the wear parts such as the slip and the rubber sleeve, especially the rubber sleeve type chuck needs special tooling to replace the rubber sleeve, and the process is quite complicated. Practical new type

[0011] Therefore, the purpose of the present application is to provide an oil cylinder type hydraulic chuck to solve the existing problems.

[0012] In order to achieve the above purpose, the present application provides the following technical scheme: an oil cylinder type hydraulic chuck, comprising a chuck shell, a main end cover, two side end covers, two slips, two piston rods, a first bolt, a first gasket, a second bolt, a second gasket, a first sealing ring and a second sealing ring; the main end cover is fixed to the axial end of the chuck shell through the first bolt and the first gasket, and the two side end covers are symmetrically fixed to the radial two sides of the chuck shell through the second bolt and the second gasket; the slips are radially symmetrically arranged at the inner stop of the chuck shell, and each slip is fixedly connected with a piston rod; four oil channels are arranged in the chuck shell, including two clamping oil paths and two releasing oil paths, and the clamping oil path and the releasing oil path are respectively communicated with the rodless cavity and the rod cavity of the piston rod.

[0013] Optionally, the first sealing ring is arranged between the sliding contact surface of the piston rod and the chuck shell, and the second sealing ring is arranged between the axial contact surface of the main end cover and the chuck shell.

[0014] Optionally, the first sealing ring and the sliding surface of the piston rod form a dynamic seal, and the second sealing ring and the end surface of the main end cover form a static seal, and the two together constitute a double oil leakage prevention structure.

[0015] Optionally, the main end cover, the chuck shell and the side end cover are detachably connected through the first bolt, the first gasket, the second bolt and the second gasket.

[0016] Optionally, the two piston rods and the two slips are arranged in a 180° symmetry, and the radial movement of the piston rod directly drives the slip to clamp or release the drill rod.

[0017] Optionally, the two clamping oil paths and the two releasing oil paths are not communicated with each other.

[0018] The utility model discloses beneficial effect lies in:

[0019] Firstly, compared with traditional rubber sleeve chuck and mechanical chuck, the oil cylinder hydraulic chuck adopts the oil cylinder piston rod mode to drive the slip to move radially, thereby clamping or loosening the drill rod.

[0020] Secondly, the number of main component parts of the oil cylinder hydraulic chuck is greatly reduced, which not only reduces the manufacturing cost, but also makes the replacement mode of the slip more simple and efficient.

[0021] In addition, the oil cylinder hydraulic chuck has a simple structure, the slip is uniformly stressed, and there is no key part friction and wear, so that it has a longer service life.

[0022] Finally, the design of the oil cylinder hydraulic chuck also considers the convenience and safety in actual operation.

[0023] In summary, the oil cylinder hydraulic chuck has the beneficial effects of simple structure, high disassembly efficiency, strong reliability, long service life, low maintenance cost and convenient and safe operation.

[0024] The other advantages, objects and features of the utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described in detail with preferred below, and the drawings will be combined:

[0026] Figure 1The hydraulic chuck internal structure schematic view of the utility model;

[0027] Figure 2 The utility model discloses a Figure 1 The middle A-A section view.

[0028] Reference signs: drill rod 1, first bolt 2, first gasket 3, side end cover 4, second bolt 5, second gasket 6, slip 7, first sealing ring 8, piston rod 9, chuck shell 10, main end cover 11, second sealing ring 12;

[0029] Among them, the clamping oil circuit is J oil channel, and the loosening oil circuit is S oil channel. Specific implementation

[0030] The other advantages and effects of the utility model can be easily understood by the person skilled in the art from the content disclosed in the specification. The utility model can also be implemented or applied by another different specific implementation, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the utility model in a schematic manner, and the following examples and features in the examples can be combined with each other without conflict.

[0031] Among them, the drawings are only used for example illustration, and the representation is only a schematic diagram, not a physical diagram, and can not be understood as a limitation on the utility model; in order to better illustrate the embodiments of the utility model, some components in the drawings can be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it can be understood that some known structures and their descriptions in the drawings can be omitted.

[0032] The same or similar reference signs in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it should be understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the position relationship in the drawings are only used for example illustration, and can not be understood as a limitation on the utility model, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0033] As Figure 1 And Figure 2As shown, the utility model provides a kind of oil cylinder type hydraulic chuck, it specifically includes chuck shell 10, main end cover 11, two side end covers 4, two slips 7, two piston rods 9, first bolt 2, first washer 3, second bolt 5, second washer 6, first sealing ring 8 and second sealing ring 12.

[0034] When assembling, main end cover 11 is fixed to the axial end of chuck shell 10 by first bolt 2 and first washer 3, to ensure the tight connection between main end cover 11 and chuck shell 10. At the same time, two side end covers 4 are symmetrically fixed to the radial sides of chuck shell 10 by second bolt 5 and second washer 6, to further reinforce the overall structure of the chuck.

[0035] Slips 7 are radially symmetrically arranged at the inner stop of chuck shell 10, and each slip 7 is fixedly connected with a piston rod 9. This symmetrical arrangement ensures that slips 7 are evenly stressed when clamping or releasing drill pipe 1, avoiding jamming.

[0036] Chuck shell 10 is internally provided with four oil channels, including two clamping oil paths and two releasing oil paths. The two clamping oil paths are respectively connected to the rodless chambers of piston rods 9, for inputting high-pressure oil when clamping drill pipe 1; and the two releasing oil paths are respectively connected to the rod chambers of piston rods 9, for inputting high-pressure oil when releasing drill pipe 1. The four oil channels are not communicated with each other, ensuring the independence and stability of the oil path system.

[0037] To further improve the sealing performance of the chuck, first sealing ring 8 is arranged between the sliding contact surface of piston rod 9 and chuck shell 10, to form dynamic sealing. At the same time, second sealing ring 12 is arranged between the axial contact surface of main end cover 11 and chuck shell 10, to form static sealing. This double oil leakage prevention structure can effectively prevent hydraulic oil leakage, ensuring the normal operation of the chuck.

[0038] In specific work, when drill pipe 1 needs to be clamped, two clamping oil paths (J oil channels) simultaneously input high-pressure oil, fill the rodless chambers of pistons and push slips 7 to move radially, thereby clamping drill pipe 1. When drill pipe 1 needs to be released, two releasing oil paths (S oil channels) simultaneously input high-pressure oil, fill the rod chambers of pistons and drive slips 7 to retract to the original position, realizing the release of the chuck.

[0039] Further, the oil cylinder type hydraulic chuck has the advantages of simple structure and high dismounting efficiency. When the slips 7 need to be replaced, the operator only needs to unscrew the first bolt 2, remove the main end cover 11, and then horizontally pull out the slips 7 for replacement, without the need to use complicated assembly tools for dismounting as in the traditional chuck. This design greatly reduces the downtime and maintenance cost of the drilling machine and improves the efficiency of drilling operations. Through the description of the above specific embodiments and the description of the reference signs, the structure and working principle of the oil cylinder type hydraulic chuck are clearly described. This new type of chuck not only solves the problems existing in the prior art, but also has the beneficial effects of simple structure, high dismounting efficiency, high reliability, long service life, low maintenance cost, convenient and safe operation, and wide application prospect and popularization value in the field of coal mine roadway drilling.

[0040] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A hydraulic cylinder chuck, characterized by: The chuck body, the main end cover, two side end covers, two slips, two piston rods, the first bolt, the first gasket, the second bolt, the second gasket, the first sealing ring and the second sealing ring are included. The main end cover is fixed to the axial end of the chuck body through the first bolt and the first gasket, and the two side end covers are symmetrically fixed to the radial two sides of the chuck body through the second bolt and the second gasket. The slips are radially symmetrically arranged at the inner stop of the chuck body, and each slip is fixedly connected with a piston rod. The chuck body is internally provided with four oil channels, including two clamping oil paths and two releasing oil paths, the clamping oil path and the releasing oil path are respectively communicated with the rodless cavity and the rod cavity of the piston rod, and the four oil channels are not communicated with each other.

2. The hydraulic cylinder chuck according to claim 1, characterized in that: The first sealing ring is arranged between the sliding contact surface of the piston rod and the chuck body, and the second sealing ring is arranged between the axial contact surface of the main end cover and the chuck body.

3. An oil cylinder type hydraulic chuck according to claim 2, characterized in that: The first sealing ring and the sliding surface of the piston rod form dynamic sealing, and the second sealing ring and the end surface of the main end cover form static sealing, and the two form a double oil leakage prevention structure.

4. The hydraulic cylinder chuck according to claim 1, wherein: The main end cover, the chuck body and the side end cover are detachably connected through the first bolt, the first gasket, the second bolt and the second gasket.

5. The hydraulic cylinder chuck according to claim 1, wherein: The two piston rods and the two slips are arranged in 180° symmetry, and the radial movement of the piston rod directly drives the slip to clamp or release the drill pipe.

Images