Hydraulic cylinder type clamping chuck for drilling machine

Abstract

The utility model relates to a hydraulic oil cylinder type clamping chuck for drilling machine, including chuck body, the chuck body is shell -shaped, the inside of chuck body is equipped with piston sleeve and a plurality of slips, the piston sleeve is along its axial sliding fit with chuck body, and the outer surface of piston sleeve and the inner wall of chuck body form two left and right sealed hydraulic cavities, and the inside of piston sleeve is opened with a plurality of along the axial extension through -groove along the circumference, the slip and through -groove all are wedge shape, and every slip is located in through -groove and cooperates with its inclined plane respectively, the inside of chuck body still is equipped with the limiting structure for limiting slip along the axial, and piston sleeve removes along the axial under the drive of hydraulic pressure, and a plurality of slips are extruded along the radial and are closed or open along the axial under the drive of hydraulic pressure. The hydraulic oil cylinder type clamping chuck for drilling machine not only can play the stable clamping effect to the drill rod, but also can avoid the hydraulic oil leakage situation while being convenient for replacing the slip.

Description

Technical Field

[0001] This utility model relates to the field of drill pipe clamping structure technology, specifically to a hydraulic cylinder type clamping chuck for drilling rigs. Background Technology

[0002] Drilling rigs are commonly used mechanical equipment in exploration engineering. Drilling rigs are usually equipped with clamping chucks for fixing drill rods. Traditional clamping chucks are often limited in size due to the limited spindle rotation space, while still needing to provide sufficient clamping force. Therefore, normally closed rubber sleeve chucks are often used. Under the action of high-pressure hydraulic oil, the rubber sleeve deforms as a whole to clamp the internal mechanical slips. During the entire clamping process, the rubber sleeve must play a role in radial clamping deformation and sealing the hydraulic oil. This places extremely high requirements on the material and workmanship of the rubber sleeve. Moreover, the slips are consumable parts that need to be replaced frequently. However, due to the deformation of the rubber sleeve, it is necessary to disassemble the rubber sleeve before replacing the slips. In the coal mining environment, this is not only time-consuming and labor-intensive, but also easily causes hydraulic oil contamination. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a hydraulic cylinder clamping chuck for drilling rigs, which not only provides stable clamping for the drill rod, but also facilitates the replacement of the slips and avoids hydraulic oil leakage.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a hydraulic cylinder type clamping chuck for drilling rigs, including a chuck body, the chuck body being shell-shaped, the chuck body having a piston sleeve and multiple slips inside, the piston sleeve slidingly engaging with the chuck body along its axial direction, the outer surface of the piston sleeve and the inner wall of the chuck body forming two sealed hydraulic chambers on the left and right, the piston sleeve having multiple through grooves extending axially along its circumference, the slips and through grooves being wedge-shaped, each slip being located in the through groove and engaging with its inclined surface, the chuck body also having a limiting structure for limiting the slips along the axial direction, the piston sleeve moving axially under hydraulic drive, the multiple slips being squeezed by the piston sleeve and radially contracting or opening.

[0005] The working principle of this solution is as follows: When it is necessary to clamp the drill rod, the drill rod is inserted into the chuck body and positioned between multiple slips. Then, hydraulic oil is injected into the hydraulic chamber, pushing the piston sleeve to move from the lower end of the slips to the higher end. Since the slips are axially limited by the limiting structure on both sides and the slips cooperate with the through groove inclined surface on the piston sleeve, when the piston sleeve moves axially, the multiple slips are squeezed radially by the piston sleeve, clamping the drill rod. When it is necessary to remove the drill rod, the piston sleeve is pushed by hydraulic oil to move from the higher end of the slips to the lower end. The slips no longer clamp the drill rod, and the drill rod can be moved outward.

[0006] Compared with existing technologies, the advantages of this solution are as follows: By cooperating with the wedge-shaped slips, the through grooves on the piston sleeve, and the limiting structure, the axial movement of the piston sleeve is converted into the radial movement of the slips. Multiple slips converge radially along the chuck body, ensuring the clamping effect on the drill pipe. When the slips need to be replaced, they can be moved radially out of the chuck body. Compared with using hydraulic oil to drive the overall deformation of the rubber sleeve to tighten the slips and clamp the drill pipe, the operation of replacing slips is more convenient through the cooperation between the slips and the inclined surface of the piston sleeve. Moreover, the hydraulic oil is located between the outer surface of the piston sleeve and the hydraulic cavity of the chuck body. The sealing of the hydraulic oil and the clamping of the drill pipe are respectively handled by the piston sleeve and the slips, without the rubber sleeve acting simultaneously. This avoids hydraulic oil leakage when replacing slips, thereby improving work efficiency and avoiding pollution.

[0007] In a preferred embodiment of this utility model, multiple through slots and multiple slips are evenly spaced along the circumference of the piston sleeve and the chuck body.

[0008] The beneficial effects of this solution are: multiple slips correspond one-to-one with multiple through slots, and the slips and through slots are evenly spaced, which ensures that the drill rod is subjected to uniform force when the slips clamp the drill rod, thereby improving the stability of clamping.

[0009] In a preferred embodiment of the present invention, the limiting structure includes a first limiting part and a second limiting part that engages with the first limiting part. The latch is located between the first limiting part and the second limiting part, and the two sides of the latch abut against the inner sides of the first limiting part and the second limiting part, respectively. The latch extends radially out of the first limiting part.

[0010] The beneficial effects of this solution are: the first and second limiting parts not only limit the slips in the axial direction, preventing the slips from moving axially when the piston sleeve moves along the axial direction of the chuck body, thus preventing them from failing to clamp the drill pipe in the radial direction, but also guide the slips in the radial direction.

[0011] In a preferred embodiment of the present invention, the first limiting part is located on the lower side of the slip, the first limiting part includes a first connecting plate and a plurality of first blocks disposed on one side of the first connecting plate, the outer surface of the first block contacts the inner wall of the piston sleeve and the gap between two adjacent first blocks corresponds to the position of the through groove, and one side of the slip abuts against the first connecting plate.

[0012] The beneficial effects of this solution are: the slip is located between two adjacent first blocks, and the first limiting part limits one side of the slip in the axial direction.

[0013] In a preferred embodiment of the present invention, the second limiting part is located on the higher side of the slip, and the second limiting part includes a second connecting plate and a plurality of second blocks disposed on one side of the second connecting plate. The positions of the second blocks correspond one-to-one with the through grooves, and the other side of the slip abuts against the front side of the second blocks.

[0014] The beneficial effects of this solution are as follows: the gap between two adjacent first stops corresponds to the position of the through groove, the position of the second stop corresponds one-to-one with the position of the through groove, and the two sides of the slip abut against the first connecting plate and the second connecting plate respectively. That is, the slip is located between the gap formed by the first stop and the second stop, and the gap plays a limiting role in the axial direction and a guiding role in the radial direction for the slip.

[0015] In a preferred embodiment of the present invention, the top of the through groove is provided with a T-shaped limiting groove, and the upper side of the clamp is provided with a T-shaped connecting block that slides with the limiting groove.

[0016] The beneficial effects of this solution are: after drilling is completed, the drill rod needs to be removed from the chuck body. When the piston sleeve moves along the higher end of the slip to the lower end, it causes the slip to open radially, so that the slip returns to its initial position, which facilitates the clamping of the drill rod next time.

[0017] In a preferred embodiment of this utility model, the inner surface of the clasp is provided with a plurality of protrusions at intervals.

[0018] The beneficial effect of this solution is that it increases friction, thereby making the slips more stable in clamping the drill pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an embodiment of the hydraulic cylinder clamping chuck for drilling rigs according to this utility model.

[0020] Figure 2 This is an exploded view of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure when the first limiting part limits the movement of the slip.

[0022] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for explaining the present invention and do not limit the scope of protection of the present invention.

[0024] The terms "first," "second," etc., used in the specification, claims, and embodiments of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0025] The present invention will be further described in detail below through preferred embodiments:

[0026] The reference numerals in the accompanying drawings include: chuck body 1, piston sleeve 2, through groove 201, limit groove 202, slip 3, T-shaped connecting block 301, first connecting plate 4, first stop block 5, second connecting plate 6, second stop block 7, protrusion 8, end cap 9.

[0027] As attached Figure 1 and attached Figure 2 As shown: The hydraulic cylinder clamping chuck for drilling rigs in this embodiment includes a chuck body 1 and end caps 9 detachably connected to both ends of the chuck body 1. The end caps 9 have a through hole in the middle. The chuck body 1 is shell-shaped, and a piston sleeve 2 is provided inside the chuck body 1. The piston sleeve 2 slides axially with the chuck body 1. The outer surface of the piston sleeve 2 and the inner wall of the chuck body 1 form two sealed hydraulic chambers. The chuck body 1 has an oil inlet communicating with the hydraulic chambers (not shown in the figure). The piston sleeve 2 moves axially under hydraulic pressure. Multiple axially extending through grooves 201 are circumferentially formed inside the piston sleeve 2. In this embodiment, five are preferably provided. Each through groove 201 is wedge-shaped, and the top of each through groove 201 has a T-shaped limiting groove 202. (See attached figure.) Figure 3 As shown.

[0028] As attached Figure 2 As shown: Multiple slips 3 are evenly spaced along the circumference inside the chuck body 1. In this embodiment, five slips are preferably provided. Each slip 3 is wedge-shaped and is located in the through groove 201 and engages with its inclined surface. Several protrusions 8 are spaced apart on the inner surface of the slips 3. A T-shaped connecting block 301 is provided on the upper side of the slip and engages with the limiting groove 202.

[0029] As attached Figure 2 and attached Figure 3 As shown: The chuck body 1 is further provided with a limiting structure for limiting the slip 3 in the axial direction. The limiting structure includes a first limiting part and a second limiting part that engages with the first limiting part. The slip 3 is located between the first limiting part and the second limiting part. The two sides of the slip 3 abut against the inner sides of the first limiting part and the second limiting part, respectively. The slip 3 extends radially out of the first limiting part. The first limiting part and the second limiting part are limited in the axial direction by the end caps 9 provided on both sides of the chuck body 1.

[0030] Specifically, the first limiting part is located on the lower side of the slip 3. The first limiting part includes a first connecting plate 4 and a plurality of first blocks 5 disposed on one side of the first connecting plate 4. The outer surface of the first block 5 contacts the inner wall of the piston sleeve 2 and the gap between two adjacent first blocks 5 corresponds to the position of the through groove 201. One side of the slip 3 abuts against the first connecting plate 4. In this embodiment, a stepped groove is opened at the front end of the first block 5.

[0031] The second limiting part is located on the higher side of the slip 3. The second limiting part includes a second connecting plate 6 and a plurality of second blocks 7 disposed on one side of the second connecting plate 6. The positions of the second blocks 7 correspond one-to-one with the through groove 201. The other side of the slip 3 abuts against the front side of the second blocks 7. In this embodiment, the side of the second connecting plate 6 with the second blocks 7 abuts against the bottom of the stepped groove.

[0032] Specific clamping process:

[0033] In the initial state, the end caps 9 are installed on both sides of the chuck body 1 via locking components. The end caps 9 limit the first and second limiting parts in the axial direction. At this time, the slips 3 are located between the first stop 5 and the second stop 7 in the axial direction, and extend from the upper side of the slips 3 into the first stop 5 and are located in the through groove 201 in the radial direction. When it is necessary to clamp the drill rod, the drill rod is inserted into the chuck body 1 and positioned between the five slips 3. Then, hydraulic oil is injected into one of the hydraulic chambers, pushing the piston sleeve 2 to move from the lower end of the slip 3 to the higher end. The slips 3 are compressed radially by the piston sleeve 2, thus clamping the drill rod. The drill rod is clamped. When it is necessary to remove the drill rod, hydraulic oil is injected into another hydraulic chamber. The hydraulic oil pushes the piston sleeve 2 to move from the higher end of the slip 3 to the lower end. At this time, the slip 3 no longer clamps the drill rod, and the drill rod can be moved outward. When it is necessary to replace the slip 3, first loosen the locking part, remove the end cover 9, and then move the first or second limiting part radially out of the chuck body 1. Then take out the slip 3 and put in the new slip 3. Then insert the first or second limiting part into the chuck body 1 in sequence to limit the slip 3. Finally, install the end cover 9 on the chuck body 1.

[0034] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. Typical known structures and common knowledge techniques in the preferred embodiments have not been described in detail here. Those skilled in the art can improve and implement the technical solution of this utility model based on the inspiration given in these embodiments and their own capabilities. Some typical known structures, known methods or common knowledge techniques should not be obstacles for those skilled in the art to implement this application.

[0035] The scope of protection claimed in this application shall be determined by the contents of its claims. The contents of the utility model description, specific embodiments, and drawings are used to interpret the claims.

[0036] Within the scope of the technical concept of this application, several modifications can be made to the specific implementation of this application, and these modified implementations should also be considered within the protection scope of this application.

Claims

1. A hydraulic cylinder-type clamping chuck for drilling rigs, comprising a chuck body, wherein the chuck body is shell-shaped, characterized in that: The chuck body is equipped with a piston sleeve and multiple slips inside. The piston sleeve slides with the chuck body along its axial direction. The outer surface of the piston sleeve and the inner wall of the chuck body form two sealed hydraulic chambers on the left and right. Multiple through grooves extending axially are opened circumferentially inside the piston sleeve. The slips and through grooves are wedge-shaped. Each slip is located in the through groove and engages with its inclined surface. The chuck body is also equipped with a limiting structure for limiting the slips along the axial direction. The piston sleeve moves axially under hydraulic pressure, and the multiple slips are squeezed by the piston sleeve and shrink or open radially.

2. The hydraulic cylinder clamping chuck for drilling rigs according to claim 1, characterized in that: Multiple through slots and multiple slips are evenly spaced along the circumference of the piston sleeve and the chuck body.

3. The hydraulic cylinder clamping chuck for drilling rigs according to claim 1, characterized in that: The limiting structure includes a first limiting part and a second limiting part that engages with the first limiting part. The slip is located between the first limiting part and the second limiting part. The two sides of the slip abut against the inner sides of the first limiting part and the second limiting part, respectively. The slip extends radially out of the first limiting part.

4. The hydraulic cylinder clamping chuck for drilling rigs according to claim 3, characterized in that: The first limiting part is located on the lower side of the slip. The first limiting part includes a first connecting plate and a plurality of first blocks disposed on one side of the first connecting plate. The outer surface of the first block contacts the inner wall of the piston sleeve and the gap between two adjacent first blocks corresponds to the position of the through groove. One side of the slip abuts against the first connecting plate.

5. The hydraulic cylinder clamping chuck for drilling rigs according to claim 4, characterized in that: The second limiting part is located on the higher side of the slip. The second limiting part includes a second connecting plate and a plurality of second blocks disposed on one side of the second connecting plate. The positions of the second blocks correspond one-to-one with the through grooves. The other side of the slip abuts against the front side of the second blocks.

6. The hydraulic cylinder clamping chuck for drilling rigs according to claim 1, characterized in that: The top of the through groove is provided with a T-shaped limiting groove, and the upper side of the slip is provided with a T-shaped connecting block that slides with the limiting groove.

7. The hydraulic cylinder clamping chuck for drilling rigs according to claim 1, characterized in that: The inner surface of the clasp is provided with several protrusions at intervals.

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