A hydraulic drilling rig power head chuck and rubber sleeve mold

Abstract

This utility model discloses a hydraulic drilling rig power head chuck and a rubber sleeve mold, including a slip, a rubber sleeve, and an outer sleeve arranged coaxially and radially outward. End pressure rings are provided at both axial ends of the slip and the rubber sleeve, and end caps are provided at both axial ends of the outer sleeve, the rubber sleeve, and the end pressure rings. Multiple circumferentially distributed torque transmission pin holes are provided on the end pressure rings, and pins are installed in the torque transmission pin holes. Each pin's two ends contact the end cap and the slip, respectively. A sealing ring is provided on the rubber sleeve to maintain a tight seal when the rubber sleeve is pressurized and deformed, preventing oil leakage from the chuck and thus ensuring the chuck's clamping performance. A metal retaining ring is embedded at the end of the rubber sleeve to ensure that the edge of the rubber sleeve will not be bitten during operation, reducing the frequency of rubber sleeve replacement and thus saving operating costs. This solves the technical problem of oil leakage caused by easy deformation of the rubber sleeve in existing hydraulic drilling rig power head chucks.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine tunnel drilling machinery, and relates to a hydraulic drilling rig power head chuck, specifically a hydraulic drilling rig power head chuck and a rubber sleeve mold. Background Technology

[0002] The chuck is a crucial working component of a drilling rig, responsible for clamping and releasing drill rods. During operation, the chuck must withstand axial loads and rotational torques, while simultaneously opening and closing frequently to clamp and release the drill rod. The structural strength and clearance of the chuck directly affect its performance. The rubber sleeve is a key component in the hydraulic drilling rig's power head chuck for clamping the drill rod, directly determining the rig's output capacity. Its working principle involves high-pressure oil entering the sealed cavity formed by the rubber sleeve and the chuck body through oil channels on the chuck's rear cover. The rubber sleeve is compressed, forcing the slips to move radially, thus clamping the drill rod. Upon oil return, the slips automatically return to their original position under spring force. During operation, the rubber sleeve must frequently transmit radial force and also provide a seal; therefore, its performance requirements are extremely high.

[0003] Currently, conventional hydraulic cylinders deform during operation, reducing the end sealing surface and causing high-pressure hydraulic oil to leak from the sealing surface. Simultaneously, the movement of the slips creates a shearing effect between the torque pin hole and the end pressure ring, potentially tearing the inner ring of the cylinder and causing further oil leakage. This reduces the chuck's clamping force, making it impossible to clamp the drill rod, significantly decreasing drilling efficiency. Statistics show that hydraulic cylinders for hydraulic drilling rigs are currently replaced approximately once a week. Therefore, the frequent damage to the cylinders greatly increases the user's operating costs.

[0004] To solve the above problems, there is an urgent need for a self-sealing rubber sleeve with anti-biting edge, so that the rubber sleeve hydraulic chuck can play a greater role. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a hydraulic drilling rig power head chuck and rubber sleeve mold, so as to solve the technical problem that the rubber sleeve in the existing hydraulic drilling rig power head chuck is prone to deformation and oil leakage.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A hydraulic drilling rig power head chuck includes a slip, a rubber sleeve, and an outer sleeve arranged coaxially and radially outward;

[0008] Both ends of the slip and the rubber sleeve are provided with end pressure rings, and both ends of the outer sleeve, the rubber sleeve and the end pressure ring are provided with end caps.

[0009] The end pressure ring has a plurality of torque transmission pin holes evenly distributed in the circumferential direction. A pin is provided in the torque transmission pin hole, and the two ends of each pin contact the end cap and the slip respectively.

[0010] The rubber tube includes a circular section, and radial protrusions are provided on both outer walls of the circular section. Multiple sealing rings are provided on each radial protrusion. Stepped grooves are provided at both ends of the circular section. Metal retaining rings are provided in the stepped grooves. End pressure rings are provided in the stepped grooves, and the metal retaining rings are in contact with the end pressure rings.

[0011] This utility model also includes the following technical features:

[0012] A support ring is provided between the two radial protrusions.

[0013] The sealing rings are provided in 2 to 3 parts.

[0014] Furthermore, a rubber cylinder mold for casting the rubber cylinder in the power head chuck of the hydraulic drilling rig includes an outer cylinder and an inner cylinder arranged coaxially, and stepped end caps are fixedly provided at both ends of the outer cylinder and the inner cylinder; multiple sealing ring prefabricated grooves are provided on the inner wall of the outer cylinder.

[0015] A magnet is provided on the outer wall of the stepped end cap, and a metal retaining ring is provided on the inner wall of the stepped end cap.

[0016] The stepped end cap is connected to both the outer and inner cylinders by bolts.

[0017] Compared with the prior art, the beneficial technical effects of this utility model are:

[0018] (I) In this utility model, a sealing ring is set on the rubber tube, which can maintain the sealing performance when the rubber tube is pressurized and deformed, prevent the chuck from leaking oil, and thus ensure the clamping performance of the chuck; a metal retaining ring is embedded at the end of the rubber tube, which ensures that the edge of the rubber tube will not be bitten during operation, reduces the frequency of rubber tube replacement, and thus saves the cost of use, and solves the technical problem of oil leakage caused by easy deformation of the rubber tube in the power head chuck of existing hydraulic drilling rigs in the prior art.

[0019] (II) The mold of this utility model is equipped with magnets, which can ensure that the metal retaining rings remain at both ends of the rubber tube during the injection molding process without displacement, thereby making the rubber tube integrally formed, reducing manufacturing costs, reducing installation difficulty, and greatly improving the maintainability of the equipment. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the hydraulic drilling rig power head chuck of this utility model.

[0021] Figure 2This is a schematic diagram of the structure of the rubber tube of this utility model.

[0022] Figure 3 yes Figure 2 A magnified view of part A in the image.

[0023] Figure 4 This is a partial working schematic diagram of the present invention.

[0024] Figure 5 yes Figure 4 A magnified view of part B in the image.

[0025] Figure 6 This is a cross-sectional schematic diagram of the rubber tube mold of this utility model.

[0026] Figure 7 This is an exploded perspective view of the rubber cylinder mold of this utility model.

[0027] The meanings of the labels in the diagram are as follows: 1-End cap, 2-Outer sleeve, 3-Support ring, 4-Rubber sleeve, 5-End pressure ring, 6-Torque transmission pin hole, 7-Clip, 10-Outer cylinder, 11-Inner cylinder, 12-Stepped end cap, 13-Pre-fabricated groove for sealing ring, 14-Magnet, 15-Bolt.

[0028] 401 - Round section, 402 - Radial protrusion, 403 - Stepped groove, 404 - Sealing ring, 405 - Metal retaining ring.

[0029] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, all components in this utility model are components known in the art.

[0031] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0032] This utility model provides a hydraulic drilling rig power head chuck, including a chuck 7, a rubber sleeve 4 and an outer sleeve 2 arranged coaxially and radially outward;

[0033] Both ends of the collet 7 and the rubber sleeve 4 are provided with end pressure rings 5, and both ends of the outer sleeve 2, the rubber sleeve 4 and the end pressure rings 5 ​​are provided with end caps 1.

[0034] The end pressure ring has multiple circumferentially evenly distributed torque transmission pin holes 6, and pins are provided in the torque transmission pin holes 6. The two ends of each pin are in contact with the end cover 1 and the slip 7, respectively.

[0035] The rubber sleeve 4 includes a circular section 401. Radial protrusions 402 are provided on both outer walls of the circular section 401. Multiple sealing rings 404 are provided on each radial protrusion 402. Stepped grooves 403 are provided at both ends of the circular section 401. Metal retaining rings 405 are provided in the stepped grooves 403. End pressure rings 5 ​​are provided in the stepped grooves 403. The metal retaining rings 405 are in contact with the end pressure rings 5.

[0036] In the above solution, a sealing ring 404 is provided on the rubber sleeve 4, which can maintain the sealing performance when the rubber sleeve is pressurized and deformed, prevent the chuck from leaking oil, and thus ensure the clamping performance of the chuck; a metal retaining ring 405 is embedded at the end of the rubber sleeve 4, which ensures that the edge of the rubber sleeve will not be bitten during operation, reduces the replacement frequency of the rubber sleeve, thereby saving the cost of use, and solves the technical problem of oil leakage caused by easy deformation of the rubber sleeve in the power head chuck of existing hydraulic drilling rigs in the prior art.

[0037] The metal retaining ring 405 is used to block the edge of the rubber tube 7 to ensure that the edge of the rubber tube 7 will not be cut by the edge of the end pressure ring 5 during operation and cause oil leakage.

[0038] A support ring 3 is provided between the two radial protrusions 402.

[0039] In the above technical solution, the function of the support ring 3 is to ensure that the two sides of the rubber tube 4 are tightly attached to the end cap 1 to achieve a seal.

[0040] Preferably, there are 2 to 3 sealing rings.

[0041] A rubber cylinder mold is also provided for casting rubber cylinders in the power head chuck of a hydraulic drilling rig. The mold is characterized by comprising an outer cylinder 10 and an inner cylinder 11 arranged coaxially, with stepped end caps 12 fixedly provided at both ends of the outer cylinder 10 and the inner cylinder 11; and multiple sealing ring prefabricated grooves 13 are provided on the inner wall of the outer cylinder.

[0042] A magnet 14 is provided on the outer wall of the stepped end cap 12, and a metal retaining ring 405 is provided on the inner wall of the stepped end cap 12.

[0043] The stepped end cap 12 is connected to both the outer cylinder 10 and the inner cylinder 12 by bolts 15.

[0044] In the above technical solution, the presence of magnets in the mold ensures that the metal retaining ring remains at both ends of the rubber tube during the injection molding process without displacement, thereby enabling the rubber tube to be integrally molded, reducing manufacturing costs, simplifying installation, and greatly improving the maintainability of the equipment.

[0045] By assembling the various parts of the mold and relocating the parting line to both ends of the mold, the area can be made to have a certain air venting capacity, which can meet the target of better injection filling while taking into account the original design principle.

[0046] By increasing the bolt preload, the clamping pressure at the feed end is increased, and the slide clearance is reduced to decrease the venting capacity of its venting area, thereby controlling the flow direction of the material in the mold. The mold temperature is increased by 20 degrees Celsius, the middle heating zone is increased by 10 degrees Celsius, and the filling speed to the corresponding recessed area is increased by 10%. The crystallization rate of the plastic material is reduced through the process, so that after the crystallization rate reaches the recessed area, a pressure supplementation and holding stage is performed. The pressure holding adopts a three-stage pressure holding stage. The first stage maintains 80% of the injection pressure for filling and provides continuous pressure for 12 seconds. The second and third stages of pressure holding are set for 3-5 seconds respectively to release the molecular stress generated during the injection molding process.

Claims

1. A hydraulic drilling rig power head chuck, characterized in that, It includes a collet (7), a rubber sleeve (4), and an outer sleeve (2) arranged coaxially and radially outward. Both ends of the slip (7) and the rubber sleeve (4) are provided with end pressure rings (5), and both ends of the outer sleeve (2), the rubber sleeve (4) and the end pressure ring (5) are provided with end caps (1). The end pressure ring is provided with a plurality of torque transmission pin holes (6) evenly distributed in the circumferential direction. Pins are provided in the torque transmission pin holes (6), and the two ends of each pin are in contact with the end cap (1) and the slip (7) respectively. The rubber sleeve (4) includes a circular section (401), and radial protrusions (402) are provided on both outer walls of the circular section (401). Each radial protrusion (402) is provided with multiple sealing rings (404). Both ends of the circular section (401) are provided with stepped grooves (403). A metal retaining ring (405) is provided in the stepped groove (403). The end pressure ring (5) is provided in the stepped groove (403). The metal retaining ring (405) contacts the end pressure ring (5).

2. The hydraulic drilling rig head chuck of claim 1, wherein, A support ring (3) is provided between the two radial protrusions (402).

3. The hydraulic drilling rig head chuck of claim 1, wherein, The sealing ring (404) is provided in 2 to 3 parts.

4. A rubber cylinder mold for casting the rubber cylinder in the power head chuck of a hydraulic drilling rig as described in any one of claims 1 to 3, characterized in that, It includes an outer cylinder (10) and an inner cylinder (11) arranged coaxially, and both ends of the outer cylinder (10) and the inner cylinder (11) are fixedly provided with stepped end caps (12); the inner wall of the outer cylinder is provided with multiple sealing ring prefabricated grooves (13). A magnet (14) is provided on the outer wall of the stepped end cap (12), and a metal retaining ring (405) is provided on the inner wall of the stepped end cap (12).

5. The rubber tube mold as described in claim 4, wherein the stepped end cap (12) is connected to the outer cylinder (10) and the inner cylinder (11) by bolts (15).

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