Novel mechanical chuck for coal mine underground drill rig

Abstract

The utility model relates to the technical field of underground drill rigs, and particularly discloses a novel mechanical chuck for a coal mine underground drill rig. The mechanical chuck comprises a rubber gland, a stripper rubber, a top sleeve, a front end cover, a piston, a cylinder barrel, a slip bowl, a slip, a guide key, a rear end cover, a mechanical chuck connecting disc, a mechanical chuck torque pin, a mechanical chuck torque disc oil port sealing ring, a plurality of sealing pieces, standard pieces and other parts. According to the scheme, the problem that a drill rod slips due to insufficient clamping force of an existing chuck can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel drilling machines, in particular to a novel mechanical chuck for coal mine tunnel drilling machines. Background Art

[0002] Coal mine tunnel drilling equipment technology is widely used in the fields of coal mine gas, geological exploration, and water exploration and drainage, and plays an important role in ensuring the safe production of coal mines. The fully hydraulic tunnel drilling rig for coal mines is a relatively common drilling equipment. Due to its strong adaptability, easy movement, and reasonable and reliable structure, it has gradually become the main equipment for gas drilling. The hydraulic chuck of the tunnel drilling rig is a key component in the drilling rig. It is mainly used to fix the drill rod so that the drill rod can be rotated for drilling. The power part uses a hydraulic motor to drive the reduction mechanism output. After the power is transmitted to the mechanical or hydraulic chuck, the chuck holds the drill rod tightly and drives the drill rod to rotate. The drill bit at the front end of the drill rod breaks the rock to achieve footage.

[0003] During routine drilling, insufficient chuck clamping force often causes drill rod slippage, while frequent opening and closing of the clamping cylinder can cause oil leakage, leading to chuck failure. Furthermore, slag can easily accumulate in the chuck, resulting in an awkward clamping action and hindering the passage of the drill tool. Utility Model Content

[0004] The utility model provides a novel mechanical chuck for a coal mine tunnel drill, so as to solve the problem that the existing chuck has insufficient clamping force, which causes the drill rod to slip.

[0005] In order to solve the above problems, the technical solution adopted by the utility model is as follows: a new type of mechanical chuck for coal mine tunnel drilling rigs, characterized in that it comprises a front end cover, a cylinder, a slip seat, a guide key, and a rear end cover which are arranged in sequence axially horizontally; an axially horizontal top sleeve is sealedly connected to the inner wall of the front end cover; the inner wall of the slip seat is conical; a plurality of petal slips are slidably connected to the inner wall of the slip seat; the slips are arranged at intervals along the circumferential direction of the inner wall of the slip seat; a keyway is axially opened on the inner wall of the slip seat; the guide key matches the keyway; the guide key is connected to the outer wall of the slip by bolts; the slip can move radially and axially along the conical surface of the slip seat, and a radial clamping force is applied to the drill rod axially arranged horizontally inside the slip through the radial movement of the slip;

[0006] A piston that can slide in the axial direction is provided between the front end cover, the cylinder barrel, and the slips. The right end face of the piston is in contact with the slips. An oil passage is connected to the end face of the piston close to the front end cover. By injecting oil into the oil passage, pressure can be applied to the end face of the piston close to the front end cover, thereby pushing the piston to slide toward the slips.

[0007] A plurality of nitrogen springs are provided between the end wall of the slip close to the rear end cover and the rear end cover. The nitrogen springs are arranged at intervals along the circumference of the slip. The slip that moves axially can be reset by the elastic force of the nitrogen springs. A connecting disk is fixed on the end surface of the rear end cover away from the slip, and the entire mechanical chuck is fixed to the output shaft of the power head of the external anchor drilling rig through the connecting disk.

[0008] The basic principle of this solution is as follows: the threaded portion on the right end of the mechanical chuck is connected to the threaded portion of the tunnel drill output. When the power head rotates, the mechanical chuck and the power head output rotate together. In normal, non-operating conditions, the slips are loose, allowing the drill pipe to pass easily through the hole without getting stuck. When oil flows along the power head output shaft to the rear end cover, slip seat, and cylinder barrel, the increasing pressure overcomes the preload of the nitrogen spring, and the piston slowly moves to the right, pushing the slips along the taper of the slip seat to achieve axial and radial movement. The radial movement reduces the inner diameter of the three-petal slip, creating a radial clamping force on the drill pipe.

[0009] The beneficial effects of this solution are: radial clamping is performed by sliding a plurality of slips along the conical surface, the clamping force is three times that of the existing mechanical chuck, and there are fewer parts, low maintenance costs, easy operation and high efficiency.

[0010] Furthermore, a step ring groove is opened on the end face of the front end cover, and an annular sealing rubber is provided at the bottom of the step ring groove. The inner wall of the sealing rubber is in contact with the outer wall of the top sleeve, and an annular rubber pressure cover is fixed to the opening of the step ring groove, and the sealing rubber is fixed in the step ring groove through the rubber pressure cover.

[0011] Furthermore, a grease nipple is provided on the outer wall of the slip seat, through which lubricating oil can be added to the contact surface between the slip and the slip seat.

[0012] Furthermore, a wear-resistant belt, a shaft grid ring, and a wear-resistant belt are sequentially embedded on the outer wall of the piston along the axial direction.

[0013] Furthermore, one end of the oil passage is connected to the end face of the piston, and the other end of the oil passage is connected to the end face of the rear end cover. The oil passage passes through the rear end cover, the slip seat, and the side wall of the cylinder in sequence.

[0014] Furthermore, a plurality of threaded blind holes are circumferentially spaced on the end wall of the cava seat, and a through hole is opened at the rear end cover corresponding to the threaded blind hole. A double-headed screw is threadedly connected to the threaded blind hole, and the other end of the double-headed screw is threadedly connected to an external hexagonal nut after passing through the through hole.

[0015] Furthermore, one end of the nitrogen spring close to the slip seat extends into the slip seat, and one end of the nitrogen spring away from the slip seat is connected to an axially horizontal universal sliding bearing, which is connected to the rear end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A side view of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 BB stereoscopic cross-sectional view;

[0018] Figure 3 for Figure 1 BB front cross-sectional view;

[0019] Figure 4 for Figure 3 Schematic diagram of part I;

[0020] Figure 5 It is a partial cross-sectional view of an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific implementation methods:

[0022] The figure marks in the drawings of the specification include: rubber gland 1, sealing rubber 2, top sleeve 3, front end cover 4, piston 5, cylinder 6, slip seat 7, slip 8, guide key 9, rear end cover 10, connecting plate 11, torque pin 12, oil port seal 13, PTFE retaining ring 14, O-ring 15, dust ring 16, wear-resistant belt 17, grid ring for first shaft 18, grid ring for second shaft 19, Y-type seal 20, first hexagon socket screw 21, spring washer 22, grease nipple 23, external hexagon nut 24, spring washer 25, stud screw 26, second hexagon socket screw 27, universal sliding bearing 28, nitrogen spring 29, third hexagon socket screw 30.

[0023] Example 1 is basically as shown in the attached Figure 1 To the attached Figure 5 As shown:

[0024] A new type of mechanical chuck for coal mine tunnel drilling rig has a horizontal axis and a right end threadedly connected to the output shaft of the power head of the tunnel drilling rig. When the power head rotates, the mechanical chuck and the power head output rotate together.

[0025] From left to right along the axial direction of the mechanical chuck are the front end cover 4, cylinder 6, cava seat 7, rear end cover 10, and connecting disk 11. The front end cover 4 is in the shape of a T-shaped sleeve, and the left end of the front end cover 4 is disc-shaped, and the right end of the front end cover 4 is columnar. The inner diameter of the cylinder 6 is larger than the inner diameter of the right end of the front end cover 4, thereby forming a cylindrical cavity between the inner wall of the cylinder 6 and the outer wall of the right end of the front end cover 4. A piston 5 that can slide back and forth left and right is sealed in the cylindrical cavity, and the right end of the piston 5 abuts against the inside of the cava seat 7. The outside of the cava seat 7 is a circumferential surface, and the inner wall of the cava seat 7 is a conical surface that shrinks inward from left to right. The inside of the cava seat 7 is coaxially installed with three-petal cava 8 arranged at intervals along the circumference, and the outer wall of the three-petal cava 8 fits the inner wall of the cava seat 7 The three-petal slip 8 is conical, and the inner wall of the three-petal slip 8 is cylindrical, which is used to fit the outer circumferential surface of the drill pipe. The three-petal slip 8 can slide along the inner wall of the slip seat 7. A number of axially horizontal nitrogen springs 29 are installed between the right end face of the three-petal slip 8 and the left end face of the rear end cover 10. The nitrogen springs 29 are evenly spaced along the circumference of the right end face of the three-petal slip 8. A threaded blind hole with an opening to the right is opened in the slip seat 7, and a through hole is opened at the corresponding blind hole on the rear end cover 10. The stud screw 26 is passed through the through hole and then threadedly connected to the threaded blind hole. The other end of the stud screw 26 is threadedly connected to the external hexagonal nut 24. A spring washer 22 is sleeved between the external hexagonal nut 24 and the stud screw 26, so that the slip seat 7 and the rear end cover 10 are fastened together by the stud screw 26. The connection plate 11 is fixed on the right end surface of the rear end cover 10. The connection plate 11 and the corresponding positions on the rear end cover 10 are also penetrated by through holes, wherein the through holes on the connection plate 11 are internal threaded through holes. The second hexagon socket screw 27 is a hexagon socket countersunk screw that passes through the rear end cover 10 and the connection plate 11 from left to right, thereby fastening the rear end cover 10 to the connection plate 11. Figure 5 As shown, in this embodiment, the number of the double-headed screws 26 is 16, and they are arranged at circumferential intervals along the rear end cover 10. The number of the second hexagon socket screws 27 is 40, and they are also arranged at circumferential intervals along the rear end cover 10, and the installation radius of the second hexagon socket screws 27 is smaller than the installation radius of the double-headed screws 26.

[0026] like Figure 3As shown, an oil port is opened on the right end face of the rear end cover 10, and the oil port extends radially downward along the rear end cover 10 to form an oil channel, which passes through the left end face of the rear end cover 10 horizontally to the left, and extends an oil channel horizontally to the left at the corresponding right end face of the cava seat 7. The oil channel passes through the left end face of the cava seat 7, and extends an oil channel horizontally to the left at the corresponding right end face of the cylinder 6. The oil channel extends upward and connects with the piston 5, and oil port sealing rings 13 are respectively installed on the mating surfaces of the oil channels on the rear end cover 10, the cava seat 7, and the cylinder 6 to ensure the sealing of the oil channels on each component after they are connected. After the mechanical chuck described in this embodiment is installed as a whole on the power head of the anchor drilling rig, since a corresponding docking oil channel is designed on the output shaft of the power head, when the mechanical chuck is installed, the oil channel on the mechanical chuck coincides with the docking oil channel on the output shaft of the power head, and an oil port sealing ring 13 is provided at the oil channel port in this embodiment, so that the oil channel can be effectively docked and sealed. After docking, the oil is transported in the oil channel and flows along the output shaft of the power head to the rear end cover 10, the cava seat 7, and the cylinder 6 in sequence, and finally enters the cavity where the piston 5 is located. As the pressure in the cavity where the piston 5 is located increases, after overcoming the pre-pressure of the nitrogen spring 29 on the right end face of the cava 8, the piston 5 slowly moves to the right and pushes the cava 8 on the right side along the tapered direction of the cava seat 7 to achieve axial and radial movement, wherein the radial movement causes the inner diameter of the three-petal cava 8 to become smaller, thereby forming a radial clamping force on the drill rod.

[0027] like Figure 3 As shown, an oil passage is provided on the outer wall of the cava seat 7 and vertically penetrates the cava seat 7. A grease nipple 23 is installed at the opening of the oil passage. Lubricating oil can be added to the contact surface between the cava seat 7 and the cava 8 through the grease nipple 23, thereby ensuring the smoothness of the reciprocating sliding of the cava 8 in the cava seat 7.

[0028] like Figure 5 As shown, the front end cover 4, the cylinder barrel 6, and the cava seat 7 are fixed as a whole by two opposite second hexagon socket screws 27. Specifically, threaded blind holes with openings facing outward are respectively processed on the two end surfaces of the cylinder barrel 6, and through holes are respectively opened at the corresponding threaded blind holes on the front end cover 4 and the cava seat 7. After the second hexagon socket screw 27 passes through the through hole and is threadedly connected to the threaded blind hole, the front end cover 4 can be connected to the cylinder barrel 6. Another second hexagon socket screw 27 in the opposite direction is passed through the through hole on the cava seat 7 and then threadedly connected to the threaded blind hole, so that the cava seat 7 can be connected to the cylinder barrel 6.

[0029] To prevent oil leakage from the piston 5, sealing structures are provided on the contact surfaces between the front end cover 4 and the top cover, the contact surfaces between the piston 5 and the cylinder 6, and the contact surfaces between the cylinder 6 and the front end cover 4. Specifically, a step ring groove is provided on the left end face of the front end cover 4, a sealing rubber 2 is installed at the bottom of the step ring groove, and an annular rubber gland 1 is embedded in the opening of the step ring groove to secure the sealing rubber 2 in the step ring groove. A dust ring 16 is sleeved on the right side of the sealing rubber 2 and on the outer wall of the cylinder 6. An O-ring 15 and a PTFE retaining ring 14 are installed between the contact surfaces of the front end sleeve and the cylinder 6. A second shaft grid ring 19 and a Y-shaped sealing ring 20 are provided between the contact surfaces of the front end sleeve and the piston 5. A wear-resistant strip 17, a first shaft grid ring 18, and a wear-resistant strip 17 are sleeved in sequence along the axial direction between the contact surfaces of the piston 5 and the cylinder 6.

[0030] An axially horizontal torque pin is installed through the rear end cover to transmit the power from the power head output shaft to the mechanical chuck. A guide key is bolted to the outside of the slips. The guide key matches the keyway on the slip seat and limits the sliding path of the slips.

[0031] The specific implementation process is as follows:

[0032] The threaded part on the right end of the mechanical chuck is connected to the threaded part on the output end of the tunnel drilling rig. When the power head rotates, the mechanical chuck and the power head output rotate together. An oil channel is designed on the output shaft of the power head. When the mechanical chuck is properly installed, the oil channel and the oil channel of the chuck coincide with each other and are effectively sealed due to the end face seal. In normal and non-working conditions, the cava 8 is in a loose state and the drill rod can easily pass through the hole without getting stuck. When oil in the oil circuit flows along the output shaft of the power head to the rear end cover 10, the cava seat 7 and the cylinder 6, as the pressure increases, the piston 5 slowly moves to the right to overcome the pre-compression of the nitrogen spring 29 and pushes the cava 8 along the taper direction of the cava seat 7 to achieve axial and radial movement. The radial movement causes the inner diameter of the three-petal cava 8 to become smaller, thereby forming a radial clamping force on the drill rod.

[0033] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A new type of mechanical chuck for coal mine tunnel drilling rig, characterized in that: It comprises a front end cover, a cylinder, a slip seat, a guide key and a rear end cover which are arranged in sequence in an axial horizontal direction. The inner wall of the front end cover is sealedly connected with an axially horizontal top sleeve. The inner wall of the slip seat is a conical surface. A plurality of slips are slidably connected with the inner wall of the slip seat. The slips are arranged at intervals along the circumference of the inner wall of the slip seat. A keyway is opened in the axial direction on the inner wall of the slip seat. The guide key matches the keyway. The guide key is connected to the outer wall of the slip by bolts. The slip can move radially and axially along the conical surface of the slip seat. The radial movement of the slip applies a radial clamping force to the drill rod arranged axially horizontally inside the slip. A piston that can slide in the axial direction is provided between the front end cover, the cylinder barrel and the slips, the right end face of the piston is in contact with the slips, and an oil passage is connected to the end face of the piston close to the front end cover. By injecting oil into the oil passage, pressure can be applied to the end face of the piston close to the front end cover, thereby pushing the piston to slide toward the slips; A plurality of nitrogen springs are arranged between the end wall of the slip close to the rear end cover and the rear end cover. The nitrogen springs are arranged at intervals along the circumference of the slip. The slip moving axially can be reset by the elastic force of the nitrogen springs. A connecting disk is fixed on the end surface of the rear end cover away from the slip. The entire mechanical chuck is fixed to the output shaft of the power head of the external anchor drilling rig through the connecting disk.

2. A novel mechanical chuck for coal mine tunnel drilling rig according to claim 1, characterized in that: A step ring groove is opened on the end surface of the front end cover, and an annular sealing rubber is provided at the bottom of the step ring groove. The inner wall of the sealing rubber is in contact with the outer wall of the top sleeve, and an annular rubber pressure cover is fixed to the opening of the step ring groove, and the sealing rubber is fixed in the step ring groove through the rubber pressure cover.

3. A novel mechanical chuck for coal mine tunnel drilling rig according to claim 2, characterized in that: A grease nipple is provided on the outer wall of the slip seat, and lubricating oil can be added to the contact surface between the slip and the slip seat through the grease nipple.

4. A novel mechanical chuck for coal mine tunnel drilling rig according to claim 3, characterized in that: The outer wall of the piston is sequentially embedded with a wear-resistant belt, a shaft grid ring and a wear-resistant belt along the axial direction.

5. A novel mechanical chuck for coal mine tunnel drilling rig according to claim 4, characterized in that: One end of the oil passage is connected to the end surface of the piston, and the other end of the oil passage is connected to the end surface of the rear end cover. The oil passage passes through the rear end cover, the slip seat, and the side wall of the cylinder barrel in sequence.

6. A novel mechanical chuck for coal mine tunnel drilling rig according to claim 5, characterized in that: A plurality of threaded blind holes are circumferentially spaced apart on the end wall of the cava seat, and a through hole is formed at the rear end cover corresponding to the threaded blind hole. A double-headed screw is threadedly connected to the threaded blind hole, and the other end of the double-headed screw is threadedly connected to an external hexagonal nut after passing through the through hole.

7. A novel mechanical chuck for coal mine tunnel drilling rig according to claim 6, characterized in that: One end of the nitrogen spring close to the slip seat extends into the slip seat, and one end of the nitrogen spring away from the slip seat is connected to an axially horizontal universal sliding bearing, which is connected to the rear end cover.

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