A hydraulic drill jumbolter and method

Abstract

The present invention relates to a hydraulic screw drill boom and method, belonging to the technical field of mine rock drilling jumbo equipment. The technical solution is as follows: The piston body and the inner and outer screw sleeves are integrally welded to form a piston. The piston makes reciprocating motions under the push of the hydraulic oil in the left and right chambers of the rotary cylinder. At the same time, since the internal gear ring is fastened on the inner conical surface as a fixed part and cannot rotate, under the cooperation of the first helical spline pair, the piston makes a rotational motion while making a linear motion (similar to a lead screw mechanism). Since the first helical spline pair and the second helical spline pair have opposite helix directions, the rotary shaft makes a rotational motion in the same direction under the cooperation of the second helical spline pair. The positive effects of the present invention are as follows: It strengthens the strength and stiffness of the root of the drill boom in the working state, and also utilizes the good stiffness of the hollow shaft to increase the stiffness of the drill boom, which is beneficial to increasing the stability of the working support environment of the hydraulic rock drill. At the same time, it is applicable to the tunnel construction environment with a relatively small height dimension.

Description

Technical Field

[0001] The present invention relates to a hydraulic spiral drill arm and method, belonging to the technical field of mine rock drilling jumbo equipment. Background Art

[0002] A rock drilling jumbo is a rock drilling equipment used in tunnel and underground engineering construction by the drill and blast method. It can move and support multiple rock drills to perform drilling operations simultaneously. The drill arms of existing rock drilling jumbos generally use traditional square tube shapes or solid shaft types, and a hydraulic spiral cylinder is installed at the front section of the drill arm, resulting in contradictions among the stiffness, length dimension, and radial dimension of the drill arm, and it is not suitable for tunnel construction environments with small height dimensions. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydraulic spiral drill arm and method, which integrates the hydraulic spiral cylinder inside the suspension end of the drill arm, strengthens the strength and stiffness of the root of the drill arm during use, and also utilizes the good stiffness characteristics of the hollow shaft to increase the stiffness of the drill arm, which is beneficial to increasing the stability of the working support environment of the hydraulic rock drill and solving the above problems existing in the background art.

[0004] The technical solution of the present invention is as follows:

[0005] A hydraulic spiral drill arm includes a rotary cylinder block, a branch pipe body, a rotary shaft, an internal gear ring, a piston body, and an internal and external spiral sleeve. The rotary cylinder block is provided with a piston body inside, and the piston body reciprocates inside the rotary cylinder block. The internal and external spiral sleeve is a sleeve structure with an open front end and a closed rear end, and the rear end of the internal and external spiral sleeve is fixed on the piston body. The inner wall at the open front end of the rotary cylinder block is an inner conical surface, and an internal gear ring is arranged in a matching manner at the inner conical surface. The rear end of the branch pipe body is fixed on the front end of the rotary cylinder block through a first hexagon socket head cap screw and presses the internal gear ring on the inner conical surface; the internal gear ring is annular, and a first spiral internal spline is arranged on the inner hole wall of the internal gear ring. Spiral external splines and spiral internal splines with opposite spiral directions are respectively arranged on the outer circle and inner hole of the internal and external spiral sleeve. The internal and external spiral sleeve is inserted into the inner hole of the internal gear ring, and the spiral external spline of the internal and external spiral sleeve is connected with the spiral internal spline of the internal gear ring in a matching manner; the rotary shaft is composed of a rotary shaft spiral shaft, a spiral shaft outer sleeve, and a rotary shaft hollow pipe. The rear end of the rotary shaft hollow pipe is fixedly provided with a spiral shaft outer sleeve. The front end of the spiral shaft outer sleeve is closed and the rear end is open. The rotary shaft spiral shaft is fixed inside the spiral shaft outer sleeve. The rotary shaft spiral shaft, the spiral shaft outer sleeve, and the rear part of the rotary shaft hollow pipe are all arranged inside the branch pipe body. An annular space is provided between the rotary shaft spiral shaft and the spiral shaft outer sleeve, and the internal and external spiral sleeve is inserted into this annular space. The spiral internal spline of the internal and external spiral sleeve is connected with the spiral external spline outside the rotary shaft spiral shaft in a matching manner, and the spiral shaft outer sleeve is fastened on the outside of the internal and external spiral sleeve through a support nut and a support bolt.

[0006] A piston guide ring and a piston combined seal are provided on the piston body. The piston guide ring guides the piston body, and the piston body divides the inner part of the rotary cylinder into left and right cavities. The piston combined seal is used for sealing to prevent the hydraulic oil in the left or right cavity of the rotary cylinder from overflowing into the adjacent cavity.

[0007] The rear end of the branch pipe body is pressed against the internal gear ring. An installation groove is provided on the inner wall of the rear end of the branch pipe body. A support nut is arranged in the installation groove. Thrust washers are provided between the support nut and the internal gear ring and between the support nut and the side wall of the installation groove. A support bolt penetrates through the support nut to fasten the outer sleeve of the spiral shaft on the outside of the inner and outer spiral sleeves.

[0008] An O-ring is provided on the outer wall of the branch pipe body, and the O-ring is located below a hexagon socket head cap screw; a branch pipe body seal and a branch pipe body guide ring are provided on the inner wall of the branch pipe body. The O-ring and the branch pipe body seal form an oil cylinder sealing space to seal the rotary cylinder. A rotary shaft guide ring is provided on the outer wall of the rotary shaft. The branch pipe body guide ring and the rotary shaft guide ring form the radial positioning of the rotary shaft.

[0009] A round nut and a round nut lock washer are provided at the front end of the branch pipe body. The round nut is annular and is arranged outside the rotary shaft. The round nut lock washer is arranged between the front end of the branch pipe body and the round nut. The setting of the round nut and the round nut lock washer can prevent the radial offset of the branch pipe body.

[0010] A plurality of hexagon socket head cap screws two are provided at the front end of the rotary shaft. The hexagon socket head cap screws two are installed and connected to relevant components and output rotational torque at the same time.

[0011] The outer ring of the internal gear ring is frustum-shaped and matches the inner conical surface.

[0012] The rear end of the inner and outer spiral sleeves is sealed by a sealing plug.

[0013] The spiral directions of the spiral external spline one of the inner and outer spiral sleeves and the spiral internal spline one of the internal gear ring are the same. The spiral external spline one and the spiral internal spline one cooperate to form a spiral spline pair one; the spiral directions of the spiral internal spline two of the inner and outer spiral sleeves and the spiral external spline two of the rotary shaft spiral shaft are the same. The spiral internal spline two and the spiral external spline two cooperate to form a spiral spline pair two; and because the spiral external spline one and the spiral internal spline two of the inner and outer spiral sleeves have opposite spiral directions, the spiral spline pair one and the spiral spline pair two are two spiral spline mating pairs with opposite helix directions.

[0014] A method for using a hydraulic screw drill arm, using the above-mentioned hydraulic screw drill arm, the steps are as follows: The piston body and the inner and outer screw sleeves form a piston. The piston makes a reciprocating motion under the push of hydraulic oil in the rotary cylinder block. Since the internal gear ring is fastened on the inner conical surface and cannot rotate, under the cooperation of the first helical spline pair, the piston makes a rotational motion while making a linear motion (similar to a lead screw mechanism). Since the first helical spline pair and the second helical spline pair have opposite helix directions, the rotary shaft makes a rotational motion in the same direction under the cooperation of the second helical spline pair.

[0015] The more specific steps are as follows:

[0016] ① When oil enters the right chamber of the rotary cylinder block, when the piston body moves linearly to the left, it drives the inner and outer screw sleeves to move to the left. Under the action of the first helical spline pair, a relative rotational motion is formed between the internal gear ring and the rotary shaft;

[0017] Because the internal gear ring is pressed and fixed on the inner conical surface of the rotary cylinder block, at this time, the inner and outer screw sleeves move to the left and also make a clockwise rotation; under the action of the second helical spline pair, the rotary shaft makes a synchronous clockwise rotation; the superposition of the two clockwise rotations forms a clockwise rotation output of the rotary shaft;

[0018] ② When oil enters the left chamber of the rotary cylinder block, when the piston body moves linearly to the right, it drives the inner and outer screw sleeves to move to the right. Under the action of the first helical spline pair, a relative rotational motion is formed between the internal gear ring and the rotary shaft;

[0019] Because the internal gear ring is pressed and fixed on the inner conical surface of the rotary cylinder block, the inner and outer screw sleeves make a counterclockwise rotation; under the action of the second helical spline pair, the rotary shaft makes a synchronous counterclockwise rotation; the superposition of the two counterclockwise rotations forms a counterclockwise rotation output of the rotary shaft;

[0020] Steps ① and ② form a rotational output of the rotary shaft relative to the rotary cylinder block.

[0021] The positive effects of the present invention: Strengthen the strength and stiffness of the root of the drill arm in the working state, and utilize the good stiffness of the hollow shaft to increase the stiffness of the drill arm, which is beneficial to increasing the stability of the working support environment of the hydraulic rock drill, and is also applicable to the tunnel construction environment with a small height dimension. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present invention;

[0023] Figure 2 is Figure 1 An enlarged schematic view of part A;

[0024] Figure 3 It is a schematic structural diagram of the piston of the present invention;

[0025] Figure 4Schematic diagram of the local structure of the rotating shaft of the present invention;

[0026] Figure 5 is Figure 1 Enlarged schematic diagram of part B;

[0027] In the figure: rotary cylinder block 1, piston guide ring 2, piston combined seal 3, O-ring 4, hexagon socket head cap screw one 5, branch pipe body 6, rotating shaft guide ring 7, round nut lock washer 8, round nut 9, hexagon socket head cap screw two 10, rotating shaft 11, rotating shaft spiral shaft 111, spiral shaft outer sleeve 112, rotating shaft hollow tube 113, dust seal 12, branch pipe body seal 13, branch pipe body guide ring 14, thrust washer 15, support nut 16, internal gear ring 17, piston body 18, internal and external spiral sleeve 19, sealing plug 20, linear cylinder pin 21, drill arm rotating pin 22. Specific embodiments

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] A hydraulic spiral drill arm includes a rotary cylinder block 1, a branch pipe body 6, a rotating shaft 11, an internal gear ring 17, a piston body 18 and an internal and external spiral sleeve 19. The piston body 18 is arranged in the rotary cylinder block 1 and makes reciprocating motion in the rotary cylinder block 1. The internal and external spiral sleeve 19 is a sleeve structure with an open front end and a closed rear end, and the rear end of the internal and external spiral sleeve 19 is fixed on the piston body 18. The inner wall of the front end opening of the rotary cylinder block 1 is an inner conical surface, and an internal gear ring 17 is arranged in a matching manner at the inner conical surface. The rear end of the branch pipe body 6 is fixed on the front end of the rotary cylinder block 1 through the hexagon socket head cap screw one 5, and the internal gear ring 17 is pressed on the inner conical surface; the internal gear ring 17 is annular, and a first spiral internal spline is arranged on the inner hole wall of the internal gear ring 17. Spiral external splines one and spiral internal splines two with opposite spiral directions are respectively arranged on the outer circle and inner hole of the internal and external spiral sleeve 19. The internal and external spiral sleeve 19 is inserted into the inner hole of the internal gear ring 17, and the spiral external spline one of the internal and external spiral sleeve 19 is in matching connection with the spiral internal spline one of the internal gear ring 17; the rotating shaft 11 is composed of a rotating shaft spiral shaft 111, a spiral shaft outer sleeve 112 and a rotating shaft hollow tube 113. The rear end of the rotating shaft hollow tube 113 is fixedly provided with a spiral shaft outer sleeve 112. The front end of the spiral shaft outer sleeve 112 is closed and the rear end is open. The rotating shaft spiral shaft 111 is fixed in the spiral shaft outer sleeve 112. The rear parts of the rotating shaft spiral shaft 111, the spiral shaft outer sleeve 112 and the rotating shaft hollow tube 113 are all arranged in the branch pipe body 6. An annular space is arranged between the rotating shaft spiral shaft 111 and the spiral shaft outer sleeve 112. The internal and external spiral sleeve 19 is inserted into this annular space, and the spiral internal spline two of the internal and external spiral sleeve 19 is in matching connection with the spiral external spline two outside the rotating shaft spiral shaft 111. The spiral shaft outer sleeve 112 is fastened on the outside of the internal and external spiral sleeve 19 through a support nut 16 and a support bolt.

[0030] A piston guide ring 2 and a piston combined seal 3 are provided on the piston body 18. The piston guide ring guides the piston body. The piston body divides the inner part of the rotary cylinder into left and right cavities. The piston combined seal is used for sealing to prevent the hydraulic oil in the left or right cavity of the rotary cylinder from overflowing into the adjacent cavity.

[0031] The rear end of the branch pipe body 6 is pressed against the internal gear ring 17. An installation groove is provided on the inner wall of the rear end of the branch pipe body 6. The support nut 16 is arranged in the installation groove. Thrust washers 15 are provided between the support nut 16 and the internal gear ring 17 and between the support nut 16 and the side wall of the installation groove. The support bolt passes through the support nut 16 to fasten the outer sleeve 112 of the spiral shaft to the outside of the internal and external spiral sleeve 19, for axially positioning the rotary shaft 11.

[0032] An O-ring 4 is provided between the branch pipe body 6 and the rotary cylinder 1, and the O-ring 4 is located below the first hexagon socket head cap screw 5; a branch pipe body seal 13 and a branch pipe body guide ring 14 are provided between the branch pipe body 6 and the outer sleeve 112 of the spiral shaft; a rotary shaft guide ring 7 is provided between the branch pipe body 6 and the hollow pipe 113 of the rotary shaft. The O-ring 4 and the branch pipe body seal 13 form an oil cylinder sealing space to seal the rotary cylinder. The branch pipe body guide ring 14 and the rotary shaft guide ring 7 radially position the rotary shaft 11.

[0033] The front end of the branch pipe body 6 is threadedly connected with a round nut 9 and a round nut lock washer 8. The round nut 9 is annular and is arranged outside the rotary shaft 11 to prevent the branch pipe body 6 from radially shifting.

[0034] A plurality of second hexagon socket head cap screws 10 are provided at the front end (output end) of the rotary shaft 11. The second hexagon socket head cap screws 10 are installed and connected to related components and output rotational torque at the same time.

[0035] The outer ring of the internal gear ring 17 is frustum-shaped matching the inner conical surface. The inner conical surface is in matching contact with the frustum-shaped outer ring of the internal gear ring 17. The inner conical surface cooperates with the branch pipe body 6 to axially position the internal gear ring 17.

[0036] The rear end of the internal and external spiral sleeve 19 is sealed by a sealing plug 20.

[0037] A using method of a hydraulic spiral drill arm, adopting the above hydraulic spiral drill arm, the steps are as follows: The piston body 18 and the internal and external spiral sleeve 19 form a piston. The piston makes a reciprocating motion in the rotary cylinder 1 under the push of hydraulic oil. Since the internal gear ring 17 is fastened on the inner conical surface and cannot rotate, under the cooperation of the first spiral spline pair, the piston makes a rotational motion while making a linear motion (similar to a lead screw mechanism). Since the first spiral spline pair and the second spiral spline pair have opposite helix directions, the rotary shaft 11 makes a rotational motion in the same direction under the cooperation of the second spiral spline pair.

[0038] Combined with the attached Figures 1-5 , in this embodiment:

[0039] The rotary cylinder block 1, piston, piston combined seal 3, branch pipe body 6, branch pipe body seal 13 and rotary shaft 11 together form the oil cylinder itself.

[0040] The piston is integrally welded by a piston body 18 and inner and outer spiral sleeves 19. The piston body 18 is installed in the rotary cylinder block 1, and a piston guide ring 2 and a piston combined seal 3 are installed on it. A right-handed external spline one is machined on the outer circle of the inner and outer spiral sleeves 19, a left-handed internal spline one is machined on the inner hole, a right-handed internal spline two is machined on the inner hole of the internal gear ring 17, and a left-handed external spline two is machined on the outer surface of the rotary shaft spiral shaft 111. The spiral directions of the spiral external spline one and the spiral internal spline one are the same and cooperate with each other to form a first spiral spline pair. The spiral directions of the spiral internal spline two and the spiral external spline two are the same and cooperate with each other to form a second spiral spline pair. And because the spiral directions of the spiral external spline one and the spiral internal spline two are opposite, the first spiral spline pair and the second spiral spline pair are two spiral spline pairs with opposite spiral directions.

[0041] The front end of the rotary cylinder block 1 is open, and the inner wall of the opening is an inner conical surface. The space enclosed by the inner conical surface is a frustum of a cone with a large front and a small rear, which is consistent with the outer shape of the internal gear ring 17. The internal gear ring 17 is pressed by the branch pipe body 6 with the first hexagon socket head cap screw 5 on the inner conical surface of the rotary cylinder block to form the axial and radial positioning of the internal gear ring 17 and is fastened by relying on friction. A right-handed internal spline one is machined on the inner hole of the internal gear ring 17.

[0042] The rotary shaft is welded by a rotary shaft spiral shaft 111, a spiral shaft outer sleeve 112 and a rotary shaft hollow tube 113. A left-handed external spline two is machined on the outer surface of the rotary shaft spiral shaft 111, and a plurality of threaded holes are provided along the circumferential direction on the rotary spiral shaft outer sleeve 112. An installation groove is provided on the inner wall at the rear end of the branch pipe body 6, a support nut 16 is arranged in the installation groove, thrust washers 15 are arranged between the support nut 16 and the internal gear ring 17 and between the support nut 16 and the side wall of the installation groove, and a support bolt is threadedly connected in the threaded holes of the support nut 16 and the rotary spiral shaft outer sleeve 112 to fasten the spiral shaft outer sleeve 112 on the outside of the inner and outer spiral sleeves 19 to perform axial positioning on the rotary shaft 11. An O-ring 4 and a branch pipe body seal 13 are installed on the branch pipe body 6 to form an oil cylinder sealing space to seal the rotary cylinder block 1 and prevent oil leakage. A branch pipe body guide ring 14 and a rotary shaft guide ring 7 are installed on the branch pipe body 6 to form the radial positioning of the rotary shaft. A plurality of second hexagon socket head cap screws 10 are provided at the rightmost end of the rotary shaft 11, and the second hexagon socket head cap screws 10 are responsible for the installation connection of relevant components and the output of rotational torque.

[0043] The specific working process of the present invention is as follows:

[0044] ① When the right chamber of the rotary cylinder block 1 is supplied with oil, when the piston body 18 moves linearly to the left, it drives the inner and outer spiral sleeves 19 to move to the left. Under the action of the first spiral spline pair, a relative rotational movement is formed between the internal gear ring 17 and the rotary shaft 11.

[0045] Since the internal gear ring 17 is pressed and fixed on the inner conical surface of the rotary cylinder block 1, at this time, while the inner and outer spiral sleeves 19 move to the left, they also rotate clockwise (viewed from the output end of the drill arm). Under the action of the second spiral spline pair, the rotary shaft 11 rotates clockwise synchronously relative to the internal gear ring 17 and the rotary cylinder block 1 (viewed from the output end of the drill arm). The superposition of the two clockwise rotations forms the clockwise rotation output of the rotary shaft 11 (viewed from the output end of the drill arm).

[0046] ② When the left chamber of the rotary cylinder block is supplied with oil, when the piston body 18 moves linearly to the right, it drives the inner and outer spiral sleeves 19 to move to the right. Under the action of the first spiral spline pair, a relative rotational movement is formed between the internal gear ring 17 and the rotary shaft 11.

[0047] Since the internal gear ring 17 is pressed and fixed on the rotary cylinder block 1, the inner and outer spiral sleeves 19 rotate counterclockwise (viewed from the output end of the drill arm). Under the action of the second spiral spline pair, the rotary shaft 11 rotates counterclockwise synchronously relative to the internal gear ring 17 and the rotary cylinder block 1 (viewed from the output end of the drill arm). The superposition of the two counterclockwise rotations forms the counterclockwise rotation output of the rotary shaft 11 (viewed from the output end of the drill arm).

[0048] Step ① and step ② form the rotational output of the rotary shaft 11 relative to the rotary cylinder block 1.

[0049] The present invention is suspended on the rotary pin 22 of the drill arm. The rotary pin 22 of the drill arm is arranged on the drill arm of the rock drilling jumbo. With the push of the linear cylinder pin 21 and an externally added linear cylinder, a pitching swing around the rotary pin of the drill arm is formed.

Claims

1. A hydraulic spiral drill arm, Characterized in that: It includes a rotary cylinder block (1), a branch pipe body (6), a rotary shaft (11), an internal gear ring (17), a piston body (18) and an internal and external spiral sleeve (19). A piston body (18) is arranged inside the rotary cylinder block (1), and the piston body (18) reciprocates inside the rotary cylinder block (1). The internal and external spiral sleeve (19) is a sleeve structure with an open front end and a closed rear end. The rear end of the internal and external spiral sleeve (19) is fixed on the piston body (18). The inner wall at the front end opening of the rotary cylinder block (1) is an inner conical surface, and an internal gear ring (17) is arranged in a matching manner at the inner conical surface. The rear end of the branch pipe body (6) is fixed on the front end of the rotary cylinder block (1) by a hexagon socket head cap screw one (5), and the internal gear ring (17) is pressed against the inner conical surface; the internal gear ring (17) is annular, and a first spiral internal spline is arranged on the inner hole wall of the internal gear ring (17). A first spiral external spline and a second spiral internal spline with opposite spiral directions are respectively arranged on the outer circle and the inner hole of the internal and external spiral sleeve (19). The internal and external spiral sleeve (19) is inserted into the inner hole of the internal gear ring (17), and the first spiral external spline of the internal and external spiral sleeve (19) is in matching connection with the first spiral internal spline of the internal gear ring (17); the rotary shaft (11) is composed of a rotary shaft spiral shaft (111), a spiral shaft outer sleeve (112) and a rotary shaft hollow tube (113). The rear end of the rotary shaft hollow tube (113) is fixedly provided with a spiral shaft outer sleeve (112). The front end of the spiral shaft outer sleeve (112) is closed and the rear end is open. The rotary shaft spiral shaft (111) is fixed inside the spiral shaft outer sleeve (112). The rear parts of the rotary shaft spiral shaft (111), the spiral shaft outer sleeve (112) and the rotary shaft hollow tube (113) are all arranged inside the branch pipe body (6). An annular space is arranged between the rotary shaft spiral shaft (111) and the spiral shaft outer sleeve (112). The internal and external spiral sleeve (19) is inserted into this annular space, and the second spiral internal spline of the internal and external spiral sleeve (19) is in matching connection with the second spiral external spline outside the rotary shaft spiral shaft (111). The spiral shaft outer sleeve (112) is fastened on the outside of the internal and external spiral sleeve (19) through a support nut (16) and a support bolt.

2. A hydraulic spiral drill arm according to claim 1, Characterized in that: A piston guide ring (2) and a piston combined seal (3) are arranged on the piston body (18).

3. A hydraulic spiral drill arm according to claim 1, Characterized in that: The rear end of the branch pipe body (6) is pressed against the internal gear ring (17). An installation groove is arranged on the inner wall at the rear end of the branch pipe body (6). The support nut (16) is arranged in the installation groove. Thrust washers (15) are arranged between the support nut (16) and the internal gear ring (17) and between the support nut (16) and the side wall of the installation groove. The support bolt penetrates through the support nut (16) to fasten the spiral shaft outer sleeve (112) on the outside of the internal and external spiral sleeve (19).

4. A hydraulic spiral drill arm according to claim 1 or 3, Characterized in that: An O-ring (4) is provided on the outer wall of the branch pipe body (6), and the O-ring (4) is located below the first hexagon socket head cap screw (5); a branch pipe body seal (13) and a branch pipe body guide ring (14) are provided on the inner wall of the branch pipe body (6).

5. A hydraulic drill arm according to claim 1 or 3, characterized in that: A rotary shaft guide ring (7) is provided on the outer wall of the rotary shaft (11).

6. A hydraulic drill arm according to claim 1 or 3, characterized in that: A round nut (9) and a round nut lock washer (8) are provided at the front end of the branch pipe body (6). The round nut (9) is annular and is arranged outside the rotary shaft (11). The round nut lock washer (8) is arranged between the front end of the branch pipe body (6) and the round nut (9).

7. A hydraulic drill arm according to claim 1 or 3, characterized in that: The spiral outer spline of the inner and outer spiral sleeve (19) and the spiral inner spline of the internal gear ring (17) have the same spiral direction, and the spiral outer spline and the spiral inner spline cooperate to form a first spiral spline pair; the spiral inner spline of the inner and outer spiral sleeve (19) and the spiral outer spline of the rotary shaft spiral shaft (111) have the same spiral direction, and the spiral inner spline and the spiral outer spline cooperate to form a second spiral spline pair; because the spiral outer spline and the spiral inner spline of the inner and outer spiral sleeve have opposite spiral directions, the first spiral spline pair and the second spiral spline pair are two spiral spline mating pairs with opposite helix directions.

8. A hydraulic drill arm according to claim 1 or 3, characterized in that: A plurality of second hexagon socket head cap screws (10) are provided at the front end of the rotary shaft (11).

9. A method for using a hydraulic drill arm, using the hydraulic drill arm according to claim 7, characterized in that: The piston body (18) and the inner and outer spiral sleeve (19) form a piston. The piston makes a reciprocating motion under the push of hydraulic oil in the rotary cylinder block (1). Since the internal gear ring (17) is fastened on the inner conical surface and cannot rotate, under the cooperation of the first spiral spline pair, the piston makes a rotational motion while making a linear motion. Since the first spiral spline pair and the second spiral spline pair have opposite helix directions, the rotary shaft (11) makes a rotational motion in the same direction under the cooperation of the second spiral spline pair.

10. A method for using a hydraulic drill arm according to claim 8, characterized in that the specific steps are as follows: ① When oil enters the right chamber of the rotary cylinder block (1), when the piston body (18) moves linearly to the left, it drives the inner and outer spiral sleeve (19) to move to the left. Under the action of the first spiral spline pair, a relative rotational motion is formed between the internal gear ring (17) and the rotary shaft (11); Because the internal gear ring (17) is pressed and fixed on the inner conical surface of the rotary cylinder block (1), at this time, the inner and outer spiral sleeve (19) moves to the left and also rotates clockwise; under the action of the second spiral spline pair, the rotary shaft (11) rotates clockwise synchronously; the superposition of the two clockwise rotations forms the clockwise rotation output of the rotary shaft (11). ② When the left chamber of the rotary cylinder block is supplied with oil, when the piston body (18) moves linearly to the right, it drives the inner and outer spiral sleeves (19) to move to the right. Under the action of the first spiral spline pair, a relative rotational movement is formed between the internal gear ring (17) and the rotary shaft (11); Since the internal gear ring (17) is pressed and fixed on the inner conical surface of the rotary cylinder block (1), the inner and outer spiral sleeves (19) rotate counterclockwise; under the action of the second spiral spline pair, the rotary shaft (11) rotates counterclockwise synchronously; the superposition of the two counterclockwise rotations forms the counterclockwise rotational output of the rotary shaft (11); Step ① and step ② form the rotational output of the rotary shaft (11) relative to the rotary cylinder block (1).

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