CN117449751A - Drilling machine and hydraulic system thereof - Google Patents

Abstract

The application belongs to the field of hydraulic control, and particularly relates to a drilling machine and a hydraulic system thereof. The application discloses a drilling machine, which comprises a drill rod, a clamping device and a hydraulic system; the hydraulic system comprises an oil tank and a hydraulic motor; the clamping device comprises a clamping oil cylinder, and the hydraulic system further comprises a safety oil way; the safety oil way comprises a control valve group, and is provided with a first oil port, a second oil port and a third oil port; the control valve group is hydraulically connected to the oil tank through a first oil port, is hydraulically connected to the hydraulic motor through a second oil port and is hydraulically connected to the clamping oil cylinder through a third oil port; the control valve group comprises a first on-off valve. The drilling machine has the beneficial effects that the drilling machine and the hydraulic system thereof, wherein the hydraulic motor reduces the power for lifting the drill rod when the clamping device is in the clamping state and the pushing device is in the pushing or resting state.

Description

Drilling machine and hydraulic system thereof

Technical Field

The application belongs to the field of hydraulic control, and particularly relates to a drilling machine and a hydraulic system thereof.

Background

The surface core drilling machine is mainly applied to geological exploration and is widely applied to industries such as construction, mine and the like. Referring to fig. 1 and 2 of the drawings of the specification, a prior art drilling machine comprises a mast, a drill rod, a rotary head, a clamping device, a propelling device and a winch. In the drilling process, one end of the mast, which is close to the ground, is a near ground end, and one end of the mast, which is far away from the ground, is a far ground end. The rotary head and the mast form sliding connection along the length extension direction of the mast, the clamping device is fixedly connected in the rotary head or is formed in the rotary head, the clamping device comprises two chucks which can be mutually close to or far away from each other, when a drill rod passes through a space between the two chucks, if the two chucks are mutually close to each other, the clamping device clamps the drill rod, and then the rotary head and the drill rod are mutually clamped; if the two chucks are far away from each other, the clamping device loosens the drill rod, so that the rotary head and the drill rod are separated from each other.

The pushing device is positioned between the rotary head and the remote end of the mast, the pushing device comprises a pushing oil cylinder, a piston cylinder of the pushing oil cylinder is fixedly connected to the rotary head, when a piston rod of the pushing oil cylinder and the piston cylinder slide relatively, the pushing device can drive the rotary head to slide relatively to the mast, and if the clamping device clamps the drill rod, the pushing device can drive the drill rod to advance and retreat when controlling the rotary head to slide.

The hoist engine includes hydraulic motor, spool and wire rope, and hydraulic motor carries out corotation or reversal for the spool and provides power, and wire rope and the one end fixed connection of spool, wire rope's the other end can be dismantled and be connected to the one end that the drilling rod kept away from ground to the drilling rod produces pulling force and then realizes the promotion to the drilling rod under non-drilling state.

In the use process of the drilling machine, the normal drilling speed is very low, so that under the non-drilling working conditions such as rod replacement, many users can not return the control rod of the propulsion device to the middle position to stop propulsion, in other words, the piston and the piston rod of the propulsion oil cylinder still keep the current relative positions under the pressure of hydraulic oil. In the case of normal operation, if the user wants to operate the hoist to lift the drill rod, the clamping device should be controlled to release the drill rod, i.e. to control the two chucks to be away from each other, and then to separate the turret from the drill rod.

However, in the actual operation, when the user operates the main hoist to lift the drill rod, there may be a case where the user forgets to release the clamping device, and at this time, the clamping device clamps the drill rod, and the rotary head and the drill rod are clamped with each other. In this case, the user operates the wire rope of the hoist to lift the drill pipe, which causes the turret to be lifted simultaneously by the hoist, and because the piston cylinder of the thrust cylinder is fixedly connected to the turret, the piston cylinder of the thrust cylinder passively slides in a distal direction close to the mast, which causes a vacuum to be formed in the piston cylinder, generating a negative pressure, regardless of whether the thrust device is in a thrust or stationary state. If the pushing oil cylinder is not returned to the middle position and is in a static state at the moment, but is in a pushing state continuously, the negative pressure formed in the pushing oil cylinder is larger, and when a user stops operating the main winch, the rotary head can fall down out of control and quickly under the action of gravity and the pressure difference in the pushing oil cylinder, so that safety accidents can be caused, and the safety hazard is high.

In the related art, the chinese patent document CN102515049B provides a technical solution that can improve the working efficiency of the main winch during normal operation, reduce the lowering speed of the main winch under the condition of easy impact, avoid damage to the drilling tool, and prolong the service life of the drilling tool. The related art does not give any technical teaching for solving the problem that the main winch lifts the drill rod while lifting the rotary head, so that the rotary head is out of control and falls down quickly under the action of gravity.

Disclosure of Invention

The content of the present application is intended to introduce concepts in a simplified form that are further described below in the detailed description. The section of this application is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

1. Technical problems:

the invention aims to solve the technical problems that: the utility model provides a rig and hydraulic system thereof can prevent among the prior art, when the main hoist of rig operation mentioned drilling rod and clamping device do not loosen, can mention the piston cylinder of revolving head and thrust cylinder simultaneously, leads to forming vacuum in the piston cylinder, produces the negative pressure, and after the user stopped operating main hoist, the revolving head can be under the problem of the out of control quick whereabouts of gravity and thrust cylinder inside pressure differential's effect.

2. The technical scheme is as follows:

in order to solve the technical problems mentioned in the background art, as a first aspect of the present application, the present application provides a drilling machine comprising a drill rod, a clamping device and a hydraulic system; the hydraulic system comprises an oil tank and a hydraulic motor; the clamping device comprises a clamping oil cylinder and at least comprises a clamping state for clamping the drill rod and a loosening state for releasing the drill rod; the hydraulic system further includes: the safety oil way is used for enabling the hydraulic motor to reduce the power for lifting the drill rod when the clamping device is in a clamping state; the safety oil way comprises a control valve group, and is provided with a first oil port, a second oil port and a third oil port; the control valve group is hydraulically connected to the oil tank through a first oil port; the control valve group is hydraulically connected to the hydraulic motor through a second oil port; the control valve group is hydraulically connected to the clamping cylinder through a third oil port; the control valve group comprises a first on-off valve which is arranged between an oil inlet of the hydraulic motor and the oil tank; the first on-off valve is provided with a first oil inlet, a first oil outlet and a first control oil port; the first oil inlet is hydraulically connected to the second oil port; the first oil outlet is hydraulically connected to the first oil port; the first control port is hydraulically connected to the third port.

Further, the first on-off valve is configured as a reversing valve.

Further, the reversing valve is configured as a two-position two-way reversing valve.

Further, the control valve group further comprises:

the pressure control valve is arranged between the first on-off valve and an oil inlet of the hydraulic motor.

Further, the pressure control valve is configured as a relief valve.

Further, the control valve group further comprises a second break-make valve arranged between the pressure control valve and an oil inlet of the hydraulic motor.

Further, the second on-off valve is configured as a solenoid valve.

Further, the hydraulic system also comprises a propulsion device which at least has a propulsion state for making the drill rod advance and a retreating state for making the drill rod retreat;

the propulsion device comprises:

the propulsion oil cylinder is used for driving the propulsion device to be kept in a propulsion state or a retreating state;

the control valve group also comprises a pressure selection valve which is positioned between the second oil port and the first on-off valve;

the pressure selection valve is hydraulically connected to the thrust cylinder.

Further, the pressure selection valve is configured as a shuttle valve.

As a second aspect of the present application, the present application provides a hydraulic system, which is the aforementioned hydraulic system.

3. The beneficial effects are that:

the beneficial effects of this application lie in:

the hydraulic system of the drilling machine comprises a control valve group, a first oil port, a second oil port and a third oil port; the control valve group is hydraulically connected to the oil tank through a first oil port; the control valve group is hydraulically connected to the hydraulic motor through a second oil port; the control valve group is hydraulically connected to the clamping cylinder through a third oil port; the control valve group comprises a first on-off valve and is arranged between an oil inlet of the hydraulic motor and the oil tank. When a user operates the hydraulic motor to lift the drill rod, the control valve group can automatically judge whether the clamping device is opened, and if the clamping device is opened, the hydraulic motor can lift the drill rod normally. If the clamping device is not opened, the first on-off valve in the control valve group can control the pressure of the working oil way of the hydraulic motor to be within a preset threshold value, and further control the lifting force of the hydraulic motor to the drill rod to be limited within the preset threshold value, so that the hydraulic motor can not lift the drill rod and the rotary head on the drilling machine at the same time. Therefore, even if a user starts the hydraulic motor to lift the drill rod without loosening the clamping device, the hydraulic motor cannot lift the rotary head at the same time, so that the risk of uncontrolled and rapid sliding of the rotary head after being lifted is avoided.

The hydraulic system in the drilling machine comprises a second on-off valve, and the second on-off valve is arranged between the pressure control valve and an oil inlet of the hydraulic motor. Because the drill rod of a part model is special in appearance, the diameter of the part of the drill rod below the clamping device is larger than the inner diameter of the clamping device in a loose rod state, and the rotary head slides out of the working position of the drill rod at the moment. In this special working situation, since the rotary head has slipped out of the working position of the drill rod, there is no danger that the rotary head and the drill rod are lifted simultaneously, and the gripping device is in either the loose rod state or the clamped state without danger. At the moment, the third oil inlet and the third oil outlet of the second on-off valve are disconnected, so that the control valve group loses the limitation on the lifting force of the hydraulic motor, and the requirement of the special situation is met.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application.

The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.

In the drawings:

FIG. 1 is a schematic view of the overall structure of the drilling machine of the present application;

FIG. 2 is a schematic diagram illustrating a connection relationship between a turret and a clamping device;

FIG. 3 is a schematic illustration of the connection between the various parts of the hydraulic system of the present application;

FIG. 4 is a simplified diagram of the connection of some of the structures in the hydraulic system of the present application;

FIG. 5 is a schematic diagram of the connection between the various parts of the control valve block of the present application, and showing the working state of the control valve block when the clamping device is in the clamped state and the propulsion device is in the propelled state or the propulsion is stopped;

fig. 6 is a schematic structural view of the first on-off valve in fig. 5, mainly illustrating the structure of the first oil inlet and the like;

FIG. 7 is a schematic structural view of the pressure control valve in FIG. 5, mainly illustrating the structure of the second oil inlet and the like;

FIG. 8 is a schematic structural view of the second on-off valve in FIG. 5, mainly illustrating the structure of the third oil inlet and the like;

FIG. 9 is a schematic structural view of the pressure selector valve in FIG. 5, mainly illustrating a fourth oil inlet and so on;

FIG. 10 is a schematic view of the control valve set of FIG. 5 in an open lever state;

FIG. 11 is a schematic view of the valve block of FIG. 5 in operation with the clamping device in a clamped state and the propulsion device in a retracted state;

FIG. 12 is a schematic view of the valve block of FIG. 5 in operation with the rotary head slid out of the drill pipe operating position;

fig. 13 is a schematic view of the turret head of fig. 2 slid out of the working position of the drill pipe.

Meaning of reference numerals:

100. a drilling machine; 101. a drill rod; 102. a rotary head; 103. a mast;

200. a hydraulic system; 210. an oil tank; 220. a hydraulic pump; 230. a hydraulic motor; 240. a clamping device; 241. clamping an oil cylinder; 250. a control valve group; 251. a first oil port; 252. a second oil port; 253. a third oil port; 254. a first on-off valve; 254a, a first oil inlet; 254b, a first oil outlet; 254c, a first control oil port; 254d, a return spring; 255. a pressure control valve; 255a, a second oil inlet; 255b, a second oil outlet; 255c, an adjusting spring; 256. a second on-off valve; 256a, a third oil inlet; 256b, a third oil outlet; 257. a pressure selection valve; 257a, a fourth oil inlet; 257b, fifth oil inlet; 257c, a fourth oil outlet;

260. a propulsion device; 261. pushing the oil cylinder.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be further noted that, for convenience of description, only a portion related to the present invention is shown in the drawings. Features in embodiments of the present disclosure may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 to 13, a drilling machine 100 is provided in this embodiment. The rig 100 includes a drill pipe 101, a gripping device 240 and a turret head 102, a mast 103, and a hydraulic system 200. Wherein hydraulic system 200 is used to raise drill pipe 101. The hydraulic system 200 includes an oil tank 210, a hydraulic pump 220, a hydraulic motor 230, and a relief oil passage. The oil tank 210 is used for storing hydraulic oil. The hydraulic pump 220 is hydraulically connected to the oil tank 210. The hydraulic motor 230 is hydraulically connected to the hydraulic pump 220. Hydraulic motor 230 is used to provide power to raise drill pipe 101. The clamping device 240 is formed or fixedly connected to the turret head 102. Clamping device 240 has at least a clamped state clamping drill pipe 101 and a loose state releasing drill pipe 101. The clamping device 240 comprises a clamping cylinder 241, which clamping cylinder 241 is used for driving the clamping device 240 to be kept in a clamped state or a loose rod state. The safety oil path is used for enabling the hydraulic motor 230 to reduce the power for lifting the drill rod 101 when the clamping device 240 is in a clamping state; the safety oil path comprises a control valve group 250; the control valve group 250 has a first port 251, a second port 252, and a third port 253. The control valve group 250 is hydraulically connected to the tank 210 through a first port 251. The control valve block 250 is hydraulically connected to the hydraulic motor 230 via a second port 252. The control valve block 250 is hydraulically connected to the clamping cylinder 241 through a third port 253. The specific connection between the various parts of the drill 100 will be described in detail later.

More specifically, referring to fig. 1 and 2, the drilling machine 100 in this embodiment further includes a winch, which includes the aforementioned hydraulic motor 230, a reel, and a wire rope, wherein the hydraulic motor 230 provides power for forward rotation or reverse rotation of the reel, the wire rope is fixedly connected to one end of the reel, and the other end of the wire rope is detachably connected to one end of the drill pipe 101 far away from the ground, so that the drill pipe 101 generates a pulling force in a non-drilling state to thereby lift the drill pipe 101.

During drilling, the end of mast 103 near the ground is the near ground end and the end remote from the ground is the far ground end. The turret head 102 and the mast 103 form a sliding connection along the length extension direction of the mast 103, and a clamping device 240 is fixedly connected or formed in the turret head 102, wherein the clamping device 240 comprises two chucks which can be mutually close to or far from each other.

With the above technical solution, when the user operates the hydraulic motor 230 to lift the drill pipe 101, the control valve group 250 will automatically determine whether the clamping device 240 is opened, and if the clamping device 240 is opened, the hydraulic motor 230 can lift the drill pipe 101 normally. If clamping device 240 is not open, control valve assembly 250 can control the lifting force of hydraulic motor 230 to be limited within a preset threshold while drill pipe 101 is still clamped on clamping device 240 such that hydraulic motor 230 cannot lift drill pipe 101 and rotary head 102 on drilling machine 100 at the same time. In this way, even if the user activates hydraulic motor 230 to lift drill pipe 101 without releasing gripping device 240, hydraulic motor 230 cannot lift rotary head 102 at the same time, thereby avoiding the risk of uncontrolled and rapid slip of rotary head 102 after it is lifted.

Specifically, referring to fig. 5 and 6, the control valve group 250 includes a first on-off valve 254, and the first on-off valve 254 is disposed between an oil inlet of the hydraulic motor 230 and the oil tank 210. The first on-off valve 254 has a first oil inlet 254a, a first oil outlet 254b, and a first control oil port 254c. The first oil inlet 254a is hydraulically connected to the second oil port 252. The first oil outlet 254b is hydraulically connected to the first oil port 251. The first control port 254c is hydraulically connected to the third port 253. In the present embodiment, the first on-off valve 254 is configured as a two-position two-way directional valve.

With the above technical solution, the first control oil port 254c of the first on-off valve 254 is connected to the third oil port 253. And the third port 253 communicates with the clamp cylinder 241. When the pressure of the oil path where the clamping cylinder 241 is located changes, the on-off condition of the first on-off valve 254 will also change accordingly. In this embodiment, if the clamping device 240 is in the loose rod state, since the first oil inlet 254a and the first oil outlet 254b of the first on-off valve 254 are communicated, hydraulic oil flows from the first oil inlet 254a to the first oil outlet 254b to release pressure in the oil path where the hydraulic motor 230 is located, so that the lifting force of the hydraulic motor 230 is reduced, and the drill rod 101 and the rotary head 102 of the drilling machine 100 cannot be lifted at the same time. If the clamping device 240 is in the loose rod state, the first oil inlet 254a and the first oil outlet 254b of the first on-off valve 254 are disconnected, and the hydraulic motor 230 can work normally to lift the drill rod 101.

More specifically, referring to fig. 6, a two-position two-way reversing valve is fixedly connected or formed with a return spring 254d.

By adopting the above technical scheme, when the first control oil port 254c of the two-position two-way reversing valve is depressurized, which means that the clamping device 240 is in a loose lever state, the return spring 254d generates elastic force to the valve core of the two-position two-way reversing valve, so that the valve core is maintained at a position where the first oil inlet 254a and the first oil outlet 254b are communicated, and further the pressure of the oil path where the hydraulic motor 230 is located is controlled. In addition, when the first control oil port 254c is changed from the loading state to the pressure relief state, the spool of the two-position two-way reversing valve can be restored to the position where the first oil inlet 254a and the first oil outlet 254b are communicated from the state where the first oil inlet 254a and the first oil outlet 254b are disconnected by the elastic force of the return spring 254d.

It should be noted that the two-position two-way reversing valve is only an alternative embodiment of the first on-off valve 254, and the first on-off valve 254 may be other hydraulic valves that perform the same function as the two-position two-tub reversing valve in the present embodiment.

More specifically, referring to fig. 5 and 7, the control valve block 250 further includes a pressure control valve 255, and the pressure control valve 255 is disposed between the first on-off valve 254 and the oil inlet of the hydraulic motor 230. The pressure control valve 255 is provided with a second oil inlet 255a and a second oil outlet 255b. Wherein the second oil inlet 255a is hydraulically connected to the second oil port 252. The second oil outlet 255b is hydraulically connected to the first oil inlet 254a of the first on-off valve 254. In the present embodiment, the pressure control valve 255 is configured as a relief valve.

With the above technical solution, when the user operates the hydraulic motor 230 to lift the drill pipe 101, if the clamping device 240 is in a clamped state, the first oil inlet 254a and the first oil outlet 254b of the two-position two-way reversing valve are in a communicating state, the pressure value of the oil path in which the hydraulic motor 230 is located is controlled by the relief valve, and when the hydraulic oil pressure of the oil path in which the hydraulic motor 230 is located exceeds the set pressure of the relief valve, the second oil inlet 255a and the second oil outlet 255b of the relief valve are communicated, and hydraulic oil flows from the second oil inlet 255a to the second oil outlet 255b. In this way, the relief valve protects hydraulic motor 230 from overload, so that the pressure of the oil line where the relief valve is located is not increased any more, and thus the lifting force of hydraulic motor 230 when lifting drill pipe 101 is controlled. In this embodiment, the set pressure of the overflow valve is only capable of lifting the drill rod 101 but not both the drill rod 101 and the clamping device 240 clamping the drill rod 101 and the rotary head 102 containing or fixedly connected to the clamping device 240. In this way, not only is it avoided that the gripping device 240 is in a clamped state, wherein the device lifts the drill rod 101, the gripping device 240 and the swivel 102 simultaneously.

More specifically, the relief valve is formed or fixedly connected with an adjusting spring 255c to adjust a set pressure value of the relief valve by adjusting a precompression amount of the adjusting spring 255 c.

With the above technical solution, when the hydraulic motor 230 needs to lift the drill pipes 101 of different types, the pre-compression amount of the adjusting spring 255c of the overflow valve can be adjusted to change the set pressure of the overflow valve due to the self-gravity of the drill pipes 101, so that the set pressure of the overflow valve can be adjusted to the maximum rod weight covering the drill pipes 101.

More specifically, referring to fig. 5 and 8, the control valve block 250 further includes a second on-off valve 256, and the second on-off valve 256 is disposed between the pressure control valve 255 and an oil inlet of the hydraulic motor 230. The second on-off valve 256 is provided with a third oil inlet 256a and a third oil outlet 256b. Wherein, the third oil inlet 256a is connected to the second oil port 252. The third oil outlet 256b communicates to a second oil inlet 255a of the pressure control valve 255. In the present embodiment, the second on-off valve 256 is configured as a solenoid valve.

In this embodiment, the drilling machine 100 further comprises a sliding device, which is located between the mast 103 and the rotary head 102, and when the drill rod 101 needs to slide out of the clamping device 240, the sliding device controls the rotary head 102 and the drill rod 101 to move relatively, so that the rotary head 102 slides out of the working position of the drill rod 101. In this embodiment, the slip means are not shown in the drawings.

With the above technical solution, referring to fig. 12, since the drill pipe 101 of a partial model has a special shape, the diameter of the portion of the drill pipe 101 below the clamping device 240 is larger than the inner diameter of the clamping device 240 in the loose state, and the rotary head 102 needs to slide out of the working position of the drill pipe 101. In this special working situation, referring to fig. 13, since the rotary head 102 slides out of the working position of the drill pipe 101, there is no danger that the rotary head 102 and the drill pipe 101 are lifted simultaneously, and at this time, the third oil inlet 256a and the third oil outlet 256b of the second break valve 256 are disconnected, so that the control valve group 250 loses the limitation on the lifting force of the hydraulic motor 230, and the control valve group 250 does not function.

More specifically, referring to fig. 1 and 3, hydraulic system 200 also includes a propulsion device 260, where propulsion device 260 has at least a propulsion state to advance drill pipe 101 and a retraction state to retract drill pipe 101. Wherein the propulsion device 260 comprises a propulsion cylinder 261 for driving the propulsion device 260 to maintain a propulsion state or a retreating state.

More specifically, referring to fig. 5 and 9, the control valve block 250 further includes a pressure selection valve 257, the pressure selection valve 257 being located between the second oil port 252 and the first on-off valve 254. The pressure selector valve 257 is hydraulically connected to the thrust cylinder 261. The pressure selecting valve 257 is provided with a fourth oil inlet 257a, a fifth oil inlet 257b, and a fourth oil outlet 257c. The fourth oil inlet 257a is connected to the third oil port 253. The fifth oil inlet 257b is hydraulically connected to the push cylinder 261. The fourth oil outlet 257c is hydraulically connected to the first control port 254c of the first on-off valve 254. In the present embodiment, the pressure selecting valve 257 is configured as a shuttle valve.

In this embodiment, if there is pressure at both ends of the shuttle valve, the pressure at the end of the shuttle valve connected to the clamping device 240 is greater than the pressure at the end of the shuttle valve connected to the pushing device 260, that is, as long as the clamping device 240 is in the loose rod state, no matter what state the pushing device 260 is in, the open circle in the schematic diagram of the shuttle valve is located at the right end.

That is, only when both ends of the shuttle valve are in the pressure relief state, the first oil inlet 254a and the first oil outlet 254b of the first on-off valve 254 are communicated, that is, the clamping device 240 is in the clamping state, and the pushing device 260 is in the pushing state or stops pushing state.

In this embodiment, the pushing device 260 is located between the rotary head 102 and the distal end of the mast 103, the pushing device 260 includes a pushing cylinder 261, a piston cylinder of the pushing cylinder 261 is fixedly connected to the rotary head 102, when a piston rod of the pushing cylinder 261 slides relatively to the piston cylinder, the pushing device 260 can drive the rotary head 102 to slide relatively to the mast 103, and if the clamping device 240 clamps the drill rod 101, the pushing device 260 can drive the drill rod 101 to advance and retract when controlling the rotary head 102 to slide.

With the above technical solution, referring to fig. 5, the connection of the fourth oil inlet 257a of the pressure selection valve 257 to the third oil port 253 of the control valve group 250 means that the pressure state of the fourth oil inlet 257a is the same as that of the third oil port 253, that is, the pressure of the oil path where the clamping cylinder 241 is located, and meanwhile, the fifth oil inlet 257b of the pressure selection valve 257 is connected to the oil path where the pushing cylinder 261 is located, when the clamping device 240 is in a clamped state and the pushing cylinder 261 is in a pushed state or is stationary, both the fourth oil inlet 257a and the fifth oil inlet 257b of the pressure selection valve 257 are in a pressure relief state, the fourth oil outlet 257c is also in a pressure relief state, and the lifting force of the hydraulic motor 230 is limited by the pressure set by the pressure control valve 255, so as to ensure that the hydraulic motor 230 does not lift the drill pipe 101 and the clamping device 240 and the rotary head 102 including the clamping device 240 at the same time.

Referring to fig. 10, when clamping device 240 is in the loose rod state, and drill pipe 101 is separated from rotary head 102, this eliminates the danger of the rotary head 102 falling down quickly after being lifted, and the lifting force of hydraulic motor 230 is not limited by control valve group 250, because the space between first oil inlet 254a and first oil outlet 254b of first on-off valve 254 is cut off. Thus, as long as the clamping device 240 is in the loose lever state, the control valve group 250 loses the restriction on the lifting force of the hydraulic motor 230 regardless of whether the push cylinder 261 is in the push-in or push-out state.

Referring to fig. 11, when clamping device 240 is in a clamped state, but pushing ram 261 is in a retracted state, which means that a user has operated drilling machine 100 to be in a non-drilling state, fourth oil inlet 257a is in a pressure relief state, and fifth oil inlet 257b is in a loading state, so that the lifting force of hydraulic motor 230 is not limited by control valve group 250, drill pipe 101 can be lifted normally, although clamping device 240 and turret 102 may be lifted at the same time, because pushing ram 261 is in a retracted state, when hydraulic motor 230 loses the lifting force after lifting drill pipe 101 to a preset height, turret 102 is controlled by pushing ram 261, and the danger of rapid falling does not occur.

It is noted that by hydraulic connection in this application is meant that hydraulic oil can flow between hydraulically connected hydraulic components.

The present application is described in detail hereinabove in connection with specific exemplary embodiments. It will be understood that various modifications and variations may be made without departing from the scope of the application, which is defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the present application described herein. Furthermore, the background is intended to illustrate the status and meaning of the development of the present technology and is not intended to limit the application or application fields of the present application and the present application.

More specifically, although exemplary embodiments of the present application have been described herein, the present application is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the application is, therefore, indicated by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims (10)

1. A drilling machine comprises a drill rod, a clamping device and a hydraulic system; the hydraulic system comprises an oil tank and a hydraulic motor; the clamping device comprises a clamping oil cylinder and at least has a clamping state for clamping the drill rod and a loose rod state for releasing the drill rod; the method is characterized in that: the hydraulic system further includes:

a safety oil path for causing the hydraulic motor to reduce power for lifting the drill rod when the clamping device is in the clamped state; the safety oil way comprises a control valve group, and is provided with a first oil port, a second oil port and a third oil port; the control valve group is hydraulically connected to the oil tank through the first oil port; the control valve group is hydraulically connected to the hydraulic motor through the second oil port; the control valve group is hydraulically connected to the clamping oil cylinder through the third oil port;

the control valve group comprises a first on-off valve and is arranged between an oil inlet of the hydraulic motor and the oil tank; the first on-off valve is provided with a first oil inlet, a first oil outlet and a first control oil port; the first oil inlet is hydraulically connected to the second oil port; the first oil outlet is hydraulically connected to the first oil port; the first control port is hydraulically connected to the third port.

2. The drilling machine of claim 1, wherein:

the first on-off valve is configured as a reversing valve.

3. The drilling machine of claim 2, wherein:

the reversing valve is configured as a two-position two-way reversing valve.

4. A drilling machine according to claim 3, characterized in that:

the control valve block further comprises:

the pressure control valve is arranged between the first on-off valve and the oil inlet of the hydraulic motor.

5. The drilling machine of claim 4, wherein:

the pressure control valve is configured as a relief valve.

6. The drilling machine of claim 5, wherein:

the control valve group further comprises a second on-off valve which is arranged between the pressure control valve and an oil inlet of the hydraulic motor.

7. The drilling machine of claim 6, wherein:

the second on-off valve is configured as a solenoid valve.

8. The drilling machine according to any one of claims 1 to 7, characterized in that:

the hydraulic system further comprises a propulsion device having at least a propulsion state for advancing the drill rod and a retraction state for retracting the drill rod;

the propulsion device comprises:

a propulsion cylinder for driving the propulsion device to remain in the propulsion state or the retreating state;

the control valve group further comprises a pressure selection valve, and the pressure selection valve is positioned between the second oil port and the first on-off valve; the pressure selection valve is hydraulically connected to the thrust cylinder.

9. The drilling machine of claim 8, wherein:

the pressure selection valve is configured as a shuttle valve.

10. A hydraulic system, characterized by:

the hydraulic system is the hydraulic system according to any one of claims 1 to 9.