阅读说明：本技术 一种防溶洞卡钎的液压系统和凿岩台车 (Hydraulic system for preventing drill rod from being stuck in solution cavity and rock drilling trolley ) 是由 刘飞香 程永亮 刘伟 康磊 柳得帅 张玉良 曾庆峰 胡鑫乐 于 2021-08-03 设计创作，主要内容包括：本申请公开了一种防溶洞卡钎的液压系统和凿岩台车,防溶洞卡钎的液压系统包括推进油缸,推进油缸的有杆腔和无杆腔两者和换向阀连通,无杆腔和换向阀之间的油路上串联有液控比例节流阀和节流阀,节流阀两端并联有液控比例换向阀,液控比例换向阀还连接液控比例节流阀和第一控制油路,液控比例换向阀包括第一工作位和第二工作位；当液控比例换向阀位于第一工作位时,液控比例换向阀将第一控制油路和液控比例节流阀断开,液控比例节流阀的阀口开度大；当液控比例换向阀逐渐向第二工作位移动时,液控比例换向阀将第一控制油路和液控比例节流阀连通,第一控制油路中的油液推动液控比例节流阀进行换向,以使液控比例节流阀的阀口开度发生变化。(The application discloses a hydraulic system for preventing a drill rod from being stuck in a karst cave and a drill jumbo, wherein the hydraulic system for preventing the drill rod from being stuck in the karst cave comprises a propulsion oil cylinder, a rod cavity and a rodless cavity of the propulsion oil cylinder are communicated with a reversing valve, a hydraulic control proportional throttle valve and a throttle valve are connected in series on an oil path between the rodless cavity and the reversing valve, two ends of the throttle valve are connected in parallel with a hydraulic control proportional reversing valve, the hydraulic control proportional reversing valve is also connected with the hydraulic control proportional throttle valve and a first control oil path, and the hydraulic control proportional reversing valve comprises a first working position and a second working position; when the hydraulic control proportional reversing valve is located at the first working position, the hydraulic control proportional reversing valve disconnects the first control oil path and the hydraulic control proportional throttle valve, and the opening degree of a valve port of the hydraulic control proportional throttle valve is large; when the hydraulic control proportional reversing valve gradually moves to the second working position, the hydraulic control proportional reversing valve communicates the first control oil path with the hydraulic control proportional throttle valve, and oil in the first control oil path pushes the hydraulic control proportional throttle valve to reverse, so that the opening degree of a valve port of the hydraulic control proportional throttle valve changes.)

1. A hydraulic system for preventing a drill rod from being stuck in a karst cave comprises a propulsion oil cylinder (10), wherein a rod cavity and a rodless cavity of the propulsion oil cylinder (10) are communicated with a reversing valve (4), it is characterized in that a hydraulic control proportional throttle valve (5) and a throttle valve (8) are connected in series on an oil path between the rodless cavity and the reversing valve (4), two ends of the throttle valve (8) are connected in parallel with a hydraulic control proportional reversing valve (7), the hydraulic control proportional reversing valve (7) is also connected with the hydraulic control proportional throttle valve (5) and a first control oil way, the hydraulic control proportional reversing valve (7) comprises a first working position and a second working position, the working position of the hydraulic control proportional reversing valve (7) can be changed through the pressure difference change at the two ends of the throttle valve (8), so that the hydraulic control proportional directional valve (7) is positioned at a first working position, a second working position and any position between the two working positions;

when the hydraulic control proportional reversing valve (7) is located at a first working position, the hydraulic control proportional reversing valve (7) disconnects the first control oil path from the hydraulic control proportional throttle valve (5), and the opening degree of a valve port of the hydraulic control proportional throttle valve (5) is large; when the hydraulic control proportional reversing valve (7) gradually moves to a second working position, the hydraulic control proportional reversing valve (7) communicates the first control oil path with the hydraulic control proportional throttle valve (5), and oil in the first control oil path pushes the hydraulic control proportional throttle valve (5) to reverse, so that the opening degree of a valve port of the hydraulic control proportional throttle valve (5) is changed.

2. The hydraulic system for preventing the drill rod from being stuck in the karst cave according to claim 1, wherein a hydraulic control reversing valve (9) is further connected in parallel to two ends of the throttle valve (8), the hydraulic control reversing valve (9) comprises a communicating working position and a disconnecting working position, and the hydraulic control reversing valve (9) is further connected with a second control oil path for changing the working position of the hydraulic control reversing valve.

3. A hydraulic system for preventing a cave drill rod from being stuck according to claim 2, wherein the direction changing valve (4) is communicated with an oil tank (11).

4. A solution cavity stuck borer prevention hydraulic system according to any one of claims 1 to 3, wherein the directional control valve (4) comprises an advanced position and a retracted position, and wherein when the directional control valve (4) is in the advanced position, the rodless chamber is filled with oil and the rod chamber is drained with oil, and when the directional control valve (4) is in the retracted position, the rodless chamber is drained with oil and the rod chamber is filled with oil.

5. A hydraulic system for preventing a cave-in drill rod according to claim 4, characterized in that the direction valve (4) further comprises a middle position, and when the direction valve (4) is in the middle position, the direction valve (4) cuts off the oil supply to the thrust cylinder (10).

6. The hydraulic system for preventing the drill rod from being stuck in the karst cave according to claim 4, wherein an overflow valve (3) is further connected in series between the liquid inlet (P) and the liquid return port (T) of the reversing valve (4).

7. A hydraulic system for preventing a cave from clamping a borer according to claim 5, wherein the change valve (4) is a three-position four-way valve.

8. A hydraulic system for preventing a cave from being stuck in a drill rod according to claim 6, further comprising a hydraulic pump (2) communicated with the liquid inlet (P), wherein the overflow valve (3) is positioned between the hydraulic pump (2) and the reversing valve (4).

9. The hydraulic system for preventing the drill rod from being stuck in the karst cave according to any one of claims 1 to 3, wherein a return line is communicated between the hydraulic control proportional reversing valve (7) and the hydraulic control proportional throttle valve (5), and the return line is provided with a damper (6) for controlling different input pressures of the hydraulic control proportional throttle valve (5).

10. A rock drilling rig comprising a hydraulic system for preventing a stuck drill rod in a cavern as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a hydraulic system for preventing a drill rod from being stuck in a karst cave and a drill jumbo.

Background

The rock drilling jumbo is mainly applied to tunnel construction and mine construction, and has the advantages of high drilling efficiency, high safety coefficient, less environmental pollution and the like.

The drill jumbo is often met with conditions such as karst cave, cracks, rock stratums with different hardness and the like in the operation process, and if no countermeasure is taken, the drill jamming phenomenon is very easy to occur, namely the phenomenon that the drill bit can not continuously drill or retreat in the hole and can not be drawn out from the hole is also called as the drill jamming phenomenon; therefore, after the drill rod clamping phenomenon occurs, a large amount of waste of the drill bit and the drill rod is caused in the construction process, the construction cost is increased, and the construction efficiency is reduced.

In the prior art, a drill rod jamming prevention system of a drill jumbo detects the rotating pressure of a drill rod, when the rotating pressure of the drill rod exceeds a set value, a propeller of a rock drill stops propelling or returns backwards, and when the rotating pressure of the drill rod is reduced to be below the set value, the rock drill continues to propel forwards, and the drill rod jamming prevention system only has an effect on slowly changing drill rods and cracking drill rods; when a karst cave is met, the propelling resistance of the propelling oil cylinder is suddenly reduced, so that the propelling oil cylinder can drive the drill rod to advance in an accelerating mode, when the propelling oil cylinder pushes the broken stones in the karst cave, the sudden increase of the propelling resistance and the rotary resistance makes the anti-jamming system have no time to react, the broken stones can jam the drill bit, and the anti-jamming effect of the karst cave is poor.

In summary, how to improve the effect of the karst cave blocking prevention drill rod is a technical problem that needs to be considered by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a hydraulic system for preventing a drill rod from being stuck in a karst cave and a rock drilling trolley, which can realize the control and change of the propelling speed of an oil cylinder when the karst cave is met, thereby improving the drill rod sticking prevention capability of the karst cave.

In order to achieve the purpose, the invention provides a hydraulic system for preventing a drill rod from being stuck in a karst cave, which comprises a propulsion oil cylinder, wherein a rod cavity and a rodless cavity of the propulsion oil cylinder are communicated with a reversing valve, a hydraulic control proportional throttle valve and a throttle valve are connected in series on an oil path between the rodless cavity and the reversing valve, two ends of the throttle valve are connected in parallel with a hydraulic control proportional reversing valve, the hydraulic control proportional reversing valve is also connected with the hydraulic control proportional throttle valve and a first control oil path, the hydraulic control proportional reversing valve comprises a first working position and a second working position, and the working position of the hydraulic control proportional reversing valve can be changed through the change of the pressure difference at two ends of the throttle valve so that the hydraulic control proportional reversing valve is positioned at any position among the first working position, the second working position and two stations;

when the hydraulic control proportional reversing valve is located at the first working position, the hydraulic control proportional reversing valve disconnects the first control oil path and the hydraulic control proportional throttle valve, and the opening degree of a valve port of the hydraulic control proportional throttle valve is large; when the hydraulic control proportional reversing valve gradually moves to the second working position, the hydraulic control proportional reversing valve communicates the first control oil path with the hydraulic control proportional throttle valve, so that oil in the first control oil path pushes the hydraulic control proportional throttle valve to reverse, different control pressures can be obtained by further matching with damping as the hydraulic control proportional reversing valve is located at different positions, and the opening degree of a valve port of the hydraulic control proportional throttle valve is gradually reduced.

Preferably, the two ends of the throttle valve are also connected with a hydraulic control reversing valve in parallel, the hydraulic control reversing valve comprises a communicating working position and a disconnecting working position, and the hydraulic control reversing valve is also connected with a second control oil path for changing the working position of the hydraulic control reversing valve.

Preferably, the reversing valve is communicated with the oil tank.

Preferably, the reversing valve comprises a forward position and a backward position, when the reversing valve is located in the forward position, the rodless cavity is filled with oil, and the rod cavity is filled with oil, and when the reversing valve is located in the backward position, the rodless cavity is filled with oil, and the rod cavity is filled with oil.

Preferably, the direction valve further comprises a neutral position, and when the direction valve is in the neutral position, the direction valve disconnects the supply of oil to the propulsion cylinder.

Preferably, an overflow valve is also connected in series between the liquid inlet and the liquid return port of the reversing valve.

Preferably, the reversing valve is embodied as a three-position four-way valve.

Preferably, the device further comprises a hydraulic pump communicated with the liquid inlet, and the overflow valve is positioned between the hydraulic pump and the reversing valve.

Preferably, an oil return pipeline is communicated between the hydraulic control proportional reversing valve and the hydraulic control proportional throttling valve, and the oil return pipeline is provided with damping for controlling different input pressures of the hydraulic control proportional throttling valve.

The invention also provides a rock drilling jumbo, which comprises the hydraulic system for preventing the drill rod from being stuck in the karst cave, and the hydraulic system for preventing the drill rod from being stuck in the karst cave is any one of the hydraulic systems for preventing the drill rod from being stuck in the karst cave.

Compared with the prior art, the hydraulic system for preventing the drill rod from being stuck in the karst cave comprises a propulsion oil cylinder, wherein a rod cavity and a rodless cavity of the propulsion oil cylinder are communicated with a reversing valve, a hydraulic control proportional throttle valve and a throttle valve are connected in series on an oil path between the rodless cavity and the reversing valve, the two ends of the throttle valve are connected in parallel with the hydraulic control proportional reversing valve, the hydraulic control proportional reversing valve is further connected with the hydraulic control proportional throttle valve and a first control oil path to form a complete hydraulic loop, the hydraulic control proportional reversing valve comprises a first working position and a second working position, and the working position of the hydraulic control proportional reversing valve can be changed by the change of the pressure difference at the two ends of the throttle valve.

In the invention, the hydraulic control proportional directional valve completes the switching from the first working position to the second working position according to the pressure difference at two ends of the throttle valve, thereby realizing the switching from a valve port with large opening degree to a valve port with small opening degree of the hydraulic control proportional throttle valve by communicating the first control oil path, finally reducing the oil quantity flowing through the throttle valve and slowing the propelling speed of the propulsion oil cylinder. The control process is automatically carried out according to the induction feedback of the pressure difference, so that the control device has strong flexibility, fewer valves and types, simple structure, convenience in installation and lower cost.

The invention also provides a rock drilling jumbo, which comprises the hydraulic system for preventing the drill rod from being stuck in the karst cave, and has the beneficial effects, which are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a hydraulic schematic diagram of a hydraulic system for preventing a cave from jamming a drill rod provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, fig. 1 is a hydraulic schematic diagram of a hydraulic system for preventing a cave from jamming a drill rod according to the present invention.

The hydraulic system for preventing the drill rod from being stuck in the karst cave comprises a propulsion oil cylinder 10, wherein a rod cavity B1 and a rodless cavity A1 of the propulsion oil cylinder 10 are communicated with a reversing valve 4; the working oil port A of the reversing valve 4 is connected with the rodless cavity A1 of the propulsion oil cylinder 10, and the working oil port B of the reversing valve 4 is communicated with the rod cavity B1 of the propulsion oil cylinder 10. Wherein, the reversing valve 4 can be communicated with the oil tank 11.

A hydraulic control proportional throttle valve 5 and a throttle valve 8 are connected in series on an oil path connected between the rodless cavity A1 and a working oil port A of the reversing valve 4, and the throttle valve 8 is used for generating pressure difference between the front end I and the rear end II; two ends of the throttle valve 8I and two ends of the throttle valve II are also connected with a hydraulic control proportional reversing valve 7 in parallel, and the hydraulic control proportional reversing valve 7 is connected with the hydraulic control proportional throttle valve 5 and a first control oil way; wherein the first control oil passage has a first control node PA.

The hydraulic control proportional reversing valve 7 comprises a first working position and a second working position, and the working position of the hydraulic control proportional reversing valve 7 can be changed by the change of the pressure difference at the two ends of the throttle valve 8; the pilot-operated proportional directional valve 7 is provided with a spring that keeps it in the first operating position when it is operated.

When a drill meets a karst cave, the sharp reduction of the propulsion resistance can cause the propulsion pressure of a propulsion oil cylinder 10 to suddenly reduce, so that the second end of a throttle valve 8 is quickly reduced, a large pressure difference is generated at the first end and the second end of the throttle valve 8, the sum of the spring force of the first end hydraulic control pressure of a hydraulic control proportional reversing valve 7 and the spring force of the hydraulic control proportional reversing valve 7 kept at the first working position is larger when the hydraulic control proportional reversing valve 7 works, the hydraulic control proportional reversing valve 7 is controlled to start slow change reversing, the first working position is reversed to a second working position, a first control node PA controls oil to reach the inside of the hydraulic control proportional throttle valve 5 through the hydraulic control proportional reversing valve 7, the opening of the valve port of the hydraulic control proportional reversing valve 7 is gradually increased, the valve core of the hydraulic control proportional throttle valve 5 is slowly changed in a reversing way, the opening of the valve port of the hydraulic control proportional throttle valve 5 is gradually reduced, and the flow passing through the throttle valve 8 is reduced, the propelling speed of the propelling oil cylinder 10 is gradually reduced, the pressure difference at two ends of the propelling oil cylinder is gradually reduced by reducing the flow of the throttle valve 8, and when the pressure difference at the two ends of the propelling oil cylinder makes the stress at two ends of the valve core of the hydraulic control proportional reversing valve 7 balanced, the propelling oil cylinder 10 obtains a stable low-speed propelling speed, so that a drill rod can slowly penetrate through a karst cave area, and the drill rod clamping condition is prevented.

When the drill bit passes through the karst cave area and contacts the rock stratum again, due to the increase of the propulsion resistance, the propulsion pressure of the propulsion loop propulsion oil cylinder 10 is increased, the stress of one end, provided with a spring, of the valve core of the hydraulic control proportional reversing valve 7 is larger than the stress of the other end of the valve core, the hydraulic control proportional reversing valve 7 starts to move downwards, the valve port of the hydraulic control proportional reversing valve 7 starts to be closed slowly, the control oil pressure of the hydraulic control proportional throttle valve 5 is reduced slowly, the valve core of the hydraulic control proportional throttle valve 5 moves slowly leftwards, the opening degree of the valve port of the hydraulic control proportional throttle valve 5 is gradually increased, the flow passing through the throttle valve 8 is gradually increased, the flow passing through the rodless cavity of the propulsion oil cylinder 10 is gradually increased, and the propulsion speed of the propulsion oil cylinder 10 is slowly increased until the normal rock drilling propulsion speed is recovered.

Furthermore, the two ends of the throttle valve 8 are also connected with a hydraulic control reversing valve 9 in parallel, the hydraulic control reversing valve 9 comprises a communicating working position and a disconnecting working position, the hydraulic control reversing valve 9 is provided with a spring for keeping the working position of the hydraulic control reversing valve, and the hydraulic control reversing valve 9 is located at the communicating working position under the action of the spring. When the reversing valve 4 is located at the backward position, in order to realize the rapid backward of the propulsion oil cylinder 10, the pressure oil in the rodless cavity A1 of the propulsion oil cylinder 10 returns through the hydraulic control reversing valve 9 and the working oil port A and the liquid return port T of the reversing valve 4.

The hydraulic control reversing valve 9 is further connected with a second control oil path, the second control oil path is provided with a second control node PB, and when the drill jumbo normally drills rocks and operates, the second control node PB controls oil to enable the hydraulic control reversing valve 9 to be reversed to a disconnection working position, and diversion during rock drilling operation is cut off.

The hydraulic control reversing valve 9 can be replaced by an electromagnetic reversing valve, and the same is also applicable.

Further, when no rock drilling action is carried out, when the reversing valve 4 is located in the forward position, high-pressure oil at the outlet of the hydraulic pump 2 passes through the liquid inlet P and the working oil port A of the reversing valve 4, then passes through the hydraulic control proportional throttle valve 5 and the hydraulic control reversing valve 9, and reaches the rodless cavity A1 of the propulsion oil cylinder 10, so that the propulsion oil cylinder 10 moves forward, the rock drilling machine is rapidly propelled, and pressure oil in the rod cavity B1 of the propulsion oil cylinder 10 returns to the oil tank 11 through the working oil port B and the liquid return port T of the reversing valve 4.

When the reversing valve 4 is located at the backward position, high-pressure oil at the outlet of the hydraulic pump 2 enters the rod cavity B1 of the oil cylinder 10 through the liquid inlet P and the working oil port B of the reversing valve 4 at the moment, so that the propulsion oil cylinder 10 can rapidly retreat, and pressure oil in the rodless cavity A1 of the propulsion oil cylinder 10 is connected with the working oil port A and the liquid return port T of the reversing valve 4 through the hydraulic control reversing valve 9 and the hydraulic control proportional throttle valve 5 and returns to the oil tank 11.

In addition, when only the propulsion oil cylinder 10 works and no rock drilling action is performed, the first control node PA and the second control node PB have no pressure control oil, the hydraulic control proportional throttle valve 5 and the hydraulic control reversing valve 9 are both provided with springs for keeping the working positions of the hydraulic control proportional throttle valve 5 and the hydraulic control reversing valve 9, and the hydraulic control proportional throttle valve 5 and the hydraulic control reversing valve 9 are both located at normal positions under the action of the springs; the movement process aiming at the rapid propulsion and rapid retreat is both rock drilling-free action, and only the independent action working condition of the propulsion oil cylinder is carried out.

Further, the reversing valve 4 also comprises a middle position, and when the reversing valve 4 is positioned at the middle position, the reversing valve 4 cuts off the oil supply to the propulsion oil cylinder 10 and is used when the oil cylinder stops operating.

Further, still include, still establish ties between the inlet P of switching-over valve 4 and the liquid mouth T and have had overflow valve 3, played the effect of protection system safety in this embodiment.

Furthermore, the reversing valve 4 is specifically a three-position four-way valve, two working positions are arranged on two sides and respectively matched with the forward state and the backward state of the hydraulic system to work, one middle position is used when the hydraulic system is stopped, and the three-position four-way valve is standard and uniform as common equipment, simple in structure and easy to replace. Of course, the reversing valve 4 may also be embodied as an electromagnetic reversing valve, etc., and is also applicable and will not be expanded herein.

Further, a liquid inlet P of the reversing valve 4 is also communicated with a hydraulic pump 2, and the hydraulic pump 2 is provided with a motor 1 for supplying power to the hydraulic pump; the relief valve 3 is located between the hydraulic pump 2 and the directional valve 4.

Furthermore, an oil return pipeline is communicated between the hydraulic control proportional reversing valve 7 and the hydraulic control proportional throttle valve 5, the damping 6 arranged on the oil return pipeline is matched with different openings of a valve core of the hydraulic control proportional reversing valve 7, different pressure differences can be generated to help the hydraulic control proportional throttle valve 5 to complete slow change reversing, and when the valve core of the hydraulic control proportional reversing valve 7 is closed, the control oil of the hydraulic control proportional throttle valve 5 can be smoothly unloaded.

The invention provides a drill jumbo with a hydraulic system for preventing a karst cave drill rod from being blocked, which comprises the hydraulic system for preventing the karst cave drill rod from being blocked, which is described in the specific embodiment; other parts of the drill jumbo may be referred to in the art and are not expanded herein.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The hydraulic system for preventing the drill rod from being stuck in the karst cave and the rock drilling jumbo provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.