CN217151840U - Rock drilling device suitable for coal mining - Google Patents

Abstract

The embodiment of the utility model provides a rock drilling device suitable for coal mining, including pneumatic rock breaking assembly, high-pressure water jet assembly and drill bit that includes the water course; the pneumatic rock breaking assembly comprises a shell, a hydraulic accelerating assembly and an airflow switching-on assembly, wherein the hydraulic accelerating assembly and the airflow switching-on assembly are arranged in the shell; the high-pressure water jet assembly comprises a water source and a stamping assembly; the punching assembly is arranged in the shell and is positioned at the downstream of the hydraulic accelerating assembly; the hydraulic accelerating assembly is used for flushing a water source into the stamping assembly, and the stamping assembly is used for collecting the water source; the drill bit is connected with the punching assembly, and water sources are collected by the punching assembly and impact the rock through a water channel of the drill bit to drive the drill bit to break the rock mechanically. The utility model provides a water jet that exists among the prior art unstable, it is difficult to the effectual supplementary drill bit atress condition that reduces, can't effectively promote the technical problem of the broken rock efficiency of drilling.

Description

Rock drilling device suitable for coal mining

Technical Field

The utility model relates to a coal exploitation technical field especially relates to a rock drilling device suitable for coal exploitation.

Background

The exploration of mineral resources in the deep part of the earth is trending, wherein the coal mining depth is increased at the average speed of nearly 20m per year, the shallow part of the coal resources are increasingly exhausted, and the deep part of the coal mining becomes the normal state of the coal resource development. The pneumatic anchor rod drilling machine and the high-pressure water jet rock breaking device are commonly used as rock drilling equipment in the mining and rock drilling process, but the hardness, the elastic modulus and the breaking strength of deep stratum rocks are continuously increased along with the increase of the mining depth, the compressive strength of the rocks can reach more than 100MPa, so that the impact and the abrasion on a drill rod and a cutter in the drilling process of the pneumatic anchor rod drilling machine are rapidly increased, the fracture of the drill rod and the damage of a drill bit are easily caused, and the rock breaking capacity and the rock breaking efficiency are greatly reduced. Meanwhile, the associated dust in the rock breaking process deteriorates the underground ecological environment, and because the underground space is limited, the polluted air is difficult to be quickly purified to the standard of clean air only by manual ventilation, so that the health of constructors is damaged to different degrees. The field practice shows that the drilling efficiency can not be increased and the drill bit abrasion can be aggravated only by increasing the power of the drilling machine, so that the rock breaking efficiency of the drilling can not be effectively improved only by increasing the power of the drilling machine.

The high-pressure water jet rock breaking is realized by impacting broken rocks with high-speed water flow, so that the stress of the drill bit can be reduced in an auxiliary manner, the rock breaking capacity is improved to a certain extent, and the service life of the drill bit is prolonged. However, conventional high-pressure water jet assist equipment tends to have the following problems: the continuous high-pressure water jet only generates single water hammer pressure, and subsequent stagnation pressure is difficult to aggravate internal fracture of rocks, so that the rock breaking efficiency is poor; the high-pressure water jet auxiliary equipment usually utilizes components such as a high-pressure water pump, a supercharger and the like to generate high-pressure water flow, and the generated water jet is unstable and difficult to effectively assist in reducing the stress condition of a drill bit.

SUMMERY OF THE UTILITY MODEL

The water jet that produces is equipped to the high-pressure water jet assistance that exists among the above-mentioned prior art unstablely, is difficult to the effectual supplementary technical problem that reduces the drill bit atress condition, can't effectively promote the broken rock efficiency of drilling, the utility model provides a rock drilling device who is applicable to coal exploitation that the subassembly is penetrated to the high-pressure water and is fused into the pneumatic broken rock subassembly and make up into can effectively promote the water jet stability that the subassembly produced, and the effective supplementary pneumatic broken rock subassembly can effectively promote rock drilling efficiency.

An embodiment of the utility model provides a rock drilling device suitable for coal mining, include:

the pneumatic rock breaking assembly comprises a shell, a hydraulic accelerating assembly and an airflow switching-on assembly, wherein the hydraulic accelerating assembly and the airflow switching-on assembly are arranged in the shell; wherein the airflow communication assembly is connected with the housing;

the high-pressure water jet assembly comprises a water source and a punching assembly; the ram assembly is disposed inside the housing and downstream of the hydraulic acceleration assembly; the hydraulic accelerating assembly flushes the water source into the punching assembly, and the punching assembly collects the water source; and

a drill bit including a waterway; the drill bit with the punching assembly is connected, the water source process punching assembly collects the back and passes through the water course of drill bit strikes and drives the broken rock of drill bit machinery.

In some embodiments, the ram assembly comprises a ram and a water collector, an elastic water reservoir and a water collecting impactor connected end to end in sequence; the inlet of the water source is arranged on the shell and positioned at one side of the hydraulic accelerating assembly in the length direction of the shell; the input end of the water collector is positioned at one side of the inlet of the water source, which is far away from the hydraulic accelerating component, and the output end of the water collector is connected with the elastic water reservoir; the output end of the water-collecting impactor is connected with the drill bit; one end of the punch is arranged in the shell, and the other end of the punch intermittently presses and contacts the elastic water storage device.

In some embodiments, in the length direction of the shell, a first limit plate and a second limit plate are arranged inside the shell to divide the shell into a first chamber, a second chamber and a third chamber; wherein the punch assembly is disposed within the third chamber; the inlet of the water source is disposed on a side wall of the third chamber.

In some embodiments, the hydraulic acceleration assembly comprises a first acceleration assembly and a second acceleration assembly; wherein the first acceleration assembly is located within the first chamber and includes a first piston and a drill rod located to one side of the first piston; the first piston reciprocates within the first chamber; one end of the drill rod close to the first piston reciprocates in the first chamber; the other end of the first piston, which is far away from the first piston, can pass through the second limiting plate to reciprocate in the first chamber and the second chamber; the second acceleration assembly is located within the second chamber and includes a second piston; the second piston is connected to the drill rod and reciprocates within the second chamber.

In some embodiments, the first acceleration assembly comprises a first resilient element connected to one end of the drill rod and located between the drill rod and the first piston; the second acceleration assembly comprises a second elastic element, and the second piston is connected with the drill rod through the second elastic element.

In some embodiments, the air flow diversion assembly comprises an air source, an air path conversion piece, a first air inlet pipe, a second air inlet pipe and an air outlet pipe; the gas source is introduced into the gas path conversion piece; the output end of the gas path conversion piece is respectively connected with the first gas inlet pipe and the second gas inlet pipe; the first air inlet pipe leads gas to one side in the first cavity; the other end of the second air inlet pipe is communicated with the first chamber and is positioned between the limit positions of the drill rod and the first piston which move to the other side of the first chamber; one end of the exhaust pipe is communicated with the middle part of the first cavity and is positioned on one side, away from the first air inlet pipe, of the first piston, and the other end of the exhaust pipe is communicated with outside air.

In some embodiments, the air path conversion member includes an air inlet end, a first output end, a second output end, and a valve spool; the air inlet end is connected with the air source; the first output end is connected with the first air inlet pipe; the second output end is connected with the second air inlet pipe; the valve core rotates through the gas input by the gas inlet end or the second output end, and changes the passage of the gas source.

In some embodiments, an input end area of the sump is larger than an input end area, and an output end of the sump is provided with a backflow prevention valve.

In some embodiments, the punch comprises an electronic telescopic rod and a buffer head which are oppositely arranged in the height direction of the shell; one end of the electronic telescopic rod is arranged on the inner wall of the shell, and the other end of the electronic telescopic rod is provided with the buffering package head; the buffering packet head intermittently extrudes and contacts the elastic water accumulator according to the telescopic movement of the electronic telescopic rod.

In some embodiments, the elastic water reservoir has an input end area larger than an output end area and has an elastic structure with a certain accommodating space.

Compared with the prior art, the beneficial effects of the utility model are that:

the embodiment of the utility model provides an air supply pneumatic energy of rock drilling device suitable for coal mining converts into water conservancy pulse energy and impact mechanical energy, has improved the drilling rate of hard rock; the high-pressure water jet auxiliary equipment can generate stable water jets with the same jet quantity, so that the stress condition of the drill bit is effectively reduced in an auxiliary mode, the rock breaking capacity of the drill bit is improved, and the service life of the drill bit is prolonged; meanwhile, the water jet in the rock drilling device can reduce the dust concentration in the drilling process, and the aim of purifying the air in the underground coal mine is fulfilled.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a rock drilling apparatus according to an embodiment of the invention;

figure 2 is a schematic view of a rock drilling device according to an embodiment of the invention

Fig. 3 is a schematic structural view of a stamping assembly according to an embodiment of the present invention;

fig. 4 is a schematic view illustrating an operation principle of the air path switching element according to an embodiment of the present invention;

fig. 5 is a schematic view of another operation principle of the air path conversion member according to an embodiment of the present invention.

Description of reference numerals:

a rock drilling apparatus 100;

a pneumatic rock breaking assembly 1;

a housing 10; a first limit plate 101; a second limiting plate 102; a first chamber 103; a second chamber 104; a third chamber 105;

a hydraulic accelerating assembly 11; a first acceleration component 111; a first piston 1111; a shank 1112; a first elastic member 1113; a second acceleration component 112; a second piston 1121; the second elastic element 1122;

an air flow pass-through assembly 12; a gas source 121; an air path switching piece 122; an air inlet end 1221; a first output 1222; a second output 1223; a spool 1224; a first intake pipe 123; a second intake pipe 124; an exhaust pipe 125;

a high-pressure water jet assembly 2;

a punch assembly 20; a punch 201; the electronic telescopic bar 2011; a buffer packet head 2012; a water collector 202, an elastic water storage device 203 and a water collecting impactor 204;

a water source 21;

a drill bit 30.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

A rock drilling apparatus 100 suitable for coal mining according to an embodiment of the present invention is described below with reference to the accompanying drawings shown in fig. 1-5.

As shown in fig. 1 in particular, embodiments of the present invention provide a rock drilling apparatus 100 suitable for coal mining, comprising a pneumatic rock breaking assembly 1, a high pressure water jet assembly 2, and a drill bit 30 including a water channel; the pneumatic rock breaking assembly 1 comprises a shell 10, a hydraulic accelerating assembly 11 and a gas flow circulating assembly 12, wherein the hydraulic accelerating assembly 11 and the gas flow circulating assembly 12 are arranged in the shell 10; wherein the air flow circulating assembly 12 is connected with the shell 10; the high-pressure water jet assembly 2 comprises a water source 21 and a punching assembly 20; the punching assembly 20 is arranged inside the shell 10 and is positioned at the downstream of the hydraulic accelerating assembly 11, wherein the hydraulic accelerating assembly 11 is used for punching a water source 21 into the punching assembly 20, and the punching assembly 20 is used for collecting the water source 21; the drill bit 30 is connected with the punching assembly 20, and the water source 21 is collected by the punching assembly 20 and then impacts the rock through a water channel of the drill bit 30 and drives the drill bit 30 to mechanically break the rock. In the embodiment, the air source pneumatic energy is converted into hydraulic pulse energy and impact mechanical energy, and high-pressure water jet auxiliary equipment is used for generating stable water jets with the same jet quantity, so that the stress condition of the drill bit 30 is effectively reduced in an auxiliary manner, and the rock breaking capacity of the drill bit 30 is improved; in addition, the dust concentration in the drilling process can be reduced, and the aim of purifying the air in the underground coal mine is fulfilled.

It is convenient for those skilled in the art to understand that the following description will be made by taking the case where the longitudinal direction of the housing 10 coincides with the left-right direction and the height direction coincides with the up-down direction, and the left-right direction and the up-down direction are the directions indicated in fig. 2.

As shown in fig. 2, a first limiting plate 101 and a second limiting plate 102 are sequentially disposed from left to right inside the housing 10, and the housing 10 is sequentially divided into a first chamber 103, a second chamber 104, and a third chamber 105 from left to right. The upper end and the lower end of the first limiting plate 101 and the upper end and the lower end of the second limiting plate 102 are both fixedly connected with the inner wall of the shell 10; and the first limiting plate 101 and the second limiting plate 102 are both provided with through holes.

The hydraulic accelerating assembly 11 comprises a first accelerating assembly 111 and a second accelerating assembly 112; disposed within the first chamber 103 is a first acceleration assembly 111 comprising a first piston 1111 and a drill rod 1112 located to the right of the first piston 1111. Specifically, the drill rod 1112 includes a vertical end and a lateral end, and is disposed inside the first chamber 103 in a "T" shape, i.e., the vertical end of the drill rod 1112 is perpendicular to the length direction of the housing 10 and is adjacent to the first piston 1111, i.e., the lateral end of the drill rod 1112 is parallel to the length direction of the housing 10 and is adjacent to the second acceleration assembly 112.

As understood by those skilled in the art, the first piston 1111 and the drill rod 1112 can slide left and right in the first chamber 103, when the drill rod 1112 moves to the right, the transverse end of the drill rod 1112 can pass through the through hole of the first limit plate 101 to enter the second chamber 104 from the first chamber 103, and the second piston 1121 is pushed to move right in the second chamber 104 until the vertical end of the drill rod 1112 contacts the first limit plate 101, and the vertical end of the drill rod 1112 is limited by the first limit plate 101 so as not to pass through the first chamber 103, at this time, the drill rod 1112 moves to the right to the limit.

A second piston 1121 is arranged in the second chamber 104, one end of the second piston 1121 is connected with the drill rod 1112, the second piston 1121 can reciprocate left and right in the second chamber 104 according to the movement of the drill rod 1112, the second piston 1121 moves towards the left side until the second piston 1121 is contacted with the right side of the first limiting plate 101, at the moment, the second piston 1121 moves towards the left side to the limit, and the first limiting plate 101 limits the second piston 1121 from entering the first chamber 103; when the second piston 1121 moves to the right side until contacting with the left side of the second limiting plate 102, at this time, the second piston 1121 moves to the limit to the right side, and the second limiting plate 102 limits the second piston 1121, so as to prevent the second piston 1121 from entering the water inlet of the water source 21 in the third chamber 105, and thus the water is prevented from flowing into the second chamber 104.

In some embodiments, the first acceleration assembly 111 includes a first resilient element 1113, the first resilient element 1113 coupled to an end of the shank 1112 and positioned between the shank 1112 and the first piston 1111.

It is understood that the first elastic element 1113 can be a spring or other suitable elastic material, and the first elastic element 1113 is connected to the left end of the drill rod 1112 to buffer the impact force of the first piston 1111, so as to prevent the first piston 1111 from directly impacting the drill rod 1112 and causing damage to the first piston 1111.

In some embodiments, a second elastic element 1122 is disposed between the left end of the second piston 1121 and the right end of the drill rod 1112, and one end of the second piston 1121 is connected to the drill rod 1112 through the second elastic element 1122, that is, two ends of the second elastic element 1122 are connected to the drill rod 1112 and the second piston 1121, respectively.

It will be appreciated that the second elastic element 1122 may be a spring or other suitable elastic material, and the second elastic element 1122 is used for receiving the power of the drill rod 1112 and converting it into elastic potential energy.

In some embodiments, second piston 1121 is fitted with a seal groove. It is understood that the second piston 1121 is used for pressing water, and the sealing groove is provided to prevent water from flowing to the left side of the second piston 1121.

In some embodiments, the airflow diverting assembly 12 includes an air supply 121, an air path switching piece 122, a first air inlet pipe 123, a second air inlet pipe 124, and an air outlet pipe 125; the air source 121 is introduced into the air path conversion piece 122; the output end of the air path conversion piece 122 is respectively connected with a first air inlet pipe 123 and a second air inlet pipe 124; the first gas inlet pipe 123 introduces gas into one side of the first chamber 103; the other end of the second air inlet pipe 124 is communicated with the first chamber 103 and is positioned between the drill rod 1112 and the limit position of the other side of the first chamber 103 where the first piston 1111 moves; one end of the exhaust pipe 125 communicates with the middle of the first chamber 103 and is located on the side of the first piston 1111 away from the first intake pipe 123, and the other end communicates with the outside air.

As shown in fig. 1 and 2, the air path converter 122 includes an air inlet 1221, a first output 1222, a second output 1223, and a valve spool 1224, and the air source 121 provides power to the first piston 1111 through the air path converter 122, that is: the air source 121 (shown by a downward arrow) can enter the air inlet 1221 of the air path switching element 122 through the valve-operated air hole connection air inlet pipe, and then the entering air source 121 can be led into the first air inlet pipe 123 connected to the first output end 1222 or the second air inlet pipe 124 connected to the second output end 1223 according to the state of the valve core 1224.

It will be appreciated that the spool 1224 rotates via gas input from the inlet end 1221 or the second output end 1223, and the description of the valve spool is omitted here for the conventional arrangement in the art. It should be noted that the air path switching element 122 is schematically illustrated in fig. 4, and air flows out from the first output end 1222 (the air flow is indicated by arrows); for example, as shown in fig. 5, gas flows out of the second output 1223) (gas flow is shown by arrows). As shown in fig. 2, the first output end 1222 of the air path switching piece 122 is connected to the first air inlet pipe 123, and the other end of the first air inlet pipe 123 penetrates through the housing 10 and is disposed at the left side of the first piston 1111; the second output end 1223 of the air path switching piece 122 is connected to the second air inlet pipe 124, and when the air source 121 pushes both the first piston 1111 and the drill rod 1112 to move to the right limit position of the first chamber 103, the end of the air outlet pipe 125 and the end of the second air inlet pipe 124 communicating with the first chamber 103 are respectively located on the left side of the first piston 1111 and between the first piston 1111 and the drill rod 1112.

In some embodiments, the ram assembly 20 comprises a ram 201 and a water collector 202, an elastic water reservoir 203 and a water collecting impactor 204 connected end to end in sequence; in the length direction of the shell 10, the inlet of the water source 21 is arranged on the shell 10 and is positioned at one side of the hydraulic accelerating assembly 11; the input end of the water collector 202 is positioned at the side of the inlet of the water source 21 far away from the hydraulic accelerating component 11, and the output end of the water collector 202 is connected with the elastic water reservoir 203; the output end of the water hammer 204 is connected with the drill bit 30; one end of the punch 201 is disposed in the housing 10 and the other end is intermittently press-contacted to the elastic water reservoir 203.

Specifically, as shown in fig. 2 and 3, the punching assembly 20 is disposed in the third chamber 105, a water collector 202, an elastic water reservoir 203 and a water collecting impactor 204 are sequentially disposed in the third chamber 105 from left to right, and an output end of the water collector 202 is connected to an input end of the elastic water reservoir 203; the output end of the elastic water reservoir 203 is connected with the input end of the water receiving impactor 204, and the output end of the water receiving impactor 204 is connected with the water channel of the drill bit 30. The punch 201 includes an electronic telescopic rod 2011 and a buffer ferrule 2012 which are oppositely arranged in the height direction of the shell 10; one end of the electronic telescopic rod 2011 is arranged on the inner wall of the shell 10, and the other end of the electronic telescopic rod 2011 is provided with a buffering ferrule 2012; the buffer ferrule 2012 intermittently presses the elastic water reservoir 203 according to the expansion and contraction of the electronic expansion rod 2011.

Specifically, the input end of the water collector 202 is located on the right side of the water source 21 inlet, wherein the water source 21 inlet is located on the right side of the second limiting plate 102, specifically, the inlet of the water source 21 is arranged between the second limiting plate 102 and the water collector 202. Various methods and devices for connecting the water source 21 to the third chamber 105 are available, for example, a water inlet pipe is connected to the connection port of the water source 21, a water pump is connected to the other end of the water inlet pipe, and a water valve is arranged between the water pump and the water inlet pipe. The water pump 31 is used to pump water, a low pressure water pump may be used, and the water valve 32 is used to control the flow rate of the water in the water inlet pipe 33.

It should be noted that the buffering ferrule 2012 can intermittently press and contact the elastic water reservoir 203, wherein the electronic telescopic rods 2011 oppositely arranged in the height direction of the shell 10 synchronously move, i.e. extend or contract together, so as to press the buffering ferrule 2012 against the elastic water reservoir 203 at the same time, and the buffering ferrule 2012 is made of a soft material which is not easily deformed, so that the elastic water reservoir 203 is not mechanically scratched when contacting the buffering ferrule 2012. In addition, the stretching out of the electronic telescopic rod 2011 utilizes the buffer toe cap 2012 to press and contact the elastic water reservoir 203 synchronously with the action that the second piston 1121 presses water to the right, namely, after the two pistons 1121 move to the right to press the water into the water collector 202 and enter the elastic water reservoir 203, the buffer toe cap 2012 contacts and presses the elastic water reservoir 203.

In this embodiment, the second piston 1121 of the hydraulic accelerating assembly 11 can reciprocate in the second chamber 104, so that the water entering the third chamber 105 enters the water collector 202 under the impact of the second piston 1121, preferably, the cross-sectional area of the input end of the water collector 202 is larger than that of the input end, and the cross-sectional area of the water collector 202 gradually decreases from left to right, thereby realizing water convergence. And in some embodiments, the output end of the water collector 202 is provided with a reverse flow prevention valve to prevent the reverse flow of water.

In some embodiments, the elastic reservoir 203 has an input end area larger than an output end area and has an elastic structure with a certain accommodation space. That is, in the working process, water flows from the left end of the elastic water reservoir 203 to the right end of the elastic water reservoir 203, and the area of the input end of the elastic water reservoir 203 is larger than that of the output end, so that the second convergence of water power and water quantity is realized. And the water in the elastic water reservoir 203 is intermittently extruded through the buffering ferrule 2012, and the water at the output end of the elastic water reservoir 203 is subjected to continuous pressure holding-releasing-pressure holding-releasing to form hydraulic pulse with stable water power and water quantity, so that the third convergence of hydraulic energy is realized.

It should be noted here that since the output end of the water collector 202 is provided with the valve for preventing reverse flow, the water in the elastic water reservoir 203 can only flow out through the output end.

In some embodiments, the water hammer 204 is connected to the output end of the elastic water reservoir 203 at one end and is fixedly connected to the drill bit 30 at the other end by a thread provided on the outside of the water hammer.

As will be appreciated by those skilled in the art, a drill bit 30 is provided at the forwardmost end of the housing 10 for mechanically drilling rock. Preferably, a spring is arranged at the front end inside the second shrinkage pipe 22, and under the pushing action of the spring, the feed amount can be controlled, so that the feed is relatively gentle and stable, and the drill 30 is prevented from being damaged. In this embodiment, the gas source such as high-pressure gas generates a periodic compression effect on water, the water passes through the hydraulic accelerating assembly 11 to form a periodic hydraulic pulse, the hydraulic pulse acts on the drill bit 30 to apply a periodic impact force to the drill bit 30, so that the stress state of the drill bit 30 and the rock is improved, and the drill bit 30 also has a vibration impact effect while rotating. When the drilling machine drills in a rotary impact mode, uncrushed rocks are in a tension pressure stress state, and the rocks are broken more easily after being subjected to periodic impact, so that the rock breaking efficiency of the pneumatic machine is improved. In addition, the hydraulic pulse can also be converted into hydraulic jet to act on the rock, so that a certain softening effect is realized on the rock, the breaking strength of the rock is reduced to a certain degree, meanwhile, the hydraulic jet plays a certain role in cutting the rock, the rock is resistant to compression and tensile, and the mechanical rock breaking effect of the pneumatic drilling machine is facilitated.

The operation principle of the embodiment of the present invention will be explained as follows:

the water pump is started to open the water valve, water enters the second chamber 104 through the water inlet, then the operating valve of the air source 121 is opened, the air source 121 such as high-pressure air flows out of the air hole of the operating valve, and the flowing air can be adjusted through adjusting the air hole of the operating valve so as to adjust the size and the frequency of the hydraulic pulse. High-pressure gas flows in from the gas inlet end 1221 of the gas path switching member 122 through the gas inlet pipe, and at the same time, the valve core 1224 blocks the second gas outlet end 1223 of the gas path switching member 122, the high-pressure gas enters the space on the left side of the first piston 1111 and pushes the first piston 1111 to move to the right side, when the first piston 1111 moves rightward to the right side of the exhaust pipe 125, high-pressure gas escapes from the exhaust pipe 125, meanwhile, the first piston 1111 continues to move to the right, and as the first piston 1111 presses the air in the first chamber 103, a portion of the air flows from the second air inlet pipe 124 to the air path switching member 122, and acts on the air path switching member 122, at this time, the spool 1224 seals the first output port 1222, and high pressure gas enters the first chamber 103 from the second output end 1223 through the second inlet pipe 124, at which time, the first piston 1111 moves to the right to the limit and contacts the drill rod 1112, pushing the drill rod 1112 to move to the right.

High-pressure gas enters the first chamber 103 from the second gas inlet pipe 124 to push the first piston 1111 to move to the left, when the first piston 1111 moves to the left of the gas outlet pipe 125, the high-pressure gas escapes from the gas outlet pipe 125, at this time, the first piston 1111 continues to move to the left, and during the movement of the first piston 1111 to the left, the air in the first chamber 103 is pressed, so that part of the air flows from the first gas inlet pipe 123 to the gas path switching piece 122 and acts on the gas path switching piece 122, so that the valve core 1224 seals the second output end 1223, at this time, the first piston 1111 moves to the left to the limit position, the high-pressure gas enters the space on the left side of the first piston 1111 from the first output end 1222 of the gas path switching piece 122 to push the first piston 1111 to move to the right, and impact the drill rod 1112 again. Repeating the above process causes the first piston 1111 to reciprocate within the first chamber 103.

The rod 1112 moving to the right contacts the second piston 1121, the second piston 1121 carrying high impact energy moves to the right to press the water in the second chamber 104, and when the second piston 1121 stops moving in the second chamber 104, the second elastic element 1122 is compressed to the shortest, at which time the stored elastic potential energy is the largest. Subsequently, the second elastic element 1122 releases the elastic potential energy, pushing the drill rod 1112 to move to the left and stop at the left side of the first chamber 103, at which point the drill rod 1112 returns to complete the sequential reciprocating movement until the next impact of the first piston 1111.

The second piston 1121 moves towards the right side to extrude water in the second chamber 104 to flow through the water collector 202 to achieve primary gathering of the water flow and energy gathering, then the water flows through the elastic water storage device 203 to achieve hydraulic energy gathering for the second time, the water in the elastic water storage device 203 is intermittently extruded through the buffering pipe head 2012 under the action of the electronic telescopic rod 2011, and the water at the output end of the elastic water storage device 203 is subjected to continuous pressure holding-releasing-pressure holding-releasing to form hydraulic pulses with stable hydraulic power and water quantity, so that hydraulic energy is gathered for the third time.

Then, the water passes through the water receiving impactor 204, so that the hydraulic energy is gathered for the fourth time and passes through the water channel of the drill bit 30 to form hydraulic jet flow to impact the rock. The hydraulic pulse acts on the front end water-receiving impactor 204 of the water-receiving impactor 204 to drive the drill bit 30 to generate vibration impact force and act on the rock, so that the mechanical rock breaking effect is generated. This impact process achieves the conversion of pneumatic energy to hydraulic pulses and mechanical impact energy. The hydraulic pulse generated in the process acts on the rock to generate periodic 'water hammer pressure', the rock is impacted to generate stress waves, and the stress waves generate interference in the rock to aggravate the damage degree of the rock; meanwhile, the hydraulic pulse drives the drill bit 30 to generate mechanical vibration impact, and finally the effect of improving the rock drilling efficiency is achieved.

The device directly acts on the drill bit 30 through hydraulic pulse, so that appliances such as easily-damaged impact hammers and the like commonly adopted in the conventional rotary impactor are reduced, and the safety and reliability of the system are improved. Meanwhile, a hydraulic accelerating device is introduced, so that a heavy high-pressure water pump or a pressurizing device is avoided, the equipment is light and convenient to assemble, the rock breaking speed of hard rock is effectively improved, and pneumatic energy is converted into hydraulic pulse energy and mechanical energy, so that the hard rock can be broken in a coal mine site more conveniently.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A rock drilling apparatus suitable for coal mining, comprising:

the pneumatic rock breaking assembly comprises a shell, a hydraulic accelerating assembly and an airflow switching-on assembly, wherein the hydraulic accelerating assembly and the airflow switching-on assembly are arranged in the shell; wherein the airflow communication assembly is connected with the housing;

the high-pressure water jet assembly comprises a water source and a punching assembly; the ram assembly is disposed inside the housing and downstream of the hydraulic acceleration assembly; the hydraulic accelerating assembly flushes the water source into the punching assembly, and the punching assembly collects the water source; and

a drill bit including a waterway; the drill bit with the punching assembly is connected, the water source process punching assembly collects the back and passes through the water course of drill bit strikes and drives the broken rock of drill bit machinery.

2. A rock drilling apparatus as claimed in claim 1, wherein the punch assembly comprises a punch and a water collector, a resilient water reservoir and a water hammer connected end to end in sequence; the inlet of the water source is arranged on the shell and positioned on one side of the hydraulic accelerating assembly in the length direction of the shell; the input end of the water collector is positioned at one side of the inlet of the water source, which is far away from the hydraulic accelerating assembly; the output end of the water collector is connected with the elastic water storage device; the output end of the water-collecting impactor is connected with the drill bit; one end of the punch is arranged in the shell, and the other end of the punch is intermittently in extrusion contact with the elastic water reservoir.

3. A rock drilling apparatus as claimed in claim 2, wherein a first and second limit plate are provided inside the housing in the length direction of the housing to divide the housing into a first, second and third chamber; wherein the punch assembly is disposed within the third chamber; the inlet of the water source is disposed on a side wall of the third chamber.

4. A rock drilling apparatus as claimed in claim 3, wherein the hydraulic acceleration assembly comprises a first acceleration assembly and a second acceleration assembly; wherein the first acceleration assembly is located within the first chamber and includes a first piston and a drill rod located to one side of the first piston; the first piston reciprocates within the first chamber; the drill rod is close to one end of the first piston and reciprocates in the first chamber; the other end of the drill rod, which is far away from the first piston, can pass through the second limiting plate to reciprocate in the first cavity and the second cavity; the second acceleration assembly is located within the second chamber and includes a second piston; the second piston is connected to the drill rod and reciprocates within the second chamber.

5. A rock drilling apparatus as claimed in claim 4, wherein the first acceleration assembly comprises a first resilient element connected to one end of the drill rod and located between the drill rod and the first piston; the second acceleration assembly comprises a second elastic element, and the second piston is connected with the drill rod through the second elastic element.

6. A rock drilling apparatus as claimed in claim 4, wherein the air flow diversion assembly comprises an air supply, an air path transition piece, a first air inlet tube, a second air inlet tube and an air outlet tube; the gas source is introduced into the gas path conversion piece; the output end of the gas path conversion piece is respectively connected with the first gas inlet pipe and the second gas inlet pipe; the first air inlet pipe leads gas to one side in the first cavity; the other end of the second air inlet pipe is communicated with the first chamber and is positioned between the limit positions of the drill rod and the first piston which move to the other side of the first chamber; one end of the exhaust pipe is communicated with the middle part of the first cavity and is positioned on one side, away from the first air inlet pipe, of the first piston, and the other end of the exhaust pipe is communicated with outside air.

7. A rock drilling apparatus as claimed in claim 6, wherein the gas path transition piece comprises an inlet end, a first outlet end, a second outlet end and a spool; the air inlet end is connected with the air source; the first output end is connected with the first air inlet pipe; the second output end is connected with the second air inlet pipe; the valve core rotates through the gas input by the gas inlet end or the second output end, and changes the passage of the gas source.

8. A rock drilling apparatus as claimed in claim 3, characterised in that the input end area of the water trap is larger than the input end area and the output end of the water trap is provided with a valve for preventing back flow.

9. A rock drilling apparatus as claimed in claim 3, wherein the punch comprises an electric telescopic rod and a buffer head oppositely arranged in the height direction of the housing; one end of the electronic telescopic rod is arranged on the inner wall of the shell, and the other end of the electronic telescopic rod is provided with the buffering package head; the buffering packet head intermittently extrudes and contacts the elastic water accumulator according to the telescopic movement of the electronic telescopic rod.

10. A rock drilling apparatus as claimed in claim 3, wherein the elastic accumulator has an input end area greater than an output end area and is of an elastic construction with a receiving space.

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