CN114033412B - High-pressure water jet mixed abrasive injection device - Google Patents
High-pressure water jet mixed abrasive injection device Download PDFInfo
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- CN114033412B CN114033412B CN202111318218.8A CN202111318218A CN114033412B CN 114033412 B CN114033412 B CN 114033412B CN 202111318218 A CN202111318218 A CN 202111318218A CN 114033412 B CN114033412 B CN 114033412B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
- E21D9/1066—Making by using boring or cutting machines with fluid jets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
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Abstract
The invention provides a high-pressure water jet mixed abrasive injection device, which relates to the technical field of high-pressure water agent abrasive mixed injection rock breaking, and comprises a nozzle body, wherein the nozzle body is provided with a jet channel which is communicated with the nozzle body along the axial direction, the jet channel comprises an inlet section, a contraction section and a diffusion section which are sequentially arranged, the inner diameter of the contraction section is respectively smaller than that of the inlet section and that of the diffusion section, an abrasive input channel and a debris suction channel are respectively arranged in the nozzle body, one end of the abrasive input channel is opened on the side wall of the nozzle body, the other end of the abrasive input channel is communicated with the contraction section, one end of the debris suction channel is opened on the side wall of the nozzle body, and the other end of the debris suction channel is communicated with the contraction section. The high-pressure water jet mixed abrasive jetting device provided by the invention can carry out secondary utilization or cyclic utilization on the chip particles, the old abrasive and the like, and resources are saved.
Description
Technical Field
The invention relates to the technical field of rock breaking by high-pressure water agent abrasive mixed injection, in particular to a high-pressure water jet mixed abrasive injection device.
Background
The Tunnel Boring Machine (TBM) is used for carrying out parallel continuous operation on construction procedures such as tunneling, supporting, deslagging and the like, is industrial assembly line tunnel construction equipment integrating mechanical, electric, liquid, optical, gas and the like, and has the advantages of high tunneling speed, environment friendliness, high comprehensive benefit and the like. The existing tunnel boring machine generally adopts a technical scheme of crushing rock by combining high-pressure water jet and mechanical force.
The high-pressure water jet is a high-speed water stream with concentrated energy sprayed out by a nozzle with a certain shape, which takes water as a medium and obtains huge energy through the increase of high-pressure generating equipment. In order to increase the rock breaking capacity of the high-pressure water jet, abrasive materials are required to be added into the original pure water jet to form an abrasive material jet. The existing abrasive mixing and spraying device generally utilizes the venturi principle to suck the abrasive, mix the abrasive with high-pressure jet flow and spray the abrasive out to crush and cut the rock. However, the mixed abrasive jet is destructive to the internal structure of the nozzle, severely affecting the service life of the jet device.
In view of this, the present inventors have devised a high-pressure water jet mixed abrasive injection device through repeated experiments according to production design experience in the field and related fields for many years, so as to solve the problems in the prior art.
Disclosure of Invention
The invention provides a high-pressure water jet mixed abrasive jetting device which can carry out secondary utilization or cyclic utilization on chip particles, old abrasive materials and the like, and resources are saved.
In order to achieve the above object, the present invention provides a high-pressure water jet mixed abrasive spraying device, wherein the high-pressure water jet mixed abrasive spraying device comprises a spray head body, the spray head body is provided with a jet channel penetrating along an axial direction, the jet channel comprises an inlet section, a contraction section and a diffusion section which are sequentially arranged, the inner diameter of the contraction section is smaller than the inner diameter of the inlet section and the inner diameter of the diffusion section respectively, an abrasive input channel and a debris suction channel are further arranged in the spray head body respectively, one end of the abrasive input channel is opened at the side wall of the spray head body, the other end of the abrasive input channel is communicated with the contraction section, one end of the debris suction channel is opened at the side wall of the spray head body, and the other end of the debris suction channel is communicated with the contraction section.
The high-pressure water jet mixed abrasive spraying device comprises the shrinkage section, wherein the wear-resistant pipe fitting is detachably arranged on the shrinkage section, the outer wall of the wear-resistant pipe fitting is in sealing fit with the inner wall of the shrinkage section, the wear-resistant pipe fitting is provided with a through cavity which is formed along the axial direction of the jet flow channel, a first connecting port which is communicated with the abrasive input channel is formed in the side wall of the wear-resistant pipe fitting, and a second connecting port which is communicated with the debris suction channel is formed in the side wall of the wear-resistant pipe fitting.
The high-pressure water jet mixed abrasive spraying device comprises the abrasion-resistant pipe fitting, wherein the abrasion-resistant pipe fitting comprises an acceleration throat pipe and a mixing throat pipe, the acceleration throat pipe is communicated with the inlet section, and the mixing throat pipe is communicated with the diffusion section.
The high-pressure water jet mixed abrasive injection device comprises an inlet section, a shrinkage section, a first limiting step, an accelerating section, a first accelerating cavity, a second accelerating cavity, a first limiting step, a second limiting step, a third limiting step, a fourth limiting step and a fourth limiting step, wherein the accelerating section is detachably arranged in the inlet section and is columnar, the outer wall of the accelerating section is in sealing fit with the inner wall of the inlet section, one end of the accelerating section is propped against the first limiting step, and the accelerating section is further provided with an accelerating cavity which penetrates through the jet flow channel in the axial direction.
The high-pressure water jet mixed abrasive spraying device is characterized in that the first connecting port is formed in the side wall of the mixing throat, and the second connecting port is formed in the side wall of the accelerating throat.
The high-pressure water jet mixed abrasive spraying device is characterized in that the first connecting port and the second connecting port are respectively formed in the side wall of the mixing throat.
The high-pressure water jet mixed abrasive spraying device is characterized in that the first connecting port and the second connecting port are respectively formed in the side wall of the accelerating throat pipe.
The high-pressure water jet mixed abrasive injection device is characterized in that the compression screw cover is detachably arranged in the diffusion section, an injection cavity penetrating along the axial direction of the jet channel is formed in the compression screw cover, and the inner diameter phi 4 of the injection cavity is larger than the inner diameter phi 3 of the mixing throat.
The high-pressure water jet mixed abrasive spraying device is characterized in that the filter screw cover is detachably arranged in the debris suction channel, and a plurality of through holes which are formed along the axial direction of the debris suction channel are uniformly distributed on the filter screw cover.
The high-pressure water jet mixed abrasive spraying device comprises the abrasive input joint, one end of the abrasive input joint is detachably connected with the abrasive input channel, and the other end of the abrasive input joint is connected with the sand conveying pipeline.
The high-pressure water jet mixed abrasive spraying device comprises the high-pressure water jet mixed abrasive spraying device, wherein the high-pressure water jet mixed abrasive spraying device further comprises a high-pressure water input connector, one end of the high-pressure water input connector is detachably connected with the spray head body, and the other end of the high-pressure water input connector is connected with a high-pressure water pipe.
The high-pressure water jet mixed abrasive spraying device provided by the invention has the following characteristics and advantages:
According to the high-pressure water jet mixed abrasive jetting device provided by the invention, the debris particles and the old abrasive generated in the rock breaking process are self-absorbed and conveyed into the contraction section by utilizing the debris suction channel, so that the secondary utilization or cyclic utilization of the debris particles, the old abrasive and the like is realized, the rock breaking effect is improved, and resources are saved.
The high-pressure water jet mixed abrasive jetting device provided by the invention reduces the requirements of the high-pressure water mixed abrasive jet technology on the cleanliness, uniformity and the like of the abrasive, almost all hard particles can be used as the abrasive to be sucked or pressed into a jet channel to be mixed with the high-speed water jet, and then the abrasive is jetted out to break and cut the brittle materials such as rock and the like, so that the abrasive purchasing cost is reduced.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic diagram of an embodiment of a high-pressure water jet mixed abrasive jet device according to the present invention;
FIG. 2 is a schematic view of another embodiment of a high-pressure water jet mixed abrasive jet device according to the present invention;
FIG. 3 is a schematic view of a structure of a spray head body according to the present invention;
FIG. 4 is a schematic view of the structure of the filter screw cap of the present invention;
FIG. 5 is a schematic view of an abrasive input joint according to the present invention;
fig. 6 is a schematic structural view of the high-pressure water input joint in the invention.
Reference numerals illustrate:
100. A high pressure water jet mixed abrasive jetting device; 10. A nozzle body;
11. a jet channel; 111. An inlet section;
112. a constriction section; 113. A diffusion section;
12. An abrasive input channel; 13. A debris intake passage;
20. Wear-resistant pipe fittings; 201. A first connection port;
202. A second connection port; 21. Accelerating the throat;
22. a mixing throat; 30. An acceleration section;
31. an acceleration chamber; 40. A compression screw cover;
41. a spray chamber; 50. An abrasive input joint;
51. a lock nut; 60. A filter screw cap;
61. A through hole; 70. A high pressure water input connector;
200. a high pressure water line; 300. Sand conveying pipeline.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. The specific embodiments of the invention described herein are for purposes of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.
Referring to fig. 1 to 6, a high-pressure water jet mixed abrasive spraying device 100 according to the present invention includes a spraying head body 10, the spraying head body 10 has a jet channel 11 penetrating along an axial direction, the jet channel 11 includes an inlet section 111, a constriction section 112 and a diffusion section 113 sequentially arranged, the inner diameter of the constriction section 112 is smaller than the inner diameter of the inlet section 111 and the inner diameter of the diffusion section 113, an abrasive input channel 12 and a debris suction channel 13 are respectively provided in the spraying head body 10, one end of the abrasive input channel 12 is opened at a side wall of the spraying head body 10, the other end of the abrasive input channel 12 is communicated with the constriction section 112, one end of the debris suction channel 13 is opened at a side wall of the spraying head body 10, and the other end of the debris suction channel 13 is communicated with the constriction section 112.
According to the high-pressure water jet mixed abrasive spraying device 100 provided by the invention, high-pressure water flow conveyed by the high-pressure water pipeline 200 enters the jet channel 11 from the inlet section 111 and is sprayed out from the diffusion section 113, negative pressure is generated in the contraction section 112, the abrasive in the abrasive input channel 12 (conveyed by the sand conveying pipeline 300), old abrasive and debris mixture in the debris suction channel 13 are sucked into the jet channel 11 at the same time, the sucked abrasive and debris are mixed with the high-pressure water jet in the contraction section 112 to form mixed abrasive, and the mixed abrasive is finally sprayed out from the diffusion section 113, so that rock is crushed and cut.
According to the high-pressure water jet mixed abrasive injection device 100 provided by the invention, the debris particles and the old abrasive generated in the rock breaking process are self-absorbed and conveyed into the contraction section 112 by utilizing the debris suction channel 13, so that the secondary utilization or cyclic utilization of the debris particles and the old abrasive is realized, the rock breaking effect is improved, and resources are saved.
The high-pressure water jet mixed abrasive jetting device 100 provided by the invention reduces the requirements of the high-pressure water mixed abrasive jet technology on the cleanliness, uniformity and the like of the abrasive, almost all hard particles can be used as the abrasive to be sucked or pressed into a jet channel to be mixed with the high-speed water jet and then jetted out to break and cut the brittle materials such as rock and the like, and the abrasive purchasing cost is reduced.
In an alternative embodiment of the present invention, the contraction section 112 is detachably provided with a wear-resistant pipe 20, the outer wall of the wear-resistant pipe 20 is in sealing fit with the inner wall of the contraction section 112, the wear-resistant pipe 20 is provided with a through cavity which is opened along the axial direction of the jet flow channel 11, the side wall of the wear-resistant pipe 20 is provided with a first connection port 201 which is communicated with the abrasive material input channel 13, and the side wall of the wear-resistant pipe 20 is also provided with a second connection port 202 which is communicated with the debris suction channel 13. The wear-resistant pipe fitting 20 is arranged on the contraction section 112, high-pressure jet flow, abrasive and fragments are mixed in a through cavity of the wear-resistant pipe fitting 20, damage of the abrasive and the fragments to the inner wall of the contraction section 112 caused by direct impact, rolling, extrusion, friction and the like is avoided, the wear-resistant pipe fitting 20 is replaced after the high-pressure water jet flow mixed abrasive spraying device 100 is used for a period of time, and the service life of the high-pressure water jet flow mixed abrasive spraying device 100 is prolonged.
In an alternative example of this embodiment, the abrasion resistant tube 20 includes an accelerating throat 21 and a mixing throat 22, the accelerating throat 21 is in communication with the inlet section 111, the mixing throat 22 is in communication with the diffuser section 113, and the inner diameter Φ 2 of the accelerating throat 21 is less than or equal to the inner diameter Φ 3 of the mixing throat 22. The inner diameter phi 3 of the mixing throat 22 is larger than the inner diameter of the accelerating throat 21, so that high-pressure water flow transmitted by the accelerating throat 21 can be dispersed, the abrasion degree of the high-pressure water flow on the pipe wall is effectively relieved, and the service life is prolonged.
In an alternative example, a first limiting step is formed between the inlet section 111 and the contraction section 112, the accelerating section 30 is detachably installed in the inlet section 111, the accelerating section 30 is in a column shape, the outer wall of the accelerating section 30 is in sealing fit with the inner wall of the inlet section 111, one end of the accelerating section 30 abuts against the first limiting step, the accelerating section 30 is provided with an accelerating cavity 31 which is axially penetrated along the jet flow channel 11, the inner diameter phi 1 of the accelerating cavity 31 is less than or equal to the inner diameter phi 2 of the accelerating throat 21, and the accelerating section can play a role in accelerating high-pressure water flow.
Further, a groove for placing an O-shaped sealing ring is formed in the end face (a plane matched with the first limiting step) of the accelerating joint 30, and is used for placing the O-shaped sealing ring, and the O-shaped sealing ring can block up and down air flow to play a role in sealing.
Because the inner diameter phi 1 of the accelerating joint 30, the inner diameter phi 2 of the accelerating throat 21 and the inner diameter phi 3 of the mixing throat 22 are sequentially increased, the high-pressure water flow transmitted by the inlet section 111 can be dispersed step by step, the abrasion degree of the pipe wall caused by the high-pressure water flow is relieved, and the service life of the abrasion-resistant pipe fitting 20 (the accelerating throat 21 and the mixing throat 22) is prolonged.
In the embodiment, the inner diameter Φ 1 of the accelerating cavity 31 is smaller than or equal to the inner diameter Φ 2 of the accelerating throat 21 and smaller than or equal to the inner diameter Φ 3 of the mixing throat 22, and the high-pressure water flow P 0 generated by the high-pressure water generator is conveyed into the jet channel 11 of the nozzle body 10; then the high-pressure water P 0 is converted into high-speed jet water V through the accelerating joint 30, and meanwhile, low pressure or negative pressure P 2 is generated at the inner wall of the inner diameter phi 1 of the accelerating joint 30 due to the Venturi effect; at the abrasive feed channel 12 there will be a pressure (P 3′+P1') combined with the abrasive delivery pressure P 1 by a low or negative pressure P 3, through which abrasive feed channel 12 special abrasive can be sucked and pressed very efficiently, either dry or mixed with liquid, and smoothly delivered into the wear pipe 20 (accelerating throat 21 or mixing throat 22).
Meanwhile, when the high-speed jet flows through the accelerating throat 21 and the mixing throat 22, a low pressure (or negative pressure) P 3,P3 is generated at the debris intake passage 13 and is smaller than P 0、P1 and the atmospheric pressure; the low pressure or negative pressure P 3 automatically sucks mixed liquid or abrasive generated in the rock breaking process through the debris suction channel 13, mixes the mixed liquid or abrasive with high-speed jet flow in the accelerating throat 21 or the mixing throat 22 and special abrasive conveyed by the abrasive input pipeline 12, and ejects the mixed liquid or abrasive through the diffusion section 113 again to break the rock.
In an alternative example, the side wall of the mixing throat 22 is provided with a first connection port 201, and the side wall of the accelerating throat 21 is provided with a second connection port 202. The debris intake passage 13 communicates with the acceleration throat 21 through the second connection port 202 and naturally sucks in the mixture of debris and old abrasive by negative pressure, and the abrasive input passage 12 communicates with the mixing throat 22 through the first connection port 201 and presses in the mixture of abrasive by P1. Because the inner diameter phi 3 of the mixing throat 22 is larger than the inner diameter phi 2 of the accelerating throat 21, under the same P 0 jet flow condition, negative pressures with different degrees are formed in the mixing throat 22 and the accelerating throat 21, and experiments show that the natural suction of the abrasive mixed liquid through the debris suction channel 13 is less, the speed is low, and the abrasion loss to the accelerating throat 21 is small; the abrasive input channel 12 has large amount of abrasive pressed in, high speed and large abrasion loss to the mixing throat 22; the service lives of the two are inconsistent, so that the accelerating throat 23 and the mixing throat 22 are arranged separately, different service lives can be designed conveniently, or the mixing throat 22 can be replaced conveniently under the working condition of high abrasion, and the manufacturing and maintenance cost is reduced.
In another alternative example, the two opposite side walls of the mixing throat 22 are respectively provided with a first connection port 201 and a second connection port 202, that is, the inner cavity of the mixing throat 22 is used as a non-closed mixing cavity for high-pressure water flow, abrasive and chips while guiding the high-pressure water flow.
In yet another alternative example, the two opposite side walls of the accelerating throat 21 are respectively provided with a first connection port 201 and a second connection port 202, that is, the inner cavity of the mixing throat 22 is used as a non-closed mixing cavity for high-pressure water flow, abrasive and chips while guiding the high-pressure water flow.
In the present invention, the accelerating joint 30 and the mixing throat 22 may be installed according to the actual situation. If the accelerating joint 30 is omitted, the accelerating throat 21 converts high-pressure water flow P 0 into high-speed jet water V by adjusting the inner diameter phi 2 of the accelerating throat 21, and meanwhile, low pressure or negative pressure is generated at the inner wall of the inner diameter phi 2 due to the venturi principle; if the mixing throat 22 is omitted and only the accelerating throat 21 is used, the abrasive or the mixed liquid is mixed with the high-speed water jet within the inner diameter Φ 2 of the accelerating throat 21, and is ejected again through the diffuser 113, thereby breaking the rock.
In the invention, the axis L 2 of the abrasive material input channel 12, the common axis L 1 of the accelerating joint 30, the accelerating throat 21 and the mixing throat 22 have an included angle theta 2, and theta 2 is less than or equal to 0 and less than or equal to 90 degrees; meanwhile, an included angle theta 3 is formed between the axis L 3 of the debris suction channel 13 and the common axis L 1 of the accelerating joint 30, the accelerating throat 21 and the mixing throat 22, and theta 3 is less than or equal to 0 DEG and less than or equal to 90 DEG, and in the range, the input grinding material or mixed liquid and the high-speed jet V have the best mixing effect and the best rock breaking effect (both deep and wide).
In the invention, the length of the accelerating throat 21 is H 0, the length of the mixing throat 22 is H 1, the distance between the intersection point O 2 of the abrasive input channel axis L 2 and the common axis L 1 of the accelerating joint 30, the accelerating throat 21 and the mixing throat 22 and the intersection point O1 of the matching surface (first limiting step) of the nozzle body 10 and the accelerating joint 30 and the axis L 1 is H 2, and experiments show that when the relation of H 2﹤(H0+H1 is maintained, the optimal distance exists for H2, the mixing effect of the input abrasive or the mixed liquid and the high-speed jet V is optimal within the optimal distance, and the rock breaking effect is optimal (deep and wide).
Further, the distance H 3 between the intersection point 0 2 of the axis L 3 of the debris intake passage 13 and the axes L 1 of the acceleration joint 30, the acceleration throat 21, and the mixing throat 22 and the intersection point O 1 of the mating surface (first limit step) of the nozzle body 10 and the acceleration joint 30 and the axis L1 is the optimum distance H 3 where the mixing effect of the inputted abrasive or mixed liquid and the high-speed jet V is optimum (both deep and wide) while maintaining the relationship of H 3﹤(H0+H1.
When the high-pressure water jet mixed abrasive spraying device 100 provided by the invention is applied to the conditions of weak abrasive wear and convenient maintenance and replacement, one of the accelerating throat 21 and the mixing throat 22 is selected, the abrasive input channel 12 and the debris suction channel 13 are connected with the accelerating throat 21 or the mixing throat 22, and the relationship of H 3﹤H2 is maintained, so that the total size of the device is reduced, and the use amount of wear-resistant materials is reduced. Also, when in relation to H 3﹤H2, the self-priming capability at the debris intake channel 13 is not disturbed by the abrasive input at the abrasive input channel 12, is stable and independent, namely P 3﹤P3′+P1'.
In an alternative example of this embodiment, the diffuser 113 is detachably provided with a hold-down screw cap 40, and the hold-down screw cap 40 is provided with a spray cavity penetrating along the axial direction of the jet channel 11, and the inner diameter Φ 4 of the spray cavity 11 is larger than the inner diameter Φ 3 of the mixing throat 22. The injection cavity is an injection channel of the mixed fluid of the high-pressure water flow and the abrasive, and is used for injecting the mixed fluid of the high-pressure water flow and the abrasive to the rock to break the rock.
In an alternative example, the outer wall of the compression screw cover 40 is provided with threads to be matched with the threads of the inner wall of the diffusion section 113, so that the compression screw cover 40 is detachably connected with the nozzle body 10, and the compression screw cover 40 locks and fixes the accelerating throat pipe 21 and the mixing throat pipe 22 in the nozzle body 10; and the accelerating throats 21 and the mixing throats 22 can be protected from being damaged by rock impact, rolling, extrusion, friction and the like, so that the service lives of the accelerating throats and the mixing throats are prolonged.
In an alternative example of the present invention, the high-pressure water jet mixed abrasive injection device 100 further includes an abrasive input joint 50, one end of the abrasive input joint 50 is connected to the abrasive input channel 12, and the other end of the abrasive input joint 50 is connected to the sand conveying line for conveying the abrasive.
In an alternative example, the abrasive input joint 50 is tubular and has an external thread on the outer wall of one end of the abrasive input joint 50 and is threadedly connected to the inner wall of the abrasive input channel 12.
Further, an internal thread is also provided on the inner wall of the first connection port 201 for connecting with the abrasive input joint 50.
Further, the abrasive input joint 50 is further sleeved with a lock nut 51, when the included angle between the abrasive channel 12 and the outer side wall of the nozzle body 10 is smaller than 90 °, a right-angle groove with a certain depth is formed at the tangential position of the abrasive input channel 12 and the outer side wall (outer surface) of the nozzle body 10, and the lock nut 51 is used for placing the lock nut 51, and the lock nut 51 is in threaded engagement with the abrasive input joint 50 and locks the abrasive input joint 50 on the nozzle body 10.
In an alternative embodiment of the present invention, the debris intake passage 13 is detachably provided with a filter screw cover 60, and a plurality of through holes 61 opened in an axial direction of the debris intake passage 13 are uniformly distributed on the filter screw cover 60. The through hole 61 of the filter screw cap 60 is processed into a small aperture by using a tool such as a milling and drilling machine, so that the abrasive with a proper particle size can pass through, and the functions of screening and filtering the scraps and the abrasive can be achieved. The small-aperture through holes 61 on the filter screw cover 60 have certain strength, can bear a certain degree of impact, are not easy to deform, are separated from each other, and are not easy to accumulate and block.
In an alternative example, the outer wall of the filter screw cap 60 is provided with external threads, and the filter screw cap 60 is detachably coupled to the inner wall of the debris intake passage 13 through the external threads.
Further, when the debris intake channel 13 is not required for self-priming abrasive, the filter screw cap 60 can be replaced with a solid screw cap to close the debris intake channel 13.
In an alternative embodiment of the invention, the internal diameter of the debris intake passage 13 is greater than the internal diameter of the abrasive input passage 12.
In an alternative embodiment of the present invention, the high-pressure water jet mixed abrasive spraying device 100 further includes a high-pressure water input connector 70, one end of the high-pressure water input connector 70 is connected to the inlet section 111, and the other end of the high-pressure water input connector 70 is connected to the high-pressure water pipe for delivering the high-pressure water flow, and with the above structure, not only the abrasive input connector 50 is detachably connected to the spray head body 10, but also the accelerating section 30 is locked and fixed in the inlet section 111.
In an alternative example, an O-ring is also provided between the high pressure water input fitting 70 and the spray head body 10 to seal against water leakage.
The detailed explanation of the embodiments described above is only for the purpose of explaining the present invention so as to enable a better understanding of the present invention, but these descriptions should not be construed as limiting the present invention in any way, and in particular, the individual features described in the different embodiments may be arbitrarily combined with each other to constitute other embodiments, and these features should be understood as being applicable to any one embodiment, except as explicitly stated to the contrary, without being limited to only the described embodiment.
Claims (6)
1. The high-pressure water jet mixed abrasive spraying device is characterized by comprising a spraying head body, wherein the spraying head body is provided with a jet channel which is penetrated along the axial direction, the jet channel comprises an inlet section, a contraction section and a diffusion section which are sequentially arranged, the inner diameter of the contraction section is respectively smaller than the inner diameter of the inlet section and the inner diameter of the diffusion section, an abrasive material input channel and a debris suction channel are respectively formed in the spraying head body, one end of the abrasive material input channel is opened on the side wall of the spraying head body, the other end of the abrasive material input channel is communicated with the contraction section, one end of the debris suction channel is opened on the side wall of the spraying head body, and the other end of the debris suction channel is communicated with the contraction section;
the abrasion-resistant pipe fitting comprises an accelerating throat and a mixing throat, the debris suction channel is communicated with the accelerating throat and naturally sucks the mixed liquid of the debris and the old abrasive through negative pressure, and the abrasive input channel is connected with the mixing throat and is pressed into the mixed liquid of the abrasive;
An accelerating joint is detachably arranged in the inlet section, and the accelerating joint is also provided with an accelerating cavity which is penetrated along the axial direction of the jet flow channel;
the inner diameter of the accelerating cavity is smaller than the inner diameter of the accelerating throat tube is smaller than the inner diameter of the mixing throat tube;
The diffusion section can be detachably provided with a compression screw cover, an injection cavity which is penetrated along the axial direction of the jet flow channel is formed in the compression screw cover, and the inner diameter of the injection cavity is larger than that of the mixing laryngeal tube;
the high-pressure water jet mixed abrasive injection device further comprises an abrasive input connector, one end of the abrasive input connector is detachably connected with the abrasive input channel, and the other end of the abrasive input connector is connected with the sand conveying pipeline;
High-pressure water flow generated by the high-pressure water generator is conveyed into a jet flow channel of the nozzle body; then high-pressure water P 0 is converted into high-speed jet water through an accelerating joint, and low pressure or negative pressure P 2 is generated at the inner wall of the accelerating joint; at the abrasive input channel there will be a pressure P 3+P1 combined with an abrasive delivery pressure P 1 by a low or negative pressure P 3;
Creating a low or negative pressure P 3,P3 at the debris intake passage as the high velocity jet flows through the accelerating throat, the mixing throat, less than P 0、P1 or atmospheric pressure; the low pressure or negative pressure P 3 automatically sucks mixed liquid or abrasive generated in the rock breaking process through the debris suction channel and mixes the mixed liquid or abrasive with the accelerating throat or high-speed jet flow in the mixing throat and special abrasive conveyed by the abrasive input pipeline;
An included angle theta 2 is formed between the axis L 2 of the abrasive material input channel and the common axis L 1 of the accelerating joint, the accelerating throat and the mixing throat, and theta 2 is less than 0 and less than or equal to 90 degrees; an included angle theta 3 is formed between the axis L 3 of the debris suction channel and the common axis L 1 of the accelerating joint, the accelerating throat and the mixing throat, and theta 3 is equal to 90 degrees;
The length of the accelerating throat pipe is H 0, the length of the mixing throat pipe is H 1, the distance between the intersection point O 2 of the abrasive material input channel axis L 2 and the common axis L 1 of the accelerating joint, the accelerating throat pipe and the mixing throat pipe and the intersection point O 1 of the matching surface of the nozzle body and the accelerating joint and the axis L 1 is H 2, and H 2﹤H0+H1 is kept;
The intersection point 0 2 of the axis L 3 of the debris suction channel and the axes L 1 of the accelerating joint, the accelerating throat and the mixing throat is a distance H 3 from the intersection point O 1 of the matching surface of the nozzle body and the accelerating joint and the axis L 1, and H 3﹤H0+H1 is kept;
When the included angle between the abrasive material channel and the outer side wall of the nozzle body is smaller than 90 degrees, a right-angle groove with a certain depth is formed in the tangential position of the abrasive material input channel and the outer side wall of the nozzle body and is used for placing a locking nut, and the locking nut is in threaded fit with the abrasive material input joint and locks the abrasive material input joint on the nozzle body;
A filter screw cover is detachably arranged in the debris suction channel, and a plurality of through holes which are formed along the axial direction of the debris suction channel are uniformly distributed on the filter screw cover; when the debris suction channel is not needed to be used for self-sucking the abrasive, the filter screw cap is replaced by a solid screw cap to seal the debris suction channel;
the debris intake passage has an inner diameter greater than an inner diameter of the abrasive input passage.
2. The high-pressure water jet mixed abrasive spraying device according to claim 1, wherein the outer wall of the wear-resistant pipe fitting is in sealing fit with the inner wall of the contraction section, the wear-resistant pipe fitting is provided with a through cavity which is formed along the axial direction of the jet flow channel, a first connecting port which is communicated with the abrasive input channel is formed in the side wall of the wear-resistant pipe fitting, and a second connecting port which is communicated with the debris suction channel is formed in the side wall of the wear-resistant pipe fitting.
3. The high pressure water jet mixed abrasive blasting apparatus according to claim 2, wherein said accelerating throat is in communication with said inlet section, and said mixing throat is in communication with said diffuser section.
4. The high-pressure water jet mixed abrasive injection device according to claim 3, wherein a first limiting step is formed between the inlet section and the contraction section, the accelerating section is columnar, the outer wall of the accelerating section is in sealing fit with the inner wall of the inlet section, and one end of the accelerating section abuts against the first limiting step.
5. The high-pressure water jet mixed abrasive jetting device as claimed in claim 3, wherein the first connection port is provided on a side wall of the mixing throat, and the second connection port is provided on a side wall of the accelerating throat.
6. The high pressure water jet mixed abrasive blasting apparatus of claim 1, further comprising a high pressure water input fitting, wherein one end of the high pressure water input fitting is detachably connected to the nozzle body, and wherein the other end of the high pressure water input fitting is connected to a high pressure water pipe.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4648215A (en) * | 1982-10-22 | 1987-03-10 | Flow Industries, Inc. | Method and apparatus for forming a high velocity liquid abrasive jet |
| CN109025825A (en) * | 2018-10-10 | 2018-12-18 | 东北石油大学 | The self-priming particle stream flow drilling rig in underground based on Venturi effect |
| CN113967547A (en) * | 2021-11-09 | 2022-01-25 | 中铁工程装备集团有限公司 | Injection device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1765582A (en) * | 2005-09-29 | 2006-05-03 | 江苏大学 | High pressure abrasive water jet cutting head device and mixing tube |
| CN103556947B (en) * | 2013-11-15 | 2015-12-30 | 重庆大学 | A kind of coal mine underground self-suction abrasive jet flow drill bit and boring method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4648215A (en) * | 1982-10-22 | 1987-03-10 | Flow Industries, Inc. | Method and apparatus for forming a high velocity liquid abrasive jet |
| CN109025825A (en) * | 2018-10-10 | 2018-12-18 | 东北石油大学 | The self-priming particle stream flow drilling rig in underground based on Venturi effect |
| CN113967547A (en) * | 2021-11-09 | 2022-01-25 | 中铁工程装备集团有限公司 | Injection device |
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