CN113997204A - Jet device for jet flow back mixing abrasive - Google Patents
Jet device for jet flow back mixing abrasive Download PDFInfo
- Publication number
- CN113997204A CN113997204A CN202111323555.6A CN202111323555A CN113997204A CN 113997204 A CN113997204 A CN 113997204A CN 202111323555 A CN202111323555 A CN 202111323555A CN 113997204 A CN113997204 A CN 113997204A
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- Prior art keywords
- abrasive
- jet
- nozzle
- annular
- post
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Links
- 238000002156 mixing Methods 0.000 title claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000011148 porous material Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000003082 abrasive agent Substances 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005422 blasting Methods 0.000 claims 4
- 238000005270 abrasive blasting Methods 0.000 claims 3
- 239000011435 rock Substances 0.000 abstract description 19
- 230000005641 tunneling Effects 0.000 abstract description 7
- 238000007789 sealing Methods 0.000 description 12
- 238000005507 spraying Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 8
- 230000001133 acceleration Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/02—Abrasive blasting machines or devices; Plants characterised by the arrangement of the component assemblies with respect to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
- B24C5/04—Nozzles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (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)
Abstract
The invention provides a jet device for jet flow back mixing abrasive, which comprises: a spray head body provided with a spray outlet; the abrasive nozzle is arranged on the spray head body, a ring cavity surrounding the abrasive nozzle is arranged in the spray head body, and the spray outlet is communicated with the ring cavity; the fluid input joint is arranged on the spray head body and communicated with the annular cavity; the grinding nozzle is provided with a grinding material pore passage which is communicated with the annular cavity. According to the invention, the tunneling efficiency of the tunnel boring machine on the hard rock is improved.
Description
Technical Field
The invention relates to the technical field of tunneling equipment, in particular to a jet device for jet flow rear mixed abrasive.
Background
At present, a Tunnel Boring Machine (TBM) is a main device for hard rock tunneling and has the characteristics of safety, high efficiency and environmental protection in construction. In order to improve the tunneling efficiency, a nozzle is usually added on a cutter head of the TBM, and the nozzle sprays high-pressure water jet outwards, and the high-pressure water jet assists in breaking rock. In some cases, the abrasive can be added into the high-pressure water jet, the abrasive hardness is high, and rock breaking is performed by using the abrasive, so that the rock breaking efficiency is further improved. However, the prior art has the technical problem that the tunneling efficiency of the tunnel boring machine to the hard rock is low.
Disclosure of Invention
The invention aims to provide a jet device for jet flow rear mixing abrasive to improve the tunneling efficiency of a tunnel boring machine on hard rock.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a jet device for mixing abrasive material after jet, which comprises: a spray head body provided with a spray outlet; the abrasive nozzle is arranged on the spray head body, a ring cavity surrounding the abrasive nozzle is arranged in the spray head body, and the spray outlet is communicated with the ring cavity; the fluid input joint is arranged on the spray head body and communicated with the annular cavity; the grinding nozzle is provided with a grinding material pore passage which is communicated with the annular cavity.
In a preferred embodiment, the abrasive duct is arranged coaxially with the ejection outlet, and the annular chamber is annular and coaxial with the abrasive duct.
In a preferred embodiment, the fluid input joint is arranged on the side surface of the annular cavity, and the fluid input direction of the fluid input joint is perpendicular to the axial direction of the annular cavity.
In a preferred embodiment, the outer side wall of the discharge end of the abrasive nozzle is provided with a jet groove.
In a preferred embodiment, the abrasive nozzle has a first base portion and a discharge end portion, which are sequentially distributed in a flow direction of the abrasive, the outer diameter of the discharge end portion is smaller than that of the first base portion, and the jet groove extends from the first base portion to the discharge end portion.
In a preferred embodiment, the abrasive nozzle has a second base portion and a positioning baffle ring, the positioning baffle ring includes an annular body and a plurality of protruding portions connected to a side wall of the annular body, the annular body is connected to a discharge end of the second base portion, the plurality of protruding portions are distributed at intervals around the circumference of the annular body, and a fluid groove is formed between two adjacent protruding portions.
In a preferred embodiment, the annular cavity comprises a first cylindrical cavity part, a first conical cavity part and a second cylindrical cavity part which are distributed in sequence along the flow direction of the abrasive, and the inner diameter of the second cylindrical cavity part is smaller than that of the first cylindrical cavity part; the outer wall of the bulge part is attached to the inner wall of the first cylindrical cavity part and the inner wall of the conical cavity part.
In a preferred embodiment, the abrasive tip has an abrasive tip head attached to the feed end of the second base, the abrasive tip head being mounted to the nozzle body.
In a preferred embodiment, the jetting device comprises a jet flow conduit, the jet flow conduit is mounted at the jetting outlet, the jet flow conduit comprises a second conical cavity part and a third cylindrical cavity part, the second conical cavity part and the third cylindrical cavity part are sequentially distributed along the flow direction of the abrasive, and the second conical cavity part and the third cylindrical cavity part are coaxially arranged with the abrasive duct.
In a preferred embodiment, the jetting device comprises a high-pressure water generator, an abrasive supply tank and a filtering mechanism, the high-pressure water generator is connected with the fluid input joint, and the abrasive supply tank and the filtering mechanism are both connected with the abrasive nozzle.
The invention has the characteristics and advantages that:
high-pressure water enters the annular cavity through the fluid input joint and flows to the jet outlet through a gap between the discharge end of the abrasive nozzle and the inner wall of the annular cavity to form high-speed jet flow, low pressure or negative pressure is generated at the discharge end of the abrasive nozzle due to the Venturi effect and generates suction force to drive abrasive materials outside the abrasive nozzle to enter the abrasive material pore passage and flow to the discharge end of the abrasive nozzle, the abrasive materials flow out through the abrasive material pore passage and are mixed with the high-speed jet flow of the high-pressure water, the high-speed jet flow wraps the abrasive materials and flow to the jet outlet together, and the high-speed jet flow and the abrasive materials are further mixed and accelerated in the flowing process to form abrasive material jet flow which is jetted to a workpiece or a rock surface to cut and break rock. The high-speed jet flow surrounds the abrasive nozzle, the abrasive is added from the center of the high-speed jet flow and is wrapped by the high-speed jet flow for acceleration, and the acceleration effect is improved. Through this injection apparatus, improved fluidic impact velocity and broken rock efficiency, increased broken rock volume, improved the tunnelling efficiency of tunnel boring machine to hard rock.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a post-jet abrasive mixing jet apparatus provided in the present invention;
FIGS. 2-4 are schematic views of an abrasive tip in the jetting device shown in FIG. 1;
FIG. 5 is a schematic structural diagram of another embodiment of a post-jet abrasive mixing jet apparatus provided in the present invention;
FIG. 6 is a schematic diagram of the operation of the spraying device shown in FIG. 5;
FIGS. 7-12 are schematic views of an abrasive tip in the jetting device shown in FIG. 5;
FIG. 13 is a schematic diagram of a fluidic conduit in a spray device provided by the present invention;
fig. 14 is a schematic structural view of a spray head body in the spray device provided by the present invention.
The reference numbers illustrate:
10. a spray head body; 11. a spray outlet;
20. an annular cavity; 21. a first cylindrical cavity portion; 22. a second cylindrical cavity portion; 23. a first conical cavity portion;
30. an abrasive nozzle; 301. abrasive tunnels; 302. a jet chute; 303. a fluid tank;
31. a first base part; 32. a discharge end;
33. a second base part; 34. positioning a baffle ring; 341. an annular body; 342. a boss portion; 35. an abrasive tip head;
40. a fluid input fitting;
50. a jet conduit; 51. a second conical cavity portion; 52. a third cylindrical cavity portion; 53. a conduit compression screw stop;
61. a high pressure water generator; 611. a high pressure water line; 62. an abrasive supply tank; 621. a sand conveying pipeline; 63. a pressure gauge; 64. a filtering mechanism;
70. and (5) sealing rings.
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.
The present invention provides a jet apparatus for post-jet mixing of abrasives, as shown in fig. 1, 5 and 6, the jet apparatus comprising: the abrasive jet comprises a jet body 10, an abrasive nozzle 30 and a fluid input joint 40 arranged on the jet body 10, wherein the jet body 10 is provided with a jet outlet 11; the abrasive nozzle 30 is arranged on the spray head body 10, a ring cavity 20 surrounding the abrasive nozzle 30 is arranged in the spray head body 10, and the jet outlet 11 is communicated with the ring cavity 20; the fluid input connector 40 is communicated with the annular cavity 20; the abrasive tip 30 is provided with an abrasive channel 301, and the abrasive channel 301 is communicated with the annular cavity 20.
High-pressure water enters the annular cavity 20 through the fluid input connector 40 and flows to the jet outlet 11 through a gap between the discharge end of the abrasive nozzle 30 and the inner wall of the annular cavity 20 to form high-speed jet flow, the discharge end of the abrasive nozzle 30 generates low pressure or negative pressure due to Venturi effect, the low pressure or negative pressure generates suction force to drive abrasive outside the abrasive nozzle 30 to enter the abrasive pore channel 301 and flow to the discharge end of the abrasive nozzle 30, the abrasive flows out of the abrasive pore channel 301 and is mixed with the high-speed jet flow of the high-pressure water, the high-speed jet flow wraps the abrasive and flows to the jet outlet 11, and the high-speed jet flow and the abrasive are further mixed and accelerated in the flowing process to form abrasive jet flow which is jetted to a workpiece or a rock surface to cut and break rock. The high-speed jet flow surrounds the abrasive nozzle 30, the abrasive is added from the center of the high-speed jet flow and is wrapped by the high-speed jet flow for acceleration, and the acceleration effect is improved.
Through the jet device, the impact speed and the rock breaking efficiency of jet flow are improved, the rock breaking amount is increased, and the tunneling efficiency of the tunnel boring machine on hard rock is improved; the cutter head is convenient to be applied to working conditions of high impact, high abrasion and high vibration of a tunnel boring machine cutter head for cutting rocks, and the durability is improved; in addition, the spraying device has lower requirements on the cleanliness and the unicity of the grinding materials, and local materials are convenient to obtain; in the mixing and accelerating process of the abrasive in the spraying device, the abrasion to the abrasive nozzle 30 and the spraying outlet 11 is small, and the service life of each part is prolonged; the key parts such as the grinding nozzle 30 and the like are made of high-wear-resistance materials with poor manufacturability.
As shown in fig. 1 and 5, the jetting apparatus includes a high pressure water generator 61 and an abrasive supply tank 62, the high pressure water generator 61 is connected to the fluid input joint 40, and the abrasive supply tank 62 is connected to the abrasive tip 30. The high pressure water generator 61 is connected to the fluid inlet connector 40 through a high pressure water pipe 611, and a pressure gauge 63 is connected to the high pressure water pipe 611. Abrasive supply tank 62 may be a dry abrasive tank or a mixed liquor abrasive supply tank 62; abrasive supply tank 62 is connected to abrasive conduit 301 of abrasive nozzle 30 via sand delivery conduit 621. The pressure at the high-pressure water generator 61 is recorded as P0, and the pressure at the upper part of the annular cavity 20 is close to P0; let the pressure at the feed supply tank be P1; the low or negative pressure at the discharge end of the abrasive tip 30 (i.e., the lower end in fig. 1 and 5) is designated as P3, with P3 being smaller due to the venturi effect. When the spraying device is positioned in the atmosphere, the spraying device is immersed in the environment with the pressure equal to the atmospheric pressure; when the spraying device is positioned in the slurry, the spraying device is immersed in the environment with the pressure equal to the pressure of the slurry. P3 is less than P0 and P3 is less than P1, and P3 is less than the immersion ambient pressure. The air or liquid carries the abrasive through the abrasive tip 30 into the middle of the high velocity jet of water propelled by the combination of P3+ P1.
As shown in fig. 1 and 5, the abrasive duct 301 is arranged coaxially with the ejection outlet 11, and the annular chamber 20 is annular and coaxial with the abrasive duct 301. The abrasive and the high-speed jet of the high-pressure water are ejected in the same direction, the high-speed jet surrounds the abrasive nozzle 30, the abrasive is added from the center of the high-speed jet and is wrapped by the high-speed jet water to flow to the ejection outlet 11, and the acceleration of the abrasive is facilitated; during the process of accelerating the mixing of the abrasives, the abrasion of the ejection outlet 11 is reduced, and the service life of the ejection device is prolonged.
In one embodiment, the fluid inlet connector 40 is disposed at the side of the annular chamber 20, and the high pressure water is diverted after entering the annular chamber 20 through the fluid inlet connector 40, and forms an annular high pressure water jet of high pressure water. Preferably, the fluid input direction of the fluid input connector 40 is perpendicular to the axial direction of the ring cavity 20. High-pressure water is connected into the annular cavity 20 from the side edge, and the direction of rotation is 90 degrees; but because the speed of the liquid flow in the area where the diversion occurs is lower, the pressure loss increase amplitude is smaller; in the bottom area of the abrasive nozzle 30, the cross-sectional area of the annular cavity 20 is reduced, the pressure energy is converted into velocity energy, the high-pressure water forms annular high-speed jet flow, the high-speed jet flow is not concentrated, the pressure loss along the wall is increased, and the high-speed jet flow energy consumption of the high-pressure water is increased.
In an embodiment of the present invention, as shown in fig. 14, the annular chamber 20 includes a first cylindrical chamber portion 21, a first conical chamber portion 23, and a second cylindrical chamber portion 22 which are sequentially distributed along the flow direction of the abrasive, and the inner diameter of the second cylindrical chamber portion 22 is smaller than that of the first cylindrical chamber portion 21, as shown in fig. 1, 5, and 14, the high-speed jet flows through the first cylindrical chamber portion 21, the first conical chamber portion 23, and the second cylindrical chamber portion 22 in sequence, and the high-speed jet is gradually accelerated due to the gradually reduced flow area.
As shown in fig. 1 and 2, the outer side wall of the discharge end of the nozzle 30 is provided with a jet flow groove 302, and the high-speed jet flows through the jet flow groove 302 to accelerate the high-speed jet. The jet grooves 302 may extend in the axial direction of the abrasive channel 301. As shown in fig. 3 and 4, the outer wall of the abrasive tip 30 may be provided with a plurality of circumferentially spaced jet grooves 302. By varying the size and number of jet slots 302, the total jet hole area, and thus the through-flow capacity of the injection device, can be controlled.
In one embodiment, the abrasive tip 30 has a first base portion 31 and a discharge end portion 32 sequentially distributed along the flow direction of the abrasive, the discharge end portion 32 has an outer diameter smaller than the outer diameter φ 5 of the first base portion 31, and the jet groove 302 extends from the first base portion 31 to the discharge end portion 32. The inner diameter phi 6 of the first cylindrical cavity part 21 is larger than the outer diameter phi 5 of the first main part 31, and the inner diameter of the abrasive channel 301 is smaller than the outer diameter of the discharge end part 32. Preferably, as shown in fig. 3, the shooting pot 302 axially covers the discharge end 32 entirely.
The outer diameter of the bottom of the jet flow groove 302 is recorded as phi 2, the inner diameter of the second cylindrical cavity part 22 is recorded as phi 3, phi 2 is smaller than phi 3, the size of phi 3-phi 2 can be adjusted to adjust the flow area, control the size of the jet flow groove 302 and optimize the flow speed and energy consumption of high-speed jet flow. In one embodiment, the discharge end 32 extends into the second cylindrical chamber section 22; further, the outer diameter of the discharge end portion 32 is equal to the inner diameter of the second cylindrical cavity portion 22. The injection device shown in fig. 1-4 realizes the functions of abrasive center input, jet flow formation, and wear-resistant nozzle fixing and positioning through the integrated abrasive nozzle 30, simplifies the structure, and improves the constraint fixing strength and the positioning accuracy of the wear-resistant nozzle.
As shown in fig. 1 and 2, the abrasive tip 30 is selectively threadably connected to the spray head. The step at the front section of the abrasive nozzle 30 is pressed against the upper end face of the nozzle body 10 to provide a pre-tightening force. The front section of the abrasive nozzle 30 is provided with a sealing ring 70 and a sealing groove, and the sealing ring 70 and the sealing groove are matched with the upper end surface of the spray head body 10 to prevent high-pressure water from leaking. The middle step of the abrasive nozzle 30 is in threaded connection with the spray head body 10, so that the functions of pre-tightening force and positioning are achieved. The discharge end 32 and the second cylindrical cavity 22 of the nozzle body 10 form a matching pair to fix and position the abrasive tip 30.
As another embodiment, the abrasive tip 30 has a second base 33 and a positioning baffle 34, as shown in fig. 5-7 and 9, the positioning baffle 34 includes an annular body 341 and a plurality of protrusions 342 connected to a sidewall of the annular body 341, the annular body 341 is connected to the discharge end of the second base 33, as shown in fig. 10-12, the plurality of protrusions 342 are spaced around the circumference of the annular body 341, and a fluid groove 303 is disposed between two adjacent protrusions 342. The high-pressure water flows through the fluid tank 303, the fluid tank 303 has a large flow area, and the flow rate of the high-pressure water is low, which is beneficial to reducing pressure loss and internal energy consumption. Further, the outer side of the lower portion of the projection 342 is chamfered to further reduce the pressure loss of the high pressure water flowing through the retainer ring 34. The second annular chamber portion has an inner diameter φ 3 which is less than the inner diameter φ 8 of the inner bore of the retainer ring 34.
The bevel angle of the outer bevel of the abrasive tip 30 is equal to the bevel angle of the inner bevel of the positioning baffle ring 34, and is denoted as angle a; the bevel angle of the first conical cavity portion 23 is equal to the bevel angle of the outer bevel of the boss 342 of the retainer ring 34, denoted as angle B. The coaxial positioning of the abrasive nozzle 30 and the nozzle body 10 is favorably ensured by the positioning baffle ring 34, as shown in fig. 5-9, during assembly, the positioning baffle ring 34 can be directly arranged inside the annular cavity 20 of the nozzle body 10, the positioning baffle ring 34 and the annular cavity 20 realize automatic centering and coaxiality due to the inclined plane matching, then the second part 33 is arranged in the annular cavity 20, the second part 33 and the positioning baffle ring 34 automatically realize centering and coaxiality due to the inclined plane matching, and then are pressed by the abrasive nozzle pressure head 35, so that the coaxiality assembly of all parts is ensured. Preferably, angle A < angle B.
As shown in FIGS. 5 and 6, the outer wall of the boss 342 is fitted to the inner wall of the first cylindrical cavity portion 21 and the inner wall of the conical cavity portion, and the outer diameter of the top of the outer wall of the boss 342 is equal to the inner diameter of the first cylindrical cavity portion 21. In one embodiment, the discharge end 32 extends into the second cylindrical chamber section 22; further, the outer diameter of the discharge end portion 32 is smaller than the inner diameter of the second cylindrical cavity portion 22, and an annular gap is formed between the discharge end portion 32 and the inner wall of the second cylindrical cavity portion 22.
As shown in fig. 7-9, the abrasive tip 30 has an abrasive tip head 35 attached to the feed end of the second base 33, the abrasive tip head 35 being mounted to the nozzle body 10. The inner diameter φ 6 of the first cylindrical chamber portion 21 is larger than the outer diameter φ 5 of the second base portion 33. The upper end of the spray head body 10 is provided with internal threads for mounting an abrasive nozzle pressure head 35; the side of spray head body 10 is internally threaded for receiving fluid inlet fitting 40. A retainer ring 34 and an abrasive tip 30 are sequentially fitted in the nozzle body 10 and then pressed by an abrasive tip head 35. A sealing groove is provided at the position of the joint surface for mounting a sealing ring 70 to ensure the sealing effect of the injection device itself.
Preferably, abrasive tip head 35 is selectively threadably connected to spray head body 10. The outer circle of the pressure head 35 of the grinding tip is fitted into and coaxial with the first cylindrical chamber portion 21. A sealing ring 70 and a sealing groove are arranged between the outer cylindrical surface of the grinding nozzle pressure head 35 and the inner wall of the first cylindrical cavity part 21, so that high-pressure water is prevented from leaking. The pressure head 35 of the grinding nozzle is provided with an inner hole phi 5, and the bottom of the inner hole phi 5 presses the upper end face of the second main part 33; an inner hole phi 5 of the grinding nozzle pressure head 35 is matched and coaxial with the second main part 33, and high-pressure water is prevented from leaking through the sealing ring 70 and the sealing groove. The abrasive tip head 35 is provided with a first longitudinal channel and the second body portion 33 is provided with a second longitudinal channel in communication with the first longitudinal channel, the first longitudinal channel and the second longitudinal channel being configured as an abrasive channel 301, preferably the first longitudinal channel having a larger inner diameter than the second longitudinal channel.
The outer inclined plane angle of the positioning baffle ring 34 is equal to the inclined plane angle of the first conical cavity part 23, the positioning baffle ring 34 is arranged in the first cylindrical cavity part 21, the outer inclined plane of the grinding nozzle 30 presses the inner inclined plane of the positioning baffle ring 34 and is coaxial, the outer inclined plane of the positioning baffle ring 34 presses the inner inclined plane of the first conical cavity part 23 and is coaxial, so that the grinding nozzle 30 is positioned and pressed, the pre-tightening force on the grinding nozzle 30 is transmitted to the nozzle body 10, and the shape and position relation of the grinding nozzle 30 and the nozzle body 10 is not influenced by high-pressure water and vibration.
In one embodiment, the jetting apparatus includes a jet flow conduit 50, as shown in fig. 1, 5 and 6, the jet flow conduit 50 is mounted to the jetting outlet 11, as shown in fig. 13, the jet flow conduit 50 includes a second conical cavity portion 51 and a third cylindrical cavity portion 52, the second conical cavity portion 51 and the third cylindrical cavity portion 52 are sequentially distributed along the flow direction of the abrasive, and the second conical cavity portion 51, the third cylindrical cavity portion 52 and the abrasive duct 301 are coaxially arranged.
The high velocity jet water surrounds the abrasive and exits in the same direction and enters the jet conduit 50, where the high velocity jet and abrasive further mix and accelerate within the jet conduit 50. The inner diameter of the discharge end of the second conical cavity part 51 is smaller than that of the feed end thereof, so that the function of gradual polymerization jet flow is ensured, and the accelerating and mixing effects of the abrasive and the jet flow are optimized. The third cylindrical cavity section 52 has an inner diameter φ 1 equal to the inner diameter of the discharge end of the second conical cavity section 51. The bevel angle of the inner slope of the second conical cavity part 51 is denoted as angle D. Further, the angle D < 90 < 180 to improve the polymerization of the jet conduit 50 to enhance the mixing and acceleration of the high velocity jet with the abrasive.
The jet flow conduit 50 is installed to face the abrasive duct 301 of the abrasive nozzle 30, the nozzle body 10 is provided with an inner hole phi 9 having an inner step blocking the jet flow conduit 50, the conduit pressing screw 53 is screwed into the nozzle body 10 and presses the jet flow conduit 50, and the jet flow conduit 50 is locked by the conduit pressing screw 53.
According to the jet device, in the abrasive mixing and accelerating process, the abrasion of the jet flow guide pipe 50 is less, and the service life of the jet flow guide pipe 50 is prolonged. The second conical cavity part 51 converges and guides the jet flow when the jet flow conduit 50 is in the normal abrasion range; the front end of the third cylindrical cavity part 52 guides and accelerates the abrasive to be mixed outside the high-speed jet water; the rear section of the third cylindrical cavity part 52 can avoid the damage of the fully mixed abrasive jet flow, and the shape of the jet flow conduit 50 is optimized to adapt to the action section of the abrasive jet flow core section, so that the use state of the mixed jet flow is improved.
The first cylindrical cavity part 21, the second cylindrical cavity part 22 and the threaded hole of the spray head body 10, the abrasive duct 301, the discharge end part 32, the first body, the groove bottom surface and the threaded column of the jet flow groove 302 of the abrasive nozzle 30, the third cylindrical cavity part 52 and the second conical cavity part 51 of the jet flow guide pipe 50 and the abrasive nozzle pressure head 35 are concentric and coaxial. The abrasive tip 30 may be of a material that is easily machined or 3D printed. The abrasive tip 30 may be made of tungsten carbide, synthetic diamond or silicon carbide, and the jet conduit 50 may be made of hard and brittle high-wear-resistant material such as tungsten carbide or synthetic diamond.
As shown in fig. 1 and 5, the jetting apparatus includes a high pressure water generator 61, an abrasive supply tank 62, and a filtering mechanism 64, the high pressure water generator 61 being connected to the fluid input joint 40, and the abrasive supply tank 62 and the filtering mechanism 64 being connected to the abrasive tip 30. Particles outside the nozzle body 10 can be sucked under the action of low pressure or negative pressure in the abrasive nozzle 30, the filtering mechanism 64 has a filtering effect on the sucked shell, so that the spraying device can recycle the abrasives, and waste rock slag generated in the rock cutting and breaking process can be used as an abrasive source through the filtering mechanism 64 to replace the abrasive supply tank 62 to supply the abrasives. Specifically, the filter mechanism 64 includes a filter cover plate.
The above description is only a few embodiments of the present invention, and those skilled in the art can make various modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention according to the disclosure of the application document.
Claims (10)
1. A post-jet abrasive blasting apparatus comprising:
a spray head body provided with a spray outlet;
the abrasive nozzle is arranged on the spray head body, a ring cavity surrounding the abrasive nozzle is arranged in the spray head body, and the spray outlet is communicated with the ring cavity;
the fluid input joint is arranged on the spray head body and communicated with the annular cavity;
the grinding nozzle is provided with a grinding material pore passage which is communicated with the annular cavity.
2. The post-jet abrasive mixing blasting apparatus of claim 1 wherein said abrasive passage is disposed coaxially with said blast outlet, and said annular chamber is annular coaxial with said abrasive passage.
3. The post-jet abrasive mixing device as claimed in claim 2, wherein the fluid input connector is disposed on a side of the annular chamber, and a fluid input direction of the fluid input connector is perpendicular to an axial direction of the annular chamber.
4. The post-jet abrasive blasting apparatus of claim 1, wherein the outer sidewall of the discharge end of the abrasive tip is provided with a jet groove.
5. The jet post-mix abrasive blasting apparatus of claim 4, wherein the abrasive nozzle has a first base portion and a discharge end portion sequentially arranged in a flow direction of the abrasive, the discharge end portion having an outer diameter smaller than that of the first base portion, and the jet groove extends from the first base portion to the discharge end portion.
6. The jet device for post-jet mixing of abrasives according to claim 1, wherein the abrasive nozzle has a second base and a positioning baffle ring, the positioning baffle ring comprises an annular body and a plurality of protrusions connected to a sidewall of the annular body, the annular body is connected to a discharge end of the second base, the plurality of protrusions are distributed around the circumference of the annular body at intervals, and a fluid groove is formed between two adjacent protrusions.
7. The jet device for post-jet mixing of abrasives according to claim 6, wherein the annular chamber comprises a first cylindrical chamber part, a first conical chamber part and a second cylindrical chamber part which are sequentially distributed along the flow direction of the abrasives, and the inner diameter of the second cylindrical chamber part is smaller than that of the first cylindrical chamber part; the outer wall of the bulge part is attached to the inner wall of the first cylindrical cavity part and the inner wall of the conical cavity part.
8. The post-jet abrasive mixing blasting apparatus of claim 6, wherein said abrasive tip has an abrasive tip head attached to said second base at said feed end, said abrasive tip head being mounted to said body.
9. The jet device for post-jet mixing of abrasives according to claim 1, comprising a jet conduit, wherein the jet conduit is mounted at the jet outlet, the jet conduit comprises a second conical cavity part and a third cylindrical cavity part, the second conical cavity part and the third cylindrical cavity part are sequentially distributed along the flow direction of the abrasives, and the second conical cavity part and the third cylindrical cavity part are coaxially arranged with the abrasive duct.
10. The post-jet abrasive mixing blasting apparatus of claim 1, wherein said blasting apparatus comprises a high pressure water generator, an abrasive feed tank, and a filter mechanism, said high pressure water generator being connected to said fluid input fitting, said abrasive feed tank and said filter mechanism being connected to said abrasive tip.
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| CN202111323555.6A CN113997204B (en) | 2021-11-09 | 2021-11-09 | Jet device for jet flow back mixing abrasive |
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| CN202111323555.6A CN113997204B (en) | 2021-11-09 | 2021-11-09 | Jet device for jet flow back mixing abrasive |
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| CN113997204B CN113997204B (en) | 2022-10-18 |
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|---|---|
| CN113997204B (en) | 2022-10-18 |
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