An abrasive water jet ship repair and rust removal equipment

Abstract

The present invention relates to an abrasive water jet ship repair and rust removal device, which includes a rust removal housing, a nozzle assembly capable of rotating within the rust removal housing, and a plurality of spray head assemblies. The rust removal housing includes an upper housing and a lower housing. The nozzle assembly includes an inner pipe, a middle pipe, and an outer pipe. The spray head assembly includes a first high-pressure water pipe, a second high-pressure water pipe, an abrasive pipe, and a nozzle. A first high-pressure water cavity is provided inside the inner pipe, inside the first high-pressure water pipe, and between the second high-pressure water pipe and the nozzle. A second high-pressure water cavity is provided between the upper housing and the middle pipe, between the middle pipe and the inner pipe, and inside the second high-pressure water pipe. An abrasive cavity is provided between the lower housing and the outer pipe, between the outer pipe and the middle pipe, and inside the abrasive pipe. The rotating spray head assembly cooperates with the spray holes to effectively improve the rust removal area and efficiency. The abrasive adsorbed by negative pressure is mixed with the high-pressure water jet for the first time and then mixed with the high-pressure water again through a mixer, improving the mixing efficiency and the kinetic energy of the material, ensuring the continuity, uniformity, and stability of erosion, and achieving an efficient and high-quality surface treatment effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of spraying devices, and particularly relates to an abrasive water jet ship repair and rust removal device. Background Art

[0002] Rust removal is a key process in the ship and offshore equipment repair and construction projects. Surface rust removal construction, including scale removal, marine organism removal, paint removal, etc., is the pretreatment process of painting construction and has an important impact on the coating quality. And the quality of the painted film directly affects the maintenance and service life of ship equipment. The traditional methods of using chipping hammers and dry sandblasting for rust removal not only have poor efficiency but also have waste pollution and construction risks, and it is difficult to meet the requirements of green ship repair surface treatment.

[0003] The abrasive water jet ship repair and rust removal device is a spraying device that mixes abrasives such as quartz sand into high-speed and high-pressure water, so that the grit impacts the oxides on the metal surface and achieves the rust removal effect through physical crushing and grinding. It can inhibit temperature rise and dust and can be recycled, which is green and environmentally friendly. However, there are still the following problems: (1) The rust removal width of a single nozzle is relatively narrow, which restricts the rust removal efficiency; (2) After the high-pressure water jet is formed, the high-pressure water jet forms a negative pressure through the directly connected mixing chamber and sucks in the abrasive. The mixing efficiency of solid abrasive particles and water is relatively low and it is difficult to enter the core part of the water jet, reducing the erosion continuity, uniformity and stability; (3) The kinetic energy after the mixing of abrasive particles and water flow is relatively low, reducing the abrasive effect and erosion effect; thus, it is difficult to achieve high-efficiency and high-quality surface treatment effects. Summary of the Invention

[0004] The present invention aims to solve at least one of the above technical problems to some extent. The present invention provides an abrasive water jet ship repair and rust removal device to improve the efficiency and quality of green ship repair surface treatment.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] An abrasive water jet ship repair and rust removal device includes a rust removal housing, a nozzle assembly that can rotate within the rust removal housing, and a plurality of nozzle components. The rust removal housing includes an upper housing and a lower housing connected together. The nozzle assembly includes an inner tube, a middle tube, and an outer tube nested and connected in sequence from the inside out. The nozzle component includes a first high-pressure water pipe, a second high-pressure water pipe, an abrasive pipe, and a nozzle;

[0007] A first high-pressure water cavity that is connected is provided inside the inner tube, inside the first high-pressure water pipe, and between the second high-pressure water pipe and the nozzle. A second high-pressure water cavity that is connected is provided between the upper housing and the middle tube, between the middle tube and the inner tube, and inside the second high-pressure water pipe. An abrasive cavity that is connected is provided between the lower housing and the outer tube, between the outer tube and the middle tube, and inside the abrasive pipe. Mixing chambers are respectively provided between the second high-pressure water pipe and the abrasive pipe, and between the second high-pressure water pipe and the nozzle.

[0008] Further, a speed-regulating motor is provided outside the rust-removing housing. The inner pipe extends outside the upper housing. Both the inner pipe and the speed-regulating motor are connected with belt pulleys, and a synchronous belt is arranged outside the belt pulleys.

[0009] Further, the inner pipe is rotatably connected with a first high-pressure water joint.

[0010] Further, a second high-pressure water joint is provided on the upper housing, a first annular groove is arranged inside the upper housing, and a number of first through holes communicating with the second high-pressure water joint, the first annular groove and the second high-pressure water cavity are arranged on the middle pipe.

[0011] Further, a first boss for limiting and cooperating with the middle pipe is arranged inside the upper housing. A number of first packing rings located outside the middle pipe are arranged at the top of the upper housing. A top cover connected to the upper housing and sleeved outside the middle pipe is arranged on the top of the number of first packing rings.

[0012] Further, a first groove for limiting and cooperating with the middle pipe and the outer pipe is arranged inside the upper housing. A number of bearings located at the top of the lower housing are arranged between the bottom of the upper housing and the outer pipe. The top of the lower housing is connected to the upper housing, and a second boss for limiting and cooperating with the outer pipe is arranged on the lower housing.

[0013] Further, an abrasive joint is provided on the lower housing, a second annular groove is arranged inside the lower housing, and a number of second through holes communicating with the abrasive joint, the second annular groove and the abrasive cavity are arranged on the outer pipe.

[0014] Further, a number of second packing rings located outside the outer pipe are arranged at the bottom of the lower housing. A bottom cover connected to the lower housing and located outside the outer pipe is arranged on the bottom of the number of second packing rings.

[0015] Further, the top of the middle pipe is in limiting cooperation with the inner pipe. A seal cover in limiting cooperation with the outer pipe and connected to the inner pipe is arranged at the bottom of the nozzle assembly. Sealing members are arranged between the seal cover and the inner pipe, between the seal cover and the middle pipe, and between the seal pipe and the outer pipe. The abrasive pipes of a number of nozzle assemblies are connected to the outside of the outer pipe, and the first high-pressure water pipes and the second high-pressure water pipes of a number of nozzle assemblies are respectively connected to the seal cover.

[0016] Further, the second high-pressure water pipe includes a first pipe body, a second pipe body and a third pipe body connected in sequence. A first reduced opening placed inside the second pipe body is arranged at the tail of the first pipe body. The end of the abrasive pipe corresponds to the outside of the first reduced opening, and the abrasive pipe is obliquely communicated with the second pipe body. A throat hole is arranged inside the second pipe body, and a mixing cavity is formed between the front end of the throat hole, the first reduced opening and the abrasive pipe.

[0017] Further, the third pipe body is in an L shape and is connected to the nozzle.

[0018] Further, the nozzle is sleeved outside the tail end of the second high-pressure water pipe. A mixer with a limiting fit is provided between the inside of the nozzle and the tail end of the second high-pressure water pipe. The mixer is provided with a second constriction and a number of third through holes inclined to the second constriction. The front end of the third through hole communicates with the first high-pressure water cavity, and a mixing cavity is formed between the rear end of the third through hole, the rear end of the second constriction and the nozzle.

[0019] Further, the bottom of the nozzle is arc-shaped and is provided with a number of spray holes that are inclined to each other.

[0020] Further, the rust removal housing includes an outer cover located outside the spray head assembly, and the outer cover is provided with an adsorption port.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) By using a spray pipe assembly and a spray head assembly that rotate relative to the rust removal housing, and the rotating spray head assembly cooperates with a number of spray holes on the bottom of the nozzle that are inclined to each other to increase the jet area, effectively improving the rust removal area and efficiency.

[0023] (2) When a part of the high-pressure water is accelerated and ejected through the second high-pressure water cavity communicated between the upper housing and the middle pipe, between the middle pipe and the inner pipe, and inside the second high-pressure water pipe, the abrasive in the abrasive cavity between the lower housing and the outer pipe, between the outer pipe and the middle pipe, and inside the abrasive pipe is adsorbed by negative pressure, and a primary mixing is carried out in the mixing cavity between the second high-pressure water pipe and the abrasive pipe;

[0024] Another part of the high-pressure water passes through the first high-pressure water cavity communicated inside the inner pipe, inside the first high-pressure water pipe, and between the second high-pressure water pipe and the nozzle, and a secondary mixing is carried out under the action of the mixer in the mixing cavity between the second high-pressure water pipe and the nozzle, significantly improving the mixing efficiency and ensuring the continuity, uniformity and stability of erosion.

[0025] (3) The high-pressure water jet increases the speed and forms a negative pressure adsorption effect through the first constriction, so that the primary mixture of high-pressure water and abrasive is accelerated and ejected through the throat hole. The jet of the primary mixture of abrasive and high-pressure water is accelerated through the second constriction, and the kinetic energy of the material after mixing is significantly increased by the collision of the jet of the primary mixture and the inclined high-pressure water jet, so as to give full play to the role of the abrasive and improve the erosion effect.

[0026] In summary, by using the abrasive water jet ship repair and rust removal equipment of the present invention, the structure is compact, the disassembly and assembly are convenient, the high-speed mixture of abrasive and high-pressure water after secondary mixing is ejected from a number of spray holes at the bottom of the nozzle for eroding the hull surface for rust removal operations, and the adsorption port recovers the rust removal waste for recycling after treatment, achieving a high-efficiency and high-quality surface treatment effect and meeting the surface treatment requirements of green ship repair. Description of the Drawings

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a top perspective view of an embodiment of the present invention;

[0029] Figure 2 is a bottom perspective view of an embodiment of the present invention;

[0030] Figure 3 is a bottom view of an embodiment of the present invention;

[0031] Figure 4 is Figure 3 a sectional view taken along the AA direction;

[0032] Figure 5 is Figure 4 an enlarged view of the structure of part B;

[0033] Figure 6 is Figure 4 an enlarged view of the structure of part C;

[0034] Figure 7 is Figure 4 an enlarged view of the structure of part D;

[0035] Figure 8 is a perspective view of a nozzle assembly and a spray head assembly of an embodiment of the present invention.

[0036] In the figure: rust removal housing 1, upper housing 11, second high-pressure water joint 111, first annular groove 112, first boss 113, first groove 114, oil plug 115, lower housing 12, second boss 121, abrasive joint 122, second annular groove 123, outer cover 124, adsorption port 1241, first packing 13, upper cover 14, second packing 15, lower cover 16, bearing 17, washer 18;

[0037] nozzle assembly 2, inner pipe 21, first high-pressure water joint 211, middle pipe 22, first through hole 221, flange 222, outer pipe 23, second through hole 231, seal cover 24, seal 25;

[0038] spray head assembly 3, first high-pressure water pipe 31, second high-pressure water pipe 32, first pipe body 321, first constriction 3211, second pipe body 322, throat hole 3221, third pipe body 323, flange 3231, abrasive pipe 33, nozzle 34, spray hole 341, mixer 35, second constriction 351, third through hole 352, second groove 353;

[0039] The first high-pressure water cavity 4, the second high-pressure water cavity 5, the abrasive cavity 6, the mixing cavity 7, the speed-regulating motor 8, the pulley 801, the synchronous belt 802, the nut 803, and the bracket 9. Detailed implementation manners

[0040] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" and "several" is two or more unless otherwise specifically defined.

[0042] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] As Figures 1-8 shown, it is a preferred embodiment of the abrasive water jet ship repair and rust removal equipment of the present invention. The abrasive water jet ship repair and rust removal equipment includes a rust removal housing 1, a nozzle assembly 2 that can rotate inside the rust removal housing 1, and several spray head assemblies 3. The rust removal housing 1 includes an upper housing 11 and a lower housing 12 connected to each other. The nozzle assembly 2 includes an inner pipe 21, a middle pipe 22, and an outer pipe 23 nested and connected in sequence from the inside to the outside. The spray head assembly 3 includes a first high-pressure water pipe 31, a second high-pressure water pipe 32, an abrasive pipe 33, and a nozzle 34;

[0044] A first high-pressure water cavity 4 is provided and communicated between the inner pipe 21, inside the first high-pressure water pipe 31, between the second high-pressure water pipe 32 and the nozzle 34. A second high-pressure water cavity 5 is provided and communicated between the upper housing 11 and the middle pipe 22, between the middle pipe 22 and the inner pipe 21, and inside the second high-pressure water pipe 32. An abrasive cavity 6 is provided and communicated between the lower housing 12 and the outer pipe 23, between the outer pipe 23 and the middle pipe 22, and inside the abrasive pipe 33. Mixing cavities 7 are respectively provided between the second high-pressure water pipe 32 and the abrasive pipe 33, and between the second high-pressure water pipe 32 and the nozzle 34.

[0045] Further, a speed-regulating motor 8 is provided outside the rust-removing housing 1. The inner pipe 21 extends outside the upper housing 11. Both the inner pipe 21 and the speed-regulating motor 8 are connected with belt pulleys 801, and a synchronous belt 802 is provided outside the belt pulleys 801.

[0046] Preferably, the speed-regulating motor 8 is installed on the lower housing 12. The belt pulley 801 is connected to the motor shaft of the inner pipe 21 or the speed-regulating motor 8 through keyway fit. Nuts 803 are provided on the motor shafts of the inner pipe 21 and the speed-regulating motor 8 outside the belt pulley 801. By configuring the size of the belt pulley 801 and the rotation speed of the speed-regulating motor 8, the spray pipe assembly 2 is driven to rotate inside the rust-removing housing 1 by the transmission of the belt pulley 801 and the synchronous belt 802, and the rust-removing uniformity and amplitude are increased by the full-circle rotation of the nozzle 34 assembly along with the spray pipe assembly 2.

[0047] Further, a first high-pressure water joint 211 is coaxially and rotatably connected to the top of the inner pipe 21, so as to supply water to the first high-pressure water cavity 4 inside the rotating inner pipe 21 through the connection of the first high-pressure water joint 211 to a pipeline.

[0048] Further, a second high-pressure water joint 111 is provided on the upper housing 11. A first annular groove 112 is provided inside the upper housing 11. A second annular groove 123 forms the second high-pressure water cavity 5 between the upper housing 11 and the middle pipe 22. A plurality of first through holes 221 communicating with the second high-pressure water joint 111, the first annular groove 112 and the second high-pressure water cavity 5 are provided on the middle pipe 22. Water is supplied to the second high-pressure water cavity 5 between the inside of the middle pipe 22 and the outside of the inner pipe 21 through the connection of the second high-pressure water joint 111 to a pipeline and through the first annular groove 112 and a plurality of through holes.

[0049] Further, a first boss 113 that is in limiting cooperation with the middle pipe 22 is provided inside the upper housing 11. A plurality of first packing rings 13 located outside the middle pipe 22 are provided at the top of the upper housing 11. A top cover 14 that is connected to the upper housing 11 and sleeved outside the middle pipe 22 is provided on the top of the plurality of first packing rings 13. The top cover 14 is sleeved downward from the top of the nozzle assembly 2 outside the nozzle assembly 2. With the first boss 113 in limiting cooperation with the middle pipe 22, a plurality of first packing rings 13 and the top cover 14 are sleeved on the outside of the middle pipe 22. The connection between the top cover 14 and the upper housing 11 realizes the installation of the plurality of first packing rings 13, improving the sealing performance between the upper housing 11 and the middle pipe 22 and preventing high-pressure water leakage.

[0050] Further, a first groove 114 that is in limiting cooperation with the middle pipe 22 and the outer pipe 23 is provided inside the upper housing 11. A plurality of bearings 17 located at the top of the lower housing 12 are provided between the bottom of the upper housing 11 and the outer pipe 23. The top of the lower housing 12 is connected to the upper housing 11. A second boss 121 that is in limiting cooperation with the outer pipe 23 is provided on the lower housing 12.

[0051] Preferably, the middle pipe 22 and the outer pipe 23 are hermetically connected by a flange 222. The flange 222 is in limiting cooperation with the first groove 114. The plurality of bearings 17 are sleeved upward from the bottom of the outer pipe 23 outside the outer pipe 23. A washer 18 is provided between adjacent bearings 17. An oil injection hole and an oil plug 115 corresponding to the upper housing 11 are provided for applying lubricating oil, so that when the nozzle assembly 2 rotates in the rust removal housing 1, it is stably supported by the bearings 17.

[0052] Further, an abrasive joint 122 is provided on the lower housing 12. A second annular groove 123 is provided inside the lower housing 12. The second annular groove 123 forms an abrasive cavity 6 between the lower housing 12 and the outer pipe 23. A plurality of second through holes 231 communicating with the abrasive joint 122, the second annular groove 123, and the abrasive cavity 6 are provided on the outer pipe 23. A pipeline is connected by the abrasive joint 122, and abrasive is supplied to the abrasive cavity 6 between the inside of the outer pipe 23 and the outside of the middle pipe 22 through the second annular groove 123 via the plurality of second through holes 231.

[0053] Further, a plurality of second packing rings 15 located outside the outer pipe 23 are provided at the bottom of the lower housing 12. A bottom cover 16 that is connected to the lower housing 12 and located outside the outer pipe 23 is provided at the bottom of the plurality of second packing rings 15. The plurality of second packing rings 15 and the bottom cover 16 are sleeved upward from the bottom of the outer pipe 23 between the outer pipe 23 and the lower housing 12. The connection between the bottom cover 16 and the bottom of the lower housing 12 realizes the installation of the plurality of second packing rings, improving the sealing performance between the lower housing 12 and the outer pipe 23 and preventing abrasive leakage.

[0054] Further, the top of the middle tube 22 is in limit fit with the inner tube 21. A cover 24 which is in limit fit with the outer tube 23 and connected to the inner tube 21 is provided at the bottom of the nozzle assembly 2. Sealing members 25 are provided between the cover 24 and the inner tube 21, between the cover 24 and the middle tube 22, and between the sealing tube and the outer tube 23. The abrasive pipes 33 of several nozzle assemblies 3 are connected to the outside of the outer tube 23. The first high-pressure water pipes 31 and the second high-pressure water pipes 32 of several nozzle assemblies 3 are respectively connected to the cover 24. After the cover 24 is installed, the top of the inner tube 21 is in limit fit with the middle tube 22, and the bottom of the inner tube 21 is connected and positioned with the cover 24. The sealing performance of the installation of the cover 24 is improved by the sealing member 25, ensuring the stability of the nozzle assembly 2.

[0055] Further, the second high-pressure water pipe 32 includes a first pipe body 321, a second pipe body 322, and a third pipe body 323 connected in sequence. A first constriction 3211 is provided at the tail of the first pipe body 321 and placed inside the second pipe body 322. The end of the abrasive pipe 33 corresponds to the outside of the first constriction 3211, and the abrasive pipe 33 is obliquely connected to the second pipe body 322. A throat hole 3221 is provided in the second pipe body 322. A mixing chamber 7 is formed between the front end of the throat hole 3221, the first constriction 3211, and the abrasive pipe 33.

[0056] Further, the third pipe body 323 is in an L shape and connected to the nozzle 34, making the manufacturing and assembly reliable and facilitating the spraying of the mixed fluid of abrasive and water downward for ship repair and rust removal.

[0057] Further, the nozzle 34 is sleeved outside the tail end of the second high-pressure water pipe 32. A mixer 35 with a limit fit is provided between the inside of the nozzle 34 and the tail end of the second high-pressure water pipe 32. The mixer 35 is provided with a second constriction 351 and several third through holes 352 inclined to the second constriction 351. The front end of the third through hole 352 is connected to the first high-pressure water cavity 4, and a mixing chamber 7 is formed between the rear end of the third through hole 352, the rear end of the second constriction 351, and the nozzle 34.

[0058] Preferably, the bottom of the mixer 35 is in a flared structure, and several third through holes 352 are arranged on the shoulder of the mixer 35, so that the third through holes 352 connect the first high-pressure water cavity 4 between the outside of the third pipe body 323 and the inside of the nozzle 34, strengthening the mixing effect.

[0059] Preferably, a flange 3231 and a second groove 353 are provided on one of the third pipe body 323, the mixer 35, and the nozzle 34. The limit positioning installation of the mixer 35 is realized through the cooperation of the flange 3231 and the second groove 353.

[0060] Further, the bottom of the nozzle 34 is in an arc shape and provided with several spray holes 341 arranged obliquely to each other, for reducing kinetic energy dissipation and increasing the radiation area.

[0061] Further, the rust removal housing 1 includes an outer cover 124 located outside the nozzle assembly 3. An adsorption port 1241 is provided on the outer cover 124. The adsorption port 1241 is used to connect to a vacuum system for recycling rust removal waste, so as to be recycled after treatment and improve environmental friendliness.

[0062] Further, a bracket 9 is provided on the rust removal housing 1 for connecting a lifting long arm or a wall-climbing machine, etc. to realize the movement drive of the equipment.

[0063] The working principle of the above abrasive water jet ship repair rust removal equipment is as follows:

[0064] The nozzle assembly 2 is hermetically assembled and rotatable relative to the rust removal housing 1 in the upper housing 11 and the lower housing 12 through an outer tube 23, a middle tube 22 and an inner tube 21 nested from the inside out in sequence. A number of nozzle assemblies 3 composed of a first high-pressure water pipe 31, a second high-pressure water pipe 32, an abrasive pipe 33 and a nozzle 34 are connected and assembled on the nozzle assembly 2. The first high-pressure water joint 211 and the second high-pressure water joint 111 are respectively connected to a high-pressure water pipeline for water supply, and the abrasive joint 122 is connected to an abrasive pneumatic conveying pipeline for supplying abrasives. The nozzle assembly 2 and a number of nozzle assemblies 3 are driven to rotate relative to the rust removal housing 1 by a speed-regulating motor 8 through a pulley 801 and a synchronous belt 802.

[0065] The high-pressure water for primary mixing enters the first annular groove 112 inside the upper housing 11 through the second high-pressure water joint 111 of the upper housing 11, enters the second high-pressure water cavity 5 between the inside of the middle tube 22 and the outside of the inner tube 21 through a number of first through holes 221 of the middle tube 22, and then the high-pressure water flows into the first tube body 321 of the second high-pressure water pipe 32 of a number of nozzle assemblies 3 through the cover 24, forming a high-pressure jet that accelerates and sprays out towards the first constriction 3211, and generates negative pressure adsorption inside the second tube body 322 at the tail end of the first tube body 321.

[0066] The abrasives enter the second annular groove 123 inside the lower housing 12 through the abrasive joint 122 of the lower housing 12, enter the abrasive cavity 6 between the inside of the outer tube 23 and the outside of the middle tube 22 through a number of second through holes 231 of the outer tube 23, and then the abrasives enter the abrasive pipes 33 of a number of nozzle assemblies 3 through the bottom of the outer tube 23. The abrasives are sucked into the front end of the throat hole 3221 under the action of negative pressure adsorption, and enter the mixing cavity 7 formed between the first constriction 3211 and the abrasive pipe 33 for primary mixing of the abrasives and the high-pressure water. The initial mixture of abrasives and water accelerates towards the L-shaped third pipeline through the throat hole 3221 of the second tube body 322 and is accelerated and sprayed out through the second constriction 351 of the mixer 35.

[0067] The high-pressure water for secondary mixing enters the first high-pressure water cavity 4 inside the inner pipe 21 through the first high-pressure water joint 211. Subsequently, the high-pressure water flows into the first high-pressure water pipe 31 of several spray head assemblies 3 through the cover 24 and enters the first high-pressure water cavity 4 between the outside of the third pipe body 323 and the nozzle 34. The high-pressure water enters the space between the mixer 35 and the nozzle 34 through several third through holes 352 inclined with respect to the second constriction 351 of the mixer 35. A mixing cavity 7 is formed between the rear end of the third through hole 352, the rear end of the second constriction 351, and the nozzle 34. The primary mixture jet of abrasive and high-pressure water collides with the high-pressure water jet for secondary mixing. After secondary mixing, the mixture of abrasive and high-pressure water is ejected from several spray holes 341 at the bottom of the nozzle 34 for eroding the hull surface to perform rust removal operations.

[0068] During rust removal, the bracket 9 is connected to equipment such as a lifting long arm or a wall-climbing machine to transfer the working area. At the same time, the vacuum system adsorbs and recovers the rust removal waste through the adsorption port 1241 for recycling after treatment.

[0069] In summary, the present invention uses a nozzle assembly 2 and a spray head assembly 3 that rotate relative to the rust removal housing 1. When the nozzle assembly 2 rotates inside the rust removal housing 1, it is stably supported by the bearing 17. The rotating spray head assembly 3 cooperates with several spray holes 341 arranged obliquely to each other at the bottom of the nozzle 34 to increase the jet area, solving the problem that the rust removal area of a single spray head is relatively narrow, which restricts the rust removal efficiency.

[0070] The nozzle assembly 2 of the present invention includes an inner pipe 21, a middle pipe 22, and an outer pipe 23 nested and connected in sequence from the inside out. After sealed assembly with the limit, the first packing 13, and the second packing 15, when a part of the high-pressure water accelerates and ejects through the second high-pressure water cavity 5 communicated between the upper housing 11 and the middle pipe 22, between the middle pipe 22 and the inner pipe 21, and inside the second high-pressure water pipe 32, the abrasive in the abrasive cavity 6 between the lower housing 12 and the outer pipe 23, between the outer pipe 23 and the middle pipe 22, and inside the abrasive pipe 33 is negatively adsorbed. The primary mixing is carried out in the mixing cavity 7 between the second high-pressure water pipe 32 and the abrasive pipe 33. Another part of the high-pressure water passes through the first high-pressure water cavity 4 communicated inside the inner pipe 21, inside the first high-pressure water pipe 31, and between the second high-pressure water pipe 32 and the nozzle 34, and is subjected to secondary mixing through the action of the mixer 35 in the mixing cavity 7 between the second high-pressure water pipe 32 and the nozzle 34, significantly improving the mixing efficiency. The overall structure is compact, and the problem that solid abrasive particles are difficult to enter the core part of the water jet, reducing the erosion continuity, uniformity, and stability, is solved.

[0071] The high-pressure water jet of the present invention increases the speed and forms a negative pressure adsorption effect through the first constriction 3211, so that the primary mixture of high-pressure water and abrasive is accelerated and ejected through the throat hole 3221. The jet of the primary mixture of abrasive and high-pressure water is accelerated by the second constriction 351. The kinetic energy of the material after mixing is significantly increased by the collision of the jet of the primary mixture with the inclined high-pressure water jet, so as to give full play to the role of the abrasive and solve the problems that the kinetic energy of the abrasive particles is low after mixing with the water flow, reducing the abrasive effect and the erosion effect. Thus, the above achieves an efficient and high-quality surface treatment effect overall.

[0072] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An abrasive water jet ship repair and rust removal device, characterized in that, it includes a rust removal housing (1), a nozzle assembly (2) that can rotate inside the rust removal housing (1), and several nozzle head assemblies (3). The rust removal housing (1) includes an upper housing (11) and a lower housing (12) connected to each other. The nozzle assembly (2) includes an inner tube (21), a middle tube (22), and an outer tube (23) nested and connected in sequence from inside to outside. The nozzle head assembly (3) includes a first high-pressure water pipe (31), a second high-pressure water pipe (32), an abrasive pipe (33), and a nozzle (34); A first high-pressure water cavity (4) is provided and communicated inside the inner tube (21), inside the first high-pressure water pipe (31), and between the second high-pressure water pipe (32) and the nozzle (34). A second high-pressure water cavity (5) is provided and communicated between the upper housing (11) and the middle tube (22), between the middle tube (22) and the inner tube (21), and inside the second high-pressure water pipe (32). An abrasive cavity (6) is provided and communicated between the lower housing (12) and the outer tube (23), between the outer tube (23) and the middle tube (22), and inside the abrasive pipe (33). Mixing cavities (7) are respectively provided between the second high-pressure water pipe (32) and the abrasive pipe (33), and between the second high-pressure water pipe (32) and the nozzle (34).

2. The abrasive water jet ship repair and rust removal device according to claim 1, characterized in that, a speed-regulating motor (8) is provided outside the rust removal housing (1). The inner tube (21) extends outside the upper housing (11). A first high-pressure water joint (211) is rotatably connected to the inner tube (21). Both the inner tube (21) and the speed-regulating motor (8) are connected with belt pulleys (801), and a synchronous belt (802) is provided outside the belt pulleys (801).

3. The abrasive water jet ship repair and rust removal device according to claim 1, characterized in that, a second high-pressure water joint (111) is provided on the upper housing (11), and a first annular groove (112) is provided inside the upper housing (11). A number of first through holes (221) are provided on the middle tube (22) and are communicated with the second high-pressure water joint (111), the first annular groove (112), and the second high-pressure water cavity (5); a first boss (113) for limiting and cooperating with the middle tube (22) is provided inside the upper housing (11). A number of first packing rings (13) located outside the middle tube (22) are provided at the top of the upper housing (11). A top cover (14) connected to the upper housing (11) and sleeved outside the middle tube (22) is provided on the top of the number of first packing rings (13).

4. The abrasive water jet ship repair and rust removal device according to claim 1, characterized in that, a first groove (114) for limiting and cooperating with the middle tube (22) and the outer tube (23) is provided inside the upper housing (11). A number of bearings (17) are provided between the bottom of the upper housing (11) and the outer tube (23) and are located at the top of the lower housing (12). The top of the lower housing (12) is connected to the upper housing (11), and a second boss (121) for limiting and cooperating with the outer tube (23) is provided on the lower housing (12).

5. The abrasive water jet ship repair and rust removal equipment according to claim 1, characterized in that, an abrasive joint (122) is provided on the lower housing (12), a second annular groove (123) is provided inside the lower housing (12), and a plurality of second through holes (231) communicating with the abrasive joint (122), the second annular groove (123) and the abrasive cavity (6) are provided on the outer pipe (23); a plurality of second packing glands (15) located outside the outer pipe (23) are provided at the bottom of the lower housing (12), and a lower cover (16) connected to the lower housing (12) and located outside the outer pipe (23) is provided at the bottom of the plurality of second packing glands (15).

6. The abrasive water jet ship repair and rust removal equipment according to claim 1, characterized in that, the top of the middle pipe (22) is in limit fit with the inner pipe (21), a sealing cover (24) in limit fit with the outer pipe (23) and connected to the inner pipe (21) is provided at the bottom of the nozzle assembly (2), and sealing members (25) are provided between the sealing cover (24) and the inner pipe (21), between the sealing cover (24) and the middle pipe (22), and between the sealing pipe and the outer pipe (23). The abrasive pipes (33) of a plurality of nozzle assemblies (3) are connected to the outside of the outer pipe (23), and the first high-pressure water pipes (31) and the second high-pressure water pipes (32) of a plurality of nozzle assemblies (3) are respectively connected to the sealing cover (24).

7. The abrasive water jet ship repair and rust removal equipment according to claim 1, characterized in that, the second high-pressure water pipe (32) includes a first pipe body (321), a second pipe body (322) and a third pipe body (323) connected in sequence. A first necking (3211) placed inside the second pipe body (322) is provided at the tail of the first pipe body (321). The end of the abrasive pipe (33) corresponds to the outside of the first necking (3211), and the abrasive pipe (33) is obliquely communicated with the second pipe body (322). A throat hole (3221) is provided inside the second pipe body (322). A mixing cavity (7) is formed between the front end of the throat hole (3221) and the first necking (3211) and the abrasive pipe (33). The third pipe body (323) is in an L shape and is connected to the nozzle (34).

8. The abrasive water jet ship repair and rust removal equipment according to claim 1, characterized in that, the nozzle (34) is sleeved outside the tail end of the second high-pressure water pipe (32). A mixer (35) in limit fit with the tail end of the second high-pressure water pipe (32) is provided inside the nozzle (34). A second necking (351) and a plurality of third through holes (352) inclined to the second necking (351) are provided on the mixer (35). The front end of the third through hole (352) is communicated with the first high-pressure water cavity (4), and a mixing cavity (7) is formed between the rear end of the third through hole (352), the rear end of the second necking (351) and the nozzle (34).

9. The abrasive water jet ship repair and rust removal equipment according to claim 1, characterized in that, the bottom of the nozzle (34) is arc-shaped and is provided with a plurality of spray holes (341) arranged obliquely to each other.

10. The abrasive water jet ship repair and rust removal equipment according to any one of claims 1 to 9, It is characterized in that the rust removal housing (1) includes an outer cover (124) located outside the spray head assembly (3), and an adsorption port (1241) is provided on the outer cover (124).

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