Spray head of sand blasting device capable of adjusting flow velocity

Abstract

The utility model aims to provide the spray head of the sand blasting device capable of adjusting the flow velocity, which can adaptively change and adjust the opening size of the spray head while adjusting the sand blasting particles discharged from the spray head, so that the flow velocity of the sand blasting device can be adjusted while the state of compressed air serving as a power source is not changed. And the flow jetting state of the sand blasting particles discharged outwards by the nozzle is accurately controlled and adjusted. The spray head comprises a spray head body, the front end of the spray head body extends forwards to form a nozzle part, a sand blasting channel allowing sand blasting particles to be sprayed and discharged outwards is formed in the nozzle part, a plurality of material injection channels are further formed in the rear side of the interior of the spray head body, the front ends of the material injection channels are connected and communicated with the rear ends of the sand blasting channels, and the front ends of the material injection channels are communicated with the rear ends of the sand blasting channels. At least one material injection channel is provided with a switch control device used for controlling the on or off state of the material injection channel. And a nozzle opening degree adjusting mechanism is also formed on the nozzle part and is used for changing the opening size of the nozzle part when the sand blasting particles are jetted and discharged outwards.

Description

Technical Field

[0001] The utility model relates to the field of workpiece surface sandblasting equipment, in particular to a sandblasting device nozzle with adjustable flow rate. Background Art

[0002] Sandblasting is a method of using compressed air to spray abrasives onto metal surfaces for treatment. Sandblasting sprays sand and other media onto the surface of an object through a high-speed sand flow. This impact can effectively remove impurities on the surface of the object and improve the fatigue resistance, adhesion and durability of metal workpieces. Sandblasting can also remove rust and old paint layers on the surface of the workpiece, prepare a good foundation for coating, bonding or other finishing, and enhance the bonding strength between the coating or adhesive and the workpiece surface. In the wet sandblasting process, abrasives are mixed with water into a slurry-like substance and then sprayed. This is usually used to prevent oxidation or rust of metal materials during the treatment process. The nozzle components in the sandblasting equipment play a key role in accelerating the abrasive to a high-speed spray state in the sandblasting process. The nozzle components are responsible for pushing the abrasive to the surface of the workpiece to achieve the effect of high-speed spraying, thereby completing the cleaning and pretreatment of the workpiece surface. By precisely controlling the nozzle components, different degrees of surface treatment effects can be achieved, ranging from slight cleaning to complete surface reshaping.

[0003] For example, a sandblasting machine nozzle with adjustable sandblasting amount disclosed in the Chinese invention patent document with application number CN201510638718.8 includes a nozzle body, a plurality of sandblasting ports are arranged on the front end surface of the nozzle body, the sandblasting ports are evenly distributed on the front end surface of the nozzle body, the rear end of the sandblasting ports is connected to a sandblasting conduit, the sandblasting conduit is provided with an opening and closing valve, a material spraying main pipe is arranged at the rear end of the nozzle body, the sandblasting conduits are connected to the material spraying main pipe, and the rear end of the material spraying main pipe is connected to a sandblasting pressure vessel. In the above manner, the invention scheme can selectively close the corresponding sandblasting ports according to the demand for sandblasting amount, and the closing and opening selection is convenient and fast, and the operation is simple.

[0004] The adjustable sandblasting device nozzle device provided in the above scheme can adjust the flow rate of the sandblasting particles by changing the number of pipes passing into the nozzle device, thereby changing the sandblasting process treatment effect on the workpiece surface. However, the inventors of the present application found that since only the amount of sandblasting particles entering the process was changed, but the caliber of the nozzle opening was not adaptively adjusted, it is easy to cause the flow rate and injection state of the sandblasting particles to become difficult to control during the process of being discharged from the nozzle opening. Especially for some treatment surfaces with smaller target areas, the nozzle device of this structure will reduce the flow rate while reducing the flow rate, thereby failing to meet the surface treatment requirements, and it is also easy to cause the loss of sandblasting particles outside the target range, resulting in waste.

[0005] In view of the above problems, the utility model provides a method for adaptively changing the size of the nozzle opening while adjusting the sandblasting particles discharged from the nozzle, so as to achieve precise control and adjustment of the flow spraying state of the sandblasting particles discharged out of the nozzle without changing the state of the compressed air serving as the power source. Utility Model Content

[0006] The utility model provides a device which can adaptively change the size of the nozzle opening while adjusting the sandblasting particles discharged from the nozzle, so as to achieve accurate control and adjustment of the flow spraying state of the sandblasting particles discharged from the nozzle without changing the state of the compressed air as the power source.

[0007] The above technical objectives of the utility model are achieved through the following technical solutions:

[0008] A nozzle of a sandblasting device with adjustable flow rate, characterized in that it includes a nozzle body, the front end of the nozzle body extends forward to form a nozzle portion, a sandblasting channel is formed in the nozzle portion for sandblasting particles to be ejected outward, and a plurality of injection channels are also formed on the rear side of the interior of the nozzle body, the front end of the injection channel is connected and conducted with the rear end of the sandblasting channel, at least one of the injection channels is provided with a switch control device for controlling its conduction or closed state; a nozzle opening adjustment mechanism is also formed on the nozzle portion, which is used to change the opening size of the nozzle portion when sandblasting particles are ejected outward.

[0009] As a preferred embodiment of the present invention, the nozzle opening adjustment mechanism includes a first adjusting piece fixedly provided on the nozzle portion and a second adjusting piece movably provided on the nozzle portion, and the first adjusting piece and the second adjusting piece are respectively provided with conducting openings, and the second adjusting piece can rotate relative to the first adjusting piece and change the size of the overlapping area of ​​the conducting openings respectively located on the two adjusting pieces in the axial direction of the nozzle portion.

[0010] As a preferred embodiment of the present invention, the conducting opening is in an elliptical shape that gradually shrinks from the center of the regulating piece to both ends.

[0011] As a preferred embodiment of the present invention, the injection channel includes an inner pipeline located near the center of the nozzle and an outer pipeline located near the outer periphery of the nozzle, and the outer pipelines are each provided with an independent switch control device.

[0012] As a preferred embodiment of the present invention, movable blocking sheets are further provided on the first adjusting sheet and the second adjusting sheet for changing the size of the conducting opening formed by a single adjusting sheet.

[0013] As a preferred embodiment of the present invention, a plurality of notches are formed on the outer side of the second adjustment sheet to facilitate the user to perform rotational adjustment on the second adjustment surface.

[0014] As a preferred embodiment of the present invention, an arc-shaped transition portion is formed between the injection channel and the sandblasting channel.

[0015] In summary, the utility model can achieve the following beneficial effects:

[0016] The adjustable flow rate sandblasting device nozzle provided in the utility model can adaptively change the size of the nozzle opening while adjusting the sandblasting particles discharged from the nozzle, so as to achieve precise control and adjustment of the flow spraying state of the sandblasting particles discharged outward from the nozzle without changing the state of the compressed air as the power source. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal structure of the adjustable flow rate sandblasting device when the injection channel in the nozzle is fully opened;

[0018] Figure 2 It is a schematic diagram of the internal structure of the adjustable flow rate sandblasting device in which only the inner pipeline is opened in the nozzle;

[0019] Figure 3 A schematic diagram of the principle of a nozzle opening adjustment mechanism formed by the cooperation of a first adjustment piece and a second adjustment piece;

[0020] Figure 4 is a schematic diagram of the three-dimensional structure of the second adjustment sheet;

[0021] Figure 5 It is a schematic diagram of the structure of an adjustment piece provided with a movable barrier piece;

[0022] Figure 6 The schematic diagram is a principle diagram of a nozzle opening adjustment mechanism formed by the adjustment piece provided with a movable baffle piece;

[0023] Figure 7 It is a three-dimensional structural schematic diagram of the nozzle opening adjustment mechanism.

[0024] In the figure:

[0025] 1——nozzle body, 101——nozzle part;

[0026] 2 – sandblasting channel;

[0027] 3——injection channel, 301——switch control device, 302——inner pipeline, 303——outer pipeline;

[0028] 4——spout opening adjustment mechanism, 401——first adjustment piece, 402——second adjustment piece, 403——conduction opening, 404——movable blocking piece, 405——notch portion,

[0029] 5——Arc-shaped transition section. DETAILED DESCRIPTION

[0030] The following specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0031] This solution is achieved through the following technical means:

[0032] Embodiment: In this embodiment, a nozzle of a sandblasting device with adjustable flow rate is provided. Figure 1 According to the structural diagram given, the nozzle component first includes a nozzle body 1 with multiple pipelines formed inside, the front end of the nozzle body 1 extends forward to form a cylindrical nozzle portion 101, and a sandblasting channel 2 is formed inside the nozzle portion 101 for the active sandblasting particles to be discharged outward by sandblasting, and a plurality of injection channels 3 are opened on the rear side of the nozzle body 1 to facilitate the sandblasting particles to enter the interior of the nozzle component from the pipeline. In order to reduce the loss of the kinetic energy of the sandblasting particles at the confluence and bend in the process of the sandblasting particles merging from the various injection channels 3 and entering the sandblasting channel 2, an arc-shaped transition portion 5 is formed between the injection channel 3 and the sandblasting channel 2, which can not only allow the sandblasting particles to pass more conveniently, but also reduce the wear of the internal pipeline of the nozzle component, thereby extending the service life of the device as a whole.

[0033] Similar to the existing nozzle components with adjustable flow rate, the nozzle provided in this embodiment is provided with a switch control device 301 on at least one injection channel 3 for controlling the on or off state of the injection channel 3. Figure 1The cross-sectional structure of the nozzle in the vertical direction shown in the embodiment is a cylindrical state as a whole, and the aforementioned injection channels 3 are evenly distributed and arranged in a vertical circular surface. Taking the structure given in the drawings of the specification as an example, the plurality of injection channels 3 can be at least divided into a group of outer pipelines 303 arranged in a circular ring on the outside, and a group of inner pipelines 302 arranged in a circular ring on the inside. The inner pipeline 302 is connected to the aforementioned sandblasting channel 2, and each of the outer pipelines 303 is installed with a valve mechanism with a cut-off function as the aforementioned switch control device 301. It should be noted that, here, both the inner pipeline 302 and the outer pipeline 303 are connected to the respective independent sandblasting particle equipment or a sandblasting particle supply chamber unit through independent pipeline passages, so at this time, the flow rate and flow rate of the sandblasting particles injected into the nozzle component through each inner pipeline 302 or outer pipeline 303 are fixed. The number of outer pipelines 303 opened can directly and accurately adjust and control the flow rate and flow rate of the sandblasting particles finally ejected by the nozzle component.

[0034] A key discovery in the present application is that the applicant has noticed that if the fixed caliber of the sandblasting channel 2 formed in the nozzle portion 101 is always maintained, it is easy for the pressure of the sandblasting particles that are gathered from the various injection channels 3 and enter the sandblasting channel 2 to be too high, making it difficult to control the flow state of the sandblasting particles discharged from the nozzle. When the number of pipes connected to the sandblasting channel 2 is small, it is easy for the pressure to be insufficient during the outward spraying of the sandblasting particles, resulting in a large power loss of some particles close to the inner wall of the nozzle, which in turn causes the particles to fall downward and cannot be stably and controllably sprayed on the surface of the workpiece to be processed, thereby affecting the performance processing quality of the workpiece.

[0035] Considering this problem, in the present application, on the basis of the original nozzle structure, a nozzle opening adjustment mechanism 4 is provided on the nozzle portion 101 to change the opening size of the nozzle portion 101 when the sandblasting particles are ejected outward. Specifically, the working principle of the nozzle opening adjustment mechanism 4 can be referred to the attached manual. Figure 3As shown, it mainly includes two parts, namely, a first adjusting piece 401 fixedly arranged on the nozzle part 101 and a second adjusting piece 402 movably arranged on the nozzle part 101, and a conducting opening 403 is respectively provided on the first adjusting piece 401 and the second adjusting piece 402. In the present embodiment, the conducting opening 403 here is designed to be an ellipse that gradually shrinks from the center of the adjusting piece to both ends. Here, the second adjusting piece 402 can rotate relative to the first adjusting piece 401 and change the size of the overlapping area of ​​the conducting openings 403 respectively located on the two adjusting pieces in the axial direction of the nozzle part 101, thereby changing the opening size of the outermost port of the sandblasting channel 2 through which the sandblasting particles can pass smoothly. At this time, the second adjusting piece 402 can be rotated to adjust the size of the opening that the sandblasting particles finally pass through during the discharge process according to the total number of the outer pipeline 303 and the inner pipeline 302 that are opened and conducted, thereby reducing the uncontrollable influence of the aforementioned situation on the sandblasting process.

[0036] Embodiment 2: The structure of the nozzle of the adjustable flow rate sandblasting device provided in this embodiment is further optimized and improved on the basis of the solution in Embodiment 1. Figure 5 and 6 The structural diagram given shows that, based on the original structure of the first adjustment piece 401 and the second adjustment piece 402, an interactive barrier piece capable of translational movement is further installed at the conduction opening 403. For example, the movable barrier piece 404 here can be made of a metal sheet with high structural strength. According to different sandblasting process requirements and the type of sandblasting particles selected, movable barrier pieces 404 of different sizes can be installed to change the size of the conduction opening 403 formed by a single adjustment piece, so that the opening size of the nozzle has a larger adjustment range and higher adaptability.

[0037] Further preferably, in order to more conveniently rotationally drive the second adjusting piece 402 to rotate the first adjusting piece 401 , a plurality of notches 405 may be formed on the outer side of the second adjusting piece 402 .

[0038] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A nozzle for a sandblasting device with adjustable flow rate, characterized in that: The invention comprises a nozzle body (1), the front end of the nozzle body (1) extending forward to form a nozzle portion (101), the nozzle portion (101) forming a sandblasting channel (2) for ejecting sandblasting particles outward, a plurality of injection channels (3) formed on the rear side of the nozzle body (1), the front end of the injection channel (3) being connected and conducted with the rear end of the sandblasting channel (2), at least one of the injection channels (3) being provided with a switch control device (301) for controlling its conduction or closed state; and a nozzle opening adjustment mechanism (4) is also formed on the nozzle portion (101) for changing the opening size of the nozzle portion (101) when the sandblasting particles are ejected outward.

2. The nozzle of the adjustable flow rate sandblasting device according to claim 1, characterized in that: The nozzle opening adjustment mechanism (4) comprises a first adjustment plate (401) fixedly arranged on the nozzle portion (101) and a second adjustment plate (402) movably arranged on the nozzle portion (101), wherein the first adjustment plate (401) and the second adjustment plate (402) are respectively provided with a conducting opening (403), and the second adjustment plate (402) is capable of rotating relative to the first adjustment plate (401) and changing the size of the overlapping area of ​​the conducting openings (403) respectively located on the two adjustment plates in the axial direction of the nozzle portion (101).

3. The adjustable flow rate sandblasting device nozzle according to claim 2, characterized in that: The conducting opening (403) is in the shape of an ellipse that gradually contracts from the center of the regulating piece toward both ends.

4. The nozzle of the adjustable flow rate sandblasting device according to claim 3, characterized in that: The injection channel (3) comprises an inner pipeline (302) located near the center of the nozzle and an outer pipeline (303) located near the outer periphery of the nozzle, and each of the outer pipelines (303) is provided with an independent switch control device (301).

5. The nozzle of the adjustable flow rate sandblasting device according to claim 4, characterized in that: The first adjustment sheet (401) and the second adjustment sheet (402) are also provided with movable blocking sheets (404) for changing the size of the conducting opening (403) formed by a single adjustment sheet.

6. The nozzle of the adjustable flow rate sandblasting device according to claim 5, characterized in that: A plurality of notches (405) are also formed on the outer side of the second adjustment piece (402) to facilitate the user to perform rotational adjustment on the second adjustment piece.

7. The nozzle of the adjustable flow rate sandblasting device according to claim 6, characterized in that: A circular arc transition portion (5) is formed between the injection channel (3) and the sandblasting channel (2).

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