A method of spraying a hole and a spraying protection tool

Abstract

The present application relates to a kind of inner hole spray protection tool and spray shielding method, inner hole spray protection tool includes: for the shielding piece of fitting test piece hole wall, the shielding piece is curved and extends into barrel shape along ring direction, the shielding piece can be curled;When the ring direction both ends of the shielding piece are curled along ring direction, the both ends of the shielding piece are staggered and overlapped, the outer diameter of the shielding piece is less than the inner diameter of the test piece;When the shielding piece is placed in the hole of the test piece, and the ring direction both ends of the shielding piece are loosened, the end surface of the ring direction both ends of the shielding piece is fitted, and the shielding piece is radially tensioned and fitted on the hole wall of the test piece.Shielding piece can be curled first when installing shielding piece, then the curled shielding piece is stretched to the shielding area in the test piece inner hole, finally the shielding piece is expanded and fitted with the inner hole hole wall of test piece, the installation of shielding piece is realized.The installation process is simpler than the shielding piece with constant diameter.Improves the efficiency of spraying.

Description

Technical Field

[0001] This invention relates to the field of spray coating, and in particular to a protective fixture for internal hole spraying and a spray masking method. Background Technology

[0002] Cold spraying is a novel and advanced surface coating technology that utilizes aerodynamic principles. Compressed gas is first heated in a preheating device to become a high-pressure gas at a specific temperature. This gas is then mixed with powder particles and fed into a Laval nozzle, generating a supersonic gas-solid two-phase flow. This causes the powder particles to reach velocities of 400-1200 m / s. Driven by the supersonic airflow, the powder particles impact the substrate at high speed, undergoing intense plastic deformation and depositing on the substrate surface to form a coating. This technology can generate a dense, thick coating on the surface of parts, thereby forming an additive structure. The coating material provides antioxidant and corrosion-resistant properties to the substrate surface.

[0003] In related technologies, during the spraying of tubular parts, it is often necessary to avoid certain areas. To avoid these areas, the areas to be avoided during the spraying process are masked. This is often done by installing a tubular masking component into the inner hole of the tubular part to be sprayed. To prevent the masking component from shaking relative to the part to be sprayed during the spraying process, a masking component with an outer diameter equal to the inner diameter of the part to be sprayed is selected.

[0004] However, since the outer diameter of the masking part is equal to the inner diameter of the part to be painted, the masking part is difficult to install, which greatly increases the difficulty of painting. Summary of the Invention

[0005] This invention provides an internal hole spraying protective fixture and a spraying masking method to solve the problem of difficult installation of masking components in related technologies.

[0006] In a first aspect, an internal hole spraying protective fixture is provided, comprising: a shielding member for conforming to the hole wall of a test specimen, the shielding member being bent and extended in a circumferential direction into a barrel shape, the shielding member being rollable; when the two ends of the shielding member are rolled in the circumferential direction so that the two ends of the shielding member overlap, the outer diameter of the shielding member is smaller than the inner diameter of the test specimen; when the shielding member is placed in the hole of the test specimen and the two ends of the shielding member are loosened, the end faces of the two ends of the shielding member conform to each other in the circumferential direction, and the shielding member is radially tensioned and conforming to the hole wall of the test specimen.

[0007] In some embodiments, the shielding member has a first end and a second end extending in a circumferential direction, a drive mechanism is fixed inside the first end, and a traction unit is provided inside the second end, the drive mechanism being able to pull the traction unit to curl the shielding member.

[0008] In some embodiments, the drive mechanism includes a motor and a drive gear, the drive gear being connected to the main shaft of the motor; the traction unit is an arc-shaped rack, the arc-shaped rack meshing with the drive gear.

[0009] In some embodiments, the drive mechanism further includes a fixing block with a guide hole, into which the traction unit is inserted.

[0010] In some embodiments, a limiting block is provided at the end of the traction unit away from the second end. The limiting block is located on the side of the fixing block away from the second end, and the outer contour dimension of the limiting block is larger than the inner diameter of the guide hole.

[0011] In some embodiments, the first end is provided with at least two drive mechanisms, and the second end is provided with a corresponding number of traction units, and the traction units are arranged in parallel to each other.

[0012] In some embodiments, the end face of the first end is a first guide slope, and the end face of the second end is a second guide slope; when the driving mechanism pulls the traction unit, the first guide slope slides along the second guide slope to guide the first end and the second end to overlap.

[0013] In some embodiments, anti-stick chamfers are provided at both ends of the shielding member, so that the end of the shielding member 1 forms an angled structure. When the outer wall of the shielding member is in contact with the hole wall of the test piece, the anti-stick chamfer leaves a gap with the hole wall of the test piece.

[0014] In some embodiments, the internal hole spraying protective fixture further includes a vent pipe, which includes a straight pipe section and a tapered pipe section arranged coaxially. The diameter of the tapered pipe section where it connects to the straight pipe section is equal to the diameter of the straight pipe section. The diameter of the tapered pipe section gradually decreases in the direction away from the straight pipe section. The tapered surface of the tapered pipe section is provided with a plurality of spaced vents, which are used to connect to a venting device. When in use, the straight pipe section is sleeved on the outside of the test piece, and the vents communicate with the internal hole of the test piece.

[0015] In some embodiments, a fixed flange is provided at the end of the straight pipe section away from the tapered pipe section, the fixed flange being used for bolt connection with the mounting flange of the specimen.

[0016] Secondly, a spray masking method using the above-mentioned internal hole spraying protective fixture is provided, comprising the following steps: curling the two circumferential ends of the masking member in the circumferential direction so that the two circumferential ends of the masking member overlap and the outer diameter of the masking member is smaller than the inner diameter of the test piece; extending the curled masking member to the masking area of ​​the inner hole of the test piece; loosening the two circumferential ends of the masking member so that the masking member is stretched tightly against the hole wall of the test piece radially outward.

[0017] In some embodiments, the inner hole spraying protective fixture includes a vent pipe, and the spraying masking method further includes: fitting a straight section of the vent pipe over the specimen; connecting the venting device to the vent provided on the conical surface of the conical pipe section; and venting the venting device to the vent and spraying the inner hole of the specimen.

[0018] The beneficial effects of the technical solution provided by this invention include:

[0019] This invention provides an internal hole spraying protective fixture and a spraying masking method. When the masking component is installed in the internal hole of a test specimen, it stretches radially outward and tightly adheres to the hole wall, achieving masking of the specimen during spraying. The masking component can be rolled up; the outer diameter of the rolled-up masking component is smaller than the inner diameter of the test specimen. During installation, the masking component can be rolled up first, then extended to the area to be masked within the internal hole of the test specimen, and finally expanded outward to fit against the hole wall, thus completing the installation. The installation process is simpler compared to masking components with a fixed diameter, improving spraying efficiency. Therefore, it reduces the difficulty of masking component installation and improves spraying efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal hole spraying protection tool provided in this embodiment of the invention when installed on a test piece;

[0022] Figure 2 This is a schematic diagram of the main structure of the shielding component provided in an embodiment of the present invention;

[0023] Figure 3 This is a side view of the shielding component provided in an embodiment of the present invention.

[0024] 1. Shielding component; 11. Drive mechanism; 111. Drive gear; 112. Fixing block; 113. Guide hole; 12. Traction unit; 13. Limiting block; 14. First guide slope; 15. Second guide slope; 16. Anti-stick chamfer;

[0025] 2. Vent pipe; 21. Straight pipe section; 22. Tapered pipe section; 23. Vent port; 24. Fixed flange;

[0026] 3. Specimen; 31. Installation flange. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This invention provides an internal hole spraying protective fixture and spraying masking method, which can solve the problem of difficult installation of masking parts in related technologies.

[0029] See Figure 1 and Figure 2 As shown, an embodiment of the present invention provides an internal hole spraying protective fixture, which may include: a shielding member 1 for adhering to the hole wall of a test specimen 3. The shielding member 1 is bent and extended in a barrel shape in the circumferential direction, and the shielding member 1 is rollable. When the two ends of the shielding member 1 are rolled in the circumferential direction so that the two ends of the shielding member 1 overlap, the outer diameter of the shielding member 1 is smaller than the inner diameter of the test specimen 3. When the shielding member 1 is placed in the hole of the test specimen 3 and the two ends of the shielding member 1 are loosened, the end faces of the two ends of the shielding member 1 are adhered to each other in the circumferential direction, and the shielding member 1 is radially tensioned and adhered to the hole wall of the test specimen 3. That is to say, by radially tensioning and adhering to the hole wall of the test specimen 3, when spraying the internal hole of the test specimen 3, the shielding member 1 can prevent the sprayed powder particles from adhering to the shielded area of ​​the test specimen 3, thus preventing the entire internal hole of the test specimen 3 from being sprayed. Compared to a tubular shielding structure with the same inner diameter as the specimen 3, the shielding member 1 can be rolled up. When it needs to be installed in the inner hole of the specimen 3, the shielding member 1 can be rolled up circumferentially at both ends, with the two ends overlapping each other. The outer diameter of the rolled-up shielding member 1 is reduced, making it relatively easy to insert into the inner hole of the specimen 3. When the shielding member 1 reaches the area to be shielded in the specimen 3, the two ends of the shielding member 1 are loosened. Driven by its own elasticity, the two ends of the shielding member 1 are stretched outward, and the outer wall of the shielding member 1 is stretched and adhered to the hole wall of the specimen 3. This achieves the fixation of the shielding member 1. The installation process of the shielding member 1 is simple, reducing the difficulty of installing the inner hole shielding structure. In this embodiment, the shielding member 1 can be rolled up circumferentially by manual compression, or the shielding member 1 can be rolled up circumferentially by the drive mechanism 11 pulling the traction unit 12.

[0030] See Figure 1 as well as Figure 2As shown, in some optional embodiments, the shielding member 1 has a first end and a second end extending circumferentially. A drive mechanism 11 is fixed to the inner side of the first end, and a traction unit 12 is provided on the inner side of the second end. The drive mechanism 11 can pull the traction unit 12 to curl the shielding member 1. That is, by pulling the traction unit 12 fixed to the second end through the drive mechanism 11 fixed to the inner side of the first end, the second end is pulled closer to the drive mechanism 11, thereby achieving circumferential curling of the shielding member 1. Compared with manual curling, this reduces the workload of workers installing the shielding member 1. The traction unit 12 can be a rope, which is wound around the shielding member 1 by the drive mechanism 11 to achieve curling of the shielding member 1. The traction unit 12 can also be a rack and pinion, which is driven by a gear on the drive mechanism 11 to move the traction unit 12, thereby achieving curling of the shielding member 1.

[0031] See Figure 1 and Figure 2 As shown, in some optional embodiments, the drive mechanism 11 includes a motor and a drive gear 111, the drive gear 111 being connected to the main shaft of the motor; the traction unit 12 is an arc-shaped rack, which meshes with the drive gear 111. By setting the traction unit 12 as an arc-shaped rack, and using the drive gear 111 of the drive mechanism 11 to drive the arc-shaped rack to move, the forward and reverse rotation of the motor can be used to adjust the movement direction of the traction unit 12, thereby controlling the curling and uncurling of the shielding member 1. A remote control module can be installed on the drive mechanism 11, allowing the operator to remotely control the rotation of the motor to achieve the curling of the shielding member 1, reducing the difficulty of operation for the operator.

[0032] See Figure 1 and Figure 2 As shown, in some optional embodiments, the drive mechanism 11 further includes a fixing block 112, which has a guide hole 113, into which the traction unit 12 is inserted. By providing a guide hole 113 on the fixing block 112 and inserting the traction unit 12 into the guide hole 113, the direction of movement of the traction unit 12 can be restricted using the guide hole 113. In this embodiment, the guide hole 113 is a hole extending circumferentially along the axis of the shielding member 1. By providing a circumferentially extending guide hole 113, the traction unit 12 can be guided to move circumferentially, preventing the traction unit 12 from detaching from the drive mechanism 11 during the curling process due to axial deflection.

[0033] See Figure 2As shown, in some optional embodiments, a limiting block 13 is provided at the end of the traction unit 12 away from the second end. The limiting block 13 is located on the side of the fixing block 112 away from the second end, and the outer contour dimension of the limiting block 13 is larger than the inner diameter of the guide hole 113. By fixing the traction unit 12 to the end of the limiting block 13 with an outer contour dimension larger than the inner diameter of the guide hole 113, the traction unit 12 can be prevented from disengaging from the guide hole 113. Excessive circumferential expansion of the shielding member 1 is also prevented.

[0034] See Figure 2 as well as Figure 3 As shown, preferably, the first end is provided with at least two of the aforementioned driving mechanisms 11, and the second end is provided with a corresponding number of traction units 12, with the traction units 12 arranged parallel to each other. The parallel arrangement of the traction units 12 better restricts the curling direction of the shielding member 1. By simultaneously pulling the corresponding traction units 12 through the two driving mechanisms 11, in this embodiment, the first end is provided with two driving mechanisms 11, and the two driving mechanisms 11 are respectively located at both ends of the first end along the axial direction of the shielding member 1. In other embodiments, a greater number of traction units 12 can be provided to achieve the curling of the shielding member 1.

[0035] See Figure 1 as well as Figure 2 As shown, in some optional embodiments, the end face of the first end is a first guide slope 14, and the end face of the second end is a second guide slope 15. When the driving mechanism 11 pulls the traction unit 12, the first guide slope 14 slides along the second guide slope 15 to guide the first end and the second end to overlap. By setting the circumferential ends of the shielding member 1 as matching guide slopes, the difficulty of the circumferential ends overlapping during the curling process is reduced.

[0036] Preferably, anti-stick chamfers 16 are provided at both axial ends of the shielding member 1, forming an angled structure at the end of the shielding member 1. When the outer wall of the shielding member 1 is in contact with the hole wall of the specimen 3, the anti-stick chamfers 16 of the shielding member 1 have a gap with the hole wall of the specimen 3 due to the angled structure. There is a 2mm height difference between the angled structure and the hole wall of the specimen 3. During the spraying process, the paint will not stick the end of the shielding member 1 to the inner wall of the specimen 3. This facilitates the subsequent disassembly of the shielding member 1.

[0037] See Figure 1As shown, in some optional embodiments, the internal hole spraying protective fixture further includes a vent pipe 2. The vent pipe 2 includes a straight pipe section 21 and a tapered pipe section 22 arranged coaxially. The diameter of the tapered pipe section 22 at the connection with the straight pipe section 21 is equal to the diameter of the straight pipe section 21. The diameter of the tapered pipe section 22 gradually decreases in the direction away from the straight pipe section 21. The tapered surface of the tapered pipe section 22 is provided with several spaced vents 23, which are used to connect to a ventilation device. When in use, the straight pipe section 21 is sleeved on the outside of the test piece 3, and the vents 23 communicate with the internal hole of the test piece 3. That is, by installing the vent pipe 2 on the outside of the test piece 3, air is vented to the test piece 3 through the vents 23 of the tapered pipe section 22 during spraying, thereby achieving cold spraying of the internal hole of the test piece 3. Since the vents 23 are located on the tapered pipe section 22 with a gradually decreasing diameter, and the tapered pipe section 22 is coaxially arranged with the straight pipe section 21. This allows the spraying material to be sprayed at an angle towards the axis of specimen 3 during ventilation, reducing adhesion to the ends of specimen 3.

[0038] In this embodiment, a fixed flange 24 is provided at the end of the straight pipe section 21 away from the tapered pipe section 22. The vent pipe 2 is installed on the test specimen 3 by fixing the fixed flange 24 to the mounting flange 31 of the test specimen 3. The fixed flange 24 is fixedly connected to the mounting flange 31 by bolts.

[0039] This invention also provides a spray masking method using the aforementioned internal hole spraying protective fixture, comprising the following steps: circumferentially curling the two ends of the masking member 1 so that the two ends overlap, with the outer diameter of the masking member 1 being smaller than the inner diameter of the specimen 3; extending the curled masking member 1 into the masking area of ​​the inner hole of the specimen 3; loosening the two ends of the masking member 1 circumferentially, so that the masking member 1 is stretched radially outward and adhered to the hole wall of the specimen 3. By circumferentially curling the masking member 1, the radius of the flexible masking member 1 is reduced, making it easy to extend the masking member 1 into the masking area of ​​the inner hole of the specimen 3. By loosening the two ends of the masking member 1 circumferentially, the masking member 1 returns to its original position under its own elastic drive, with its outer diameter equal to the hole diameter of the specimen 3, and the masking member 1 adheres to the hole wall of the specimen 3 under its own elastic tension. This allows the masking member 1 to achieve the effect of masking part of the inner wall of the specimen 3. Compared to other masking components, this method provides a spray masking method that is easier to install, and can improve the efficiency of installation and disassembly before and after spraying.

[0040] The spray masking method also includes: fitting the straight section 21 of the vent pipe 2 over the specimen 3; connecting the venting device to the vent 23 on the conical surface of the conical section 22; and venting the venting device through the vent 23 and spraying the coating into the inner hole of the specimen 3. By using the vent pipe 2 to achieve spraying between the venting device and the inner hole of the specimen 3, the spraying direction can be guided, reducing leakage of the sprayed material.

[0041] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0042] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A protective tooling for internal hole spraying, characterized in that, It includes: A shielding member (1) for fitting the hole wall of the specimen (3), the shielding member (1) is bent and extended in a barrel shape in the circumferential direction, and the shielding member (1) can be rolled up; When the two ends of the shielding member (1) are rolled up in the circumferential direction so that the two ends of the shielding member (1) overlap, the outer diameter of the shielding member (1) is smaller than the inner diameter of the test piece (30); When the shielding member (1) is placed in the hole of the test piece (3) and the two ends of the shielding member (1) are loosened, the end faces of the shielding member (1) along the two ends of the circumferential direction are attached together, and the shielding member (1) is stretched and attached to the hole wall of the test piece (3) in the radial direction. The shielding member (1) has anti-stick chamfers at both ends of its axial direction so that the end of the shielding member (1) forms an angled structure. When the outer wall of the shielding member (1) is in contact with the hole wall of the test piece (3), the anti-stick chamfers leave a gap with the hole wall of the test piece (3). The shielding member (1) has a first end and a second end extending in a circumferential direction. A drive mechanism (11) is fixed on the inner side of the first end, and a traction unit (12) is provided on the inner side of the second end. The drive mechanism (11) can pull the traction unit (12) to curl the shielding member (1). The drive mechanism (11) includes a motor and a drive gear (111), the drive gear (111) being connected to the main shaft of the motor; The traction unit (12) is an arc-shaped rack, which meshes with the drive gear (111).

2. The internal hole spraying protective fixture as described in claim 1, characterized in that: The drive mechanism (11) also includes a fixing block (112), on which a guide hole (113) is provided, and the traction unit (12) is inserted into the guide hole (113).

3. The internal hole spraying protective fixture as described in claim 2, characterized in that: The traction unit (12) has a limiting block (13) at one end away from the second end. The limiting block (13) is located on the side of the fixing block (112) away from the second end. The outer contour dimension of the limiting block (13) is larger than the inner diameter of the guide hole (113).

4. The internal hole spraying protective fixture as described in claim 1, characterized in that: The first end is provided with at least two drive mechanisms (11), and the second end is provided with a corresponding number of traction units (12), and the traction units (12) are arranged in parallel to each other.

5. The internal hole spraying protective fixture as described in claim 1, characterized in that; The end face of the first end is a first guide slope (14), and the end face of the second end is a second guide slope (15). When the drive mechanism (11) pulls the traction unit (12), the first guide slope (14) slides along the second guide slope (15) to guide the first end and the second end to overlap.

6. The internal hole spraying protective fixture as described in claim 1, characterized in that: The internal hole spraying protective tooling also includes a vent pipe (2), which includes a straight pipe section (21) and a tapered pipe section (22) arranged coaxially. The diameter of the tapered pipe section (22) connected to the straight pipe section (21) is equal to the diameter of the straight pipe section (21). The diameter of the tapered pipe section (22) gradually decreases as it moves away from the straight pipe section (21). The tapered surface of the tapered pipe section (22) is provided with a number of spaced vents (23), which are used to connect to a ventilation device. When in use, the straight pipe section (21) is fitted over the test piece (3), and the vent (23) is connected to the inner hole of the test piece (3).

7. A spraying masking method using the internal hole spraying protective fixture as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The two ends of the shielding member (1) are rolled up in the circumferential direction so that the two ends of the shielding member (1) overlap in the circumferential direction and the outer diameter of the shielding member (1) is smaller than the inner diameter of the specimen (3); Extend the curled shielding part (1) into the shielding area of ​​the inner hole of the specimen (3); Loosen the shielding member (1) around both ends so that the shielding member (1) is stretched outward in the radial direction and fits tightly against the hole wall of the test piece (3).

8. The spray masking method as described in claim 7, characterized in that, The internal hole spraying protective fixture includes a vent pipe (2), and the spraying masking method further includes: The straight section (21) of the vent pipe (2) is fitted over the specimen (3); Connect the ventilation device to the ventilation port (23) set on the conical surface of the conical tube section (22); The ventilation device vents air through the vent (23) and sprays it into the inner hole of the specimen (3).

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