Part magazine spraying device and non-sprayed surface protection method

Abstract

The application discloses a kind of part machine case spraying device and non-spraying surface protection method, device includes upper end protection device and lower end protection device, wherein lower end protection again contains positioning plate, lifting plate, movable plate and lifting screw, movable plate is split into multiple pieces, then from spraying surface is placed into the area between spraying surface and non-spraying surface, is supported by positioning plate, lifting plate is lifted and movable plate is driven to move to the junction of spraying surface and non-spraying surface, finally form the shielding structure of the outer diameter greater than the inner diameter of spraying surface, complete protection.The application changes the traditional protection idea, and designs the spraying device in combination with the structural characteristics of part machine case, simple operation, good protection effect.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine manufacturing technology, specifically relating to a device for spraying paint on a component casing and a method for protecting non-sprayed surfaces. Background Technology

[0002] like Figure 1 The image shown is a three-dimensional sectional view of a component housing. Figure 5 As shown, the sprayed surface is a localized narrow annular surface. The lower part of the sprayed surface forms a V-shaped cross-section annular cavity structure, while the upper part of the sprayed surface is connected to a conical cylinder. According to the processing requirements of the part casing, the non-sprayed areas need to be shielded and protected during sandblasting and spraying.

[0003] However, the structure of this component's casing has the following characteristics: ① The opening is small and the belly is large. That is, the opening at the junction of the lower end of the sprayed surface and the V-shaped cross-section annular cavity structure is very small relative to the volume of the annular cavity of the V-shaped cross-section annular cavity structure. Once foreign matter enters the cavity during sandblasting and spraying, the subsequent cleaning work is very difficult and time-consuming. ②The distance h=10mm between the upper and lower annular surfaces at the entrance of the V-shaped cross-section annular cavity is very narrow and not easy to be sealed and protected by traditional methods; ③ The impact force is large during sandblasting and spraying, and traditional flexible sealing methods cannot prevent foreign objects from entering the cavity under the impact.

[0004] These characteristics mean that traditional design approaches cannot be used when designing protective devices for non-coated surfaces. Summary of the Invention

[0005] The present invention aims to provide a device for spraying parts housing and a method for protecting non-sprayed surfaces. Breaking with conventional design, it creates a protective device for non-sprayed surfaces, overcomes the structural difficulties of parts housing, protects parts that do not need to be sprayed, and is simple to operate with good protection effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for spraying a parts housing, the parts housing including a cylindrical spraying surface, one axial end face of the spraying surface connected to a conical structure, and the other axial end face of the spraying surface connected to a V-shaped cross-section annular cavity structure. The spraying device includes an upper end protection device and a lower end protection device, wherein: The upper protective device includes an annular surface and a frustum surface. The annular surface and the frustum surface are coaxial. The inner ring of the annular surface is connected to the large-diameter end face of the frustum surface to form an upper cover. The inner diameter of the small-diameter end of the frustum surface is equal to the inner diameter of the spraying surface. A positioning structure is also connected to the annular surface. The positioning structure extends toward the small-diameter end face of the conical surface and is connected to the part housing. The lower end protection device includes a positioning plate, a lifting plate, a movable plate, and a lifting screw, wherein: The maximum outer diameter of the positioning plate and the lifting plate is smaller than the inner diameter of the sprayed surface but larger than the minimum inner diameter of the inner ring of the V-shaped cross-section annular cavity structure. There is a positioning hole on the positioning plate and a boss on the lifting plate. A threaded through hole is opened on the boss. The movable panel has a fan-shaped structure. Multiple movable panels can be spliced ​​together to form a complete circle, and the diameter of the circle is larger than the inner diameter of the spraying surface. The movable panel and the boss on the lifting plate can be detachably connected. The lifting screw includes a threaded section and a non-threaded section. The outer diameter of the threaded section is larger than that of the non-threaded section, and the threaded section mates with the threaded through hole of the boss on the lifting plate. The non-threaded section is inserted into the positioning hole of the positioning plate.

[0007] Furthermore, the positioning structure includes a screw, a positioning block, and a nut. One end of the screw is connected to the annular surface of the upper cover, and the other end extends in a direction away from the annular surface. The positioning block is sleeved on the screw through its own through hole. At least one surface of the positioning block is in close contact with the part housing. The nut is sleeved on the screw and in close contact with the surface of the positioning block.

[0008] Furthermore, the positioning structure consists of three sets. The surfaces of the positioning blocks that are in close contact with the part housing and the lower surfaces of the top cover that are in close contact with the part housing together fix the upper protective device on the part housing above the spraying surface.

[0009] Furthermore, the positioning block includes a cylinder and a cuboid, one end of which is connected to the cylindrical surface of the cylinder, and a through hole coaxial with the cylinder is formed on the cylinder.

[0010] Furthermore, the lower end protection device also includes, A protrusion located on the movable plate, the protrusion having a threaded hole; The fixing ring is circular and has a connecting hole on its surface. When the movable plate is pressed against the surface of the boss of the lifting plate through the protrusion, the fixing ring is sleeved on the outside of the protrusion so that the protrusion and the boss are both located inside it. A screw that passes through a connecting hole on a retaining ring and whose end is pressed against the surface of a boss.

[0011] Furthermore, the movable plate consists of three pieces, each of which is a sector-shaped structure with a central angle of 120°.

[0012] A method for protecting the non-painted surface of a component housing using the aforementioned component housing painting apparatus includes, The upper protective device is placed into the part housing from above the sprayed surface. The upper protective device is fastened to the part housing by the positioning structure, so that the annular surface and the frustum surface of the upper cover completely cover all non-sprayed surface areas above the sprayed surface, including the conical cylinder structure. Place the positioning plate and lifting plate from the lower protection device into the part housing one by one from above the spraying surface until the lower end face of the positioning plate is tightly against the inner ring of the V-shaped cross-section annular cavity structure, and the lifting plate is tightly against the upper end face of the positioning plate. Insert the movable plates one by one from above the spraying surface at an angle until the movable plates are placed on the surface of the lifting plate. Then connect all the movable plates with the bosses of the lifting plate to form a complete circle. Next, insert the lifting screw into the threaded through hole of the boss and the positioning hole of the positioning plate in sequence. Finally, rotate the lifting screw to drive the lifting plate to move the movable plates away from the upper end face of the positioning plate and finally tightly against the lower end of the spraying surface, so as to achieve full coverage of all non-spraying surface areas below the spraying surface, including the opening of the V-shaped cross-section annular cavity structure.

[0013] Compared with the prior art, the spraying apparatus and protection method for non-sprayed surfaces in this invention have the following characteristics: (1) The present invention solves the problem that a protective circular plate larger than the inner diameter of the spraying surface cannot freely enter and exit the spraying surface by dividing the movable plate into multiple fan-shaped plates and then placing them one by one between the spraying surface and the V-shaped cross-section annular cavity structure.

[0014] (2) The present invention makes full use of the limited height of the opening of the V-shaped cross-section annular cavity structure in the part casing. It adopts the principle of reverse pushing between threads. A positioning plate and a lifting plate move and fix the movable plate in the narrow space of the opening of the V-shaped cross-section annular cavity structure, so that the movable plate can block the opening of the V-shaped cross-section annular cavity structure below the spraying surface, and prevent sandblasting and spraying from affecting the interior of the V-shaped cross-section annular cavity structure through the opening of the V-shaped cross-section annular cavity structure.

[0015] (3) The spraying device of the present invention is simple to implement, easy to manufacture, convenient to operate, and can be recycled.

[0016] (4) Since the positioning plate, lifting plate and movable plate are all rigid structures, the combination of the three forms a rigid protective structure between the sprayed surface and the non-sprayed surface, which can withstand a large sandblasting and spraying impact.

[0017] (5) By adopting the spraying device and protection method of the present invention, the working efficiency of sandblasting and spraying of the parts casing is improved, and the non-sprayed surface is fully protected and shielded, greatly shortening or even eliminating the time for cleaning dust. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the component housing in this invention; Figure 2 A schematic diagram of the component housing for assembling the spraying device; Figure 3 This is a schematic diagram of the upper protection device structure; Figure 4 This is a schematic diagram of the lower protection device structure; Figure 5 A simplified diagram showing the spatial relationship between the sprayed surface, the conical cylinder, and the V-shaped cross-section annular cavity structure; In the diagram, 1-upper protection device, 2-lower protection device, 11-upper cover, 12-screw, 13-positioning block, 14-nut, 21-positioning plate, 22-lifting plate, 23-moving plate, 24-fixing ring, 25-lifting screw, 26-screw. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0020] To address the protection issue of non-sprayed surfaces, this invention involves inserting a large disc, larger than the inner diameter of the sprayed surface inlet, into the opening of a V-shaped cross-section annular cavity structure below the sprayed surface. The large disc is positioned flush against the lower end of the sprayed surface, thus sealing the opening of the V-shaped cross-section annular cavity structure and shielding it from spraying and sandblasting. This prevents spraying and sandblasting from affecting the inner cavity of the V-shaped cross-section annular cavity structure. Furthermore, a cap is placed on the upper part of the sprayed surface to protect areas that do not require spraying. Based on this approach, this invention designs a... Figure 2 The spraying device shown is mounted on the part housing.

[0021] like Figure 3 and Figure 4 The part casing spraying device mainly consists of two parts: the upper protection device 1 and the lower protection device 2.

[0022] The three-dimensional sectional view of the upper protection device 1 is shown below. Figure 3 As shown, it mainly consists of an upper cover 11, a screw 12, a positioning block 13, and a nut 14. The upper cover is constructed by welding an annular surface and a frustum, and its function is to isolate the non-painted area at the upper part of the painted surface. The positioning block 13 and the nut 14 can be moved to the corresponding height position on the screw 12, and together with the annular surface of the upper cover 11, they fasten the upper protective device 1 to the upper part of the painted surface of the part housing.

[0023] The three-dimensional sectional view of the lower end protection device 2 is shown below. Figure 4As shown, it mainly consists of a positioning plate 21, a lifting plate 22, three movable plates 23, a fixing ring 24, a lifting screw 25, and screws 26. The maximum outer diameter of the positioning plate 21 and the lifting plate 22 is smaller than the inner diameter of the inlet of the spraying surface (cylindrical surface), so that they can freely enter and exit the spraying surface and be placed in the cavity inlet of the V-shaped cross-section annular cavity structure.

[0024] The three movable plates 23, when spliced ​​together, form a complete large disc. Since the diameter of the large disc is larger than the inner diameter of the spray surface inlet, it cannot be placed as a single unit. Instead, it is disassembled into three fan-shaped movable plates 23, each representing one-third of the circumference. These are placed one at a time into the cavity inlet of the V-shaped cross-section annular cavity structure, and then reassembled into a complete large disc, which is placed on the upper surface of the lifting plate 22. The fixing ring 24 is fitted onto the cylindrical steps (protrusions) on the three movable plates 23 corresponding to the center of the large disc. Screws 26 are then tightened, pressing the cylindrical steps firmly against the central protrusion of the lifting plate 22, thus forming the lifting plate 22 and the three movable plates 23 into a single unit.

[0025] The external thread of the lifting screw 25 (cylindrical head hexagonal screw) is screwed into the internal threaded through hole of the boss in the middle of the lifting plate 22 until the small round platform (non-threaded section) at the lower end of the lifting screw 25 is inserted into the positioning hole in the middle of the positioning plate 21. The lower threaded step of the lifting screw 25 (the step formed at the junction of the external threaded section and the non-threaded section due to the difference in outer diameter) locks it onto the positioning plate 21, thus positioning the height of the lifting screw 25 relative to the positioning plate 21. At this time, rotating the lifting screw 25 prevents the positioning plate 21 from moving downwards (it is stuck on the inner ring of the V-shaped cross-section annular cavity structure because the maximum outer diameter of the positioning plate 21 is smaller than the inner diameter of the sprayed surface but larger than the minimum inner diameter of the inner ring of the V-shaped cross-section annular cavity structure). Therefore, the lifting plate 22 and the movable plate 23 can move up and down relative to the positioning plate 21 due to the external thread drive of the lifting screw 25. Figure 5 The space at a height of h shown in the diagram effectively seals the lower end of the sprayed surface, thereby blocking the opening of the V-shaped cross-section annular cavity structure. When the movable plate 23 rises to the lower end of the sprayed surface of the part housing and is in close contact with it, the inner cavity of the lower V-shaped cross-section annular cavity structure of the sprayed surface of the part housing is sealed.

[0026] The upper protective device 1 and lower protective device 2 in the part casing spraying device are assembled according to the following operating principle: First, the upper protection device 1, such as Figure 3 As shown, its main body is composed of a toroidal surface and a frustum, which are welded together. Its size is determined according to the size of the conical cylinder at the upper end of the sprayed surface of the part housing. It is important to note that the lower diameter (smaller diameter end) of the frustum is the same as the inner diameter of the sprayed surface, and the height is the same as the height of the part housing at this position, so as to satisfy the function of sealing the upper end of the sprayed surface.

[0027] The upper protection device 1 is fixed by the screw 12, the positioning block 13, and the nut 14 being snapped back into the middle of the part housing. The positioning block 13 includes a rectangular structure and a cylindrical structure. The rectangular structure is used to snap back into any position of the part housing, while the cylindrical structure is used for the positioning block 13 to move on the screw 12.

[0028] Second, the lower protection device 2, such as Figure 4 As shown, the positioning plate 21 corresponds to the upper end of the truncated cone at the inner ring of the V-shaped cross-section annular cavity structure at the lower part of the spraying surface. Figure 5 The lower part of the height h, the inner ring part of ΦD) fits together. Since the outer diameter of the positioning plate 21 is larger than the inner diameter of the frustum, it cannot move further downward. Therefore, it serves as a reference to position the height of the lifting plate 22. The diameter of the positioning hole at the center of the positioning plate 21 is equal to the lower diameter of the lifting screw 25 + 1.5mm.

[0029] The lifting plate 22, three movable plates 23, and fixing ring 24 are screwed together by three screws 25. The internal thread of the threaded hole on the central boss of the lifting plate 22 and the external thread of the lifting screw 25 rotate with each other, which can adjust the lifting height of the lifting plate 22. When it rises to the frustum position at the lower end of the spraying surface, the lower end of the spraying surface can be closed (corresponding to...). Figure 5 The upper part of the middle height h, the outer ring part of ΦC).

[0030] The internal thread of the boss in the middle of the lifting plate 22 is matched with the external thread of the lifting screw 25. The outer diameter of the boss + 1mm, after being combined with the movable plate 23, forms a surrounding surface that is equal to the outer diameter of the boss. The outer diameter of the protrusion after the three movable plates 23 are combined + 1mm is equal to the inner diameter of the fixing ring 24.

[0031] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A device for spraying paint on a parts housing, wherein the parts housing includes a cylindrical spraying surface, one axial end face of the spraying surface is connected to a conical cylinder structure, and the other axial end face of the spraying surface is connected to a V-shaped cross-section annular cavity structure, characterized in that: The spraying device includes an upper protective device (1) and a lower protective device (2), wherein: The upper protective device (1) includes an annular surface and a frustum surface. The annular surface and the frustum surface are coaxial. The inner ring of the annular surface is connected to the large diameter end face of the frustum surface to form an upper cover (11). The inner diameter of the small diameter end of the frustum surface is equal to the inner diameter of the spraying surface. A positioning structure is also connected to the annular surface. The positioning structure extends toward the small diameter end face of the conical surface and is connected to the part housing. The lower end protection device (2) includes a positioning plate (21), a lifting plate (22), a movable plate (23), and a lifting screw (25), wherein: The maximum outer diameter of the positioning plate (21) and the lifting plate (22) is smaller than the inner diameter of the sprayed surface but larger than the minimum inner diameter of the inner ring of the V-shaped cross-section annular cavity structure. The positioning plate (21) has a positioning hole and the lifting plate (22) has a boss with a threaded through hole. The movable plate (23) has a fan-shaped structure. Multiple movable plates (23) are spliced ​​together to form a complete circle, and the diameter of the circle is larger than the inner diameter of the spraying surface. The movable plate (23) and the boss on the lifting plate (22) are detachably connected. The lifting screw (25) includes a threaded section and a non-threaded section. The outer diameter of the threaded section is larger than that of the non-threaded section. The threaded section is engaged with the threaded through hole of the boss on the lifting plate (22). The non-threaded section is inserted into the positioning hole of the positioning plate (21).

2. The device for spraying paint on a parts housing according to claim 1, characterized in that: The positioning structure includes a screw (12), a positioning block (13), and a nut (14). One end of the screw (12) is connected to the annular surface of the upper cover (11), and the other end extends in a direction away from the annular surface. The positioning block (13) is sleeved on the screw (12) through its own through hole. At least one surface of the positioning block (13) is in close contact with the part housing. The nut (14) is sleeved on the screw (12) and in close contact with the surface of the positioning block (13).

3. The device for spraying paint on a parts housing according to claim 2, characterized in that: The positioning structure has three sets. The positioning block (13) and the surface of the part housing that are in close contact with each other, as well as the upper cover (11) and the lower surface of the part housing that are in close contact with each other, together fix the upper protection device (1) on the part housing above the spraying surface.

4. The device for spraying paint on a parts housing according to claim 2, characterized in that: The positioning block (13) includes a cylinder and a cuboid. One end of the cuboid is connected to the cylindrical surface of the cylinder, and a through hole coaxial with the cylinder is opened on the cylinder.

5. The device for spraying paint on a parts housing according to claim 1, characterized in that: The lower end protection device (2) also includes, The protrusion is located on the movable plate (23) and has a threaded hole. The fixing ring (24) is annular and has a connecting hole on its surface. When the movable plate (23) is pressed against the boss surface of the lifting plate (22) through the protrusion, the fixing ring (24) is sleeved on the outside of the protrusion so that the protrusion and the boss are located inside it at the same time. Screw (26) passes through the connecting hole on the retaining ring (24) and its end is pressed against the surface of the boss.

6. The apparatus for spraying paint on a parts housing according to claim 1, characterized in that: There are three movable plates (23), each of which is a sector-shaped structure with a central angle of 120°.

7. A method for protecting the non-painted surface of a component housing using the component housing spraying apparatus of claim 1, characterized in that: include, The upper protective device (1) is placed into the part housing from above the sprayed surface. The upper protective device (1) is fastened to the part housing by the positioning structure, and the annular surface and the frustum surface of the upper cover (11) completely cover all non-sprayed surface areas above the sprayed surface, including the conical structure. Place the positioning plate (21) and lifting plate (22) in the lower protection device (2) into the part housing from above the spraying surface until the lower end face of the positioning plate (21) is close to the inner ring of the V-shaped cross-section annular cavity structure and the lifting plate (22) is close to the upper end face of the positioning plate (21). Insert the movable plate (23) one by one from above the spraying surface until the movable plate (23) is placed on the surface of the lifting plate (22). Then connect all the movable plates (23) with the boss of the lifting plate (22) to form a complete circle. Then insert the lifting screw (25) into the threaded through hole of the boss and the positioning hole of the positioning plate (21) in sequence. Finally, rotate the lifting screw (25) to drive the lifting plate (22) and the movable plate (23) away from the upper end face of the positioning plate (21) and finally close to the lower end of the spraying surface, so as to fully cover all non-spraying surface areas below the spraying surface, including the opening of the V-shaped cross-section annular cavity structure.

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