A sandblasting masking jig

Abstract

The utility model discloses a sandblasting shielding jig, including fixed platform and placing piece, and placing piece has the exposed area of the hinged joint of panel and side wall of shell and can completely shield the chamfer area of notebook computer shell's shielding area, and the shielding area has the cooperation of the disassembly of fixed platform and the cooperation part, and the chamfer area of shell is inserted in the accommodation part of the accommodation, and the interval between accommodation part and fixed platform is greater than the thickness of shell chamfer area, and the side of placing piece towards exposed area has the guide structure of sand material introduction in the accommodation part compared with prior art, and the chamfer area of notebook computer shell can be shielded by shielding area, prevents the sand material direct injection in chamfer area position when carrying out the injection of panel, prevents the excessive sand material stress accumulation in chamfer area and causes the deformation of chamfer area, guarantees sandblasting quality.

Description

Technical Field

[0001] This utility model relates to the field of sandblasting technology, and in particular to a sandblasting masking fixture. Background Technology

[0002] Sandblasting is a process that uses the impact of a high-speed abrasive stream to clean and roughen the surface of a substrate. Powered by compressed air, a high-speed jet propels abrasive materials (copper ore sand, quartz sand, corundum, iron sand, Hainan sand) onto the surface of the workpiece. This alters the workpiece's surface or shape. Due to the impact and cutting action of the abrasive on the workpiece surface, it achieves a certain degree of cleanliness and varying roughness, improving the mechanical properties of the workpiece surface. This enhances the workpiece's fatigue resistance, increases adhesion to coatings, extends coating durability, and also facilitates coating leveling and decoration. Sandblasting is a standard process for laptop casings. Sandblasting achieves a clean surface on laptop casings. During surface treatment, sandblasting is required according to design requirements. Currently, there are various types of sandblasting equipment on the market. For example, a sandblasting device for laptop casings (application number 2023110382270) includes a frame. A worktable with an inlet is slidably connected to the frame via a drive mechanism. A drying chamber covering the inlet is located at the bottom of the worktable. A scraping device corresponding to the inlet is slidably mounted on the worktable. An inclined rail corresponding to the scraping device is fixedly mounted on the frame. The scraping device is connected to the inclined rail via a sliding plate. The scraping device includes a scraper that slides against the top surface of the worktable. During sandblasting, the inclined track drives the worktable to slide back and forth along the inlet direction, pushing the sand through the inlet and into the drying chamber. There are two inlets and two scraping devices, each corresponding to a different inlet. A fixed platform for placing the housing is fixed on the worktable. The fixed platform is located between the two inlets, which are located between the upper halves of two sliding members. The upper halves of the sliding members extend above the worktable to block the sprayed sand, causing it to fall between the upper halves of the two sliding members. The shape of the fixed platform is adapted to the concave shape of the housing, or suction holes are added to the fixed platform to adsorb the housing and improve its stability. In application, the laptop housing is placed on the fixed platform, and the surface of the housing is sandblasted by spraying sand through the nozzle.

[0003] The laptop casing has a front panel and side panels on all four sides of the front panel. One side panel has a recessed hinge interface, with the side panel having the hinge interface being the hinge side and the other three side panels being non-hinge sides. The parts of the side panels on both sides of the hinge interface on the non-hinge sides and the hinge side have an arc-shaped chamfered structure, forming a chamfered area. The formation of this chamfered area makes the thickness of the side panel at the chamfered area thinner than the thickness of the front panel. Since the thickness of the sand sprayed on the laptop casing is uniform, when the nozzle sandblasts the entire casing, it often deforms due to the stress caused by the thicker sand spray when the side panel chamfered area is thinner, resulting in poor sandblasting quality.

[0004] In view of this, the inventors of this case conducted in-depth research on the problem, which led to the creation of this case. Utility Model Content

[0005] The purpose of this invention is to provide a sandblasting masking fixture to solve the problem that stress release occurs on the periphery of existing laptop casings, making precise assembly with other components impossible.

[0006] To achieve its purpose, this utility model adopts the following technical solution:

[0007] A sandblasting masking fixture includes a fixed platform for placing a laptop computer casing, and a placement member movably placed on the fixed platform. The placement member has an exposed area for completely exposing the hinge interfaces of the casing's panel and side panels, and a masking area for completely masking the chamfered area of ​​the laptop computer casing. The masking area has a mating part that detachably overlaps with the fixed platform and a receiving part for the chamfered area of ​​the casing to extend into the receiving part. The distance between the receiving part and the fixed platform is greater than the thickness of the chamfered area of ​​the casing, and the side of the placement member facing the exposed area has a guide structure at the receiving part for introducing sand into the receiving part.

[0008] The placement component has a first shielding strip and a second shielding strip. There are two first shielding strips, which are arranged laterally opposite each other. The second shielding strip is located outside one end of the two first shielding strips. The two first shielding strips and the second shielding strip form a square space with one side open. With the opening of the square space as the front, this square space is the exposed area.

[0009] The first shielding strip has an inner guide section and an outer mating section connected together. Both the inner guide section and the outer mating section extend in the front-to-back direction. The two inner guide sections are located between the two outer mating sections. The two outer mating sections and the third shielding strip are suspended and locked onto the fixed platform by a lifting structure. The second shielding strip extends in the left-to-right direction at the rear end of the two inner guide sections, and the rear side of the inner guide section contacts the front side of the second shielding strip. The guiding structure is located on the side of the second shielding strip and the two inner guide sections facing the square space.

[0010] The inner guide section and the outer mating section are arranged opposite each other on the left and right. The top surface of the inner guide section and the top surface of the outer mating section are respectively connected to an inner locking plate and an outer locking plate extending in the front-back direction. The top surfaces of the inner locking plate and the outer locking plate are connected together by an adjustment plate in a way that allows for left-right relative interval adjustment. Both outer locking plates are locked together with two second shielding strips by connecting blocks. The bottom surfaces of the outer mating section and the second shielding strip are both recessed with lifting grooves. The top surface of the fixing platform is provided with a lifting column embedded in the lifting groove at the position corresponding to the lifting groove. The vertical distance between the top surface of the fixing platform and the top surface of the lifting column is greater than the groove depth of the lifting groove. The bottom surfaces of the inner guide section and the outer mating section are flush. The lifting groove and the lifting column are the above-mentioned lifting structure. The bottom surfaces of the two first shielding strips and the bottom surface of one second shielding strip are formed with the top surface of the fixing platform to form an accommodating space for accommodating the laptop shell. This accommodating space is the above-mentioned accommodating part. The height of the accommodating space in the vertical direction is greater than the thickness of the chamfered area.

[0011] The outer locking plate has a fixing block protruding outward on the side opposite to the inner locking plate. The bottom surface of the fixing block is locked with a mating block. The outer side of the fixing platform is recessed at the position of the mating block for the mating block to be embedded in. The two mating blocks are the aforementioned mating parts.

[0012] The inner guide section has a downward sloping surface on the side facing the square space, and the two sloping surfaces enclose a flared space that gradually expands from top to bottom. The front side of the second shielding strip has a convex arc surface and a forward-sloping surface. The convex arc surface is a convex arc structure that bulges forward, and the forward-sloping surface is located below the convex arc surface. The forward-sloping surface is set from top to bottom and then backward. The convex arc surface, the forward-sloping surface, and the two sloping surfaces constitute the above-mentioned guide structure.

[0013] The top surface of the second shielding strip is provided with a shielding strip that can move toward or away from the center of the square space. The shielding strip falls into the area above the square space and is horizontally arranged in the left-right direction.

[0014] The fixed platform has a first base plate, a second base plate and a third base plate from bottom to top. The mounting groove is located on the left and right sides of the third base plate. The first base plate and the second base plate are both recessed with through holes at the position of the mating block, allowing the mating block to be embedded in them and passing through from top to bottom.

[0015] An extension block is provided on the top surface of the third base plate, on the rear side of the first shielding strip, which is locked onto the third base plate and contacts the side of the second shielding strip. The vertical cross-sectional structure of the extension block is the same as the vertical cross-section of the first shielding strip.

[0016] The first base plate is a bakelite board, and the second base plate is a polyurethane board.

[0017] This novel sandblasting masking fixture is used by first picking up the entire placement piece, aligning and mounting the laptop casing on a fixed platform, then stacking the placement piece on the fixed platform with the masking area suspended above the laptop casing. Two first masking strips and one second masking strip cover the chamfered area of ​​the laptop casing. Finally, the fixed platform is placed on the sandblasting equipment, and sandblasting is performed using the nozzle. During sandblasting, the nozzle is directed towards the exposed area. Due to the shielding effect of the first and second masking strips, the abrasive is not directly sprayed onto the chamfered area but onto the panel. Simultaneously, the edges of the first and second masking strips create a regular square structure around the abrasive sprayed onto the panel, thus achieving panel sandblasting. With the nozzle directed towards the chamfered area, the abrasive enters the chamfered area under the guidance of the structure, achieving sandblasting of the chamfered area. Compared to existing technologies, the shielding area effectively blocks the chamfered area of ​​the laptop casing, preventing abrasive from being directly sprayed onto the chamfered area during panel blasting. Instead, a guiding structure slowly guides the abrasive into the chamfered area, preventing excessive abrasive stress buildup that could cause deformation and ensuring laptop quality. Furthermore, since the height between the chamfered area and the bottom surfaces of the first and second shielding strips is fixed, the amount of abrasive entering the chamfered area is limited, preventing excessive abrasive from falling onto the chamfered area and further preventing stress buildup and deformation, thus ensuring sandblasting quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is another structural schematic diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the fixing platform of this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the second shielding strip of this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the first shielding strip of this utility model. Detailed Implementation

[0023] To further explain the technical solution of this utility model, a detailed description is provided below in conjunction with the accompanying drawings.

[0024] A sandblasting masking fixture, such as Figures 1-5As shown, the device includes a fixed platform 1 on which a laptop casing is placed, and a placement component movably placed on the fixed platform 1. The placement component has an exposed area that completely exposes the hinge joints of the laptop casing's panel and side panels, and a covered area that completely covers the chamfered areas of the laptop casing. Specifically, the placement component has a first covering strip 2 and a second covering strip 3, and both the first covering strip 2 and the second covering strip 3 are made of urethane rubber to prevent damage to the laptop casing. The first covering strip extends in the front-to-back direction, and the second covering strip 3 is horizontally arranged in the left-to-right direction. There are two first covering strips 2, which are horizontally spaced apart from each other. The second covering strip 3 is located outside the rear end of the two first covering strips 2. The two first covering strips 2 and one second covering strip 3 form a square space with one side open, which is the exposed area. During processing, the nozzle is positioned above the exposed area. The abrasive sprayed from the nozzle falls from the exposed area onto the top surface of the laptop casing. Under the shielding effect of the two first shielding strips 2 and one second shielding strip 3, the abrasive will not be directly sprayed onto the chamfered area of ​​the laptop casing. Moreover, the abrasive sprayed onto the laptop casing panel can form a regular rectangular structure, achieving sandblasting of the panel area and also dividing the sandblasting of the panel and chamfered area into zones.

[0025] The shielding area has a mating part that detaches and overlaps with the fixing platform 1, and a receiving part into which the chamfered area of ​​the housing extends. The distance between the receiving part and the fixing platform 1 is greater than the thickness of the chamfered area of ​​the housing. Specifically, the first shielding strip 2 has an inner guide section 21 and an outer mating section 22 connected together. Both the inner guide section 21 and the outer mating section 22 extend in the front-rear direction. The two inner guide sections 21 are located between the two outer mating sections 22. The two outer mating sections 22 and the second shielding strip 3 are connected together, and the entire placement piece is suspended and engaged on the fixing platform 1. The second shielding strip 3. Extending in the left-right direction, it is located at the rear end of the two inner guide sections 21. The bottom surface of the first shielding strip 2 and the bottom surface of the second shielding strip 3 are flush, and the rear side of the inner guide section 21 contacts the front side of the second shielding strip 3. That is, the inner guide section 21 and the outer mating section 22 are arranged opposite each other in the left and right direction. The top surface of the inner guide section 21 and the top surface of the outer mating section 22 are respectively locked with an inner locking plate 41 and an outer locking plate 42 extending in the front-back direction. That is, the top surface of the inner guide section 21 is recessed with a connecting groove, and the inner locking plate 41 is recessed with a connecting hole corresponding to the position of the connecting groove. The fixing plate 41 is connected to the inner guide section 21 by connecting bolts passing through the connecting hole into the connecting groove. The locking method of the outer locking plate 42 and the outer mating section 22 is similar to that of the inner locking plate 41 and the inner guide section 21. The top surface of the inner locking plate 41 and the top surface of the outer locking plate 42 are connected together by adjusting plate 43. Both outer locking plates 42 are locked together with the second shielding strip 3 by connecting block 421. That is, the connecting block 421 is inclined and the two connecting blocks 421 form a flared structure that gradually narrows from front to back. The top surface of the second shielding strip 3 is locked together. The connecting plate 31 has its rear ends locked to the left and right ends of the two connecting blocks 421, respectively. The front ends of the two connecting blocks 421 are locked to the rear ends of the two outer locking plates 42, respectively. The top surface of the outer locking plate 42 has a handle 422 for gripping. The side of the outer locking plate 42 facing away from the inner locking plate 41 has a protruding fixing block 5. The bottom surface of the fixing block 5 has a mating block 51. The outer side of the fixing platform 1 has a recessed groove for the mating block 51 to be inserted at the position of the mating block 51. The two mating blocks 51 are the mating parts mentioned above. In use, the inner locking plate 41, outer locking plate 42, adjusting plate 43, connecting plate 31, handle 422, mating block 51, handle 422, inner guide section 21 and outer mating section 22 are integrally connected to form a placement piece. The entire placement piece is picked up, and a laptop casing is placed on the fixing platform 1. The mating block 51 is aligned with the insertion groove to achieve the alignment of the placement piece with the solid platform 1. Furthermore, all components of the entire mounting device can be disassembled and connected, allowing the length and width of the device to be adjusted according to the different sizes of the laptop casing.

[0026] The two outer mating sections 22 and the second shielding strip 3 are suspended and locked onto the fixed platform 1 by a lifting structure. Specifically, the bottom surfaces of the outer mating sections 22 and the second shielding strip 3 are both recessed with lifting grooves. That is, the front end of the bottom surface of the outer mating section 22 is recessed with the aforementioned lifting groove, and the left and right ends of the bottom surface of the second shielding strip 3 are recessed with the aforementioned lifting groove. The four lifting grooves form a hollow square space. Openings for fixed connection are provided at the four corners of the laptop casing, and the openings are corresponding to the lifting grooves. The top surface of the fixed platform 1 is provided with a structure at the position of the lifting groove. The lifting post 6, embedded in the lifting groove, has an insertion groove recessed at the position of the top surface of the fixing platform where it is located. The lifting post 6 is fitted and locked in the insertion groove, and the vertical distance between the top surface of the fixing platform 1 and the top surface of the lifting post 6 is greater than the depth of the lifting groove. The lifting groove and the lifting post 6 constitute the lifting structure described above. A receiving space is formed between the bottom surfaces of the two first shielding strips 2 and the bottom surface of the second shielding strip 3 and the top surface of the fixing platform 1, which is the receiving part described above. The height of the receiving space in the vertical direction is greater than the thickness of the chamfered area. In application, the opening of the laptop casing is aligned with the lifting post 6, and the lifting post 6 is inserted into the lifting groove accordingly. The lifting post 6 causes the first shielding strips 2 and the second shielding strip 3 to suspend on the top surface of the fixing platform 1. The two first shielding strips 2 and the second shielding strip 3 cover the chamfered area of ​​the laptop casing, and the laptop casing is stacked within the receiving space. Furthermore, the lifting column 6 and the fixed platform 1 can be disassembled and fitted together, making it convenient to replace the lifting column 6 and control the height of the accommodating space.

[0027] The placement component has a guide structure for introducing sand into the receiving part on the side facing the exposed area. The guide structure is located on the side of the second shielding strip 3 and the two inner guide sections 21 facing the square space. Specifically, the side of the inner guide section 21 facing the square space is an inclined surface 71 that slopes downward from the inside to the outside, and the two inclined surfaces 71 enclose a funnel-shaped space that gradually expands from top to bottom. The front side of the second shielding strip 3 has a convex arc surface 72 and a forward-leaning surface 73. The convex arc surface 72 is a convex arc structure that convexes forward, and the forward-leaning surface 73 is located below the convex arc surface 72. The forward-leaning surface 73 is inclined from top to bottom and backward. The convex arc surface 72, the forward-leaning surface 73 and the two inclined surfaces 71 constitute the above-mentioned guide structure. When in use, the nozzle is tilted towards the chamfered area to spray sand. Under the guidance of the guide structure, the sand flows into the receiving space and completes the sandblasting of the chamfered area. Since the height of the receiving space is fixed, not too much sand will be sprayed at the chamfered area, so there will be no excessive stress accumulation in the chamfered area, and the chamfered area will not easily deform.

[0028] This novel sandblasting masking fixture is used by gripping the handle, lifting the entire placement piece, aligning the laptop casing onto the fixing platform 1, then inserting the two mating blocks 51 of the placement piece into the two corresponding mounting slots, and inserting the lifting column 6 into the corresponding lifting slot. Under the action of the lifting column 6, the first masking strip 2 and the second masking strip 3 are suspended above the laptop casing, and the two first masking strips 2 and one second masking strip 3 cover the chamfered area of ​​the laptop casing. Finally, the fixing platform is lifted and placed on the sandblasting equipment, and sandblasting is performed using the nozzle. During sandblasting, the nozzle is directed towards the exposed area. Under the shielding effect of the first masking strips 2 and the second masking strips 3, the abrasive is not directly sprayed onto the chamfered area, but onto the panel. At the same time, under the shielding effect of the edges of the first masking strips 2 and the second masking strips 3, the abrasive sprayed onto the panel forms a regular square structure around its periphery, thereby achieving panel sandblasting. With the nozzle directed towards the chamfered area, the abrasive enters the chamfered area under the action of the guiding structure, achieving chamfered area sandblasting. Compared to existing technologies, the shielding area effectively blocks the chamfered area of ​​the laptop casing, preventing abrasive from being directly sprayed onto the chamfered area during panel blasting. Instead, a guiding structure slowly guides the abrasive into the chamfered area, preventing excessive abrasive stress buildup that could cause deformation and ensuring laptop quality. Furthermore, since the height between the chamfered area and the bottom surfaces of the first and second shielding strips is fixed, the amount of abrasive entering the chamfered area is limited, preventing excessive abrasive from falling onto the chamfered area and further preventing stress buildup and deformation, thus ensuring sandblasting quality.

[0029] In this invention, preferably, the top surfaces of the inner locking plate 41 and the outer locking plate 42 are connected together by an adjusting plate 43 in a manner that allows for left-right relative adjustment. That is, the adjusting plate 43 is horizontally arranged on the top surfaces of the inner locking plate 41 and the outer locking plate 42 in the left-right direction. Several adjusting plates are provided, and each adjusting plate 43 is spaced apart in the front-back direction. One end of the adjusting plate 43 is integrally connected to the inner locking plate 41, and the adjusting plate 43 has a strip-shaped through hole that runs vertically through and extends in the left-right direction. The other end of the strip-shaped through hole is located above the outer locking plate 42, and the outer locking plate 42 has a locking hole recessed at the position corresponding to the position of the strip-shaped through hole. The adjusting plate 43 is detachably connected to the outer locking plate 42 by passing a locking bolt 431 through the strip-shaped through hole into the locking hole. In application, the distance between the inner guide section 21 and the outer mating section 22 is adjusted according to the length of the laptop casing, and then the locking bolt 431 is tightened to achieve the connection between the inner guide section 21 and the outer mating section 22. The distance between the inner guide section 21 and the outer mating section 22 can be adjusted relative to each other, which is beneficial to adjust the length of the shielding area according to the different lengths of the laptop casing.

[0030] In this novel invention, the top surface of the second shielding strip 3 is provided with a shielding strip 8 that can move towards or away from the center of the square space. The shielding strip 8 falls within the area above the rear end of the square space and is horizontally positioned in the left-right direction. Specifically, a movable plate 311 is stacked on the top surface of the connecting plate 31. The top surface of the connecting plate 31 is recessed with a fixing hole. The movable plate 311 has a vertically penetrating adjustment through hole at the position of the fixing hole. The adjustment through hole is a strip-shaped structure extending in the front-back direction. The movable plate 311 is fixed to the connecting plate 31 by a fixing bolt passing through the adjustment through hole into the fixing hole. The shielding strip 8 is fixed to the front side of the movable plate 311, and the front side of the shielding strip 8 is a cutting plane extending in the left-right direction. In application, when the nozzle sprays sand into the exposed area, under the shielding effect of the shielding strip 8, the sand on the back side of the laptop casing panel can be in a straight line structure, dividing the panel and chamfered area and ensuring the spraying quality. Furthermore, the shielding strip 8 can be adjusted forward and backward to accommodate different laptop casing sizes.

[0031] In this invention, preferably, the fixed platform 1 comprises, from bottom to top, a first base plate 11, a second base plate 12, and a third base plate 13 locked together. The first base plate 11 is made of bakelite board, and the second base plate 12 is made of urethane board. The mounting grooves are located on the left and right sides of the third base plate 13. The bottom surface of the first base plate is provided with a positioning structure for mounting on a sandblasting device. The specific structure of the positioning structure is adjusted according to the placement position of the sandblasting device. For example, if the placement position of the sandblasting device has a positioning groove, then a positioning post is provided on the bottom surface of the first base plate. The positioning post and the positioning groove constitute the aforementioned positioning structure. Both the first base plate 11 and the second base plate 12 are recessed with through holes at the positions of the mating block 51, allowing the mating block 51 to be embedded and extending vertically. In application, the through holes allow the mating block to be positioned and mounted on the fixed platform 1 according to the different heights of the lifting post 6.

[0032] In this novel design, an advantageous feature is that an extension block 131, locked to the third base plate 13 and in contact with the side of the second shielding strip 3, is provided on the top surface of the third base plate 13, behind the first shielding strip 2. The vertical cross-sectional structure of the extension block 131 is identical to the vertical cross-section of the outer mating section 22. In application, the length of the first shielding strip 2 can be increased according to the different front-to-back widths of the laptop casing to achieve the shielding effect.

[0033] The product form of this utility model is not limited to the illustrations and embodiments in this case. Any appropriate changes or modifications made to it based on similar ideas should be considered as not departing from the patent scope of this utility model.

Claims

1. A sandblasting masking fixture, comprising a fixed platform for placing a laptop computer casing, characterized in that: It also includes a placement component that is movably placed on a fixed platform. The placement component has an exposed area that completely exposes the hinge interfaces of the panel and side panels of the housing, and a shielding area that completely shields the chamfered area of ​​the laptop housing. The shielding area has a mating part that detaches and overlaps with the fixed platform, and a receiving part that allows the chamfered area of ​​the housing to extend into the inner compartment. The distance between the receiving part and the fixed platform is greater than the thickness of the chamfered area of ​​the housing, and the side of the placement component facing the exposed area has a guide structure at the receiving part for introducing sand into the receiving part.

2. The sandblasting masking fixture according to claim 1, characterized in that: The placement component has a first shielding strip and a second shielding strip. There are two first shielding strips, which are arranged laterally opposite each other. The second shielding strip is located outside one end of the two first shielding strips. The two first shielding strips and the second shielding strip form a square space with one side open. With the opening of the square space as the front, this square space is the exposed area.

3. The sandblasting masking fixture according to claim 2, characterized in that: The first shielding strip has an inner guide section and an outer mating section connected together. Both the inner guide section and the outer mating section extend in the front-to-back direction. The two inner guide sections are located between the two outer mating sections. The two outer mating sections and the third shielding strip are suspended and locked onto the fixed platform by a lifting structure. The second shielding strip extends in the left-to-right direction at the rear end of the two inner guide sections, and the rear side of the inner guide section contacts the front side of the second shielding strip. The guiding structure is located on the side of the second shielding strip and the two inner guide sections facing the square space.

4. The sandblasting masking fixture according to claim 3, characterized in that: The inner guide section and the outer mating section are arranged opposite each other on the left and right. The top surface of the inner guide section and the top surface of the outer mating section are respectively connected to an inner locking plate and an outer locking plate extending in the front-back direction. The top surfaces of the inner locking plate and the outer locking plate are connected together by an adjustment plate in a way that allows for left-right relative interval adjustment. Both outer locking plates are locked together with two second shielding strips by connecting blocks. The bottom surfaces of the outer mating section and the second shielding strip are both recessed with lifting grooves. The top surface of the fixing platform is provided with a lifting column embedded in the lifting groove at the position corresponding to the lifting groove. The vertical distance between the top surface of the fixing platform and the top surface of the lifting column is greater than the groove depth of the lifting groove. The bottom surfaces of the inner guide section and the outer mating section are flush. The lifting groove and the lifting column are the above-mentioned lifting structure. The bottom surfaces of the two first shielding strips and the bottom surface of one second shielding strip are formed with the top surface of the fixing platform to form an accommodating space for accommodating the laptop shell. This accommodating space is the above-mentioned accommodating part. The height of the accommodating space in the vertical direction is greater than the thickness of the chamfered area.

5. A sandblasting masking fixture according to claim 4, characterized in that: The outer locking plate has a fixing block protruding outward on the side opposite to the inner locking plate. The bottom surface of the fixing block is locked with a mating block. The outer side of the fixing platform is recessed at the position of the mating block for the mating block to be embedded in. The two mating blocks are the aforementioned mating parts.

6. A sandblasting masking fixture according to claim 3, characterized in that: The inner guide section has a downward sloping surface on the side facing the square space, and the two sloping surfaces enclose a flared space that gradually expands from top to bottom. The front side of the second shielding strip has a convex arc surface and a forward-sloping surface. The convex arc surface is a convex arc structure that bulges forward, and the forward-sloping surface is located below the convex arc surface. The forward-sloping surface is set from top to bottom and then backward. The convex arc surface, the forward-sloping surface, and the two sloping surfaces constitute the above-mentioned guide structure.

7. A sandblasting masking fixture according to claim 2, characterized in that: The top surface of the second shielding strip is provided with a shielding strip that can move toward or away from the center of the square space. The shielding strip falls into the area above the square space and is horizontally arranged in the left-right direction.

8. A sandblasting masking fixture according to claim 5, characterized in that: The fixed platform has a first base plate, a second base plate and a third base plate from bottom to top. The mounting groove is located on the left and right sides of the third base plate. The first base plate and the second base plate are both recessed with through holes at the position of the mating block, allowing the mating block to be embedded in them and passing through from top to bottom.

9. A sandblasting masking fixture according to claim 8, characterized in that: An extension block is provided on the top surface of the third base plate, on the rear side of the first shielding strip, which is locked onto the third base plate and contacts the side of the second shielding strip. The vertical cross-sectional structure of the extension block is the same as the vertical cross-section of the first shielding strip.

10. A sandblasting masking fixture according to claim 8, characterized in that: The first base plate is a bakelite board, and the second base plate is a polyurethane board.

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