Sandblasting masking jig and sandblasting masking method

Abstract

The application relates to the technical field of surface treatment tooling, in particular to a sand blasting shielding jig and a sand blasting shielding method. The sand blasting shielding jig comprises a base, a bottom plate, a cover plate and a lifting positioning mechanism. The bottom plate comprises a plurality of openings penetrating through the bottom plate and is arranged opposite to the base along the penetrating direction of the openings. The cover plate is arranged on the side of the bottom plate away from the base and encloses the bottom plate to form a product containing space communicating with the openings. The cover plate comprises a sand blasting through slot penetrating through the cover plate and communicating with the product containing space. The lifting positioning mechanism is arranged between the base and the bottom plate and comprises a driving assembly mounted on the base and a vertical positioning pin fixed to the side of the driving assembly facing the bottom plate and arranged corresponding to the openings. The driving assembly is configured to drive the vertical positioning pin to penetrate into the openings and extend into or exit from the product containing space. The vertical positioning pin of the jig is liftable, which can realize the positioning function and exit from the product containing space before sand blasting, thereby avoiding contact with the product and eliminating the risk of scratching the product.

Description

Technical Field

[0001] This application relates to the field of surface treatment tooling technology, specifically to a sandblasting masking fixture and a sandblasting masking method. Background Technology

[0002] In the precision manufacturing process of 3C electronic products (such as mobile phones, laptops, and tablets), sandblasting is a core surface treatment process that enhances the product's appearance and texture, and strengthens coating adhesion. For thin-walled shell parts, sandblasting operations require the use of specialized fixtures to precisely mask and protect non-sandblasted areas while ensuring the product's positioning accuracy and avoiding defects such as sandblasting boundary misalignment and surface damage.

[0003] In related technologies, sandblasting fixtures generally use fixed positioning pins to limit the product. This structure has the following technical defects in actual mass production applications, which result in a high risk of secondary damage to the product: the fixed positioning pin is in constant contact with the product throughout the sandblasting process. High-pressure sand particles are very easy to accumulate in the gap between the pin and the product, which can not only cause scratches on the product, but also cause the product to get stuck when it is removed, resulting in surface damage, pitting and other appearance defects.

[0004] Therefore, providing a sandblasting masking fixture to reduce the risk of secondary damage to products has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to provide a sandblasting masking fixture that solves the technical problem of products being easily damaged by fixed positioning pins in the prior art through a lifting positioning scheme.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions: A sandblasting masking fixture includes a base, a base plate, a cover plate, and a lifting and positioning mechanism. The base plate includes multiple openings penetrating the base plate. The base plate and the base are spaced apart relative to each other along the penetrating direction of the openings. The cover plate is located on the side of the base plate away from the base and forms a product receiving space communicating with the openings. The cover plate includes a sandblasting channel penetrating the cover plate and communicating with the product receiving space. The lifting and positioning mechanism is located between the base and the base plate and includes a drive assembly and a vertical positioning pin. The drive assembly is mounted on the base, and the vertical positioning pin is fixed to the side of the drive assembly facing the base plate and corresponding to the openings. The drive assembly is configured to drive the vertical positioning pin to pass through the openings and extend into or out of the product receiving space.

[0007] In some embodiments, a support column is further included between the base and the bottom plate, having a first end and a second end opposite to each other, the first end being mounted on the base and the bottom plate being mounted on the second end.

[0008] In some embodiments, the connecting bracket includes a first plate extending along a first direction perpendicular to the through direction and a second plate extending along a second direction and connected to the first plate, the second direction being perpendicular to both the through direction and the first direction. The projection of the connecting bracket along the through direction is L-shaped, and the first plate and the second plate enclose a clearance space, through which the support column passes. The vertical positioning pin includes a plurality of first vertical positioning pins and a plurality of second vertical positioning pins, the first vertical positioning pins being disposed on the first plate and the second vertical positioning pins being disposed on the second plate.

[0009] In some embodiments, the connecting bracket includes a first plate extending along a first direction perpendicular to the through direction and a second plate extending along a second direction and connected to the first plate, the second direction being perpendicular to both the through direction and the first direction. The projection of the connecting bracket along the through direction is L-shaped, and the first plate and the second plate enclose a clearance space, through which the support column passes. The vertical positioning pin includes a plurality of first vertical positioning pins and a plurality of second vertical positioning pins, the first vertical positioning pins being disposed on the first plate and the second vertical positioning pins being disposed on the second plate.

[0010] In some embodiments, the vertical positioning pin includes a first vertical positioning pin, and the cover plate includes a guide through hole that passes through the cover plate and is correspondingly disposed to the first vertical positioning pin. The guide through hole is used to fit the first vertical positioning pin so as to guide the cover plate to cover the base plate along the extension direction of the vertical positioning pin.

[0011] In some embodiments, the sandblasting masking fixture further includes a side-push positioning mechanism, which includes a second drive member fixed to the base plate on the side facing the base and a lateral positioning pin fixedly connected to the second drive member; the base plate further includes a guide groove corresponding to the lateral positioning pin, the guide groove extending perpendicular to the through direction and communicating with the product receiving space, the second drive member being configured to drive the lateral positioning pin to move closer to or away from the product to be sandblasted along the extension direction of the guide groove, and the product to be sandblasted being placed in the product receiving space.

[0012] In some embodiments, the cover plate further includes a cover plate body and a panel fixedly connected to the cover plate body, the sandblasting channel is provided in the panel, and the panel has a material hardness higher than that of the cover plate body.

[0013] In some embodiments, the cover plate body includes a panel fixedly connected to the panel and an annular retaining wall fixed to the side of the panel facing the base plate and surrounding the periphery of the panel. The annular retaining wall is located at the end of the panel away from the panel and is used to prevent sand particles from flying into non-processing areas.

[0014] In some embodiments, the cover plate body includes a contour-following limiting structure disposed on the side of the cover plate facing the base plate, the contour of the contour-following limiting structure being adapted to the shape of the product to be sandblasted.

[0015] In some embodiments, a plurality of support blocks are also included, which are installed on the side of the base plate facing the product receiving space to support the product to be sandblasted.

[0016] A sandblasting masking method, applied to the aforementioned sandblasting masking fixture, comprising: The drive assembly is controlled to drive the vertical positioning pin through the opening in the base plate and into the product receiving space to position the sandblasted product subsequently placed in the product receiving space. The external drive device is controlled to drive the cover plate to close onto the base plate, thereby fixing the sandblasting product placed in the product receiving space; The drive assembly is controlled to drive the vertical positioning pin out of the product receiving space.

[0017] Compared to related technologies, the sandblasting masking fixture provided in this application provides a liftable design for the vertical positioning pin, which can not only perform the positioning function when the product to be sandblasted is placed, but also actively exit the product receiving space before sandblasting, thereby completely separating it from the product to be sandblasted. This avoids the accumulation of high-pressure sand particles in the gap between the positioning pin and the product, as well as the resulting scratches and pressure damage to the product. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 A three-dimensional assembly diagram of a sandblasting masking fixture provided for an embodiment of this application; Figure 2 yes Figure 1 A schematic diagram showing the open state of the cover plate of the sandblasting masking fixture. Figure 3 for Figure 1 The cross-sectional view of the sandblasting masking fixture shown along line AA; Figure 4 yes Figure 1 An exploded view of the sandblasting shielding fixture shown; Figure 5 for Figure 2 The diagram shows the structure of the cover plate. Figure 6 for Figure 1 A schematic diagram of the three-dimensional assembly structure of the base and the lifting mechanism shown; Figure 7 for Figure 2 The diagram shows a three-dimensional assembly structure of the base, bottom plate, and side-push positioning mechanism.

[0019] The markings in the attached diagram correspond to the following: 1-Base, 2-Base plate, 3-Cover plate, 20-Product receiving space, 21-Opening, 22-Support block, 23-Guide groove, 32-Cover plate body, 33-Instrument, 35-Contour-following limiting structure, 310-Sandblasting channel, 320-Connecting screw hole, 321-Panel, 322-Annular retaining wall. 330 - Guide through hole, 4 - Lifting and positioning mechanism, 41 - Drive assembly, 411 - First drive component, 412 - Connecting bracket, 42 - Vertical positioning pin, 4111 - Dustproof protective shell, 421 - First vertical positioning pin, 422 - Second vertical positioning pin, 4121 - First plate, 4122 - Second plate, 4123 - Clearance space, 6 - Support column, 61 - First end, 62 - Second end, 8 - Side push positioning mechanism, 81 - Second drive component, 82 - Lateral positioning pin, 83 - Rubber sleeve, 84 - Slider, 200 - External drive device interface, 01 - First direction, 02 - Second direction, 03 - Through direction. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0021] In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0022] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0023] Please see Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 This is a three-dimensional assembly diagram of a sandblasting masking fixture provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows the open state of the cover plate of the sandblasting masking fixture. Figure 3 for Figure 1 The image shows a cross-sectional view of the sandblasting masking fixture along line AA. The sandblasting masking fixture 100 provided in this embodiment is used to mask and protect a product to be sandblasted during the sandblasting process. The product to be sandblasted can be a shell-like product, especially a thin-shell product. The sandblasting masking fixture 100 includes a base 1, a base plate 2, a cover plate 3, and a lifting and positioning mechanism 4. The base 1 serves as the mounting base for the entire fixture and is typically fixed to the workbench of the sandblasting equipment. The base plate 2 is positioned opposite and spaced apart from the base 1, forming a space between them to accommodate the lifting and positioning mechanism 4. The cover plate 3 is located on the side of the base plate 2 away from the base 1 and is movably fitted onto the base plate 2, with its fitted state as shown in the image. Figure 1 As shown, the on state is as follows Figure 2 As shown. The cover plate 3 and the base plate 2 enclose a product receiving space 20, which is used to receive the product to be sandblasted. The lifting and positioning mechanism 4 is disposed between the base 1 and the base plate 2, and is used to freely penetrate the base plate 2 to extend into or out of the product receiving space 20 to assist in positioning the product to be sandblasted.

[0024] It should be noted that the product accommodating space 20 is a static space, which is enclosed and limited by the cover plate 3 and the bottom plate 2 when they are in the closed state. Its spatial range will not disappear or change when the cover plate 3 and the bottom plate 2 are in the open state.

[0025] To achieve the fixed spacing between the base plate 2 and the base 1, those skilled in the art can use a support plate, support column or support frame, etc. As long as it is fixed firmly and space is reserved between the two to accommodate the lifting and positioning mechanism 4, the lifting and positioning mechanism 4 can be lifted without affecting its lifting stroke.

[0026] In this embodiment, please refer to the following: Figure 2 and Figure 4 , Figure 4 for Figure 1The exploded view shown is of the sandblasting masking fixture 100. The sandblasting masking fixture 100 also includes a support column 6. The support column 6 has a first end 61 and a second end 62 opposite to each other. The first end 61 is fixedly mounted on the base 1, and the base plate 2 is fixedly mounted on the second end 62. The number of support columns 6 can be one or more, and those skilled in the art can set them according to actual needs.

[0027] The base plate 2 includes multiple openings 21 penetrating through it. These openings 21 communicate with the product receiving space 20. The base plate 2 and the base 1 are spaced apart along the penetrating direction 03 of the openings 21, their positions corresponding to the lifting and positioning mechanism 4, allowing it to pass freely through. It should be noted that the openings 21 can be closed-edge through holes or open-edge notches.

[0028] A support block 22 is also provided on the side of the base plate 2 facing the cover plate 3. The support block 22 is used to directly contact and support the non-surface surface of the product to be sandblasted, so as to prevent the product to be sandblasted from deforming or displacing under sandblasting pressure.

[0029] The cover plate 3 can be driven to rise and fall by an external drive device (such as a cylinder or servo motor) to move and close to and detach from the base plate 2. The cover plate 3 includes a sandblasting channel 310 that passes through the cover plate 3 and connects to the product receiving space 20. The shape and size of the sandblasting channel 310 are perfectly matched to the sandblasting area of ​​the product to be sandblasted. When the cover plate 3 is closed, the sand particles sprayed by the sandblasting equipment reach the sandblasting area of ​​the product to be sandblasted through the sandblasting channel 310, while other areas are blocked by the cover plate 3.

[0030] To facilitate connection with external drive devices, the surface of the cover plate 3 away from the base plate 2 is provided with a connecting screw hole 320 for connection with the interface 200 of the external drive device, so as to realize the opening and closing locking of the cover plate 3.

[0031] To improve masking accuracy and reduce maintenance costs, the cover plate 3 preferably adopts a split structure, including a detachably connected cover plate body 32 and an insert 33. The sandblasting channel 310 is provided on the insert 33, and the connecting screw hole 320 is provided on the cover plate body 32. Since the insert 33 directly defines the sandblasting boundary, its wear rate is relatively fast. Therefore, the insert 33 is made of a material with a higher hardness than the cover plate body 32 (e.g., stainless steel or hard alloy), while the cover plate body 32 can be made of a material with relatively lower hardness (e.g., plastic or aluminum alloy). This ensures both the accuracy and durability of the sandblasting boundary while reducing the overall weight and cost. Furthermore, when the insert 33 wears out, only the insert 33 needs to be replaced, without replacing the entire cover plate 3, significantly reducing consumable costs.

[0032] It is understood that the shape, size, and position of the panel 33 relative to the cover plate 3 are determined by the shape, size, and position of the area to be sandblasted on the product to be sandblasted. Those skilled in the art can set the panel 33 according to actual needs and open a corresponding installation window on the cover plate body 32 to precisely fit the panel 33 into the installation window to ensure the accuracy of the sandblasting boundary.

[0033] In this embodiment, the panel 33 is frame-shaped, and the sandblasting channel 310 is U-shaped. The cover plate body 32 includes a panel 321 fixedly connected to the panel 33 and an annular baffle 322 fixed to the side of the panel 33 facing the base plate 2 and surrounding the periphery of the panel 33. The panel 321 is embedded in the frame of the panel 33, and the annular baffle 322 is used to block the splashing of high-pressure sand particles during sandblasting, preventing sand particles from being ejected to non-processed areas of the product and improving the shielding and protection effect.

[0034] Please see Figure 5 ,for Figure 2 The diagram shows a cross-sectional view of the cover plate. On the side of the cover plate 3 facing the base plate 2, a contour-following limiting structure 35 is also provided. The contour of the contour-following limiting structure 35 precisely matches the shape of the product to be sandblasted. When the cover plate 3 is closed and locked, the contour-following limiting structure 35 completely fits against the top surface of the product to be sandblasted, assisting in pressing the product, restricting the product's freedom of movement in space, and preventing product displacement during sandblasting.

[0035] Please refer to the following: Figure 4 and Figure 6 ,in, Figure 6 for Figure 1 The diagram shows a three-dimensional assembly structure of the base and the lifting mechanism. The lifting and positioning mechanism 4 includes a drive component 41 and a vertical positioning pin 42. The drive component 41 is mounted on the base 1. The vertical positioning pin 42 is fixed to the side of the drive component 41 facing the base plate and is positioned corresponding to the opening 21. The drive component 41 drives the vertical positioning pin 42 to pass through the opening 21 and extend into or out of the product receiving space 20.

[0036] In this embodiment, the drive assembly 41 includes a first drive member 411 fixed to the base 1 and a connecting bracket 412 fixed to the first drive member 411 on the side facing the base plate 2, and the vertical positioning pin 42 is installed on the side of the connecting bracket 412 facing the base plate 2.

[0037] The connecting bracket 412 includes a first plate portion 4121 extending along a first direction 01 perpendicular to the through direction 03 and a second plate portion 4122 extending along a second direction 02 and connected to the first plate portion 4121. The second direction 02 is perpendicular to the through direction 03 and the first direction 01. The projection of the connecting bracket 412 along the through direction 03 is L-shaped. The first plate portion 4121 and the second plate portion 4122 enclose a clearance space 4123. The support column 6 passes through the clearance space 4123 to avoid motion interference.

[0038] Preferably, the first driving component 411 is a cylinder or a linear motor.

[0039] Preferably, in order to extend the service life, a dustproof protective shell 411 may be provided on the outside of the first drive component 41 to isolate the dust and high-pressure airflow in the sandblasting chamber.

[0040] The vertical positioning pin 42 includes a plurality of first vertical positioning pins 421 and a plurality of second vertical positioning pins 422. Each of the vertical positioning pins 42 is correspondingly disposed one-to-one with an opening 21 on the base plate 2. The first vertical positioning pin 421 is vertically disposed on the first plate portion 4121, and the second vertical positioning pin 422 is vertically disposed on the second plate portion 4122. When the first driving member 411 pushes the connecting bracket 412 upward, the first vertical positioning pin 421 and the second vertical positioning pin 422 simultaneously pass through the corresponding opening 21, rise from the back side of the base plate 2, and extend into the product receiving space 20.

[0041] The first vertical positioning pin 421 is used to limit the position of the product to be sandblasted in the second direction 02; the second vertical positioning pin 422 is used to limit the position of the product to be sandblasted in the first direction 01, so that the first vertical positioning pin 421 and the second vertical positioning pin 422 define the position of the product to be sandblasted from two directions on the plane of the base plate 2.

[0042] It is also understood that each of the vertical positioning pins 42 can be driven independently by multiple corresponding driving components 41, or multiple vertical positioning pins 42 can be driven by one driving component 41. Those skilled in the art can set it according to actual needs, as long as it does not interfere with the support column 6.

[0043] It should be noted that "several" in this application refers to two or more.

[0044] Preferably, there are two first vertical positioning pins 421 and two second vertical positioning pins 422. Preferably, there are two first driving members 411, with each of the two first driving members 411 corresponding to the first plate portion 4121 and the second plate portion 4122, respectively. Preferably, to achieve precise guidance during the descent of the cover plate 3, the cover plate 3 includes a guide through hole 330 penetrating the cover plate 3. The guide through hole 330 is positioned corresponding to the first vertical positioning pin 421 and is specifically located on the insert plate 33. During the closing process, it is fitted onto the first vertical positioning pin 421, guiding the cover plate 3 to fall smoothly along the extension direction of the vertical positioning pin and close onto the base plate 2. This guiding action ensures precise alignment between the cover plate 3 and the base plate 2, improving mold closing accuracy.

[0045] Preferably, please refer to the following: Figure 2 and Figure 4 To precisely limit the horizontal positioning of the product to be sandblasted, the sandblasting masking fixture 100 also includes a side-push positioning mechanism 8. The side-push positioning mechanism 8 includes a second drive member 81 fixed to the base plate 2 on the side facing the base 1 and a lateral positioning pin 82 fixedly connected to the second drive member. The second drive member 81 is vehicularly connected to the lateral positioning pin 82, and the second drive member 81 can be a cylinder or a linear motor.

[0046] The base plate 2 also includes a guide groove 23 corresponding to the lateral positioning pin 82. The guide groove 23 is perpendicular to the through direction 03 and communicates with the product receiving space 20. The second driving member 81 is configured to drive the lateral positioning pin 82 to move closer to or further away from the product to be sandblasted placed in the product receiving space 20 along the extension direction of the guide groove 23, so as to assist in positioning the product to be sandblasted.

[0047] The second driving component 81 can be installed on the base plate 2 or the base 1, as long as its driving direction is aligned with the guide groove 23 and does not interfere with the support column 6 and the lifting and positioning mechanism 4.

[0048] In this embodiment, please refer to the following: Figure 2 and Figure 7 , Figure 7 for Figure 2The diagram shows a three-dimensional assembly structure of the base plate and the side-push positioning mechanism. There are two side-push positioning mechanisms 8. One side-push positioning mechanism 8 has a lateral positioning pin 82a opposite to the first vertical positioning pin 421, with a corresponding guide groove 23a extending along the second direction 02. The lateral positioning pin 82a, in conjunction with the first vertical positioning pin 421, clamps the product to be sandblasted from the second direction 02. The other side-push positioning mechanism 8 has a lateral positioning pin 82b opposite to the second vertical positioning pin 422, with a corresponding guide groove 23b extending along the first direction 01. The lateral positioning pin 82b, in conjunction with the second vertical positioning pin 422, clamps the product to be sandblasted from the first direction 01. This achieves precise positioning of the product to be sandblasted from two directions on the plane of the base plate 2.

[0049] Preferably, the end of the lateral positioning pin 82 is fitted with a rubber sleeve 83, which is wrapped with a flexible material. This can ensure stable positioning while effectively preventing rigid contact from damaging the surface of the product to be sandblasted.

[0050] Preferably, each of the side-push positioning mechanisms 8 has two lateral positioning pins 82, and the two lateral positioning pins 82 of each side-push positioning mechanism 8 are connected to the second driving member 81 through a slider 84.

[0051] Compared to related technologies, the sandblasting masking fixture 100 provided in this application designes the vertical positioning pin 42 as a liftable type, enabling it to both position the product to be sandblasted when placed and actively retract from the product receiving space 20 before sandblasting, thus completely separating it from the product. This avoids the accumulation of high-pressure abrasive particles in the gap between the positioning pin and the product, and the resulting scratches and pressure marks on the product, making it particularly suitable for precision sandblasting of ultra-thin-walled parts.

[0052] When the first vertical positioning pin 421 is raised, it serves as both a coarse positioning reference for the product to be sandblasted and a guide post that cooperates with the guide through hole 330 on the cover plate 3 to guide the cover plate 3 to descend vertically during the closing process. Thus, a single structure realizes both positioning and guiding functions, eliminating the need for an additional guiding mechanism and simplifying the overall structure of the fixture.

[0053] The vertical positioning pin 42 provides coarse positioning, the lateral positioning pin 82 provides fine positioning in the horizontal direction, and the end of the lateral positioning pin 82 is fitted with a flexible rubber sleeve 83, which can effectively compensate for the dimensional deviation caused by the forming deformation of thin-shell parts, avoid rigid contact damage, and improve the accuracy of sandblasting boundaries and batch consistency.

[0054] This application also provides a sandblasting masking method implemented using the sandblasting masking fixture 100 described in any of the above embodiments. The method includes the following steps: Step S1: Control the drive assembly 41 to drive the vertical positioning pin 42 through the opening 21 of the base plate 2 and into the product receiving space 20 to position the sandblasting product subsequently placed in the product receiving space 20.

[0055] After this step, the vertical positioning pin 42 is in the raised state. The operator or automatic feeding robot can use the vertical positioning pin 42 as a positioning reference to place the product to be sandblasted into the product receiving space 20 to achieve coarse positioning. Specifically, the positioning reference method is that the product to be sandblasted is placed close to the first vertical positioning pin 421 and the second vertical positioning pin 422 in the second direction 02 and the first direction 01, respectively.

[0056] Step S2: Control the second driving member 81 to drive the lateral positioning pin 82 to approach the product to be sandblasted along the extension direction of the guide groove 23, so as to abut against the side wall of the product to be sandblasted placed in the product receiving space 20.

[0057] In this step, the two lateral positioning pins 82 push the product to be sandblasted toward the first vertical positioning pin 421 and the second vertical positioning pin 422, and press them together, thereby achieving precise positioning.

[0058] Step S3: Control the external drive device to drive the cover plate 3 to close onto the base plate 2 to fix the sandblasting product placed in the product receiving space 20.

[0059] In this step, during the closing process, the guide through hole 330 on the cover plate 3 is fitted onto the first vertical positioning pin 421, guiding the cover plate 3 to descend vertically until the contour limiting structure 35 presses against the product to be sandblasted.

[0060] Step S4: Control the drive component 41 to drive the vertical positioning pin 42 out of the product receiving space 20.

[0061] Step S5: Control the second drive unit 81 to drive the lateral positioning pin 82 away from the product to be sandblasted.

[0062] At this point, the vertical positioning pin 42 descends below the base plate 2, and the lateral positioning pin 82 leaves the base plate 2, both completely detaching from the product to be sandblasted. The sandblasting equipment can then perform sandblasting treatment on the product through the sandblasting channel 310 on the cover plate 3. Since the vertical positioning pin 42 and the lateral positioning pin 82 have retracted, they do not contact the product during sandblasting, completely eliminating the risk of sand accumulation and scratches.

[0063] After sandblasting is completed, the external drive device is used to move the cover plate 3 away from the base plate 2, allowing the sandblasted product to be removed. Since no sand particles accumulate in the gap between the pin and the product, it prevents scratches or jamming during removal, significantly reducing the risk of secondary damage.

[0064] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sandblasting masking fixture, comprising a base, characterized in that, Also includes: The base plate includes multiple openings penetrating the base plate, and the base plate and the base are spaced apart from each other along the penetrating direction of the openings; A cover plate is disposed on the side of the base plate away from the base. The cover plate and the base plate enclose a product receiving space that communicates with the opening. The cover plate includes a sandblasting channel that passes through the cover plate and communicates with the product receiving space. A lifting and positioning mechanism, disposed between the base and the bottom plate, includes: The drive assembly is mounted on the base; A vertical positioning pin is fixed to the side of the drive assembly facing the base plate and is provided corresponding to the opening. The drive assembly is configured to drive the vertical positioning pin to pass through the opening and extend into or out of the product receiving space.

2. The sandblasting masking fixture according to claim 1, characterized in that, It also includes a support column disposed between the base and the bottom plate, having a first end and a second end opposite to each other, the first end being mounted on the base and the bottom plate being mounted on the second end.

3. The sandblasting masking fixture according to claim 2, characterized in that, The drive assembly further includes a first drive member fixed to the base and a connecting bracket fixed to the first drive member on the side facing the base plate, and the vertical positioning pin is installed on the connecting bracket on the side facing the base plate.

4. The sandblasting masking fixture according to claim 3, characterized in that, The connecting bracket includes a first plate extending along a first direction perpendicular to the through direction and a second plate extending along a second direction and connected to the first plate. The second direction is perpendicular to both the through direction and the first direction. The projection of the connecting bracket along the through direction is L-shaped. The first plate and the second plate enclose a clearance space, and the support column passes through the clearance space. The vertical positioning pin includes a plurality of first vertical positioning pins and a plurality of second vertical positioning pins. The first vertical positioning pins are disposed on the first plate, and the second vertical positioning pins are disposed on the second plate.

5. The sandblasting masking fixture according to claim 1, characterized in that, The vertical positioning pin includes a first vertical positioning pin, and the cover plate includes a guide through hole that passes through the cover plate and is correspondingly disposed to the first vertical positioning pin. The guide through hole is used to accommodate the first vertical positioning pin so as to guide the cover plate to cover the base plate along the extension direction of the vertical positioning pin.

6. The sandblasting masking fixture according to claim 1, characterized in that, It also includes a side-push positioning mechanism, which includes a second driving member fixed to the side of the base plate facing the base and a lateral positioning pin fixedly connected to the second driving member; the base plate also includes a guide groove corresponding to the lateral positioning pin, the guide groove extends perpendicular to the through direction and communicates with the product receiving space, the second driving member is configured to drive the lateral positioning pin to move closer to or away from the product to be sandblasted along the extension direction of the guide groove, and the product to be sandblasted is placed in the product receiving space.

7. The sandblasting masking fixture according to claim 1, characterized in that, The cover plate also includes a cover plate body and a panel fixedly connected to the cover plate body. The sandblasting channel is provided in the panel, and the panel is made of a material with a hardness higher than that of the cover plate body.

8. The sandblasting masking fixture according to claim 7, characterized in that, The cover plate body includes a panel fixedly connected to the panel and an annular retaining wall fixed to the side of the panel facing the base plate and surrounding the periphery of the panel. The annular retaining wall is located on the side of the panel away from the panel and is used to prevent sand particles from flying into the non-processing area.

9. The sandblasting masking fixture according to claim 7, characterized in that, The cover plate body includes a contour-following limiting structure disposed on the side of the cover plate facing the base plate, the contour of the contour-following limiting structure being adapted to the shape of the product to be sandblasted.

10. The sandblasting masking fixture according to claim 1, characterized in that, It also includes several support blocks, which are installed on the side of the base plate facing the product receiving space to support the product to be sandblasted.

11. A sandblasting masking method, applied to a sandblasting masking fixture as described in any one of claims 1 to 10, characterized in that, include: The drive assembly is controlled to drive the vertical positioning pin through the opening in the base plate and into the product receiving space to position the sandblasted product subsequently placed in the product receiving space. The external drive device is controlled to drive the cover plate to close onto the base plate, thereby fixing the sandblasting product placed in the product receiving space; The drive assembly is controlled to drive the vertical positioning pin out of the product receiving space.

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