A sandblasting device for tool production

By combining rotation and shaking components with angle adjustment, the problem of uneven sandblasting was solved, achieving uniform sandblasting of the tool surface and a simplified tool change process, thus improving sandblasting efficiency and quality.

CN224390826UActive Publication Date: 2026-06-23CHANGSHU KAIDE NUMERICAL CONTROL CUTTING TOOLS CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHANGSHU KAIDE NUMERICAL CONTROL CUTTING TOOLS CO LTD
Filing Date
2025-07-28
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing sandblasting equipment used for tool production, the fixed nozzle position results in uneven sandblasting effect and fails to completely cover the tool surface.

Method used

The system employs a rotating component and an adjusting component. The first geared motor drives the rotating base to rotate, while the second geared motor drives the movable block to shake via the connecting arm and connecting plate. Combined with the adjusting component, the nozzle angle is adjusted, enabling the nozzle to move at multiple angles in three-dimensional space, ensuring that the sand flow evenly covers the surface of the tool.

Benefits of technology

It improves the uniformity and overall quality of tool sandblasting, simplifies the tool installation and disassembly process, and reduces replacement time.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the technical field of tool manufacturing, and in particular to a sandblasting device for tool manufacturing. It includes a processing table, a rotating assembly on top of the processing table, a side plate welded to one side of the processing table, a replacement assembly on top of the rotating assembly, and an adjustment assembly located slightly above the center of the side plate. This utility model utilizes a first reduction motor in the rotating assembly to drive a rotating base to rotate, and a second reduction motor, through a connecting arm, connecting plate, and side arm, to drive a movable block to shake. This allows the turntable mounted on top of the movable block and the tool to move at multiple angles in three-dimensional space. In the adjustment assembly, the operator can adjust the sandblasting angle of the nozzles according to the actual height of the tool. One set of nozzles is flush with the L-plate mounting surface, responsible for sandblasting the side of the tool, while another set of nozzles is slightly higher than the highest point of the L-plate, responsible for sandblasting the top of the tool. Combined with the multi-angle movement of the tool, the uniformity of the sandblasting is improved.
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Description

Technical Field

[0001] This utility model relates to the technical field of cutting tool production, and in particular to a sandblasting device for cutting tool production. Background Technology

[0002] In the cutting tool manufacturing industry, passivation sandblasting is a key process to improve tool performance. Its quality directly affects the tool's service life and machining accuracy. Therefore, a sandblasting device for tool production is particularly needed.

[0003] A tool passivation sandblasting device, authorized by announcement number CN221818381U, includes: a bracket with a driven rotating shaft running vertically through the bracket, and multiple support plates fixedly connected to the shaft; a tool positioning assembly; the tool positioning assembly includes a circular plate placed on the support plate, a U-shaped plate running through the circular plate, one end of the U-shaped plate passing through the end of the circular plate, multiple tool grooves on the outer wall of the circular plate, positioning bolts threaded into the tool grooves on the circular plate, and four limiting posts passing through the support plate fixedly connected to the bottom of the circular plate; and a sandblasting assembly. This utility model replaces the entire circular plate to achieve tool replacement, utilizing the sandblasting time for tool disassembly and replacement, thus greatly improving the efficiency of tool sandblasting. Removing the circular plate for tool disassembly and replacement is more convenient and ensures the stability of the circular plate after installation.

[0004] However, in the aforementioned tool passivation sandblasting device, the nozzle is located on one side of the circular plate, and the fixed position of the nozzle makes it impossible for the tool surface to be completely covered by the sand flow, resulting in uneven sandblasting effect.

[0005] To address the aforementioned issues, a sandblasting device for tool production is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a sandblasting device for tool production, in order to solve the problems of existing sandblasting devices for tool production mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sandblasting device for tool production, comprising a processing table, a rotating assembly on the top of the processing table, a side plate welded to one side of the processing table, a replacement assembly on the top of the rotating assembly, and an adjustment assembly located slightly above the center of the side plate.

[0008] The rotating assembly includes a rotating base mounted on the top of the processing table. An adjusting seat is rotatably connected to the top of the rotating base at the center position. A movable block is rotatably connected between the two ends of the adjusting seat. Side arms are rotatably connected to both sides of the movable block. A connecting plate is obliquely provided on one side of the side arm. A connecting arm is connected to one side of the connecting plate.

[0009] The adjustment component is used to adjust the sandblasting angle according to the tool height.

[0010] Preferably, the rotating assembly further includes a first geared motor installed at the bottom of the processing table, a second geared motor installed on one side of the rotating base, and a connecting arm connected to one side of the connecting end of the second geared motor.

[0011] Preferably, the connecting end at the top of the first geared motor passes through the processing table and connects to the rotating base. The side arm, connecting plate, and connecting arm are all provided in two sets, and the two sets of connecting plates have the same tilt direction.

[0012] Preferably, the adjustment assembly includes a second mounting groove opened in the upper middle part of the side plate. One end of the side plate has two sets of internal threaded grooves. Two sets of nozzles are installed on the inner wall of the second mounting groove. One end of each nozzle is connected to a rotating shaft, and the rotating shaft passes through the side plate. One end of each rotating shaft has a through hole, and the inner wall of each through hole is provided with a positioning bolt, which is threadedly connected to the internal threaded groove.

[0013] Preferably, the replacement component includes a turntable mounted on top of the movable block, a central column welded to the center point of the turntable, six sets of L-plates arranged on the top of the turntable with the center column as the axis, and a top cover threadedly connected to the top of the central column.

[0014] Preferably, the replacement component further includes two sets of mounting plates installed at the bottom of the turntable, and the mounting plates are located at both ends of the movable block and bolted to the movable block. The top of the turntable is provided with six sets of limiting plates with the center of the central column as the axis, and the limiting plates correspond one-to-one with the L-plate and are embedded in the bottom wall of the L-plate. The central column is provided with six sets of first mounting grooves with the center as the axis, and the first mounting grooves are connected to the L-plate slots.

[0015] Preferably, the top of the central column is externally threaded and its diameter is smaller than the diameter of the slotted cross-section, and the bottom diameter of the top cover is the same as the diameter of the slotted cross-section of the central column.

[0016] Preferably, one set of nozzles is flush with the mounting surface of the L-plate, and the other set of nozzles is slightly higher than the highest point of the L-plate.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In the rotating assembly, the first geared motor drives the rotating base to rotate, and the second geared motor drives the movable block to shake through the connecting arm, connecting plate and side arm. The combination of rotation and shaking enables the turntable and the cutter mounted on the top of the movable block to move at multiple angles in three-dimensional space.

[0019] 2. In the adjustment component, the operator can flexibly adjust the sandblasting angle of the nozzle according to the actual height of the tool. One set of nozzles is flush with the L-plate mounting surface and is responsible for sandblasting the side of the tool, while the other set of nozzles is slightly higher than the highest point of the L-plate and is responsible for sandblasting the top of the tool. Combined with the multi-angle movement of the tool, the sand flow can evenly cover all surfaces of the tool, avoiding sandblasting dead corners and greatly improving the uniformity and overall quality of tool sandblasting.

[0020] 3. The process of installing and removing the cutting tools in the replacement components is simple. By unscrewing and tightening the top cover, the L-plate and cutting tools can be easily replaced, reducing the time required for cutting tool replacement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the rotating component of this utility model;

[0023] Figure 3 This is a schematic diagram showing the disassembled structure of the adjustment component of this utility model;

[0024] Figure 4 This is a schematic diagram of the disassembled structure of the replaceable components of this utility model. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the disassembled structure of the replaceable components of this utility model. Figure 2 .

[0026] In the diagram: 1. Processing table; 2. Rotating assembly; 201. Rotating base; 202. Adjusting seat; 203. Movable block; 204. Side arm; 205. Connecting plate; 206. Connecting arm; 207. First geared motor; 208. Second geared motor; 3. Side plate; 4. Replacement assembly; 401. Turntable; 402. Center column; 403. L-plate; 404. Top cover; 405. Mounting plate; 406. Limiting plate; 407. First mounting slot; 5. Adjusting assembly; 501. Second mounting slot; 502. Internal threaded groove group; 503. Nozzle; 504. Rotating shaft; 505. Through hole; 506. Positioning bolt. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] Example

[0029] like Figure 1-3As shown, the assembly includes a processing table 1, a rotating component 2 on the top of the processing table 1, a side plate 3 welded to one side of the processing table 1, a replacement component 4 on the top of the rotating component 2, and an adjustment component 5 located slightly above the center of the side plate 3. The rotating component 2 includes a rotating base 201 mounted on the top of the processing table 1, an adjustment seat 202 rotatably connected to the top of the rotating base 201 at its center, a movable block 203 rotatably connected between the two ends of the adjustment seat 202, side arms 204 rotatably connected to both sides of the movable block 203, a connecting plate 205 obliquely provided on one side of the side arm 204, and a connecting arm 206 connected to one side of the connecting plate 205. The rotating component 2 also includes a first reduction motor 207 mounted on the bottom of the processing table 1, a second reduction motor 208 mounted on one side of the rotating base 201, and a connecting arm 206 connected to one side of the connecting end of the second reduction motor 208.

[0030] It should be noted that in this embodiment, the first geared motor 207 installed at the bottom of the processing table 1 and the second geared motor 208 installed on one side of the rotating base 201 are first started. After the first geared motor 207 is powered on, it starts to run. Its top connecting end passes through the pre-drilled hole on the processing table 1 and connects to the rotating base 201. The power output of the motor is transmitted to the rotating base 201 through the connecting end, causing the rotating base 201 to start rotating around its central axis. After the second geared motor 208 starts running, its connecting end drives the connecting arm 206 connected to it to move. The connecting plate 205 is connected to the side arm 204. When the connecting arm 206 moves, it will transmit the force to the side arm 204 through the connecting plate 205. Since the side arm 204 is rotatably connected to the movable block 203, and the movable block 203 is rotatably connected between the two ends of the adjusting seat 202, the movement of the side arm 204 causes the movable block 203 to make a rocking motion on the adjusting seat 202. The rocking motion combined with the rotation of the rotating base 201 enables the turntable 401 and the cutter installed on the top of the movable block 203 to move at multiple angles in three-dimensional space, which provides a foundation for subsequent uniform sandblasting.

[0031] The adjustment component 5 includes a second mounting groove 501 opened in the upper middle part of the side plate 3. Two sets of internally threaded grooves 502 are opened at one end of the side plate 3. Two sets of nozzles 503 are installed on the inner wall of the second mounting groove 501. One end of each nozzle 503 is connected to a rotating shaft 504, which passes through the side plate 3. One end of each rotating shaft 504 has a through hole 505, and a positioning bolt 506 passes through the inner wall of each through hole 505. The positioning bolt 506 is threadedly connected to the internally threaded groove 502. Before sandblasting, the operator adjusts the nozzle 503 to a suitable sandblasting angle according to the height of the tool to ensure that the abrasive can be accurately sprayed onto all parts of the tool. The operator first manually loosens the positioning bolt 506 to loosen the threaded connection between the positioning bolt 506 and the internal thread groove assembly 502. Since the rotating shaft 504 connected to one end of the nozzle 503 passes through the reserved hole on the side plate 3, the nozzle 503 can rotate freely around the rotating shaft 504 after the positioning bolt 506 is loosened. The operator holds the nozzle 503 by hand. Slowly rotate the nozzle 503 to achieve a suitable sandblasting angle. During rotation, observe the relative position between the nozzle 503 and the tool to ensure accurate angle adjustment. Once the nozzle 503 is adjusted to the appropriate sandblasting angle, the operator passes the positioning bolt 506 through the through hole 505 at one end of the rotating shaft 504, and then connects the positioning bolt 506 to the internal thread groove group 502. Rotate the positioning bolt 506 clockwise to gradually tighten it, firmly fixing the nozzle 503 at the adjusted angle position to prevent the nozzle 503 from shifting angle during sandblasting. One set of nozzles 503 is flush with the mounting surface of the L plate 403, and the sprayed sand mainly acts on the side of the tool to sandblast the side of the tool. The other set of nozzles 503 is slightly higher than the highest point of the L plate 403, and the sprayed sand can cover the top of the tool to sandblast the top of the tool. Combined with the multi-angle movement of the tool driven by the rotating component 2, the sand can be evenly sprayed onto all surfaces of the tool to achieve uniform sandblasting of the tool.

[0032] Furthermore, the nozzle 503 is connected to an external sandblasting pipe. The sand is transported to the inside of the nozzle 503 through the sandblasting pipe. Inside the sandblasting pipe, the sand forms a high-speed sand flow under the action of compressed air. When the sand flow reaches the nozzle 503, the sand flow is ejected from the nozzle 503. The sandblasting process of the nozzle 503 is existing technology in this field and will not be further described here. The external power source is existing mature technology and is not shown in the attached drawings of this device.

[0033] like Figure 4 , 5As shown, the replacement component 4 includes a turntable 401 installed on the top of the movable block 203. A central column 402 is welded to the center point of the turntable 401. Six sets of L-plates 403 are provided on the top of the turntable 401 with the center of the central column 402 as the axis. A top cover 404 is threadedly connected to the top of the central column 402. The replacement component 4 also includes two sets of mounting plates 405 installed on the bottom of the turntable 401. The mounting plates 405 are located at both ends of the movable block 203 and are bolted to the movable block 203. Six sets of limiting plates 406 are provided on the top of the turntable 401 with the center of the central column 402 as the axis. The limiting plates 406 correspond one-to-one with the L-plates 403 and are embedded in the bottom wall of the L-plates 403. Six sets of first mounting grooves 407 are opened on the central column 402 with the center as the axis. The first mounting grooves 407 are connected to the L-plates 403 through slots.

[0034] It should be noted that in this embodiment, the operator manually holds the top cover 404 and rotates it counterclockwise. Since the top of the central column 402 has an external thread and the bottom of the top cover 404 has a matching internal thread, the top cover 404 can be unscrewed from the top of the central column 402, exposing the first mounting groove 407 on the central column 402. The tool to be sandblasted is then accurately placed on the bottom surface of the L plate 403. During placement, the L plate 403 is aligned with the corresponding first mounting groove 407 on the central column 402. Then, the L plate 403 is inserted into the first mounting groove 407. Inside, the initial positioning is achieved. At the same time, the limiting plate 406 will be embedded in the bottom wall of the L plate 403 to further restrict the position of the L plate 403, ensuring that the tool is accurately positioned during installation and avoiding deviation or shaking. Then, the top cover 404 is lifted up, and its bottom internal thread is aligned with the top external thread of the center column 402. The top cover 404 is rotated clockwise. As it rotates, the top cover 404 gradually moves downward and finally fits tightly against the top of the center column 402, which fixes the tool installed on the L plate 403 and prevents the tool from loosening during the subsequent sandblasting process.

[0035] After the tool has been sandblasted, the operator first unscrews the top cover 404 from the top of the center column 402 to release the tool and L plate 403 from the fixation. Then, the operator holds the L plate 403 with the sandblasted tool installed and pulls it out of the first mounting groove 407 on the center column 402, while separating the limiting plate 406 from the L plate 403. The pulled-out L plate 403 is placed aside in preparation for the subsequent tool disassembly operation. Then, the operator takes the L plate 403 with the new tool installed and repeats the tool installation steps, accurately inserting the L plate 403 into the corresponding first mounting groove 407 on the center column 402 and embedding the limiting plate 406 into the bottom wall of the L plate 403. Finally, the operator screws the top cover 404 onto the top of the center column 402 to fix the newly installed tool and L plate 403.

[0036] Furthermore, the mounting plate 405 is set at the bottom of the turntable 401 and located at both ends of the movable block 203. It is connected to the movable block 203 by bolts. When the rotating component 2 is working and the movable block 203 shakes, the mounting plate 405 can ensure that the turntable 401 moves synchronously with the movable block 203.

[0037] Furthermore, the installation and removal process of the cutting tool on the L-plate 403 is a mature technology in the field and will not be described here.

[0038] Working principle of this utility model:

[0039] Refer to the instruction manual appendix Figure 1-5 First, install the L-plate 403. The operator manually holds the top cover 404 and rotates it counterclockwise. Since the top of the center column 402 has external threads and the bottom of the top cover 404 has matching internal threads, the top cover 404 can be unscrewed from the top of the center column 402, exposing the first mounting groove 407 on the center column 402. The tool to be sandblasted is then accurately placed on the bottom surface of the L-plate 403. During placement, the L-plate 403 is aligned with the corresponding first mounting groove 407 on the center column 402. Then, the L-plate 403 is inserted into the first mounting groove 407. Initial positioning is achieved. At the same time, the limiting plate 406 will be embedded in the bottom wall of the L plate 403 to further restrict the position of the L plate 403, ensuring that the tool is accurately positioned during installation and avoiding deviation or shaking. Then, the top cover 404 is lifted up, and its bottom internal thread is aligned with the top external thread of the center column 402. The top cover 404 is rotated clockwise. As it rotates, the top cover 404 gradually moves downward and finally fits tightly against the top of the center column 402, which fixes the tool installed on the L plate 403 and prevents the tool from loosening during subsequent sandblasting.

[0040] The operator then adjusts the nozzle 503 to a suitable sandblasting angle based on the height of the blade to ensure that the sand can be accurately sprayed onto all parts of the blade. The operator first manually loosens the positioning bolt 506 to disconnect the threaded connection between the positioning bolt 506 and the internal threaded groove assembly 502. Since the rotating shaft 504 connected to one end of the nozzle 503 passes through the pre-drilled hole on the side plate 3, the nozzle 503 can rotate freely around the rotating shaft 504 after the positioning bolt 506 is loosened. The operator holds the nozzle 503 and slowly rotates it to achieve the desired sandblasting angle. To ensure accurate angle adjustment, observe the relative position between the nozzle 503 and the cutter during rotation. Once the nozzle 503 is adjusted to the appropriate angle, the operator passes the positioning bolt 506 through the through hole 505 at one end of the rotating shaft 504, and then connects the positioning bolt 506 to the internal thread groove group 502. Rotate the positioning bolt 506 clockwise to gradually tighten it, firmly fixing the nozzle 503 at the adjusted angle position to prevent the nozzle 503 from shifting angle during sandblasting.

[0041] Next, the first geared motor 207 installed at the bottom of the processing table 1 and the second geared motor 208 installed on one side of the rotating base 201 are started. After the first geared motor 207 is powered on, it starts to run. Its top connecting end passes through the pre-drilled hole on the processing table 1 and connects to the rotating base 201. The power output of the motor is transmitted to the rotating base 201 through the connecting end, causing the rotating base 201 to start rotating around its central axis. After the second geared motor 208 starts running, its connecting end drives the connecting arm 206 connected to it to move. The connecting plate 205 is connected to the side arm 204. When the connecting arm 206 moves, it will transmit the force to the side arm 204 through the connecting plate 205. Since the side arm 204 is rotatably connected to the movable block 203, and the movable block 203 is rotatably connected between the two ends of the adjusting seat 202, the movement of the side arm 204 causes the movable block 203 to make a rocking motion on the adjusting seat 202. The rocking motion combined with the rotation of the rotating base 201 enables the turntable 401 installed on the top of the movable block 203 and the cutter to move at multiple angles in three-dimensional space.

[0042] One set of nozzles 503 is flush with the mounting surface of L plate 403, and the sprayed sand mainly acts on the side of the tool to perform sandblasting treatment on the side of the tool. The other set of nozzles 503 is slightly higher than the highest point of L plate 403, and the sprayed sand can cover the top of the tool to perform sandblasting on the top of the tool. Combined with the rotating component 2 driving the tool to move at multiple angles, the sand can be evenly sprayed onto all surfaces of the tool to achieve uniform sandblasting of the tool.

[0043] After the tool has been sandblasted, the operator first unscrews the top cover 404 from the top of the center column 402 to release the tool and L plate 403 from their fixation. Then, the operator holds the L plate 403 with the sandblasted tool installed and pulls it out of the first mounting slot 407 on the center column 402, while simultaneously separating the limiting plate 406 from the L plate 403. The pulled-out L plate 403 is placed aside in preparation for the subsequent tool disassembly operation. Then, the operator takes the L plate 403 with the new tool installed and repeats the tool installation steps, accurately inserting the L plate 403 into the corresponding first mounting slot 407 on the center column 402, and embedding the limiting plate 406 into the bottom wall of the L plate 403. Finally, the operator screws the top cover 404 onto the top of the center column 402 to fix the newly installed tool and L plate 403.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sandblasting apparatus for tool production, comprising a processing table (1), characterized in that: The top of the processing table (1) is provided with a rotating component (2), a side plate (3) is welded to one side of the processing table (1), a replacement component (4) is provided on the top of the rotating component (2), and an adjustment component (5) is provided on the upper part of the middle of the side plate (3). The rotating assembly (2) includes a rotating base (201) mounted on the top of the processing table (1). An adjusting seat (202) is rotatably connected to the top of the rotating base (201) at the center position. A movable block (203) is rotatably connected between the two ends of the adjusting seat (202). Side arms (204) are rotatably connected to both sides of the movable block (203). A connecting plate (205) is obliquely provided on one side of the side arm (204). A connecting arm (206) is connected to one side of the connecting plate (205). The adjustment component (5) is used to adjust the sandblasting angle according to the tool height.

2. The sandblasting device for tool production according to claim 1, characterized in that: The rotating assembly (2) also includes a first geared motor (207) installed at the bottom of the processing table (1), a second geared motor (208) installed on one side of the rotating base (201), and a connecting arm (206) connected to one side of the connecting end of the second geared motor (208).

3. A sandblasting device for tool production according to claim 2, characterized in that: The top connection end of the first geared motor (207) is connected to the processing table (1) and the rotating base (201). The side arm (204), the connecting plate (205) and the connecting arm (206) are all provided in two sets, and the two sets of connecting plates (205) are inclined in the same direction.

4. A sandblasting device for tool production according to claim 1, characterized in that: The adjustment component (5) includes a second mounting groove (501) opened in the upper middle part of the side plate (3). Two sets of internal thread grooves (502) are opened at one end of the side plate (3). Two sets of nozzles (503) are installed on the inner wall of the second mounting groove (501). One end of each nozzle (503) is connected to a rotating shaft (504), and the rotating shafts (504) are respectively inserted through the side plate (3). One end of each rotating shaft (504) is provided with a through hole (505). The inner wall of each through hole (505) is provided with a positioning bolt (506), and the positioning bolt (506) is threadedly connected to the internal thread groove (502).

5. A sandblasting device for tool production according to claim 1, characterized in that: The replacement component (4) includes a turntable (401) mounted on the top of the movable block (203), a central column (402) welded to the center point of the turntable (401), and six sets of L-plates (403) arranged on the top of the turntable (401) with the center of the central column (402) as the axis. A top cover (404) is threadedly connected to the top of the central column (402).

6. A sandblasting device for tool production according to claim 5, characterized in that: The replacement component (4) also includes two sets of mounting plates (405) installed at the bottom of the turntable (401), and the mounting plates (405) are located at both ends of the movable block (203) and bolted to the movable block (203). The top of the turntable (401) is provided with six sets of limiting plates (406) with the center of the central column (402) as the axis, and the limiting plates (406) correspond one-to-one with the L plate (403) and are embedded in the bottom wall of the L plate (403). The central column (402) is provided with six sets of first mounting grooves (407) with the center as the axis, and the first mounting grooves (407) are connected to the slots of the L plate (403).

7. A sandblasting device for tool production according to claim 5, characterized in that: The top of the central column (402) is externally threaded and its diameter is smaller than the diameter of the slotted cross section. The bottom diameter of the top cover (404) is the same as the diameter of the slotted cross section of the central column (402).

8. A sandblasting device for tool production according to claim 4, characterized in that: One set of nozzles (503) is flush with the mounting surface of the L plate (403), and the other set of nozzles (503) is slightly higher than the highest point of the L plate (403).