A screw surface defect visual detection device for screw machine set manufacturing

Abstract

The application discloses a screw surface defect visual detection device for screw unit manufacturing, and relates to the field of optical detection equipment.The device comprises a device base and a gantry, an electric sliding table is installed on the outer side of the gantry, an optical detection probe is installed on the outer side of the electric sliding table, a material placing frame is installed on the top of the device base, two material placing tables are arranged on the top of the material placing frame, four symmetrically-distributed supporting arms are installed on the top of the material placing table, and a driving wheel is installed on the top of the material placing table; the device further comprises a fixed rod mechanism for screw positioning and rotation, and the fixed rod mechanism comprises two driven wheels symmetrically arranged on the top of the material placing table; through the fixed rod mechanism, when the screw is placed above the two material placing tables, the two driven wheels on the top of the material placing table and the driving wheel are abutted against the end of the screw, auxiliary support is provided for the two ends of the screw, the screw is rotated, the optical detection probe which is convenient to move horizontally can detect the surface defects of the screw, and the effect of comprehensive detection is achieved.

Description

Technical Field

[0001] This invention relates to the field of optical inspection equipment, specifically a visual inspection device for surface defects of screws used in screw mill manufacturing. Background Technology

[0002] Screw chillers are vapor compression refrigeration devices with a screw compressor at their core. Their key component is a pair of meshing male and female screws. During operation, the screws rotate at high speed, forming a closed volume between their teeth that gradually decreases with rotation. This forces the refrigerant gas to compress, increasing its pressure and temperature, thus completing the refrigeration cycle. These units are stable and highly reliable, and are widely used in central air conditioning systems and various industrial process cooling applications.

[0003] Screw compressor units rely on the minute gaps between the male and female rotor teeth and between the tooth tips and the casing to form a sealed cavity. If there are minute defects on the screw surface, high-pressure gas can easily leak to the low-pressure side under high-speed rotation and high-pressure differential conditions. Therefore, during the screw compressor unit manufacturing process, optical inspection probes are required to visually inspect the screw surface for defects. To ensure inspection accuracy, existing inspection devices typically use an electric gripper to hold one end of the screw for positioning, while a rotating support plate presses the other end of the screw. The electric gripper then drives the screw to rotate, and the optical probe performs online inspection. However, in this method, the electric gripper and support plate obstruct the end faces of both ends of the screw, requiring secondary inspection of both ends after the outer diameter inspection is completed. The overall operation is cumbersome and the inspection efficiency is low. Summary of the Invention

[0004] The purpose of this invention is to provide a visual inspection device for screw surface defects in screw compressor manufacturing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A visual inspection device for surface defects of screws used in screw compressor manufacturing includes: a device base and a gantry frame fixedly installed on the top of the device base; an electric slide table fixedly installed on the outer side of the gantry frame; an optical inspection probe installed on the outer side of the electric slide table; a material placement frame fixedly installed on the top of the device base; two symmetrically distributed material placement platforms arranged on the top of the material placement frame; four symmetrically distributed support arms fixedly installed on the top of the material placement platforms; and drive wheels installed on the top of the material placement platforms; the device also includes: a rod fixing mechanism for positioning and rotating the screw; the rod fixing mechanism is installed on the top of the gantry frame and the material placement platforms. The structure includes two driven wheels symmetrically arranged on the top of the material placement platform, which cooperate with the drive wheel to provide auxiliary support for the screw; a distance adjustment mechanism for adjusting the distance between the two material placement platforms, the distance adjustment mechanism being installed at the bottom of the material placement platform, the distance adjustment mechanism including a movable block fixedly installed at the bottom of the material placement platform, the movable block being able to adjust the position of the material placement platform; and a fixed angle mechanism for locking the angle of the support arm, the fixed angle mechanism being installed on the inner side of the support arm, the fixed angle mechanism including a limiting block slidably installed on the inner side of the support arm, the limiting block being able to lock the swing angle of the support arm.

[0006] Preferably, the fixed rod mechanism further includes two positioning plates symmetrically fixedly installed on the top of the material placement platform. The drive wheel is rotatably installed between the two positioning plates, and the driven wheel is rotatably installed between two adjacent support arms. The support arms have an arc-shaped structure, and the center of the support arm is the same as the center of the drive wheel. Arc-shaped blocks are rotatably installed at both ends of the driven wheel. An arc-shaped groove is provided on the outer side of the support arm for the arc-shaped blocks to slide in a limited manner. An arc-shaped rod is fixedly installed at the bottom of the arc-shaped block. A slider is fixedly installed at the end of the arc-shaped rod away from the arc-shaped block. An arc-shaped cavity is provided on the inner side of the support arm for the arc-shaped rod and the slider to slide in a limited manner. A first spring is fixedly installed between the side of the slider away from the arc-shaped rod and the inner side of the arc-shaped cavity. A first synchronous belt is rotatably installed between one end of the driven wheel and one end of the drive wheel.

[0007] Preferably, the adjusting mechanism further includes a counter-rotating screw rotatably mounted inside the material placement frame, two moving blocks threadedly fitted to the two ends of the counter-rotating screw, and two optical shafts for limiting the sliding of the moving blocks fixedly mounted inside the material placement frame. A handwheel is fixedly mounted at one end of the counter-rotating screw. Two symmetrically distributed fixing plates are fixedly mounted on the top of the device base. A prismatic rod is rotatably mounted between the two fixing plates. A sleeve is rotatably mounted inside the material placement platform. The inner side of the sleeve has a prismatic structure, and the sleeve is fitted onto the outer side of the prismatic rod. A second synchronous belt is rotatably mounted between one end of the drive wheel and the sleeve. A drive motor is fixedly mounted on the outer side of the fixing plate located on the left side of the device base, and the output end of the drive motor is fixedly connected to one end of the prismatic rod.

[0008] Preferably, the fixed angle mechanism further includes a mounting frame fixedly installed on the outside of the limiting block. The inner side of the support arm has a mounting cavity for the mounting frame and the limiting block to slide relative to each other. The top of the limiting block has a sloping structure, and the outer side of the arc-shaped rod has multiple equally spaced slots for the limiting block to insert into the limiting block. A second spring is fixedly installed between the side of the mounting frame away from the limiting block and the inner side of the mounting cavity. A stop block is fixedly installed on the inner side of the mounting frame. A push rod is slidably installed between two adjacent support arms. Two push blocks are fixedly installed on the outer side of the push rod, respectively slidably installed on the inner side of the two mounting frames. The outer side of the push block contacts the outer side of the stop block, and the contact surfaces of the push block and the stop block are both sloping structures. Two convex rings are fixedly installed on the outer side of the push rod, and a third spring is fixedly installed between the convex rings and the outer side of the support arm. Two stop rods are fixedly installed on the side of the fixing plate near the push rod, and the two stop rods are respectively on the same horizontal line as the two push rods.

[0009] Preferably, the outer sides of both the drive wheel and the driven wheel are made of rubber, and anti-slip grooves are provided on the outer sides of both the drive wheel and the driven wheel.

[0010] Preferably, positioning ribs are fixedly installed on both sides of the arc-shaped block, and a positioning groove is provided in the arc-shaped groove of the support arm for the positioning ribs to slide in a limited manner.

[0011] Preferably, both ends of the drive wheel are rotatably mounted with folding plates, and the folding plates have a V-shaped structure. The end of the drive wheel is located in the middle of the folding plate, and the two driven wheels are rotatably mounted at both ends of the two folding plates respectively.

[0012] Preferably, a limiting cylinder is fixedly installed on the outer side of the sleeve, and a limiting cavity for installing the limiting cylinder is provided on the inner side of the material placement platform.

[0013] Preferably, a support platform is fixedly installed on the top of the material placement frame, and the prismatic rod and the opposite-direction screw are both rotatably installed on the inner side of the support platform.

[0014] Preferably, a support rod is sleeved on the inner side of the second spring, and the support rod is fixedly installed on the outer side of the mounting frame, and the support rod slides through the support arm.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention, through a fixed rod mechanism, enables the two driven wheels and the drive wheel at the top of the material placement platform to abut against the end of the screw when the screw is placed above the two material placement platforms, providing auxiliary support for both ends of the screw and causing the screw to rotate. This facilitates the lateral movement of the optical inspection probe to perform surface defect detection on the screw, thereby achieving a comprehensive inspection effect.

[0016] 2. The present invention uses an adjustable distance mechanism to synchronously adjust the positions of two moving blocks using opposite-direction screws, so that the two moving blocks drive the two material placement platforms to move closer or further apart, thereby facilitating the positioning and detection of screws of more sizes.

[0017] 3. The present invention, through a fixed angle mechanism, enables the limiting block to be inserted into the slot of the arc-shaped rod when the driven wheel is pushed downward at the end of the screw, thereby achieving the positioning of the driven wheel. This facilitates the timely placement of the next screw on the driven wheel after the current screw inspection is completed, thus improving the convenience of inspecting multiple screws. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the material placement frame and the moving block in this invention. Figure 3 This is a partial cross-sectional structural diagram of the material platform and sleeve in this invention; Figure 4 This is a schematic diagram of the folding plate and driven wheel structure in this invention; Figure 5 This is a schematic diagram of a partial cross-sectional structure of the arc-shaped block and arc-shaped rod in this invention; Figure 6 for Figure 5 Enlarged structural diagram of area A in the middle; Figure 7 This is a schematic diagram of a partial cross-sectional structure of the support arm and push rod in this invention; Figure 8 This is a partial cross-sectional structural diagram of the stop block and push block in this invention.

[0019] In the diagram: 1. Device base; 2. Gantry frame; 3. Electric slide table; 4. Optical detection probe; 5. Material placement frame; 6. Material placement platform; 7. Support arm; 8. Drive wheel; 9. Driven wheel; 10. Moving block; 11. Limiting block; 12. Positioning plate; 13. Arc-shaped block; 14. Arc-shaped rod; 15. Slider; 16. First spring; 17. First synchronous belt; 18. Opposite screw; 19. Handwheel; 20. Fixing plate; 21. Prism rod; 22. Sleeve; 23. Drive motor; 24. Mounting frame; 25. Second spring; 26. Stop block; 27. Push rod; 28. Push block; 29. ​​Convex ring; 30. Third spring; 31. Stop rod; 32. Folding plate; 33. Limiting cylinder; 34. Support platform; 35. Support rod; 36. Second synchronous belt. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1-8 The diagram shows a visual inspection device for surface defects of screws used in screw mill manufacturing. It includes a device base 1 and a gantry frame 2 fixedly installed on the top of the device base 1. An electric slide 3 is fixedly installed on the outside of the gantry frame 2, and an optical inspection probe 4 is installed on the outside of the electric slide 3. A material placement frame 5 is fixedly installed on the top of the device base 1. Two symmetrically distributed material placement platforms 6 are provided on the top of the material placement frame 5. Four symmetrically distributed support arms 7 are fixedly installed on the top of the material placement platforms 6. A drive wheel 8 is installed on the top of the material placement platforms 6. The two ends of the screw can be placed on the two material placement platforms 6 respectively, so that the four support arms 7 on the material placement platforms 6 and the drive wheel 8 abut against the ends of the screw to achieve positioning of the screw. The friction between the drive wheel 8 and the screw drives the screw to rotate. At the same time, the electric slide 3 drives the optical inspection probe 4 to move laterally, so that the optical inspection probe 4 performs visual inspection of surface defects on the rotating screw. The fixed rod mechanism includes two driven wheels 9 symmetrically arranged on the top of the material placement platform 6. The driven wheels 9 can cooperate with the drive wheel 8 to provide auxiliary support for the screw. The fixed rod mechanism also includes two positioning plates 12 symmetrically fixedly installed on the top of the material placement platform 6. The drive wheel 8 is rotatably installed between the two positioning plates 12, and the driven wheels 9 are rotatably installed between two adjacent support arms 7. The support arms 7 have an arc-shaped structure, and the center of the support arm 7 is the same as the center of the drive wheel 8. Arc-shaped blocks 13 are rotatably installed at both ends of the driven wheels 9. Arc-shaped grooves for limiting the sliding of the arc-shaped blocks 13 are opened on the outer side of the support arm 7. When the end of the screw contacts the two driven wheels 9... The screw's weight can push the driven wheel 9 downwards, causing the arc-shaped block 13 to move in an arc shape along the arc groove of the support arm 7, with the drive wheel 8 as the center. This allows the screw to rest against the tops of the driven wheel 9 and the drive wheel 8. An arc-shaped rod 14 is fixedly installed at the bottom of the arc-shaped block 13, and a slider 15 is fixedly installed at the end of the arc-shaped rod 14 away from the arc-shaped block 13. An arc-shaped cavity is provided on the inner side of the support arm 7 to limit the sliding of the arc-shaped rod 14 and the slider 15. A first spring 16 is fixedly installed between the side of the slider 15 away from the arc-shaped rod 14 and the inner side of the arc-shaped cavity, so that when the arc-shaped block 13 moves, it can drive the arc-shaped rod 14 and the slider 15 to slide. Block 15 moves along the arc-shaped cavity of the support arm 7, causing the slider 15 to compress the first spring 16. The elasticity of the first spring 16 provides cushioning for the movement of the arc-shaped block 13. A first synchronous belt 17 is rotatably installed between one end of the driven wheel 9 and one end of the drive wheel 8, so that when the drive wheel 8 rotates, it can drive the two driven wheels 9 to rotate synchronously via the two first synchronous belts 17. The drive wheel 8, in conjunction with the two driven wheels 9, drives the screw to rotate. The outer sides of both the drive wheel 8 and the driven wheel 9 are made of rubber, and anti-slip grooves are provided on the outer sides of both the drive wheel 8 and the driven wheel 9 to increase the friction between them and the two ends of the screw. The arc-shaped block 13 has two sides... All are fixedly installed with positioning ribs, and the arc groove of the support arm 7 is provided with a positioning groove for the positioning ribs to slide in a limited manner, which improves the stability of the movement of the arc block 13 and prevents the arc block 13 from falling out of the arc groove. Both ends of the drive wheel 8 are rotatably installed with folding plates 32, and the folding plates 32 have a V-shaped structure. The end of the drive wheel 8 is located in the middle position of the folding plate 32. The two driven wheels 9 are rotatably installed at the two ends of the two folding plates 32 respectively, so that when the arc block 13 moves along the arc groove of the support arm 7, the driven wheels 9 can drive the end of the folding plate 32 to swing around the drive wheel 8, providing auxiliary support for the two ends of the driven wheels 9.

[0022] Example 2: Please refer to Figures 1-3This embodiment further illustrates Example 1. The adjusting mechanism shown in the figure includes a movable block 10 fixedly installed at the bottom of the material placement platform 6. The movable block 10 can adjust the position of the material placement platform 6. The adjusting mechanism also includes a counter-rotating screw 18 rotatably installed inside the material placement frame 5. Two movable blocks 10 are respectively threaded onto the two ends of the counter-rotating screw 18. Two optical shafts for limiting the sliding of the movable blocks 10 are fixedly installed inside the material placement frame 5. A handwheel 19 is fixedly installed at one end of the counter-rotating screw 18. When the handwheel 19 is rotated, it can drive the counter-rotating screw... Rotating rod 18 causes the counter-rotating screw 18 to drive two moving blocks 10 to move closer or further apart along the outer side of the optical axis, and causes the moving blocks 10 to drive the material placement platform 6 to move synchronously, realizing the position adjustment of the two material placement platforms 6, which is convenient for positioning screws of more sizes. Two symmetrically distributed fixed plates 20 are fixedly installed on the top of the device base 1. A prismatic rod 21 is rotatably installed between the two fixed plates 20. A sleeve 22 is rotatably installed on the inner side of the material placement platform 6. The inner side of the sleeve 22 has a prismatic structure, and the sleeve 22 is sleeved on the outer side of the prismatic rod 21. When the prismatic rod 21 rotates, it can drive the sleeve 22 to rotate synchronously. When the moving block 10 drives the material placement platform 6 to move, the sleeve 22 on the inner side of the material placement platform 6 can move along the outer side of the prismatic rod 21. A second synchronous belt 36 is rotatably installed between one end of the drive wheel 8 and the sleeve 22, so that the sleeve 22 can drive the drive wheel 8 to rotate through the second synchronous belt 36. A drive motor 23 is fixedly installed on the outer side of the fixing plate 20 on the left side of the device base 1, and the output end of the drive motor 23 is fixedly connected to one end of the prismatic rod 21, so that the drive motor... 23 can drive the prismatic rod 21 to rotate. A limiting cylinder 33 is fixedly installed on the outer side of the sleeve 22, and a limiting cavity for the installation of the limiting cylinder 33 is opened on the inner side of the material placement platform 6, so that the limiting cylinder 33 provides positioning for the sleeve 22, so that the sleeve 22 can move smoothly along the outer side of the prismatic rod 21 when the material placement platform 6 moves. A support platform 34 is fixedly installed on the top of the material placement frame 5, and the prismatic rod 21 and the anti-directional screw 18 are both rotatably installed on the inner side of the support platform 34, so that the support platform 34 provides support for the middle position of the prismatic rod 21 and the anti-directional screw 18.

[0023] Example 3: Please refer to Figures 1-8This embodiment further illustrates other embodiments. The fixed angle mechanism shown in the figure includes a limiting block 11 slidably mounted on the inner side of the support arm 7. The limiting block 11 can lock the swing angle of the support arm 7. The fixed angle mechanism also includes a mounting frame 24 fixedly mounted on the outer side of the limiting block 11. The inner side of the support arm 7 has a mounting cavity for the mounting frame 24 and the limiting block 11 to slide and limit each other. The top of the limiting block 11 has a sloping structure, and the outer side of the arc-shaped rod 14 has a plurality of equally spaced slots for the limiting block 11 to be inserted and limited. A second spring 25 is fixedly mounted between the side of the mounting frame 24 away from the limiting block 11 and the inner side of the mounting cavity. The arc-shaped rod 14 moves downward. When the slot pushes the inclined surface of the limiting block 11, the limiting block 11 drives the mounting frame 24 to move along the mounting cavity of the support arm 7, compressing the second spring 25. When the arc rod 14 stops moving, the rebound force of the second spring 25 pushes the mounting frame 24 to move, so that the mounting frame 24 inserts the limiting block 11 into the slot of the arc rod 14, thereby positioning the arc rod 14. This allows for the quick insertion of the next screw of the same size after the current screw inspection is completed. A stop block 26 is fixedly installed on the inner side of the mounting frame 24, and a push rod 27 is slidably installed between two adjacent support arms 7. Two sliding push rods 27 are fixedly installed on the outer side of the push rod 27. Push blocks 28 are installed inside the two mounting frames 24. The outer side of push blocks 28 contacts the outer side of stop blocks 26, and the contact surfaces of push blocks 28 and stop blocks 26 are both inclined structures. Two protruding rings 29 are fixedly installed on the outer side of push rod 27, and a third spring 30 is fixedly installed between the protruding rings 29 and the outer side of support arm 7. Two stop rods 31 are fixedly installed on the side of fixing plate 20 near push rod 27, and the two stop rods 31 are respectively on the same horizontal line as the two push rods 27. When the material placement table 6 moves and resets towards the fixing plate 20, one end of push rod 27 can contact the end of stop rod 31, so that stop rod 31 abuts against push rod 27. Push rod 27 passes through the protruding rings 29 and stops the push rod 27. Ring 29 compresses the third spring 30 and drives the push block 28 to move along the inclined surface of the stop block 26, so that the push block 28 pushes the mounting frame 24 to move through the stop block 26. The mounting frame 24 can then move the limiting block 11 away from the arc rod 14, thereby unlocking the arc rod 14 and facilitating the first spring 16 to push the arc rod 14 to reset. The inner side of the second spring 25 is fitted with a support rod 35, which is fixedly installed on the outer side of the mounting frame 24. The support rod 35 slides through the support arm 7, so that the mounting frame 24 can drive the support rod 35 to move synchronously. The support rod 35 can provide auxiliary support for the second spring 25 and prevent the second spring 25 from bending during compression.

[0024] Working principle: First, the operator rotates handwheel 19, which in turn rotates counter-rotating screw 18. This causes the counter-rotating screw 18 to move two moving blocks 10 closer together along the outer edge of the optical axis. The two moving blocks 10 then move the two material placement platforms 6 synchronously. The distance between the two material placement platforms 6 is adjusted according to the size of the screw to be tested. Then, the operator places both ends of the screw above the two material placement platforms 6, so that the ends of the screw contact the two driven wheels 9 on the top of the material placement platforms 6. The weight of the screw pushes the driven wheels 9 downwards. Driven by the driven wheel 9, the arc-shaped block 13 moves in an arc shape along the arc groove of the support arm 7, with the drive wheel 8 as the fulcrum. The arc-shaped block 13 drives the arc-shaped rod 14 and the slider 15 to move along the arc cavity of the support arm 7, causing the slider 15 to compress the first spring 16. The elasticity of the first spring 16 provides a buffer for the movement of the arc-shaped block 13. At the same time, the arc-shaped rod 14 pushes the inclined surface of the limiting block 11 through the slot. The limiting block 11 drives the mounting frame 24 to move along the mounting cavity of the support arm 7, causing the mounting frame 24 to compress the second spring 25. When the arc-shaped rod 14 stops moving, the rebound force of the second spring 25 pushes the mounting frame 24 to move, causing the mounting frame 24 to insert the limiting block 11 into the slot of the arc-shaped rod 14, thus positioning the arc-shaped rod 14. Then, the operator starts the drive motor 23, which drives the prismatic rod 21 to rotate, causing the prismatic rod 21 to drive the two sleeves 22 to rotate. The sleeves 22 drive the drive wheel 8 to rotate via the second synchronous belt 36. The drive wheel 8 drives the two driven wheels 9 to rotate synchronously via the two first synchronous belts 17. Wheel 8 and the two driven wheels 9 can drive the screw to rotate. At the same time, the electric slide 3 drives the optical inspection probe 4 to move laterally, so that the optical inspection probe 4 can perform visual inspection of surface defects on the rotating screw. Finally, the operator takes out the screw that has been inspected. Since the limiting block 11 is pressed against the slot of the arc-shaped rod 14, it keeps the arc-shaped rod 14 locked. The operator can then place the next screw of the same size on the drive wheel 8 and the driven wheel 9 in time, so as to facilitate the timely inspection of the next screw, thereby achieving the effect of comprehensive inspection.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual inspection device for screw surface defects in screw compressor manufacturing, characterized in that, include: The device base (1) and the gantry frame (2) installed on the top of the device base (1) are equipped with an electric slide (3) on the outside of the gantry frame (2) and an optical detection probe (4) on the outside of the electric slide (3). A material placement frame (5) is installed on the top of the device base (1). Two symmetrically distributed material placement platforms (6) are provided on the top of the material placement frame (5). Four symmetrically distributed support arms (7) are installed on the top of the material placement platform (6). A drive wheel (8) is installed on the top of the material placement platform (6). Also includes: A fixed rod mechanism is used to position and rotate the screw. The fixed rod mechanism is installed on the top of the gantry (2) and the material placement platform (6). The fixed rod mechanism includes two driven wheels (9) symmetrically arranged on the top of the material placement platform (6). The driven wheels (9) can cooperate with the drive wheel (8) to provide auxiliary support for the screw. An adjusting mechanism is used to adjust the distance between the two material placement platforms (6). The adjusting mechanism is installed at the bottom of the material placement platform (6). The adjusting mechanism includes a movable block (10) fixedly installed at the bottom of the material placement platform (6). The movable block (10) can adjust the position of the material placement platform (6). An angle-fixing mechanism is used to lock the angle of the support arm (7). The angle-fixing mechanism is installed on the inner side of the support arm (7). The angle-fixing mechanism includes a limiting block (11) that is slidably installed on the inner side of the support arm (7). The limiting block (11) can lock the swing angle of the support arm (7).

2. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 1, characterized in that: The fixed rod mechanism also includes two positioning plates (12) symmetrically fixedly installed on the top of the material placement platform (6). The drive wheel (8) is rotatably installed between the two positioning plates (12), and the driven wheel (9) is rotatably installed between two adjacent support arms (7). The support arm (7) has an arc-shaped structure, and the center of the support arm (7) is the same as the center of the drive wheel (8). Arc-shaped blocks (13) are rotatably installed at both ends of the driven wheel (9). The outer side of the support arm (7) is provided with a space for the drive wheel (8) to pass through. The arc-shaped block (13) has an arc-shaped groove for limiting sliding. An arc-shaped rod (14) is fixedly installed at the bottom of the arc-shaped block (13). A slider (15) is installed at one end of the arc-shaped rod (14). An arc-shaped cavity is opened on the inner side of the support arm (7) for limiting sliding between the arc-shaped rod (14) and the slider (15). A first spring (16) is installed between the slider (15) and the inner side of the arc-shaped cavity. A first synchronous belt (17) is rotatably installed between one end of the driven wheel (9) and one end of the driving wheel (8).

3. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 2, characterized in that: The adjusting mechanism further includes a counter-rotating screw (18) rotatably mounted inside the material placement frame (5), two moving blocks (10) being threaded onto both ends of the counter-rotating screw (18), and two optical shafts for limiting the sliding of the moving blocks (10) being installed inside the material placement frame (5). A handwheel (19) is installed at one end of the counter-rotating screw (18), and two fixing plates (20) are installed on the top of the device base (1). A prism rod (21) is rotatably mounted between the two fixing plates (20). A sleeve (22) is rotatably installed on the inner side of the material placement platform (6). The inner side of the sleeve (22) is a prismatic structure, and the sleeve (22) is sleeved on the outer side of the prismatic rod (21). A second synchronous belt (36) is rotatably installed between one end of the drive wheel (8) and the sleeve (22). A drive motor (23) is installed on the outer side of the fixing plate (20) located on the left side of the device base (1), and the output end of the drive motor (23) is fixedly connected to one end of the prismatic rod (21).

4. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 3, characterized in that: The fixed angle mechanism also includes a mounting frame (24) installed on the outside of the limiting block (11). The inner side of the support arm (7) is provided with a mounting cavity for the mounting frame (24) and the limiting block (11) to slide and limit each other. The top of the limiting block (11) is a sloping structure, and the outer side of the arc rod (14) is provided with multiple slots for the limiting block (11) to be inserted and limited. A second spring (25) is installed between one side of the mounting frame (24) and the inner side of the mounting cavity. A stop block (26) is installed on the inner side of the mounting frame (24). The two adjacent support arms (7) slide and connect. The push rod (27) is equipped with two push blocks (28) that are slidably mounted on the outside of the two mounting frames (24). The outside of the push blocks (28) is in contact with the outside of the stop block (26), and the contact surfaces of the push blocks (28) and the stop block (26) are both inclined surfaces. The outside of the push rod (27) is equipped with two protruding rings (29), and a third spring (30) is installed between the protruding rings (29) and the outside of the support arm (7). The fixing plate (20) is fixedly equipped with two stop rods (31) on the side near the push rod (27).

5. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 1, characterized in that: The outer sides of both the drive wheel (8) and the driven wheel (9) are made of rubber, and anti-slip grooves are provided on the outer sides of both the drive wheel (8) and the driven wheel (9).

6. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 2, characterized in that: Positioning ribs are installed on both sides of the arc-shaped block (13), and a positioning groove is provided in the arc-shaped groove of the support arm (7) for the positioning ribs to slide in a limited manner.

7. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 2, characterized in that: Folding plates (32) are rotatably mounted on both ends of the drive wheel (8). The end of the drive wheel (8) is located in the middle of the folding plate (32). The two driven wheels (9) are rotatably mounted on both ends of the two folding plates (32).

8. The visual inspection device for screw surface defects in screw mill manufacturing according to claim 3, characterized in that: A limiting cylinder (33) is installed on the outer side of the sleeve (22), and a limiting cavity for the installation of the limiting cylinder (33) is opened on the inner side of the material placement platform (6).

9. A visual inspection device for screw surface defects in screw mill manufacturing according to claim 3, characterized in that: The top of the material placement frame (5) is equipped with a support platform (34), and the prism rod (21) and the opposite screw (18) are both rotatably installed on the inside of the support platform (34).

10. A visual inspection device for screw surface defects in screw mill manufacturing according to claim 4, characterized in that: The second spring (25) is fitted with a support rod (35) on its inner side. The support rod (35) is installed on the outer side of the mounting frame (24) and slides through the support arm (7).

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