Injection molding demolding structure for cylindrical net-shaped workpiece

Abstract

The invention discloses an injection molding demolding structure for a cylindrical net-shaped workpiece, and relates to a waste workpiece injection molding technology, the injection molding demolding structure comprises an injection mold body and a waste workpiece body formed by processing waste plastic through the injection mold body; wherein a bearing platform is arranged below the injection mold body, and the bearing platform is used for loading and positioning the injection mold body; a positioning mechanism is arranged above the bearing platform, and the positioning mechanism comprises a positioning bottom plate; a demolding mechanism is arranged on the right side of the bearing platform and comprises a demolding outer frame. According to the injection molding demolding structure for the cylindrical net-shaped workpiece, a demolding sliding rod of the demolding outer frame drives a waste workpiece body obtained after a defective workpiece is reformed to be separated from an injection mold body, stripping is achieved through a positioning transverse plate, and meanwhile a material taking overturning frame drives the waste workpiece body to be overturned to be in an inclined state on an abutting arc plate; and the material taking convenience and efficiency after recycling and forming are improved.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology for waste workpieces, specifically to an injection molding demolding structure for cylindrical mesh workpieces. Background Technology

[0002] Cylindrical mesh workpieces are a type of injection-molded product. They are shaped according to actual usage requirements, usually by injection molds. Molten material is transported into the mold and formed into a specific shape through the mold cavity before cooling and demolding. In current production operations, there are often defective or substandard plastic workpieces in different processes. These defective workpieces are also remelted and re-injected and demolded, thereby reducing the waste of raw materials.

[0003] The utility model with announcement number CN222156502U discloses a demolding mechanism for injection molding of irregular workpieces. It only requires opening corresponding circular through holes according to the shape of the workpiece, and then matching different numbers of ejector rods. This avoids the problem of fixing the number and position of ejector rods, which would not be able to meet the ejection work of irregular workpieces. It can also reduce the high cost of designing demolding mechanisms for different irregular workpieces. When the air force of the active fan blade and the driven fan blade blows downward, the air force can be blown to the part of the ejector rod that contacts the finished product through the ejector rod and other components, thereby accelerating cooling and avoiding deformation caused by insufficient hardness of the contact part due to excessive temperature during demolding.

[0004] The utility model disclosed in CN217073238U is a workpiece demolding auxiliary structure for injection molds. The structure is driven by a motor to rotate a lead screw, which in turn drives a sliding plate to move. A cylinder drives the horizontal and vertical plates to move up and down, and pneumatic suction cups hold the upper surface of the molded part. This allows for demolding and unloading of the molded part, reducing demolding difficulty and achieving automatic unloading, thus improving processing efficiency. Four pneumatic suction cups apply a uniform pulling force to the molded part to prevent damage.

[0005] However, the demolding mechanism disclosed above for injection molding of workpieces still has the following problems in actual use: the workpiece is demolded by the assistance of the unloading mechanism, but the contact area between the unloading mechanism and the workpiece is too small, which makes the workpiece susceptible to deformation after being subjected to force. Also, if the unloading is not completely cooled, it is easy for the workpiece to stick to the unloading mechanism, making it difficult to separate from the unloading mechanism.

[0006] Therefore, we propose an injection molding demolding structure for cylindrical mesh workpieces to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide an injection molding demolding structure for cylindrical mesh workpieces. This addresses the problem that existing workpieces are demolded using a feeding mechanism assisted by an injection molding mechanism, but the contact area between the feeding mechanism and the workpiece is too small, which makes the workpiece susceptible to deformation under stress. Furthermore, feeding the workpiece before it has fully cooled down can cause it to stick to the feeding mechanism, making it difficult to separate from it.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an injection molding demolding structure for cylindrical mesh workpieces, comprising an injection mold body and a waste workpiece body formed by processing waste plastic through the injection mold body; The injection mold body includes a support platform located below it, which is used to load and position the injection mold body; it also includes: A positioning mechanism is provided above the bearing platform, and the positioning mechanism includes a positioning base plate, and positioning cross plates are provided on both the left and right sides inside the positioning base plate. A demolding mechanism is provided on the right side of the bearing platform. The demolding mechanism includes a demolding frame, and a demolding slide rod is slidably provided inside the demolding frame. The demolding slide rod is inserted into the body of the waste workpiece and is separated from the injection mold body. The positioning mechanism includes a material-picking and flipping frame, and the left end of the material-picking and flipping frame is rotatably mounted on the outside of the left end of the left positioning horizontal plate via a torsion spring. The right end of the material-picking and flipping frame is fixedly provided with pressing arc plates at equal intervals. The pressing arc plates are distributed correspondingly to the snap-fit ​​arc grooves opened inside the positioning horizontal plate. At the same time, the elastic force of the torsion spring is greater than the weight of the material-picking and flipping frame and the waste workpiece body. This is used to drive the waste workpiece body to rotate upward and tilt in an inclined state after it is separated from the demolding slide bar, so as to facilitate material picking.

[0009] Preferably, the positioning mechanism includes a positioning base plate fixedly installed above the top surface of the bearing platform, and the inner side of the top surface of the symmetrically distributed positioning cross plates is provided with a snap-fit ​​arc groove, which is used to snap and position the outer end of the waste workpiece body.

[0010] Preferably, the positioning mechanism includes a positioning sleeve, and a positioning slide rod is slidably disposed inside the positioning sleeve. The left end of the positioning slide rod is connected to the positioning sleeve by a return spring, and the upper part of the positioning slide rod is fixedly connected to the bottom end of the contact arc plate.

[0011] Preferably, the upper end of the abutting arc plate included in the positioning mechanism is disposed above the outside of the positioning sleeve, and the outer wall of the abutting arc plate is attached to the inner wall of the waste workpiece body, and the inner wall of the pressing arc plate at the right end of the material taking and turning frame is attached to the outer wall of the demolding slide rod, and the material taking and turning frame in the initial state drives the positioning sleeve and the positioning slide rod above to be distributed in an inclined structure. The positioning mechanism includes a material-picking and flipping frame that contacts the left end of the demolding slide rod via a pressing arc plate at the right end. The elastic tension of the return spring is less than the traction force of the positioning slide rod and the pressing arc plate, causing the tilted positioning slide rod and the pressing arc plate to slide downwards. When the material-picking and flipping frame rotates downwards, the return spring overcomes the traction force of the positioning slide rod and the pressing arc plate, causing the positioning slide rod and the pressing arc plate to slide to the right.

[0012] Preferably, the demolding mechanism includes a demolding frame fixedly installed on the right end of the positioning base plate, and lifting cylinders are fixedly installed on both the front and rear sides of the left end of the demolding frame, and the lower telescopic part of the lifting cylinder is connected to the carrier plate below the positioning base plate.

[0013] Preferably, the demolding mechanism includes a demolding cylinder, which is fixedly installed at the right end of the demolding frame. A transmission slider is slidably installed inside the demolding frame and is fixedly connected to the left telescopic part of the demolding cylinder. The transmission slider is also fixedly connected to the right end of the demolding slide rod.

[0014] Preferably, the demolding mechanism includes a demolding air box, which is fixedly installed on the top left side of the demolding frame. A sealing plug is elastically slidably installed inside the right side of the demolding air box, and the right end of the sealing plug slides through a contact transmission slider to achieve air extraction inside the demolding air box. Meanwhile, a one-way exhaust valve is provided on the left side of the demolding air box.

[0015] Preferably, the demolding mechanism includes demolding air holes, which are opened at equal angles on the inner wall of the demolding slide bar. The left side of the demolding air box is connected to the left end of the elastic air supply hose, and the right end of the elastic air supply hose is fixedly connected to the top surface of the transmission slider and is connected to the demolding slide bar which is set at equal distances.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The cylindrical mesh workpiece uses an injection molding demolding structure. Through the demolding slide bar of the demolding frame, the waste workpiece body after remolding is separated from the injection mold body, and the material is removed by the positioning horizontal plate. Simultaneously, the material-retrieving and flipping frame, at the contact arc plate, flips the waste workpiece body to an inclined state, improving the convenience and efficiency of material retrieval after recycling and molding. The specific details are as follows: 1. The lifting cylinder on the side of the demolding frame operates, causing the demolding frame and demolding slide to slide upwards, corresponding to the waste workpiece body. The demolding cylinder then moves the demolding slide, inserting it into the interior of the waste workpiece body. The retraction of the lifting cylinder causes the demolding frame to move downwards, distributing the inserted waste workpiece body and the injection mold body together.

[0017] 2. When the transmission slider inside the demolding frame moves the demolding slide bar to the left, the transmission slider squeezes the sealing plug plate outside the demolding air box, causing it to move into the demolding air box. This allows air to be delivered to the demolding slide bar through the through-connected elastic air supply hose and sprayed outward through the demolding air hole. This helps to cool the workpiece when it comes into contact with it, preventing it from sticking during subsequent separation.

[0018] 3. When the demolding slide rod moves the waste workpiece body downward, it first contacts the pressing arc plate on the left side of the positioning base plate through its left end. After the pressing arc plate and the material taking flip frame rotate downward synchronously, the positioning sleeve and the positioning slide rod above the material taking flip frame are in a horizontal state. The elastic force of the return spring is greater than the weight of the positioning slide rod and the contact arc plate, which in turn drives the positioning slide rod and the contact arc plate to slide to the right, so that the contact arc plate moves into the interior of the waste workpiece body.

[0019] Furthermore, the demolding slide bar lowers the waste workpiece body into the interior of the positioning base plate, and limits the waste workpiece body through the locking arc grooves on the inner side of the positioning horizontal plates on both sides. Thus, when the demolding slide bar moves to the right, the waste workpiece body is limited by the locking arc grooves and does not move with it, so as to separate from the demolding slide bar and complete the demolding.

[0020] 4. After the demolding slide bar is completely separated from the waste workpiece body, the pressing arc plate is no longer resisted by the pressure of the demolding slide bar. Instead, the torsion spring drives the material taking and turning frame and the pressing arc plate to rotate upward, so that the pressing arc plate drives the inserted waste workpiece body to rotate synchronously to the tilted state.

[0021] Furthermore, the weight of the positioning slide rod in the tilted state is greater than the force of the return spring, causing it to slide downwards. At the same time, the tilted waste workpiece body moves downwards synchronously due to gravity, so as to fit over the outside of the contact arc plate and prevent the waste workpiece body from falling off.

[0022] Furthermore, when the waste workpiece is tilted, the gravitational potential energy generates a reverse traction force, thereby increasing the friction force to prevent it from falling off the contact arc plate. This ensures that the waste workpiece will not detach on its own, improving the convenience and efficiency of material retrieval after recycling and molding. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the positioning base plate of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4This is a schematic diagram of the structure of the waste workpiece body and the demolding slide bar of the present invention. Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the structure of the waste workpiece body after it is separated from the demolding slide bar according to the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point C; Figure 8 This is a schematic diagram of the structure of the positioning slide rod after it slides against the contact arc plate according to the present invention; Figure 9 This is a three-dimensional structural diagram of the demolding frame of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point D.

[0024] In the diagram: 1. Injection mold body; 2. Scrap workpiece body; 3. Supporting platform; 4. Positioning base plate; 5. Positioning horizontal plate; 6. Demolding frame; 7. Demolding slide bar; 8. Snap-fit ​​arc groove; 9. Material picking and flipping frame; 10. Pressing arc plate; 11. Positioning sleeve; 12. Positioning slide bar; 13. Return spring; 14. Contact arc plate; 15. Torsion spring; 16. Lifting cylinder; 17. Demolding cylinder; 18. Transmission slider; 19. Demolding air box; 20. Sealing plug plate; 21. Demolding air hole; 22. Elastic air supply hose; 23. One-way exhaust valve. Detailed Implementation

[0025] 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.

[0026] Please see Figures 1-10 The present invention provides the following technical solution: Example 1: In order to solve the problems existing in the demolding of waste workpieces, this example discloses the following technical solution: an injection molding demolding structure for cylindrical mesh workpieces, including an injection mold body 1 and a waste workpiece body 2 formed by processing waste plastic through the injection mold body 1; wherein, a support platform 3 is provided below the injection mold body 1, and the support platform 3 is used to load and position the injection mold body 1; a positioning mechanism is provided above the support platform 3, and the positioning mechanism includes a positioning base plate 4.

[0027] A demolding mechanism is provided on the right side of the support platform 3. The demolding mechanism includes a demolding frame 6, and a demolding slide rod 7 is slidably installed inside the demolding frame 6. The demolding slide rod 7 is inserted into the waste workpiece body 2 and is separated from the injection mold body 1. The demolding frame 6 is fixedly installed on the right end of the positioning base plate 4. Lifting cylinders 16 are fixedly installed on both the front and rear sides of the left end of the demolding frame 6. The lower telescopic part of the lifting cylinder 16 is connected to the carrier plate below the positioning base plate 4. The demolding mechanism includes a demolding cylinder 17, which is fixedly installed on the right end of the demolding frame 6. A transmission slider 18 is slidably installed inside the demolding frame 6. The transmission slider 18 is fixedly connected to the left telescopic part of the demolding cylinder 17 and the right end of the demolding slide rod 7.

[0028] like Figures 1-2 As shown, the lifting cylinder 16 on the outside of the demolding frame 6 is connected to the oil pump and then operates. The telescopic part at its lower end moves downward, thereby driving the demolding frame 6, the demolding slide rod 7, and the demolding cylinder 17 to move upward, so that the demolding slide rod 7, which is distributed at equal distances, and the waste workpiece body 2 inside the injection mold body 1 are distributed in a concentric state. Then, the demolding cylinder 17 connected to the oil pump drives the transmission slider 18 inside the demolding frame 6 to slide through the telescopic part. The transmission slider 18 drives the demolding slide rod 7, which is fixedly connected at equal distances on the left end, to slide to the left so that the demolding slide rod 7 can be inserted into the inside of the waste workpiece body 2. Then, the telescopic part of the lifting cylinder 16 retracts again, driving the demolding frame 6 and the demolding slide rod 7 to slide downward, so that the demolding slide rod 7 drives the inserted waste workpiece body 2 to descend synchronously into the inside of the positioning base plate 4.

[0029] Example 2: To solve the problems existing in the demolding of scrap workpieces, this example discloses the following technical solution: The demolding mechanism includes a demolding air box 19, which is fixedly installed on the top left side of the demolding frame 6. A sealing plug plate 20 is elastically slidably installed inside the right side of the demolding air box 19, and the right end of the sealing plug plate 20 slides by abutting the transmission slider 18. Air is pumped out by sliding inside the demolding air box 19. At the same time, a one-way exhaust valve 23 is provided on the left side of the demolding air box 19. The demolding mechanism includes a demolding air hole 21, which is opened at an angle on the inner wall of the demolding slide bar 7. The left side of the demolding air box 19 is connected to the left end of the elastic air supply hose 22, and the right end of the elastic air supply hose 22 is fixedly connected to the top surface of the transmission slider 18 and is connected to the demolding slide bar 7 which is set at equal distances.

[0030] like Figures 9-10As shown, when the transmission slider 18 inside the demolding frame 6 drives the demolding slide bar 7 to move to the left, the transmission slider 18 contacts the sealing plug plate 20 on the right side of the demolding air box 19, and drives the sealing plug plate 20 to move to the left into the demolding air box 19. The air inside the demolding air box 19 is supplied to the demolding slide bar 7 through the through-connected elastic air supply hose 22. The demolding slide bar 7 sprays air out through the demolding air holes 21 opened at equal angles, so that it can be cooled by the sprayed air after entering the waste workpiece body 2, reducing the possibility of the demolding slide bar 7 sticking to the waste workpiece body 2 and improving the efficiency of subsequent separation.

[0031] Example 3: To solve the problems existing in the demolding of scrap workpieces, this example discloses the following technical solution: Positioning base plate 4 is provided with positioning horizontal plates 5 on both the left and right sides inside; the positioning mechanism includes positioning base plate 4 fixedly installed above the top surface of bearing platform 3, and the inner side of the top surface of the symmetrically distributed positioning horizontal plates 5 is provided with snap-fit ​​arc grooves 8, which are used to snap-fit ​​and position the outer end of scrap workpiece body 2; the positioning mechanism includes a material picking and turning frame 9, and the left end of the material picking and turning frame 9 is rotatably installed on the outside of the left end of the left positioning horizontal plate 5 through torsion spring 15, and the right end of the material picking and turning frame 9 is fixedly provided with pressing arc plates 10 at equal distances, and the pressing arc plates 10 are correspondingly distributed with the snap-fit ​​arc grooves 8 opened inside the positioning horizontal plate 5. At the same time, the elastic force of torsion spring 15 is greater than the weight of material picking and turning frame 9 and scrap workpiece body 2, which is used to drive scrap workpiece body 2 to rotate upward and tilt in an inclined state after the scrap workpiece body 2 is separated from the demolding slide bar 7, so as to facilitate material picking.

[0032] The positioning mechanism includes a positioning sleeve 11, and a positioning slide rod 12 is slidably provided inside the positioning sleeve 11. The left end of the positioning slide rod 12 is connected to the positioning sleeve 11 by a return spring 13. The upper end of the positioning slide rod 12 is fixedly connected to the bottom end of the contact arc plate 14. The upper end of the contact arc plate 14 included in the positioning mechanism is provided outside the upper part of the positioning sleeve 11. The outer wall of the contact arc plate 14 is attached to the inner wall of the waste workpiece body 2. The inner wall of the pressing arc plate 10 at the right end of the material taking and turning frame 9 is attached to the outer wall of the demolding slide rod 7. In the initial state, the material taking and turning frame 9 drives the upper positioning sleeve 11 and the positioning slide rod 12 to be distributed in an inclined structure. The positioning mechanism includes a material-picking and flipping frame 9 which contacts the left end of the demolding slide bar 7 via the pressing arc plate 10 at the right end. The elastic tension of the return spring 13 is less than the traction force of the weight of the positioning slide bar 12 and the contact arc plate 14, causing the tilted positioning slide bar 12 and the contact arc plate 14 to slide downwards. When the material-picking and flipping frame 9 rotates downwards, the return spring 13 overcomes the traction force of the weight of the positioning slide bar 12 and the contact arc plate 14, causing the positioning slide bar 12 and the contact arc plate 14 to slide to the right.

[0033] like Figures 2-5 As shown, when the demolding outer frame 6 drives the demolding slide bar 7 to slide downwards with the inserted waste workpiece body 2, the left end of the demolding slide bar 7 first contacts the pressing arc plate 10 above the left positioning horizontal plate 5, and drives the pressing arc plate 10 and the material taking flipping frame 9 to rotate downwards so as to fit against the upper part of the positioning horizontal plate 5. The descending demolding slide bar 7 then drives the waste workpiece body 2 into the snap-fit ​​arc groove 8 opened inside the positioning horizontal plate 5, thereby positioning the waste workpiece body 2 for subsequent separation.

[0034] Furthermore, when the material handling and flipping frame 9 rotates downward, it drives the positioning sleeve 11 and the positioning slide rod 12 to move synchronously. At this time, the elastic force of the return spring 13 is greater than the self-weight force of the positioning slide rod 12 in the lateral state. This allows the return spring 13 to extend and drive the positioning slide rod 12 and the abutting arc plate 14 above it to move synchronously to the right. This allows the abutting arc plate 14 to enter the upper part of the waste workpiece body 2, thereby positioning the waste workpiece body 2. The pressing arc plate 10 and the abutting arc plate 14 form an internal symmetrical clamping effect on the waste workpiece body 2.

[0035] like Figures 6-8 As shown, when the demolding slide bar 7 inside the demolding frame 6 separates from the scrap workpiece body 2, the scrap workpiece body 2 is positioned by the snap-fit ​​arc groove 8 inside the positioning horizontal plate 5, so that the moving demolding slide bar 7 will not drive the scrap workpiece body 2 to move synchronously. After the demolding slide bar 7 is completely separated from the scrap workpiece body 2, the pressing arc plate 10 at the right end of the material taking and turning frame 9 is no longer pressed by the demolding slide bar 7, and then rotates upward through the torsion spring 15. The material taking and turning frame 9 drives the pressing arc plate 10, the positioning sleeve 11, the positioning slide bar 12, the contact arc plate 14 and the scrap workpiece body 2 to rotate synchronously. At this time, the return spring 13 springs back to its original position. Although the force exerted by the positioning slide rod 12 is less than the weight of the positioning slide rod 12, causing the positioning slide rod 12 to slide downwards along the contact arc plate 14, the inclined waste workpiece body 2 will also slide synchronously due to its inclined state, further fitting onto the outer wall of the contact arc plate 14 and the pressing arc plate 10. At the same time, because the contact arc plate 14 and the pressing arc plate 10 are synchronously attached to the inner wall of the waste workpiece body 2, when the waste workpiece body 2 tilts, it will generate a reverse traction force due to gravitational potential energy, thereby increasing the friction force to prevent separation from the contact arc plate 14, thus ensuring that the waste workpiece body 2 will not fall off on its own, improving the convenience and efficiency of material retrieval after recycling and molding.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection molding demolding structure for a cylindrical mesh workpiece, comprising an injection mold body (1) and a waste workpiece body (2) formed by processing waste plastic through the injection mold body (1). in, A support platform (3) is provided below the injection mold body (1), and the support platform (3) is used to load and position the injection mold body (1); Its characteristic is that it further includes: A positioning mechanism is provided above the bearing platform (3), and the positioning mechanism includes a positioning base plate (4), and positioning horizontal plates (5) are provided on both the left and right sides inside the positioning base plate (4). The right side of the bearing platform (3) is provided with a demolding mechanism, and the demolding mechanism includes a demolding frame (6), and a demolding slide rod (7) is slidably provided inside the demolding frame (6), and the demolding slide rod (7) is inserted into the inside of the waste workpiece body (2) and separated from the injection mold body (1); The positioning mechanism includes a material picking and turning frame (9), and the left end of the material picking and turning frame (9) is rotatably installed on the outside of the left end of the left positioning horizontal plate (5) by a torsion spring (15). The right end of the material picking and turning frame (9) is fixedly provided with a pressing arc plate (10) at equal distances. The pressing arc plate (10) and the snap-fit ​​arc groove (8) opened inside the positioning horizontal plate (5) are distributed accordingly. At the same time, the elastic force of the torsion spring (15) is greater than the weight of the material picking and turning frame (9) and the waste workpiece body (2). After the waste workpiece body (2) is separated from the demolding slide bar (7), it drives the waste workpiece body (2) to rotate upward and tilt to facilitate material picking.

2. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 1, characterized in that: The positioning mechanism includes a positioning base plate (4) which is fixedly installed above the top surface of the bearing platform (3), and the inner side of the top surface of the symmetrically distributed positioning cross plates (5) is provided with a snap-fit ​​arc groove (8), which is used to snap-fit ​​and position the outer end of the waste workpiece body (2).

3. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 1, characterized in that: The positioning mechanism includes a positioning sleeve (11), and a positioning slide rod (12) is slidably provided inside the positioning sleeve (11). The left end of the positioning slide rod (12) is connected to the positioning sleeve (11) by a return spring (13), and the upper part of the positioning slide rod (12) is fixedly connected to the bottom end of the contact arc plate (14).

4. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 3, characterized in that: The positioning mechanism includes an upper end of an abutting arc plate (14) that extends through the upper exterior of the positioning sleeve (11), and the outer wall of the abutting arc plate (14) is attached to the inner wall of the waste workpiece body (2), and the inner wall of the pressing arc plate (10) at the right end of the material taking and turning frame (9) is attached to the outer wall of the demolding slide bar (7), and the material taking and turning frame (9) in the initial state drives the upper positioning sleeve (11) and positioning slide bar (12) to be distributed in an inclined structure. The positioning mechanism includes a material-picking and flipping frame (9) which contacts the left end of the demolding slide bar (7) through the pressing arc plate (10) at the right end. The elastic tension of the return spring (13) is less than the traction force of the weight of the positioning slide bar (12) and the contact arc plate (14), so that the tilted positioning slide bar (12) and the contact arc plate (14) slide downward. When the material-picking and flipping frame (9) rotates downward, the return spring (13) overcomes the traction force of the weight of the positioning slide bar (12) and the contact arc plate (14), causing the positioning slide bar (12) and the contact arc plate (14) to slide to the right.

5. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 1, characterized in that: The demolding mechanism includes a demolding frame (6) which is fixedly installed on the right end of the positioning base plate (4), and lifting cylinders (16) are fixedly installed on both the front and rear sides of the left end of the demolding frame (6), and the lower end extension part of the lifting cylinder (16) is connected to the carrier plate below the positioning base plate (4).

6. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 5, characterized in that: The demolding mechanism includes a demolding cylinder (17), which is fixedly installed on the right end of the demolding frame (6). A transmission slider (18) is slidably installed inside the demolding frame (6), and the transmission slider (18) is fixedly connected to the left end extension part of the demolding cylinder (17). At the same time, the transmission slider (18) is fixedly connected to the right end of the demolding slide bar (7).

7. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 1, characterized in that: The demolding mechanism includes a demolding air box (19), and the demolding air box (19) is fixedly installed on the top left side of the demolding frame (6). A sealing plug plate (20) is elastically slidably installed inside the right side of the demolding air box (19). The right end of the sealing plug plate (20) slides through the abutting transmission slider (18) to achieve air extraction inside the demolding air box (19). At the same time, a one-way exhaust valve (23) is provided on the left side of the demolding air box (19).

8. The injection molding demolding structure for a cylindrical mesh workpiece according to claim 7, characterized in that: The demolding mechanism includes a demolding air hole (21), and the demolding air hole (21) is opened at an angle on the inner wall of the demolding slide bar (7). The left side of the demolding air box (19) is connected to the left end of the elastic air supply hose (22), and the right end of the elastic air supply hose (22) is fixedly connected to the top surface of the transmission slider (18) and is connected to the demolding slide bar (7) which is set at equal distances.

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