Accurate positioning structure of mould pressing lifting equipment

Abstract

The invention relates to the technical field of mold pressing production, and discloses a mold pressing lifting equipment precise positioning structure which comprises a main frame and a lower mold, a sliding column and a first hydraulic cylinder are fixedly connected to the inner top wall of the main frame, an upper mold is slidably connected to the outer wall of the sliding column, and the output end of the first hydraulic cylinder is fixedly connected to the upper end face of the upper mold; the upper end face of the upper mold is fixedly connected with a sliding block, the inner top wall of the main frame is fixedly connected with an air chamber shell, the outer wall of the sliding block is slidably connected to the inner wall of the air chamber shell, the outer wall of the air chamber shell is fixedly connected with a first air pipe, the first air pipe communicates with an air conveying pipe, and the air conveying pipe is fixedly connected to the outer wall of the lower mold. And the outer wall of the gas conveying pipe is fixedly connected with a spray head. When the upper die ascends, the sliding block is driven to slide in the air chamber shell, compressed air is blown out of the spray head through the first air pipe and the air conveying pipe, the surface of the lower die is automatically purged and cleaned, residual waste is effectively removed, manual intervention is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of molding production technology, specifically to a precise positioning structure for a molding lifting device. Background Technology

[0002] Compression molding, a widely used plastic processing method, is commonly used in the production of products made of rubber, plastics, carbon fiber composites, and glass fiber composites. In this field, the compression molding lifting equipment is the core equipment. It uses hydraulic or mechanical power to open and close the upper and lower molds, heating and pressurizing the raw material placed within the mold cavity, thereby solidifying or shaping it into the desired product. Throughout the process, the precise closing of the upper and lower molds is crucial to ensuring the product's dimensional accuracy, appearance quality, and performance consistency.

[0003] However, existing molding lifting equipment still faces some pressing problems in actual operation. Firstly, after each mold opening and ejection of the product, tiny flash, debris, or mold release agent contaminants easily remain on the inner wall of the mold cavity, venting channels, or locating pins. If these residues are not cleaned in time, they can cause the mold to fail to close completely during subsequent mold closing processes, or misalignment of the upper and lower molds. This not only directly damages the surface of the precision mold, resulting in high maintenance costs, but also causes defects such as flash and material shortages on the product due to incomplete mold closing, seriously affecting the finished product yield. Currently, cleaning work relies heavily on intermittent manual labor, which is inefficient, incompletely cleans, and affects production continuity. Although some equipment has attempted to install independent blowing systems, these often require additional air sources and control units, leading to complex equipment structures and increased costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a precise positioning structure for a molding lifting device, which solves the problem that cleaning work relies heavily on manual, intermittent work, resulting in low efficiency and disruption to production continuity.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a precise positioning structure for a molding lifting device, comprising a main frame and a lower mold. A sliding column and a hydraulic cylinder are fixedly connected to the inner top wall of the main frame. An upper mold is slidably connected to the outer wall of the sliding column. The output end of the hydraulic cylinder is fixedly connected to the upper end face of the upper mold. A slider is fixedly connected to the upper end face of the upper mold. An air chamber shell is fixedly connected to the inner top wall of the main frame. The outer wall of the slider is slidably connected to the inner wall of the air chamber shell. An air pipe is fixedly connected to the outer wall of the air chamber shell. The air pipe is connected to an air supply pipe. The air supply pipe is fixedly connected to the outer wall of the lower mold. A nozzle is fixedly connected to the outer wall of the air supply pipe. A positioning mechanism is provided on the lower end face of the upper mold.

[0006] The above solution, through an innovative design that integrates pneumatic blowing with mold movement, significantly improves the automation level and operational efficiency of the equipment. When the upper mold rises and falls under the drive of a hydraulic cylinder, it simultaneously drives the slider to slide within the air chamber. The rising process compresses the air within the air chamber, creating a directional airflow that automatically blows the surface of the lower mold through air pipes and nozzles. This reduces manual cleaning, lowers labor intensity, and minimizes downtime. The organic integration of the air circuit and mold movement eliminates the need for an additional power source, achieving energy saving and efficiency improvement.

[0007] Preferably, the positioning mechanism includes an electric slide rail, the upper end face of which is fixedly connected to the lower end face of the upper mold, and a rangefinder is installed on the electric slide rail.

[0008] Preferably, a waste bin is fixedly connected to the outer wall of the lower mold on the side away from the nozzle.

[0009] Preferably, the waste bin has two sets of rotating shafts rotatably connected through it. The outer walls of both sets of rotating shafts are fixedly connected to crushing blades. One end of one of the rotating shafts is fixedly connected to the output end of a motor. The outer wall of the motor is fixedly installed on the outer wall of the waste bin. The other ends of the two sets of rotating shafts away from the motor are fixedly connected to transmission gears. The two sets of transmission gears mesh and rotate with each other.

[0010] Preferably, a second hydraulic cylinder is fixedly connected inside the lower mold, and a lifting frame is fixedly connected to the upper end of the output end of the second hydraulic cylinder. The outer wall of the lifting frame is slidably connected to the inside of the lower mold, and a cutting blade is fixedly connected to the upper end face of the lifting frame.

[0011] Preferably, a top column is fixedly connected to the inner bottom wall of the lifting frame, and an ejector rod is slidably connected inside the lower mold, with the bottom end of the ejector rod able to fit against the top end of the top column.

[0012] Preferably, an air pipe II is fixedly connected to the outer wall of the air chamber shell, a piston cylinder is fixedly connected to the outer wall of the air pipe II, the outer wall of the piston cylinder is fixedly connected to the outer wall of the lower mold, a piston rod is slidably connected inside the piston cylinder, a sliding plate I is fixedly connected to the outer wall of the piston rod, and the sliding plate I is slidably connected to the upper end face of the lower mold.

[0013] Preferably, the inner wall of the piston cylinder is fixedly connected to one end of the tension spring, and the other end of the tension spring is fixedly connected to the end of the piston rod away from the slide plate.

[0014] Preferably, a fixed frame is fixedly connected to one side of the waste bin, and a bracket is fixedly connected to the fixed frame. The two sides of the bracket are rotatably connected to the two ends of the reciprocating screw. A second sliding plate is threadedly connected to the outer wall of the reciprocating screw. The second sliding plate is slidably connected to the outer wall of the bracket. A second pulley is fixedly connected to the outer wall of the reciprocating screw, and a first pulley is fixedly connected to the outer wall of the rotating shaft. The first pulley and the second pulley are connected by a belt.

[0015] Preferably, a valve housing is fixedly connected to the outer wall of the gas supply pipe, the gas supply pipe and the gas pipe are connected through the valve housing, a valve plate is slidably connected inside the valve housing, a slide rod is fixedly connected to the outer wall of the valve plate, the slide rod is slidably connected to a fixed plate on the outer wall of the gas supply pipe, one end of a spring is fixedly connected to the outer wall of the slide rod, and the other end of the spring is fixedly connected to the valve housing.

[0016] Working principle: First, the main hydraulic cylinder starts, driving the upper mold to move downwards along the slide column. At this time, the rangefinder installed on the upper mold performs multi-point real-time distance measurement under the drive of the electric slide rail, ensuring precise alignment and mold closing of the upper and lower molds. During the mold closing process, the slider fixed to the upper mold slides down synchronously in the air chamber shell, drawing in air to prepare for subsequent processes. After mold closing, the equipment performs compression molding.

[0017] After molding, the process enters the mold opening and product processing stage. Before mold opening, the hydraulic cylinder inside the mold is activated first, driving the lifting frame to rise. The trimming blade on it rises accordingly, cooperating with the cutting groove of the upper mold to trim the product. Subsequently, the main hydraulic cylinder drives the upper mold to rise and open the mold. At the same time, the hydraulic cylinder inside the mold continues to lift, causing the ejector pin on the lifting frame to contact and push the ejector rod upward, ejecting the molded product from the mold. After ejection, the hydraulic cylinder retracts, driving the lifting frame and trimming blade to reset, and the ejector rod falls back down by its own weight.

[0018] The upward movement of the upper mold compresses the air in the air chamber of the slide block. The resulting airflow is delivered to the nozzle through a pipeline, blowing away residual waste on the surface of the lower mold. Simultaneously, some of the airflow drives the piston rod in the piston cylinder to extend, causing the sliding plate to push waste away from the nozzle towards the blowing area. Meanwhile, the crushing mechanism inside the waste bin, driven by a motor, continuously operates, not only crushing the collected waste but also driving another sliding plate to reciprocate via belt drive, gathering waste from the other side. The blown-away waste ultimately collects in the waste bin for further crushing.

[0019] In another embodiment, the airflow duct is equipped with a valve housing structure. When the piston rod extends, it simultaneously pushes the valve plate open, ensuring that airflow is only ejected from the nozzle after the slide plate has completed its pushing action. After the piston rod returns to its original position, the spring automatically closes the valve plate. This allows waste collection and high-pressure purging to proceed sequentially, significantly improving overall cleaning efficiency and optimizing cleaning results.

[0020] This invention provides a precise positioning structure for a molding lifting device. It has the following beneficial effects: 1. This invention utilizes the upward movement of the upper mold to drive the slider to slide within the air chamber shell, thereby blowing compressed air out from the nozzle through the air pipe and the air delivery pipe to automatically clean the surface of the lower mold, effectively removing residual waste, reducing manual intervention, and improving production efficiency.

[0021] 2. This invention features a waste bin on one side of the nozzle, allowing the blown waste to fall directly into the bin. Simultaneously, a motor-driven pulverizing blade crushes the waste, facilitating subsequent recycling, reducing environmental pollution, and lowering waste disposal costs. 3. This invention uses a hydraulic cylinder inside the lower mold to drive the lifting frame and the cutting blade, which automatically completes the product cutting before the mold opens, ensuring the quality of the product edges; at the same time, the top column on the lifting frame pushes the ejector rod when it rises, realizing the automatic ejection and demolding of the product, thus improving the degree of automation.

[0022] 4. This invention connects the air pipe and the piston cylinder through the air chamber shell. When the upper mold rises, it pushes the piston rod and the slide plate to slide. The rotating shaft drives the pulley and the reciprocating screw to make the slide plate slide back and forth on the support, pushing the residue on the waste bin side into the air blowing path. In conjunction with the air blowing of the nozzle, it further optimizes the cleaning effect, ensures comprehensive cleaning coverage, and prevents waste from accumulating.

[0023] 5. The present invention can also control the timing of the connection between the air pipe and the air delivery pipe through the valve housing, valve plate and slide rod mechanism; the valve plate opens only after the slide plate pushes the slide rod, ensuring that the blowing starts after the cleaning material is pushed into the path, thereby improving cleaning efficiency and reducing airflow waste. Attached Figure Description

[0024] Figure 1 This is a perspective view of the present invention; Figure 2 This is a partial structural diagram of the air chamber shell of the present invention; Figure 3 This is a partial structural diagram of the upper mold of the present invention; Figure 4 This is a partial structural diagram of the piston rod of the present invention; Figure 5 This is a partial structural diagram of the valve plate of the present invention; Figure 6 This is a partial structural diagram of the skateboard of the present invention; Figure 7 This is a partial structural diagram of the cutting blade of the present invention; Figure 8 This is a partial structural diagram of the lifting frame of the present invention; Figure 9 This is a partial structural diagram of the cutting blade of the present invention.

[0025] The components are as follows: 1. Main frame; 2. Sliding column; 3. Upper mold; 4. Hydraulic cylinder one; 5. Lower mold; 6. Air chamber shell; 7. Sliding block; 8. Air pipe one; 9. Air supply pipe; 10. Nozzle; 11. Electric slide rail; 12. Rangefinder; 13. Waste bin; 14. Motor; 15. Rotating shaft; 16. Crushing blade; 17. Transmission gear; 18. Hydraulic cylinder two; 19. Lifting frame; 20. Edge trimmer; 21. Top column; 22. Ejector rod; 23. Air pipe two; 24. Piston cylinder; 25. Piston rod; 26. Slide plate one; 27. Tension spring; 28. Fixing frame; 29. ​​Reciprocating screw; 30. Support; 31. Slide plate two; 32. Belt pulley one; 33. Belt pulley two; 34. Valve shell; 35. Valve plate; 36. Sliding rod; 37. Spring. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described 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.

[0027] Please see the appendix Figure 1 -Appendix Figure 9 This invention provides a precise positioning structure for a molding lifting device, including a main frame 1 and a lower mold 5. A sliding column 2 and a hydraulic cylinder 4 are fixedly connected to the inner top wall of the main frame 1. An upper mold 3 is slidably connected to the outer wall of the sliding column 2. The output end of the hydraulic cylinder 4 is fixedly connected to the upper end face of the upper mold 3. A slider 7 is fixedly connected to the upper end face of the upper mold 3. An air chamber shell 6 is fixedly connected to the inner top wall of the main frame 1. The outer wall of the slider 7 is slidably connected to the inner wall of the air chamber shell 6. An air pipe 8 is fixedly connected to the outer wall of the air chamber shell 6. The air pipe 8 is connected to an air supply pipe 9. The air supply pipe 9 is fixedly connected to the outer wall of the lower mold 5. A nozzle 10 is fixedly connected to the outer wall of the air supply pipe 9. A positioning mechanism is provided on the lower end face of the upper mold 3.

[0028] Specifically, this application uses an upper mold 3 and a lower mold 5 for molding. The main frame 1 provides support and fixation. The hydraulic cylinder 4 supports and guides the upper mold 3 to slide. To prevent the upper mold 3 from detaching from the hydraulic cylinder 4, a stop block can be added to the bottom of the hydraulic cylinder 4. This application uses the hydraulic cylinder 4 to drive the upper mold 3 to slide. The hydraulic cylinder 4 is connected to an external hydraulic pump or other device. This application adds a slider 7 to the upper end face of the upper mold 3. When the upper mold 3 is pressed down, it drives the slider 7 to slide inside the air chamber shell 6. At this time, the air chamber shell 6 introduces air through the air inlet. The air chamber shell 6 is equipped with a one-way valve that allows air to enter but not exit. When the upper mold 3 rises, the upper mold 3 drives the slider 7 to rise and pushes the gas inside the air chamber shell 6 to the air pipe 8. The air pipe 8 is also equipped with a one-way valve. The gas enters the air supply pipe 9 through the air pipe 8 and is then blown out through the air supply pipe 9, thus cleaning the upper mold 3 when it rises and the mold is opened.

[0029] The positioning mechanism includes an electric slide rail 11, the upper end face of which is fixedly connected to the lower end face of the upper mold 3, and a rangefinder 12 is installed on the electric slide rail 11.

[0030] Specifically, this application uses a rangefinder 12 for positioning. Two sets of rangefinders 12 are set on the upper end face of the upper mold 3. The rangefinders 12 measure the distance between the upper mold 3 and the lower mold 5 to achieve the positioning effect. In order to further ensure the smooth closing of the upper mold 3 and the lower mold 5, the rangefinders 12 can be driven by the electric slide rail 11 to measure the distance at different points.

[0031] A waste bin 13 is fixedly connected to the outer wall of the lower mold 5 on the side away from the nozzle 10.

[0032] Specifically, in order to prevent impurities from scattering and to facilitate the recycling of waste, a waste bin 13 is provided on the side facing the nozzle 10, and the blown material can directly enter the interior of the waste bin 13.

[0033] Two sets of rotating shafts 15 are rotatably connected through the inside of the waste bin 13. Crushing blades 16 are fixedly connected to the outer walls of both sets of rotating shafts 15. One end of one of the rotating shafts 15 is fixedly connected to the output end of a motor 14. The outer wall of the motor 14 is fixedly installed on the outer wall of the waste bin 13. The other ends of the two sets of rotating shafts 15 away from the motor 14 are fixedly connected to transmission gears 17. The two sets of transmission gears 17 mesh and rotate with each other.

[0034] Specifically, two sets of crushing blades 16 are installed inside the waste bin 13. The output shaft 15 is driven by the starter motor 14. The shaft 15 passes through the inside of the waste bin 13 and the waste bin 13 supports the rotation of the shaft 15. The shaft 15 rotates through the meshing of the transmission gear 17, which drives the other shaft 15 to rotate in reverse. The shaft 15 drives the crushing blades 16 to rotate, which can further crush the waste and facilitate recycling.

[0035] A hydraulic cylinder 18 is fixedly connected inside the lower mold 5. A lifting frame 19 is fixedly connected to the upper end of the output end of the hydraulic cylinder 18. The outer wall of the lifting frame 19 is slidably connected inside the lower mold 5. A cutting blade 20 is fixedly connected to the upper end face of the lifting frame 19.

[0036] Specifically, this application provides a hydraulic cylinder 18 inside the lower mold 5. The hydraulic cylinder 18 can drive the lifting frame 19 to rise and fall, and the lifting frame 19 can drive the cutting blade 20 to rise and fall. Before the mold is opened, the hydraulic cylinder 18 can drive the lifting frame 19 to rise, and the lifting frame 19 can drive the cutting blade 20 to rise to perform edge trimming on the product. To ensure the edge trimming effect, a groove can be added to the lower end face of the upper mold 3 to cooperate with the cutting blade 20.

[0037] The inner bottom wall of the lifting frame 19 is fixedly connected to the top column 21, and the lower mold 5 is slidably connected to the ejector rod 22. The bottom end of the ejector rod 22 can fit against the top end of the top column 21.

[0038] Specifically, a top column 21 is added to the lifting frame 19. After the mold is opened, the lifting frame 19 can be raised by the hydraulic cylinder 18. When it rises to a certain height, the lifting frame 19 pushes the ejector rod 22 to rise, thereby ejecting the product from the mold. When the hydraulic cylinder 18 lowers the lifting frame 19, the ejector rod 22 returns to its original position under its own weight. It should be noted that the ejector rod 22 is already at its lowest position in the reference figure. Due to the variable cross-section design of the ejector rod 22, the ejector rod 22 cannot be lowered and retracted into the lower mold 5.

[0039] An air pipe 23 is fixedly connected to the outer wall of the air chamber shell 6. A piston cylinder 24 is fixedly connected to the outer wall of the air pipe 23. The outer wall of the piston cylinder 24 is fixedly connected to the outer wall of the lower mold 5. A piston rod 25 is slidably connected inside the piston cylinder 24. A sliding plate 26 is fixedly connected to the outer wall of the piston rod 25. The sliding plate 26 is slidably connected to the upper end face of the lower mold 5.

[0040] Specifically, an air pipe 23 is added to the outside of the air chamber shell 6. When the slider 7 rises, the gas can enter the interior of the piston cylinder 24 through the air pipe 23, thereby pushing the piston rod 25 to slide. The piston rod 25 drives the slide plate 26 to slide. The slide plate 26 can push the object on the side of the upper mold groove of the lower mold 5 onto the path of the gas blown out by the nozzle 10, thereby ensuring that the object on the upper surface of the lower mold 5 can be blown into the interior of the waste box 13 through the nozzle 10.

[0041] The inner wall of the piston cylinder 24 is fixedly connected to one end of the tension spring 27, and the other end of the tension spring 27 is fixedly connected to the end of the piston rod 25 away from the slide plate 26.

[0042] Specifically, a tension spring 27 is added inside the piston cylinder 24. When the slider 7 rises, it causes the piston rod 25 to slide out of the piston cylinder 24. At this time, the tension spring 27 is stretched. When the slider 7 falls, the tension spring 27 rebounds and causes the piston rod 25 to return to its original position.

[0043] A fixed frame 28 is fixedly connected to one side of the waste bin 13. A bracket 30 is fixedly connected to the fixed frame 28. The two sides of the bracket 30 are rotatably connected to the two ends of the reciprocating screw 29. A sliding plate 31 is threadedly connected to the outer wall of the reciprocating screw 29. The sliding plate 31 is slidably connected to the outer wall of the bracket 30. A pulley 33 is fixedly connected to the outer wall of the reciprocating screw 29. A pulley 32 is fixedly connected to the outer wall of the rotating shaft 15. A belt connects the pulley 32 and the pulley 33.

[0044] Specifically, on the side furthest from the nozzle 10 and closer to the pulverizer 16, the shaft 15 drives pulley 32 to rotate. Pulley 32 drives pulley 33 to rotate via a belt. Pulley 33 drives reciprocating screw 29 to rotate. Reciprocating screw 29 is threadedly connected to slide plate 31. Reciprocating screw 29 pushes slide plate 31 to slide. Slide plate 31 also pushes the object onto the path of the gas blown out by nozzle 10. Pulley 32 and pulley 33 are both located inside the fixed frame 28 to avoid jamming. Waste bin 13 fixes the fixed frame 28. Fixed frame 28 fixes bracket 30. Bracket 30 supports the rotation of reciprocating screw 29 and supports the sliding of slide plate 31.

[0045] Example 2 A valve housing 34 is fixedly connected to the outer wall of the gas supply pipe 9. The gas supply pipe 9 and the gas pipe 8 are connected through the valve housing 34. A valve plate 35 is slidably connected inside the valve housing 34. A slide rod 36 is fixedly connected to the outer wall of the valve plate 35. The slide rod 36 is slidably connected to a fixed plate on the outer wall of the gas supply pipe 9. One end of a spring 37 is fixedly connected to the outer wall of the slide rod 36. The other end of the spring 37 is fixedly connected to the valve housing 34.

[0046] Specifically, in this embodiment, a valve housing 34 is added between the air pipe 8 and the air supply pipe 9. When the slider 7 rises, it first pushes the piston rod 25 to slide through the air pipe 23. After the piston rod 25 slides close to the slide rod 36, it pushes the slide rod 36 to slide. The slide rod 36 slides through the valve housing 34 and drives the valve plate 35 to slide. The valve plate 35 opens, and the spring 37 is compressed. When the spring 37 returns to its original position, it drives the slide rod 36 to slide in the opposite direction, thereby driving the valve plate 35 to close the valve. When the slide plate 26 pushes the object to one side, the valve plate 35 is opened. At this time, the nozzle 10 sprays air normally to clean.

[0047] 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 precision positioning structure for a molding lifting device, comprising a main frame (1) and a lower mold (5), characterized in that, The inner top wall of the main frame (1) is fixedly connected to a sliding column (2) and a hydraulic cylinder (4). The outer wall of the sliding column (2) is slidably connected to an upper mold (3). The output end of the hydraulic cylinder (4) is fixedly connected to the upper end face of the upper mold (3). The upper end face of the upper mold (3) is fixedly connected to a slider (7). The inner top wall of the main frame (1) is fixedly connected to an air chamber shell (6). The outer wall of the slider (7) is slidably connected to the inner wall of the air chamber shell (6). The outer wall of the air chamber shell (6) is fixedly connected to an air pipe (8). The air pipe (8) is connected to an air supply pipe (9). The air supply pipe (9) is fixedly connected to the outer wall of the lower mold (5). The outer wall of the air supply pipe (9) is fixedly connected to a nozzle (10). The lower end face of the upper mold (3) is provided with a positioning mechanism.

2. The precise positioning structure for a molding lifting device according to claim 1, characterized in that, The positioning mechanism includes an electric slide rail (11), the upper end face of which is fixedly connected to the lower end face of the upper mold (3), and a rangefinder (12) is installed on the electric slide rail (11).

3. The precise positioning structure for a molding lifting device according to claim 2, characterized in that, The lower mold (5) has a waste bin (13) fixedly connected to the outer wall on the side away from the nozzle (10).

4. The precise positioning structure for a molding lifting device according to claim 3, characterized in that, The waste bin (13) is internally connected to two sets of rotating shafts (15). The outer walls of both sets of rotating shafts (15) are fixedly connected to crushing blades (16). One end of one of the rotating shafts (15) is fixedly connected to the output end of a motor (14). The outer wall of the motor (14) is fixedly installed on the outer wall of the waste bin (13). The other ends of the two sets of rotating shafts (15) away from the motor (14) are fixedly connected to transmission gears (17). The two sets of transmission gears (17) mesh and rotate.

5. The precise positioning structure for a molding lifting device according to claim 4, characterized in that, The lower mold (5) is fixedly connected to a hydraulic cylinder two (18), and the upper end of the output end of the hydraulic cylinder two (18) is fixedly connected to a lifting frame (19). The outer wall of the lifting frame (19) is slidably connected to the interior of the lower mold (5), and the upper end face of the lifting frame (19) is fixedly connected to a cutting blade (20).

6. The precise positioning structure for a molding lifting device according to claim 5, characterized in that, The inner bottom wall of the lifting frame (19) is fixedly connected to a top column (21), and the lower mold (5) is slidably connected to an ejector rod (22). The bottom end of the ejector rod (22) can fit against the top end of the top column (21).

7. The precise positioning structure for a molding lifting device according to claim 6, characterized in that, The outer wall of the air chamber shell (6) is fixedly connected to the second air pipe (23), the outer wall of the second air pipe (23) is fixedly connected to the piston cylinder (24), the outer wall of the piston cylinder (24) is fixedly connected to the outer wall of the lower mold (5), the piston cylinder (24) is slidably connected to the inside of the piston rod (25), the outer wall of the piston rod (25) is fixedly connected to the first sliding plate (26), and the first sliding plate (26) is slidably connected to the upper end face of the lower mold (5).

8. The precise positioning structure for a molding lifting device according to claim 7, characterized in that, The inner wall of the piston cylinder (24) is fixedly connected to one end of the tension spring (27), and the other end of the tension spring (27) is fixedly connected to the end of the piston rod (25) away from the slide plate (26).

9. The precise positioning structure for a molding lifting device according to claim 8, characterized in that, A fixed frame (28) is fixedly connected to one side of the waste bin (13), and a bracket (30) is fixedly connected to the fixed frame (28). The two sides of the bracket (30) are rotatably connected to the two ends of the reciprocating screw (29). A sliding plate (31) is threadedly connected to the outer wall of the reciprocating screw (29). The sliding plate (31) is slidably connected to the outer wall of the bracket (30). A pulley (33) is fixedly connected to the outer wall of the reciprocating screw (29). A pulley (32) is fixedly connected to the outer wall of the rotating shaft (15). A belt connects the pulley (32) and the pulley (33).

10. A precise positioning structure for a molding lifting device according to claim 9, characterized in that, A valve housing (34) is fixedly connected to the outer wall of the gas supply pipe (9). The gas supply pipe (9) and the gas pipe (8) are connected through the valve housing (34). A valve plate (35) is slidably connected inside the valve housing (34). A slide rod (36) is fixedly connected to the outer wall of the valve plate (35). The slide rod (36) is slidably connected to the fixed plate on the outer wall of the gas supply pipe (9). One end of a spring (37) is fixedly connected to the outer wall of the slide rod (36). The other end of the spring (37) is fixedly connected to the valve housing (34).

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