Plastic uptake well lid mold convenient to demold

Abstract

The invention discloses a plastic uptake well lid mold convenient to demold, and belongs to the technical field of plastic uptake molds, the plastic uptake well lid mold convenient to demold comprises a lower mold and an upper mold, guide rods are fixed to the two corners of the lower mold, guide caps are fixed to the two corners of the upper mold, a forming cavity is formed in the middle of the lower mold, and the guide rods are fixed to the guide rods. A plurality of suction holes are formed in the forming cavity, a vacuum pump connector is fixed to one side of the lower mold, and a mounting base is fixed to the upper end of the upper mold; vent holes are formed in the two sides of the forming cavity correspondingly, and sliding grooves are formed in the other ends of the two vent holes correspondingly. According to the plastic uptake well lid mold convenient to demold, the upper mold is driven by the air cylinder to ascend and descend, on one hand, the air-blowing auxiliary demolding effect is achieved, the using effect of the plastic uptake well lid mold is improved, on the other hand, the automatic deburring effect is achieved, the using convenience of the plastic uptake well lid mold is improved, and on the other hand, the rapid air-cooling heat dissipation effect of a product is achieved; and the use safety of the plastic uptake well lid mold is improved.

Description

Technical Field

[0001] This invention relates to the field of vacuum forming mold technology, specifically to a vacuum forming manhole cover mold that is easy to demold. Background Technology

[0002] Vacuum forming technology, as a high-efficiency and low-cost plastic molding process, has been widely used in many industrial and public sectors, such as plastic packaging, municipal facilities, and building decoration, thanks to its advantages such as fast forming speed, high material utilization, and good product consistency. Vacuum-formed manhole covers, in particular, with their outstanding advantages of light weight, corrosion resistance, good insulation, low production cost, and convenient installation and maintenance, effectively overcome the shortcomings of traditional cast iron manhole covers, such as easy rusting, heavy weight, high cost, and easy loss. They are gradually replacing traditional metal manhole covers and have become a widely used supporting infrastructure in municipal roads, residential areas, industrial parks, underground pipe networks, and other scenarios. In the large-scale production of vacuum-formed manhole covers, the mold, as the core process equipment, directly determines the forming accuracy, appearance quality, structural strength, and production efficiency of the manhole cover, and is a key component for achieving stable and efficient manufacturing of vacuum-formed manhole covers.

[0003] Although existing vacuum forming manhole cover molds can achieve the basic shaping and production of vacuum forming manhole covers, there are still many technical defects in actual large-scale production applications, specifically reflected in the following aspects:

[0004] Firstly, existing vacuum-formed manhole cover molds, after vacuum forming, result in a tight fit and strong adhesion between the manhole cover and the mold cavity, lacking an auxiliary demolding structure. During demolding, operators often need to manually pull and pry the product, which is not only labor-intensive and inefficient, but also easily causes deformation, cracking, and edge damage to the manhole cover. It also exacerbates wear on the mold cavity, significantly reducing the overall performance of the mold, thus resulting in suboptimal performance of the vacuum-formed manhole cover mold.

[0005] Secondly, during the molding process of vacuum-formed manhole covers, factors such as material flow, mold closing accuracy, and process parameters can easily cause burrs and other excess waste to accumulate on the edges of the product. Existing mold structures lack the function of simultaneous cutting and automatic burr removal, requiring manual grinding and trimming with tools. This process is not only cumbersome and time-consuming, but also makes it difficult to ensure the consistency and cleanliness of burr removal, failing to meet the requirements of automated and continuous production and resulting in insufficient ease of use of the mold.

[0006] Third, vacuum forming is a thermoforming process, meaning that the manhole cover and mold surfaces remain at high temperatures after forming. Existing molds rely solely on natural heat dissipation for cooling, resulting in extremely low efficiency. Consequently, the product temperature cannot quickly drop to a safe operating temperature when the mold is opened. Operators are highly susceptible to burns from the high-temperature product or mold surface when removing the parts, posing a significant safety risk. This highlights a clear shortcoming in the safety of the mold during use, leading to insufficient safety in the use of vacuum-formed manhole cover molds. Summary of the Invention

[0007] The purpose of this invention is to provide a vacuum-formed manhole cover mold that is easy to demold, so as to solve the problems mentioned in the background art.

[0008] To solve the above technical problems, the present invention provides the following technical solution: a vacuum forming manhole cover mold that is easy to demold, comprising a lower mold and an upper mold, wherein guide rods are fixed at both corners of the lower mold and guide caps are fixed at both corners of the upper mold, a forming cavity is provided in the middle of the lower mold, and a plurality of suction holes are provided in the forming cavity, a vacuum pump connector is fixed on one side of the lower mold, and a mounting base is fixed at the upper end of the upper mold;

[0009] Ventilation holes are provided on both sides of the molding cavity, and a sliding groove is provided at the other end of each of the two ventilation holes. A connecting structure is provided on the upper mold, and two fixing blocks are provided on the connecting structure. A rubber ring is provided in the middle of each fixing block. The connecting structure can move along the length of the two sliding grooves with the fixing blocks and rubber rings to generate a pressure difference with the sliding grooves and act on the product through the ventilation holes to assist in demolding.

[0010] Furthermore, the connection structure includes a fixed base, a connecting frame detachably and rotatably connected to the fixed base, a connecting base detachably and rotatably connected to the other end of the connecting frame, a sliding frame fixed to one end of the connecting base, a fixing block fixed to both ends of the sliding frame, and a rubber ring sleeved in the middle of each of the two fixing blocks.

[0011] Furthermore, one end of the fixed seat is fixed to the rear side of the upper mold, the other end of the fixed seat is detachably and rotatably connected to the upper end of the connecting frame, the lower end of the connecting frame is rotatably connected to the upper end of the connecting seat, the lower end of the connecting seat is fixed to one side of the sliding frame, and the cross-section of the sliding frame is U-shaped.

[0012] Furthermore, the two ends of the sliding frame are fixed to the middle of the two fixed blocks, the two rubber rings are tightly fitted into the middle of the two fixed blocks, the outer surfaces of the two rubber rings are slidably connected to the inner walls of the two sliding grooves, and the two sliding grooves are connected to the two vent holes.

[0013] Furthermore, a rotating rod is rotatably connected to one side of the sliding frame, a gear is fixed in the middle of the rotating rod, a first rack is meshed with one side of the gear, a second rack is meshed with the other side of the gear, a drive frame is fixed to one side of the second rack, a cutting blade is fixed to one side of the drive frame, and a limit groove is formed on the upper side of the lower mold.

[0014] Furthermore, the outer surface of the rotating rod is rotatably connected to the inner wall of one side of the sliding frame, the middle part of the rotating rod is fixed to the middle part of the gear, the gear is meshed with the first rack, and one end of the first rack is fixed to one side of the lower mold.

[0015] Furthermore, the gear meshes with the second rack, one side of the second rack is fixed to one side of the drive frame, the outer surface of the drive frame is slidably connected to the inner wall of the limiting groove, the vertical cross-section of the drive frame is L-shaped, one side of the drive frame is fixed to one side of the cutting blade, the cutting blade is in contact with the inner wall of the limiting groove, and the vertical cross-section of the cutting blade is a right-angled triangle.

[0016] Furthermore, a fan impeller is fixed to one end of the rotating rod, a connecting ring is fixed to the outside of the fan impeller, a stabilizing seat is rotatably connected to the outer surface of the connecting ring, a stabilizing block is fixed to one side of the stabilizing seat, a connecting hose is fixed to the middle of the stabilizing seat, a support frame is fixed to the other end of the connecting hose, and a stabilizing groove is opened on one side of the lower mold.

[0017] Furthermore, one end of the rotating rod is fixed to the middle of the fan impeller, the outer side of the fan impeller is fixed to the inner wall of the connecting ring, the vertical section of the connecting ring is circular, and the outer surface of the connecting ring is rotatably connected to the inner wall of the stabilizing seat.

[0018] Furthermore, one side of the stabilizing seat is fixed to one end of the stabilizing block, the outer surface of the stabilizing block is slidably connected to the inner wall of the stabilizing groove, the stabilizing groove passes through one side of the lower mold, the middle part of the stabilizing seat is fixed to one end of the connecting hose, the other end of the connecting hose is fixed to one side of the support frame, the vertical section of the support frame is L-shaped, and one end of the support frame is fixed to one side of the lower mold.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) The present invention drives the upper mold to move up and down by a cylinder, so that the ventilation hole, slide, fixed seat, connecting frame, connecting seat, sliding frame, fixed block and rubber ring work together to achieve the effect of air blowing assisted demolding. Demolding can be completed without the need for workers to manually pull, effectively reducing labor intensity, avoiding product deformation and damage, thereby improving the use effect of vacuum forming well cover mold;

[0021] (2) The present invention drives the upper mold to move up and down by a cylinder, so that the rotating rod, gear, first rack, second rack, drive frame, cutting blade and limiting groove work together to achieve automatic deburring effect without manual repair, providing convenience for operators and effectively improving the ease of use of vacuum forming manhole cover mold;

[0022] (3) The present invention drives the upper mold to move up and down by a cylinder, so that the fan impeller, connecting ring, stabilizing seat, stabilizing block, connecting hose, support frame and stabilizing groove work together to achieve the effect of rapid air cooling of the product, so that the surface temperature of the product drops to the safe operating range at the moment of mold opening, eliminating the risk of burns when the operator takes out the part, and effectively improving the safety of the use of the blister well cover mold. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a front sectional view of the lower mold of the present invention;

[0025] Figure 3 This is a side sectional view of the lower mold of the present invention;

[0026] Figure 4 For the present invention Figure 3 Enlarged view of the A-section structure;

[0027] Figure 5 This is a partial structural cross-sectional view of the present invention;

[0028] Figure 6 For the present invention Figure 5 Enlarged view of the structure of section B;

[0029] Figure 7 This is a partial structural diagram of the present invention;

[0030] Figure 8 This is a schematic diagram of the lower mold structure of the present invention.

[0031] In the diagram: 1. Lower mold; 2. Upper mold; 3. Guide rod; 4. Guide cap; 5. Molding cavity; 6. Suction hole; 7. Vacuum pump connector; 8. Mounting base; 9. Vent hole; 10. Slide groove; 11. Fixed base; 12. Connecting frame; 13. Connecting base; 14. Sliding frame; 15. Fixed block; 16. Rubber ring; 17. Rotating rod; 18. Gear; 19. First rack; 20. Second rack; 21. Drive frame; 22. Cutting blade; 23. Limiting groove; 24. Fan impeller; 25. Connecting ring; 26. Stabilizing base; 27. Stabilizing block; 28. Connecting hose; 29. ​​Support frame; 30. Stabilizing groove. Detailed Implementation

[0032] 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.

[0033] Example 1

[0034] This embodiment provides a vacuum forming manhole cover mold that is easy to demold.

[0035] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 The system includes a lower mold 1 and an upper mold 2. Guide rods 3 are fixed to both corners of the lower mold 1, and guide caps 4 are fixed to both corners of the upper mold 2. A forming cavity 5 is formed in the middle of the lower mold 1, and several suction holes 6 are formed inside the forming cavity 5. A vacuum pump connector 7 is fixed to one side of the lower mold 1, and a mounting base 8 is fixed to the upper end of the upper mold 2. Ventilation holes 9 are formed on both sides of the forming cavity 5, and a sliding groove 10 is formed at the other end of each of the two ventilation holes 9. A connecting structure is provided on the upper mold 2, including a fixed base 11. A connecting frame 12 is detachably and rotatably connected to the fixed base 11, and a connecting base 13 is detachably and rotatably connected to the other end of the connecting frame 12. A sliding frame 14 is fixed to one end of the connecting base 13, and fixed blocks 15 are fixed to both ends of the sliding frame 14. Rubber rings 16 are fitted around the middle of each of the two fixed blocks 15. The rubber rings 16 fitted around the fixed blocks 15 can... This effectively ensures the sealing performance of the slide 10, preventing gas leakage inside and outside the slide 10. This ensures that a stable positive and negative pressure difference is formed inside the slide 10 during the displacement of the fixing block 15 and the rubber ring 16. As the upper mold 2 rises and falls, the fixing block 15 drives the rubber ring 16 to slide directionally along the inner wall of the slide 10, causing the internal volume of the slide 10 to change regularly. The pressure difference airflow can smoothly enter and exit the molding cavity 5 through the vent hole 9. This not only allows for stable adsorption and positioning of the blank during the molding stage, ensuring the quality of the molded product, but also generates an airflow thrust during the mold opening stage, quickly breaking the adsorption state between the product and the cavity, achieving smooth demolding without manual assistance. It also improves the stability and reliability of the mold's pneumatic transmission.

[0036] Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4It is worth noting that one end of the fixed seat 11 is fixed to the rear side of the upper mold 2, and the other end of the fixed seat 11 is detachably and rotatably connected to the upper end of the connecting frame 12. The lower end of the connecting frame 12 is rotatably connected to the upper end of the connecting seat 13. The lower end of the connecting seat 13 is fixed to one side of the sliding frame 14. The cross-section of the sliding frame 14 is U-shaped. Both ends of the sliding frame 14 are fixed to the middle of the two fixed blocks 15. The two rubber rings 16 are tightly fitted to the middle of the two fixed blocks 15. The outer surfaces of the two rubber rings 16 are slidably connected to the inner walls of the two slide grooves 10. The two slide grooves 10 are connected to the two vent holes 9.

[0037] In use, the invention is as follows: First, the lower mold 1 is installed on the processing platform. The mounting base 8, fixed at the middle of the upper end of the upper mold 2, is installed on the cylinder drive end. Then, the connecting frame 12 is installed on the fixed base 11 and the connecting base 13 respectively, completing the initial assembly of the mold. The upper mold 2 is driven to move up and down by the cylinder, and the fixed base 11, fixed to one side of the upper mold 2, moves up and down synchronously. The moving fixed base 11, through the detachably rotatably connected connecting frame 12, drives the connecting base 13 to generate a linkage force, so that the sliding frame 14, fixed to the lower end of the connecting base 13, slides under the limiting action of the sliding groove 10 opened in the lower mold 1. The sliding frame 14 drives the fixed blocks 15 fixed at both ends, and the rubber ring 16 sleeved between the two fixed blocks 15 achieves sealed sliding within the sliding groove 10.

[0038] When the upper mold 2 closes downwards, the sliding frame 14 moves away from the lower mold 1, increasing the internal volume of the slide groove 10. The air inside the cavity is stretched, creating a negative pressure. The negative pressure airflow passes through the vent 9 on one side of the slide groove 10 and into the forming cavity 5, pre-adsorbing and positioning the blank material covering the forming cavity 5. Subsequently, the blank material is fully adsorbed and shaped through several suction holes 6 via a vacuum pump connected to the vacuum pump connector 7. After the vacuum forming is completed, the upper mold 2 opens upwards, and the sliding frame 14 moves closer to the lower mold 1. The internal volume of the slide groove 10 is compressed, and the gas inside the cavity is pressurized and introduced into the forming cavity 5 through the vent 9. The airflow entering the forming cavity 5 creates an air blowing effect on the vacuum-formed product, breaking the adsorption and adhesion between the product and the cavity surface, achieving the effect of air blowing assisted demolding. Demolding can be completed without manual pulling by the staff, effectively reducing labor intensity, avoiding product deformation and damage, and thus improving the performance of the vacuum-formed manhole cover mold.

[0039] Example 2

[0040] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 An automatic deburring function has been added based on Embodiment 1;

[0041] Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4 It is worth noting that a rotating rod 17 is rotatably connected to one side of the sliding frame 14. A gear 18 is fixed in the middle of the rotating rod 17. A first rack 19 is meshed with one side of the gear 18, and a second rack 20 is meshed with the other side of the gear 18. A drive frame 21 is fixed to one side of the second rack 20, and a cutting blade 22 is fixed to one side of the drive frame 21. A limit groove 23 is formed on the upper side of the lower mold 1. The outer surface of the rotating rod 17 is rotatably connected to the inner wall of one side of the sliding frame 14. The middle of the rotating rod 17 is fixed to the middle of the gear 18. The gear 18 meshes with the first rack 19. One end of the first rack 19 is fixed to one side of the lower mold 1. The gear 18 meshes with the second rack 20. One side of the second rack 20 is fixed to one side of the drive frame 21. The outer surface of the drive frame 21 is slidably connected to the inner wall of the limit groove 23. The vertical section of the drive frame 21 is L-shaped. One side of the moving frame 21 is fixed to one side of the cutting blade 22. The cutting blade 22 is in contact with the inner wall of the limiting groove 23. The vertical cut surface of the cutting blade 22 is set as a right-angled triangle. The first rack 19 is fixed. During the synchronous translation of the sliding frame 14, the gear 18 continuously meshes with the first rack 19 and rotates, thereby driving the meshing second rack 20 to perform synchronous doubling motion. Relying on the meshing transmission structure of the gear 18, the first rack 19 and the second rack 20, the linear displacement of the sliding frame 14 can be converted into the amplified displacement of the second rack 20. This can ensure that the transmission action is accurate and synchronous without lag deviation, and can also realize the directional amplification of the displacement stroke to meet the stroke requirements of subsequent burr cutting operations. This makes the overall transmission structure more compact and can realize linkage transmission without the need for an additional power source, thereby improving the operating efficiency and linkage stability of the internal structure of the mold.

[0042] In use, this invention works as follows: The upper mold 2 is driven to move up and down by a cylinder. The movable fixed seat 11, via a detachably rotatably connected connecting frame 12, drives a connecting seat 13, also detachably rotatably connected at its other end, to move in tandem. This causes the sliding frame 14, fixed to the lower end of the connecting seat 13, to slide under the limiting action of the sliding groove 10 opened in the lower mold 1. The sliding frame 14 drives a rotating rod 17, rotatably connected to one side, to move synchronously. The rotating rod 17 drives a gear 18, fixed in its middle, to move synchronously. The gear 18 rotates in cooperation with a first rack 19 meshing with it on its lower side. One end of the first rack 19 is fixed to one side of the lower mold 1. Simultaneously, the gear 18 rotates, driving a second rack 20 meshing with it on its upper side to achieve a doubling motion. The second rack 20 drives the upper fixed drive frame 21 to slide under the limiting action of the limiting groove 23 opened in the lower mold 1. The sliding drive frame 21 drives a cutting blade 22, fixed to one side, to move synchronously.

[0043] When the upper mold 2 moves down to close, the cutting blade 22 moves towards the sliding frame 14, without interfering with the laying and adsorption forming of the blank. When the vacuum forming is completed and the upper mold 2 moves up to open, the cutting blade 22 moves away from the sliding frame 14 to remove burrs from the edges of the formed product that have been lifted by the gas and are in contact with the cutting blade 22. The cutting edge of the cutting blade 22 is adapted to remove burrs only and will not damage the product body, thus achieving an automatic deburring effect without the need for manual trimming, providing convenience for operators and effectively improving the ease of use of the vacuum forming manhole cover mold.

[0044] Example 3

[0045] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 Based on Embodiment 2, a rapid air-cooling function has been added;

[0046] Please refer to it again. Figure 1 , Figure 2 , Figure 3 and Figure 4 It is worth noting that one end of the rotating rod 17 is fixed to a fan impeller 24, and a connecting ring 25 is fixed to the outside of the fan impeller 24. A stabilizing seat 26 is rotatably connected to the outer surface of the connecting ring 25. A stabilizing block 27 is fixed to one side of the stabilizing seat 26, and a connecting hose 28 is fixed to the middle of the stabilizing seat 26. A support frame 29 is fixed to the other end of the connecting hose 28. A stabilizing groove 30 is provided on one side of the lower mold 1. One end of the rotating rod 17 is fixed to the middle of the fan impeller 24, and the outside of the fan impeller 24 is fixed inside the connecting ring 25. The connecting ring 25 has a circular vertical section. The outer surface of the connecting ring 25 is rotatably connected to the inner wall of the stabilizing seat 26. One side of the stabilizing seat 26 is fixed to one end of the stabilizing block 27. The outer surface of the stabilizing block 27 is slidably connected to the inner wall of the stabilizing groove 30. The stabilizing groove 30 passes through one side of the lower mold 1. The middle part of the stabilizing seat 26 is fixed to one end of the connecting hose 28. The other end of the connecting hose 28 is fixed to one side of the support frame 29. The support frame 29 has an L-shaped vertical section. One end of the support frame 29 is fixed to one side of the lower mold 1.

[0047] In use, the invention works as follows: the upper mold 2 is driven to move up and down by a cylinder. The fixed seat 11, which moves synchronously with the upper mold 2, drives the connecting seat 13, which is detachably and rotatably connected to the other end of the connecting frame 12, to operate in conjunction with the upper mold 2. This causes the sliding frame 14, which is fixed to the lower end of the connecting seat 13, to slide smoothly under the limiting guidance of the sliding groove 10 opened in the lower mold 1. The sliding frame 14 drives the rotating rod 17, which is rotatably connected to one side, to move synchronously. The gear 18, which is fixedly installed in the middle of the rotating rod 17, moves synchronously with it. During the movement, the gear 18 meshes with the first rack 19, which is fixedly installed on one side of the lower mold 1, thereby achieving high-speed rotation. While the gear 18 is rotating at high speed, it simultaneously drives the rotating rod 17, which is fixedly installed through the middle, to rotate at high speed.

[0048] The high-speed rotating rod 17 drives the fan impeller 24, which is fixed at the end, to rotate synchronously at high speed. The connecting ring 25, which is fixed on the outside of the fan impeller 24, rotates synchronously as well. Under the limiting and guiding of the inner wall of the stabilizing seat 26 and the stabilizing block 27, the connecting ring 25 rotates smoothly and at high speed within the stabilizing groove 30 opened on one side of the lower mold 1, ensuring the operational stability of the fan impeller 24. The high-speed rotating fan impeller 24 drives the air to flow rapidly. The airflow is guided by the connecting hose 28 fixed on one side of the stabilizing seat 26 and completes the intake or exhaust action through the opening of the support frame 29. When the upper mold 2 moves down to close, the fan impeller 24 rotates to generate negative pressure airflow, which draws in air from the opening of the support frame 29. This can pre-absorb and clean the dust and impurities attached to the surface of the blank to be processed, ensuring the quality of the product molding. When the product is vacuum-formed and the upper mold 2 moves up to open, the fan impeller 24 rotates to generate positive airflow, which is sprayed out from the opening of the support frame 29 and blows directly onto the molded product, achieving the effect of rapid air cooling and heat dissipation. This allows the surface temperature of the product to drop rapidly to a safe operating range at the moment the mold opens, eliminating the risk of burns to operators when removing the parts and effectively improving the safety of vacuum-formed manhole cover molds.

[0049] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A thermoforming manhole cover mold for easy demolding, comprising a lower mold and an upper mold, characterized in that, Guide rods are fixed at both corners of the lower mold, guide caps are fixed at both corners of the upper mold, a forming cavity is opened in the middle of the lower mold, a number of suction holes are opened in the forming cavity, a vacuum pump connector is fixed on one side of the lower mold, and a mounting base is fixed at the upper end of the upper mold. Ventilation holes are provided on both sides of the molding cavity, and a sliding groove is provided at the other end of each of the two ventilation holes. A connecting structure is provided on the upper mold, and two fixing blocks are provided on the connecting structure. A rubber ring is provided in the middle of each fixing block. The connecting structure can move along the length of the two sliding grooves with the fixing blocks and rubber rings to generate a pressure difference with the sliding grooves and act on the product through the ventilation holes to assist in demolding.

2. The easily demolded vacuum-formed manhole cover mold according to claim 1, characterized in that, The connection structure includes a fixed base, a connecting frame detachably and rotatably connected to the fixed base, a connecting base detachably and rotatably connected to the other end of the connecting frame, a sliding frame fixed to one end of the connecting base, a fixing block fixed to both ends of the sliding frame, and a rubber ring sleeved in the middle of each of the two fixing blocks.

3. The easily demolded vacuum-formed manhole cover mold according to claim 2, characterized in that, One end of the fixed base is fixed to the rear side of the upper mold, and the other end of the fixed base is detachably and rotatably connected to the upper end of the connecting frame. The lower end of the connecting frame is rotatably connected to the upper end of the connecting base, and the lower end of the connecting base is fixed to one side of the sliding frame. The cross-section of the sliding frame is U-shaped.

4. The easily demolded vacuum-formed manhole cover mold according to claim 2, characterized in that, The sliding frame is fixed at both ends to the middle of two fixed blocks, and the two rubber rings are tightly fitted to the middle of the two fixed blocks. The outer surfaces of the two rubber rings are slidably connected to the inner walls of the two sliding grooves, and the two sliding grooves are connected to two vent holes.

5. A thermoforming manhole cover mold for easy demolding according to claim 2, characterized in that, A rotating rod is rotatably connected to one side of the sliding frame. A gear is fixed in the middle of the rotating rod. A first rack is meshed with one side of the gear, and a second rack is meshed with the other side of the gear. A drive frame is fixed to one side of the second rack, and a cutting blade is fixed to one side of the drive frame. A limit groove is formed on the upper side of the lower mold.

6. The easily demolded vacuum-formed manhole cover mold according to claim 5, characterized in that, The outer surface of the rotating rod is rotatably connected to the inner wall of one side of the sliding frame. The middle part of the rotating rod is fixed to the middle part of the gear. The gear meshes with the first rack. One end of the first rack is fixed to one side of the lower mold.

7. A thermoforming manhole cover mold for easy demolding according to claim 5, characterized in that, The gear meshes with the second rack, one side of the second rack is fixed to one side of the drive frame, the outer surface of the drive frame is slidably connected to the inner wall of the limiting groove, the vertical cross-section of the drive frame is L-shaped, one side of the drive frame is fixed to one side of the cutting blade, the cutting blade is in contact with the inner wall of the limiting groove, and the vertical cross-section of the cutting blade is a right triangle.

8. A thermoforming manhole cover mold for easy demolding according to claim 5, characterized in that, One end of the rotating rod is fixed with a fan impeller, a connecting ring is fixed to the outside of the fan impeller, a stabilizing seat is rotatably connected to the outer surface of the connecting ring, a stabilizing block is fixed to one side of the stabilizing seat, a connecting hose is fixed to the middle of the stabilizing seat, a support frame is fixed to the other end of the connecting hose, and a stabilizing groove is opened on one side of the lower mold.

9. A thermoforming manhole cover mold for easy demolding according to claim 8, characterized in that, One end of the rotating rod is fixed to the middle of the fan impeller, the outer side of the fan impeller is fixed to the inner wall of the connecting ring, the vertical section of the connecting ring is circular, and the outer surface of the connecting ring is rotatably connected to the inner wall of the stabilizing seat.

10. A thermoforming manhole cover mold for easy demolding according to claim 8, characterized in that, One side of the stabilizing seat is fixed to one end of the stabilizing block. The outer surface of the stabilizing block is slidably connected to the inner wall of the stabilizing groove. The stabilizing groove passes through one side of the lower mold. The middle part of the stabilizing seat is fixed to one end of the connecting hose. The other end of the connecting hose is fixed to one side of the support frame. The vertical section of the support frame is L-shaped. One end of the support frame is fixed to one side of the lower mold.

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