A pulp molding container cover and hot pressing mold thereof

Abstract

The present invention relates to the technical field of hot pressing molding, and discloses a pulp molding container cover and a hot pressing mold thereof, including a pulp molding container cover, the pulp molding container cover comprising: a cover body, the bottom of the cover body is provided with an annular groove, the bottom of the cover body is provided with an arc-shaped connecting port, and the cover body is also provided with a handle; a hot pressing mold of the pulp molding container cover, which is applied to the above-mentioned pulp molding container cover. The pulp molding container cover and its hot pressing mold are set by a switching mechanism, and the telescopic motor is turned on to drive the upper mold and the lower mold to close the mold. Through the negative pressure transmission path, the problems of bubbles and deformation of the pulp wet film during the molding process are reduced. The formation of negative pressure can effectively exclude the air inside the mold, improve the vacuum state inside the mold, and improve the molding accuracy and quality of the pulp molding container cover. The negative pressure effect can help to uniformly press the pulp during the hot pressing process, avoid local overheating or overpressure, and ensure the uniformity of the final product.

Description

Technical Field

[0001] The invention relates to the technical field of hot pressing molding, in particular to a pulp molding container cover and a hot pressing mold thereof. Background Art

[0002] Pulp molding is a technology that uses pulp as raw material to manufacture containers and packaging materials through processes such as molding and hot pressing. Pulp molded container covers are usually used in industries such as food packaging and disposable tableware. The hot pressing mold is a key equipment in the pulp molding process. It presses the wet pulp film into shape by heating and applying pressure. For the hot pressing mold design of container covers.

[0003] Chinese patent CN221072083U discloses "a pulp molding hot pressing mold pore structure". The pulp molding hot pressing mold pore structure has the effect of uniform exhaust through the coordinated arrangement of exhaust grooves, central exhaust holes, peripheral exhaust holes and air bag holes. An air network with a large coverage area is formed at the bottom of the mold forming surface by providing exhaust grooves that are staggered and interconnected above the evenly distributed central exhaust holes. At the same time, separate peripheral exhaust holes are also arranged at the edge of the product. Since the air network almost covers the entire bottom surface of the product and the edge is also provided with exhaust holes and exhaust is carried out simultaneously, the exhaust is uniform. Since the air bag holes have the function of storing air, a large amount of steam generated when just heated can be temporarily stored in the air bag holes and then slowly discharged to achieve uniform exhaust.

[0004] However, the design of the exhaust groove and the exhaust hole is small. Although it can reduce the deformation or displacement of the product caused by negative pressure during the molding process by reducing the vacuum suction force, it is limited by the flow resistance and particle deposition mechanism in fluid dynamics. The small pore size and narrow channel are prone to fiber or impurity blockage in the pulp molding process. According to the principles of fluid mechanics, when the gas passes through a narrow channel, the flow rate is inversely proportional to the cross-sectional area, and the flow resistance increases exponentially as the channel diameter decreases, which will cause the fibers carried in the pulp wet film to deposit at the entrance of the exhaust hole due to the decrease in flow rate; at the same time, the geometric properties of the fiber (such as length, curl) and surface roughness make it more prone to mechanical entanglement or electrostatic adsorption at the microscopic scale, further exacerbating the risk of blockage. In addition, according to the theory of capillary phenomenon, the hydrophilicity of the surface of the pulp fiber will cause the water to form a liquid film in the tiny pores. After the liquid film evaporates, the residual fiber skeleton and impurities will form a solid bridging structure in the pores, resulting in physical blockage. From the perspective of material processing, the average diameter of pulp fibers is usually in the range of 10-50 microns. When the width of the exhaust groove or the diameter of the exhaust hole is close to or less than the critical value of the fiber length (generally 2-3 times the fiber length), the fiber cannot be discharged through free diffusion or shear flow, but will form a three-dimensional network retention body in the channel. This phenomenon conforms to the blockage threshold model of suspended particles in non-Newtonian fluids. Although the high temperature environment during the hot pressing process can accelerate the evaporation of water, it will also cause the components such as lignin in the fiber to undergo thermal softening, resulting in enhanced adhesion between fibers and the formation of a more stable blockage body in the exhaust channel. This series of physical and chemical effects together lead to the inevitability of irreversible blockage of the exhaust structure in practical applications. Summary of the invention

[0005] Technical issues solved In view of the shortcomings of the prior art, the present invention provides a pulp molding container cover and a hot pressing mold thereof, which solves the problem that the exhaust grooves and exhaust holes are easily blocked due to factors such as reduced flow rate, fiber deposition, electrostatic adsorption and capillary phenomena during the pulp molding process.

[0006] (II) Technical solution To achieve the above object, the present invention provides the following technical solutions: A pulp molded container cover comprises a pulp molded container cover, wherein the pulp molded container cover comprises a cover body, a ring-shaped groove is arranged at the bottom of the cover body, an arc-shaped connecting port is opened at the bottom of the cover body, and a handle is also arranged on the cover body.

[0007] A hot pressing mold for a pulp molded container cover, applied to the above-mentioned pulp molded container cover, also includes: an upper mold, a lower mold, the upper mold and the lower mold are used in combination; a telescopic motor, the telescopic motor is used to drive the relative movement between the upper mold and the lower mold; a switching mechanism, the inner wall of the lower mold is provided with a switching mechanism, the switching mechanism is used to exhaust when the upper mold and the lower mold are closed; an air hole mechanism, the lower mold is provided with an air hole mechanism, the air hole mechanism is used to blow air when the upper mold and the lower mold are separated; a collecting mechanism, the lower mold is provided with a collecting mechanism, the collecting mechanism is used to collect impurities of the workpiece.

[0008] Preferably, the output shaft of the telescopic motor is fixedly connected to the top of the upper mold, a guide column is provided on the top of the lower mold, and the guide column on the top of the lower mold is slidably connected to the inner wall of the upper mold.

[0009] Preferably, the switching mechanism includes an air inlet pipe, which is fixedly connected to the inner wall of the lower mold, an air outlet pipe is fixedly connected to the inner wall of the lower mold, a hollow connecting cavity is provided on the inner wall of the lower mold, and a movable cavity is opened on the inner wall of the lower mold, a hollow air inlet block is fixedly connected to the inner wall of the air inlet pipe, a hollow air outlet block is fixedly connected to the inner wall of the air outlet pipe, one end of a spring is fixedly connected to the inner wall of the movable cavity, and the other end of the spring is fixedly connected to a switching strip block, a trigger column is fixedly connected to the top of the switching strip block, a hollow outer ring block and a hollow inner ring block are fixedly connected to the inner wall of the hollow connecting cavity, the inner wall of the hollow outer ring block is fixedly connected to the outer wall of the air inlet pipe, and the inner wall of the hollow inner ring block is fixedly connected to the outer wall of the air outlet pipe.

[0010] Preferably, there are four hollow connecting cavities, which are arranged in a circular array on the inner wall of the lower mold, the outer wall of the switching strip block is connected to the inner wall piston of the movable cavity, the outer wall of the switching strip block is respectively connected to the inner wall pistons of the hollow air inlet block and the hollow air outlet block, and a through hole is opened on the inner wall of the switching strip block.

[0011] Preferably, the tops of the hollow outer ring block and the hollow inner ring block are both provided with through holes, and the through holes of the hollow outer ring block and the hollow inner ring block are connected to the inner walls of each hollow connecting cavity.

[0012] Preferably, the air hole mechanism includes an inner accommodating cavity, the inner accommodating cavity is opened on the top of the lower mold, the top of the lower mold is provided with an outer accommodating cavity, the top of the inner accommodating cavity is provided with an inner circle of air holes, the inner wall of the lower mold is provided with middle air holes, the inner wall of the lower mold is provided with outer circle of air holes, and the inner wall of the lower mold is provided with a bottom cavity.

[0013] Preferably, the bottom cavity is interconnected with the inner wall of the hollow connecting cavity, and the inner wall of the bottom cavity is interconnected with the inner circle pores, the middle pores and the outer circle pores.

[0014] Preferably, the collecting mechanism includes a collecting frame and an installing frame, the collecting frame and the installing frame are magnetically connected, a through hole is provided on the inner wall of the installing frame, the through hole is used to connect the installing frame with the cavity of the bottom cavity, a filter net is fixedly connected to the bottom of the inner wall of the collecting frame, a conical filter element is fixedly connected to the inner wall of the collecting frame, and a mesh hole is provided on the conical filter element.

[0015] (III) Beneficial effects Compared with the prior art, the present invention provides a pulp molded container cover and a hot pressing mold thereof, which have the following beneficial effects: 1. The pulp molded container cover and its hot pressing mold are set by using a switching mechanism to start the telescopic motor to drive the upper mold and the lower mold to close the mold. Through the negative pressure transmission path, the gas in the mold is ensured to be discharged smoothly, and the bubbles and deformation of the pulp wet film during the molding process are reduced. The formation of negative pressure can effectively exclude the air inside the mold, improve the vacuum state inside the mold, and contribute to the molding accuracy and quality of the pulp molded container cover. The negative pressure effect can help to evenly press the pulp during the hot pressing process, avoid local overheating or overpressure, and ensure the uniformity of the final product.

[0016] 2. The pulp molding container cover and its hot pressing mold are arranged by using an air hole mechanism. Negative pressure drives the debris into the collection frame. The filter screen plays a filtering role. When the filter screen is blown by upward air, most of the debris in the collection frame will be blocked by the conical filter element, which helps to prevent the debris from contaminating subsequent equipment or molds, ensuring the long-term stable operation of the mold. Through effective filtering and diversion design, it is ensured that the debris or impurities generated during the hot pressing process can be collected and processed in time, ensuring the cleanliness of the mold and improving the molding quality.

[0017] 3. The pulp molded container cover and its hot pressing mold are arranged by a collecting mechanism. When the mold is separated, an air jet effect is generated to help the product demold, reduce adhesion, and make the mold separation process smoother. This high-pressure air helps to clean the inside of the mold, remove debris on the inner circle pores, the middle pores, and the outer circle pores, maintain the cleanliness of the mold, and can help quickly remove the residual material in the mold to avoid jamming due to mold adhesion during mold separation. The flow of high-pressure air not only helps cleaning, but also helps to quickly separate the mold, especially when performing multiple operations, to ensure that each use of the mold can maintain an efficient and stable working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic diagram of the overall structure of a pulp molded container cover and a hot pressing mold thereof proposed by the present invention; Figure 2 This is a schematic structural diagram of a bottom view of a pulp molded container cover proposed by the present invention; Figure 3 This is a schematic diagram of the top view of a pulp molded container cover proposed by the present invention; Figure 4 A schematic cross-sectional structure diagram of a lower mold of a hot pressing mold for a pulp molded container cover proposed by the present invention; Figure 5 A schematic cross-sectional structure diagram of a hollow air inlet block and a hollow air outlet block of a hot pressing mold for a pulp molded container cover proposed by the present invention; Figure 6 A schematic structural diagram of a hot pressing die vent mechanism for a pulp molded container cover proposed by the present invention; Figure 7 This is a schematic structural diagram of a bottom cavity of a hot pressing mold for a pulp molded container cover proposed by the present invention; Figure 8 The present invention is a schematic cross-sectional structure diagram of a collection frame and an installation frame of a hot pressing mold for a pulp molded container cover.

[0019] In the figure: 1. upper mold; 2. lower mold; 3. telescopic motor; 4. pulp molded container cover; 41. cover body; 42. annular groove; 43. arc-shaped connecting port; 44. handle; 5. switching mechanism; 51. air inlet pipe; 52. air outlet pipe; 53. hollow connecting cavity; 54. movable cavity; 55. hollow air inlet block; 56. hollow air outlet block; 57. spring; 58. switching strip block; 59. trigger column; 510. hollow outer ring block; 511. hollow inner ring block; 6. air hole mechanism; 61. inner accommodating cavity; 62. outer accommodating cavity; 63. inner circle air hole; 64. middle air hole; 65. outer circle air hole; 66. bottom cavity; 7. collecting mechanism; 71. collecting frame; 72. mounting frame; 73. bolt hole; 74. through hole; 75. filter screen; 76. conical filter element. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 - Figure 3A pulp molded container cover includes a pulp molded container cover 4, which includes: a cover body 41, a ring-shaped groove 42 is provided at the bottom of the cover body 41, and the ring-shaped groove 42 is used to dock and fix the opening part of the container to ensure the sealing of the container. An arc-shaped connecting port 43 is opened at the bottom of the cover body 41, and the arc-shaped connecting port 43 is used to connect with the contact part of the container to increase the stability of the cover body 41 and the container. A handle 44 is also provided on the cover body 41 to facilitate user operation and disassembly.

[0022] See also Figure 1 - Figure 8 , a hot pressing mold for a pulp molded container cover, applied to the above-mentioned pulp molded container cover, also includes: an upper mold 1, a lower mold 2, the upper mold 1 and the lower mold 2 are used together to hot press the pulp wet film to form a pulp molded container cover 4; a telescopic motor 3, the telescopic motor 3 is used to drive the relative movement between the upper mold 1 and the lower mold 2 to realize the mold closing and mold opening operations to complete the molding process; a switching mechanism 5, a switching mechanism 5 is arranged on the inner wall of the lower mold 2, and the switching mechanism 5 is used to exhaust when the upper mold 1 and the lower mold 2 are closed, to ensure that the air and water vapor in the mold can be discharged smoothly, to avoid uneven product forming or deformation due to gas retention, thereby improving the quality and precision of the product; a pore machine Structure 6, the lower mold 2 is provided with an air hole mechanism 6, the air hole mechanism 6 is used for blowing air when the upper mold 1 and the lower mold 2 are separated, so as to help the product to be smoothly demolded from the mold, reduce the demolding difficulty and improve the production efficiency; collecting mechanism 7, the lower mold 2 is provided with a collecting mechanism 7, the collecting mechanism 7 is used for collecting impurities of the workpiece, prevent the impurities from affecting the molding quality, ensure the cleanliness and precision of the product, the output shaft of the telescopic motor 3 is fixedly connected to the top of the upper mold 1, and the top of the lower mold 2 is provided with a guide column, and the guide column on the top of the lower mold 2 is slidably connected to the inner wall of the upper mold 1. Such a design can ensure the precise docking and motion guidance between the upper mold 1 and the lower mold 2, thereby realizing stable mold closing and mold opening operations, and improving the molding precision and efficiency of the mold.

[0023] The switching mechanism 5 includes an air inlet pipe 51, which is fixedly connected to the inner wall of the lower mold 2. An air outlet pipe 52 is fixedly connected to the inner wall of the lower mold 2. The air inlet pipe 51 is used to connect to an air compressor, and the air outlet pipe 52 is used to connect to a vacuum pump. The air compressor provides compressed air to the device through the air inlet pipe 51, and the vacuum pump discharges air or water vapor in the mold through the air outlet pipe 52 when the mold is closed, so as to ensure that there are no bubbles or gaps in the mold forming process to avoid affecting the product quality. A hollow connecting cavity 53 is provided on the inner wall of the lower mold 2, and an active cavity 54 is opened on the inner wall of the lower mold 2. A hollow air inlet block 55 is fixedly connected to the inner wall of the air inlet pipe 51, and a hollow air outlet block 56 is fixedly connected to the inner wall of the air outlet pipe 52. One end of a spring 57 is fixedly connected to the inner wall of the active cavity 54, and the other end of the spring 57 is fixedly connected to a switching strip block 58. A trigger column 59 is fixedly connected to the top of the switching strip block 58. The inner wall of the cavity 53 is fixedly connected with a hollow outer ring block 510 and a hollow inner ring block 511. The inner wall of the hollow outer ring block 510 is fixedly connected to the outer wall of the air inlet pipe 51, and the inner wall of the hollow inner ring block 511 is fixedly connected to the outer wall of the air outlet pipe 52. There are four hollow connection cavities 53, and the four hollow connection cavities 53 are arranged in a circumferential array on the inner wall of the lower mold 2. The outer wall of the switching strip block 58 is connected to the inner wall piston of the movable cavity 54. The switching The outer walls of the long strip block 58 are respectively connected to the inner wall pistons of the hollow air inlet block 55 and the hollow air outlet block 56. A through hole is opened on the inner wall of the switching long strip block 58. The tops of the hollow outer ring block 510 and the hollow inner ring block 511 are both provided with through holes. The through holes of the hollow outer ring block 510 and the hollow inner ring block 511 are connected to the inner walls of each hollow connecting cavity 53, further ensuring the uniformity of air circulation and preventing the molding quality from being affected by gas retention in local areas.

[0024] The pore mechanism 6 includes an inner accommodating cavity 61, which is opened at the top of the lower mold 2, an outer accommodating cavity 62 is opened at the top of the lower mold 2, an inner circle pore 63 is opened at the top of the inner accommodating cavity 61, an intermediate pore 64 is opened on the inner wall of the lower mold 2, an outer circle pore 65 is opened on the inner wall of the lower mold 2, and a bottom cavity 66 is opened on the inner wall of the lower mold 2. The bottom cavity 66 is interconnected with the inner wall of the hollow connecting cavity 53, and the inner wall of the bottom cavity 66 is interconnected with the inner circle pore 63, the intermediate pore 64, and the outer circle pore 65. These cavities provide space for the conduction of airflow, ensuring that the gas can flow evenly in the mold, avoiding uneven exhaust or local gas accumulation, resulting in forming defects. Through the setting of the bottom cavity 66, the airflow can form a smoother path in the mold, thereby improving the exhaust efficiency. The communication design between the bottom cavity 66 and the hollow connecting cavity 53 as well as the multiple air holes further ensures the uniform distribution of the airflow, thereby preventing a certain portion of the gas from being retained and affecting the hot pressing process.

[0025] The collecting mechanism 7 includes a collecting frame 71 and a mounting frame 72. The collecting frame 71 and the mounting frame 72 are connected by magnetism. The magnetic connection between the collecting frame 71 and the mounting frame 72 allows them to be easily assembled and disassembled, and is convenient for cleaning and maintenance. A bolt hole 73 is provided on the top of the mounting frame 72. The bolt hole 73 is used to fix the mounting frame 72 to the surface of the lower mold 2. A through hole 74 is provided on the inner wall of the mounting frame 72. The through hole 74 is used to connect the mounting frame 72 with the cavity of the bottom cavity 66. A filter screen 75 is fixedly connected to the bottom of the inner wall of the collecting frame 71. A conical filter element 76 is fixedly connected to the inner wall of the collecting frame 71. The conical filter element 76 is provided with mesh holes. The debris on the lower mold 2 enters the bottom cavity 66 through the inner circle air holes 63, the middle air holes 64, and the outer circle air holes 65, and then passes through the through hole 74 to enter the inner wall of the mounting frame 72, and then the debris passes through the conical filter 76 to enter the collecting frame 71. The filter screen 75 plays a filtering role. When the filter screen 75 is blown by the upward air, most of the debris in the collecting frame 71 will be blocked by the conical filter 76, which helps to prevent the debris from contaminating subsequent equipment or molds, ensuring the long-term stable operation of the mold. Through effective filtering and diversion design, it is ensured that the debris or impurities generated during the hot pressing process can be collected and processed in time, ensuring the cleanliness of the mold and improving the molding quality.

[0026] In summary, when the pulp molding container cover and the hot pressing mold thereof are used, the telescopic motor 3 is turned on to drive the upper mold 1 and the lower mold 2 to close the mold. At this time, the upper mold 1 contacts the trigger column 59 and the switching strip block 58 moves downward, so that the switching strip block 58 drives the through hole to the cavity where the hollow air outlet block 56 is located, so that the hollow pump connected to the air outlet pipe 52 passes the negative pressure through the air outlet pipe 52, the hollow air outlet block 56, the hollow inner ring block 511, the hollow connecting cavity 53, the bottom cavity 66, and then through the inner ring air hole 63, The middle air hole 64 and the outer ring air hole 65 transfer the negative pressure to the top of the lower mold 2. Through the above-mentioned negative pressure transmission path, the gas in the mold can be discharged smoothly, reducing the bubbles and deformation of the pulp wet film during the molding process. The formation of negative pressure can effectively eliminate the air inside the mold and improve the vacuum state inside the mold, which is helpful for the molding accuracy and quality of the pulp molded container cover 4. The negative pressure effect can help to evenly press the pulp during the hot pressing process, avoid local overheating or overpressure, and ensure the uniformity of the final product.

[0027] At the same time, negative pressure drives the debris to enter the bottom cavity 66 through the inner circle air holes 63, the middle air holes 64, and the outer circle air holes 65, and then pass through the through hole 74 to enter the inner wall of the mounting frame 72, and then the debris passes through the conical filter 76 to enter the collecting frame 71. The filter screen 75 plays a filtering role. When the filter screen 75 is blown upward by air, most of the debris in the collecting frame 71 will be blocked by the conical filter 76, which helps to prevent the debris from contaminating subsequent equipment or molds, ensuring the long-term stable operation of the mold. Through effective filtering and diversion design, it is ensured that the debris or impurities generated during the hot pressing process can be collected and processed in time, ensuring the cleanliness of the mold and improving the molding quality.

[0028] When the mold is separated, the spring 57 drives the switching strip block 58 to move upward, and the through hole on the switching strip block 58 moves to the inner wall of the hollow air inlet block 55, so that the inner wall of the hollow air outlet block 56 is blocked, preventing air from flowing out through the air outlet pipe 52, ensuring that the previous negative pressure channel is closed, and the high-pressure air of the air compressor is passed through the air inlet pipe 51 through the air inlet pipe 51, the hollow air inlet block 55, the hollow outer ring block 510, the hollow connecting cavity 53, and the bottom cavity 66, and then through the inner circle air hole 63, the middle air hole 64, and the outer circle air hole 65 to pass the high-pressure air to the top of the lower mold 2. The high-pressure air will pass through the inner circle air hole 63, the middle air hole 64, and the outer circle air hole 65. Hole 64 and outer ring air holes 65 are distributed on the top of the mold, generating an air jet effect to help demold the product, reduce adhesion, and make the mold separation process smoother. This high-pressure air helps to clean the inside of the mold, remove debris on the inner ring air holes 63, the middle air holes 64, and the outer ring air holes 65, and maintain the cleanliness of the mold. It can help to quickly remove the residual materials in the mold and avoid jamming due to mold adhesion during mold separation. The flow of high-pressure air not only helps cleaning, but also helps to quickly separate the mold, especially when performing multiple operations, to ensure that each use of the mold can maintain an efficient and stable working state.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A pulp molded container cover, comprising a pulp molded container cover (4), characterized in that: The pulp molded container cover (4) comprises a cover body (41), the bottom of the cover body (41) is provided with an annular groove (42), the bottom of the cover body (41) is provided with an arc-shaped connecting opening (43), and the cover body (41) is also provided with a handle (44).

2. A hot pressing mold for pulp molding container cover, characterized in that: A pulp molded container cover as claimed in claim 1, further comprising: Upper mold (1), A lower mold (2), the upper mold (1) and the lower mold (2) are used in conjunction with each other; A telescopic motor (3), the telescopic motor (3) being used to drive the relative movement between the upper mold (1) and the lower mold (2); A switching mechanism (5), wherein the inner wall of the lower mold (2) is provided with a switching mechanism (5), and the switching mechanism (5) is used to exhaust air when the upper mold (1) and the lower mold (2) are closed; An air hole mechanism (6), wherein the lower mold (2) is provided with an air hole mechanism (6), and the air hole mechanism (6) is used for blowing air when the upper mold (1) and the lower mold (2) are separated; A collecting mechanism (7), wherein the lower mold (2) is provided with a collecting mechanism (7), and the collecting mechanism (7) is used to collect impurities of the workpiece.

3. The hot pressing mold for pulp molding container cover according to claim 2, characterized in that: The output shaft of the telescopic motor (3) is fixedly connected to the top of the upper mold (1), and a guide column is provided on the top of the lower mold (2). The guide column on the top of the lower mold (2) is slidably connected to the inner wall of the upper mold (1).

4. The hot pressing mold for pulp molding container cover according to claim 2, characterized in that: The switching mechanism (5) comprises an air inlet pipe (51), the air inlet pipe (51) being fixedly connected to the inner wall of the lower mold (2), an air outlet pipe (52) being fixedly connected to the inner wall of the lower mold (2), a hollow connecting cavity (53) being provided on the inner wall of the lower mold (2), a movable cavity (54) being provided on the inner wall of the lower mold (2), a hollow air inlet block (55) being fixedly connected to the inner wall of the air inlet pipe (51), a hollow air outlet block (56) being fixedly connected to the inner wall of the air outlet pipe (52), and the movable cavity (54). 4), one end of a spring (57) is fixedly connected to the inner wall of the hollow connecting cavity (53), the other end of the spring (57) is fixedly connected to a switching strip block (58), the top of the switching strip block (58) is fixedly connected to a trigger column (59), and a hollow outer ring block (510) and a hollow inner ring block (511) are fixedly connected to the inner wall of the hollow connecting cavity (53), the inner wall of the hollow outer ring block (510) is fixedly connected to the outer wall of the air inlet pipe (51), and the inner wall of the hollow inner ring block (511) is fixedly connected to the outer wall of the air outlet pipe (52).

5. The hot pressing mold for pulp molding container cover according to claim 4, characterized in that: Four hollow connecting cavities (53) are provided, and the four hollow connecting cavities (53) are arranged in a circular array on the inner wall of the lower mold (2); the outer wall of the switching strip block (58) is connected to the inner wall piston of the movable cavity (54); the outer wall of the switching strip block (58) is connected to the inner wall pistons of the hollow air inlet block (55) and the hollow air outlet block (56), respectively; and a through hole is opened on the inner wall of the switching strip block (58).

6. The hot pressing mold for pulp molded container cover according to claim 5, characterized in that: Through holes are provided on the tops of the hollow outer ring-shaped block (510) and the hollow inner ring-shaped block (511), and the through holes of the hollow outer ring-shaped block (510) and the hollow inner ring-shaped block (511) are connected to the inner walls of each hollow connection cavity (53).

7. The hot pressing mold for pulp molded container cover according to claim 6, characterized in that: The air hole mechanism (6) comprises an inner receiving cavity (61), the inner receiving cavity (61) is opened on the top of the lower mold (2), the top of the lower mold (2) is provided with an outer receiving cavity (62), the top of the inner receiving cavity (61) is provided with an inner circle of air holes (63), the inner wall of the lower mold (2) is provided with middle air holes (64), the inner wall of the lower mold (2) is provided with outer circle of air holes (65), and the inner wall of the lower mold (2) is provided with a bottom cavity (66).

8. The hot pressing mold for pulp molded container cover according to claim 7, characterized in that: The bottom cavity (66) is in communication with the inner wall of the hollow connecting cavity (53), and the inner wall of the bottom cavity (66) is in communication with the inner circle air holes (63), the middle air holes (64), and the outer circle air holes (65).

9. The hot pressing mold for pulp molded container cover according to claim 8, characterized in that: The collecting mechanism (7) comprises a collecting frame (71) and a mounting frame (72); the collecting frame (71) and the mounting frame (72) are connected to each other by means of magnetism; a through hole (74) is provided on the inner wall of the mounting frame (72); the through hole (74) is used to connect the mounting frame (72) with the cavity of the bottom cavity (66); a filter screen (75) is fixedly connected to the bottom of the inner wall of the collecting frame (71); a conical filter element (76) is fixedly connected to the inner wall of the collecting frame (71); and a mesh is provided on the conical filter element (76).

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