Preparation method of leakage-proof plastic cup cover

Abstract

The invention discloses a preparation method of a leakproof plastic cup lid, which comprises the following steps: S1, taking high-density polyethylene and thermoplastic elastomer as main raw materials, and taking a filler, an antioxidant and a lubricant as auxiliary additives, so that the raw materials and the auxiliary additives are fully and uniformly mixed; s2, adding the uniformly mixed raw materials into a charging barrel of an injection molding machine for melting, and carrying out injection molding by adopting an injection mold; s3, the formed cup cover is cooled in the mold, so that the cup cover is fully shaped; s4, the taken-out cup cover is put into a burr cleaning mechanism for deburring treatment.The manufacturing method enables the cup cover to be compact in structure and uniform in texture after being formed, so that liquid is effectively prevented from leaking from the cup cover, burrs at an opening of the cup cover are effectively removed in an automatic centrifugal deburring mode, the sealing effect of the cup cover is further improved, and the quality of the cup cover is improved. And the leakage condition caused by gaps caused by burrs is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of plastic cup covers, and in particular to a method for preparing a leak-proof plastic cup cover. Background Art

[0002] Plastic cups are generally composed of a cup body and a cup cover. Traditional plastic cup covers often have deficiencies in leak-proof performance.

[0003] On the one hand, its raw material formula is not scientific and reasonable enough, and only a single plastic material is used, such as ordinary polyethylene or polypropylene. In some cases, a single material is difficult to take into account hardness, toughness and sealing performance. For example, although pure polyethylene material has certain flexibility, its hardness is relatively low. When it is squeezed by external force or temperature changes, it is easy to deform, resulting in failure of the seal between the cup lid and the cup body, and liquid leakage. This brings many inconveniences to users, especially when carrying drinks out, which may cause clothes, bags, etc. to be soaked and damaged by liquids.

[0004] On the other hand, the preparation process of traditional cup lids is relatively simple. In the raw material mixing stage, there is a lack of precise control over parameters such as mixing temperature and time, which can easily lead to uneven mixing of raw materials, thereby affecting the quality stability of the cup lids. During the injection molding process, the setting of key process parameters such as barrel temperature, mold temperature, injection pressure and holding time is often based on experience, and there is a lack of systematic research and optimization, which makes it easy for the cup lids to have problems such as internal stress concentration and large dimensional deviations during the molding process. These defects will not only reduce the leak-proof performance of the cup lids, but also affect their service life. Traditional deburring processes mostly use manual operations or simple mechanical grinding, which are inefficient and difficult to ensure the consistency and thoroughness of deburring. The burred cup mouth will destroy the sealing fit between the cup lid and the cup body, thereby causing leakage. Summary of the invention

[0005] The purpose of the present invention is to propose a method for preparing a leak-proof plastic cup cover to solve the technical problem that the sealing fit between the cup cover and the cup body is unstable and the leak-proof performance cannot be guaranteed in the traditional cup cover preparation process.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A method for preparing a leakproof plastic cup cover comprises the following steps:

[0008] S1. Use high-density polyethylene and thermoplastic elastomer as main raw materials, and use filler, antioxidant and lubricant as auxiliary material additives, add the raw materials and auxiliary material additives into a mixer, stir at a temperature of 70-85°C for 8-14 minutes, so that the raw materials and auxiliary material additives are fully mixed;

[0009] S2. Add the mixed raw materials into the barrel of the injection molding machine, set the barrel temperature at 160-220°C to melt the raw materials, and use an injection mold for injection molding. The temperature of the mold is controlled at 45-65°C. During the injection molding process, the injection pressure is set to 70-125MPa, and the holding time is 2-6 seconds;

[0010] S3. After the injection molding is completed, the molded cup cover is cooled in the mold for 20-25 seconds to fully shape the cup cover, and then the cup cover is taken out of the mold;

[0011] S4, placing the taken-out cup cover into a burr cleaning mechanism for deburring, and then taking the cup cover out of the burr cleaning mechanism, thus completing the production of the leakproof plastic cup cover.

[0012] As a preferred embodiment of the present invention, the filler in S1 is a calcium carbonate filler, the antioxidant is a hindered phenol antioxidant, and the lubricant is a calcium stearate lubricant;

[0013] Among them, the proportion of high-density polyethylene is 65%, the proportion of thermoplastic elastomer is 23%, the proportion of filler is 10%, the proportion of antioxidant is 0.5%, and the proportion of lubricant is 1.5%.

[0014] As a preferred embodiment of the present invention, the burr cleaning mechanism in S4 includes a mounting seat, a first support plate is fixedly mounted on one end of the top of the mounting seat, a bearing is fixedly mounted on the first support plate, a connecting rod is fixedly mounted in the inner ring of the bearing, a driving motor is fixedly mounted on one side of the first support plate, one end of the connecting rod is fixedly connected to the output shaft of the driving motor, and the other end is fixedly connected to a grinding cylinder.

[0015] A material opening is provided on the grinding cylinder, and the material opening is sealed by a cover plate, and the cover plate is fixedly connected to the grinding cylinder by a first bolt.

[0016] A mounting plate is detachably installed inside the grinding cylinder, two pressure strips are installed in parallel on the top of the mounting plate, arc-shaped clamping plates are fixedly installed on opposite sides of the two pressure strips, the cup cover is fixedly clamped between the two symmetrically arranged arc-shaped clamping plates, and the two pressure strips are connected by a third bolt.

[0017] Among them, a first sliding groove is opened on the top of the mounting plate, and a sliding block is slidably installed inside the first sliding groove, and the upper end of the sliding block is fixedly connected to the bottom of the pressure strip.

[0018] As a further solution of the present invention, a socket is provided at one end of the grinding cylinder, a mounting plate is inserted into the socket, a pressure plate is fixedly installed at one end of the mounting plate, the pressure plate is fixedly installed at one end of the grinding cylinder by a second bolt, and the pressure plate blocks the socket.

[0019] One end of the grinding cylinder is provided with a pressing groove, a pressing plate is engaged and clamped in the pressing groove, and a handle is fixedly installed on one side of the pressing plate.

[0020] As a further solution of the present invention, a slot is provided at one end of the grinding cylinder, and a block is fixedly installed at one end of the mounting plate extending into the grinding cylinder. When the pressure plate fixes and seals the jack, the block is engaged and connected to the inside of the slot.

[0021] As a preferred solution of the present invention, a rubber pad is fixedly mounted on the clamping surface of the arc-shaped clamping plate.

[0022] As a preferred solution of the present invention, a limiting groove is provided on the mounting plate, and the cup cover is clamped inside the limiting groove.

[0023] As a preferred solution of the present invention, a second support plate is fixedly installed on the top of one end of the mounting seat, a slide seat is fixedly installed on the top of the second support plate, a second slide groove is opened on the slide seat, a guide rail is fixedly installed on the outer wall of one end of the grinding cylinder, and the guide rail is slidably installed inside the second slide groove.

[0024] As a further solution of the present invention, an observation window is provided on the grinding cylinder.

[0025] As a further preferred embodiment of the present invention, the top of the mounting plate faces the material opening, and the cover opening of the fixed cup cover is aligned with the material opening.

[0026] Compared with the prior art, the method for preparing a leak-proof plastic cup lid provided by the present invention has the following beneficial effects:

[0027] 1. By selecting high-density polyethylene and thermoplastic elastomer as the main materials, and using fillers, antioxidants and lubricants as auxiliary additives, combined with specific injection molding process parameters, the cup cover has a compact structure and uniform texture after molding. During the injection molding process, the injection pressure, holding time and mold temperature are precisely controlled to ensure the dimensional accuracy and density of each part of the cup cover, thereby effectively preventing liquid from leaking from the cup cover, and can reliably meet the daily leakage prevention needs of various beverages.

[0028] The deburring process uses an automated centrifugal deburring method, which can improve processing efficiency, effectively remove burrs at the mouth of the cup lid, further improve the sealing effect of the cup lid, and achieve a more fitting sealing contact between the cup lid and the cup, avoiding leakage due to gaps caused by burrs.

[0029] 2. The connection method between the mounting plate and the grinding cylinder is a socket, a pressure plate and a second bolt, so that the installation and removal process of the mounting plate is simple and easy, and the mounting plate is convenient for putting in and taking out from the inside of the grinding cylinder, and the feeding and discharging of the cup cover are convenient, thereby improving production efficiency.

[0030] 3. By fixing a rubber pad on the clamping surface of the arc-shaped clamping plate, the rubber pad can play a buffering role in the process of fixing the cup cover to avoid causing clamping marks or damage to the surface of the cup cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only examples of the embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 is a flow chart of an embodiment of the present invention;

[0033] Figure 2 It is an overall three-dimensional schematic diagram of the burr cleaning mechanism in an embodiment of the present invention;

[0034] Figure 3 It is a cross-sectional schematic diagram of a grinding cylinder in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the jack structure in an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the cup cover installation and fixing structure in an embodiment of the present invention;

[0037] Figure 6 For the present invention Figure 5 The structure of the middle A part is enlarged;

[0038] Figure 7 Schematic diagram of the arc-shaped splint structure in an embodiment of the present invention.

[0039] Reference numerals:

[0040] 1. Mounting seat; 2. First support plate; 201. Bearing; 202. Connecting rod; 3. Driving motor; 4. Grinding cylinder; 401. Material inlet; 402. Cover plate; 403. First bolt; 404. Socket; 405. Pressing groove; 406. Clamping groove; 407. Guide rail; 5. Mounting plate; 501. Pressing plate; 502. Second bolt; 503. Handle; 504. First slide groove; 505. Sliding block; 506. Limiting groove; 507. Clamping block; 6. Pressing strip; 601. Arc splint; 602. Rubber pad; 603. Third bolt; 7. Cup cover; 8. Second support plate; 9. Sliding seat; 901. Second slide groove; 10. Observation window. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the embodiments of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0044] Participation Figures 1 to 7 As shown, a method for preparing a leak-proof plastic cup lid according to an embodiment of the present invention comprises the following steps: S1, using high-density polyethylene and thermoplastic elastomer as main raw materials, and using fillers, antioxidants and lubricants as auxiliary additives, adding the raw materials and auxiliary additives into a mixer, stirring at a temperature of 70-85°C for 8-14 minutes, so that the raw materials and auxiliary additives are fully mixed; S2, adding the mixed raw materials into the barrel of an injection molding machine, setting the barrel temperature at 160-220°C, melting the raw materials, and taking Injection molding is performed using an injection mold, and the temperature of the mold is controlled at 45-65°C. During the injection molding process, the injection pressure is set to 70-125MPa, and the holding time is 2-6 seconds; S3, after the injection molding is completed, the molded cup cover 7 is cooled in the mold for 20-25 seconds to fully shape the cup cover 7, and then the cup cover 7 is taken out from the mold; S4, the taken out cup cover 7 is placed in a burr cleaning mechanism for deburring, and then the cup cover 7 is taken out from the burr cleaning mechanism, and the production of the leak-proof plastic cup cover is completed.

[0045] High-density polyethylene and thermoplastic elastomer are selected as the main materials, combined with specific injection molding process parameters, so that the cup cover 7 has a tight structure and uniform texture after molding. During the injection molding process, the injection pressure, holding time and mold temperature are precisely controlled to ensure the dimensional accuracy and density of each part of the cup cover 7. This effectively prevents liquid from leaking from the cup cover 7 and can reliably meet the daily leakage prevention needs of various beverages. The deburring process further improves the sealing effect of the cup cover 7, because after removing the burrs on the edge and inner surface of the cover, the cup cover 7 and the cup can achieve a more fitting sealing contact, avoiding leakage due to gaps caused by burrs.

[0046] Among them, the density of high-density polyethylene (HDPE) ranges from 0.941 to 0.960 g / cm³.

[0047] The filler in S1 is a calcium carbonate filler, the antioxidant is a hindered phenol antioxidant, and the lubricant is a calcium stearate lubricant; wherein the ratio of high-density polyethylene is 65%, the ratio of thermoplastic elastomer is 23%, the ratio of filler is 10%, the ratio of antioxidant is 0.5%, and the ratio of lubricant is 1.5%.

[0048] High-density polyethylene provides a certain hardness and strength basis, so that the cup cover 7 is not easily deformed or damaged due to external force squeezing, collision, etc. The addition of thermoplastic elastomer effectively improves the toughness of the cup cover, so that it can withstand a certain degree of impact force when impacted and is not easy to break, thereby extending the service life of the cup cover. The calcium carbonate filler helps to enhance the dimensional stability of the cup cover 7. The cup cover 7 can maintain its shape and size under different temperature environments, and will not easily have problems such as shrinkage and warping that affect the use and sealing performance. The use of hindered phenol antioxidants can effectively inhibit the oxidation reaction of plastics during the processing and subsequent use, and slow down the aging and brittleness of materials caused by oxidation. Calcium stearate lubricant calcium stearate can form a lubricating film on the surface of the raw material, reduce the friction between the raw material and the processing equipment, make the processing process smoother, reduce energy consumption, and improve production efficiency.

[0049] The burr cleaning mechanism in S4 includes a mounting seat 1, a first support plate 2 is fixedly mounted on one end of the top of the mounting seat 1, a bearing 201 is fixedly mounted on the first support plate 2, a connecting rod 202 is fixedly mounted in the inner ring of the bearing 201, a driving motor 3 is fixedly mounted on one side of the first support plate 2, one end of the connecting rod 202 is fixedly connected to the output shaft of the driving motor 3, and the other end is fixedly connected to a grinding cylinder 4; a material port 401 is opened on the grinding cylinder 4, the material port 401 is sealed by a cover plate 402, and the cover plate 402 is fixedly connected by a first bolt 403. It is fixedly connected to the grinding cylinder 4; a mounting plate 5 is detachably installed inside the grinding cylinder 4, and two pressure strips 6 are installed in parallel on the top of the mounting plate 5, and arc-shaped clamping plates 601 are fixedly installed on the opposite sides of the two pressure strips 6, and the cup cover 7 is fixedly clamped between the two symmetrically arranged arc-shaped clamping plates 601, and the two pressure strips 6 are connected by a third bolt 603; wherein, a first slide groove 504 is opened on the top of the mounting plate 5, and a slider 505 is slidably installed inside the first slide groove 504, and the upper end of the slider 505 is fixedly connected to the bottom of the pressure strip 6.

[0050] By putting a proper amount of abrasive into the grinding cylinder 4, and putting the cup cover 7 to be polished into the grinding cylinder 4, the driving motor 3 drives the grinding cylinder 4 to rotate, and the centrifugal force generated by the high-speed rotation is utilized. Under the action of the centrifugal force, the abrasive is thrown onto the surface of the cup cover 7, and the edge and inner surface of the cup cover 7 can contact with the abrasive, so that the burr removal process can be effectively performed.

[0051] The material port 401 and the detachable cover plate 402 facilitate the placement and removal of the abrasive. The two pressure strips 6 are connected by a third bolt 603, and the slider 505 at the bottom of the pressure strip 6 can slide in the first slide groove 504 at the top of the mounting plate 5, so that the distance between the two arc-shaped clamping plates 601 can be easily adjusted, which is convenient for the disassembly and assembly of the cup cover 7.

[0052] A socket 404 is provided at one end of the grinding cylinder 4, and the mounting plate 5 is inserted into the inside of the socket 404. A pressing plate 501 is fixedly installed at one end of the mounting plate 5. The pressing plate 501 is fixedly installed on one end of the grinding cylinder 4 through a second bolt 502, and the pressing plate 501 blocks the socket 404; wherein, a pressing groove 405 is provided at one end of the grinding cylinder 4, and the pressing plate 501 is engaged and clamped in the inside of the pressing groove 405, and a handle 503 is fixedly installed on one side of the pressing plate 501.

[0053] The above technical solution adopts a connection method between the mounting plate 5 and the grinding cylinder 4 using the socket 404, the pressure plate 501 and the second bolt 502, so that the installation and disassembly process of the mounting plate 5 is simple and easy, and it is convenient to put the mounting plate 5 into and take it out from the inside of the grinding cylinder 4, and it is convenient to feed and discharge the cup cover 7, thereby improving production efficiency.

[0054] A slot 406 is provided at one end of the grinding cylinder 4 , and a block 507 is fixedly installed at one end of the mounting plate 5 extending into the grinding cylinder 4 . When the pressing plate 501 fixes and blocks the insertion hole 404 , the block 507 is engaged and connected to the inside of the slot 406 .

[0055] By engaging the clamping block 507 on the mounting plate 5 with the clamping groove 406 inside the grinding cylinder 4, the stability of the mounting plate 5 can be increased, and the quality of grinding the cup cover 7 can be further improved.

[0056] A rubber pad 602 is fixedly mounted on the clamping surface of the arc-shaped clamping plate 601 . In the process of fixing the cup cover 7 , the rubber pad 602 can play a buffering role to avoid causing clamping marks or damage to the surface of the cup cover 7 .

[0057] A limiting groove 506 is provided on the mounting plate 5, and the cup cover 7 is snapped into the limiting groove 506, so that the cup cover 7 can be snapped into it, thereby further fixing the position of the cup cover 7, preventing the cup cover 7 from being displaced and damaged during the grinding process, and ensuring the integrity and appearance quality of the cup cover 7.

[0058] A second support plate 8 is fixedly installed on the top of one end of the mounting seat 1, a slide seat 9 is fixedly installed on the top of the second support plate 8, a second slide groove 901 is opened on the slide seat 9, a guide rail 407 is fixedly installed on the outer wall of one end of the grinding cylinder 4, and the guide rail 407 is slidably installed inside the second slide groove 901, so as to further increase the stability of the rotation output of the grinding cylinder 4.

[0059] An observation window 10 is provided on the grinding cylinder 4 so that the operator can observe the deburring of the cup cover 7 in real time and timely discover problems that may occur during the grinding process through the observation window.

[0060] The top of the mounting plate 5 faces the material opening 401, and the cover opening of the fixed cup cover 7 is aligned with the material opening 401. When the abrasive needs to be replaced, the material opening 401 of the grinding cylinder 4 faces downward, and the cover opening of the cup cover 7 faces downward to avoid residual abrasive inside the cup cover 7.

[0061] It is worth noting that the second bolt 502 and the third bolt 603 are handle bolts, which are convenient for personnel to quickly adjust and operate.

[0062] The abrasive can be nylon or ceramic abrasive.

[0063] The working principle of the embodiment of the present invention is as follows:

[0064] Weigh the raw materials in proportion: accurately weigh 65% high-density polyethylene, 23% thermoplastic elastomer, 10% calcium carbonate filler, 0.5% hindered phenol antioxidant and 1.5% calcium stearate lubricant, add the raw materials and auxiliary additives into the mixer, stir at 70-85°C for 8-14 minutes to fully mix the raw materials and auxiliary additives, add the mixed raw materials into the barrel of the injection molding machine, set the barrel temperature at 160-220°C to melt the raw materials, and use an injection mold for injection molding, and control the temperature of the mold at 45-65°C.

[0065] During the injection molding process, the injection pressure is set to 70-125 MPa, and the holding time is 2-6 seconds. After the injection molding is completed, the molded cup cover 7 is cooled in the mold for 20-25 seconds to fully shape the cup cover 7 and then the cup cover 7 is taken out of the mold.

[0066] Put the taken out cup cover into the burr cleaning mechanism, open the cover plate 402 on the grinding cylinder 4, pour a proper amount of abrasive into the grinding cylinder 4, the abrasive can be nylon or ceramic abrasive, and fix the cover plate 402 here, pull the mounting plate 5 out from the inside of the grinding cylinder 4 through the socket 404, and adjust the distance between the two pressure strips 6 by loosening the third bolt 603, so that the cup cover 7 can be placed between the arc-shaped clamping plates 601 on the mounting plate for fixing. The clamping surface of the arc-shaped clamping plate 601 is fixed with a rubber pad 602, which can effectively protect the surface of the cup cover 7 from being clamped. At the same time, the cup cover 7 can be clamped in the limiting groove 506 of the mounting plate 5 to further fix its position to prevent displacement in subsequent operations, and tighten the third bolt 60 3, make the arc-shaped clamping plate 601 firmly clamp the cup cover 7, then insert the mounting plate 5 into the grinding cylinder 4 through the insertion hole 404, make the pressing plate 501 at one end of the mounting plate 5 fit in the pressing groove 405 at one end of the grinding cylinder 4, and use the second bolt 502 to fix the pressing plate 501 on the grinding cylinder 4, at this time, the clamping block 507 on the mounting plate 5 is also fit in the clamping groove 406 inside the grinding cylinder 4, ensure that the mounting plate 5 is firmly connected to the grinding cylinder 4, then start the driving motor 3 to drive the grinding cylinder 4 to rotate, use the centrifugal force generated by high-speed rotation, under the action of centrifugal force, the abrasive is thrown to the surface of the cup cover 7, the cover edge and inner surface of the cup cover 7 can contact with the abrasive, and can effectively deburr.

[0067] During the grinding process, one end of the grinding cylinder 4 is supported by the slide seat 9, which further increases the stability of the rotation output of the grinding cylinder 4. The operator can observe the deburring of the cup cover 7 in real time through the observation window 10 on the grinding cylinder 4.

[0068] The above shows and describes the basic principles of the present invention. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only intended to illustrate the principles of the present invention. Without departing from the scope of the present invention, any modifications, equivalent substitutions and improvements made within the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a leakproof plastic cup lid, characterized in that The following steps are involved: S1. Use high-density polyethylene and thermoplastic elastomer as main raw materials, and use filler, antioxidant and lubricant as auxiliary material additives, add the raw materials and auxiliary material additives into a mixer, stir at a temperature of 70-85°C for 8-14 minutes, so that the raw materials and auxiliary material additives are fully mixed; S2. Add the mixed raw materials into the barrel of the injection molding machine, set the barrel temperature at 160-220°C to melt the raw materials, and use an injection mold for injection molding. The temperature of the mold is controlled at 45-65°C. During the injection molding process, the injection pressure is set to 70-125MPa, and the holding time is 2-6 seconds; S3, after the injection molding is completed, the molded cup cover (7) is cooled in the mold for 20-25 seconds to allow the cup cover (7) to be fully shaped, and then the cup cover (7) is removed from the mold; S4, placing the removed cup cover (7) into a burr cleaning mechanism for deburring, and then removing the cup cover (7) from the burr cleaning mechanism, thereby completing the manufacture of the leakproof plastic cup cover.

2. The method for preparing a leakproof plastic cup cover according to claim 1, characterized in that: The filler in S1 is a calcium carbonate filler, the antioxidant is a hindered phenol antioxidant, and the lubricant is a calcium stearate lubricant; Among them, the ratio of high-density polyethylene is 65%, the ratio of thermoplastic elastomer is 23%, the ratio of filler is 10%, the ratio of antioxidant is 0.5%, and the ratio of lubricant is 1.5%.

3. The method for preparing a leakproof plastic cup cover according to claim 1, characterized in that: The burr cleaning mechanism in S4 comprises a mounting seat (1), a first support plate (2) is fixedly mounted on one end of the top of the mounting seat (1), a bearing (201) is fixedly mounted on the first support plate (2), a connecting rod (202) is fixedly mounted in the inner ring of the bearing (201), a driving motor (3) is fixedly mounted on one side of the first support plate (2), one end of the connecting rod (202) is fixedly connected to the output shaft of the driving motor (3), and the other end is fixedly connected to a grinding cylinder (4); The grinding cylinder (4) is provided with a material opening (401), the material opening (401) is sealed by a cover plate (402), and the cover plate (402) is fixedly connected to the grinding cylinder (4) by a first bolt (403); A mounting plate (5) is detachably mounted inside the grinding cylinder (4), two pressure strips (6) are mounted in parallel on the top of the mounting plate (5), arc-shaped clamping plates (601) are fixedly mounted on opposite sides of the two pressure strips (6), the cup cover (7) is fixedly clamped between the two symmetrically arranged arc-shaped clamping plates (601), and the two pressure strips (6) are connected via a third bolt (603); A first slide groove (504) is provided on the top of the mounting plate (5), a slider (505) is slidably mounted inside the first slide groove (504), and the upper end of the slider (505) is fixedly connected to the bottom of the pressure strip (6).

4. The method for preparing a leakproof plastic cup cover according to claim 3, characterized in that: One end of the grinding cylinder (4) is provided with an insertion hole (404), the mounting plate (5) is inserted into the interior of the insertion hole (404), one end of the mounting plate (5) is fixedly mounted with a pressing plate (501), the pressing plate (501) is fixedly mounted on one end of the grinding cylinder (4) by means of a second bolt (502), and the pressing plate (501) blocks the insertion hole (404); A pressing groove (405) is provided at one end of the grinding cylinder (4), the pressing plate (501) is engaged and clamped in the pressing groove (405), and a handle (503) is fixedly mounted on one side of the pressing plate (501).

5. The method for preparing a leakproof plastic cup cover according to claim 4, characterized in that: A slot (406) is provided at one end of the interior of the grinding cylinder (4); a block (507) is fixedly mounted at one end of the mounting plate (5) extending into the interior of the grinding cylinder (4); when the pressing plate (501) fixes and blocks the insertion hole (404), the block (507) is engaged and clamped in the slot (406).

6. The method for preparing a leakproof plastic cup cover according to claim 3, characterized in that: A rubber pad (602) is fixedly mounted on the clamping surface of the arc-shaped clamping plate (601).

7. The method for preparing a leakproof plastic cup cover according to claim 3, characterized in that: The mounting plate (5) is provided with a limiting groove (506), and the cup cover (7) is clamped inside the limiting groove (506).

8. The method for preparing a leakproof plastic cup cover according to claim 3, characterized in that: A second support plate (8) is fixedly mounted on the top of one end of the mounting seat (1), a slide seat (9) is fixedly mounted on the top of the second support plate (8), a second slide groove (901) is provided on the slide seat (9), and a guide rail (407) is fixedly mounted on the outer wall of one end of the grinding cylinder (4), and the guide rail (407) is slidably mounted inside the second slide groove (901).

9. The method for preparing a leakproof plastic cup cover according to claim 8, characterized in that: The grinding cylinder (4) is provided with an observation window (10).

10. The method for preparing a leakproof plastic cup cover according to claim 3, characterized in that: The top of the mounting plate (5) faces the material opening (401), and the cover opening of the fixed cup cover (7) is aligned with the material opening (401).

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