Anti-blocking treatment scheme for vent holes of mold of plastic vacuum forming machine

Abstract

The invention relates to the field of plastic product production, in particular to an anti-blocking treatment scheme for a vent hole of a plastic vacuum forming machine mold, which comprises the following steps: S1, disassembling a mold: taking down the mold from a mold table; s2, checking the mold: detecting whether the number of the vent holes punched in the mold is an even number or not, and punching another vent hole if the number of the vent holes punched in the mold is an odd number; s3, anti-blocking alarms are installed, specifically, a plurality of anti-blocking alarms are taken and used, and two inserting needles of the anti-blocking alarms are inserted into two vent holes of the mold from the lower portion; s4, the mold is mounted back, specifically, the mold is mounted back to the mold table; s5, blockage alarm is conducted, specifically, the plastic vacuum forming machine is started, and if the vent holes in the mold are blocked, whistling sound is given out; and S6, positioning maintenance: a worker checks and positions the blocked part for repairing. According to the invention, the anti-blocking alarm is arranged below the vent hole of the mold, so that whistling sound can be given out after the vent hole is blocked, workers can find and eliminate problems in time, and continuous production of defective products is avoided.

Description

Technical Field

[0001] The invention relates to the field of plastic product production, in particular to an anti-blocking treatment scheme for vent holes of a blister molding machine mold. Background Art

[0002] Vacuum forming is an important processing technology for plastic molding. The main principle is to heat and soften the flat plastic sheet material, then use vacuum to absorb it on the mold surface and cool it down to form it. When the mold on the vacuum forming machine is in use, if there is a groove on the mold surface or the area is large, the area around the groove will block the vacuum pump's suction force on the air in the groove after the vacuum forming, resulting in the groove area not being able to be formed according to the template style. Similarly, this situation is also prone to occur when the mold surface area is large. Therefore, it is necessary to make vents at key positions on the mold so that the molded product can achieve the ideal shape.

[0003] In actual use, the vents of the mold on the blister machine are usually not blocked, but due to the numerous production machines and workers' activities during workshop production, floating objects such as plastic debris and hair will inevitably be brought up, and the conveyed sheets are also prone to adsorb some small impurities due to static electricity, which will inevitably cause the vents on the mold to be blocked. These products will have problems such as imperfect molding and uneven thickness at the blocked parts, becoming defective products; if there are fewer blocked vents, the defective problems of these products are often difficult to detect with the naked eye of workers. Due to the low probability and frequency of vent blockage, the entire production line works continuously during blister production, so workers will not check the mold too frequently, resulting in the continued production of a large number of products after the vents are blocked, resulting in a large number of defective products. Summary of the invention

[0004] In view of the fact that the vent holes on the mold in the blister process mentioned in the background technology are often blocked and cannot be discovered for a long time, resulting in a large number of defective products being produced, the present invention installs an anti-blocking alarm under the mold vent holes, which will emit a whistle when the vent holes are blocked, so that workers can discover and eliminate the problem in time.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a solution for preventing the vent holes of a blister molding machine from being blocked, comprising the following steps:

[0006] S1. Disassemble the mold: remove the mold from the fixture on the mold table.

[0007] S2. Check the mold: Check whether the number of vent holes punched on the mold is an even number. If it is an odd number, punch another vent hole.

[0008] S3. Install anti-blocking alarms: Take a number of anti-blocking alarms, and insert the two pins of these anti-blocking alarms into the two vents of the mold from the bottom respectively.

[0009] S4. Reinstall the mold: Install the mold back to the fixture of the mold table, and make the anti-blocking alarm located between the mold and the mold table.

[0010] S5. Blockage alarm: Start the blister machine. Under the action of the vacuum pump, part of the air between the mold and the softened sheet passes through the anti-blockage alarm and enters under the mold platform. In this process, if the vents on the mold are not blocked, the airflows blown out from the two vent pipes on the anti-blockage alarm corresponding to the corresponding vents will interfere with each other, and the combined airflow formed after the interference will not make a whistle when it is blown onto the sound-generating sheet. However, if the vents on the mold are blocked, the airflow blown to the sound-generating sheet by the unblocked vent pipe on the anti-blockage alarm corresponding to the corresponding vent will vibrate and make a whistle, thus realizing the blockage alarm function. The whistle caused by the blockage will be emitted when the vacuum pump starts working and lasts for a long time. The two vents inserted by the two pins of a single anti-blockage alarm cannot fit the softened sheet at the same time and a whistle will be emitted. However, the whistle is not emitted when the vacuum pump starts working and lasts for a short time. Workers can judge whether the whistle is a blockage failure or a normal whistle based on this.

[0011] S6. Positioning and maintenance: The staff visually observes whether there is any obvious blockage on the vent holes of the mold. If no blockage is observed, an air pump is used to blow air from the top of each vent hole on the mold. If a whistle is heard, it proves that the vent hole is unobstructed, otherwise it means that the vent hole is blocked, thus completing the positioning of the blocked vent hole and the staff repairs the location.

[0012] The anti-blocking alarm used in steps S1-S6 includes a pin, a vent pipe, a sound tube and a sound plate; the interior of the sound tube is a hollow structure, with two circular holes on the top surface and a through bottom surface; the sound plate is arranged in the sound tube; one end of the vent pipe is connected to the pin, and the other end of the vent pipe is connected to the circular hole of the sound tube and faces the sound plate. There are two vent pipes, and the directions of the other ends of the two vent pipes intersect and the intersection is located between the vent pipe and the sound plate. The sounding principle of the anti-blocking alarm is the same as that of a whistle or a flute.

[0013] Preferably, when installing the anti-blocking alarm in step S3, the two ventilation holes into which the two pins of a single anti-blocking alarm are inserted are close in order to the softened sheet during the blister process, because the ventilation holes are also equivalent to blockage after being bonded to the sheet. If the two ventilation holes into which the two pins are inserted are bonded to the softened sheet in an order too far apart, a longer whistle sound will occur, increasing the difficulty for workers to make judgments.

[0014] Preferably, the ventilation pipe is made of high-temperature engineering plastic or metal bellows, which can withstand the heating temperature during the blister forming process.

[0015] Preferably, a base is connected to the bottom of the mold by screws, the interior of the base is a hollow structure and penetrates from top to bottom, the anti-blocking alarm is arranged in the hollow part of the base, and the clamp fixes the base to the mold platform. The function of the base is to provide a storage space for the anti-blocking alarm.

[0016] The beneficial effects of the present invention are:

[0017] (1) The present invention installs an anti-blocking alarm under the mold vent hole, which emits a whistle when the vent hole is blocked, so that workers can find and eliminate the problem in time to avoid continued production of defective products.

[0018] (2) The anti-blocking alarm used in the present invention has a very simple structure due to the alarm principle, and does not use electronic devices and moving mechanical parts. It has extremely high reliability and a very long service life, and is almost free of malfunction problems. In addition, it is low in cost, so it can be truly implemented and used.

[0019] (3) After the anti-blockage alarm of the present invention sounds a whistle alarm, the workers can conduct an investigation in a very simple manner. If the blockage cannot be directly located by visual inspection, they only need to use an air pump to blow air through each vent on the mold. If no whistle sounds, it proves that the vent is blocked. This operation can be successfully completed by inexperienced workers. It can be seen that the operation is simple and the difficulty is extremely low. Due to the simple operation, the investigation efficiency is also high, and the equipment can be put back into production as soon as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a flow chart of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the anti-blocking alarm used by the present invention. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1 , a blocking prevention solution for the vent hole of a blister molding machine mold of this embodiment includes the following steps:

[0024] S1. Disassemble the mold: remove the mold from the fixture on the mold table.

[0025] S2. Check the mold: Check whether the number of vent holes punched on the mold is an even number. If it is an odd number, punch another vent hole.

[0026] S3. Install anti-blocking alarms: Take a number of anti-blocking alarms, and insert the two pins of these anti-blocking alarms into the two vents of the mold from the bottom respectively.

[0027] S4. Reinstall the mold: Install the mold back to the fixture of the mold table, and make the anti-blocking alarm located between the mold and the mold table.

[0028] S5. Blockage alarm: Start the blister machine. Under the action of the vacuum pump, part of the air between the mold and the softened sheet passes through the anti-blockage alarm and enters under the mold platform. In this process, if the vents on the mold are not blocked, the airflows blown out from the two vent pipes on the anti-blockage alarm corresponding to the corresponding vents will interfere with each other, and the combined airflow formed after the interference will not make a whistle when it is blown onto the sound-generating sheet. However, if the vents on the mold are blocked, the airflow blown to the sound-generating sheet by the unblocked vent pipe on the anti-blockage alarm corresponding to the corresponding vent will vibrate and make a whistle, thus realizing the blockage alarm function. The whistle caused by the blockage will be emitted when the vacuum pump starts working and lasts for a long time. The two vents inserted by the two pins of a single anti-blockage alarm cannot fit the softened sheet at the same time and a whistle will be emitted. However, the whistle is not emitted when the vacuum pump starts working and lasts for a short time. Workers can judge whether the whistle is a blockage failure or a normal whistle based on this.

[0029] S6. Positioning and maintenance: The staff visually observes whether there is any obvious blockage on the vent holes of the mold. If no blockage is observed, an air pump is used to blow air from the top of each vent hole on the mold. If a whistle is heard, it proves that the vent hole is unobstructed, otherwise it means that the vent hole is blocked, thus completing the positioning of the blocked vent hole and the staff repairs the location.

[0030] like Figure 2 The anti-blocking alarm used in steps S1-S6 includes a pin 1, a vent pipe 2, a sound tube 3 and a sound plate 4; the sound tube 3 is a hollow structure with two circular holes on the top and a through bottom; the sound plate 4 is arranged in the sound tube 3; one end of the vent pipe 2 is connected to the pin 1, and the other end of the vent pipe 2 is connected to the circular hole of the sound tube 3 and faces the sound plate 4. There are two vent pipes 2, and the directions of the other ends of the two vent pipes 2 intersect and the intersection is located between the vent pipe 2 and the sound plate 4. The sounding principle of the anti-blocking alarm is the same as that of a whistle or a flute.

[0031] When installing the anti-blocking alarm in step S3, the two ventilation holes into which the two pins of a single anti-blocking alarm are inserted are close in order to the softened sheet during the blister process, because the ventilation holes are also blocked after being bonded to the sheet. If the two ventilation holes into which the two pins are inserted are too far apart in order to the softened sheet, a longer whistle sound will occur, increasing the difficulty for workers to make judgments.

[0032] The vent pipe is made of high-temperature engineering plastic or metal bellows, which can withstand the heating temperature during the blister forming process.

[0033] A base is connected to the bottom of the mold by screws. The base is a hollow structure and penetrates from top to bottom. The anti-blocking alarm is arranged in the hollow part of the base. The clamp fixes the base to the mold platform. The function of the base is to provide a storage space for the anti-blocking alarm.

[0034] It should be understood that the above are only preferred embodiments of the present invention, and the patent scope of the present invention cannot be limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A solution for preventing the vent holes of a blister molding machine from being blocked, characterized in that The following steps are involved: S1. Disassemble the mold: remove the mold from the fixture on the mold table; S2. Check the mold: Check whether the number of vent holes punched on the mold is an even number. If it is an odd number, punch another vent hole; S3. Install anti-blocking alarms: Take a number of anti-blocking alarms, and insert the two pins of these anti-blocking alarms into the two vent holes of the mold from the bottom respectively; S4. Reinstall the mold: install the mold back to the fixture of the mold table, and make the anti-blocking alarm located between the mold and the mold table; S5, blockage alarm: Start the blister machine, and under the action of the vacuum pump, part of the air between the mold and the softened sheet passes through the anti-blockage alarm and enters under the mold platform; in this process, if the vents on the mold are not blocked, the airflows blown out from the two vent pipes on the anti-blockage alarm corresponding to the corresponding vents will interfere with each other, and the combined airflow formed after the interference will not make a whistle when it blows onto the sounding sheet. However, if the vents on the mold are blocked, the airflow blown from the unblocked vent pipe on the anti-blockage alarm corresponding to the corresponding vent to the sounding sheet will vibrate and make a whistle, thus realizing the blockage alarm function; S6. Positioning and repair: The staff visually observes whether there is any obvious blockage on the vent holes of the mold. If no blockage is observed, the staff uses an air pump to blow air to each vent hole on the mold from above. If a whistle is heard, it proves that the vent hole is unobstructed. Otherwise, it means that the vent hole is blocked. The blocked vent hole is located and the staff repairs the location. The anti-blocking alarm used in steps S1-S6 comprises a plug pin (1), a vent pipe (2), a sound tube (3) and a sound plate (4); the sound tube (3) has a hollow structure inside, and its top surface is provided with two circular holes and the bottom surface is through-connected; the sound plate (4) is arranged in the sound tube (3); one end of the vent pipe (2) is connected to the plug pin (1), and the other end of the vent pipe (2) is connected to the circular hole of the sound tube (3) and faces the sound plate (4); there are two vent pipes (2), and the directions of the other ends of the two vent pipes (2) intersect and the intersection point is located between the vent pipe (2) and the sound plate (4).

2. The anti-blocking treatment solution for the vent hole of the blister molding machine according to claim 1 is characterized by: When the anti-blocking alarm is installed in step S3, the two vent holes into which the two pins of a single anti-blocking alarm are inserted are close in order to be attached to the softened sheet during the blister process.

3. The anti-blocking treatment solution for the vent hole of the blister molding machine according to claim 1 is characterized by: The material of the ventilation pipe is high-temperature engineering plastic or metal bellows.

4. The anti-blocking treatment solution for the vent hole of the blister molding machine according to claim 1 is characterized by: A base is connected to the lower part of the mold by screws. The interior of the base is a hollow structure and is connected from top to bottom. The anti-blocking alarm is arranged in the hollow part of the base. The clamp fixes the base to the mold platform.

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