Vacuum pumping method and vacuum pumping equipment for preventing overpressure of vacuum bag

Abstract

The invention discloses a vacuum-pumping method and vacuum-pumping equipment for preventing overpressure of a vacuum bag, and the vacuum-pumping method comprises the following steps: calculating the volume V < pumping > of air actually required to be pumped by the vacuum bag according to the volume V < bag > of the vacuum bag and the volume V < inner > of contents; under the preset high extraction speed, high-pressure fast extraction operation is conducted on the vacuum bag for preset time, and the volume of air needing to be extracted is V height; and at the preset low extraction speed, low-pressure slow extraction operation is conducted on the vacuum bag till the preset pressure is achieved, the volume of air needing to be extracted is V low, and V low meets the formula V low = V extraction-V high. Therefore, the timeliness of a vacuumizing post is guaranteed, the pressure in the sealed packaging bag can be accurately controlled, and the deformation of the plastic uptake disc in the anti-static vacuum bag and the extrusion deformation of the display module caused by excessive vacuum are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of display module production, and in particular to a vacuuming method and vacuuming equipment for preventing a vacuum bag from being over-pressurized. Background Art

[0002] In many fields such as industrial production, packaging, storage and transportation, vacuum bags are widely used as an important packaging material to protect and fix various items. For example, when the mobile phone display module is completed and packaged, each display module needs to be placed in a blister tray. Specifically, the blister trays are stacked to a certain number of layers and then placed in an anti-static bag. In order to prevent the blister tray from shaking and causing the display module to shift and be squeezed, vacuum equipment is usually used to evacuate the anti-static bag so that there is no space for the blister tray to shake, thereby fixing the blister tray.

[0003] However, when packaging is done manually, the vacuum degree in each anti-static vacuum bag may vary due to factors such as the sealing position of the anti-static vacuum bag and the vacuuming time of the vacuum machine. When the vacuum is over-extracted, the blister tray may be deformed under pressure. Please refer to Figure 3 and Figure 4 As shown, the display module in the blister tray will be squeezed, and after the display module is squeezed, defects such as blue spots will appear. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a vacuum pumping method and a vacuum pumping device for preventing overpressure of a vacuum bag, thereby preventing a display module in a blister tray from being squeezed and causing poor display.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A vacuuming method for preventing a vacuum bag from being over-pressurized, comprising:

[0007] According to the volume V of the vacuum bag 袋 and the volume of the contents V 内 , calculate the volume V of air that the vacuum bag actually needs to extract 抽 ;

[0008] At a preset high extraction speed, the vacuum bag is subjected to high pressure rapid extraction operation for a preset time, and the volume of air to be extracted is V 高 , where V 高 Less than V 抽 ;

[0009] At a preset low extraction speed, the vacuum bag is slowly pumped at low pressure to a preset pressure, and the volume of air to be extracted is V 低 , where V低 Satisfy formula V 低 =V 抽 -V 高 .

[0010] In one embodiment, at the preset high extraction speed, the vacuum bag is subjected to high pressure rapid extraction operation for a preset time, and the volume of air to be extracted is V 高 , where V 高 Less than V 抽 Specifically, it includes:

[0011] Using a high vacuum pumping module to perform high-pressure fast pumping operation on the vacuum bag;

[0012] The high-pressure quick-pumping timing operation is performed by the timing switch module to control the vacuum bag to perform the high-pressure quick-pumping operation to a preset time;

[0013] The high vacuum pumping module is closed through the timing switch module to stop the high-pressure fast pumping operation of the high vacuum pumping module.

[0014] In one embodiment, at the preset low extraction speed, the vacuum bag is slowly pumped at low pressure to a preset pressure, and the volume of air to be extracted is V 低 , where V 低 Satisfy formula V 低 =V 抽 -V 高 Specifically, it includes:

[0015] Use a low vacuum pumping module to perform a low-pressure slow pumping operation on the vacuum bag;

[0016] When the pressure in the vacuum bag reaches a preset pressure, the low vacuum pumping module is turned off by the switch module to stop the low-pressure slow pumping operation of the low vacuum pumping module.

[0017] A vacuum pumping device, which is used in the above vacuum pumping method, comprises:

[0018] A high vacuum pumping component, the high vacuum pumping component includes a high vacuum pumping module and a timing switch module, the timing switch module is connected to the high vacuum pumping module, the high vacuum pumping module is used to perform high pressure fast pumping operation on the vacuum bag, and the timing switch module is used to control the high pressure fast pumping time of the high vacuum pumping module and start and stop the high vacuum pumping module;

[0019] A low vacuum pumping component, the low vacuum pumping component includes a low vacuum pumping module and a switch module, the low vacuum pumping module is used to perform low-pressure slow pumping operation on the vacuum bag, and the switch module is used to control the start and stop of the low vacuum pumping module.

[0020] In one embodiment, the high vacuum pumping module is a first pressure reducing valve.

[0021] In one embodiment, the timing switch module includes a first relay and a first solenoid valve, the first solenoid valve is connected to the first pressure reducing valve, the first relay is connected to the first solenoid valve, the first relay is used to control the high-pressure fast pumping time of the high-vacuum pumping module, and the first solenoid valve is used to start and stop the high-vacuum pumping module.

[0022] In one embodiment, the low vacuum pumping module is a second pressure reducing valve.

[0023] In one embodiment, the switch module includes a second solenoid valve and a second relay, the second solenoid valve is connected to the second pressure reducing valve, the second solenoid valve is connected to the second relay, the second relay is used to control the start and stop of the second solenoid valve, and the second solenoid valve is used to control the start and stop of the second pressure reducing valve.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] The vacuuming method for preventing the vacuum bag from being over-pressurized of the present invention divides the vacuuming process into high-pressure fast pumping and low-pressure slow pumping. The purpose of performing high-pressure fast pumping first is to increase the speed of vacuuming and thus improve the air extraction efficiency. After the high-pressure fast pumping is completed, it is converted to low-pressure slow pumping to prevent excessive extraction from causing the blister plate to be misaligned, squeezed and ruptured, and the display module to be squeezed and thus cause defects. In this way, the timeliness of the vacuuming post is guaranteed, and the pressure in the packaging bag after sealing can be accurately controlled to avoid overpressure, thereby preventing excessive vacuum from causing the blister plate inside the anti-static vacuum bag to be deformed and the display module to be squeezed and deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 Schematic diagram of a process of a vacuum pumping method for preventing over-pressure of a vacuum bag in one embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of placing a display module in a blister tray;

[0029] Figure 3 This is a schematic diagram of the blister trays without deformation after stacking;

[0030] Figure 4 It is a schematic diagram of the compression deformation of the blister trays after stacking;

[0031] Figure 5It is a schematic structural diagram of a vacuum pumping device for preventing over-pressure of a vacuum bag in one embodiment of the present invention; DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings.

[0033] See also Figure 1-Figure 4 As shown, a vacuuming method for preventing the vacuum bag 11 from being over-pressurized comprises:

[0034] S100: According to the volume V of the vacuum bag 11 袋 and the volume of the contents V 内 , calculate the volume V of air that the vacuum bag 11 actually needs to extract 抽 ;

[0035] S200: At a preset high extraction speed, the vacuum bag 11 is subjected to a high pressure rapid extraction operation for a preset time, and the volume of air to be extracted is V 高 , where V 高 Less than V 抽 ;

[0036] S300: At a preset low extraction speed, the vacuum bag 11 is slowly extracted at low pressure to a preset pressure, and the volume of air to be extracted is V 低 , where V 低 Satisfy formula V 低 =V 抽 -V 高 .

[0037] It should be noted that the traditional vacuuming method is usually to use a single vacuum source for vacuuming, that is, a high-pressure quick pumping method is usually used to complete the vacuuming operation of the anti-static vacuum bag 11. At the same time, the vacuuming time for each time is fixed, so the volume of the vacuumed gas is also fixed. This will cause the vacuuming method with a single vacuum source to be easily affected by the difference in the initial gas volume of the vacuum bag 11. For example, the operator's manual sealing position is different, and the degree of expansion of the vacuum bag 11 before sealing is different, which will cause different pressures in the vacuum bag 11 after vacuum sealing. If the initial gas volume is small, over-vacuuming will occur, which is equivalent to the vacuuming equipment pumping for a longer period of time, resulting in the extrusion of the blister tray 13 in the vacuum bag 11. Please refer to Figure 2 , Figure 3 and Figure 4 As shown, Figure 3 The blister trays 13 are stacked and not squeezed. Figure 4The blister trays 13 are stacked and squeezed. After the blister trays 13 are squeezed, the display module 12 in the blister trays 13 will also be squeezed, which will cause the display module 12 to have blue spots and other defects. Therefore, in the present invention, the traditional single vacuum source vacuuming method is changed to a double vacuum source vacuuming method. Specifically, the volume V of the air that the vacuum bag 11 actually needs to extract is first calculated. 抽 , that is, by increasing the volume V of the vacuum bag 11 袋 Subtract the volume of the contents V 内 , get the volume V of air that actually needs to be extracted from the vacuum bag 11 抽 Then, the vacuum bag 11 is subjected to high-pressure quick pumping operation. The purpose of high-pressure quick pumping is to improve the pumping efficiency. At this time, the vacuum bag 11 is ensured to be pumped quickly at high pressure for a preset time. The preset time here can be experimentally confirmed according to the actual size of the vacuum bag 11 to ensure that it will not be over-pumped during this period. That is, it is necessary to ensure that the volume V of air extracted by the high-pressure quick pumping within the preset time is 高 Smaller than the volume V of air that the vacuum bag 11 actually needs to extract 抽 After the high-pressure fast pumping operation is completed, the low-pressure slow pumping operation is switched, that is, the vacuum bag 11 is subjected to a low-pressure slow pumping operation to a preset pressure at a preset low-pressure pumping speed. At this time, the variable to be controlled is the gas pressure in the vacuum bag 11. When the gas pressure in the vacuum bag 11 reaches the preset pressure, the low-pressure slow pumping operation of the vacuum bag 11 is stopped. Since the pressure of the vacuum bag 11 is controlled during the low-pressure slow pumping operation, the volume V of the air extracted during the low-pressure slow pumping operation can be ensured. 低 Satisfy formula V 低 =V 抽 -V 高 At the same time, a slow extraction method is adopted to avoid excessive vacuum from causing extrusion damage to the internal blister disk 13 and the display module 12.

[0038] In one embodiment, in step S200: at a preset high extraction speed, the vacuum bag 11 is subjected to a high pressure rapid extraction operation for a preset time, and the volume of air to be extracted is V 高 , where V 高 Less than V 抽 Specifically, it includes:

[0039] S210: Use a high vacuum pumping module to perform high-pressure fast pumping operation on the vacuum bag 11;

[0040] S220: Performing a high-pressure quick-pumping timing operation through the timing switch module to control the vacuum bag 11 to perform a high-pressure quick-pumping operation to a preset time;

[0041] S230: The high vacuum pumping module is turned off through the timing switch module to stop the high pressure fast pumping operation of the high vacuum pumping module. That is, the high pressure fast pumping time is controlled to a preset time through the timing switch module, and then the high vacuum pumping module is turned off through the timing switch module to realize the automatic pumping stop operation. During the preset time period, it is necessary to ensure that V 高 Less than V 抽 to avoid over-vacuum.

[0042] In one embodiment, in step S300: at a preset low extraction speed, the vacuum bag 11 is slowly pumped at low pressure to a preset pressure, and the volume of air to be extracted is V 低 , where V 低 Satisfy formula V 低 =V 抽 -V 高 Specifically, it includes:

[0043] S310: Use a low vacuum pumping module to perform a low-pressure slow pumping operation on the vacuum bag 11;

[0044] S320: When the pressure in the vacuum bag 11 reaches the preset pressure, the low vacuum pumping module is closed through the switch module to stop the low-pressure slow pumping operation of the low vacuum pumping module. The preset pressure can be set on the low vacuum pumping module, that is, when the pressure in the vacuum bag 11 reaches the preset pressure of the low vacuum pumping module, the low vacuum pumping module will be immediately closed through the switch module, and the low vacuum pumping module adopts the low-pressure slow pumping operation, so it can avoid instantaneous over-pumping to cause excessive vacuum of the vacuum bag 11.

[0045] Taking the commonly used vacuum bag size of 500mm*350mm*200mm in the field of mobile phone display module production as an example, the volume V of the vacuum bag 11 is 袋 35000cm 3 , wherein the content V of the vacuum bag 11 内 , (blister tray 13 and display module 12) occupied volume: 400mm*250mm*150mm, that is, the content V 内 The volume occupied is 15000cm 3 , calculate the actual volume V of air that needs to be extracted from the vacuum bag 11 抽 20000cm 3 ; At the preset high extraction speed, for example, the extraction speed is 6000cm 3 / s, the preset time required for the corresponding high-pressure quick extraction operation is 3S, and the volume of air extracted at this time is V 高 24000cm 3 The high-voltage extraction speed and the preset extraction time here can be matched and selected according to the actual time, as long as V 高Less than V 抽 ; Then switch to low pressure slow pumping operation, that is, at a preset low pumping speed, for example, a low pumping speed of 500cm 3 / s, when the pressure of the vacuum bag 11 reaches the preset pressure, for example, the preset pressure is -30Kpa, the corresponding low-pressure slow pumping time is 4s, that is, the volume of air that needs to be extracted under the low-pressure slow pumping operation is V 低 2000cm 3 , at this time, V 低 Satisfy formula V 低 =V 抽 -V 高 In this way, it is possible to prevent the blister plate 13 from being displaced, squeezed and broken due to excessive extraction, and to prevent the display module 12 from being squeezed and causing blue ball defects.

[0046] See also Figure 5 As shown, a vacuum pumping device 10 is used in the above vacuum pumping method, comprising:

[0047] A high vacuum pumping assembly 100, the high vacuum pumping assembly 100 comprises a high vacuum pumping module 110 and a timing switch module 120, the timing switch module 120 is connected to the high vacuum pumping module 110, the high vacuum pumping module 110 is used to perform a high pressure fast pumping operation on the vacuum bag 11, and the timing switch module 120 is used to control the high pressure fast pumping time of the high vacuum pumping module 110 and start and stop the high vacuum pumping module 110;

[0048] The low vacuum pumping component 200 includes a low vacuum pumping module 210 and a switch module 220 . The low vacuum pumping module 210 is used to perform a low-pressure slow pumping operation on the vacuum bag 11 , and the switch module 220 is used to control the start and stop of the low vacuum pumping module 210 .

[0049] It should be noted that when the vacuum bag 11 is evacuated, the high vacuum pumping module 110 is first used to perform high pressure fast pumping to the preset time, and the timing switch module 120 is used to perform timing operation. When the preset time is reached, the timing switch module 120 controls the high vacuum pumping module 110 to stop the pumping operation, so as to complete the high pressure fast pumping operation and improve the extraction efficiency. Then the low pressure slow pumping operation is switched, and the vacuum bag 11 is evacuated specifically by the low vacuum pumping module 210. When the pressure in the vacuum bag 11 reaches the preset pressure of the low vacuum pumping module 210, the low vacuum pumping module 210 is closed by the switch module 220, thereby completing the low pressure slow pumping operation of the vacuum bag 11, thereby preventing the blister tray 13 from being dislocated, squeezed and broken due to excessive extraction, and preventing the display module from being squeezed and causing poor display.

[0050] In one embodiment, preferably, the high vacuum pumping module 110 is a first pressure reducing valve. The vacuum bag 11 is subjected to a high pressure fast pumping operation through the first pressure reducing valve. In this embodiment, the timing switch module 120 includes a first relay 111 and a first solenoid valve 112, the first solenoid valve 112 is connected to the first pressure reducing valve, the first relay 111 is connected to the first solenoid valve 112, the first relay 111 is used to control the high pressure fast pumping time of the high vacuum pumping module 110, and the first solenoid valve 112 is used to start and stop the high vacuum pumping module 110. Among them, the first relay 111 plays a role in calculating time and acts as a switch of the first solenoid valve 112. When the first solenoid valve 112 is in an open state, the gas in the vacuum bag 11 can be pumped out by the first pressure reducing valve. When the preset time of the first relay 111 is reached, the first solenoid valve 112 is closed by the first relay 111, so that the gas in the vacuum bag 11 can no longer be pumped out by the first pressure reducing valve, so as to realize the operation of closing the first pressure reducing valve.

[0051] In one embodiment, the low vacuum pumping module 210 is a second pressure reducing valve. The vacuum bag 11 is slowly pumped at low pressure through the first pressure reducing valve. In this embodiment, the switch module 220 includes a second solenoid valve 221 and a second relay 222. The second solenoid valve 221 is connected to the second pressure reducing valve, and the second solenoid valve 221 is connected to the second relay 222. The second relay 222 is used to control the start and stop of the second solenoid valve 221, and the second solenoid valve 221 is used to control the start and stop of the second pressure reducing valve. When the second solenoid valve 221 is in the open state, the second pressure reducing valve extracts the air in the vacuum bag 11. When the pressure value in the vacuum bag 11 reaches the preset pressure value, the second solenoid valve 221 is used to close the second pressure reducing valve, and the second relay 222 serves as the switch of the second solenoid valve 221 to control the start and stop of the second solenoid valve 221. That is, when the second relay 222 closes the second solenoid valve 221, air cannot pass through the second solenoid valve 221, thereby causing the second pressure reducing valve to end the extraction operation.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A vacuuming method for preventing overpressure of a vacuum bag, characterized in that: include: According to the volume V of the vacuum bag 袋 and the volume of the contents V 内 , calculate the volume V of air that the vacuum bag actually needs to extract 抽 ; At a preset high extraction speed, the vacuum bag is subjected to high pressure rapid extraction operation for a preset time, and the volume of air to be extracted is V 高 , where V 高 Less than V 抽 ; At a preset low extraction speed, the vacuum bag is slowly pumped at low pressure to a preset pressure, and the volume of air to be extracted is V 低 , where V 低 Satisfy formula V 低 =V 抽 -V 高 .

2. The vacuuming method for preventing overpressure of a vacuum bag according to claim 1, characterized in that: At the preset high extraction speed, the vacuum bag is subjected to high pressure rapid extraction operation for a preset time, and the volume of air to be extracted is V 高 , where V 高 Less than V 抽 Specifically, it includes: Using a high vacuum pumping module to perform high-pressure rapid pumping operation on the vacuum bag; The high-pressure quick-pumping timing operation is performed by the timing switch module to control the vacuum bag to perform the high-pressure quick-pumping operation to a preset time; The high vacuum pumping module is closed through the timing switch module to stop the high-pressure fast pumping operation of the high vacuum pumping module.

3. The vacuuming method for preventing overpressure of a vacuum bag according to claim 1, characterized in that: At the preset low extraction speed, the vacuum bag is slowly pumped at low pressure to a preset pressure, and the volume of air to be extracted is V 低 , where V 低 Satisfy formula V 低 =V 抽 -V 高 Specifically, it includes: Use a low vacuum pumping module to perform a low-pressure slow pumping operation on the vacuum bag; When the pressure in the vacuum bag reaches a preset pressure, the low vacuum pumping module is turned off by the switch module to stop the low-pressure slow pumping operation of the low vacuum pumping module.

4. A vacuum pumping device, characterized in that: The vacuuming device is applied to the vacuuming method according to any one of claims 1 to 3, comprising: A high vacuum pumping component, the high vacuum pumping component includes a high vacuum pumping module and a timing switch module, the timing switch module is connected to the high vacuum pumping module, the high vacuum pumping module is used to perform high pressure fast pumping operation on the vacuum bag, and the timing switch module is used to control the high pressure fast pumping time of the high vacuum pumping module and start and stop the high vacuum pumping module; A low vacuum pumping component, the low vacuum pumping component includes a low vacuum pumping module and a switch module, the low vacuum pumping module is used to perform low-pressure slow pumping operation on the vacuum bag, and the switch module is used to control the start and stop of the low vacuum pumping module.

5. The vacuum pumping device according to claim 4, characterized in that: The high vacuum pumping module is a first pressure reducing valve.

6. The vacuum pumping device according to claim 5, characterized in that: The timing switch module includes a first relay and a first solenoid valve, the first solenoid valve is connected to the first pressure reducing valve, the first relay is connected to the first solenoid valve, the first relay is used to control the high-pressure fast pumping time of the high-vacuum pumping module, and the first solenoid valve is used to start and stop the high-vacuum pumping module.

7. The vacuum pumping device according to claim 4, characterized in that: The low vacuum pumping module is a second pressure reducing valve.

8. The vacuum pumping device according to claim 7, characterized in that: The switch module includes a second solenoid valve and a second relay, the second solenoid valve is connected to the second pressure reducing valve, the second solenoid valve is connected to the second relay, the second relay is used to control the start and stop of the second solenoid valve, and the second solenoid valve is used to control the start and stop of the second pressure reducing valve.

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