Electronic component storage cabinet and storage and management method

Abstract

An electronic component storage cabinet and storage and management method are designed, including: a plurality of storage spaces, each of which is provided with a plurality of placement slots for placing electronic components; a nitrogen inlet for inputting nitrogen, the nitrogen inlet being connected to a solenoid valve; a main controller connected to a humidity sensor to receive temperature and humidity data within the storage space; and a main controller connected to the solenoid valve to send an on / off command to the solenoid valve. A first tag is provided on the surface of the placement slot, emitting a first tag signal. A shielding layer is provided above the first tag. The shielding layer is away from the first tag when no external pressure is applied, but is brought into contact with the first tag when external pressure is applied, shielding the first tag signal. A card reader is connected to the main controller and transmits the read first tag information and an indication of whether the first tag signal has been read to the main controller. The provision of electronic tags enables identification and recording of products within the storage space.

Description

Technical Field

[0001] The present invention relates to storage technology for electronic components, and in particular to an electronic component storage cabinet and a storage and management method. Background Art

[0002] A nitrogen cabinet is a storage device used to store items with certain humidity requirements. Examples include common nitrogen cabinets for document storage and semiconductor device storage.

[0003] For dehumidification cabinets or nitrogen cabinets for electronic components that require high humidity control accuracy, the management process is complicated, and errors in the management of the exposure time of unpacked electronic components often occur, resulting in an increase in the scrap rate in the production workshop. Summary of the Invention

[0004] (1) In order to solve at least one shortcoming of the prior art, the present invention provides an electronic component storage cabinet.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] An electronic component storage cabinet includes the following structure:

[0007] A plurality of storage spaces, each of which is provided with a plurality of placement slots for placing electronic components;

[0008] The cabinet door, the inner wall of the cabinet door or the outer edge of the storage space are provided with a sealing strip;

[0009] Nitrogen input port, used to input nitrogen, the nitrogen input port is connected to the solenoid valve;

[0010] A flow meter is connected to the nitrogen inlet to control the nitrogen input flow rate;

[0011] a barometer connected to the storage space and used to detect the air pressure in the storage space;

[0012] Humidity sensor, used to detect humidity data in the storage space;

[0013] The main controller is connected to the humidity sensor to receive the humidity data in the storage space; it is connected to the solenoid valve to send an open / close command to the solenoid valve;

[0014] A first tag is disposed on the surface of the placement slot, and the first tag transmits a first tag signal. A shielding layer is disposed above the first tag. The shielding layer is away from the first tag when no external pressure is applied, and is close to the first tag when external pressure is applied, thereby shielding the first tag signal.

[0015] The card reader is connected to the main controller and sends the read first tag information and a signal flag indicating whether the first tag is read to the main controller.

[0016] The card reader is further used to identify a second tag carried by an object placed on the placement slot, and the second tag transmits a second tag signal;

[0017] The second tag is a tear-off tag, which is arranged at the unsealing opening of the article packaging bag. After unsealing, the tear-off tag is torn, and the card reader cannot read the second tag signal.

[0018] Preferably, the first label information includes: a storage space number, a placement slot number, and an electronic component type number.

[0019] Preferably, there are several humidity sensors, and one humidity sensor is set in each storage space;

[0020] The main controller receives data from all humidity sensors and comprehensively analyzes the overall humidity data of the storage cabinet;

[0021] Based on the overall humidity data of the storage cabinet, an open / close command is sent to the solenoid valve connected to the nitrogen inlet.

[0022] The beneficial effect of the present invention is to solve the problem of high cost of nitrogen cabinets with independent drawer precision control.

[0023] (II) Further providing a method for storing and managing electronic components, in order to solve the problem of improper management of the exposure time of electronic component products, the above-mentioned electronic component storage cabinet is adopted, including the storage and management method of bagged electronic components,

[0024] Open one cabinet door at a time to place or remove electronic components according to the storage labels configured on the cabinet doors;

[0025] At the same position, in response to the device placement state changing from presence to absence, the timing unit of the main controller is triggered to obtain a timestamp A;

[0026] The same position, in response to the device placement state from nothing to something:

[0027] If the second tag signal is recognized, the timing is stopped and the cache is cleared;

[0028] If the second tag signal is not recognized, determine whether the currently received humidity data meets the requirements. 1) If it meets the requirements, obtain the first time data based on the time length from timestamp A to the current time, calculate the second time data based on the first time data, and start timing to obtain timestamp B. Based on the second time data and timestamp B, calculate the time data for allowing the cabinet door to be opened;

[0029] 2) If not, fill the storage cabinet with nitrogen until the humidity data meets the requirements, then calculate the time data allowed to open the cabinet door according to step 1).

[0030] Preferably, the first time data is the first exposure time of the electronic components, and the first time data is greater than the second exposure time of the electronic components exposed to the environment not meeting the humidity value;

[0031] The second time data is n times of the first exposure time, and the value of n is calculated according to the requirement of electronic components to be dried in the nitrogen cabinet in the environment meeting the humidity value to restore the workshop life.

[0032] Preferably, the method for judging whether the current received humidity data meets the requirements comprises:

[0033] Calculating the average value and the maximum value of the humidity values output by all sensors in the nitrogen cabinet, and if the average value and the maximum value are both less than the preset humidity value, it meets the requirements;

[0034] Or, comparing whether the humidity value output by the sensor in the storage space of the electronic components to be returned is less than the preset humidity value, and if it is less than the preset humidity value, it meets the requirements.

[0035] Preferably, when the electronic components are taken away, the timing unit counts the time to the first preset time, clears the timing data and marks the number of the electronic components taken away.

[0036] The beneficial effects of the present application realize accurate recording of the exposure time of the disassembled electronic component products, and accurate exposure time control is performed, thereby reducing the scrap rate of the SMT workshop production products. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0038] Figure 1 is a structural schematic diagram of an electronic component storage cabinet;

[0039] Figure 2 is a flowchart of an electronic component storage and management method. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below in combination with the embodiments. The following embodiments are an explanation of the present application and the present application is not limited to the following embodiments.

[0041] Embodiment 1

[0042] The application discloses an electronic component storage cabinet, in particular to a cabinet for storing moisture-sensitive components. Figure 1 The cabinet comprises the following structures:

[0043] A plurality of storage spaces, each of which is provided with a plurality of placing slots for placing electronic components;

[0044] A cabinet door, each storage space is provided with an independent cabinet door, and a sealing strip is arranged on the inner wall of the cabinet door or the outer side edge of the storage space;

[0045] A nitrogen inlet for inputting nitrogen, which is connected with an electromagnetic valve;

[0046] A flow meter connected with the nitrogen inlet for controlling the flow of the input nitrogen;

[0047] A barometer connected to the storage space for detecting the air pressure in the storage space;

[0048] A humidity sensor for detecting the humidity data in the storage space;

[0049] A main controller connected with the humidity sensor and receiving the humidity data in the storage space, and connected with the electromagnetic valve and sending on / off instructions to the electromagnetic valve;

[0050] The surface of the placing slot is provided with a first label, the first label emits a first label signal, a shielding layer is arranged above the first label, the shielding layer is away from the first label in the state without external pressure, and close to the first label in the state with external pressure, and the first label signal is shielded;

[0051] A card reader connected with the main controller and sending the first label information and a flag indicating whether the first label signal is read to the main controller.

[0052] The card reader is further used for identifying a second label carried by an article placed in the placing slot, and the second label emits a second label signal.

[0053] The second label is a tearable label arranged at a sealing opening of a packaging bag of the article, and after the sealing opening is opened, the tearable label is torn and destroyed, so that the card reader cannot read the second label signal.

[0054] The first label information comprises a storage space number, a placing slot number and an electronic component type number.

[0055] In the above, the "label signal" is understood as a signal receivable by the card reader, and the "label information" is data carried by the label signal, such as the storage space number, the placing slot number and the electronic component type number.

[0056] For the moisture sensitive components after unpacking, into the workshop assembly, exposed to humidity control and not accurate assembly workshop, the exposure time control of moisture sensitive components is particularly important. For the components that are not used in the workshop, in order to facilitate unified management, they are usually placed back in the storage cabinet where they were taken from, as disclosed in example 1, the cabinet door is provided with a label, which is classified for easy management.

[0057] As a preferred, a display screen can also be configured on each cabinet door to display access information; this solution has relatively high cost, but the control is more precise. It is currently recommended to configure a general display screen to record and display access information.

[0058] Example 2:

[0059] However, there may be unpacked and unopened products in the same storage cabinet. How to manage the exposure time of unpacked products becomes a problem.

[0060] First, the unpacked packaging bag is provided with a tearable electronic tag. When the packaging bag is unpacked, the electronic tag is torn off; such electronic tags are commonly used for theft prevention. In this application, the electronic tag is combined with the data collection of the stored goods to realize the exposure time management of the moisture sensitive components after opening the bag.

[0061] The unpacked moisture sensitive components usually need to be dried before being placed back in the storage cabinet to maintain the continuous storage time, but the baking technology is relatively complex. The baking temperature may cause pin oxidation or cause excessive intermetallic growth, thereby reducing the solderability of the pins.

[0062] Therefore, based on the normal temperature drying method, for SMD with moisture sensitive level of 2-4 after unpacking the moisture-proof package, such as being exposed to an environment less than or equal to 30℃ / 60% RH, it is placed in a normal temperature drying box with a humidity of 10% RH, and the moisture removal storage time is more than 5 times the exposure time. The original workshop life can be restored.

[0063] For SMD with moisture sensitive level of 5-5a after unpacking the moisture-proof package, such as being exposed to an environment less than or equal to 30℃ / 60% RH, it is placed in a normal temperature drying box with a humidity of 10% RH, and the moisture removal storage time is more than 10 times the exposure time. The original workshop life can be restored.

[0064] The above requirements come from IPC-M-109 and the protection document of moisture sensitive components in the electronic industry. Based on the instructions in the document, this application combines the nitrogen cabinet and the tearable electronic tag disclosed in example 1. An electronic component storage and management method is disclosed, as shown in Figure 2 The method comprises the following steps:

[0065] According to the storage label configured on the cabinet door, the electronic components are placed or taken out.

[0066] In response to the device placement state from yes to no, the timing unit of the master controller is triggered to time, obtaining a timestamp A;

[0067] In response to the device placement state from no to yes in the same placement slot:

[0068] If the second label signal is identified and the current placement slot has the timestamp A, the timing is stopped, the cache is cleared, and the current second label information is recorded;

[0069] If the second label signal is not identified and the current placement slot has the timestamp A, it is determined whether the received humidity data meets the requirements, 1) if the requirements are met, the first time data is obtained according to the length from the timestamp A to the current time, the second time data is calculated according to the first time data, and the timing is started to obtain a timestamp B, and the time data for allowing the cabinet door to be opened is calculated according to the second time data and the timestamp B;

[0070] 2) if the requirements are not met, the storage cabinet is filled with nitrogen until the humidity data meets the requirements, and the time data for allowing the cabinet door to be opened is calculated according to step 1) after the humidity data meets the requirements.

[0071] This is the software running logic of taking out the unopened product first and then putting back the product that has been opened, and if the product that has been opened is taken out

[0072] The first time data is the first exposure time of the electronic component, and the first time data is greater than the second exposure time of the electronic component exposed to an environment not meeting the humidity value;

[0073] The second time data is n times of the first exposure time, and the value of n is calculated according to the requirement of drying the electronic component in the nitrogen cabinet in the environment meeting the humidity value to restore the workshop life.

[0074] The empty state of the placement slot is that the card reader can read the first label signal of the corresponding number according to the heartbeat;

[0075] The full state of the placement slot is that the card reader cannot read the first label signal of the corresponding number within a preset time;

[0076] In response to the unopened product being taken out, the card reader receives the original covered first label signal, and the card reader cannot receive the second label signal; this state is the device placement state from yes to no.

[0077] In response to the unopened product being put in, the state of the card reader for receiving the first label signal is from yes to no, that is, shielded; the state of the card reader for receiving the second label signal is from no to yes; this state is the device placement state from no to yes.

[0078] The unpacked product is put in, the card reader for receiving the first tag signal state is from yes to no, that is, shielding; At the same time, the card reader does not receive the second tag signal.

[0079] The unpacked product is taken out, the card reader for receiving the first tag signal state is from no to yes; At the same time, the card reader does not receive the second tag signal. As shown in Table 1:

[0080] Table 1

[0081]

[0082]

[0083] The first tag signal identifies whether there is an article in the placement slot, the second tag signal identifies whether the placed product is unpacked, and the product number and other information.

[0084] It also includes a management display module, which records the current stored articles or the last taken articles in the corresponding storage space. If a placement slot in the current storage space is empty, the display slot number is displayed as empty, and the time of the last taken article and the product number (electronic component type number) of the last taken article are also displayed.

[0085] The display method of the management display module is as follows:

[0086] For example, taking product with number XP00001 as an example, taking a three-layer nitrogen cabinet as an example, two storage spaces per layer, two subspaces per storage space, and a nitrogen cabinet with one placement slot per subspace as an example; Placement slot numbers: UL01, UL02; UR01, UR02; ML01, ML02; MR01, MR02; BL01, BL02; BR01, BR02;

[0087] The nitrogen cabinet surface is configured with a display screen. As a preferred, the host records the data and displays the last access activity time of the corresponding placement slot, for example, "UL01: XP00001: 2023.06.13.12.00: empty"; It means that UL01 storage box stores XP00001 number product, and the placement slot is empty after 2023.06.13.12.00 operation.

[0088] "UL01: XP00001: 2023.06.13.16.00: full" means that UL01 storage box has XP00001 number product after 2023.06.13.16.00 operation.

[0089] For unpacked products, the nitrogen cabinet cannot directly identify the product number (such as electronic component type number), and the staff needs to find the original placement position and re-enter the product number when placing.

[0090] As a preferred solution, in response to the externally input product number, the data record of the last time the product is taken out is called to find the corresponding storage space.

[0091] As long as the product number after unpacking is recorded in the current nitrogen cabinet management system, the processor can call the corresponding product taking-out event, and according to the taking-out time and the current placing time, it is calculated whether it exceeds the standard required exposure time. If it exceeds the standard required exposure time, an alarm information is issued. As a preferred solution, in order to save the processing burden of the processor, when the electronic component is taken away, the timing unit timing time reaches the first preset time, the timing data is cleared and the electronic component number taken away is marked. The first preset time is greater than the maximum exposure time of the electronic component.

[0092] If the standard required exposure time is not exceeded, the placing is allowed and the timing unit is called to get the timestamp A. When the placing time exceeds the exposure time by 5 times, the timing is stopped and the time data is stored. The first time data is the storage time of the unpacked product in the appropriate humidity environment when it is placed in the storage cabinet again; the second time data is the data obtained by multiplying the exposure time by n times; for example, a product is placed at 9:00, and the last time it is taken out is 6:00. The exposure time does not exceed 3h, and the second time data is calculated as 3h*5 times, and the timestamp A is xx year 03 month 01 day 9:00; the timestamp B is xx year 03 month 02 day 00:00. The time data allowed to open the cabinet door is after xx year 03 month 02 day 00:00.

[0093] Before the timing is completed, the current storage space is not allowed to be opened, and can be marked in red on the corresponding position of the display screen.

[0094] When the staff makes a mistake and stores unpacked products that do not belong to the nitrogen cabinet, the processor does not match the corresponding product taking-out event when the staff inputs the product number, and an alarm information is displayed.

[0095] At the same time according to the above management logic, the sensor monitoring system is not affected, and the nitrogen is introduced according to the original logic to control the humidity inside the nitrogen cabinet to be lower than 10% RH (or other preset value); according to the storage requirements of different products, the corresponding humidity monitoring data and response requirements are adjusted.

[0096] As a preferred solution, the humidity sensor has several, and one humidity sensor is arranged in each storage space;

[0097] The master controller receives data of all humidity sensors, and comprehensively analyzes the overall humidity data of the storage cabinet;

[0098] According to the overall humidity data of the storage cabinet, an open / close instruction is sent to the electromagnetic valve connected to the nitrogen input port.

[0099] A preferred control logic is proposed, which includes setting the humidity data signal acquisition frequency, receiving humidity data according to the frequency, calculating the average value and the maximum value of the humidity values output by all sensors in the nitrogen cabinet, and if the average value and the maximum value are both less than the preset humidity value, it meets the requirements.

[0100] Or, compare the humidity value output by the sensor in the storage space where the electronic component is returned to whether it is less than the preset humidity value, if it is less than the preset humidity value, it meets the requirements.

[0101] In addition, it also includes that if the maximum humidity data and the minimum humidity data in all collected storage space data are greater than the preset value, the standard humidity, the nitrogen input is immediately started; if the humidity data that does not meet the standard is less than n, n is preferably 1, and other data are less than the preset value of the standard humidity, the nitrogen input is delayed to start, and if all data have reached the standard within x seconds of the delay time, the delay start command is interrupted.

[0102] The above, the scheme disclosed in the application adjusts the space structure on the hardware to realize the functions of saving resources and precise humidity management; in product management, based on the configuration of electronic tag function (low cost and strong operability), the configuration of software control logic can realize product management, especially the exposure time management of moisture sensitive components, which has significant advantages. After the system is configured, if it is necessary to adjust the management logic, only new software program needs to be burned to realize it, without changing other hardware structure.

[0103] In addition, it should be noted that the specific embodiments described in the specification, the shape of the components, the name taken, etc. can be different. Any equivalent or simple change made according to the structure, features and principles described in the patent concept of the application is included in the protection scope of the application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, as long as they do not deviate from the structure of the application or exceed the scope defined by the claims, which should belong to the protection scope of the application.

Claims

1. An electronic component storage cabinet, characterized in that: Includes the following structures: A plurality of storage spaces, each of which is provided with a plurality of placement slots for placing electronic components; Cabinet door: Each storage space is equipped with an independent cabinet door, and a sealing strip is provided on the inner wall of the cabinet door or the outer edge of the storage space; Nitrogen input port, used to input nitrogen, the nitrogen input port is connected to the solenoid valve; A flow meter is connected to the nitrogen inlet to control the nitrogen input flow rate; a barometer connected to the storage space and used to detect the air pressure in the storage space; Humidity sensor, used to detect humidity data in the storage space; The main controller is connected to the humidity sensor and receives the humidity data in the storage space; the main controller is connected to the solenoid valve and sends an open / close instruction to the solenoid valve; A first tag is disposed on the surface of the placement slot, and the first tag transmits a first tag signal. A shielding layer is disposed above the first tag. The shielding layer is away from the first tag when no external pressure is applied, and is close to the first tag when external pressure is applied, thereby shielding the first tag signal. A card reader is connected to the main controller and sends the read first tag information and a signal flag indicating whether the first tag is read to the main controller; The card reader is further configured to identify a second tag carried by an item placed on the placement slot, the second tag emitting a second tag signal; the second tag is a tear-off tag, which is disposed at the opening of the packaging bag of the electronic components stored in the storage space. After unpacking, the tear-off tag is torn, and the card reader cannot read the second tag signal; The main controller implements the following steps: In response to the device placement state changing from presence to absence, triggering the timing unit of the main controller to start timing and obtain a timestamp A; In response to the device placement state from zero to one: If the second tag signal is recognized and the current placement slot has timestamp A, then stop the timer, clear the cache, and record the current second tag information; If the second tag signal is not recognized and the current placement slot has timestamp A, determine whether the currently received humidity data meets the requirements. 1) If it meets the requirements, obtain the first time data based on the time length from timestamp A to the current time, calculate the second time data based on the first time data, and start timing to obtain timestamp B. Based on the second time data and timestamp B, calculate the time data for allowing the cabinet door to be opened; 2) If it does not meet the requirements, fill the storage cabinet with nitrogen until the humidity data meets the requirements. After the humidity data meets the requirements, calculate the time data for allowing the cabinet door to be opened according to step 1).

2. The electronic component storage cabinet according to claim 1, characterized in that: The first label information includes: a storage space number, a placement slot number, and an electronic component type number.

3. The electronic component storage cabinet according to claim 1, characterized in that: There are a plurality of humidity sensors, and one humidity sensor is set in each storage space; The main controller receives the temperature and humidity data from all humidity sensors and comprehensively analyzes the overall temperature and humidity data of the storage cabinet; Based on the overall temperature and humidity data of the storage cabinet, an open / close command is sent to the solenoid valve connected to the nitrogen inlet.

4. A method for storing and managing electronic components, characterized in that: The electronic component storage cabinet according to any one of claims 1 to 3 comprises the following steps: Place or remove electronic components according to the storage labels on the cabinet doors; In response to the device placement state changing from presence to absence, triggering the timing unit of the main controller to start timing and obtain a timestamp A; In response to the device placement state from zero to one: If the second tag signal is recognized and the current placement slot has timestamp A, then stop the timer, clear the cache, and record the current second tag information; If the second tag signal is not recognized and the current placement slot has timestamp A, determine whether the currently received humidity data meets the requirements. 1) If it meets the requirements, obtain the first time data based on the time length from timestamp A to the current time, calculate the second time data based on the first time data, and start timing to obtain timestamp B. Based on the second time data and timestamp B, calculate the time data for allowing the cabinet door to be opened; 2) If it does not meet the requirements, fill the storage cabinet with nitrogen until the humidity data meets the requirements. After the humidity data meets the requirements, calculate the time data for allowing the cabinet door to be opened according to step 1).

5. The electronic component storage and management method according to claim 4, characterized in that: The first time data is a first exposure time of the electronic component, and the first time data is greater than a second exposure time of the electronic component exposed to an environment that does not meet the humidity value; The second time data is n times the first exposure time, and the value of n is calculated based on the requirement that the electronic components are returned to the nitrogen cabinet and dried in an environment that meets the humidity value to restore the workshop life.

6. The electronic component storage and management method according to claim 4, characterized in that: The method for determining whether the currently received humidity data meets the requirements includes: Calculate the average and maximum humidity values ​​output by all sensors in the nitrogen cabinet. If both the average and maximum values ​​are less than the preset humidity value, the requirements are met. Alternatively, the humidity value output by the sensor in the storage space currently placed back into the electronic component is compared to see whether it is less than a preset humidity value. If so, the requirement is met.

7. The electronic component storage and management method according to claim 4, characterized in that: After the electronic component is removed, the timing unit reaches a first preset time, clears the timing data and marks the number of the removed electronic component, and the first preset time is greater than the maximum exposure time of the electronic component.

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