A coal mine permissible electronic control module and a detection method and a preparation method thereof

Abstract

This invention discloses a permissible electronic control module for coal mines, along with its testing and manufacturing methods. The method includes coding, a first test, and a second test. The first and second tests involve multiple testing items, such as communication ID confirmation, duplicate code detection, resistance detection, current testing, ignition capacitor detection, bridge wire detection, low-voltage detonation testing, high-voltage detonation testing, delay accuracy testing, and diode testing. This invention performs multi-angle testing on the electronic control module, resulting in more precise and detailed testing methods that prevent accidental detonation. The measurement of delay accuracy ensures instantaneous detonation response during detonation, improving product safety. A glue-filled coating is added to the electronic control module to effectively protect and fix components and soldered parts, preventing loosening or detachment under external forces and avoiding interference from external moisture, dust, and static electricity. This electronic control module can be efficiently manufactured through processes such as surface mount technology (SMT), reflow soldering, and encapsulation, resulting in high efficiency.

Description

Technical Field

[0001] This invention belongs to the field of civil explosives technology, specifically relating to a permissible electronic control module for coal mines and its detection and preparation methods. Background Technology

[0002] In the existing electronic detonator manufacturing process, the ignition control circuit board with the ignition element and detonator leads welded on is usually inserted into the detonator fire tube, and the detonator fire tube is then sealed with a bayonet to complete the assembly of the electronic detonator.

[0003] Typically, the ignition control circuit board has an ignition element soldered to one end and a detonator lead soldered to the other. Multiple electronic components are also soldered onto the circuit board. When the electronic detonator is subjected to vibration, the exposed components and solder joints are easily loosened or even detached, affecting the reliability of the electronic detonator. Furthermore, external factors such as moisture, dust, and static electricity can easily impact the product's performance, leading to unstable quality during production and instability during on-site blasting applications, potentially causing safety accidents.

[0004] Therefore, some products use heat shrink tubing for insulation encapsulation, while others only use electronic component encapsulation adhesive to cure and reinforce the electronic components. However, the above manufacturing processes are all carried out in batches, resulting in low production efficiency. Furthermore, the encapsulated products are irregular and cannot effectively achieve resistance to static electricity, AC current, DC current, and mechanical shock. At the same time, the related product testing procedures are inadequate, leading to a high defect rate. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention aims to provide a permissible electronic control module for coal mines, as well as its detection and preparation methods.

[0006] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows:

[0007] A permissible electronic control module for coal mines includes a circuit board assembly. The circuit board assembly includes multiple ignition control circuit boards arranged at equal intervals. The ignition control circuit boards are provided with components and lead solder, all of which are completely covered by injection molding compound. The injection molding compound located on one side of the components is trapezoidal and cooperates with the lower mold during injection molding. The injection molding compound located on the other side of the components is cylindrical and cooperates with the upper mold during injection molding.

[0008] Furthermore, the distance between two adjacent ignition control circuit boards is 8.0 ± 0.1 mm.

[0009] Furthermore, the cylinder is provided with a groove and a glue-reducing opening, the diameter and height of which are 2mm and 0.2mm, respectively.

[0010] Furthermore, the dimensions of the injection body are 5.66*16.5*5.58mm, and the injection amount is 0.3g.

[0011] Furthermore, the ignition control circuit board has components on its front side, solder pins on its back side, and positioning holes symmetrically arranged on opposite sides of the circuit board assembly.

[0012] This invention also discloses a method for detecting a permissible electronic control module for coal mines, comprising the following steps:

[0013] Step 1: Code the electronic control module:

[0014] Based on the manufacturer information, quantity, and chip type of the ordered products, and combined with the internal ID number range allocation, the coding information is formulated, and then the coding is carried out according to the production requirements.

[0015] Step Two, First Test:

[0016] The module testing equipment is used to perform multiple tests, including communication ID confirmation, current test, charging time test, ignition capacitor detection, bridge wire detection, low-voltage detonation test, high-voltage detonation test, delay accuracy test, and diode test, to eliminate defective products and confirm the prevention of accidental detonation.

[0017] Step 3, Second Test:

[0018] Multiple tests are performed on the modules using a dual-testing device, including communication ID confirmation, duplicate code detection, charging time test, resistance value test, current test, ignition capacitor test, and bridge wire test, to eliminate defective products.

[0019] Furthermore, in step one, the coding parameters of the electronic control module are as follows: Table 1:

[0020] Table 1

[0021] Test Items Parameter range unit Remark Charging time for code 7 S Program settings Voltage 8 V —— Current code 5～50 uA —— .

[0022] Furthermore, in step two, the detection electrical characteristic parameters of the electronic control module are shown in Table 2 below:

[0023] Table 2

[0024]

[0025] Furthermore, in step three, the electrical characteristic parameters of the electronic control module for secondary detection are shown in Table 3 below:

[0026] Table 3

[0027] Test Items Parameter range unit Remark Duplicate code detection Is there a duplicate code? —— —— Resistance testing 1.7～2.3 Ω —— 20V test charging time 13 S Program settings 20V high voltage forward and reverse current 18～30 uA —— 20V High Voltage Communication ID Reader - Bipolar Is it qualified? —— —— ignition capacitor detection Is it qualified? —— —— Bridge wire testing Is it qualified? —— —— .

[0028] This invention also discloses a method for preparing a permissible electronic control module for coal mines, comprising the following steps:

[0029] 1) Prepare materials and place them in an electrostatic box;

[0030] 2) PCB panelization and board making;

[0031] 3) Solder paste printing: The solder paste storage temperature is 0-10℃, the solder paste warming time is 3-4 hours, and the solder paste stirring time is 1-3 minutes;

[0032] 4) Patch panel;

[0033] 5) Reflow soldering: Heat at 110-170℃ at a rate of 1.2-1.8℃ / s, preheat temperature is 75-110℃, preheat time is 90-120s, reflow temperature is above 139℃, reflow time is 60-100s, and maximum temperature is 165-175℃; this step is a full-board reflow soldering to ensure uniform soldering on each circuit board;

[0034] 6) Use AOI for visual inspection;

[0035] 7) Plate separation;

[0036] 8) Glue injection: The glue injection time is 3-4 seconds, the pressure holding time is 4-6 seconds, the cooling time is 13-16 seconds, and the glue usage is 0.3g / pcs;

[0037] 9) Welding: Welding is done by spot welding. The temperature is set at 320±10℃. The welding rod is attached to the spot welding point. The preheating solder tip is 1.5-1.8mm, the preheating time is 0.2-0.3s, and the solder tip speed is 30-35mm / s. The second stage solder feeding is 1.2-1.5mm and the solder feeding speed is 30-35mm / s.

[0038] 10) Laser marking, finished product inspection, packaging, and shipping.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] 1) This invention discloses a permissible electronic control module for coal mines, wherein the injection body can completely cover the components on each ignition control circuit board, thereby providing good protection and fixation for the soldering parts of the components, preventing the components or solder joints from loosening or falling off under the action of external forces such as mechanical vibration, and also avoiding interference from external moisture, dust, static electricity, etc. on the product performance, which is beneficial to improving the product's vibration resistance. The injection body has different shapes on both sides of the components. One side is a trapezoidal structure, which cooperates with the lower mold during injection molding. The trapezoidal shape covers the components, providing stable coverage and protection while using the least amount of glue. The other side is a cylindrical structure, which cooperates with the upper mold during injection molding. The cylinder has grooves and a glue reduction gate. The cylindrical structure is designed to minimize the glue sealing position on the upper frame of the mold, and the remaining positions are all empty in the mold, reducing burrs and avoiding the risk of interference between parts. At the same time, the glue residue problem is reduced by designing a glue reduction gate, which greatly improves the glue utilization rate to 99.5%.

[0041] 2) This invention discloses a method for preparing a permissible electronic control module for coal mines. It can efficiently complete the preparation of the entire board through processes such as overall surface mount, reflow soldering, and encapsulation. This method is significantly better than the one-on-one preparation method in the prior art, which significantly improves production efficiency. At the same time, it can ensure the uniformity of the soldering effect on each circuit board, resulting in high product quality and reliable and stable performance.

[0042] 3) In response to the high testing requirements of coal mine permit products, this invention discloses a testing method for a coal mine permit type electronic control module, which can perform multiple tests such as communication ID confirmation, current testing, charging time testing, ignition capacitor testing, bridge wire testing, low-voltage detonation testing, high-voltage detonation testing, delay accuracy testing, and diode testing. The testing method is more accurate and detailed, which can maximize the rejection of defective products and prevent accidental detonation. The newly added delay accuracy measurement can ensure the instantaneous detonation response during detonation and improve the safety of the product. Attached Figure Description

[0043] Figure 1 This is a three-dimensional rear view of a permissible electronic control module for coal mines according to the present invention.

[0044] Figure 2 This is a front perspective view of a permissible electronic control module for coal mines according to the present invention.

[0045] Figure 3 This is a schematic diagram of the structure of a coal mine-permitted electronic control module of the present invention when it is not injection molded or injected with colloid. Detailed Implementation

[0046] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0047] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0048] On the one hand, the present invention provides a permissible electronic control module for coal mines, such as... Figure 1-3 As shown, the module has a diameter of 6.0±0.1mm, a side dimension of 5.66±0.1mm, and a length of 34.5±0.5mm. The module includes a circuit board assembly 1, which is composed of multiple ignition control circuit boards 2 connected at equal intervals. This equal-interval design facilitates the soldering of components on each ignition control circuit board 2 and simplifies the low-pressure injection molding process, thus improving production efficiency. The spacing between two adjacent ignition control circuit boards is 8.0±0.1mm, and the actual spacing can be flexibly adjusted according to actual needs. Each ignition control circuit board 2 has components on its front side and solder leads on its back side. A potting compound 3 is formed on each ignition control circuit board 2, ensuring that the potting compound 3 can bond the components and leads. The solder joints are completely covered, and the injection molding compound 3 protects and fixes the components and their soldered parts, preventing them from loosening or falling off under external forces such as mechanical vibration. This improves the product's vibration resistance. To further enhance the protective effect of the injection molding compound 3 while reducing the amount of glue used, the invention cleverly designs the injection molding compound 3 in two shapes: the injection molding compound 3 on one side of the component is trapezoidal (facing downwards, i.e., it cooperates with the lower mold during injection molding), and the injection molding compound 3 on the other side of the component is cylindrical (facing upwards, i.e., it cooperates with the upper mold during injection molding). The cylinder has a groove 4 to improve the bonding force during overall sealing, and a glue reduction port 5 with a diameter and height preferably of 2mm and 0.2mm, respectively, to prevent glue residue and improve glue utilization. To achieve precise positioning, the invention additionally provides symmetrical positioning holes 6 on opposite sides of the circuit board assembly 1.

[0049] As one specific implementation method, the dimensions of the injection body 3 are preferably 5.66*16.5*5.58mm, the injection amount is preferably 0.3g, and the material is preferably NA glue.

[0050] On the other hand, the present invention also provides a method for preparing a permissible electronic control module for coal mines, comprising the following steps:

[0051] 1) Prepare materials and place them in an electrostatic box;

[0052] 2) PCB panelization and board making;

[0053] 3) Solder paste printing: The solder paste storage temperature is 0-10℃, the solder paste warming time is 3-4 hours, and the solder paste stirring time is 1-3 minutes;

[0054] 4) Patch panel;

[0055] 5) Reflow soldering: Heat at 110-170℃ at a rate of 1.2-1.8℃ / s, preheat temperature is 75-110℃, preheat time is 90-120s, reflow temperature is above 139℃, reflow time is 60-100s, and maximum temperature is 165-175℃; this step is a full-board reflow soldering to ensure uniform soldering on each circuit board;

[0056] 6) Use AOI for visual inspection;

[0057] 7) Plate separation;

[0058] 8) Injection: Injection time is 3-4s, preferably 4s; holding pressure time is 4-6s, preferably 5s; cooling time is 13-16s, preferably 15s; the amount of adhesive used is 0.3g / pcs.

[0059] 9) Welding: Welding is done by spot welding. The temperature is set at 320±10℃. The welding rod is attached to the spot welding point. The preheating solder tip is 1.5-1.8mm (preferably 1.5mm), the preheating time is 0.2-0.3s (preferably 0.2s), and the solder tip speed is 30-35mm / s (preferably 35mm / s). The second stage solder feeding is 1.2-1.5mm (preferably 1.2mm) and the solder feeding speed is 30-35mm / s (preferably 35mm / s).

[0060] 10) Laser marking, finished product inspection, packaging, and shipping.

[0061] This invention also provides a method for detecting permissible electronic control modules in coal mines, comprising the following steps:

[0062] Step 1, Code Registration: Based on the manufacturer information, quantity per second, and chip type of the ordered products, and in conjunction with the internal ID number range allocation, code registration information is formulated; the code is then registered according to production requirements using the ID code registration device and the provided code registration information.

[0063] In this step, the ID coding device includes a host computer with ID coding device software and a slave computer connected to the host computer (refer to the Chinese authorized patent with announcement number CN217560486U). The coding function for coal is as follows: the coding voltage is set, and after the slave computer is powered on, it starts to read the current value of the electronic control module. If the current value read at any time within 7 seconds is within the current specification range, the electrical performance is tested and the coding information is transmitted by the host computer before coding begins. If the current is still not within the specification range after 7 seconds, the corresponding error message is displayed.

[0064] The electronic control module's registration parameters are shown in Table 1 below:

[0065] Table 1

[0066] Test Items Parameter range unit Remark Charging time for code 7 S Program settings Voltage 8 V —— Current code 5～50 uA ——

[0067] Step Two, First Test: For coal-fired detonators, the testing requirements differ from those for general electronic detonators, necessitating more precise and detailed test parameters. Therefore, this invention proposes using a module-level first test device to perform multi-faceted and multi-angle testing, including communication ID verification, current testing, ignition capacitor detection, bridge wire detection, low-voltage detonation, high-voltage detonation, and diode testing, to eliminate defective products and ensure prevention of accidental detonation. The electrical characteristic parameters of the electronic control module tested are shown in Table 2 below:

[0068] Table 2

[0069]

[0070] In this step, both 8V and 20V voltages can provide charging and communication. The reason for the boost adjustment is that, since this is a test circuit, 20V is a high voltage, which can prevent some components from being unable to withstand it and can screen out faulty components. The measurement of delay accuracy is essential in the coal mining industry. Because, according to the test in the coal seam of high-gas mines, the gas concentration is far from reaching the explosion limit within 130ms. Therefore, the delay time of the delayed detonator must not exceed 130ms, otherwise there will be a major safety hazard. The measurement of delay accuracy can ensure the instantaneous explosion response at the time of detonation.

[0071] Step 3, Second Test: Use the module's second test equipment to perform communication ID confirmation, duplicate code detection, resistance value detection, current testing, ignition capacitor detection, bridge wire detection, etc., and reject defective products; the electrical characteristic parameters of the electronic control module for the second test are shown in Table 3 below:

[0072] Table 3

[0073] Test Items Parameter range unit Remark Duplicate code detection Is there a duplicate code? —— —— Resistance testing 1.7～2.3 Ω —— 20V test charging time 13 S Program settings 20V high voltage forward and reverse current 18～30 uA —— 20V High Voltage Communication ID Reader - Bipolar Is it qualified? —— —— ignition capacitor detection Is it qualified? —— —— Bridge wire testing Is it qualified? —— —— .

[0074] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0075] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for detecting a permitted electronic control module for coal mines, characterized in that, The permitted electronic control module for coal mines includes a circuit board assembly, which includes multiple ignition control circuit boards arranged at equal intervals. The ignition control circuit boards are provided with components and lead solder, all of which are completely covered by potting compound. The ignition control circuit board has components on the front and solder pins on the back. The circuit board assembly has symmetrical positioning holes on opposite sides. The distance between two adjacent ignition control circuit boards is 8.0 ± 0.1 mm; The injection mold has different shapes on both sides of the component. One side is trapezoidal, which cooperates with the lower mold during injection molding to cover the component, providing stable protection while using minimal glue. The other side is cylindrical, which cooperates with the upper mold during injection molding. The cylinder has a groove and a glue reduction opening. The diameter and height of the glue reduction opening are 2mm and 0.2mm, respectively. The cylindrical structure is designed to minimize the glue sealing position on the upper frame of the mold, and to completely avoid the remaining positions in the mold, reducing burrs and avoiding the risk of interference between parts. At the same time, the glue reduction opening reduces the problem of glue residue. The dimensions of the injection body are 5.66*16.5*5.58mm, and the injection amount is 0.3g; The detection method includes the following steps: Step 1: Code the electronic control module: Based on the manufacturer information, quantity, and chip type of the ordered products, and combined with the internal ID number range allocation, the coding information is formulated, and then the coding is carried out according to the production requirements. Step Two, First Test: The module testing equipment is used to perform multiple tests, including communication ID confirmation, current test, charging time test, ignition capacitor detection, bridge wire detection, low-voltage detonation test, high-voltage detonation test, delay accuracy test, and diode test, to eliminate defective products and confirm the prevention of accidental detonation. Step 3, Second Test: Multiple tests are performed on the modules using a dual-testing device, including communication ID confirmation, duplicate code detection, charging time testing, resistance testing, current testing, ignition capacitor testing, and bridge wire testing, to eliminate defective products.

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