Gas pressure monitoring alarm switching device
By designing a gas pressure monitoring and alarm switching device, nitrogen pressure can be monitored and adjusted in real time, solving the problem of high defect rate caused by welding defects and improving production stability and product quality.
Patent Information
- Application Number
- CN202520519775.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-24
AI Technical Summary
In existing technologies, high defect rates are caused by welding defects, mainly due to weld point oxidation. The inability to monitor and adjust nitrogen pressure in the furnace in real time leads to unstable production and increased production costs.
Design a gas pressure monitoring alarm switching device, including a gas source supply mechanism, a gas path switching mechanism and a blocking mechanism. The device monitors and regulates nitrogen pressure in real time through a pressure sensor and a flow regulating valve, and alarms or blocks the feed when the pressure is abnormal, so as to ensure the stability of nitrogen supply.
It enables real-time monitoring and regulation of nitrogen pressure, avoiding the generation of defective products, improving production stability and product quality, and reducing the defect rate.
Smart Images
Figure CN223869029U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas pressure monitoring technology, specifically to a gas pressure monitoring alarm switching device. Background Technology
[0002] The miniaturization of components and the multi-functionality of products on circuit boards have driven the high-density and three-dimensional design of circuit board mounting. This is characterized by increasingly dense solder joints, smaller solder joint sizes, and finer spacing. Soldering defects are a major factor affecting the quality of electronic products. To ensure the quality of surface mount electronic products, the characteristics of reflow soldering, a core step in the surface mount process, were analyzed. Based on the temperature and process characteristics of reflow soldering, several common soldering defects that occur during reflow soldering, such as solder balls, bridging, wicking, voids, Manhattan effect, and distortion of the oxygen concentration monitoring system in the PCB reflow oven, were discussed. To effectively reduce the incidence of soldering defects and improve the soldering quality of reflow soldering, the industry currently uses a method of directly supplying nitrogen to the furnace and manually adjusting the nitrogen level using a regulating valve to maintain a constant and large supply of nitrogen to the furnace to ensure solder joint quality and prevent oxidation. However, during manual adjustment, it is impossible to detect whether the nitrogen pressure inside the furnace is constant. During production, some areas may lack nitrogen, leading to oxidized solder joints on the PCB board, failing to meet standards, producing more defective products, and increasing production costs. In view of the above shortcomings, it is necessary to design a gas pressure monitoring alarm switching device. Utility Model Content
[0003] The purpose of this invention is to provide a gas pressure monitoring alarm switching device to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a gas pressure monitoring alarm switching device, comprising a gas supply mechanism, a gas path switching mechanism, and a blocking mechanism. The gas supply mechanism is connected to a reflow oven, and a blocking mechanism is installed at the front end of the reflow oven. The gas supply mechanism is equipped with a gas path switching mechanism, which includes a first pressure sensor, a first flow regulating valve, a second pressure sensor, and a second flow regulating valve.
[0005] Preferably, the gas supply mechanism includes a first nitrogen storage tank, a first nitrogen generator, a second nitrogen storage tank, a nitrogen purification device, and a second nitrogen generator. The first nitrogen storage tank is connected to a first gas supply branch pipe, which is connected to a main gas supply pipe. The first nitrogen storage tank is connected to the outlet of the first nitrogen generator through a first pipeline, and a first one-way valve is installed on the first pipeline.
[0006] Preferably, the second nitrogen storage tank is connected to the second gas supply branch pipe, the second gas supply branch pipe is connected to the main gas supply pipe, the second nitrogen storage tank is connected to the nitrogen purification device through the second pipeline, the second pipeline is equipped with a second check valve, the nitrogen purification device is connected to the outlet of the second nitrogen generator through the third pipeline, the third pipeline is equipped with a third check valve.
[0007] Preferably, the first pressure sensor is installed on the first air supply branch pipe, and a first flow regulating valve is installed on the first air supply branch pipe; the second pressure sensor is installed on the second air supply branch pipe, and a second flow regulating valve is installed on the second air supply branch pipe.
[0008] Preferably, the blocking mechanism includes a blocking cylinder and a blocking plate. The blocking cylinder is installed on the top of the frame, and a groove is provided on the inner side of the frame. The blocking plate is slidably arranged inside the frame. The top of the blocking plate is fixedly connected to the piston rod of the blocking cylinder. Slider blocks are installed at both ends of the blocking plate and are slidably arranged in the groove.
[0009] Preferably, the frame is installed at the front end of the reflow oven, the front end of the reflow oven is provided with a feed inlet, and a host computer is provided on the reflow oven.
[0010] Compared with the prior art, the technical solution provided by this utility model has at least the following technical effects or advantages:
[0011] This utility model is equipped with a gas path switching mechanism, which can switch between two nitrogen supply of different purities via a host computer (first flow regulating valve open / second flow regulating valve closed, first flow regulating valve closed / second flow regulating valve open, both first and second flow regulating valves open, both first and second flow regulating valves closed). It can also monitor the pressure data of the gas source in real time. By setting preset values for monitoring two nitrogen of different purities, when the pressure sensor detects a pressure value higher or lower than the set value, the alarm light will illuminate. At the same time, the blocking cylinder of the blocking mechanism will push the blocking plate to block the reflow oven from feeding, thereby avoiding the generation of more defective products due to unstable gas supply.
[0012] This utility model is equipped with a gas supply mechanism. By starting the first nitrogen generator, the nitrogen produced by the first nitrogen generator is transported to the first nitrogen storage tank through the first pipeline. The first nitrogen storage tank stores the nitrogen. The nitrogen in the first nitrogen storage tank can be supplied to the reflow oven through the first gas supply branch pipe and the main gas supply pipe. By starting the second nitrogen generator, the nitrogen produced by the second nitrogen generator enters the nitrogen purification device through the third pipeline. After passing through the nitrogen purification device, high-purity nitrogen can be obtained. The high-purity nitrogen purified by the nitrogen purification device is transported to the second nitrogen storage tank through the second pipeline. The high-purity nitrogen in the second nitrogen storage tank can be supplied to the reflow oven through the second gas supply branch pipe and the main gas supply pipe, thereby enabling the supply of two nitrogen gases of different purities. Attached Figure Description
[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the blocking mechanism in this utility model.
[0016] In the attached image:
[0017] 1. Gas supply mechanism; 101. First nitrogen storage tank; 102. First gas supply branch pipe; 103. Main gas supply pipe; 104. First pipeline; 105. First nitrogen generator; 106. First check valve; 107. Second nitrogen storage tank; 108. Second gas supply branch pipe; 109. Second pipeline; 110. Nitrogen purification device; 111. Second check valve; 112. Third pipeline; 113. Second nitrogen generator; 114. Third check valve; 2. Gas path switching mechanism; 201. First pressure sensor; 202. First flow regulating valve; 203. Second pressure sensor; 204. Second flow regulating valve; 205. Controller; 206. First alarm light; 207. Second alarm light; 3. Blocking mechanism; 301. Blocking cylinder; 302. Frame; 303. Slide groove; 304. Blocking plate; 305. Slider; 4. Reflow oven. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figure 1 and 2 As shown, this utility model provides a technical solution: a gas pressure monitoring alarm switching device, including a gas source supply mechanism 1, a gas path switching mechanism 2 and a blocking mechanism 3. The gas source supply mechanism 1 is connected to a reflow oven 4. The blocking mechanism 3 is installed at the front end of the reflow oven 4. The gas path switching mechanism 2 is installed on the gas source supply mechanism 1.
[0020] The gas supply mechanism 1 in this embodiment includes a first nitrogen storage tank 101, a first nitrogen generator 105, a second nitrogen storage tank 107, a nitrogen purification device 110, and a second nitrogen generator 113. The first nitrogen storage tank 101 is connected to a first gas supply branch pipe 102, which is connected to a main gas supply pipe 103. The first nitrogen storage tank 101 is connected to the outlet of the first nitrogen generator 105 via a first pipe 104. A first... One-way valve 106, second nitrogen storage tank 107 is connected to second gas supply branch pipe 108, second gas supply branch pipe 108 is connected to main gas supply pipe 103, second nitrogen storage tank 107 is connected to nitrogen purification device 110 through second pipe 109, second one-way valve 111 is installed on second pipe 109, nitrogen purification device 110 is connected to the gas outlet of second nitrogen generator 113 through third pipe 112, third one-way valve 114 is installed on third pipe 112.
[0021] The gas path switching mechanism 2 in this embodiment includes a first pressure sensor 201, a first flow regulating valve 202, a second pressure sensor 203, and a second flow regulating valve 204. The first pressure sensor 201 is installed on the first gas supply branch pipe 102, and the first flow regulating valve 202 is installed on the first gas supply branch pipe 102. The second pressure sensor 203 is installed on the second gas supply branch pipe 108, and the second flow regulating valve 204 is installed on the second gas supply branch pipe 108. The second flow regulating valve 204 is electrically connected to the controller 205. The controller 205 is electrically connected to the first flow regulating valve 202, the first alarm light 206, the second alarm light 207, the first nitrogen generator 105, the first check valve 106, the nitrogen purification device 110, the second check valve 111, the second nitrogen generator 113, the third check valve 114, and the blocking cylinder 301.
[0022] The blocking mechanism 3 in this embodiment includes a blocking cylinder 301 and a blocking plate 304. The blocking cylinder 301 is installed on the top of the frame 302. A groove 303 is provided on the inner side of the frame 302. The blocking plate 304 is slidably arranged inside the frame 302. The top of the blocking plate 304 is fixedly connected to the piston rod of the blocking cylinder 301. Slider 305 is installed at both ends of the blocking plate 304. The slider 305 is slidably arranged in the groove 303. The frame 302 is installed at the front end of the reflow oven 4. A feed port is provided at the front end of the reflow oven 4. A host computer is provided on the reflow oven 4. The host computer is electrically connected to the first pressure sensor 201, the second pressure sensor 203 and the controller 205 respectively.
[0023] The working principle of this utility model is as follows: The host computer sets pressure values according to different production standards for the products, and starts the first nitrogen generator 105. The nitrogen generated by the first nitrogen generator 105 is transported to the first nitrogen storage tank 101 through the first pipeline 104. The first nitrogen storage tank 101 stores the nitrogen, eliminating the need for frequent starting and stopping of the first nitrogen generator 105. By opening the first flow regulating valve 202, the nitrogen in the first nitrogen storage tank 101 is transported to the reflow oven 4 through the first gas supply branch pipe 102 and the main gas supply pipe 103. The first pressure sensor 201 detects the pressure of the nitrogen output in the first gas supply branch pipe 102 and transmits the detected pressure information to the host computer. The host computer compares the pressure information with the preset value. When the pressure is less than or greater than the preset value, the host computer sends a control signal to the controller 205. The controller 205 controls the first alarm light 206 to sound and controls the first flow regulating valve 202 and the blocking cylinder 301 to operate. By adjusting the opening of the first flow regulating valve 202, the first gas supply... The pressure inside the gas supply branch pipe 102 causes the first gas supply branch pipe 102 to reach a set pressure value. The blocking cylinder 301 pushes the blocking plate 304 to move, causing the blocking plate 304 to move downward along the slide groove 303. This moves the blocking plate 304 to the front end of the feed port of the reflow oven 4, blocking the feed of the reflow oven 4. When the pressure detected by the first pressure sensor 201 reaches the preset value, the host computer sends a control signal to the controller 205. The controller 205 controls the blocking cylinder 301 to drive the blocking plate 304 to move upward, allowing the feed port of the reflow oven 4 to feed normally and the reflow oven 4 to be in working condition. In this method, the first pressure sensor 201 can detect the pressure of the gas output from the first gas supply branch pipe 102 in real time and transmit the detected pressure information to the host computer. The host computer compares the pressure information with the preset value and sends a control signal to the controller 205. The controller controls the first alarm light 206 and the blocking mechanism 3 to work, thereby avoiding the generation of more defective products due to unstable gas supply.
[0024] This utility model is equipped with a gas supply mechanism 1. By starting the first nitrogen generator 105, the nitrogen produced by the first nitrogen generator 105 is transported to the first nitrogen storage tank 101 through the first pipeline 104. The first nitrogen storage tank 101 stores the nitrogen. The nitrogen in the first nitrogen storage tank 101 can be supplied to the reflow oven 4 through the first gas supply branch pipe 102 and the main gas supply pipe 103. By starting the second nitrogen generator 113, the nitrogen produced by the second nitrogen generator 113 enters the nitrogen purification device 110 through the third pipeline 112. After passing through the nitrogen purification device, high-purity nitrogen can be obtained. The high-purity nitrogen purified by the nitrogen purification device 110 is transported to the second nitrogen storage tank 107 through the second pipeline 109. The high-purity nitrogen in the second nitrogen storage tank 107 can be supplied to the reflow oven 4 through the second gas supply branch pipe 108 and the main gas supply pipe 103, thereby enabling the supply of two nitrogen gases of different purities.
[0025] This utility model is equipped with a gas path switching mechanism 2, which can switch between two nitrogen supply sources of different purities via a host computer (first flow regulating valve 202 open / second flow regulating valve 204 closed, first flow regulating valve 202 closed / second flow regulating valve 204 open, both first flow regulating valve 202 and second flow regulating valve 204 open, both first flow regulating valve 202 and second flow regulating valve 204 closed). It can also monitor the pressure data of the gas source in real time. By setting preset values for monitoring two nitrogen sources of different purities, when the pressure sensor detects a pressure value higher or lower than the set value, the alarm light will illuminate. At the same time, the blocking cylinder 301 of the blocking mechanism 3 will push the blocking plate 304 to block the reflow oven 4 from feeding, thereby avoiding the generation of more defective products due to unstable gas supply.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A gas pressure monitoring alarm switching device, characterized in that: It includes a gas supply mechanism (1), a gas path switching mechanism (2) and a blocking mechanism (3). The gas supply mechanism (1) is connected to the reflow oven (4). The blocking mechanism (3) is installed at the front end of the reflow oven (4). The gas supply mechanism (1) is equipped with a gas path switching mechanism (2). The gas path switching mechanism (2) includes a first pressure sensor (201), a first flow regulating valve (202), a second pressure sensor (203) and a second flow regulating valve (204).
2. The gas pressure monitoring alarm switching device according to claim 1, characterized in that: The gas supply mechanism (1) includes a first nitrogen storage tank (101), a first nitrogen generator (105), a second nitrogen storage tank (107), a nitrogen purification device (110), and a second nitrogen generator (113). The first nitrogen storage tank (101) is connected to the first gas supply branch pipe (102), and the first gas supply branch pipe (102) is connected to the main gas supply pipe (103). The first nitrogen storage tank (101) is connected to the outlet end of the first nitrogen generator (105) through the first pipeline (104). A first one-way valve (106) is installed on the first pipeline (104).
3. The gas pressure monitoring alarm switching device according to claim 2, characterized in that: The second nitrogen storage tank (107) is connected to the second gas supply branch pipe (108), the second gas supply branch pipe (108) is connected to the main gas supply pipe (103), the second nitrogen storage tank (107) is connected to the nitrogen purification device (110) through the second pipeline (109), the second one-way valve (111) is installed on the second pipeline (109), the nitrogen purification device (110) is connected to the outlet end of the second nitrogen generator (113) through the third pipeline (112), the third one-way valve (114) is installed on the third pipeline (112).
4. The gas pressure monitoring alarm switching device according to claim 1, characterized in that: The first pressure sensor (201) is installed on the first gas supply branch pipe (102), and the first gas supply branch pipe (102) is equipped with a first flow regulating valve (202). The second pressure sensor (203) is installed on the second gas supply branch pipe (108), and the second gas supply branch pipe (108) is equipped with a second flow regulating valve (204).
5. A gas pressure monitoring alarm switching device according to claim 1, characterized in that: The blocking mechanism (3) includes a blocking cylinder (301) and a blocking plate (304). The blocking cylinder (301) is installed on the top of the frame (302). A sliding groove (303) is provided on the inner side of the frame (302). The blocking plate (304) is slidably arranged inside the frame (302). The top of the blocking plate (304) is fixedly connected to the piston rod of the blocking cylinder (301). Slider (305) is installed at both ends of the blocking plate (304). The slider (305) is slidably arranged in the sliding groove (303).
6. A gas pressure monitoring alarm switching device according to claim 5, characterized in that: The frame (302) is installed at the front end of the reflow oven (4), the front end of the reflow oven (4) is provided with a feed port, and the host computer is provided on the reflow oven (4).