Electrochemical gas sensor pin welding device and welding method

Abstract

The application relates to an electrochemical gas sensor PIN pin welding device and a welding method, which comprises a PIN pin with a head, a middle part and a tail, the outer diameter of the middle part is larger than that of the head and the tail; a plate-shaped piece is provided with a plurality of first through holes, the inner diameter of the first through holes is matched with the head of the PIN pin and is smaller than the outer diameter of the middle part of the PIN pin; a welding tool comprises a bearing seat and at least one welding unit on the bearing seat, the welding unit is provided with a limiting groove and a plurality of containing holes on the bottom surface of the limiting groove, the limiting groove is used for containing the plate-shaped piece, the outer diameter of the middle part of the PIN pin is larger than the inner diameter of the containing hole, so that the tail of the PIN pin is suspended in the containing hole and a conductive wire is welded between the head of the PIN pin in the first through hole from above the first through hole.

Description

Technical Field

[0001] This invention relates to the field of electrochemical gas sensor technology, specifically to PIN pins for electrochemical gas sensors, and particularly to a PIN pin welding device and welding method for electrochemical gas sensors. Background Technology

[0002] Electrochemical gas sensors are characterized by their small size, light weight, portability, and excellent performance, and are widely used in important fields such as instrumentation, coal mining, shipbuilding, and petrochemicals. Based on electrochemical principles, these gas sensors can quickly detect gases such as oxygen, hydrogen, carbon monoxide, hydrogen sulfide, sulfur dioxide, and ammonia. They can also be used with circuitry and instruments to issue alarms when abnormal conditions are detected in the corresponding gases, allowing relevant personnel to take preventative measures and prepare for evacuation. Therefore, electrochemical gas sensors have become a popular research product in today's society.

[0003] Electrochemical sensors contain two crucial components: the PIN pin and the conductive wire. These are essential for forming the sensor's circuitry and act as a bridge connecting the current generated by the redox reaction to the circuitry display. Typically, due to the limitations of the internal structure of electrochemical gas sensors, the PIN pin and conductive wire need to be connected. Existing technologies mainly suffer from the following problems: PIN pins are soldered to conductive wires using current or laser. However, the soldered PIN pins and conductive wires are usually not very strong and are prone to falling off during sensor assembly or use. PIN pins and conductive wires are usually soldered individually, which makes assembly cumbersome and inefficient. The pins are small in size, and the soldering process requires appropriate tooling for soldering. Summary of the Invention

[0004] The purpose of this invention is to provide an electrochemical gas sensor PIN pin welding device and welding method based on the existing technology. The welding is convenient, the welding success rate is improved, and the structure is simple, environmentally friendly, and easy for batch welding.

[0005] To achieve the above objectives, a first aspect of the present invention provides an electrochemical gas sensor PIN bonding apparatus, comprising: A PIN needle has a head, a middle section, and a tail section, wherein the outer diameter of the middle section is set to be larger than the outer diameters of the head and the tail section. A plate-shaped component is provided with several first through holes, wherein the inner diameter of the first through holes is set to match the head of the PIN pin and is smaller than the outer diameter of the middle part of the PIN pin; A welding fixture includes a support base and at least one welding unit located on the support base. The welding unit has a limiting groove and several receiving holes located on the bottom surface of the limiting groove. The limiting groove is used to receive the plate-shaped part. The outer diameter of the middle part of the PIN pin is larger than the inner diameter of the receiving hole, such that the tail of the PIN pin hangs in the receiving hole and the conductive wire is welded from above the first through hole to the head of the PIN pin located in the first through hole.

[0006] Preferably, the middle part of the PIN pin is truncated cone-shaped.

[0007] Preferably, a second through hole is provided in the middle region of the plate-shaped member.

[0008] Preferably, the plate-shaped member has a thickness of 1 to 5 mm, is circular in shape, and has an outer diameter of 15 to 25 mm. The outer diameter of the plate-shaped member matches the inner diameter of the electrochemical gas sensor housing.

[0009] Preferably, the number of the first through holes is 2 to 5; the number of the receiving holes is 2 to 5.

[0010] Preferably, the height of the support base is 10 to 20 mm, the depth of the limiting groove is 0.5 to 2 mm, the inner diameter is 15 to 25 mm, the depth of the receiving hole is 3 to 8 mm, and the width is 3 to 5 mm, or the width of the receiving hole matches the tail of the PIN pin.

[0011] Preferably, the welding unit is located in the central region of the support, or the welding units are evenly distributed on the support.

[0012] Preferably, conductive welding points can be provided on both the front and back sides of the first through hole to further enhance the welding stability.

[0013] A second aspect of the present invention provides a method for welding a PIN pin to a conductive wire in an electrochemical gas sensor, wherein the welding apparatus is used to weld the PIN pin to the conductive wire, and the method includes: Step (1) Place the welding fixture on a horizontal operating table, and vertically place the PIN pins in the receiving holes one by one, with the heads facing upwards; Step (2) Place the plate into the limiting groove and make the first through hole pass through the head of the PIN pin; Step (3) Place a conductive wire at the head of the PIN pin; Step (4) Solder the head of the PIN pin to the conductive wire; Step (5) Remove the welded plate.

[0014] Preferably, in step (4), the head of the PIN pin and the conductive wire are soldered together using a soldering iron; or, solder paste is applied and then baked to solidify the pin.

[0015] The electrochemical gas sensor PIN pin welding device and welding method of the present invention uses a plate-shaped part as an intermediate support, which can improve assembly efficiency and overcome the problem of cumbersome individual assembly; the PIN pin is provided with a head, middle and tail, which not only facilitates welding, but also prevents the PIN pin from being damaged; welding is convenient and improves the product welding success rate; the structure is simple, environmentally friendly and easy for batch welding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the PIN pin structure in the PIN pin welding device for the electrochemical gas sensor of the present invention.

[0017] Figure 2 This is a schematic diagram of the welding fixture in the electrochemical gas sensor PIN pin welding device of the present invention.

[0018] Figure 3 for Figure 2 Schematic diagram of the cross section at point AA.

[0019] Figure 4a and 4b These are schematic diagrams of the plate-shaped component in the electrochemical gas sensor PIN pin welding device of the present invention from different perspectives.

[0020] Figure 5 This is a schematic diagram of the welded structure. Detailed Implementation

[0021] The following disclosure provides many different embodiments or examples to illustrate different components of embodiments of the present invention. Specific examples of the components and their arrangement will be disclosed below to simplify the description of this disclosure. Of course, these specific examples are not intended to limit this disclosure.

[0022] like Figures 1 to 5 The image shows a specific embodiment of the electrochemical gas sensor PIN pin soldering device of the present invention. The soldering device includes a PIN pin 1 having a head 101, a middle portion 102, and a tail portion 103. The PIN pin 1 is cylindrical in shape, and the outer diameter of the middle portion 102 is set to be larger than the outer diameters of the head 101 and the tail portion 103. Figure 4a and 4bThe plate-shaped component 3 shown has three first through holes 303. The inner diameter of the first through holes 303 is set to match the head 101 of the PIN pin, that is, to fit the outer diameter of the head 101 so that the head 101 of the PIN pin can pass through the first through hole 303. The inner diameter of the first through hole 303 is smaller than the outer diameter of the middle part 102 of the PIN pin. The welding fixture includes a support G1 and a welding unit located on the support G1. The welding unit has a limiting groove G2 and three receiving holes G3 located on the bottom surface of the limiting groove G2. The limiting groove G2 is used to receive the plate-shaped component 3. The outer diameter of the middle part 102 of the PIN pin is larger than the inner diameter of the receiving hole G3, so that the tail 103 of the PIN pin hangs in the receiving hole G3 and the conductive wire is welded from above the first through hole 303 to the head 101 of the PIN pin located in the first through hole 303.

[0023] The middle portion 102 of the PIN pin can be frustum-shaped, or the middle portion can be a platform-shaped structure. The PIN pin of the electrochemical gas sensor based on this invention has a head, a middle portion, and a tail portion. During the soldering process, the middle portion 102 of the PIN pin is located between the receiving hole G3 and the first through hole 303. On the one hand, it can hold the plate-shaped component 3 in place; on the other hand, it can keep the tail portion 103 of the PIN pin in a suspended state, facilitating soldering while preventing damage to the tail portion 103 of the PIN pin.

[0024] The plate-shaped part 3 is provided with a second through hole 302 in the middle area, preferably a central circular through hole, which can not only play a role in gas pressure relief during welding and assembly, but also facilitate the gripping of tools such as tweezers.

[0025] The plate-shaped component 3 has a thickness of 1 to 5 mm, is circular in shape, and has an outer diameter of 15 to 25 mm. The outer diameter of the plate-shaped component 3 matches the inner diameter of the electrochemical gas sensor housing. The plate-shaped component can be made of one or more composite materials selected from PA, PC, PCB, PP, and ABS.

[0026] The number of first through holes 303 is 2 to 5, and the number of first through holes can be matched according to the shape and number of PIN pins; the number of receiving holes G3 is 2 to 5. Conductive soldering points can be set on both the front and back of the first through holes to further enhance the soldering stability.

[0027] Regarding the specific dimensional design of the welding fixture, the present invention provides the following preferred method: the height of the bearing seat G1 is 10 to 20 mm, and its length and width can be specifically set according to actual needs; the depth of the limiting groove G2 is 0.5 to 2 mm, and the inner diameter is 15 to 25 mm; the depth of the receiving hole G3 is 3 to 8 mm, and the width is 3 to 5 mm, or the width of the receiving hole G3 matches the tail 103 of the PIN pin.

[0028] The welding units can be located in the central area of ​​the support G1, or they can be evenly distributed on the support G1, for example, 5 rows × 8 columns, or the number can be freely set according to actual needs.

[0029] This invention also provides a method for welding a PIN pin to a conductive wire in an electrochemical gas sensor. The welding apparatus described above is used to weld the PIN pin to the conductive wire. The method includes: Step (1) Place the welding fixture on a horizontal operating table, and vertically place the PIN pins in the receiving holes one by one, with the heads facing upwards; Step (2) Place the plate into the limiting groove and make the first through hole pass through the head of the PIN pin; Step (3) Place a conductive wire at the head of the PIN pin; Step (4) Solder the head of the PIN pin and the conductive wire; specifically, you can use a soldering iron with solder 4 to solder the head of the PIN pin and the conductive wire; or, you can use solder paste to bake and solidify the shape. Step (5) Remove the welded plate and set it aside.

[0030] like Figure 5 As shown, this is the welded plate-shaped part 3. The welding method provided by the present invention can use solder for welding, resulting in a solid structure and effectively solving the problem of conductive wires and PIN pins falling off during the assembly or use of sensors.

[0031] In this invention, the PIN pin has a platform-like structure in the middle, and the PIN pin head is attached to the plate-like component. Both components also serve a positioning function, cleverly solving the problem of welding position misalignment caused by the PIN pin length. The PIN pin and the welding device work together, complementing each other and enhancing the welding strength. The plate-like component, as an intermediate support, can be adapted to different electrochemical gas sensors based on the number of first through holes, and also facilitates batch welding of sensors and subsequent assembly of internal sensor components, greatly improving production efficiency. The electrochemical gas sensor PIN pin welding device and welding method of this invention, using a plate-like component as an intermediate support, improves assembly efficiency and overcomes the cumbersome problem of individual assembly. The PIN pin has a head, middle, and tail, which not only facilitates welding but also prevents damage to the PIN pin. Welding is convenient and improves the product welding success rate. The structure is simple, environmentally friendly, and suitable for batch welding.

[0032] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A PIN soldering device for an electrochemical gas sensor, characterized in that, include: A PIN pin has a head, a middle section, and a tail section, wherein the outer diameter of the middle section is set to be larger than the outer diameters of the head and the tail section. A plate-shaped component is provided with several first through holes. The inner diameter of the first through holes is set to match the head of the PIN pin and is smaller than the outer diameter of the middle part of the PIN pin. The outer diameter of the plate-shaped component matches the inner diameter of the electrochemical gas sensor housing. A welding fixture includes a support base and at least one welding unit located on the support base. The welding unit has a limiting groove and several receiving holes located on the bottom surface of the limiting groove. The limiting groove is used to receive the plate-shaped part. The outer diameter of the middle part of the PIN pin is larger than the inner diameter of the receiving hole, such that the tail of the PIN pin hangs in the receiving hole and the conductive wire is welded from above the first through hole to the plate-shaped part and the head of the PIN pin located in the first through hole.

2. The electrochemical gas sensor PIN soldering device according to claim 1, characterized in that, The PIN pin has a frustum-shaped center.

3. The electrochemical gas sensor PIN soldering device according to claim 1, characterized in that, A second through hole is provided in the middle region of the plate-shaped component.

4. The electrochemical gas sensor PIN soldering device according to claim 1, characterized in that, The plate-shaped component has a thickness of 1 to 5 mm, is circular in shape, and has an outer diameter of 15 to 25 mm.

5. The electrochemical gas sensor PIN soldering device according to claim 1, characterized in that, The number of the first through holes is 2 to 5; the number of the receiving holes is 2 to 5.

6. The electrochemical gas sensor PIN soldering apparatus according to claim 1, characterized in that, The height of the support base is 10 to 20 mm, the depth of the limiting groove is 0.5 to 2 mm, the inner diameter is 15 to 25 mm, the depth of the receiving hole is 3 to 8 mm, and the width is 3 to 5 mm, or the width of the receiving hole matches the tail of the PIN pin.

7. The electrochemical gas sensor PIN soldering apparatus according to claim 1, characterized in that, The welding unit is located in the central area of ​​the support, or the welding units are evenly distributed on the support.

8. The electrochemical gas sensor PIN soldering apparatus according to claim 1, characterized in that, Conductive welding points can be set on both the front and back sides of the first through hole.

9. A method for welding a PIN pin to a conductive wire in an electrochemical gas sensor, characterized in that, The method of soldering PIN pins to conductive wires using the soldering apparatus according to any one of claims 1 to 8, wherein the method comprises: Step (1) Place the welding fixture on a horizontal operating table, and vertically place the PIN pins in the receiving holes one by one, with the heads facing upwards; Step (2) Place the plate into the limiting groove and make the first through hole pass through the head of the PIN pin; Step (3) Place a conductive wire at the head of the PIN pin; Step (4) Solder the head of the PIN pin to the conductive wire; Step (5) Remove the welded plate.

10. The welding method according to claim 9, characterized in that, In step (4), the head of the PIN pin and the conductive wire are soldered together using a soldering iron; or, solder paste is applied and baked to solidify the shape.

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