High-efficiency high-precision welding device for radio frequency low-pass filter

Abstract

The utility model discloses a kind of high-efficiency high-precision welding devices for radio frequency low-pass filter, including bottom plate, rotary protractor, welding disc, pressing positioning device, heating box and hot air gun, heating box and rotary protractor are respectively installed on bottom plate, heater is equipped in heating box, welding disc is installed on rotary protractor by disc support column, part of welding disc is located in heating box, another part is placed in heating box outside, the position of the upper surface of welding disc close to edge is equipped with multiple workpiece sink, multiple pressing positioning device are respectively installed on welding disc and correspond one-to-one with multiple workpiece sink, hot air gun is installed on bottom plate by gun rest and located in heating box outside and close to welding disc.The utility model can realize the accurate rotation angle control of multiple workpieces, i.e. the radio frequency low-pass filter to be welded and processed, and realize mechanical positioning by preheating and to hot air gun, finally realize the purpose of improving welding control precision and welding quality.

Description

Technical Field

[0001] This utility model relates to a welding device for filters, and more particularly to a high-efficiency and high-precision welding device for radio frequency low-pass filters. Background Technology

[0002] Radio frequency low-pass filters, also known as feedthrough filters, are a key electromagnetic compatibility (EMC) component. They are mainly used to suppress high-frequency electromagnetic interference (EMI) and radio frequency interference (RFI) to ensure the purity of power, signal, or data transmission lines in electronic devices. Their core function is to improve the stability and reliability of electronic systems in complex electromagnetic environments by blocking noise signals and retaining effective signals. They are widely used in high-precision and high-sensitivity electronic devices.

[0003] Soldering technology is a core step in the manufacturing process of RF low-pass filters, directly affecting the product's reliability, electrical performance, and long-term stability. While traditional soldering techniques are mature, their limitations are gradually becoming apparent under the pressure of higher frequency, miniaturization, and higher reliability requirements. In the soldering process of RF low-pass filters, two traditional methods are typically used: soldering iron soldering and hot air soldering. Due to human factors, a series of significant technical defects often occur, which can be summarized in the following two aspects:

[0004] 1. Low welding control precision and poor welding quality: Manually adjusting the hot air gun temperature (usually ±30℃ error) can easily lead to overheating and damage to sensitive components (such as BGA chips, MLCC capacitors) or PCB substrate (FR-4 layered); or insufficient heating can lead to poor solder wetting, resulting in cold solder joints (contact resistance increases by more than 50%); or deviation in the distance / angle between the hot air gun nozzle and the solder joint can lead to local overheating or the formation of cold areas, such as incomplete liquefaction of some areas of the solder ring, forming a "pillow effect" (void inside the solder joint); in addition, there are defects such as bridging, solder ball spatter, solder joint voids, and large fluctuations in welding yield.

[0005] 2. Low efficiency and high cost: Manual welding of a single weld point takes about 10-30 seconds (including positioning, heating and cleaning), which is inefficient and has high labor costs. Utility Model Content

[0006] The purpose of this invention is to provide a high-efficiency and high-precision welding device for radio frequency low-pass filters in order to solve the above-mentioned problems.

[0007] This utility model achieves the above objectives through the following technical solutions:

[0008] A high-efficiency, high-precision welding device for radio frequency low-pass filters includes a base plate, a rotary indexer, a welding disc, a clamping and positioning device, a heating chamber, and a hot air gun. The heating chamber and the rotary indexer are respectively mounted on the base plate. A heater is provided inside the heating chamber. The horizontally oriented welding disc is mounted on the rotary indexer via a vertical disc support column. A portion of the welding disc is located inside the heating chamber, and another portion is located outside the heating chamber through a notch in the chamber wall. The welding disc has multiple workpiece grooves evenly distributed along its circumference near its edge. Multiple clamping and positioning devices are respectively mounted on the welding disc and correspond one-to-one with the multiple workpiece grooves. The hot air gun is mounted on the base plate via a gun holder and is located outside the heating chamber and close to the welding disc. The aforementioned rotary indexing instrument is a conventional device in the prior art. It uses a worm gear to drive a worm wheel, utilizing its high reduction ratio (such as 1:40 or 1:100) to achieve precise control of minute angles. For example, for every revolution of the worm gear, the worm wheel rotates only 1 / 40 of a revolution (corresponding to 9°). The interval between each station of the welding disc is 45 degrees. If it is necessary to adjust to 9° per revolution, it is necessary to rotate 5 revolutions. The engagement method between the indexing disc and the positioning pin of the rotary indexing instrument is as follows: During manual indexing, the welding disc is rotated to the preset hole position on the indexing disc, and the positioning pin is inserted to lock the required angle (such as 40 holes corresponding to 9° per hole).

[0009] Preferably, to achieve a more reliable clamping and positioning function for the workpiece and to facilitate processing and assembly, each clamping and positioning device includes a positioning post, an inverted "L"-shaped pressure seat, an elastic pressure post, a compression spring, and a pressure rod. The vertical positioning posts are respectively installed on the welding disc and located next to the corresponding workpiece recess. The horizontal bar of the inverted "L"-shaped pressure seat is connected to the upper end of the positioning post and can rotate laterally. The upper end of the vertical elastic pressure post is connected to the vertical bar of the inverted "L"-shaped pressure seat and can move vertically. The compression spring is fitted outside the elastic pressure post and gives the elastic pressure post a downward elastic force. The upper end of the vertical pressure rod is connected to the lower end of the elastic pressure post, and the lower end of the pressure rod is located directly above the corresponding workpiece recess.

[0010] Preferably, to facilitate the lateral free rotation function of the inverted "L" shaped pressure seat and to facilitate processing and assembly, the outer diameter of the upper end of the positioning column is reduced to form a positioning column connecting section. The positioning column connecting section is provided with a vertical screw hole with an open upper end. The horizontal bar of the inverted "L" shaped pressure seat has a vertical through hole at its suspended end. Bearing grooves are provided on the upper and lower sides of the horizontal bar of the inverted "L" shaped pressure seat. The vertical through hole passes through the center of the bottom of the two bearing grooves. The two bearings are placed in the two bearing grooves respectively. The lower bearing is fitted outside the upper end of the positioning column connecting section. The screw of the connecting bolt passes through the center through hole of the upper bearing and the vertical through hole from top to bottom and then connects to the screw hole of the positioning column connecting section.

[0011] Preferably, in order to achieve a more reliable connection function, a spring washer and a flat washer are installed between the nut of the connecting bolt and the upper bearing, which are fitted outside the thread of the connecting bolt.

[0012] Preferably, to facilitate the elastic clamping function of the workpiece and for ease of processing and assembly, the vertical rod of the inverted "L"-shaped pressure seat has a horizontal through hole with a vertical length greater than its horizontal width and a vertical hole with an opening at the lower end. The horizontal through hole and the vertical hole intersect. The upper end of the elastic pressure column is located in the vertical hole of the pressure seat. A horizontal pin passes through the horizontal through hole of the pressure seat and the horizontal through hole at the upper end of the elastic pressure column. Both ends of the pin are fitted with retaining rings with an outer diameter greater than the horizontal width of the horizontal through hole of the pressure seat. The lower end of the elastic pressure column has an increased outer diameter to form a pressure column blocking part. The upper end of the compression spring contacts the lower end of the vertical rod of the inverted "L"-shaped pressure seat, and the lower end contacts the upper end of the pressure column blocking part. The upper ends of the multiple pressure rods located directly above the corresponding workpiece groove are respectively connected to the lower end of the pressure column blocking part.

[0013] Preferably, in order to reliably limit the lateral rotational movement of the vertical rod of the inverted "L"-shaped pressure seat, the clamping and positioning device further includes "L"-shaped limiting posts. The multiple limiting posts are respectively installed next to the multiple workpiece recesses through waist-shaped holes and screws on their horizontal rods and are used to limit the lateral rotational movement of the vertical rod of the adjacent inverted "L"-shaped pressure seat.

[0014] Preferably, to facilitate multi-angle adjustment of the hot air gun, the gun holder includes a gun holder base, a gun holder rod, a first rotating clamp, a second rotating clamp, and a connecting crossbar. The lower end of the vertical gun holder rod is mounted on the welding disc via the gun holder base. One end of the first rotating clamp is fitted outside the gun holder rod, and the other end is fitted outside one end of the connecting crossbar. One end of the second rotating clamp is fitted outside the other end of the connecting crossbar, and the other end is fitted outside the hot air gun.

[0015] Preferably, in order to achieve a more uniform heating function, the heater is an infrared heating tube, and two horizontal infrared heating tubes are respectively installed on the inner wall of the heating box.

[0016] Preferably, to facilitate processing and assembly and to achieve a reliable connection between the welding disc and the rotary indexing instrument, a connecting disc is provided at the upper end of the disc support column. The connecting disc has an upwardly protruding central protrusion at its center. The connecting disc has multiple upwardly protruding peripheral protrusions evenly distributed along the circumference outside the central protrusion. The welding disc has a central through hole at its center. The welding disc has multiple peripheral through holes evenly distributed along the circumference outside the central through hole. The central protrusion passes through the central through hole, and the multiple peripheral protrusions pass through the multiple peripheral through holes.

[0017] Preferably, to facilitate the installation of the heating box, the heating box is mounted on the base plate by two vertical heating box support columns.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention connects a rotary indexing instrument to a welding disc, and installs multiple clamping and positioning devices evenly distributed along the circumference on the welding disc. This enables precise rotation angle control of multiple workpieces, namely radio frequency low-pass filters to be welded. The workpieces are preheated in a heating chamber, and reliable mechanical positioning is achieved by mounting a hot air gun on a gun holder. Ultimately, this improves welding control accuracy and welding quality, increases welding efficiency, and reduces labor costs. More specific advantages are as follows:

[0020] 1. Preheating Guarantee: The ceramic dielectric or thin film structure inside the RF low-pass filter is extremely sensitive to temperature. Intense heating may change its dielectric constant or capacitance value, thereby affecting the filtering performance. Preheating can effectively reduce the interference of thermal shock on electrical characteristics, effectively avoid the rapid loss of heat during the preheating process, significantly improve the temperature rise rate, and ensure that the expected preheating temperature is reached, thereby avoiding chip problems caused by a sharp increase in temperature during the soldering process.

[0021] 2. Ensure consistent hot air soldering: A dedicated tooling, namely a gun holder, is used to mechanically position and install the hot air soldering gun, accurately determining the optimal soldering angle and distance. The multi-directional adjustment function of the gun holder ensures reliable positioning of the hot air gun, guaranteeing that the hot air soldering process of each subsequent product is carried out at this angle, distance, and set time, thereby ensuring the consistency and stability of soldering.

[0022] 3. Tooling versatility and process merging: The welding disc can be used as a welding fixture for RF low-pass filters of the same diameter but different models, which not only effectively reduces the cost of processing tooling, but also significantly reduces the time spent on frequent mold and fixture changes during production; the three processes of preheating, blow welding, and soldering are combined into one, achieving the effect of one operation being equivalent to three processes, greatly improving production efficiency and cycle time. For mass-produced products, this ensures both quality improvement and increased output.

[0023] 4. Economic rationality: In workshops where electricity is inconvenient, the semi-automatic fixture of this utility model replaces electric dependence with mechanical drive, improves quality through standardized operation, flexibly adapts to production needs, and reduces safety risks, becoming an efficient solution to break through production capacity bottlenecks. It is economical, easy to maintain, and adaptable. Attached Figure Description

[0024] Figure 1 This is a perspective view of the high-efficiency and high-precision welding device for radio frequency low-pass filters described in this utility model, and the figure shows a radio frequency low-pass filter;

[0025] Figure 2 This is a perspective view of the heating box of the high-efficiency and high-precision welding device for radio frequency low-pass filters described in this utility model;

[0026] Figure 3 This is a perspective view of the disc support column of the high-efficiency and high-precision welding device for radio frequency low-pass filters described in this utility model;

[0027] Figure 4 This is a perspective view of the clamping and positioning device of the high-efficiency and high-precision welding device for radio frequency low-pass filters described in this utility model;

[0028] Figure 5 This is a perspective view of the gun holder of the high-efficiency, high-precision welding device for radio frequency low-pass filters described in this utility model. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] like Figures 1-5As shown, the high-efficiency and high-precision welding device for radio frequency low-pass filters of this utility model includes a base plate 1, a rotary indexer 9, a welding disc 7, a clamping and positioning device 6, a heating box 3, and a hot air gun 11. The heating box 3 and the rotary indexer 9 are respectively installed on the base plate 1. The heating box 3 is equipped with a heater (refer to the infrared heating tube 5 below). The horizontal welding disc 7 is installed on the rotary indexer 9 through a vertical disc support column 8. A part of the welding disc 7 is located inside the heating box 3, and another part is placed outside the heating box 3 through a notch on the box wall. The upper part of the welding disc 7 is provided with a plurality of workpiece grooves evenly distributed along the circumference near the edge (not marked in the figure, the same position as the workpiece 10). A plurality of clamping and positioning devices 6 are respectively installed on the welding disc 7 and correspond one-to-one with the plurality of workpiece grooves. The hot air gun 11 is installed on the base plate 1 through a gun holder and is located outside the heating box 3 and close to the welding disc 7.

[0031] like Figures 1-5 As shown, this utility model also discloses the following more optimized specific structures:

[0032] To achieve a more reliable clamping and positioning function for the workpiece 10 (i.e., the RF low-pass filter to be welded) and to facilitate processing and assembly, each clamping and positioning device 6 includes a positioning post 64, an inverted "L"-shaped pressure seat 62, an elastic pressure post 65, a compression spring 67, and a pressure rod 68. The vertical positioning posts 64 are respectively installed on the welding disc 7 and are located next to the corresponding workpiece sink. The horizontal bar of the inverted "L"-shaped pressure seat 62 is connected to the upper end of the positioning post 64 and can rotate laterally. The upper end of the vertical elastic pressure post 65 is connected to the vertical bar of the inverted "L"-shaped pressure seat 62 and can move vertically. The compression spring 67 is fitted around the elastic pressure post 65 and gives the elastic pressure post 65 a downward elastic force. The upper end of the vertical pressure rod 68 is connected to the lower end of the elastic pressure post 65, and the lower end of the pressure rod 68 is located directly above the corresponding workpiece sink.

[0033] To facilitate the lateral free rotation of the inverted "L"-shaped pressure seat 62 and to simplify processing and assembly, the outer diameter of the upper end of the positioning post 64 is reduced to form a positioning post connecting section (not marked in the figure). The positioning post connecting section has a vertical screw hole with an open upper end (not visible in the figure). The horizontal bar of the inverted "L"-shaped pressure seat 62 has a vertical through hole (not visible in the figure). The upper and lower ends of the horizontal bar of the inverted "L"-shaped pressure seat 62 are respectively provided with bearing grooves (not marked in the figure). The vertical through hole passes through the center of the bottom of the two bearing grooves. The two bearings 61 are respectively placed in the two bearing grooves. The lower bearing 61 is fitted outside the upper end of the positioning post connecting section. The screw of the connecting bolt 60 passes through the center through hole of the upper bearing 61 and the vertical through hole from top to bottom and then connects to the screw hole of the positioning post connecting section.

[0034] To achieve a more reliable connection, a spring washer (not marked in the figure) and a flat washer (not marked in the figure) are installed between the nut of the connecting bolt 60 and the upper bearing 61, which are fitted outside the thread of the connecting bolt 60.

[0035] To facilitate the elastic clamping function of the workpiece and for easy processing and assembly, the vertical rod of the inverted "L"-shaped pressure seat 62 is provided with a pressure seat transverse through hole 63 with a vertical length greater than the transverse width and a pressure seat vertical hole (not visible in the figure) with an opening at the lower end. The pressure seat transverse through hole 63 intersects with the pressure seat vertical hole. The upper end of the elastic pressure column 65 is located in the pressure seat vertical hole. The transverse pin 66 passes through the pressure seat transverse through hole 63 and the transverse through hole at the upper end of the elastic pressure column 65. Both ends of the pin 66 are respectively fitted with retaining rings (not marked in the figure) with an outer diameter greater than the transverse width of the pressure seat transverse through hole 63. The lower end of the elastic pressure column 65 has an increased outer diameter to form a pressure column blocking part (not marked in the figure). The upper end of the compression spring 67 contacts the lower end of the vertical rod of the inverted "L"-shaped pressure seat 62, and the lower end contacts the upper end of the pressure column blocking part. The upper ends of the multiple pressure rods 68 located directly above the corresponding workpiece groove are respectively connected to the lower end of the pressure column blocking part.

[0036] In order to reliably limit the lateral rotation of the vertical rod of the inverted "L" shaped pressure seat 62, the clamping and positioning device 6 also includes an "L" shaped limiting post 69. Multiple limiting posts 69 are respectively installed next to multiple workpiece sinks through waist-shaped holes and screws on their horizontal rods and are used to limit the lateral rotation of the vertical rod of the adjacent inverted "L" shaped pressure seat 62.

[0037] To facilitate the multi-angle adjustment function of the hot air gun 11, the gun frame includes a gun frame base 15, a gun frame rod 14, a first rotating clamp 13, a second rotating clamp 12, and a connecting crossbar 16. The lower end of the vertical gun frame rod 14 is mounted on the welding disc 7 through the gun frame base 15. One end of the first rotating clamp 13 is fitted outside the gun frame rod 14, and the other end is fitted outside one end of the connecting crossbar 16. One end of the second rotating clamp 12 is fitted outside the other end of the connecting crossbar 16, and the other end is fitted outside the hot air gun 11.

[0038] To achieve more uniform heating, the heater is an infrared heating tube 5, with two horizontal infrared heating tubes 5 respectively installed on the inner wall of the heating box 3.

[0039] To facilitate processing and assembly and to achieve a reliable connection between the welding disc 7 and the rotary indexing instrument 9, a connecting disc 83 is provided at the upper end of the disc support column 8. A central protruding post 81 is provided at the center of the connecting disc 83. Multiple external protruding posts 82 are provided on the connecting disc 83 outside the central protruding post 81, evenly distributed along the circumference. A central through hole (not marked in the figure) is provided at the center of the welding disc 83. Multiple external through holes (not marked in the figure) are provided on the welding disc 7 outside the central through hole, evenly distributed along the circumference. The central protruding post 81 passes through the central through hole, and the multiple external protruding posts 82 pass through the multiple external through holes.

[0040] To facilitate the installation of the heating box 3, the heating box 3 is mounted on the base plate 1 via two vertical heating box support columns 4.

[0041] Figure 1 The image also shows handles 2 located at both ends of the base plate 1, which are conventional adaptive structures.

[0042] like Figures 1-5 As shown, the working principle of the high-efficiency and high-precision welding device for radio frequency low-pass filters described in this utility model is as follows:

[0043] First, select and install the welding disk 7: Select the appropriate welding disk 7 according to the different diameters of the RF low-pass filter to be welded, i.e., the workpiece 10, to ensure that RF low-pass filters with the same outer diameter can use the same welding disk 7.

[0044] Then preheat: Before working, the infrared heating tube 5 needs to be started to preheat the heating box 3; theoretically, the time required to reach 160℃ is as follows: After the preheating time is reached, the temperature is detected by a thermometer to ensure that the expected temperature is reached, and the working time of the infrared heating tube 5 can be controlled by the temperature sensor and the constant temperature control chip to maintain a constant preheating temperature.

[0045] Assemble workpiece 10: After preheating, the operator inserts the lead wire of workpiece 10 downwards into the workpiece sink. The workpiece 10 is then pressed and positioned by the pressure rod 68 of the clamping and positioning device 6, and the position of the limiting post 69 is fixed. Next, the rotary indexing instrument 9 is rotated, causing the welding disc 7 to rotate by the corresponding angle, and then the next workpiece 10 is installed until the first workpiece 10 enters the heating box 3, and its entry time is recorded. The above operation is continued. When the first workpiece 10 entering the heating box 3 reaches the preheating temperature and rotates out of the heating box 3, its exit time is recorded. This time is divided by three (because it needs to rotate three times to exit the heating box 3) to obtain the assembly cycle time.

[0046] Hot air welding: Fix the hot air gun 11 on the gun holder. When the first workpiece 10 comes out of the heating box 3 during the first rotation, perform hot air welding on it. Adjust the angle and height of the hot air gun 11 to achieve the best effect and then fix it. Record the hot air welding time. After the hot air welding is completed, rotate the rotary indexing instrument 9 to the next station for cooling and inspection.

[0047] Soldering: After the workpiece 10 has finished blowing and cooled, it returns to the work position facing the operator and is soldered with a soldering iron. At this time, the operator releases the clamping and positioning device 6, observes the blowing effect, and then performs manual soldering and other steps. After the soldering is completed, the workpiece 10 is taken out, the assembly steps are repeated, and the operation time is recorded.

[0048] Cycle time calculation: The entire process includes assembly cycle time, hot air blowing time, and manual soldering time. Using the longest cycle time as the cycle time enables semi-automatic uninterrupted mass production.

[0049] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A high-efficiency, high-precision welding device for radio frequency low-pass filters, comprising a base plate, characterized in that: It also includes a rotary indexing instrument, a welding disc, a clamping and positioning device, a heating box, and a hot air gun. The heating box and the rotary indexing instrument are respectively mounted on the base plate. The heating box is equipped with a heater. The horizontal welding disc is mounted on the rotary indexing instrument through a vertical disc support column. A part of the welding disc is located inside the heating box, and another part is placed outside the heating box through a notch in the box wall. The welding disc has multiple workpiece grooves evenly distributed along the circumference near the edge. Multiple clamping and positioning devices are respectively mounted on the welding disc and correspond one-to-one with the multiple workpiece grooves. The hot air gun is mounted on the base plate through a gun holder and is located outside the heating box and close to the welding disc.

2. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to claim 1, characterized in that: Each of the clamping and positioning devices includes a positioning post, an inverted "L"-shaped pressure seat, an elastic pressure post, a compression spring, and a pressure rod. The vertical positioning posts are respectively installed on the welding disc and located next to the corresponding workpiece recess. The horizontal bar of the inverted "L"-shaped pressure seat is connected to the upper end of the positioning post and can rotate laterally. The upper end of the vertical elastic pressure post is connected to the vertical bar of the inverted "L"-shaped pressure seat and can move vertically. The compression spring is fitted outside the elastic pressure post and gives the elastic pressure post a downward elastic force. The upper end of the vertical pressure rod is connected to the lower end of the elastic pressure post, and the lower end of the pressure rod is located directly above the corresponding workpiece recess.

3. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to claim 2, characterized in that: The upper outer diameter of the positioning post is reduced to form a positioning post connecting section. The positioning post connecting section is provided with a vertical screw hole with an open upper end. The horizontal bar of the inverted "L" shaped pressure seat has a vertical through hole at its suspended end. The upper and lower ends of the horizontal bar of the inverted "L" shaped pressure seat are respectively provided with bearing grooves. The vertical through hole passes through the center of the bottom of the two bearing grooves. The two bearings are respectively placed in the two bearing grooves. The lower bearing is fitted outside the upper end of the positioning post connecting section. The screw of the connecting bolt passes through the center through hole of the upper bearing and the vertical through hole from top to bottom and then connects to the screw hole of the positioning post connecting section.

4. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to claim 3, characterized in that: A spring washer and a flat washer are installed between the nut of the connecting bolt and the upper bearing.

5. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to claim 2, characterized in that: The vertical rod of the inverted "L"-shaped pressure base has a horizontal through hole with a vertical length greater than its horizontal width and a vertical hole with an opening at the lower end. The horizontal through hole and the vertical hole intersect. The upper end of the elastic pressure column is located in the vertical hole of the pressure base. A horizontal pin passes through the horizontal through hole of the pressure base and the horizontal through hole at the upper end of the elastic pressure column. Both ends of the pin are fitted with retaining rings with an outer diameter greater than the horizontal width of the horizontal through hole of the pressure base. The lower end of the elastic pressure column has an increased outer diameter to form a pressure column blocking part. The upper end of the compression spring contacts the lower end of the vertical rod of the inverted "L"-shaped pressure base, and the lower end contacts the upper end of the pressure column blocking part. The upper ends of the multiple pressure rods located directly above the corresponding workpiece groove are respectively connected to the lower end of the pressure column blocking part.

6. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to any one of claims 2-5, characterized in that: The clamping and positioning device also includes "L"-shaped limiting posts. The multiple limiting posts are respectively installed next to the multiple workpiece sinks through waist-shaped holes and screws on their crossbars and are used to limit the lateral rotational movement of the vertical rod of the adjacent inverted "L"-shaped pressure seat.

7. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to any one of claims 1-5, characterized in that: The gun mount includes a gun mount base, a gun mount rod, a first rotating clamp, a second rotating clamp, and a connecting crossbar. The lower end of the vertical gun mount rod is mounted on the welding disc via the gun mount base. One end of the first rotating clamp is fitted outside the gun mount rod, and the other end is fitted outside one end of the connecting crossbar. One end of the second rotating clamp is fitted outside the other end of the connecting crossbar, and the other end is fitted outside the hot air gun.

8. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to any one of claims 1-5, characterized in that: The heater is an infrared heating tube, and two horizontal infrared heating tubes are respectively installed on the inner wall of the heating box.

9. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to any one of claims 1-5, characterized in that: The upper end of the disc support column is provided with a connecting disc. The center of the connecting disc is provided with an upwardly protruding central protrusion. The connecting disc is provided with a plurality of upwardly protruding peripheral protrusions evenly distributed along the circumference outside the central protrusion. The center of the welding disc is provided with a central through hole. The welding disc is provided with a plurality of peripheral through holes evenly distributed along the circumference outside the central through hole. The central protrusion passes through the central through hole, and the plurality of peripheral protrusions pass through the plurality of peripheral through holes.

10. The high-efficiency, high-precision welding apparatus for radio frequency low-pass filters according to any one of claims 1-5, characterized in that: The heating box is mounted on the base plate by two vertical heating box support columns.

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