Combined special-shaped section annular protective window for automatic filter core welding

Abstract

The application discloses a combined special-shaped section annular protective window for automatic welding of filter elements, which comprises a positioning device, an inner protective device and an outer protective device. When the filter element is inserted into the inner profile of the inner protective device, one end surface of the pressing plate or the positioning pressing plate and the axial end surface of the outer circular surface of the inner protective device, the inner wall of the inner circular hole of the outer protective device, the sealing end cover and the connecting ring form a special-shaped section annular protective cavity, and the cooperation gap between the outer circle of the pressing plate or the positioning pressing plate and the inner circular hole of the outer protective device and the cooperation gap between the outer circular surface of the inner protective device and the inner circular hole of the outer protective device form air flow guiding and heat dissipation channels. The annular protective window utilizes the air charging and air flow guiding characteristics to achieve the effects of isolating the air at the weld of the filter element, guiding the trend of the welding heat affected zone and protecting the filter screen, and the surface quality and construction period of the stainless steel filter element after welding meet the requirements.

Description

Technical Field

[0001] This invention belongs to the field of mechanical processing technology, and particularly relates to the manufacturing of filter elements for the main AC power subsystem of an aircraft combined transmission power generation device, especially a sealing end cap welding protection device for a stainless steel filter element used in an automatic welding machine. Background Technology

[0002] With the advancement of technology and increasingly fierce market competition, more and more OEMs are adopting a dual-flow production model. For the stainless steel filter products produced, while ensuring the internal quality of the stainless steel filter, the appearance quality and production cycle directly affect its competitiveness in the market.

[0003] like Figure 1 As shown, this is a newly developed stainless steel filter element. This filter element is an accessory for the main AC power subsystem of an aircraft's combined transmission and generator unit, used to filter the lubricating oil entering the system to ensure the required cleanliness of the lubricating oil. The stainless steel filter element is a fully welded product, such as... Figure 1 As shown, it includes sealing end caps 401 at both ends and a filter element assembly ( Figure 1 The area marked with double dots (consisting of the middle filter screen 402 and the connecting rings at both ends 403) produces oxide scale on the welded area and the surrounding surface during welding, forming a black or similar golden yellow color. Such stainless steel filter elements must undergo post-processing. However, post-processing not only fails to completely remove the oxide scale but also increases the risk of dents and bumps. As a result, the stainless steel filter elements cannot fully meet the appearance acceptance requirements and the delivery cycle of the stainless steel filter elements is delayed.

[0004] Compared to similar stainless steel filter cartridges, its features are:

[0005] 1. The entire surface of the stainless steel filter element must be silver-white or the natural color of metal;

[0006] 2. The entire surface of the stainless steel filter element must be free of dents and scratches.

[0007] 3. The entire stainless steel filter element will be delivered within one month.

[0008] The above technical requirements are currently the highest among stainless steel filter element products, and cannot be guaranteed by conventional stainless steel filter element welding methods and post-processing methods alone.

[0009] Therefore, during the early product development process, oxide scale was generated at and near the welding points. Grinding and pickling were used to remove the oxide scale. However, this process not only resulted in incomplete removal of the oxide scale, but also increased the risk of damage during transportation and lengthened the processing time. On average, each stainless steel filter element took more than 30 minutes to transport and pickle. In addition, a new quality problem of uneven color (color difference) appeared on the filter screen. Summary of the Invention

[0010] In view of the problems existing in the background technology, the present invention aims to provide a combined irregular cross-section annular protective window for automatic welding of filter elements, so as to achieve the effects of isolating the air at the weld seam of the filter element, guiding the direction of the welding heat-affected zone, and protecting the filter screen, so as to achieve the goal of making the stainless steel filter element surface silver-white or metallic, free from dents and bumps, and able to be delivered within the required time.

[0011] To achieve the above objectives, the present invention adopts the following solution:

[0012] A combined irregular cross-section annular protective window for automatic welding of filter elements, wherein the filter element mainly consists of a sealing end cap, a filter screen, and a connecting ring, and the annular protective window includes,

[0013] A positioning device, comprising at least a pressure plate and a positioning pressure plate with equal outer diameters, wherein the pressure plate and the positioning pressure plate are coaxially assembled.

[0014] The inner protective device includes at least one outer circular surface, the diameter of which is equal to the diameter of the pressure plate and the positioning pressure plate. The inner surface of the outer circular surface is an inner surface that is consistent with the outer surface of the filter screen. The two axial end faces of the outer circular surface are both annular planes.

[0015] An external protective device, comprising at least an inner circular hole, a gas nozzle, a welding torch insertion tube, and an observation window, wherein the diameter of the inner circular hole is equal to the diameter of the outer circular surface of the inner protective device, the pressure plate, and the positioning pressure plate, and the gas nozzle and the welding torch insertion tube are connected to the inner circular hole, and the observation window penetrates the inner circular hole.

[0016] The pressure plate, positioning pressure plate, and inner protective device are inserted into the inner circular hole, with the inner protective device located between the pressure plate and the positioning pressure plate.

[0017] When the filter element is inserted into the inner surface of the inner protective device, an annular protective cavity with an irregular cross-section is formed between one end face of the pressure plate or positioning pressure plate and the axial end face of the outer circular surface of the inner protective device, the inner wall of the inner circular hole of the outer protective device, the sealing end cap, and the connecting ring. The fit clearance between the outer circle of the pressure plate or positioning pressure plate and the inner circular hole of the outer protective device, and the fit clearance between the outer circular surface of the inner protective device and the inner circular hole of the outer protective device, form an airflow guiding and heat dissipation channel, and the volume of the annular protective cavity meets the following conditions:

[0018] The protective gas from the nozzle fills the annular protective cavity in less than or equal to 2 seconds.

[0019] Furthermore, the annular protective window with a combined irregular cross-section for automatic welding of filter elements also includes,

[0020] The base mainly consists of a fixed seat and an adjusting screw. The fixed seat has a vertical plate with a through groove. The top of the vertical plate has a pin hole and a threaded through hole, wherein the threaded through hole communicates with the through groove. The threaded part of the adjusting screw is connected in the threaded through hole, and the head of the adjusting screw is located in the through groove.

[0021] The outer protective device includes a boss and guide pins. The boss is located at the lower end of the outer protective device, and two guide pins are inserted into the boss. The outer protective device is positioned on the upright plate of the base by the two guide pins.

[0022] Furthermore, the positioning device also includes,

[0023] The mandrel, the pressure plate and the positioning pressure plate are coaxially assembled on the mandrel;

[0024] The base plate has a positioning groove, one end of the mandrel is detachably connected to the positioning groove, and the base plate, the positioning groove and the mandrel are coaxial.

[0025] As an alternative, the inner protective device includes a lower cover and an upper cover, the outer surface of the lower cover and the upper cover after being spliced ​​together forms an outer circular surface, the inner surface after being spliced ​​together forms an inner shaped surface, and the axial end faces on both sides after being spliced ​​together are annular planes.

[0026] Alternatively, the lower cover is provided with a boss, and the upper cover is provided with a groove, and the lower cover and the upper cover are joined together by the boss and the groove.

[0027] As an alternative, the external protective device includes a lower protective cover and an upper protective cover, and the internal space of the lower protective cover and the upper protective cover after being spliced ​​together forms an inner circular hole.

[0028] Alternatively, the lower protective cover is provided with a boss, and the upper protective cover is provided with a groove, and the lower and upper protective covers are joined together by the boss and the groove.

[0029] Alternatively, the upper protective cover is equipped with an air nozzle, a welding torch insertion tube, and an observation window, with an arc-blocking glass movably connected to the observation window.

[0030] Alternatively, the axial end face of the lower protective cover is provided with a stop to restrict the axial sliding of the upper protective cover.

[0031] Alternatively, the end face of the pressure plate or positioning pressure plate that forms the annular protective cavity is an angled end face; the two axial ends of the outer circular surface of the inner protective device are angled end faces.

[0032] Compared with the prior art, the present invention provides a combined irregular cross-section annular protective window for automatic welding machines. Through the combination of multiple devices in the protective window, a space with a volume not exceeding 1.5 × 10⁻⁶ is formed at the welding point of the stainless steel filter element. -5 m 3The ring-shaped protective window allows the protective gas injected before welding to quickly fill the window and expel the air inside. During welding, the air at the point where the stainless steel filter element is to be welded is isolated, and the heat generated during welding is carried away by the flowing protective gas, thus effectively protecting the stainless steel filter element.

[0033] Because the protective window is small and the inflation and deflation time is extremely short, operators can begin welding immediately after assembling and adjusting the product, saving inflation time. Under this protection, the weld seam and surrounding surface of the welded product are silver-white or metallic in color, with no oxidation, meeting product appearance requirements. No post-processing is needed, avoiding various problems that may occur during post-processing, while also improving production efficiency. Furthermore, it offers the following advantages:

[0034] 1. This invention has a simple and lightweight structure, is easy to install and disassemble, and utilizes the principle of instant charging (reducing the volume of the protective window to significantly shorten the inflation time) and the principle of airflow guidance (directly introducing protective gas to cool the heat source and its vicinity, and then carrying the heat away from the protective window), thereby guiding the heat-affected zone to move outward to the protective window. It has good feasibility and practicality, improves the quality of finished products, and meets the goal of ensuring that the surface of the stainless steel filter element welded finished product is silver-white or metallic, free of scratches and dents, and can be delivered within the required time.

[0035] 2. This invention is easy to operate. Operators can master the essentials after simple training, which can effectively improve production efficiency and ensure product delivery time. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the stainless steel filter element structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the annular protective window structure with a combined irregular cross section for automatic welding of filter elements according to the present invention;

[0038] Figure 3 This is a schematic diagram of the positioning device in this invention;

[0039] Figure 4 This is a schematic diagram of the internal protection device in this invention;

[0040] Figure 5 This is a structural diagram of the external protection device in this invention;

[0041] Figure 6 This is a schematic diagram of the base in this invention:

[0042] In the diagram: 1-Outer protective device, 101-Arc-blocking glass, 102-Lower protective cover, 103-Upper protective cover, 104-Air nozzle, 105-Guide pin, 106-Stop block, 107-Screw, 2-Base, 201-Fixing seat, 202-Adjusting screw, 3-Inner protective device, 301-Lower cover, 302-Upper cover, 4-Stainless steel filter element ( Figure 2 (Double dotted line in the middle), 401-Sealed end cap, 402-Filter screen, 403-Connecting ring, 5-Equipment welding gun, 6-Positioning device, 601-Pressure plate, 602-Mandrel, 603-Positioning pressure plate, 604-Base plate, 605-Screw. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and conventional means in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0044] like Figures 2-6 As shown, the present invention provides a combined irregular cross-section annular protective window for an automatic filter element welding machine, including a positioning device 6, an inner protective device 3, an outer protective device 1, and a base 2. The positioning plate 603 and the pressure plate 601 of the positioning device correspond to the sealing end cap 401, and the inner cavity of the inner protective device 3 corresponds to the filter screen 402.

[0045] The positioning device 6 includes a pressure plate 601, a spindle 602, a positioning pressure plate 603, a base plate 604, and screws 605. The base plate 604 is provided with a positioning boss, mounting holes, and positioning grooves. The positioning boss and mounting holes are used to accurately install and fix the positioning device 6 on the turntable of the automatic welding equipment. The spindle 602 is fixedly installed in the positioning groove of the base plate 604 and fastened with screws 605. The positioning pressure plate 603 and the pressure plate 601 are respectively installed on the left and right ends of the step of the spindle 602 to ensure that the outer circles φM of the positioning pressure plate 603 and the pressure plate 601 are concentric.

[0046] To facilitate the disassembly and assembly of the stainless steel filter element, the inner protective device 3 is divided into two parts: a lower cover 301 and an upper cover 302. The upper cover 302 and the lower cover 301 are respectively provided with a boss and a groove, and their fitting clearance is no more than 0.05mm. This is used for positioning and installation of the upper cover 302 on the lower cover 301, ensuring that after installation, the middle is a cavity and the outside is a standard circle with a diameter equal to the outer circle φM of the upper pressure plate 601 and the positioning pressure plate 603 of the positioning device 6.

[0047] To facilitate the disassembly and assembly of the stainless steel filter element, the outer protective device 1 is divided into two parts: an upper protective cover 103 and a lower protective cover 102. The upper protective cover 103 and the lower protective cover 102 are respectively provided with a boss and a groove, and their fitting gap is no more than 0.05mm. This is used for positioning and installation of the upper protective cover 103 on the lower protective cover 102, ensuring that the middle is a standard round hole after installation.

[0048] To ensure that the positioning device 6, stainless steel filter element 4, and inner protective device 3 can rotate smoothly within the outer protective device 1 during welding and that the heated protective gas can be discharged, the double-sided gap between the inner diameter φM of the outer protective device 1 and the outer circle φM of the upper pressure plate 601 and positioning pressure plate 603 of the positioning device 6, and the outer circle of the inner protective device 3 is 0.8mm.

[0049] The lower protective cover 102 has a boss at its lower end, with two guide pins 105 on the boss for guiding when adjusting up and down. The upper end has a groove for installing the upper protective cover 103, and the left end has a stop block 106 for limiting the left and right installation position of the upper protective cover 103.

[0050] The upper protective cover 103 is provided with a welding torch insertion tube at the upper end for inserting and withdrawing the welding torch of the automatic welding equipment; a small hole is provided at the rear of the welding torch insertion tube, and a gas nozzle 104 is welded on for the access of protective gas; a square hole is provided at the front of the welding torch insertion tube for attaching the arc-blocking glass 101 to observe the welding process; each of the lower ends of the upper protective cover 103 is provided with a boss for installation in the groove at the upper end of the lower protective cover 102.

[0051] The lower end of the base 2 is provided with an oblong hole to facilitate the fixing of the base 2 on the horizontal worktable of the automatic welding equipment. The upper end of the fixed seat 201 is provided with a guide pin hole and an adjusting screw 202. The adjusting screw 202 is used to adjust the vertical position of the outer protective device 1. The guide pin of the outer protective device 1 is inserted into the guide pin hole at the upper end of the fixed seat 201 to ensure the guidance of the outer protective device 1 when adjusting vertically.

[0052] The combined irregular cross-section annular protective window is formed by combining the positioning pressure plate 603 and the angled end face of the pressure plate 601 of the positioning device 6, the angled end face of the inner protective device 3, the end connecting ring 403 of the filter element assembly, the sealing end cap 401, and the inner hole of the outer protective device 1 to form an irregular cross-section. Figure 2 The annular protective window cavity (the cross-section at the welding torch).

[0053] The protective principle and characteristics of the ring-shaped protective window:

[0054] 1. Instant Charging: The combined irregular cross-section annular protective window is composed of the positioning pressure plate 603 and the angled end face of the pressure plate 601 of the positioning device 6, the angled end face of the inner protective device 3, the end connecting ring 403 of the filter element assembly, the sealing end cap 401, and part of the inner hole of the outer protective device 1. The entire cavity volume is reduced to 1.5×10-5 m 3 Fill with protective gas at a flow rate of 20 L / min, and the filling time should not exceed 2 seconds.

[0055] 2. Airflow guidance: Protective gas is injected into the annular protective window cavity with an irregular cross-section through the gas nozzle 104. After filling, it is discharged from the gap between the outer circle of the positioning pressure plate 603 or pressure plate 601 and the inner circle of the outer protective device 1, and the gap between the outer circle of the inner protective device 3 and the inner circle of the outer protective device 1. In this way, the flowing protective gas squeezes out the air in the product welding area, ensuring that the window is full of protective gas. At the same time as the protective gas flows, the heat generated during the welding process is carried away.

[0056] Positioning device 6 (e.g.) Figure 3 The assembly includes a pressure plate 601, a spindle 602, a positioning pressure plate 603, a base plate 604, and screws 605. The spindle 602 is assembled in the positioning groove of the base plate 604 and fixed with screws. The pressure plate 601 and the positioning pressure plate 603 have a through hole in between, which is installed on the spindle 602 and maintains an H7 / f6 fit with the spindle 602. After assembly, the outer circles φM of the pressure plate 601 and the positioning pressure plate 603 are equal and coaxial, and coaxial with the positioning groove of the base plate 604, with a coaxiality not greater than φ0.2.

[0057] Internal protection device 3 (such as) Figure 4 It includes a lower cover 301 and an upper cover 302. The upper cover 302 and the lower cover 301 are respectively provided with a boss and a groove, and their fitting clearance is no more than 0.05mm. They are used for positioning and installation of the upper cover 302 on the lower cover 301, ensuring that after installation, the middle is a waist-shaped cavity and the outside is a standard circle with a diameter equal to the outer circle φM of the upper pressure plate 601 and the positioning pressure plate 603 of the positioning device 6.

[0058] External protection device 1 (e.g.) Figure 5 The system includes an arc-blocking glass 101, a lower protective cover 102, an upper protective cover 103, an air nozzle 104, a guide pin 105, a stop block 106, and screws 107. The upper protective cover 103 and the lower protective cover 102 are respectively provided with a boss and a groove, with a fitting clearance of no more than 0.05mm. This is used for positioning and installing the upper protective cover 103 on the lower protective cover 102, ensuring that the center is a standard circular hole after installation. The diameter of the circular hole and the bilateral clearance between the outer circle φM of the upper pressure plate 601 and the positioning pressure plate 603 of the positioning device 6, and the outer circle of the inner protective device 3, are no more than 0.8mm.

[0059] The lower protective cover 102 has a boss at its lower end, and two guide pins 105 are provided on the boss for guiding when adjusting up and down. The upper end has a groove for installing the upper protective cover 103.

[0060] The upper protective cover 103 has a welding torch insertion tube at its upper end for inserting and withdrawing the welding torch 5 of the automatic welding equipment; a small hole is provided at the rear of the welding torch insertion tube, and a gas nozzle 104 is welded on for the introduction of protective gas; a square hole is provided at the front of the welding torch insertion tube for attaching the arc-blocking glass 101 to observe the welding process and make adjustments as needed; each of the lower ends of the upper protective cover 103 has a boss for installation in the groove at the upper end of the lower protective cover 102; a stop block 106 is provided at the left end of the lower protective cover 102 to limit the left and right installation position of the upper protective cover 103. Figure 5 (The axis is left and right in the middle).

[0061] Base 2 (e.g.) Figure 6 The device includes a fixed base 201 and an adjusting screw 202. The fixed base 201 has a waist-shaped hole at its lower end for easy fixing to the horizontal worktable of the automatic welding equipment. The upper end has a guide pin hole and an adjusting screw 202. The adjusting screw 202 is used to adjust the upper and lower positions of the outer protective device 1. The guide pin 105 of the outer protective device 1 is inserted into the guide pin hole at the upper end of the fixed base 201 to ensure the guidance of the outer protective device 1 during the upper and lower adjustment.

[0062] The combined irregular cross-section annular protective window is formed by combining the positioning pressure plate 603 of the positioning device 6, the beveled end face of the pressure plate 601, the beveled end face of the outer circle of the inner protective cover 3, the end connecting ring 403 of the filter element assembly, the sealing end cap 401, and the inner circle hole of the outer protective device 1. Figure 2 The annular protective window (at the welding torch section) is used. During welding, the shielding gas is injected into the annular protective window with an irregular cross-section through the gas nozzle 104. After it is full, it is discharged from the positioning pressure plate 603, the gap between the outer circle of the pressure plate 601 and the inner circle of the outer protective device 1, and the gap between the outer circle of the inner protective device 3 and the inner circle of the outer protective device 1. In this way, the flowing shielding gas squeezes out the air in the welding area of ​​the product, ensuring that the window is full of shielding gas, and at the same time, it carries away the heat generated during the welding process.

[0063] How to use:

[0064] 1. Install and fix the positioning device 6 on the turntable of the automatic welding equipment and fix the base 2 on the horizontal worktable of the automatic welding equipment. Adjust the position of the outer protective device 1 to ensure that the positioning device 6 can rotate in the inner hole φM of the outer protective device 1 without jamming. Connect the outer protective air pipe to the air nozzle 104 of the outer protective device 1.

[0065] 2. Remove the upper protective cover 103 of the outer protective device 1 and the pressure plate 601 of the positioning device 6.

[0066] 3. First, place the sealing end cap 401 onto the spindle 602 of the positioning device 6, with the M-side of the sealing end cap 401 tightly against the angled end face of the positioning pressure plate 603; then, wrap the filter screen 402 (between the two connecting rings 403) of the filter element assembly with the inner protective device 3, and install it onto the spindle 602 of the positioning device 6, aligning one end with and tightly against the opening of the already positioned sealing end cap 401; next, install the other sealing end cap 401 onto the spindle 602 of the positioning device 6, aligning the opening of the sealing end cap 401 with and tightly against the other end of the filter element assembly, rotate the pressure plate 601 to press the stainless steel filter element, and install the upper protective cover 103.

[0067] 4. Introduce protective gas and adjust the position of the welding torch 5 so that it can be smoothly inserted into the welding torch insertion tube of the upper protective cover 103 of the outer protective device 1.

[0068] 5. Arc initiation welding: During the welding process, the position of the welding torch is observed through the arc-blocking glass 101 at the square opening on the upper protective cover 103, and the position is adjusted from time to time. Since welding causes shrinkage, the pressure plate 601 should be tightened appropriately according to the observed actual situation.

[0069] 6. Cooling and disassembly: After the stainless steel filter element is welded, continue to introduce protective gas to cool it for 3 to 5 seconds, then remove the upper protective cover 103 of the outer protective device 1, then remove the pressure plate 601, remove the stainless steel filter element (with inner protective device 3), and take out the stainless steel filter element.

[0070] Under the protection of the aforementioned combined irregular cross-section annular protective window, the welded joints and surrounding surfaces of the sealed end caps and connecting rings of the welded stainless steel filter element are metallic in color or silver-white, meeting the product's appearance requirements. In terms of applicability, this protective window has a simple structure and is easy to operate. With just a brief introduction, operators can master its operation and use it with ease.

[0071] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A combined irregular cross-section annular protective window for automatic welding of filter elements, wherein the filter element mainly consists of a sealing end cap (401), a filter screen (402), and a connecting ring (403), characterized in that: The ring-shaped protective window includes, The positioning device (6) includes at least a pressure plate (601) and a positioning pressure plate (603) with equal outer diameters, and the pressure plate (601) and the positioning pressure plate (603) are coaxially assembled. The inner protective device (3) includes at least one outer circular surface. The diameter of the outer circular surface is equal to the diameter of the pressure plate (601) and the positioning pressure plate (603). The inner surface of the outer circular surface is an inner surface that is consistent with the outer surface of the filter screen (402). The two axial end faces of the outer circular surface are both annular planes. The outer protective device (1) includes at least an inner circular hole, a gas nozzle (104), a welding torch insertion tube, and an observation window. The diameter of the inner circular hole is equal to the diameter of the outer circular surface of the inner protective device (3), the pressure plate (601), and the positioning pressure plate (603). The gas nozzle (104) and the welding torch insertion tube are connected to the inner circular hole, and the observation window passes through the inner circular hole. The pressure plate (601), the positioning pressure plate (603) and the inner protective device (3) are inserted into the inner circular hole, and the inner protective device (3) is located between the pressure plate (601) and the positioning pressure plate (603); When the filter element is inserted into the inner surface of the inner protective device (3), an annular protective cavity with an irregular cross-section is formed between one end face of the pressure plate (601) or the positioning pressure plate (603) and the axial end face of the outer circular surface of the inner protective device (3), the inner wall of the inner circular hole of the outer protective device (1), the sealing end cap (401), and the connecting ring (403). The fitting clearance between the outer circle of the pressure plate (601) or the positioning pressure plate (603) and the inner circular hole of the outer protective device (1), and the fitting clearance between the outer circular surface of the inner protective device (3) and the inner circular hole of the outer protective device (1) form an airflow guiding and heat dissipation channel, and the volume of the annular protective cavity meets the following conditions: The protective gas from the nozzle (104) fills the annular protective cavity in a time of less than or equal to 2 seconds.

2. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 1, characterized in that: It also includes, The base (2) is mainly composed of a fixed seat (201) and an adjusting screw (202). The fixed seat (201) has a vertical plate with a through groove. The top of the vertical plate has a pin hole and a threaded through hole, wherein the threaded through hole is connected to the through groove. The threaded part of the adjusting screw (202) is connected in the threaded through hole, and the head of the adjusting screw (202) is located in the through groove. The boss and guide pins (105) are located at the lower end of the outer protective device (1). Two guide pins (105) are inserted into the boss. The outer protective device (1) is positioned on the upright plate of the base (2) by the two guide pins (105).

3. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 1, characterized in that: The positioning device (6) also includes, The mandrel (602) is coaxially mounted on the pressure plate (601) and the positioning pressure plate (603); The base plate (604) has a positioning groove, and one end of the spindle (602) is detachably connected to the positioning groove. The base plate (604), the positioning groove and the spindle (602) are coaxial.

4. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 1, characterized in that: The inner protective device (3) includes a lower cover (301) and an upper cover (302). The outer surface of the lower cover (301) and the upper cover (302) after being spliced ​​together forms an outer circular surface, and the inner surface after being spliced ​​together forms an inner surface. The axial end faces on both sides after being spliced ​​together are annular planes.

5. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 4, characterized in that: The lower cover (301) is provided with a boss, and the upper cover (302) is provided with a groove. The lower cover (301) and the upper cover (302) are spliced ​​together by the boss and the groove.

6. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 1, characterized in that: The external protective device (1) includes a lower protective cover (102) and an upper protective cover (103). After the lower protective cover (102) and the upper protective cover (103) are spliced ​​together, their internal space forms an inner circular hole.

7. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 6, characterized in that: The lower protective cover (102) is provided with a boss, and the upper protective cover (103) is provided with a groove. The lower protective cover (102) and the upper protective cover (103) are spliced ​​together by the boss and the groove.

8. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 6, characterized in that: The upper protective cover (103) is provided with an air nozzle (104), a welding torch insertion tube and an observation window, and an arc-blocking glass (101) is movably connected to the observation window.

9. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 6, characterized in that: The lower protective cover (102) is provided with a stop (106) on its axial end face to restrict the axial sliding of the upper protective cover (103).

10. The annular protective window with a combined irregular cross-section for automatic welding of filter elements according to claim 1, characterized in that: The end face of the pressure plate (601) or positioning pressure plate (603) forming the annular protective cavity is an end face with an angle; The outer circular surface of the inner protective device (3) has beveled ends at both ends.

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