Industrial robot welding automatic lifting guard

Abstract

The application belongs to the technical field of welding, and discloses an industrial robot welding automatic lifting protection device, which comprises a welding robot and an air pump. The air pump injects high-pressure air into the air storage chamber through the cooperation of the protection assembly and other structures, the pneumatic assembly pushes the bearing box to fold vertically, each welding protection lens is pushed to splice into a circle, the spattering welding slag and strong flash are blocked, the high-pressure air enters the exhaust chamber and is discharged through the inclined exhaust pipe, the welding slag and harmful gas generated in the welding are blown to the vicinity of the protection assembly on the opposite side, the air passes through the top of the air inlet chamber, according to Bernoulli's principle, the suction inside the air inlet chamber and the welding slag and harmful gas around the bearing box are absorbed, the air pushes the fan to rotate, and the transmission belt drives the fan in the air inlet chamber to rotate, at this time, the suction inside the air inlet chamber is further strengthened, so that the harmful gas and welding slag around the bearing box are better collected and filtered.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, specifically an automatic lifting and protective device for industrial robot welding. Background Technology

[0002] Industrial robot welding refers to the automated technology that uses robots to complete welding operations. It mainly consists of the robot body, control cabinet, and welding equipment. Using welding robots to complete welding work can significantly improve the integrity and quality of welds. However, it's important to note that during the welding process, some welding fumes and spatter will still drift into the factory. Even if workers are not performing welding work, the fumes can still reach them, potentially causing injury. Furthermore, if the workpiece being welded is large, the welding power will increase, and spatter may even fly out of the welding area, potentially burning the clothing or skin of nearby workers. Existing protective solutions typically only use motors to raise the protective cover to block the intense light and splattering slag during welding. However, it should be noted that the resulting odor cannot be removed, and the splattering slag cannot be collected. This means that the protective performance of existing technologies is not perfect, and subsequent manual processing is still required. Summary of the Invention

[0003] To address the problems mentioned in the background section, this invention provides an automatic lifting and protective device for industrial robot welding, which solves the problems of ineffective protection due to the inability to remove welding odors and collect spatter.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an automatic lifting and protective device for industrial robot welding, comprising a welding robot and an air pump, and a workbench, wherein an air storage chamber is provided at the bottom of the workbench, and the air outlet of the air pump is connected to the air storage chamber. The top of the workbench is circumferentially and equidistantly equipped with protective components and pneumatic components. The protective assembly includes a support box hinged to the top of the workbench. The interior of the support box is divided into an exhaust chamber and an intake chamber. The tops of the exhaust chamber and the intake chamber are connected to each other through a filter plate. The air storage chamber is connected to the exhaust chamber through a rubber air tube. Fans are installed in the exhaust chamber and the intake chamber, and the two fans are connected by a transmission belt. The top of the exhaust chamber is connected to the outside through an exhaust pipe, and the bottom of the intake chamber is connected to the outside through a collection assembly. The interior of the exhaust chamber is provided with a set of welding protective lenses arranged in an alternating pattern; The air pump delivers high-pressure air to the pneumatic components through the air storage chamber, and the pneumatic components drive the carrier box to fold and the welding protective lens to move.

[0005] Preferably, the rubber air tube delivers high-pressure air to the exhaust chamber and allows it to flow upwards, eventually being sprayed onto the welding point through the exhaust pipe. Suction is generated in the intake chamber, and the flowing air drives the fan inside the exhaust chamber to rotate, which in turn drives the fan inside the intake chamber to rotate via a transmission belt. The fan inside the intake chamber delivers air upwards.

[0006] Preferably, the exhaust pipe is tilted downwards, and the suction generated by the air intake chamber causes welding slag and odor in the air to enter the collection assembly, which can filter harmful air and collect welding slag.

[0007] Preferably, the welding protective lens has an arc design, and the welding protective lenses in each protective component move alternately and can be combined into a circle.

[0008] Preferably, the pneumatic assembly includes a sealed telescopic rod fixed to the workbench, the bottom of the sealed telescopic rod being connected to the air storage chamber via a metal pipe, and the top of the sealed telescopic rod being slidably hinged to the side of the carrier box; The protective assembly also includes a one-way valve fixed inside the rubber air tube. The hinge point between the carrier box and the workbench is located on one side of the bottom of the carrier box. A counterweight is provided inside the exhaust chamber. The hinge point and the counterweight are designed symmetrically.

[0009] Preferably, the protective assembly further includes rubber protective blocks equidistantly arranged on the workbench, and the side of the carrier box after being folded can rest on the rubber protective blocks.

[0010] Preferably, the pneumatic assembly further includes two symmetrically designed pull rods hinged to the telescopic end of the sealing telescopic rod. The two pull rods are respectively hinged to each of the staggered welded protective lenses, and the hinge points at both ends of the pull rods are rotatable.

[0011] Preferably, the collection assembly includes a filter cartridge fixed in the air intake chamber, a collection cartridge threaded to the side of the filter cartridge, and an activated carbon pack movably engaged between the filter cartridge and the collection cartridge, the activated carbon pack being movable between the filter cartridge and the collection cartridge.

[0012] Preferably, the collection assembly further includes a second filter plate fixed to the side of the activated carbon bag, the second filter plate facing the outside of the carrier box.

[0013] Preferably, the inside of the collecting cylinder is provided with an inclined cavity, and the side of the collecting cylinder for limiting the movement of the activated carbon pack is provided with a groove, the outer side of which is flush with the inner wall of the filter cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordinated use of protective components and other structures, uses an air pump to deliver high-pressure air to the air storage chamber. A pneumatic component then pushes the carrier box to fold vertically, causing the individual welding protective lenses to be pushed and assembled into a circle, blocking splattered welding slag and intense flashes. The high-pressure air enters the exhaust chamber and is discharged through an inclined exhaust pipe. The air is sprayed towards the welding point, blowing the welding slag and harmful gases generated during welding towards the vicinity of the protective components on the opposite side. As the air passes through the top of the air intake chamber, according to Bernoulli's principle, the air intake chamber creates suction, drawing in welding slag and harmful gases from around the carrier box. The air drives a fan to rotate, which in turn rotates via a transmission belt within the air intake chamber. At this point, the suction force inside the air intake chamber is further strengthened, thus better collecting and filtering harmful gases and welding slag from around the carrier box.

[0015] This invention, through the coordinated arrangement of pneumatic and protective components, allows for several key changes. Before welding begins, a pneumatic pump supplies high-pressure air into the air storage chamber. Due to the one-way valve, the air preferentially passes through the metal pipe into the sealing telescopic rod, forcing it to push the carrier box to fold vertically. After welding, the pneumatic pump stops supplying air, and the weight of the counterweight compresses the carrier box to fold outwards. The air inside the sealing telescopic rod is then slowly discharged through the one-way valve until the carrier box is horizontal. This effectively reduces the risk of collisions and damage to the protective components caused by welding robot or worker misoperation. Finally, the carrier box rests on the rubber protective block, which counteracts the vibration caused by the rapid descent of the carrier box, thus preventing excessive damage to the hinged parts of the device and ensuring smooth operation.

[0016] This invention, through the coordinated arrangement of collection components and other structures, ensures that welding slag is preferentially blocked by filter plate two, while harmful gases are largely filtered after passing through activated carbon bags. When the activated carbon bags slide between the filter cylinder and the collection cylinder, the welding slag on filter plate two will fall off due to the vibration generated by sliding and folding. During the sliding process, it is pushed to the side of the collection cylinder by the frame of filter plate two, and finally enters the internal chamber of the collection cylinder through the slot on the side of the collection cylinder. Since the internal chamber of the collection cylinder is designed with an inclination, the folding of the carrier box will not cause the welding slag to slide back into the filter cylinder from the collection cylinder, further avoiding the situation where welding slag accumulation prevents air from passing through filter plate two. Attached Figure Description

[0017] Figure 1 This is a schematic diagram showing the positions of the welding robot and the protective device of the present invention; Figure 2 This is a schematic diagram of the external structure of the present invention; Figure 3 This is a first schematic diagram of the appearance structure of the protective component of the present invention; Figure 4 This is a first schematic diagram of the appearance structure of the protective component of the present invention; Figure 5 This is a schematic diagram of the structure and cooperation between the gas storage chamber and the rubber air tube of the present invention; Figure 6 This is a schematic diagram of the internal structure of the carrier box of the present invention; Figure 7 This is a front view of the internal structure of the carrier box of the present invention; Figure 8 This is a front view of the exterior structure of the protective component of the present invention; Figure 9 This is a schematic diagram of the internal structure and assembly of the components for this invention; Figure 10 This is a schematic diagram showing the disassembly of the component structure for this invention.

[0018] In the diagram: 1. Welding robot; 2. Workbench; 3. Air pump; 4. Air storage chamber; 5. Pneumatic components; 51. Sealing telescopic rod; 52. Pull rod; 53. Metal pipe; 6. Protective components; 61. Carrier box; 611. Exhaust chamber; 612. Intake chamber; 62. Welding protective lens; 63. Rubber air hose; 631. One-way valve; 64. Exhaust pipe; 65. Filter plate one; 66. Fan; 67. Rubber protective block; 68. Counterweight; 7. Collection components; 71. Filter cartridge; 72. Collection cartridge; 73. Activated carbon bag; 74. Filter plate two. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 10 As shown, the present invention provides an automatic lifting and protective device for industrial robot welding, including a welding robot 1 and an air pump 3. The device is characterized in that it also includes a workbench 2, and an air storage chamber 4 is provided at the bottom of the workbench 2. The air outlet of the air pump 3 is connected to the air storage chamber 4. The top of the workbench 2 is circumferentially and equidistantly equipped with protective components 6 and pneumatic components 5; The protective assembly 6 includes a carrier box 61 hinged to the top of the workbench 2. The interior of the carrier box 61 is divided into an exhaust chamber 611 and an intake chamber 612. The tops of the exhaust chamber 611 and the intake chamber 612 are connected to each other through a filter plate 65. The air storage chamber 4 is connected to the exhaust chamber 611 through a rubber air pipe 63. The exhaust chamber 611 and the intake chamber 612 are equipped with interleaved fans 66. The two fans 66 are connected by a transmission belt. The top of the exhaust chamber 611 is connected to the outside through an exhaust pipe 64. The bottom of the intake chamber 612 is connected to the outside through a collection assembly 7. The welding protective lens 62 has an arc design, and the welding protective lenses 62 in each protective component 6 can move in an alternating manner and merge into a circle.

[0021] The rubber air tube 63 delivers high-pressure air to the exhaust chamber 611 and makes it flow upward. Finally, it is sprayed onto the welding point through the exhaust pipe 64. Suction is generated in the intake chamber 612. The flowing air drives the fan 66 inside the exhaust chamber 611 to rotate and drives the fan 66 inside the intake chamber 612 to rotate through the transmission belt. The fan 66 inside the intake chamber 612 delivers air upward.

[0022] The exhaust pipe 64 is tilted downwards, and the suction generated by the air intake chamber 612 causes welding slag and odor in the air to enter the collection component 7, which can filter harmful air and collect welding slag.

[0023] A set of welding protective lenses 62 are staggered inside the exhaust chamber 611; The air pump 3 delivers high-pressure air to the pneumatic component 5 through the air storage chamber 4, and the pneumatic component 5 drives the carrier box 61 to fold and the welding protective lens 62 to move.

[0024] Using the above scheme: When the welding robot 1 is welding, the air pump 3 supplies high-pressure air to the air storage chamber 4, and the pneumatic component 5 pushes the carrier box 61 to fold to a vertical state, that is... Figure 3 The state in; At this time, the pneumatic component 5 will also push the welding protective lens 62 in each protective component 6 to slide onto the exhaust chamber 611, thereby splicing them into a circle, thus blocking the welding slag and strong flash during the welding process, and further protecting the eyes, body and surrounding flammable materials of the workers. During this period, after the pneumatic component 5 completes the folding of the carrier box 61, high-pressure air enters the exhaust chamber 611 through the rubber air tube 63 and is discharged through the exhaust pipe 64. Since the exhaust pipe 64 is designed to be inclined, the air will be sprayed towards the welding point and blow the welding slag and harmful gases generated during welding towards the vicinity of the protective component 6 on the opposite side, thereby guiding the general trajectory of the welding slag splash and air dispersion. During the high-pressure air injection, the air passes through the top of the intake chamber 612. According to Bernoulli's principle, when the faster-flowing air passes through the top of the intake chamber 612, the air pressure at this point will decrease significantly. The air inside the intake chamber 612 is in a relatively still state with a slow flow rate and a relatively high internal pressure. The pressure difference between the high internal pressure and the low top pressure will push the air inside the intake chamber 612 to flow towards the low top pressure area, thereby generating suction from a macroscopic perspective. As a result, the welding slag and harmful gases around the carrier box 61 are absorbed into the collection component 7, and the collection component 7 collects the welding slag and filters the harmful gases. The specific explanation of Bernoulli's principle will not be elaborated upon hereafter; During the airflow process inside the exhaust chamber 611, the air also passes through the fan 66, causing the fan 66 to rotate. This rotation, in turn, drives the fan 66 inside the intake chamber 612 to rotate via the transmission belt. At this time, the suction inside the intake chamber 612 is further enhanced, thus better collecting and filtering harmful gases and welding slag around the carrier box 61.

[0025] like Figures 1-7 As shown, the pneumatic assembly 5 includes a sealing telescopic rod 51 fixed on the workbench 2. The bottom of the sealing telescopic rod 51 is connected to the air storage chamber 4 through a metal tube 53, and the top of the sealing telescopic rod 51 slides and is hinged to the side of the carrier box 61. The protective component 6 also includes a one-way valve 631 fixed inside the rubber air tube 63. The hinge point between the carrier box 61 and the workbench 2 is located on one side of the bottom of the carrier box 61. A counterweight 68 is provided inside the exhaust chamber 611. The hinge point and the counterweight 68 are designed symmetrically.

[0026] The protective component 6 also includes rubber protective blocks 67 equidistantly arranged on the workbench 2, and the side of the carrier box 61 after being folded can fall on the rubber protective blocks 67.

[0027] Using the above scheme: Before the welding work begins, the air pump 3 injects high-pressure air into the air storage chamber 4. Since a one-way valve 631 is also installed inside the rubber air pipe 63, the air preferentially enters the sealing telescopic rod 51 through the metal pipe 53, forcing the sealing telescopic rod 51 to push the carrier box 61 to fold over. Figure 7 In the vertical position, air cannot enter the sealed telescopic rod 51, and the air pressure pushes the one-way valve 631 to open and enter the carrier box 61, thereby realizing the protective function of the protective component 6; After welding is completed, the air pump 3 immediately stops supplying air. It should be noted that the hinge point at the bottom of the bearing box 61 is symmetrical to the position of the counterweight 68. That is, the weight of the counterweight 68 will press the bearing box 61 to fold outward. The air inside the sealing telescopic rod 51 will be slowly discharged through the one-way valve 631 until the bearing box 61 is in a horizontal state. Finally, the bearing box 61 falls on the rubber protective block 67. The rubber protective block 67 can offset the vibration caused by the bearing box 61 falling too fast, thereby preventing the hinge part in the device from being excessively damaged and unable to achieve smooth operation. When the carrier box 61 is in a horizontal position, it can effectively reduce the possibility of the protective component 6 being collided and damaged due to the welding robot 1 or worker misoperation, thus further protecting the device.

[0028] like Figures 1-7As shown, the pneumatic assembly 5 also includes two symmetrically designed pull rods 52 hinged to the telescopic end of the sealing telescopic rod 51. The two pull rods 52 are respectively hinged to each of the staggered welding protective lenses 62, and the hinge points at both ends of the pull rods 52 can rotate.

[0029] Using the above scheme: When the sealing telescopic rod 51 retracts, its top will slide to the side of the carrier box 61 and gradually move towards the bottom of the carrier box 61. Figure 7 The movement trajectory of the sealing telescopic rod 51 can be predicted. When the top of the sealing telescopic rod 51 descends, it will pull the welding protective lens 62 through the pull rod 52. Since the welding protective lens 62 can only move within the exhaust chamber 611, the welding protective lens 62 will actually retract into the exhaust chamber 611, thereby preventing the welding protective lens 62 from being damaged by collision after the welding work is completed.

[0030] like Figures 1-10 As shown, the collection assembly 7 includes a filter cartridge 71 fixed in the air intake chamber 612, a collection cartridge 72 threadedly connected to the side of the filter cartridge 71, and an activated carbon pack 73 movably engaged between the filter cartridge 71 and the collection cartridge 72, the activated carbon pack 73 being movable between the filter cartridge 71 and the collection cartridge 72.

[0031] The collection assembly 7 also includes a filter plate 2 74 fixed to the side of the activated carbon bag 73, with the filter plate 2 74 facing the outside of the carrier box 61.

[0032] The collection cylinder 72 has an inclined cavity inside. A groove is provided on the side of the collection cylinder 72 to limit the movement of the activated carbon pack 73; the outer side of the groove is flush with the inner wall of the filter cylinder 71. (See figure.) Using the above scheme: After the negative pressure draws the welding slag and harmful gases into the filter cartridge 71, the welding slag is first blocked by the filter plate 74, and the harmful gases are filtered out after passing through the activated carbon bag 73. However, the simple activated carbon bag 73 cannot completely purify the harmful gases, so other air purification equipment can be used in the room. When the device stops and the protective component 6 is folded by the pneumatic component 5, the filter cylinder 71 is in a vertical state. When the protective component 6 is folded again and put into operation, the activated carbon bag 73 will slide between the filter cylinder 71 and the collection cylinder 72. The welding slag on the filter plate 74 will fall off due to the vibration caused by sliding and folding. During the sliding process, it will be pushed to the side of the collection cylinder 72 by the frame of the filter plate 74. Finally, it will enter the internal chamber of the collection cylinder 72 through the slot on the side of the collection cylinder 72. Since the internal chamber of the collection cylinder 72 is inclined, the folding of the carrier box 61 will not cause the welding slag to slide back into the filter cylinder 71 from the collection cylinder 72, further avoiding the situation where welding slag accumulates and air cannot pass through the filter plate 74. The filter cartridge 71 and the collection cartridge 72 are threaded, so the collection cartridge 72 can be removed and the welding slag inside can be cleaned. The activated carbon bag 73 and the filter plate 74 can also be replaced.

[0033] Working principle and usage process of this invention: When the welding robot 1 is welding, the air pump 3 supplies high-pressure air to the air storage chamber 4. Due to the presence of the one-way valve 631, the air passes through the metal pipe 53 first and pushes the sealing telescopic rod 51 to extend. The carrier box 61 folds to the vertical position, and then the air cannot enter the sealing telescopic rod 51. The air pressure pushes the one-way valve 631 to open and enters the exhaust chamber 611. Finally, it is discharged through the exhaust pipe 64, blowing the welding slag and harmful gases generated by welding towards the vicinity of the protective component 6 on the opposite side, so as to guide the general trajectory of the welding slag splash and air dispersion. Air passes through the top of the air intake chamber 612. According to Bernoulli's principle, suction is generated inside the air intake chamber 612, causing the welding slag and harmful gases around the carrier box 61 to be absorbed into the filter cartridge 71. Air also passes through the fan 66 in the exhaust chamber 611, causing the fan 66 to rotate, and drives the fan 66 in the intake chamber 612 to rotate via the transmission belt, further enhancing the suction.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic lifting and protective device for industrial robot welding, comprising a welding robot (1) and an air pump (3), characterized in that, It also includes a workbench (2), the bottom of which is provided with an air storage chamber (4), and the air outlet of the air pump (3) is connected to the air storage chamber (4); The top of the workbench (2) is circumferentially and equidistantly equipped with protective components (6) and pneumatic components (5). The protective assembly (6) includes a carrier box (61) hinged to the top of the workbench (2). The interior of the carrier box (61) is divided into an exhaust chamber (611) and an intake chamber (612). The tops of the exhaust chamber (611) and the intake chamber (612) are connected to each other through a filter plate (65). The air storage chamber (4) is connected to the exhaust chamber (611) through a rubber air pipe (63). The exhaust chamber (611) and the intake chamber (612) are provided with interleaved fans (66). The two fans (66) are connected by a transmission belt. The top of the exhaust chamber (611) is connected to the outside through an exhaust pipe (64). The bottom of the intake chamber (612) is connected to the outside through a collection assembly (7). A set of welding protective lenses (62) are staggered inside the exhaust chamber (611). The air pump (3) delivers high-pressure air to the pneumatic assembly (5) through the air storage chamber (4) and drives the carrier box (61) to fold and the welding protective lens (62) to move.

2. The automatic lifting and protective device for industrial robot welding according to claim 1, characterized in that: The rubber air tube (63) delivers high-pressure air to the exhaust chamber (611) and flows upward. Finally, it is sprayed onto the welding point through the exhaust pipe (64). Suction is generated in the intake chamber (612). The flowing air drives the fan (66) inside the exhaust chamber (611) to rotate and drives the fan (66) inside the intake chamber (612) to rotate through the transmission belt. The fan (66) inside the intake chamber (612) delivers air upward.

3. The automatic lifting and protective device for industrial robot welding according to claim 1, characterized in that: The exhaust pipe (64) is tilted downwards, and the suction generated by the air intake chamber (612) causes welding slag and odor in the air to enter the collection assembly (7), which is capable of filtering harmful air and collecting welding slag.

4. The automatic lifting and protective device for industrial robot welding according to claim 3, characterized in that: The welding protective lens (62) is designed with an arc shape, and the welding protective lenses (62) in each protective component (6) move in an alternating manner and can be combined into a circle.

5. The automatic lifting and protective device for industrial robot welding according to claim 1, characterized in that: The pneumatic assembly (5) includes a sealing telescopic rod (51) fixed on the workbench (2). The bottom of the sealing telescopic rod (51) is connected to the air storage chamber (4) through a metal pipe (53). The top of the sealing telescopic rod (51) slides and is hinged to the side of the carrier box (61). The protective component (6) also includes a one-way valve (631) fixed inside the rubber air pipe (63). The hinge point between the carrier box (61) and the workbench (2) is located on one side of the bottom of the carrier box (61). The exhaust chamber (611) is provided with a counterweight (68). The hinge point and the counterweight (68) are symmetrically designed.

6. The automatic lifting and protective device for industrial robot welding according to claim 5, characterized in that: The protective component (6) also includes rubber protective blocks (67) equidistantly arranged on the workbench (2), and the side of the carrier box (61) after being folded can fall on the rubber protective blocks (67).

7. The automatic lifting and protective device for industrial robot welding according to claim 6, characterized in that: The pneumatic assembly (5) also includes two symmetrically designed pull rods (52) hinged to the telescopic end of the sealing telescopic rod (51). The two pull rods (52) are respectively hinged to each of the staggered welding protective lenses (62), and the hinge points at both ends of the pull rods (52) can rotate.

8. The automatic lifting and protective device for industrial robot welding according to claim 1, characterized in that: The collection assembly (7) includes a filter cartridge (71) fixed in the air intake chamber (612), a collection cartridge (72) is threadedly connected to the side of the filter cartridge (71), and an activated carbon pack (73) is movably engaged between the filter cartridge (71) and the collection cartridge (72), and the activated carbon pack (73) can move between the filter cartridge (71) and the collection cartridge (72).

9. The automatic lifting and protective device for industrial robot welding according to claim 8, characterized in that: The collection assembly (7) also includes a filter plate two (74) fixed to the side of the activated carbon bag (73), the filter plate two (74) facing the outside of the carrier box (61).

10. The automatic lifting and protective device for industrial robot welding according to claim 9, characterized in that: The inside of the collection cylinder (72) is provided with an inclined cavity. The side of the collection cylinder (72) for limiting the movement of the activated carbon pack (73) is provided with a groove. The outer side of the groove is flush with the inner wall of the filter cylinder (71).

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