Stator core silicon steel sheet stamping device

Abstract

The present invention discloses a stator core silicon steel sheet stamping device, and relates to the technical field of silicon steel sheet stamping. The present invention provides a stator core silicon steel sheet stamping device for flattening silicon steel sheets before stamping. A stator core silicon steel sheet stamping device includes a chassis, the chassis is fixedly connected to a base frame, the base frame is fixedly connected to a feed frame, the feed frame is slidably connected to a pressing frame, and the pressing frame is rotatably connected to a pressing wheel for flattening the silicon steel sheet. The silicon steel sheet passes between the feed frame and the pressing wheel, and the pressing frame is pressed down. The silicon steel sheet is flattened by controlling the pressure applied by the pressing wheel to the silicon steel sheet. In this way, the silicon steel sheet is flattened before stamping to avoid local warping or unevenness such as wavy edges of the silicon steel sheet, which causes the stamping die to be unable to close accurately and affects the quality of the silicon steel sheet, thereby reducing the scrap rate.

Description

Technical Field

[0001] The invention relates to the technical field of silicon steel sheet stamping, and in particular to a stator core silicon steel sheet stamping device. Background Art

[0002] The motor stator core is made of several silicon steel sheets stacked and fixed together. The silicon steel sheets are in the shape of a circular disk and have excellent electromagnetic properties. They are important components for manufacturing motor cores. In order to meet the needs of assembly and also to realize the production method of assembly line, silicon steel sheets are usually placed on a stamping line during the production process. The silicon steel sheets are then stamped into silicon steel sheets of various shapes through a stamping device. Finally, the stamped silicon steel sheets are stacked and assembled into a set of motor cores. Since silicon steel sheets are very thin and are usually packed in curled form for ease of transportation and storage, the flatness of the silicon steel sheets needs to be ensured so that they can be stamped well and subsequently stacked. In the prior art, the silicon steel sheets are generally flattened after stamping. However, when stamping silicon steel sheets that have not been flattened, the stamping die may not be able to be closed accurately due to unevenness such as local warping or wavy edges of the silicon steel sheets, which affects the quality of the silicon steel sheets during stamping and increases the scrap rate during stamping.

[0003] How to design a stator core silicon steel sheet stamping device that flattens the silicon steel sheets before stamping is a technical problem that the present invention needs to solve. Summary of the invention

[0004] In order to overcome the disadvantage that the bending state of silicon steel sheets before flattening will also affect the stamping effect and thus affect the quality of silicon steel sheets, the technical problem to be solved is: to provide a stator core silicon steel sheet stamping device that flattens the silicon steel sheets before stamping.

[0005] The technical solution is as follows: A stator core silicon steel sheet stamping device comprises a chassis, the chassis is fixedly connected to a base frame, a motor is installed in the chassis, the output shaft of the motor is fixedly connected to a rotating disk, the base frame is slidably connected to a sliding frame, the sliding frame is rotatably connected to a connecting rod on a side close to the rotating disk, the connecting rod is rotatably connected to an eccentric position of the rotating disk, a punching head is installed on the side of the sliding frame away from the connecting rod, the base frame is fixedly connected to a feeding frame, the feeding frame is slidably connected to a pressing frame, the pressing frame is rotatably connected to a pressing wheel for flattening the silicon steel sheet, symmetrically distributed first springs are installed between the pressing frame and the feeding frame, and the base frame is fixedly connected to a working frame located directly below the punching head.

[0006] Furthermore, it also includes a reinforcing component for reinforcing the flattened silicon steel sheet, the reinforcing component is arranged between the sliding frame and the feeding frame, the reinforcing component includes a first fixed frame, the first fixed frame is fixed to the sliding frame, the first fixed frame is fixed to a second fixed frame on the side close to the feeding frame, the feeding frame is rotatably connected to a rotating rod, a torsion spring is installed between the rotating rod and the feeding frame, and the rotating rod is fixed to a protruding rod located directly above the pressing frame.

[0007] Furthermore, the rotating rod is arranged in an L shape, and the rotating rod is in contact with and cooperates with the second fixing frame.

[0008] Furthermore, it also includes a first limiting component for limiting the silicon steel sheet, the first limiting component is arranged on the working frame, the first limiting component includes a cover plate, the cover plate is rotatably connected to the working frame, and the cover plate is rotatably connected to first rollers distributed at equal intervals.

[0009] Furthermore, it also includes an automatic feeding component for automatically conveying the silicon steel sheets after stamping, the automatic feeding component is arranged between the working frame and the cover plate, the automatic feeding component includes a second roller, the second roller is rotatably connected to the working frame and the cover plate respectively, the second roller of the working frame and the second roller of the cover plate are both equipped with full gears that mesh with each other, a rotating shaft is rotatably connected in the chassis, a pulley assembly is installed between the rotating shaft and the second roller of the working frame, the rotating shaft is equipped with a one-way gear through a one-way clutch, and a rack is slidably connected to the side of the first fixed frame close to the one-way gear, and the rack meshes with the one-way gear.

[0010] Furthermore, a screw rod for adjusting the height of the rack is included, and the screw rod is rotatably connected to a side of the first fixing frame close to the one-way gear, and the screw rod is threadedly connected to the rack.

[0011] Furthermore, it also includes a second limiting component for limiting the silicon steel sheet, the second limiting component is arranged between the working frame and the chassis, the second limiting component includes a lower pressure frame, the lower pressure frame is slidably connected between the working frame and the chassis, a pushing frame is slidably connected to the side of the chassis close to the lower pressure frame, a second spring is installed between the pushing frame and the chassis, the pushing frame is rotatably connected to a third roller, and a connecting frame is fixedly connected to the side of the first fixed frame close to the pushing frame.

[0012] Furthermore, the lower pressing frame is provided with an oblique groove, and the pushing frame is slidably connected to the oblique groove of the lower pressing frame.

[0013] Furthermore, a side of the connecting frame close to the third roller is inclined, and the connecting frame is in contact with and cooperates with the third roller.

[0014] Furthermore, it also includes a cleaning component for cleaning debris on the workbench, the cleaning component is arranged between the chassis and the base frame, the cleaning component includes an air pump, the air pump is installed in the chassis, the base frame is installed with a nozzle, and the nozzle is connected to the output end of the air pump through an air pipe.

[0015] The advantages of the present invention are as follows: the silicon steel sheet passes through between the feed frame and the pressing wheel, and the pressing frame is pressed down, and the pressure applied by the pressing wheel to the silicon steel sheet is controlled, so that the silicon steel sheet is flattened. In this way, the silicon steel sheet is flattened before stamping to avoid local warping or wavy edges of the silicon steel sheet and other unevenness, which causes the stamping die to be unable to close accurately and affects the quality of the silicon steel sheet, thereby reducing the scrap rate; the second fixed frame moves upward to push the rotating rod to reverse, and the rotating rod drives the convex rod to reverse and push the pressing frame to drive the pressing wheel to move downward and automatically move downward to flatten the silicon steel sheet, thereby reducing manual operation; the silicon steel sheet is pressed by the first roller to limit the silicon steel sheet and at the same time make the silicon steel sheet Keep it flat, so that when stamping the silicon steel sheet, the silicon steel sheet is prevented from displacement and bending; by rotating the screw, the screw drives the rack to move up and down, so that the stamped silicon steel sheet spacing can be adjusted according to the size of the silicon steel sheet stamping, and the second roller is intermittently rotated to automatically convey the stamped silicon steel sheet out, thus reducing manual operation and saving time and effort; the silicon steel sheet is pressed by the lower pressure frame to further limit the silicon steel sheet and keep it flat at the same time; the gas is delivered by the air pump to blow the gas out from the nozzle, so as to clean the debris on the feed rack and avoid excessive debris accumulating on the feed rack to affect the stamping of the silicon steel sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the three-dimensional structure of components such as the chassis, the base frame and the motor of the present invention.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the sliding frame, the punch head and other components of the present invention.

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the feed rack, pressure wheel, pressing rack and other components of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the second fixing frame, the rotating rod, the torsion spring and other components of the present invention.

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the working frame, cover plate and other components of the present invention.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the feed rack, cover plate, first roller and other components of the present invention.

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second roller, full gear, rotating shaft and other components of the present invention.

[0025] Fig.10 It is a schematic diagram of the three-dimensional structure of the components such as the lower pressure frame, the pushing frame and the second spring of the present invention.

[0026] Fig.11 It is a schematic diagram of the three-dimensional structure of the air pump, nozzle and other components of the present invention.

[0027] Figure numbers: 101_chassis, 102_base frame, 103_motor, 104_rotating disk, 105_connecting rod, 106_sliding frame, 107_first fixed frame, 108_punching head, 109_feeding frame, 110_pressing wheel, 111_pressing frame, 112_first spring, 113_working frame, 201_second fixed frame, 202_rotating rod, 203_torsion spring, 204_convex Rod, 301_cover plate, 302_first roller, 401_second roller, 402_full gear, 403_rotating shaft, 404_one-way gear, 405_rack, 406_screw, 407_pulley assembly, 501_lower pressure frame, 502_pushing frame, 503_second spring, 504_third roller, 505_connecting frame, 601_air pump, 602_nozzle, 603_air pipe. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Embodiment 1: A stator core silicon steel sheet stamping device, referring to Figure 1-Figure 5 , comprising a chassis 101, a bottom frame 102 is fixedly connected to the top of the chassis 101, a motor 103 is installed in the chassis 101, a rotating disk 104 is fixedly connected to the output shaft of the motor 103, a sliding frame 106 is slidably connected to the rear of the bottom frame 102, a connecting rod 105 is rotatably connected to the lower part of the sliding frame 106, the connecting rod 105 is rotatably connected to the eccentric position of the rotating disk 104, and a stamping is installed on the upper part of the sliding frame 106 The base frame 102 is fixedly connected to a feeding frame 109 on the right side of the lower part, the feeding frame 109 is slidably connected to a pressing frame 111, the pressing frame 111 is rotatably connected to a pressing wheel 110, the pressing wheel 110 is used to flatten the silicon steel sheet, two first springs 112 are installed between the pressing frame 111 and the feeding frame 109, the base frame 102 is fixedly connected to a working frame 113, and the working frame 113 is located directly below the punching head 108.

[0030] When in use, the silicon steel sheet is passed between the feed frame 109 and the pressing wheel 110, and the pressing frame 111 is pressed downward, the first spring 112 is compressed, and the pressing frame 111 drives the pressing wheel 110 to move downward, so that the pressing wheel 110 contacts the silicon steel sheet. By controlling the pressure applied by the pressing wheel 110 to the silicon steel sheet, the pressing wheel 110 can flatten the silicon steel sheet when the silicon steel sheet moves below the punch head 108. In this way, the silicon steel sheet is flattened before stamping to avoid local warping or unevenness such as wavy edges of the silicon steel sheet, which may cause the stamping die to be unable to close accurately. The quality of the silicon steel sheet is affected, thereby reducing the scrap rate. Then, the motor 103 is started, and the output shaft of the motor 103 drives the rotating disk 104 to rotate. The rotating disk 104 drives the sliding frame 106 to move up and down through the connecting rod 105. The sliding frame 106 drives the punching head 108 to move up and down to punch the silicon steel sheet. After the punching is completed, the motor 103 can be turned off, and then the pressing frame 111 is released, and then the pressing frame 111 and the pressing wheel 110 are driven to move upward and reset under the action of the first spring 112 resetting.

[0031] Example 2, based on Example 1, refer to Figure 1 , Figure 2 and Figure 6 , also includes a reinforcement component, the reinforcement component is used to reinforce the flattened silicon steel sheet, the reinforcement component is arranged between the sliding frame 106 and the feeding frame 109, the reinforcement component includes a first fixed frame 107, the first fixed frame 107 is fixedly connected to the sliding frame 106, the first fixed frame 107 is fixedly connected to the right side of the second fixed frame 201, the feeding frame 109 is rotatably connected with a rotating rod 202, a torsion spring 203 is installed between the rotating rod 202 and the feeding frame 109, the rotating rod 202 is fixedly connected with a protruding rod 204, the protruding rod 204 is located directly above the pressing frame 111, the rotating rod 202 is arranged in an L shape, and the rotating rod 202 is in contact with the second fixed frame 201.

[0032] When the sliding frame 106 moves up and down, the sliding frame 106 drives the first fixed frame 107 to move up and down, and the first fixed frame 107 drives the second fixed frame 201 to move up and down. Since the rotating rod 202 is set in an L shape, when the second fixed frame 201 moves downward, it will push the rotating rod 202 to rotate, and the torsion spring 203 is deformed, and the rotating rod 202 drives the convex rod 204 to rotate. When the second fixed frame 201 moves downward and passes over the rotating rod 202, the rotating rod 202 and the convex rod 204 are reversed and reset under the action of the torsion spring 203. When the second fixed frame 201 When moving upward, since the rotating rod 202 is set in an L shape, the upward movement of the second fixing frame 201 will push the rotating rod 202 to reverse, the torsion spring 203 is deformed, and the rotating rod 202 drives the convex rod 204 to reverse and contact the pressing frame 111, and then pushes the pressing frame 111 to drive the pressing wheel 110 to move downward and contact the silicon steel sheet, so that the pressing wheel 110 automatically moves downward to flatten the silicon steel sheet. In this way, manual operation is reduced. When the second fixing frame 201 moves upward and passes over the rotating rod 202, the rotating rod 202 and the convex rod 204 are driven to rotate and reset under the action of the torsion spring 203 resetting.

[0033] Reference Figure 1 , Figure 2 , Figure 7 and Figure 8 , and also includes a first limiting component, the first limiting component is used to limit the silicon steel sheet, the first limiting component is arranged on the working frame 113, the first limiting component includes a cover plate 301, the cover plate 301 is rotatably connected to the working frame 113, and the cover plate 301 is rotatably connected to the first rollers 302 distributed at equal intervals.

[0034] The cover plate 301 is rotated forward to open, and the cover plate 301 drives the first roller 302 to rotate forward. After the silicon steel sheet is moved to below the punching head 108, the cover plate 301 and the first roller 302 are reset, so that the first roller 302 presses the silicon steel sheet, thereby limiting the position of the silicon steel sheet and keeping the silicon steel sheet flat. In this way, when the silicon steel sheet is punched, displacement and bending of the silicon steel sheet are prevented.

[0035] Reference Figure 1 , Figure 2 and Fig. 9, and also includes an automatic feeding component, which is used to automatically convey the silicon steel sheet after stamping. The automatic feeding component is arranged between the working frame 113 and the cover plate 301, and the automatic feeding component includes two second rollers 401, and the two second rollers 401 are respectively rotatably connected to the working frame 113 and the cover plate 301. The second rollers 401 of the working frame 113 and the second rollers 401 of the cover plate 301 are both installed with full gears 402, and the two full gears 402 are meshed with each other. The chassis 101 is rotatably connected with a rotating shaft 403. A pulley assembly 407 is installed between the rotating shaft 403 and the second roller 401 of the working frame 113. The pulley assembly 407 consists of a belt and two pulleys. A one-way gear 404 is installed at the rear of the rotating shaft 403 through a one-way clutch. A rack 405 is slidably connected to the left side of the first fixed frame 107. The rack 405 is meshed with the one-way gear 404. The screw 406 is rotatably connected to the left side of the first fixed frame 107. The screw 406 is used to adjust the height of the rack 405. The screw 406 is threadedly connected to the rack 405.

[0036] The silicon steel sheet passes through between the two second rollers 401, and the screw 406 is rotated. The screw 406 drives the rack 405 to move up and down. In this way, the spacing of the silicon steel sheet being punched can be adjusted according to the size of the silicon steel sheet being punched. After the rack 405 is adjusted, when the first fixing frame 107 moves up and down, the first fixing frame 107 drives the rack 405 to move up and down. When the rack 405 moves downward and meshes with the one-way gear 404, the one-way clutch causes the one-way gear 404 to idle and does not drive the rotating shaft 403 to rotate. When the rack 405 moves upward and meshes with the one-way gear 404, When the gears are engaged, the one-way gear 404 drives the rotating shaft 403 to rotate, and the rotating shaft 403 drives the second roller 401 on the lower side to rotate through the pulley assembly 407, and the second roller 401 on the lower side drives the upper and lower second rollers 401 to reverse through the full gear 402, so that the second roller 401 pulls the silicon steel sheet to the right through friction. When the rack 405 is separated from the one-way gear 404, the second roller 401 stops rotating and stops pulling the silicon steel sheet to the right. In this way, the second roller 401 can intermittently rotate to automatically convey the stamped silicon steel sheet out, thereby reducing manual operations and saving time and effort.

[0037] Reference Figure 1 , Figure 2 and Fig.10, also includes a second limiting component, the second limiting component is used to limit the silicon steel sheet, the second limiting component is arranged between the working frame 113 and the chassis 101, the second limiting component includes a lower pressure frame 501, the lower pressure frame 501 is slidably connected between the working frame 113 and the chassis 101, the right part of the chassis 101 is slidably connected with a pushing frame 502, the lower part of the lower pressure frame 501 is provided with an oblique groove, the pushing frame 502 is slidably connected to the oblique groove of the lower pressure frame 501, a second spring 503 is installed between the pushing frame 502 and the chassis 101, the rear part of the pushing frame 502 is rotatably connected to the third roller 504, the right part of the first fixed frame 107 is fixedly connected to a connecting frame 505, the lower part of the connecting frame 505 is inclined, and the connecting frame 505 is in contact with the third roller 504.

[0038] The silicon steel sheet is passed between the upper part of the lower pressing frame 501 and the feeding frame 109. When the first fixing frame 107 moves downward, the first fixing frame 107 drives the connecting frame 505 to move downward. Due to the inclined setting of the lower side of the connecting frame 505, the connecting frame 505 pushes the third roller 504 to drive the pushing frame 502 to move forward. The second spring 503 is stretched. Under the action of the inclined groove of the lower pressing frame 501, the pushing frame 502 drives the lower pressing frame 501 to move forward. The frame 501 moves downward to press the silicon steel sheet, further limiting the silicon steel sheet and keeping the silicon steel sheet flat. When the first fixing frame 107 moves upward, the first fixing frame 107 drives the connecting frame 505 to move upward and reset, and then drives the pushing frame 502 and the third roller 504 to move backward and reset under the action of the second spring 503. Under the action of the inclined groove of the lower pressing frame 501, the pushing frame 502 drives the lower pressing frame 501 to move upward and reset.

[0039] Reference Figure 1 , Figure 2 and Fig.11 , also includes a cleaning component, the cleaning component is used to clean the debris on the workbench 113, the cleaning component is arranged between the chassis 101 and the base frame 102, the cleaning component includes an air pump 601, the air pump 601 is installed in the lower part of the chassis 101, a nozzle 602 is installed at the lower part of the base frame 102, and the nozzle 602 is connected to the output end of the air pump 601 through an air pipe 603.

[0040] The air pump 601 is started to deliver gas, so that the gas is blown out from the nozzle 602, thereby cleaning the debris on the feed rack 109 to prevent excessive debris from accumulating on the feed rack 109 and affecting the stamping of the silicon steel sheet. After the stamping is completed, the air pump 601 can be turned off.

[0041] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A stator core silicon steel sheet stamping device, characterized in that: The invention comprises a machine case (101), wherein the machine case (101) is fixedly connected to a base frame (102), a motor (103) is installed in the machine case (101), an output shaft of the motor (103) is fixedly connected to a rotating disk (104), the base frame (102) is slidably connected to a sliding frame (106), a side of the sliding frame (106) close to the rotating disk (104) is rotatably connected to a connecting rod (105), the connecting rod (105) is rotatably connected to an eccentric position of the rotating disk (104), a punching head (108) is installed on a side of the sliding frame (106) away from the connecting rod (105), a feeding frame (109) is fixedly connected to the base frame (102), and the feeding frame (109) is fixedly connected to the feeding frame (109). 9) a pressing frame (111) is slidably connected, the pressing frame (111) is rotatably connected to a pressing wheel (110) for flattening the silicon steel sheet, a symmetrically distributed first spring (112) is installed between the pressing frame (111) and the feeding frame (109), and the bottom frame (102) is fixedly connected to a working frame (113) located directly below the punching head (108); and also includes a first limiting component for limiting the silicon steel sheet, the first limiting component is arranged on the working frame (113), the first limiting component includes a cover plate (301), the cover plate (301) is rotatably connected to the working frame (113), and the cover plate (301) is rotatably connected to first rollers (302) distributed at equal intervals; It also includes a reinforcing component for reinforcing and flattening the silicon steel sheet, the reinforcing component is arranged between the sliding frame (106) and the feeding frame (109), the reinforcing component includes a first fixed frame (107), the first fixed frame (107) is fixedly connected to the sliding frame (106), a second fixed frame (201) is fixedly connected to the side of the first fixed frame (107) close to the feeding frame (109), the feeding frame (109) is rotatably connected to a rotating rod (202), a torsion spring (203) is installed between the rotating rod (202) and the feeding frame (109), and the rotating rod (202) is fixedly connected to a protruding rod (204) located directly above the pressing frame (111); The rotating rod (202) is arranged in an L shape, and the rotating rod (202) is in contact with and fits with the second fixing frame (201).

2. A stator core silicon steel sheet stamping device according to claim 1, characterized in that: The invention also includes an automatic feeding assembly for automatically conveying the silicon steel sheet after stamping, the automatic feeding assembly being arranged between the working frame (113) and the cover plate (301), the automatic feeding assembly including a second roller (401), the second roller (401) being rotatably connected to the working frame (113) and the cover plate (301), the second roller (401) of the working frame (113) and the second roller (401) of the cover plate (301) both being provided with fully toothed parts that mesh with each other. A rotating shaft (403) is rotatably connected inside the chassis (101), a pulley assembly (407) is installed between the rotating shaft (403) and the second roller (401) of the working frame (113), a one-way gear (404) is installed on the rotating shaft (403) via a one-way clutch, a rack (405) is slidably connected to a side of the first fixed frame (107) close to the one-way gear (404), and the rack (405) is meshed with the one-way gear (404).

3. A stator core silicon steel sheet stamping device according to claim 2, characterized in that: It also includes a screw rod (406) for adjusting the height of the rack (405); a side of the first fixing frame (107) close to the one-way gear (404) is rotatably connected to the screw rod (406); and the screw rod (406) is threadedly connected to the rack (405).

4. A stator core silicon steel sheet stamping device according to claim 3, characterized in that: The invention also includes a second limiting component for limiting the silicon steel sheet, the second limiting component is arranged between the working frame (113) and the chassis (101), and the second limiting component includes a lower pressure frame (501), the lower pressure frame (501) is slidably connected between the working frame (113) and the chassis (101), a pushing frame (502) is slidably connected on a side of the chassis (101) close to the lower pressure frame (501), a second spring (503) is installed between the pushing frame (502) and the chassis (101), the pushing frame (502) is rotatably connected to a third roller (504), and a connecting frame (505) is fixedly connected to a side of the first fixed frame (107) close to the pushing frame (502).

5. A stator core silicon steel sheet stamping device according to claim 4, characterized in that: The lower pressing frame (501) is provided with an oblique groove, and the pushing frame (502) is slidably connected to the oblique groove of the lower pressing frame (501).

6. A stator core silicon steel sheet stamping device according to claim 5, characterized in that: The side of the connecting frame (505) close to the third roller (504) is arranged to be inclined, and the connecting frame (505) is in contact with and cooperates with the third roller (504).

7. A stator core silicon steel sheet stamping device according to claim 6, characterized in that: It also includes a cleaning component for cleaning debris on the working frame (113), the cleaning component is arranged between the chassis (101) and the base frame (102), the cleaning component includes an air pump (601), the air pump (601) is installed in the chassis (101), the base frame (102) is installed with a nozzle (602), and the nozzle (602) and the output end of the air pump (601) are connected via an air pipe (603).

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