Fabric adsorption and carrying device

Abstract

The utility model discloses a kind of fabric adsorption handling devices, including adsorption component, moving assembly, evacuation component and supporting component, the adsorption component includes adsorption unit and lifting unit, the adsorption unit is fixedly arranged in lifting unit lower part, the lifting unit is slidably arranged on moving assembly, the evacuation component is fixedly arranged on moving assembly, and is communicated with adsorption unit, the moving assembly is slidably arranged on supporting component.The utility model has the advantages of: required manpower input cost is low, work efficiency is high, can be one-time laser cutting device every time cutting obtained fabric is all handled to specified position, can improve the production efficiency of laser cutting device.

Description

Technical Field

[0001] This utility model relates to the field of fabric handling technology, specifically to a fabric adsorption and handling device. Background Technology

[0002] Currently, automated fabric cutting technology is quite mature. For example, laser cutting produces fabrics with neat edges, minimal curling, and is very fast. However, most companies currently transport laser-cut fabrics to a pickup platform at one end of the laser cutting machine via a conveyor belt, and then manually move them to the next process step. This fabric handling method is not only labor-intensive and inefficient, but it also consumes production time for the laser cutting machine, reducing its overall production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a fabric adsorption and handling device to solve the technical problems existing in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A fabric adsorption and handling device includes an adsorption component, a moving component, a vacuuming component, and a support component. The adsorption component includes an adsorption unit and a lifting unit. The adsorption unit is fixedly disposed at the lower part of the lifting unit, and the lifting unit is slidably disposed on the moving component. The vacuuming component is fixedly disposed on the moving component and communicates with the adsorption unit. The moving component is slidably disposed on the support component.

[0006] Furthermore, the adsorption unit includes a base plate and a fixing frame. The base plate has several pieces that are fixedly arranged side by side at the bottom of the fixing frame. The top of the fixing frame is fixedly connected to the lifting unit. The base plate is a hollow structure with uniformly distributed micropores at the bottom and a vacuum tube interface at the top. The vacuum tube interface is connected to the vacuum assembly.

[0007] Furthermore, the lifting unit includes a lateral moving frame that slides laterally with the moving component, a lateral moving motor that is fixedly mounted on the lateral moving frame and used to drive the lateral moving frame to move laterally, a vertical lifting cylinder that is fixedly mounted on the lateral moving frame and used to drive the adsorption unit to move vertically, and a vertical guide rod that is fixedly connected to the adsorption unit and slides with the lateral moving frame.

[0008] Furthermore, the front and rear ends of the horizontal moving frame are provided with four horizontal moving sliders for horizontal sliding cooperation with the moving component, and the four horizontal moving sliders are symmetrically arranged in pairs on the bottom left and right sides of the front and rear ends of the horizontal moving frame.

[0009] Furthermore, three horizontal connecting plates are arranged parallel to each other from front to back inside the horizontal moving frame. The middle horizontal connecting plate has a horizontal moving motor fixedly installed in the middle. The left and right ends of the frontmost and rearmost horizontal connecting plates are symmetrically provided with two vertical lifting cylinders, and the extension end of each vertical lifting cylinder is fixedly connected to the adsorption unit.

[0010] Furthermore, each of the horizontal connecting plates has two guide sleeves fixedly installed at its left and right ends, and a vertical guide rod slides through the inside of each guide sleeve. The upper ends of the two vertical guide rods corresponding to each horizontal connecting plate are connected by a connecting plate, and the lower ends pass through the corresponding guide sleeves and are fixedly connected to the adsorption unit.

[0011] Furthermore, the moving component includes a longitudinal moving frame, a longitudinal moving slider fixedly disposed at the bottom of the longitudinal moving frame and slidingly engaged with the support component, a transverse linear guide fixedly disposed at the top of the longitudinal moving frame and slidingly engaged with the transverse moving slider, a transverse linear rack fixedly disposed at the top of the longitudinal moving frame and meshing with the transverse moving motor, and a longitudinal moving motor fixedly disposed on the longitudinal moving frame and used to drive the longitudinal moving frame to move longitudinally.

[0012] Furthermore, there are several longitudinal moving sliders, and these several longitudinal moving sliders are symmetrically distributed at the bottom of the left and right sides of the longitudinal moving frame, and slide in cooperation with the support assembly.

[0013] The transverse linear guide rail has two rails, which are parallel to each other and located on the top of the longitudinal moving frame and on the front and rear sides of the transverse linear rack. Each transverse linear guide rail is in sliding cooperation with two transverse moving sliders on the same side.

[0014] There are two longitudinal moving motors, which are symmetrically arranged on the left and right sides of the longitudinal moving frame and mesh with the support assembly.

[0015] Furthermore, the support assembly includes a support frame and two longitudinal linear guide rails and two longitudinal linear racks respectively disposed on the left and right sides of the top of the support frame;

[0016] The two longitudinal linear guide rails are respectively in sliding cooperation with a number of longitudinal sliding sliders located at the bottom of the left and right sides of the longitudinal moving frame.

[0017] The two longitudinal linear racks are respectively engaged with two longitudinal moving motors located on the left and right sides of the longitudinal moving frame.

[0018] Furthermore, the evacuation assembly includes a vacuum pump and an evacuation pipe; the evacuation pipe includes a main evacuation pipe connected to the vacuum pump and several branch evacuation pipes connected to the main evacuation pipe, each branch evacuation pipe being connected to a evacuation pipe connection provided on the base plate; each branch evacuation pipe is provided with a solenoid valve.

[0019] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0020] (1) The entire process of fabric handling is fully mechanized, and the required manpower input cost is low;

[0021] (2) It has high work efficiency and can transport all the fabric cut by the laser cutting equipment to the designated location in one go;

[0022] (3) It saves time and can improve the production efficiency of laser cutting equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of one embodiment of the fabric adsorption and handling device of this utility model;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 yes Figure 1 Enlarged view at point B in the middle;

[0027] Figure 4 yes Figure 1 A partial structural schematic diagram from one perspective of one embodiment of the fabric adsorption and handling device involved in the invention;

[0028] Figure 5 yes Figure 4 Enlarged view at point C;

[0029] Figure 6 yes Figure 1 A partial structural schematic diagram from another perspective of an embodiment of the fabric adsorption and handling device involved in the invention;

[0030] Figure 7 yes Figure 6 Enlarged view at point D;

[0031] Figure 8 yes Figure 1The right view of the adsorption component and the moving component in the embodiment of the fabric adsorption and handling device involved in the article;

[0032] Figure 9 yes Figure 8 Enlarged view at point E in the middle;

[0033] Figure 10 This is a schematic diagram of the three-dimensional structure of the adsorption component;

[0034] Figure 11 This is a front view of the adsorption component;

[0035] Figure 12 This is a three-dimensional structural diagram of the lifting unit;

[0036] Figure 13 This is a 3D structural diagram of the moving component;

[0037] Figure 14 This is a schematic diagram of the piping connection of the evacuation assembly;

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Adsorption assembly; 101. Adsorption unit; 1011. Base plate; 1011a. Micropores; 1011b. Vacuum tube interface; 1012. Fixing frame; 102. Lifting unit; 1021. Lateral moving frame; 1022. Lateral moving slider; 1023. Lateral connecting plate; 1024. Lateral moving motor; 1025. Vertical lifting cylinder; 1026. Vertical guide rod; 1027. Guide sleeve; 1028. Connecting plate; 1029. Lateral moving gear;

[0040] 2. Moving components; 201. Vertical moving frame; 202. Vertical moving slider; 203. Horizontal linear guide rail; 204. Horizontal linear rack; 205. Vertical moving motor; 206. Vertical moving gear;

[0041] 3. Evacuation assembly; 301. Vacuum pump; 302. Evacuation pipe; 302a. Main evacuation pipe; 302b. Branch evacuation pipe; 302c. Solenoid valve;

[0042] 4. Support assembly; 401. Support frame; 402. Longitudinal linear guide rail; 403. Longitudinal linear rack. Detailed Implementation

[0043] To make the technical means, creative features, achieved objectives and effects of this utility model readily understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0044] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] The present invention will be further described below with reference to the accompanying drawings:

[0046] See Figures 1 to 14 This invention illustrates an embodiment of the fabric adsorption and handling device, comprising an adsorption component 1, a moving component 2, a vacuuming component 3, and a supporting component 4. The adsorption component 1 includes an adsorption unit 101 and a lifting unit 102. The adsorption unit 101 is fixedly disposed at the lower part of the lifting unit 102 for adsorbing fabric. The lifting unit 102 is slidably disposed on the moving component 2 for lifting the adsorption unit 101. The vacuuming component 3 is fixedly disposed on the moving component 2 and communicates with the adsorption unit 101 for vacuuming the adsorption unit 101. The moving component 2 is slidably disposed on the supporting component 4 for moving the adsorption component 1 and the vacuuming component 3 back and forth along the supporting component 4, thereby realizing fabric handling.

[0047] In use, the support assembly 4 is fixedly installed above the cutting bed, and the moving assembly 2 is slidably installed on the support assembly 4. After the fabric on the cutting bed is cut, the moving assembly 2 is first slid to directly above the cutting table of the cutting bed. Then, the lifting unit 102 lowers the adsorption unit 101 until it is in contact with the fabric on the cutting table of the cutting bed. Next, the vacuuming assembly 3 is activated to perform vacuuming on the adsorption unit 101, so that a negative pressure is formed between the adsorption unit 101 and the fabric, thereby adsorbing the fabric. Then, the lifting unit 102 raises the adsorption unit 101 to the initial height. Subsequently, the moving assembly 2 carries the adsorption assembly 101 and the vacuuming assembly 3. Together, they move along the support assembly 4 to the top of the stacking (collecting) table. Then, the lifting unit 102 lowers the adsorption unit 101 to be in contact with the stacking (collecting) table surface. Next, the vacuum assembly 3 is turned off. At this time, the adsorption unit 101 loses its adsorption effect on the fabric, and the fabric will fall onto the stacking (collecting) table surface under the action of gravity. Then, the lifting unit 102 raises the adsorption unit 101 to the initial height. This completes one fabric adsorption and handling operation. Then, the moving assembly 2 moves the adsorption assembly 1 and the vacuum assembly 3 together along the support assembly 4 to the top of the cutting table of the cutting bed, waiting for the next fabric adsorption and handling operation.

[0048] Specifically, see Figure 6 and Figure 7 In the illustrated embodiment, the adsorption unit 101 includes a base plate 1011 and a fixing frame 1012. The base plate 1011 has several pieces that are fixedly arranged side by side at the bottom of the fixing frame 1012. The top of the fixing frame 1012 is fixedly connected to the lifting unit 102. The base plate 1011 is a hollow structure with uniformly distributed micropores 1011a at the bottom and a vacuum tube interface 1011b at the top. The vacuum tube interface 1011b is connected to the vacuuming component 3. The uniformly distributed micropores 1011a at the bottom of the base plate 1011 are used by the vacuuming component 3 to adsorb the cut fabric from the cutting bed.

[0049] Specifically, see Figures 8 to 12 In the illustrated embodiment, the lifting unit 102 includes a lateral moving frame 1021 that slides laterally with the moving component 2, a lateral moving motor 1024 fixedly mounted on the lateral moving frame 1021 and used to drive the lateral moving frame 1021 to move laterally, a vertical lifting cylinder 1025 fixedly mounted on the lateral moving frame 1021 and used to drive the adsorption unit 101 to move vertically, and a vertical guide rod 1026 fixedly connected to the adsorption unit 101 and slidingly engaged with the lateral moving frame 1021.

[0050] More specifically, see Figure 12In the illustrated embodiment, four horizontal sliding sliders 1022 for horizontal sliding cooperation with the moving component 2 are provided at the front and rear ends of the horizontal moving frame 1021, and the four horizontal sliding sliders 1022 are symmetrically arranged in pairs at the bottom of the left and right sides of the front and rear ends of the horizontal moving frame 1021.

[0051] More specifically, see Figure 11 and Figure 12 In the illustrated embodiment, three horizontal connecting plates 1023 are arranged parallel to each other from front to back inside the horizontal moving frame 1021. The middle horizontal connecting plate 1023 has a horizontal moving motor 1024 fixedly installed in the middle. The left and right ends of the frontmost and rearmost horizontal connecting plates 1023 are symmetrically provided with two vertical lifting cylinders 1025, and the telescopic end of each vertical lifting cylinder 1025 is fixedly connected to the adsorption unit 101.

[0052] Furthermore, the vertical lifting cylinder 1025 can be any one of a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder. In the illustrated embodiment, the vertical lifting cylinder 1025 is preferably a pneumatic cylinder.

[0053] More specifically, to ensure the vertical lifting and lowering of the adsorption unit 101, see [reference needed]. Figure 12 In the illustrated embodiment, two guide sleeves 1027 are fixedly provided at both ends of each horizontal connecting plate 1023, and a vertical guide rod 1026 is slidably inserted inside each guide sleeve 1027. The upper ends of the two vertical guide rods 1026 corresponding to each horizontal connecting plate 1023 are connected by a connecting plate 1028, and the lower ends pass through the corresponding guide sleeve 1027 and are fixedly connected to the adsorption unit 101.

[0054] Specifically, see Figure 13 In the illustrated embodiment, the moving component 2 includes a longitudinal moving frame 201, a longitudinal moving slider 202 fixedly disposed at the bottom of the longitudinal moving frame 201 and slidingly engaged with the support component 4, a transverse linear guide rail 203 fixedly disposed at the top of the longitudinal moving frame 201 and slidingly engaged with the transverse moving slider 1022, a transverse linear rack 204 fixedly disposed at the top of the longitudinal moving frame 201 and meshing with the transverse moving motor 1024, and a longitudinal moving motor 205 fixedly disposed on the longitudinal moving frame 201 and used to drive the longitudinal moving frame 201 to move longitudinally.

[0055] More specifically, see Figure 13 In the illustrated embodiment, there are several longitudinal moving sliders 202, and the several longitudinal moving sliders 202 are symmetrically distributed on the bottom of the left and right sides of the longitudinal moving frame 201, and slide in cooperation with the support component 4.

[0056] More specifically, see Figure 13 In the illustrated embodiment, there are two transverse linear guides 203, which are parallel to each other on the top of the longitudinal moving frame 201 and located on the front and rear sides of the transverse linear rack 204. Each transverse linear guide 203 is slidably engaged with two transverse moving sliders 1022 arranged on the same side.

[0057] More specifically, see Figure 13 In the illustrated embodiment, there are two longitudinal movement motors 205, which are symmetrically arranged on the left and right sides of the longitudinal movement frame 201 and engage with the support assembly 4.

[0058] Specifically, see Figures 1 to 3 In the illustrated embodiment, the support assembly 4 includes a support frame 401 and two longitudinal linear guide rails 402 and two longitudinal linear racks 403 respectively disposed on the left and right sides of the top of the support frame 401; wherein, the two longitudinal linear guide rails 402 are respectively slidably engaged with a plurality of longitudinal moving sliders 202 disposed on the bottom of the left and right sides of the longitudinal moving frame 201; the two longitudinal linear racks 403 are respectively engaged with two longitudinal moving motors 205 disposed on the left and right sides of the longitudinal moving frame 201.

[0059] More specifically, see Figure 9 In the illustrated embodiment, a transverse movement gear 1029 is fixedly mounted on the output shaft of the transverse movement motor 1024. During operation, the transverse movement motor 1024 engages with the transverse linear rack 204 via the transverse movement gear 1029 on its output shaft. With the sliding engagement of the transverse movement slider 1022 and the transverse linear guide rail 203, the transverse movement motor 1024 drives the transverse movement frame 1021 to move laterally on the moving assembly 2. It should be noted that the transverse movement frame 1021 can only be finely adjusted left and right on the moving assembly 2.

[0060] More specifically, in the illustrated embodiments, see [reference] Figure 5 Each longitudinal moving motor 205 has a longitudinal moving gear 206 fixedly mounted on its output shaft. During operation, each longitudinal moving motor 205 engages with the longitudinal linear rack 403 on the same side via the longitudinal moving gear 206 on its output shaft. With the sliding engagement of the longitudinal moving slider 202 and the longitudinal linear guide rail 402, the longitudinal moving frame 201 is driven by the longitudinal moving motor 205 to move longitudinally on the support assembly 4. As the longitudinal moving frame 201 moves, the entire adsorption assembly 1 moves along with it, achieving the purpose of transporting the fabric.

[0061] Specifically, see Figure 14In the illustrated embodiment, the evacuation assembly 3 includes a vacuum pump 301 and an evacuation pipe 302. The evacuation pipe 302 includes a main evacuation pipe 302a connected to the vacuum pump 301 and several branch evacuation pipes 302b connected to the main evacuation pipe 302a. Each branch evacuation pipe 302b corresponds to an evacuation pipe interface 1011b on a base plate 1011, and each branch evacuation pipe 302b is equipped with a solenoid valve 302c. Each solenoid valve 302c controls the on / off state of the corresponding branch evacuation pipe 302b, and each branch evacuation pipe 302b is used to evacuate the corresponding base plate 1011. By providing a corresponding solenoid valve 302c on each branch evacuation pipe 302b, the corresponding base plate 1011 can be controlled to adsorb fabric, thereby meeting different fabric adsorption requirements. For example, opening all the solenoid valves 302c on all the vacuum branch pipes 302b can meet the adsorption requirement of adsorbing all the fabric on the cutting bed. Alternatively, opening some of the solenoid valves 302c on the vacuum branch pipes 302b and closing some of the solenoid valves 302c on the vacuum branch pipes 302b can meet the adsorption requirement of adsorbing only some of the fabric on the cutting bed.

[0062] It should be noted that in the fabric adsorption and handling device provided by this utility model, the length and width of the adsorption unit 101 are adapted to the length and width of the cutting table of the cutting bed.

[0063] Finally, it should be noted that the above description is only an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fabric suction handling device, characterized by: The assembly includes an adsorption component (1), a moving component (2), a vacuuming component (3), and a support component (4). The adsorption component (1) includes an adsorption unit (101) and a lifting unit (102). The adsorption unit (101) is fixedly disposed at the lower part of the lifting unit (102). The lifting unit (102) is slidably disposed on the moving component (2). The vacuuming component (3) is fixedly disposed on the moving component (2) and communicates with the adsorption unit (101). The moving component (2) is slidably disposed on the support component (4).

2. The fabric suction handling device according to claim 1, characterized in that: The adsorption unit (101) includes a base plate (1011) and a fixing frame (1012). The base plate (1011) has several pieces that are fixedly arranged side by side at the bottom of the fixing frame (1012). The top of the fixing frame (1012) is fixedly connected to the lifting unit (102). The base plate (1011) is a hollow structure with uniformly distributed micropores (1011a) at the bottom and a vacuum tube interface (1011b) at the top. The vacuum tube interface (1011b) is connected to the vacuum assembly (3).

3. The fabric adsorption and conveying device according to claim 2, characterized in that: The lifting unit (102) includes a transverse moving frame (1021) that slides laterally with the moving component (2), a transverse moving motor (1024) that is fixedly mounted on the transverse moving frame (1021) and used to drive the transverse moving frame (1021) to move laterally, a vertical lifting cylinder (1025) that is fixedly mounted on the transverse moving frame (1021) and used to drive the adsorption unit (101) to move vertically, and a vertical guide rod (1026) that is fixedly connected to the adsorption unit (101) and slides with the transverse moving frame (1021).

4. The fabric suction handling device according to claim 3, characterized in that: The horizontal moving frame (1021) has four horizontal moving sliders (1022) at its front and rear ends for horizontal sliding cooperation with the moving component (2), and the four horizontal moving sliders (1022) are symmetrically arranged in pairs at the bottom of the left and right sides of the front and rear ends of the horizontal moving frame (1021).

5. The fabric suction handling device according to claim 3, characterized in that: The transverse moving frame (1021) has three transverse connecting plates (1023) arranged parallel to each other from front to back. The transverse moving motor (1024) is fixedly installed in the middle of the middle transverse connecting plate (1023). The left and right ends of the transverse connecting plates (1023) at the front end and the rear end are symmetrically provided with two vertical lifting cylinders (1025). The telescopic end of each vertical lifting cylinder (1025) is fixedly connected to the adsorption unit (101).

6. The fabric suction handling device according to claim 5, characterized in that: Two guide sleeves (1027) are fixedly provided at both ends of each of the horizontal connecting plates (1023), and a vertical guide rod (1026) is slidably inserted inside each guide sleeve (1027). The upper ends of the two vertical guide rods (1026) corresponding to each horizontal connecting plate (1023) are connected by a connecting plate (1028), and the lower ends pass through the corresponding guide sleeve (1027) and are fixedly connected to the adsorption unit (101).

7. The fabric suction handling device according to claim 4, characterized in that: The moving component (2) includes a longitudinal moving frame (201), a longitudinal moving slider (202) fixedly disposed at the bottom of the longitudinal moving frame (201) and slidingly engaged with the support component (4) in the longitudinal direction, a transverse linear guide rail (203) fixedly disposed at the top of the longitudinal moving frame (201) and slidingly engaged with the transverse moving slider (1022), a transverse linear rack (204) fixedly disposed at the top of the longitudinal moving frame (201) and meshing with the transverse moving motor (1024), and a longitudinal moving motor (205) fixedly disposed on the longitudinal moving frame (201) and used to drive the longitudinal moving frame (201) to move longitudinally.

8. The fabric suction handling device according to claim 7, characterized in that: The longitudinal moving slider (202) has several, and the several longitudinal moving sliders (202) are symmetrically arranged at the bottom of the left and right sides of the longitudinal moving frame (201) and slide in cooperation with the support component (4); There are two transverse linear guides (203), and the two transverse linear guides (203) are arranged in parallel on the top of the longitudinal moving frame (201) and on the front and rear sides of the transverse linear rack (204). Each transverse linear guide (203) is in sliding engagement with two transverse moving sliders (1022) arranged on the same side. There are two longitudinal moving motors (205), and the two longitudinal moving motors (205) are symmetrically arranged on the left and right sides of the longitudinal moving frame (201) and mesh with the support assembly (4).

9. The fabric suction handling device according to claim 8, characterized in that: The support assembly (4) includes a support frame (401) and two longitudinal linear guide rails (402) and two longitudinal linear racks (403) respectively disposed on the left and right sides of the top of the support frame (401). The two longitudinal linear guide rails (402) correspond to and slide with a number of longitudinal sliding sliders (202) located at the bottom of the left and right sides of the longitudinal moving frame (201); The two longitudinal linear racks (403) are respectively engaged with the two longitudinal moving motors (205) located on the left and right sides of the longitudinal moving frame (201).

10. The fabric suction handling device according to claim 2, characterized in that: The evacuation assembly (3) includes a vacuum pump (301) and an evacuation pipe (302); the evacuation pipe (302) includes a main evacuation pipe (302a) connected to the vacuum pump (301) and several evacuation branch pipes (302b) connected to the main evacuation pipe (302a). Each evacuation branch pipe (302b) is connected to an evacuation pipe interface (1011b) provided on a base plate (1011), and each evacuation branch pipe (302b) is provided with a solenoid valve (302c).

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