Liquid suction device

Abstract

To prevent gas generated from a liquid etc. from being defused as much as possible in an operation where the liquid is suctioned from a container.SOLUTION: A liquid suction device 10 is used for suctioning a liquid L stored in a container 50 out of the container 50 that includes an opening 52 which is closed by an opening plug 51. The liquid suction device 10 includes a hood 11 that covers the opening 52 of the container 50, an exhaust pipe 12 connected to an exhaust treatment device 41 and that passes gas to be discharged, a suction pipe 15, and a suction drive device 16 that suctions the liquid L in the container 50 via the suction pipe 15. The hood 11 includes a discharging connection part 21 connected with the exhaust pipe 12 and that sends gas in the hood 11 to the exhaust pipe 12 and an upper wall 22 including a through hole 23 located above the opening 52. The suction pipe 15 passes through the through hole 23 and the opening 52.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fluid suction device. [Background technology]

[0002] In the production of fertilizers, dyes, petroleum products, and the like, oleum, which is obtained by absorbing sulfur trioxide into concentrated sulfuric acid, is sometimes used for sulfonation, nitration, or the production of nitrate esters. Fluids such as oleum are distributed in sealed containers such as drums. When in use, the container is opened, a suction tube is inserted into the opening of the container, and the fluid is sucked out by a pump. As a technique for sucking out fluid from a container, for example, the device disclosed in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 5-69379 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, the method for siphoning fluid from a container such as a drum is as follows. A worker manually removes the plug from the drum and inserts a suction tube into the drum, making it possible to suction with a pump. The pump then operates, sucking the fluid out of the drum through the suction tube.

[0005] In the case of oleum as described above, even if there is only a short time between removing the cap and inserting the suction tube, the gas generated inside the drum (smoke containing sulfur trioxide, etc.) or the gas generated by the reaction between the moisture in the air that flows into the opened drum and the fluid inside the drum may escape from the opening and disperse into the atmosphere.

[0006] Therefore, the present disclosure aims to provide a fluid suction device that can minimize the diffusion of gas generated by a fluid or the like when sucking the fluid out of a container such as a drum. [Means for solving the problem]

[0007] A fluid suction device is used to suck out a fluid stored in a container having an opening closed by a stopper. The fluid suction device includes a hood covering the opening of the container, an exhaust pipe connected to an exhaust treatment device and through which exhaust gas passes, a suction pipe, and a suction drive device that sucks the fluid from the container through the suction pipe, the hood having a discharge connection part connected to the exhaust pipe for sending gas inside the hood to the exhaust pipe, and an upper wall having a through hole located above the opening, and the suction pipe passing through the through hole and the opening. [Effects of the Invention]

[0008] According to the fluid suction device of the present invention, it is possible to minimize the diffusion of gas generated by the fluid or the like during the operation of sucking the fluid out of the container. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the configuration of an example of a fluid suction device of the present invention. [Figure 2] FIG. 2 is an explanatory diagram showing the hood and its surroundings. [Figure 3] FIG. 3 is an explanatory view showing a part of the unplugging jig. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Outline of the embodiment of the present invention> Hereinafter, an outline of an embodiment of the present invention will be listed and described. (1) The fluid suction device of the present invention is used to suck out a fluid stored in a container having an opening closed by a stopper. The fluid suction device includes a hood covering the opening of the container, an exhaust pipe connected to an exhaust treatment device and through which exhaust gas passes, a suction pipe, and a suction drive device that sucks the fluid from the container through the suction pipe, the hood having a discharge connection part connected to the exhaust pipe for sending gas inside the hood to the exhaust pipe, and an upper wall having a through hole located above the opening, and the suction pipe passing through the through hole and the opening.

[0011] With the fluid suction device, even if gas generated in the container flows out through the opening, the hood covers the opening, thereby preventing the gas from diffusing. Furthermore, the exhaust treatment device exhausts the gas inside the hood through the exhaust pipe, thereby further effectively preventing the gas from diffusing. With the hood covering the opening of the container, a suction tube can be inserted into the opening of the container through a through-hole in the top wall of the hood, and the suction tube will suck out the fluid from the container.

[0012] (2) The fluid suction device of (1) has a supply pipe through which dry air passes, and the hood has a supply connection part to which the supply pipe is connected for sending the dry air into the hood. Even if the fluid in the container reacts with, for example, moisture-containing air and gas (smoke) is generated, supplying dry air into the hood prevents the fluid in the container from reacting with the air.

[0013] (3) In the fluid suction device of (1) or (2), the through hole is larger than the plug. With the hood covering the opening of the container, the plug removed from the container can be taken out of the hood through the through-hole.

[0014] (4) In the fluid suction device of (3), the stopper has a threaded portion that allows it to be attached and detached to the part having the opening, and the fluid suction device has a stopper opening tool that has a head that can pass through the through hole and a shaft to which the head is attached, and the head has an engagement portion that engages with the stopper in the direction of rotating the stopper and an suction portion that adsorbs the stopper. With the hood covering the opening of the container, the head of the uncapping tool passes through the through-hole in the hood. With the engaging part of the head engaged with the stopper, the stopper can be removed from the container by rotating the shaft. The removed stopper is attracted to the head, and when the shaft is pulled up, the stopper is removed from the hood.

[0015] (5) The fluid suction device of (1) or (2) has a lower frame having an installation space for the container, an upper frame provided on the lower frame having a lifting space for raising and lowering the suction tube, and a support part that supports the hood at a position above the installation space. When a container is placed in the installation space and the hood is positioned over the container, the hood covers the opening of the container. The suction tube passes through the through-hole in the hood and the opening of the container. The liquid in the container is sucked out by the suction force of the suction drive unit.

[0016] (6) In the fluid suction device of (5), the support portion can alternatively hold the hood in a working position in which the hood covers the opening of the container installed in the installation space, and in a retracted position away from the working position. The container is installed in the installation space with the hood in the retracted position. When the hood moves from the retracted position to the working position, it is held in the working position. At the working position, the hood covers the opening of the container.

[0017] (7) Any one of the fluid suction devices (1) to (6) has a frame having an installation space in which a weighing device for placing the container and measuring its weight can be installed, and the hood is held in a non-contact state with the container. The metering device can meter the liquid while the fluid is being drawn from the container, and since the hood does not contact the container, the metering is accurate.

[0018] <Details of the embodiment of the present invention> Hereinafter, the details of the embodiments of the present invention will be described. [Overall configuration of the fluid suction device] Fig. 1 is a structural diagram showing an example of a fluid suction device of the present invention. The fluid suction device 10 shown in Fig. 1 is a device used to suck out a fluid (liquid) L stored in a container 50. The container 50 in this embodiment is a drum. Below, a case where the container 50 is a drum 50 will be described.

[0019] The fluid L contained in the drum 50 is not particularly limited, but in this embodiment, it is a fluid that generates smoke (smoke-producing fluid), specifically, fuming sulfuric acid. This fluid L reacts with air containing moisture to generate gas (smoke). In addition to fuming sulfuric acid, examples of the fluid L include concentrated hydrochloric acid, fuming nitric acid, perchloric acid, chlorosulfonic acid, and thionyl chloride, which all generate smoke.

[0020] The drum 50 will now be described. The drum 50 has a top plate 53, which has an opening 52 that is closed by a stopper 51. The drum 50 shown in Fig. 1 has the stopper 51 removed. The stopper 51 is removed from the portion of the drum 50 that has the opening 52 by a stopper removal tool 30, which will be described later.

[0021] Plug 51 has a disk shape and has a first screw portion 511 on its periphery. Top plate 53 has a second screw portion 521 at a portion having opening 52, which is fastened to first screw portion 511. By rotating plug 51, plug 51 can be attached to and detached from drum 50. In other words, first screw portion 511 allows plug 51 to be attached to and detached from the portion of top plate 53 having opening 52.

[0022] The fluid suction device 10 shown in Figure 1 has a hood 11 that covers the opening 52 of the drum 50, an exhaust pipe 12, a supply pipe 13, a suction pipe 15, a suction drive device 16, a frame 17, a support part 20, and an opening jig 30.

[0023] The frame 17 has a lower frame 18 and an upper frame 19. The lower frame 18 is installed on the floor, for example. The upper frame 19 is provided on top of the lower frame 18. The lower frame 18 and the upper frame 19 are each constructed by combining steel materials such as steel sections and steel plates. The frame 17 has an internal space S as a space surrounded by the steel materials. The internal space S includes an installation space S1 for the container 50 and a lifting space S2 for raising and lowering the suction tube 15. The lower frame 18 has the installation space S1 inside thereof. The upper frame 19 has the lifting space S2 inside thereof.

[0024] The upper frame 19 has a ceiling wall 191. The ceiling wall 191 covers the internal space S from above. Even if gas generated by the fluid L in the drum 50 flows into the internal space S and rises, the ceiling wall 191 receives the gas and can minimize the gas from flowing out to the outside.

[0025] The exhaust pipe 12 is a pipe connected to the hood 11. The exhaust pipe 12 is connected to an exhaust treatment device (scrubber) 41, and passes gas G1 exhausted from the hood 11. The exhaust pipe 12 has flexible piping 121 in at least a portion thereof. The exhaust pipe 12 passes through the side wall of the frame 17.

[0026] The supply pipe 13 is connected to a heater 47 and a compressor 48. The compressor 48 sends air from the atmosphere to the heater 47, which heats the air to turn it into dry air. The supply pipe 13 is connected to the hood 11 and is a pipe through which dry air G2 passes. The dry air G2 is supplied into the hood 11 through the supply pipe 13. The supply pipe 13 has flexible piping 131 in at least a portion thereof. The exhaust pipe 12 passes through the side wall of the frame 17.

[0027] 2 is an explanatory diagram showing the hood 11 and its surroundings. The hood 11 has a cylindrical side wall 24 and an upper wall 22 connected to the upper end of the side wall 24. The hood 11 has a cylindrical shape that opens downward. The upper wall 22 has a through-hole 23 located above the opening 52 (plug 51) of the drum 50. The through-hole 23 is larger than the plug 51. As will be described later, with the hood 11 covering the opening 52 of the container 50, the plug 51 removed from the container 50 (see FIG. 1) can be taken out of the hood 11 through the through-hole 23.

[0028] In FIG. 2, the hood 11 has an outlet connection 21 provided on the side wall 24 and a supply connection 26 provided on the side wall 24 . The exhaust connection part 21 is a joint to which the exhaust pipe 12 is connected. The gas G1 in the hood 11 is sent to the exhaust pipe 12 through the exhaust connection part 21. The supply connection part 26 is a joint to which the supply pipe 13 is connected. Dry air G2 is sent into the hood 11 through the supply connection part 26. The discharge connection 21 is provided on the side wall 24 above the supply connection 26 .

[0029] The suction pipe 15 (see FIG. 1) is a pipe for sucking out the fluid L in the drum 50. The suction drive device 16 sucks the fluid L in the container 50 through the suction pipe 15. The suction drive device 16 is, for example, a suction pump. The sucked fluid L is sent to, for example, another container not shown.

[0030] The suction tube 15 passes through the through hole 23 and the opening 52. The suction tube 15 has a straight tube section 151 that is long in the vertical direction and has rigidity, and a flexible tube section 152 that is connected to the straight tube section 151 and has flexibility. The straight tube section 151 is inserted into the drum 50. The flexible tube section 152 is located inside the frame 17 (lifting space S2). The fluid suction device 10 of this embodiment has a first actuator 42 that raises and lowers the suction tube 15.

[0031] The actuator 42 is configured by, for example, an air cylinder. The actuator 42 has a movable part 421 that moves up and down, and the movable part 421 is attached to a part (straight pipe part 151) of the suction pipe 15. When the actuator 42 operates, the straight pipe part 151 moves up and down. When the suction pipe 15 is in the lower position, the tip (lower end) 153 of the suction pipe 15 is located in the liquid L in the drum 50. As shown by the two-dot chain line in FIG. 1 , when the suction pipe 15 is in the upper position, the tip 153 of the suction pipe 15 is located above the drum 50 and the hood 11.

[0032] When the drum 50 is placed in the installation space S1 and the hood 11 covers the opening 52 of the drum 50, the actuator 42 operates to lower the suction pipe 15 from the upper position to the lower position.

[0033] The fluid suction device 10 has a second actuator 43 that moves the suction tube 15 in the horizontal direction. The actuator 43 transports the suction tube 15 (together with the first actuator 42) between the upper position where the tip 153 of the suction tube 15 is located above the hood 11 and a non-working position that is located at a predetermined horizontal position from the upper position.

[0034] The suction pipe 15 (straight pipe portion 151) has a lid 155 midway along its longitudinal direction (see FIG. 2). The lid 155 is, for example, a circular plate-shaped member, and is fixed to the suction pipe 15. The outer peripheral contour shape of the lid 155 is larger than the through-hole 23 of the hood 11. Therefore, the lid 155 closes the through-hole 23 while resting on the upper wall 22 of the hood 11. This prevents the gas G1 inside the hood 11 from leaking out through the through-hole 23. When the hood 11 is in the working position described below and the suction tube 15 is in the lower position, the lid 155 comes into contact with the upper wall 22. When the lid 155 comes into contact with (rests on) the upper wall 22, the tip 153 of the suction tube 15 is below the liquid level in the drum 50 and above the bottom plate 54 of the drum 50.

[0035] Although not shown, a sealing material may be provided around the through-hole 23 in the upper wall 22 or on the lid 155. This makes it possible to more effectively prevent the gas G1 from leaking from between the upper wall 22 and the lid 155. With the lid 155 placed on the hood 11, as shown in FIG. 1, the tip 153 of the suction pipe 15 is positioned above the bottom plate 54 of the drum 50, and the tip 153 is not in contact with the bottom plate 54.

[0036] Support portion 20 supports hood 11 at a position above installation space S1. Support portion 20 has a beam-like member 171 attached to a part of frame 19. Hood 11 is mounted on beam-like member 171 in a state in which it can be displaced in the up and down direction. The hood 11 can be moved between an upper retracted position and a lower working position. Figure 2 shows the hood 11 in the working position. In the working position, the hood 11 covers the opening 52 of the drum 50. In the working position, the hood 11 is held by the support part 20 without contacting the top plate 53 and opening 52 of the container 50. A vertical gap (a gap of about 5 mm) is provided between the hood 11 in the working position and the top plate 53.

[0037] In the case of the fluid suction device 10 of this embodiment (see FIG. 1), the installation space S1 of the frame 17 is a space in which the drum 50 and the weighing device 45 can be installed. The weighing device 45 measures the weight of the drum 50 placed on it. The weighing device 45 is, for example, a platform scale. During the operation of sucking the fluid L from the drum 50, the weighing device 45 weighs the drum 50 and the liquid L remaining in the drum 50. The weight of the sucked liquid L is calculated from the weight loss due to the sucking operation. For such weighing, the hood 11 does not come into contact with the drum 50, which ensures accurate weighing.

[0038] The retracted position is a position where the hood 11 is retracted upward from the working position. With the hood 11 in the retracted position, it becomes easy to set up the drum 50 in the installation space S1 directly below the hood 11. Then, by lowering the hood 11 to the working position, the hood 11 and the opening 52 of the drum 50 become closer to each other.

[0039] The support portion 20 may be configured to selectively hold the hood 11 at a working position in which the hood 11 covers the opening 52 of the drum 50 placed in the installation space S1, and at a retracted position away from the working position. For example (see FIG. 2), the support portion 20 has a first fitting 201 that holds the hood 11 at the working position, and a second fitting (not shown, having the same shape as the first fitting 201) that holds the hood 11 at the retracted position. The first fitting 201 and the second fitting are provided on the beam-shaped member 171. The hood 11 is held at the working position by engaging a protrusion 111 on the hood 11 with the first fitting 201, and the hood 11 is held at the retracted position by engaging the protrusion 111 with the second fitting.

[0040] The hood 11 may be moved up and down manually by an operator, or may be electrically powered. In this embodiment, the hood 11 is moved manually, and therefore the hood 11 has a handle 112 that the operator can grasp.

[0041] As described above, drum 50 is installed in installation space S1 with hood 11 in the retracted position, which is the upper position. When drum 50 is placed in installation space S1 and hood 11 is displaced from the retracted position to the working position, which is the lower position, hood 11 covers opening 52 of drum 50 at that working position. In this state, spout 51 is removed and suction tube 15 is lowered, allowing the liquid L inside drum 50 to be sucked out.

[0042] The unplugging jig 30 (see FIG. 1) has a head 31 that can pass through the through-hole 23 of the hood 11, and a shaft 32 to which the head 31 is attached. FIG. 3 is an explanatory diagram showing a part of the unplugging jig 30. The head 31 has an engagement portion 311 and a suction portion 312. The engaging portion 311 engages with the plug 51 in the direction (opening direction) of rotating the plug 51. The plug 51 has a protrusion on its surface, and the engaging portion 311 engages with the protrusion. The attraction part 312 attracts the plug 51. The plug 51 contains iron and is attracted to a magnet. Therefore, the attraction part 312 has a magnet.

[0043] With the hood 11 covering the opening 52 of the container 50 (but before the suction tube 15 is attached), the head 31 of the uncapping jig 30 passes through the through-hole 23 of the hood 11. With the engagement portion 311 of the head 31 engaged with the stopper 51, the shaft 32 is rotated. This makes it possible to remove the stopper 51 from the container 50. The removed stopper 51 is attracted to the head 31, and when the shaft 32 is pulled up, the stopper 51 can be removed from the hood 11.

[0044] The operations of the opening jig 30, that is, the operation of inserting the head 31 into the hood 11, the rotation of the shaft 32 to remove the plug 51, and the operation of lifting up the head 31 that has adsorbed the plug 51, may be performed manually by an operator, or may be motorized. In this embodiment, the operation of the opening jig 30 is manual, and therefore the opening jig 30 (see FIG. 1) has a handle 33 that is grasped by an operator.

[0045] [Fluid suction method] A fluid suction operation (fluid suction method) using the fluid suction device 10 having the above-described configuration will be described. 1, a drum 50 is placed in an installation space S1. In this embodiment, a weighing device 45 is provided in the installation space S1, and the drum 50 is placed on the weighing device 45. Before opening the drum 50, that is, before removing the stopper 51 from the opening 52, a local exhaust environment is formed around the opening 52.

[0046] To create a local exhaust environment, the hood 11 is placed in the work position, with the hood 11 covering the opening 52 closed by the valve 51. The heater 47 and compressor 48 are operated, and dry air G2 is supplied into the hood 11 through the supply pipe 13. The exhaust treatment device 41 begins to suction the gas inside the hood 11 through the exhaust pipe 12. At this time, the gas inside the hood 11 is the atmosphere or dry air G2. As a result, a local exhaust environment is obtained.

[0047] The head 31 of the opening jig 30 is inserted into the hood 11 through the through-hole 23 of the hood 11. The engaging portion 311 of the head 31 (see FIG. 3) is engaged with the stopper 51, and the shaft 32 of the opening jig 30 is rotated. As a result, the stopper 51, which has been attached by a screw to the portion of the drum 50 having the opening 52, is removed from that portion. The removed stopper 51 is adsorbed by the suction portion 312 of the head 31. The opening jig 30 is raised, and the head 31 is removed from the hood 11, whereby the stopper 51 is removed from the hood 11.

[0048] When drum 50 is opened, gas (smoke) G1 flows out from opening 52, and the gas G1 flows into hood 11. Since a local exhaust environment has already been achieved inside hood 11 as described above, the gas G1 is discharged through exhaust pipe 12 to exhaust treatment device 41. The flow rate (air volume) of the gas G1 discharged through the exhaust pipe 12 is set to such an extent that the gas G1 does not flow out from the gap between the hood 11 and the top plate 53 of the drum 50 and from the through-hole 23 of the hood 11.

[0049] Dry air G2 is introduced into the hood 11 through the supply pipe 13. This prevents moisture-laden air from flowing into the drum 50, reducing the generation of smoke due to reaction with the fluid L.

[0050] As described above, after removing the plug 51 from the hood 11 using the unplugging tool 30, the suction tube 15 is inserted through the through-hole 23 of the hood 11. The lid 155 of the suction tube 15 rests on the upper wall 22 of the hood 11, closing the through-hole 23. As a result of the above, the fluid L in the drum can 50 is ready to be sucked through the suction pipe 15. The suction drive device (suction pump) 16 is operated, and the fluid L is sucked. The weight of the drum can 50 is measured by the measuring device 45, and when a predetermined amount of fluid L has been sucked, the suction function of the suction drive device 16 is stopped.

[0051] Thereafter, the suction tube 15 is removed from the drum 50 and the hood 11. With the hood 11 covering the opening 52, the stopper 51 is attached to the opening 52 using the cap removal jig 30. That is, with the head 31 of the cap removal jig 30 holding the stopper 51 by suction, the head 31 is inserted through the through-hole 23 of the hood 11. The stopper 51 is placed over the opening 52, and the shaft 32 of the cap removal jig 30 is rotated to fasten the stopper 51 to the portion having the opening 52. The cap removal jig 30 is removed from the hood 11.

[0052] When the drum 50 is sealed by the plug 51, the exhaust through the exhaust pipe 12 is stopped, and the supply of the dry air G2 through the supply pipe 13 is stopped. The hood 11 is moved from the lower working position to the upper retracted position, and then the drum 50 is carried out from the installation space S1.

[0053] [Regarding the fluid suction device 10 of this embodiment] As described above, the fluid suction device 10 of this embodiment is used to suck out the fluid L stored in the drum 50. To this end, the fluid suction device 10 has a hood 11 that covers the opening 52 of the drum 50, and an exhaust pipe 12 that is connected to the exhaust treatment device 41 and through which the gas G1 to be exhausted passes. The hood 11 has an upper wall 22 (see FIG. 2 ), which has a through-hole 23 located above the opening 52. The hood 11 has a discharge connector 21. The discharge connector 21 is connected to the exhaust pipe 12 and is a joint for sending the gas G1 in the hood 11 to the exhaust pipe 12.

[0054] In this way, hood 11 covers opening 52 of drum 50, thereby suppressing diffusion of gas G1 even if gas G1 generated inside drum 50 flows out from opening 52. Moreover, exhaust treatment device 41 exhausts gas G1 inside hood 11 through exhaust pipe 12. This further effectively suppresses diffusion of gas G1.

[0055] The fluid suction device 10 has a suction tube 15 that passes through the through-hole 23 and the opening 52, and a suction drive device 16 that sucks the fluid L from the container 50 through the suction tube 15. With the hood 11 covering the opening 52 of the container 50, the suction tube 15 can be inserted into the opening 52 of the container 50 through the through-hole 23 in the upper wall 22 of the hood 11. The suction tube 15 is used to suck out the fluid L from the container 50.

[0056] Fluid suction device 10 further has supply pipe 13 through which dry air G2 passes. Hood 11 has supply connection part 26. Supply connection part 26 is a joint to which supply pipe 13 is connected and which sends dry air G2 into hood 11. Even if fluid L in drum 50 reacts with air containing moisture to generate gas (smoke), supplying dry air G2 into hood 11 prevents fluid L in drum 50 from reacting with the air.

[0057] 〔others〕 The embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiments, and includes all modifications within the scope of equivalents to the configurations described in the claims. [Explanation of symbols]

[0058] 10 Fluid suction device 11. Food 12 exhaust pipe 13 Supply pipe 15 Suction tube 16 Suction drive unit 17 frames 18 Lower frame 19 Upper frame 20 Support part 21 Discharge connection 22 Upper Wall 23 through hole 26 Supply Connection 30 Opening tool 31 head 311 Engagement part 312 Adsorption part 32 shaft 41 Exhaust treatment device 45 Weighing device 50 containers (drums) 51 Stopper 511 Threaded part 52 Aperture L fluid G1 Gas G2 Dry Air S1 installation space S2 Lifting space

Claims

1. A fluid suction device used to suck out a fluid stored in a container having an opening closed by a stopper, comprising: a hood covering the opening of the container; an exhaust pipe connected to the exhaust treatment device and through which exhaust gas passes; A suction tube; a suction drive device that sucks the fluid from the container through the suction tube; and the hood has an exhaust connection portion connected to the exhaust pipe and sending gas inside the hood to the exhaust pipe, and an upper wall having a through hole located above the opening, The suction tube passes through the through hole and the opening. Fluid suction device.

2. A supply pipe for passing dry air is provided. The hood has a supply connection to which the supply pipe is connected to send the dry air into the hood. The fluid suction device of claim 1 .

3. The through hole is larger than the plug. The fluid suction device according to claim 1 or 2.

4. The plug has a threaded portion that allows it to be attached to and detached from the portion having the opening, an unplugging jig having a head that can pass through the through hole and a shaft to which the head is attached; The head has an engaging portion that engages with the plug in a direction in which the plug is rotated, and a suction portion that attracts the plug. The fluid suction device according to claim 3 .

5. a lower frame having an installation space for the container; an upper frame provided on the lower frame and having a lifting space for lifting the suction tube; a support portion that supports the hood at a position above the installation space; having The fluid suction device according to claim 1 or 2.

6. the support portion is capable of selectively holding the hood at a working position where the hood covers the opening of the container installed in the installation space, and at a retracted position away from the working position. The fluid suction device according to claim 5 .

7. a frame having an installation space in which a weighing device for placing the container and measuring its weight can be installed; The hood is held out of contact with the container. The fluid suction device according to claim 1 or 2.

Images