Suction device for pneumatic unloader

Abstract

To provide a suction device for pneumatic unloader which can suppress noise.SOLUTION: A suction device for pneumatic unloader which includes a receiver tank which sucks and discharges a bulk material stored in a ship includes: an air suction pipe 300 connected to the receiver tank; a vacuum pump 320 connected to the air suction pipe 300; an air discharge pipe 330 connected to the vacuum pump 320; an idling pipe 360 branching from the air discharge pipe 330 and connected to the air suction pipe; and an idling valve 361 provided at the idling pipe 360.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a suction device for a pneumatic unloader. [Background technology]

[0002] Generally, as shown in Figure 3, a pneumatic unloader 100 is installed at a quay W of a port H where a ship S loaded with various bulk materials B such as grains enters and leaves the port, for sucking up and discharging the bulk materials B stored inside a storage tank S1 of the ship S.

[0003] The pneumatic unloader 100 is equipped with a receiver tank 200 that is arranged so as to be capable of moving freely in the longitudinal direction of the ship S (a direction perpendicular to the plane of the paper in Figure 3) using a traveling mechanism (not shown) and to be capable of rotating freely using a rotating mechanism (not shown).

[0004] An air suction pipe 300 is connected to the upper part of the receiver tank 200. The air suction pipe 300 is connected to a suction port 321 of a vacuum pump 320 such as a roots blower installed inside a casing 310, and an air discharge pipe 330 extending to the outside of the casing 310 is connected to a discharge port 322 of the vacuum pump 320. A silencer 340 for reducing noise is provided on the air discharge pipe 330. A capacity adjustment pipe 350 and an idling pipe 360 ​​are branched and connected from the air suction pipe 300 located inside the casing 310, and a capacity adjustment valve 351 is provided on the capacity adjustment pipe 350, and an idling valve 361 is provided on the idling pipe 360. A soundproofing material 311 is attached to the casing 310, and an air intake port 312 is opened.

[0005] A horizontal pipe 400 that extends laterally and can be expanded and contracted in its axial direction by an expansion mechanism (not shown) is connected to the side of the receiver tank 200 via a pipe joint 410 so that it can be raised and lowered by an expansion mechanism (not shown).

[0006] A vertical pipe 420, which can be freely extended and retracted in the axial direction by an extension mechanism (not shown), is connected to the tip side of the horizontal pipe 400 via a bend pipe 430, and a suction nozzle 440 is provided at the lower end of the vertical pipe 420. The suction nozzle 440 is inserted through the hatch S2 of the ship S to suck up the bulk material B inside the storage tank S1.

[0007] A rotary feeder 500 is provided at the bottom of the receiver tank 200 .

[0008] Inside the receiver tank 200, a filter 210 is provided to prevent the bulk material B from being sucked into the vacuum pump 320.

[0009] When bulk material B is discharged from the storage tank S1 of the ship S anchored in the port H, the vacuum pump 320 is driven with the idling valve 361 open, and first the pneumatic unloader 100 travels by a traveling mechanism (not shown) and rotates by a rotating mechanism (not shown) to position it relative to the desired hatch S2. Even when the vacuum pump 320 is driven, the idling valve 361 is open and air is introduced into the air suction pipe 300 from the idling pipe 360, so that the inside of the receiver tank 200 does not become negative pressure and suction from the suction nozzle 440 is kept stopped.

[0010] Subsequently, the horizontal tube 400 is expanded and contracted in its axial direction by an expansion mechanism (not shown) to adjust its length, and is raised and lowered by an expansion mechanism (not shown).

[0011] Furthermore, the vertical tube 420 is extended and retracted in its axial direction by an extension mechanism (not shown) to adjust its length, and the suction nozzle 440 is inserted through the hatch S2 and positioned near the top surface of the bulk material B inside the storage tank S1.

[0012] In this state, when the idling valve 361 is closed, the inside of the receiver tank 200 becomes negative pressure, and the bulk material B is sucked up from the suction nozzle 440 through the vertical pipe 420 and the horizontal pipe 400 into the inside of the receiver tank 200 .

[0013] At this time, the amount of the bulk material B that is sucked in is controlled by adjusting the opening of the capacity control valve 351.

[0014] The bulk material B sucked up into the receiver tank 200 is transported to a conveyor, hopper, or transport truck (not shown) while the airtightness of the inside of the receiver tank 200 is maintained by the operation of the rotary feeder 500.

[0015] Incidentally, when cargo handling is suspended, including when the suction nozzle 440 is moving between the multiple hatches S2, the idling valve 361 is opened.

[0016] This is because frequent turning on and off of the motor (not shown) of the vacuum pump 320 can lead to the motor breaking down, so the motor is kept on at all times during loading and unloading, and the idling valve 361 is opened as necessary to eliminate the flow of air from the suction nozzle 440 to the vacuum pump 320, so that suction by the suction nozzle 440 is not performed even if the motor is not turned off.

[0017] When the idling valve 361 is opened, air is taken into the inside of the casing 310 through the air intake 312, and it is possible to prevent the inside of the casing 310 from becoming negative pressure more than necessary.

[0018] Incidentally, for example, Patent Document 1 shows the general technical level of a pneumatic unloader having the structure shown in FIG. [Prior art documents] [Patent documents]

[0019] [Patent Document 1] JP 2016-23005 A Summary of the Invention [Problem to be solved by the invention]

[0020] However, as described above, when the idling valve 361 is opened during a cargo-loading halt, the sound generated from the vacuum pump 320 leaks into the inside of the casing 310 through the air suction pipe 300 and the idling pipe 360. Although the casing 310 is fitted with a soundproofing material 311, the sound that leaks into the inside of the casing 310 leaks out from the air intake 312 to the outside, resulting in a problem of increased noise.

[0021] There is also a type of pneumatic unloader 100 in which an idling valve 361 is installed outside the casing 310 and soundproofing material is attached around the idling valve 361, but this is still insufficient as a noise countermeasure, and improvements were desired.

[0022] The present invention has been made in consideration of the above-mentioned problems in the conventional art, and aims to provide a suction device for a pneumatic unloader that can suppress noise. [Means for solving the problem]

[0023] The present invention relates to a suction device for a pneumatic unloader equipped with a receiver tank that sucks up and discharges bulk materials stored on a ship, an air suction pipe connected to the receiver tank; a vacuum pump connected to the air suction tube; an air discharge pipe connected to the vacuum pump; an idling pipe branched from the air discharge pipe and connected to the air suction pipe; an idling valve provided in the idling pipe; This relates to a suction device for a pneumatic unloader equipped with the above.

[0024] In the suction device of the pneumatic unloader, the idling pipe is preferably covered with soundproofing material.

[0025] In the suction device of the pneumatic unloader, a capacity adjustment pipe branched from the air discharge pipe and connected to the air suction pipe; a capacity adjustment valve provided in the capacity adjustment pipe; It can be provided with:

[0026] In the suction device of the pneumatic unloader, it is preferable that the capacity adjustment pipe is covered with soundproofing material. Effect of the Invention

[0027] The suction device of the pneumatic unloader of the present invention has the excellent effect of suppressing noise. [Brief description of the drawings]

[0028] [Figure 1] 1 is a diagram showing the main components of a first embodiment of a suction device for a pneumatic unloader according to the present invention; FIG. [Diagram 2] FIG. 4 is a diagram showing the main components of a second embodiment of the suction device of a pneumatic unloader according to the present invention. [Diagram 3] FIG. 1 is an overall schematic diagram showing an example of a suction device of a conventional pneumatic unloader. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0030] FIG. 1 shows a first embodiment of a suction device for a pneumatic unloader according to the present invention, and in the figure, parts that are given the same reference numerals as those in FIG. 3 represent the same items.

[0031] The first embodiment is characterized in that an idling pipe 360 ​​provided with an idling valve 361 is branched off from the air discharge pipe 330 and connected to the air suction pipe 300, as shown in FIG.

[0032] The idling pipe 360 ​​is covered with a soundproofing material 362. However, the idling pipe 360 ​​does not necessarily have to be covered with the soundproofing material 362.

[0033] Next, the operation of the first embodiment will be described.

[0034] In Fig. 1, when the vacuum pump 320 is driven and the idling valve 361 is closed, air flows from the air suction pipe 300 through the air discharge pipe 330, is silenced by the silencer 340, and is discharged to the outside. As a result, the inside of the receiver tank 200 shown in Fig. 3 becomes negative pressure, and the bulk material B is sucked up from the suction nozzle 440 through the vertical pipe 420 and the horizontal pipe 400 into the receiver tank 200, and loading is performed. At this time, if the opening of the capacity control valve 351 is narrowed, the suction amount of the bulk material B increases, and conversely, if the opening of the capacity control valve 351 is widened, the suction amount of the bulk material B decreases.

[0035] On the other hand, in FIG. 1, when the idling valve 361 is opened, the air in the air discharge pipe 330 flows from the idling pipe 360 ​​to the air suction pipe 300 and is circulated, so that the inside of the receiver tank 200 shown in FIG. 3 does not become negative pressure, and air is no longer sucked in through the suction nozzle 440.

[0036] In this way, even if the idling valve 361 is opened during a cargo-loading halt, air circulates within a closed loop consisting of the air discharge pipe 330, the idling pipe 360, and the air suction pipe 300, so that the sound generated by the vacuum pump 320 is prevented from leaking into the inside of the casing 310 via the air suction pipe 300 and the idling pipe 360. Even with the air intake 312, sound is less likely to leak to the outside, and noise is reduced.

[0037] Moreover, this provides an excellent noise countermeasure compared to the pneumatic unloader 100 of the type in which the idling valve 361 is installed outside the casing 310 and soundproofing material is attached around the idling valve 361.

[0038] Moreover, since the idling pipe 360 ​​is covered with the soundproofing material 362, it is more effective in suppressing the leakage of the sound generated from the vacuum pump 320. It goes without saying that even if the idling pipe 360 ​​is not covered with the soundproofing material 362, the noise suppression effect can be expected.

[0039] In this way, noise can be suppressed.

[0040] FIG. 2 shows a second embodiment of the suction device for a pneumatic unloader according to the present invention, and in the figure, parts that are given the same reference numerals as in FIG. 1 represent the same items.

[0041] The second embodiment is characterized in that, like the first embodiment shown in FIG. 1, an idling pipe 360 ​​equipped with an idling valve 361 is branched off from the air discharge pipe 330 and connected to the air suction pipe 300, and, as shown in FIG. 2, a capacity adjustment pipe 350 equipped with a capacity adjustment valve 351 is branched off from the air discharge pipe 330 and connected to the air suction pipe 300.

[0042] The capacity adjustment pipe 350 is covered with a soundproofing material 352. However, the capacity adjustment pipe 350 does not necessarily have to be covered with the soundproofing material 352.

[0043] Next, the operation of the second embodiment will be described.

[0044] In the second embodiment of Fig. 2, similarly to the first embodiment of Fig. 1, when the vacuum pump 320 is driven and the idling valve 361 is closed, air flows from the air suction pipe 300 through the air discharge pipe 330, is silenced by the silencer 340, and is discharged to the outside. As a result, the inside of the receiver tank 200 shown in Fig. 3 becomes negative pressure, and the bulk material B is sucked up from the suction nozzle 440 through the vertical pipe 420 and the horizontal pipe 400 into the receiver tank 200, and loading and unloading is performed.

[0045] In the second embodiment, when loading and unloading is being performed, if the opening of the capacity control valve 351 is narrowed or widened to increase or decrease the amount of bulk material B being suctioned, the air in the air discharge pipe 330 flows from the capacity adjustment pipe 350 to the air suction pipe 300 and is circulated.

[0046] In other words, when the capacity control valve 351 is opened during loading and unloading, air circulates in a closed loop consisting of the air discharge pipe 330, the capacity adjustment pipe 350, and the air suction pipe 300, thereby preventing the sound generated by the vacuum pump 320 from leaking into the inside of the casing 310 via the air suction pipe 300 and the capacity adjustment pipe 350.

[0047] In addition to circulating air in a closed loop consisting of the air discharge pipe 330, the idling pipe 360, and the air suction pipe 300, by circulating air in a closed loop consisting of the air discharge pipe 330, the capacity adjustment pipe 350, and the air suction pipe 300, there is no need to take air into the casing 310, and there is no need to provide the air intake 312 shown in Figures 1 and 3, so sound is less likely to leak to the outside, and noise is reduced.

[0048] Moreover, since the capacity adjustment pipe 350 is covered with soundproofing material 352, it is more effective in suppressing leakage of sound generated from the vacuum pump 320. It goes without saying that even if the capacity adjustment pipe 350 is not covered with the soundproofing material 352, the noise suppression effect can be expected.

[0049] Thus, in the second embodiment, noise can be further suppressed.

[0050] In the first and second embodiments, the idling pipe 360 ​​is covered with a soundproofing material 362. This configuration is more effective in preventing the sound generated by the vacuum pump 320 from leaking out of the idling pipe 360.

[0051] In the second embodiment, a capacity adjustment pipe 350 is branched from the air discharge pipe 330 and connected to the air suction pipe 300, and a capacity adjustment valve 351 is provided on the capacity adjustment pipe 350. With this configuration, even if the capacity adjustment valve 351 is opened to increase or decrease the amount of suction of the bulk material B during loading and unloading, air circulates in a closed loop consisting of the air discharge pipe 330, the capacity adjustment pipe 350, and the air suction pipe 300, so that the sound generated from the vacuum pump 320 is less likely to leak into the casing 310 through the air suction pipe 300 and the capacity adjustment pipe 350. In addition, the air intake 312 for taking in air into the casing 310 is not required, so sound leakage to the outside is further suppressed.

[0052] Furthermore, in the second embodiment, the capacity adjustment pipe 350 is covered with a soundproofing material 352. This configuration is more effective in preventing the sound generated by the vacuum pump 320 from leaking out of the capacity adjustment pipe 350.

[0053] Incidentally, the suction device of the pneumatic unloader of the present invention is not limited to the above-mentioned embodiment, and it is needless to say that various modifications can be made within the scope of the present invention without departing from the gist of the present invention. [Explanation of symbols]

[0054] 100 Pneumatic Unloader 200 Receiver Tank 210 Filter 300 Air suction tube 310 Casing 311 Soundproofing material 312 Air Intake 320 Vacuum Pump 321 Suction port 322 Discharge port 330 Air discharge pipe 340 Silencer 350 Capacity adjustment tube 351 Capacity control valve 352 Soundproofing material 360 Idling Pipe 361 Idling valve 362 Soundproofing material 400 Horizontal pipe 410 Pipe fittings 420 Vertical pipe 430 Bend Pipe 440 Suction Nozzle 500 Rotary Feeder B Loose items H port S ship S1 storage tank S2 Hatch W Quay

Claims

1. In a suction device of a pneumatic unloader equipped with a receiver tank that sucks up and discharges bulk materials stored on a ship, an air suction pipe connected to the receiver tank; a vacuum pump connected to the air suction tube; an air discharge pipe connected to the vacuum pump; an idling pipe branched from the air discharge pipe and connected to the air suction pipe; an idling valve provided in the idling pipe; A suction device for a pneumatic unloader equipped with the above.

2. 2. A suction device for a pneumatic unloader according to claim 1, wherein said idling pipe is covered with a soundproofing material.

3. a capacity adjustment pipe branched from the air discharge pipe and connected to the air suction pipe; a capacity adjustment valve provided in the capacity adjustment pipe; 3. The suction device of a pneumatic unloader according to claim 1 or 2, further comprising:

4. 4. The suction device for a pneumatic unloader according to claim 3, wherein said capacity adjustment pipe is covered with a soundproofing material.

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