JP3375014B2 - Sludge collection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge recovery apparatus for recovering sludge by centrifuging a waste liquid containing solid particles such as paint particles discharged from a coating booth. . 2. Description of the Related Art For example, as shown in FIG.
Paint mist generated in the coating room 2 of the first cleaning liquid (cleaning water) when passing through the venturi section 3 by downflow
And is stored in the exhaust processing chamber 4. A killer agent is added to the waste liquid containing solid particles such as paint particles stored in the exhaust processing chamber 4, and the paint particles float as sludge S on the liquid surface in a state where the adhesive force is greatly reduced. Is done. This sludge S is collected in an external sludge collection tank T using a collection device 6 (suction port 7, discharge pipe 8, pump 9, etc.).
To be housed. Here, the sludge S contained in the sludge collection tank T contains a large amount of liquid (water) (for example, a water content of 90%) and has a very large volume, so that a large number of sludge collection tanks T are required. It takes much time for transportation and disposal. Therefore, a sludge collecting device capable of collecting the sludge S discharged from the coating booth 1 by drastically reducing the water content by centrifugation is often used. For example, in a sludge collecting apparatus (10P) disclosed in Japanese Utility Model Laid-Open Publication No. 53-109868, a drum 11, a discharge blade 21, a rotation driving device 31, a stopper portion 41, and a device main body frame 19 are arranged as shown in FIG. The sludge is centrifuged to deposit sludge on the drum inner surface 11i, and the sludge can be scraped and collected. The sludge recovered in this way has a low water content (for example, 20 to 60%) and does not take up a volume, so that disposal is easy. More specifically, the drum 11 has a lower opening 1
2, and is rotatably held on a substrate 19B of an apparatus body frame 19 via a holder 16 and a hollow main shaft 15 rotatably held by the holder 16 around a rotation axis 15a. A clean water extraction port 14 is provided in a portion of the upper cover 13 of the drum 11 near the main shaft 15. The discharge blade 21 has a plurality of (here, two) blade portions 22 and is rotatably housed in the drum 11 via a blade shaft 25 about the rotation axis 15a. ing. The blade shaft 25 is inserted into the main shaft 15 via a bearing 26 so as to be relatively rotatable. [0007] The rotation driving device 31 includes a driving motor 3
2 and the power transmission mechanism 35 (the pulleys 36 and 37 and the belt 38), the drum 11 and the discharge blade 21 can be simultaneously rotated in the same direction, and the rotation of the discharge blade 21 is stopped when the drum 11 is stopped by the stopper 41. It is configured to allow independent manual rotation. When the rotary drive device 31 is driven to rotate the main shaft 15, the blade shaft 25 follows and rotates at the same rotational speed in the same direction by the frictional force generated between itself and the main shaft 15 due to its own weight and the characteristics of the bearing 26 itself. The stopper portion 41 includes a locking portion 42 provided with a slit groove 43 provided on the upper lid 13 of the drum 11,
A stopper rod 44 is provided on the substrate 19B of the apparatus body frame 19 so as to be able to protrude and retreat with respect to the slit groove 43. When the stopper rod 44 is manually operated and is projected downward, the drive motor 32 The limit switch 45 inserted in the power supply circuit (not shown) is turned off, the drive motor 32 is disabled, and the stopper rod 44
And the slot 43 is locked, and the drum 11 is forcibly stopped. In FIG. 4, reference numeral 17 denotes a nozzle,
Dirty water (sewage) can be supplied to the inside of the drum 11 through the lower opening 12. This nozzle 17
Is connected to a waste liquid supply pipe 18, and the waste liquid supply pipe 18 is provided with a waste liquid supply valve 18V of an electromagnetic opening / closing type. Sludge discharged from the coating booth 1 and the like is sent to the drum 11 through the waste liquid supply pipe 18. In order to recover sludge using the apparatus 10P, first, a centrifugal separation step is performed for a predetermined time (for example, 60 minutes).
Minute) do. That is, the drive motor 32 is driven to simultaneously rotate the drum 11 and the discharge blade 21 in the same direction, and the waste liquid supply valve 18V is opened to discharge the waste liquid (dirty water) to the drum 1.
Supply within 1. Then, the waste liquid supplied into the drum 11 rotates in the same direction as the drum 11, and the paint particles and the like are separated from the liquid (water) component by the centrifugal force and strongly pressed against the inner surface 11 i of the drum 11, and the water content is low. It is deposited in a cake form as sludge (S) (see FIG. 5A). The sludge S deposited in the form of a cake is not uniform in moisture content, and has the lowest moisture content in the outer layer portion, and has a higher moisture content toward the inner layer (for example,
(The water content in the outer layer is 20%, the water content in the middle layer is 45%, and the water content in the inner layer is 60%). A liquid component (cleaning liquid) separated and purified from the paint particles passes through a clean water extraction port 14 provided in the upper lid 13 of the drum 11 and an internal passage 19A, and the discharge pipe 4
8 to the outside. Next, the discharging step is performed for a predetermined time (for example, 10 minutes).
Minute) do. That is, the rotation of the drum 11 is stopped by manually operating the stopper portion 41, and in this state, a handle (not shown) is attached to the engagement corner 28 formed at the tip of the blade shaft 25, and the rotation is performed manually. As a result, the low water content sludge (S) is scraped out of the inside of the drum 11 by the discharge blade 21 and falls into the lower sludge accommodating cart 49 through the lower opening 12 of the drum 11 (see FIG. 5B). By the way, in the above-mentioned conventional sludge collecting apparatus 10P, when the discharge blade 21 scrapes out the sludge (S) deposited on the drum inner surface 11i,
A force that resists scraping from the sludge (S) acts on each blade portion 22 of the discharge blade 21. In particular, the outermost layer of the sludge (S) is strongly pressed against the drum inner surface 11i and is solidified, so that the above-mentioned resistance is large. As a result, an excessive force acts on the side end of each blade 22 of the discharge blade 21, and there is a possibility that the blade 22 is damaged or abnormally deformed. Moreover, there is a possibility that an overload acts on the drive motor 32 of the rotary drive device 31 to cause burnout or the like. In view of the above circumstances, an object of the present invention is to provide a sludge collecting apparatus capable of smoothly scraping sludge accumulated on the inner surface of a drum without damaging a discharge blade. A sludge recovery apparatus according to the present invention includes a drum and a discharge blade rotatably accommodated in the drum and having at least two blade portions. The discharge blades are rotated simultaneously in the same direction about the same rotation axis to centrifuge the waste liquid containing solid particles supplied into the drum, and the discharge blades are capable of accumulating sludge on the inner surface of the drum and stopping the drum. In the sludge collecting apparatus configured to be able to scrape sludge from the inside of the drum by rotating, a plurality of notches are arranged at the side end of each of the blades of the discharge blade so as to be displaced in the rotation axis direction. Features. In the present invention according to the above construction, a plurality of notches are provided at the side end of each blade of the discharge blade.
The contact area between the side end of each blade and the sludge deposited on the inner surface of the drum is smaller than that of the conventional example because of the cutout. As a result, when the sludge is scraped out, the resistance acting on the blades of the discharge blade from the sludge does not become excessive, and damage to the blades and the like is prevented. At this time, since the notches of the blades of the discharge blade are displaced in the direction of the rotation axis, the sludge is not scraped off, and the entire sludge is securely transferred to the inside of the drum. Can be scraped from. Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the present sludge collecting apparatus has the same basic configuration as that of the conventional example (FIG. 4), but has a plurality of notches 24 at the side end 23 of each blade 22 of the discharge blade 21. The blades 22 are provided so as to reduce the resistance acting on the blades 22 from the sludge when the sludge is scraped out, thereby preventing the blades 22 from being damaged. Note that the same components as those in the conventional example (FIG. 4) are denoted by the same reference numerals, and description thereof will be simplified or omitted. First, the discharge blade 21 includes a plurality of (two in this embodiment) blade portions (22, 2) mounted on the blade shaft 25.
2). As shown in FIG. 2, a plurality of cutouts 24 are provided at a side end 23 of each blade 22.
Are displaced in the direction of the rotation axis 25a. The rotation axis 25 a of the blade shaft 25 is the rotation axis 1 of the main shaft 15.
Same as 5a. In particular, in this embodiment, each notch 24
It is formed in a character shape. Each notch 24 of each blade 22 has a predetermined pitch P along the rotation axis 25a.
The respective notches 24 on the left side and the respective notches 24 on the right side in FIG. 2 are displaced by a half pitch (P / 2). By rotating the blade shaft 25, cake-like sludge (paint sludge) deposited on the inner surface 11 i of the drum is discharged from the side end 23 of each blade 22 of the discharge blade 21.
It can be scraped out in a state where the resistance is further reduced. In this embodiment, as shown in FIG. 1, the discharge blade 21 is driven to rotate by a discharge blade driving device 51, and the stopper rod 44 of the stopper portion 41 is projected and retracted by a driving cylinder device 46. The discharge blade driving device 51 includes an engagement cap 5
2, cap elevating unit 53 and cap rotation driving unit 62
The engaging cap 52 is lowered from a position (standby position P1) shown by a solid line in FIG. 1 to be connected to the engaging corner 28 formed at the tip of the discharge blade 21 and is rotatable in that state.
Further, it is formed so as to be lifted to release the connection with the engagement corner portion 28. More specifically, the cap elevating portion 53 includes an elevating shaft 54, a connecting member 55, and an elevating cylinder 57, and lowers and raises the engaging cap 52 to set the standby position P1 and the engaging corner of the discharge blade 21. It is configured to be capable of selectively positioning and holding at a connection position P2 connected to the connection position. The elevating shaft 54 has a lower end connected to the engaging cap 52 and an upper end rotatably connected to the engaging portion 56 of the connecting member 55 via a bearing or the like about the axis 54a. Have been. Both ends of the connecting member 55 are held by the piston rods 57a of the lifting cylinders 57 so as to be able to move up and down. The lift cylinder 57 is configured to be supplied with air from an air supply source (not shown) via an air switching valve or the like so that the piston rod 57a can protrude and retreat. Therefore, when each of the lifting / lowering cylinders 57 is driven to retreat (down) the piston rod 57a, the engagement cap 52 is lowered from the standby position P1 to the connection position P2.
Is held. In that state, each lifting cylinder 5
When the piston rod 57a of No. 7 is protruded (raised), the engaging cap 52 is raised and positioned and held at the standby position P1. The cap rotation drive section 62 includes a hollow power transmission shaft 63, a drive motor 65, and a belt transmission mechanism 66, and connects the engagement cap 52 to the axis 54 of the elevating shaft 54.
It is configured to be rotatable around a. The power transmission shaft 63 transmits rotational power to the elevating shaft 54, and is formed so that the elevating shaft 54 can be relatively moved in the direction of the axis 54a and cannot be relatively rotated. The power transmission shaft 63 is rotatably provided on a substrate 19C of the apparatus main body frame 19 via a holder 64, and includes a drive motor 65 and a belt transmission mechanism 66 (pulley 6).
7A, 67B, and a belt 67C). Accordingly, when the drive motor 65 is driven, the engagement cap 52 is rotated via the belt transmission mechanism 66, the power transmission shaft 63, and the elevating shaft 54 while being allowed to move up and down. In this embodiment, in order to perform the scraping of the paint sludge more smoothly, in the direction opposite to the rotation of the drum 11 in the residual sludge softening step, the engagement cap 52 is connected to the blade shaft 25 during the residual sludge discharging step. The drive of the drive motor 65 is controlled so as to rotate. Next, the operation of this embodiment will be described. Since a plurality of cutouts 24 are provided at the side end 23 of each blade 22 of the discharge blade 21, contact between the side end 23 of each blade 22 and paint sludge accumulated on the drum inner surface 11i is achieved. The area is smaller than that of the conventional example by the amount of each notch 24. As a result, the resistance acting from the paint sludge on each of the blade portions 22 of the discharge blade 21 at the time of scraping out the paint sludge does not become excessive, and damage to the blade portions 22 and the like is prevented. At this time, each notch 24 of each blade portion 22 of the discharge blade 21 has a half pitch (P / P) in the direction of the rotation axis 25a.
2) Because of the misalignment, the entire paint sludge can be scraped out of the drum 11 without causing the paint sludge that is not scraped. According to this embodiment, a plurality of cutouts 24 are formed at the side end 23 of each blade 22 of the discharge blade 21.
Are arranged so as to be displaced in the direction of the rotation axis 25a, so that the resistance force applied from the paint sludge to the side end 23 of each blade portion 22 of the discharge blade 21 at the time of scraping the paint sludge can be greatly reduced. As a result, the load on each blade portion 22 of the discharge blade 21 can be greatly reduced, and damage to the discharge blade 21 and the like can be prevented. Further, each notch 24 of each blade portion 22 of the discharge blade 21 is provided with a rotation axis 25.
Since the positions are shifted by a half pitch (P / 2) in the direction a, the paint sludge deposited on the inner surface 11i of the drum can be scraped out evenly. In the above embodiment, the cutouts 24 of the blades 22 of the discharge blade 21 are displaced by a half pitch (P / 2) in the direction of the rotation axis 25a.
If the sludge deposited on the inner surface 11i of the drum 11 can be scraped off evenly by the rotation of the first rotation, the above-mentioned displacement amount becomes half a pitch (P
/ 2) can be selected as appropriate. In addition, each notch 2
4 may be arranged at irregular intervals without being arranged at regular intervals. Although the discharge blade 21 has a configuration having two blade portions 22, the number of blade portions (22) is not limited to this, and can be appropriately selected (for example, three). Side ends (23) of the appropriately selected blades (22)
If the plurality of cutouts (24) are displaced in the rotational direction along the rotation axis (25a), breakage of each blade (22) can be prevented in the same manner as described above. Further, the present sludge collecting apparatus is applied to a case where sludge is collected from a waste liquid containing paint particles and the like discharged from a coating booth, but the sludge is recovered from a waste liquid containing solid particles other than the paint particles. Of course, it is also possible to apply when collecting. According to the present invention, a plurality of cutouts are arranged at the side end of each blade of the discharge blade so as to be displaced in the direction of the rotation axis, so that the discharge blade may be damaged. Sludge accumulated on the inner surface of the drum can be scraped out smoothly and reliably without causing the sludge to accumulate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an overall configuration of an embodiment of the present invention. FIG. 2 is a view for explaining a notch formed in each blade of the discharge blade. FIG. 3 is a diagram illustrating a state in which paint sludge discharged from a painting booth is collected. FIG. 4 is a view for explaining a conventional configuration of a sludge collection device. FIG. 5 is a view for explaining the accumulation and discharge of sludge. [Description of Signs] 10 Sludge device 11 Drum 21 Discharge blade 22 Blade portion 23 Side end 24 Notch

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-53-18060 (JP, A) JP-A-52-98266 (JP, A) JP-A-48-104153 (JP, A) JP-A 50-98 459 (JP, A) JP-A-56-152533 (JP, A) JP-A-53-109868 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B04B 11/08 B04B 1 / 02

Claims (1)

(1) A drum and a discharge blade having at least two blade portions housed in the drum, wherein the drum and the discharge blade are arranged around the same rotation axis. Dirty liquid containing solid particles supplied to the drum by centrifugal rotation in the same direction is centrifuged, sludge can be deposited on the inner surface of the drum, and the discharge blades are rotated with the drum stopped, and the sludge is scraped out of the drum In a sludge collecting apparatus that is configured to be capable of being disposed, a plurality of notches are displaced in the rotation axis direction at a side end of each blade of the discharge blade.