JPH0472080B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is a method for cutting, crushing, and pumping solids mixed in liquid in sewage treatment plants, etc. This relates to a cutting blade adjustment device for a crushing pump.

(Prior Art and Problems to be Solved) Generally, this type of crushing pump includes a crushing impeller that is fixed to a rotating shaft and rotates in the flow path, and a crushing impeller that is close to the rear side of the flow path. a fracture lattice;
A cutting blade is provided close to the front side of the flow path. Conventionally, a cutting blade adjustment device for adjusting the distance between this cutting blade and the crushing impeller has a cutting blade as shown in Fig. 3. The cylindrical body 70 of the blade 69 is inserted into the suction case 5
A bolt 73 is provided on the outer end surface of the body 70 and is slidably fitted diagonally into the body 70 and engages with an axial groove 71 provided in the body 70 to lock rotation of the body 70. Threaded cylinder 8 screwed into first screw 87 that projects integrally
A second screw 91 is provided on the outer periphery of the second screw 9, and an engaging portion 93 for engaging a tool is provided on the outer peripheral end of the second screw 9.
1 is screwed together and fixed to the suction case 5.
A cap nut 85 is provided which is screwed onto the second screw 91 and abuts against the threaded cylinder 89.

For adjustment, loosen the bolt 73, remove the cap nut 85, engage the tool with the engaging part 93,
When the threaded cylinder 89 is rotated, since the pitch of the second screw 91 is larger than the pitch of the first screw 87, the cutting blade 69 moves obliquely in a direction away from the crushing impeller 13 by the pitch difference. When the threaded cylinder 89 is rotated in the opposite direction, it moves in the closer direction, and the distance between the cutting edges 69 is adjusted.

This conventional configuration had the following drawbacks. That is, (1) since the first screw is formed to protrude integrally with the cutting blade, the same expensive material as the cutting blade is used, resulting in high material costs. (2) Machining of a threaded cylinder with internal and external threads is difficult and the structure becomes complicated. (3) Since the screw cap nut is in contact with the screw tube, the second screw with a larger pitch is not fixed.
There is a lot of play in the cutting blade when loosening the bolt. (4) Since the first screw and the second screw are arranged on both sides of the engaging portion that engages the tool, there is a risk of damaging the screw when the tool comes off.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a second screw at the outer peripheral end of an adjustment bolt that is screwed into the outer end surface of the body of the cutting blade by a first screw; an engaging portion for engaging a tool at the outer end;
It has a lid that is screwed into the suction case and fixed to the suction case, and a cap nut that is screwed into the second screw and comes into contact with the lid. After removing the cap nut and loosening the bolt, it is engaged. When a tool is engaged with the part and the adjustment bolt is rotated, the cutting blade moves by the difference in pitch between the second screw and the first screw, allowing fine adjustment of the distance between the cutting blades.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, the crushing pump 1 is constructed as follows. That is, the pump case 2 is formed by fixing a suction case 5 to one side of a main body case 3 via an intermediate case 7. That is, the intermediate case 7 is fixed to the main case 3 by bolts 9, and the suction case 5 is attached to the intermediate case 7 with the crushing grid 1.
1 and an outer ring 15 provided at an appropriate distance on the outer periphery of a rotating crushing impeller 13 facing the crushing grid 11 with an appropriate distance between them. A discharge port 19 is provided in the upper direction of the main body case 3 perpendicular to the suction case 5, and the dirty water sucked from the suction case 5 passes through the main body case 3 from the suction passage 21 and is discharged to the outside from the discharge passage 23. be done. In the discharge passage 21, a crushing impeller 13 is fixed to a rotating shaft 25 with a key 27 and a bolt 29, and in the main body case 3, a discharge impeller 31 is locked to a key 33 and the crushing impeller 13 bolt 2 through
It is fixed by 9. An annular adjusting body 35 that faces the discharge impeller 31 with an appropriate distance is provided on one axial side surface of the main body case 3 and is movable in the axial direction. They are sealed in between by seals 37 and 39, respectively. An annular screw body 41 is fitted to the outer periphery of the outer ring 15 between the intermediate case 7 and the suction case 5 so as to be able to reciprocate in the axial direction, and a bolt passes through the intermediate case 7 in an axially movable manner. 43, it is integrally fixed to the adjusting body 35. An annular handle 47 is rotatably engaged with the outer periphery of the screw body 41 through a threaded portion 45, and by rotating the handle 47, the adjustment body 35 is reciprocated in the axial direction. It is. At the center of the outer surface of the main body case 3, an oil seal 49 made of cloth-filled oil-resistant rubber is installed on the inside, an oil seal 51 with a regular rubber lip is installed on the outside, and a felt filler 53 is installed in the middle. A grease nipple 55 is used to fill the gap between the shaft and the rotary shaft 25 with grease to prevent foreign matter from entering.A wear-resistant sleeve 57 is fitted around the outer periphery of the rotating shaft 25 to prevent wear and tear on the outer periphery of the sleeve 57. A wear-resistant material 59 such as ceramic is thermally sprayed on easily exposed parts. Rotating shaft 25
is rotatably supported via bearings 63 and 65 by a bearing case 61 that is integrally fixed to the main body case 3, and has a flange 67 for power transmission fixed to the end thereof. A blade portion 68 is formed on the front edge of the crushing impeller 13, and corresponds to a cutting blade 69 provided close to the suction side to crush large solids. The rotation of the cutting blade 69 is locked by a bolt 73 that locks into an axial groove 71 formed in a cylindrical body 70 that fits into the suction case 5 so as to be able to swing freely obliquely. Torso 70
A second screw 79 having a larger pitch than the first screw 75 is provided on the adjustment bolt 77 which is screwed into the outer end surface of the suction case by a bolt 83. It is fixed to 5. A cap nut 85 screwed into the second screw 79 is provided as a lock nut in contact with the lid portion 81. An engaging portion 86 for engaging a tool is provided at the outer end of the adjusting bolt 77.

In the above embodiment, when the drive device is operated, the rotating shaft 2 rotates via the flange 67, and the liquid is sucked from the suction passage 21 of the suction case 5 by the rotation of the crushing impeller 13 and the discharge impeller 31. The liquid then passes through the main body case 3 and is discharged from the discharge passage 23 to the outside. The solids mixed into the liquid are removed by the cutting blade 69.
The solid matter that has passed through the crushing impeller 13 is crushed between the front edge of the crushing impeller 13 and the crushing impeller 13.
It is further crushed into fine pieces between the trailing edge of the crushing grid 11, passes through the crushing grid 11, and is discharged to the outside via a discharge path 23 by a discharge impeller 31. For example, if the water level in the sewage treatment tank is high and the flow rate of the pump becomes excessive, the crushing capacity of the pump will be insufficient, and the solids that are insufficiently crushed will be deposited on the discharge impeller 31 and the inner wall surface of the main body case 3 (in this embodiment, the regulator 35). In this case, the handle 47 can be turned to move the adjusting body 35 to the left in Fig. 1 to widen the gap. The clogged solid matter is removed as the discharge impeller 31 rotates. If the flow rate of the pump is expected to be excessive, operating the handle 47 in advance to widen the distance between the regulator 35 and the discharge impeller 31 will prevent solids from clogging. It is also possible to ensure normal operation.

When adjusting the distance between the cutting blades, use the cap nut 8.
5, loosen the bolt 73, and insert the tool into the engaging part 8.
6 and rotates the adjustment screw 77, the cutting edge 69 is adjusted by the difference in pitch between the first screw 75 and the second screw 79.
can be moved to finely adjust the distance between the crushing impeller 13 and the crushing impeller 13.

[Effects of the Invention] According to the present invention, the following effects are obtained. (1) Since the adjustment screw is provided separately from the cutting blade, the cost is reduced because the same expensive material as the cutting blade is not used. (2) The adjustment screw is easy to process because it has a thread machined on its outer periphery. (3) Since the screw cap nut is in contact with the lid, the second screw with a larger pitch is fixed, and when the bolt is loosened, the play of the cutting blade is reduced, and when the bolt is tightened again, The error between cutting edges is small. (4) Since there is no screw on the outside of the engaging part that engages the tool, there is less chance of damaging the screw when the tool comes off.

In addition, FIG. 3 shows a conventional example, and FIG.
The same reference numerals as those shown in FIG. 2 represent the same components.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a fracturing pump equipped with a device according to the present invention, FIG. 2 is a side sectional view of an embodiment of the present invention, and FIG. 3 is a side sectional view of a conventional example. 5...Suction case, 11...Crushing grid, 13...
... Crushing impeller, 25 ... Rotating shaft, 69 ... Cutting blade,
70...body, 71...groove, 73...bolt,
75...first screw, 77...adjustment bolt, 79...
...Second screw, 81...Lid, 85...Cap nut,
86...Engagement part.

Claims (1)

[Claims] 1. A crushing impeller 13 that is fixed to a rotating shaft 25 and rotates in the flow path, a crushing grid 11 that is close to the side surface of the crushing impeller 13 on the rear side of the flow path, and a cutter that is close to the side surface of the front side of the flow path. In the crushing pump provided with a blade 69, a cylindrical body part 70 of the cutting blade 69 is slidably fitted diagonally into the suction case 5, and the body part 7
A bolt 73 is provided that fits into an axial groove 71 provided at 0 to lock rotation of the body 70, and an adjustment bolt is screwed into the outer end surface of the body 70 by a first screw 75. A second screw 79 is provided at the outer peripheral end of 77, and an engaging portion 86 for engaging a tool is provided at the outer end,
A lid part 81 is screwed onto the second screw 79 and fixed to the suction case 5, and a cap nut 85 is screwed onto the second screw 79 and abuts on the lid part 81. A cutting blade adjustment device for a crushing pump.