JP2009061639A - Concrete mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete mixer equipped with ring members that are easy to work and can be formed inexpensively. <P>SOLUTION: The mixer is equipped with two rotary shafts having blades that can knead a ready-mixed concrete. On the outer periphery of the rotary shafts a plurality of ring members for preventing the adherence of the concrete are freely fitted. Each ring member is formed by combining four flat bars 11A, 11B, 11C, 11D that are obtained by the bending work of making a flat strip into a semicircular shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a concrete mixer capable of kneading ready-mixed concrete.

Conventionally, a concrete mixer having a structure as disclosed in Patent Document 1 exists.
Conventionally, a concrete mixer kneads cement, water, sand, gravel, and the like, and when the concrete adheres to the inside and hardens, the kneading action is weakened or mixed into the concrete as a large lump. Conventionally, since the inside of the concrete mixer is cleaned after the work is finished, the hardened concrete that cannot be removed is peeled off with a hammer or the like.
JP 2002-36229 A

  In the above-described conventional concrete mixer, in order to prevent the concrete from adhering to the rotating shaft of the concrete mixer, a measure is taken to provide a ring member on the outer periphery of the rotating shaft, but the ring member is engaged with the rotating shaft. For this purpose, it is divided into two parts, a notch or the like is formed in the connecting part, and the two parts are overlapped by the notch part. Alternatively, the bolt part is provided on one side of the divided ring member. And has a structure in which it is detachably coupled by a combination with a cap nut provided on the other side, which takes time to process the ring member and increases the cost of the ring member. .

  The present invention has been devised in view of the above-mentioned conventional problems, and provides a concrete mixer that can make a ring member for preventing adhesion of concrete to a rotating shaft of a concrete mixer simple and inexpensive, The claim 1 comprises two rotating shafts having blades capable of kneading ready-mixed concrete, and a plurality of ring members for preventing adhesion of concrete are loosely fitted on the outer periphery of each rotating shaft. It is formed by combining four flat bars obtained by bending flat strips into a semicircular shape.

  According to a second aspect of the present invention, each flat bar has a counterbore hole and a tapped screw hole alternately formed at predetermined intervals, and is overlapped on the back side with respect to the counterbore hole of the front flat bar. The ring member is formed by aligning the screw holes of the bar and tightening bolts from the counterbore hole side to the screw holes.

  The concrete mixer of the present invention includes two rotating shafts having blades capable of kneading ready-mixed concrete, and a plurality of ring members for preventing concrete adhesion are loosely fitted on the outer periphery of each rotating shaft. The ring member is formed by combining four flat bars obtained by bending a flat strip into a semicircle, so that the ring member can be formed inexpensively by bending the flat strip into a semicircle. A good ring member can be formed by combining the four flat bars thus formed, and the ring member can be made inexpensive without requiring complicated processing. It can be loosely fitted on the outer periphery to effectively prevent the concrete from adhering to the rotating shaft of the concrete mixer, and it is necessary to perform concrete peeling work with a hammer or the like. The Kunar thing.

  Further, each flat bar has counterbored holes and tapped screw holes alternately formed at predetermined intervals, and screw holes of the flat bar that are superimposed on the back side of the countersunk holes of the front side flat bar. And the ring member is formed by tightening the bolt from the counterbore hole side to the screw hole, so that the ring member is overlapped with the same shape of the flat bar on the front and back sides of the flat bar on the front side. By aligning the screw hole of the flat bar superimposed on the back side with the counterbore hole, and tightening the bolt from the counterbore hole side to the screw hole, the front and back flat bars can be connected well to form the ring member In addition, it is not necessary to perform complicated processing on the joint when the ring member is divided into two parts as in the prior art, and it becomes easy to manufacture the ring member and assemble it on the rotating shaft.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic plan view of a concrete mixer. The concrete mixer 1 has an openable concrete outlet (not shown) on the bottom surface, and the inside of the box-shaped box frame 2 with the top surface open. In addition, two first rotating shafts 3 and second rotating shafts 4 are rotatably provided in parallel, and the first rotating shaft 3 and the second rotating shaft 4 are outward at an angle of about 45 °. A plurality of protruding arms 5, 5, 5 are provided at intervals, and blades 6 are connected to the tips of the respective arms 5, and the rotating shafts 3, 4 are rotated. Sometimes, the trajectories of the plurality of blades 6 are set to be spiral (spiral).

A tuning gear 7a is connected to the first rotating shaft 3 outside the box frame 2, and a tuning gear 7b is connected to the second rotating shaft 4 outside the box frame 2. The gears 7a and 7b are meshed with each other, and the tuning gear 7a is connected to the sprocket 9a of the motor 9 via the chain 8. Power is transmitted via the chain 8 by the operation of the motor 9, and the tuning gears 7a and 7b. The first rotary shaft 3 and the second rotary shaft 4 are configured to rotate synchronously in opposite directions via the slab, and the cement, water, sand, and gravel are mixed well in the box frame 2. It is configured to be.
A plurality of ring members 10, 10, 10 are loosely fitted on the outer periphery of the first rotating shaft 3 and the second rotating shaft 4 of the concrete mixer 1. The inner diameter of the ring member 10 is set to, for example, about 1.3 to 2 times the diameter of the rotary shafts 3 and 4.

Each ring member 10 is formed by combining four semicircular flat bars 11 shown in FIG.
As shown in FIG. 2, each flat bar 11 is formed by bending a flat strip into a semicircle by a bender, and counterbore holes 13 and screw holes 12 are alternately formed at intervals. The counterbore hole 13, the screw hole 12, the counterbore hole 13, the screw hole 12, the counterbore hole 13, and the screw hole 12 are respectively provided from the left contact end surface 11a side to the right contact end surface 11b side. Is formed.
The screw hole 12 has a female thread formed on the inner periphery by tapping, and the counterbore hole 13 is subjected to counterbore processing, and a head portion 14a of a hexagonal hole bolt to be described later is fitted therein. The counterbore part which can be formed is formed.

A front view from the front side of the ring member 10 formed by superposing four flat bars 11 of FIG. 2 is shown in FIG. 3, and FIG. 4 is a side sectional view of FIG.
The exploded view before combining four identical flat bars 11 is as shown in FIG. 5. The front side is composed of a first flat bar 11A and a second flat bar 11B, and the back side is composed of a third flat bar 11C and a fourth flat bar. The flat bar 11D is configured so that the flat bars 11A and 11B are turned upside down on the front side so as to be opposed to each other, and the contact end surfaces 11a and 11b are horizontally arranged on the front side. 11D is arranged in a pair, and the contact end surfaces 11a and 11b are inclined with respect to the horizontal plane.
In such an arrangement, the contact end surfaces 11a and 11b of the first flat bar 11A and the second flat bar 11B on the front side are brought into contact with each other to form a ring shape, and the third flat bar 11C on the back side and the fourth flat are provided on the back side. When the bar 11D is overlapped in a ring shape with the contact end surfaces 11a and 11b contacting each other, the counterbore hole 13a of the first flat bar 11A and the screw hole 12a of the third flat bar 11C are aligned. Moreover, the screw hole 12b of the fourth flat bar 11D is aligned with the back side of the counterbore hole 13b of the second flat bar 11B.

As shown in FIG. 4, the hexagon socket head bolt 14 is inserted into the aligned counterbore hole 13a and the screw hole 12a from the counterbore hole 13a side, and the bolt portion 14b of the hexagon socket head bolt 14 is inserted into the screw hole 12a. When tightened, the head portion 14a of the hexagon socket head bolt 14 is fitted into the counterbore hole 13a, and the head portion 14a does not protrude outward, and the head portion 14a causes the arm 5 in the concrete mixer 1 to rotate. The shafts 3 and 4 are not damaged.
The hexagon socket head cap screw 14 is tightened in the field, and after the ring member 10 is loosely fitted to the outer periphery of the first rotary shaft 3 and the second rotary shaft 4, the bolt hole 14a is welded from the screw hole 12a side. The bolt part 14b can be fixed to the stopper to prevent it from coming off.

  In this way, the hexagon socket head bolt 14 is fastened to the aligned counterbore hole 13 on the front side and the screw hole 12 on the back side, and the four flat bars 11 having the same shape are firmly combined, and the first rotating shaft 3 and the second rotating shaft 4 can be formed with ring-shaped ring members 10, and each ring member 10 allows concrete to adhere to the first rotating shaft 3 and the second rotating shaft 4. It can be prevented well, and since there is no concrete that adheres to the rotating shafts 3 and 4 and hardens, there is no need to perform a conventional peeling operation using a hammer or the like.

  Thus, in this example, the ring member 10 can be formed satisfactorily by combining four flat bars 11 obtained by bending a flat strip into a semicircular shape, and the outer circumferences of the rotary shafts 3 and 4 of the concrete mixer on site. It is possible to assemble the ring member 10 satisfactorily, and it is not necessary to form any joints such as notches on the contact end surfaces 11a and 11b of each flat bar 11, and each flat bar 11 Since it can be formed at low cost, the cost is reduced, and the assembly work of the ring member 10 and the like can be easily performed.

It is a plane schematic block diagram of a concrete mixer. It is a front block diagram of the semicircle flat bar which comprises a ring member. It is a front lineblock diagram of a ring member formed combining four flat bars. It is a partial cross section side view lineblock diagram of FIG. It is an exploded block diagram before combining a pair of front side flat bar and a pair of back side flat bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete mixer 2 Box frame 3 1st rotating shaft 4 2nd rotating shaft 5 Arm 6 Blade | wing 7a, 7b Tuning gear 8 Chain 9 Motor 10 Ring member 11, 11A, 11B, 11C, 11D Flat bar 11a, 11b Contact end surface 12, 12a, 12b Screw hole 13, 13a, 13b Counterbore hole 14 Hexagon socket head bolt 14a Head 14b Bolt part

Claims (2)

  Two rotating shafts having blades capable of kneading ready-mixed concrete are provided, and a plurality of ring members for preventing concrete adhesion are loosely fitted on the outer periphery of each rotating shaft. A concrete mixer characterized by being formed by combining four flat bars bent into a circular shape.   Each flat bar has counterbored holes and tapped screw holes alternately formed at predetermined intervals, and aligns the screw holes of the flat bar that are superimposed on the back side with the countersunk holes of the flat bar on the front side. The concrete mixer according to claim 1, wherein the ring member is formed by tightening a bolt into a screw hole from a counterbore hole side.

Images