JP2006298031A - Agitation device of mixer truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agitation device of a mixer truck surely preventing the vicinity of the central part of the rear side of a drum from being solidified. <P>SOLUTION: The agitation device is equipped with a center shaft 14 provided on the central axis A from the front end part of the drum 3 to the rear part, a support member 13 which is connected to the center shaft 14, and fixed to blades 10, 11 at both ends parts extending to the radial direction, and a back flow paddle (agitating member) 12 (generic names from 12a to 12j) provided inwardly than the inner peripheral end of the blades 10, 11. Since the center shaft 14 for originally supporting the back flow paddle 12 is supported from the drum side by the support member 13 with the configuration, the center shaft 14 reaching the rear part of the drum 3 can be firmly supported and freshly mixed concrete in the drum including the vicinity of the central part of the rear side of the drum 3 can be agitated by the support member 13 mounted to the center shaft 14 and the back flow paddle 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mixer truck that transports ready-mixed concrete, and more particularly to a stirring device for the mixer truck.

The drum mounted on the body of the mixer truck is supported in a rotatable manner in an oblique posture with the ready-mixed concrete outlet facing upward. The drum is a container for raw concrete and a stirring device, and a spiral blade is provided on the inner wall thereof. Further, a center shaft is provided on the central axis from the front end of the drum, and a stirring arm is attached to the center shaft in the radial direction (see, for example, Patent Document 1). The center shaft is supported separately from the drum, and is configured to perform a short stroke piston motion in the axial direction and a swivel motion associated therewith.
When the ready-mixed concrete is charged and stirred and kneaded, the drum rotates in a predetermined direction and the blade stirs while feeding the ready-mixed concrete obliquely downward. The arm also stirs the ready-mixed concrete near the center of the drum. On the other hand, when the drum is rotated in the reverse direction, the blade scoops up the ready-mixed concrete and discharges it from the discharge port.

Japanese Examined Patent Publication No. 3-63483 (FIG. 1)

In the agitator for a conventional mixer truck as described above, the center shaft is in a state where only one end is supported by the front end portion of the drum, and the tip thereof is a free end. Therefore, when a load due to stirring is applied, the center shaft may bend and the arm may come into contact with the blade. Therefore, the center shaft is shorter than half the axial length of the drum. In the arm attached to such a short center shaft, the vicinity of the rear center portion of the drum cannot be stirred, and as a result, the ready-mixed concrete may solidify.
In view of the above-described conventional problems, an object of the present invention is to provide an agitator for a mixer truck that reliably prevents the vicinity of the rear center portion of the drum from solidifying.

The mixer vehicle agitator according to the present invention includes a drum mounted on a vehicle body and rotatably supported around a central axis, and a blade provided in a spiral shape around the central axis on the inner wall of the drum. A center shaft provided on a central axis from the front end portion to the rear portion of the drum, and connected to the center shaft and extending in a direction intersecting with the center shaft, and both end portions thereof are on the inner wall side of the drum. A fixed support member and a stirring member supported by the center shaft and provided inward from the inner peripheral end of the blade are provided.
In the mixer stirring apparatus configured as described above, the center shaft for supporting the stirring member is supported from the drum side by the support member. Therefore, the center shaft reaching the rear part of the drum can be firmly supported, and the ready concrete in the drum including the vicinity of the rear center part of the drum can be agitated by the supporting member and the agitating member attached thereto.

Further, in the above stirring device, the plurality of stirring members may be arranged along the spiral shape of the blade, and may be a backflow paddle inclined in the direction opposite to the blade with respect to the central axis of the drum when viewed from the side.
In this case, the ready-mixed concrete inside the blade is fed in the direction opposite to the feeding direction by the blade by the rotating backflow paddle. Thereby, the ready-mixed concrete circulates without staying in the drum, and is always stirred and kneaded. Therefore, solidification of the ready-mixed concrete in the drum can be prevented.

Further, in the stirring device, the stirring member may be fixed to the support member.
In this case, the support member serves not only as the support for the center shaft but also as the support member for the stirring member, which contributes to a reduction in manufacturing cost.

  According to the stirring apparatus for a mixer car of the present invention, since the center shaft for supporting the stirring member is supported from the drum side by the support member, the center shaft reaching the rear part of the drum can be firmly supported, The ready-mixed concrete in the drum including the vicinity of the rear center portion of the drum can be stirred by the support member and the stirring member attached thereto. Accordingly, it is possible to provide a mixer vehicle stirring device that reliably prevents solidification even in the vicinity of the rear center portion of the drum.

  FIG. 1 is a side view (port side) of a mixer truck including a stirring device according to an embodiment of the present invention. In the figure, the mixer vehicle 1 includes a vehicle body 2 and a drum 3. The drum 3 is rotatably supported around the central axis A by support devices 4 and 5 provided before and after the vehicle body 2. The drum 3 can be reversibly rotated by a driving device (not shown) based on engine power. In addition, a discharge port 3a (input port) for inputting and discharging ready-mixed concrete is provided behind the drum 3.

  FIG. 2 is a view of the mixer truck 1 as viewed from the rear, and a hopper 6 for putting ready-mixed concrete is provided at the upper rear part of the discharge port 3a. In addition, a scoop 7 and a chute 8 are provided below the discharge port, and the ready-mixed concrete discharged from the discharge port 3a is guided to the chute 8 by the scoop 7, and further discharged in a predetermined direction by the chute 8. Is done.

  Next, the structure of the stirring device in the drum 3 will be described in detail. FIG. 3 is a cross-sectional view showing a schematic structure of the drum 3 as viewed from the starboard side. FIG. 6 is a schematic view of the internal structure of the drum 3 as viewed from the axial end side of the central axis A thereof. In FIG. 3, two blades 10 and 11 having a spiral shape around a central axis A are fixed on an inner wall 3 b of the drum 3. What is shown is a fragment of half the circumference of each blade 10, 11, and each fragment is connected one by one in the direction of the central axis A.

  In FIG. 3, the center shaft 14 is provided on the central axis A from the front end of the drum 3 when the right side of the central axis A of the drum 3 is the front and the left is the rear. The rear end of the center shaft 14 exceeds the middle position in the central axis direction of the drum 3 and reaches the rear part (in this example, about 3/4 of the length in the central axis direction from the front end part). However, the center shaft 14 is not extended to the vicinity of the discharge port 3a.

A total of five support members 13 are attached to the center shaft 14 alternately 90 degrees in the circumferential direction and with the attachment direction shifted (see FIG. 6). Each support member 13 penetrates the center shaft 14 in the radial direction, and is connected and fixed to the center shaft 14. The two rear support members 13 are each extended in a direction (radial direction) orthogonal to the center shaft 14, one end of which is welded (or bolted) to the blade 10 and the other end to the blade 11. It is fixed by. In this way, the two support members 13 are installed between the pair of blades 10 and 11. The three front support members 13 extend in a direction (radial direction) perpendicular to the center shaft 14 but do not reach the blades 10 and 11.
The center shaft 14 and the support member 13 are formed of a pipe-like member, but may be a round bar (solid), a square pipe, a square bar, or the like.

  In the vicinity of both ends of each support member 13, a backflow paddle (stirring member) 12 (general reference numeral 12, individual reference numerals 12 a to 12 j) which is a rectangular single plate member, and 12 a, 12 b, 12 d, 12 e, 12 g 12h and 12i are attached to FIG. 3, 12a to 12e are attached to FIG. 4, and 12f to 12j are attached to FIG. With respect to the two rear support members 13, the backflow paddles 12 (12 a, 12 b, 12 f (FIG. 5), 12 g) protrude inward from the inner peripheral ends of the blades 10, 11 slightly before both ends. It is fixed by welding (or bolting) in the state. Further, the back support paddles 12 (12 c (FIG. 4), 12 d, 12 e, 12 h, 12 i) are located inward from the inner peripheral ends of the blades 10, 11 at the both ends of the three front support members 13. In addition, the blades 10 and 11 are fixed by welding (or bolting) apart from the blades 10 and 11. In addition, as a method of attaching the backflow paddle 12 to the support member 13, for example, the support member 13 is formed such that a hole corresponding to the end face shape of the backflow paddle 12 or a part of the shape is extracted in the diameter direction. A single plate-like backflow paddle 12 is passed through and welded or bolted. Accordingly, the backflow paddle 12 can be easily attached to the support member 13.

As is apparent from attention to part B in FIG. 3, each backflow paddle 12 is attached to the central axis A of the drum 3 so as to be inclined reversely with respect to the center axis A of the drum 3. Further, a plurality of backflow paddles 12 are arranged along the spiral shape of the blades 10 and 11 (here, 5 per blade). However, the support member 13 and the backflow paddle 12 are not provided in the vicinity of the discharge port 3 a of the drum 3.
The backflow paddle 12, the support member 13, and the center shaft 14 together with the drum 3 constitute a ready-mixed concrete stirring device in the mixer truck.

4 is a cross-sectional view in which the blade 11 and the backflow paddle 12 provided along the blade 11 are omitted from FIG. 3, and the blade 10 and the backflow paddle 12c on the front side of the cross section are indicated by a two-dot chain line. Is. When viewed along the spiral shape of the blade 10, a plurality of (here, five) backflow paddles 12a, 12b, 12c, 12d and 12e are provided.
Similarly, FIG. 5 is a cross-sectional view in which the blade 10 and the backflow paddle 12 provided along the blade 10 are omitted from FIG. 3, and the blade 11 and the backflow paddles 12f and 12j on the front side of the cross section are further divided into two. This is indicated by a dotted line. When viewed along the spiral shape of the blade 11, a plurality of (here, five) backflow paddles 12f, 12g, 12h, 12i and 12j are provided.

  Next, operation | movement of the stirring apparatus comprised as mentioned above is demonstrated. When the ready-mixed concrete is charged into the drum 3 and stirred and kneaded, the drum 3 is driven forward. The normal rotation is a clockwise rotation when viewed from the right end side of the central axis A in FIG. Assuming that the ready-mixed concrete has entered the level L indicated by the two-dot chain line in the figure, the above-described normal rotation causes the raw concrete in the range from the lower inner wall of the drum 3 to the inner peripheral ends of the blades 10 and 11 or in the vicinity of the inner peripheral end. The concrete is fed from the rear (left) to the front (right) of the drum 3 by the rotating blades 10 and 11. On the other hand, the ready-mixed concrete inside the blades 10 and 11 is fed from the front to the rear by the rotating backflow paddle 12. Thereby, the ready-mixed concrete circulates without staying in the drum, and is always stirred and kneaded. Therefore, solidification of the ready-mixed concrete in the drum 3 can be prevented.

  The five support members 13 stir the ready-mixed concrete by drawing a circular locus perpendicular to the central axis A by the rotation of the drum 3. Therefore, the stirring effect is increased and solidification of the ready-mixed concrete can be reliably prevented. Further, since the support member 13 extends in the radial direction, the central portion of the drum 3 (near the center axis A) is sufficiently stirred. Thereby, the stirring effect is further enhanced.

  Next, when the drum 3 is driven in reverse, the ready-mixed concrete in the range from the lower inner wall of the drum 3 to the inner peripheral edge of the blade is rearward from the front (right side) of the drum 3 by the rotating blades 10 and 11. To the left. Thereby, ready-mixed concrete is discharged | emitted from the discharge port 3a outside. On the other hand, the ready-mixed concrete existing inward from the blades 10 and 11 is fed from the rear to the front by the rotating backflow paddle 12. And the ready-mixed concrete sent up ahead is scraped up by the blades 10 and 11, and is all discharged | emitted. In addition, since the backflow paddle 12 is not provided in the vicinity of the discharge port 3a as described above, the wasteful operation of causing the ready-mixed concrete sent to the vicinity of the discharge port 3a to return to the front is caused. Absent.

  According to the above stirring device, the rear end portion of the center shaft 14 is supported by the two rear support members 13 that are alternately fixed in two directions orthogonal to each other from the blades 10 and 11 side, that is, the drum side. Yes. That is, the center shaft 14 for supporting the backflow paddle 12 is supported by the support member 13 from the drum side. Therefore, the center shaft 14 reaching the rear part of the drum 3 can be firmly supported, and the ready concrete in the drum including the vicinity of the rear center part of the drum 3 is agitated by the support member 13 and the backflow paddle 12 attached thereto. be able to. Thereby, it is possible to provide a stirring device that reliably prevents the vicinity of the rear center portion of the drum 3 from solidifying.

  Further, by fixing the backflow paddle 12 to the support member 13, the support member 13 can be used not only as a support for the center shaft 14 but also as a support member for the backflow paddle 12, thereby contributing to a reduction in manufacturing cost. To do. However, the rear two supporting members 13 are not fixed to the blades 10 and 11 (that is, separated from the blades 10 and 11), and the vicinity of the rear end portion of the center shaft 14 is separated from the inner walls of the blades 10 and 11 or the drum 3. It is also possible to separately provide a support member for supporting in the radial direction.

In the above embodiment, the two rear support members 13 are fixed to the blades 10 and 11, but may be directly fixed to the inner wall of the drum 3. Further, some or all of the three front support members 13 may be fixed to the blades 10 and 11 and the drum 3.
Further, in the above embodiment, as shown in FIG. 6, the backflow paddle 12 and the support member 13 are arranged at intervals of 90 degrees in the circumferential direction or are arranged to be alternately shifted by 90 degrees, but this interval is limited to 90 degrees. For example, an interval of 120 degrees (3 equidistant), an interval of 72 degrees (5 equidistant), and an interval of 60 degrees (6 equidistant) are possible. Further, the crossing angle of the support member 13 with respect to the center shaft 14 as viewed from the side is not necessarily 90 degrees, and a slightly inclined mounting is possible.

It is a side view (port side) of a mixer truck including a stirring device according to an embodiment of the present invention. It is the figure which looked at the mixer truck of Drawing 1 from back. It is sectional drawing which shows schematic structure of the drum seen from the port side. FIG. 4 is a cross-sectional view in which one of the blades and the backflow paddle provided along the blade is omitted from FIG. 3, and the blade and the backflow paddle on the near side of the cross section are indicated by a two-dot chain line. FIG. 4 is a cross-sectional view in which the other blade and the backflow paddle provided along the other blade are omitted from FIG. 3, and the blade and the backflow paddle on the near side of the cross section are indicated by a two-dot chain line. FIG. 4 is a schematic view of the internal structure of the drum shown in FIG. 3 as viewed from the axial end side of its central axis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mixer car 2 Car body 3 Drum 3b Inner wall 10,11 Blade 12 (12a-12j) Backflow paddle (stirring member)
13 Support member 14 Stirring member

Claims (3)

A drum mounted on the vehicle body and supported rotatably around the central axis;
A blade provided in a spiral shape around a central axis on the inner wall of the drum;
A center shaft provided on a central axis from the front end to the rear of the drum;
A support member connected to the center shaft and extending in a direction intersecting with the center shaft, and both ends of the support member fixed to the inner wall side of the drum;
An agitating device for a mixer vehicle, comprising: an agitating member supported by the center shaft and provided inward from an inner peripheral end of the blade.   2. The mixer vehicle according to claim 1, wherein a plurality of the agitating members are arranged along a spiral shape of the blade, and are reverse flow paddles that are inclined reversely to the blade with respect to a central axis of the drum when viewed from the side. Stirring device.   The mixer apparatus according to claim 1 or 2, wherein the stirring member is fixed to the support member.

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