JP2014188736A - Concrete mixer truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete mixer truck that increases a maximum authorized payload of ready-mixed concrete and that can prevent deformation of a mixer drum during a chipping operation.SOLUTION: A concrete mixer truck 1 includes a mixer drum 10 that is rotatably loaded on a vehicle body 2. The thickness t,tand tof the mixer drum 10 is set to be in the range of 2.0-3.5 mm. Thus, deformation of the mixer drum 10 during a chipping operation can be prevented while a maximum authorized payload of ready-mixed concrete in the mixer drum 10 is increased.

Description

  The present invention relates to a mixer vehicle including a mixer drum that is rotatably mounted on a vehicle body.

  The mixer truck is a vehicle that loads ready-mixed concrete on a mixer drum that is rotatably mounted on a vehicle body and transports the ready-mixed concrete.

  Patent Document 1 discloses a mixer vehicle including a mixer drum that includes a head plate, a front shell, a center shell, and a rear shell.

JP-A-10-44130

  In such a mixer vehicle, by reducing the drum weight by reducing the plate thickness of the mixer drum, the maximum loading amount of the ready-mixed concrete of the mixer drum can be increased by the weight reduction.

  However, if the plate thickness of the mixer drum is made too thin, the mixer drum tends to be recessed during the chipping operation for removing the ready-mixed concrete fixed to the inner peripheral surface of the mixer drum. Therefore, the chipping work must be carefully performed so that the mixer drum is not dented and deformed, and workability during the chipping work is deteriorated.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a mixer truck capable of increasing the maximum loading capacity of ready-mixed concrete and preventing deformation of the mixer drum during chipping. To do.

  The mixer vehicle of the present invention includes a mixer drum that is rotatably mounted on a vehicle body, and the thickness of the mixer drum is set to 2.0 mm or more and 3.5 mm or less.

  According to the present invention, since the thickness of the mixer drum of the mixer truck is set to 2.0 mm or more and 3.5 mm or less, the drum weight can be reduced and the weight can be reduced even when the mixer drum having the same outer shape as the conventional one is used. Therefore, the maximum load capacity of the mixer drum can be increased by that amount. Furthermore, since the thickness of the mixer drum 10 is set to a thickness that can withstand the chipping operation, deformation of the mixer drum during the chipping operation can be prevented.

1 is a side view of a mixer truck according to an embodiment of the present invention. It is a partial cross section figure of the mixer drum with which a mixer car is provided.

  Hereinafter, with reference to FIG.1 and FIG.2, the mixer vehicle by embodiment of this invention is demonstrated.

  A mixer truck 1 shown in FIG. 1 is a vehicle that transports ready-mixed concrete put into a mixer drum 10 in a concrete plant.

  As shown in FIG. 1, the mixer truck 1 is discharged from a mixer drum 10 on which ready-mixed concrete is loaded, a drive device 20 that rotationally drives the mixer drum 10, a hopper 30 that supplies ready-mixed concrete to the mixer drum 10, and the mixer drum 10. And a chute 40 for guiding the ready-mixed concrete to a predetermined position.

  The mixer drum 10 is a cylindrical member whose rear end is formed as an open end, and is rotatably mounted on the gantry 2A of the vehicle body 2.

  A drive shaft 10 </ b> A is provided at the front end of the mixer drum 10, and a roller ring 10 </ b> B is provided at the outer periphery of the rear portion of the mixer drum 10. The drive shaft 10A of the mixer drum 10 is connected to a hydraulic motor (not shown) of the drive device 20 disposed on the front side of the gantry 2A. The roller ring 10B of the mixer drum 10 is supported from below by a plurality of rollers 3A of the support portion 3 disposed at the rear portion of the gantry 2A. The mixer drum 10 is disposed on the gantry 2A in a forward inclined posture with the rear end side lifted upward. The mixer drum 10 is configured to rotate forward or backward by a hydraulic motor of the drive device 20.

  In the mixer drum 10, drum blades (not shown) are spirally disposed along the drum inner wall surface. The fresh concrete is agitated by the drum blade rotating together with the mixer drum 10.

  When the mixer drum 10 rotates forward, the drum blade moves the ready-mixed concrete in the mixer drum 10 forward while stirring. On the other hand, when the mixer drum 10 rotates in the reverse direction, the drum blade moves the ready-mixed concrete backward while stirring. Thus, the ready-mixed concrete can be discharged from the open end of the mixer drum 10 by rotating the mixer drum 10 in the reverse direction. The ready-mixed concrete discharged from the mixer drum 10 is guided to a predetermined position via a chute 40 that is pivotably provided at the lower rear portion of the mixer truck 1.

  In addition, when putting ready concrete into the mixer drum 10 through the hopper 30 provided in the rear upper part of the mixer vehicle 1, the mixer drum 10 is rotated forward at a speed higher than the stirring rotation.

  Next, the configuration of the mixer drum 10 will be described with reference to FIG. FIG. 2 is a partial cross-sectional view of the mixer drum 10 provided in the mixer vehicle 1. In FIG. 2, the description of the drum blade provided in the mixer drum 10 is omitted.

  As shown in FIG. 2, the mixer drum 10 includes an arc-shaped end plate 11, a front shell 12 connected to the rear end of the end plate 11, a center shell 13 connected to the rear end of the front shell 12, and a center shell 13. And a rear shell 14 connected to the rear end. As described above, the end plate 11, the front shell 12, the center shell 13, and the rear shell 14 are sequentially arranged from the front side of the mixer vehicle 1.

  The end plate 11 is an arc-shaped lid member that constitutes the front closed end of the mixer drum 10. A drive shaft 10A is fixed at the center of the front surface of the end plate 11, and a front shell 12 is joined to the rear end of the end plate 11 by welding.

  The front shell 12 constitutes the front portion of the mixer drum 10. The front shell 12 is a truncated cone-shaped cylindrical member formed so as to increase in diameter from the front end toward the rear end. A center shell 13 is joined to the rear end of the front shell 12 by welding.

  The center shell 13 is a cylindrical member that constitutes the central portion of the mixer drum 10. A rear shell 14 is joined to the rear end of the center shell 13 by welding.

  The rear shell 14 constitutes the rear part of the mixer drum 10. The rear shell 14 is a truncated cone-shaped cylindrical member formed so as to reduce in diameter from the front end toward the rear end. The rear end of the rear shell 14 becomes the opening end of the mixer drum 10. A roller ring 10 </ b> B is attached to the outer periphery of the rear shell 14.

  In the mixer drum 10, the front end 13A and the rear end 13B of the center shell 13 are formed to bend inward. The front end 13A of the center shell 13 is inserted into the front shell 12 so that the outer peripheral surface of the front end 13A and the inner peripheral surface of the rear end of the front shell 12 abut. The front shell 12 and the center shell 13 are joined by welding the rear end of the front shell 12 along the outer periphery of the center shell 13. In this manner, the front shell 12 and the center shell 13 before welding are arranged by placing the front shell 12 and the center shell 13 by bringing the outer peripheral surface of the front end 13A of the center shell 13 into contact with the inner peripheral surface of the rear end of the front shell 12. The alignment of the shell 13 becomes easy.

  A weld bead 15 is formed on the outer peripheral surface of the center shell 13 along the rear end of the front shell 12.

  On the other hand, the rear end 13B of the center shell 13 is inserted into the rear shell 14 so that the outer peripheral surface of the rear end 13B and the inner peripheral surface of the front end of the rear shell 14 abut. The rear shell 14 and the center shell 13 are joined by welding the front end of the rear shell 14 along the outer periphery of the center shell 13. In this way, the center shell 13 and the rear shell 14 are disposed by bringing the outer peripheral surface of the rear end 13B of the center shell 13 into contact with the inner peripheral surface of the front end of the rear shell 14, so that the rear shell 14 and the center shell 13 before welding are arranged. Positioning becomes easy.

  A weld bead 16 is formed on the outer peripheral surface of the center shell 13 along the front end of the rear shell 14.

  By the way, in the conventional mixer truck, the plate thickness of the front shell, center shell, and rear shell of the mixer drum is set to about 4.0 mm. However, in such a mixer vehicle, there is room for studying the plate thickness of the members constituting the mixer drum from the viewpoint of reducing the weight of the drum. Further, if the plate thickness is made too thin for weight reduction, the mixer drum is likely to be recessed during the chipping operation for removing the ready-mixed concrete fixed to the inner peripheral surface of the mixer drum. Therefore, the chipping work must be carefully performed so that the mixer drum is not dented and deformed, and workability during the chipping work is deteriorated.

  Therefore, in the mixer truck 1 according to the present embodiment, the plate weights of the front shell 12, the center shell 13 and the rear shell 14 of the mixer drum 10 are set to be thinner than 4.0 mm to reduce the drum weight, and the mixer drum 10 is reduced by the weight. Increase the maximum loading capacity of ready-mixed concrete.

In the mixer vehicle 1, the plate thickness t _F of the front shell 12, the plate thickness t _C of the center shell 13, and the plate thickness t _{R of the} rear shell 14 are set to 3.5 mm or less in order to reduce the weight of the mixer drum 10. The If each plate thickness t _F , t _C , t _R is smaller than the conventional plate thickness (4.0 mm) but more than 3.5 mm, the effect of reducing the weight of the drum is small, and the maximum loading of the mixer drum 10 is achieved. The effect of increasing the amount is small.

On the other hand, the plate thickness t _F of the front shell 12, the plate thickness t _C of the center shell 13, and the plate thickness t _{R of the} rear shell 14 are set to 2.0 mm or more in order to prevent deformation of the mixer drum 10 during the chipping operation. If the plate thicknesses t _F , t _C , and t _R are 2.0 mm or more, the mixer drum 10 will not be recessed even if the chipping operation is performed, but if it is thinner than 2.0 mm, the chipping operation will be performed. Due to the above, deformation such as a dent of the mixer drum 10 was confirmed.

The plate thicknesses t _F , t _C , and t _R are not only the above-mentioned factors for preventing the drum from being lightened and preventing drum deformation during the chipping operation, but also the roller ring 10B on which the supporting force from the roller 3A (see FIG. 1) acts. Various factors such as drum strength at the installation position and wear resistance against ready-mixed concrete have been considered. As a result, the plate thickness t _F of the front shell 12 of the mixer drum 10, the plate thickness t _C of the center shell 13, and the plate thickness t _{R of the} rear shell 14 are the same in a range of 2.0 mm or more and 3.5 mm or less. Set to thickness. KakuitaAtsu t _F, t _C, it is not always necessary to set the t _R each same thickness, setting the above-mentioned range, if sooner the thickness t _F, t _C, the t _R to an arbitrary thickness May be.

Thus, by setting the plate thickness t _F of the front shell 12, the plate thickness t _C of the center shell 13 and the plate thickness t _{R of the} rear shell 14, The deformation of the mixer drum 10 during work can be prevented.

The plate thickness t _F of the front shell 12, the plate thickness t _C of the center shell 13, and the plate thickness t _{R of the} rear shell 14 are set to be thinner than the plate thickness t _{0 of the} end plate 11 constituting the front closed end of the mixer drum 10. ing.

  According to the above-described mixer vehicle 1 of the present embodiment, the following effects are obtained.

The plate thicknesses t _F , t _C and t _R of the mixer drum 10 of the mixer vehicle 1 are set to 2.0 mm or more and 3.5 mm or less. Thereby, even when the mixer drum 10 having the same outer shape as the conventional one is used, the drum weight can be reduced, and the maximum load amount of the mixer drum 10 can be increased by the weight reduction. Furthermore, since the plate thicknesses t _F , t _C , and t _R of the mixer drum 10 are set to a thickness that can withstand the chipping operation, the mixer drum 10 can be prevented from being deformed during the chipping operation.

The mixer drum 10 has a front shell 12, a center shell 13, and a rear shell 14. The thicknesses t _F , t _C , and t _R of the shells 12, 13, and 14 are in the range of 2.0 mm to 3.5 mm. Are set to the same thickness. Thus, by making the plate thickness of the front shell 12, the center shell 13 and the rear shell 14 the same, it is possible to share materials and the like for manufacturing the shells 12, 13, and 14 and increase the manufacturing efficiency of the mixer drum 10. Can do.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  In the mixer truck 1 according to the present embodiment, a cylindrical mixer drum 10 is constituted by four members of a mirror plate 11, a front shell 12, a center shell 13, and a rear shell 14. However, the mixer drum 10 may be a cylindrical member composed of two members, three members, or five or more members, instead of the four members.

DESCRIPTION OF SYMBOLS 1 Mixer car 2 Car body 10 Mixer drum 11 End plate 12 Front shell 13 Center shell 14 Rear shell 20 Drive device 30 Hopper 40 Chute

Claims (2)

A mixer vehicle comprising a mixer drum rotatably mounted on a vehicle body,
The plate thickness of the mixer drum is set to 2.0 mm or more and 3.5 mm or less.
A mixer truck characterized by that. The mixer drum has a front shell, a center shell, and a rear shell in order from the vehicle front side.
Each plate thickness of the front shell, the center shell, and the rear shell is set to the same thickness.
The mixer truck according to claim 1.

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