JPH1058428A - Drum for concrete mixer vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve welding workability and to adjust dimensional error by providing a reinforcing member standing by bonding its one end at the center of a conical recessed part of a head plate, a flange hooked with this and an outer gusset being bonded with the flange on its one end and with a head plate on its another end. SOLUTION: A conical recessed part 11 is formed integrally at the center of a head plate 2 of a mixer drum 1 and a pipe 12 being a reinforcing member is stood at the center of this recessed part 11 and is welded and bonded therewith. A flange 13 is hooked on this pipe 12 and an outer gusset 14 is welded and bonded with the flange 13 on its one end and the head plate 2 on its another end. When the mixer drum 1 is fitted and error is generated in the dimension A and the distance L is necessarily changed, the distance L is corrected by modifying the length of the pipe to 12 adjust the dimension A. In addition, by welding and bonding one end of the outer gusset 14 with the flange 13 and another end with the head plate 2, the mixer drum is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a head plate portion of a mixer drum rotatably mounted on a concrete mixer wheel.

[0002]

2. Description of the Related Art Conventionally, a mixer drum in a concrete mixer car has a head plate, a front shell, a center shell, a rear shell, a roller ring, an end ring, and the like. The structure of the head plate portion of the mixer drum is as follows. For example, the structure is as shown in FIG. 3. To explain this, the head plate portion 15 of the mixer drum has a head plate 1 formed in an arc shape.
The outer peripheral edge 17a of the inner head 17 having a conical shape is joined to the center of the inner side of 6, and a reinforcing plate 20 is further joined to the inner head 17. A rib 18a of a flange 18 is joined to the outside center of the head plate 16, and one end is connected to the flange 18 and the other end is joined to the head plate 16 with an outer gusset 19.

[0003]

By the way, in the structure of the head plate portion of the above-mentioned mixer drum, an inner head is joined to the center of the inside of the head plate, and a flange and an outer gazette are joined to the center of the outside of the head plate. Since both the inside and the outside of the joint are welded, the workability of welding is poor, the number of man-hours for welding increases, and cost reduction cannot be achieved.

Further, a head plate, a front shell,
Due to machining errors in parts such as the center shell and rear shell and welding distortion in the front-rear direction of the drum that occurs when these parts are welded and joined, errors tend to occur in the dimensions from the flange end face of the mixer drum to the rolling ring. Although this error is adjusted by the flange rib, there is a problem that the flange rib cannot secure a sufficient adjustment dimension for adjusting the error.

In view of the above, according to the present invention, the head plate and the inner head are integrally formed, so that welding on the inside of the head plate is abolished, and the work is performed from one side, thereby improving workability. Provided is a concrete mixer car drum configured to sufficiently secure an adjustment dimension capable of adjusting a processing error of parts and a dimension error due to welding distortion in a longitudinal direction of the drum generated when welding these parts. It is to be.

[0006]

According to a first aspect of the present invention, a head plate formed into an arc shape and a front shell formed into a conical cylindrical shape having a small-diameter and a large-diameter peripheral portion engaged with the head plate. And a cylindrical shell formed into a cylindrical shape engaged with the front shell, and a rear shell formed into a conical cylindrical shape having a large-diameter and a small-diameter peripheral edge engaged with the center shell. A conical recess formed in the head plate, a reinforcing member having one end joined to the center of the recess and standing upright, a flange engaging with the reinforcing member, one end being connected to the flange, and the other end being connected to the flange. And an outer gazette to be joined to the head plate.

In the second invention, the reinforcing member is a cylindrical or pipe-shaped member.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The drum 1 of the concrete mixer truck according to this embodiment is, as shown in FIG.
The head plate 2, front shell 3, center shell 4, rear shell 5, end ring 6, etc. are welded together,
Further, a roller ring 7 is provided outside the rear shell 5.

As shown in FIG. 2, the structure of the head plate portion 10 of the mixer drum 1 is such that a conical recess 11 is integrally formed at the center of the head plate 2, and this recess 11 is formed.
A pipe 12, which is a cylindrical or pipe-shaped reinforcing member erected from the center of the pipe, is welded and joined.

A flange 13 is engaged with the pipe 12 and an outer gusset 14 is welded to one end of the flange 13 and the other end of the head plate 2 is welded thereto.

In order to attach the mixer drum 1 to the front and rear frames (not shown), the size between the end face 13a of the flange 13 provided on the head plate 2 and the roller ring 7 provided outside the rear shell 5 is required. A must be within a certain tolerance.

However, the processing accuracy of parts such as the head plate 2, the front shell 3, the center shell 4, and the rear shell 5 is poor, and welding distortion in the longitudinal direction of the drum caused when these parts are sequentially welded. If the size A causes an error and the actual finish exceeds the allowable range of the size A, the mixer drum 1 cannot be attached to the front and rear frames (not shown). It is necessary to change the distance L from the peripheral edge 2a of the head plate 2 to the end face 13a of the flange 13.

For this reason, the distance L is corrected by correcting the length E of the pipe to be welded to the head plate, whereby the roller ring provided on the end face 13a of the flange 13 and the outside of the rear shell 5 is provided. 7 is adjusted to fall within the allowable range.

When the dimension A falls within the allowable range, the mixer drum 1 is formed by welding and joining one end of the outer gusset 14 to the flange 18 and the other end to the head plate 2.

As described above, since the conical concave portion 11 corresponding to the inner head 17 in the conventional example is formed in the center of the head plate 2, there is no welding inside the head plate 2 and there is no welding. , The workability is greatly improved, the total length of welding can be reduced by about 25% as compared with the conventional welding work of the head plate portion 15 of the mixer drum, and the number of parts is reduced. Can be reduced and costs can be reduced.

Further, due to processing errors in parts such as the head plate 2, the front shell 3, the center shell 4, the rear shell 5, and the roller ring 5, and welding distortion in the longitudinal direction of the drum caused when these parts are welded. Even if an error occurs in the dimension A, the length E of the pipe 12, which is a reinforcing member, is corrected, and the outer gusset 14 is welded to the pipe 12 and the head plate 2 in accordance with the length E of the pipe 12. The dimension A between the end face 13a of the flange 13 and the roller ring 7 can be sufficiently adjusted so as to fall within the allowable error range.

Furthermore, since the reinforcing member is a cylindrical or pipe-shaped member, the weight is reduced, the processing is simple, and the cost can be reduced.

[0018]

According to the first aspect of the present invention, in a drum of a concrete mixer car, a head plate portion is formed into a conical recess formed in the head plate, and one end is welded and joined to the center of the recess. Since it is composed of a reinforcing member to be provided, a flange that engages with the reinforcing member, and an outer gazette that has one end welded to the flange and the other end welded to the head plate, there is no welding inside the head plate. ,
Welding work is performed from one side on the outside, workability is greatly improved, and the total length of welding can be reduced by about 25% as compared with the conventional welding work of the head plate portion of the mixer drum, and the number of parts is reduced. Can be reduced and costs can be reduced. In addition, head plate, front shell, center shell,
Even if there is an error in the dimension in the longitudinal direction of the drum due to processing errors of parts such as the rear shell and roller ring and welding distortion generated when welding these parts, the length of the pipe as the reinforcing member is corrected and the outer A drum for a concrete mixer vehicle that can sufficiently adjust a dimensional error between a flange end face and a roller ring by welding and joining a gusset to a pipe and a head plate according to the length of a reinforcing pipe. Can be provided.

According to the second aspect of the present invention, since the reinforcing member is a cylindrical or pipe-shaped member, it is lightweight, easy to process, and inexpensive.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a drum of a concrete mixer car showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing an embodiment of the head plate in FIG. 1;

FIG. 3 is an enlarged sectional view of a head plate portion showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixer drum 2 Head plate 2a Peripheral edge 3 Front shell 4 Center shell 5 Rear shell 6 End ring 7 Roller ring 10 Head plate part 11 Concave part 12 Pipe 13 Flange 13a Flange end face 14 Outer gadget 15 Head plate part 16 Head plate G 17 Inner head 17a Outer peripheral edge 18 Flange 18a Flange end face 19 Outer gazette A Distance between end face of flange and roller ring E Distance between end face of flange and peripheral edge of head plate L Length of pipe

Claims (2)

[Claims] 1. A head plate formed in an arc shape, a front shell formed in a conical cylindrical shape having a small-diameter and a large-diameter peripheral portion engaged with the head plate, and a cylindrical shape engaged in the front shell. And a rear shell formed in a conical cylindrical shape having a large-diameter and a small-diameter peripheral edge engaged with the center shell. A concave part, a reinforcing member which is erected at the center of the concave part at one end thereof, a flange which is engaged with the reinforcing member, and an outer gazette which is connected at one end to the flange and at the other end to the head plate. A drum for a concrete mixer car, characterized in that it is constituted. 2. The drum of a concrete mixer car according to claim 1, wherein said reinforcing member is a cylindrical or pipe-shaped member.