JPS5933608Y2 - Concrete mixer drum - Google Patents

Description

[Detailed explanation of the invention] When the rotating drum of a concrete mixer truck is loaded with fresh concrete and the vehicle climbs a steep slope or is suddenly accelerated, the rear of the vehicle lowers, which causes the rear discharge port of the drum to close. The level of the ready-mixed concrete becomes higher, and as a result, the ready-mixed concrete stored in the drum flows out from the rear discharge port.

Therefore, in order to prevent this, conventionally, a seal cylinder whose outer periphery is welded to the drum blade is concentrically inserted inside the discharge port to solve the above problem.

However, with a drum equipped with a seal cylinder like this,
When fresh concrete is loaded from the hopper into the drum via the sealed cylinder and discharged from the drum, it is sent from outside the sealed cylinder to the discharge port according to the rotation of the drum and discharged to the outside. In the case where a seal cylinder is provided in this way, the ready-mixed concrete stagnates and adheres to the corner of the discharge path formed by the seal cylinder, drum blade, and drum shell during discharge, and this discharge path is not connected to the drum. It is easy to solidify because it is close to the opening, and even when cleaning the inside of the drum, it is impossible to remove the concrete that remains in the corners of the discharge channel, and the discharge channel is narrow, making it difficult for people to get in. Therefore, it is impossible to peel off the set concrete with a chisel, and the passage of fresh concrete during discharge is narrowed, resulting in problems such as a significant decrease in discharge performance.

In order to solve these conventional problems, the present invention has a plurality of holes drilled in the peripheral wall of the seal cylinder, and a peeling pick is inserted through the holes to prevent residual adhesion in the discharge passage. To provide a drum for a concrete mixer vehicle that allows ready concrete to be easily removed.

An example of the implementation of the present invention will be described below based on the attached drawings. Reference numeral 10 denotes a seal cylinder inserted concentrically inside the discharge port 2 of the drum 1. In this embodiment, the seal cylinder 10 is a seal pipe 4. The outer periphery is welded to the drum blade 3, and a large number of holes 6 having appropriate diameters are bored in the peripheral wall.

The diameter of these holes 6 is such that when fresh concrete is discharged,
When the outside of the cylinder wall is sent toward the discharge port 2 by the rotation of the drum or blade 3, the size is such that the bath does not come out from the hole 6, and a peeling pick such as a chisel can be easily inserted. In other words, the pore diameter is selected to be 2 to 6 cm.

Moreover, since the area of the seal cylinder 10 varies depending on the size of the vehicle, for example, about 5 to 15 holes 6 are bored in the seal cylinder 10 in correspondence to this area.

Since a plurality of holes 6 are bored in the peripheral wall of the seal cylinder 10 consisting of the seal pipe 4 and its extension portion 5 as described above,
A peeling pick is driven with a hammer or the like from inside the seal cylinder 10 through these holes 6 toward the discharge passage 7, which is surrounded by the seal cylinder 10, the drum shell 1, and the blade 3, and which discharges the ready-mixed concrete in the drum. The concrete C that has condensed on the peripheral wall of the cylinder 10, the corners of the seal cylinder 10 and the blade 3, etc. can be extruded or crushed to be removed.

In addition, the shock caused by the peeling causes cracks in the concrete that has adhered to other parts, making it easy for the drum to separate. In addition, when cleaning the drum, cleaning water flows into the discharge passage 7 through the holes 6, so the discharge passage 7 This has an excellent practical effect in that it is possible to clean the partitions of the concrete and prevent deterioration in discharge performance due to narrowing of the passage of fresh concrete during discharge.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view of an embodiment of the drum of the present invention, and FIG. 2 is an enlarged sectional view taken along line A--A in FIG. 1...Drum, 4...Seal pipe,
5...extension part, 6...hole, 10...
... Seal cylinder.

Claims (1)

[Scope of utility model registration request] A drum for a concrete mixer vehicle, in which a plurality of holes 6 for inserting peeling picks are bored in the peripheral wall of a seal cylinder 10 provided inside the discharge port of the drum 1.