JPH06227310A - Hopper cover for concrete mixer truck - Google Patents

Abstract

PURPOSE:To lower the extent of required overhead height at the time of opening or closing a cover as well as to make it operable with small on-off operating force by connecting both driven and driving side covers with a hinge, installing such a linkage as driving a guide link of the driven side cover and the driving side cover both, and making it stowable after being folded at a time when these covers are opened. CONSTITUTION:A cover K is divided into two parts, a driven side cover 1 and a driving side cover 11, which are connected with a hinge 5, making them foldable. In addition, a stopper S stopping any rotation of the sriving side cover 11 at the time of stowing the halved cover K, is installed in a hopper supporting table T2. In succession, a guide link 4 attaches its lower side to a mounting piece 41 through a pin 42 in order to regulate any rotation of the driven side cover 1, and the upper end is rotatably attached to a tip end 14 of the driven side cover 1. Then, the driving side cover 11 is driven by linkage composed of a lever 2 and a link 3, while one end of this lever 2 is pivotally attached to a tip of a piston rod 81, and the other end is pivoted as free of rotation together with one end of the link 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopper cover for a mixer vehicle, which is used as a cover for covering the entire opening of a hopper for charging ready-mixed concrete arranged behind a mixer vehicle.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, an opening portion of a hopper c for feeding raw concrete placed behind a mixer car e is formed to have a size of about 1 m × 1 m in the case of a large mixer car.
In order to prevent rainwater and the like from entering the drum, a cover a having a size that covers the opening is attached to the opening.

The cover a is, as shown in FIG.
The geared motor b rotates the rotation angle R about the rotation axis d by about 180 degrees to open and close.

[0004]

However, according to the above-mentioned conventional technique, A. The opening of the hopper of a large mixer car is about 1
It is mx 1 m in size, and the cover that covers this opening is made of a single piece. Therefore, in order to open and close the cover of this single piece, it cannot be opened without a high overhead height. There is a problem.

B. Since the cover is formed of a single piece, there is a problem in that the arm length of the moment at the time of opening / closing becomes long and the opening / closing force becomes large.

Therefore, the present invention has been devised in view of the above-mentioned problems of the prior art. It is possible to lower the required overhead height when opening and closing the cover, and to operate with a small opening and closing force. The purpose of the present invention is to provide a hopper cover for a mixer vehicle that keeps the ground clearance of the mixer vehicle when opening and closing and when closing.

[0007]

In order to achieve the above object, the mixer vehicle hopper cover according to the present invention comprises a driven side cover and a drive side cover rotatable about a cover fulcrum at substantially the center. A cover that covers the entire opening of the hopper formed by splitting and connecting both covers by a hinge so that they can be folded, and that can be stopped by a stopper provided at the rear of the hopper, and a guide that can regulate the rotation of the driven side cover. Consists of a link, a lever that is not rotatable about the lever fulcrum due to expansion and contraction of the piston rod, and a link that has one end rotatably attached to the tip of the lever and the other end rotatably attached to the drive side cover. It is composed of a link mechanism that drives the drive side cover, and when the cover is open, it can be folded and stored, and when closed, it covers the entire opening. It is a symptom.

[0008]

As shown in FIG. 2, the tip of the driven side cover rotates the rotation angle A by the guide link, the hinge rotates the rotation angle B, the upper end of the link rotates the rotation angle D, and the upper end of the lever rotates. The rotation angle E rotates, and the lower end of the lever rotates the rotation angle F.

When the cover is opened, the drive side cover is rotated to the stopper position by the operation of the link mechanism consisting of the lever and the link as the piston rod extends.

At the same time, the driven-side cover follows the driving-side cover and is rotationally regulated by the guide link, comes into contact with the stopper and stops, and is stored in the folded state on the stopper side.

On the contrary, when the cover is closed, the drive side cover is rotated by the operation of the lever and the link as the cylinder rod is compressed into the cylinder, and at the same time, the driven side cover is driven by the drive side cover. The entire opening is covered while being guided by the guide link.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 shows a plan view of a hopper portion, FIG. 2 shows a cover operating state, and FIG. 3 shows a cover operating process.

The cover K is formed in such a size that it covers the entire opening 91 of the hopper 9, and the cover K is attached so as to be inclined in order to improve drainage.

On the side wall of the hopper 9, there is arranged a guard 10 for preventing fresh concrete splashes.

The cover K is divided into a driven-side cover 1 and a driving-side cover 11 at approximately the center, and the driven-side cover 1 and the driving-side cover 11 are provided with mounting pieces 12 and 13.
The attachment pieces 12 and 13 are connected by a hinge 5, and the drive side cover 1 and the driven side cover 11 are foldable.

The drive side cover 11 has a cover fulcrum 6
Rotatably attached to the hopper support base T2,
The hinge 5 is rotatable about a cover fulcrum 6 by a rotation angle B.

A stopper S for stopping the rotation of the drive side cover 11 when the cover 1K is stored is provided on the hopper support base T2 behind the hopper 9.

Hopper support T2 for supporting the hopper 9
A horizontal frame T1 is arranged on the horizontal frame T1, and a mounting piece 41 is mounted on the horizontal frame T1.
And the cylinder 8 is rotatably attached to the horizontal frame T1 by a pin 84.

The guide link 4 is arranged on the side surface side of the hopper 8, and the guide link 4 restricts the rotation of the driven side cover 1, so that the lower end of the guide link 4 is the mounting piece 4 described above.
1 is attached to the shaft 1 by a pin 42, and the upper end is the driven side cover 1
Is rotatably attached to the tip portion 14 of the.

The tip end of the driven side cover 1 is rotatable by the guide link 4 with the pin 42 as the fulcrum (see FIG. 2).

The drive side cover 11 is composed of a lever 2 and a link 2 which are formed in a V shape, and can be driven by a link mechanism L capable of reducing the stroke of the cylinder 8.

The lever 2 has one end rotatably attached to the tip of the piston rod 81 by a pin 85, and
The other end is rotatably attached to one end of the link 3 by a pin 32, and the lever 2 is attached to the hopper support base T2 rotatably about the lever fulcrum 7 by expansion and contraction of the piston rod 81. The end (lower end) is rotatable by a rotation angle F, and the other end (upper end) is rotatable by a rotation angle E.

The other end of the link 3 is rotatably attached to the side surface of the drive side cover 11 by a pin 31 so that the rotation angle D can be rotated.

Next, FIG. 4 shows another embodiment of the driving means of the driving side cover 1, in which a rod 82 is rotatably attached to one end of the lever 2 instead of the cylinder 8, and The lower end of the rod 82 is pivotally attached to a predetermined position of a lever 83 rotatably attached to the hopper support base T2, and the lever 2 and the link 3 are driven by the vertical movement of the lever 83, and the cover K is rotated. Can be opened and closed manually.

Instead of the link mechanism L composed of the cylinder 8, the lever 2 and the link 3, a rotary actuator (not shown) may be used to directly rotate the cover K.

[0026]

Since the present invention is configured as described above, it has the following effects.

A. When the opening of the hopper is opened, the cover is stored in a folded state, so that the cover can be opened and closed at a lower overhead height than in the case of the conventional one-piece cover.

B. Since the cover is opened and closed by the link mechanism and the guide link, the moment around the center of rotation can be reduced and the opening and closing force can be reduced as compared with the conventional one-piece cover.

C. The stroke of the piston rod of the cylinder can be reduced by the link mechanism consisting of the combination of the lever and the link for increasing the rotation angle.

As a result, the mounting length of the cylinder can be shortened.

D. The combined cover of the link mechanism and the guide link can be securely folded and stored on the stopper side, so that the cover can be securely stored and fixed.

[Brief description of drawings]

FIG. 1 is a plan view of a hopper portion of a mixer car.

FIG. 2 is an operation explanatory diagram of an opened / closed state of a cover.

FIG. 3 is an operation explanatory view of a cover opening process (folding process).

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a hopper of a conventional mixer car.

FIG. 6 is a perspective view of a main part around a conventional cover.

[Explanation of symbols]

 K cover 1 driven side cover 11 drive side cover 2 lever 3 link 4 guide link 5 hinge 6 cover fulcrum 7 lever fulcrum 8 cylinder 81 piston rod 9 hopper 10 guard S stopper

Claims (1)

[Claims] 1. A stopper provided at the rear of a hopper, which is divided into a driven side cover and a driving side cover which is rotatable about a cover fulcrum at approximately the center, and which are foldably connected by a hinge. A cover that covers the entire opening of the hopper that can be stopped, a guide link that can regulate the rotation of the driven side cover, and a lever that has a zigzag shape and one end that is not rotatable about the lever fulcrum due to expansion and contraction of the piston rod. The lever is rotatably attached to the tip and the other end is rotatably attached to the drive side cover. The link mechanism drives the drive side cover. The cover can be folded and stored when opened. The hopper cover for mixer cars is characterized in that it covers the entire opening when closed.