JP2592984Y2 - Structure of cement chute - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement chute of a stirrer such as a mixer for kneading and producing cement milk or mortar.

[0002]

2. Description of the Related Art A stirrer such as a mixer for kneading and producing cement milk or mortar is provided with a cement chute as an inlet for cement or the like.
It is injected through the cement chute. For example, FIG. 3 is a cross-sectional view showing a conventional example.
Reference numeral 2 denotes a mixer body, and cement or the like put into the mixer body 22 via the chute 21 is kneaded by a stirring blade 23 driven by a motor 24. Also,
A cement silo (not shown) is connected to the chute 21 via a passage 25, and the cement is automatically supplied by opening and closing a valve 26.

[0003]

However, in order to shorten the kneading time, the stirrer often carries out the charging of the material into the mixer 22 and the stirring at the same time. Therefore, the stirring solution jumps violently in the mixer 22. Due to the splashing state, the inner surface 21a of the chute 21 closest to the upper surface of the solution in the mixer 22 is liable to splash and is always in a wet state. However, since the adhered cement does not fall off, the passage of the chute 21 is gradually narrowed, and the passage is finally closed.

Conventionally, as shown in FIG. 3, a cleaning window 27 is provided on the chute 21 so as to be freely opened and closed, and the inside of the chute 21 is viewed through the cleaning window 27. When the passage becomes narrow, the cleaning window 27 is cleaned. However, this is troublesome and troublesome, since it requires monitoring and repeated cleaning. Further, as a method of solving the above-mentioned inconvenience, there is a method of providing a gate valve on the chute 21 in the related art.
There are problems such as frequent cleaning and an increase in the size of the device. Further, conventionally, a polymer paint is applied to the inner surface 21a of the chute 21 or a rubber sheet is stuck to facilitate cleaning, or the chute 21 itself is made of a flexible material and is hit from the outside. However, with manual work, this has been an obstacle to the automation of the apparatus, and has been one of the problems that affect the performance of the apparatus.
An object of the present invention is to provide a structure of a cement chute capable of automatically separating and falling off the cement adhering to the chute in view of the above points.

[0005]

In order to achieve the above object, the present invention provides a chute for charging cement or the like into a stirring device such as a mixer, which has the following requirements. (1) The chute shall be formed as a double cylinder of an inner cylinder and an outer cylinder. (2) The inner cylinder is formed of a flexible material. (3) The space between the inner cylinder and the outer cylinder is configured as a closed chamber. (4) A pressurizing and depressurizing device is connected to the closed chamber.

[0006]

[Function] The chute is formed in a double cylinder of an inner cylinder and an outer cylinder,
Since the inner cylinder is formed of a flexible material, the inner cylinder can expand and contract. A closed chamber is provided between the inner cylinder and the outer pipe, and a pressurizing and depressurizing device is connected to the closed chamber. Therefore, the pressurizing and depressurizing device can pressurize or depressurize the closed chamber. it can. At this time, since the inner cylinder is formed of a flexible material and can expand and contract, the inner diameter of the inner cylinder expands and contracts, and the cement attached to the inner surface falls off. Therefore, by automatically opening and closing the pressurizing and depressurizing devices, the cement adhering to the inner surface of the chute is
It can be peeled off automatically.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a sectional view showing an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a mixer, in which a stirring blade 2 fixed to a rotating shaft 3 is provided, and is configured to be rotated by a motor 4 via a transmission mechanism 5. Reference numeral 6 denotes a cement chute as a cement inlet. A cement silo (not shown) is connected to the chute 6 via a passage 9, and cement from the cement silo is supplied to the mixer 1 via the chute 6. The passage 1
The valve 0 is provided with a valve 11 and the cement is automatically supplied at the time of opening and closing.

The chute 6 is formed by an inner cylinder 7 and an outer cylinder 8, and a space between the inner cylinder 7 and the outer cylinder 8 is formed in a closed chamber 9.
The inner cylinder 7 is formed of a flexible material such as rubber.

[0009] A compressor 13 as a pressurizing device and a vacuum pump 14 as a depressurizing device are connected to the closed chamber 9 via a pipe 12. A valve 15 is provided at an appropriate position of the pipe 12, and can be switched to a compressor 13 and a vacuum pump 14. In the figure, 16
Is a pressure reducing tank of the vacuum pump 14.

According to the embodiment configured as described above, the closed chamber 9 of the chute 6 is pressurized by the compressor 13,
Further, the pressure can be reduced by the vacuum pump 14. That is, since the compressor 13 and the vacuum pump 14 are connected to the closed chamber 9, the closed chamber 9 is pressurized when communicating with the compressor 13 with the valve 15, and the closed chamber 9 is connected with the vacuum pump 14 with the valve 15. The pressure is reduced. FIG.
Indicates a pressurized state, and FIG. 2 illustrates a depressurized state.

Then, the inner cylinder 7 constituting the chute 6
Since it is formed of a flexible material such as rubber, when the closed chamber 9 is pressurized, the inner cylinder 7 is pressed and deformed so as to reduce the diameter of the passage of the chute 6 (FIG. 1). Inner cylinder 7
Is closely adhered to the inner surface of the outer cylinder 8 so as to enlarge the passage of the chute 6 (FIG. 2). By pressurizing or depressurizing the closed chamber 9 in this manner, the inner diameter of the inner cylinder 7, that is, the inner diameter of the chute 6, expands and contracts.

However, the cement or the like stuck (adhered) to the inner surface of the chute 6 can be separated and dropped by increasing the inner diameter of the chute 6. Since the expansion and contraction of the chute 6 can be performed by switching the valve 15, the expansion and contraction of the inner diameter of the chute can be automatically performed by controlling the valve 15. Therefore, at an appropriate time, for example, every time the input of the material such as cement is completed, the valve 15 is automatically controlled to enlarge the inner diameter of the chute 6,
The cement or the like adhering to the inner surface of the chute 6 is peeled off to prevent the chute 6 from blocking the cement passage. One time of the scaling operation is sufficient, but it may be repeated several times. Note that the inner cylinder 7 is in a normal state when a material such as cement is charged and during kneading (FIG. 1).
(State), the valve 15 is positioned.

In the above embodiment, the inner cylinder 7 of the chute 6 is expanded and contracted so as to peel off and remove cement deposits. However, in the present invention, the inner cylinder 7 may be expanded and contracted in the axial direction. Further, the present invention is not limited to cement and mortar, and can be applied to bentonite and other material input chutes.

[0014]

As described above, in the present invention, the inner cylinder and the outer cylinder are double cylinders, the space between the inner cylinder and the outer cylinder is a sealed chamber, the inner cylinder is formed of a flexible material, Since the pressurizing and depressurizing devices are connected to the chamber, the inner diameter of the inner cylinder, which is a chute, can be expanded or contracted by pressurizing or depressurizing the closed chamber. Therefore, the chute can be prevented from being blocked by expanding and contracting the chute at an appropriate time and peeling and falling off the cement or the like adhering to the inner surface of the chute. In addition, since the chute can be expanded and contracted by switching lines from the pressurizing and depressurizing devices, automatic control can be performed, and the cleaning work of the cement chute, which was conventionally done manually by specialists covered with cement, is completely unmanned. Can be done.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a pressure-reduced embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixer 2 Stirrer blade 6 Cement chute 7 Inner cylinder 8 Outer cylinder 9 Sealed room 13 Compressor 14 Vacuum pump 15 Valve

Claims (1)

(57) [Scope of request for utility model registration] 1. A cement chute structure for supplying cement to a stirrer such as a mixer by utilizing gravity, wherein the cement chute has a double cylinder structure including an outer cylinder and an inner cylinder formed of a flexible material. A structure of a cement chute, wherein a sealed chamber connected to the device via a direction switching valve is formed by the outer cylinder and the inner cylinder.