JPH10151335A - Raw material feeder for mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent kneaded material from being stuck in a feeding part due to scattering or the like thereof and to feed powdery raw material smoothly and always surely. SOLUTION: In this feeder, a feeding part 16 almost in the shape of a cylinder is connected to a raw material feeding port 15 of a mixing drum 2 constituting a mixer 1 so that they may be freely communicative with each other, and a raw material feeder 19 is connected to the side of the feeding part 16 so that they may be freely communicative with each other, and also a piston body 17 is freely ascendably and descendably installed in the feeding part 16. And on feeding the raw material, the piston body 17 is ascended to open the raw material feeding port 15, and also on kneading, the piston body 17 is descended to scrape off adhering matter in the feeding part 16 and also close the raw material feeding port 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for feeding a raw material of a mixer which is mainly used for producing a cement paste or the like.

[0002]

2. Description of the Related Art Conventionally, as a mixer of this kind, there has been known a paste mixer (for example, see Japanese Utility Model Publication No. 63-33622). ing. Then, the mixer mixes powder such as cement with a liquid such as water into a cylindrical mixing drum, and then feeds the powder to the center by a screw that generates a thrust inward from both ends. The paste is primarily dispersed by the compression and shearing action that occurs in the part, and then the paste is pumped to the narrowing passage by the action of the blades that generate thrust in the circumferential direction to reduce the flow velocity of the paste. High, and after having collided with the colliding body with the discharge force, recirculated into the mixing drum again through the recirculation passage,
It is configured to obtain a high degree of dispersion of particles in a short time.

[0003] In the above-described conventional device for charging a powder material such as cement in a mixer, a raw material supply device is connected to a raw material charging port of a mixing drum through a cylindrical charging portion. The powder raw material supplied from the raw material supply device is directly charged into the mixing drum from a charging section through a raw material charging port. However, since the charging section is merely formed in a cylindrical shape, the charging section is always in communication with the mixing drum through the raw material charging port. Therefore, not only when the powder material is charged, the kneaded material is scattered during kneading, but also adheres to the charging section due to the high humidity of the atmosphere in the mixing drum. Further, the powdery raw material is more likely to adhere to the top and become a large obstacle. Particularly, in a mixer of a type in which the stirring member is rotated at high pressure and high speed to improve the mixing performance, the kneaded material is scattered violently, and the scattered kneaded material adheres to the charging portion and is closed in a short time. Things. As described above, the kneaded material adhered in the charging section is a material that significantly impedes the charging of the powder raw material, and, in turn, causes an inconsistency in the mixing ratio between the charged raw material and the kneaded product, or This causes problems in quality control, such as the kneaded material falling into the mixing drum and deteriorating the quality of the kneaded product, and is likely to cause a critical malfunction of the mixer.

In order to solve the problems of the conventional example, there has been proposed an apparatus in which the top wall of a mixing drum is raised and the distance between a raw material inlet and a stirring body is increased. However, it is almost impossible to reliably prevent the kneaded material from adhering to the charging section due to scattering or the like.

[0005] The present invention solves the conventional problems and reliably prevents the adhesion in the charging section due to the scattering of the kneaded material.
It is an object of the present invention to provide a raw material input device for a mixer which can smoothly and surely input a powder raw material.

[0006]

That is, the present invention provides a material charging port 15 for a mixing drum 2 constituting a mixer-1.
An input portion 16 having a substantially cylindrical shape is communicably connected to the feed portion 16. A raw material supply device 19 is communicably connected to a side portion of the input portion 16, and a piston body 17 is movable up and down in the input portion 16. The piston body 1
7, the raw material input port 15 is opened to open the raw material input port 15, and at the time of kneading, the piston body 17 is lowered to scrape off the deposits in the input section 16 and close the raw material input port 15.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS At the time of charging raw materials, a piston
Is raised to open the raw material input port 15, and the raw material supplied from the raw material supply device 19 is injected into the mixing drum 2 through the input section 16. In addition, at the time of kneading, the piston body 17 is lowered to scrape off deposits such as raw materials adhering to the charging section 16 and close the raw material charging port 15 so that the kneaded substance is dispersed into the charging section 16 due to scattering or the like. Prevents adhesion. Note that such a raw material input device for a mixer can be widely applied to mixers for cement, food products, chemical industry products, pharmaceuticals, cosmetics, and the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a paste mixer, 2 a cylindrical mixing drum constituting the mixer 1, and 3 a transfer thrust from both ends horizontally disposed in the mixing drum 2 toward the center. The screw 4 is a rotating shaft of the screw 3, and the rotating shaft 4 is connected to an output shaft of a motor 5 with a continuously variable transmission via a belt and rotates in a predetermined direction. It has been. 6 is the rotating shaft 4
The blades are mounted at the center of the blade and generate downward thrust. Reference numeral 7 denotes a reflux chamber connected below the mixing drum 2 via a horizontal partition wall 8, and 9 and 10 denote openings formed at both ends and a central portion of the horizontal partition wall 8, respectively.
The mixing drum 2 and the recirculation chamber 7 can communicate with each other through the openings 9 and 10. 11 is the central opening 1
0, a narrowing passage formed downward in the reflux chamber 7 by communicating with the lower side, 12 is a reflux passage branched from the tip of the narrowing passage 11 to each of the openings 9 at both ends, and 13 is a reflux passage formed in the reflux chamber 7. A wide-width flap attached to the bottom, the flap 13 has a function of discharging a kneaded product and having an effect as a collision body of the kneaded material. Numeral 14 denotes a hydraulic cylinder for operating the flap 13.

Reference numeral 15 denotes a raw material input port formed at the top wall of one end of the mixing drum 2, and 16 denotes a square, substantially cylindrical input section which is erected to communicate with the raw material input port 15 and has a required height. Reference numeral 17 denotes a piston body provided inside the charging section 16 so as to be able to move up and down. Reference numeral 18 denotes a hydraulic cylinder provided at the top of the charging section 16 to move the piston body 17 up and down as appropriate. Reference numeral 19 denotes a powder feeder screw feeder connected to the middle of the side of the input unit 16 in a communicating manner, and reference numeral 20 denotes a distal end of the screw feeder 19 for opening and closing an outlet 21 of the screw feeder 19. A valve element pivotally attached downward, the valve element 2
Numeral 0 protrudes into the insertion section 16 and is configured to open and close the discharge port 21 of the screw feeder 19 in conjunction with the elevating operation of the piston body 17. Reference numeral 22 denotes a liquid injection pipe connected to the top of the mixing drum 2 in the vicinity of the input section 16, and reference numeral 23 denotes an injection pipe for an admixture or the like connected to one side wall of the mixing drum 2.

Next, the operation of the embodiment configured as described above will be described. First, the piston body 17 is raised by the operation of the hydraulic cylinder 18 to open the raw material inlet 15, the valve body 20 is protruded into the inlet 16, and the outlet 21 of the screw feeder 19 is opened. . After that, the feeding section 1 is fed from the screw feeder 19.
6 through which a powder material such as cement is supplied into a liquid input pipe 2.
2, a liquid such as water, and an admixture and the like are charged into the mixing drum 2 from the charging pipe 23, respectively. At this time,
Although the water-containing powder raw material scatters upward and adheres to the vicinity of the lower end edge in the charging section 16, the valve element 20 effectively prevents the powder material from adhering above the charging section 16. When the charging of the powder raw material and the like was completed, the piston body 17 was moved downward by the operation of the hydraulic cylinder 18 to scrape off the deposits in the lower edge of the charging section 16 and to close the raw material charging port 15 of the mixing drum 2. After that, the motor 5 is started, and the screw 3 and the blade 6 are operated via the rotating shaft 4. Then, the supplied powdery raw material, water, and the like are kneaded while being pressed inward each other by the rotation of the screw-3.

At the center of the screw 3, the paste fed from both ends collides and undergoes a shearing action together with a compressing action, so that the degree of dispersion of the particles in the paste increases. At this time, the paste scatters upward, but the piston body 17 reliably prevents the paste from entering the charging section 16. The paste fed to the center of the screw 3 is fed into the narrowing passage 11 by the compressive force of the screw 3 and the gravitational force of the paste itself together with the thrust downwardly transferred by the blade 6. At a very high flow velocity, the flap 13 is made to collide with the inner surface to further increase the degree of dispersion of the particles. The colliding paste is sequentially branched, passes through the return passages 12, and is returned to the mixing drum 2 through the openings 9 at both ends. Thereafter, the paste is sequentially circulated through the mixing drum 2 and the reflux chamber 7 to obtain a high degree of dispersion of paste particles. When the generation of the paste is completed, the hydraulic cylinder 14 is operated to open the flap 13 and the generated paste is discharged.

It should be noted that the apparatus for charging a raw material of a mixer according to the present invention is not limited to the application to the mixer 1 shown in the above embodiment, but may be another known mixer similar to this.
It can also be applied to

[0013]

Since the present invention is constructed as described above, the piston 17 is raised when the raw material is charged to open the raw material inlet 15 of the mixing drum 2, and the piston 17 is lowered when kneading. Input unit 1
6 as well as scraping off the deposits adhering to
Can be closed, and adhesion of the kneaded material to the charging section 16 due to scattering of the kneaded material during kneading can be reliably prevented. For this reason, the powder raw material can always be smoothly and surely charged through the charging section 16, and, as a result, the quality of the kneaded product due to the fall of the deposits is reduced as in the conventional example. There is no risk of lowering the quality, and quality control can always be easily performed. In addition, the piston body 17 can reliably prevent the kneaded material from adhering to the inside of the charging section 16 due to scattering or the like. There is no need to increase the distance between the first and second mixers, so that the mixer-1 itself can be configured very compactly.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is an enlarged sectional view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paste mixer 2 Mixing drum 15 Raw material input port 16 Input section 17 Piston body 19 Screw feeder 20 Valve body 21 Discharge port

Claims (2)

[Claims] 1. A mixing drum 2 constituting a mixer-1.
A substantially cylindrical input section 16 is communicably connected to a raw material input port 15 of the apparatus.
9 is connected so as to be freely communicable, and a piston body 17 is provided inside the charging section 16 so as to be able to move up and down. When the raw material is charged, the piston body 17 is raised to open the raw material charging port 15, and at the time of kneading. The piston body 17 is moved down to scrape off the deposits in the charging section 16 and the raw material charging port 1 is removed.
A raw material input device for a mixer, characterized in that the raw material input device is configured to close the block 5. 2. A valve body 20 is provided at a distal end of the raw material supply device 19 so as to open and close a discharge port 21 in conjunction with a lifting and lowering operation of a piston body 17. Item 1. A raw material input device for a mixer according to Item 1.