JPS5924343Y2 - scraper in mixer - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a scraper in a mixer.

More specifically, it relates to a scraper attached to a mixer equipped with stirring blades in a tank for the purpose of mixing, stirring, emulsifying, dispersing, heating and cooling cosmetics, pharmaceuticals, chemicals, synthetic resin powders, etc.

In order to achieve complete mixing and agitation, it is essential to ensure smooth movement of the materials introduced into the tank at all times.

In a mixer that lacks a scraper, a clearance occurs between the inner wall surface of the mixing tank and the stirring blade, and the so-called iron part becomes a dead space, which greatly impedes uniform mixing work. When the mixture is heated or cooled through the jacket, the presence of the clearance portion greatly impedes heat transfer to the mixture.

As described above, the presence of a scraper in a mixer is a member that cannot be blown in order to perform smooth mixing and stirring operations.

Therefore, effective operation of this scraper greatly affects the efficiency of mixing and stirring work.

Conventionally, a typical scraper is a spatula-shaped scraper that is moved while sliding in diagonal contact with the tank wall at a predetermined angle to scrape off deposits on the wall surface. In the case of a scraper, some of the mixed materials may be deposited on the back of the scraper, and when the scraper is moved in the opposite direction, the obliquely installed scraper may actually cause some of the mixed materials to be deposited on the back of the scraper. There were drawbacks such as the result of a stronger adhesion to the tank wall.

This idea consists of a support rod that extends from the top of the mixing tank toward the center of the bottom and moves along the inner wall surface, and a pair of rake faces on the left and right sides in the circumferential direction of the mixing tank. A block-shaped scraper is installed in multiple stages so as to be rotatable around this part, and when the support rod is moved, one of the edge parts of the scraping surface of the scraper on the inner wall surface side of the mixing tank is attached to the inner wall of the mixing tank. This device is designed to come into sliding contact with the wall surface, and this design reduces the amount of mixed materials that adhere to the scraper.
This invention provides a scraper that is efficient in many aspects, such as simplification of removing the deposits, uniform scraping during both forward and reverse rotation, and economical compatibility of the scraper. A specific example of a scraper in a mixer will be described with reference to the drawings.

A mixing tank 1 has a jacket 2 attached to the outer wall for passing a heating or cooling medium, and a head 5 that rotates above the tank 1 at a predetermined speed via a motor 3 and a speed reducer 4 is disposed. A stirring blade 6 that rotates and revolves around its axis is suspended, and the stirring blade is removably installed inside the mixing tank as the head portion rises.

On the other hand, the tip of the arm 7 extending from the head 5 has a cross section that extends from above the mixing tank 1 to near the center of the bottom of the tank and maintains a predetermined distance from the inner wall surface of the mixing tank 1. A circular support rod 9 is attached, and the support rod 9 is configured to rotate along the inner wall surface of the mixing tank in response to the rotation of the head 5.

A block-shaped scraper 10 having l pairs of left and right rake surfaces 11a, 11b in the circumferential direction of the mixing tank is attached to the support rod 9 in multiple stages in the vertical direction so as to be rotatable around the support rod 9. ing.

This block-shaped scraper 10 is made of synthetic resin, such as fluororesin and Teflon (trade name of Teupon Co., Ltd.), which have many properties suitable for scrapers such as wear resistance, heat resistance, elasticity, and lubricity. In plan view (
It has a trapezoidal or isosceles triangular shape (when viewed from above the tank), and as a means for rotatably attaching the trapezoidal scraper to the support rod 9, a notch 13 is made in the inner surface 12 (the surface facing the center of the tank) of the trapezoidal block and further back therein. A cylindrical hole 13' passing through the block in the vertical direction is formed in the block, and the support rod 9 is fitted loosely into the cylindrical hole 13' while opening the notch 13 connected to the cylindrical hole 13'.

On the other hand, the cylindrical hole 1 is
A horizontally long through hole 15 communicating with the support rod 9 is bored into the hole 15, and a protrusion 16 that projects toward the inner wall surface of the tank of the support rod 9 is fitted into the hole 15, thereby allowing the support rod 9 to rotate. The scraper 10 mounted on the support rod is prevented from moving in the vertical direction on the support rod, and the scraper 10 is moved around the support rod 9 by the engagement between the end of the horizontally elongated through hole 15 and the protrusion 16. The amount of rotation is naturally regulated, and the lower edge portions 17a, 17b of either one of the scrapers 10 are configured to come into contact with the inner circumferential surface of the tank at the maximum rotation.

The scraper 10 shown in FIGS. 6 and 7 is a modified example of the scraper having an isosceles triangular shape in plan view.

In addition, a plurality of support rods 9, 9, for example, two support rods are installed in relative positions in the tank (Fig. 2), and a scraper 10 on the support rods is installed.
It is also possible to install the two support rods by alternating their positions one by one so that the area to be scraped by the scrapers on the two support rods is distributed over the entire inner wall of the tank. The scraper itself can be stabilized by reducing the resistance that it receives from the mixture.

This device has the above-mentioned structure. First, when the support rod 9 to which the scraper 10 is attached is rotated in the counterclockwise direction in FIG.
It rotates in the direction of the hour hand around the support rod 9, and the edge 172 comes into contact with the inner wall surface, and as the support rod 9 rotates, it scrapes off a part of the adhering part of the mixture that has adhered to the inner wall surface and removes the peeled adhesion. The kimono is sequentially reintroduced into the mixture using the scooping surface 11a as a guide.

At this time, although some of the mixed material tends to adhere and accumulate on the opposite rake surface 11b, when the support rod 9 is reversed and rotated in the direction of the hour hand in FIG. The scooping surface 11b receives the resistance of the mixture and rotates in the counterclockwise direction around the support rod 9, and this time the opposite edge 17b comes into contact with the inner wall surface, and the same scraping operation as described above is continued (No. (At the scraper position indicated by the imaginary line in Figure 3).

Naturally, the deposits on the rake face 11b easily fall off from the scraper due to the resistance of the mixture and are reintroduced into the mixture.

This idea responds to the forward and reverse rotation of the support rod to which the scraper is attached, and the scraper is automatically set in the most suitable state for scraping work in response to the resistance of the mixture. Uniform scraping of deposits is ensured even when the scraper rotates, and the deposits on the back of the scraper are automatically scraped off during the series of scraping operations. It can be easily removed without any removal work.

In addition, the through hole of the scraper fits into the protrusion from the side of the support rod, ensuring the rotational position of the scraper is regulated for the most efficient scraping off of deposits, and the center of the scraper is The existence of this protrusion that engages with the part has the effect of reinforcing the scraper itself at the center, which is subject to large resistance from the material to be mixed. Also, the block-shaped scraper can be easily attached to and detached from the support rod, and this scraper is interchangeable. This block-shaped scraper has the advantage of being highly durable, allowing immediate response to local damage to the scraper device, and being economical.This block-shaped scraper also has the advantage of being extremely easy to clean, maintain, and inspect after work.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of a mixer implementing this invention, Fig. 2 is a view corresponding to Fig. 1 showing another embodiment, and Fig. 3 is a diagram corresponding to Fig. 1 showing another embodiment.
The figure is an enlarged cross-sectional view taken along line A-A in Figure 2, Figure 4 is a bottom view of the scraper, Figure 5 is a cross-sectional view taken along line B-B in Figure 4, and Figures 6 and 7 are FIG. 4 is a diagram corresponding to FIG. 3 showing other embodiments; In the figure, 1 is a mixing tank, 7 is an arm, 9 is a support rod, 10 is a scraper, 11 a, 11 b are rake faces, 13 is a cylindrical hole,
15 is a horizontally elongated through hole, 16 is a projection, and 17a and 17b are flies.

Claims (2)

[Scope of utility model registration request] (1) A support rod that extends from the top of the mixing tank toward the center of the bottom and rotates along the inner wall surface, and a block-shaped scraper that has a pair of rake surfaces formed on the support rod in the circumferential direction of the tank. are mounted in multiple stages so as to be rotatable around the part, and so that when the support rod is rotated, one edge part of the rake face of the scraper on the inner wall surface side of the mixing tank slides into contact with the inner wall surface. Scraper in configured mixer. (2) The scraper rotatably attached to the support rod is
The scrapers in the mixer according to claim 1 of the patent registration claim, in which the position of the scraper is regulated by fitting protrusions protruding from the side surfaces of the support rods into oblong holes drilled in the inner wall surface of the mixing tank of the scraper. .