JPH0322184Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a table feeder that can quantitatively supply powder and granules and perform stable continuous operation.

[Prior art]

As a prior art, Japanese Patent Application No. 100756 (1983)
-244715). This invention is particularly aimed at powder and granular materials that tend to stick together or contain agglomerated particles, and as shown in FIGS. By rotating the rotary table separately from the rotary table 1, the feeding from the hopper 11 to the rotary table 1 surface is facilitated, and the raw material powder is compacted and packed into the notch groove 3 formed on the rotary table 1 surface. This made quantitative supply possible.

[Problem that the invention attempts to solve]

By the way, in this table feeder, in order to form the notch groove 3 on the surface of the rotary table 1, a spacer 2 having a notch portion corresponding to the notch groove 3 and a scraper portion 10 for scraping is placed on the rotary table 1. Due to the structure in which the rotary table 1 slides in contact with the fixed spacer 2, there is a problem that raw material particles are likely to get caught in the mating surfaces of both members. Ta.

Countermeasures have been taken to improve the machining accuracy of the contact surfaces of the rotary table 1 and the spacer 2, and to increase the pressure on the contact surfaces between the two members, but these methods are expensive due to manufacturing costs and Considering the wear of sliding surfaces caused by powder and granules, a more fundamental solution to the problem was desired. The present invention relates to improvements for that purpose.

[Means to solve the problem]

In the present invention, a raw material hopper is disposed above the rotation center of the rotary table, a discharge tube is fitted and connected to the lower opening of the hopper separately from the hopper, and the discharge tube is connected to the rotary table. By holding the hopper at an appropriate distance from the upper surface and rotating it, it is possible to smoothly feed the raw material from inside the hopper. A concentric circular platform having an appropriate level difference is formed on the upper surface, and the discharge tube is placed and held on the circular platform so that a part of the opening is closed by the circular platform. .

[Effect]

In the table feeder of the present invention, firstly, the material in the hopper is alleviated or suppressed in the vicinity of the opening by the compaction phenomenon caused by the weight of the material above in a stationary state before being sent out from the opening, thereby eliminating the crosslinking phenomenon and rat holes. The aim is to prevent the causes of blockages such as, or to release the blockages.When the discharge pipe provided at the lower opening of the hopper is rotated, the powder layer itself packed from the hopper to the discharge pipe is sheared at this joint. Ru. This shearing action transmits motion from the nearby raw material to the raw material in the lower opening of the upper hopper, smoothing the contact between the raw material particles.
Suppresses adhesion and aggregation between particles and walls, as well as between particles,
It also prevents the generation of aggregated souls and smoothes the downward flow. From this state, the table rotates in the direction of the arrow in the figure, and when supply and discharge are started, the relative movement of the raw material particles becomes active, and more stable and smooth feeding becomes possible. Second, because the discharge tube is located at a position off the center of the rotary table, the entire surface of the table in contact with the lower opening moves in one direction, and compared to the central position, the material is To be able to receive a large transport force quickly.

Thirdly, between the rotating tables, the circular platform formed for the purpose of holding is placed so as to partially block the lower opening of the discharge tube, so it has excellent feeding ability as mentioned above. Despite this, raw materials are subject to restrictions on their delivery. As a result, an appropriate compaction effect is applied to the raw material within the discharge tube, and the density of the raw material fed out can be made uniform. In addition, the circular platform has the function of using its stepped portion to grind up the raw material flowing out from the lower part of the discharge tube, preventing agglomeration within the discharge tube, and ensuring smooth and stable delivery to the rotary table. .

As described above, in addition to the first action due to the rotation of the ejection pipe and the second action due to the off-center position of the rotary table, the third action is performed by the circular platform formed on the rotary table surface. This function enables a fixed amount of raw material to be fed smoothly and stably, and the raw material placed on the rotary table is then scraped off by a scraper and supplied to the next process.

[Effect of consideration]

As described above, the effects of the present invention are that it is possible to secure a flow path in the hopper by suppressing the adhesion, aggregation, and coagulation of raw material particles that are likely to occur in the hopper, which can lead to blockages such as rat holes, and to secure a flow path in the hopper. Smooth and stable feed of raw materials can be obtained and processing capacity can be increased. In addition, for the raw material sent onto the rotary table surface, the circular platform has an appropriate compaction filling effect, which makes it possible to equalize the raw material density and constant the delivered volume. It is possible to send out a fixed amount, and to be able to supply and discharge a fixed amount.

Furthermore, the circular platform formed integrally with the rotary table instead of the spacer and notched groove has no gap for raw material particles to enter, and therefore, the entire amount can be supplied and discharged. The structure is simple, and the powder contact part in particular has the advantage of being simple and easy to maintain and clean.

〔Example〕

An embodiment will be described with reference to FIGS. 1 and 2. Reference numeral 15 denotes a machine base, on which the rotary table 1 is held and a transmission 13 and a transmission 1 for rotating it are mounted.
4 is installed. At the center of the upper surface of the rotary table 1, a circular platform 2 having an appropriate step is formed. A cylindrical raw material hopper 11 provided above the rotary table 1 is held by a bracket 16 at an appropriate height at a position off the center of rotation of the rotary table 1, and its lower opening 1 is held at an appropriate height.
8, a right cylindrical discharge tube 4 having a slightly larger diameter is fitted and connected thereto. The dimensions of the gap and the overlapping portion between these two members are sufficient as long as they allow ventilation with the inside of the discharge tube 4 and prevent raw material from leaking. Next, the discharge pipe 4
is rotated by four receiving wheels 7, two each rotatably attached to two rotating shafts 8a and 8b, and a belt 6. These two rotating shafts 8
One of a and 8b, 8a, is attached with a pulley 9 as a drive shaft, and is connected to a transmission and an electric motor (not shown) via a belt to transmit rotational driving force, and the other 8b is a driven shaft, which is used for discharging via a receiving wheel 7. It supports the cylinder 4. Note that the rotating shaft 8b is omitted in the figure. These rotating shafts 8a,
8b is held by brackets 16 and 17. Further, to support the discharge tube 4 in the vertical direction, a ring 3 made of a material with low frictional resistance is attached to the lower part of the discharge tube 4, and on the other hand, an appropriate step h is provided at the center of the upper surface of the rotary table 1. A circular platform 2 is formed, and a discharge tube 4 is placed on the circular platform 2 so that a portion of its lower opening is closed. The level difference h of the circular platform 2 and the degree of obstruction of the lower opening of the discharge tube 4 affect the supply and discharge amounts as well as the rotational speeds of the rotary table 1 and the discharge tube 4, and these factors must be considered in balance. The design may be changed as appropriate. For example, the bottom corner of the circular platform 2 may have a slightly curved surface to prevent the material from remaining when discharging the raw material. Next, near the lower openings of the discharge tube 4 and the hopper 11, elastic plate pieces 5a and 5 are provided.
b is attached parallel to the lower opening surface. This elastic plate piece 5a is effective for scraping out the raw material when it is running low in the discharge tube 4, or for loosening the raw material in the shape of a shell.On the other hand, the elastic plate piece 5b on the hopper 11 side This is effective in preventing the raw materials in the hopper 11 from rotating together due to the rotation of the discharge tube 4 and in supporting the powder pressure in the hopper 11 appropriately. The scraping surface of the scraper 10 that scrapes off the raw material is a rotary table 1 including the circular base portion 2.
Although it is formed and arranged according to the shape of the scraping surface, measures can be taken to both the material and the shape of the scraping surface to make scraping off the raw material smooth. or,
The guide 12 is provided on the rotary table 1 so as to surround the outside of the discharge tube 4, and is used to prevent the raw material flowing out from below the discharge tube 4 from falling directly from the rotary table 1 or from spreading too much.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIGS. 3 and 4 show a conventional example. In the figure, 1... rotary table, 2... circular platform, 3... ring, 4... discharge tube, 5a, 5b
...Elastic plate piece, 10...Scraper, 11...Hopper, 12...Guide, 18...Downward opening, h...
There is a step.

Claims (1)

[Scope of utility model registration request] A raw material hopper 11 is arranged above the center of rotation of the rotary table 1, and another discharge tube 4 having an inner diameter larger than the outer diameter of the hopper 11 is fitted and connected to the lower opening 18 of the hopper 11. The discharge tube 4 is rotated by being pressed and held by a plurality of receiving wheels 7 attached to a pair of drive shafts 8a and driven shafts 8b, and a belt 6 that engages these drive shafts 8a, driven shafts 8b, and discharge tubes 4. At the same time, a concentric circular platform 2 having an appropriate step h is formed on the upper surface of the rotary table 1, and the discharge tube 4 is slidably placed on the surface of the circular platform 2 including the step h. A table feeder characterized in that the load in the axial direction is held by the table feeder.