JPH0316656A - Method and device for pulverizing in vacuum or anaerobic gaseous atmosphere - Google Patents

Abstract

PURPOSE:To prevent the generation of the oxidation and change of properties of food particularly at the time of pulverizing of the food and to prevent the explosion at pulverizing a metal into powder by pulverizing a matter between grinding wheels held in a vacuum or anaerobic gaseous atmosphere and further, storing the matter in the continuous atmosphere. CONSTITUTION:Raw materials are supplied between the stationary grinding wheel (a) existing in the vacuum or anaerobic gaseous atmosphere and the rotary grinding wheel (b) rotating opposite thereto, by which the raw materials are pulverized in the vacuum or anaerobic gaseous atmosphere. The materials are discharged simultaneously from between the two grinding wheels and are stored in a storage tank 28 in the atmosphere continuous therewith. The pasty food materials of the food with which the oxidation and the change of properties are vigorous are inexpensively produced without having such deterioration in properties and further, the dry grinding down into powder having the danger of explosion is extremely inexpensively executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a process for converting raw materials into ultrafine particles in order to produce fine powder or paste food materials from high hardness materials, livestock bones, etc. in a vacuum or anaerobic gas atmosphere. This invention relates to a grinding method and apparatus.

[Prior art and problems to be solved by the invention] For example, it is an extremely important technology in the food industry to efficiently grind meat and bones that have been coarsely ground in advance and process them into a paste at low temperatures. . In order to use these as foods, it is necessary to finely grind the living tissues without oxidation or chemical changes in order to improve the flavor and absorption into the human body.

Conventionally, this type of grinding device consists of a set of grinding wheels, which have a fixed grindstone at the top and a rotary grindstone at the bottom opposite to it with a gap installed in the grinding chamber. The raw material is supplied from a hopper between upper and lower grindstones, and is ground through the gap between the grindstones and turned into an ultra-fine powder. These whetstones are integrally formed with a vitrified abrasive grain plate that has no pores.

However, for example, the larger the body size of animal bones, the more calcium they contain and the harder they become.In particular, the backbones and ribs of large livestock such as pigs and cows are extremely hard, and the difference in hardness compared to a general Vitri 7-eyed whetstone is comparable. As a result, grinding performance deteriorates due to wear of the sharp edges of the grinding surface of the whetstone, and compression during grinding. Intense thermal energy such as shearing and rolling friction causes a rapid temperature rise. Therefore, although these raw material bones are frozen at about -20°C in advance, in addition to the coarse crushing process using a chitapper, etc., the above-mentioned grinding process requires three steps to the final stage before it can be made into the desired paste food. If these are processed in a continuous process, the temperature will rise to around 50°C, and as a result, proteins, lipids, etc. in the raw materials will deteriorate due to oxidation, making them unsuitable as food materials.

For this reason, conventionally, after the coarse crushing process, the blocks are refrozen, cooled to around -15°C, and then put into a crusher, a certain amount of ice or cooling water is added, and the final grinding process is carried out.
Paste ingredients with a temperature of around 5 to 30"C were obtained.

As a further improvement on this method, by using a grinding device equipped with a nonporous fixed grindstone equipped with a diamond grindstone and a rotating grindstone, the grinding process can be carried out at room temperature. A complete paste-like food product was obtained under normal pressure and at a temperature of about 2° C. in two milling steps. That is, in the vitrified grinding wheel, the clearance between the upper and lower grinding wheels is set to 0. 2mm, and 0.11III1 in the second grinding step. And in the third grinding step, 0
．． 06mm, but with the diamond grinding wheel, by setting a clearance of 0.2 in the rough finishing of the first grinding process, there is almost no texture, and the heating temperature is 1/2 that of the conventional one (
10° C.) or lower, and by setting a clearance of 0.1 in the refinishing process in the second grinding step, a better paste could be obtained.

It is clear that this significant improvement in grinding efficiency is due to the excellent grindability of diamond abrasive grains.

In addition, when producing metal powder by finely pulverizing AQ, Mg, and their alloys, etc., the conventional method was to use a jet pulverizer or impact type (hammer mill, pin mill) pulverizer, etc.; All of these require restricted rotation, so when the metal powder becomes fine particles, depending on the air mixture, the particles may become charged or discharged, inducing an explosion, which poses the risk of an accident.

Furthermore, when such metal powder is obtained by a grinding machine using a vitrified grinding wheel as described above, the malleability of the metal and the hardness of the vitrified grinding wheel are relatively close to each other, so the wear of the abrasive grains is large. As the grinding performance of the whetstone deteriorates, a huge amount of frictional heat is generated, which sticks to the surface of the whetstone in the form of a film, causing the film-like metal of the upper and lower whetstones to seize together, resulting in peeling of the whetstone surface and overloading of the rotary whetstone motor. Motor burnout due to There was a danger that the device itself could be destroyed.

Also, as mentioned above, there was a risk of explosion due to the rise in temperature of the powder and its mixing with air.

In this case as well, we conducted a grinding test of the metal powder using a grinder using a diamond grinding wheel, and found that due to diamond's excellent grindability, heat generation was kept to a minimum, and even at room temperature and pressure, relatively small quantities could be produced. was possible. However, when operated for a long time, the effect of frictional resistance gradually increases and the temperature gradually increases, so there was still a risk of explosion.

[Means to solve the problem]

This is the invention. In view of this, as a result of various studies, we have developed a grinding method and device that does not cause oxidation or deterioration when grinding foods, and does not pose the risk of explosion when grinding metal powder.

That is, the method of the present invention grinds the raw material in a vacuum or in an anaerobic gas atmosphere by supplying the raw material between a fixed grindstone in a vacuum or in an anaerobic gas atmosphere and a rotary grindstone that rotates relative to the fixed grindstone. It is characterized in that it is crushed and discharged from between both grinding wheels, and then stored in a continuous atmosphere.

Another method of the present invention is to supply the raw material under a vacuum or anaerobic gas atmosphere between a fixed grindstone and a rotary grindstone that rotates relative to the fixed grindstone, which is in a continuous atmosphere. The grinding process is characterized by grinding the grinding material in a vacuum or anaerobic gas atmosphere, discharging it from between both grinding wheels, and storing it in a continuous atmosphere.

The apparatus of the present invention also includes a grinding chamber equipped with a fixed grindstone and a rotary grindstone that rotates relative to the grinding wheel, and a storage tank for storing the raw material ground and discharged by these two grindstones. A grinding device is characterized in that the grinding chamber and storage tank are communicated with each other to maintain them in a vacuum or anaerobic gas atmosphere, thereby grinding, discharging, and storing raw materials in a vacuum or anaerobic gas atmosphere. That is.

Furthermore, another apparatus of the present invention includes a raw material supply hopper, a grinding chamber that includes a fixed grindstone and a rotary grindstone that rotates relative to the fixed grindstone, and that grinds and discharges the raw material supplied from the hopper. In a grinding device consisting of a storage tank for storing raw materials, the hopper, the grinding chamber, and the storage tank are all communicated to maintain them in a vacuum or anaerobic gas atmosphere.
Storage of raw materials in a hopper in a vacuum or anaerobic gas atmosphere. supply. Grinding. It is characterized by being discharged and stored in a storage tank.

〔Example〕

Next, the present invention will be explained by way of an example.

Example 1> Fig. 1 shows a grinding apparatus of the present invention. That is, in the upper part of the grinding chamber (1), there is provided a non-porous fixed grindstone (a) vacuum-deposited with diamond, which has an annular groove (2) formed on the upper surface for supplying a coolant and a grinding surface formed on the lower surface. A grinding wheel fixed plate comprising a porous rotary grinding wheel (b) having a grinding surface on which diamond is vacuum-deposited opposite to the grinding surface of the fixed grinding wheel (a), and scrapers (3) arranged on the outer periphery of the lower surface. (4) was attached to the top using the fixture (5). The grindstone fixing plate (4) and the fixture (5) are fixed to a rotating shaft (6), and the raw material supplied into the grinding chamber (1) is attached to the upper part of the rotating shaft (6). (a)(
The scraping part (7) that is fed into the grinding machine (b) is screwed together, and a cap nut (8) is attached to the upper end. The lower part of this rotating shaft (6) is held in the main body of the device via a bearing (9), and is further connected to an interlocking shaft (11) connected to the drive shaft of the main motor (auxiliary) by a coupling (lO). There is.

In addition, the outside of the grinding chamber (1) is covered with an annular jacket (l4) equipped with a cooling liquid supply port (l2) and a cooling liquid discharge port (l3) and in which the cooling liquid is constantly circulated. ) A material supply hopper (15) having a substantially inverted truncated cone shape was attached to the upper end with good airtightness via a seal ring (24). ．． The upper lid (l6) of the hopper (l5) is
5) It is attached to the main body with a seal ring (24) to maintain airtightness, and a hopper (l6) is attached to the upper lid (l6).
5) was equipped with an opening/closing valve for the inlet (17) through which raw materials were introduced.

Then, a press-in spiral blade (19) for force-feeding the raw material in the hopper (l5) to the grinding chamber (1) is provided in the hopper (l5) and rotated by a stirring motor (112> attached to the upper lid (16)). They were connected by a shaft (20).

In addition, on the side of the grinding chamber (1) there is a discharge port (2L) for discharging the raw materials (ground material) ground by the upper and lower grindstones (a) and (b).
Further, the discharge port (2l) and a storage tank (28) for storing the ground material were connected by a joint pipe (30) via a seal ring (24>.And this storage tank (28)
A stirring blade (29) connected to a stirring motor (mt) is installed inside the tank to store the ground material while stirring, and a rotary valve (3L) is installed at the lower end of the storage tank (28) to send the ground material to the next process. Established.

Furthermore, in such equipment, all processes of raw material storage, grinding, and grinding product storage are carried out in an inert gas atmosphere. A raw material supply hopper (15). Grinding chamber (1
) and storage tank (28) were fitted with an inert gas supply port (25), and these were connected to an inert gas supply tank (26). In addition, a degassing suction port (18) was provided in the hopper (15) and the storage tank (28), and these were connected to a vacuum bomb (27) so that all the above steps of the apparatus could be carried out under vacuum or reduced pressure.

Using the above-mentioned grinding device, low-temperature wet grinding was carried out as follows to produce mallow remulsion (registered trademark name for paste ingredients of fresh pork and cow backbones and ribs).

That is, first, the outer peripheral surface of the grinding chamber (1) is covered with an annular jacket (14).
), and liquefied carbon dioxide gas is supplied to the annular groove (2) of the fixed whetstone (a) from the coolant supply port (22), and is discharged from the coolant discharge port (23) to cool the fixed whetstone. (a)
Keep it cool. Then, low-temperature nitrogen gas was supplied into the apparatus from the inert gas supply tank (26) to create a low-temperature anaerobic gas atmosphere inside the apparatus. Then raw material input port (l7)
Coarsely crushed pork, beef bones, etc. are input and ground to produce Mallory Margin a. This was then stored in a storage tank (28).

The obtained mallow remulsion is
The 00% non-porous structure makes it easy to achieve a sterilization effect, resulting in high quality and hygienic results.Since the grinding process is simplified by one step, the initial cost and running cost are greatly improved, resulting in a low cost product. A mallow paste was obtained.

<Example 2> In the apparatus shown in Fig. 1 above, conventional nonporous grindstones are used instead of diamond grindstones as the upper and lower grindstones (a) and (b), and food materials whose quality changes rapidly such as apples and bananas are used as raw materials. We selected these and tried to make them into a stable paste.

Apples and bananas brown extremely quickly due to oxidation, so even if they are made into a paste at room temperature and pressure, they will brown and deteriorate in a short period of time.

Conventionally, this type of pasting involves grinding the paste in the atmosphere, storing it in a storage tank, and evacuating and vacuuming the storage tank to remove air bubbles mixed into the paste. However, once the air bubbles were mixed in. It was extremely difficult to remove such a viscous paste by degassing.

Therefore, using Fig. 1, the inside of the device is degassed using a vacuum pump to create a reduced pressure state, and apples and bananas, which are raw materials, are pressed into the hopper a9, ground, and stored in a storage tank (28). A tube-shaped container was filled with a lower rotary valve (3 liters).

With this device, it is possible to completely prevent air bubbles from being mixed into the filled apple/banana paste, which is the case with conventional methods, resulting in quality problems such as browning. There was no deterioration at all.

Note that Figure 2 shows the case of a wet grinding apparatus in which the storage tank (28) does not have stirring blades and only vacuum deaeration equipment is installed inside the apparatus. Select as appropriate depending on the physical properties of the crushed material.

Example 3 In place of the device shown in FIG. 1, a supply hopper as shown in FIG.
The raw material is supplied to the raw material supply spiral blade (33) attached to the upper lid (16) via the valve (32) provided on the upper lid (16).
In addition, the hopper (1) is equipped with a kumata-shaped stirring blade (34) connected to the stirring motor (1), and the upper and lower grinding wheels (a) and (b) are made of superimposed materials such as diamond or boron nitride. A grinding device using a hard grindstone was constructed. Then, dry grinding was carried out while maintaining the inside of the apparatus in a vacuum or inert gas atmosphere.

That is, A0 60wl%-Mg 40wt by the above device.
% alloy 280mesh alloy powder was manufactured. Although this alloy has a strong oxidizing property because it contains a large amount of Mf, the obtained alloy powder had no danger of explosion, and the device could be operated continuously for a long time.

In the case of such a dry grinding apparatus, depending on the physical properties of the ground material, it is also possible to configure the apparatus without providing stirring blades in the storage tank (28) as shown in FIG. 4.

〔Effect of the invention〕

As described above, according to the present invention, paste-like foodstuffs that are subject to severe oxidative deterioration are free from such deterioration and are inexpensive. It has remarkable effects, such as the fact that it can be manufactured in a number of steps, and that dry milling of potentially explosive powder can be carried out extremely safely.

[Brief explanation of the drawing]

1 to 4 are side sectional views of an apparatus showing one embodiment of the present invention. l-... Grinding chamber 2... Annular groove 3... Scraping blade 4... Grindstone fixing plate 5-... Mounting bracket 6-- Rotating shaft 27-- Vacuum bomb 28-... Storage tank 29 ... Stirring blade 30--Joint pipe 3l...-Rotary valve 32--Valve 33...Raw material supply spiral blade 34...Kumada-shaped stirring blade rrLt...Main motor m,-- Stirring motor a...Fixed grindstone b...One rotation grindstone 7 - Scraping part 8...One bag nut 9...Bearing 10...Coupling 11-...Interlocking shaft l2...Cooling liquid supply Port l3...Cooling liquid outlet 14...Annular jacket l5:...Raw material supply hopper 16...Top lid 17...1 Input port l8...Degassing suction port l9...Press-in helical blade 20 ... Stirring rotation shaft 2l, one discharge port 22, one refrigerant supply port 23, -- refrigerant discharge port 24, -- seal ring 25, ... inert gas supply port 2B, inert gas supply tank procedure dispute Proposed text (method) Contents of amendment (1) The title of the invention on page 1 of the specification is corrected as follows. "Method of grinding in vacuum or anaerobic gas atmosphere and device 1. Indication of the case: 1999 Patent Application No. 153174" 2. Title of invention: Method of grinding in vacuum or anaerobic gas atmosphere and device 3
．． Relationship with the case of the person making the amendment Patent applicant address 1-12-24 Honmachi, Kawaguchi City, Saitama Name
Masuko Sangyo Co., Ltd.4.

Claims (4)

[Claims] (1) By supplying the raw material between a fixed grindstone in a vacuum or an anaerobic gas atmosphere and a rotary grindstone that rotates relative to the fixed grindstone, the raw material is ground in a vacuum or an anaerobic gas atmosphere and A grinding method in a vacuum or anaerobic gas atmosphere, characterized by discharging from between both grinding wheels and storing in a continuous atmosphere. (2) By supplying the raw material under a vacuum or anaerobic gas atmosphere between a fixed grindstone that is in a continuous atmosphere and a rotary grindstone that rotates relative to the raw material, A method of grinding in a vacuum or anaerobic gas atmosphere, characterized by grinding in an atmosphere, discharging from between both grinding wheels, and storing in a continuous atmosphere. (3) In a grinding device consisting of a grinding chamber equipped with a fixed grindstone and a rotating grindstone that rotates relative to the fixed grindstone, and a storage tank for storing raw materials ground and discharged by these two grindstones, the grinding chamber A vacuum or anaerobic gas atmosphere characterized by grinding, discharging, and storing raw materials in a vacuum or anaerobic gas atmosphere by communicating with a storage tank and maintaining them in a vacuum or anaerobic gas atmosphere. Milling equipment. (4) A raw material supply hopper, a grinding chamber that is equipped with a fixed grindstone and a rotary whetstone that rotates relative to the hopper and grinds and discharges the raw material supplied from the hopper, and a storage tank that stores the discharged raw material. In a grinding device consisting of, the hopper, the grinding chamber, and the storage tank are all communicated and kept in a vacuum or an anaerobic gas atmosphere, thereby storing the raw material in the hopper in a vacuum or an anaerobic gas atmosphere, A vacuum or anaerobic gas atmosphere milling device characterized by feeding, milling, discharging and storing in a storage tank.