JPS6078546A - Method and apparatus for cooling hollow roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is used in particular for roller crushing towers for crushing cocoa or chocolate lumps, paints and similar processed materials. The present invention relates to a method and apparatus for cooling a hollow roller having a fixed cooling supply pipe guided into the roller at the longitudinal axis of the roller through a coolant discharge hole.

[Conventional technology and problems]

In order to cool rotating hollow rollers, it is generally known that water is used as a coolant to flow through the roller tube. In the known device for cooling roller tubes, the cooling water is supplied by inverting one of the roller legs supporting the roller tube, in which case the roller leg is formed hollow and the cooling water is supplied through the roller leg. into a fixed supply pipe led concentrically to the F hand hole of the. The inlet pipe is generally formed as a spray pipe and is provided with a number of gutter openings through which the cooling water flows into the roller interior chamber.

To ensure that the entire roller tube is cooled as evenly as possible, the cooling water inlet tube that runs inside the roller is fitted with baffles, stirring blades, cooling channels, or similar inserts that extend in trenches near the roller tube. It is also known that The stiffening structure must first rapidly dissipate the heat generated and provide efficient circulation, mixing and transport of the coolant. The discharge of the cooling water from inside the roller is carried out through a longitudinal hole in the roller leg formed hollow at a free outlet.8 Cooling water drain is then formed from the roller leg hole and the inlet pipe due to its gravity and internal pressure. The i+circle 11n is washed with a stream J1, in which case the discharge opening in the roller leg is located completely below the liquid level.

In the case of cooling systems with a central inlet tube led through the roller legs and with or without auxiliary integration inside the roller, the internal pressure created by the compression of the air in the hollow roller causes the liquid to flow through the roller. It is unavoidable that the surface level will rise.e The liquid level and internal pressure will rise as the cooling water flows, and the inflowing cooling water and outflowing cooling water will be in a free balance. The time increases. This process is intensified in the case of rotating rollers by the fact that air is always carried along with the exiting cooling water, which causes the liquid level to rise further and the rollers to be completely filled with cooling water.

A common drawback of known cooling devices of this type is that the cooling effect is significantly reduced due to the temperature difference between the rollers and the cooling water. Furthermore, the heat transfer coefficient at the inner wall of the roller is continuously reduced by the turbulence of the cooling water and by the increasing thickness of the entrained water film.

[Purpose of the invention]

The invention aims to eliminate the drawbacks of the cooling effect caused by an increase in the liquid level and to reduce the consumption of cooling water.

The object of the present invention is to provide a method and device for cooling a hollow roller, which can maintain the level of cooling water inside the roller at a constant low level.

[Summary and effects of the invention]

According to the invention, this problem is solved by supplying a gaseous medium to the inner chamber of the roller in addition to the cooling water, and in which the amount of this gaseous medium per accretion time is greater than the amount escaping together with the cooling water, and the liquid level in the inner chamber of the roller is This is achieved by keeping the level constant below the upper edge of the roller discharge opening.

Furthermore, in accordance with the present invention, it is proposed to use a constricted flow that is continuously supplied as a gaseous medium, and that the amount of air flow is in the range of 70 cm to 6 cm of the amount of water supplied. propose. The apparatus used for carrying out the method of the invention includes a cooling water supply pipe in which a free-line feed pipe is arranged, projecting into the interior of the roller parallel to this cooling water supply pipe; It is also characterized by the fact that the inertia line extends over 50% of the inner chamber of the roller. 7 Based on the present invention! ! ′
- Another feature of our company is that the empty bag 1" in the inner chamber of the roller is equipped with an air outlet υ (10) formed as a nozzle at the end, and the air f1 is located outside the hollow roller of the feed tube. The end is connected to the idle conveying pump via the supply pipe.

It is also included in the present invention that a check valve is provided in the supply pipe.

The advantages obtained by the invention are, in particular, that by increasing the cooling effect, the overall capacity of the roller mashing machine is increased and cooling water can be saved. .

〔Example〕

The present invention will be described in detail below based on the embodiment shown in FIG.

The hollow roller consists of a roller tube l and a lateral part formed as a tongue shaft fixed to the end face of the roller tube l and rotating in a bearing (not shown) '2! Reteiru. In order to cool the hollow roller, a longitudinal hole ≠ used as a cooling water outlet is provided in the shaft part, and the cooling water outlet opening is guided inside the roller at the longitudinal axis of the roller through the longitudinal hole ζ. The radial fixation of the water inlet pipe j is effected by means of guide bodies 6.7. In the inner chamber of the roller, the cooling water inlet pipe tH has a plurality of cooling water outlet openings r'6 arranged at equal intervals. On the other hand, an air conveying pipe located parallel to the cooling water inlet pipe j and fixed to this cooling water inlet pipe j is led into the interior of the hollow roller. The air conveying tube, which projects into the interior of the roller, starts from the side of the shaft λ and ends just within the interior of the roller, and is provided with an air outlet opening 10 in the form of a nozzle at its end face. The end located on the outside I of the hollow roller of the empty packaging agitation feed pipe is the supply pipe//
Connected to the pneumatic conveyor ponzo/co via. The supply piping l/ is equipped with an air transfer pump l,! in case of any disturbance in the air supply. A check valve/3 is provided to prevent cooling water from flowing backwards. Based on the present invention, the sum of the gravity of the cooling water and the pressure of the air is
An amount of air per unit time is sent into the interior of the hollow roller by the empty conveying pump/2 to ensure that it acts on the liquid level located on the underside of the upper bond. This -Fl is achieved because the amount of air supplied is greater than the amount of air discharged together with the cooling water. The diameter of the k-toe roller is 001Lm and the working length is /100
For hollow rollers of the type, an air pressure of up to 73 kPa and an air volume of up to -2-I x 10 m'/B are required.

[Brief explanation of the drawing]

The drawing is a schematic cross-sectional view of a cooling device for hollow rollers according to the invention. C... Roller tube, C, 3... Shaft, + Longitudinal hole of carapace,!
...Cooling water inlet pipe, 6, 7...Guiding body, g...Cooling water outlet opening, Ri...Air conveying pipe, 10...Air mouth opening, //...Air supply piping , /2 River air conveyance pump, 13... Check valve 0 Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] /) A method for cooling a hollow roller, in which the cooling water in all free internal chambers of the hollow roller is not forcibly guided and has a free outlet; A gaseous medium is supplied into the internal chamber, and the amount of this gaseous medium per unit time is greater than the amount that escapes with the cooling water, such that the liquid level in the roller internal chamber is above the upper edge of the cooling water outlet opening. A method for cooling a hollow roller, characterized in that it is held constant at the bottom. 2) A method according to claim 1, characterized in that a continuously supplied air stream is used as the gaseous medium. 3) A method according to claim 1 or 2, characterized in that the air flow rate is in the range from 70% to 16% of the amount of water supplied. A device for cooling a hollow roller by means of a fixed cooling water inlet pipe which is guided into the interior of the roller at the longitudinal axis of the roller through a coolant outlet hole in the shaft leg and has a radially oriented cooling water outlet opening. In the cooling water inlet pipe (j), an air conveying pipe (ri) thrusted inside the roller is arranged parallel to the cooling water inlet pipe (S), and this air conveying pipe (
1. A hollow roller pecking device characterized in that the hollow roller extends over % of the inner chamber of the roller. j) The device according to item 7 of the specification, characterized in that the air conveying pipe in the inner chamber of the roller is provided with an air outlet opening (10) formed as a nozzle in the end face. 6) The end of the air conveying pipe (also on the outside of the hollow roller) is connected via the supply pipe (//) to the gust conveying pump (/,
2) or #'1. The device described in j. 7) The device according to claim 6, characterized in that the supply line (//) is also provided with a check valve (13).