JPS61149670A - Shaft seal method in concrete mixer - Google Patents

Abstract

PURPOSE:To keep good the quality of ready-mixed concrete and mortar by using water as a seal medium sealed in an end face seal. CONSTITUTION:A floating-type end face seal 3 is interposed between a rotary shaft 1 and a casing 2 of a concrete mixer. Desired pressurized pure water is injected at a fixed pressure in one hollow portion 13 through a passage 15, and pure water is injected into another hollow portion 14 through a passage 16 at a high pressure by about 0.5-1kg/cm<2> than that for the hollow portion 13. Though the pressure water is caused to leak inside and outside of the casing 2 by rotary sliding packings 11, 12, such leakage will not lower the quality of ready-mixed concrete, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft sealing method for sealing a gap between a rotating shaft and a casing of a concrete mixer for mixing ready-mixed concrete or mortar.

Conventionally, in concrete mixers, an end face seal such as a mechanical seal is often used to seal the rotating part of the concrete mixer, and in that case, grease is used as an enclosing medium. However, there is a problem in that this grease leaks into the casing little by little during mixing of ready-mixed concrete or -E:/l/tal and mixes into the mixed ready-mixed concrete or mortar, degrading the quality of the product. Ta.

The present invention has been made in view of the above circumstances.

An object of the present invention is to provide a shaft sealing method for a concrete mixer that can maintain good quality of ready-mixed concrete and mortar as a product because grease is not used as a sealing medium.

An unknown method to achieve the above purpose.

An end face seal is provided between the rotating shaft of the concrete mixer and the casing, and water is sealed in the glllIltJ sea/l/ to seal the gap between the rotating shaft and the casing. Since the enclosing medium of the seal is water, even if a small amount of the enclosing medium leaks out, there is no risk of degrading the quality of the product.

An embodiment of the present invention will be described below.

The drawing shows a shaft sealing device for carrying out the method of the present invention, and in the drawing, 1 is a rotating shaft of a concrete mixer, and 2 is a casing. A floating end face knob 3 is interposed between these. This end face seal 3 has a rotary member 4 made of stainless steel which is externally fixed to the rotary shaft 1 and rotates together with the rotary shaft 1, and a rotary member 5 made of silicon carbide (3iC) made of nitrile. A fixing member 7 made of stainless steel, which is provided via a main QIJ ring 6 made of rubber (NB) and fitted into and fixed to the casing 2, is in contact with the rotating region body 5 and a relative m
A movable fixed carrier 8 made of silicon carbide V is disposed around a main O-ring 9 made of nitrile rubber. Also,
Rotating and sliding packings 11 and 12 made of nitrile rubber are interposed between the rotating member 4 and the casing 2, and between the sleeve 10 of the Io1 rolling shaft l and the casing 2, respectively.

These rotary and sliding gaskets 11, 12 and ii! are located between the rotating shaft l and the casing 2! T! A pair of hollow spaces m13 and 14 defined by the face seal 3 are formed.

The casing 2 has these hollow parts 13 and 14.
(In the figure, only one of the inflow side and the outflow side is shown.) Each of the above-mentioned FI paths 15.16 is provided with a flow path 15.16 for supplying fresh water to the flow path 2. Although not shown, if a pressurized water tank for cleaning a mixer drum or the like is installed, the device is connected to the water tank, and if the desired pressurized water cannot be obtained from the water tank, it is connected to a water pump or the like.

In addition, 17.18 in Figure 1 is a locking bottle, and each day i5a and ga of s Fi 1 rotation ring rotation and 5 fixed ring body 8 are grown, respectively, and S 1 rotation member 4 and rotation area body 5. Also, each relative rotation between the fixed member 7 and the fixed mounting body 80 is restricted.

Further, 19 and 20 are locking pins that lock the one-rotation member 4 and the fixed member 7, respectively, and 21 is an O-ring.

Therefore, in the method of the present invention, the desired pressurized fresh water from the pressurized water tank or water bottle 1 for cleaning is injected at a constant pressure from the flow path 15 into one of the hollow portions 13, and from the flow path 16. The injection is carried out into the other hollow part 14 so that the pressure relative to the hollow part 131C is also high by about 0.5 to IIV/d. Then, the end seal 3 is made using fresh water as an encapsulation medium.
functions and is energized by each main O-ring 6.9''
The relative sliding of the rotating region body 5 and the fixed ring body 8 that are in contact with each other, each main O-ring 6.9 and each rotary sliding packing 11, 120, the liquid seal machine, and the gap between the rotating shaft 1 and the casing 2 are easily controlled. Seal.

At this point, the fresh water is prevented from leaking into and out of the casing 2 by the one-turn sliding packings 11 and 12;
In the case of trout, it leaks little by little into the casing 2 and mixes into the ready-mixed concrete etc. that are being mixed. However, vi
Since the amount of fresh water is small, it does not degrade the quality of ready-mixed concrete, etc.

In addition, if the water content of the fresh concrete, etc. differs slightly due to the mixing of fresh water in this micro-basin, it is necessary to estimate the wrinkles of fresh water leaking slightly and add that amount of water to the main concrete, etc. for cross-conducting. No problem will occur if the additional mt is reduced in advance.

As explained above, one aspect of the present invention is to interpose an end face seal between the rotating shaft and the casing of a concrete mixer, and seal the gap between the rotating shaft and the casing by filling water in the four-sided seal. Because it is a material, it is possible to reliably prevent leakage of the main concrete, etc. to the outside, and
Even if the water sealed in the lft seal leaks into the casing, it will not degrade the quality of fresh concrete, etc.2.

[Brief explanation of drawings]

The drawing is a sectional view showing an example of an apparatus for carrying out the method of the present invention. 1... Rotating shaft, 2... Casing, 3... End seal.

Claims (1)

[Claims] In a shaft sealing method for a concrete mixer, in which an end face seal is interposed between the rotating shaft and the casing of the concrete mixer, and an enclosing medium is enclosed in the end face seal to seal the gap between the rotating shaft and the casing, the enclosing medium is A shaft sealing method for a concrete mixer characterized by using water.