JP3674449B2 - Continuous dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous dryer in which a hollow rotary screw shaft is provided in a casing, and a raw material is transferred in a certain direction by the rotation of the screw shaft and a treatment such as drying is performed.
[0002]
[Prior art]
Two hollow screw shafts having spiral blades are provided in parallel in a casing provided with a jacket, and the screw shaft is rotated while circulating a heat medium between the hollow portion of the screw shaft and the jacket, A continuous dryer for transferring and drying the raw material supplied in the casing is known (see, for example, JP-A-6-23253). Crystallization of liquid material, dry pulverization, resin desolvation, inorganic slurry It is widely used for drying, cooling of highly viscous raw materials, kneading and drying of two-component materials, reaction of organic substances, and the like.
[0003]
[Problems to be solved by the invention]
Since the conventional continuous dryer of this type has a structure in which the body B provided with the jacket J is supported by the plate-like support legs S provided on the lower surface side of the body as shown in FIG. When the heat medium is circulated, the support legs are heated and thermally expanded, and the body is lifted in a direction perpendicular to the axial direction (in the case of cooling, the downward force is received by the contraction of the support legs), and the shaft of the drive unit such as a motor There is a problem that a core misalignment occurs between the screw shaft and the screw shaft and smooth rotation cannot be achieved, and the misalignment causes the screw and the inner surface of the casing to contact each other and cause abnormal wear. On the other hand, even if it tries to solve the above problems by adjusting between connecting parts such as couplings, it is a structure in which the two screw shafts rotate close to each other. It was extremely difficult and could not be solved by this method. Then, this invention makes it the subject to improve the support method of a fuselage and to reduce the influence of thermal expansion.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following configuration. That is, the continuous drying apparatus according to the present invention inserts a hollow screw shaft into the body provided with a jacket outside the casing, and passes the heat medium through the hollow portion of the screw shaft and the jacket. the in is rotated continuously dryer that performs transport and drying raw material fed into the casing, provided with a flange cross-sectional area of the overhang and the tip portion is formed to be smaller in the left and right sides from the body, the It is characterized in that it is supported on a gantry by fixing the tip portions of the left and right flanges to the tops of vertical support legs provided on the respective sides .
[0005]
In this continuous drying apparatus, the body is supported by a support leg through the tip of the small cross-sectional area of the flange projecting to the left and right sides thereof, so that heat conduction to the support leg is small and thermal expansion is small. Problems such as misalignment are less likely to occur. In addition, by providing flanges symmetrically on both the left and right sides of the fuselage, forces that cancel each other are generated even if thermal expansion occurs in the lateral direction of the flanges, thereby preventing displacement of the fuselage.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described more specifically based on the embodiments of the present invention shown in the drawings.
[0007]
1 to 6 exemplify a continuous dryer according to the present invention. In this continuous dryer 1, two screw shafts 5 and 5 are provided in parallel inside a casing 3 of a body 2, The front end portion and the rear end portion are rotatably supported by bearings 4 and 4, respectively. The screw shaft 5 is provided with a hollow screw blade (paddle) 5b spirally provided on the outer peripheral portion of the hollow shaft 5a, and rotates in the opposite direction while the screw blades of the two screw shafts facing each other mesh with each other.
[0008]
A rotary joint 8 is provided at the end of the screw shaft 5, and the heat medium inlet 6 and the outlet 7 are connected to each other via the rotary joint. The heat medium flowing in from the inflow port 6 flows through the hollow shaft 5a and the hollow screw blade 5b communicating with the hollow portion of the hollow shaft, and flows out from the outflow port 7.
[0009]
A heat medium jacket 10 is provided outside the casing 3. The jacket 10 is also provided with a heat medium inlet 11 and an outlet 12, and the casing is heated (or cooled) while the heat medium flowing in from the inlet 11 flows out of the outlet 12. A raw material supply port 14 is provided at the rear end portion of the casing 3, and a raw material take-out port 15 is provided at the front end portion. In addition, degassing ports 16 and 16 for exhausting moisture and the like inside the casing, and inspection ports 17 and 17 with a lid for observing the inside are provided in the middle part of the casing.
[0010]
A motor 20 with a reduction gear and a gear box 22 are provided at the rear part of the body 2, and the rotational power of the motor 20 is transmitted to the two screw shafts 5 and 5 through the gear train of the gear box 22. Reference numerals 23 and 23 denote spline shaft couplings that connect the output shaft of the gear box and the screw shaft, and reference numeral 24 denotes a chain coupling that connects the output shaft of the motor 20 and the input shaft of the gear box.
[0011]
The body 2, the gear box 22, the motor 20, and the like are supported by support frames 33, 34, and 35 on a base 32 provided on the upper surface of the gantry 30. The support frame 33 that supports the body 2 is formed in a box shape by front, rear, left and right plate-shaped support legs 40, 40, 41, 41. These plate-shaped support legs are provided with substantially V-shaped notches 42,... Extending from the upper end to the vicinity of the bottom, and the area of the support legs is reduced by that amount, and heat dissipation in the support frame 33 is efficient. It is often done.
[0012]
Front and rear flanges 50, 50 that project to the left and right sides are integrally provided on the outer periphery of the body 2. Horizontal mounting plates 51, 51 are integrally provided at the left and right end portions of the flange 50, respectively. On the horizontal receiving plates 53, 53 provided at the upper ends of the corner portions of the support legs 40, 41 of the support frame 33. Are fixed with bolts. Similarly, the front end portion of the rear flange 50 is fixed on the support leg, and the body 2 is supported by the front and rear flanges 50 and 50 at four points.
[0013]
On the other hand, the support frame 34 that supports the gear box 22 is plate-shaped, and the support frame 35 that supports the motor 20 is a combination of channel steel and steel plate. The support frames such as the gear box 22 and the motor 20 are not heated to such a high temperature, and may have other shapes and structures as long as they can be supported firmly. It is also possible to attach casters 53,... And adjuster-equipped fixing legs 54,... To the lower portions of the four columns of the gantry 30 so that they are convenient for movement and installation.
[0014]
In order to process the raw material using the continuous drying apparatus 1, the screw shaft is rotated while circulating a heat medium (for example, high-temperature heat medium oil) through the screw shaft 5 and the jacket 10, and the raw material is supplied to the raw material inlet 14. To the casing 3. This raw material is stirred while being transferred to the outlet side by the screw blade 5b, and is heated and dried during the transfer. The dried raw material is gradually discharged from the raw material outlet 15. During this time, the gas generated in the casing 3 is exhausted from the deaeration port 16. If necessary, the exhaust port 16 can be evacuated to facilitate exhaustion.
[0015]
When the heating medium is circulated by the continuous dryer 1, the body 2 is heated by the high-temperature heating medium, so that the support legs 40 and 41 are also heated by the heat conducted through the flange 50. However, in the apparatus of the illustrated example, heat is transferred to the support leg through the tip of the small cross-sectional area of the flange 50 projecting sideways, and there is also heat radiation by the flange, so the amount of heat conduction to the support leg is relatively small. Less. If the front end of the flange is fixed to the support leg with a plate-shaped heat insulating material interposed therebetween, the amount of heat transfer can be further reduced.
[0016]
【The invention's effect】
As apparent from the above description, a continuous dryer according to the present invention includes a body to be heated and cooled during operation, support legs in through the front end portion of the small cross-sectional area of the flange overhanging the left and right sides Since it is supported, heat conduction to the support leg can be kept low, and it is possible to effectively prevent misalignment of the shaft core due to thermal expansion or the like. In addition, there is an advantage that the body is cooled by heat radiation by the flange. It goes without saying that this continuous dryer can be used effectively for processes other than drying, such as mixing of raw materials, reaction, and cooling.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a continuous dryer according to the present invention.
FIG. 2 is a side view of a continuous dryer.
FIG. 3 is a plan view of a continuous dryer.
FIG. 4 is a front view of a continuous dryer.
FIG. 5 is a side view of a screw shaft.
FIG. 6 is a sectional view of a screw shaft.
FIG. 7 is a front view of a main part of a conventional continuous dryer of the same type.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Continuous dryer 2 Body 3 Casing 5 Screw shaft 10 Flange 20 Motor 22 Gear box 33 Support frame 40, 41 Support leg

Claims (2)

A hollow screw shaft is inserted into the inside of a body provided with a jacket outside the casing, and the raw material supplied into the casing is rotated by rotating the screw shaft while circulating a heat medium through the hollow portion of the screw shaft and the jacket. and in a continuous dryer for drying, the flange cross-sectional area of the overhang and the tip portion is formed to be smaller in the left and right sides from the body is provided, arranged left and right of the flange of the distal end portion on each side A continuous dryer characterized in that it is supported on a frame by being fixed to the top of a vertical support leg.   The continuous dryer according to claim 1, wherein the front end of the flange is fixed to the top of the support leg via a heat insulating material.

Images