JP3140509U - Fine grinding device - Google Patents

Abstract

[PROBLEMS] To cool a rotor and pulverize inside the pulverizer without major equipment change or enhancement of the entire pulverizer or manufacturing plant, without adding a dehumidifier, and without increasing energy costs. The heat generated by the operation should not cause the quality change or melting of the raw material powder.
A plurality of tubular first refrigerant passages 115 are provided in a circumferential portion of an outer surface 107f of the rotor 107 in parallel with the axis C direction of the rotor, and rotary disks 104 and 105 are provided at both ends of the rotor. Disposed, radial second refrigerant passages 113 and 114 are provided from the center in the rotating disk toward the outer periphery, and the second refrigerant passage is the first refrigerant passage and the circular pipe passages 111 and 112 at the center of the rotor. In addition, the circular pipe passages 111 and 112 are connected to an external cooling circulation device.
[Selection] Figure 1

Description

  The present invention relates to a pulverizer that performs a fine pulverization operation of a powder containing components having properties such as toner, pigment, powder paint, and thermoplastic resin that are used in an image forming apparatus, and that have a property of softening and melting.

  Cylindrical stator with crushing grooves formed on the inner surface, and cylindrical rotation with crushing grooves formed on the outer surface, arranged concentrically inside the cylindrical stator via an annular space When producing fine powder using a mechanical crusher with a rotor, the rotational speed of the rotor is increased to the limit of the mechanical device or the annular space between the rotor and the stator is increased depending on the purpose of generating fine particles. The gap is made as narrow as possible to obtain micron order particles.

  However, in reality, if the raw material powder contains a component that softens and melts, depending on the temperature generated inside the machine, the produced powder may adhere, melt, or not melt. In many cases, however, the properties of the particles are altered and the intended particle performance cannot be obtained.

For example, in the case of toner for copying machines, the required particle size of toner as a developing material is becoming smaller and smaller as the quality of printers increases, but the toner has a result to be fixed on the transfer material. Since the resin and the release material (wax content) are contained, the temperature inside the mechanical device needs to be 40 to 50 ° C. or lower.
For this reason, it is impossible to obtain fine particles by increasing the rotational speed of the rotor of the mechanical device to the limit rotational speed only by introducing outside air into the machine. It is carried out by introducing a large amount into a pulverizing operation together with raw materials.
At the same time, a cooling jacket is provided around the outer periphery (cylindrical outer box) of the mechanical device on which the stator is mounted to cool the mechanical device from the outside.

  In view of reducing environmental load, powder coatings are also being recycled 100%, and powder coatings are attracting attention from the viewpoint of reducing VOC (volatile organic compound) load. Since it depends on the glass transition point of the resin contained in the paint, there is an increasing need to lower the temperature inside the mechanical device in order to avoid alteration of the resin.

  However, if the temperature of the outside air introduced into the inside of the machine of the pulverizer is lowered to a minus temperature (for example, minus 10 to 20 ° C.) and the heat drop is increased in order to realize the above requirement, the relative humidity of the cold air in the machine becomes 100 %, The dew point is reached, and problems such as condensation of the powder particles and condensation in the machine occur. In order to avoid this problem, attempts have been made to obtain a large amount of dehumidified air (see, for example, Patent Documents 1 and 2).

JP-A-8-6290 JP-A-9-173889

  However, the method of introducing dehumidified air by the conventional method requires a large apparatus, and if the capacity of the refrigerator is increased, it is necessary to increase the capacity of the dehumidifier proportionally, and the dehumidifying function is increased. In the case of a built-in refrigerator, the design conditions are limited, so the cost is high.

  In addition, the need for a large refrigerator and dehumidifier increases the power consumption, and it is a facility that goes against the recent direction of energy reduction.

  Further, a means for supplying refrigerant to the inner and outer surfaces of the pulverizer and sequentially performing coarse pulverization to fine pulverization is disclosed in, for example, Patent Documents 3 and 4, but a rotor that rotates at high speed or the like. Although the concept of circulating the refrigerant to lower the surface temperature of the stator is disclosed, no specific possible mechanism is described.

JP 2007-187689 A JP 2007-178718 A

  Conventionally, a cylindrical stator having a crushing groove formed on the inner surface, and concentrically arranged via an annular crushing space inside the cylindrical stator, and a crushing groove is formed on the outer surface thereof In a fine pulverizer equipped with a cylindrical rotor: When the rotational speed is not relatively high, a passage is provided on the shaft side of the rotor, and a refrigerant is circulated in the rotor internal space so that the temperature of the rotor itself can be increased. Lowering and taking away the heat generated by the pulverization operation is also performed as a more effective means (see, for example, JP-A-2004-42029).

  However, when the number of rotations increases, the refrigerant circulated in the rotor internal space is a liquid having a specific gravity compared to air. Therefore, when high-speed rotation is required to obtain the intended particle size of the powder, Under the influence of centrifugal force, a large uncertain unbalance (unbalanced weight) is generated, and in reality, the machine cannot be rotated at a high speed, and as a result, the machine cannot exhibit its performance.

  In addition, even if the coolant is circulated in the internal space of the rotor and the temperature is lowered, structural members such as steel that constitute the rotor cannot withstand centrifugal force unless they have a certain thickness. The cooling effect of the pulverizer that takes time to move from the outer peripheral surface of the rotor to the refrigerant in the rotor inner space is limited, and the pulverizer that instantaneously pulverizes is limited.

The purpose of the present invention is to directly apply the raw material inside the fine pulverizer to the raw material with the characteristic that the properties of the powder change due to heat, without major equipment change or enhancement of the entire pulverizer and manufacturing plant. It is to provide a method for solving the problems of the background art by directly cooling the stator and the rotor which are brought into contact with each other and pulverized.
Another object of the present invention is to directly cool the stator and rotor of the pulverizer by directly cooling the heat generated by the pulverization operation inside the pulverizer without adding a dehumidifying device and increasing the energy cost. Provide a means to solve the problem.

  In this device, a cylindrical stator having a grinding groove formed on the inner surface, and a concentric arrangement inside the cylindrical stator via an annular grinding space, and a grinding groove formed on the outer surface thereof. A pulverizing apparatus comprising: a plurality of circular first refrigerant passages provided in parallel to an axial direction of the rotor on a circumferential portion of the outer surface of the rotor; Rotating disks are disposed at both ends of the rotor, and a radial second refrigerant passage is provided from the central portion to the outer peripheral portion of the rotating disk, and the radial second refrigerant passage is a circumferential portion of the outer surface of the rotor. The cylindrical first refrigerant passage and the circular pipe passage at the center of the rotor are connected to each other, and the circular pipe passages at both ends of the rotor center are connected to an external cooling / circulating device.

  In this device, a cylindrical stator having a grinding groove formed on the inner surface, and a concentric arrangement inside the cylindrical stator via an annular grinding space, and a grinding groove formed on the outer surface thereof. A third refrigeration passage in which a cooling refrigerant circulates between an outer peripheral portion of the stator and a cylindrical outer box on which the stator is fixedly mounted. At the same time, a plurality of tubular first refrigerant passages are provided on the outer circumferential surface of the rotor in parallel to the axial direction of the rotor, and rotating disks are disposed at both ends of the rotor. , A radial second refrigerant passage is provided from the center to the outer periphery of the rotating disk, and the radial second refrigerant passage is formed in a tubular first refrigerant passage on the outer circumferential surface of the rotor; The circular pipe passage at the one end of the rotor center is communicated with the circular pipe passage at the center of the rotor. Characterized by connecting to the ring system.

  The circular pipe passage of the present invention is connected to the external cooling circulation device via the refrigerant circulation passage, and the refrigerant flowing through the refrigerant circulation passage is supplied from one side of the rotating shaft, and the other It is discharged from the side.

  Since this device is configured as described above, it is not necessary to newly install a dehumidifying device in the refrigerator, and the cooling effect of the fine pulverizing device having a rotor rotating at high speed can be dramatically increased without increasing the energy cost. Can be increased. Even pulverized raw materials such as toners, pigments, powder paints, and thermoplastic resins used in image forming apparatuses can be prevented from being altered or softened and melted by pulverization heat. It can be performed.

A cylindrical stator having a grinding groove formed on the inner surface, and a cylindrical stator that is concentrically disposed inside the cylindrical stator via an annular grinding space and has a grinding groove formed on the outer surface thereof In a pulverizing apparatus comprising a rotor, a rotor rotating at a peripheral speed of 100 to 160 m / sec generates a large centrifugal force represented by the following equation.
{(R * N ² ) /8.93×10 ⁵ } g
r is the radius of the rotor (mm) N is the number of rotations of the rotor (1 / min)

  When liquid refrigerant or chiller water is circulated in the space inside the rotor, a large centrifugal force is applied to the refrigerant itself, and the refrigerant is a fluid liquid. As a result, a large imbalance occurs, and a large vibration or noise occurs in the rotor, making it impossible to continuously operate.

  In addition, after the heat generated in the pulverization region of the annular space formed by the outer periphery of the rotor and the stator is deprived of heat by the refrigerant on the rotor side, the refrigerant is continuously moved to In order to exchange heat and return to the external cooling device from the central tubular passage, this liquid refrigerant is uniformly moved at a pressure equal to or higher than the centrifugal force, which is calculated from the above equation, depending on the radial position. There is a need.

  In order to solve this problem, by providing as many small tubular passages as possible near the outer peripheral surface of the rotor, the weight of the refrigerant flowing in one circular pipe is slightly smaller than that of the rotor. At the same time, it is possible to move in one direction from one direction to the other without being affected by centrifugal force and without flowing to an indefinite position.

Further, in the process of moving in the pipe line, by making the pipe flow velocity in the tubular passage of the rotor turbulent, large heat exchange can be performed with a small amount of refrigerant.
This is a knowledge known from the heat transfer theory of turbulent heat transfer, but in order to adapt this to reality, the flow velocity should be increased with a small flow rate without increasing the cross-sectional area of this single pipe. Can be realized.

  In order to take a large amount of heat from the outer surface of the rotor and lower the temperature of the powder particles on the outer surface, the pipe is provided as described above, and at the same time, the pipe is made to the extent allowed by the work and strength of the rotor. Effective heat transfer can be achieved by increasing the number of paths.

Since the rotor that rotates at high speed is affected by the weight due to the above centrifugal force, the rotor itself can be rotated at a high speed by reducing the weight of the rotor as long as it does not impair the mechanical strength.
Therefore, the rotor itself is also required to take a technique that makes it as hollow as possible, except for the portions constituting the grinding grooves on the outer peripheral surface.

  Therefore, in order to supply the refrigerant to a large number of conduits provided under the outer surface of the rotor rotating at high speed, a disk having a certain thickness is attached to both left and right end faces of the rotor, and centrifugal force is applied to the disk. It is necessary to provide the same radial passage that is not affected by the above-mentioned, and to communicate the circular pipe passage in the rotor central shaft portion and the plurality of tubular passages in the outer peripheral portion of the rotor to transfer the refrigerant.

The circular pipe passage at the center of the rotor is connected to a cooling device having an external heat exchanger via a rotary joint, and the refrigerant supplied from one end of the rotor is centered on the radial passages in the disks at both ends. Move from one side to the other, move a number of circular pipe passages below the outer circumference of the rotor from one to the other in parallel in the axial direction, and move the radial passage in the disk at one end from the outer circumference to the axis center Then, it reaches an external cooling device via another rotary joint communicating with the central portion of the shaft.
In the external cooling device, the refrigerant whose temperature has risen is cooled again to a predetermined temperature and repeatedly circulated in the rotor by the pump.

An embodiment of the present invention will be described with reference to FIGS.
Rotating disks 105, 106 and a rotation unit, which are on the center line C of the cylindrical outer box 117 of the pulverizing apparatus 1 in FIG. 1 and are integrated with the rotating shafts 103, 104 supported by the bearings 101 102 at both ends. The child 107 is rotated at high speed by an electric motor (not shown) through a pulley 108 at the shaft end.

  The refrigerant passes through the circular pipe passages 111 and 112 at the center of the rotation shaft via rotary joints 109 and 110 at one end of the rotation shafts 103 and 104.

  The refrigerant a supplied from the rotary joint 110 at one end of the rotating shaft 104 passes through one central circular pipe passage 112, and is then dispersed into a plurality of radial second refrigerant passages 114 in the rotating disk 106. The first refrigerant passage 115 is formed in a plurality of circular pipes that pass under the outer peripheral surface of the rotor 107 and are arranged in parallel to the axial (center line C) direction.

  Since the rotor 107 receives a large centrifugal force, the thickness of the outer diameter and the inner diameter can withstand high-speed rotation, and the necessary strength cannot be obtained if it is too thick or too thin. There is a need. The size of the cylindrical first coolant passage 115 in the rotor 107 is advantageous in terms of strength by increasing the number to maintain the strength of the rotor 107 and by making the cross-sectional area (diameter) relatively small. At the same time, it is advantageous in terms of heat transfer efficiency.

  The refrigerant a flowing in one direction through the circular tubular first refrigerant passage 115 of the rotor 107 enters the radial second refrigerant passage 113 provided in the rotary disk 105 at the other end, and from the outer peripheral side of the radial passage. It flows toward the rotating shaft 103, enters the circular pipe passage 111 at the center of the rotating shaft 103, and circulates from the rotary joint 109 at the end of the rotating shaft 101 toward the external cooling circulation device 13.

  On the other hand, stators 116a and 116b arranged concentrically with the rotor 107 are fixed to a cylindrical outer box 117. The inner surfaces 116f of the stators 116a and 116b and the outer surface 107f of the rotor 107 are crushed grooves. (Not shown) is formed.

  A third refrigerant passage 118a 118b is circumferentially provided on the inner surface of the cylindrical outer box 117 to which the stator 116 is attached. Like the rotor 107, the refrigerant a is circulated from the external cooling circulation device 13. By cooling the outer peripheral surface of the stator 116 and taking away the heat of grinding, the cooling effect of the rotor 107 and the effect of suppressing the temperature rise of the ground product are exhibited.

The operation of this embodiment will be described with reference to the flowchart of FIG.
The raw material supply side of the pulverizer 1 is equipped with an air filter 2 and an air cooling device 3 in the air introduction section. In this air cooling device 3, when the water is cooled to a minus temperature, the condensed moisture is solidified, so that it becomes a complicated device that melts it. In this system, the cooling effect of the pulverizing device 1 itself is obtained. Since it is high, it is usually only necessary to provide a refrigerator system 4 that creates a dry air having a temperature of plus 1 to 5 ° C. that does not dew.

  The raw material powder is sent from a screw feeder 5 with a hopper to a duct on the inlet side of the pulverizer 1 through an air shut-off valve 6 having a quantitative supply capability such as a rotary valve.

  When the raw material passes through the annular pulverization space 119 of the rotor 107 and the stator 116 in the pulverization apparatus 1, a pulverization operation is performed to obtain a fine powder product having a desired particle size.

  The raw material pulverized in the fine pulverization apparatus 1 together with the air 7 in the duct whose temperature has been sufficiently lowered passes through the duct 8 with the discharge temperature being suppressed, and in the cyclone 9, the pulverized product and a minute amount of fine pulverization are obtained. After being separated into air containing powder and entering the dust collector 10, the air from which fine powder has been removed is released to the atmosphere.

  The rotational speed of the blower 11 is controlled so that the amount of cold air passing through the fine pulverizing apparatus 1 becomes a set amount of air based on a signal from the flow meter 12.

Chiller water sufficiently cooled from the refrigerant circulation device 13 is transported by the pump 14 and enters the collecting pipe 15a, from which it is distributed to each part of the rotor 107 and the stator 116.
In addition, the refrigerant that has deprived heat from the pulverizer 1 reaches another collecting pipe 15b and returns to the refrigerant circulation unit 13, where the deprived heat is released to the outside, cooled down, and circulated again. repeat.

It is a longitudinal cross-sectional view which shows the Example of this invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 1. It is a crushing system flowchart of the crushing device of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine grinding apparatus 2 Air filter 3 Air cooling apparatus 4 Refrigerator system 5 Screw feeder 6 Air shut-off valve 7 Air flow 8 Duct 9 Cyclone 10 Dust collector 11 Blower 12 Flow meter 13 Refrigerating machine 14 Pump 15a, 15b Collecting pipe 101 Bearing 102 Bearing 103 Rotating shaft 104 Rotating shaft 105 Rotating disc 106 Rotating disc 107 Rotor 108 Pulley 109 Rotary joint 110 Rotary joint 111 Circular pipe passage 112 Circular pipe passage 113 Radial second refrigerant passage 114 Radial second refrigerant passage 115 Circular tubular First refrigerant passage 116a Stator 116b Stator 117 Cylindrical outer box 118a Third refrigerant passage 118b Third refrigerant passage 119 Annular circulation space 120 Rotor fixing bolt

Claims (3)

A cylindrical stator having a grinding groove formed on the inner surface, and a cylindrical stator that is concentrically disposed inside the cylindrical stator via an annular grinding space and has a grinding groove formed on the outer surface thereof In a pulverizer comprising a rotor:
A plurality of tubular first refrigerant passages are provided on the outer surface circumferential portion of the rotor in parallel to the axial direction of the rotor, and rotary disks are disposed at both ends of the rotor. A radial second refrigerant passage is provided from the central portion toward the outer peripheral portion, and the radial second refrigerant passage is formed in a cylindrical first refrigerant passage on the outer circumferential surface of the rotor, and on the center of the rotor. A fine pulverizing apparatus characterized in that it communicates with a circular pipe passage, and further, the circular pipe passages on both sides of one end of the rotor center are connected to an external cooling circulation device. A cylindrical stator having a grinding groove formed on the inner surface, and a cylindrical stator that is concentrically disposed inside the cylindrical stator via an annular grinding space and has a grinding groove formed on the outer surface thereof In a pulverizer comprising a rotor:
A third coolant passage is provided between the outer periphery of the stator and a cylindrical outer box to which the stator is fixedly mounted so that a cooling refrigerant circulates. A plurality of tubular first refrigerant passages are provided in parallel to the axial direction of the rotor, rotary disks are disposed at both ends of the rotor, and radial from the center to the outer periphery of the rotary disk. The second refrigerant passage is communicated with a tubular first refrigerant passage on the outer circumferential surface of the rotor and a circular pipe passage at the center of the rotor, and the rotation is further performed. A fine pulverizer characterized in that the circular pipe passages on both sides of one end of the child center are connected to an external cooling and circulation device.   The circular pipe passage is connected to the external cooling circulation device via a refrigerant circulation passage, and the refrigerant flowing through the refrigerant circulation passage is supplied from one side of the rotating shaft and discharged from the other side. The pulverizing apparatus according to claim 1 or 2, wherein

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