JPS61245853A - Closed circuit type crusher - 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 [Field of Industrial Application] The present invention relates to a grinding system, ie, a closed-circuit grinding device comprising a ball mill, a classification cyclone, a back filter device, a blower device, etc.

[Prior Art] Ball mills as devices for pulverizing samples are well known in the art, needless to mention the literature, and classification cyclones, filter devices, and even blower devices are also well known in the past. . These devices can therefore also be used to grind samples, classify them, and recover products.

However, when attempting to obtain ultrafine powder such as zirconia, the above-mentioned conventional apparatus has a problem. In other words, powders generally tend to aggregate when they become ultra-fine.
In particular, when moisture (for example, water vapor in the air) is mixed in, aggregation is promoted, and when agglomeration occurs, the nuclei gradually grow and aggregate, making grinding and classification difficult.

Therefore, it becomes virtually impossible to obtain powder with a particle diameter of 3μ or less. Another problem is that conventional equipment cannot perform continuous automatic operations such as crushing and classification.

In order to solve this problem, the applicant filed a patent application in
No. 641, a ball mill adapted to crush the sample while it is fed and discharged;
A cyclone for classifying the sample crushed by the ball mill, a back filter device for collecting the product classified by the cough classification cyclone, and a back filter device for supplying the coarse particles classified by the classification cyclone to the ball mill. It consists of a classification hopper device and a blower device for force-feeding the sample crushed by the ball mill to the classification cyclone, and the discharge port of the blower device and the supply port of the classification cyclone are connected with an injection nozzle. The outlet of the classification cyclone and the back filter device are airtightly connected by a product pipe, and the exhaust port of the back filter and the inlet of the blower device are connected by a return pipe. The discharge pipe of the ball mill opens to the injection nozzle, the classification hopper device is hermetically connected to the discharge port of the classification cyclone and the supply port of the ball mill, and the classification hopper device The device consists of multiple stages of hoppers, and these hoppers are equipped with ball valves and can be operated at equal pressure by high pressure supplied from an equal pressure pipe connected to a high pressure pipe.
11 closed circuit type crushing equipment is provided.

However, in this device, there is a problem that the powder and air separate after the injection nozzle part of the high-pressure tube, and the powder adheres and aggregates inside the high-pressure tube.Also, the isobaric device of the classification hopper device has a Operation is complicated.

[Object of the Invention] Accordingly, an object of the present invention is to provide a dense mw single-circuit crushing device that prevents adhesion and agglomeration of powder in a mixing tube and simplifies the structure and operation of the classification hopper device.

[Structure of the Invention] The closed-circuit crushing device according to the present invention includes a ball mill in which a sample is crushed while the sample is supplied and discharged, and a sample crushed by the ball mill is classified. a cyclone, a back filter device that collects the products classified by the classification cyclone, a classification hopper device configured to supply the coarse particles classified by the classification cyclone to the ball mill, and a product crushed by the ball mill. and a blower device for force-feeding the sample to the classification cyclone, and the discharge port of the blower device and the supply port of the classification cyclone are airtightly connected by a high-pressure pipe having an injection nozzle interposed therein. , the outlet of the classification cyclone and the back filter device are hermetically connected by a product pipe, the exhaust port of the back filter and the suction port of the blower device are hermetically connected by a return pipe, and The discharge pipe opens to the injection nozzle, the classification hopper device is airtightly connected to the discharge port of the classification cyclone and the supply port of the ball mill, and the 'B pressure pipe is connected to the discharge pipe of the ball mill. A mixing pipe and an injection nozzle portion each having a bent part bent at an obtuse angle and a straight part having a diameter of six times or more the diameter of the pipe, an appropriate number of bent parts at an obtuse angle, and a straight part continuous to the bent part are formed. .

[Operation of the Invention] Therefore, when a sample is put into the ball mill, the mill is operated, and the blower device is started, the powder pulverized by the ball mill is sucked together with air into the injection nozzle and reaches the classification cyclone. The fine powder, that is, the product classified by the classification cyclone, reaches the back filter device through the product pipe and is collected there. The air or inert gas from which the product is recovered in the back filter device is sucked into the blower device and reused for pumping and classifying the powder. On the other hand, coarse particles classified by the classification cyclone are temporarily stored in a classification hopper device and then supplied to a ball mill. Thus, the gas for conveyance and classification is carried out by a blower device,
It circulates to the blower device through a high pressure pipe, a classification cyclone, a back filter device, a return pipe, etc., and the pulverized material or product is collected by the back filter device, and coarse particles are collected by a ball mill, a classification cyclone, a classification hopper device, etc. It will be circulated with a ball mill. During circulation, the sharp bend in the mixing tube causes the centrifugal force to be expressed as the velocity itself: V2/R÷radius of curvature.Increasing centrifugal force promotes separation of powder and air, causing agglomeration. Polygonalization of obtuse angles causes deterioration of centrifugal force due to increase in curvature, and straight sections promote mixing of air and powder, thereby preventing powder from adhering to the high pressure pipe and agglomerating. Can be done. In addition, by operating the upper and lower ball valves, it is easy to input raw materials and feed coarse particles classified by the classification cyclone to the ball mill.
As a result, the structure and operation of the classification hopper device can be simplified.

[Preferred Embodiment 11i] When implementing the present invention, it is preferable that the bent portion of the high-pressure pipe be formed at 120 degrees to 150 degrees. In this way,
Separation of particles and air can be prevented by reducing the large centrifugal force that is applied to the mixed flow of powder and air. In addition, the ball mill is an electromagnetic ball mill (patent application filed in 1983) proposed by the present applicant.
31850, Japanese Patent Application No. 58-31851). A conventionally known classification cyclone can be applied, but a hopper having a ball valve or a rotary valve below can be applied to the classification hopper device.

The back filter device is implemented as a box body for reducing the flight speed of the product to allow it to fall naturally, and a back filter box connected to the box body, and the blower device is implemented as a roots blower.

[Example 1 An embodiment of the present invention will be described below with reference to the accompanying drawings.

Now, referring to the drawings, the crushing device M embodying the present invention includes a ball mill 1, a classification cyclone 20, a back filter device 30, a roots blower 40, a classification hopper device @50, and these devices are airtightly connected. Connecting line or piping A, 81C.

It is roughly composed of D, E, etc.

A ball mill, that is, an electromagnetic ball mill 1, consists of a ball mill 2.2... and a hollow cylindrical body 3 in which a sample is housed and rotated.The cylindrical body 3 is supported by a hollow shaft 4.4. 4.4 is a pair of ball bearings 5.5
It is supported by a shaft.

One end of the hollow shaft 4.4 opens into the cylindrical body 3, and inside thereof, a supply pipe 7 and a discharge pipe 8 are respectively fixed to a classification hopper device 50 and a high-pressure pipe B, which will be described later, via bearings 6 to 6. It is contained. Therefore, even when the cylinder body 3 is driven to rotate, the sample is supplied into the cylinder body 3 through the supply pipe 7, and the pulverized sample is discharged or supplied to the mixing pipe 8 through the discharge pipe 8. I can do it. The electromagnetic ball mill 1 is described in detail in Japanese Patent Application No. 58-31850 and Japanese Patent Application No. 58-31851, and since its structure is not directly related to the gist of the present invention, it will be briefly described. Electromagnets 11.11 are provided outside the cylindrical body 3 and are activated by supplying power from the non-contact relay 10, and during operation, these electromagnets 11.11 lift the balls 2.2 to the appropriate position, and release, thus increasing the grinding efficiency. In addition, 12 is a supply pipe 7 and a discharge pipe 8.
This is a fixed scraper fixed to the

The roots blower 40 is a pump having a discharge pressure of about 0.4 Ky/alG, and a reserve tank 41 and an injection nozzle 42 are interposed in its discharge line, that is, the pressure pipe B. The mixing tube B has a gas velocity of approximately 20 m/s.
It is set to enter classification cyclone 20 with EC. The injection nozzle 42 has a known ejector section in which the pressure drops. The discharge pipe 8 of the ball mill 1 is located at the part where the pressure of this injection nozzle drops.
The tip is open. The interior of the ball mill 1 is connected to the inlet D, and pressurized air is communicated to the supply pipe 7 to be pressurized. Therefore, when the high-pressure gas flows through the injection nozzle portion N, the sample is sucked and pumped from the ball mill 1 and then supplied to the classification cyclone 20. This branch line D is provided with a regulating valve (2). In order to increase the suction force of the nozzle part N, at least 0
Since high-pressure gas of 'J/aiG ~0.6#/mG is required for ゜3, the pressure should be higher than the pressure inside the ball mill 1 (
230s■11G).

The injection nozzle part N of the high-pressure pipe B has a first bent part 811 bent at an obtuse angle, for example, 120 degrees to 150 degrees, preferably 135 degrees, with respect to the discharge pipe 8, and a length of at least 6 times the inner diameter of the mixing pipe. A first linear part 821 is formed between the injection nozzle part N and the classification cyclone 20.
and a third bent portion 31 preferably bent at 135 degrees.
2.813 and second and third straight portions B22.823 continuous thereto are formed. The classification cyclone 20 has a plurality of (two in the illustrated example) first cyclones 21 and second cyclones 22 arranged in series, and the second cyclone 22 is connected to a high-pressure pipe through a branch pipe E. In response to the supply of high-pressure secondary air, the flow velocity that has decreased due to the resistance of the first cyclone 21 is accelerated. This first cyclone 21 is conventionally known, but by providing the second cyclone 22,
Submicron powder of a medium size, for example, 0.5 to 0.6 μM, is sent to a bag filter device 30 through a product tube C, and is discharged to a coarse particle classification hopper device 50.

Intermediate particles, for example 0.85 μM particles, are collected in the hopper of the second cyclone 22. Bag filter assembly M30
In order to reduce the flight distance of the product, there is a box 31 whose diameter is extremely large compared to the inner diameter of the product tube C, and a box 3 that is pneumatically connected above the box 31.
2 and the filter 33 attached to the box 32. A lid body (not shown) is freely provided on the box body 31 via a gasket, and a lid body is also provided on the box 32, so that the product inside can be collected or the filter 33 can be replaced. It has become. In this way, the diameter of the box body 31 is sufficiently large, so
Although the product is a fine powder, it is deposited by gravity inside the box. Therefore, less product reaches the filter 32 and there is less chance of clogging the filter. Also, as shown, the filter 32 is open at the bottom and the bottom or filter section 34 is at the top.
The chance of clogging is also reduced by this arrangement.

A return pipe A extends from the bottom of the box 32 of the bag filter device 30, and this return pipe A is connected to the Roots blower 4.
It is pneumatically coupled to the suction port 43 of 0. Therefore, roots blower 40, pressure tube B1 classification cyclone 20,
Product pipe C1 bag filter device 301 return pipe A constitutes a pneumatically closed circuit.

Although the closed circuit is airtight, the amount of gas in the circuit increases and decreases during operation. Therefore, some kind of countermeasure is required. In this embodiment, a breather pulp 44 is provided in the return pipe A for this purpose. The breather pulp 44 releases and replenishes the gas in the return pipe A, and operates at, for example, ±25 aq with respect to the pressure during normal operation.

The breather pulp 44 is connected by a pipe 49 via a filter 47 to prevent foreign matter from entering a drying box 45 containing a desiccant 46, and the gas, that is, air, is supplied to the return pipe A using dry clean air. is being supplied.

Classification hopper equipment! 50 supplies the coarse particles classified by the classification cyclone 20 to the ball mill 1, and is configured as follows. That is, the hopper equipment ff150 consists of a first hopper 51 located above and a second hopper 52 located below.

The first hopper 51 is formed integrally with the lower part of the second cyclone 21, and the second hopper 52 is connected to a cylindrical part 53 that receives coarse particles and whose diameter gradually decreases downward. The conical portion constitutes a discharge end, and a rotary breaker 55 for preventing powder clogging is provided near this conical portion. Each hopper 51, 52 is provided with upper and lower rotary valves 56a and 56b having dimensions and rotational speed matching the discharge amount, and between these rotary valves, that is, an upper classification cyclone 2.
A raw material input hopper 58 is provided via a screw feeder 57 in a part, for example, the cylindrical part 53, where the influence of pressure from zero is weakened and also protected from pressure from the lower rotary breaker 55 side. It is being The coarse particles from the second hopper 52 are supplied to the ball mill 1 through a lower rotary valve 56 and a rotary breaker 55 by a screw feeder 13 installed in the supply pipe 8. Therefore, when inputting raw materials, both rotary pulps 56a
If raw material is received into the cylindrical portion 53 while rotating the raw material 156b, it can be supplied to the rotary breaker 55 from the lower rotary valve 56b while maintaining a sufficiently low pressure (eg 17111/HQ).

Therefore, according to the present invention, the ball mill, the classification cyclone, the back filter device, the blower device, and the classification hopper device form a closed circuit, thereby preventing water vapor, foreign matter, etc. from entering the circuit. Therefore, the powder to be pulverized or the pulverized product will not be agglomerated due to moisture, nor will foreign matter be mixed into the product, thereby reducing the quality of the product. In addition, the bent portions B11, 812 and B13 of the high pressure pipe B reduce the large centrifugal force on the mixed flow of powder and air to prevent separation of the particles and air, and the straight portions B21, B22 and B23 Promotes mixing of air and particles, thereby preventing powder from adhering to the high-pressure pipes and agglomerating. Further, by operating the upper and lower rotary valves 56a and 56b, raw materials can be input and coarse particles classified by the classification cyclone 20 can be supplied to the ball mill 1. Note that the present invention is not limited to the above embodiments, and can be implemented in various forms. For example, instead of the freezer valve 44, a pressure sensor may be provided at an appropriate location in the piping, and the gas m within the system may be controlled by this sensor. Further, by providing a classification cyclone, a back filter device, etc. in parallel to one ball mill and switching these appropriately, continuous operation can be performed without any support. It is also possible to install a cooler at a suitable location in the open circuit to suppress the temperature rise in the circuit.

[Summary 1] As explained above, according to the present invention, the high-pressure pipe has a bent part bent at an obtuse angle with respect to the discharge pipe of the ball mill, and a pipe diameter of 6.
Since the pipe and the injection nozzle part have a straight part more than double the size of the straight part, and a proper number of obtuse-angled bent parts and a straight part continuous to the bent parts, the particles and air in the pressure pipe are Separation of powder is suppressed, and adhesion and aggregation of powder on the high-pressure pipe is prevented.

Furthermore, since the high pressure supply to the classification hopper device in the conventional device is eliminated, the structure and operation of the classification hopper device are simplified.

[Brief explanation of drawings]

The drawings are overall explanatory diagrams showing one embodiment of the present invention. 1... Ball mill (electromagnetic ball mill) 7... Supply pipe 8... Discharge pipe 20... Classifying cyclone 30... Back filter device f 33...
Filter 40... Vortex pump 41... Reserve tank 42... Injection nozzle 44... Pleaser valve 45... Drying box 50...
Classification hopper device 54...Conical part of hopper (discharge end) 55...Small cone 58.59...
Equal pressure pipe A... Return pipe B... High pressure pipe C.
...Product pipe D...High pressure main pipe 811.8
12.813...Bending part B21.822, B23
... Straight section C... Product pipe D... Branch pipe E... Branch pipe N... High pressure pipe nozzle section procedure correction shop May 17, 1985 Commissioner of the Patent Office Manabu Shiga 1゜ Description of the case Japanese Patent Application No. 60-86476 2゜ Title of the invention Sealed closed circuit crushing device 3, person making the amendment Relationship to the case Applicant address 2-6-5 Yaesu, Chuo-ku, Tokyo Name Name
Misaki Senpaku Kogyo Co., Ltd. Representative Akira Hirai 4, Agent 105 Address 121-13-3-5 Nishishin, Minato-ku, Tokyo Date of amendment order Voluntary amendment 7 Contents of amendment/(A) Specification No. 1 The statement of claims from line 5 on page 4 to line 7 on page 4 is amended as follows. (1) A ball mill in which the sample is pulverized while the sample is being supplied and discharged, a cyclone for classifying the sample pulverized by the ball mill, and a product classified by the classification cyclone. A back filter device for collection, a classification hopper device for supplying the coarse particles classified by the classification cyclone to the ball mill, and a processor for pumping the sample crushed by the ball mill to the classification cyclone. - a device, the discharge port of the blower device and the supply port of the classification cyclone are airtightly connected by a high pressure pipe with an interposed injection nozzle, and the outlet of the classification cyclone and the back filter device are hermetically connected by a product pipe, the exhaust port of the back filter and the suction port of the blower device are hermetically connected by a return pipe, and the discharge pipe of the ball mill opens to the injection nozzle, The hopper device is airtightly connected to the discharge port of the classification cyclone and the supply port of the ball mill, and the high-pressure pipe has a bent part bent at an obtuse angle with respect to the discharge pipe of the ball mill, and a straight part. 1. A closed-circuit crushing device comprising a pipe, an injection nozzle portion, an appropriate number of obtuse-angled bent portions, and a straight line portion continuous with the bent portions. (2) The sealed closed circuit type crushing device according to claim 1, wherein a freezer valve is interposed in the return pipe. (3) The sealed closed circuit crushing device according to claim 2, wherein the intake side of the freezer valve is connected to a drying box. (4) The classification hopper device consists of two stages of hoppers, and these hoppers are connected by two stages of upper and lower rotary valves, and these rotary valves are operated with dimensions and rotational speed that match the discharge amount. 4. The eccentric leap circuit type crushing apparatus according to claim 1, wherein a raw material inlet is provided in a portion where upper and lower pressures are cut off by a valve. (5) The hopper has a downwardly reduced diameter portion near the discharge end, and this portion is provided with a rotating breaker for preventing powder clogging. Sealed closed circuit type crushing equipment. (6) The sealed closed circuit crushing device according to claim 1, wherein a reserve tank is interposed in the high-pressure pipe, and one end of the equal-pressure pipe is open to the reserve tank. (7) The classification cyclone is provided with a plurality of cyclones arranged in series, and the branch pipe of the high-pressure pipe is connected to the cyclone whose flow velocity decreases.
Sealed closed circuit type crushing equipment as described in . (8) The sealed closed circuit type crushing device according to claim 1, wherein a high pressure pipe is connected to the supply port of the ball mill. (9) The sealed open/close circuit type according to any one of claims 1 to 8, wherein a pressure sensor is provided in the return pipe, and the pressure in the return pipe is controlled by the sensor. Grinding equipment. (10) The inlet wind speed of the classification cyclone is approximately 20 m/S
The sealed closed circuit type crushing device according to any one of claims 1 to 9, which is an eC. (B) "More than 6 times" on page 8, line 8 will be corrected to "several times." (C) From page 9, line 10 to line 11 of the same page, [velocity itself... is indicated by the radius, so] is replaced with "Since it is indicated by the square of the velocity ÷ the radius of curvature (V2/R)," ” and correct it. (D) Set [Ball Pal] in the 5th row from the bottom to 10-
I am corrected by saying “Talibar”. (E) On page 10, line 6 of the same page, "can do. Also" can be changed to "can do." In addition, the straight part is 5 of the diameter of the pipe.
More than twice as much is preferable. Also,” I am corrected. (F) [...] on page 14, line 4. In addition, when the diameter of the first cyclone becomes large due to its capacity, the centrifugal force can be reduced, so the speed can be locally increased. It is also used to sharpen classification.This first step is corrected. (G) In the same page, page 15, line 10, after "It is becoming.", insert "In addition, the effect will be even more effective by installing an electric precipitator in the space in front of the box." (H) Activates at 25 m a Q on page 16, line 4. ” operates at about r25amaQ. ] and correct it. (I) Correct the [(Example 17m/IQ) J from the 6th line to the 5th line from directly below No. 17 to [Example ±10 Aq) J. LJ) Delete [more than 6 times the pipe diameter] on page 19, line 7.

Claims (10)

[Claims] (1) A ball mill for pulverizing the sample while it is being fed and discharged, a cyclone for classifying the sample pulverized by the ball mill, and a cyclone for catching the classified product with the classification cyclone. a back filter device for collecting coarse particles, a classification hopper device for supplying the coarse particles classified by the classification cyclone to the ball mill, and a blower device for pumping the sample crushed by the ball mill to the classification cyclone. The discharge port of the blower device and the supply port of the classification cyclone are airtightly connected by a high-pressure pipe in which an injection nozzle is interposed, and the outlet of the classification cyclone and the back filter device are connected to a product pipe. The exhaust port of the back filter and the suction port of the blower device are hermetically connected by a return pipe, the discharge pipe of the ball mill opens to the injection nozzle, and the classification hopper device The high-pressure pipe is airtightly connected to the discharge port of the classification cyclone and the supply port of the ball mill, and the high-pressure pipe has a bent part that is bent at an obtuse angle with respect to the discharge pipe of the ball mill, and a straight part that is at least 6 times the diameter of the pipe. What is claimed is: 1. A sealed closed circuit type crushing device comprising a mixing tube having a jet nozzle portion, an appropriate number of obtuse bent portions, and a straight portion continuous to the bent portions. (2) The sealed closed circuit type crushing device according to claim 1, wherein a freezer valve is interposed in the return pipe. (3) The sealed closed circuit crushing device according to claim 2, wherein the intake side of the freezer valve is connected to a drying box. (4) The classification hopper device consists of two stages of hoppers, and these hoppers are connected by two stages of upper and lower rotary valves, and these rotary valves are operated with dimensions and rotational speed that match the discharge amount. The sealed closed circuit type crushing device according to any one of claims 1 to 3, wherein a raw material input port is provided in a portion where upper and lower pressures are shut off by a valve. (5) The hopper has a downwardly reduced diameter portion near the discharge end, and this portion is provided with a rotating breaker for preventing powder clogging. Closed circuit crushing equipment. (6) The sealed closed circuit crushing device according to claim 1, wherein a reserve tank is interposed in the high-pressure pipe, and one end of the equal-pressure pipe is open to the reserve tank. (7) The sealed closed circuit according to claim 1, wherein the classification cyclone is provided with a plurality of cyclones arranged in series, and a branch pipe of the high-pressure pipe is connected to the cyclone whose flow velocity decreases. Shape crushing equipment. (8) The sealed closed circuit type crushing device according to claim 1, wherein a high pressure pipe is connected to the supply port of the ball mill. (9) The sealed closed circuit type according to any one of claims 1 to 8, wherein a pressure sensor is provided in the return pipe, and the pressure in the return pipe is controlled by the sensor. Grinding equipment. (10) The sealed closed circuit type crushing device according to any one of claims 1 to 9, wherein the pressure in the high-pressure pipe is about 60 mmHG, and the inlet wind speed of the classification cyclone is about 20 m/sec.