JPH0724439U - Crusher structure - Google Patents

Abstract

(57) [Summary] [Object] To provide a structure of a crusher capable of uniformly crushing a treated material. [Composition] The crushing tank 8 has a vertical cylindrical shape and has a crushing chamber A.
Have. The stirring shaft 2 is rotatably provided at the center of the crushing tank 8. The stirring rods 4 and 5 are horizontally attached to the portion of the stirring shaft 2 located in the crushing chamber A. The outer diameter of the stirring shaft 2 is set to 30% or more of the inner diameter of the grinding tank 8. The processed material B is stirred and crushed by the rotation of the stirring bars 4 and 5. Since the difference in the radius of gyration between the roots and the tips of the stirring rods 4 and 5 is small, the difference in the peripheral speed is also small. Therefore, the crushing force in the crushing chamber A can be made uniform. Since the cooling medium was circulated outside the crushing tank 8 and also inside the stirring shaft 2,
The cooling capacity can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a crusher, and more particularly to a crusher in which a processed product put in a crushing tank is stirred and crushed to obtain a product having a predetermined particle size. is there.

[0002]

[Prior art and its problems]

 Conventionally, as this type, a stirring shaft that rotates around its axis and a stirring rod that is mounted in a state orthogonal to this stirring shaft and that integrally rotates are provided inside a vertical cylindrical grinding tank. There is generally known a crusher of a type that is provided and rotates the stirring shaft to stir the processed product together with a plurality of media with a stirring rod to crush the processed product. In the case of this type, the stirring shaft was designed considering only the strength aspect, so the outer diameter is set to about 10% of the inner diameter of the grinding tank, and it is formed with a relatively small diameter. It was often there.

In this case, since the peripheral speed of each point from the root portion to the tip portion of the stirring rod is proportional to the distance (rotation radius) from the axis of the stirring shaft, the portion of the stirring rod radially inward (root There is a difference in peripheral speed between the base portion) and the outer portion (tip portion side). That is, when the outer diameter of the stirring shaft is designed to be 10% of the inner diameter of the grinding tank, the root portion of the stirring rod may have a peripheral speed 1/10 times that of the tip portion as a remarkable example. . For this reason, there will be a large difference in the movement of the media and the processed material between the center of the grinding tank (near the surface of the stirring shaft) and the inner wall of the grinding tank.

That is, the movement of the media and the processed material is slow near the center of the crushing tank, and conversely, the medium and the processed material move actively near the inner wall of the crushing tank. For this reason, due to the gap in the movement of the media and the processed material caused by the difference in the peripheral speed of the stirring rod itself, a part where the mixing / stirring performance greatly differs occurs in the grinding tank, and as a result, the entire grinding tank As a result, the processed product could not be crushed well.

Therefore, in the above-mentioned pulverizer, the product obtained as a result of pulverization also includes particles that have not been sufficiently pulverized, resulting in a wide particle size distribution. There was a problem.

An object of the present invention is to solve the above problems and to provide a structure of a crusher capable of uniformly processing a processed material in a crush tank and improving the crushing performance. .

[0007]

[Means for solving problems]

 In order to solve the above-mentioned problems, the present invention is, as a first invention, a vertically-arranged cylindrical grinding tank, a rotatable stirring shaft vertically installed at its center, and a horizontal direction on the stirring shaft. The structure of the crusher is provided with a plurality of stirring rods which are attached to the stirring shaft and rotate integrally with the stirring shaft when the stirring shaft is formed to have a large diameter, and the stirring rod has a root portion and a tip. It has a structure that prevents a large difference in peripheral speed from occurring with the section. As a second invention including the first invention, the stirring shaft has a configuration in which the outer diameter thereof is set to 30% or more of the inner diameter of the grinding tank. In addition, as a third invention including the first invention, the stirring shaft is formed in a hollow shape, a heat medium or a refrigerant body is circulated inside the stirring shaft, and a jacket is provided outside the grinding tank. It has a configuration in which a heat medium or a refrigerant body is circulated between them.

[0008]

[Action]

 This invention adopts the above-mentioned means, so that when the agitating shaft is rotated after the processed material is put in the pulverization tank, the agitating rod agitates and mixes the processed material to pulverize it so that a product having a predetermined particle size is obtained. It has become.

Further, in this invention, the crushing process in the crushing tank can be made uniform. That is, by forming the stirring shaft to have a large diameter and preferably setting the outer diameter thereof to 30% or more of the inner diameter of the grinding tank, the difference in the radius of gyration between the root portion and the tip portion of the stirring rod becomes small, The difference in the peripheral speed of each part of the stirring rod can be reduced. Therefore, the stirring action by the rotation of the stirring rod can be uniformly applied to the processed material in the whole area of the crushing tank from the central portion to the outermost peripheral portion.

Further, by circulating the medium or the refrigerant body inside the stirring shaft and outside the pulverization tank, the heating / cooling action of the medium from the inside and the outside affects the object to be treated. The ability is improving. Therefore, it is possible to carry out the pulverization treatment while maintaining the treated product at a constant temperature, and thereby a stable product can be obtained.

[0011]

【Example】

 Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a diagram showing an embodiment of the structure of a crusher according to the present invention. That is, the structure of the crusher shown in FIG. 1 has a vertically-arranged cylindrical crushing tank 8, a rotatable stirring shaft 2 vertically arranged at the center thereof, and a plurality of stirring shafts 2 mounted on the stirring shaft 2. The stirring rods 4 and 5 are provided. At this time, the stirring shaft 2 is formed to have a relatively large diameter with its outer diameter being 30% or more of the inner diameter of the grinding tank 8.

In FIG. 1, the crushing tank 8 is formed by closing the lower end of a vertical cylindrical body whose upper and lower ends are open with a bottom portion 15, and is fixed to a frame (not shown). At the upper opening of the crushing tank 8, a lid member 10 having a hole 10a at the center is provided. The lid member 10 has a size capable of closing the upper opening of the crushing tank 8, has an inlet 25 for the processed material B, and is fixed to the crushing tank 8 with a bolt 12. By closing the lid member 10, a crushing chamber A for crushing the processed material B is formed inside the crushing tank 8. Reference numeral 26 is a lid, which is attached to the lid member 10 to open and close the input port 25.

A discharge valve 19 is provided on the bottom portion 15 of the crushing tank 8, and a discharge valve box 16 is arranged so as to surround the discharge valve 19. The discharge valve 19 is formed of a discharge port 19b and a valve body 19a. The discharge port 19b is formed in the central portion of the bottom portion 15 of the crushing tank 8 to conduct the crushing chamber A to the outside, and the screen 17 is arranged in the discharge port 19b so as to close it. . At this time, the screen 17 is fixed to the bottom portion 15 with the bolt 18. The screen 17 has a structure that allows the processed material B to pass therethrough and blocks the passage of a medium 7 which will be described later. The processed material B processed in the crushing chamber A goes to the outside through the screen 17. It is designed to be discharged.

The valve body 19a forming the other side of the discharge valve 19 has a size capable of closing the discharge port 19b and opens and closes an opening on the outer side of the discharge port 19b. It is housed in the discharge valve box 16. The discharge valve box 16 is in the form of a vertical cylinder whose upper and lower ends are open, and is fixed to the bottom portion 15 by bolts 20 with its upper opening communicating with the discharge port 19b. As a result, the discharge port 19b communicates with the lower outside via the discharge valve box 16.

A shaft 23, which is held in a freely rotatable state, penetrates the discharge valve box 16 in a horizontal direction. In the discharge valve box 16, a shaft between the shaft 23 and the valve body 19a is connected by a lever 22. Tied up. On the other hand, on the outside of the discharge valve box 16, there is provided a drive device (not shown) such as an air cylinder connected to the shaft 23, and by the drive of this drive device, the valve body 19 a is centered on the shaft 23. It is designed to rotate as. Therefore, the valve body 19a can be switched between a closed state and an open state with respect to the discharge port 19b by rotating the shaft 23.

An annular seal member 21 that can be brought into contact with and separated from the bottom portion 15 of the crushing tank 8 is provided on the peripheral portion of the valve body 19a, and when the valve is closed, the seal member 21 serves as an exhaust port 19b. The space between the valve body 19a and the valve body 19a is sealed.

Further, the stirring shaft 2 is vertically installed in the crushing tank 8 from above with its axis aligned with the axis of the crushing tank 8. At this time, the stirring shaft 2 is inserted into the hole 10a of the lid member 10 provided at the upper opening of the crushing tank 8 so that the lower end portion thereof reaches the vicinity of the bottom portion 15. As the stirring shaft 2, a hollow shaft having a large diameter and opening upward is used. It is preferable that the outer diameter of the stirring shaft 2 is designed to be 30% or more of the inner diameter of the crushing tank 8.

An annular seal member 11 slidable with the stirring shaft 2 is provided at the hole 10 a of the lid member 10. The inner peripheral portion of the sealing member 11 slides on the stirring shaft 2 to seal between the stirring shaft 2 and the lid member 10 and seal the crushing chamber A.

The upper end of the stirring shaft 2 is connected to the rotary shaft 24 via the connecting pipe 1, and they are integrated in a state where their axes are aligned with each other. The rotary shaft 24 is rotatable by driving an external drive source (not shown), and the rotation of the rotary shaft 24 causes the stirring shaft 2 to rotate about the axis of the crushing tank 8. ing.

At this time, the rotary shaft 24 has a hollow shape so as to communicate with the connecting pipe 1 and the stirring shaft 2. Further, an introduction pipe 3 for a heat medium or a refrigerant body is arranged at the center of the rotary shaft 24, the connecting pipe 1 and the stirring shaft 2, and the lower end portion thereof is opened near the inner bottom surface of the stirring shaft 2. is there. For this reason, the introduction pipe 3 communicates with an annular flow path formed between the outer surface of the introduction pipe 3 and the inner surface of the stirring shaft 2. As a result, a flow passage is formed in the stirring shaft 2, and the heat medium or the refrigerant body circulates from the introduction pipe 3 through the stirring shaft 2.

A plurality of stirring rods 4 are integrally attached to the portion of the stirring shaft 2 located in the crushing chamber A. The stirring rod 4 is radially arranged around the axis of the stirring shaft 2 in the radial direction (horizontal direction), and has a plurality of steps in the axial direction of the stirring shaft 2. At the lowermost end of the stirring shaft 2, a single stirring rod 5 is fixed to the stirring shaft 2 with a bolt 6. Then, the stirring rods 4 and 5 are integrally rotated in the horizontal direction around the axis of the stirring shaft 2 by the rotation of the stirring shaft 2. In particular, the stirring rod 5 is adapted to stir the processed material B existing at the bottom of the crushing chamber A from the center.

A jacket 9 is provided so as to cover the outer surface of the crushing tank 8 at a predetermined interval, thereby forming a flow path between the crushing tank 8 and the jacket 9. I have to. The jacket 9 is provided with an inlet 13 for introducing a heat medium or a refrigerant body into a flow passage formed between the jacket 9 and the crushing tank 8, and the introduced heat medium or the refrigerant body is discharged. The discharge port 14 is formed.

Further, 7 is a medium, which is formed in such a size that it cannot pass through the screen 17 and is accommodated in the crushing chamber A of the crushing tank 8 in plural numbers. By rotating the stirring rods 4 and 5, the processed material B located in the crushing chamber A is stirred together with the medium 7 so that the processed material B can be efficiently crushed.

Next, the operation of the above will be described. This crusher is configured as described above, and when the stirring shaft 2 is rotated, the stirring rods 4 and 5 stir the processed material B together with the medium 7 in the crushing chamber A, whereby the processed material B is crushed. Is supposed to do.

In the normal state, the valve body 19a is in a state in which the discharge port 19b is closed. First, a required amount of the processed material B is charged through the charging port 25 of the lid member 10, and the processed material B is positioned in the crushing chamber A of the crushing tank 8. Then, the stirring shaft 2 is rotated integrally with the stirring rods 4 and 5 by driving an external drive source (not shown) to rotate the rotating shaft 24.

Then, the processed material B in the crushing chamber A is stirred together with the medium 7 by the horizontal rotation of the stirring rods 4 and 5, and at this time, the stirring rods 4 and 5 and the medium 7 are separated from the processed material B. The processed material B is crushed by an impact force or a shearing force generated between them.

During the crushing process, the heat medium or the coolant is supplied from the inlet 13 to the flow passage formed between the crushing tank 8 and the jacket 9 and discharged from the discharge port 14, The medium is in constant circulation while being in contact with the grinding tank 8. On the other hand, the heat medium or the coolant is supplied from the introduction pipe 3 to the flow passage in the stirring shaft 2 and discharged from the rotating shaft 24, and the medium constantly flows while being in contact with the inner wall of the stirring shaft 2. ing. Therefore, the processed material B in the crushing chamber A is heated or cooled by the medium from both the outside of the crushing tank 8 and the inside of the stirring shaft 2. Therefore, the processed material B in the crushing chamber A is always kept at an appropriate temperature by the action of the medium, so that the crushing processing can be made uniform and the efficiency can be improved.

Then, the above-mentioned pulverization processing is continued for a predetermined time until the processed material B has a predetermined particle size. When the processed material B reaches a predetermined particle size, the rotation of the rotary shaft 24 is stopped, the stirring shaft 2 is stopped, and the crushing process by stirring is completed. After that, an external drive device (not shown) is driven to operate the discharge valve 19 to rotate the valve body 19a and open the discharge port 19b. As a result, the processed material B in the crushing chamber A drops downward through the screen 17 of the discharge port 19b and is discharged as a product from the lower opening of the discharge valve box 16.

In the structure of the crusher described above, a uniform crushing process can be performed in the crushing chamber A.

That is, since the stirring shaft 2 is formed to have a large diameter, when the stirring rods 4 and 5 rotate about the stirring shaft 2, the peripheral speed of the tip end portion of the stirring rods 4 and 5 and the root portion thereof. It does not make a big difference with the peripheral speed of.

In the case of the above-mentioned type, since the stirring rods 4 and 5 are radially mounted in the radial direction of the stirring shaft 2, the peripheral speed at each point of the stirring rods 4 and 5 is It is proportional to the distance from the axis of 2 (radius of gyration). In the past, since the stirring shaft was designed to have a small diameter (outer diameter is about 10% of the inner diameter of the grinding tank), the distance from the root to the tip of the stirring rod is large, and therefore the root of the stirring rod is large. There was a large difference between the peripheral speed of the part and the peripheral speed of the tip.

In the present invention, the stirring shaft 2 is formed to have a larger diameter than that of the conventional one (preferably the outer diameter of the stirring shaft 2 is 30% or more of the inner diameter of the crushing tank 8), so that the stirring rod 4 The distance from the root to the tip of 5 is relatively short. For this reason, the difference between the radius of gyration of the roots of the stirring rods 4 and 5 and the radius of gyration of the tip is relatively small. The difference in peripheral speed between the tip and the tip can be reduced.

Therefore, since the mixing / stirring performance for the processed material B can be made substantially the same at the root portions and the tip portions of the stirring rods 4 and 5, near the center of the grinding tank 8 (the surface of the stirring shaft 2). There is no significant difference between the movement of the medium 7 and the processed material B in the vicinity) and the movement of the medium 7 and the processed material B near the inner wall of the crushing tank 8. As a result, the fluidity and mixability of the processed product B are improved in the crushing chamber A, which enables the entire crushing process and makes it possible to obtain a product having a uniform particle size. Has become.

Further, in the structure of the above crusher, the crushing process can be stably performed.

That is, the stirring shaft 2 provided at the center of the crushing chamber A is hollow, and the heat medium or the refrigerant body is circulated inside the stirring shaft 2, and the jacket 9 is provided outside the crushing tank 8 to provide both of them. Since the heat medium or the cooling medium is made to flow between 8 and 9, it is possible to improve the heating or cooling capacity for the processed material B.

That is, the processed material B in the crushing chamber A is heated or cooled by the medium from the stirring shaft 2 on the inner side, and heated or cooled by the medium from the inner wall of the crushing tank 8 on the outer side. Therefore, the product B in the crushing chamber A is effectively heated or cooled by the synergistic effect of the agitation action of the agitation rods 4 and 5, and the temperature distribution of the product B is efficiently distributed. It can be made uniform. For this reason, during the crushing process, the processed material B can be always kept at a predetermined suitable temperature, and therefore, the crushing process is stabilized and a homogeneous product can be obtained.

As described above, in the crusher of the type in which the processed product B is crushed by stirring with the stirring rods 4 and 5, in order to homogenize the obtained product, the fluidity of the processed product B is required. It is an important issue to improve the mixing property and the mixing temperature, and to stabilize the processing temperature. Therefore, in this invention, the difference between the relative radii of rotation between the roots and the tips of the stirring rods 4 and 5 is reduced, so that the stirring between the central portion and the outermost peripheral portion of the grinding chamber A is performed. It achieves uniform performance. Moreover, the medium is circulated in the stirring shaft 2 located at the center of the crushing chamber A, and the medium is also circulated outside the crushing tank 8, whereby the heating or cooling action on the processed material B is improved. It was done like this.

[0038]

[Effect of device]

 As described above, according to the present invention, by forming the stirring shaft with a large diameter, the difference in the peripheral speed between the root portion and the tip portion of the stirring rod that rotates in the horizontal direction together with the stirring shaft is reduced. be able to. Therefore, the crushing force of the stirring rod with respect to the processed material can be made uniform in the entire region from the central part to the outermost peripheral part of the crushing tank, and as a result, the fluidity and the mixing property of the processed material can be improved. You will be able to. Therefore, the pulverizing performance is improved, and a product having a uniform particle size can be obtained.

Further, when the heat medium or the refrigerant body is circulated outside the crushing tank and inside the stirring shaft, it is possible to exert a heating / cooling action on the processed material from inside and outside. Therefore, by improving the heating / cooling ability for the processed material, the processing temperature can be stabilized, and a stable product can be obtained.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the structure of a crusher according to the present invention.

[Explanation of symbols]

 1 ... Connection pipe 2 ... Stirring shaft 3 ... Introducing pipe 4, 5 ... Stirring rod 6, 12, 18, 20 ... Bolt 7 ... Media 8 ... Grinding tank 9 ... Jacket 10 ... Lid member 10a ... hole 11,21 ... sealing member 13 ... inlet port 14,19b ... exhaust port 15 ... bottom 16 ... exhaust valve box 17 ... screen 19 ... exhaust valve 19a ... valve element 22 ... Lever 23 ... Shaft 24 ... Rotating shaft 25 ... Input port 26 ... Lid A ... Grinding chamber B ... Treated material

Claims (3)

[Scope of utility model registration request] 1. A grinding tank (8) having a vertical cylindrical shape.
And a rotatable stirring shaft (2) vertically installed at its center
And a structure of a crusher provided with a plurality of stirring rods (4, 5) which are attached to the stirring shaft (2) in a horizontal direction and rotate integrally when the stirring shaft (2) rotates,
The stirring shaft (2) is formed to have a large diameter, and the stirring rod (4,
A structure of a crusher characterized in that a large difference in peripheral speed does not occur between the root part and the tip part of 5). 2. The structure of a crusher according to claim 1, wherein the stirring shaft (2) has an outer diameter set to 30% or more of an inner diameter of the crushing tank (8). 3. The stirring shaft (2) is formed in a hollow shape to allow a heat medium or a refrigerant body to circulate inside the stirring shaft (2), and a jacket (9) is provided outside the grinding tank (8) to provide both of them. The structure of the crusher according to claim 1, wherein a heat medium or a refrigerant body is passed between (8) and (9).