JP2017131884A - Crushing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crushing device capable of safely medium-crushing a material to be crushed suspended in a liquefied gas such as liquid nitrogen in a crushing vessel.SOLUTION: A crushing device comprises: a crusher 2 medium-crushing a material to be crushed suspended in a liquefied gas in a crushing vessel 4; a liquefied gas-storing vessel 15 storing the liquefied gas; a pump 24 feeding the liquefied gas from the storing vessel 15 to the crushing vessel 4; a freely openable and closable vacuum insulating case 32 housing the vessel 4 and the storing vessel 15; and a load cell 11 detecting the weight of a suspension in the vessel 4. When the load cell 11 detects that a weight of the suspension in the vessel 4 decreases below a prescribed value during crushing of the material to be crushed in the vessel 4 by the crusher 2, the pump 24 operates to feed the liquefied gas from the storing vessel 15 to the vessel 4, and the pump 24 stops when the load cell 11 detects that the above weight of the suspension in the vessel 4 reaches the prescribed value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pulverizing apparatus capable of pulverizing a material to be pulverized in a liquid that is vaporized at normal temperature and pressure, such as a liquefied inert gas.

  When pulverization is performed using a liquefied gas such as liquid nitrogen, it is necessary to manage the amount of suspension in the pulverization container during pulverization to an appropriate amount. In Japanese Patent Application Laid-Open No. 2014-144410, a liquefied inert gas is taken as an example of this liquid, and the liquid level in the pulverization container can be maintained in a desired range by an upper limit level sensor and a lower limit level sensor. A manufacturing apparatus is disclosed.

JP 2014-144410 A

An object of the present invention is to provide a pulverizer capable of appropriately pulverizing a medium to be pulverized suspended in a liquefied gas such as liquid nitrogen in a pulverization container.
Another object of the present invention is to provide a pulverizer capable of performing continuous pulverization for a long time.
Still another object of the present invention is to provide a pulverizer excellent in workability, maintainability and safety.

  The pulverization apparatus of the present invention includes a pulverizer for pulverizing a medium in a pulverization container for a non-pulverized product suspended in a liquefied gas, a liquefied gas storage container for storing liquefied gas supplied from a liquefied gas supply source, and the liquefying A pump for supplying liquefied gas from a gas storage container to the pulverization container; an openable / closable case for accommodating the pulverization container and the liquefied gas storage container and preventing diffusion of the liquefied gas; and a suspension in the pulverization container A weight detection device for detecting the weight of the suspension, and while the material to be crushed in the pulverization container is pulverized by the pulverizer, the weight detection device determines the weight of the suspension in the pulverization container. When it is detected that the value has decreased below a predetermined value, the pump is operated to supply liquefied gas from the liquefied gas storage container to the pulverization container, and the weight detection device weights the suspension in the pulverization container. That has reached the predetermined value With knowledge, characterized in that the pump is stopped.

The liquefied gas is a liquefied inert gas, and in particular can be liquid nitrogen.
The pulverizer may be a bead mill.
Moreover, the said case can be comprised with a vacuum heat insulation case.
Further, the weight detection device may be a load cell connected to the pulverizer, the vacuum heat insulating case, and a structural member that supports them.

  When the pulverizer of the present invention detects that the weight of the suspension in the pulverization container has decreased below a predetermined value while the pulverized object in the pulverization container is being pulverized by the pulverizer, When the pump is activated to supply liquefied gas from the liquefied gas storage container to the pulverization container, and as a result, the weight detection device detects that the weight of the suspension in the pulverization container has reached a predetermined value, the pump Therefore, even when the medium is pulverized in a liquefied gas that is vaporized at normal temperature and pressure, proper pulverization can be performed.

  In addition, since the pulverizing apparatus of the present invention can automatically replenish a required amount of liquefied gas into the pulverizing vessel, the pulverizing apparatus can perform pulverization for a long time.

  Moreover, since the grinding | pulverization apparatus of this invention seals a grinding | pulverization container and a liquefied gas storage container in cases, such as a vacuum heat insulation case, it can prevent the spreading | diffusion of liquefied gas. Thereby, the safety of the worker can be ensured.

  Other features of the pulverizing apparatus of the present invention will become apparent from the following description with reference to the drawings.

FIG. 1 is a front view including a cross section of a main part of the crushing apparatus of the present invention. Example 1 FIG. 2 is a top view of the crushing apparatus of FIG. FIG. 3 is a left side view of the crushing apparatus of FIG. FIG. 4 is a right side view of the crusher of FIG. FIG. 5 is a left side view of a state in which the grinding disk, the vessel, the vacuum heat insulating upper case, and the vacuum heat insulating lower case are lowered from the grinding device of FIG. FIG. 6 is a front view including a cross section of a main part of another embodiment of the crushing apparatus of the present invention. (Example 2) FIG. 7 is a top view of the crushing apparatus of FIG. FIG. 8 is a right side view of the crushing apparatus of FIG. FIG. 9 is a left side view of the crushing apparatus of FIG. FIG. 10 is a front view showing a state where the grinding disk, the vessel, and the vacuum heat insulating lower case are lowered from the grinding apparatus of FIG. FIG. 11 is an explanatory diagram of a support structure for the vacuum heat insulating case of the crusher of FIG. FIG. 12 is an explanatory diagram of a liquefied gas feeding unit of the pulverizing apparatus of FIG. FIG. 13 is a vertical cross-sectional view of a vessel and a vacuum heat insulating jacket for explaining the structure of the crushing chamber lid of the crushing apparatus of FIG.

  A pulverizing apparatus for pulverizing a raw material to be crushed in liquid nitrogen using a vertical bead mill will be described.

  1 to 5 show a pulverizing apparatus 1 according to the present invention. The pulverizing apparatus 1 has a vertical bead mill 2. The vertical bead mill 2 includes a vessel 4 covered with a vacuum insulation jacket 3, a grinding disk 5 having a rotating shaft to which four disks are attached, a servo motor 7 fixed to the top plate 6, and a servo motor 7. And a square-axis coupler 8 attached to the rotary shaft. The rotating shaft of the grinding disk 5 of the vertical bead mill 2 is detachably connected to the rotating shaft of the servo motor 7 via the angular shaft coupler 8 with one touch. The vertical bead mill 2 rotates four crushing disks 5 inside the vessel 4 by the rotation of the servo motor 7.

  A support plate 10 is fixed to the upper part of the machine casing 9 of the crushing apparatus 1, and a pair of load cells 11 and 12 are installed on the support plate 10 at intervals. The load cells 11 and 12 are connected to the top plate 6 by connecting bars 13 and 14. The top plate 6 is suspended from the support plate 10 of the machine casing 9 by connecting rods 13 and 14 of the load cells 11 and 12.

  The liquid nitrogen supply electromagnetic valve 23 is attached to the support plate 10 of the machine frame 9, is suspended and fixed, and the liquid level detection float 16 disposed inside the liquid nitrogen server 15 is attached to the machine frame 9. The suspension plate 17 is suspended from the support plate 10. The float shaft 17 is supported so as to be slidable in the vertical direction with respect to the support plate 10. A liquid level detection photoelectric switch 18 is fixed to the bottom of the liquid nitrogen server 15, and the liquid level detection photoelectric switch 18 irradiates the bottom surface of the liquid level detection float 16 to position the liquid level detection float 16 in the vertical direction. To detect. On the side of the liquid level detection float 16, a vacuum heat insulation pipe 19 for supplying liquid nitrogen is disposed, and a sintered filter 20 is attached to the tip thereof. The liquid nitrogen supply vacuum heat insulation pipe 19 is fixed to the support plate 10 by a bracket 21, and is connected to a liquid nitrogen supply electromagnetic valve 23 through a pipe 22. The liquid nitrogen supply electromagnetic valve 23 is connected to a liquid nitrogen supply tank (liquid nitrogen supply source) (not shown).

  The liquid nitrogen liquid feed pump 24 includes a liquid feed pipe 25 curved in a U-shape and a check valve 27 attached to a fluid inlet 26 of the liquid feed pipe 25 by a cam mechanism 29 driven by a motor 28. By moving up and down, the liquid nitrogen stored in the liquid nitrogen server 15 is pumped into the liquid feeding pipe 25 from the fluid inlet 26 by the inertial force acting on the liquid nitrogen inside the liquid feeding pipe 25, The fluid is discharged from the fluid discharge port 30 of the pipe 25. The liquid nitrogen feed pump 24 is an inertia pump that transfers liquid nitrogen using an inertial force acting on the liquid nitrogen inside the liquid feed pipe 25. Liquid nitrogen flowing out from the fluid discharge port 30 flows into the vessel 4. The liquid feeding pipe 25 curved in a U shape and the cam mechanism 29 are connected by a connecting rod 31. Further, the motor 28 and the cam mechanism 29 are fixed on the top plate 10, and the liquid feeding pipe 25 curved in a U shape is suspended from the top plate 10 by a connecting rod 31.

  In order to pulverize the object to be crushed in liquid nitrogen using the pulverizer 1, a suspension of the object to be crushed and liquid nitrogen is introduced into the vessel 4, and zirconia beads, for example, are used as the pulverizing medium. throw into. When the medium to be crushed is pulverized by the vertical bead mill 2, the liquid nitrogen in the vessel 4 is vaporized and gradually decreases. This decrease in liquid nitrogen is detected by the load cells 11 and 12 as a decrease in weight. When the amount of decrease in liquid nitrogen reaches a preset value, the motor 28 of the liquid nitrogen feed pump 24 rotates to drive the cam mechanism 29, and the cam mechanism 29 moves the connecting rod 31 and the liquid feed pipe 25 up and down. Let Thereby, the liquid nitrogen in the liquid nitrogen server 15 is replenished to the vessel 4. When the weight of the liquid nitrogen in the vessel 4 reaches a preset value due to the liquid nitrogen replenished to the vessel 4, the motor 28 of the liquid nitrogen feed pump 24 is stopped, and the replenishment of the liquid nitrogen to the vessel 4 is stopped. To do.

  When the liquid nitrogen inside the liquid nitrogen server 15 is supplied to the vessel 4 by the liquid nitrogen feed pump 24 and the liquid level of the liquid nitrogen inside the liquid nitrogen server 15 is lowered, the liquid level detecting float 16 is lowered. When the liquid level detecting float 16 is lowered to a preset liquid level, the liquid level detecting photoelectric switch 18 issues a valve opening signal to the liquid nitrogen supplying electromagnetic valve 23 and the liquid nitrogen server 15 is replenished with liquid nitrogen. As a result, when the liquid level detecting float 16 rises to a preset liquid level, the liquid level detecting photoelectric switch 18 issues a valve closing signal to the liquid nitrogen supplying electromagnetic valve 23, and the supply of liquid nitrogen is stopped. The sintered filter 20 attached to the tip of the vacuum heat insulating pipe 19 for supplying liquid nitrogen gives flow resistance to the liquid nitrogen when the liquid nitrogen flows in, and contributes to supplying the liquid nitrogen as it is.

  The crusher 1 has a vacuum heat insulating case 32. The vacuum heat insulation case 32 includes an upper vacuum heat insulation case 33 and a lower vacuum heat insulation case 34, and the upper vacuum heat insulation case 33 and the lower vacuum heat insulation case 34 can be connected by clamping devices 35 and 36. A guide member 37 extending in the vertical direction is attached to the machine frame 9, and an elevating member 38 is attached to the guide member 37 so as to be slidable in the vertical direction. A lifting winch 39 is also fixed to the machine casing 9, and a wire 40 of the lifting winch 39 is connected to a lifting member 38. A connecting member 41 that is detachably engaged with the elevating member 38 is fixed to the back surface of the lower vacuum heat insulating case 34. When the connecting member 41 is engaged with the elevating member 38 and the elevating winch 39 is wound up, the lower vacuum heat insulating case 34 rises along the guide member 37.

  When the lifting winch 39 is wound up in the state of FIG. 5, the lower vacuum heat insulating case 34 rises with the vessel 4 placed thereon and rises together with the upper vacuum heat insulating case 33. The upper vacuum heat insulating case 33 is fitted to the positioning sealing member 42 fixed to the lower surface of the top plate 6 and is in the state shown in FIGS. The positioning sealing member 42 is formed of a synthetic resin material, and an annular groove 43 in which a sealing O-ring (not shown) is mounted is formed on the outer periphery thereof. 1, 3 and 4, when the clamping devices 44 and 45 are fastened, the vacuum heat insulating case 32 is fixed to the top plate 6, and the inside of the vacuum heat insulating case 32 is sealed.

  In FIG. 1, reference numerals 46 and 47 denote vessel holding members. 3 to 5, reference numeral 48 is a window formed in the upper vacuum heat insulating case 33. The vacuum heat insulating case 32 can be lowered by rewinding the lifting winch 39. The grinding disk 5 can be removed alone. The vessel 4 moves up and down together with the lower vacuum heat insulating case 34. The vessel 4 can be removed after the lower vacuum insulation case 34 is lowered. It is also possible to fix the vessel 4 in a predetermined position of the lower vacuum heat insulating case 34 in advance. In addition, a labyrinth seal can be interposed between the positioning sealing member 42 and the square shaft coupler 8.

6 to 13 show modified embodiments of the crushing apparatus of the present invention. 6 to 12, the same reference numerals as those used in FIGS. 1 to 5 denote the same components that perform the same functions.
The difference between the pulverizer 100 of this embodiment and the pulverizer 1 of the first embodiment will be described.
First, as shown in FIG. 11, the top plate 6 in contact with the vacuum heat insulating case 32 is connected to the support member 54 via the support columns 50 and 51, and the support member 54 is connected to the load cell 11 via the spacers 52 and 53. , 12. As a result, the top plate 6 is not directly connected to the load cells 11 and 12. This is to prevent the top plate 6 from being distorted by a low temperature and affecting the weight detection of the load cells 11 and 12.

  Next, in the pulverizing apparatus 1, the servo motor 7 and the pulverizing disk 5 are connected by the square shaft coupler 8, but in the pulverizing apparatus 100, a coupling 80 generally called “drill chuck” is used instead of the square shaft coupler 8. Is used.

  Next, the pulverizer 1 is a direct connection circuit in which a liquid nitrogen cylinder with a safety valve (liquid nitrogen supply source) is connected to the liquid nitrogen supply heat insulation pipe 19 via the solenoid valve 23 and the pipe 22, but in the direct connection circuit, Since the inside of the pipe is sealed when the electromagnetic valve 23 is closed, when the pressure rises due to the vaporization of liquid nitrogen in the pipe, the pressure is lowered only by the safety valve of the liquid nitrogen cylinder. In the pulverizing apparatus 100, as shown in FIG. 12, an LNG supply safety valve 57 is provided in a supply pipe 56 to which a liquid nitrogen cylinder 55 is connected, and a vent safety valve 59 is provided in a vent passage 58 that bypasses the electromagnetic valve 23. . The vent circuit 58 is designed to have a large pressure loss, so that only the gas passes without passing the liquid. A flexible heater 60 is attached to the entrance of the vent circuit 58 to promote vaporization. Thereby, even if the electromagnetic valve 23 is closed, nitrogen in the piping is safely released as gas. In FIG. 12, V is a pressure release valve attached to the liquid nitrogen cylinder 55. The vent circuit 58 incorporates a vent filter (not shown).

  Next, in the pulverizing apparatus 1, the lifting winch 39 and the wire 40 are used to perform the lifting function of the vacuum heat insulating case 32. However, in the pulverizing apparatus 100, as shown in FIG. A bevel gear 62 is attached to 61, and the bevel gear 62 is engaged with the bevel gear 63 of the screw shaft 64. As shown in FIG. 8, the connecting member 38 is screwed onto the screw shaft 64, and the connecting member 38 is connected to the arm 65. The connecting member 38 constitutes a lifting base. As a result, when the handle 39 is rotated, the screw shaft 64 rotates and the arm 65 moves up and down. By adopting such a configuration, the lifting and lowering device of the crushing device 100 can be easily disassembled and assembled.

  The vessel (grinding chamber) 4 of the grinding device 1 is not provided with a lid. However, beads (grinding medium) may be scattered during pulverization. Therefore, in the pulverizing apparatus 100, as shown in FIG. 13, a lid 66 having a split structure made of heat-resistant glass is installed on the vessel 4. Further, in order to prevent the beads from being caught in the gap 67 between the rotating shaft of the grinding disk 5 and the lid 66, a PTFE vibrating plate 68 having a thickness of 1 mm was attached to the rotating shaft of the grinding disk 5. The distance between the bottom surface of the lid 66 and the swinging plate 68 is about 2 mm, and it is desirable that this distance be minute as long as the swinging plate 68 does not contact the lid 66. However, since the vibrating plate 68 is made of PTFE having a flexible thickness of 1 mm, the lid 66 will not be damaged even if it contacts the lid 66. Further, a funnel 69 is attached to the upper surface of the lid 66, and liquid nitrogen is supplied through the funnel 69.

  When pulverization is performed using a liquid that vaporizes at room temperature and normal pressure, such as liquid nitrogen, it is necessary to manage the amount of liquid in the pulverization chamber during pulverization to an appropriate amount. In the above embodiment, the method of detecting the weight of the liquid using a load cell is shown. However, in addition to this, the method of detecting the liquid level using a temperature sensor, the liquid level height based on the amount of reflection and transmission of the laser, etc. A method for detecting the liquid level and a method for detecting the liquid level by the vertical movement of the float are conceivable. In addition, the liquid replenishment amount is set in advance and the replenishment timing is managed by a timer, and the time management method is used, and the fluctuation of the load applied to the grinding disk and vessel as the grinding progresses is detected. A load detection method for determining the replenishment timing and amount of replenishment can be considered. Furthermore, a gas amount detection method for replenishing the liquid in the pulverization chamber according to the vaporized gas amount, and the liquid level in the pulverization chamber and the shape of the vortex are detected as an image, and the replenishment amount of the liquid is determined by analyzing this image. The image processing method to be determined is also conceivable.

  Since the pulverizer of the present invention is a pulverizer excellent in workability, maintainability and safety, it can be used in various industrial fields.

1 Crusher 2 Vertical bead mill 3 Vacuum insulation jacket 4 Vessel
5 Grinding disk 6 Top plate 7 Servo motor 8 Square shaft coupler 9 Machine frame 10 Support plate 11, 12 Load cell 13, 14 Connecting rod 15 Liquid nitrogen server (liquefied gas storage container)
16 Liquid Level Detection Float 18 Liquid Level Detection Photoelectric Switch 19 Vacuum Insulated Pipe for Supplying Liquid Nitrogen 20 Sintering Filter 23 Electromagnetic Valve for Supplying Liquid Nitrogen 24 Liquid Nitrogen Supply Pump 25 Liquid Supply Pipe Curved in U-Shape 26 Fluid Flow Inlet 27 Check valve 28 Motor 29 Cam mechanism 30 Fluid discharge port 31 Connecting rod 32 Vacuum heat insulating case 33 Upper vacuum heat insulating case 34 Lower vacuum heat insulating case 35, 36 Clamp device 37 Guide member 38 Lifting member 39 Lifting winch 40 Wire 41 Connection Member 42 Positioning sealing member 43 Annular groove 44, 45 Clamp device 46, 47 Vessel holding member 48 Window

Claims (5)

  A pulverizer for pulverizing a medium in a pulverization container for a non-pulverized product suspended in liquefied gas, a liquefied gas storage container for storing liquefied gas supplied from a liquefied gas supply source, and the pulverized container from the liquefied gas storage container A pump for supplying liquefied gas to the container, an openable / closable case for containing the pulverization container and the liquefied gas storage container to prevent diffusion of the liquefied gas, and weight detection for detecting the weight of the suspension in the pulverization container And the weight detecting device has reduced the weight of the suspension in the pulverization container below a predetermined value while pulverizing the object to be crushed in the pulverization container by the pulverizer. When this is detected, the pump is activated to supply liquefied gas from the liquefied gas storage container to the pulverization container, and the weight detection device has reached a predetermined value for the weight of the suspension in the pulverization container. Is detected, There wherein the stopping, milling equipment.   2. The pulverizing apparatus according to claim 1, wherein the liquefied gas is a liquefied inert gas, particularly liquid nitrogen.   The pulverizing apparatus according to claim 1, wherein the pulverizer is a bead mill.   The pulverizing apparatus according to claim 1, wherein the case is constituted by a vacuum heat insulating case. 5. The pulverizing apparatus according to claim 4, wherein the weight detection device is a load cell connected to the pulverizer, the vacuum heat insulating case, and a structural member that supports them.

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