JPH0235436Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary powder compression molding machine capable of liquid bath cleaning.

[Conventional technology]

For example, in a rotary tablet press, a liquid bath cleaning technique that can eliminate or significantly improve the amount of effort required for cleaning has been developed by the present applicant and has already been filed as Japanese Patent Application No. 60-236373. It is.

This technology is developed by using the rotary disk, the upper and lower punches, the mortar, and the rotary disk while the upper and lower punches and dies are still attached to the rotary disk, and the various molding elements are still arranged around the rotary disk. A bath containing various molding elements is filled with cleaning liquid at least to a level where the upper punch of the molding elements is submerged, and then a rotary disk is rotated under the liquid bath to perform cleaning. In addition, liquid bath cleaning can be carried out by removing both the upper and lower punches and the mortar outside the bath, or after removing at least a part of the molding elements together with these mortars, etc., and then placing the turntable under the liquid bath. This may also be done by rotating.

By the way, some of the molding elements of a rotary powder compression molding machine, such as the pressure roller for the lower punch and the weight rail, are moved up and down, and these are controlled by a control device equipped with a drive device equipped with an electric motor. Operated by a mechanism. The thickness adjustment mechanism that moves the pressure roller for the lower punch up and down to change the thickness of the molded product and the weight adjustment mechanism that moves the weight adjustment rail up and down can be provided within the lower frame of the machine, but If installed in a bathroom, waterproofing measures must be taken against these. Along with this,
Since the lower bearing part that rotatably supports the rotary shaft that supports the rotary disk is also arranged in the bathroom, waterproof measures must be taken for this bearing part as well.

As a waterproofing measure for each of the above-mentioned drive devices and bearings, a sealed chamber is formed using liquid sealing materials such as O-rings and oil seals. A conceivable structure is to apply caulking to the lead-out portions of electrical wires, etc., which are connected to the equipment and passed through the sealed chamber.

[Problem that the invention attempts to solve]

However, such waterproof structures ensure waterproofness only through the performance of the sealing material, so if the sealing material is slightly damaged during use, electric motors etc. may be retracted during liquid bath cleaning. Washing water may enter the closed room.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary powder compression molding machine which prevents cleaning liquid from entering the sealed chamber even if the sealing material is slightly damaged.

[Means for solving problems]

Therefore, in order to achieve the above objectives in a rotary powder compression molding machine that can perform liquid bath cleaning, the present invention has the following features:
A drive device with an electric motor for a thickness adjustment mechanism that moves up and down a pressure roller that pushes up a lower punch to change the thickness of a molded product, and a drive that has an electric motor for a weight adjustment mechanism that moves a weight adjustment rail up and down. The devices are housed in sealed chambers provided in each bathroom, and a sealed chamber is formed in which a bearing is housed in a lower bearing section provided by rotatably supporting a rotary shaft that supports a rotary disk. Then, each of the above sealed rooms,
It is characterized in that it is installed outside the bathroom and is connected to an air pump that continuously blows compressed air into each of the sealed chambers at least during liquid bath cleaning.

[Effect]

In the present invention, compressed air is sent into each sealed room provided in the bathroom by the operation of an air pump. This air supply is continued at least during liquid bath cleaning. The air pressure at that time is set to be greater than the liquid pressure of the cleaning liquid and less than the withstand pressure of the sealing material that ensures the waterproofness of the sealed chamber. Therefore, by continuing to blow compressed air in this way, the internal pressure of the sealed chamber is maintained higher than the liquid pressure of the cleaning liquid, so even if the sealing material is slightly damaged due to this internal pressure, the cleaning liquid will not flow into the sealed chamber. can prevent the infiltration of

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is the body of a rotary powder compression molding machine such as a rotary tablet press, and this is comprised of a lower frame 3 containing a drive mechanism 2, and a plurality of pillars (not shown) mounted on this frame 3. It is provided with an upper frame 4 and a bathroom 5.

The bathroom 5 is divided into upper and lower frames 4, 3, and a plurality of doors 6 which are attached between the upper and lower frames 4, 3 so as to be openable and closable by hinges (not shown). The door 6 is liquid-tight in itself, and has a rubber annular liquid-tight gasket 7 for keeping the bathroom 5 liquid-tight in close contact with the upper and lower frames 4, 3 and the pillars when closed. It is attached to the inner surface of the door 6. Note that the closed state of the door 6 is held by a clamp mechanism (not shown).
By tightening, the gasket 7 is pressed. Moreover, 6a is a transparent panel with which the door 6 is provided.

For example, on the upper frame 4 of the body 1, there is a water supply pipe 8 with one end facing the bathroom 5, and a water level sensor 9.
are installed respectively. Water level sensor 9 is in bathroom 5
When it is detected that the water supply pipe 8 is filled with cleaning liquid to a predetermined water level, a control signal is output to close a solenoid valve (not shown) provided in the water supply pipe 8. The other end of the water supply pipe 9 that protrudes outside the body 1 is connected to a cleaning liquid pump (not shown) installed outside the body 1 or inside the lower frame 3. Further, an annular drain groove 10 is formed in the lower frame 3, and a drain pipe 11 led out from the body 1 is attached to the bottom of the groove 10. An electromagnetic on-off valve (not shown) is attached to this pipe 11.

A vertical rotating shaft 12 extending between the upper and lower frames 3 and 4 is rotatably attached to the center of the fuselage 1 via bearings 13 and 14, and the lower end of the rotating shaft 12 passing through the bearing 14 is connected to a joint 15. It is connected to the drive mechanism 2 via. The rotating shaft 13 supports a rotating disk 16 within the bathroom 5. Several to several tens of dies 17 are attached to this rotary disk 16. Furthermore, an upper punch 18 that is inserted into and removed from the mortar hole of the mortar 17 from above, and a lower punch 19 that forms the bottom of the mortar hole are respectively attached to the rotary disk 16 so as to be movable up and down.

Inside the bath 5, there are various molding elements located around the rotary disk 16, including an open powder feeder (not shown) that is in contact with the upper surface of the mortar attachment part of the rotary disk 16, and a powder feeder fixed to the upper frame 4. An upper punch guide rail 20, a lowering rail (not shown) provided on the lower frame 3 side, a weight adjustment rail 22, a push-up rail (not shown), and upper and lower rails rotatably attached to the upper frame 4 and lower frame 3, respectively. Pressure rollers 23 and 24, a scraper (not shown) provided in contact with the upper surface of the mortar mounting portion, and a chute (not shown) connected to the scraper and guiding the molded product out of the bathroom 5 are provided. Note that at least the outlet side of the chute is removable.

A bearing 13 is supported at the center of the upper punch guide rail 20, and an oil seal 25 is attached below the bearing 13. Also, bathroom 5
A cylindrical lower bearing part 26 is installed in the lower central part of the bearing part 2, and the bearing 14 is mounted inside this bearing part 26. Oil seals 27 are attached to the upper and lower ends of the lower bearing portion 26, respectively, to partition a sealed chamber 28 in which the bearing 14 is housed. A sealed chamber 28 is provided in the lower bearing portion 26.
An air blowing port 28a that communicates with the inside and outside is provided.

Furthermore, a weight adjustment rail 22 is provided at the bottom of the bathroom 5.
A weight adjustment mechanism 29 is provided to move the weight up and down. This adjustment mechanism 29 has a removable cover plate 30.
The driving device 31 is housed in a sealed chamber 30 having a drive unit 31b. The drive device 31 includes an electric motor 3
2, a worm gear mechanism 33 rotated by this motor 32, a lifting shaft 34 that meshes with an internal gear formed in the center of a worm wheel of this mechanism 33, and a rotation speed of the worm gear mechanism 33. It is integrated into a unit equipped with a sensor 35 for detection and the like. The elevating shaft 34 is attached to the sealed chamber 30 so as to be non-rotatable and movable up and down only along the axial direction. A weight adjustment rail 22 is connected to the upper end of this lifting shaft 34. The sealed chamber 30 is provided with an air blowing port 30a that communicates between the inside and the outside. At the same time, the sealed chamber 30 is penetrated by electric wires 36 which are connected to the motor 32 and the sensor 35, respectively. The part of the sealed chamber 30 that meets the lid 30b and the part where the electric wire 36 passes through are coated with caulking 37 for waterproofing, and the part of the lift shaft 34 that passes through the sealed chamber 30 is Waterproofing is provided by an O-ring 38 that allows the shaft 34 to move up and down.

Further, a roller support 39 that supports the lower pressure roller 24 is formed integrally with a sealed chamber 41 of a thickness adjustment mechanism 40 installed at the lower part of the bathroom 5.
This adjustment mechanism 40 changes the thickness of the molded product by moving the pressure roller 24 up and down, and is formed by housing a drive device 42 in a sealed chamber 41 equipped with a removable lid plate 41b. . Drive device 24
comprises an electric motor 43, a gear train 44 interlocked with the motor 43, a roll support shaft 45 connected to the final gear of the gear train 44, and a sensor 46 for detecting the rotation speed of the final gear. It has been made into a unit. The roller support shaft 45 is the roller support 3
9, and a pressure roller 24 is rotatably fitted to and supported by an eccentric shaft provided at an intermediate portion thereof. The sealed chamber 41 is provided with an air blowing port 41a that communicates between the inside and the outside. Along with this, the motor 4 is placed in the sealed chamber 41.
3 and sensor 46 are passed through. Waterproofing measures are taken for the mating part of the lid 41b of the sealed chamber 41 and the penetrating part of the electric wire 47 by applying caulking 48 respectively, and the roller support shaft 45
A waterproof measure is taken with an O-ring 49 for the part through which the sealed chamber 41 is inserted.

The air inlets 28a, 30a, 41a provided in each of the sealed chambers 28, 30, 41 are as follows:
It is connected to an air pump 50 installed outside the bathroom 5. The air pump 50 is operated at least during liquid bath cleaning, and is operated in each sealed chamber 28, 30, 4.
1, the pressure of the blown air is greater than the liquid pressure of the cleaning liquid, and the caulking 37, 48 and O-rings ensure the waterproofness of the sealed chambers 28, 30, 41. 38, 49, and the pressure resistance of sealing materials such as the oil seal 27, for example, approximately 0.2 kg/cm ² . Each electric wire 36, 47 drawn out from each sealed chamber 28, 30, 41 is connected to a connector (not shown) provided on the upper frame 4.

In addition, numeral 51 in the figure indicates an O-ring.

In the rotary powder compression molding machine configured as described above, liquid bath cleaning is performed after the compression molding operation is completed.

For example, in the liquid bath cleaning in this embodiment, the rotary disk 1
With the upper punch 18, lower punch 19, and mortar 17 still attached to the rotary disk 16, and with the various molding elements still arranged around the rotary disk 16, the rotary disk 16, both upper and lower punches 18, 19, and the mortar 17 and a bathroom 5 in which various molding elements are housed, the cleaning liquid is introduced from the water supply pipe 8 to a height where the upper punch 18 of the molding elements is immersed (therefore, the rotary plate 16 is completely submerged in the cleaning liquid). ) After at least filling the liquid bath, main washing is carried out by rotating the rotary disk 16 under this liquid bath, and after draining, rinsing is carried out. After this, if necessary, drain pipe 1
By blowing drying hot air into the bathroom 5 through 1 and exhausting it through a water supply pipe 8, the inside of the bathroom 5 is forced to dry.

Then, during the liquid bath cleaning described above, the lower bearing part 26, the weight adjustment mechanism 29, and the thickness adjustment mechanism 40 are
Both will be submerged in the cleaning solution. By the way, the electric motor 43 and sensor 46 of the thickness adjustment mechanism 40
The drive device 42 has a sealed chamber 41 that is made liquid-tight by caulking 48 and an O-ring 49. A drive device 31 with an electric motor 32 and a sensor 35 of the weight adjustment mechanism 29 also includes:
It is housed in a sealed chamber 30 that is made liquid-tight by caulking 37 and an O-ring 38. The bearing 14 that supported the rotating shaft 12 also has an oil seal 27.
It is housed in a sealed chamber 28 that is made liquid-tight. Therefore, it is normal to prevent the cleaning liquid from entering the sealed chambers 28, 30, and 41 through the oil seal 2.
7. Caulk 37, 48, O-ring 38, 49
This can be prevented by using sealants such as

Moreover, since the air pump 50 is operated at least during cleaning, each sealed chamber 28, 3
0 and 41 have air inlet ports 28a and 30.
Compressed air is continuously fed through a and 41a. As a result, the air pressure in each sealed chamber 28, 30, 41 is maintained higher than the liquid pressure of the cleaning liquid and lower than the withstand pressure of the sealing material that ensures the waterproofness of the sealed chambers 28, 30, 41.

Therefore, even if the sealing material is slightly damaged due to maintaining such internal pressure, the air inside the sealed chamber continues to leak to the outside, so that it is possible to reliably prevent the cleaning liquid from entering the sealed chamber.

[Effect of idea]

According to the present invention, the gist of which is the structure described in the above-mentioned utility model registration claims, there is a sealed chamber housing the drive unit of the weight adjustment mechanism provided in the bathroom, a sealed chamber housing the drive unit of the thickness adjustment mechanism, Also, since the internal pressure of the sealed chamber housing the bearings is raised by continuously blowing compressed air at least during liquid bath cleaning, even if the sealing material of each sealed chamber is damaged, the cleaning liquid will not enter the sealed chamber. There is a practical effect that there is no fear.

[Brief explanation of the drawing]

The drawing is a longitudinal side view showing an embodiment of the present invention. 16... Rotating disk, 18... Upper punch, 19... Lower punch, 17... Mortar, 5... Bathroom, 24... Pressure roller, 40... Thickness adjustment mechanism, 43... Electric motor, 42... ... Drive device, 22 ... Weight adjustment rail, 29 ... Weight adjustment mechanism, 32 ... Electric motor, 31 ... Drive device, 30, 42 ... Sealed chamber,
12...Rotating shaft, 26...Lower bearing part, 14...
Bearing, 28... Sealed chamber, 50... Air pump.

Claims (1)

[Scope of Claim for Utility Model Registration] After filling the bathroom in which the rotating disc is housed with cleaning liquid at least to the height where the rotating disc is submerged,
In a rotary powder compression molding machine that rotates and cleans the rotary disk in this liquid bath, an electric motor of a thickness adjustment mechanism that moves up and down a pressure roller that pushes up the lower punch to change the thickness of the molded product. and a drive device having an electric motor for a weight adjustment mechanism that moves the weight adjustment rail up and down are respectively housed in sealed rooms provided in the bathroom, and a rotating shaft that supports the rotary disk. A lower bearing part rotatably supported forms a sealed chamber in which the bearing is housed, and each of the sealed chambers is installed outside the bathroom and at least during liquid bath cleaning. A rotary powder compression molding machine, characterized in that it is connected to an air pump that continuously blows compressed air into each of the sealed chambers.