JPH11120997A - Rotary powder compression molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the wear resistance and reduce the expendable item cost by providing a structure such that a member rotatable around the axial center of each rising and falling body is supported by the upper end of an upper rising and falling body and the lower end of a lower rising and falling body in such a manner as to be easily replaceable in a state where a molding pressurizing force or pellet pushing force is received. SOLUTION: In the lower end of a lower rising and falling body 8, a wear resisting rotatable end surface member 3 having a substantially protruding section is supported in such a manner as to be rotatable around the shaft center 8a of the lower rising and falling body 8 while receiving a pellet molding load or a force for pushing out a pellet from a die. To the end surface member 3, 2-4 permanent magnets 1 are buried and fixed so as to be easily replaceable. For the upper end of an upper rising and falling body, the same countermeasure to wear or frictional force reducing means as in the lower rising and falling body 8 is performed to reduce the local wear of the surfaces of upper and lower pressurizing rollers and a cam, and the replacement is also facilitated by the supporting structure by utilizing the magnetic attracting force of the permanent magnets 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder compression molding machine for forming a pellet mixture, which is used in a process of manufacturing an alkaline manganese dry battery or the like.

[0002]

2. Description of the Related Art Mixture pellets used in an alkaline manganese dry battery are formed into a ring shape from a powder which is a mixture of manganese dioxide, carbon powder, an aqueous solution of potassium hydroxide, and the like using a powder compression molding machine. Conventionally, a powder compression molding machine used for manufacturing dry cell pellets has a configuration as shown in the front view of FIG.
They procure and use materials commonly used widely in the pharmaceutical and food industries.

[0003] As can be seen from FIG. 7, powder for the mixture is supplied onto the turntable 7 from the lower discharge port 15 of the hopper 14 in which the powder for the pellet is stored. Using a rotary motion, a predetermined amount of powder is supplied into a large number of dies 6 arranged at equal intervals on a circle concentric with the rotating disk 7. In addition, upper and lower lifting bodies 9 and 8 and a cam 10, upper and lower pressing rollers 12 and 11, etc., which are supported on a rotating plate so as to be able to ascend and descend and are disposed above and below the center line of the die, respectively. Then, a pressing force is applied to the mixture powder supplied into the die to form a pellet, and after the molding, the completed pellet is taken out from the die, inserted into a case of a dry battery, and incorporated.

[0004] The rotary powder compression molding machine shown in Fig. 7 shows a state in which a die for manufacturing a disk-shaped pellet is attached. Requires a die structure having a center pin. However, a die structure for producing a ring-shaped pellet is a technique generally and widely known from the past. Briefly described with reference to FIG. 8, in a powder compression molding machine generally used for the production of pellets for a dry battery and the like, a large number of upper elevating members supported on a rotating disk 7 so as to be able to elevate and lower are described. 9 and the lower lifting body 8
When the vehicle travels to a predetermined station with the rotation of the turntable, the upper and lower ends thereof contact and slide with the upper pressure roller 12, the lower pressure roller 11, a cam (not shown), and the like. Along with this, the upper and lower elevating bodies perform the elevating operation and the forming operation, but are simultaneously worn and damaged.

In the conventional rotary powder compression molding machine, in order to prevent these problems, as can be seen from Japanese Utility Model Application Laid-Open No. 56-55599 and Japanese Utility Model Application Publication No. To improve wear resistance by heat treatment or various surface treatments, and to mechanically fix the wear-resistant material to the end of the elevating body using screws or bolts. Measures were taken. However, in the production process of pellets for alkaline dry batteries, high capacity of batteries has recently been particularly strongly demanded,
Efforts have been made to form the mixture pellets at a high density and incorporate as much of the mixture as possible into the limited small battery case.

[0006] Further, in order to stabilize the performance of the battery and further stabilize the manufacturing process, it is strongly required to stabilize the dimensions of the pellets. For this reason, it has been strongly required to increase the molding pressure of the powder compression molding machine. For reference, the case of a powder compression molding machine used in the pellet manufacturing process for a single type dry battery is described. Recently, a molding load exceeding 10 ton has been applied. Therefore, it has been required to improve the wear resistance of the end portions of the upper and lower elevating bodies.

[0007] Further, a detailed observation of the state of wear of the end of the elevating body reveals that the elevating body is rarely worn evenly around the axis thereof, and is often unevenly worn. Was. Furthermore, when the wear-resistant member is fixed to the end of each of the upper and lower lifting bodies with bolts or the like, each of the lifting and lowering bodies is supported on the turntable and travels on a circumference concentric with the turntable. In addition, it has been found that a large force acts to rotate the abrasion-resistant end face member at the same time as it slides up and down by contacting and sliding with upper and lower pressure rollers and cams.

[0008] However, both the upper and lower elevating bodies are supported so that they can slide up and down with respect to the turntable and move up and down, but cannot rotate.

[0009]

In the conventional powder compression molding machine as described above, the wear-resistant end face member fixed to the end of the elevating body not only wears in a short period of time, but also In some cases, the bolt to which the abrasion-resistant end face member was fixed was subjected to a shearing force to rotate around the axis of the elevating body, and the bolt was cut. Furthermore, when the abrasion-resistant end face member is fixed to the elevating body with bolts, stress concentration occurs due to compressive or shearing force in the "counterbore holes" of the bolt, and cracks are generated from this portion, and crack resistance occurs. In some cases, the wearable end face member was damaged within a very short time. Further, as described above, since the compression force of the powder compression molding machine has been particularly increased recently, it is used in dry batteries in addition to the fact that a large force acts on the center pin, the upper punch, the lower punch, the die, and the like. The mixture for pellets contains a large amount of manganese dioxide particles with sharp edges and high hardness. It exerts a similar malfunctioning effect as grains, and tends to shorten the life of molds and various parts.

[0010] In order to cope with this problem, a structure and a material for improving abrasion resistance are used. In addition to the fact that an effective countermeasure is difficult and particularly a part which is susceptible to abrasion or damage, it is easy to replace. Is divided into a plurality of smaller parts, such as a part that was considered as one part, a part that is easily damaged, and a part that is hardly damaged,
It is becoming increasingly important to replace only damaged parts locally to reduce consumable costs and maintenance costs.

[0011]

In order to solve the above-mentioned problems, in the present invention, abrasion-resistant members are not fixed to the upper end of the upper elevating body and the lower end of the lower elevating body. Although it is easy to replace the wear-resistant rotatable member around the axis of the cam, the cam and the rotatable member are supported so that they do not fall off from the end or fall, and are rotatable. Reduce the frictional force and wear when contacting the pressure roller.

This eliminates the need to provide a screw hole for fixing the wear-resistant member to the end surface of the elevating body or a "counterbore hole" for a bolt in the wear-resistant member. Since cracks that often occur as a starting point can be eliminated, the operation rate and reliability of the equipment can be greatly increased, and maintenance costs can be reduced.

Further, when the pellets are extruded upward from the die using a lower punch after the pellets are formed,
The lower end of the lower elevating body is not fixed to the surface of the cam that slides in contact with the lower elevating body.Similarly to the lower pressure roller used for compression molding, it is continuous in the direction substantially coincident with the movement direction of the lower end of the lower elevating body. As the surface of a movable device or a rotatable roller, when the end face component of the lower elevating body slides in contact, the amount of abrasion and frictional force are reduced by shortening the length in which the sliding occurs.

Nevertheless, the abrasion-resistant rotatable end face member rotates around the axis of both lifting and lowering bodies while receiving the load during molding and pellet extrusion, so that the molding machine can be operated for a long period of time. When this is done, wear occurs on the surfaces of both the upper and lower elevating bodies constituting these sliding surfaces and the abrasion-resistant rotatable end face member supported at the end of the elevating body. If variations occur due to wear with respect to the overall length of the elevating body, the height of the formed pellets varies,
Further, it also affects the density of the pellet, which is not preferable. From the conception stage of the powder compression molding machine design, the wear-resistant rotatable member provided at the end of the elevating body was designed to be replaced when it was worn by a predetermined dimension. It is not preferable from the viewpoint of the equipment operation rate and the maintenance from the viewpoint that the total length of the upper and lower elevating body bodies, which are provided and are expensive in terms of cost, varies and needs to be replaced.

Therefore, as measures to reduce the adverse effects of wear on the overall length of the elevating body, (1) various surface treatments, heat treatments and lubrication measures are taken.

(2) A large difference in wear resistance is provided between two parts that are liable to wear, and most of the wear is generated on the easily replaceable rotatable member side. Replace when value is reached.

(3) The length of the main body of the elevating body is made independent of wear by exchanging two parts, ie, a rotatable member provided at the end of the elevating body and a part supporting the rotatable member.

The above method is adopted. Also, as a measure to reduce the replacement cost due to wear and damage of the center pin and lower punch, these parts, which were conventionally considered as one part, are divided into two parts: a part that is easily damaged and a part that is hardly damaged. It is further divided and only the damaged part is locally replaced to reduce the cost of consumable parts.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be briefly described with reference to the drawings. FIG. 1 (a)
FIG. 8 is a partial cross-sectional view of a lower elevating body 8 showing an example of a case where the present invention is implemented in a powder compression molding machine as shown in FIG. FIG. 1B is a plan view of the lower elevating body of the present invention.

At the lower end of the lower elevating body 8, a wear-resistant rotatable end member 3 having a substantially convex cross section is provided with a pellet forming load or a force for pushing the pellet out of a die. 8 is supported so as to be rotatable around the axis 8a. The protrusion of the wear-resistant rotatable end face member 3 is rotatably fitted with a hole provided around the axis 8a of the lower elevating body, and is rotated around this axis to thereby rotate the lower elevating body. And the frictional force and abrasion generated on the sliding surface of the end portion and the lower pressure roller 11, the cam 10, and the like. Of course, since the hole of the lower elevating body 8 and the projection of the rotatable end face member 3 are fitted with each other, the rotatable end face member is rotatable around the axis 8a of the lower elevating body unless the projection comes out of the hole. 3 rotates, but does not cause displacement. The wear-resistant end face member 3 includes a permanent magnet 1.
2 to 4 are embedded and fixed, and are magnetically attracted to the main body of the lower elevating body 8 made of steel, and furthermore, are prevented from falling due to their own weight while utilizing the frictional force of the O-ring 2. Therefore, the rotatable end face member 3 does not fall off from the end of the lower elevating body 8.

If the weight of the rotatable end face member 3 is relatively light, it is possible to prevent the permanent magnet 1 or the O-ring 2 from dropping off. Further, instead of the O-ring, it is implanted at the lower end of the lower elevating body 8 in a direction intersecting with the axis 8a of the lower elevating body 8,
It may be supported by a pin protruding into a ring-shaped groove formed concentrically with the axis of the rotatable end member 3.

Since the wear-resistant rotatable end member 3 is rotatably supported around the axis of the lower elevating body, the rotatable end member 3 and the cam 10, the lower pressure roller 11 In such a case, locally unevenly distributed wear almost disappeared, and the amount of wear generated on the contact surface between the cam of the rotatable end face member and the lower pressure roller 11 was greatly reduced. Some wear remains.

As a measure to improve the abrasion resistance of the rotary sliding surface 4, the end surfaces of the upper and lower elevating body bodies 9 and 8 are
After increasing the hardness to about 62 HRC (Rockwell hardness) by heat treatment, the surface is subjected to hard chrome plating with a thickness of 2 to 5 μm, and the abrasion-resistant rotatable end member 3 is heat-hardened to HRC 60 by heat treatment. After that, the surface is subjected to a chemical conversion treatment, and further grease is applied and assembled, so that the wear of the sliding surface 4 is reduced as much as possible. A countermeasure is taken such that it is generated on the member 3 side and hardly generated on the main body side of the elevating body 8.

Further, in the direction intersecting the rotation direction of the end face member 3 and in the direction in which grease is fed toward the inner shaft core by the rotation of the end face member 3, several oil grooves 23 having a depth of about 1 mm and a width of about 3 mm are provided. When processed on the surface of the book, the end face member or the elevating body, the effect of improving the wear resistance was remarkably recognized. In addition, as other measures for improving the abrasion resistance, methods such as chemical conversion treatment and metal or ceramic coating were also effective.

As another embodiment of the present invention, as shown in FIG. 2, a roller shaft 3-2, which is oriented in a direction perpendicular to the axis 8a of the elevating body and the running direction 8b, is provided at the end of the lower elevating body 8. A method is also conceivable in which the cylindrical roller 3-1 rotating around is provided to reduce the wear and frictional force of the bolt-fixed end member 3a in FIG.

When the roller shaft 3-2 is fixed to the main body 8 of the lower elevating body by the set screw 3-3, and the cylindrical roller 3-1 is rotated around the roller shaft, wear occurs. Is generated only at the inner and outer diameters of the cylindrical roller 3-1 and the roller shaft 3-2, and has the advantage that it can be performed independently of the main body of the lower elevating body. Needless to say, the surface of the cylindrical roller 3-1 and the roller shaft 3-2 are also subjected to measures for improving wear resistance and reducing frictional force, such as heat treatment, plating, chemical conversion treatment, and supply of coating lubricant. I can do it.

The upper end of the upper elevating body 9 that contacts the upper pressure roller 12 is also subjected to the same measures for wear and friction as for the lower elevating body, but the measures and effects are almost the same as those of the lower elevating body. This is the same, and since the mounting position of the rotatable end member 3 is different, the only difference is that the end member does not almost fall due to its own weight.

FIG. 3 is a sectional view of the embodiment showing a state in which the support portion 22 of the rotatable end face member 3 is attached to the lower end of the lower elevating body 8. The rotatable end member 3 is supported by a support portion 22 of the rotatable end member fixed by screws so as to be concentric with the elevating body 8, and the rotatable end member 3 is supported while the powder compression molding machine of the present invention is operating. It rotates around the axis 8a. For this reason, the sliding portion between the rotatable member 3 and the support member 22 is worn by the operation of the molding machine, but the rotatable member 3 does not directly contact and slide with the main body of the elevating body 8. The body length of the elevating body 8 does not change due to wear. Therefore, even if the rotatable member 3 or the support member 22 wears out over a long period of operation, it is only necessary to replace these two parts that are relatively easy to replace, and it is not necessary to replace the main body of the elevating body 8. .

FIG. 4 shows a state in which the pellet 24 is pushed upward from the inside of the die 6 using the lower punch 13 fixed to the upper part of the lower elevating body 8 after the pellet formation.
Here, in a rotary powder compression molding machine, a lower end of a lower elevating body supported on a rotating disk 7 so as to be able to move up and down is fixed to a cam 10 fixed to a frame of the molding machine as the rotating disk rotates.
In order to reduce the frictional force and the amount of wear generated between the lower end of the lower elevating body 8 and the cam 10 when the pellet 24 is pushed out by contacting with the roller, a rotatable push-up roller 25 is used instead of the fixed cam. Is shown (the process order proceeds from right to left). When extruding the pellets, a large force acts on the lower punch because the outer peripheral surface of the pellet has a slight draft slope, so the first in the pellet extrusion stroke of the lower punch It is only a part and only a length corresponding to 1/5 to 1/3 of the height of the pellet. Therefore, the gap is pushed up by the push-up roller 25, and the pushing stroke of the remaining lower punch is provided at the lower end of the lower elevating body by the cam follower 20 and the fixed cam 10 provided on the side surface of the lower elevating body. The pellet can be extruded using the rotatable member 3 and the fixed cam 10 provided below the rotatable member 3.

FIG. 5 (a) shows that the center pin 21 according to the present invention is positioned inside the die 6 at the time of pellet molding, and the upper held portion 21-1 forming the ring-shaped space for pellet molding. Is divided into two parts, a lower part 21-2 that holds the upper held part 21-1, and replaces only the upper held part that is likely to be in contact with the powder and that is susceptible to wear and damage. An embodiment in the case where cost is reduced is shown. FIG. 5B shows a shape of the center pin 21 before the conventional improvement for comparison.

FIG. 6 (a) shows a graph based on the present invention.
The conventional lower punch 13 is divided into three parts, and in order to replace only the upper part, which is likely to be in contact with powder and pellets and is easily worn,
An example in the case of dividing into three is shown in a sectional view.

FIG. 6B is a cross-sectional view showing a state where the split lower punch, the split center pin, and the like of the present invention are assembled to the lower elevating body.

[0033]

According to the present invention, a structure in which a rotatable wear-resistant end face member is supported on the upper end of the upper elevating body or the lower end of the lower elevating body, and a pellet that slides on the lower end of the lower elevating body. The extrusion cam was modified into a roller, and the sliding surface of these parts was subjected to heat treatment, plating, ceramic coating, lubricant supply, and other measures to improve wear resistance. The wear is greatly reduced overall with the reduced local wear on the upper and lower pressure rollers, cams and other surfaces that are in sliding contact with the rotatable lift end face members and the ends of these lifts, The frictional resistance also decreased. In addition, breakage of the abrasion-resistant end face members, which were fixed to the ends of the upper and lower elevating bodies with bolts, was also greatly reduced. Regarding the remaining wear parts, the maintenance cost is greatly increased by making it possible to easily replace relatively inexpensive parts by using a structure that uses the magnetic attraction of a permanent magnet to support them. The efficiency of the powder compression molding machine was also improved.

[Brief description of the drawings]

1A is a cross-sectional view showing a state in which a wear-resistant rotatable end face member of the present invention is supported on a lower end of a lower elevating body. FIG. 1B is a plan view showing a lower end of the lower elevating body of the present invention.

FIG. 2A is a front view showing a lower end of a lower elevating body according to another embodiment of the present invention. FIG. 2B is a plan view showing a lower end of the lower elevating body according to another embodiment of the present invention.

FIG. 3A is a front view showing the lower end of a lower elevating body according to another embodiment of the present invention. FIG. 3B is a plan view showing the lower end of a lower elevating body according to another embodiment of the present invention.

FIG. 4 is a diagram showing a state in which a part of the cam according to the present invention is changed to a roller.

5A is a front view showing a disassembled state of the split center pin of the present invention. FIG. 5B is a front view of a conventionally used center pin.

FIG. 6 (a) is a front view showing a split type lower punch according to the present invention; FIG. 6 (b) is a front view showing a split lower punch of the present invention assembled to a lower elevating body;

FIG. 7 is a front sectional view of a conventional rotary powder compression molding machine.

FIG. 8 is a sectional view showing a molding unit when molding a ring-shaped pellet using a conventional rotary powder compression molding machine.

9A is a front sectional view showing a lower elevating body of a conventional rotary powder compression molding machine. FIG. 9B is a plan view showing a lower elevating body of a conventional rotary powder compression molding machine.

[Description of Signs] 1 Permanent magnet 2 O-ring 3 Rotatable end face member 3-1 Cylindrical rotatable roller 3-2 Rotatable roller shaft 3-3 Set screw 3a Bolt-fixed end face member 4 Elevator and rotatable member Sliding surface 5 bolt 6 die 7 turntable 8 lower lifting body 8a lower lifting body shaft core 8b running direction of lower lifting body 9 upper lifting body 10 cam 11 lower pressure roller 12 upper pressure roller 13 lower punch 14 hopper 15 lower Discharge port 16 Lower punch upper end held portion 17 Cap nut 18 Tapered part with slit 19 Lower punch boss 20 Cam follower 21 Conventional center pin 21-1 Split type center pin held portion of the present invention 21-2 Split type of the present invention Center pin holding portion 22 Rotating end member support portion 23 Oil groove 24 Pellet 25 Push-up roller

Continuation of the front page (72) Inventor Hiroshi Takebayashi 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] 1. A plurality of upper and lower lifting bodies,
On the rotating plate of the powder compression molding machine, at equal intervals on the concentric circumference of the rotating plate, and supported so as to be able to move up and down, each elevating body along the rotation of the rotating plate while traveling on the circumference, In order to make each lifting body move up and down and pressurize,
The upper and lower elevating bodies and the lower and lower elevating bodies come into contact with the cam and the pressure roller to slide and contact with the cam or the pressure roller. As a measure against breakage or wear, a member that can rotate around the axis of each lifting body under the state of forming pressure or pellet pushing force applied to the upper end of the upper lifting body and the lower end of the lower lifting body, respectively. A powder compression molding machine characterized in that it is configured to easily support the powder compression molding machine. 2. The method according to claim 1, wherein a plurality of upper and lower lifting bodies are provided.
On the rotating plate of the powder compression molding machine, it is supported at equal intervals and on the circumference concentric with the rotating plate, and it can be lifted and lowered. In order to make the lifting and lowering operation and the pressing operation to the lifting and lowering body, the upper lifting and lowering body caused by sliding the upper end of the upper lifting and lowering body and the lower end of the lower lifting and lowering body in contact with the cam and the pressure roller. As a measure against breakage and wear of the contact sliding surface with the cam or the pressure roller of the lower elevating body, the upper end of the upper elevating body and the lower end of the lower elevating body are respectively orthogonal to the axis of the elevating body, and A powder compression molding machine, comprising: a roller having an axis perpendicular to a direction in which an elevating member travels and rotatable under a molding pressure or a pellet pushing force. 3. A means for preventing the rotatable end member supported at the upper end of the upper elevating body or the lower end of the lower elevating body from dropping and displacing by means of a magnetic attraction force by a permanent magnet and / or a frictional force of an O-ring. A ring that is supported or implanted at the lower end of the lower elevating body in a direction intersecting with the axis of the lower elevating body, and is processed to be concentric with the axis of the rotatable end surface member with respect to the rotatable end surface member. 2. The powder compression molding machine according to claim 1, wherein the powder compression molding machine is supported by a pin protruding into the groove. 4. A rotatable end face member supported at an upper end of an upper elevating body or a lower end of a lower elevating body, and rotating with a main body end face of an upper or lower elevating body that slides in contact with the rotatable end member. By providing a difference in wear resistance between the possible members, a large part of the wear generated by the rotation of the rotatable member is caused on the surface on the side of the rotatable end face member, so that the upper or lower lifting body The powder compression molding machine according to claim 1 or 2, wherein abrasion occurring on the main body side end surface is suppressed. 5. A rotatable end face member provided at an upper end of an upper elevating body or a lower end of a lower elevating body, and a supporting portion thereof.
Or, as a measure to improve the abrasion resistance on one or both surfaces of the supporting member and the rotatable member of the rotatable roller and its shaft, heat treatment, chemical conversion treatment, hard chrome plating, metal or ceramic coating. 3. The powder compression molding machine according to claim 1, wherein at least one of the surface treatments is applied, or at least one of the surface treatments is subjected to oil groove processing. 6. A replaceable rotatable end surface member support portion is provided at the upper end of the upper elevating body or the lower end of the lower elevating body, and wear generated by rotation of the rotatable end surface member is mainly rotatable. The powder compression molding according to claim 1 or 2, wherein the structure is generated only at the supporting portions of the end face member and the rotatable end face member, and is independent of the main bodies of the upper and lower lifting members. Machine. 7. A cam surface that slides on a lower end of a lower elevating body having a lower punch attached to an upper end thereof when the formed pellet is pushed upward from a die by a lower punch. The powder compression molding machine according to claim 1 or 2, wherein the device is a supported roller or a device capable of continuous movement in one direction. 8. In a powder compression molding machine for molding a ring-shaped pellet, a center pin or a lower punch, which is a main component constituting a lower elevating body, is provided with a rotatable and held part to be worn or damaged, A split structure that is divided into non-rotating body-shaped holding parts with less wear and damage, and when any of these members is damaged due to wear or the like, only those members can be locally replaced. A powder compression molding machine. 9. A held portion which has a circular cross section and which needs to be replaced due to wear or other wear,
Divided into two or more parts that have a tapered part on the outside diameter or inside diameter and do not require replacement, make the inside diameter of the holding part approximately the same as the outside diameter of the held part, and configure the holding part A component having a tapered portion on the outside diameter is provided with a plurality of slits that pass through the axis and equally divide the holding portion to have a structure that can be elastically deformed, and a component having a tapered portion on the outside diameter has a tapered portion on the inside diameter. 9. The divided center pin or lower punch can be integrally joined by reducing the inner and outer diameters of the holding portion by pressing against a component having a cap nut using a cap nut-shaped component. Powder compression molding machine.