Patent Application
20240051004
The present application claims priority from Japanese Patent application serial no. 2022-127641, filed on Aug. 10, 2022, the content of which is hereby incorporated by reference into this application.
The present invention relates to a roll press machine, and for example, relates to a roll press machine suitable for compressing-processing a thin film material such as an electrode material for a secondary battery such as a lithium ion battery.
It is known that, when a thin film material such as an electrode material for a lithium ion secondary battery is subjected to compression processing by using a roll press machine, concave deflection occurs in a roll due to a reaction force received from a compression material.
In general, the electrode material for a lithium ion secondary battery is required to have an error in compression processing of about ±1 to 2 μm, but the above-described concave deflection occurring in the roll affects the error in compression processing.
Thus, it is necessary to correct the above-described concave deflection occurring in the roll. For example, JP 5097863 B discloses a roll press machine including a bending mechanism that corrects the deflection of the roll by applying a load to the roll in a direction opposite to the deflection of the roll, which occurs due to a processing load of the material, with a bending bearing installed outside the main bearing.
The bending mechanism of the roll press machine disclosed in JP 5097863 B includes a cylinder unit and a piston inside the cylinder unit, and the piston is configured to be connected to a bending bearing by a piston rod. When hydraulic oil is supplied to the inside of the cylinder unit, the piston and the piston rod are operated, and thus the bending bearing moves. A load due to a bending load is applied to the roll, and, in this manner, the concave deflection is corrected.
In the roll press machine disclosed in JP 5097863 B described above, the operating direction of the piston and the piston rod operated by the cylinder is the same as the direction in which the bending bearing moves. Conventionally, since the hydraulic oil is supplied from the piston rod side to the inside of the cylinder, the piston and the piston rod move to the head side of the piston.
Therefore, the cylinder accommodating the piston needs to secure a space for moving the piston to the piston head side. However, in a case where it is necessary to press a material with higher linear pressure than the conventional case, the deflection amount of the roll increases accordingly. Thus, in order to perform deflection correction, it is necessary to increase the bending load applied to the bending bearing.
However, in order to increase the bending load, it is necessary to increase the size of the cylinder. Thus, a problem that a machine housing in which the cylinder is disposed also increases in size, which leads to an increase in the cost of the entire machine occurs.
The present invention has been made in view of the above points, and an object of the present invention is to provide a roll press machine that does not increase in size and does not lead to an increase in cost even if the roll press machine includes a bending mechanism that corrects the deflection of a roll.
In order to achieve the above object, according to the present invention, there is provided a roll press machine that compression-processes a thin film material, the roll press machine including a pair of upper and lower press rolls each including an upper roll and a lower roll that are supported by a main bearing at both ends and rotate at a predetermined speed, upper and lower bending bearings that are disposed outside each of the main bearings and correct deflection of the press rolls by receiving a bending load, and an upper reverse operation bending mechanism provided in the upper roll that operates with hydraulic oil, and a lower reverse operation bending mechanism provided in the lower roll, two upper reverse operation bending mechanisms and two lower reverse operation bending mechanisms being installed in the upper and lower bending bearings, respectively. Deflection occurring in the upper roll and the lower roll is corrected in a manner that a bending load that moves upward the upper bending bearing disposed on the upper roll is applied by causing the upper reverse operation bending mechanism to generate downward power by hydraulic pressure of the hydraulic oil, and a bending load that moves downward the lower bending bearing disposed on the lower roll is applied by causing the lower reverse operation bending mechanism to generate upward power by the hydraulic pressure of the hydraulic oil.
According to the present invention, even if the bending mechanism that corrects the deflection of the roll is provided, the machine does not increase in size and does not lead to an increase in cost.
Hereinafter, a roll press machine according to the present invention will be described based on the illustrated embodiment. In the drawings, the same reference numerals are used for the same components.
As illustrated in
That is, four in total, that is, two upper bending bearings 3a1 and 3a2 and two lower bending bearings 3b1 and 3b2 are disposed on the left and right sides of the upper roll 2a and the left and right sides of the lower roll 2b. Eight in total, that is, two reverse operation bending mechanisms 4 are disposed on each of the upper bending bearings 3a1 and 3a2, and two reverse operation bending mechanisms 4 are disposed on each of the lower bending bearings 3b1 and 3b2.
In the roll press machine in the present embodiment, the reverse operation bending mechanism 4 generates downward power by hydraulic pressure to apply a bending load to the upper bending bearings 3a1 and 3a2 disposed on the upper roll 2a, thereby moving the upper bending bearings 3a1 and 3a2. The reverse operation bending mechanism 4 generates upward power by hydraulic pressure to apply a bending load to the lower bending bearings 3b1 and 3b2 disposed on the lower roll 2b, thereby moving the lower bending bearings 3b1 and 3b2 downward.
As a result, the deflection occurring in the upper roll 2a and the lower roll 2b is corrected to flatten the press roll 2.
As illustrated in
When the hydraulic oil 6a is supplied to the inside of the upper cylinder unit 4a, the upper piston 4a1 and the upper piston rod 4a2 are operated by the hydraulic pressure of the hydraulic oil 6a, whereby power is generated via the upper piston rod 4a2, the power receiving portion 4c receives the power with the rotational support portion 4h as the center, and the power transmission portion 4d is operated in a direction opposite to a direction (the direction of the arrow (A) or (B)) in which the upper piston rod 4a2 operates. Thus, a see-saw operation is performed.
Thus, the upper bending bearing 3a2 abutting on the power transmission portion 4d moves upward (direction of arrow (C)) or downward (direction of arrow (D)) to generate a bending load (reverse operation bending).
As a result, the power from the upper cylinder unit 4a is transmitted to an upper roll shaft 5a as the bending load of the upper bending bearing 3a2, and thus deflection occurring in the upper roll 2a is corrected. An end portion of the power transmission portion 4d may be connected to the upper bending bearing 3a2 in a coupled manner.
In addition, in order to smoothly transmit the power from the upper cylinder unit 4a to the upper bending bearing 3a2, it is desirable that the link portion 4e where the end portion of the power transmission portion 4d abuts on the upper bending bearings 3a1 and 3a2 is formed in an inverted V shape, and the link portion 4e where the end portion of the power transmission portion 4d abuts on the lower bending bearings 3b1 and 3b2 is formed in a V shape.
Next, a mechanism for operating the reverse operation bending mechanism 4 will be described in detail with reference to
As illustrated in
The hydraulic oil supply mechanism 7 includes the hydraulic oil storage 6 that is a tank for storing the hydraulic oil 6a, a hydraulic oil supply device 7a that is a pump for supplying the hydraulic oil 6a from the hydraulic oil storage 6 to the upper cylinder unit 4a, a switching valve 7b that switches a flowing direction of the hydraulic oil 6a by electromagnetic drive, and a pressure reducing valve 7c that adjusts hydraulic pressure of the hydraulic oil 6a supplied to the upper cylinder unit 4a.
Further, the hydraulic oil supply mechanism 7 includes, as pipes connecting the respective components, a first hydraulic oil flow passage 7h that includes a pressure reducing valve 7c at an intermediate position and connects the first opening portion 4f and a second connection port 7b2 provided in the switching valve 7b, a second hydraulic oil flow passage 7i that connects the second opening portion 4g and a fourth connection port 7b4 provided in the switching valve 7b, a hydraulic oil supply passage 7j that includes the hydraulic oil supply device 7a at an intermediate position and connects the hydraulic oil supply port 6b provided in the hydraulic oil storage 6 and a third connection port 7b3 provided in the switching valve 7b, and a hydraulic oil collection passage 7k that connects a hydraulic oil collection port 6c provided in the hydraulic oil storage 6 and the first connection port 7b1 provided in the switching valve 7b.
Next, switching of the flow direction of the hydraulic oil 6a by the switching valve 7b described above will be described in detail with reference to
The first hydraulic oil flow passage 7h, the second hydraulic oil flow passage 7i, the hydraulic oil supply passage 7j, and the hydraulic oil collection passage 7k are connected to the switching valve 7b that drives a valve by electromagnetic drive. In a first operating state (state of
On the other hand, when the second opening portion 4g of the upper cylinder unit 4a communicates with the second hydraulic oil flow passage 7i and the hydraulic oil collection passage 7k, the upper piston 4a1 is pushed downward to discharge the hydraulic oil 6a from the second opening portion 4g to the outside of the upper cylinder unit 4a, and the hydraulic oil 6a is collected in the hydraulic oil storage 6.
In a second operating state (state of
On the other hand, when the first opening portion 4f of the upper cylinder unit 4a communicates with the first hydraulic oil flow passage 7h and the hydraulic oil collection passage 7k, the upper piston 4a1 is pushed upward to discharge the hydraulic oil 6a from the first opening portion 4f to the outside of the upper cylinder unit 4a, and the hydraulic oil 6a is collected in the hydraulic oil storage 6.
When the deflection of the upper roll 2a and the lower roll 2b is corrected, the switching valve 7b is brought into the first operating state of
As a result, as illustrated in
When the bending load is released and the deflection correction of the upper roll 2a is ended, the switching valve 7b is brought into the second operating state of
As a result, as illustrated in
It is desirable that the link portion 4e in the reverse operation bending mechanism 4 sets the disposition position of the rotational support portion 4h such that the length of the power receiving portion 4c is longer than the length of the power transmission portion 4d, and the ratio is set such that power transmission portion 4d:power receiving portion 4c=1:1 or more.
In the conventional deflection correction of the upper roll 2a and the lower roll 2b, the direction of the power output from the upper cylinder unit 4a by the hydraulic pressure of the hydraulic oil 6a is the same as the direction of the bending load applied to the roll shaft 5a by the upper bending bearing 3a2. That is, since the upper piston rod 4a2 and the upper bending bearing 3a2 are directly connected, when bending correction is performed by pulling up the upper bending bearing 3a2 upward in the upper roll 2a, it is necessary to supply the hydraulic oil 6a to the upper piston rod 4a2 side inside the upper cylinder unit 4a and move the upper piston 4a1 upward.
Therefore, when it is necessary to perform pressing at higher linear pressure than in the related art, it is necessary to increase the bending load. As a result, it is necessary to increase the size of the upper cylinder unit 4a in the upward direction, and the machine main body in which the upper cylinder unit 4a is disposed also needs to be increased in size, which results in an increase in cost.
However, in the present embodiment, the link portion 4e is disposed between the upper piston rod 4a2 and the upper bending bearing 3a2, the hydraulic oil 6a is supplied to the head side of the upper piston 4a1 inside the upper cylinder unit 4a to move the upper piston 4a1 downward, and the direction in which the power of the upper cylinder unit 4a is output is set to be opposite to the direction in which the upper bending bearing 3a2 transmits the bending load to the upper roll shaft 5a (reverse operation bending). Thus, it is possible to effectively utilize the downward space on the upper piston rod 4a2 side of the upper piston 4a1 and to operate the upper piston rod 4a2 in the downward direction, so that it is not necessary to increase the size of the upper cylinder unit 4a in the upward direction.
As illustrated in
On the other hand, in the roll press machine in the present embodiment, by supplying the hydraulic oil 6a to the head side of the upper piston 4a1, it is possible to set the entire head-side surface (100%) of the upper piston 4a1 as the pressure receiving area A1 from the hydraulic oil 6a. Therefore, when compared with the pressure of the same hydraulic oil 6a, the output generated by the upper cylinder unit 4a is large, and it is not necessary to increase the cylinder size.
For the above reasons, in the roll press machine in the present embodiment, it is not necessary to increase the size of the machine main body in which the upper cylinder unit 4a is disposed, and it is possible to suppress the cost of the entirety of the machine.
In the reverse operation bending mechanism 4 disposed on the lower roll 2b, the vertical positional relationship (for example, the first opening portion 4f is provided on the side surface of the lower end portion of the lower cylinder unit 4b, and the second opening portion 4g is provided on the side surface of the upper end portion thereof) of the constituent equipment, the transmission direction of the power and the bending load, the movement direction of the lower bending bearings 3b1 and 3b2, and the like are opposite to those of the upper roll 2a, but the other structures and operations are the same as those of the reverse operation bending mechanism 4 disposed on the upper roll 2a.
Next,
As illustrated in
The first hydraulic oil flow passage 7h and the second hydraulic oil flow passage 7i between the upper cylinder unit 4a and the switching valve 7b are connected to the first opening portion 4f and the second opening portion 4g of the upper cylinder unit 4a, respectively, and the direction in which the hydraulic oil 6a flows is switched by the switching valve 7b. When the hydraulic oil 6a is supplied from the first opening portion 4f or the second opening portion 4g to the inside of the upper cylinder unit 4a, the hydraulic oil 6a is supplied from the hydraulic oil storage 6 by driving a hydraulic oil supply device (pump) 7a having predetermined discharge pressure.
As illustrated in
In addition, the roll press machine in the present embodiment includes a control device 8 (see
By bringing the switching valve 7b into the first operating state illustrated in
That is, since the hydraulic oil supply device 7a normally supplies the hydraulic oil 6a by continuously operating at constant discharge pressure (21 MPa), the hydraulic oil 6a is supplied to each switching valve 7b at the same supply amount after branching after supply. The supply pressure per unit time of the hydraulic oil 6a is individually adjusted by the opening degree of the pressure reducing valve 7c, in accordance with the deflection amounts of the end portion of the upper roll 2a and the end portion of the lower roll 2b to set the bending load.
As a result, it is possible to freely adjust bending forces of the upper bending bearings 3a1 and 3a2 and the lower bending bearings 3b1 and 3b2. The hydraulic oil 6a drained by the pressure reducing valve 7c is collected in the hydraulic oil storage 6.
As described above, in each reverse operation bending mechanism 4, the operation of the reverse operation bending mechanism 4 is realized in a manner that the hydraulic oil 6a is supplied from the hydraulic oil storage 6 by the hydraulic oil supply device 7a, and is supplied with switching the flow passage of the hydraulic oil 6a to the first opening portion 4f or the second opening portion 4g by the switching valve 7b, and the hydraulic oil 6a is circulated by the flow passage for collecting the hydraulic oil 6a from the second opening portion 4g or the first opening portion 4f and bringing the hydraulic oil 6a back to the hydraulic oil storage 6.
With such a roll press machine in the present embodiment, even if the roll press machine includes the bending mechanism that corrects the deflection of the upper roll 2a and the lower roll 2b, the machine does not increase in size and does not lead to an increase in cost.
The present invention is not limited to the above embodiment, and various modification examples may be provided. For example, the above embodiments are described in detail in order to explain the present invention in an easy-to-understand manner, and the above embodiments are not necessarily limited to a case including all the described configurations. Further, some components in one embodiment can be replaced with the components in another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Regarding some components in the embodiments, other components can be added, deleted, and replaced.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-127641 | Aug 2022 | JP | national |
