JP2001295805A - Power cylinder mechanism for both screw and oil pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power cylinder mechanism for both screw and oil pressure capable of meeting the demand of both functions requiring a low speed and a high output and requiring rapid traverse in the other process. SOLUTION: This power cylinder mechanism for both screw and oil pressure consists of a rotation/direct acting conversion mechanism composed of a rotary shaft 6 of a ball screw and a nut 11, a screw feeding cylinder mechanism having the rotary shaft 6 therein to move an output shaft 19 directly in accordance with direct acting of the nut 11 by a direct connection mechanism connected directly from an upper end side thereof, and a hydraulic cylinder mechanism composed of a second piston 18 energized by a hydraulic mechanism transmitting energization of a first piston 13 integrated with a lower end of the nut 11 according to Pascal's principle and the output shaft 19 integrated with the second piston 18 to act directly by high thrust. A selective change-over mechanism of both the above mechanisms is constituted by an electromagnetic connector 9 provided in the direct connection mechanism on an upper end side of the nut 11 and a solenoid valve 31 provided in the hydraulic mechanism to integrate the screw feeding cylinder mechanism with the hydraulic cylinder mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder mechanism for applying a thrust to a device used for pressurizing a die in sheet metal working or plastic working or for moving a die in die casting or injection molding. The present invention relates to a thrust applying cylinder mechanism that can move and moves at a low speed but can output a high thrust.

[0002]

2. Description of the Related Art In a mechanism such as cutting of sheet metal processing or pressurization of a mold in plastic working or movement of a mold in mold casting or injection molding, operation requiring low thrust but rapid traverse movement and low speed but requiring high thrust. There is a journey. A screw feed mechanism or a hydraulic cylinder is used to apply these moving thrusts. However, when operating with motors of the same capacity, these mechanisms have a structural problem in that when the thrust is increased, the feed is slowed, and when the feed is increased, a large thrust is not sufficiently obtained.

As described above, the mechanism for moving the mold and the mechanism for tightening include a mechanism using a screw feed mechanism, a mechanism using a cam or a boost mechanism, and a mechanism using a hydraulic cylinder.

A mechanism using a screw feed mechanism can easily control an arbitrary moving distance. In this case, as a method of obtaining a high thrust, the output torque of the motor is converted into a high torque by a speed reducer, and a further reduction in the screw pitch enables a synergistic effect. However, while high thrust can be obtained, there is a problem that the moving speed of the nut cannot be adapted to high speed.

[0005] In the case of using a cam or a booster mechanism, there is a problem that the movement distance cannot be arbitrarily controlled because the moving section is fixed.

[0006] There are two types of piston rod drive systems using a hydraulic cylinder. One is a double-acting piston type mechanism that uses a hydraulic pump to move the rod by applying hydraulic pressure to the piston in the cylinder to move the rod and naturally discharge the opposite oil acting on the piston. One is a double-acting double rod type in which oil in two chambers on both sides of a cylinder is moved by a hydraulic pump with a piston as a boundary. In these two methods, since the capacity of the hydraulic pump is constant at (generated pressure × discharge speed), there is a problem that when a high output is required for the piston, the feed speed of the piston is reduced.

[0007]

In the machining process using the mold, the vicinity of the turning point between the forward and backward strokes in which the mold is moved is low in speed but high output is required. Requires fast forward from the viewpoint of productivity. In response to this demand, a hydraulic cylinder is used as a mechanism having a function to generate the necessary high thrust near the turnback, and the screw feed is performed in the stroke that requires high speed feed before the forward stroke and after the return stroke. An object of the present invention is to provide a mechanism utilizing the features of both mechanisms by directly operating the mechanism and combining and integrating the screw feed cylinder and the hydraulic cylinder.

[0008]

According to the first aspect of the present invention, there is provided a rotary / linear motion converting mechanism comprising a rotary shaft 6 of a ball screw and a nut 11, and a rotary / linear motion converting mechanism. A screw feed cylinder mechanism that has the shaft 6 inside and is directly connected to the upper end side of the nut 11 to directly move the output shaft 19 in accordance with the direct movement of the nut 11, and a separate mechanism from the screw feed cylinder mechanism A first piston 13 integrated with the lower end of the nut 11, and the first piston 13
A hydraulic mechanism that transmits the urging force according to the principle of Pascal, a second piston 18 urged by the hydraulic mechanism, and an output shaft 19 integrated with the lower end of the second piston 18 to directly move with a high thrust An electromagnetic coupler 9 provided in the direct connection mechanism, which comprises a cylinder mechanism, and an alternative switching mechanism of the two mechanisms is directly connected to the upper end side of the nut 11, and an electromagnetic valve 3 provided in the hydraulic mechanism.
1 is a power cylinder mechanism for both screws and hydraulics, wherein a screw feed cylinder mechanism and a hydraulic cylinder mechanism are integrated.

According to the second aspect of the present invention, the electromagnetic coupler 9 provided in the direct coupling mechanism directly coupled to the upper end side of the nut 11 is provided with the nut 1
A hydraulic mechanism using a first piston 13 integrated with a lower end of a nut 11 constitutes a joint mechanism that freely couples and separates the electromagnetic suction disk 12 provided on the upper end side of the nut 1 with an electric signal. A hydraulic coupling mechanism that applies the hydraulic pressure in one cylinder 14 to the second cylinder 21 having a larger cross-sectional area to apply a large thrust to the second piston 18 housed in the second cylinder 21 is provided. 2. The power cylinder mechanism according to claim 1, wherein said power cylinder mechanism is provided in said fluid coupling mechanism, and controls the fluid movement by opening / closing switching of the solenoid valve 31 to adjust the hydraulic pressure.

According to the third aspect of the present invention, the nut 11 has a nut rotation preventing eccentricity preventing plate 10 eccentric to the axis of the ball screw rotating shaft 6 at the upper end and a first integrated lower end.
The electromagnetic coupler supporting eccentric cylinder 7 having a piston 13 and restricting the linear movement of the nut 11 and the rotation of the nut rotation preventing plate 10 and eccentric with respect to the axis of the ball screw. 3. The means according to claim 1, wherein the nut rotation prevention eccentricity prevention plate 10 is provided on the outer periphery of the prevention plate 10 and linearly guided by being constrained and guided by the inner wall of the electromagnetic coupler supporting eccentric cylinder 7. This is a power cylinder mechanism for both screws and hydraulics.

According to the fourth aspect of the present invention, the upper end of the electromagnetic coupler supporting eccentric cylinder 7 is covered with the electromagnetic coupling base 8 so as to regulate the linear movement and rotation of the electromagnetic coupler supporting eccentric cylinder 7 and to use a ball screw. The electromagnetic coupler supporting eccentric cylinder 7 has an eccentric cylinder 15 eccentric to the axis of the electromagnetic coupling coupler supporting eccentric cylinder 7.
4. The power cylinder mechanism for both screws and hydraulics according to claim 1, wherein the power cylinder mechanism is linearly guided by being constrained and guided by an inner wall of the power cylinder.

According to the fifth aspect of the present invention, as the oil storage container that accompanies the movement of the fluid between the first cylinder 14 and the second cylinder 21 when the solenoid valve 31 is opened, the third oil cylinder that is coaxial with the second cylinder 21 and has an annular outer periphery. A cylinder (23) is provided, and a movable annular piston (26) is slidably disposed between the second cylinder (21) and the third cylinder (23), and an upper portion of the movable annular piston is a third cylinder volume (29). A power cylinder mechanism for both screws and hydraulic pressure according to any one of the above-mentioned means. It is.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a servo motor, 2 is a pulley, and 3 is a timing belt. In this case, for the sake of convenience, the pulley 2 will be referred to as the upper part of the screw / hydraulic power cylinder mechanism of the present embodiment, and will be described as being arranged vertically. However, it goes without saying that the arrangement state is free, and the arrangement state can be horizontal or diagonal.
The power cylinder for both screws and hydraulics of the present invention is driven by the power of the servo motor 1. The screw / hydraulic power cylinder of the present invention includes a rotation / linear motion conversion mechanism including a rotation shaft 6 of a ball screw and a nut 11, and a direct connection mechanism having the rotation shaft 6 therein and directly connected to the upper end side of the nut 11. , A screw feed cylinder mechanism that linearly moves the output shaft 19 in accordance with the linear movement of the nut 11, a first piston 13 integrated with the lower end of the nut 11, and the bias of the first piston 13 is transmitted by the principle of Pascal. A hydraulic cylinder mechanism that is directly driven by a high thrust and includes a second piston 18 biased by the hydraulic mechanism, and an output shaft 19 integrated with a lower end of the second piston 18. In the present invention, a ball screw is used instead of a combination of a direct rotation of the nut and a simple rotary shaft, because the rotation is smooth, the speed is high, and the reliability of the direct motion is high.

This screw feed cylinder mechanism has an electromagnetic coupler supporting eccentric cylinder 7 made of a cylindrical body, an upper end is covered with an electromagnetic coupler base 8, and a lower end integrally has a first cylinder 14. The inside of the electromagnetic coupler supporting eccentric cylinder 7 passes through the ball screw rotating shaft 6 at a position slightly eccentric from the center. A nut 11 having a built-in ball screw is screwed to the rotating shaft 6. This nut 11 has a nut rotation preventing eccentric plate 10
Are formed integrally therearound. The rotation preventing eccentric disk 10 is a disk, and has a nut 11 at a position eccentric from the center of the disk. At the lower end of the nut 11, a ball screw rotating shaft 6 is provided inside so as to be freely rotatable.
A piston 13 is mounted. First piston 13
The outer diameter of the lower half of the first cylinder 1 is reduced, and the first cylinder 1 extends downward integrally from the bottom of the lower end of the eccentric cylinder 7 supporting the electromagnetic coupler.
4, the first cylinder volume 27 is formed.
The first piston 13 slides on the bottom of the lower end of the eccentric cylinder 7 supporting the electromagnetic coupler, the first cylinder 14 and the honey ring. In addition, the upper end of the nut 11 has an electromagnetic suction disk 1
2 integrally. On the other hand, the electromagnetic coupler base 8 forming the lid of the electromagnetic coupler supporting eccentric cylinder 7 has a hole through which the ball screw rotating shaft 6 freely passes, and the inside of the electromagnetic coupler base 8 is an electromagnetic The electromagnetic coupling 9 is directly and electromagnetically connected to the electromagnetic suction plate 12.

The first cylinder 14 integrated with the bottom of the eccentric cylinder 7 supporting the electromagnetic coupler slides on the honey by the honey ring at a position where the disc-shaped cylinder / ball screw connecting board 17 is eccentric. The lower end thereof is integrally connected to a disk-shaped second piston 18. Further, the lower end of the second biston 18 is connected to and integrated with an output shaft 19 which is a piston rod for applying an output to the outside. Output shaft 1
Inside 9, a cylindrical hollow portion 20 is formed. The second piston 18 is provided at the lower end of the first piston 13 in the cylindrical hollow portion 20.
Piston retraction terminal 25 for retracting
Is screwed.

Further, an eccentric cylinder 15 is integrally provided on the outer periphery of the upper end of the cylinder / ball screw connection board 17. An electromagnetic coupler supporting eccentric cylinder 7 is slidably fitted in the eccentric cylinder 15 so as to be vertically and linearly movable, and the length of the eccentric cylinder 15 is substantially equal to the electromagnetic coupler supporting eccentric cylinder. The length is twice as long as the cylinder 7 and regulates the linear movement stroke of the electromagnetic coupler supporting eccentric cylinder 7.
However, the length of the eccentric tube 15 is not limited to twice the length described above, but what is the linear movement stroke of the electromagnetic coupler supporting eccentric tube 7, in other words, the screw feed cylinder mechanism that moves linearly Is determined as appropriate according to the amount of linear motion of The upper end of the eccentric tube 15 is integrally closed by a disk-shaped ball screw rotating shaft support substrate 16. The ball screw rotating shaft support substrate 16 has a through hole at an eccentric position of the disk so as to allow the ball screw rotating shaft 6 to pass through, and the rotating shaft 6 is supported by a bearing. The rotation shaft 6 protruding above the ball screw rotation shaft support substrate 16 has a pulley 4, and the lower gear of the pulley 4 meshes with the gear of the adjacent ball screw rotation angle detector 5. The ball screw rotation angle detector 5 is supported at one end of the ball screw rotation shaft support board 16. The ball screw rotation angle detector 5 detects the rotation angle of the rotation shaft 6 of the ball screw using a device according to Japanese Patent Application No. 2000-81375 of the applicant's invention, and detects the rotation of the nut 11 by the rotation of the rotation shaft 6. This is a device for detecting the position, and the distance for directly moving the nut 11 may be set in advance.

The cylinder / ball screw connection base 17 is connected to a second cylinder 21 and a third cylinder 23 having a double annular inner cylinder and an outer cylinder at an outer portion of the lower end thereof.
The lower ends of the cylinder 21 and the third cylinder 23 are integrally joined to a cylinder mounting base 24, respectively. The inner periphery of the second cylinder 21 is slidably in contact with the second piston 18 in a liquid-tight manner by a liquid-tight ring. The length of the second cylinder 21 and the third cylinder 23 is determined by the length of the linear movement of the second piston 18, that is, the length of the linear movement of the eccentric cylinder 7 supporting the electromagnetic coupler by the screw feed cylinder mechanism, and the length of the hydraulic cylinder mechanism. The length of the linear movement of the second piston 18 that is linearly moved by the hydraulic pressure pressurized by the first piston 13 due to the linear movement of the nut 11 in the electromagnetic coupler supporting eccentric cylinder 7 is adjusted. The length shall be guaranteed. 2nd cylinder 2
An annular movable annular piston 26 is slidably fitted to the liquid honey between the first and third cylinders 23. And the upper part of the movable annular piston 26 forms a third cylinder volume 29 with the cylinder / ball screw connection base 17,
The lower part of the movable annular piston 26 is the cylinder mounting base 24.
An air cylinder 30 is formed between them to repel the movable annular piston 26 upward by air pressure. Instead of the air pressure of the air cylinder 30, a coil spring may be formed between the movable annular piston 26 and the cylinder mounting base 24 in a resilient manner. Further, the lowering of the second piston 18 reduces the capacity of the second cylinder volume 28 to the first cylinder 14.
Between the second cylinder 21 and the third cylinder 21
When the cylinder volume 29 decreases, the pressure is automatically reduced, and the movable annular piston 26 rises. Therefore, the air cylinder 30 does not need to be repelled by air pressure to the air cylinder 30 below the movable annular piston 26, and this portion may be a simple empty space communicating with the outside.

In the above, the first cylinder 14 and the first cylinder 14
A first cylinder volume 27 formed between the lower diameter portion of the lower portion of the piston 13 and a second cylinder volume 28 between the first cylinder 14 and the second cylinder 21 are formed by an oil passage hole 22 provided at the lower end of the first cylinder 14. And a third cylinder between the second cylinder 21 and the third cylinder 23 via a solenoid valve 31 in the oil passage above the second cylinder volume 28 in the cylinder / ball screw coupling board 17. It communicates with the volume 29. The electromagnetic valve 31 is freely opened and closed by an electric signal.

In the above-described power cylinder mechanism for both screw and hydraulic use of the present invention, the rotary shaft 6 of the ball screw and the nut 11
When the ball screw rotating shaft 6 is rotated, the nut, the electromagnetic coupler supporting eccentric cylinder 7 and the eccentric cylinder 15 have a perfect circular cross section without rotating each of them, even if the ball screw rotating shaft 6 is rotated. The rotating shaft 6 is disposed at a position deviated from the center of the nut rotation preventing eccentric plate 10 integrated with the nut 11 so as to move directly along the shaft 6, and further, an electromagnetic coupler support for accommodating the rotating shaft 6. The eccentric cylinder 7 and the eccentric cylinder 15 also have the rotating shaft 6, the first piston 13 or the first cylinder 14 positioned at a position deviated from the center. But,
In order to prevent the nut, the electromagnetic coupler supporting eccentric tube 7 and the eccentric tube 15 from rotating by rotating the rotating shaft, the cross section is not a perfect circle but a deformed shape, or a guide for preventing rotation between each. Is possible. However, the structure in which the rotating shaft 6 of the present invention is eccentrically arranged is the simplest structure and can suppress the cost.

As described above, the direct connection mechanism of the present invention is a nut rotation preventing eccentric disk 10 integrated on the upper end of a nut 11, an electromagnetic suction disk 12 integrated thereon, and an electromagnet The electromagnetic coupler 9 and the electromagnetic coupler base 8 integrated with the electromagnetic coupler 9, the electromagnetic adsorber eccentric cylinder 7 integrated therewith and having the first cylinder 14 below, and the lower end of the first cylinder 14 Integrated second
The piston 18 includes an output shaft 19 that is a piston rod that acts on a thrust and is connected to a lower end of the second piston 18. The output shaft 19 is connected to a cylinder mounting base 24.
And slides in a liquid-tight manner.

The operation of the screw / hydraulic power cylinder mechanism of the present invention will be described below. First, in the state of FIG. 1, the power switch is turned on, then the solenoid valve 31 is opened and turned off, and the electromagnetic coupler is turned on to excite and couple the electromagnetic suction disc 12 of the nut rotation preventing eccentric disc 10 to the servo. The power of the motor 1 is turned on. When the power of the servo motor 1 is turned on, the rotation of the servo motor 1 in the forward direction is transmitted from the pulley 2 to the pulley 4 by the timing belt 3, and the ball screw rotating shaft 6 rotates forward. By the way, as shown in FIG.
The linear motion distance of the nut 11 is set in advance by the ball screw rotation angle detector 5. Therefore, the rotation of the rotating shaft 6 prevents the ball screw nut 11 engaged therewith from being prevented from rotating by the eccentricity prevention board 10 and the electromagnetic coupler supporting eccentric cylinder 7.
The nut 11 is linearly moved by the ball screw and moves downward of the pair, but the electromagnetic coupler supporting eccentric cylinder 7 integral with the electromagnetic coupler base 8 is also moved downward by the cylinder 11. It moves directly to the ball screw connection base 17 side. Therefore, in this case, the nut 11 remains at the upper part of the eccentric cylinder 7 supporting the electromagnetic coupler. This electromagnetic coupler supporting eccentric cylinder 7
The first cylinder 14 descends in the cylinder / ball screw connection base 17 by the linear motion of the second piston 18 and linearly moves down the second piston 21 in the second cylinder 21 to be integrated with the lower end of the second piston 18. A thrust is applied to the output shaft 19 to make it protrude from the cylinder mounting board 24. At this time, the second cylinder volume 28 is expanded by the lowering of the second piston 18, and the oil in the third cylinder volume 29 is transferred to the expanded second cylinder volume 28 via the solenoid valve 31. Then, the state shown in FIG. 2 is obtained. In the above, the rotation of the servomotor 1 is transmitted to the rotating shaft 6 at a high speed, and the rotating shaft 6 rotates at a high speed. Therefore, a thrust is applied to the outside directly connected by the direct connection mechanism such as the nut 11 and the eccentric cylinder 7 supporting the electromagnetic coupler. Output shaft 1
9 moves forward at a high speed. The above is the operation of the screw feed cylinder mechanism that thrusts at high speed while having low thrust in the first stage.

Next, the second stage is shifted to a hydraulic cylinder mechanism that directly moves the output shaft 19 with high thrust. In the first stage, the eccentric cylinder 7 supporting the electromagnetic coupler is linearly moved to the lower cylinder / ball screw coupling base 17 side while the nut 11 is connected and positioned at the upper end side by the electromagnetic coupler 9. It descends and is in the state shown in FIG. The second stage starts continuously from the state shown in FIG. That is, when the electromagnetic coupler supporting eccentric cylinder 7 reaches the position shown in FIG. 2, the nut 11 moves by a distance set in advance by the ball screw rotation angle detector 5, the electromagnetic coupler 9 is turned off, and excitation is lost. The nut is released from the electromagnetic coupler 9. On the other hand, the solenoid valve 31 is closed off, so that oil cannot transfer to the third cylinder volume 29. In this state, when the servo motor 1 further rotates in the forward direction and the rotation shaft 6 rotates forward, the coupling is released from the electromagnetic coupling supporting eccentric cylinder 7 and the electromagnetic coupling supporting eccentric cylinder 7
The nut 11 linearly moves down the inside. As the nut 11 linearly moves down, the first piston 13 integrated with the nut 11 linearly moves downward. The lower half of the first piston 13 has a small diameter, and forms a first cylinder volume 27 with the first cylinder 14 on the outer peripheral side thereof to contain oil. Therefore, as the first piston 13 linearly moves downward, the large-diameter first piston 1 above the first cylinder volume 27
3, the first cylinder volume 27 is reduced and the oil is pressurized and moved from the two oil passage holes 22 on the left and right to the second cylinder volume 28. At this time, since the solenoid valve 31 is on and closed, the oil is stored in the third cylinder volume 2
There is no transition to 9. Then, the second piston retraction terminal 25 at the tip of the small diameter portion of the first piston 13 enters the cylindrical hollow portion 20 above the output shaft 19. Then, by the pressurization of the first piston 13, the oil in the second cylinder volume 28 pushes the second piston 18 further downward with a high thrust according to the principle of bascal, and at the same time, the first cylinder 14 slightly moves downward, and The output shaft 19 integrated by being pushed by the two pistons 18 exerts a high thrust further downward and advances downward to reach the state shown in FIG. In the above, the first piston 13 is a fast-forward piston that moves directly at high speed. On the other hand, at this time, the rotation of the servo motor 1 is stopped by the preset ball screw rotation angle detector 5, and the advance of the output shaft 19 is stopped. Of course, it is also possible to stop by manually turning off the power of the servo motor 1 while the output shaft 19 is moving forward. Thus, the pressurization of the output shaft 19 in the second stage by the high thrust is completed.

When the output shaft 19 is raised and retracted,
All mechanisms are assumed to behave in a manner opposite to that described above. First, in the state of FIG. 3, the electromagnetic valve 31 is turned on and closed. In this state, when the stopped servomotor 1 is turned on in the reverse direction, the nut 11 is moved to the electromagnetic coupling supporting eccentric cylinder 7.
The electromagnetic suction disk 12 of the nut rotation preventing eccentric disk 10 at the upper end of the nut 11 abuts against the electromagnetic coupler 9 of the electromagnetic coupler base 8 which is the lid of the electromagnetic coupler supporting eccentric cylinder 7. At this time, the oil in the second cylinder volume 28 is
Through to the first cylinder volume 27. With this transition, the second piston 18 rises a little by the decrease of the second cylinder volume 28, and at the same time, the output shaft 19 also rises a little and retreats, so that the electromagnetic coupler supporting eccentric cylinder 7 also rises a little. In this case, the speed of raising the nut 11 is high, but the speed of retreating the output shaft 19 is low. First
The second piston retraction terminal 25 at the tip of the piston 13 rises inside the cylindrical hollow portion 20 of the output shaft 19 and the second piston 1
8 contacts the lower end. And it will be in the state of FIG. In the state shown in FIG. 2, the solenoid valve 31 is turned off and opened, and the second cylinder volume 28 communicates with the third cylinder volume 29. In the state of FIG. 2, the output shaft 19 can be further retracted, and the nut 11 rises at high speed and moves directly by the reverse rotation of the rotating shaft 6. In this case, the electromagnetic coupler 9 need not be excited, but may be excited. As the nut 11 moves up at a high speed, the electromagnetic coupler base 8 is raised, so that the electromagnetic coupler supporting eccentric cylinder 7 integral therewith also rises rapidly.
The cylinder 14, the integrated second piston 18 and the integrated output shaft 19 are rapidly raised and retracted.
At this time, the oil in the second cylinder volume 28 is moved to the third cylinder volume 29, which is an oil storage tank, through the solenoid valve opened by the rise of the second piston 18. This is because the volume of the first cylinder volume 27 is smaller than the volume of the third cylinder volume 29. As described above, the upper end of the second piston 18 linearly rises until it comes into contact with the cylinder / ball screw coupler board 17, and at the same time, the power of the servo motor 1 is turned on by the preset ball screw rotation angle detector 5. It is cut off and the rotation is stopped, resulting in the state of FIG.

As described above, in the state of the first stage screw feed cylinder mechanism, the output shaft 19 moves at a high speed by moving at a constant speed with the nut 11. On the other hand, in the hydraulic cylinder mechanism of the second stage, the output shaft 19
Moves slowly but has high thrust.

In the above operation, if the oil in the first cylinder volume 27 is confined in the second cylinder volume 28 for the function of the latter second stage, the former first stage becomes immobile and cannot be realized. Therefore, when the nut 11 and the output shaft 19 are made to perform the same body movement in the former first stage,
It is necessary to prepare a spare chamber in which the second piston 18 moves or discharges the fluid in the second cylinder volume 28. In order to fulfill the functions of the oil reservoir and the accumulator for the moving fluid, a third cylinder 23 which is an outer peripheral cylinder coaxial with the second cylinder 21 is provided to have a third cylinder volume 29.

Due to the necessity of sealing off the fluid movement in the third cylinder volume 29 in order to obtain the second stage of high thrust, 4-6
The solenoid valves 31 are arranged on the outer periphery of the cylinder / ball screw coupling board 13 to electrically open and close the solenoid valves 31 and to turn on and off the electromagnetic suction board 12 according to the purpose of the first stage operation and the second stage operation. Control.

The integral movement of the nut 11 and the output shaft 19 is established when the electromagnetic valve 31 is opened and the electromagnetic suction disk 12 is turned on.
On the other hand, when the movement of the nut 11 is made to perform a high thrust conversion function by hydraulic pressure, the electromagnetic valve 31 is closed and the electromagnetic suction disk 12 is closed.
Can be realized by switching off.

For the positioning of the output shaft 19, the movable range of the nut 11 in the ball screw is detected by the rotation angle detector 5, and at the same time, a rotation angle sensor (not shown) of the servo motor 1 is used. The difference in the amount of movement of the output shaft 19 between the direct screw feed mechanism and the hydraulic feed mechanism per rotation of the nut 11 can be corrected by switching between different calculation routines for the positioning calculation of the servo controller.

A screw feed hydraulic power cylinder is obtained which enables positioning control by switching between two stages for fast traverse and high thrust.

[0030]

As described above, the present invention provides a rotation / linear motion conversion mechanism including a rotation axis of a ball screw and a nut,
A direct connection mechanism having a ball screw rotation shaft inside and directly connected to the upper end side of the nut allows the output shaft 1 to be driven in accordance with the direct movement of the nut.
9, a first piston integrated with the lower end of the nut, a second piston 18 biased by a hydraulic mechanism that transmits the bias of the first piston by the principle of Pascal, By using a device including the output shaft 19, which is a piston rod integrated with the second piston 18, the present invention provides a method for performing a forward stroke and a return stroke of moving a mold in a machining process using the mold. In the vicinity of the turning point, it is possible to output a high thrust at a low speed but at a low speed, and it is possible to perform a rapid traverse from the viewpoint of productivity in other processes, thereby achieving an unprecedented superior effect at low cost and high productivity.

[Brief description of the drawings]

FIG. 1 is a side view, partially in section, of a start-up standby state of a screw / hydraulic power cylinder mechanism of the present invention.

FIG. 2 is a side view showing a partial cross-sectional view of the screw feed cylinder mechanism of the screw / hydraulic power cylinder mechanism of the present invention in a state where the operation of the screw feed cylinder mechanism is completed and the hydraulic cylinder mechanism is in a start standby state.

FIG. 3 is a side view showing, in a partial cross section, the operation end state of the hydraulic cylinder mechanism of the screw / hydraulic power cylinder mechanism of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Servo motor 2 Pulley 3 Timing belt 4 Pulley 5 Ball screw rotation angle detector 6 Ball screw rotation shaft 7 Electromagnetic coupler supporting eccentric cylinder 8 Electromagnetic coupler base 9 Electromagnetic coupler 10 Nut rotation prevention eccentric board 11 Nut 12 Electromagnetic Adsorber 13 1st biston 14 1st cylinder 15 Eccentric cylinder 16 Ball screw rotation shaft support base 17 Cylinder / ball screw connection base 18 2nd biston 19 Output shaft 20 Cylindrical cavity 21 2nd cylinder 22 Oil passage hole 23 No. 3 cylinder 24 cylinder mounting base 25 second piston retraction terminal 26 movable annular piston 27 first cylinder volume 28 second cylinder volume 29 third cylinder volume 30 air cylinder 31 electromagnetic board

Claims (5)

[Claims] 1. A nut / nutrition conversion mechanism comprising a rotation shaft 6 of a ball screw and a nut 11, and a direct connection mechanism having a rotation shaft 6 therein and directly connected to an upper end side of the nut 11.
And a first piston 13 integrated with the lower end of the nut 11 and comprising a screw feed cylinder mechanism for linearly moving the output shaft 19 in accordance with the linear motion of the nut 1 and a separate mechanism from the screw feed cylinder mechanism.
A hydraulic mechanism for transmitting the bias of the first piston 13 based on the principle of Pascal, a second piston 18 biased by the hydraulic mechanism, and an output shaft 19 integrated with the lower end of the second piston 18. An electromagnetic coupling 9 provided in the direct connection mechanism directly connected to the upper end side of the nut 11 and an electromagnetic valve 31 provided in the hydraulic mechanism. And a screw cylinder and a hydraulic cylinder mechanism, and a power cylinder mechanism for both screws and hydraulics. 2. An electromagnetic coupler 9 provided in a direct connection mechanism directly connected to an upper end side of a nut 11 constitutes a joint mechanism that is freely coupled and separated by an electric signal from an electromagnetic suction disk 12 provided on an upper end side of the nut 11, The hydraulic mechanism by the first piston 13 integrated with the lower end of the nut 11 applies the hydraulic pressure in the first cylinder 14 that accommodates the first piston 13 to the second cylinder 21 having a larger cross-sectional area to the second cylinder 21. A fluid coupling mechanism that gives a large thrust to the accommodated second piston 18 is provided, and a solenoid valve 31 provided in the hydraulic mechanism is disposed in the fluid coupling mechanism, and restricts fluid movement by opening and closing switching of the solenoid valve 31. 2. The power cylinder mechanism according to claim 1, wherein the hydraulic pressure is adjusted. 3. A nut rotation preventing eccentricity prevention board 1 having an upper end eccentric with respect to the axis of the ball screw rotating shaft 6.
0, and has a first piston 13 integrated at the lower end, restricts the linear movement stroke of the nut 11 and the rotation of the nut rotation preventing eccentricity preventing plate 10 and is eccentric with respect to the axis of the ball screw. An electromagnetic coupler supporting eccentric cylinder 7 is provided on the outer periphery of the nut rotation preventing eccentric prevention board 10, and the nut rotation preventing eccentric preventing board 10 is directly guided by the inner wall of the electromagnetic coupler supporting eccentric cylinder 7. 3. The screw according to claim 1 or 2, wherein
Power cylinder mechanism for both hydraulic and hydraulic use. 4. The electromagnetic coupler supporting eccentric cylinder 7 has its upper end covered by an electromagnetic coupler base 8, restricts the linear movement and rotation of the electromagnetic coupler supporting eccentric cylinder 7, and is positioned with respect to the axis of the ball screw. The electromagnetic eccentric cylinder 15 is provided on the outer periphery of the electromagnetic coupler supporting eccentric cylinder 7, and the electromagnetic coupling supporting eccentric cylinder 7 is linearly guided by being constrained and guided by the inner wall of the eccentric cylinder 15. The screw / hydraulic power cylinder mechanism according to any one of claims 1 to 3. 5. A third cylinder 23, which is coaxial with the second cylinder 21 and has an outer periphery, is provided as an oil storage container along with movement of fluid between the first cylinder 14 and the second cylinder 21 when the solenoid valve 31 is opened. 2nd cylinder 21 and 3rd
The movable annular piston (26) is slidably disposed between the cylinders (23), and the upper part of the movable annular piston is a third cylinder volume (29).
The power cylinder mechanism for both screws and hydraulics described in the section.