JP2004174577A - Slide locking device of press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent impact force from being generated when a slide falls. <P>SOLUTION: A slide locking device is equipped with: a body frame 2 of the slide locking device fixed on a press body; a screw shaft 3 which is arranged in a manner inserted in the body frame and extends perpendicularly and which has in the lower end a catch capable of locking a slide from below; a nut member 4 screwed onto the screw shaft; a rotary control mechanism 5 for the screw shaft; a rotary driving means 6 for the nut member; a cylindrical member 7 for holding the nut member so that the nut member can be raised or lowered for a prescribed small distance; a hydraulic cylinder 8 having a hydraulic chamber 41; and a pressing member 9 for elastically pressing the cylindrical member upward. In addition, there are provided: a pump 10 and an oil tank 11 which supply pressure oil to the hydraulic chamber of the hydraulic cylinder; and a switching valve 12 which is installed in a path 52 connecting the hydraulic chamber and the pump to the oil tank and which is at a cut-off position when the slide is locked and at a communicating position when the lock is released. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide lock device of a press machine for locking a slide so as not to move downward when repairing the press machine or a mold, and particularly to a lock device for preventing an impact force from being generated when a slide falls.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various slide lock devices that restrict downward movement of a slide with respect to a press body when repairing a press or replacing a die have been put to practical use. Conventional slide lock devices are provided with various release mechanisms for preventing the slide lock from being unlocked due to excessive fastening when locking the slide. For example, it is as shown in Patent Document 1. The outline is, in a slide lock device for locking a slide to a press main body of a press machine so as to be unlockable and restricting the downward movement of the slide, a main body frame fixed to the press main body side; A screw shaft that is provided in a penetrating manner, extends vertically and has a locking portion that can lock a slide from below at a lower end portion, and a nut member rotatably supported by the main body frame and screwed to the screw shaft. A rotation restricting mechanism for restricting the rotation of the screw shaft, and a rotation drive unit including a drive motor for rotationally driving the nut member. A cylindrical member that supports the nut member so as to be able to ascend and descend a predetermined small distance via a receiving step abutting from below, A plurality of biasing members elastically biasing upward, an annular hydraulic cylinder including an annular piston portion and an annular cylinder hole formed in the tubular member and the main body frame, and an annular hydraulic cylinder formed in the main body frame. An oil tank and a throttle oil passage having a throttle function for connecting an oil chamber of the annular hydraulic cylinder to the oil tank are provided.
[0003]
When the slide is locked by the slide lock device when the press machine is repaired or the mold is repaired, the nut member is rotationally driven by the rotation driving means, and the screw shaft is driven up. At this time, since the cylindrical member and the nut member are urged upward by the plurality of urging members, the screw shaft is driven to rise while floating above the main body frame by a predetermined small distance. When the screw shaft is raised and the locking portion at the lower end abuts against the lower surface of the slide, the screw member does not rise and the nut member rotates, so that the cylindrical member and the nut member Is pulled downward, the floating state is relaxed, the oil pressure in the oil chamber of the annular hydraulic cylinder rises, and the tubular member and the nut member are supported with respect to the main body frame via the oil pressure due to the increased oil pressure. You. At this time, a part of the oil pressure in the oil chamber is released to the oil tank through the throttle oil passage. However, the lock operation is completed in a state where the oil pressure in the oil chamber is maintained at a high pressure, and the detection from the detection switch provided separately is performed. The drive motor is stopped based on the signal. After that, if the time elapses while the slide is locked, the oil pressure in the oil chamber leaks from the throttle passage to the oil tank, so the oil pressure in the oil chamber decreases, and the lock fastening force for locking the slide decreases. When releasing, the escape torque for reversing the nut member does not matter, and the release can be performed smoothly.
[0004]
[Patent Document 1]
JP-A-11-245100 (column 5, line 22 to line 29, column 7, line 31 to column 8, line 18; see FIG. 3)
[0005]
[Problems to be solved by the invention]
In the slide lock device, the hydraulic pressure in the oil chamber of the hydraulic cylinder is reduced to prevent the lock from being unlocked even when the slide is locked, and the tightening force of the slide lock device is reduced. Further, the output of the drive motor is such that the mass of the screw shaft is increased, and it is not possible to generate the same tightening force as the mass of the slide. Therefore, the conventional slide lock device does not actively tighten the slide, and when the slide falls, that is, when the entire mass of the slide acts on the screw shaft, an impact force is applied to the slide lock device. In order to increase the safety factor in terms of strength against impact force, it is necessary to increase the size of each member, and there is a problem that the size of the slide lock device is increased and the manufacturing cost is increased.
SUMMARY OF THE INVENTION An object of the present invention is to provide a slide lock device in which when a slide is dropped, an impact force due to the fall is not generated, and a safety factor in strength which is substantially the same size as that of the related art and is large can be obtained.
[0006]
[Means for Solving the Problems]
Means of the present invention include a main body frame of a slide lock device fixed to the press main body side, and a locking portion that is disposed in a state inserted into the main body frame, extends vertically, and can lock a slide at a lower end portion from below. , A nut member rotatably supported by the main body frame and screwed to the screw shaft, a rotation restricting mechanism for restricting rotation of the screw shaft, and a rotation driving means for rotating the nut member A cylindrical member that is rotatably fitted to the nut member so as to be relatively rotatable, and that supports the nut member so as to be able to move up and down a predetermined small distance via a receiving step that contacts the step of the nut member from below; A hydraulic cylinder having a hydraulic chamber formed with a cylinder hole and a piston portion by the member and the main body frame and subjected to a compressive action by a downward displacement of the cylindrical member; A plurality of biasing members for elastically biasing the cylindrical member upward with respect to the main body frame; and a slide lock device of the press machine for locking the slide to the main body of the press machine and restricting the downward movement of the slide. A pump and an oil tank for supplying pressurized oil to a hydraulic chamber of the hydraulic cylinder, and a passage provided between the hydraulic chamber and the pump to be connected to an oil tank. And a switching valve that is set to a communication position when released.
[0007]
When the slide is locked by the slide lock device when the press machine is repaired or the mold is repaired, the switching valve is set in a communicating state in advance, the nut member is rotationally driven by the rotation driving means, and the screw shaft is driven up. At this time, since the cylindrical member and the nut member are urged upward by the plurality of urging members, the screw shaft is driven to rise while floating above the main body frame by a predetermined small distance. When the screw shaft rises and the locking part at the lower end abuts against the lower surface of the slide, the nut member rotates without raising the screw shaft. It is attracted downward and the floating state is alleviated. At this time, the oil in the hydraulic chamber of the hydraulic cylinder is released to the oil tank through the passage, the cylindrical member and the nut member are supported with respect to the main body frame by the elastic urging force, and the ascending drive of the screw shaft is stopped. The driving of the driving means is stopped based on a detection signal from a detection switch provided.
[0008]
After that, the switching valve is switched to the shut-off position, the pump is operated to supply oil to the hydraulic chamber of the hydraulic cylinder, the cylindrical member is displaced upward, and the slide is actively performed via the nut member, the screw shaft, and the locking portion. Tighten in the lifting direction, and lock is completed when the tightening force is equal to or slightly larger than the slide mass + the die mass. Since the slide is positively tightened with the force of the slide mass + the mold mass or a slightly larger eye force, no impact force is generated even if the slide falls.
[0009]
It is preferable that the pump and the pump control device are provided on a main body frame. When the pump and the pump control device are provided on the main body frame, the number of pipes and wires between the press machine and the slide lock device is reduced, the length of the pipes and wires is reduced, and the number of maintenance and inspection points is reduced, which is easier. In addition, the installation work becomes easy, and the period and cost of the installation work can be reduced.
[0010]
Preferably, the power source of the pump uses compressed air and is a pneumatically driven hydraulic pump. When a pneumatic drive hydraulic pump is used, the discharge oil pressure of the pump is proportional to the supply air pressure, and by adjusting the air pressure with a regulator, any discharge oil pressure can be easily obtained, and the tightening force of the slide Can be easily adjusted according to the slide mass of the press machine + the mold mass.
[0011]
Preferably, an oil tank is formed between the main body frame and the cylindrical member, and the oil tank is used as the cylindrical member and the tank. When an oil tank is formed between the main body frame and the tubular member, and the tubular member and the oil tank are also used, the size of the slide lock device can be reduced, and the manufacturing cost can be reduced.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. The slide lock device 1 includes a main body frame 2, a screw shaft 3, a nut member 4, a rotation restricting mechanism 5, a rotation driving unit 6, a cylindrical member 7, a hydraulic cylinder 8, a biasing member 9, a pump 10, an oil tank 11, It comprises a switching valve 12 and the like.
[0013]
The main body frame 2 is formed by connecting and forming the frame members 13, 14, 15, 16, 17 shown in FIG. 1, and is formed in a short cylindrical shape having a flange at an upper end thereof. It is fixed below the crown 19. The slide 20 is provided with a lock overhang 21 corresponding to the slide lock device, and the overhang 21 is formed with a vertical U-shaped groove 22. A screw shaft 3 described later of the slide lock device 1 passes through the U groove 22.
[0014]
The screw shaft 3 has a retaining portion 23 at the upper end, a large part of the screw shaft 24 is formed on the screw portion 24, and a locking portion 25 is provided at the lower end. The locking portion 25 is a so-called hammer head and has a size that passes through the U groove 22 of the slide 20, but engages with the lower edge of the U groove 22 when the screw shaft 3 is rotated 90 degrees around the axis. The locking portion 25 is attached to the lower end of the screw shaft 3 by a bolt 26. The bolt 26 is a protective bolt and has a small-diameter portion 27 formed so that the slide lock device 1 can be protected by breaking when a large load is applied when the slide 20 is erroneously operated during processing.
[0015]
The nut member 4 is supported by the main body frame 2 via a tubular member 7 described later, and is screwed to the screw shaft 3. The nut member 4 is provided with a radial bearing 28 between the upper part of the cylindrical member 7 and the needle bearing 30 between the nut member 4 and the frame member 15. It is freely rotatable.
[0016]
The rotation restricting mechanism 5 has a linear rotation restricting groove 31 formed along the screw portion 24 of the screw shaft 3, and a turning groove 32 formed spirally within a range of 90 degrees around the axis following the upper end thereof. . The screw shaft 3 is disposed so as to be inserted into the main body frame 2, and the rotation restricting groove 31 and the turning groove 32 are engaged with a pin 33 protruding inside the frame member 13. As a result, the screw shaft 3 is at a rotational position where the locking portion 25 passes through the U groove 22 in a lowered state. When the screw shaft 3 is slightly raised, the screw shaft 3 is guided by the rotation groove 32 to turn 90 degrees, and the locking portion 25 is moved to the U-shape. The rotation position reaches the rotation position where it is engaged with the groove 22, and when it rises further, it rises in a state where it is not rotated by being restricted by the rotation regulating groove 31.
[0017]
The rotation driving means 6 is for rotationally driving the nut member 4 and comprises an electric motor 34 capable of normal and reverse rotation, a driving gear 35 of a reduction gear train, an intermediate gear 36, and a driven gear 37, and the driven gear 37 is a nut. It is fixed to the upper end of the member. The rotation of the electric motor 34 drives the nut member 4 to rotate in the forward or reverse direction.
The cylindrical member 7 is provided between the nut member 4 and the frame member 15, has a receiving step 39 abutting on a step 38 of the nut member 4 from below, and when the nut member 4 is lowered. When the cylindrical member 7 is lifted, the steps are pressed against each other. The outer periphery of the cylindrical member 7 is fitted with the inner periphery of the frame member 15, and a small diameter portion 27 is formed at the lower end to form a step forming the lower surface 40, and the small diameter portion 27 is inserted into the inner hole of the frame member 16. The lower surface 40 and the upper end surface of the frame member 16 face each other. The cylindrical member 7 can be moved up and down a predetermined small distance with respect to the frame members 15 and 16.
[0018]
The hydraulic cylinder 8 includes a cylindrical member 7 and frame members 15 and 16, and a hydraulic chamber 41 is provided between a lower surface 40 of the cylindrical member 7 and an upper end surface of the frame member 16. The side has a piston shape that moves up and down. A passage 42 for supplying pressure oil to the hydraulic chamber 41 is formed in the frame member 16.
[0019]
The urging member 9 has several recesses in the circumferential direction between the lower surface 40 of the tubular member 7 and the upper end surface of the frame member 16 on one surface thereof, for example, on the upper end surface of the frame member 16. Disposedly provided, a coil spring is installed in each of the recesses, a spring is urged to push up the cylindrical member 7, and another recess is provided between the recesses, and a piston type shock absorber is installed. The return spring is provided so as to additionally act on the pushing-up action of the coil spring, and exerts a cushioning action when the coil spring and the return spring are compressed. That is, as shown in an enlarged cross section in FIG. 2C, the shock absorber 60 is provided with a piston portion 63 having a check valve 62 in the recess 61 and a return spring 64 for projecting the piston portion 63 upward in the drawing. When the piston portion 63 is pushed down, the oil in the concave portion 61 leaks out from the gap on the outer periphery of the piston so as to buffer the oil. In FIGS. 1 and 2, reference numeral 43 denotes a proximity switch for detecting the lower limit position of the locking portion, reference numeral 44 denotes a proximity switch for detecting the locking position of the locking portion, and reference numeral 45 denotes a limit switch for detecting the slide lock.
[0020]
The pump 10 is a pneumatically driven hydraulic pump, and is provided on the main body frame 2 together with pump control devices, for example, an air regulator 47 and an air solenoid valve 48, as shown in FIGS. The oil tank 11 is formed between the tubular member 7 and the frame member 15 by cutting a part of the outer periphery of the tubular member 7 in an annular shape. The switching valve 12 is a pilot air type hydraulic switching valve and has a shutoff position and a communication position. These hydraulic circuits are as shown in FIG. That is, the supply port of the air solenoid valve 48 is connected to the pump 10 via the air regulator 47, the supply / discharge port 50 of the air solenoid valve 48 is connected to the pilot port 51 of the switching valve 12, and the discharge port of the pump 10 is connected to the passage. The suction port 53 of the pump 10 is connected to the oil tank 11 via the passage 54, and the middle of the passage 52 is connected to the middle of the passage 54 via the switching valve 12. . In the figure, 55 is a hydraulic pressure switch.
[0021]
In order to lock the slide 20 by the slide lock device 1 configured as described above, the switching valve 12 is set to the communication position, the nut member 4 is rotationally driven by the rotation driving means 6, and the screw shaft 3 is driven upward. Since the cylindrical member 7 and the nut member 4 are urged upward by the plurality of urging members 9, the screw shaft 3 is driven to rise while floating above the main body frame 2 by a predetermined small distance. When the screw shaft 3 rises and the locking portion 25 at the lower end thereof abuts against the lower surface of the slide 20, the screw member 3 does not rise and the nut member 4 rotates. The member 7 and the nut member 4 are pulled downward, and the floating state is reduced. The floating state is alleviated by the presence of the shock absorber 60 without impact. At this time, the hydraulic pressure in the hydraulic chamber 41 of the hydraulic cylinder 8 is released to the oil tank 11 through the passage 52 and the passage having the switching valve 12, and the cylindrical member 7 and the nut member 4 and the ascending drive of the screw shaft 3 is stopped, and the drive of the rotary drive means 6 is stopped based on a detection signal from the slide lock detection limit switch 45. Then, the switching valve 12 is switched to the shut-off position, the pump is operated to supply oil to the hydraulic chamber 41 of the hydraulic cylinder 8, the cylindrical member 7 is displaced upward, and the nut member 4, the screw shaft 3, the locking portion 25 , The slide 20 is positively lifted in the direction in which the slide 20 is positively lifted, and the lock is completed when the tightening force is equal to or slightly larger than the mass of the slide + the mass of the mold. Since the slide 20 is positively tightened with the force of the slide mass + the mold mass or a slightly larger eye force, even if the slide 20 falls, no impact force is generated.
[0022]
【The invention's effect】
The invention described in claim 1 has an effect that no impact force is generated even if the slide falls because the slide is positively tightened with the force of the slide mass + the mold mass or a slightly larger eye force. .
According to the second aspect of the present invention, the number of pipes and wires between the press machine and the slide lock device is reduced, the length of the pipes and wires is reduced, the number of maintenance and inspection points is reduced, and the installation work is easy. Thus, there is an effect that the cost can be reduced during the installation work.
The invention described in claim 3 has an effect that an arbitrary discharge oil pressure can be easily obtained, and the tightening force of the slide can be easily adjusted according to the slide mass of the press machine + the mold mass.
The invention described in claim 4 has an effect that the slide lock device can be reduced in size and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional front view showing an embodiment of the present invention.
2A is a schematic side view of the same embodiment with a part omitted, FIG. 2B is an enlarged longitudinal sectional view of a portion around a shock absorber, and FIG. 2C is an enlarged view of a shock absorber portion of FIG.
3A and 3B show a hydraulic circuit diagram of the embodiment, wherein FIG. 3A shows a locked state, and FIG. 3B shows an unlocked state.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 slide lock device 2 main body frame 3 screw shaft 4 nut member 5 rotation restricting mechanism 6 rotation driving means 7 cylindrical member 8 hydraulic cylinder 9 biasing member 10 pump 11 oil tank 12 switching valve 13 to 17 frame member 18 press body 19 crown DESCRIPTION OF SYMBOLS 20 Slide 21 Projection part 22 U groove 23 Retaining part 24 Screw part 25 Locking part 26 Bolt 27 Small diameter part 28 Radial bearing 30 Needle bearing 31 Rotation regulating groove 32 Rotating groove 33 Pin 34 Electric motor 35 Drive gear 36 Intermediate gear 37 Followed gear 38 Step 39 Receiving step 40 Lower surface 41 Hydraulic chamber 42 Passage 43 Locking unit lower limit position detection proximity switch 44 Locking unit lock position detection proximity switch 45 Slide lock detection limit switch 46 Liquid level gauge 47 Air regulator 48 Air solenoid valve 50 Supply / discharge port 51 Pilot port DOO 52 passage 53 suction port 54 passage 55 hydraulic pressure switch 60 dampener 61 recess 62 a check valve 63 the piston unit 64 return spring

Claims (4)

A main body frame of a slide lock device fixed to the press main body side, a screw shaft disposed in a state of being inserted into the main body frame, extending vertically, and having a locking portion at a lower end portion capable of locking the slide from below, A nut member rotatably supported by the main body frame and screwed to the screw shaft, a rotation restricting mechanism for restricting rotation of the screw shaft, a rotation driving means for driving the nut member to rotate, and the nut member A cylindrical member for supporting the nut member so as to be able to ascend and descend a predetermined small distance via a receiving step portion which is fitted to the step portion of the nut member from below so as to be rotatably rotatable, and A hydraulic cylinder having a hydraulic chamber formed with a hole and a piston portion and subjected to a compressive action by a downward displacement of the cylindrical member; and A plurality of biasing members for elastically biasing the body frame upward, wherein a slide lock device for a press machine that locks a slide to a main body of the press machine and regulates a downward movement of the slide. A pump and an oil tank for supplying pressurized oil to the hydraulic chamber, and a passage provided between the hydraulic chamber and the pump and connected to the oil tank, the slide position being locked when the slide is locked, and the communication position being released when the lock is released. And a switching valve for a press machine. The slide lock device for a press machine according to claim 1, wherein the pump and the pump control device are provided on a main body frame. The slide lock device for a press machine according to claim 1 or 2, wherein the power source of the pump uses compressed air, and is a pneumatically driven hydraulic pump. 4. The slide lock device for a press machine according to claim 1, wherein an oil tank is formed between the main body frame and the cylindrical member, and the oil tank is also used as the cylindrical member and the tank.

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