JPH0230398A - Screw press - Google Patents

Abstract

PURPOSE:To reduce transmit torque loaded to a clutch by quantity of the reduction gear ratio by arranging planetary speed reducer at between a screw spindle and a fly-wheel and also hydraulic clutch at between the input shaft and the fly-wheel. CONSTITUTION:A motor 17 is driven and the fly-wheel 15 is rotated. Hydraulic oil is supplied in a cylinder 21 from a hydraulic oil unit through a rotary joint 24, and a clutch piston 21' is shifted to disk 20', 23' sides and mutually pressure- welded, and the fly-wheel 15 and the input shaft 14 are connected to rotate the input shaft 14. Rotation of the input shaft 14 is transmistted to a planetary gear 13 through a sun gear 14' to rotate a planetary carrier 11. Therefore, the screw spindle 3 is rotated and a sliding member 2 is descended through a female screw 4 to form under pressurizing the material to be worked. After completion of the forming work, the hydraulic oil is supplied into the oil hydraulic cylinder 6 to ascend a piston 7. By this method, even if the driving source and the fly-wheel are small size, the sufficient pressurized force can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a clutch-type screw press used for forging, etc., which makes it possible to minimize wear on clutch plates.

[Prior Art] Conventionally, general clutch-type screw presses are those in which a dry clutch plate is directly connected between the screw spindle and the flywheel, or those in which a dry clutch plate is directly connected between the screw spindle and the flywheel, or
As described in No. 1, it is known that a planetary reducer is interposed between a flywheel and a screw spindle, and a dry clutch is provided between a carrier or an inner gear of the planetary reducer and a casing.

[Problem to be solved by the invention] However, in the former case, the torque of the screw spindle required to obtain the pressurizing force of the press becomes the required torque of the clutch, and a dry clutch with a large coefficient of friction must be used. However, although dry clutches have a large coefficient of friction and a large transmission torque, they suffer from significant wear and require frequent lining replacement.

In the latter case, the torque applied to the screw spindle is made larger than the output torque from the flywheel by decelerating the speed using a planetary reducer, and the carrier or inner gear is selectively fixed by turning on and off the clutch. The friction force applied to the clutch is reduced as much as possible by transmitting it to the screw spindle via an inner gear or carrier, and a durable wet clutch plate is used, which reduces wear on the clutch plate. .

However, since the amount of reduction in the friction torque applied to the clutch is only reduced by the amount of flywheel torque, it is not possible to significantly reduce the friction torque applied to the clutch. However, it is necessary to make the clutch plate large in diameter, which still has the disadvantage of increasing costs and increasing the size of the device.

The present invention provides a wet clutch type screw press that greatly reduces the friction torque applied to the clutch plate without reducing the molding pressure of the press, minimizes wear of the clutch plate, and hardly requires replacement of the lining. It is intended to.

[Means for Solving the Problems] In order to achieve the above object, the screw press of the present invention transfers the rotational energy of a flywheel to the screw spindle via a clutch to form a product. A planetary reducer having an input shaft on the same axis as the screw spindle is provided between the planetary reducer and the flywheel, and a wet clutch is provided between the input shaft of the planetary reducer and the flywheel.

[Example] Hereinafter, an example of the present invention will be specifically described based on FIGS. 1 and 2.

1 is a main body frame of a screw press, and a slide member 2 is supported on the main body frame 1 so as to be slidable in the vertical direction. 3 is a screw spindle rotatably supported by a boss 5 fixed above the main body frame 1;
The screw 3' of the screw spindle 3 is threaded into a female thread 4 mounted on the slide member 2.

Reference numeral 6 denotes a hydraulic cylinder provided on the main body frame 1, in which the tip of a piston 7 is connected to an arm 8 fixed to the slide member 2, and the slide member 2 is moved upward by pressure oil from a hydraulic unit (not shown). It is designed to be moved.

Reference numeral 9 denotes a planetary gear reducer provided on the upper end side of the screw spindle 3. The planetary gear reducer 9 includes a gear box 10 provided at the upper end of the main body frame 1, and a planetary carrier fixed to the upper end of the screw spindle 3. 11, a planetary gear shaft 12 protruding from the upper surface of the carrier 11, a planetary gear 13 rotatably supported on the shaft 12 via a bearing, and a gear box coaxially with the screw spindle 3. 10
The input shaft 14 is rotatably supported through a bearing, and a sun gear 14' is fixed to the input shaft 14 and meshes with the planetary reducer 13.

Note that an inner gear 10' (internal sun gear) that meshes with the planetary gear 13 is formed inside the gear box 10.

A flywheel 15 is rotatably supported by the gear box 10 via a bearing, and a pulley 16 is attached to the flywheel 15. Reference numeral 17 denotes a motor attached to a mounting base 18 attached to the main body frame 1, and the drive of the motor 17 rotates the flywheel 15 via one belt.

A clutch housing 20 is attached to the upper part of the flywheel 15 and has an annular cylinder 21 formed inside.
A large number of discs 20' are spline-engaged with the inner circumferential surface of
and a large number of discs 23' spline-engaged with the outer peripheral surface of a clutch hub 23 fixed to the input shaft 14 are alternately housed. This is a multi-plate wet type system in which lubricating oil is supplied to the friction surfaces of the disks 20' and 23' to transmit torque via a fluid friction film.

24 is a rotary joint, which is provided in the clutch housing so as to be located on the same axis as the screw spindle. 21' is a clutch piston fitted into the cylinder 21 and provided above the discs 20' and 23', and the disc 20'23' is pressed.

29 is the clutch piston 21' and the clutch housing 2
A spring installed between the clutch piston 2 and the
1' is biased to move toward the opposite side of the disk.

In the above embodiment, an example was shown in which one stage of planetary gear reducer was provided between the input shaft 14 and the screw spindle 3, but if it is desired to increase the reduction ratio, for example, as shown in FIG. It is preferable to provide two or more stages of planetary gear reducers between the input shaft 14 and the screw spindle 3.

Next, the embodiment shown in FIG. 3 will be described.

The embodiment shown in FIG. 3 is basically the same as the embodiment shown in FIGS. 1.2, so only the differences will be explained.

25 is an intermediate shaft provided between the screw spindle 3 and the input shaft 14, and a sun gear 25 is provided at one end of the intermediate shaft 25.
' is formed, and the other end is fixed to the first stage planetary carrier 11.

Reference numeral 26 denotes a second-stage planetary carrier attached to the screw spindle 3, and a planetary gear shaft 27 is protruded from the upper surface of the carrier, and a second-stage planetary carrier 26 meshes with the sun gear 25' via a bearing on the shaft 27. A planetary gear 28 is rotatably supported. This planetary gear 28 meshes with an inner gear 10'' (internal sun gear) formed in the gear box 10. In the above embodiment, the planetary gear reducer uses gears as a planetary gear reducer. However, it goes without saying that the same effect can be applied to a known planetary roller speed reducer.

[When lowering the co-sliding member 2, first drive the motor 17, and its rotational force is transmitted to the flywheel 15 via the belt 19 and pulley 16, causing the flywheel 15 to rotate.

Next, pressure oil is supplied from a hydraulic unit (not shown) into the cylinder 21 through the rotary joint 24 to move the clutch piston 21' toward the disks 20' and 23'.

By this movement of the clutch piston 21', the disc 20' and the disc 23' are brought into pressure contact with each other, and the flywheel 15 and the input shaft 1 are connected to each other via the discs 20' and 23'.
4 is connected to rotate the input shaft 14. and,
This rotation of the input shaft 14 is transmitted to the planet gear 13 via the sun gear 14', causing the planet carrier 11 to rotate.

Therefore, the screw spindle 3 rotates.

By this rotation of the screw spindle 3, the slide member 2 is
descends and pressure-forms a workpiece (product) (not shown).

The descent of the slide member 2 upon completion of molding is stopped by detecting the stroke position of the slide member 2 using a limit switch or the like, and disengaging the clutch based on the detection signal to stop the rotation of the screw spindle 3.

When the slide member 2 is to be raised after the molding is completed, pressure oil from a hydraulic unit (not shown) is supplied to the hydraulic cylinder 6 to raise the piston 7. As the piston 7 rises, the slide member 2 rises via the arm 8, and one cycle ends when the slide member 2 reaches the upper end of its stroke.

[Effects of the Invention] According to the present invention, a planetary reducer is provided between the screw spindle and the flywheel, and the rotation of the flywheel is decelerated and transmitted to the screw spindle, so the drive source and the flywheel can be made smaller. Sufficient pressing force can be obtained even if the

Furthermore, a clutch is provided between the input shaft of the planetary reducer and the flywheel, so that the transmission torque applied to the clutch is smaller than the torque applied to the screw spindle by the reduction ratio. A multi-plate wet type clutch with reduced torque and less wear can be used, and a screw press that hardly requires replacing the clutch lining can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the screw press main body of the present invention, Fig. 2 is a large sectional view of area A in Fig. 1, and Fig. 3 is a partially enlarged sectional view of the planetary reducer of the second embodiment. It is a diagram. 1...Body frame 2...Slide member 3...Screw spindle 14...Drive gear shaft 15...Flywheel Fig. 2 Fig. 3

Claims (1)

[Claims] In a screw press that transfers the rotational energy of a flywheel to a screw spindle via a clutch to form a product, a planetary reducer has an input shaft between the screw spindle and the flywheel on the same axis as the screw spindle. 1. A screw press characterized in that a wet clutch is provided between an input shaft of the planetary reducer and a flywheel.