JPH04759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a screw press used for forging metals and forming ceramics, and particularly relates to a screw shaft drive device.

(Prior Art) As a device for transmitting driving force via frictional force in a conventional screw press, a device having a structure shown in FIG. 2 is widely used. A screw shaft 22 is installed vertically through a screw nut 23 fixed to a frame 24, and a friction member such as a leather belt is attached to the upper end of the screw shaft 22.
A flywheel 21 is fixed thereto, and an upper mold 25 is fixed to the lower end thereof. A drive shaft 27 is horizontally provided above the screw shaft 22 and extends orthogonally to the screw shaft 22, and friction wheels 20, 2 are placed on both sides of the drive shaft 27 at positions spaced apart from the flywheel 21 at a constant distance.
0' is fixed. This drive shaft 27 is held in a structure that allows it to be shifted left and right.
Friction wheel 2 by shifting to the right or left
0 or 20' contacts the outer periphery of the flywheel 21 and transmits rotational force through frictional force. In this case, since the friction wheels 20 and 20' always rotate in the same direction, the rotation of the screw shaft 23 can be reversed by contact with either 20 or 20', and the upper mold 25 at the lower end can be moved up and down. You can. It goes without saying that a lower mold 26 is fixed to the frame 24 below the upper mold 25.

(Problem to be solved by the invention) In the friction drive system as described above, the friction wheel 2
Contact between the friction wheels 20 and 20' and the flywheel 21 is made at only one point, and it is necessary to press the friction wheels 20 and 20' strongly against the outer periphery of the flywheel 21 in order to obtain the required friction torque. This causes the following problems.

(1) When the friction wheels 20, 20' contact the flywheel 21, sliding friction initially occurs, so the friction member 28 partially rubs and has a short life.

(2) Friction wheel 2 to increase frictional force
0 and 20' strongly against the flywheel 21, a lateral force on the screw shaft 22, that is, a force in the direction of bending the screw shaft 22, increases, causing the screw shaft 22 and the screw nut 23 to
Friction loss is large and life is shortened.

(3) The vertical stroke of the flywheel 21 is limited to less than the radius of the friction wheels 20, 20'.

(4) Since the friction wheels 20 and 20' rotate at a constant speed, the flywheel 21 and screw shaft 2
The rotational speed of the screw shaft 22 differs depending on the position of the screw shaft 22.

(5) Friction wheels 20 and 20', which store about 10 times the energy consumed in one operation, are constantly rotating at the top of the press equipment, and if the supports are damaged, it could lead to a major accident. .

The present invention aims to solve the above-mentioned problems and provide a safe and long-life friction drive device.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention constantly contacts the outer peripheral surface of the flywheel 5 fixed to the screw shaft 7 and has an axis parallel to the screw shaft 7. a plurality of hydraulic motors 1 which drive each of these drive rollers 2 independently and which can rotate in forward and reverse directions and rotate in the same direction all at once; A plurality of disc brakes 3 are provided, and the flywheel 5 is rotated by the frictional force between the outer circumferential surface of the drive roller 2 and the outer circumferential surface of the flywheel 5, and the screw shaft 7 is moved up and down. This is a friction roller drive device for a screw press.

(Function) As described above, the flywheel 5 is always in contact with a plurality of drive rollers 2, and is screwed into the screw nut 8 by forward and reverse rotation of the drive rollers 2 driven by the hydraulic motor 1. The screw shaft 7 moves up and down.

(Example) FIG. 1 is a sectional view of a drive device of the present invention. A flywheel 5 with a friction member 6 such as leather wrapped around it is fixed to the upper end of a screw shaft 7 which is screwed into a screw nut 8 fixed to a frame 12 and is provided vertically. A crosshead 9 is rotatably provided at the lower end, and an upper mold 10 is further provided at the lower end. At a position in contact with the outer peripheral surface of the flywheel 5,
A plurality of drive rollers 2 having axes parallel to the axis of the screw shaft 7 are provided by bearings 4 arranged above and below. The drive rollers 2 are arranged at equal intervals, and a disc brake 3 is provided above each drive roller. Furthermore, a hydraulic motor 1 is provided at the upper end for driving, and the structure is such that each drive roller 2 is driven individually.

It goes without saying that the lower mold 11 is fixed to the frame 12 on the lower side opposite to the upper mold 10.

Next, the driving operation of the screw press of the present invention will be explained. When the oil motor 1 is rotated by pressurized oil from a hydraulic system (not shown), a coaxially connected drive roller 2 is rotated. This rotational force is transmitted to the flywheel 5 whose outer peripheries are in contact with each other. The rotational force transmitted to the flywheel 5 is directly transmitted to the screw shaft 7. On the other hand, since the screw shaft 7 is screwed into a screw nut 8 fixed to the frame 12, the rotation of the screw shaft 7 results in vertical movement with respect to the frame 12.

Since the hydraulic motor 1 is capable of forward and reverse rotation, the drive roller 2, flywheel 5, screw shaft 7
The hydraulic motor 1 can also be rotated in either the forward or reverse direction by switching the hydraulic motor 1 between forward and reverse directions. Moreover, since an emergency stop is possible with the disc brake 3, vertical movement of the screw shaft 7 due to inertia can be prevented.

Furthermore, if a large rotational force is required, this can be easily solved by increasing the number of hydraulic motors 1 and drive rollers 2.

Furthermore, if a long stroke is required, a sufficient stroke can be obtained by lengthening the drive roller 2.

(Effects of the Invention) Since the present invention has the above-described structure, it has the following effects.

(1) Forging energy can be increased by lengthening the drive roller 2 and increasing the rotation speed of the hydraulic motor 1.

(2) To increase the driving force, use hydraulic motor 1
Not only can this be easily achieved by increasing the number of drive rollers 2, but even if the pressing force of the drive rollers 2 is increased to increase the frictional force, the bending force is not applied to the screw shaft 7. I can't get enough of it.

(3) Conventional high-speed rotating friction wheel 20,
20' is not used, and the drive roller 2 is arranged around the flywheel 5, so even if this part should be damaged, there is no risk that the flywheel, which has high energy, will fall.

(4) Since the drive roller 2 and the flywheel 5 are in constant contact, there is no abnormal slippage at the start of rotation or at the time of reverse rotation, and the life of the friction member 6 is long.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a screw press drive device of the present invention, and FIG. 2 is a partial sectional view of a conventional screw press drive device. 2: Drive roller, 5: Flywheel, 7: Screw shaft.

Claims (1)

[Claims] 1. In a screw press, a plurality of drive rollers that are in constant contact with the outer peripheral surface of a flywheel fixed to a screw shaft and have an axis parallel to the screw shaft, and each of these drive rollers is independently driven, and A plurality of hydraulic motors capable of forward and reverse rotation and rotating simultaneously in the same direction, and a plurality of disc brakes respectively provided on the plurality of drive rollers are provided, and the outer circumferential surface of the drive roller and the outer circumferential surface of the flywheel are connected to each other. A friction drive device for a screw press, characterized in that the flywheel is rotated by frictional force to move the screw shaft up and down.