JPS6124393Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a point of a slide portion that reduces fluctuations in the oil level of oil that lubricates an adjustment member for adjusting die height of a press machine.

Conventionally, the point of the sliding part of a press machine is provided between a connecting rod 1 connected to the rotating shaft of the press and a sliding part 2 of the press, as shown in FIG.
Many of them have a die height adjustment mechanism and an overload protector mechanism. The die height adjustment mechanism is provided in lubricating oil in a chamber kept oil-tight by a retainer 11, and when the worm 8 is rotated, the female screw 6, which rotates via the worm wheel 7, is raised and lowered by the screw of the adjuster screw 5. The die height is adjusted by doing this. When the female screw 6 is lowered significantly, a large empty space is created between the lower end of the adjuster screw 5 and the retainer 11, and the worm 8 at the top of the retainer 11 is created so that oil can escape there.
There was a drawback that the female thread 6 etc. ran out of oil. If an oil reservoir 18 is provided at the top of the screw guide 3 to prevent this, there are drawbacks such as the need to increase the distance between the crown of the press, where the rotating shaft and the like are provided, and the slide portion.

The purpose of the present invention is to eliminate these drawbacks and provide a point for the sliding part of a press machine that has a simple structure, can minimize oil level fluctuations, and does not require an oil reservoir. Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the upper end of the connecting rod 1 is rotatably connected to the rotating shaft of the press, and the lower end is rotatably connected by an adjuster screw 5 provided on the slide section 2 and a wrist pin 4. . The adjusting screw 5 is guided by the inner surface of the screw guide 3 fixed to the upper side of the slide portion 2 and is provided so as to be movable up and down, and its threaded portion 5a is screwed into a female thread 6. The female screw 6 is fitted into a hole of a worm wheel 7 provided on the inner periphery of the slide portion 2 so as to be rotatable and restrained in the axial direction, so as to be able to move up and down, and is restrained in the rotational direction by a key 9. The worm wheel 7 is engaged with a worm 8 rotatably provided on the slide portion 2. The lower end surface of the female screw 6 contacts the upper surface of the retainer 11, and the retainer 11 fits oil-tightly into the inner circumferential portion of the slide portion 2, and is provided to be movable up and down. The retainer 11 has a container shape with a concave portion in the center of the upper surface, and a hole in the center of the bottom to fit the outer diameter of the breathing tube 17 in an oil-tight manner. The lower surface of the retainer 11 is in contact with the upper surface of the piston 13. The piston 13 fits into a cylinder 12 fixed on the lower side following the inner circumference of the slide part 2, and is biased away from the bottom of the cylinder 12 by a spring 16. There is a step at the top of the cylinder 12, where the seal ring 14 is attached to the nut 1.
It is fixed at 5. The outer periphery of the seal ring 14 fits into the inner periphery of the cylinder 12 in an oil-tight manner.
Further, the lower surface of the seal ring 14 serves as a sealing surface, and is in close contact with a sealing surface provided around the upper surface of the piston 13. Port 12a in cylinder 12
When pressure oil adjusted to a required pressure is supplied from the piston 13, the piston 13 is pressed against the seal ring 14 in an oil-tight manner. When an overload is applied to the slide section 2 of the press, the force transmitted through the connecting rod 1 pushes down the piston 13 via the adjuster screw 5, female screw 6, and retainer 11, and the seal between the piston 13 and the seal ring 14 is broken. Separate the surfaces and connect the pressure oil to port 1.
2b to the oil tank to protect it from overload.
A plate 10 is oil-tightly fixed to the lower end surface of the threaded portion 5a of the adjuster screw 5, and the outer periphery of the plate 10 and the inner periphery of the retainer 11 are fitted in an oil-tight manner. Plate 10 and retainer 11
The upper cavity is filled with lubricating oil, which lubricates the threaded portion 5a, female thread 6, worm wheel 7, worm 8, and various parts around the wrist pin 4. Therefore, small diameter passages for lubricating oil are provided at necessary locations between these mechanical parts. A hole in the center of the piston 13 is provided in which the breathing tube 17 fits in an oil-tight manner.
Furthermore, the center of the cylinder 12 has a hole in which the breathing tube 17 fits in an oil-tight manner, and a flange portion 17a of the breathing tube 17.
Holes into which the holes fit are provided in stages. The aforementioned spring 16 biases between the cylinder 12 and the piston 13 via the flange portion 17a of the breathing tube 17. A breathing tube 17, which is oil-tight and movable up and down with respect to the cylinder 12, piston 13, and retainer 11, is connected to the cylinder 12 by a spring 16.
being pushed to the side. The breathing tube 17 is hollow;
A cavity formed by the plate 10 and the inner circumference of the retainer 11 is open to the atmosphere.

Next, we will discuss the effect. In FIG. 2, when the worm 8 is rotated and the worm wheel 7 is rotated, the female thread 6 is also rotated by the key 9. Since the female thread 6 is threadedly engaged with the threaded portion 5a of the adjusting screw 5, it moves up and down with respect to the adjusting screw 5. Now, when the female screw 6 in the position shown in the figure is lowered, the retainer 11 is lowered relative to the plate 10, the volume of the cavity formed by the plate 10 and the inner circumference of the retainer 11 is increased, and the breathing tube 17 is opened. Atmospheric air is inhaled through it. The lubricating oil present between the upper surface of the plate 10 and the inner peripheral portion of the retainer 11 is expelled to the outside, and the oil level of the lubricating oil in the upper oil chambers of the plate 10 and the retainer 11 rises, albeit slightly.
Unlike the conventional example, the lubricating oil level does not drop significantly. The functions of the retainer 11, piston 13, seal ring 14, etc. that constitute the overload protector mechanism are the same as in the prior art because the breathing tube 17 is provided to be able to move up and down relative to these parts.

As is clear from the above explanation, according to the present invention, there is extremely little fluctuation in the oil level in the upper oil chamber of the retainer.
When the female screw is lowered and the slide section is lowered, the oil level rises slightly, contrary to the conventional method, and there is no risk of running out of oil in any part, and there is no need to provide a separate oil pool, so the crown of the press and slide The practical effects and advantages are extremely large, such as there being no need to widen the distance between the parts.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional example, and FIG. 2 is a longitudinal sectional view of an embodiment. 1 is a connecting rod, 2 is a slide portion, 3 is a screw guide, 4 is a wrist pin, 5 is an adjuster screw, 5a is a threaded portion, 6 is a female thread, 7 is a worm wheel, 8 is a worm, 9 is a key, 10 is a plate, 11 is a retainer, 12 is a cylinder, 12a,
12b is a port, 13 is a piston, 14 is a seal ring, 15 is a nut, 16 is a spring, 17 is a breathing tube, 17a is a flange portion, and 18 is an oil reservoir.

Claims (1)

[Scope of utility model registration request] An adjusting screw is connected to the lower end of the connecting rod and is guided in a vertically movable manner by a screw guide fixed to the sliding portion, and a screw is screwed into the threaded portion of the adjusting screw. a screw, a worm wheel that is slidably coupled to the female screw in the axial direction and is rotatable relative to the slide portion; and a worm wheel that engages with the worm wheel and is rotatably supported by the slide portion. a worm; a retainer that receives the female screw from below;
The adjusting screw is attached to the lower end of the adjusting screw at a point in the sliding portion of the press machine, which has a hydraulic overload protector piston that receives the retainer from below and a cylinder that houses the piston. A vertically slidable and oil-tightly adapted plate is fixed to the inner circumferential side wall of the chamber in which the housing is housed, and a hollow breathing plate is provided through the retainer, piston and cylinder. A press machine, characterized in that a breathing tube is provided, the breathing tube is slidably and oil-tightly fitted to the retainer and piston, and the breathing tube is oil-tightly fitted and held to the cylinder. The point of the slide part.