JPS6233097A - Screw press device - Google Patents

Abstract

PURPOSE:To execute forming with high accuracy by the exact control of impact punch force to be exerted to a pressure block by exerting thrust to an internal screw integrally provided with the pressure block by an actuator to rotating and driving a screw shaft. CONSTITUTION:The pressure block 3 is pushed downward by a rod 5 when an oil pressure is fed to the upper side of a cylinder 7 to push down a piston 6. Since the internal screw 9 is united to the pressure block 3, the screw 9 descends as well together with the block 3 to rotate a screw shaft 10. The rotating power of the shaft 10 is stored as inertia energy in a flywheel 14. This energy is instantaneously released and is exerted as impact force to a punch 4 when the top end of the punch 4 engages with a die. The speed and stroke length of the piston 6 are adjusted by controlling the oil pressure, by which the energy to be applied to the flywheel is exactly controlled and the forming is executed with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure molding device that utilizes the inertia of a flywheel.

[Technical Background and Prior Art] In recent years, higher-density molding has been required for firebrick molding. The present applicant has developed and proposed a hydraulic compound press that performs preliminary pressurization using a hydraulic cylinder, and a vacuum brick molded M having a soft skirt (Japanese Patent Publication No. 58-44054).

However, despite its high performance, conventional friction presses with flywheels and screw shafts have not been well-received.

This type of conventional 7-rection press is as shown in FIG. block 3
It is connected to 4.

The pressure block moves up and down along the guide rail,
A punch 32 attached to the lower end cooperates with a die 33 placed on the frame to form refractory bricks and the like.

A flywheel 35 is attached to the upper end of the screw shaft 31, and a leather belt 36 is attached to the outer periphery of the flywheel 35.
is wrapped. On the other hand, a pair of disc plates 39 are attached to a countershaft 38 driven by a motor 37, and an actuator 40 drives the countershaft 38 to bring the disc plates 39 into contact with the flywheel 35 alternately. This transmits forward and reverse rotation to the flywheel, causing the screw shaft to move up and down.

The conventional friction press described above has the following problems.

(1) The leather belt 36 is made of cowhide reinforced with nylon, but it is also difficult to maintain stable quality. Leather belts need to be inspected on a regular basis, as the leather may expand or contract due to changes in the climate, or if driven for long periods of time, the leather may deteriorate due to frictional heat and may break.

If a disconnection occurs while driving, the operator must stop the machine immediately and replace it, otherwise it will lead to a major accident, so the operator cannot be too careful even if the machine needs to be replaced once every 20 to 30 days. There was also a side. In addition, it is necessary to climb to the top of the press every day to inspect it before starting it and to tighten the leather belt, which takes extra time.

(2) From a mechanical point of view, since the countershaft 38 rotates above the flywheel 35, there is a risk of hitting the countershaft if the brake of the flywheel 35 is not sufficient.

(3) Since the forward and reverse rotation of the flywheel 35 relies solely on the frictional force between the skin and the disc plates 1 and 39, a time lag is unavoidable, and an extra idle stroke is required, so the time required for forming is long. In particular, recently, shortening the molding time is a key point in forming methods that require repeated pressurization 10 times or more.

(4) When operating continuously for 24 hours, a cooling down period is inevitably required due to the rise in skin temperature.

There were other problems.

When considering future machines that aim to operate unmanned, the more inspection points that must be checked with the human eye, the more unreliable the machine will be if there are even a few points that cannot be controlled numerically.

If the most important pressurizing mechanism can only be controlled in an uncertain manner, the need to improve it is a major issue.

In any case, there have been many attempts to create a new mechanism that eliminates the two rotating disc plates and the leather belt on the flywheel, but very few have been put into practical use.

[Object of the Invention] Therefore, an object of the present invention is to solve the above-mentioned conventional problems and to provide a screw press device in which an actuator applies thrust to a female screw provided integrally with a pressure block to rotationally drive a screw shaft. It is.

[Structure of the Invention] The screw brace device according to the present invention includes a screw shaft rotatably attached to a frame, a flywheel attached to the upper end of the screw shaft, a pressure block slidably attached to the frame, and a pressure block. It is equipped with an integrally attached female thread and an actuator that applies a thrust parallel to the axis of the screw shaft to the pressure block, and the vertical movement of the pressure block rotates the screw shaft that is threaded into the female thread.

[Operations and Effects of the Invention] As described above, the present invention is equipped with seven actuators such as hydraulic cylinders, and uses the thrust of the actuator to move the pressure block up and down, and also to drive the screw shaft through the female thread provided integrally with the pressure block. Since it is rotationally driven, by controlling the stroke, speed, etc. of the actuator, the impact punching force applied to the pressure block can be accurately controlled, and high precision and high density molding can be achieved.

[Example 1 The present invention will be described below with reference to the drawings.

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, in which a guide rail 2 is provided inside a frame 1 of the screw press device, and a pressure block 3 is provided inside the frame 1 of the screw press device.
to guide it in a sliding manner. A punch 4 is fixed to the lower surface of the pressure block 3, and performs pressure forming in cooperation with a die (not shown) provided at the lower part of the frame.

A pair of rods 5 are attached to the upper surface of the pressure block, and a piston 6 formed at the upper end of the rod 5 is inserted into a hydraulic cylinder 7. The hydraulic cylinder 7 has hydraulic pressure supply ports (not shown) at its upper and lower ends, and receives hydraulic pressure sent from a hydraulic control device to drive the piston 6 up and down.

A female screw holder 8 is attached to the upper part of the pressure block 3, and a female screw 9 is held inside the female screw holder 8. This female thread 9 is the screw shaft 10
The tip of the screw shirt]-10 enters into a recess 11 formed in the pressure block 3.

The screw shaft 10 is rotatably attached to the frame 1 by a thrust bearing 12 and a thrust bearing unit 13 at its upper part. Therefore, even if a vertical thrust is applied to the screw shaft 10, the screw shaft does not move in the axial direction, but only rotates.

A flywheel 14 is attached to the upper end of the screw shirt 1-10 and stores the energy of the rotational motion applied to the screw shaft. In addition, a cover 15 covering the female thread holder 8 is provided on the lower surface of the upper member of the frame 1.
is installed to prevent dirt and the like from entering between the female thread 9 and the screw shaft.

Next, the operation of this device will be explained.

The state shown in FIG. 1 shows the standby position, in which the punch 4 is pulled up from the die. In this state, the die is filled with material and preparation for processing is completed. Next, a hydraulic control device (not shown) is activated to send hydraulic pressure to the upper side of the cylinder 7 to press the piston downward.

As a result, the pressure block 3 is pushed down via the rod 5. Since the female screw 9 is integrated with the pressure block, the female screw also descends together with the pressure block and rotates the screw shaft. The rotational force of the screw shaft is stored as inertial energy in the flywheel 14, and when the tip of the punch 4 engages with the die, this energy is instantly released and applied to the punch as an impact force, resulting in high-density molding. can be achieved. After machining is completed, the hydraulic pressure is switched and sent to the bottom of the hydraulic cylinder, and the pressure block is pulled up and returned to the standby position.

By controlling the oil pressure, the speed and stroke amount of the piston 6 can be adjusted to accurately control the energy applied to the flywheel, so the energy required for pressure forming can be optimized and high precision forming processing can be achieved. It can be achieved.

[Summary] As described above, the present invention attaches the screw shaft to the frame side of the screw brace so as to be rotatable, and also attaches the female thread to the pressure block side so that the screw shaft and the flywheel provided at the upper end of the screw shaft are attached by vertical movement of the pressure block. Since only the flywheel protrudes from the top of the frame, all other members can be placed inside the frame, and the entire device can be made compact. In addition, all major movable parts are located below the frame, making maintenance and inspection easier.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, and FIG. 2 is a partially sectional front view showing a conventional friction press. 1...Frame 3...Pressure block
4... Punch 5... Rod 6... Piston
7...Cylinder 9...Female thread 10...
Screw shaft 12...Thrust bearing
13...Thrust bearing unit 14...Flywheel 15...Female thread cover Fig. 1 1L Fig. 2

Claims (1)

[Claims] A screw shaft rotatably attached to the frame,
A flywheel attached to the upper end of the screw shaft, a pressure block slidably attached to the frame,
It is characterized by comprising a female screw installed integrally with the pressure block and an actuator that applies a thrust force parallel to the axis of the screw shaft to the pressure block, and the vertical movement of the pressure block rotationally drives the screw shaft that is screwed into the female screw. A screw breath device.