JPS631148B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that generates vibration in a mold for continuous casting by a stroke motion, and in particular, when an abnormal resistance occurs in the mold, the vibration of the stroke motion is increased in proportion to the resistance. The present invention relates to a mold vibrating device that can protect the components of the mold vibrating device and improve the operation of the mold at the same time.

During a casting operation, a lubricant is usually infiltrated between the mold and the molten steel, and the mold is generally vibrated up and down to prevent the molten steel from welding to the mold.

The power for this vibration is determined by the weight of the mechanical parts such as the mold and the frictional resistance between the mold and the molten steel or solidified shell.

Of this resistance force, the frictional resistance between the mold and the slab varies depending on various conditions in the slab, such as uneven amount of lubricant, deformation of the slab, etc., and this variation affects the quality of the product. This is undesirable, and efforts are being made to reduce this variation at operational sites.

Furthermore, by detecting (fluctuations in) the frictional force described above, it is possible to know abnormalities in operation, determine the amount and characteristics of the lubricant, and also be used as a means to stabilize operations.

A known method for detecting this frictional force (variation) is to attach a strain meter to a mold vibration mechanism, etc., and measure it.However, conventional mold vibration mechanisms are equipped with means to deal with fluctuations in frictional force. However, there are drawbacks such as the risk of equipment damage when abnormally large vibration resistance occurs.

The present invention can detect changes in resistance occurring within the mold during mold vibration as changes in the amount of compression of the vibration transmission shaft, and the vibration transmission shaft with a compression mechanism is connected to a drive source such as an electric motor or a mechanical structure such as a vibration table. The present invention provides a mold vibrating device that can also be used to protect.

That is, the present invention connects in series between a vibration table of a continuous casting mold and a drive source for the vibration table, an operating rod having one end fixed to the vibration table and a support cylinder having one end fixed to an eccentric cam of the drive source. A spring is provided close to the operating rod and the support cylinder, and the operating rod, the support cylinder, and the spring are integrally connected by a connecting rod, and the rotational movement of the electric motor of the drive source is controlled by the eccentric cam. The vibration table is vibrated by converting it into a stroke motion of an integrally connected body consisting of an operating rod, a support cylinder, and a spring, and an abnormal (i.e., excessive) resistance occurs in the mold, and this resistance is set in advance by the spring setting. When the reaction force is exceeded, the vibration stroke is reduced in proportion to the resistance, thereby reducing the vibration displacement to 0. At the same time, iron bars are installed at appropriate locations on the vibration table, and the iron bars are supported by brackets. The present invention relates to a mold vibrating device that can also measure the above-mentioned displacement amount by passing the coil through a fixed coil.

Hereinafter, the apparatus of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the configuration of the apparatus of the present invention.

In FIG. 1, the following mechanism is provided between the mold vibration table 1 and the drive source (electric motor 13, transmission 12) to reduce the vibration stroke to 0 if abnormally large resistance occurs in the mold. .

That is, an action rod 9 is provided on the vibration table 1 of the continuous casting mold via a pin 14, and the action rod 9 passes through the spring holder 2 and is fixed to the spring holder 2, and is further attached below the spring holder 2. It passes through the provided spring 6 and spring support seat 18 and is slidably fitted into the center hole of the upper seat 10' of the support tube 10.
This upper seat 10' is provided integrally with a support tube 10, and a spring 7 is provided in the support tube 10. A spring support seat 19 is provided above the spring 7 and between the lower surface of the upper seat 10'. Further, a spring holder 4 is provided below the spring 7 without being connected to the support cylinder 10, and the spring holder 4 and the spring holder 2 are connected to a connecting rod 5 which is provided through the upper seat 10' of the support cylinder 10. , 5' and nuts 8, 8'. Upper seat 1 of the support tube 10
A bracket 3 is provided at 0', and the bracket 3
A coil 17 is fixed to the coil 17, and an iron rod 16 fixed to the vibration table 1 is passed through the coil 17 to form a so-called differential transformer. Further, the support tube 10 is connected to an eccentric cam 11 provided on an output shaft 15 of a transmission 12 connected to an electric motor 13.

In the device of the present invention having the above configuration, while the mold is vibrating, if the vibration resistance is less than the set force of the springs 6 and 7, the mold may extend beyond the initial length,
Although they do not contract, when the resistance exceeds the set force of the springs 6, 7, the springs 6, 7 are compressed. This situation is schematically shown in FIG.

That is, if an abnormally large resistance occurs at some time from the neutral state shown in FIG. 1, and the mold is in the middle of rising, the eccentric cam 1
1, the support tube 10 moves upward, and the support tube 10
The spring pressers 2, 4, which are integrally connected to the upper seat 10' by the connecting rods 5, 5', move upward. Then, the action rod 9 penetrated and fixed to this spring holder 2
also moves upward, and the sliding portion of the operating rod 9 with the center hole of the upper seat 10' moves upward, causing the spring support seat 18 to move upward.
is pushed upward, the spring 6 is compressed upward, and the spring 7 is also compressed upward by the spring presser 4.

Also, if the mold is on the way down, the second
As shown in Figure B, the support cylinder 10 is moved downward by the eccentric cam 11, and the spring presser 2, which is integrally connected to the upper seat 10' of the support cylinder 10 by the connecting rods 5, 5',
4 moves downward. Then, the operating rod 9 that penetrates and is fixed to the spring retainer 2 also moves downward, and the sliding portion of the operating rod 9 that contacts the center hole of the upper seat 10' moves downward, causing the spring support seat 19 to move downward. When pressed down, the spring 7 is compressed downward, and the spring 6 is also compressed downward by the spring presser 2. When the springs 6 and 7 are compressed in this way, the vibration stroke of the driving source is not transmitted to the mold as it is, but is absorbed by the compression of the springs 6 and 7.

In this buffer mechanism, a force is applied to the springs 6, 7 in the compression direction when the mold is raised or lowered, and the set value can be changed by the amount of tightening of the nuts 8, 8'.

If the mold vibration resistance causes the springs 6 and 7 to be compressed beyond the set value, the differential transformer (coil 1
7, the iron rod 16) detects and records the amount. Since the spring constants of the springs 6 and 7 are known, the resistance force can be calculated by measuring the displacement.

As explained above, according to the device of the present invention, when abnormally large vibration resistance occurs in the mold, the buffer mechanism works to reduce the vibration stroke in proportion to the resistance, and before the output of the drive source reaches the upper limit. This has the advantage of not only mechanically protecting the vibration table but also eliminating the need to apply extra external force to the slab.
In addition, by measuring and recording changes in the vibration stroke, it is possible to detect the resistance inside the mold during casting operations, making it easy to obtain data related to operational improvements such as the amount, distribution, or characteristics of lubricant, or cooling conditions. can be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of the device of the present invention;
Figures A and B are schematic diagrams showing the operating mode of the device of the present invention. 1: Vibration table, 2, 4: Spring holder, 5,
5': Connecting rod, 6, 7: Spring, 9: Action rod, 1
0: Support tube, 10': Upper seat of support tube 10, 1
1: Eccentric cam, 13: Electric motor, 14: Pin, 1
6: Iron rod, 17: Coil, 18, 19: Spring support seat.

Claims (1)

[Claims] 1. A mold that converts the rotational motion of an electric motor into periodic stroke motion using an eccentric cam mechanism, and directly connects this to a vibration table of a continuous casting mold to vibrate the mold at a predetermined period and stroke. In the vibrating device, a support cylinder having one end fixed to the eccentric cam of the drive source and a support cylinder having one end fixed to the vibration table and the other end provided between the drive source of the vibration table and the vibration table are provided. An operating rod slidably fitted into a hole in the center of an upper seat provided at the end of the eccentric cam is connected in series, and springs are provided on the outer periphery of the operating rod and inside the support cylinder, respectively. A spring support seat is provided at each end of the upper seat side of the support cylinder of the spring, and a spring presser is provided at each end of the non-spring support seat side.
The spring holder on the action rod side is fixed by penetrating the action rod, the spring holder on the support cylinder side is not in contact with the support cylinder, and these spring holders and the upper seat of the support cylinder are integrated with a connecting rod. A shock absorbing mechanism is connected to the above-mentioned spring array to generate a certain reaction force, and an iron bar is fixed to the non-mold side end of the vibration table, and the iron bar is attached to the end of the support cylinder upper seat. A molded vibration device characterized by being provided with a differential transformer that is passed through a coil.