JP2579692Y2 - Vibration table for concrete block molding machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration table for a concrete block molding machine.

[0002]

2. Description of the Related Art Conventionally, a vibrating table for a concrete block molding machine is provided with two rotating shafts, one of which is supported by two bearings, on the back of the table body, and an unbalanced weight equivalent to each rotating shaft. It is configured to be mounted.
The rotation of the rotating shaft is usually performed by transmitting the rotation of a motor with a brake to the rotating shaft via belt transmission means, and rotating the pair of rotating shafts at the same speed in opposite directions to each other. The vibrating force generated by the rotation of the unbalanced weight is applied to the table body, and transmitted to the concrete material in the formwork through the table surface.

[0003] Depending on the type of block to be manufactured, the above-mentioned motor is driven within one molding cycle, for example, for 30 seconds, and the brake is operated after a predetermined time has elapsed to stop the rotation suddenly. The operation was performed three times during the compression of the base concrete material and during the compression molding after the surface concrete material was supplied (finished), and each time the motor temperature rose due to heat generation due to a transient current or the like. During the reciprocating motion of the feeding device, the raising and lowering motion of the press device, and the removal of the molded product during the reciprocation of the motor (the vibration table does not vibrate), the motor is naturally radiated or forcedly cooled to reduce the motor temperature. Dropped.

[0004]

[Problems to be Solved by the Invention] In response to a demand for shortening the molding cycle of a concrete block as much as possible and improving the molding ability, one rotating shaft is supported by two bearings as described above, and the supporting span is reduced. In a long configuration, the diameter of the rotating shaft must be increased to suppress the deflection generated on the rotating shaft by a centrifugal force caused by the rotation of the unbalanced weight below a certain limit, which includes the unbalanced weight and the pulley Since the moment of inertia of the rotating body is also large, it is difficult not only to shorten the start-up time from the stopped state of the motor to the steady rotation or the brake operation time at the stop, but also to generate heat of the motor due to transient current etc. Because of the large size, it was difficult to reduce the time even at the allowable temperature limit of insulation.

[0005] Further, for high-density concrete filling, it is desired to increase the speed of the rotating shaft. However, in a configuration in which one rotating shaft is supported by two bearings, the bearing load becomes large. Had to use a bearing with a large diameter, and the speed of rotation was limited by the limitation of the peripheral speed of the bearing.

In addition, in terms of the uniformity of the filling density of the concrete material in the formwork, the exciting force generated by the rotation of the unbalanced weight is transmitted to the vibration table via two bearings per one rotating shaft. Therefore, the distribution of vibration on the table surface becomes uneven, and the packing density of the concrete material in the formwork tends to be uneven.

Further, the long start-up time of the electric motor and the long brake operation time at the time of stoppage means that in such a transient state, the rotation of the unbalanced weights forming the pair is not synchronized, and the vibration is reduced. Because of arrhythmia, the quality of the molded block was degraded.

An object of the present invention is to improve the above-mentioned conventional disadvantages.

[0009]

SUMMARY OF THE INVENTION The present invention provides a vibration table for a concrete block molding machine in which a pair of rotating shafts each having an equivalent unbalanced weight mounted on the back surface of the table are parallel and freely rotatable. The main girder, which has two bearing housings formed by boring, is projected from the back of the table body at four locations at approximately equal intervals in parallel with each other, bearings are mounted on each bearing housing, and are supported by the two opposed bearings. The rotation unit shafts are provided respectively, and the two rotation unit shafts on a straight line are connected via a shaft joint.

[0010]

[Operation] A rotating shaft composed of two rotating unit shafts connected by a shaft joint is supported by four bearings. Therefore, even if the diameter of the rotating unit shaft is small, there is little deflection and high-speed rotation is possible. And The small diameter of the rotation unit shaft means that the inertia moment of the rotating body including the unbalanced weight and the pulley is small.Therefore, the startup time of the motor and the operation time of the brake should be shortened to keep the temperature rise of the motor low. And the molding process can be shortened, that is, the molding ability can be improved.

Since the bearing housing is formed by boring the main girder integral with the table body, the exciting force caused by the rotation of the unbalanced weight is efficiently transmitted to the table body. In addition, the excitation force due to the rotation of the unbalanced weight is synchronously transmitted to the table surface from the main girder, which is disposed at four places on the back of the table and at substantially equal intervals, so that the vibration distribution on the table surface is uniform. As a result, the packing density of the concrete material in the formwork placed on the table top surface becomes uniform.

[0012]

FIG. 1 is a plan view of a vibration table according to the present invention viewed from the back side. As is clear from FIG. 1, there are four main girders 2 projecting parallel to each other at substantially equal intervals on the back surface of the table body 1, and each main girder 2 has a bearing housing 3 formed by boring. Two main girders 2 are provided, and bearings 4 are mounted on each bearing housing 3 (see FIG. 3). Thus, there are a total of four places where the two bearings 4 and 4 face each other. Each unit has a rotation unit axis 5,5
a, and the two rotation unit shafts 5 and 5 a are connected via a shaft joint 6. In other words, conventionally, one rotating shaft has two rotating shafts.
In the present invention, the number of bearings was increased to four, and the number of rotating shafts was also two.
5 a is connected by a shaft joint 6. It goes without saying that the distance between the bearings is shorter than in the past. A point where an unbalanced weight 7 is attached to each of the rotation unit shafts 5 and 5a,
There is no difference from the prior art in that a pulley 8 for transmitting rotation is attached to the end of one of the rotation unit shafts 5 so that vibration can be applied by rotation of the unbalanced weight 7. FIG. 4 shows details of the unbalanced weight 7 divided into two parts for easy attachment. In the figure, reference numeral 9 denotes a rubber for vibration isolation.

In use, the rotational force of an electric motor (not shown) is transmitted by a pulley 8 via a belt (not shown), and the unbalanced weight 7 rotates to generate an exciting force.

[0014]

According to the present invention, the following effects can be obtained by adopting the above configuration.

By reducing the distance between the bearings, the diameter of the rotation unit shaft does not need to be increased, and the moment of inertia of the rotating body also decreases.
The brake operation time can be shortened, and the heat generation of the electric motor can be suppressed low, so that the molding cycle can be improved.

Since the number of bearings is increased, the bearing load and the bearing diameter are reduced, and the rotation speed can be increased, thereby enabling high-density concrete filling.

Since the bearing housing is formed by boring the main girder arranged at substantially equal intervals at four places on the back surface of the table body, the exciting force due to the rotation of the unbalanced weight is efficiently applied to the table body, and the entire surface of the table is covered. It is transmitted evenly.

[Brief description of the drawings]

FIG. 1 is a plan view of a vibration table according to the present invention as viewed from the back side.

FIG. 2 is a side view in which the vibration table of FIG. 1 is inverted and viewed from one side.

FIG. 3 is a cross-sectional view when the vibration table of FIG. 1 is inverted and cut along line AA.

FIG. 4 is a sectional view showing details of the unbalanced weight of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Table main body 2 Main girder 3 Bearing housing 4 Bearing 5, 5a Rotation unit shaft 6 Shaft joint 7 Unbalanced weight 8 Pulley

Claims (1)

(57) [Scope of request for utility model registration] 1. A vibration table for a concrete block molding machine in which a pair of rotating shafts each having an equivalent unbalanced weight mounted thereon are rotatably arranged on the back of the table in parallel with each other. The main girder forming the housing is provided on the back of the table main body at four locations at approximately equal intervals in parallel with each other, and a bearing is mounted on each bearing housing, and a rotating unit shaft supported by two opposed bearings is provided, respectively. A vibrating table for a concrete block molding machine, wherein the two rotating unit shafts on a straight line are connected via a shaft joint.