JPH0648864U - Vibration table for concrete block molding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vibration table for a concrete block molding machine, which can improve the molding cycle and can uniformly and densely fill the concrete material. [Structure] 2 on the back of the table body 1 by boring
The four main girders 2 forming the individual bearing housings 3 are provided in parallel with each other at substantially equal intervals, and the bearings 4 are attached to the respective bearing housings 3.
Put on. Rotation unit shafts 5 and 5a supported by two bearings 4 and 4 facing each other are provided, and the two rotation unit shafts 5 and 5a which are aligned are connected via a shaft joint 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration table for a concrete block molding machine.

[0002]

[Prior art]

 Conventionally, a vibration table for a concrete block molding machine has a structure in which two rotating shafts supported by two bearings are provided in parallel on the back surface of the table body, and an equivalent unbalanced weight is attached to each rotating shaft. Has become. The rotation of the rotary shaft is usually such that the rotation of the motor with a brake is transmitted to the rotary shaft via the belt transmission means, and the two rotary shafts in the pair rotate in opposite directions at the same speed. Then, the vibration force generated by the rotation of the unbalanced weight is applied to the table body and transmitted to the concrete material in the form through the table surface.

Depending on the type of block to be manufactured, it is the base layer concrete material that drives the above-mentioned electric motor and makes a brake to stop the rotation abruptly after a predetermined time elapses during one molding cycle of, for example, 30 seconds. It was performed three times during supply, during compression of base layer concrete material, and after surface layer concrete material was supplied (finishing) during compression molding, and each time the motor temperature rose due to heat generation due to transient current. When the electric motor is not driven (the vibration table is not vibrating), reciprocating movement of the feeding device, vertical movement of the press device, and unloading of the molded product, natural heat dissipation or forced cooling of the electric motor is performed. The temperature was lowered.

[0004]

[Problems to be solved by the device]

 In response to a request to shorten the concrete block molding cycle as much as possible and improve the molding capacity, in the configuration in which one rotating shaft is supported by two bearings and the support span is long as described above, The diameter of the rotating shaft must be increased in order to keep the deflection generated on the rotating shaft due to the centrifugal force due to rotation below a certain limit, which results in the inertia moment of the rotating body including the unbalanced weight and the pulley. Since it is also large, it is difficult to shorten the start time from the stopped state of the motor to the steady rotation and the break operation time at the time of stop, and also the heat generated by the motor due to the transient current is large. It was also difficult to shorten the time in terms of the allowable insulation temperature limit.

In addition, high-speed rotation of the rotating shaft is desired for high-density filling of concrete, but in a configuration in which one rotating shaft is supported by two bearings, the bearing load becomes large and the bearing can withstand this load. In order to achieve this, a bearing with a large bearing diameter had to be used, and the increase in rotation speed was restricted by the restriction on the peripheral speed of the bearing.

Also, in terms of the uniformity of the packing density of the concrete material in the formwork, the vibration force generated by the rotation of the unbalanced weight is transmitted to the vibration table through two bearings for each rotating shaft. As a result, the distribution of vibration on the table surface became uneven, and the packing density of the concrete material in the formwork tended to be uneven.

Furthermore, the fact that the braking time at the time of starting or stopping the motor is long means that the rotation of the pair of unbalanced weights is not synchronized in such a transitional state, and the vibration does not occur. Causes arrhythmia, which deteriorated the quality of the molded block.

An object of the present invention is to remedy the above-mentioned conventional drawbacks.

[0009]

[Means for Solving the Problems]

 The present invention relates to a vibration table for a concrete block molding machine in which a pair of rotating shafts, each having an equivalent unbalanced weight, are parallel to each other and rotatably arranged on the back surface of the table, and two bearing housings are provided by boring. The main girders that have been formed on the back of the table body are projected in parallel at four places at approximately equal intervals, bearings are mounted on each bearing housing, and rotary unit shafts supported by two facing bearings are provided respectively. The above-mentioned two rotation unit shafts on a straight line are connected to each other through a shaft joint.

[0010]

[Operation] The rotating shaft, which is composed of two rotating unit shafts connected by shaft joints, is supported by four bearings. Therefore, even if the rotating unit shaft has a small diameter, it has little deflection and can rotate at high speed. And A small diameter of the rotating unit shaft means a small moment of inertia of the rotating body including the unbalanced weight and the pulley.Therefore, shorten the motor start-up time and brake operation time to keep the motor temperature rise low. This makes it possible to shorten the molding process time, that is, improve the molding capacity.

Since the bearing housing is formed by boring in the main girder integrated with the table body, the vibration force due to the rotation of the unbalanced weight is efficiently transmitted to the table body. Moreover, the vibration force due to the rotation of the unbalanced weight is synchronously transmitted to the table surface from the main girders arranged at four locations on the back surface of the table at substantially equal intervals, so that the vibration distribution on the table surface is distributed. Uniform, resulting in a uniform packing density of concrete material in the formwork placed on the table top.

[0012]

【Example】

 FIG. 1 is a plan view of the vibration table according to the present invention as viewed from the back side. As is clear from FIG. 1, there are four main girders 2 provided on the back surface of the table body 1 in parallel with each other at substantially equal intervals, and each main girder 2 has a bearing housing 3 formed by boring. Two are provided for each main girder 2, and a bearing 4 is 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. Rotational unit shafts 5 and 5a are provided at the respective positions, and the two rotational unit shafts 5 and 5a are connected to each other via a shaft coupling 6. In other words, in the past, one rotating shaft was supported by two bearing points, but in the present invention, the number of bearing points is increased to four, and the rotating shaft also has two rotating unit shafts 5, 5a by the shaft joint 6. It is configured to be connected. Needless to say, the distance between the bearings is shorter than before. An unbalanced weight 7 is attached to each rotation unit shaft 5 and 5a, and a pulley 8 for transmitting rotation is attached to an end of one rotation unit shaft 5 so that the unbalanced weight 7 can be excited to rotate. Is the same as before. FIG. 4 shows the details of the unbalanced weight 7 which is divided into two for easy mounting. In the figure, 9 is a vibration-proof rubber.

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

[0014]

[Effect of device]

 The present invention having the above-described configuration can achieve the following effects.

Since the distance between the bearings is shortened, the diameter of the rotating unit shaft does not have to be thickened, and the moment of inertia of the rotating body is also reduced accordingly, so that the start-up time and the brake operating time are reduced. The molding cycle can be improved as a result of being able to shorten the length and keeping the heat generation of the electric motor low.

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

Since the bearing housing is formed by boring on the main girders arranged at four places on the back surface of the table body at substantially equal intervals, the vibration force due to the rotation of the unbalanced weight is efficiently applied to the table body and Transmitted evenly over.

[Brief description of drawings]

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

FIG. 2 is a side view of the vibration table shown in FIG. 1 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 a line AA.

FIG. 4 is a cross-sectional view showing details of the unbalanced weight shown in FIG.

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. A vibration table for a concrete block molding machine, comprising a pair of rotary shafts, each having an equivalent unbalanced weight attached thereto, parallel to each other and rotatably arranged on the back surface of the table. Four main girders forming a housing are provided on the back surface of the table main body in parallel with each other at substantially equal intervals, bearings are mounted on each bearing housing, and rotary unit shafts supported by two facing bearings are provided respectively. A vibration table for a concrete block molding machine, characterized in that the two rotary unit shafts that are aligned with each other are connected through a shaft joint.