JP2561916Y2 - Two-axis mixer - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial applications] The present invention is applied to gravel, sand, cement,
The present invention relates to a biaxial mixer for mixing ready-mixed concrete by mixing water and an admixture.

[0002]

2. Description of the Related Art In a conventional two-axis mixer, two parallel kneading shafts rotating in opposite directions are arranged in a kneading tank, and a number of arms are fixed radially to the kneading shaft, and a tip end of the arm is provided. The kneading blades are attached to the kneader, and the kneading shaft is rotated in a reciprocal direction by a driving motor to move the materials with the kneading blades to knead the materials.

[0003]

[Problems to be Solved by the Invention] In order to produce high-quality ready-mixed concrete, it is desired that cement shells be uniformly formed around the kneading materials such as gravel and sand. The axial mixer has a structure in which the kneading blades rotate at a substantially constant speed in a certain direction, and therefore, the materials move in the same direction in a state where the relative speed between the various materials due to the rotation of the kneading blades is equal. Therefore, when each material moves at the same speed in the same direction between the various materials, there is little chance of cement entering between the gravel and sand, so it is enough to form a uniform cement crust around the gravel and sand. It takes a long time to knead.

In view of the above, the present invention is not limited to simply moving a material by means of a kneading blade, but to effectively mixing materials by causing a difference in the moving speed between various materials by the kneading blade. It is an object of the present invention to provide a two-shaft mixer devised as described above.

[0005]

According to the present invention, in order to achieve the above object, two kinds of parallel kneading shafts arranged in a kneading tank are rotated in opposite directions by a driving motor to separate various materials. In a kneading two-shaft mixer, a sprocket that is rotationally driven by a drive motor is loosely fitted to a kneading shaft,
A vibration transmitting arm is fixed to the shaft end of the kneading shaft in the radial direction,
The vibration transmitting arm and the sprocket are connected via an elastic body, and the vibration transmitting arm is provided with a vibrator for applying vibration in the circumferential direction of the kneading shaft.

[0006]

According to the present invention, when the drive motor is driven to rotate the sprocket loosely fitted to the kneading shaft, the sprocket pushes the vibration transmitting arm fixed to the kneading shaft via the elastic body. To rotate the kneading shaft. At this time,
The vibrator attached to the vibration transmitting arm is driven to generate vibration in the circumferential direction of the kneading shaft. Thereby, the vibration is transmitted to the kneading shaft via the vibration transmitting arm, and the kneading blade attached to the kneading shaft rotates while vibrating in the circumferential direction. At this time, the elastic body interposed between the vibration transmitting arm and the sprocket expands and contracts with the vibration to increase the amplitude of the vibration and absorb the adverse effect on the drive transmission mechanism due to the vibration. The vibration of the kneading blades causes the kneading material to be hit, thereby changing the moving speed of the kneading material, and increasing the opportunity for cement to enter between the gravel and sand.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a biaxial mixer for kneading materials such as gravel, sand, cement, water and an admixture to produce ready-mixed concrete. A kneading tank 2 has two parallel kneading shafts 3 and 3 '. And is rotatably supported by a bearing 4 fixed to the kneading tank 2. A large number of arms 5 are radially arranged on the kneading shafts 3 and 3 'in the radial direction, and kneading blades 6 having an appropriate angle are attached to the tip of the arms 5. Kneading shaft 3, 3 '
Gears 7 and 7 'are attached to and meshed with one end of the shaft, and the kneading shafts 3 and 3' are rotated at a synchronous speed.

At the other end of the kneading shafts 3, 3 ', sprockets 8, 8' as a rotation transmission mechanism are mounted in a loosely fitted state without being fixed to the kneading shafts 3, 3 '. Driving motors 9 and 9 'are disposed on the sides of the sprockets 8 and 8', and the sprockets 10 and 10 'attached to the driving motors 9 and 9' and the sprockets 8 and 8 'are chained. The sprockets 8, 8 'are rotated by drive motors 9, 9' which are connected by 11, 11 '.

An elastic member 12 is fixed to the outer surfaces of the sprockets 8 and 8 '.
Move the arm 1 for vibration transmission to the kneading shafts 3 and 3 '
3 is fixed in the radial direction of the shaft. Then, the elastic body 14, for example, a plurality of disc springs, is sandwiched between the vibration transmitting arm 13 and the elastic body mounting bracket 12 fixed to the sprockets 8 and 8 ′ so as to expand and contract in the rotation direction of the vibration transmitting arm 13 and vibrate. The transmission arm 13 and the sprockets 8, 8 'are connected.

A piston-type vibrator 15 for generating vibration by reciprocating movement of a piston is attached to the tip of the vibration transmitting arm 13. This piston type vibrator 15 makes its vibration direction coincide with the circumferential direction of the kneading shafts 3, 3, that is, the tangential direction of a virtual circle centered on the kneading shafts 3, 3 '.

Reference numeral 16 denotes a rotary joint for supplying compressed air to a piston type vibrator 15 which rotates together with the kneading shafts 3 and 3 '. It is fixed to the support frame 17 attached to the kneading tank 2 so as to match. One side of the rotary joint 16 is connected to the piston type vibrator 15 by an air pipe 18, and the other side is connected to a driving air source (not shown) by an air pipe 19.

When the fresh concrete is kneaded by the two-axis mixer 1, the drive motors 9, 9 'are driven to rotate the sprockets 8, 8'. The sprockets 8, 8 'rotate the vibration transmitting arm 13 via the elastic body 14 to rotate the kneading shafts 3, 3'. Then, a predetermined amount of gravel, sand, cement, water, and an admixture are sequentially charged into the kneading tank 2 to start kneading. During kneading, compressed air for driving is supplied to the piston vibrator 15 to vibrate the piston vibrator 15. This vibration is transmitted by the vibration transmission arm 1
It is transmitted to the kneading shafts 3 and 3 'through 3 and vibrates the kneading shafts 3 and 3' in the circumferential direction. At this time, the elastic body 14 interposed between the sprockets 8 and 8 'and the vibration transmitting arm 13 expands and contracts with the vibration of the vibration transmitting arm 13 to increase the amplitude of the vibration and the sprockets 8 and 8'. It absorbs the adverse effects of vibration on the drive transmission mechanism. When the kneading shafts 3, 3 'are vibrated in the circumferential direction, the vibrations are transmitted to the kneading blades 6 via the arms 5 attached to the kneading shafts 3, 3'. As a result, the kneading blades 6 rotate while vibrating, giving vibrations to the kneading materials to change the moving speed of each material, thereby increasing opportunities for cement to enter between gravel and sand. Can be mixed efficiently,
High quality ready-mixed concrete can be manufactured.

Although the piston type vibrator 15 is used as the vibrator, a small rotary type vibrator which generates vibration by rotation of a roller or a ball may be employed instead of the piston type vibrator. At the time of adoption, it is designed to give a vibration in the radial direction of the kneading shafts 3 and 3 'so as not to cause mechanical damage. For example, two rotary vibrators are attached to cancel the vibrations in the radial direction of the kneading shaft. It is preferable to take measures such as applying vibration only in the circumferential direction of the shafts 3 and 3 '. Further, an electric vibrator can be employed instead of the pneumatic vibrator.

Further, the elastic member 14 is appropriately determined to have an optimum elastic force by conducting a mixer kneading test. In the embodiment, the elastic member 14 is interposed only at one position to vibrate the sprockets 8 and 8 '. Although the transmission arm 13 is connected to the transmission arm 13, the transmission arm 13 may be connected to the transmission arm 13 by interposing an elastic body at a plurality of positions. Needless to say, the present invention can also be applied to a single-shaft or multi-axis mixer. No.

[0016]

As described above, according to the present invention, the sprockets 8, 8 'for transmitting the rotational force loosely fitted to the kneading shafts 3, 3' and the vibration transmitting arm fixed to the kneading shafts 3, 3 '. 13 are connected via an elastic body 14, and a piston type vibrator 15 is attached to the vibration transmitting arm 13 to vibrate the kneading shafts 3, 3 'in the circumferential direction, thereby rotating the kneading blades 6 while vibrating. The kneading material is kneaded by hitting the kneading material, so that the vibration does not adversely affect the rotation transmission mechanism of the sprockets 8 and 8 ', and changes the moving speed and the moving direction of each kneading material, causing gravel and sand. The cement can be sufficiently introduced into the gap to form a uniform cement shell around the gravel and sand, and high-quality ready-mixed concrete can be manufactured.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Biaxial mixer 3, 3 '... Kneading shaft 6 ... Kneading blade 8, 8' ... Sprocket 13 ... Vibration transmission arm 14 ... Elastic body 15 ... Piston type vibrator 16 ... Rotary joint 18, 19 ... Air piping

Claims (1)

(57) [Scope of request for utility model registration] 1. A sprocket driven by a driving motor in a two-axis mixer for kneading various materials by rotating two parallel kneading shafts disposed in a kneading tank in opposite directions by a driving motor. Is loosely fitted on the kneading shaft, while a vibration transmitting arm is radially fixed to the shaft end of the kneading shaft, and the vibration transmitting arm and the sprocket are connected via an elastic body. A two-axis mixer equipped with a vibrator for applying vibration in a circumferential direction of a kneading shaft.