JPH0541723U - Biaxial mixer - Google Patents

Abstract

(57) [Abstract] [Purpose] A high-quality ready-mixed concrete is manufactured by devising the method of rotating the kneading shaft of a twin-screw mixer to effectively mix the materials. [Structure] Sprockets 8 and 8'for transmitting a rotational force are loosely fitted to the kneading shafts 3 and 3'of the mixer, and are closely approached to the sprockets 8 and 8'and directed toward the kneading shafts 3 and 3'in the radial direction thereof. Then, the vibration transmitting arm 13 is fixed, and the sprockets 8 and 8'and the vibration transmitting arm 13 are coupled via an elastic body. Then, while vibrating the vibrator 15 attached to the vibration transmitting arm 13 to expand and contract the elastic body 14, vibration is applied in the circumferential direction of the kneading shafts 3 and 3 ', and the vibration is transmitted to the kneading blades 6 for kneading blades. Knead the material by rotating 6 while vibrating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a twin-screw mixer that mixes gravel, sand, cement, water, and an admixture to produce ready-mixed concrete.

[0002]

[Prior Art]

 In a conventional twin-screw mixer, two parallel kneading shafts that rotate in opposite directions are arranged in the kneading tank, a large number of arms are radially fixed to the kneading shaft, and a kneading blade is attached to the tip of the arm. The materials are kneaded by rotating the kneading shafts in opposite directions by a driving motor and moving the materials by kneading blades.

[0003]

[Problems to be solved by the device]

 In order to produce high-quality ready-mixed concrete, it is desirable that the crust of cement is uniformly formed around the gravel and sand that are kneading materials, but in the conventional twin-screw mixer, kneading is performed. Since the blades are structured to rotate at a constant speed in a certain direction, the kneading blades move in the same direction with the same relative speed between the various materials due to rotation. Therefore, if the moving speed of each material is the same and each material moves in the same direction, the chance of cement invading between the gravel and the sand is small, so that it is necessary to form a uniform cement shell around the gravel and sand. It is necessary to spend sufficient time to knead.

In view of the above points, the present invention effectively kneads materials not only by moving the materials by the kneading blades but also by making the moving speeds among various materials different by the kneading blades. The purpose is to provide a two-axis mixer devised in this way.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a twin-screw mixer for kneading various materials by rotating two parallel kneading shafts arranged in a kneading tank in opposite directions by a driving motor. While a sprocket rotationally driven by a drive motor is loosely fitted to the kneading shaft, 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. In addition to being connected, the vibration transmission arm is equipped with a vibrator that applies vibration in the circumferential direction of the kneading shaft.

[0006]

[Action]

 According to the present invention, when the driving 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 through the elastic body to knead the kneading. Rotate the shaft. At this time, the vibrator attached to the vibration transmission arm is driven to generate vibration in the circumferential direction of the kneading shaft. As a result, 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 sandwiched between the vibration transmission arm and the sprockets expands and contracts with the vibration, increasing the amplitude of the vibration and absorbing the adverse effect of the vibration on the drive transmission mechanism. This vibration of the kneading blade hits the kneading material, which changes the moving speed of the kneading material and increases the chances of causing cement to enter between gravel and sand.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a twin-screw mixer for kneading materials such as gravel, sand, cement, water, and an admixture to produce green concrete, and two parallel kneading shafts 3 and 3 are provided in a kneading tank 2. ′ 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 ', and a kneading blade 6 having an appropriate angle is attached to the tip of the arms 5. Gears 7 and 7'are attached to one ends of the kneading shafts 3 and 3'and meshed with each other so that the kneading shafts 3 and 3'are rotated at a synchronous speed.

Then, sprockets 8 and 8'as rotation transmission mechanisms are attached to the other ends of the kneading shafts 3 and 3'in a loosely fitted state without being fixed to the kneading shafts 3 and 3 '. Driving motors 9 and 9'are arranged 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 checked. The sprockets 8 and 8'are rotated by the drive motors 9 and 9 ', which are connected to each other by the gears 11 and 11'.

The elastic body mounting member 12 is fixed to the outer surface of the sprocket 8, 8 ', and the vibration transmitting arm 13 is directed toward the kneading shaft 3, 3'in the radial direction of the shaft so as to approach the sprocket 8, 8'. And sticks. 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 member 12 fixed to the sprockets 8 and 8'to expand and contract in the rotation direction of the vibration transmitting arm 13 and vibrate. The transmission arm 13 and the sprockets 8 and 8'are connected.

A piston type vibrator 15 that generates vibration by reciprocating motion of a piston is attached to a tip end portion of the vibration transmitting arm 13. The vibrating direction of the piston type vibrator 15 coincides with the circumferential direction of the kneading shafts 3, 3, that is, the tangential direction of an imaginary circle centered on the kneading shafts 3, 3 '.

Reference numeral 16 denotes a rotary joint that supplies compressed air to a piston type vibrator 15 that rotates together with the kneading shafts 3 and 3 ′. The rotary joint 16 has its rotation center as the axis of 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 drive air source (not shown) by an air pipe 19.

When kneading green concrete with the biaxial mixer 1, the driving motors 9 and 9 ′ are driven to rotate the sprockets 8 and 8 ′. The sprockets 8 and 8'rotate the vibration transmitting arm 13 via the elastic body 14 to rotate the kneading shafts 3 and 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 type vibrator 15 to vibrate the piston type vibrator 15. This vibration is transmitted to the kneading shafts 3 and 3'through the vibration transmitting arm 13 and vibrates the kneading shafts 3 and 3'in the circumferential direction. At this time, the elastic body 14 interposed between the sprocket 8, 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 at the same time, the sprocket 8, 8 '. It absorbs the adverse effects of vibrations on the drive transmission mechanism. When the kneading shafts 3 and 3'are vibrated in the circumferential direction, they are transmitted to the kneading blades 6 through the arms 5 attached to the kneading shafts 3 and 3 '. As a result, the kneading blades 6 rotate while vibrating, which gives vibrations to the kneading materials to change the moving speed of each material, increasing the chances of cement entering the gravel and sand. It can mix efficiently and can produce high quality ready-mixed concrete.

Although the piston type vibrator 15 is used as the vibrator, a small rotary type vibrator that generates vibration by the rotation of the roller or the ball may be adopted instead of the piston type vibrator. When adopting a device that does not give mechanical damage to the kneading shafts 3 and 3'in the radial direction, for example, two rotary vibrators are attached to cancel the radial vibrations of the shafts. It is preferable to devise such as giving vibration only in the circumferential direction of the kneading shafts 3, 3 '. An electric vibrator can be used instead of the pneumatic vibrator.

Further, the elastic body 14 is subjected to a mixer kneading test to appropriately determine the one having the optimum elastic force, and in the embodiment, the elastic body is interposed only at one place so as to form the sprockets 8 and 8 ′. The vibration transmitting arm 13 is connected to the vibration transmitting arm 13. However, elastic members may be interposed at a plurality of positions so that the vibration transmitting arm 13 can be connected. Further, the present invention can be applied to a single-axis type and a multi-axis mixer. Needless to say.

[0016]

[Effect of the device]

 As described above, according to the present invention, the elastic body 14 is provided with the sprocket 8, 8'for transmitting the rotational force loosely fitted to the kneading shaft 3, 3'and the vibration transmitting arm 13 fixed to the kneading shaft 3, 3 '. And a piston type vibrator 15 is attached to the vibration transmission arm 13 to vibrate the kneading shafts 3 and 3'in the circumferential direction, thereby rotating the kneading blades 6 while vibrating the kneading blades 6 to thereby mix the kneading material. Since kneading is done by tapping, the moving speed and moving direction of each kneading material is changed without adversely affecting the rotation transmission mechanism of the sprocket 8, 8 ', etc. due to vibration, and the cement between the gravel and the sand is changed. Can be sufficiently advanced to form a uniform cement shell around the gravel and sand, and high-quality ready-mixed concrete can be produced.

[Brief description of 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.

[Explanation of symbols]

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

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Kenichi Umezawa Ichikoh Co., Ltd., 1013 Eijima, Okubo-cho, Akashi-shi, Hyogo

Claims (1)

[Scope of utility model registration request] 1. A two-shaft mixer for kneading various materials by rotating two parallel kneading shafts arranged in a kneading tank in opposite directions by a driving motor, and a sprocket rotationally driven by the driving motor. While loosely fitting the kneading shaft onto the kneading shaft, a vibration transmitting arm is fixed to the shaft end of the kneading shaft in the radial direction, and the vibration transmitting arm and the sprocket are connected via an elastic body. A two-axis mixer equipped with a vibrator that applies vibration in the circumferential direction of the kneading shaft.