Weird. It uses the rotating shaft with eccentric mass installed in the center of the vibrator, and the centrifugal force generated during high-speed rotation is transmitted to the vibrator shell through the bearing, so that the vibrator generates circumferential vibration.
Principle of planetary excitation. It adopts a rotating shaft with one end suspended in the vibrating rod. When the rotating shaft rotates, the tapered part of its drooping end rolls along the conical surface in the rod shell to form planetary motion of the rolling body, which drives the rod to generate circumferential vibration.
Extended data:
Use skills
1) The vibrator should be installed on a solid foundation, and the anchor bolts should have sufficient strength and be tightened. There must be an underground passage in the middle of the foundation for frequent adjustment and maintenance. ?
2) Check and test run before use to check whether the parts are in good condition. All solid parts, especially bearing seat bolts, eccentric block bolts, motor and gear box bolts, must be fastened firmly. ?
3) The vibrator should not be idle for a long time. In production operation, a firm and reliable template locking fixture must be placed to ensure that the template vibrates with the concrete countertop.
4) The gears in the gearbox should be lubricated and cooled due to high speed and heavy load; The oil level in the oil tank shall be kept at a specified level, and the temperature rise during operation shall not exceed 70℃.
5) Check all bearings of the vibration table regularly, remove and clean the grease regularly to make the bearings lubricated well, and pay attention to check the temperature rise of the bearings. When overheating occurs, you should try to eliminate it immediately.
6) The grounding of the motor should be good and reliable, and the power cord and wire connector should be well insulated. There should be no damage and leakage.
7) The surface of vibrating rod should always be clean and flat, so as to have good contact with steel mold. Because the mesa vibrates under high frequency and heavy load, it is easy to crack, so it must be checked and repaired in time. After the completion of each shift, it should be cleaned up in time.
Vibrating rods are classified according to the transmitted vibration.
Plug-in vibrator, external vibrator, surface vibrator
Plug-in vibrator is also called plug-in vibrator. When working, the vibrating head 1 is inserted into the concrete, and its vibration wave is directly transmitted to the concrete. This vibrator is often used to vibrate and compact thick concrete layers, such as piers, abutment foundations and foundation piles.
Its advantages are light weight, convenient movement and wide application. External vibrator, also called attached vibrator, is a kind of motor with vibration function. A special bottom plate is installed on the bottom of the machine. When working, the bottom plate is attached to the formwork, and the vibration wave generated by the vibrator is indirectly transmitted to the concrete through the bottom plate and the formwork.
This kind of vibrator is mostly used in the construction of thin shell members, hollow slab beams, arch ribs, T beams and other places. According to the needs of construction, in addition to the attached external vibrator, there is also a vibrating table for vibrating precast concrete products. The prefabricated parts installed in the formwork are placed on the table connected with the vibrator, and the vibration wave generated by the vibrator is transmitted to the concrete prefabricated parts through the table and the formwork.
The surface vibrator directly places it on the concrete surface, and the vibration wave generated by the vibrator is transmitted to the concrete through the vibration bottom plate 1 fixed on it. Because the vibration wave is introduced from the concrete surface, it is called surface vibrator. When working, two people hold the handle 4 of the vibrator and drag it according to the needs of work. It is suitable for the construction of concrete pavement and bridge deck with small thickness.
References:
Baidu encyclopedia-vibrator