Concrete vibrating bar

Abstract

The utility model discloses a concrete vibrating bar which comprises a shell, a motor and a transmission shaft are coaxially installed in the shell, the motor is installed on the upper portion of the shell, a rubber sleeve is additionally installed between the peripheral wall of the motor and the interior of the shell, a sealing cover body is fixed to the top end of the shell, and the center of the rear side of the sealing cover body is connected with a cable hose. An output shaft of the motor is connected with the transmission shaft through a flexible coupling; bearings are installed at the two ends and the middle of the transmission shaft, and an eccentric vibrator is installed between the two bearings on the bottom side of the transmission shaft. According to the utility model, the transmission shaft is connected with the motor through the flexible coupling, so that the vibration of the transmission shaft can be effectively isolated, and the vibration is prevented from being directly transmitted to the output shaft of the motor to cause the high-frequency vibration of the rotor of the motor; and vibration is isolated from being directly transmitted to the motor from the shell through the rubber sleeve, so that high-frequency vibration of the stator is avoided, and the service life of the vibrating rod can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to a construction device, in particular to a concrete vibrating rod. Background Art

[0002] A concrete vibrator is a construction device that uses its own high-frequency vibration to expel gas from concrete. Existing concrete vibrators mostly adopt an integrated structure, where the rotating shaft is integrated with the drive shaft of the motor, and the motor and the housing are also directly fixed with bolts. In this way, the rotor will be affected by the high-frequency vibration from the drive shaft during operation, and the stator part will also be affected by the high-frequency vibration of the housing, resulting in a reduction in lifespan. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a concrete vibrating rod to solve the technical problems in the above-mentioned background technology.

[0004] The technical solution of the utility model is:

[0005] A concrete vibrator comprises a shell, in which a motor and a transmission shaft are coaxially mounted, the motor being mounted on the upper portion of the shell, and a rubber sleeve being installed between the peripheral wall of the motor and the interior of the shell, a sealing cover being fixed at the top end of the shell, and the rear center of the sealing cover being connected to a cable hose; the output shaft of the motor and the transmission shaft being connected via a flexible coupling; bearings being installed at both ends and the middle portion of the transmission shaft, and an eccentric vibrator being installed between two bearings on the bottom side of the transmission shaft.

[0006] Furthermore, the flexible coupling adopts a tire coupling or a curved spring coupling.

[0007] Furthermore, an expanded diameter section is provided at the top of the shell, and a polygonal brake disc is fixed to the outer periphery of the rear end of the motor. The brake disc is located in the expanded diameter section, and its inscribed circle is larger than the inner diameter of the shell. The brake disc is embedded in a rubber flange, and a through hole for threading the cable is opened in the center of the rubber flange; the top of the expanded diameter section and the sealing cover body are both provided with flanges, which are connected to the rubber flange as a whole by bolts.

[0008] The utility model is beneficial in that:

[0009] In the utility model, the transmission shaft and the motor are no longer rigidly connected, but are connected by a flexible coupling, which can effectively isolate the vibration of the transmission shaft and prevent the vibration from being directly transmitted to the output shaft of the motor, thereby causing high-frequency vibration of the motor rotor. Secondly, a rubber sleeve is installed between the peripheral wall of the motor and the housing. The rubber sleeve isolates the vibration from being directly transmitted from the housing to the motor, avoiding high-frequency vibration of the stator, which can effectively improve the service life of the vibrator rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the utility model.

[0011] In the figure: 1-housing, 11-expanded diameter section, 2-motor, 21-output shaft, 22-brake disc, 3-tire coupling, 4-drive shaft, 41-bearing, 5-eccentric vibrator, 6-rubber sleeve, 7-rubber flange, 71-through hole, 8-sealing cover, 81-flange, 82-sealing gasket, 83-bolt, 9-cable hose. DETAILED DESCRIPTION

[0012] The following further describes specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the descriptions of these embodiments are intended to aid understanding of the present invention and do not constitute limitations on the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0013] like Figure 1 As shown:

[0014] A concrete vibrator comprises a shell 1, in which a motor 2 and a transmission shaft 4 are coaxially mounted. The motor 2 is mounted on the upper part of the shell 1, and a rubber sleeve 6 is installed between the peripheral wall of the motor 2 and the interior of the shell 1. A sealing cover 8 is fixed at the top of the shell 1, and the rear center of the sealing cover 8 is connected to a cable hose 9; the output shaft 21 of the motor 2 is connected to the transmission shaft 4 through a flexible coupling; bearings 41 are installed at both ends and the middle of the transmission shaft 4, and an eccentric vibrator 5 is installed between the two bearings 41 on the bottom side of the transmission shaft 4.

[0015] In the present invention, the transmission shaft 4 and the motor 2 are no longer rigidly connected, but are connected by a flexible coupling, which can effectively isolate the vibration of the transmission shaft 4 and prevent the vibration from being directly transmitted to the output shaft 21 of the motor 2, thereby causing high-frequency vibration of the rotor of the motor 2. Secondly, a rubber sleeve 6 is installed between the peripheral wall of the motor 2 and the shell 1, and the rubber sleeve 6 is used to isolate the vibration from being directly transmitted from the shell 1 to the motor 2. Of course, the coaxiality of the motor 2 will change under high-frequency vibration, but since a flexible coupling is used, this problem can be avoided. The flexible coupling can adopt a tire-type coupling 3, in which the middle is solid or hollow rubber, similar to the structure of a tire, and the two sides are bolted respectively, similar to the structure of a wheel hub, which belongs to the existing technology, can effectively isolate vibration and bear a certain eccentric transmission capacity, or adopt a curved spring coupling, both of which have vibration isolation capabilities and a certain eccentric transmission capacity to offset the impact of the motor 2 not being rigidly fixed.

[0016] To increase vibration isolation, the top of the housing 1 is provided with an expanded diameter section 11, and a polygonal brake disc 22 is fixed to the outer periphery of the rear end of the motor 2. The brake disc 22 is located in the expanded diameter section 11, and its inscribed circle is larger than the inner diameter of the housing 1. The brake disc 22 is then embedded in the rubber flange 7. The center of the rubber flange 7 has a through hole 71 for threading the cable. The top of the expanded diameter section 11 and the sealing cover 8 are both provided with flanges 81, which are connected to the rubber flange 7 as a whole by bolts 83 (a sealing gasket 82 is installed between the two flanges). The advantage of the above design is that the brake disc 22 is used to transmit torque to the rubber flange, thereby cooperating with the rubber sleeve 6 to fix the motor 2. At the same time, the rubber flange can also play a role in vibration isolation. Although the motor 2 and the housing 1 are structurally connected as a whole, there is no direct rigid vibration transmission.

[0017] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A concrete vibrating rod, characterized in that: It includes a shell, in which a motor and a transmission shaft are coaxially installed. The motor is installed on the upper part of the shell, and a rubber sleeve is installed between the peripheral wall of the motor and the interior of the shell. A sealing cover is fixed at the top of the shell, and the center of the rear side of the sealing cover is connected to the cable hose; the output shaft of the motor and the transmission shaft are connected through a flexible coupling; bearings are installed at both ends and the middle of the transmission shaft, and an eccentric vibrator is installed between the two bearings on the bottom side of the transmission shaft.

2. The concrete vibrating rod according to claim 1, characterized in that: The flexible coupling adopts a tire coupling or a curved spring coupling.

3. The concrete vibrating rod according to claim 2, characterized in that: The top of the shell is provided with an expanded diameter section, and a polygonal brake disc is fixed to the outer periphery of the rear end of the motor. The brake disc is located in the expanded diameter section, and its inscribed circle is larger than the inner diameter of the shell. The brake disc is embedded in a rubber flange, and a through hole for threading the cable is opened in the center of the rubber flange; the top of the expanded diameter section and the sealing cover are both provided with flanges, which are connected to the rubber flange as a whole by bolts.

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