JPH0446866Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a vibrating sieve machine using an explosion-proof motor.

[Prior Art] As is well known, vibrating sieves are used to separate, mix, crush, etc. various powders and granules, but they are also used to handle combustible materials, volatile materials, etc. In some cases, it is necessary to use an explosion-proof motor that does not generate electric sparks for safety reasons. However, the motor of a vibrating sieve machine has conventionally been generally fixed to the sieve frame and has a structure in which the motor itself vibrates, so even if an explosion-proof motor is used, the motor itself vibrates violently and the power cord of the motor vibrates violently. There is a risk that the contact may deteriorate due to mechanical fatigue over a short period of time, resulting in sparks.

Accordingly, Japanese Utility Model Publication No. 55-6700 discloses a motor in which the motor itself is fixed to a base frame so as not to vibrate and is jointed with a coil spring so that rotational power is transmitted via the coil spring. However, in this case, the motor must be placed on the same axis directly below the sieve frame, which means that the base frame must be very tall, which results in poor balance as the height of the sieve frame increases. It lacked stability and was difficult to use.

[Purpose of the invention] This invention aims to eliminate the above-mentioned drawbacks and provide an explosion-proof vibrating sieve machine that can be constructed without increasing its height.

[Means for achieving the purpose] In order to achieve this purpose, the vibrating sieve machine of this invention has an explosion-proof motor fixed to the inner wall of the base frame, and supports the sieve frame on the base frame via a spring. An unbalanced weight is provided on a rotating shaft vertically supported at the center of the lower part of the sieve frame, a pulley is fixed to the rotating shaft, and the pulley and a pulley fixed to the rotational output shaft of the explosion-proof motor are connected. Winding and connecting an endless belt, and further winding the endless belt around a tension pulley,
The tension pulley is provided with a pair of dish-shaped pulley members whose outer peripheral edges are inclined outward, and one of the dish-shaped pulley members is movable in the axial direction, so that the distance between the two dish-shaped pulley members is wide and narrow. By varying the actual outer diameter of the tension pulley,
The movable disc-shaped pulley member is characterized by being provided with a spring that biases the disc-shaped pulley member in a direction to enlarge its substantial outer diameter and a fluid damper that damps the movement of the disc-shaped pulley member.

[Function] The rotational power of the explosion-proof motor is transmitted to the rotating shaft via the endless belt and induces vibrations, while the tension pulley's substantial outer diameter changes due to the movement of the dish-shaped pulley member, causing vibrations on the rotating shaft. Absorbs tension fluctuations in the endless belt due to vibration.

[Example] Next, an example of displaying a plate will be described. Reference numeral 1 designates a pressure-resistant explosion-proof motor fixed vertically to the inner wall surface of a cylindrical base frame 2 via a mounting base 3, and reference numeral 4 designates a pulley fixed to its rotating output shaft. A sieve frame 5 is supported on the base frame 2 via a plurality of coiled springs 6, 6, . . . A sieve rope 7 is stretched horizontally within the sieve frame. 8 is a material input port into the sieve frame 5, and 9 and 10 are discharge ports. A bearing box 12 is fixed at the center of the bottom plate 11 of the sieve frame 5, and the rotation shaft 15 is supported by bearings 13 and 14 in the bearing box 12.
is supported vertically. 16 is an upper unbalanced weight fixed to the upwardly projecting end of the rotating shaft 15, and 17 is a lower unbalanced weight fixed to the downwardly projecting portion of the rotating shaft 15. A pulley 18 is fixed to the downwardly projecting end of the rotating shaft 15. The pulley 18 and the pulley 4 are connected to each other by being wrapped around an endless belt 19 having a V-shaped cross section.

A tension pulley 20 applies tension to the endless belt 19, and the tension pulley 20 is constructed as shown in FIG. 3. That is, bearing 2
1 and 21 vertically support a support shaft 22, a dish-shaped pulley member 23 is pivotally supported on the support shaft 22, and a dish-shaped pulley member 24 that is paired with the dish-shaped pulley member 23 is attached to its boss member 24. ' is provided on the boss portion 23' of the dish-shaped pulley member 23 so as to be slidable in the axial direction.
31 is an O-ring of the sliding part. The dish-shaped pulley member 23 and the dish-shaped pulley member 24 have a dish shape with an outwardly inclined outer peripheral edge, and an endless belt 19 is wound around the gap between them. Dish-shaped pulley member 24
A cylinder 25 is integrally fixed to the upper surface, and a piston 26 fixed to the upper end of the support shaft 22 is inscribed in the cylinder 25. Reference numeral 27 denotes a coiled spring interposed in a compressed state between the upper surface of the dish-shaped pulley member 24 and the lower surface of the piston 26, and the spring 27 biases the dish-shaped pulley member 24 downward by its elasticity. There is. 28 is a piston ring.
The piston 26 is provided with a regulating valve 29 .
In the regulating valve 29, a needle valve 30 is screwed into a vent hole provided in the piston 26, and by adjusting the amount of threading of the needle valve 30, the size of the vent hole can be changed and the amount of ventilation can be adjusted. ing.
Note that the cylinder 25, piston 26, and regulating valve 29 constitute a fluid damper. In the vibrating sieve machine configured in this way, the rotational power of the explosion-proof motor 1 is transmitted through the pulley 4, the endless belt 19, and the pulley 1.
8 to the rotating shaft 15. The sieve frame 5 is vibrated by rotating the unbalanced weights 16 and 17 attached to the rotating shaft 15. The tension pulley 20 is biased by the elasticity of a spring 27 so that the distance between the dish-shaped pulley member 24 and the dish-shaped pulley member 23 becomes narrower. That is, the endless belt 19
Since the spring 27 is biased in a direction to expand the substantial outer diameter of the tension pulley 20 around which the tension pulley 20 is wound, the slack of the endless belt 19 is absorbed. Therefore, even if the distance between the pulleys 4 and 18 changes as the sieve frame 5 and pulley 18 vibrate, the tension of the endless belt 19 does not change significantly and the power of the pulley 4 is stably transferred to the pulley 18. Can be communicated. In addition, the cylinder 25, the piston 26, and the regulating valve 2
9, when the volume of the internal space of the cylinder 25 above the piston 26 changes as the dish-shaped pulley member 24 moves in the axial direction and the cylinder 25 moves up and down, the regulating valve 29 prevents the air from flowing out of the space. The vertical movement of the dish-shaped pulley member 24 is damped by resisting the inflow and limiting the speed of inflow and outflow. In this way, this fluid damper limits the rate of movement of the substantial outer diameter of the tension pulley 20, so that the vertical movement of the dish-shaped pulley member 24 is not increased unnecessarily.

[Effects of the invention] As explained in the embodiments above, the vibrating sieve machine of this invention transmits rotational power to the rotating shaft by belt transmission, so the explosion-proof motor is attached to the rotating shaft on the inner wall surface of the base frame. They can be fixedly installed side by side, making the installation stable without increasing the height of the base frame. A variable-diameter tension pulley equipped with a fluid damper can absorb the slack caused by the vibrations of the endless belt, which suppresses vibrations from being transmitted to the explosion-proof motor. Damage caused by vibration to the connection parts, etc. is reliably prevented, and the risk of electric sparks being generated is eliminated, which is advantageous in preventing accidents.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a longitudinal cross-sectional view of this vibrating sieve machine, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a tension pulley. FIG. 1...Explosion-proof motor, 2...Base frame, 4...Pulley, 5...Sieve frame, 6...Spring, 12...Bearing box, 13, 14...Bearing, 15...Rotating shaft, 1
6, 17... Unbalanced weight, 18... Pulley, 19
... Endless belt, 20 ... Tension pulley, 2
3, 24...Dish-shaped pulley member, 25...Cylinder, 26...Piston, 27...Spring, 29...
Regulating valve.

Claims (1)

[Scope of utility model registration request] An explosion-proof motor is fixed to the inner wall surface of the base frame, a sieve frame is supported on the base frame via a spring, and an unbalanced weight is installed on a rotating shaft that is vertically supported at the center of the bottom of the sieve frame. , fixing a pulley to the rotating shaft, connecting the pulley and a pulley fixed to the rotating output shaft of the explosion-proof motor by winding an endless belt, and further winding the endless belt around a tension pulley; The tension pulley is provided with a pair of dish-shaped pulley members whose outer peripheral edges are inclined outward, and one of the dish-shaped pulley members is movable in the axial direction, so that the distance between the two dish-shaped pulley members is wide and narrow. The substantial outer diameter of the tension pulley is changed by varying the tension pulley, and the movable dish-shaped pulley member includes a spring that biases the dish-shaped pulley member in a direction to enlarge the substantial outer diameter, and the dish-shaped pulley member moves. A vibrating sieve machine characterized by being provided with a fluid damper that damps the flow rate.