JPH0227908Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a device for sieving aggregate in asphalt plants.In particular, the screen is immediately vibrated to smoothly sieve even in cold regions. The present invention relates to an aggregate sieving device that can perform the sieving of aggregates.

``Prior art'' A conventional aggregate sieving device used in this type of asphalt plant separates aggregate transported by a hot elevator into predetermined particle sizes and supplies it to a hot bin (storage container) below. The main components are a screen that vibrates, a shaft with an eccentric center of gravity attached via a bearing to vibrate the screen, and a drive device that rotationally drives this shaft. It consists of a fixed bearing that rotatably supports the shaft body, and an oil chamber formed in the housing to supply lubricating oil to this bearing, and this oil chamber is supplied with lubrication through a supply pipe. It is known that oil is constantly supplied to allow the bearing to slide smoothly and rotate the shaft, thereby causing the screen to vibrate.

``Problems to be solved by the invention'' However, in the conventional aggregate sieving device, no heat insulation measures are taken especially for the bearing part, and as a result, it is difficult to use in cold regions where the temperature drops below 0℃. When used, when the equipment is stopped, the lubricating oil accumulated in the bearing cools down and increases in viscosity, which prevents sufficient lubricating oil from being supplied to the bearing and prevents smooth startup. There was a problem that interfered with driving.

The present invention has been made in view of the above problems, and provides an aggregate sifting device that can be started up smoothly without increasing the viscosity of lubricating oil even when the device is stopped. The purpose is to

"Means for solving the problem" This invention solves the above problem by covering the outer periphery of the bearing with a cover and providing a blower that supplies hot air into the cover to warm the internal bearing. It is.

"Function" In this invention, when the equipment is stopped in a cold region, etc., the lubricating oil inside the bearing is cooled and its viscosity increases, making it difficult to start the equipment smoothly. to supply hot air into the cover,
Since the bearing portion can be warmed up, the lubricating oil in the bearing is maintained at a state (viscosity) that does not interfere with operation when starting the device.

"Example" The present invention will be described below with reference to the drawings.
1 to 4 show an embodiment of the aggregate sieving device of the present invention.

Reference numeral 1 in the figure indicates an aggregate sieving device (hereinafter simply referred to as "sieving device") of the present invention. This is to separate each batch and supply it to the hot bin 3 below.

The sieving device 1 includes a screen 4 consisting of a screen side plate 4a having an opening at its tip, and screen bodies 4b, 4b, . ，
The shaft 6 is rotatably supported via a joint 7, and the shaft 6 is formed so that its center of gravity is eccentric with respect to the central axis. is connected to the drive device 8,
The screen 4 is vibrated by rotationally driving the shaft body 6 by the drive device 8. The screen 4 is supported on a pedestal 10 so as to be able to move up and down by legs 9 having springs attached to the upper and lower parts, and the screen body 4b,
4b, . . . are in a state in which a gentle slope is formed from the bottom of the input chute 2a of the hot elevator 2 toward the tip (left side in FIG. 1). Furthermore, the screen 4 has a screen side plate 4a.
are attached to side plates 12, 12 which are erected in parallel to the pedestal 10 via a vibrator 11, and the side plates 1
2 and 12 are fixed inside a screen casing 12a that houses the sieving device 1.

Furthermore, as shown in FIG. 3, the bearing 5 includes a bearing 5b fixed within the housing 5a and rotatably supporting the shaft body 6, and a bearing 5b formed within the housing 5a to supply lubricating oil to the bearing 5b. The oil chamber 5c consists of a
A supply pipe 5d for supplying lubricating oil is connected to. Further, an eccentric wheel 6a is attached to a shaft body 6 that protrudes outward from the bearing 5, thereby increasing the vibrating force of the screen 4. And the screen side plate 4a
A cover 1 covering the outer periphery of the bearings 5, 5 is provided on both sides of the bearing 5.
3 and 13 are attached, and this cover 13
to the cover 13 via ducts 14a and 14b.
A blower 15 is connected to supply hot air inside.

As shown in FIG. 4, the blower 15 includes a blower main body 15a and a heating device 15b connected to its discharge port to warm the air blown from the blower.
The heating device 15b includes a box 15c made of a heat insulating material and a heater 15d attached inside the box 15c. Moreover, a sensor 15e for overheating prevention is attached to the end of the box 15c. The suction side of the blower 15 is communicated with the side of the cover 13 through a duct 14a, and the discharge side of the blower 15 is communicated with the bottom of the cover 13 through a duct 14b. In addition, the duct 14
A universal joint 16 for absorbing vibrations of the screen 4 is inserted at the connection portion between a, 14b and the cover 13. Further, a temperature detector 17 is installed on the top of the cover 13, and the temperature inside the cover 13 is detected by this, and the temperature inside the cover 13 is controlled by starting and stopping the blower 15. It is becoming.

Next, the operation of the aggregate sieving device according to the present embodiment configured as described above will be explained along with an example of its use.

Asphalt plants equipped with the sieving device of the present invention usually stop operating at night and start operating in the morning. Therefore, at a predetermined time before the start of operation, the blower 15 is activated by the morning timer to blow hot air into the cover 13.
3. Raise the temperature inside. As a result, the oil chamber 5 of the bearing 5
Warm the lubricating oil in c and maintain the lubricating oil in a state (viscosity) that does not interfere with operation. Next, the asphalt plant is started, and the aggregate, which has been dried and heated in the dryer, is transported upward by the hot elevator 2 and is charged into the screen 4 through the charging chute 2a. At this time, the drive device 8 is started and the shaft body 6 rotates, and the shaft body 6 vibrates violently due to its eccentric center of gravity.This vibration is transmitted to the screen 4 via the bearing 5, causing the screen 4 to rotate. It's vibrating. In addition, the shaft body 6 is rotated by the action of wheels 6a attached to both ends thereof.
Furthermore, the excitation force becomes larger. Next, while the screen 4 is vibrating, the aggregate thrown onto the screen main body 4b passes through the rough sieve of the screen main body 4b from the front as the smaller the aggregate is, and then passes through the coarse sieve of the screen main body 4b. The aggregate falls onto the screen body 4b and falls from the screen body 4b to one end of the hot bin 3. On the other hand, the larger the aggregate, the longer it rolls on the screen body 4b with rough sieve mesh, and the other end of the aggregate falls into the hot bin 3 from the other end. It will be supplied to the end side. Furthermore, if the temperature inside the cover 13 rises above a set temperature due to continued operation of the blower 15, this is detected by the temperature detector 17, and the blower 15 is stopped.

Note that even if the supply of aggregate from the hot elevator 2 is stopped and the vibration of the screen 4 is stopped, the temperature inside the cover 13 is constantly detected by the temperature sensor 17 and the temperature is kept below a certain level. If the temperature of the bearing 5 is low, the blower 15 can be activated to supply hot air into the cover 13, so that the bearing 5 can be kept warm even in cold regions when the outside air temperature drops below 0°C. The lubricating oil near the oil chamber 5c does not cool down and is maintained at a constant viscosity.

Therefore, according to the sieving device 1 of the present invention, the lubricating oil supplied near the oil chamber 5c of the bearing 5 can be warmed before starting the device, so that the sieving device 1 can be used in a state that does not hinder operation, especially in cold regions. This makes it possible to constantly supply lubricating oil to the bearing 5b, and when the shaft body 6 is rotated, the screen 4 can immediately start vibrating, thereby preventing a lack of lubricating oil. The bearing 5 part does not seize, and smooth operation can be maintained.

Note that other embodiments or technical matters other than those described above will be described below.

(i) In the embodiment described above, one blower 15 was provided for each cover 13, but the present invention is not limited to this. Communication may be provided through branched ducts.

(ii) In the above embodiment, the temperature inside the cover 13 can of course be set to an appropriate temperature depending on the outside air temperature in order to maintain the viscosity of the lubricating oil above a certain value.

(iii) In the embodiment described above, the blower is automatically started and stopped, but it may also be started and stopped manually.

"Effects of the Invention" As explained in detail above, in the aggregate sieving device of the present invention, the outer periphery of the bearing is covered with a cover,
Since hot air can be supplied into this cover to warm the internal bearings, even if the outside temperature drops, the lubricating oil inside the bearings can be warmed up and the lubrication can be maintained without any problems in a short time. Can be done. Therefore, even in a cold region, the asphalt plant can be started smoothly, and the asphalt plant can maintain efficient operation, which is an excellent effect.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the aggregate sieving device of the present invention, FIG. 1 is a side view showing the entire sieving device, and FIG. 2 is a front view of the sieving device. FIG. 3 is an enlarged sectional view of the vicinity of the bearing of the sieving device, and FIG. 4 is a partially sectional side view of the blower. 1... Aggregate sieving device, 3... Storage container (hot bin), 4... Screen, 5... Bearing, 6...
... shaft body, 13 ... cover, 15 ... blower, 17 ... temperature detector.

Claims (1)

[Scope of utility model registration request] A shaft body with an eccentric center of gravity is attached to a screen via a bearing, and by rotating the shaft body, the screen is vibrated, and by putting aggregate into the screen, the aggregate is separated into a predetermined particle size. This is an aggregate sieving device for an asphalt plant, which supplies the aggregate to a storage container below, and the outer periphery of the bearing is covered with a cover, and a blower is installed to supply hot air into the cover to warm the bearing inside. An aggregate sieving device characterized by being provided with.