JPH073269Y2 - Fluidized bed furnace sand removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for hitting and removing sand taken out from a fluidized bed furnace.

(Prior Art) In a conventional fluidized bed furnace 20, as shown in FIG. 5, sand is put in a metal container 21 surrounded by a heat insulating material 22, and air or air is supplied from an air supply pipe 23 below the metal container 21. Sand in the furnace blown with nitrogen
The product basket 24 is put into the fluidized 28 through the automatic carrier 27, and the lid 25 is closed in the direction of the arrow to heat.
In the fluidized bed furnace, the temperature of the inside of the furnace is uniform due to the flowing sand 28, and the heat capacity of the sand 28 is large, so the heating rate of the product 26 is faster, the processing time is shorter, and the Carburizing and nitriding can be performed by flowing propane, alcohol, ammonia, etc. into the layer furnace.

(Problems to be solved by the invention) However, when taking out the product from the fluidized bed furnace, if the sand 27 attached to the product 26 in the product basket 24 is taken out as it is and quenched as it is, the sand 27 attachment part will cool at a cooling rate. Slows down and causes quenching failure. Further, the sand 27 attached to the product 26 and taken out from the furnace is accumulated in the lower part of the quenching tank in the next step, and it is necessary to raise sand regularly. On the contrary, in the fluidized bed furnace 20, since the sand level is lowered, insufficient heating occurs in the upper part of the product, and it is necessary to check the sand level and replenish the sand. In the case of a manual line, the sand level can be checked and the sand removed when the product is taken in and out, but it is difficult for an automatic line.

Further, it is possible to drop the sand by shaking or tilting it when using a manual line, but this requires a large-scale device, which increases the cost. Although it is possible to use compressed air to remove it, it cannot be used during quenching because the product is cooled to below the quenching temperature by compressed air. Also, there is a method of hitting the furnace wall 28 and dropping it by vibration, but this is not suitable because it damages the furnace wall 28. Therefore, the present invention aims to solve such problems.

(Means for Solving the Problem) In order to achieve the above object, the present invention is a device for hitting a product with a hammer at the tip of an arm attached to a rotary shaft to remove sand, the arm being divided into two parts, and after hitting. The arm equipped with the hammer is characterized by being bent. Further, the arm divided into two parts is characterized in that the arm to which the hammer is attached is bent by its own weight when stopped.

(Operation) With the above structure, the product is repeatedly hit with a hammer attached to the rotary shaft, so that the sand attached to the product is surely dropped. Also, the arm with the hammer attached is divided into two parts, which bend when hit and bend under its own weight when stopped, so interference with the product can be avoided.

(Example) An example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a conventional fluidized bed furnace 20 to which the sand removing device 1 of the present invention is attached. As shown in FIG. 2, the structure of the sand removing device 1 is directly connected to the shaft of the motor 2 to which the rotary shaft 3 is attached. At the end of the rotary shaft 3, the hole 5 for inserting the arm 4 and the arm 4 are provided. A block 9 with fixing screws 6 is attached.
The arm 4 is inserted into the hole 5 to adjust the length of the arm 4 and then fixed by the screw 6. The arm 4 is divided into a base portion 4a fixed to the rotary shaft 3 and a tip portion 4b to which a hammer 7 is attached, and they are connected by a pin 8. FIG. 3 is a diagram showing the operation of the sand removing device 1. When the motor 2 rotates, the hammer 7 rotates about the rotating shaft 3, and the hammer 7 moves the product basket 24.
When it does not hit, the arm 4 rotates in a straight extended state, but in the case of sand removal work, the product basket 24 is placed within the turning radius of the hammer 7, so the hammer 7 hits the side surface of the product basket 24, The sand 27 attached to the product 26 falls due to the impact. At this time, the hammer 7 repels around the pin 8 due to the impact, and the base portion 4a and the tip portion 4b of the arm 4 are bent into a dogleg shape, but the arm 4 is again aligned by the centrifugal force and hits the product basket 24. Repeat.

Further, since the tip portion 4b of the arm 4 is attached to the base portion 4a by the pin 8 at an angle α as shown in FIG. 4, when the rotation is stopped and the centrifugal force is not received, the arm 4 is centered on the pin 8. Even when the arm 4 stops in the direction of the product basket 24, it does not interfere and does not affect the next process.

(Effect of the Invention) Since the present invention is configured as described above, there is no quenching failure due to sand sticking to the product, heating failure due to insufficient sand in the furnace, and confirmation of the sand level in the fluidized bed furnace. Therefore, it is not necessary to replenish sand when there is a shortage of sand in the furnace, check the sand level of the sand filling furnace, and raise sand accumulated in the lower part of the quenching tank, improving productivity.

[Brief description of drawings]

Fig. 1 is a vertical side view of the sand removing device of the embodiment of the present invention attached to a fluidized bed furnace, Fig. 2 is a side view of the sand removing device of Fig. 1, and Fig. 3 is a movement of an arm of the sand removing device. FIG. 4 is a plan view, FIG. 4 is a sectional view taken along line AA showing the attachment of the arm base portion and the tip portion, and FIG. 5 is a vertical side view of a conventional fluidized bed furnace. 1 ... Sand removing device, 2 ... Motor, 3 ... Rotating shaft, 4 ...
… Arm, 4a… Base, 4b… Tip, 5… Hole, 6…
… Screws, 7 …… Hammers, 8 …… Pins, 9 …… Blocks, 24 …… Product baskets, 26 …… Products, 27 …… Sand.

Claims (2)

[Scope of utility model registration request] 1. An apparatus for hitting a product with a hammer at the tip of an arm attached to a rotary shaft to remove sand, wherein the arm is divided into two parts, and the arm attached with the hammer is bent after hitting. A fluidized bed furnace sand removing device. 2. A fluidized bed furnace sand dropping device according to claim 1, wherein the arm divided into two parts is constructed so that the arm attached with a hammer is bent by its own weight when stopped.