JP3043907U - Quantitative sensing device for powder particles - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent the malfunction of a powder or granular material by preventing the powder or granular material from adhering to a sensing plate constituting a quantitative sensing device for powder or granular material. SOLUTION: The sensing plate (13) has an arm (1) with an inclination angle (θ) of 25 to 65 degrees with respect to a vertical surface (14).
Fix to 2).

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a quantitative sensing device for a powder or granular material for preventing the supply of the powder or granular material from being stopped in the powder or granular material supplying process.

[0002]

[Prior art]

 Briefly explaining the manufacturing process of castings, first, make a mold according to the design drawing of the product, insert molding sand (green sand) in which sand and binder are kneaded into the mold and remove the mold to make the sand mold of the product . Next, pig iron, steel materials, etc. are melted and cast as a molten metal in a sand mold, allowed to cool, and then desanded to form a casting material. After checking the blueprint of the product, remove the excess part from the casting material, grind it with a grinder, clean the skin with shot blasting, and then machine it into the final product.

In the above steps, in order to insert the molding sand (green sand) into the mold, the molding sand (green sand) from the hopper is supplied onto the conveyor belt, and the molding belt is used to cast the molding sand (green sand). It is conveyed to the mold part. At this time, it is detected by a quantitative sensing device for powder (granular sand) whether a fixed amount of molding sand (green sand) is placed on the conveyor belt. If there is a defect in this detection, in the worst case, the molten metal will be cast into a mold without casting sand (green sand), even though the casting sand (green sand) has not been filled in a prescribed amount.

FIG. 4 shows a conventional quantitative sensing device 1. The granular material 2 represented by foundry sand (green sand) is supplied from the hopper 5 onto the conveyor belt 4 moving in the space divided by the frame 3, and conveyed to the left method in FIG. Attach the limit switch 7 to the mounting plate 6 fixed to the hopper 5. A substantially L-shaped arm 9 is supported at the tip of a rotary shaft 8 for controlling ON / OFF of a limit switch 7, and a raw sand sensing plate 10 whose front and rear are warped upward is fixed to the tip.

The raw sand sensing plate 10 whose front and back are warped is placed on the raw sand 2 on the belt 4 supplied from the hopper 5, and while the raw sand sensing plate 10 is on the raw sand, that is, the arm 9 While the sensing plate 10 hardly rotates, it is confirmed that the raw sand 2 is placed on the belt in a quantitative state and supplied to the mold. When the supply of the raw sand 2 from the hopper 5 is stopped due to the trouble, the raw sand 2 on the belt conveyor 4 is lost, and the front and rear warped raw sand sensing plate 10 is lowered downward and connected to the limit switch 7. When the rotating arm 9 rotates to a predetermined angle from the original position, the limit switch 7 is activated to stop the molding process and start the work to promote the supply of the green sand 2 from the hopper 5. There is. However, raw sand (which is easy to agglomerate because it is mixed with the binder) adheres to the lower side of the raw sand sensing plate 10 that is bent back and forth, and the amount of the raw sand that has adhered increases due to its high density. When it comes, it becomes heavier than the fresh sand that is moving, and it goes down, and the raw sand that is moving on it rides on the upper side of the plate and moves further down, so there is no fresh sand It often became the same as the state, and the limit switch 7 actuated, and the line was often stopped.

[Problems to be solved by the device]

 It is an object to be solved to provide a powder and granular material quantitative sensing device in which raw sand does not adhere to the raw sand sensing plate and does not malfunction.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present inventor has attempted to improve the sensing plate, in which a flat sensing plate is inclined with respect to a vertical plane along the flow direction of the granular material, and along the flow direction. Basically adopt the means to arrange.

[0007] The inclination angle of the sensing plate is set to be in the range of 25 degrees to 65 degrees. However, if the angle is less than 25 degrees, the area of the plate that comes into contact with the raw sand is large, and powder particles Since the body becomes less slippery, the raw sand is more likely to adhere and malfunctions occur easily. When the temperature exceeds 65 degrees, the sand tends to sink into the layer of raw sand, which causes malfunctions. It is preferably 35 to 50 degrees. The material of the particle sensing plate and the support rod is appropriately selected from stainless steel, plastic, wood, etc. depending on the type of the particle. In addition, the movement of green sand may be reversed, in which case the arm and the sensing plate are in opposite directions, but at this time, a spring is provided between the limit switch and the arm so as not to apply a load to the limit switch. It is preferable. Either a coil spring or a plate spring may be used. When the supply of raw sand from the hopper is stopped due to some trouble, the sensing plate moves downward due to its weight, and a signal is emitted when the arm rotates and reaches the predetermined switching angle of the commercially available limit switch. . The signal stops the molding machine line and the casting metal line. At the same time, the supply of green sand from the hopper is restarted. This will be described in more detail with reference to the following examples.

[0008]

[Embodiment of the invention]

 The quantitative sensing device 15 for powder and granules comprises a mounting plate 6 fixed to the hopper 5, a limit switch 7 held at its free end, and a rotary switch which constitutes a contact of the limit switch 7 and controls on / off. The shaft 8 includes an arm 12 held by a coil spring 11 and a sensing plate 13 supported by the tip of the arm 12. Due to the weight of the arm 12 and the sensing plate 13, the sensing plate 13 is hung vertically with respect to the rotary shaft 8.

As shown in FIG. 3, the sensing plate 13 has an inclination angle (θ) of 25 to 65 degrees with respect to a vertical surface 14 along the flow direction of the powdery or granular material 2, that is, a perpendicular to the conveyor belt 4. It is fixed to the arm 12. Preferably, the inclination angle (θ) is 35 to 50 degrees.

When the granular material 2 is supplied from the hopper 5 onto the conveyor belt 4 and is quantitatively supplied to the granular material 2 (cast sand in this example) in the direction of arrow A (see FIG. 2), the granular material 2 is inclined. The sensing plate 13 receives an upward force, and the sensing plate 13 in the vertical position rotates about the center of the rotating shaft 8 and, as shown in FIG. Shape. This shape is maintained by the sensing plate 13 when the granular material 2 is fed in a fixed amount, but when the amount of the granular material 2 is reduced, the sensing plate 13 moves vertically by its weight and eventually. , The limit switch 7 is turned on to output a warning signal.

Next, an example of application to an actual machine will be described. As shown in FIG. 1, on a layer of green sand 2 supplied from a hopper 5, at one end of a stainless rod (arm) 12 having a diameter of 2 mm and a length of 150 mm, a stainless plate having a thickness of 1 mm × 50 mm × 50 mm The (sand sand sensing plate) 13 is passed through the center of one side at a right angle, and is welded so as to contact the surface of the plate so that the tip is almost in the center of the plate and the other end is welded to the rotary shaft 8 of the limit switch 7. The limit switch 7 to which the raw sand sensing plate 13 and the arm 12 are attached should be arranged almost in the center of the layer 2 of raw sand, and the angle between the arm 12 and the surface of the layer 2 of raw sand should be about 45 degrees. The limiter mounting plate 6 is adjusted and arranged so that. The arm 12 is arranged so as to be at a right angle to the belt 4 when the supply of green sand is stopped due to some trouble. As a result of the operation for 5 months, a small amount of raw sand adhered to the sensing plate, but it did not adhere further, and there was no malfunction.

[Effect of the invention]

 There has been no malfunction for 5 months since the quantitative powder particle sensing device was installed. As a result, the man-hours required for restoration and the damage caused by the unusable trolley were prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a granular material sensing device of the present invention.

FIG. 2 is a plan view of a granular material sensing device of the present invention.

FIG. 3 is a cross-sectional view showing an attachment angle of a sensing plate.

FIG. 4 is a perspective view showing a conventional example.

[Explanation of symbols]

 2 Particles 4 Conveyor belt 5 Hopper 6 Mounting plate 7 Limit switch 8 Rotating shaft 12 Arm 13 Sensing plate

Claims (7)

[Utility model registration claims] 1. A granular material sensing plate, which comes into contact with a moving granular material in layers, is connected to one end of a supporting rod, the other end of the supporting rod is connected to a limit switch, and is connected to the supporting rod. The granular material sensing plate senses the amount of the granular material and rotates about the rotation axis of the limit switch itself, and when the rotated angle reaches a predetermined angle, the limit switch sends a signal. A quantitative sensing device for powder particles, which is characterized by transmitting. 2. The surface of the particle sensing plate is 25 degrees to the vertical line to the support rod connected to the limit switch.
A powdery or granular material sensing device characterized by being twisted 67 degrees. 3. The quantitative sensing device for powder and granules according to claim 1, further comprising a spring provided between one end of the support rod and the limiter. 4. A mounting plate that is supported by a hopper that supplies powder and granular material to a conveyor, a limit switch that is fixed to the mounting plate and that is located above the powder and granular material that is conveyed, and a rotary shaft of the limit switch. Quantitative sensing device for powdery or granular material, comprising: an arm supported by the sensor; 5. A quantitative sensing device for a granular material, wherein a tilt angle of a sensing plate with respect to a vertical line passing through an axis of an arm is 25 to 65 degrees, preferably 35 to 50 degrees. 6. The quantitative sensing device for powder and granular material according to claim 5, wherein the arm is supported by the rotating shaft of the limit switch via a spring. 7. An arm for turning on / off a contact of a limit switch supported on the hopper side extends along the flow direction of the powdery particles to be conveyed, and a sensing plate at the tip thereof is in the flow direction of the powdery fluid. Quantitative sensing device for granular material, at least a part of which is embedded in the granular material so as to form a surface inclined with respect to the vertical surface.