JP5196875B2 - Powder feeder - Google Patents

Description

  The present invention relates to a powder feeding device that feeds powder from above to below.

In order to quantitatively cut out powder and send it to a molding device, etc., two rollers installed in parallel are rotated in a direction in which the upper sides are separated from each other, and the powder is passed between the roller and the casing. Thus, a technique for sending out powder is known (see, for example, Patent Documents 1 and 2).
No. 3-8655 JP 2001-158537 A

  When powder is fed by rotating the two rollers in directions in which the upper sides thereof are separated from each other, a large amount of powder remains between the roller and the casing at the end of the operation. Since the remaining powder cannot be easily removed, it is difficult to change the type of powder. In addition, the change in surface roughness in the casing due to the aging of the apparatus makes it difficult to deliver the powder quantitatively and smoothly, and the measurement accuracy is not stable.

  The subject of this invention is providing the powder delivery apparatus which improves the delivery quality of powder in view of the above-mentioned problem.

  In order to solve the above-described problems, the present invention rotates the two rollers in a direction in which the upper sides thereof approach each other while adjusting the circumferential speed to be different from each other.

  Specifically, in the powder feeder, a first roller for feeding powder supplied from above onto the circumferential surface and feeding downward, and a rotary shaft adjacent to the first roller and the first rotating shaft. A second roller disposed substantially parallel to the rotation axis of the roller, wherein the vertical height of the rotation axis of the second roller is higher than the vertical height of the rotation axis of the first roller. By increasing the height, the second roller disposed so that the peripheral edges of both rollers overlap when the both rollers are viewed from above, and the powder is sandwiched between the first roller and the second roller. The first roller and the second roller are rotated in opposite directions so that the first roller and the second roller are rotated downward, and the peripheral speed of the first roller is the peripheral speed of the second roller. Around at least one of the first roller and the second roller so as to be faster Comprising a governor means for adjusting the degree, the.

  Both the first roller and the second roller have a cylindrical outer shape. The first roller and the second roller are adjacent to each other, and the rotation shafts are disposed substantially parallel to each other. The powder is sent out from above by the rotation of this roller. In the present invention, the term “adjacent” refers to a state in which both rollers are adjacent to each other, and is a state in which both rollers are close to each other with a gap.

Here, the driving means rotates the first roller and the second roller so that the powder is sent out while being sandwiched between the two rollers. That is, the upper sides of both rollers are rotated in a direction approaching each other so that the powder supplied from above passes between both rollers and is sent downward. Thereby, the powder is quantitatively sent out downward without forming a bridge between both rollers. Moreover, since it passes between both rollers and falls below, powder does not remain between the roller and the casing at the end of the operation.

  Here, when the peripheral speed of both rollers is the same or the peripheral speed of the second roller is high, the powder supplied from above is rolled. In this case, excess powder that does not enter the gap between the two rollers is sandwiched between the two rollers. Therefore, the speed adjusting means adjusts the circumferential speed of at least one of the first roller and the second roller so that the circumferential speed of the first roller is faster than the circumferential speed of the second roller. adjust. As a result, surplus powder that does not enter the gap between the two rollers is not sandwiched between the two rollers, so that the powder is fed downward without being rolled. Thereby, it becomes possible to improve the delivery quality of powder.

  Here, the second roller has a height in the vertical direction of the rotating shaft higher than a height in the vertical direction of the rotating shaft of the first roller, so that the peripheral edges of the two rollers when viewed from above. Are arranged so as to overlap.

  Powder that is supplied from above by disposing the rollers so that the peripheral edges of the two rollers overlap when the two rollers are viewed from above with the rotational axis of the second roller higher than the rotational axis of the first roller Most of them are not on the peripheral surface of the second roller but on the peripheral surface of the first roller. Therefore, by adjusting the peripheral speed of the first roller to be higher than the peripheral speed of the second roller by the speed control means, the first roller sends out the powder downward, and the second roller Prevents powder from bridging. As a result, the powder is stably fed downward without solidifying in a bridge shape. Further, when both rollers are stopped when a predetermined amount of powder is weighed and dispensed, the supplied powder does not fall from the gap between the rollers.

  Here, the second roller may have a diameter smaller than that of the first roller.

  When the diameter of the second roller located higher than the first roller is smaller than the diameter of the first roller, most of the powder supplied from above is placed on the peripheral surface of the first roller. When a large amount of powder is placed on the peripheral surface of the first roller, the powder is efficiently fed out.

  Here, the speed adjusting means has a power transmission mechanism for transmitting the driving force input from the driving means to the first roller to the second roller, and the power transmission mechanism is the second roller. The peripheral speed may be adjusted.

  Since the first roller and the second roller have a power transmission mechanism that adjusts the peripheral speed, the first roller and the second roller can be obtained only by inputting a driving force to the first roller. Can be rotated so that their peripheral speeds are different from each other.

  It is possible to provide a powder delivery device that improves powder delivery quality.

  Hereinafter, an embodiment of the present invention will be exemplarily described. The powder feeder according to the present embodiment is used for manufacturing a friction material for a brake that brakes a vehicle.

<Overall configuration>
FIG. 1 is an overall perspective view of a friction material manufacturing apparatus 2 including a powder feeder 1 according to an embodiment of the present invention. 2 is a transparent front view of the friction material manufacturing apparatus 2, FIG. 3 is a transparent side view of the friction material manufacturing apparatus 2, and FIG. 4 is a top view of the friction material manufacturing apparatus 2. As shown in FIGS. 1 to 4, the friction material manufacturing device 2 is disposed above the powder measuring device 3 and the powder measuring device 3 for measuring the powder friction material, which is the raw material of the brake friction material. A powder feeding device 1 that quantitatively feeds the powder friction material to the body weighing device 3 and a powder supply that is disposed above the powder feeding device 1 and supplies the powder friction material to the powder feeding device 1 A device 4 is provided.

  In this embodiment, the powder feeding device 1 feeds the powder friction material, which is the raw material of the friction material of the brake, from the powder supply device 4 to the powder weighing device 3, but the present invention is not limited to this. It is not something. That is, the powder feeding device according to the present invention may send powder other than the friction material of the brake, or send it to a device other than the powder weighing device (for example, a mold). May be.

  Further, in the present embodiment, the friction material manufacturing device 2 measures the powder friction material of the four brake pads, and thus the powder weighing device 3, the powder feeding device 1, and the powder supply device 4 are respectively provided. There are four each. However, the powder feeding apparatus according to the present invention is not limited to such a usage pattern.

<Configuration of powder feeder>
First, the configuration of the powder feeder 1 will be described. FIG. 5 is a transparent perspective view of the powder feeder 1 according to the present embodiment. As shown in FIG. 5, the powder feeder 1 corresponds to a main roller 5 (corresponding to a first roller in the present invention) and a sub roller 6 (corresponding to a second roller in the present invention). ), A servomotor 7 (corresponding to drive means in the present invention), and a speed change mechanism 9 (in the present invention) having a gear 8A and gear 8B (corresponding to a power transmission mechanism in the present invention). This corresponds to a speed control means.). Further, the powder feeding device 1 includes a casing 10 that guides the powder friction material falling from the powder supply device 4 to the powder weighing device 3 and prevents the powder friction material from scattering. The casing 10 accommodates the main roller 5 and the sub roller 6 so that the powder friction material supplied from the powder supply device 4 passes between the main roller 5 and the sub roller 6.

  The main roller 5 is formed on its peripheral surface so that a groove 11 for feeding the powder friction material circulates in a spiral shape. The groove 11 also serves to cut out the powder friction material. The main roller 5 captures the powder friction material dropped from the powder supply device 4 in this groove 11 and sends it to the powder metering device 3. The main roller 5 has a rotation shaft connected to the rotation shaft of the servo motor 7 by a drive chain 12, and rotates by receiving power from the servo motor 7. The main roller 5 is provided with a gear 8 </ b> A on the rotation shaft, and transmits the driving force transmitted from the servo motor 7 to the sub roller 6. The main roller 5 is disposed so that the rotation shaft is substantially horizontal.

  The sub-roller 6 is formed on the circumferential surface so that the groove 13 for feeding the powder friction material circulates in a spiral shape. The sub roller 6 prevents the powder friction material deposited on the main roller 5 from being fed out in a bridge shape. The sub roller 6 has a gear 8 </ b> B connected to the rotation shaft, and rotates by receiving a driving force transmitted from the servo motor 7 via a gear 8 </ b> A provided on the rotation shaft of the main roller 5. The sub roller 6 has a smaller diameter than the main roller 5. Further, the sub roller 6 is arranged such that the vertical height of the rotation shaft is higher than the vertical height of the rotation shaft of the main roller 5, and the peripheral edges of both rollers overlap when viewed from the top. When the rollers are stopped, the supplied powder friction material does not fall from the gap between the rollers. FIG. 6 is a top view of both rollers as viewed from above. As shown in FIG. 6, the sub-roller 6 is located higher than the main roller 5 and is disposed so that the peripheral edges of both rollers overlap.

The servo motor 7 is a motor that can be shifted by a control device (not shown), and rotationally drives the main roller 5 and the sub roller 6. The servo motor 7 transmits power to the main roller 5 via the drive chain 12. The servo motor 7 transmits power to the auxiliary roller 6 through the drive chain 12, the main roller 5, and the gears 8A and 8B. The servo motor 7 rotates the main roller 5 and the sub roller 6 in opposite directions by connecting the rotation shaft of the main roller 5 and the rotation shaft of the sub roller 6 with gears 8A and 8B. . The servo motor 7 is electrically connected to the powder weighing device 3 by a control circuit (not shown), and a predetermined amount of the powder friction material is deposited in the weighing hopper 18 until both weighings are completed. The roller stops after high speed, medium speed, and low speed.

  As described above, the transmission mechanism 9 includes the gear 8A and the gear 8B. The speed change mechanism 9 is configured such that the number of teeth of the gear 8B is larger than the number of teeth of the gear 8A. Further, since the diameter of the sub roller 6 is smaller than the diameter of the main roller 5, the speed change mechanism 9 is driven to rotate so that the peripheral speed of the main roller 5 is higher than the peripheral speed of the sub roller 6. Is possible.

<Configuration of powder supply device>
Next, the configuration of the powder supply device 4 will be described. FIG. 7 is a transparent perspective view of the powder supply device 4. As shown in FIG. 7, the powder supply device 4 includes a powder hopper 14 that accommodates the powder friction material, a spiral-shaped delivery screw 15 for dropping the powder friction material onto the powder delivery device 1, and a delivery screw. A drive motor 16 that rotationally drives 15 is provided.

  The powder hopper 14 is open on the upper side, and is configured so that a powder friction material can be input from above. Further, the powder hopper 14 has a hole 17 on the lower side, and the powder friction material gathered in the hole 17 by the rotation of the delivery screw 15 is dropped to the powder feeder 1.

  The delivery screw 15 is composed of two screws whose spiral directions are different from each other. When the two screws are driven to rotate, the two screws bring the powder friction material together and collect them in the hole 17.

<Configuration of powder weighing device>
Next, the configuration of the powder weighing device 3 will be described. FIG. 8 is a transparent perspective view of the powder weighing device 3. As shown in FIG. 8, the powder weighing device 3 includes a weighing hopper 18, a weighing device 19 that measures the weight of the weighing hopper 18, and an opening / closing device that opens the weighing hopper 18 and drops the powder friction material inside. 20 is provided.

  The weighing hopper 18 has an opening / closing door 21, and the opening / closing device 20 opens the opening / closing door 21 to drop the powder friction material in the hopper downward. The weighing hopper 18 accommodates the powder friction material delivered from the powder feeder 1. The weighing hopper 18 has a balancer 22 for loading the open / close door 21 in the closing direction.

  The weighing device 19 measures the weight of the weighing hopper 18. The weighing device 19 is zero-adjusted in a state where no powder friction material is accommodated in the weighing hopper 18, and can measure the weight of the powder friction material accommodated in the measurement hopper 18. is there.

  The opening / closing device 20 is an air cylinder that expands and contracts by air pressure, and is arranged so as to push the opening / closing door 21 and open the weighing hopper 18 when extended. The opening / closing door 21 is closed by the weight of the balancer 22 when the opening / closing device 20 contracts.

<Operation>
Next, the operation of the friction material manufacturing apparatus 2 will be described. In FIG. 9, the flowchart of the operation | movement order of the friction material manufacturing apparatus 2 is shown. Moreover, in FIG. 10, the state of the friction material manufacturing apparatus 2 in each process is shown. Hereinafter, the operation of the friction material manufacturing apparatus 2 will be described with reference to the flowchart of FIG. 9 and the state diagram of FIG. 10.

  (Step S101) First, a powder friction material is put into the powder hopper 14, and the drive motor 16 is activated to rotate the delivery screw 15 (FIG. 10A). As a result, the powder friction material is collected in the holes 17 and falls onto each roller.

  (Step S102) Next, the servo motor 7 is started. As a result, the powder friction material is quantitatively supplied to the weighing hopper 18, and the powder friction material gradually accumulates in the measurement hopper 18 (FIG. 10B).

  (Step S103) The powder weighing device 3 and the servo motor 7 are electrically connected by a control circuit (not shown), and the powder feeding device 1 is kept until a predetermined amount of powder friction material is deposited in the weighing hopper 18. Continue to feed the powder friction material to the weighing hopper 18 by. During this time, when each roller rotated by the servo motor 7 passes through a high speed, a medium speed, and a low speed, and a predetermined amount of powder friction material is deposited in the weighing hopper 18, the servo motor 7 is stopped (FIG. c)). Thus, the measurement of the powder friction material is completed.

  (Step S104) The control circuit (not shown) moves the opening / closing device 20 to open the opening / closing door 21, and drops the powder friction material from the weighing hopper 18 (FIG. 10 (d)). Thus, a series of processing is completed.

<Effect>
According to the powder feeding device according to the present embodiment, the two rollers are rotationally driven so that the peripheral speeds of the two rollers are different from each other, so that the powder can be sent quantitatively downward. Further, since the two rollers are rotationally driven by one motor, the powder friction material can be efficiently sent downward with less power consumption. In addition, since the two rollers are driven to rotate by a single motor, the number of control devices such as inverters, breakers, and relays that control the motor is reduced, and noise, vibration, noise, etc. generated from the control devices are suppressed. Is possible. In addition, since the servo motor is used to rotate the roller, it is possible to freely control the rotation speed and arbitrarily adjust the powder friction material feed time. In addition, since the powder friction material passes between the two rollers in a straight line from top to bottom, the powder friction material does not accumulate between the roller and the casing at the end of the operation, and raw material residue is generated. do not do. This eliminates the need for cleaning the remaining raw material and makes it very easy to change the type of powder friction material.

The whole perspective view of a friction material manufacturing apparatus. The permeation | transmission front view of a friction material manufacturing apparatus. The permeation | transmission side view of a friction material manufacturing apparatus. The top view of a friction material manufacturing apparatus. The transmission perspective view of a powder feeder. The top view of the roll part of a powder supply apparatus. The permeation | transmission perspective view of a powder supply apparatus. The permeation | transmission perspective view of a powder measuring device. The flowchart of the operation | movement order of a friction material manufacturing apparatus. The state figure of the friction material manufacturing apparatus in each process.

Explanation of symbols

1 ... Powder feeder 2 ... Friction material manufacturing equipment 3・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Powder Weighing Device 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Powder Feeding Device 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Main Roller 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Sub Roller 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Servo motors 8A, B ... Gear 9 ... Transmission mechanism 10 ... ··········································································· Drive chain 14 ·························································································· Screw 16 ... drive motor 17 ... hole 18 ... ······················································································ Opening and closing device 21 ···················································· Balancer

Claims (2)

A first roller for feeding powder supplied from above onto the peripheral surface and sending it downward;
A second roller adjacent to the first roller and having a rotation axis disposed substantially parallel to the rotation axis of the first roller, the vertical height of the rotation axis of the second roller Is higher than the vertical height of the rotation axis of the first roller, and the second roller is disposed so that the peripheral edges of both rollers overlap when both rollers are viewed from above.
Drive that rotationally drives the first roller and the second roller in opposite directions so that the powder is sent downward while being sandwiched between the first roller and the second roller Means,
Speed adjusting means for adjusting the peripheral speed of at least one of the first roller and the second roller so that the peripheral speed of the first roller is faster than the peripheral speed of the second roller; equipped with a,
The speed adjusting unit transmits a driving force input from the driving unit to the first roller to the second roller, and rotates the second roller simultaneously with the first roller. And the power transmission mechanism adjusts the peripheral speed of the second roller.
Powder feeder. The second roller has a diameter smaller than the diameter of the first roller.
The powder feeder according to claim 1.

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