JPH11157660A - Powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder supply device capable of precisely controlling powder supply quantity without largely adjusting the number of rotation of a rotary feeder. SOLUTION: This powder supply device is furnished with a hopper base having a supply passage 12 extending downward from a lower end of a hopper, a rotary feeder 13 to be roughly horizontally arranged so as to cross the supply passage 12 and to be axially rotated by a motor, a cylindrical member 23a arranged free to move in the vertical direction with a clearance G on an upper position of the rotary feeder 13, a clearance adjustment mechanism 24 to adjust the clearance G. Powder supply quantity is roughly set by firstly adjusting the clearance G between the cylindrical member 23a and the rotary feeder 13 by the clearance adjustment mechanism 24. Thereafter, the powder supply quantity is precisely controlled to a desired value by finely adjusting the number of rotation of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder supply apparatus, such as a powder supply apparatus for a build-up welding apparatus, capable of smoothly supplying powder by controlling a supply amount of the powder with high precision. .

[0002]

2. Description of the Related Art In order to improve wear resistance of products requiring wear resistance, such as a valve head of an intake valve and an exhaust valve in an internal combustion engine, for example, a cladding welding apparatus is used. This is an apparatus for performing overlay welding of a Cr-WC alloy, and the applicant has already filed an application for the overlay welding apparatus shown in FIG. 7-242339). In FIG. 4, reference numeral 1 denotes a material valve stock portion for storing a material valve A to be weld-welded, reference numeral 2 denotes a welded portion for performing overlay welding on a valve head of the material valve A, and reference numeral 3 denotes a torch 2 a of a welded portion 2.
Material valve holding means for holding the material valve A in an inclined state such that the valve head of the material valve A faces the other, and rotating the material valve A about an axis.

[0003] Reference numeral 4 denotes a product valve stock unit for storing a product valve B which has been overlaid and welded in the welding portion 2.
Reference numeral 5 denotes a valve conveying unit that conveys the material valve A from the material valve stock unit 1 to the material valve holding unit 3 and conveys the product valve B from the material valve holding unit 3 to the product valve stock unit 4. In addition, a powder supply device 10 that supplies a powder W made of a Co—Cr—WC alloy or the like to the torch 2 a is connected to the welding portion 2 via a transfer pipe 6.

[0004] When the powder W is supplied to the welding portion 2 in the overlay welding apparatus, the powder W is temporarily stored in a powder supply apparatus 10 and the powder W is supplied to a flow of argon gas or the like. Is supplied to the welded portion 2 via the transfer pipe 6 at a constant rate. As shown in FIG. 5, the powder supply device 10 includes a supply passage 12 extending downward from a lower end of the hopper 11.
A rotary feeder 13 having a groove 13a formed on the outer peripheral surface thereof is provided so as to cross the supply passage 12, and the rotary feeder 13 is rotated by a rotating mechanism 1 such as a motor.
4, the powder W filled in the groove 13a is transported by 180 ° at the upper portion of the rotary feeder 13 to be positioned at the lower side of the rotary feeder 13, and the powder W is moved by its own weight and centrifugal force. It is configured to drop.

[0005]

Conventionally, the amount of powder supplied (the volume of powder supplied per unit time) has been adjusted by adjusting only the rotation speed of the motor. That is, in order to adjust the powder supply amount in accordance with the arc current value at the welding portion (torch) of the cladding device,
The number of rotations of the rotary feeder must be accurately controlled. For example, as shown in FIG. 6, when the desired arc current value changes with time in a trapezoidal shape as indicated by reference numeral 7, the powder supply amount 8 indicated by a dashed line is changed at least by the rotation speed of the motor. 4 points 9a, 9b, 9c, 9d
, It is necessary to substantially match the pattern of the change with time of the arc current value.

[0006] When the lot size of the powder is changed and the grain size of the powder is greatly changed, the rotation speed of the motor must be greatly changed in order to control the powder supply amount as described above. . In other words, when the rotation speed of the motor is constant, the supply amount decreases as the particle size of the powder increases, so that when the particle size of the powder is changed to a large value, the rotation of the motor We need to increase the number.

However, the motor rotation speed and the powder supply amount generally have a characteristic in the vicinity of the motor rating, but this characteristic is lost as the motor rotation speed increases. Therefore, when the powder lot is changed, there is a problem that it is difficult to accurately control the powder supply amount only by the rotation speed of the motor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. When the particle size of powder is changed, a cylindrical member and a rotary feeder below the cylindrical member may be used as necessary. It is an object of the present invention to provide a powder supply device capable of accurately controlling a powder supply amount without adjusting a rotation speed of a motor during welding by adjusting a gap between the powder supply devices.

[0009]

According to the present invention, there is provided a powder supply apparatus having a hopper for storing powder and a supply passage extending downward from a lower end opening of the hopper. A main body, and a rotary feeder that is disposed substantially horizontally so as to cross the supply passage, and is rotated around an axis by operation of a rotation mechanism;
A tubular member that constitutes a part of the supply passage and is disposed vertically above the rotary feeder so as to be movable vertically, and for adjusting a gap between the rotary feeder and the tubular member. And a gap adjusting mechanism.

In the present invention, the gap between the cylindrical member and the rotary feeder below the cylindrical member is adjusted by a gap adjusting mechanism in accordance with the desired amount of powder to be supplied. Set roughly. Then, by finely adjusting the number of revolutions of the motor, the supply amount of the powder is matched with a desired supply amount. As described above, since the rotation speed of the motor can be finely adjusted, the rotation speed of the motor does not deviate from the rated value, and the supply amount of the powder can be adjusted with high accuracy.

Here, as in the second aspect of the present invention, the gap adjusting mechanism is inserted into a circular hole formed in a side surface of the cylindrical member so as to extend horizontally into the supply device main body,
And a rotatable member having a cylindrical eccentric portion fitted to the circular hole at the tip, and by adjusting the rotational position of the rotatable member, the vertical position of the cylindrical eccentric portion can be adjusted. Thereby, the gap between the cylindrical member and the rotary feeder can be easily adjusted by moving the cylindrical member up and down.

Further, since the gap is set according to the rotational position of the rotatable member as described above, a bolt member is used as the rotatable member, and the head of the bolt member is used. Is marked on the main body of the supply device, and a scale indicating the gap is provided with the mark, so that the gap at that time can be easily recognized only by looking at the scale that matches the mark.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an embodiment of the powder supply device of the present invention, FIG. 2 is a left side sectional view in which the supply device main body of FIG. 1 is enlarged, and FIG.
In the following, an embodiment of the present invention will be described with an example of a powder supply device of a build-up welding device, but the present invention is not limited to this, and the present invention controls the supply amount of powder with high accuracy. The present invention can also be applied to a general powder supply apparatus which is supplied with a smooth supply.

First, as shown in FIG.
Reference numeral 0 denotes a hopper that stores the powder W, a hopper base 19 that has a supply passage 12 extending downward from a lower end opening 11a of the hopper 11, and a hopper base 19 that is provided so as to cross the supply passage 12, and the axis of which is provided. A rotary feeder 13 rotatably provided to extend in a horizontal direction, and a rotary feeder rotating mechanism 1 for rotating the rotary feeder 13
4 and a transfer pipe 6 provided at the lower end of the supply passage 12 and guiding the powder W transferred downward by the rotation of the rotary feeder 13 to the welding portion 2.

The hopper 11 is composed of a cone portion 16 having the lower end opening 11a formed therein, a cylindrical side portion 17, and a lid portion 18 placed over the side portion 17. 19, a cone portion 1 is attached to a cylindrical connecting member 19b attached to an upper portion of a base portion 19a.
6 is inserted and fastened to the rod 27 so as to be detachably attached.

The cone portion 16 and the lid portion 18 are required to have a certain degree of strength, and are made of a metal material such as stainless steel.
It is made of a transparent or translucent glass or plastic material so that the stored amount of the powder W in 1 can be observed from the outside. A disc-shaped stopper 21 formed at the upper end of the cone portion 16 at the lower end 11a and having a diameter larger than that of the opening 11a is bolted to the head and a stepped circle having an enlarged diameter portion at the body. A columnar valve 20 is mounted so as to be able to move up and down.

At the center of the valve 20, there is formed a through-hole 20a extending in the axial direction (vertical direction in FIG. 1). Above the through-hole 20a, there are inclined holes 20b, 20b are formed. Also, the valve 20
Is a large-diameter portion 20c provided at the center of the trunk portion and a cone portion 16
Spring 2 interposed between the inner peripheral step 17a and
2 is always urged downward in the figure.

When the hopper 11 is mounted on the hopper base 19, the valve 20 abuts against the contact surface 19aa with the base 19a and is restrained from moving downward. The hole 20a is held in communication with the hole 20a via the inclined hole 20b. When the hopper 11 is removed from the hopper base 19, the compression spring 22
As a result, the valve body 20 is moved downward, so that the inclined hole 20b is closed, so that the powder W remaining inside the hopper 11 can be prevented from leaking from the opening 11a.

The supply passage 12 is formed so as to penetrate vertically through a base portion 19a constituting a hopper base 19, and communicates with a through hole 20a formed in the center of the valve 20. Further, in the supply passage 12, first and second passage forming members 23a and 23b forming an orifice passage for the powder W are incorporated. The first passage forming member 23a is a tubular member, and is provided above the rotary feeder 13 so as to be vertically movable with a gap G (see FIG. 2) therebetween. The size can be adjusted by a gap adjusting mechanism 24 (see FIG. 2) described later. The second passage forming member 23b is located and fixed below the rotary feeder 13.

At the lower end of the orifice passage formed by the second passage forming member 23b, the powder W transferred downward by the rotation of the rotary feeder 13 is guided to the welding portion 2 of the overlay welding apparatus main body. Pipe 6 for
Are connected. The base portion 19a is provided with a through hole 24 extending in the horizontal direction.
The rotary feeder 13 is rotatably disposed at a portion intersecting the supply passage 12. This rotary feeder 13 is knurled,
A number of grooves 13a are formed on the outer peripheral surface along the axial direction of the rotary feeder 13. The rotary feeder rotating mechanism 14 includes a drive shaft 14a inserted and set in the rotary feeder 13, and a motor 14b (for example, a stepping motor) for rotating the drive shaft 14a.

As shown in FIG. 2, the base portion 19a is provided with a nozzle insertion hole 25a which is inclined downward and to the right in the figure. Are urged toward the distal end by a spring 26a. The tip of the nozzle 33 is directed toward the outer peripheral surface of the rotary feeder 13,
Receiving the supply of argon gas from an argon gas supply source (not shown) connected to the base end side of the nozzle 33, the powder W separated from the groove 13a of the rotary feeder 13 is conveyed toward the welding portion 2. It has become.

Next, as shown in FIG. 2, the gap adjusting mechanism 24, which is a feature of this embodiment, has a circular hole 23c formed on the side surface of the first passage forming member 23a which is a cylindrical member. I have. On the other hand, a small-diameter through-hole 25 is formed in the base portion 19a at a position facing the first passage-forming member 23a, and a large-diameter through-hole 26 communicating with the small-diameter through-hole 25 is formed coaxially. I have. A small-diameter portion 28 at one end of a flange member 27 is inserted into the large-diameter through hole 26 of the base portion 19a, and the flange member 27 is
9a is detachably fixed by a plurality of screws 27a. One end surface of a hexagon nut 31 is fixed to the end surface of the small diameter portion 29 on the other end side of the flange member 27.

An adjusting bolt 30 (a rotatable member) as a bolt member is screwed into the hexagon nut 29. The adjusting bolt 30 is further provided with an inner hole of the flange member 27 and a small-diameter through hole of the base portion 19a. 25. Reference numeral 39 denotes a C-shaped ring fitted into a circumferential groove formed in the adjusting bolt 30. As shown in FIG. 2, when the C-shaped ring 39 comes into contact with the distal end surface of the flange member 27, The adjustment bolt 30 cannot move to the right in the figure. The hopper base 19, the flange member 29, the hexagon nut 31, and the like constitute a supply device main body.

At the tip of the adjusting bolt 30 (on the side opposite to the head 32), a cylindrical eccentric portion 30 eccentric to the main body portion is provided.
a is provided integrally with the cylindrical eccentric portion 30a.
Is the circular hole 23c of the first passage forming member 23a.
It is fitted in. In this example, the cylindrical eccentric part 30
The eccentricity e of a (see FIG. 2) is 0.5 mm.
By rotating the adjusting bolt 30 based on the above-described configuration, the cylindrical eccentric portion 30 of the adjusting bolt 30 is rotated.
a, the vertical position of the first passage forming member 23a is adjusted, and as a result, the gap G between the first passage forming member 23a and the rotary feeder 13 is changed.
Can be adjusted up to 1 mm.

As shown in FIGS. 2 and 3, a marking 37 is formed on the top surface of the head 32 of the adjusting bolt 30 so as to extend in the radial direction. On the outer surface of the flange member 27, a ring-shaped scale plate 35 is provided with a screw 36.
a, 36b. A scale 38 is formed on the outer surface of the scale plate 35 by engraving over 180 degrees in the circumferential direction. The scale 38 has a gap of 0.1 mm from the gap G, and the scale 38 indicated by the mark 37 of the adjustment bolt 30 indicates the size of the gap G at that time. Therefore, the gap G can be immediately known.

Next, the operation of the overlay welding apparatus provided with the above powder supply device will be described. First, the hopper 11 filled with the powder W therein is set above the base 19a via the connecting member 19b. Then, according to the particle size of the powder F, the first passage forming member 2 is
The gap G between 3a and the rotary feeder 13 is roughly set. Thereafter, the rotary feeder rotating mechanism 14 is operated to rotate the rotary feeder 13 in the direction indicated by the arrow in FIG.

At this time, the powder W filled in the hopper 11 flows downward by its own weight through the inclined hole 20b and the communication hole 20a of the valve 20, and is formed in the first passage forming member 23a. Rotary feeder 1 through passage
3 and the rotary feeder 1
3 is filled in the upper groove 13a (see FIG. 1). Then, the powder W filled in the groove 13a is transported by 180 ° according to the rotation of the rotary feeder 13 and reaches the lower side of the rotary feeder 13, where it falls downward under the own weight of the powder W and centrifugal force. I do. When the argon gas is ejected from the powder carrier gas supply nozzle 33, the powder W separated from the groove 13a of the rotary feeder 13 is carried toward the welding portion 2.

During welding, as in the prior art, in order to control the amount of powder supplied in accordance with the arc current value at the welding portion (torch) of the build-up welding apparatus, the rotation speed of the motor 14b and thus the rotary speed are reduced. The number of rotations of the feeder 13 is controlled.

In the present embodiment, first, the gap G between the first passage forming member 23a and the rotary feeder 13 is adjusted by the gap adjusting mechanism 24 in accordance with the desired supply amount of the powder F. The supply amount of the body F is roughly set. Therefore, during welding, the supply amount of the powder F can be matched with a desired supply amount only by finely adjusting the rotation speed of the motor 14b. As described above, since the rotation speed of the motor 14b can be finely adjusted, the rotation speed of the motor 14b does not deviate more than the rating, and therefore, the supply amount of the powder F can be adjusted with high accuracy. Moreover, in the present embodiment, the scale plate 35
Turn the adjustment bolt 30 while watching the
The gap G can be precisely and easily adjusted to a desired value by the scale 7 and the scale plate 35.

[0030]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, first, a gap adjusting mechanism is used to adjust the distance between the cylindrical member and the rotary feeder below the cylindrical member in accordance with a desired amount of powder to be supplied (a supply volume of the powder per unit time). Is adjusted, and the supply amount of the powder is roughly set. Then, by finely adjusting the number of revolutions of the motor, the supply amount of the powder is matched with a desired supply amount. As described above, since the rotational speed of the motor can be finely adjusted, the rotational speed of the motor does not deviate from the rated range, and the amount of supplied powder can be adjusted with high accuracy.

According to the second aspect of the present invention, in addition to the above effects,
By adjusting the rotational position of the rotatable member, the vertical position of the cylindrical eccentric portion can be adjusted, whereby the cylindrical member can be moved up and down to easily adjust the gap with the rotary feeder, and as a result, The powder supply amount can be easily adjusted. According to the third aspect of the present invention, in addition to the above-described effects, the gap at that time can be easily recognized only by looking at the scale that matches the mark on the head of the bolt member. As a result, the powder supply amount can be further reduced. Easy to adjust.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a powder supply device of the present invention.

FIG. 2 is an enlarged left side sectional view of the supply device main body of FIG.

FIG. 3 is a view as viewed from an arrow X in FIG. 2;

FIG. 4 is a schematic configuration diagram of a build-up welding device to which the powder supply device of the present invention is applied.

FIG. 5 is a longitudinal sectional view of a conventional powder supply device.

FIG. 6 is a graph showing an example of an increase / decrease mode of an arc current value and a powder supply amount of a welding torch.

[Explanation of symbols]

 W powder 2 welded part 6 transfer pipe 7 arc current value 8 powder supply amount 9a, 9b, 9c, 9d control point 10 powder supply device 11 hopper 12 supply passage 13 rotary feeder 13a groove 14 rotary feeder rotation mechanism (rotation mechanism) 14b Motor 19 Hopper base 23a First passage forming member (cylindrical member) 23b Second passage forming member 23c Circular hole 24 Gap adjusting mechanism 27 Flange member 30 Adjusting bolt (bolt member) 30a Cylindrical eccentric portion 35 Scale plate 37 Engraving 38 Scale

Claims (3)

[Claims] 1. A hopper for storing powder, a supply device main body having a supply passage extending downward from a lower end opening of the hopper, and substantially horizontally disposed so as to cross the supply passage, A rotary feeder that is rotated around an axis by an operation of a rotation mechanism; a tubular member that constitutes a part of the supply passage, and that is disposed at a position above the rotary feeder and that is vertically movably disposed; A powder feeder, comprising: a gap adjusting mechanism for adjusting a gap between the feeder and the tubular member. 2. The powder supply device according to claim 1, wherein the gap adjusting mechanism is inserted into a circular hole formed in a side surface of the tubular member so as to extend horizontally in the supply device main body, And a rotatable member having a cylindrical eccentric portion fitted at the tip with the circular hole. 3. The powder supply device according to claim 2, wherein the rotatable member is a bolt member, a mark is attached to a head of the bolt member, and a mark is provided on a side of the supply device main body. And a mark indicating the gap with the mark.