JPH03503737A - wire pistol with controlled feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Wire pistol technology field with controlled feeding device The present invention provides a drive wheel for wire driven by a motor and a drive wheel for pushing the wire to the drive wheel. Wire feeding device with opposing rolls for basting and controlling the wire feeding speed relates to a wire pistol equipped with a device for

Conventional technology Such wire pistols are used for so-called flame shooting, during which the wire is The gas head is guided by a device to a gas head with a radiant nozzle. pressurized air and oxygen The combustion of the gas introduced into the gas head causes the wire material to melt and Splashing occurs and this material is ejected through the nozzle along with the combustion gases.

The wire feed rate is adjusted to simultaneously eject the wire material to be flamed. It is important to keep it as constant as possible.

In the above-mentioned known wire pistol, the rotation speed of the drive motor is controlled. wire feed as uniform as possible by keeping it constant. is being attempted. However, such methods do not allow sufficient uniformity of the wire. It is not possible to obtain a uniform feed rate and therefore a uniform jet of wire material to be flamed. It was found that it was not possible to generate an output.

Disclosure of invention The object of the invention is that the wire is moved at a constant feed rate, so that during the flame emission the flame Provides a wire pistol that achieves uniform ejection of wire material to be flamed It is to be.

According to the present invention, the above problem can be solved by connecting the wire for measuring the current value of the feed rate. A device that is equipped with a measuring wheel that touches the wire and controls the feed speed of the wire measures the pressing force of the opposing roll. The control device will not be regulated by the effect that the control device has on the motor drive. In relation to value deviations, it is solved by inclusion.

According to such an inventive solution, it is possible to measure the current value of the feed rate and to Changes in the pressing force of the opposing rolls lead to uneven wire transport (the difference between the drive wheels and the wire The wire can be fed at a constant feed rate by adjusting and eliminating slippage between It can be moved with.

In an advantageous embodiment of the invention, an opposite shaft for pressing the wire against the measuring wheel is provided. is provided for the measuring wheel. This countershaft has a countershaft with a counterroll for the drive wheel. It can be advantageously mounted on a weighing rod, and this weighing rod has the ability to push the opposing roll against the drive wheel. A pressing device is attached that presses the opposing shaft against the measuring wheel.

The scale rod is connected to the wall of the housing for the wire pistol via an operating rod, This is how it is supported.

When the pressing device can be adjusted along the balance rod, i.e. when the point of application of the force can be moved. It turned out to be particularly advantageous. In this case, preferably as a pressurized cylinder The pressing force of the pressing device that is formed is based on the opposing shaft of the measuring wheel and the opposing roll of the driving wheel. Therefore, the pressing force with which the opposing roll presses the wire against the drive wheel is Vary for control of slippage between wire and drive wheel.

The measuring wheel for measuring the current value of the wire feed rate is connected to a stepwise rotation applicator. Advantageously, the rotation applicator emits a digital signal corresponding to the feed rate. .

This signal is detected by a microprocessor system that is advantageously used to detect control signals. , the measured value of the drive motor rotation speed supplied to the tachometer to be connected to the drive motor, and Both are further processed.

A microprocessor system is provided to supply drive voltage to the drive motor. The control circuit that outputs a control signal acting on a control device provided for the purpose of

Further advantageous embodiments of the invention are apparent from the dependent claims.

Brief description of the drawing FIG. 1 is a diagram of an embodiment of a wire pistol of the present invention equipped with a gas head for emitting a flame. The housing wall and drive wheel have been omitted here for a better view. Ru. Figure 2 shows wire feed control that eliminates slippage, and Figure 3 shows additional drive pairs. A cross-sectional view of a feeding device equipped with a direction roll, FIG. 4 shows an operation for controlling the wire feeding speed. It is a business diagram.

Best mode for carrying out the invention The invention will be explained in more detail below by means of examples and the accompanying drawings.

In FIG. 1, 30 indicates a wire pistol. The housing 31 includes a drive wheel 2 A drive motor 1 is attached to drive the motor.

The drive wheel shaft does not move. The wire to be transferred (not shown) is driven by the drive transport 2 and the opposing roll. 3, this opposing shaft can be pressed against the drive wheel 2, and for this purpose It is adjustably held on the balance rod 4 by its shaft. in the direction of wire transport In front of the drive wheel 2, a measuring wheel 5, which likewise has a fixed axis, is arranged. Wa In order to press the ear against the measuring wheel, an opposing roller is also attached to the balance rod 4. 6 is provided. The weighing rod 4 is shaped inside the weighing rod, especially as can be seen from Figure 3. It can be lifted with a pin 8 fixed to the housing through the elongated hole 7 formed. , can be rotated around pin 8 at the same time. The scale rod is further housed at one end by wing 9. It is fixed to the ring 31. Below the weighing rod, there is a stand 11 that pushes the lower side of the weighing rod 4. A pressurizing cylinder 10 is arranged. [Table] The point of action on the scale pole of 1 is along the scale pole. Therefore, by being able to adjust the pressurizing cylinder 10 in the direction of the arrow 12 along the balance rod, It can be changed. Only the flames shown in Figures 2 and 3 should be used. The wire 13 is led to the back side of the housing 31 through the opening 14, and A wire guide device 15 is held within this opening, the wire guide device 15 being eccentrically adjustable depending on the thickness. ing. The wire is guided into a gas head 16 located at the front side of the housing. This gas head is connected via a conduit 17 to heat and heat the dusted material of the wire. Various gases can be introduced as transport gases. Gas head 16 is a gas head holder 18, this holder is guided in two elongated holes ]9, and is screwed by a male screw 20. Can be adjusted vertically. Wire thickness varies by adjusting the gas head. When the wire is moved, it can be adapted to changes in the position of the central longitudinal axis of the wire.

As can be seen from FIG. 3, the opposing roll 3 and opposing shaft 6 are adjusted by adjusting the balance rod 4 , in the vertical direction of FIG. 3, can be adapted to wires 13 of different diameters. Change In FIG. 3, two driving wheels 21 and 22 are shown, which are connected to driving wheel 2 or 2. or on the axis of the opposing roll 3 and connected thereto. The driving wheel is It serves to drive the opposing rolls 3 simultaneously. Although it is not clearly shown in Figure 3, , the measuring wheel 4 and the countershaft 6 can be provided with corresponding drive wheels.

FIG. 2 schematically shows a system for controlling and regulating the feed rate of the wire 13. this For this purpose, the motor 1 is fitted with a tachometer 23, which sends information regarding the motor speed to the microprocessor 25 via line 24. and is communicated via line 26 to control circuit 27.

The gradual rotation applicator is connected to the measuring wheel 4 and when the wire 13 is moved in the longitudinal direction Then, a corresponding digital signal is provided to the microprocessor 25. Finally, Mike A pressure control 29 is provided which is connected to the processor 25 and which is connected to the conduit. It is connected to the pressurizing cylinder 10 via 33.

The device of the invention operates as follows: The wires to be flamed are connected to each other on the back side of the housing 31 through the opening 14. between the opposing measuring wheel 5 and the opposing shaft 6 and between the driving wheel 2 and the opposing roll 3. It is guided and sent to the front gas to the RAD 16. The scale rod 4 can be adjusted vertically. Therefore, wires of different diameters can be processed on the drive shaft 2 and the fixed shaft of the measuring wheel 5. However, the drive wheel and measuring wheel may not be replaced depending on the wire thickness. It's okay. However, in such an arrangement, the position of the central length axis of the wire Since the position changes in relation to the wire thickness, the wire guide opening 15 has a corresponding adjustment. By adjusting the screw 20, the center length of the wire can be adjusted. adapted to the horizontal axis. After the wire is introduced, a corresponding pressure is applied to the pressure cylinder 10. applied, whereby the weighing rod 4 is lifted and the opposing roll and opposing shaft 3 or 6 is pressed against the underside of the wire, and the wire presses against the driving or measuring wheel. Ru.

The pressure that presses the opposing roll 3 or the opposing shaft 6 against the wire is applied here. Various selections can be made by moving the cylinder 10 along the arrow 12. , whereby the point of action of the pressurized cylinder base 11 moves along the balance rod.

Conventional conventional control of the feed rate of the wire 13 is, for example, coupled to the drive shaft of a motor. A predetermined feed rate is set for each rotation speed of the motor and its known range by the drive wheel 2. This was done by determining the By controlling the rotation speed of motor 1 in this way, the The feed rate of the roller was determined. However, as is known, the driving wheel 2 and the Slippage often occurs between wires, and this slippage can be prevented by controlling the wire feed speed as described above. In , it is not revealed by this device itself. Therefore, something like this In some cases, the wire is guided through the gas head with varying feed rates. As a result, the coating This results in defects in the coating on the surface to be covered.

The cause of such defects is the measuring wheel 5 and the gradual rotation applicator 2 connected to the measuring wheel. 8, by directly detecting the actual feed rate of the wire 13. Ru. The signal obtained by the stepped rotation applicator 28 indicates the current value of the wire feed rate. is given to the microprocessor 25 as a. Therefore, control is performed by a microprocessor. This is done by giving a predetermined feeding speed of the wire to the sensor as a predetermined value. wire The difference between the set scheduled value of the feed rate and the current value detected by the measuring wheel 5. Depending on the difference value revealed, the microprocessor is then sent via the control circuit 27. The rotation speed of the motor 1 is controlled by the sensor 25 . Despite the presence of false signals, all That is, the adjusted schedule of the feed rate caused by the increase in the motor rotation speed of motor 1 Despite the existence of a difference between the value and the current value, this increase does not occur and the wire feed rate It was found that a corresponding fit of the degree of rotation can be obtained. This means the existence of a disturbance that cannot be compensated for by controlling the

According to the invention, most of these faults consist in slipping of the drive wheels 2. Therefore this For this reason, according to the present invention, the microprocessor 25 in such a malfunction state is Upon verification, a control signal is given to the pressure control device 29, which Via 33, the pressure in the pressure cylinder 10 is increased. In this way, the balance rod 4 Then, increased pressure is applied to the opposing roll 3 and the opposing shaft 6. The obstacle is the driving wheel 2, and as long as it is removed by controlling the pressing force of the opposing roll 3, the feed rate Further control of the speed can be achieved by conventional control of the rotational speed of the drive motor 1.

A working diagram for such a control implementation is shown in FIG.

In the same figure, aN = the set scheduled value of the wire feed rate and the measured current value. It is the difference between The scheduled value of the wire feed rate is set at 40, and the corresponding current value and Continuously compared. 41, if a N=O is confirmed, further No control measures are taken. If not, first, according to 41, whether a, < O Please ask questions. In that case, corresponding control measures are taken and the motor The rotational speed is reduced. However, if neither aN=O nor aN<O, then a N>O, and in this case, the motor rotation speed is increased by control by 44. . 45, continuous error signals aN and aN, □I When the difference decreases, this means that the control measures introduced have worked and that only 4 6, it is determined whether aN=Q. If not, further mode The motor rotation speed is increased. However, between consecutively measured feed rates 4 If there is a difference due to 5 and the error value aN does not become small, the corresponding value is A control signal is issued, and the pressing force of the opposing roll 6 is increased as described above. Communicating When the subsequently measured difference a and aN-1 are wanted immediately next, an error occurs. If a decrease in the difference value is confirmed at 48, this clearly indicates that there is slippage and this exclusively through 49, the error value a becomes O, or in some cases further It is checked whether the pressing force of the lever 3 has to be increased via 47.

When the false signal a8 cannot be reduced even when the pressing force of the opposing roll 3 is further increased. In the next control step, it is further determined by 50 whether the false signal is already 0 or not. Fl! I approve. In this case, depending on 51, if a, <Q? Inspect whether

In that case, the motor rotation speed is reduced via 43. If not, update A control signal is provided to increase the motor rotation speed via control by 52.

Upon subsequent exploration, a decrease in the false signal aN is confirmed by 53, when the false signal is already O. It is checked via 54 whether or not this is the case. False signal a due to exploration 53 When no reduction in H is confirmed, this means that the error is also reached by the removal of slip. means that it cannot be achieved. i.e. there are other defects that are not easily visible This defect must then cause the automatic stop of the wire feed as a whole by 55. It is something that brings.

Furthermore, in order to limit defects that cannot be easily seen, 55 is a current receiver of the drive motor 1. (Fig. 1), and this monitoring is performed using mechanical components (wire guides, wire guides, etc.). wire reel, etc.). This monitoring works constantly and furthermore clearly detects errors. Can give notice.

The controls possible with 43.44 and 47 are related to wire diameter and wire feed rate. This gives a narrow limit value. If this limit value is exceeded, a clear error signal will be displayed Ya feed is cut off.

international search report PCT/EP　89100888

Claims (1)

[Claims] 1. Drive wheel (2) for wire driven by motor (1) and drive wire Feed device and wire for wire (17) with opposing rolls (3) pressing against the ring In a wire pistol equipped with a device to control the feed rate, the current value of the feed rate Equipped with a wire contact measuring wheel (4) for measuring the wire speed and controlling the wire feeding speed. The device changes the pressing force of the facing roll, and the control device changes the action exerted on the motor drive. characterized in that it is associated with and includes a predisposition that is not regulated by use; wire pistol. 2. It is characterized by comprising an opposing wheel (6) that presses the wire against the measuring wheel (4). A wire pistol according to claim 1. 3. Counterroll (3) for the drive wheel (2) and counterwheel for the measuring wheel (4) (6) is housed in the weighing rod (7), and that the opposing roll (3) and and a pressing device (5) for pressing the opposing ring (6) onto the wire via the scale rod (7). The wire pistol according to claim 2, characterized in that: 4. The scale rod (5) is connected to the wire pistol housing (8a) via the operating rod (20). 4. The wire pistol according to claim 3, wherein the wire pistol is connected to a wire pistol. 5. It is characterized in that the point of action of the pressing device (5) can be adjusted along the balance rod (7). A wire pistol according to claim 3 or 4. 6. Claim characterized in that the pressing device (5) is designed as a pressure cylinder. The wire pistol according to any one of items 3 to 5. 7. characterized in that the measuring wheel (4a) is connected to a stepwise rotation applicator (16). The wire pistol according to any one of claims 1 to 6. 8. A pressure change control device is provided in the pressurizing cylinder (5). The wire pistol according to claim 6 or 7. 9. Particularly, the drive voltage is supplied to the control circuit for regulating the motor (1a). The wire pistol according to any one of claims 1 to 8, characterized in that: 10. The motor (1a) is equipped with a tachometer (15) for measuring the motor rotation speed. The wire pistol according to any one of claims 1 to 9, characterized in that: 11. be equipped with a microprocessor system for detecting control signals; The wire pistol according to any one of claims 1 to 10, characterized in that: 12. The input side of the microprocessor system is the rotation giver (16) and the tachometer. The wire piston according to claim 11, characterized in that the wire piston is connected to a motor (15). Le. 13. A microprocessor system controls the pressure during pressurization on the input and output sides. Connected to the force change control device and provides drive back pressure to the control circuit for motor regulation. The wire pistol according to claim 11 or 12, characterized in that: 14. Any one of claims 1 to 13, wherein the motor (1) is a DC motor. The wire pistol according to item 1. 15. To control the feed rate, the DC motor (1) is equipped with a variable impulse width and be capable of supplying continuous drive voltage impulses with variable impulse periods and/or variable impulse periods. The wire pistol according to claim 14, characterized in that: 16. Equipped with a transmission device for transmitting the drive of the drive wheel (2) to the opposing roll (3) The wire pistol according to any one of claims 1 to 15, characterized in that: 17. A transmission device is connected concentrically with the drive wheel (2) or the counter roll (3), respectively. Claim 1 characterized in that it is constituted by gears (18, 19) connected together. 6. The wire pistol according to item 6. 18. The teeth of the gear have shape I according to DIN 3972 for nine teeth. 18. The wire pistol of claim 17.