TWI689457B - Air injection mechanism and parts feeder - Google Patents

Abstract

Provide digitally managed compressed air flow or pressure, and An air injection mechanism that prevents operating efficiency from decreasing.

The air injection mechanism (1) of the present invention A plurality of workpieces (W) sequentially injecting compressed air is configured to include: a flow rate adjustment means (3A), which is connected to a compressed air source (11), and has a two-port valve (3) that can continuously change the opening and closing amount; The host controller (4), which outputs parameters suitable for the type of workpiece (W); and the piezoelectric valve driver (5), which proportionally controls the two ports according to the applied voltage corresponding to the parameters output by the host controller (4) The opening and closing amount of the valve (3).

Description

Air injection mechanism and parts feeder

The invention relates to an air injection mechanism and a component feeder that can digitally control the flow or pressure of compressed air.

In the past, there has been known a part feeder that performs posture determination of workpieces (wafers) such as electronic parts on the conveying path, to remove workpieces with incorrect posture from the conveying path or to reverse the posture on the conveying path to correct the posture, and It is possible to transport a workpiece with a correct posture to a predetermined supply target (for example, Patent Document 1).

Such a part feeder, as shown in FIG. 7, for example, is suitable for a regulator 12 connected to a compressed air source 11, a three-port valve 700 arranged downstream of the regulator 12, and a downstream of the three-port valve 700. The air injection mechanism 15 of a needle valve (speed controller, hereinafter also referred to as "speed governor") 50 with a check valve is usually used to eliminate or posture a workpiece W with an incorrect posture (bad workpiece W') Correction.

The regulator 12 adjusts the pressure of the compressed air supplied from the compressed air source 11 to be constant (reduced pressure).

Three-port valve 700, equipped with: communicating with regulator 12 outlet The first port 107a, the second port 107b that communicates with the air supply and exhaust path 21 of the component feeder 2 through the needle valve 50 with a check valve, and the third port 107c that communicates with the atmospheric area . The three-port valve 700 communicates with the second port 107b and the third port 107c through the passage 171 in the short tube 170 when it is not energized, and blocks the first port 107a and the second port 107b, so that The compressed air supplied from the regulator 12 is closed near the first port 107a. On the other hand, the short tube 170 is displaced when energized, and the first port 7a and the second port 107b are communicated through the passage 173 in the short tube 170 to supply the compressed air supplied by the regulator 12 to the unit. The needle valve of the check valve (hereinafter also referred to only as "needle valve") 50.

The needle valve 50 with a check valve adjusts the flow rate of compressed air to supply a predetermined flow rate of compressed air to the air supply and exhaust path 21 of the component feeder 2. In addition, when the needle valve 50 with a one-way valve switches the energization of the three-port valve 700 to OFF to generate a reverse flow of compressed air, a free flow is generated on the side of the one-way valve 51, and the compressed air can be directed toward the three-port The valve 700 flows.

In the component feeder 2 using the air injection mechanism 15 as described above, the workpiece W is detected by the sensor 65, and the sensor amplifier 68 with a judging function is used when the defective workpiece W'reaches the predetermined processing position P A signal is output to apply a voltage to the solenoid valve 172 of the three-port valve 700 to open and close the three-port valve 700 (ON, OFF), and to inject compressed air from the air supply and exhaust path 21 to the defective workpiece W'at the processing position P, whereby The defective workpiece W'is excluded from the transport path 20 or reversed on the transport path 20.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-30566

However, due to the size of the workpiece W, the flow rate or pressure of the compressed air suitable for reversing or excluding is different in the part feeder 2, so it is considered to adjust the needle valve 50 to make the flow rate and pressure and the target The opening time of the workpiece W and the three-port valve 700 match.

At this time, the adjustment of the needle valve 50 is to use a scale-type speed controller, or to use a flow sensor or a pressure sensor, and it is better to use a digital management to reproduce, but when fine adjustment is made, the scale type The governor cannot be adjusted properly. Moreover, with the miniaturization of the workpiece W in recent years, the flow rate or pressure of the most suitable compressed air has also been miniaturized (decreased), so the flow sensor or pressure sensor cannot be accurately detected when the measured value is too small (flow sensor Sensor or pressure sensor becomes difficult).

Therefore, in order to match the operation status of the target workpiece W, the needle valve 50 is generally adjusted manually. However, if fine adjustment is performed manually, the reproducibility of the same setting is low because it is adjusted by feeling . Therefore, even if the needle valve 50 is readjusted according to the type of each workpiece W, it cannot return to the original setting value, and there is a problem that the flow rate or pressure of the compressed air cannot be properly managed.

In addition, although there are multiple types (types) of work W The multiple types that flow in the same part feeder 2 correspond to each other. However, in the structure where the air injection mechanism 15 is applied, it is necessary to exchange and adjust the type of the workpiece W in advance each time the type of the workpiece W being conveyed changes. The needle valve 50 has to be readjusted every time, so there is a problem of poor work efficiency.

The purpose of the present invention is to effectively solve the above-mentioned problems, and to provide an air injection mechanism and a component feeder, which can digitally manage the flow rate or pressure of compressed air and prevent a reduction in operating efficiency.

In view of the above problems, the present invention adopts the following means.

That is, the air injection mechanism of the present invention injects compressed air sequentially toward a plurality of objects to be injected, and is characterized by having a flow rate adjustment means connected to the compressed air source and having a switching valve that can continuously change the opening and closing amount ; Parameter output means, which outputs a parameter suitable for the type of object to be injected; and proportional control means, which proportionally controls the opening and closing amount of the switching valve according to the applied voltage or applied current corresponding to the aforementioned parameter.

If configured as described above, the applied voltage or applied current of the switching valve included in the flow rate adjusting means is set according to the parameters output by the parameter output means, and the applied voltage or applied current can be used to control the The opening and closing amount is proportionally controlled, so the flow rate or pressure of the compressed air output from the switching valve can be set to suit the type of the object to be injected. Therefore, the flow rate of the compressed air output by the switching valve can be appropriately It is finely adjusted and has the same set of reproducibility, which can accurately manage the flow or pressure of compressed air injected by the air injection mechanism digitally. In addition, in the case of multiple types of correspondence, it is not necessary to replace the switching valves with different settings each time the type of the object to be transported is changed each time, which can prevent a decrease in work efficiency.

In particular, in order to improve the reactivity of the compressed air injection, the switching valve is preferably a piezoelectric valve.

In particular, in the case of a part feeder suitable for injecting compressed air to a defective workpiece at a predetermined processing position among the workpieces transported along the conveying path, in order to inject the defective workpiece at a suitable time at the appropriate type The compressed air of the flow rate or pressure is provided with a time point obtaining means for finding the time point when the defective workpiece reaches the processing position, and the parameter output means is configured to output a parameter suitable for the type of workpiece being conveyed, and the proportional control means, It is preferable that a voltage corresponding to the parameter is applied to the switching valve at the time point obtained by the time point obtaining means.

Or, it is provided with a time point obtaining means for obtaining the time point when the defective workpiece reaches the processing position, and the parameter output means is configured to have an input section that can input data about the type of workpiece being transported, and according to the input section The input data is used to generate the parameter and output. The proportional control means is configured to apply a voltage corresponding to the parameter to the switching valve at a time point obtained by the time point obtaining means.

In order to inject compressed air, the aforementioned switching valve is necessary In order to have at least a first port that communicates with the compressed air source, and a second port that communicates with the air supply and exhaust path formed in the conveying path, the first port and the second port can be Two or more switching valves for switching between the communication position in the communication state and the non-communication position in which the first port and the second port are in a non-communication state. In particular, in order to make the pressure drop of the compressed air faster and make the injection of the compressed air more responsive, the switching valve further includes a third port that communicates with the atmospheric area, and the first port A three-port switching valve for switching between the communication position communicating with the second port and the atmosphere opening position of the non-communication position communicating with the second port and the third port is preferable.

In addition, in order to realize accurate digital management of the flow or pressure of the compressed air to be injected, and to prevent the reduction of work efficiency in the case of multiple types of correspondence, the component feeder is configured to use the above air injection mechanism to It is better to spray compressed air on the defective workpiece conveyed along the conveying path to remove the defective workpiece from the conveying path or reverse the posture on the conveying path to change the posture.

According to the present invention described above, one switching valve can be used to finely adjust the flow or pressure of compressed air, and has the same set of reproducibility, which can accurately manage the flow or pressure of the injected compressed air digitally. In addition, In the case of multiple types of correspondence, there is no need to change the switching valves that have different settings depending on the type of the object to be transported, and it is possible to provide an air injection mechanism and a parts feeder that can prevent a decrease in work efficiency.

1: Air injection mechanism

2: Parts feeder

3: Two-port valve (switching valve, piezoelectric valve)

3a: Port 1

3b: 2nd port

3A, 3B: Flow adjustment method

4: Host controller (parameter output means)

5: Piezo valve driver (proportional control means, parameter output means)

5’: Solenoid valve driver (proportional control means)

6: Image processing device (time acquisition means, parameter output means)

7: Three-port valve (switching valve, piezoelectric valve)

7a: Port 1

7b: 2nd port

7c: Port 3

10: Air circuit

11: Compressed air source

12: Regulator

13a: No. 1 air piping

13b: Second air piping

13c: The third air piping passes

20: Transport road

20a: side wall

21: Air supply and exhaust path

30: Actuator

32: Power input section

33: Switching section

51: Communication input and output

52: Setting input section (input section)

53: Applied voltage setting section

54: Command input section

55: output control unit

56: Voltage output circuit

61: Image processing department

62: Image Discrimination Department

63: Command Department

64: Driver setting section

65: Camera

68: sense amplifier (time point acquisition means)

P: processing position

R: connected position

L: Occlusion position (non-connected position)

N: Atmospheric open position (non-connected position)

W: Workpiece (shot object)

W’: bad workpiece

FIG. 1 is a schematic diagram showing a state where an air injection mechanism according to an embodiment of the present invention is applied to a component feeder.

FIG. 2 is a schematic view partially showing an air injection mechanism when compressed air is injected.

FIG. 3 is a diagram showing a modification of the present invention.

4 is a diagram showing another modification of the present invention.

FIG. 5 is a diagram showing another modification of the present invention.

6 is a diagram showing another modification of the present invention.

7 is a diagram showing a conventional structure.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the air injection mechanism 1 according to an embodiment of the present invention is applied to a component feeder 2. The part feeder 2 conveys a plurality of workpieces, that is, workpieces W, along the conveying path 20, and determines the posture of the workpiece W based on the image data obtained by the camera 65 that photographs the workpiece W being conveyed To judge good or bad, the defective workpiece W′ judged to be bad is excluded from the transport path 20 at the processing position P set downstream of the camera 65 in the transport direction or reversed on the transport path 20 to correct the posture . The conveying path 20 penetrates the side wall 20a to form an empty space The air supply and exhaust passage 21 and the air injection mechanism 1 inject compressed air toward the processing position P through the air supply and exhaust passage 21. In this case, in this embodiment, the type of workpiece W to be transported is specifically It is said that the compressed air suitable for the flow rate or pressure of the workpiece W type is used to handle the defective workpiece W'.

The air injection mechanism 1 includes an air circuit 10, a host controller 4, an image processing device 6, and a piezoelectric valve driver 5.

The air circuit 10 is provided with a regulator 12 connected to a compressed air source 11 (factory equipment) to decompress the compressed air supplied by the compressed air source 11 to a certain value; the two-port valve 3 is arranged in the regulator 12 Downstream of, the flow rate of compressed air decompressed by the regulator 12 is adjusted. The compressed air source 11 and the regulator 12 are connected by the first air piping passage 13a, the regulator 12 and the two-port valve 3 are connected by the second air piping passage 13b, and the two-port valve 3 and the air supply and exhaust passage The 21 series is connected by the third air piping 13c. In this embodiment, the two-port valve 3 constitutes the flow rate adjustment means 3A.

The two-port valve 3 as a switching valve includes: a first port 3a communicating with the outlet of the regulator 12 which is the second air piping passage 13b; and a parts feeder which is communicating with the third air piping passage 13c 2 is the second port 3b in which the air supply and exhaust passage 21 communicates. The two-port valve 3 is configured to allow the first position 3a and the second position 3b to close the closed position L shown in FIG. The first port 3a and the second port 3b are switched between the communication positions R shown in FIG. 2 in which the inside communicates.

This switching is performed by energizing (applying a voltage) the power input portion 32 included in the two-port valve 3, and displacing the actuating portion 30. When the power input portion 32 is not energized, it becomes the blocking position L shown in FIG. The compressed air supplied from the regulator 12 to the two-port valve 3 is closed near the first port 3a. On the other hand, when the power input section 32 is energized, the actuating section 30 is displaced to become the communication position R shown in FIG. 2, and the compressed air supplied from the regulator 12 is input from the first port 3 a and passes through the switching section 33 is output from the second port 3b to supply air to the air supply and exhaust passage 21. Thereby, compressed air is injected from the air supply and exhaust passage 21 toward the processing position P. Then, when the energization to the power input unit 32 is stopped, the actuating unit 30 is displaced toward the original position and returns to the blocking position L shown in FIG. 1, and the injection from the air injection circuit 10 is stopped.

Moreover, the displacement amount of the actuating portion 30, that is, the opening and closing amount (opening amount) of the two-port valve 3 can be continuously changed due to the voltage applied to the power input section 32, and the opening and closing amount with respect to the applied voltage is specific, so The flow rate and pressure of compressed air supplied from the air supply and exhaust passage 21 are adjusted. In addition, the two-port valve 3 is a piezoelectric valve that uses a piezoelectric element as a driving source, for example, the reactivity after applying a voltage is faster (high-speed response) compared to a solenoid valve or a proportional valve.

The host controller 4 as a parameter output means maintains various parameters set by the driver suitable for the type of work W, specifically, the drive suitable for the type of work W, and is most suitable for the type of work W transported on the transport path 20 The parameters are output to the image processing device 6.

The image processing device 6 includes a driver setting unit 64, The system outputs the parameters output from the host controller 4 to the communication input/output unit 51 of the piezoelectric valve driver 5; the image processing unit 61 processes the image data obtained by using the camera 65; the image discrimination unit 62, It is determined whether the posture of the workpiece W is good based on the data processed by the image processing section 61; and the instruction section 63 is to reach the processing position P of the defective workpiece W′ of the workpiece W determined to be defective by the image discrimination section 62 The data related to the time point (time point data) is output to the command input unit 54 of the piezoelectric valve driver 5 as a reverse-rotation command. The time point at which the defective workpiece W'reaches the processing position P is obtained, for example, from the transport speed of the defective workpiece W'calculated using the aforementioned image data, and the image processing device 6 is also used to obtain the defective workpiece W' The point-in-time acquisition means at the time point of processing the position P functions.

The piezoelectric valve driver 5 as a proportional control means, when inputting parameters through the communication input/output section 51, extracts various data about proportional control for each parameter, for example, from the applied voltage setting section that holds the applied voltage of each parameter in advance 53 Take out the corresponding applied voltage and set the applied voltage to the two-port valve 3 (proportional control). Similarly, through the applied voltage setting unit 53, the signal synchronous output to the command input unit 54 is also set ‧ the switching of the one-shot output, the setting of the voltage output waveform of the high value, the low value, etc., the setting of the one-shot pulse time, the command Parameters such as the normally closed and normally open switching of the input part 54 or the mechanism of the two-port valve 3

In addition, the piezoelectric valve driver 5 applies the power input unit 32 of the two-port valve 3 through the output control unit 55 and the voltage output circuit 56 based on the time data input from the command unit 63 through the command input unit 54. The voltage set by the applied voltage setting unit 53. As described above, when the workpieces W of the same type are transported, the feedback control of the applied voltage is not performed for each injection of compressed air, but is determined by the applied voltage, thereby making the injection more reactive. .

In the above-described structure, when the workpiece W starts to be transported, the host controller 4 outputs a parameter suitable for the type of the workpiece W to the piezoelectric valve driver 5 through the driver setting section 64, and sets the type for the workpiece W by the applied voltage setting section 53 It is most suitable to apply voltage and so on. The image processing device 6 is based on the image data obtained by using the camera 65 to determine whether the posture and the like of the workpiece W are good in the image determination unit 62, and finds the time point when the defective workpiece W'reaches the processing position P and transmits The command unit 63 outputs the time point data to the piezoelectric valve driver 5. The piezoelectric valve driver 5 applies the applied voltage to the power input section 32 of the two-port valve 3 between the one-shot pulse time set by the applied voltage setting section 53 each time the time point data is input through the command input section 54 . In addition, when the output is set to be synchronized, an input voltage is applied to the input unit 32 between signals output from the command unit 63 of the image processing device 6.

The two-port valve 3 continuously displaces the actuating portion 30 in response to the application of voltage to output compressed air at a flow rate and pressure most suitable for the workpiece W type. The compressed air output from the two-port valve 3 passes through the air supply and exhaust passage 21 to reach the defective workpiece W to appropriately remove the defective workpiece W from the conveying pathway 20 or to reverse it properly on the conveying pathway 20 to change posture. As described above, the compressed air is sprayed at the flow rate and pressure most suitable for the W type of work piece, thereby, for example, the alignment capability of the component feeder 2 can be maintained at a good level status.

As described above, the air injection mechanism 1 of the present embodiment injects compressed air in sequence toward a plurality of workpieces to be injected, that is, the workpiece W, and is configured to include flow rate adjustment means 3A, which is connected to the compressed air source 11, and A two-port valve 3 with a switching valve that can continuously change the opening and closing amount; a higher-level controller 4 as a parameter output means whose output is suitable for the type of work W, specifically a parameter suitable for the type; and a piezoelectric as a proportional control means The valve driver 5 proportionally controls the opening and closing amount of the two-port valve 3 according to the applied voltage of the corresponding parameter.

In the case of the above structure, the applied voltage is set to the two-port valve 3 included in the flow rate adjustment means 3A according to the parameters output from the host controller 4, and the applied voltage can be used to proportionally control the two-port valve with the piezoelectric valve driver 5 Since the opening and closing amount of 3, the flow rate or pressure of the compressed air output from the two-port valve 3 can be set to suit the type of work W. Therefore, the flow rate of the compressed air output by the two-port valve 3 can be appropriately fine-adjusted, and has the same setting reproducibility, and the flow rate or pressure of the compressed air injected by the air injection mechanism 1 can be digitally managed accurately. Moreover, in the case of multi-type correspondence (when multi-type common parts feeder), it is not necessary to replace the two-port valve 3 with different settings every time the type of the workpiece W to be transported is changed, which can make the switching operation more efficient. Prevent the reduction of work efficiency.

In particular, since the two-port valve 3 is a piezoelectric valve, the responsiveness of compressed air injection can be improved.

In addition, it is suitable for ejecting a compressed air at a predetermined processing position P among the workpieces W transported along the transport path 20 at a predetermined processing position P The gas parts feeder 2 is provided with an image processing device 6 which is a time point acquisition means for finding the time point when the defective workpiece W'reaches the processing position P, and the upper controller 4 is configured to output a suitable output The parameter of the workpiece W type, the piezoelectric valve driver 5 is configured to apply a voltage corresponding to the parameter to the two-port valve 3 at the time point obtained by the image processing device 6, so that it can be based on the output from the upper controller 4 The parameters are used to proportionally control the opening and closing amount of the two-port valve 3, and the piezoelectric valve actuator 5 can be used to inject compressed air suitable for the flow rate and pressure of the workpiece W to the defective workpiece W'at an appropriate time.

The switching valve needs to be provided with: a first port 3a communicating with the compressed air source 11 and a second port 3b communicating with the air supply and exhaust path 21 formed in the conveying path 20, and the first The communication port R where the communication port 3a and the second communication port 3b are in the communication state, and the two ports that switch between the non-communication position, that is, the non-communication position that is the non-communication state of the first communication port 3a and the second communication port 3b Valve 3 is a switching valve with more than two ports. In addition, as will be described later, the switching valve system further includes a third port valve that communicates with the atmospheric area, and becomes a communication position that allows the first port to communicate with the second port, and the second port The three-port switching valve that switches between the non-connecting position that is communicated with the third port, that is, the atmosphere opening position, can make the pressure of the compressed air fall faster and make the injection of the compressed air more responsive.

Furthermore, the component feeder 2 is configured to use the air injection mechanism 1 of the present embodiment to inject compressed air to the defective workpiece W′ transported along the transport path 20 to exclude the defective workpiece W′ from the transport path 20 or Reversing on the conveying path 20 to change the posture, so you can use a two-port valve 3 Finely adjust the flow or pressure of the injected compressed air, and have the same set of reproducibility, can accurately manage the flow and pressure of the injected compressed air, and in the case of multiple types of correspondence, there is no need to transfer the workpiece W Each time the product type is changed, the two-port valve 3 with a different setting must be replaced to prevent a reduction in operating efficiency.

Although one embodiment of the present invention has been described above, the specific structure of each part is not limited by the above embodiment. In the following, the same symbols are attached to the same ones as the aforementioned structures, and the description is omitted.

For example, in this embodiment, different parameters according to the type of each workpiece W are output from the upper controller 4, but as shown in FIG. 3, it may be configured to output the type data of the transferred workpiece W from the upper controller 4. (Only the controller 4 specifies the type). In this case, the image processing device 6 is considered to have a parameter setting section 66 configured to hold parameters suitable for the data of each type. The parameter setting section 66 allows the piezoelectric valve to be set by the driver setting section 64. The driver 5 outputs parameters suitable for the variety data output by the host controller 4. In this structure, the image processing device 6 constitutes parameter output means.

Moreover, it is not limited to the structure for outputting parameters from the upper controller 4, and as shown in FIG. 4, it may be configured such that the setting input section 52, which is an input section provided in the piezoelectric valve actuator 5, can be manually input The data of the transferred workpiece W type (panel input) generates parameters suitable for each type from the data input by the setting input unit 52, and the applied voltage setting unit 53 sets the applied voltage and the like. Also, in this structure, the piezoelectric valve drives The actuator 5 constitutes parameter output means. Furthermore, the camera 65 and the image processing device 6 may be replaced with a structure using a sensor 67 and a sense amplifier 68 with a determination function. The structure shown in FIG. 4 is such that the sensor 67 detects the workpiece W, and based on the detection result of the sensor 67, the time point acquisition means for obtaining the time point at which the defective workpiece W'reaches the processing position P is also obtained That is, the sense amplifier 68 outputs an exclusion reverse command to the command input unit 54, and each time the exclusion reverse command is input to the command input unit 54, the set applied voltage is applied to the two-port valve 3 through the applied voltage setting unit 53.

As described above, it is suitable for a component feeder 2 that injects compressed air at a predetermined processing position P on a defective workpiece W′ transported along a conveying path 20, and is provided with a time for the defective workpiece W′ to reach the processing position P The sense amplifier 68, which is a point-in-time acquisition means, and the piezoelectric valve driver 5, which is a parameter output means, have a setting input section 52, which is an input section that can input variety data about the workpiece W to be transported, and is configured as The aforementioned parameters are generated and output based on the data input from the setting input section 52. The piezoelectric valve driver 5 is configured to apply a voltage corresponding to the aforementioned parameters to the two-port valve 3 at the time point obtained by the sense amplifier 68, so The opening and closing amount of the two-port valve 3 can be proportionally controlled according to the data input by the setting input section 52, and the piezo valve actuator 5 can be used to eject the flow rate or pressure suitable for the workpiece W type at the appropriate time point to the defective workpiece W' Compressed air.

In addition, in the structure shown in FIG. 4, instead of the sense amplifier 68 having a determination function, a sense amplifier and a programmable controller having no determination function may be used.

In addition, although the two-port valve 3 is used as the switching valve included in the flow rate adjustment means 3A in the above embodiment, the three-port valve 7 as shown in FIG. 5 may be used. Alternatively, more than four ports can be used.

The three-port valve 7 includes: a first port 7a communicating with the second air piping passage 13b, that is, the outlet of the regulator 12, and a third air piping passage 13c, that is, the air supply and exhaust of the part feeder 2 The second port 7b communicating with the path 21; and the third port 7c communicating with the atmospheric area. The three-port valve 7 is configured to allow the first port 7a and the second port 7b to communicate internally through the switching section 73 of the actuator 70 when the power input section 32 is energized, as shown in FIG. 5(b) At the position R, and when the power input unit 32 is not energized, the switching unit 71 of the actuating unit 70 internally communicates the second port 7b and the third port 7c and makes the first port 7a and the second port 7b The non-connected position shown in the same figure (a), which is the non-connected state, is switched between the atmosphere open position N.

In the atmosphere opening position N shown in FIG. 5(a), the compressed air supplied from the regulator 12 to the three-port valve 7 is closed near the first port 7a, and the second port 7b is opened to the atmosphere. On the other hand, at the communication position R shown in (b) of the figure, the compressed air supplied from the regulator 12 is input from the first port 7a and passes through the switching section 73 and is output from the second port 7b. The air supply and exhaust path 21 supplies air. Thereby, compressed air is injected from the air supply and exhaust passage 21 toward the processing position P.

Then, when the energization to the power input unit 32 is stopped, the actuation unit 70 will be displaced toward the original position and return to the atmosphere opening position N shown in (a) of the same figure. At this time, the third air piping passage 13c Residual pressure, The air supply and exhaust passage 21 is opened to the atmosphere, and the second port 7b of the three-port valve 7 passes through the switching section 71 and is opened to the atmosphere through the third port 7c. Therefore, immediately after returning the three-port valve 7 from the communication position R shown in FIG. 5(b) to the atmospheric opening position N shown in the same figure (a), the three-port valve 7 and the part feeder 2 are supplied with air. The residual pressure in the third air piping between the exhaust passage 21 and the passage 13c is appropriately opened to the atmosphere from both the air supply and exhaust passage 21 and the three-port valve 7, so that the pressure of the compressed air can be reduced quickly.

As described above, the switching valve includes at least the first port 7a communicating with the compressed air source 11; the second port 7b communicating with the air supply and exhaust path 21 formed in the conveying path 20; and the atmosphere area The third port 7c communicating with each other, and at the communication position R that allows the first port 7a and the second port 7b to communicate, and the second port 7b to communicate with the third port 7c and the first port 7a The three-port valve 7 with three or more ports to switch between the non-connected position that is the non-connected state of the second port 7b, that is, the atmosphere opening position N, the residual pressure in the third air piping passage 13c after injection will be removed from the air The air supply and exhaust passage 21 is open to the atmosphere, and the second port 7b of the three-port valve 7 passes through the switching section 71 and is opened to the atmosphere through the third port 7c. Therefore, the injected exhaust gas is discharged from the air supply and exhaust passage 21 With both of the three-port valve 7, the pressure drop of the compressed air jet can be accelerated to further increase the pressure air reactivity.

Furthermore, in the above-described embodiment, although the normally-closed three-port valve 7 that is opened to the atmosphere when the power input section 32 is not energized is used as described above, it can also be used in a closed state when the power input section 32 is not energized. 状的 normally open three-port valve 7. Switching between normally open and normally closed can be performed by the applied voltage setting unit 53 shown in FIG. 4 and the like.

In addition, in the above-described embodiment, although the upper controller 4 outputs the parameters different according to the type of the workpiece W, the upper controller 4 may be configured to output the parameters different depending on the type and batch. Even if the workpiece W is of the same type, because the shape and surface friction of each batch will be slightly different, so even if the same setting, there will be a difference in the reverse action and the elimination action, and there is a part feeder 2 The possibility of lowering the alignment capacity of the machine can be configured to output different parameters according to the type and batch of the workpiece W, and the flow rate or pressure of the injected compressed air can be further optimized.

Furthermore, in the above embodiment, instead of the two-port valve 3 or the three-port valve 7, a proportional valve 75 as shown in FIG. 6, that is, a proportional valve 75 and a high-speed electromagnetic valve connected to the proportional valve 75 via a passage 13d through the air piping Valve 76. That is, the flow rate adjustment means 3B may be constituted by the proportional valve 75 and the solenoid valve 76. In this structure, the solenoid valve driver 5 ′, which is a proportional control means having almost the same structure as the piezoelectric valve driver 5 described above, applies current to the coil of the proportional valve 75 (not shown) to proportionally control the opening and closing of the proportional valve 75 The flow rate or pressure of the compressed air output from the proportional valve 75 is digitally controlled, and the solenoid valve driver 5'is used to open and close the solenoid valve 76 at the time point obtained by the time point obtaining means to inject compressed air.

In addition, although the air injection mechanism 1 of this embodiment is applied to the component feeder 2, it is not limited to this, and may be applied to an appearance inspection machine, a measurement sorter, a tape reel, and the like.

Other configurations can be modified as long as they do not deviate from the gist of the present invention.

1‧‧‧Air injection mechanism

2‧‧‧Part feeder

3‧‧‧Two-port valve (switching valve, piezoelectric valve)

3A‧‧‧Flow adjustment method

3a‧‧‧The first port

3b‧‧‧ 2nd port

4‧‧‧ Host controller (parameter output means)

5‧‧‧ Piezo valve driver (proportional control means, parameter output means)

6‧‧‧Image processing device (time acquisition means, parameter output means)

10‧‧‧Air circuit

11‧‧‧Compressed air source

12‧‧‧ Regulator

13a‧‧‧The first air piping

13b‧‧‧The second air piping

13c‧‧‧The third air piping

20‧‧‧Transport

20a‧‧‧Side wall

21‧‧‧Air supply and exhaust

30‧‧‧Operation Department

32‧‧‧Power input

33‧‧‧ Switching Department

51‧‧‧Communication input and output

52‧‧‧Setting input section (input section)

53‧‧‧Applied voltage setting section

54‧‧‧Command input section

55‧‧‧Output Control Department

56‧‧‧Voltage output circuit

61‧‧‧Image Processing Department

62‧‧‧Image Discrimination Department

63‧‧‧Command Department

64‧‧‧Drive setting section

65‧‧‧Camera

L‧‧‧Occlusion position (non-connected position)

P‧‧‧Processing position

W‧‧‧Workpiece (shot object)

W’‧‧‧bad workpiece

Claims (7)

An air injection mechanism that sequentially injects compressed air toward a plurality of objects to be injected is characterized by: a flow rate adjustment means, which is connected to a compressed air source, and has a switching valve that can continuously change the opening and closing amount; parameter output means, The output has a parameter suitable for the type of the object to be injected; and the proportional control means is to proportionally control the opening and closing amount of the switching valve based on the applied voltage or current corresponding to the aforementioned parameter. The air injection mechanism according to claim 1, wherein the switching valve is a piezoelectric valve. The air injection mechanism according to claim 1 or 2, wherein the proportional control means includes a communication means, and when the parameter output means inputs the parameter through the communication means, the applied voltage or the applied current is switched according to the parameter Settings. The air injection mechanism according to claim 1 or 2, which is suitable for a part feeder that injects compressed air at a predetermined processing position on defective workpieces among the workpieces transported along the conveying path, A time point acquisition means at the time when a defective workpiece reaches the processing position, and the parameter output means is configured to output parameters suitable for the type of workpiece being transported, and the proportional control means is configured to be acquired at the time point At the obtained time, a voltage corresponding to the aforementioned parameter is applied to the switching valve. The air injection mechanism according to claim 1 or 2, which is suitable for a part feeder that injects compressed air at a predetermined processing position on defective workpieces among the workpieces transported along the conveying path, A time point acquisition means at the time point when the defective workpiece reaches the processing position, and the parameter output means is configured to have an input section that can input data about the type of workpiece being transported, and based on the data input by the input section The parameter is generated and output, and the proportional control means is configured to apply a voltage corresponding to the parameter to the switching valve at a time point obtained by the time point obtaining means. The air injection mechanism according to claim 4, wherein the switching valve includes at least a first port that communicates with a compressed air source, and a second port that communicates with an air supply and exhaust path formed in the transport path , And can be switched between a communication position that makes the first port and the second port a communication state, and a non-communication position that makes the first port and the second port a non-communication state The above switching valve. A parts feeder characterized by being configured to use the air injection mechanism described in any one of claims 1 to 6 to inject compressed air on a defective workpiece conveyed along a conveying path, and remove the defective workpiece from the foregoing The transport path is excluded or reversed on the transport path to change the posture.

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