JP3007248U - Foreign product detection coil for transport sorter - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to efficiently adjust the output value of the detection coil by adjusting the excitation balance without performing extremely inefficient adjustment such as rewinding the excitation coil. Dissimilarity detection coil device for transport sorter, adjusting method, and transport sorter. [Structure] As shown in FIG. 3B, the exciting coil 5 of the foreign matter detection coil device 2 originally in the state of FIG. 3A is partially (length L) of the exciting wire 14a of the empty winding part 14 as shown in FIG. 3B. ) Along the partial excitation coil 8 on the right side of the figure. As a result, the number of turns of the partial excitation coil 8 on the right side of the drawing slightly increases and the number of turns of the partial excitation coil 6 on the left side of the drawing decreases slightly. This is equivalent to the entire exciting coil 5 moving slightly to the right in the figure. Therefore, the excitation balance can be adjusted without rewinding the excitation coil 5, and the positional relationship between the excitation coil 5 and the detection coil 10 can be easily adjusted so that the output falls within the allowable range regardless of the posture of the workpiece. can do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a foreign matter detection coil device used in a transport sorter that detects the state of an eddy current generated in a measured object and sorts the measured object into non-defective and different products.

[0002]

[Prior art]

 In the quality inspection of metal products, conventionally, there is known an apparatus that generates an eddy current in a product, detects a defect from the generation state of the eddy current, and sorts out a non-defective product from a non-defective product. For example, as shown in FIGS. 6 and 7, the conveyor belt 104 is inserted into the foreign matter detection coil 102 in which the excitation coil 100 and the detection coil 101 are formed on the outer circumference of the cylindrical bobbin 99, and the conveyor belt 104 is placed on the conveyor belt 104. A product, for example, a bolt 106 is placed on the product and passed therethrough, and a difference between the output values of the detection coils 101 distinguishes a good product 106a from a different product (defective product) 106b. A device is known in which the device is excluded in 08 and is sent only in the case of a non-defective product 106a.

The exciting coil 100 generates an eddy current in the bolt 106 by causing an alternating magnetic field to flow and generating an alternating magnetic field. The detection coil 101 detects the influence of the generation state of the eddy current on the magnetic field line density by converting it into an electric signal.

When passing the bolt 106, an output peculiar to the product is obtained from the detection coil 101. However, when a different product 106b passes, the pattern and the peak are shifted as compared with the non-defective product 106a. If the deviation is within the allowable amount, it is determined as a non-defective product 106a, and if it exceeds the allowable amount, it is determined as a different product 106b. Therefore, it is possible to select products without destroying them.

By the way, the product is not always conveyed in the abnormal product detection coil 102 in a constant posture, and even if the product is a good product 106a, the output of the detection coil 101 may change depending on the posture. . For example, when the quality inspection of the bolt 106 is performed, whether the head 107a of the bolt 106 first enters the foreign matter detection coil 102 or the screw portion 107b of the bolt 106 first enters the foreign matter detection coil. Depending on the direction of the work, the output of the good product 106a is different.

Further, as shown in FIG. 7, depending on the positions of the tension pulley 110, the bypass gate 108, etc. arranged around the foreign matter detection coil 102, the generated magnetic path is affected and the surroundings of the foreign matter detection coil 102 are affected. There is a case where the magnetic path of is unbalanced and the difference in the output depending on the posture described above changes.

Conventionally, when the output varies depending on the posture of the product as described above, the arrangement of the exciting coil 100 with respect to the detection coil 101 is adjusted so that the posture of the non-defective product 106a is any posture, for example, the head of the bolt 106 described above. The excitation balance was adjusted so that it was within the allowable range regardless of whether the head portion 107a or the screw portion 107b was at the head.

[0008]

[Problems to be solved by the device]

 However, the excitation balance adjustment is performed by unwinding the winding of the exciting coil 100 of the wound foreign matter detection coil 102, shifting the position in either axial direction of the bobbin 99, and winding again. Then, it is measured whether or not the head portion 107a or the screw portion 107b of the bolt 106 is at the head and is within the allowable range, and if it is also outside the allowable range, the exciting coil 100 is again detected. Will be rewound.

Since the position of the exciting coil 100 sensitively appears in the output of the detecting coil 101, even if the exciting coil 100 is rewound, the output due to the difference in posture does not easily fall within the allowable range and is repeatedly The extremely troublesome work of rewinding is repeated. Therefore, the adjustment was very inefficient.

The present invention is a different product for a conveyor sorter that enables the output value of the detection coil to be adjusted efficiently without performing the extremely inefficient adjustment of repeating the rewinding of the exciting coil. A detection coil device is provided.

[0011]

[Means for Solving the Problems]

 The invention according to claim 1 is used in a conveyor sorter for detecting a state of an eddy current generated in an object to be measured and sorting the object to be measured, and an exciting coil for generating an eddy current in the object to be measured, and What is claimed is: 1. A heterogeneous detection coil having a detection coil for detecting the state of an eddy current, comprising: two wire winding parts around which a conducting wire for excitation is wound; and the two wire winding parts provided between the two wire winding parts. Detection of foreign matter for a conveyor sorting machine, characterized in that the exciting coil is composed of an empty winding part in which the exciting conductor wire is not wound except for the presence of a conducting wire connecting the exciting conductor wire of the wire winding part. It is a coil.

According to a second aspect of the present invention, the detection coil is provided in a circumferential groove formed in a substantially central portion of an outer circumference of a cylindrical body over the entire circumference, and the detection lead wire has a thickness substantially equal to the depth of the circumferential groove. And the exciting coil is formed on the outer circumference of the cylindrical body on which the detection coil is formed, with the hollow portion substantially overlapping the circumferential groove. The foreign matter detection coil for a conveyor sorter according to claim 1.

According to a third aspect of the present invention, the detection coil is formed by winding a detection conducting wire around the center of the outer circumference of the cylindrical body, and is tape-shaped on both sides of the winding portion of the detection conducting wire. The body is wound to form a raised portion having substantially the same height as the detection coil, and the exciting coil is provided on the outer periphery of the cylindrical body on which the detection coil and the raised portion are formed. The foreign matter detection coil for a conveyor / sorter according to claim 1, wherein is formed in a state of being substantially overlapped with the detection coil.

According to a fourth aspect of the present invention, the exciting wire is wound around the cylindrical body with a gap having a predetermined width formed substantially in the center, so that the exciting coil is provided in the gap having the predetermined width. The foreign matter detection coil for a transport sorter according to claim 2 or 3, wherein an empty winding portion is formed, and two wire winding portions are formed on both sides thereof.

[0015]

[Action and effect of the device]

 The invention according to claim 1 is an exciting wire except that the exciting coil has two wire winding parts around which an exciting wire is wound and a wire connecting the exciting wires of the two wire winding parts to each other. It is composed of an empty winding part which is not wound.

For this reason, a gap is formed between the exciting conductor wires that are in contact with the idle winding portion of either one of the two wire winding portions, or the corresponding lead wire or the lead wire in the idle winding portion is connected to the other wire winding portion. To align with the exciting wire that is in contact with the empty part of the wire winding part, simply move the exciting wire from the wire winding part to the empty part, or from the empty part to the wire winding part. You can easily do it by yourself.

When such adjustment is performed, the number of turns of one wire winding portion is decreased or the number of turns of the other wire winding portion is increased. Both of these changes will occur. This causes the same exciting effect as that of the entire exciting coil shifted to the other side when viewed from the whole. In this way, as described above, only by moving the exciting wire between the two wire winding portions and the empty winding portion, the same effect as shifting the position of the exciting coil with respect to the detection coil can be obtained. .

Therefore, the excitation balance can be adjusted without rewinding the excitation coil, and the output between the excitation coil and the detection coil can be easily set within the allowable range regardless of the posture of the non-measurement object. It can be adjusted easily and efficiently. It is also said that the detection coil is formed by winding a detection lead wire in a circumferential groove formed around the entire outer circumference of the cylindrical body over the entire circumference and having a thickness substantially equal to the depth of the circumferential groove. In addition, the exciting coil may be formed on the outer circumference of the cylindrical body on which the detection coil is formed, with the above-mentioned empty winding portion being substantially overlapped with the circumferential groove.

The detection coil is formed by winding a detection lead wire around the center of the outer circumference of the tubular body, and winding a tape-shaped body around both sides of the wound portion of the detection lead wire. A raised portion having substantially the same height as that of the detection coil is formed, and the exciting coil is provided around the outer circumference of the tubular body on which the detection coil and the raised portion are formed, and the empty winding portion is provided as the detection coil. It may be formed in a stacked state.

According to this structure, the circumferential groove is almost filled with the detection coil, or both sides of the detection coil are filled with the raised portion. The work of winding the cylindrical body with the exciting wire is not disturbed by the edge of the circumferential groove and the detection coil. Further, as described above, in order to adjust the output of the detection coil, the excitation wire is moved from the wire winding part to the wire winding part or from the wire winding part to the wire winding part to change the excitation balance. The adjustment work is extremely easy and efficient because it does not get in the way. Further, in the above-mentioned configuration, since the detection coil and the empty winding portion are substantially overlapped with each other, the direct influence of the excitation coil on the detection coil is reduced, and noise for detecting the eddy current of the non-measurement object is reduced. It is possible to reduce the impact on the environment.

Further, the transport / sorting machine provided with the above-mentioned foreign matter detection coil device can be efficiently manufactured, and the produced transport / sorting machine can accurately detect the foreign matter of the non-measurement object as usual. It is possible. In addition, even when the environment of the foreign matter detection coil device changes and readjustment is required, it is only necessary to shift the exciting wire for adjustment, so maintenance is very efficient. Becomes

In the wire winding portion, the exciting conductor wire may be densely wound without a gap, or when the work is a long work, the exciting conductor wire may be wound at intervals. However, after adjustment, it is usually fixed with tape etc. so that it will not be easily displaced especially if a gap is left.

[0023]

【Example】

 Next, an embodiment of the present invention will be described. [Embodiment 1] FIG. 1 shows an overall perspective view of a foreign matter detection coil device 2 as one embodiment, and FIG. The foreign matter detection coil device 2 includes a cylindrical bobbin 4 made of plastic, an exciting coil 5 formed on the outer periphery of the bobbin 4, and a detection coil 10 also formed on the outer periphery of the bobbin 4.

A circumferential groove 12 is formed on the bobbin 4 at the center of the outer circumference of the bobbin 4. The detection coil 10 is formed by winding the detection lead wire 10a in the circumferential groove 12 with a thickness substantially equal to the depth of the circumferential groove 12 and fixing the detection lead wire 10a by covering the entire surface with an adhesive tape. Partial excitation coils 6 and 8 are formed on the bobbins 4 on both sides of the circumferential groove 12 by winding excitation wires 6a and 8a, respectively. The exciting conductive wires 6a and 8a of the partial exciting coils 6 and 8 are formed by winding a single enamel-coated conductive wire around a bobbin 4 which is a cylindrical body with a gap corresponding to the width of the circumferential groove 12 in the center. By the turning, the empty winding portion 14 of the exciting coil 5 is formed in the circumferential groove 12, and two wire winding portions of the exciting coil 5, that is, the partial exciting coils 6 and 8 are formed on both sides thereof. Therefore, one exciting conductor wire 14a passes through the empty winding portion 14 and connects the partial exciting coils 6 and 8 on both sides. As described above, the exciting wires 6a, 8a, 14a are one continuous wire, and the exciting coil 5 is composed of the partial exciting coils 6 and 8 and the empty winding portion 14. The partial exciting coils 6 and 8 are formed by winding the exciting conductive wires 6a, 8a and 14a after the detection coil 10 is formed in the circumferential groove 12 of the bobbin 4, and at that time, the circumferential groove 12 is formed. Since it has already been almost completely filled with the detection coil 10, the work of winding the bobbin 4 around the exciting conductors 6a, 8a, 14a next interferes with the edges of the detection coil 10 and the circumferential groove 12. Never be done. Further, as will be described later, in order to adjust the output of the detection coil 10, the exciting wires 6a and 8a are shifted from the partial exciting coils 6 and 8 which are wire winding parts to the empty winding part 14 or from the empty winding part 14 to the partial winding. The adjustment work is extremely easy and efficient because it does not hinder the adjustment of the excitation balance by moving it to the excitation coils 6 and 8 to move it.

Further, on the outer circumference of the bobbin 4, grooves 16 and 18 are formed along the axial direction of the bobbin 4. The grooves 16 and 18 connect the respective end surfaces 4a and 4b of the bobbin 4 and the circumferential groove 12, and inside the grooves 16 and 18, the detection coil 10 arranged in the circumferential groove 12 is connected. The lead wires 20 and 22 are inserted and connected to a detection / control circuit described later. Further, the respective end portions 6b, 8b of the exciting wires 6a, 8a of the partial exciting coils 6, 8 are fixed to the bobbin 4 with an adhesive tape or the like, and the extended portions thereof serve as lead wires 24, 26 which will be described later. It is connected to the.

The foreign matter detection coil device 2 configured as described above is incorporated in the transport / sorter 30 shown in FIG. A conveyor belt 30a is inserted into the foreign matter detection coil device 2 as shown in FIG. 6, and a bolt 31 is placed on the conveyor belt 30a and passed therethrough. The lead wires 20, 22, 24, 26 of the foreign matter detection coil device 2 are connected to a control box (not shown), and an alternating current is passed through the partial excitation coils 6, 8 to generate an alternating magnetic field in the bobbin 4. An eddy current is generated in the bolt 31. Further, the state of this eddy current is detected by the detection coil 10 and the good product 31a and the different product (defective product) 31b are distinguished based on the output value. In the case of the different product 31b, the bypass gate 30b on the way drives the actuator 30c to incline the conveyor belt 30a and remove it to the different product chute 30d. In the case of non-defective product 31a, it is sent to the end by conveyor belt 30a and discharged to non-defective product chute 30e. As a result, the good product 31a and the different product 31b are automatically selected.

The configuration of the control box is represented by, for example, the detection / control circuit shown in FIG. First, the lead wires 24 and 26 of the partial excitation coils 6 and 8 are connected to the excitation power source 32, and an alternating current having a predetermined frequency is supplied. As a result, an alternating magnetic field is formed in the bobbin 4. One of the lead wires 20 and 22 of the detection coil 10 that is induced by this alternating magnetic field to generate a voltage is connected to the detection circuit 34, and the other lead wire 22 is grounded. The detection circuit 34 captures a signal having a frequency corresponding to the alternating magnetic field, converts the amplitude into a voltage signal, synthesizes it with the reference output of the work reference signal output circuit 38 via the work zero balance adjusting unit 36, and compares it. It is output to 40. The detection circuit 34 also adjusts the balance of the coil zero (phase) balance adjusting unit 41. The judgment circuit 44 compares the comparison result of the comparison circuit 40 with the reference signal corresponding to the allowable range given from the pass / fail reference signal output circuit 42. If it is within the allowable range, the judging circuit 44 does not output, and if it is outside the allowable range, it outputs the output. The actuator 30c is driven to open the bypass gate 30b, and the foreign matter 31b is discharged.

However, in the adjustment when assembling the foreign matter detection coil device 2 to the transport sorter 30, even if the work (here, the bolt 31) is a non-defective product 31a, if it is out of the allowable range depending on its direction. The excitation balance of the foreign matter detection coil device 2 is adjusted as follows.

That is, assuming that the exciting coil 5 of the foreign matter detection coil device 2 is in the state of FIG. 3A which is schematically shown at the beginning of assembling, as shown in FIG. 3B. A part (length L) of the exciting wire 14a of the empty winding portion 14 is run along the partial exciting coil 8 on the right side of the drawing. Therefore, a part of the exciting wire 6a is displaced from the partial exciting coil 6 on the left side of the drawing by the length L and moved to form the exciting wire 14a of the empty winding portion 14. By doing so, the number of turns of the partial excitation coil 8 on the right side of the drawing is slightly increased, and the number of turns of the partial excitation coil 6 on the left side of the drawing is slightly decreased. This is equivalent to the fact that the entire exciting coil 5 is slightly moved to the right side of the figure when viewed from the whole.

Therefore, as described above, only the exciting conductors 6 a, 8 a, 14 a are moved between the partially exciting coils 6 and 8 which are wire winding parts and the empty winding part 14, and the detection coil 10 is moved. The same effect as shifting the position of the exciting coil 5 is produced. Therefore, without rewinding the exciting coil 5, the output of the positional relationship between the exciting coil 5 and the detecting coil 10 easily falls within an allowable range regardless of the posture of the work (here, the direction of the bolt 31). Can be adjusted.

Of course, as shown in FIG. 3C, for example, three turns are moved from the partial excitation coil 6 on the left side of the figure to the right side of the figure, and the same number of turns is applied to the partial excitation coil 8 on the right side of the figure. Larger adjustments can be made by allowing them to go along. As described above, the movement of the exciting wires 6a, 8a, 14a may be performed only by shifting a part of them, or the number of turns itself may be largely changed, and the movements opposite to those of FIGS. The movement may be shifted in any direction, and any movement mode can be selected as needed, and further, this adjustment can be made extremely easy and efficient.

After the adjustment, the exciting conductors 6a, 8a, 14a are fixed by covering the entire surface or a portion thereof with an adhesive tape or the like. As an adjustment method other than this, either one of the partial excitation coils 6 and 8 is moved to the idle winding portion 14 side, or the exciting conducting wires 6a and 8a contacting the idle winding portion 14 are moved from the idle winding portion 14 side. It is also possible to make a finer adjustment by bringing the exciting lead wire 14a of No. 1 to the exciting lead wires 6a, 8a in contact with the empty winding portion 14 of the other partial exciting coil 6, 8.

Such adjustment can be easily performed by an operator with a hand or a jig. Moreover, while checking the output of the detection coil 10, it is possible to make a sufficient adjustment only by shifting the exciting wire 14a of the empty winding portion 14 and the exciting wires 6a and 8a in contact with the empty winding portion 14, Very efficient. Moreover, since such a simple work is required, automatic adjustment by a machine is also possible.

Further, since the detection coil 10 overlaps the empty winding portion 14 between the partial excitation coils 6 and 8, the direct influence of the partial excitation coils 6 and 8 is reduced, and the eddy current of the work is detected. It is possible to reduce the influence of noise on. Further, since the circumferential groove 12 is already almost filled with the detection coil 10, the exciting conductors 6a and 8a are partially wound by the exciting coil 6a, which is a wire winding portion, in order to adjust the output of the detecting coil 10. When adjusting the excitation balance by moving from 8 to the empty winding section 14 or moving from the empty winding section 14 to the partial excitation coils 6 and 8, the detection coil 10 and the circumferential groove 12 do not become an obstacle. The adjustment work is extremely easy and efficient.

[Others] In the first embodiment, the detection coil 10 overlapped with the empty winding portion 14 between the partial excitation coils 6 and 8. However, even if this is not done, it is similar to the partial excitation coils 6 and 8. It may be formed in any shape, or may be arranged at a position overlapping a part of the partial excitation coils 6 and 8.

Further, the detection coil 10 may extend over the entire bobbin 4. In this case, the circumferential groove 12 and the grooves 16 and 18 may not be provided. That is, the detection lead wire 10a is wound around the entire outer circumference of the bobbin 4 and fixed with an adhesive tape to form the detection coil 10, and the excitation lead wires 6a and 8a are wound on the detection coil 10 in the same manner as in the first embodiment. It suffices if the exciting coils 6 and 8 are formed, and the same effect as that of the first embodiment is produced with respect to the adjustment of the partial exciting coils 6 and 8.

In the first embodiment, the detection coil 10 was housed in the circumferential groove 12. However, after winding the detection coil 10 on the bobbin 4 having no circumferential groove 12, the bobbin 4 jumps out to the circumferential surface of the bobbin 4. The partial exciting coils 6 and 8 may be formed by winding a tape or the like on both sides of the detecting coil 10 so as to have the same height as that of the detecting coil 10 and winding the exciting wires 6a and 8a. Of course, the tape may be wound before the detection coil 10.

Even when the detection coil 10 is protruding to the peripheral surface of the bobbin 4, if the detection coil 10 is included and the empty winding portion 14 having a width wider than that of the detection coil 10 is formed, Between the partial excitation coils 6 and 8 and the protruding detection coil 10, there is a part of the empty winding portion 14 in which the excitation wires 6a and 8a can be easily displaced, and the desired effect can be obtained. Can be fulfilled

The partial excitation coils 6 and 8 which are the wire winding parts are wound by closely winding the excitation wires 6a and 8a without any gap, but when measuring a long work piece, the excitation wires 6a and A device having a gap between 8a is also adopted. In this case, after adjustment, the exciting wires 6a and 8a are fixed with tape or the like.

Further, in the first embodiment, only one exciting lead wire 14a is present in the empty winding portion 14 of the foreign matter detection coil device 2, but, of course, two or more exciting lead wires 14a can be present, but the number is small. In both cases, the winding density needs to be smaller than the winding density of the partial excitation coils 6 and 8 which are the wire winding portions. That is, from a different point of view, the structure of the exciting coil 5 of the first embodiment can be said to be one in which the partial exciting coils 6 and 8 having a large winding density are provided on both sides of the empty winding portion 14 having a small winding density. Therefore, by adjusting the density distribution, the excitation coil 5 as a whole is moved with respect to the detection coil 10, and the intended effect can be achieved.

Although the cylindrical bobbin 4 is used, the cylindrical bobbin 4 may have a triangular, square, pentagonal, hexagonal or more polygonal tubular shape.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an embodiment of a foreign matter detection coil device.

FIG. 2 is a sectional view taken along the line AA.

3A and 3B are explanatory diagrams of a winding state of an exciting wire of the foreign matter detection coil device, FIG. 3A is an explanatory diagram of a winding state at the beginning of manufacturing, and FIG. 3B is an explanatory diagram of a slightly adjusted state. , (C)
[FIG. 3] is an explanatory diagram of a state in which it is adjusted to a large extent.

FIG. 4 is a block diagram of a detection / control circuit of a conveyor sorter to which the foreign matter detection coil device is applied.

FIG. 5 is an overall perspective view of a transport sorter to which the foreign matter detection coil device is applied.

FIG. 6 is a schematic explanatory view of a conventional conveyor sorter.

FIG. 7 is an explanatory diagram of an influence of a conventional foreign matter detection coil on a magnetic path.

[Explanation of symbols]

2 ... Foreign matter detection coil device 4 ... Bobbin 5 ... Excitation coil 6, 8 ... Partial excitation coil 6a, 8a, 14a ... Excitation lead wire 10 ... Detection coil 10a ... Detection lead wire 12 ... Circumferential groove 14 ... Empty winding portion 16, 18 ... Groove 30 ... Conveyor sorter 30a ... Conveyor belt 30b ... Bypass gate 30c ... Actuator 30d ... Chute for different product 30e ... Chute for non-defective product 31 ... Bolt (work) 31a ... Good product 31b ... Different product

Claims (4)

[Scope of utility model registration request] 1. An exciting coil for generating an eddy current in an object to be measured, which is used in a conveyor sorter for detecting the state of an eddy current generated in the object to be measured to sort the object to be measured, and an eddy current of the eddy current. A heterogeneous detection coil having a detection coil for detecting a state, comprising: two wire winding portions around which a conductive wire for excitation is wound; and excitation of the two wire winding portions provided between the two wire winding portions. A foreign matter detection coil for a conveyor sorter, characterized in that the exciting coil is composed of an empty winding portion in which the exciting conductor wire is not wound except that there is a conducting wire for connecting the conducting wire. 2. The detection coil is formed by winding a detection lead wire in a circumferential groove formed over the entire circumference at substantially the center of the outer circumference of a tubular body and having a thickness substantially equal to the depth of the circumferential groove. The transport / sorting machine according to claim 1, wherein the exciting coil is formed on the outer periphery of the tubular body on which the detection coil is formed, with the empty winding portion substantially overlapping the circumferential groove. Foreign matter detection coil. 3. The detection coil is formed by winding a detecting wire around the outer periphery of a cylindrical body, and winding a tape-shaped body on both sides of the winding portion of the detecting wire. A raised portion having substantially the same height as that of the detection coil is formed, and the exciting coil is formed by superposing the empty winding portion on the outer circumference of the cylindrical body on which the detection coil and the raised portion are formed and approximately the detection coil. It is formed in a closed state.
Abnormality detection coil for the conveyor sorter described. 4. An empty winding portion of the exciting coil is formed in the gap portion having a predetermined width by winding an exciting wire around the cylindrical body with a gap having a predetermined width formed substantially in the center. The foreign matter detection coil for a transport sorter according to claim 2 or 3, wherein two wire winding portions are formed on both sides thereof.