阅读说明：本技术 检测装置及夹紧装置 (Detection device and clamping device ) 是由 田中雅人 喜入信博 于 2020-02-26 设计创作，主要内容包括：能用单一的非接触式开关区分并检测多个检测体的状态的检测装置及夹紧装置。具备：非接触式开关(1)；以及检测体(2),其具有导电性,能够相对于非接触式开关所具有的检测面沿径向移动,非接触式开关具有：检测用线圈(101),其在框体内与检测面相对配置；振荡电路(104),其进行振荡而使检测用线圈产生高频磁场；检波电路(105),其对振荡电路的振荡的振幅进行检波；比较电路(106),其将由检波电路检波得到的振幅分别与多个阈值进行比较；输出电路(107),其根据比较电路的与多个阈值的比较结果,分别输出表示由检波电路检波得到的振幅是否在由该多个阈值构成的多个输出范围内的信号；以及设定输入部(109),其设定针对比较电路的多个阈值。(A detection device and a clamp device capable of detecting the states of a plurality of detection bodies by a single non-contact switch. The disclosed device is provided with: a contactless switch (1); and a detection body (2) which has conductivity and can move along a radial direction relative to a detection surface of the non-contact switch, wherein the non-contact switch comprises: a detection coil (101) disposed in the housing so as to face the detection surface; an oscillation circuit (104) which oscillates and causes the detection coil to generate a high-frequency magnetic field; a detection circuit (105) that detects the amplitude of the oscillation circuit; a comparison circuit (106) that compares the amplitudes detected by the detection circuit with a plurality of thresholds, respectively; an output circuit (107) which outputs a signal indicating whether or not the amplitude detected by the detector circuit is within a plurality of output ranges formed by the plurality of threshold values, respectively, based on the comparison result with the plurality of threshold values by the comparator circuit; and a setting input unit (109) that sets a plurality of thresholds for the comparison circuit.)

1. A detection device is characterized by comprising:

a non-contact switch; and

a detection body having conductivity and capable of moving in a radial direction with respect to a detection surface of the non-contact switch,

the non-contact switch has:

a detection coil disposed in the housing so as to face the detection surface;

an oscillation circuit that oscillates the detection coil to generate a high-frequency magnetic field;

a detector circuit that detects an amplitude of oscillation of the oscillator circuit;

a comparator circuit that compares the amplitudes detected by the detector circuit with a plurality of thresholds, respectively;

an output circuit that outputs a signal indicating whether or not the amplitude detected by the detector circuit is within a plurality of output ranges formed by the plurality of threshold values, respectively, based on the comparison result with the plurality of threshold values by the comparator circuit; and

and a setting input unit that sets a plurality of thresholds for the comparison circuit.

2. The detection apparatus according to claim 1,

the comparison circuit compares the amplitude detected by the detector circuit with a first threshold value, a second threshold value that is a value different from the first threshold value, a third threshold value that is a value between the first threshold value and the second threshold value, and an upper limit value,

the output circuit outputs a signal indicating whether or not the amplitude detected by the detector circuit is within a first output range including the first threshold and the second threshold, and a signal indicating whether or not the amplitude detected by the detector circuit is within a second output range including the third threshold and an upper limit, respectively, based on the comparison result with the plurality of thresholds by the comparison circuit.

3. The detection apparatus according to claim 1 or 2,

the detection body is configured in a rod shape having a small surface facing the detection surface.

4. A clamping device is characterized by comprising:

a clamp that moves in an axial direction to attach and detach a workpiece;

a moving shaft coupled to the clamp; and

the detection device according to any one of claims 1 to 3,

the detection body is attached to the movement axis in a direction perpendicular to the movement axis.

Technical Field

The present invention relates to a detection device and a clamp device provided with a non-contact switch.

Background

Conventionally, a non-contact switch (non-contact sensor) that determines the presence or proximity of a detection body having conductivity such as a metal is known (for example, see patent document 1). The non-contact switch determines the presence or proximity of a detection object by detecting, by a detection unit, a change in impedance, Q value, or the like of a detection coil that accompanies the presence or proximity of the detection object. The Q value is a value representing an inductance loss caused by an electromagnetic induction action, and a higher Q value represents a smaller loss.

Further, the non-contact switch detects a distance between the detection body and a reference point in the non-contact switch according to the purpose of use. The reference point is, for example, a point on the surface of the stainless steel cover at the distal end of the detection section, which faces the detection body.

Further, a non-contact switch is known which improves the performance of determination of a detection body made of a specific metal by using a threshold value corresponding to the type of metal (for example, see patent document 2). In addition, in the non-contact switch, the threshold value used is 1, and 1 metal of a plurality of metals can be detected in actual use.

Disclosure of Invention

Problems to be solved by the invention

In the conventional non-contact switch, since the number of threshold values used is 1, the states of a plurality of detection bodies cannot be discriminated and detected. Therefore, when the states of a plurality of detection bodies are to be discriminated and detected, a plurality of non-contact switches need to be used. For example, when it is desired to detect opening and closing of a clamp such as a collet chuck clamp or a turret clamp using a conventional non-contact switch, a plurality of non-contact switches are required.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a detection device capable of detecting states of a plurality of detection bodies by differentiating them with a single non-contact switch.

Means for solving the problems

The detection device of the present invention is characterized by comprising: a non-contact switch; and a detection body having conductivity and capable of moving in a radial direction with respect to a detection surface of the non-contact switch, the non-contact switch including: a detection coil disposed in the housing so as to face the detection surface; an oscillation circuit that oscillates and causes the detection coil to generate a high-frequency magnetic field; a detection circuit that detects the amplitude of oscillation of the oscillation circuit; a comparator circuit that compares the amplitudes detected by the detector circuit with a plurality of thresholds, respectively; an output circuit that outputs a signal indicating whether or not the amplitude detected by the detector circuit is within a plurality of output ranges formed by the plurality of threshold values, respectively, based on the comparison result with the plurality of threshold values by the comparator circuit; and a setting input unit that sets a plurality of thresholds for the comparison circuit.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, since the above configuration is adopted, the states of the plurality of detection bodies can be detected while being discriminated by the single non-contact switch.

Drawings

Fig. 1 is a diagram showing a configuration example of a detection device according to embodiment 1.

Fig. 2 is a diagram showing an example of the configuration of the contactless switch according to embodiment 1.

Fig. 3 is a diagram showing an example of the correspondence relationship between the outputs from the two output terminals of the output circuit and the position of the detection body in the detection device according to embodiment 1.

Fig. 4 (a) is a diagram showing a case where the detection body is located at the center position (0mm) of the detection surface of the non-contact switch in the detection device according to embodiment 1, and fig. 4 (B) is a diagram showing the detection value of the non-contact switch in the case of fig. 4 (a).

Fig. 5 (a) is a diagram showing a case where the detection body is located at a position 3.2mm away from the center position of the detection surface of the contactless switch in the detection device according to embodiment 1, and fig. 5 (B) is a diagram showing a detection value of the contactless switch in the case of fig. 5 (a).

Fig. 6 (a) is a diagram showing a case where the detection body is located at a position 6.4mm away from the center position of the detection surface of the contactless switch in the detection device according to embodiment 1, and fig. 6 (B) is a diagram showing the detection value of the contactless switch in the case of fig. 6 (a).

Fig. 7 (a) is a diagram showing a case where the detection body is located at a position 9.6mm away from the center position of the detection surface of the contactless switch in the detection device according to embodiment 1, and fig. 7 (B) is a diagram showing a detection value of the contactless switch in the case of fig. 7 (a).

Fig. 8 is a diagram for explaining threshold setting for the contactless switch in embodiment 1.

Fig. 9 is a diagram showing an example of a configuration of a clamp apparatus to which the detection apparatus of embodiment 1 is applied.

Fig. 10A and 10B are diagrams showing an example of a relationship between a position of a detection body and opening and closing of a clamp when the detection device according to embodiment 1 is applied to a clamp device, fig. 10A is a diagram showing a state in which the clamp is open, and fig. 10B is a diagram showing a state in which the clamp is closed.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.