JP6567321B2 - Clamp sensor - Google Patents

Description

  The present invention relates to a clamp type sensor that detects a current flowing through a detection target and a voltage of the detection target.

  As this type of clamp-type sensor, the applicant discloses a clamp-type sensor including a clamp portion and a sensor main body portion and configured to detect a current flowing through a measurement target wire and a voltage of the measurement target wire in the following patent document. doing. In this case, the clamp unit detects a voltage of the measurement target electric wire, a magnetic core that forms an annular magnetic path for detecting a current flowing through the measurement target electric wire, a detection coil wound around the magnetic core, and It has a detection electrode and is configured to be able to clamp the measurement target electric wire.

  Specifically, the clamp portion includes a magnetic core, a detection coil, and a detection electrode, and a fixed sensor arm having one end fixed to the sensor main body, a magnetic core, and the detection coil. The movable sensor arm is pivotally attached to the sensor main body, and is disposed between the fixed sensor arm and the movable sensor arm so that one end thereof is rotatable to the sensor main body together with the one end of the movable sensor arm. A pressing arm that clamps the measurement target wire in combination with the fixed sensor arm and presses the measurement target wire in the vicinity of the detection electrode is provided. In this case, a first operation lever extending in the opposite direction to the movable sensor arm is disposed at one end of the movable sensor arm, and the one end of the pressing arm extends in the opposite direction to the pressing arm. A second operating lever is provided.

  The second operating lever is disposed in a state of covering the first operating lever, and the first operating lever is biased in a direction protruding from the opening of the sensor main body by a spring disposed in the sensor main body. Has been. Accordingly, in the clamp type sensor disclosed by the applicant, the movable sensor arm is always urged so as to rotate toward the fixed sensor arm by the urging force of the spring urging the first operation lever. Yes. Further, the second operation lever is urged in a direction away from the first operation lever by a spring disposed between the second operation lever and the first operation lever. As a result, in the clamp type sensor disclosed by the applicant, the pressing arm is rotated toward the fixed sensor arm by the biasing force of the spring biasing the second operating lever with respect to the first operating lever. Is always energized.

  When measuring the current flowing through the measurement target wire and the voltage of the measurement target wire using the clamp sensor, first, the measurement target wire is clamped by the clamp unit. Specifically, as an example, the movable sensor arm is rotated with respect to the sensor main body by grasping the sensor main body with a finger placed on the second operation lever, and the distal end (the other end of the movable sensor arm). ) And the distal end portion (the other end portion) of the fixed sensor arm are separated from each other (the clamp portion is opened). At this time, as a result of the second operating lever being rotated in the direction away from the first operating lever by the biasing force of the spring disposed between the two operating levers, the holding arm is moved with respect to the sensor body. It is rotated and the front-end | tip part is spaced apart from the internal peripheral surface of a fixed sensor arm. Thereby, it will be in the state which can clamp a measuring object electric wire.

  Next, the measurement target electric wire is introduced between the movable sensor arm and the pressing arm and the fixed sensor arm, and the finger hung on the second operation lever is released. As a result, the movable sensor arm is rotated toward the fixed sensor arm by the biasing force of the spring disposed between the sensor main body and the first operation lever, and the tip ends of the two sensor arms (the other end) Are in contact with each other, and the pressing arm is rotated toward the fixed sensor arm by the urging force of the spring disposed between the two operation levers, so that the detection sensor in the fixed sensor arm is near the detection electrode. The measurement target electric wire is pressed. Thereby, the clamping of the electric wire to be measured is completed. After this, the current flowing through the measurement target wire and the voltage of the measurement target wire are measured by operating the operation unit of the measurement device main body (main unit) to which the clamp type sensor is connected to execute the measurement process. Is done.

Japanese Unexamined Patent Publication No. 2009-41925 (page 4-13, FIG. 1-9)

  However, the above clamp type sensor has the following problems to be improved. That is, in the clamp type sensor described above, when the current flowing through the measurement target wire or the voltage of the measurement target wire is detected, the detection in the fixed sensor arm is performed by the holding arm disposed between the fixed sensor arm and the movable sensor arm. A configuration is adopted in which the measurement target electric wire is pressed in the vicinity of the electrode. In this case, the voltage detected by the detection electrode is likely to fluctuate due to the influence of another conductor other than the measurement target electric wire (the conductor present around the measurement target electric wire at the measurement location). It is preferable to clamp the measurement target wire as far as possible from the conductor of the wire, and for this purpose, the inside of the annular body composed of the fixed sensor arm and the movable sensor arm (the annular formed by the magnetic core and the detection coil) It is preferable to clamp the measurement target electric wire on the inner side of the magnetic path. However, in the clamp type sensor, as described above, the detection electrode is disposed in the fixed sensor arm, and the voltage is measured in a state where the measurement target electric wire is pressed by the pressing arm in the vicinity of the detection electrode in the fixed sensor arm. For this reason, there is a possibility that it is difficult to improve measurement accuracy due to the influence of other conductors other than the measurement target, and improvement of this point is desired.

  The present invention has been made in view of such a problem to be improved, and a main object of the present invention is to provide a clamp type sensor capable of improving detection accuracy.

In order to achieve the above object, a clamp type sensor according to claim 1 is a clamp type sensor comprising a first sensor unit for detecting a current flowing through a detection target and a second sensor unit for detecting a voltage of the detection target. The first sensor unit includes a pair of first clamp arms disposed on the main body, and at least one of the first clamp arms is pivotally supported on the main body by the first support shaft. It is configured to be rotatable with respect to the main body portion around the end portion, and each tip portion is engaged with each other in a state of being clamped so as to surround the detection target with each first clamp arm, thereby forming an annular body. the current detected in a state where the said clamp while said second sensor unit includes a pair of second clamp arms which are disposed in the main body portion, both of the respective second clamp arm and the second support shaft Thus it is respectively rotatably configured for the body portion around the axially supported by the base end portion to the body portion, and each said respective second clamp arm is inside of the annular body in the plan view state The detection target is sandwiched and clamped at positions separated from the first clamp arm, and the voltage is detected in the clamped state.

The clamp type sensor according to claim 2 is the clamp type sensor according to claim 1 , wherein each of the second clamp arms includes a top portion of the annular body on which the tip end side of the first clamp arm is positioned and the annular shape. A straight line passing through the center of the body is set as a symmetric line so as to rotate with respect to the main body along a rotational locus that is line symmetric in the planar view state.

According to a third aspect of the present invention, in the clamp type sensor according to the first or second aspect , both the first clamp arms are configured to be rotatable with respect to the main body .

The clamp type sensor according to claim 4 is the clamp type sensor according to any one of claims 1 to 3 , wherein the rotatable first clamp arm and the second clamp arm are the first clamp arm and the clamp type sensor. Both the first clamp arm and the second clamp arm are configured to rotate with respect to the main body portion in conjunction with a rotation operation on one of the second clamp arms.

According to the clamp type sensor according to claim 1, together constituting both pivotally each second clamp arm with respect to the main body portion around a base end pivotally supported to the main body portion by a second support shaft Each second clamp arm is configured so as to sandwich the detection target at a position inside the annular body in a state in plan view of the annular body constituted by the pair of first clamp arms and at a position separated from each first clamp arm. Therefore, even if other conductors other than the detection target exist around the clamp type sensor, compared with the conventional configuration in which the detection target is pressed against the fixed sensor arm functioning as the first clamp arm and the voltage is measured. The detection electrode for voltage detection arranged on the second clamp arm can be separated from the conductor existing around. For this reason, according to this clamp type sensor, the influence of conductors other than the detection target at the time of detecting a voltage can be suppressed to a small extent, and as a result, detection accuracy can be sufficiently improved.

Also, by the respective rotatable structure to both the main body portion of the second clamp arm, it is possible to increase spacing the respective distal ends of the second clamp arm when clamping the detection target Therefore, as a result of being able to easily clamp the detection target, it is possible to sufficiently improve the work efficiency of the clamp.

According to the clamp type sensor of the second aspect of the present invention, the rotation with respect to the main body part is performed with a rotational trajectory that is line-symmetrical in a plan view state with a straight line passing through the top of the annular body and the center of the annular body as a symmetry line. As a result of configuring each second clamp arm to do so, the detection target can be clamped by each second clamp arm on the straight line, that is, in the center part (left and right center part) of the annular body in a plan view state, The current detection accuracy can be sufficiently improved.

In addition, according to the clamp type sensor of the third aspect , since both the first clamp arms are configured to be rotatable with respect to the main body portion, when the detection target is clamped, Since each front-end | tip part can be separated largely, as a result of being able to clamp a detection target easily, the working efficiency of a clamp can fully be improved.

According to the clamp type sensor of the fourth aspect , both the first clamp arm and the second clamp arm are attached to the main body portion in conjunction with the turning operation with respect to either the first clamp arm or the second clamp arm. By configuring so as to rotate with respect to each other , operability can be sufficiently improved.

1 is a front view of a clamp type sensor 1. FIG. 1 is a perspective view of a clamp type sensor 1. FIG. It is a perspective view of the state which decomposed | disassembled the main-body part. It is a disassembled perspective view of the 1st clamp arm 11a and the 2nd clamp arm 21a. It is a disassembled perspective view of the 1st clamp arm 11b and the 2nd clamp arm 21b. FIG. 5 is a first explanatory view explaining the operation of the clamp type sensor 1. FIG. 6 is a second explanatory diagram for explaining the operation of the clamp sensor 1. FIG. 6 is a third explanatory diagram illustrating the operation of the clamp sensor 1. FIG. 6 is a fourth explanatory view for explaining the operation of the clamp sensor 1. FIG. 10 is a fifth explanatory diagram illustrating the operation of the clamp sensor 1.

  Hereinafter, embodiments of a clamp type sensor will be described with reference to the accompanying drawings.

  Initially, the structure of the clamp type sensor 1 shown in FIG. 1 as an example of a clamp type sensor is demonstrated. The clamp type sensor 1 is a clamp type sensor that detects a current flowing through a detection target (for example, the electric wire 200 shown in FIGS. 8 to 10) and a voltage of the detection target in a non-contact manner, and is shown in FIGS. Thus, the main body part 2, the first sensor part 3, the second sensor part 4, the support shafts 5a and 5b (see FIG. 3), the springs 6aa and 6ab (see FIGS. 4 and 5), and the springs 6ba and 6bb (FIG. 4). , 5).

  As shown in FIG. 3, the main body 2 is configured to include cases 2 a and 2 b that can be fitted, and in the fitted state of the cases 2 a and 2 b, the base end 3 a side of the first sensor unit 3, and the second The base end 4a side of the sensor unit 4 is accommodated. In addition, as shown in FIG. 2, the main body 2 projects the front end 3 b side of the first sensor unit 3 and the front end 4 b side of the second sensor unit 4 when the cases 2 a and 2 b are fitted. An opening Oa is formed. The body 2 is formed with openings Ob and Oc for projecting the levers C1 and C1 of the first sensor unit 3 and the levers C2 and C2 of the second sensor unit 4 when the cases 2a and 2b are fitted. ing.

  As shown in FIGS. 1 to 3, the first sensor unit 3 includes a pair of first clamp arms 11 a and 11 b (hereinafter, also referred to as “first clamp arm 11” when not distinguished) and detection coils 12 a and 12 b (see FIG. 1). 4 and 5), and clamps the detection target to detect the current flowing through the detection target.

  As shown in FIG. 4, the first clamp arm 11a includes a pair of halves H1aa and H1ab that can be fitted to each other, and is an internal space between a base end portion A1 and a tip end portion B1 formed in an arc shape in plan view. And the spring 6aa can be housed in the internal space of the base end portion A1. In this case, the spring 6aa is constituted by a torsion coil spring as an example, and the rotation direction (in FIG. 1) in which the tip B1 of the first clamp arm 11a is close to the tip B1 (see FIG. 1) of the first clamp arm 11b. The first clamp arm 11a is biased in the clockwise direction.

  As shown in FIGS. 3 and 4, the base end A1 of the first clamp arm 11a is provided with a lever C1 used for rotating the first clamp arm 11a. As shown in FIG. 4, the lever C1 is provided with a fitting portion D1 for fitting one end of the spring 6ba. In this case, the spring 6ba is constituted by a coil spring as an example, and the levers C1 and C2 are arranged so that the lever C1 of the first clamp arm 11a and the lever C2 (see FIGS. 3 and 4) of the second clamp arm 21a are separated from each other. Energize. Further, as shown in FIGS. 3 and 4, an insertion hole E1 for inserting the support shaft 5a (see FIG. 3) is formed in the base end portion A1 of the first clamp arm 11a.

  As shown in FIG. 5, the first clamp arm 11 b includes a pair of halves H1ba and H1bb that can be fitted to each other, and an internal space between a base end portion A1 and a tip end portion B1 that is formed in a planar arc shape. And the spring 6ab can be housed in the internal space of the base end portion A1. In this case, the spring 6ab is formed of a torsion coil spring similar to the spring 6aa, and the rotation direction in which the tip B1 of the first clamp arm 11b is close to the tip B1 (see FIG. 1) of the first clamp arm 11a (see FIG. 1). The first clamp arm 11b is biased in the counterclockwise rotation direction in FIG.

  As shown in FIGS. 3 and 5, a lever C1 is provided at the base end A1 of the first clamp arm 11b for use in rotating the first clamp arm 11b. As shown in FIG. 5, the lever C1 is provided with a fitting portion D1 for fitting one end of the spring 6bb. In this case, the spring 6bb is composed of a coil spring similar to the spring 6ba, and the lever C1 of the first clamp arm 11b and the lever C2 (see FIGS. 3 and 5) of the second clamp arm 21b are separated from each other. C1 and C2 are energized. Further, as shown in FIGS. 3 and 5, an insertion hole E1 through which the support shaft 5b (see FIG. 3) is inserted is formed in the base end portion A1 of the first clamp arm 11b.

  In this clamp type sensor 1, as shown in FIG. 6, the base end portion A <b> 1 of the first clamp arm 11 a is pivotally supported on the main body 2 by a support shaft 5 a serving as a first support shaft, and this base end portion A <b> 1 (axis The first clamp arm 11a is configured to rotate about the supported part). Further, the base end portion A1 of the first clamp arm 11b is pivotally supported on the main body 2 by a support shaft 5b serving as a first support shaft, and the first clamp arm is centered on the base end portion A1 (part supported by the shaft). 11b is configured to rotate. That is, in this clamp type sensor 1, both the 1st clamp arms 11a and 11b are comprised so that rotation is possible. In FIGS. 6 to 10, the case 2 b (see FIG. 3) of the main body 2 is removed.

  Moreover, in this clamp type sensor 1, when each front-end | tip part B1, B1 in each 1st clamp arm 11a, 11b engages, as shown to FIG. 9, 10, each 1st clamp arm 11a, 11b is set. In the state where the annular body R is configured and the detection target is surrounded by the annular body R (the detection target is clamped), the first sensor unit 3 detects the current flowing through the detection target.

  As shown in FIGS. 1 to 3, the second sensor unit 4 includes a pair of second clamp arms 21 a and 21 b (hereinafter also referred to as “second clamp arm 21” when not distinguished) and a detection electrode 22 (see FIG. 4). ), And the detection target voltage is detected by clamping the detection target.

  As shown in FIG. 4, the second clamp arm 21a includes a pair of halves H2aa and H2ab. Further, as shown in FIGS. 3 and 4, the half bodies H2aa and H2ab are configured to be fitted to each other with the proximal end portion A1 of the first clamp arm 11a and the lever C1 being sandwiched therebetween. Further, as shown in FIG. 4, the second clamp arm 21 a is configured to be able to accommodate the detection electrode 22 in an internal space between the base end portion A <b> 2 and the tip end portion B <b> 2 formed in a planar view arc shape. ing. As shown in FIGS. 3 and 4, a lever C <b> 2 used when the second clamp arm 21 a is rotated is provided at the base end portion A <b> 2 of the second clamp arm 21 a. As shown in FIG. 4, the lever C2 is provided with a fitting portion D2 for fitting the other end of the spring 6ba. Further, as shown in FIGS. 3 and 4, an insertion hole E <b> 2 for inserting the support shaft 5 a (see FIG. 3) is formed in the base end portion A <b> 2 of the second clamp arm 21 a.

  As shown in FIG. 5, the second clamp arm 21b includes a pair of half bodies H2ba and H2bb that can be fitted to each other. Further, as shown in FIGS. 3 and 5, the half bodies H2ba and H2bb are configured to be fitted to each other with the proximal end portion A1 of the first clamp arm 11b and the lever C1 sandwiched therebetween. Further, as shown in FIG. 5, the second clamp arm 21b is formed in an arc shape from the base end A2 to the tip end B2. As shown in FIGS. 3 and 5, a lever C2 is provided at the base end A2 of the second clamp arm 21b for use in rotating the second clamp arm 21b. Further, as shown in FIG. 5, the lever C2 is provided with a fitting portion D2 for fitting the other end of the spring 6bb. Further, as shown in FIGS. 3 and 5, an insertion hole E2 through which the support shaft 5b (see FIG. 3) is inserted is formed in the base end portion A2 of the second clamp arm 21b.

  In this clamp type sensor 1, as shown in FIG. 6, the base end portion A <b> 2 of the second clamp arm 21 a is pivotally supported on the main body portion 2 by a support shaft 5 a serving as a second support shaft, and this base end portion A <b> 2 (axis The second clamp arm 21a is configured to rotate about the supported part). Further, the base end portion A2 of the second clamp arm 21b is pivotally supported on the main body 2 by a support shaft 5b as a second support shaft, and the second clamp arm is centered on the base end portion A2 (the portion supported by the shaft). 21b is configured to rotate. That is, in this clamp type sensor 1, both the 2nd clamp arms 21a and 21b are comprised so that rotation is possible.

  In this clamp type sensor 1, as shown in FIGS. 6, 7, and 10, the top portion Ra and the annular body R of the annular body R on which the distal end portions B <b> 1 side of the first clamp arms 11 of the first sensor unit 3 are located. Each of the second clamp arms 21 is rotated along a rotation trajectory that is line symmetric in a plan view with respect to a straight line L passing through the central portion Rb. For this reason, in this clamp type sensor 1, as shown in FIG. 10, the detection target (the electric wire 200 shown in the figure) is clamped by each second clamp arm 21 on the straight line L.

  Moreover, in this clamp type sensor 1, as shown in FIG. 10, the 2nd sensor part 4 is the inner side in the planar view state of the cyclic | annular body R comprised by the 1st clamp arm 11 of the 1st sensor part 3, and The detection target (the electric wire 200 shown in the figure) is sandwiched and clamped by each inner peripheral portion F of each second clamp arm 21 at a position separated from each first clamp arm 11, and in this state, the detection target is detected. Detect voltage.

  Next, the usage method of the clamp type sensor 1 is demonstrated with reference to drawings.

  This clamp type sensor 1 is used when measuring the current flowing through the detection target and the voltage of the detection target and measuring the power supplied via the detection target from the measured value. For example, when measuring electric power using the electric wire 200 shown in FIG. 8 as a detection target, the clamp type sensor 1 is connected to a measurement device outside the drawing via a cable outside the drawing, and then the measurement device is operated.

  In this case, in the initial state (the state where the levers C1 and C2 are not operated), as shown in FIG. 6, each of the first sensor units 3 is caused by the urging force of the springs 6aa and 6ab (see FIGS. 4 and 5). The tip ends B1 of the one clamp arm 11 are in contact with each other, and the first clamp arm 11 forms an annular body R. Further, each lever C2 of each second clamp arm 21 of the second sensor unit 4 is applied in a direction away from the lever C1 of each first clamp arm 11 by the urging force of the springs 6ba and 6bb (see FIGS. 4 and 5). Therefore, as shown in FIG. 6, the tip ends B2 of the second clamp arms 21 are in contact with each other.

  Subsequently, as shown in FIG. 7, each lever C <b> 2 of each second clamp arm 21 is pushed into the center side of the main body 2 against the urging force of the springs 6 ba and 6 bb (rotating operation is performed). At this time, as shown in the figure, each second clamp arm 21 rotates around the base end portion A2 supported by the support shafts 5a and 5b, and the respective front end portions B2 are separated from each other.

  Next, by further pushing each lever C2, the outer peripheral wall Ca2 of each lever C2 comes into contact with the outer peripheral wall Ca1 of each lever C1 of each first clamp arm 11, as shown in FIG. It is pushed together with each lever C2. At this time, by further pushing the levers C1 and C2 against the urging forces of the springs 6ba and 6bb and the urging forces of the springs 6aa and 6ab, the second clamp arms 21 are further rotated and The one clamp arm 11 rotates around the base end portion A1 supported by the support shafts 5a and 5b, and the tip end portions B1 are separated from each other.

  Next, as shown in FIG. 8, the first clamps 11 are passed through the electric wires 200 through the gaps between the tip ends B1 of the first clamp arms 11 and the tips B2 of the second clamp arms 21. The electric wire 200 is positioned inside the arm 11 and each second clamp arm 21, and subsequently, the force (pushing force) applied to each lever C1 (lever C1, C2) is loosened. At this time, as shown in FIG. 9, due to the urging force of the springs 6aa and 6ab, the first clamp arms 11 rotate about the base end portions A1, and the tip end portions B1 come into contact with each other. An annular body R is constituted by the first clamp arm 11. Each second clamp arm 21 also rotates about each base end portion A2 in a direction in which the tip end portions B2 approach each other.

  Next, the force applied to each lever C1 is further loosened. At this time, due to the urging force of the springs 6ba and 6bb, as shown in FIG. 10, each second clamp arm 21 is further rotated in the direction in which the tip portions B2 come close to each other, and then each second clamp arm. The electric wire 200 is sandwiched and clamped by the inner peripheral portion F of 21.

  In this case, in this clamp type sensor 1, as shown in FIG. 10, each of the second clamp arms 21 is connected to the electric wire 200 at a position inside the annular body R in a plan view and away from each first clamp arm 11. It is comprised so that it may pinch and clamp. For this reason, in this clamp type sensor 1, even if other conductors other than the electric wire 200 exist around the clamp type sensor 1, the electric wire 200 is pressed against the fixed sensor arm that functions as the first clamp arm 11, and the voltage is Compared with the conventional configuration for measuring the above, the influence of the second clamp arm 21 (the detection electrode 22 disposed on the second clamp arm 21a) is less affected by the distance from the surrounding conductor. It is possible to suppress.

  Moreover, in this clamp type sensor 1, each 2nd clamp arm 21 rotates with the rotation locus | trajectory which becomes axisymmetric in planar view state by making the straight line L which passes the top part Ra and center part Rb of the annular body R into a symmetrical line. For this reason, in this clamp type sensor 1, as shown in FIG. 10, it detects by each 2nd clamp arm 21 in the center part (right-and-left center part in the figure) on the straight line L, ie, the planar view state. The object is clamped. In this case, it is clear from the experimental results of the inventors that in this clamp type sensor 1, the current detection accuracy is improved as the detection target is located at the center of the annular body R. For this reason, in this clamp type sensor 1 in which each second clamp arm 21 clamps the detection target in the central portion of the annular body R in a plan view state, it is possible to sufficiently improve the current detection accuracy.

  On the other hand, the 1st sensor part 3 detects the electric current which flows into the electric wire 200, and outputs a detection signal in the state which surrounded the electric wire 200 with the annular body R comprised by each 1st clamp arm 11, and was clamped. Moreover, the 2nd sensor part 4 detects the voltage of the electric wire 200, and outputs a detection signal in the state which pinched | interposed the electric wire 200 by each inner peripheral part F of each 2nd clamp arm 21, and clamped. Next, the measurement device inputs the current detection signal and the voltage detection signal output from the first sensor unit 3 and the second sensor unit 4 through the cable, respectively, and is supplied by the electric wire 200 based on each detection signal. Measure the power.

  Subsequently, when the measurement is finished and the clamping of the electric wire 200 by the clamp type sensor 1 is released, each lever C2 of each second clamp arm 21 is pushed in, and each second clamp arm 21 is rotated to turn each tip. The parts B2 are separated from each other, and the first clamp arms 11 are rotated to separate the tip parts B1 from each other. Next, the first clamp arms 11 and the second clamps are passed through the electric wires 200 through the gaps between the tip portions B2 of the second clamp arms 21 and the tips B1 of the first clamp arms 11. The electric wire 200 is positioned outside the arm 21. Subsequently, the force applied to each lever C1 is loosened, and the clamp type sensor 1 is returned to the initial state.

  Thus, according to this clamp type sensor 1, while configuring each 2nd clamp arm 21 so that rotation is possible centering on base end part A2 pivotally supported by main part 2 with support shafts 5a and 5b, it is plane. By configuring each second clamp arm 21 so as to sandwich the detection target at a position inside the annular body R in the viewing state and at a distance from each first clamp arm 11, other conductors other than the detection target are clamp-type sensors. Even if it is present around 1, it is arranged on the second clamp arm 21 as compared with the conventional configuration in which the detection target is pressed against the fixed sensor arm functioning as the first clamp arm 11 and the voltage is measured. The sensing electrode 22 can be separated from the surrounding conductor. For this reason, according to this clamp type sensor 1, since the influence of conductors other than the detection object at the time of detecting a voltage can be suppressed little, detection accuracy can fully be improved.

  Moreover, according to this clamp type sensor 1, since both the 2nd clamp arms 21 were comprised so that rotation was possible, when clamping a detection target, since front-end | tip part B2 can be largely separated, detection is carried out. As a result that the object can be easily clamped, the working efficiency of the clamp can be sufficiently improved.

  Moreover, according to this clamp type sensor 1, it rotates with the rotation locus | trajectory which becomes axisymmetric in planar view state by making the straight line L which passes along the top part Ra of the annular body R and the center part Rb of the annular body R into a symmetrical line. Since each second clamp arm 21 is configured, the detection target can be clamped by each second clamp arm 21 on the straight line L, that is, in the central portion (right and left central portions) of the annular body R in a plan view state. The current detection accuracy can be sufficiently improved.

  Moreover, according to this clamp type sensor 1, since both the 1st clamp arms 11 were comprised so that rotation was possible, when clamping a detection target, since front-end | tip part B1 can be largely separated, detection is carried out. As a result that the object can be easily clamped, the working efficiency of the clamp can be sufficiently improved.

  Further, according to the clamp type sensor 1, both the second clamp arm 21 and the first clamp arm 11 are interlocked with the rotation operation (the operation of pushing the lever C <b> 2 of the second clamp arm 21) with respect to the second clamp arm 21. By being configured to rotate, the operability can be sufficiently improved.

The configuration of the clamp type sensor is not limited to the above configuration. For example, although it described above about the example which comprised both the 1st clamp arms 11 so that rotation was possible, the structure which fixes any one 1st clamp arm 11 (any one 1st clamp arm 11 does not rotate) Configuration) can also be adopted .

  Further, the example in which the detection electrode 22 is disposed only on one of the second clamp arms 21 (second clamp arm 21 a) has been described above. However, the configuration in which the detection electrodes 22 are disposed on both the second clamp arms 21 is described. It can also be adopted.

  In addition, the example in which each second clamp arm 21 is configured so as to rotate along a rotational locus that is symmetric with respect to a straight line L passing through the top portion Ra of the annular body R and the center portion Rb of the annular body R is described above. However, it is also possible to employ a configuration in which each of the second clamp arms 21 rotates along an asymmetric rotation locus with respect to the straight line L.

  Further, the example in which both the second clamp arm 21 and the first clamp arm 11 are rotated in conjunction with the rotation operation with respect to the second clamp arm 21 has been described above, but the rotation with respect to the first clamp arm 11 is described. It is possible to employ a configuration in which both the first clamp arm 11 and the second clamp arm 21 rotate in conjunction with the operation. Moreover, the structure which performs separately the rotation operation which rotates the 1st clamp arm 11, and the rotation operation which rotates the 2nd clamp arm 21 is also employable.

  Further, the example in which both the first clamp arm 11a and the second clamp arm 21a are pivotally supported by the support shaft 5a and both the first clamp arm 11b and the second clamp arm 21b are supported by the support shaft 5b has been described above. The first clamp arm 11a and the second clamp arm 21a are separately supported by two different support shafts (first support shaft and second support shaft), and the first clamp arm 11b and the second clamp arm 21b are supported by two different support shafts. It is also possible to adopt a configuration in which the shafts (first support shaft and second support shaft) are separately supported. Further, it is possible to adopt a configuration in which all of the first clamp arms 11a and 11b and the second clamp arms 21a and 21b are supported by one support shaft that functions as the first support shaft and the second support shaft.

DESCRIPTION OF SYMBOLS 1 Clamp type sensor 2 Main-body part 3 1st sensor part 4 2nd sensor part 5a, 5b Spindle 11a, 11b 1st clamp arm 21a, 21b 2nd clamp arm 200 Electric wire A1, A2 Base end part B1, B2 Tip part C1 , C2 Lever L Straight line F Inner circumference R Annular body Ra Top part Rb Center part

Claims (4)

A clamp-type sensor including a first sensor unit that detects a current flowing through a detection target and a second sensor unit that detects a voltage of the detection target,
The first sensor unit includes a pair of first clamp arms disposed on the main body, and at least one of the first clamp arms has a base end portion pivotally supported on the main body by a first support shaft. It is configured to be rotatable with respect to the main body as a center, and in a state of being clamped so as to surround the detection target with the first clamp arms, the distal ends engage with each other to form an annular body and Detecting the current in a clamped state,
The second sensor unit includes a pair of second clamp arms disposed on the main body, and both bases of the second clamp arms are pivotally supported on the main body by a second support shaft. Each of the second clamp arms is configured to be rotatable with respect to the main body as a center, and the detection target is located at a position inside the annular body in a plan view and spaced apart from the first clamp arms. A clamp type sensor that clamps and clamps the voltage and detects the voltage in the clamped state. Each of the second clamp arms is rotationally symmetric in the plan view with a straight line passing through the top of the annular body and the center of the annular body where the distal end side of the first clamp arm is positioned as a symmetry line The clamp type sensor according to claim 1 , wherein the clamp type sensor is configured to rotate with respect to the main body along a locus. The clamp type sensor according to claim 1 or 2, wherein each of the first clamp arms is configured to be rotatable with respect to the main body . The first clamp arm and the second clamp arm that can rotate are both linked to a rotation operation on one of the first clamp arm and the second clamp arm, and both the first clamp arm and the second clamp arm. The clamp type sensor according to any one of claims 1 to 3 , wherein each is configured to rotate with respect to the main body .

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