JP2019035614A - Gap measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause a problem that the measurement accuracy of a gap dimension is lowered because the relationship between the length of an elastic body and the load detected by a load cell changes due to the permanent deformation of the elastic body due to a long-term load. A gap measuring device according to an embodiment of the present invention is a gap measuring device that measures a gap between a first surface and a second surface facing each other, and is a gap measuring device of the first surface and the second surface. A first magnetic flux generation source arranged between them, a second magnetic flux generation source arranged between the first surface and the second surface, and arranged to face the first magnetic flux generation source, and the first magnetic flux generation source. It includes a magnetic flux measuring device that measures the magnetic force generated by one magnetic flux generating source and the second magnetic flux generating source, and a distance calculating device that calculates a distance based on the magnetic force measured by the magnetic flux measuring device. [Selection diagram] Fig. 1

Description

  The present invention relates to a gap measuring device that measures the distance between two surfaces facing each other.

  An apparatus for measuring the distance between two surfaces facing each other has been developed. For example, Patent Document 1 discloses an apparatus for measuring the distance between a vehicle door and a body panel facing each other. Specifically, in the gap dimension measuring device described in Patent Document 1, a spring and a load cell are housed inside a case that can be expanded and contracted in the measurement direction, and the load cell detects the tension of the spring. That is, the size of the gap is detected. In this case, the spring exerts an elastic force in a direction in which the case is pressed against the wall surface forming the gap when the gap is measured.

Japanese Utility Model Publication No. 6-49950

  However, in the device described in Patent Document 1, when a load acts on the elastic body for a long time, the elastic body is permanently deformed. Thereby, since the relationship between the length of the elastic body and the load detected by the load cell changes, there arises a problem that the measurement accuracy of the gap dimension is lowered.

  Accordingly, an object of the present invention is to provide a gap measuring device capable of suppressing a decrease in gap dimension measurement accuracy.

  A gap measuring device according to an embodiment of the present invention is a gap measuring device that measures a gap between a first surface and a second surface facing each other, and is a first device disposed between the first surface and the second surface. A first magnetic flux generation source; a second magnetic flux generation source disposed between the first surface and the second surface; and disposed opposite to the first magnetic flux generation source; a first magnetic flux generation source and a second magnetic flux generation source And a distance calculation device for calculating a distance based on the magnetic force measured by the magnetic force measurement device.

  In the gap measuring apparatus according to the embodiment of the present invention, a first member that contacts the first surface and receives a force from the first magnetic flux generation source, and a first member that contacts the second surface and receives a force from the second magnetic flux generation source. The first member and the second member may be separated from each other by a magnetic force generated by the first magnetic flux generation source and the second magnetic flux generation source.

  In the gap measurement device according to the embodiment of the present invention, the first magnetic flux generation source and the second magnetic flux generation source may be permanent magnets and may be arranged so that the same poles face each other.

  In the gap measuring device according to the embodiment of the present invention, at least one of the first magnetic flux generation source and the second magnetic flux generation source may be an electromagnet capable of switching the magnitude of the generated magnetic flux.

  In the gap measuring device according to one embodiment of the present invention, the magnetic force measuring device may be a load measuring device that measures a load caused by a magnetic force received from the first magnetic flux generator or the second magnetic flux generator.

  In the gap measuring device according to one embodiment of the present invention, the distance calculating device may identify the distance based on the magnetic force measured by the magnetic force measuring device with reference to the correspondence relationship between the magnetic force and the distance stored in advance. .

  According to the present invention, since a magnetic force is used instead of an elastic force of an elastic body that generates permanent deformation, it is possible to provide a gap measuring device that can suppress a decrease in measurement accuracy of a gap dimension.

It is a figure showing an example of composition of a gap measurement system in a 1st embodiment. It is a figure which shows sectional drawing of the gap | interval measuring apparatus in 1st Embodiment. It is a flowchart which shows the operation example of the gap | interval measuring system in 1st Embodiment. It is a flowchart which shows the other operation example of the gap | interval measuring system in 1st Embodiment. It is an example of the graph which shows the relationship between the load in 1st Embodiment, and the distance between surfaces. It is another figure which shows the structural example of the gap | interval measuring apparatus in 2nd Embodiment. It is another figure which shows the structural example of the gap | interval measuring apparatus in 3rd Embodiment. It is another figure which shows the structural example of the gap | interval measuring apparatus in 4th Embodiment.

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

<First Embodiment>
FIG. 1 is a diagram illustrating a configuration example of a gap measurement system 1 according to the first embodiment. As shown in FIG. 1, the gap measurement system 1 includes a gap measurement unit 10, a control unit 30, and a display 37.

(Configuration of the gap measuring unit 10)
As shown in FIG. 1, the gap measuring unit 10 includes a first member 11 and a second member 12. The first member 11 and the second member 12 are cylindrical members provided with an opening having one end opened. The openings of the first member 11 and the second member 12 are slidably coupled to each other in the direction in which the distance between the first member 11 and the second member 12 changes. By this, a housing is formed. A third member 13, a load cell 20, a first magnetic flux generation source 21, and a second magnetic flux generation source 22 are stored inside the housing.

  Each of the first member 11 and the second member 12 includes a bottom portion and a wall portion extending from the bottom portion. The shape of the bottom is, for example, a disk shape or a square shape. The shapes of the bottom of the first member 11 and the bottom of the second member 12 may be different from each other. For example, the bottom of the first member 11 is a disc shape, and the bottom of the second member 12 is a square shape. Or vice versa. Moreover, the bottom part of the 1st member 11 and the bottom part of the 2nd member 12 are formed so that it may become mutually parallel.

  The gap measuring unit 10 includes a load cell 20 that is in contact with the bottom of the second member 12 and measures a load as a magnetic force measuring device. The load cell 20 can measure the load, for example, by converting the load into the magnitude of an electric signal. The gap measuring unit 10 can calculate the inter-surface distance based on the load measured by the load cell 20. A method for calculating the inter-surface distance from the load will be described later. The magnetic force measuring device is not limited to the load cell 20 that converts a load into a magnitude of an electric signal, and any device that can measure magnetic force may be used. The load cell 20 outputs an electrical signal corresponding to the load to the control unit 30.

  In the gap measuring unit 10, the load cell 20 is disposed between the bottom of the second member 12 and the third member 13. The third member 13 includes surfaces that are parallel to each of the bottom of the first member 11 and the bottom of the second member 12. That is, the surface included in the third member 13 is perpendicular to the sliding direction of the first member 11 and the second member 12. The surface included in the third member 13 is, for example, a disk-shaped or quadrangular surface.

  The gap measuring unit 10 includes a first magnetic flux generation source 21 that contacts the bottom of the first member 11 and a second magnetic flux generation source 22 that contacts the third member 13. As illustrated in FIG. 1, the first magnetic flux generation source 21 is formed by a surface opposite to one surface of the measurement target (that is, the first member 11 and the second member 12) at the bottom of the first member 11. Provided on the inner surface of the casing. Further, the second magnetic flux generation source 22 is provided on the surface of the third member 13 opposite to the surface in contact with the load cell 20. As a result, as illustrated in FIG. 1, the first magnetic flux generation source 21 and the second magnetic flux generation source 22 are provided to face each other. Here, the first magnetic flux generation source 21 and the second magnetic flux generation source 22 are, for example, permanent magnets or electromagnets, and are members that generate magnetic flux. The first magnetic flux generation source 21 and the second magnetic flux generation source 22 are not limited to these examples, and may be any member as long as magnetic flux can be generated. The first magnetic flux generation source 21 and the second magnetic flux generation source 22 generate an attractive force when different poles face each other, and generate a repulsive force when the same poles face each other.

  As illustrated in FIG. 1, the bottom of the first member 11, the third member 13, and the bottom of the second member 12 are provided in this order between the two surfaces to be measured. A load cell 20 is provided between the surface of the third member 13 and the bottom of the second member 12. Further, a first magnetic flux generation source 21 is provided at the bottom of the first member 11, and a second magnetic flux generation source 22 is provided at the third member 13 so as to face each other.

(Configuration example of control unit 30)
The gap measurement system 1 includes a control unit 30 and a display 37 as a distance calculation device. As illustrated in FIG. 1, the control unit 30 includes an A / D converter 31, an input port 32, a bus 33, a calculation unit 34, a storage unit 35, and an output port 36.

  The A / D converter 31 has a function of converting an analog electric signal into a digital electric signal. The A / D converter 31 converts the analog electrical signal from the load cell 20 into a digital electrical signal and inputs the digital electrical signal to the input port 32.

  The input port 32 receives a digital electric signal input from the A / D converter 31. The input port 32 receives an input of a digital electric signal related to the load measured by the load cell 20 and transmits it to the computing unit 34 via the bus 33.

  The bus 33 is a path for each element (such as the input port 32 and the arithmetic unit 34) to exchange data and the like in the control unit 30. Each of the input port 32, the calculation unit 34, the storage unit 35, and the output port 36 transmits and receives data and the like via the bus 33.

  The calculation unit 34 calculates or specifies the gap distance L based on a digital electric signal related to the load measured by the load cell 20 input from the input port 32 via the bus 33. For example, the calculation unit 34 calculates the gap distance L from the digital electric signal related to the load based on a predetermined method. For example, the calculation unit 34 may specify the inter-magnet distance d corresponding to the digital electric signal related to the load with reference to the storage unit 35 and then calculate the gap distance L. The calculation unit 34 is realized by, for example, a central processing unit (CPU), a microprocessor (microprocessor), an application-specific integrated circuit (ASIC), or a field programmable gate array (FPGA).

  The memory | storage part 35 memorize | stores the relationship between the load (electric signal) which a load cell detects, and the distance d between magnets. The storage unit 35 may store a relationship between a load (electric signal) detected by the load cell and the gap distance L. The storage unit 35 is realized by an HDD (Hard Disk Drive), an SSD (Solid State Drive), a flash memory, a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.

  The output port 36 has a function of outputting data related to the gap distance L received from the calculation unit 34 via the bus 33 to the display 37.

  The display 37 displays the data regarding the gap distance L received from the output port 36 in a predetermined format. The display device 37 is realized by, for example, a liquid crystal display or OELD (Organic Electroluminescence Display).

  FIG. 2 is a diagram illustrating a configuration example of the gap measurement unit 10 according to the first embodiment. Hereinafter, as shown in FIG. 2, a method for measuring the distance between the first surface 41 to be measured and the second surface 42 by the gap measurement unit 10 in the first embodiment will be described. Here, in the present embodiment, the first surface 41 corresponds to, for example, a predetermined surface of a body in an automobile, and the second surface 42 corresponds to a predetermined surface of the door. The first surface 41 and the second surface 42 are merely examples, and the first surface 41 and the second surface 42 may correspond to any surface.

  The gap measuring unit 10 is provided with a first permanent magnet as the first magnetic flux generation source 21 and a second permanent magnet as the second magnetic flux generation source 22. Moreover, in this embodiment, since the same pole is facing the 1st magnetic flux generation source 21 and the 2nd magnetic flux generation source 22, repulsive force works mutually. Since both the sliding direction of the first member 21 and the second member 22 and the direction in which the repulsive force acts are perpendicular to the bottoms of the first member 21 and the second member 22, the first member 21 and the second member 22. Are subjected to repulsive forces in directions away from each other. That is, the first member 21 and the second member 22 are maintained so that the distance becomes as long as possible. In other words, the housing is kept as long as possible. Since the gap is measured by bringing such a case into contact with both the first surface 41 and the second surface 42 that form the gap to be measured, the gap to be measured is larger than the maximum length of the case. When is short, the gap can be measured.

  The gap measuring unit 10 is disposed between the first surface 41 and the second surface 42 while being compressed in the sliding direction of the first member 21 and the second member 22. The first member 21 and the second member 22 are separated from each other by the magnetic force generated by the first magnetic flux generation source and the second magnetic flux generation source, so that the first member 21 contacts the first surface 41 and the second The member 22 contacts the second surface 42. Here, it is preferable that the bottom of the first member 11 and the bottom of the second member 12 are formed in parallel to each other. In such a form, the first member 21 and the second member 22 can contact the first surface 41 and the second surface 42 in a wide range, so that the first member 21 and the second member 22 are stable. The gap can be measured with high accuracy.

  Here, based on a distance L between the first surface 41 and the second surface 42 (hereinafter, this distance L is referred to as an inter-surface distance L), a first magnetic flux generation source provided at the bottom of the first member 11. A distance d between the (first permanent magnet) 21 and the second magnetic flux generation source (second permanent magnet) 22 provided on the surface of the third member 13 is determined. Therefore, the second magnetic flux generation source (second permanent magnet) 22 is caused by the magnetic force (repulsive force) between the first magnetic flux generation source (first permanent magnet) 21 and the second magnetic flux generation source (second permanent magnet) 22. A force in the direction of pressing the second surface 42 is applied to the third member 13 in contact, and a load F is applied to the load cell 20 in contact with the third member 13.

  Therefore, the load F applied to the load cell 20 is measured, and based on the measured load F, the first magnetic flux generation source (first permanent magnet) 21 provided at the bottom of the first member 11 and the third member 13 A distance d from the second magnetic flux generation source (second permanent magnet) 22 provided on the surface is calculated. Then, the inter-surface distance L is calculated (or specified) from the calculated distance d.

(Operation example of the control unit 30)
FIG. 3 is a flowchart showing an operation example when the control unit 30 calculates the inter-surface distance L from the load applied to the load cell 20.

  As shown in FIG. 3, the load cell 20 detects the load F (S101). The load F is converted into a digital electric signal by the A / D converter 31 and input to the arithmetic unit 34 via the input port 32 and the bus 33.

  Subsequently, the calculation unit 34 of the control unit 30 subtracts a force f0 other than magnetic force such as gravity of the second magnetic flux generation source (second permanent magnet) 22 from the load F (S102). Thereby, the calculation unit 34 measures the magnetic force F ′ between the first magnetic flux generation source (first permanent magnet) 21 and the second magnetic flux generation source (second permanent magnet) 22.

  Next, the calculation unit 34 of the control unit 30 calculates the distance d between the first magnetic flux generation source 21 and the second magnetic flux generation source 22 based on Equation 1 (S103). In Equation 1, k is a proportional constant of Coulomb's law, m1 is a magnetic amount of a permanent magnet that is the first magnetic flux generation source (first permanent magnet) 21, and m2 is a second magnetic flux generation source (second permanent magnet). 22 is the magnetic amount of the permanent magnet.

  Finally, with respect to the distance d between the first magnetic flux generation source 21 and the second magnetic flux generation source 22, the thickness of the first magnetic flux generation source 21 (first permanent magnet) and the second magnetic flux generation source (second permanent generation). Magnet) 22, the thickness of the first member 11, the thickness of the second member 12, and D, which is the total value of the size of the load cell 20, are added, and the first surface 41 and the second object to be measured A distance L between the surfaces 42 is calculated (S104).

(Other operation examples of the calculation unit 34)
FIG. 4 is a flowchart showing another operation example when the calculation unit 34 calculates the inter-surface distance L from the load applied to the load cell 20.

  As shown in FIG. 4, in the calculation unit 34, the load cell 20 detects the load F (S101). The load F is converted into a digital electric signal by the A / D converter 31 and input to the arithmetic unit 34 via the input port 32 and the bus 33.

  Thereafter, the calculation unit 34 specifies the distance L between the first surface 41 and the second surface 42 to be measured with reference to the storage unit 35 in which the correspondence relationship between the load F and the inter-surface distance L is stored. (S102). The calculation unit 34 refers to the storage unit 35 and specifies the inter-surface distance L corresponding to the load F.

(Example of map stored in storage unit 35)
FIG. 5 is an example of a map showing the relationship between the load F and the inter-surface distance L stored in the storage unit 35. The relationship between the load F and the inter-surface distance L is given by, for example, a monotonically decreasing graph, where the vertical axis represents the load F and the horizontal axis represents the inter-surface distance L. The calculation unit 34 can specify the inter-surface distance L from the load F by referring to the map stored in the storage unit 35. Specifically, the calculation unit 34 refers to the correspondence relationship between the load F and the inter-surface distance L illustrated in FIG. 5, and calculates the distance L between the first surface 41 and the second surface 42 to be measured. Can be identified.

  As described above, the gap measurement unit 10 of the first embodiment measures the gap between the first surface 41 and the second surface 42 facing each other, and is disposed between the first surface 41 and the second surface 42. The first magnetic flux generation source (first permanent magnet) 21, the second magnetic flux generation source (first permanent magnet) 21 disposed between the first surface 41 and the second surface 42 and facing the first magnetic flux generation source 21 ( 2nd permanent magnet) 22. Then, a magnetic force measurement device (load cell) 20 that measures the magnetic force generated by the first magnetic flux generation source and the second magnetic flux generation source, and a distance calculation that calculates the inter-surface distance L based on the magnetic force measured by the magnetic force measurement device. Device (control unit) 30. As described above, since the gap measuring unit of the first embodiment measures the inter-surface distance L using the magnetic force, not the elastic force of the elastic body in which permanent deformation occurs, it suppresses a decrease in the measurement accuracy of the gap dimension. it can.

  In addition, since the first member 11 and the second member 12 are separated from each other, when the gap measuring unit 10 is disposed between the first surface 41 and the second surface 42, the first member 11 and the second member 12 are The first surface 41 and the second surface 42 are stably contacted, and the measurement accuracy is improved. In addition, since the first magnetic flux generation source 21 and the second magnetic flux generation source 22, which are permanent magnets, are arranged so that the same poles face each other, the first member 11 and the first magnetic member 11 are connected to the first member 11 while reducing the size of the gap measurement unit 10. It is possible to increase the measurement accuracy by separating the two members 12. Moreover, since it measures with the load cell 20, the physique of the gap | interval measurement part 10 can be made small. Furthermore, since the storage unit 35 stores the correspondence between the magnetic force and the distance, the calculation of the gap distance is simplified by specifying the gap distance based on the stored correspondence.

<Second Embodiment>
FIG. 6 is a diagram illustrating a configuration example of the gap measurement unit 10 according to the second embodiment. The gap measuring unit 10 in the second embodiment is a form in which an electromagnet is used instead of a permanent magnet.

  As illustrated in FIG. 6, the second magnetic flux generation source 22 is an electromagnet. The electromagnet has a coil formed around a core made of a magnetic material, and generates a magnetic flux in a direction perpendicular to the winding direction of the coil when a current is applied to the coil. In the present embodiment, the second magnetic flux generation source 22 that is an electromagnet is connected to a power source 38 and a changeover switch 39 as illustrated in FIG.

  The power source 38 is a battery in this embodiment. The power source 38 may be anything as long as it can supply current to the second magnetic flux generation source 22 that is an electromagnet. Here, the power source 38 is preferably a DC power source. This is because during the measurement of the inter-surface distance L, it is possible to measure with higher accuracy when the magnetic flux is continuously generated in one direction. In addition, the changeover switch 39 has a function of supplying a current to the second magnetic flux generation source 22 that is an electromagnet to generate a magnetic flux when switched to an energized state. In the gap measuring unit 10 in the second embodiment, when measuring the inter-surface distance L, the changeover switch 39 is switched to the energized state to supply a current to the second magnetic flux generation source 22 that is an electromagnet, thereby generating a magnetic flux. generate.

  As illustrated in FIG. 6, the gap measurement unit 10 measures the inter-surface distance L between the first surface 41 and the second surface 42. Note that the gap measurement unit 10 does not directly determine the inter-surface distance L, but from the distance d between the first magnetic flux generation source (permanent magnet) 21 and the second magnetic flux generation source (electromagnet) 22. The distance L is obtained. Instead of the second magnetic flux generation source 22, the first magnetic flux generation source 21 may be an electromagnet, and both the first magnetic flux generation source 21 and the second magnetic flux generation source 22 may be electromagnets.

  The bottom of the first member 11 of the gap measuring unit 10 is in contact with the first surface 41 to be measured. On the other hand, the bottom of the second member 12 of the gap measuring unit 10 is in contact with the second surface 42 to be measured. The first member 11 and the second member 12 slide in a direction perpendicular to the first surface 41 and the second surface 42 according to the inter-surface distance (L) between the first surface 41 and the second surface 42. Is possible.

  One end of the load cell 20 is in contact with the opposite side of the second surface 42 at the bottom of the second member 12. The other end of the load cell 20 is in contact with the third member 13. That is, the load cell 20 is provided between the second member 12 and the third member 13. In the third member 13, a second magnetic flux generation source (electromagnet) 22 is provided on the opposite side of the load cell 20. The second member 12, the load cell 20, the third member 13, and the second magnetic flux generation source (electromagnet) 22 are integrated with each other and perpendicular to the second surface 42 (and the first surface 41). Is slidable.

  A first magnetic flux generation source (permanent magnet) 21 is provided on the opposite side of the first surface 41 at the bottom of the first member 11. As a result, as illustrated in FIG. 2, the first magnetic flux generation source (permanent magnet) 21 and the second magnetic flux generation source (electromagnet) 22 are provided facing each other at a position separated by a distance d. The first magnetic flux generation source (permanent magnet) 21 and the second magnetic flux generation source (electromagnet) 22 face the same pole, and repulsive force acts on both.

  Hereinafter, as shown in FIG. 6, a method for measuring the distance between the first surface 41 to be measured and the second surface 42 by the gap measurement unit 10 in the second embodiment will be described. First, the gap measuring unit 10 is disposed between the first surface 41 and the second surface 42 in a state where the changeover switch 39 is switched to a state in which no power is supplied. At this time, since no current is applied to the electromagnet, no repulsive force is generated between the first magnetic flux generation source 21 and the second magnetic flux generation source 22, and the distance between the first member 11 and the second member 12 is increased. The shortest state is maintained. For this reason, the gap measuring unit 10 is arranged between the first surface 41 and the second surface 42 without applying a force in a direction to shrink the gap measuring unit 10 by the measurer.

  The changeover switch 39 switches to the energized state when measuring the distance between the first surface 41 to be measured and the second surface 42. As a result, the bottom of the first member 11 is in contact with the first surface 41, and the bottom of the second member 12 is in contact with the second surface 42, so that the first surface 41 to be measured and the second surface 42 are in contact with each other. The distance is measured.

  Here, based on the distance L between the first surface 41 and the second surface 42, the first magnetic flux generation source (permanent magnet) 21 provided at the bottom of the first member 11 and the surface of the third member 13 are provided. The second magnetic flux generation source (electromagnet) 22 is determined. Therefore, due to the magnetic force (repulsive force) between the first magnetic flux generation source (permanent magnet) 21 and the second magnetic flux generation source (electromagnet) 22, the second magnetic flux generation source (electromagnet) 22 contacts the surface of the third member 13. On the other hand, a force in the direction of the second surface 42 is applied, and a load F is applied to the load cell 20 in contact with the surface of the third member 13.

  Therefore, the load F applied to the load cell 20 is measured, and the first magnetic flux generation source (permanent magnet) 21 provided at the bottom of the first member 11 and the surface of the third member 13 are measured based on the measured load F. A distance d from the provided second magnetic flux generation source (electromagnet) 22 is calculated. Then, the inter-surface distance L is calculated (or specified) from the calculated distance d.

  As described above, in the gap measuring device of the second embodiment, at least one of the first magnetic flux generation source (permanent magnet) 21 and the second magnetic flux generation source (electromagnet) 22 switches the magnitude of the generated magnetic flux. An electromagnet that can.

  Since an electromagnet is used as the magnetic flux generation source 22, the gap measuring unit 10 can be disposed between the first surface 41 and the second surface 42 without generating magnetic flux. And after providing the electromagnet as the magnetic flux generation source 22 in the gap | interval measurement part 10, the usage which makes the said electromagnet generate | occur | produce a magnetic flux by energizing the changeover switch 33 is possible. As described above, since the gap measurement unit 10 can be disposed between the first surface 41 and the second surface 42 without generating magnetic flux, the measurement location (the first surface 41 and the second surface 41) of the gap measurement unit 10 can be used. It is easy to dispose it between the surface 42).

  Thus, the gap measurement system 1 of the second embodiment can measure the inter-surface distance L by generating magnetic flux using an electromagnet. For this reason, the gap measurement system 1 of the second embodiment uses a magnetic force generated by an electromagnet rather than an elastic force of an elastic body in which permanent deformation occurs, and therefore can suppress a reduction in measurement accuracy of the gap dimension.

<Third Embodiment>
FIG. 7 is a diagram illustrating a configuration example of the gap measurement unit 10 according to the third embodiment. In the gap measurement unit 10 in the third embodiment, the first magnetic flux generation source 21 and the second magnetic flux generation source 22 have different poles facing each other, and an attractive force acts on both. In the third embodiment, the first magnetic flux generation source 21 and the second magnetic flux generation source 22 may be permanent magnets or electromagnets.

  As illustrated in FIG. 7, the gap measuring unit 10 measures the inter-surface distance L between the first surface 41 and the second surface 42. The gap measuring unit 10 does not directly determine the inter-surface distance L, but determines the inter-surface distance L from the distance d between the first magnetic flux generation source 21 and the second magnetic flux generation source 22.

  The bottom of the first member 11 of the gap measuring unit 10 is in contact with the first surface 41 to be measured. On the other hand, the bottom of the second member 12 of the gap measuring unit 10 is in contact with the second surface 42 to be measured. The first member 11 and the second member 12 are slidable in a direction perpendicular to the first surface 41 and the second surface 42 according to the inter-surface distance L between the first surface 41 and the second surface 42. is there.

  One end of the load cell 20 is in contact with the opposite side of the second surface 42 at the bottom of the second member 12. The other end of the load cell 20 is in contact with the third member 13. That is, the load cell 20 is provided between the second member 12 and the third member 13. In the third member 13, a second magnetic flux generation source 22 is provided on the opposite side of the load cell 20. The second member 12, the load cell 20, the third member 13, and the second magnetic flux generation source 22 can be slid in a direction perpendicular to the second surface 42 (and the first surface 41) integrally with each other. It is.

  Here, as illustrated in FIG. 7, the first member 11 is provided with a bottom portion in contact with the first surface 41 and a holding portion facing the bottom portion, and the first magnetic flux generation source 21 is provided in the holding portion. On the other hand, the third member 13 is provided with a bottom portion in contact with the load cell 20 and a holding portion facing the bottom portion, and a second magnetic flux generation source 22 is provided at the holding portion. The first member 11 and the third member 13 are provided at positions where the first member 11 and the third member 13 are engaged (fitted) so that the holding portion of the third member 13 is positioned between the bottom portion and the holding portion of the first member 11. It is done. That is, in the gap measurement unit 10, as illustrated in FIG. 7, the bottom portion of the first member 11 that is in contact with the first surface 41, the third member 13, the holding portion where the second magnetic flux generation source 22 is provided, The holding part where the first magnetic flux generation source 21 is provided in the member 11 and the bottom part where the load cell 20 is in contact with the third member 13 are arranged in this order in two surfaces (first surface 41 and second surface 42). Between.

  In the gap measurement unit 10 of the third embodiment, the first magnetic flux generation source 21 and the second magnetic flux generation source 22 have different poles facing each other, and attractive force acts on both. As a result, as illustrated in FIG. 7, in the first member 11, the magnetic force in the first surface 41 direction acts on the surface on which the first magnetic flux generation source 21 is provided. On the other hand, in the third member 13, the magnetic force in the direction of the second surface 42 acts on the surface on which the second magnetic flux generation source 22 is provided. As a result, a force in the direction of the second surface 42 is applied to the entire third member 13, and a load F is applied to the load cell 20 in contact with the surface of the third member 13.

  Therefore, the load F applied to the load cell 20 is measured, and the first magnetic flux generation source (permanent magnet) 21 provided at the bottom of the first member 11 and the surface of the third member 13 are measured based on the measured load F. The distance d between the provided second magnetic flux generation source (permanent magnet) 22 is calculated. Then, the inter-surface distance L is calculated (or specified) from the calculated distance d.

  As described above, in the gap measurement system 1 of the third embodiment, the first magnetic flux generation source 21 and the second magnetic flux generation source 22 face different poles, and attractive force acts on both. As described above, the gap measurement system 1 according to the third embodiment can measure the gap distance based on the attractive force acting between the first magnetic flux generation source 21 and the second magnetic flux generation source 22.

<Fourth Embodiment>
FIG. 8 is a diagram illustrating a configuration example of the gap measurement unit 10 according to the fourth embodiment. The gap measurement unit 10 according to the fourth embodiment is a form in which the first magnetic flux generation source 21 is provided outside the first member 11.

  As illustrated in FIG. 8, the first magnetic flux generation source 21 is located at the bottom of the first member 11 and in contact with one surface of the measurement target (that is, the casing formed by the first member 11 and the second member 12. Outside surface). That is, the first magnetic flux generation source 21 is provided in contact with the first surface 41 to be measured.

  Since the first magnetic flux generation source 21 is provided in the first member 11 so as to be in contact with the first surface 41 to be measured, the size of the gap measurement unit 10 is reduced by the thickness of the first magnetic flux generation source 21. It becomes possible.

  Further, as illustrated in FIG. 8, a “predetermined hole 110” is provided in a portion of the first member 11 of the gap measuring unit 10 that is in contact with the first magnetic flux generation source 21. The predetermined hole 110 causes the first magnetic flux generation source 21 and the second magnetic flux generation source 22 to directly face each other, so that the magnetic force generated between the first magnetic flux generation source 21 and the second magnetic flux generation source 22 is increased. It is provided so as not to be obstructed by the one member 11. The predetermined hole 110 has substantially the same size and shape as the first magnetic flux generation source 21. Further, the predetermined hole 110 does not have to be a complete space (hole), and may be, for example, a mesh shape. The predetermined hole 110 is not necessarily the same size and shape as the size of the first magnetic flux generation source 21, and a part of the first magnetic flux generation source 21 faces the second magnetic flux generation source 22. Any size and shape can be used.

  As illustrated in FIG. 8, the gap measurement unit 10 measures a distance L between the first surface 41 and the second surface 42. The gap measuring unit 10 does not directly determine the inter-surface distance L, but determines the inter-surface distance L from the distance d between the first magnetic flux generation source 21 and the second magnetic flux generation source 22.

  The first magnetic flux generating source 21 provided at the bottom of the first member 11 of the gap measuring unit 10 is in contact with the first surface 41 to be measured. On the other hand, the bottom of the second member 12 of the gap measuring unit 10 is in contact with the second surface 42 to be measured. The first member 11 and the second member 12 are slidable in a direction perpendicular to the first surface 41 and the second surface 42 according to the inter-surface distance L between the first surface 41 and the second surface 42. is there.

  One end of the load cell 20 is in contact with the opposite side of the second surface 42 at the bottom of the second member 12. The other end of the load cell 20 is in contact with the third member 13. That is, the load cell 20 is provided between the second member 12 and the third member 13. In the third member 13, a second magnetic flux generation source 22 is provided on the opposite side of the load cell 20. The second member 12, the load cell 20, the third member 13, and the second magnetic flux generation source 22 can be slid in a direction perpendicular to the second surface 42 (and the first surface 41) integrally with each other. It is.

  A first magnetic flux generation source 21 is provided at the bottom of the first member 11 so as to be in contact with the first surface 41. As illustrated in FIG. 8, the first magnetic flux generation source 21 and the second magnetic flux generation source (permanent magnet) 22 are provided to face each other at a position separated by a distance d through a predetermined hole 110. It is done. The first magnetic flux generation source 21 and the second magnetic flux generation source 22 face the same pole, and a repulsive force acts on both.

  Here, based on the distance L between the first surface 41 and the second surface 42, the first magnetic flux generation source 21 provided at the bottom of the first member 11 and the second magnetic material provided at the surface of the third member 13. The magnetic flux generation source 22 approaches. Therefore, the force in the direction of the second surface 42 with respect to the surface of the third member 13 with which the second magnetic flux generation source 22 contacts due to the magnetic force (repulsive force) between the first magnetic flux generation source 21 and the second magnetic flux generation source 22. And a load F is applied to the load cell 20 in contact with the surface of the third member 13.

  Therefore, the load F applied to the load cell 20 is measured, and on the basis of the measured load F, the first magnetic flux generation source 21 provided at the bottom of the first member 11 and the first provided on the surface of the third member 13 are measured. The distance d between the two magnetic flux generation sources 22 is calculated. Then, the inter-surface distance L is calculated (or specified) from the calculated distance d.

  As described above, the gap measuring unit 10 of the fourth embodiment provides the first magnetic flux generation source 21 by providing the predetermined hole 110 even when the first magnetic flux generation source 21 is in contact with one surface of the measurement target. And the second magnetic flux generation source 22 are directly opposed to each other, so that the magnetic force generated between the first magnetic flux generation source 21 and the second magnetic flux generation source 22 is not disturbed by the first member 11 and the first magnetic flux generation source The inter-surface distance can be measured using the magnetic force between the magnetic flux source 21 and the second magnetic flux generation source 22. As a result, in the gap measuring unit 10 of the fourth embodiment, the first magnetic flux generation source 21 is provided so that the first magnetic flux generation source 21 is in contact with the first surface 41 to be measured in the first member 11. The size of the gap measuring unit 10 can be reduced by the thickness of.

  In the above description, when there are descriptions such as “perpendicular”, “parallel”, and “plane”, these descriptions are not strict meanings. That is, “vertical”, “parallel”, and “plane” allow tolerances and errors in design, manufacturing, etc., and mean “substantially vertical”, “substantially parallel”, and “substantially plane”. . Here, the tolerance and error mean units in a range not departing from the configuration, operation, and effect of the present invention.

  Further, in the above description, when there are descriptions such as “same”, “equal”, “different”, etc., in terms of external dimensions and sizes, these descriptions are not strictly meant. That is, “same”, “equal”, “different” means that tolerances and errors in design, manufacturing, etc. are allowed, and “substantially the same”, “substantially equal”, “substantially different”. . Here, the tolerance and error mean units in a range not departing from the configuration, operation, and effect of the present invention.

DESCRIPTION OF SYMBOLS 1 Gap measurement system 10 Gap measurement part 11 1st member 110 Predetermined hole 12 2nd member 13 3rd member 20 Load cell 21 1st magnetic flux generation source 22 2nd magnetic flux generation source 30 Control unit 31 A / D converter, 32 inputs Port, 33 bus, 34 operation unit, 35 storage unit,
36 Output port, 37 Display 41 First side 42 Second side

Claims (6)

A gap measuring device for measuring a gap between a first surface and a second surface facing each other,
A first magnetic flux generation source disposed between the first surface and the second surface;
A second magnetic flux generation source disposed between the first surface and the second surface and disposed opposite to the first magnetic flux generation source;
A magnetic force measuring device for measuring the magnetic force generated by the first magnetic flux generation source and the second magnetic flux generation source;
A distance calculating device for calculating a distance based on the magnetic force measured by the magnetic force measuring device;
A gap measuring device comprising: A first member that contacts the first surface and receives a force from the first magnetic flux generation source;
A second member in contact with the second surface and receiving a force from the second magnetic flux generation source,
The gap measuring apparatus according to claim 1, wherein the first member and the second member are separated from each other by a magnetic force generated by the first magnetic flux generation source and the second magnetic flux generation source.   The gap measuring device according to claim 1, wherein each of the first magnetic flux generation source and the second magnetic flux generation source is a permanent magnet and is disposed so that the same poles face each other.   The gap measuring device according to claim 1, wherein at least one of the first magnetic flux generation source and the second magnetic flux generation source is an electromagnet capable of switching the magnitude of the generated magnetic flux. The magnetic force measuring device is a load measuring device that measures a load caused by the magnetic force received from the first magnetic flux generation source or the second magnetic flux generation source.
The gap | interval measuring apparatus in any one of Claims 1 thru | or 4.   6. The distance calculation device according to claim 1, wherein the distance calculation device specifies the distance based on a magnetic force measured by the magnetic force measurement device with reference to a correspondence relationship between the magnetic force stored in advance and the distance. Gap measuring device.

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