JP5508793B2 - Relocation detection device and measuring machine equipped with this relocation detection device - Google Patents

Description

  The present invention relates to a relocation detection device and a measuring machine including the relocation detection device.

2. Description of the Related Art Conventionally, a relocation detection device has been devised that is attached to a stationary device such as a measuring machine and detects the relocation of this stationary device (for example, see Patent Documents 1 and 2). Such a relocation detection apparatus includes a housing and a relocation detection unit that is disposed inside the housing and detects the relocation of the housing.
In the relocation detection device described in Patent Document 1, the relocation detection means detects a sphere, a sphere seating portion including a hole for seating the sphere, and whether or not the sphere is seated on the sphere seating portion. Photosensor. When the stationary device is relocated, the ball is detached from the ball seat by vibration, so the relocation detection device detects that the ball is not seated on the ball seat by the photo sensor. By doing so, it is possible to detect the relocation of the stationary device.
In the transfer detection device described in Patent Document 2, the transfer detection means includes a rotary body configured to be rotatable about a rotary shaft, and a detection unit that detects the rotation of the rotary body. Since the rotating body rotates when the stationary device is moved, the moving detection device detects the movement of the stationary device by detecting the rotation of the rotating body by the detection unit. Can do.

JP 2008-157853 A JP 2008-176443 A

However, for example, in the relocation detection device described in Patent Document 1, if the ball is remodeled so as not to be detached from the ball seat by vibration by filling the inside of the housing with a curable resin or the like, There is a problem that it is impossible to detect the relocation of the mold device.
Further, for example, in the transfer detection device described in Patent Document 2, if the rotary body is modified so that the rotary body does not rotate by fixing the rotary shaft, the transfer of the stationary device cannot be detected. There is a problem.

  An object of the present invention is to provide a relocation detection device capable of detecting whether or not a modification has been made, and a measuring machine including the relocation detection device.

The relocation detection device of the present invention is a relocation detection device that includes a housing and a relocation detection means that is disposed inside the housing and detects the relocation of the housing, wherein the housing is hermetically sealed. In addition, the internal pressure of the casing is a predetermined pressure different from the atmospheric pressure, and the transfer detection device is disposed inside the casing and detects the internal pressure of the casing Control means for controlling the relocation detection means and the pressure detection means, and communication means for communicating information used by the control means to the outside of the casing, the control means comprising the casing A storage unit that stores an initial value of the internal pressure of the body, a pressure acquisition unit that acquires the internal pressure of the housing detected by the pressure detection unit, a predetermined pressure stored in the storage unit, and Based on the internal pressure of the casing acquired by the pressure acquisition unit. Calculating a change amount of the internal pressure of the housing and determining whether or not the change amount is within a predetermined range; and a result of determination by the determination portion is transmitted to the outside of the housing. And a transmission unit for transmitting via the means.

Here, when remodeling the moving detection device by filling the inside of the housing with curable resin or fixing the rotating shaft, etc., disassemble the housing or make a hole in the housing. It is necessary to open it.
According to the present invention, the housing of the relocation detection device is sealed and the internal pressure of the housing is a predetermined pressure different from the atmospheric pressure. If the relocation detection device is modified by opening a hole, the internal pressure of the housing will change.
Therefore, according to the present invention, the control unit includes a determination unit that determines whether or not the internal pressure of the housing has changed, and a transmission unit that transmits a determination result by the determination unit to the outside of the housing via the communication unit. Therefore, the relocation detection device can detect whether or not it has been modified.

  In the present invention, a temperature detection unit is provided in the casing and detects the internal temperature of the casing, and the control unit determines the internal temperature of the casing detected by the temperature detection unit. A temperature acquisition unit to acquire, and a correction unit that corrects the internal pressure of the casing acquired by the pressure acquisition unit based on the internal temperature of the casing acquired by the temperature acquisition unit, The determination unit determines whether the internal pressure of the housing has changed based on the predetermined pressure stored in the storage unit and the internal pressure of the housing corrected by the correction unit. It is preferable to do.

Here, since the internal pressure of the housing also changes depending on the internal temperature of the housing, the internal temperature of the housing when a predetermined pressure is stored in the storage unit and the internal pressure of the housing in the pressure acquisition unit are determined. When the internal temperature of the housing at the time of acquisition is different, there is a problem that the determination unit may erroneously determine whether or not the internal pressure of the housing has changed.
According to the present invention, the control unit obtains the pressure based on the temperature acquisition unit that acquires the internal temperature of the casing detected by the temperature detection unit, and the internal temperature of the casing acquired by the temperature acquisition unit. Since the correction | amendment part which correct | amends the internal pressure of the housing | casing acquired in a part is provided, the precision of the determination by a determination part can be improved.

In this invention, it is preferable that the said control means and the said communication means are arrange | positioned inside the said housing | casing.
According to such a configuration, since the control unit and the communication unit are disposed inside the sealed casing, information used in the control unit and the communication unit is monitored, the control unit, and It is possible to prevent the communication means from being modified. Therefore, the relocation detection device can reliably detect whether or not it has been modified.

In the present invention, it is preferable that the predetermined pressure stored in the storage unit and the determination result transmitted by the transmission unit are encrypted.
According to such a configuration, since the predetermined pressure stored in the storage unit and the determination result transmitted by the transmission unit are encrypted, it is possible to prevent such information from being rewritten. Therefore, the relocation detection device can reliably detect whether or not it has been modified.

The measuring machine according to the present invention includes the above-described relocation detection device.
According to such a configuration, since the measuring instrument includes the above-described transfer detection device, it is possible to achieve the same operational effects as the above-described transfer detection device.

The schematic diagram which shows the measuring device which concerns on 1st Embodiment of this invention. The flowchart which shows the modification detection process of the control means in the said embodiment. The schematic diagram which shows the measuring machine which concerns on 2nd Embodiment of this invention. The flowchart which shows the modification detection process of the control means in the said embodiment.

[First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a measuring instrument 1 according to the first embodiment of the present invention.
The measuring machine 1 is, for example, an installation type device such as a shape measuring machine that measures the shape of an object to be measured, and includes a transfer detection device 2 as shown in FIG.
The relocation detection device 2 detects relocation of the measuring instrument 1, and includes a housing 21, relocation detection means 3, pressure detection means 4, communication means 5, and control means disposed inside the housing 21. 6.
The housing 21 is hermetically sealed, and the internal pressure of the housing 21 is a predetermined pressure different from the atmospheric pressure.

The relocation detection means 3 detects the relocation of the casing 21. For example, similar to the relocation detection device described in Patent Document 1 described above, the relocation detection means 3 includes a sphere, a ball seating portion, and a photosensor. It may be configured to detect the relocation of the housing 21, or may be configured to detect the relocation of the housing 21 with the rotating body and the detection unit, similarly to the relocation detection device described in Patent Document 2 described above. Good.
The pressure detection unit 4 detects the internal pressure of the housing 21. In the present embodiment, the pressure detecting means 4 is constituted by a sensor that detects absolute atmospheric pressure.
The communication means 5 communicates information used by the control means 6 to the outside. In the present embodiment, the communication unit 5 wirelessly communicates information used by the control unit 6 to a processing device (not shown) of the measuring instrument 1.

The control unit 6 includes an MPU (Micro Processing Unit), a rewritable nonvolatile memory, and the like, and controls the entire relocation detection device 2. In the present embodiment, of the functions of the control means 6, the function for executing the modification detection process for detecting whether or not the relocation detection device 2 has been modified is mainly described, and the description of the other functions is omitted. To do.
The control unit 6 includes a storage unit 61, a pressure acquisition unit 62, a determination unit 63, and a transmission unit 64.
The storage unit 61 stores an initial value of the internal pressure of the casing 21, that is, a predetermined pressure different from the atmospheric pressure described above. Specifically, the control means 6 acquires the pressure detected by the pressure detection means 4 by receiving the command from the processing device of the measuring machine 1 described above via the communication means 5 and stores it in the storage unit 61. Let Note that the initial value of the internal pressure stored in the storage unit 61 is encrypted.

The pressure acquisition unit 62 acquires the internal pressure of the casing 21 detected by the pressure detection unit 4.
The determination unit 63 determines the internal pressure of the housing 21 based on the initial value of the internal pressure of the housing 21 stored in the storage unit 61 and the internal pressure of the housing 21 acquired by the pressure acquisition unit 62. Determine if it has changed.
The transmission unit 64 transmits the determination result by the determination unit 63 to the processing device of the measuring instrument 1 described above, that is, to the outside of the housing 21 via the communication unit 5. Note that the determination result transmitted by the transmission unit 64 is encrypted.

FIG. 2 is a flowchart showing the modification detection process of the control means 6.
When the modification detection process is executed, the control unit 6 executes the following steps S1 to S3 as shown in FIG. The control means 6 repeatedly executes the modification detection process at predetermined intervals.
First, the pressure acquisition part 62 acquires the internal pressure of the housing | casing 21 detected by the pressure detection means 4 (S1: pressure acquisition step).

When the internal pressure of the housing 21 is acquired in the pressure acquisition step S <b> 1, the determination unit 63 is acquired by the initial value of the internal pressure of the housing 21 stored in the storage unit 61 and the pressure acquisition unit 62. Based on the internal pressure of the casing 21, it is determined whether or not the internal pressure of the casing 21 has changed (S2: determination step).
Specifically, the determination unit 63 calculates the difference between the initial value P0 of the internal pressure of the housing 21 stored in the storage unit 61 and the internal pressure Pc of the housing 21 acquired by the pressure acquisition unit 62. Thus, the change amount Pd of the internal pressure of the casing 21 is calculated (S21: change amount calculation step).
When the change amount Pd of the internal pressure of the casing 21 is calculated in the change amount calculation step S21, the determination unit 63 determines whether or not the change amount Pd is within a certain range determined by the lower limit threshold and the upper limit threshold. Is determined to determine whether the internal pressure of the housing 21 has changed (S22: change amount determination step).
When it is determined whether or not the internal pressure of the housing 21 has changed in the change amount determination step S22, the transmission unit 64 communicates the determination result by the determination unit 63 to the processing device of the measuring instrument 1 described above. It transmits via the means 5 (S3: transmission step). Specifically, when it is determined in the change amount determination step S22 that the internal pressure of the housing 21 has changed, the transmission unit 64 transmits detection information indicating that the relocation detection device 2 has been modified (S31). Detection information transmission step), when it is determined that the internal pressure of the housing 21 has not changed, the transmission unit 64 transmits undetected information indicating that the remodeling of the relocation detection device 2 is not detected ( S32: Undetected information transmission step).

According to this embodiment, there are the following effects.
(1) The control unit 6 determines whether or not the internal pressure of the casing 21 has changed, and transmits the determination result by the determination unit 63 to the outside of the casing 21 via the communication unit 5. Since the unit 64 is provided, the relocation detection device 2 can detect whether or not it has been modified.
(2) Since the control means 6 and the communication means 5 are disposed inside the sealed casing 21, information used in the control means 6 and the communication means 5 can be monitored, or the control means 6, Further, the communication means 5 can be prevented from being modified. Therefore, the relocation detection device 2 can reliably detect whether or not it has been modified.

(3) Since the predetermined pressure stored in the storage unit 61 and the determination result transmitted by the transmission unit 64 are encrypted, rewriting of such information can be prevented. Therefore, the relocation detection device 2 can reliably detect whether or not it has been modified.
(4) Since the transmission unit 64 transmits undetected information indicating that the remodeling of the relocation detection device 2 is not detected in the undetected information transmission step S32, the relocation detection device 2 includes the pressure detection means 4, communication It is possible to detect whether the means 5 and the control means 6 are operating normally.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
FIG. 3 is a schematic diagram showing a measuring instrument 1A according to the second embodiment of the present invention.
In the present embodiment, as shown in FIG. 3, the measuring machine 1 </ b> A includes a relocation detection device 2 </ b> A. The relocation detection device 2 </ b> A is disposed inside the control unit 6 </ b> A and the housing 21. It differs from the said 1st Embodiment by the point provided with the temperature detection means 7 which detects temperature. In the following description, parts that have already been described are assigned the same reference numerals and description thereof is omitted.

The control unit 6A includes a storage unit 61A, a pressure acquisition unit 62, a determination unit 63A, a transmission unit 64, a temperature acquisition unit 65, and a correction unit 66.
The storage unit 61 </ b> A stores an initial value of the internal pressure of the housing 21 and stores an initial value of the internal temperature of the housing 21. Specifically, the control means 6A receives the command from the processing device of the measuring machine 1A described above via the communication means 5, and detects the pressure detected by the pressure detection means 4 and the temperature detection means 7. Is obtained and stored in the storage unit 61A. Note that the initial value of the internal pressure and the initial value of the internal temperature stored in the storage unit 61A are encrypted.

The temperature acquisition unit 65 acquires the internal temperature of the casing 21 detected by the temperature detection unit 7.
The correction unit 66 corrects the internal pressure of the casing 21 acquired by the pressure acquisition unit 62 based on the internal temperature of the casing 21 acquired by the temperature acquisition unit 65.
The determination unit 63A then determines the internal pressure of the housing 21 based on the initial value of the internal pressure of the housing 21 stored in the storage unit 61A and the internal pressure of the housing 21 corrected by the correction unit 66. It is determined whether or not has changed.

FIG. 4 is a flowchart showing a modification detection process of the control means 6A.
When the modification detection process is executed, the control means 6A executes the following steps S1 to S3 as shown in FIG. The control means 6A repeatedly executes the modification detection process at a predetermined interval.
First, the pressure acquisition part 62 acquires the internal pressure of the housing | casing 21 detected by the pressure detection means 4 similarly to the said 1st Embodiment (S1: Pressure acquisition step).

When the internal pressure of the casing 21 is acquired in the pressure acquisition step S1, the temperature acquisition unit 65 acquires the internal temperature of the casing 21 detected by the temperature detection means 7 (S10: temperature acquisition step).
When the internal temperature of the casing 21 is acquired in the temperature acquisition step S <b> 10, the correction unit 66 is acquired by the pressure acquisition unit 62 based on the internal temperature of the casing 21 acquired by the temperature acquisition unit 65. The internal pressure of the casing 21 is corrected (S11: correction step).

  Here, the volume 21 of the gas is inversely proportional to the pressure P and proportional to the absolute temperature T, and Boyle-Charles' law (PV / T = constant) and the casing 21 are sealed. Based on the condition that the gas volume V inside the housing 21 is constant even when the internal temperature of the housing 21 changes, the following equation (1) is established.

  P0 / T0 = Pc / Tc (1)

In the above-described equation (1), P0 is an initial value of the internal pressure of the casing 21 stored in the storage unit 61A, and Pc is an internal pressure of the casing 21 acquired by the pressure acquisition unit 62. T0 is the initial value of the internal temperature of the casing 21 stored in the storage unit 61A, and Tc is the internal temperature of the casing 21 acquired by the temperature acquisition unit 65.
Therefore, the correction unit 66 calculates the correction value Px of the internal pressure of the housing 21 based on the following formula (2).

  Px = T0 · Pc / Tc (2)

When the correction value Px of the internal pressure of the casing 21 is calculated in the correction step S11, the determination unit 63A uses the initial value P0 of the internal pressure of the casing 21 stored in the storage unit 61 and the correction unit 66. Based on the calculated correction value Px, it is determined whether or not the internal pressure of the housing 21 has changed (S2: determination step).
Specifically, the determination unit 63 </ b> A calculates the difference between the initial value P <b> 0 of the internal pressure of the housing 21 stored in the storage unit 61 and the correction value Px calculated by the correction unit 66 to thereby determine the housing 21. The amount of change Pd of the internal pressure is calculated (S211: change amount calculation step).
Then, the control means 6A executes the change amount determination step S22 and the transmission step S3 as in the first embodiment.

In this embodiment as well, the same operations and effects as those of the first embodiment can be achieved, and the following operations and effects can be achieved.
(5) The control unit 6A is based on the temperature acquisition unit 65 that acquires the internal temperature of the casing 21 detected by the temperature detection unit 7 and the internal temperature of the casing 21 acquired by the temperature acquisition unit 65. The correction unit 66 for correcting the internal pressure of the casing 21 acquired by the pressure acquisition unit 62 is provided, so that the accuracy of determination by the determination unit 63A can be improved.

[Modification of Embodiment]
Note that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope in which the object of the present invention can be achieved are included in the present invention.
For example, in each of the above embodiments, the control means 6, 6 </ b> A and the communication means 5 are disposed inside the housing 21, but may be disposed outside the housing 21.
In each said embodiment, although the initial value of the internal pressure memorize | stored in the memory | storage parts 61 and 61A and the determination result transmitted in the transmission part 64 were encrypted, it does not need to be encrypted.
In each of the above embodiments, the relocation detection devices 2 and 2A are attached to the measuring machines 1 and 1A, but may be attached to other installation-type devices such as machine tools.
In each of the above embodiments, the transmission unit 64 transmits undetected information indicating that the relocation detection device 2 has not been modified, but only detection information indicating that the relocation detection device 2 has been remodeled. May be sent.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a relocation detection device and a measuring machine equipped with this relocation detection device.

DESCRIPTION OF SYMBOLS 1,1A ... Measuring machine 2, 2A ... Transfer detection device 3 ... Transfer detection means 4 ... Pressure detection means 5 ... Communication means 6, 6A ... Control means 7 ... Temperature detection means 21 ... Case 61, 61A ... Memory | storage part 62 ... Pressure acquisition unit 63, 63A ... Determination unit 64 ... Transmission unit 65 ... Temperature acquisition unit 66 ... Correction unit

Claims (5)

A relocation detecting device comprising a housing and a relocation detecting means disposed within the housing for detecting relocation of the housing,
The housing is sealed, and the internal pressure of the housing is a predetermined pressure different from atmospheric pressure,
The relocation detection device is:
A pressure detecting means disposed inside the housing for detecting an internal pressure of the housing;
Control means for controlling the relocation detection means and the pressure detection means;
Communication means for communicating information used in the control means to the outside of the housing,
The control means includes
A storage unit for storing an initial value of the internal pressure of the housing;
A pressure acquisition unit for acquiring an internal pressure of the casing detected by the pressure detection unit;
A change amount of the internal pressure of the housing is calculated based on the predetermined pressure stored in the storage unit and the internal pressure of the housing acquired by the pressure acquisition unit, and the change amount is predetermined. A determination unit that determines whether or not it is within the range of
A relocation detection apparatus comprising: a transmission unit configured to transmit a determination result by the determination unit to the outside of the housing via the communication unit. In the relocation detection apparatus according to claim 1,
A temperature detection means disposed inside the housing for detecting the internal temperature of the housing;
The control means includes
A temperature acquisition unit for acquiring an internal temperature of the casing detected by the temperature detection unit;
A correction unit that corrects the internal pressure of the casing acquired by the pressure acquisition unit based on the internal temperature of the casing acquired by the temperature acquisition unit;
The determination unit determines whether the internal pressure of the housing has changed based on the predetermined pressure stored in the storage unit and the internal pressure of the housing corrected by the correction unit. A relocation detection apparatus characterized by: In the relocation detection apparatus according to claim 1 or 2,
The relocation detection apparatus, wherein the control means and the communication means are disposed inside the casing. In the moving detection apparatus in any one of Claims 1-3,
The relocation detection apparatus, wherein the predetermined pressure stored in the storage unit and the determination result transmitted by the transmission unit are encrypted.   A measuring machine comprising the relocation detecting device according to any one of claims 1 to 4.

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