HK1146815B - Wireless data transmitting and receiving system - Google Patents

Description

Wireless data transmitting and receiving system

Technical Field

The present invention relates to a wireless data transmission and reception system that detects a torque and/or a rotation angle from a torque sensor and/or a rotation angle sensor disposed on a rotation shaft of a fastening machine that fastens a bolt, a nut, a screw, or the like, and transmits the detected torque and/or rotation angle to a data reception unit by wireless.

Background

In a tightening machine that performs tightening by a torque method, a current value of a power machine, which is a load of the power machine, is detected, and then the tightening torque is controlled using the current value as an index. In the method of detecting the current value and controlling the fastening torque, when the current value varies according to a change in voltage or the like, an accurate fastening torque cannot be obtained. Further, since the power is transmitted from the power machine to the rotary shaft via the speed reduction mechanism, the fastening torque is affected by the transmission efficiency of the speed reduction mechanism. That is, since the tightening machine having the same tightening torque as the relative current value as the new tightening machine is continuously used, adaptation to the speed reduction mechanism is exhibited, and if the transmission efficiency of the speed reduction mechanism becomes high, the tightening torque with respect to the same current value is improved. Therefore, in order to confirm the actual tightening torque, an additional operation of increasing the tightening with a wrench after the tightening and measuring the torque is required.

In order to solve this problem, it has been proposed to provide a fastening device such as a bolt, a nut, or a screw with a fastening torque measuring means for detecting and displaying a fastening torque (see, for example, patent document 1 (japanese patent application laid-open No. 2006-21272)).

In the fastening machine of patent document 1, the fastening torque measuring unit includes a torque sensor such as an inclinometer and a display device electrically connected to the torque sensor, and the fastening torque measuring unit is directly attached to a rotary shaft of the fastening machine to detect and display the fastening torque.

In the fastening machine of patent document 1, a rotating shaft to which the fastening torque measuring unit is attached is composed of an inner shaft and an outer shaft that are rotatable in opposite directions to each other, and the outer shaft has a reaction force receiving portion at a tip end thereof. The tightening torque measuring means is disposed on the outer shaft to which the reaction force receiving portion is attached. That is, since the fastening torque measuring unit rotates integrally with the outer shaft, the display device may not be seen well because the outer shaft is rotating or in a rotation stop position.

In addition, when a rotating shaft is inserted into the recess, for example, when a bolt of the recess is attached, the fastening torque measuring means may enter the recess, and the fastening torque may not be visible.

That is, in the tightening machine of patent document 1, since the tightening torque measuring means is attached to the outer side portion of the rotating shaft and the display device is provided on the tightening torque measuring means, the display device may not be visible when the tightening machine is moved to a position where the tightening machine cannot be seen or a rotation stop position of the outer shaft. In addition, although the fastening torque measuring means is attached to the outer shaft side, when the inner shaft is actually fastened and the outer bearing receives a reaction force, there may be a difference between the torque acting on the outer shaft and the torque acting on the inner shaft actually fastened.

In the fastening machine of patent document 1, it is necessary to connect the fastening torque measuring unit and the display via a signal line (wired line) in order to display the fastening value detected by the fastening measuring unit on the display provided on the fastening machine main body side. However, since the fastening torque measuring unit rotates together with the rotating shaft, there is a risk that the signal wire is wound around the fastening torque measuring unit or hooked and broken in operation. In addition, since the signal line is likely to carry electrical noise, it is also considered that an accurate torque value cannot be transmitted. Further, although an electric signal transmission mechanism based on a slip ring (lip ring) or the like may be considered, the fastening torque measuring unit itself becomes large, and the operability deteriorates.

In a fastening machine that performs fastening by a rotation angle method, an encoder is attached to a rotation shaft of a power machine, or a slit (slit) plate and a photo interrupter (photo interrupter) are attached to the rotation shaft, so that the rotation speed of the power machine is detected, and the rotation angle of the rotation shaft is controlled using the count value of the rotation speed as an index. In this case, the rotation is also transmitted from the power machine to the rotating shaft through the reduction gear, and is affected by elastic deformation of the reduction gear.

Therefore, the rotation angle of the nut after actual fastening can be roughly confirmed by visual observation, but in order to confirm an accurate fastening angle, an additional operation by an angle gauge or the like needs to be performed after fastening.

Then, in a tightening machine that performs tightening by a torque gradient method, a gradient of torque with respect to a rotation angle of the nut is detected, and a change in the value is controlled as an index.

However, in a fastening machine that fastens by the conventional torque gradient method, as described above, the current of the power machine is used as an index for the torque, and the fastening time is used as an index for the rotation angle, so that the current value of the power machine is detected as a gradient of the current value of the power machine with respect to the fastening time, not a gradient of the torque with respect to the rotation angle of the nut, and the current value of the power machine is controlled using a change in the value as an index, thereby causing a variation in accuracy. In addition, although the tightening confirmation is performed by actually tightening several bolts and plotting the current value of the power machine with respect to the tightening time at that time, it is necessary to connect a device for detecting the tightening time and the current value to the tightening machine every time.

In the conventional fastening machine, when the fastening device is set to a predetermined torque and the bolt that has been fastened is fastened, the bolt is rotated and fastened with a predetermined torque when the bolt is equal to or less than the predetermined torque. However, even when fastening has been performed with a torque equal to or greater than a predetermined torque, if the rotating shaft of the fastening machine reaches the predetermined torque, fastening is terminated without rotating the bolt, and it is determined that fastening has been performed with the predetermined torque.

Disclosure of Invention

The present invention has been made in an effort to provide a wireless data transmission and reception system capable of wirelessly transmitting a signal related to a torque acting on a rotating shaft and/or a rotation angle of the rotating shaft from a data transmission unit disposed on the rotating shaft to a data reception unit.

In order to solve the above problem, a wireless data transmission/reception system according to the present invention includes: a data transmission unit which is arranged on a rotating shaft of the fastening machine and has a function of detecting torque; and a data receiving unit. The data transmission unit includes: a torque sensor configured to detect a torque acting on the rotating shaft; and a transmitting device electrically connected to the torque sensor and wirelessly transmitting a signal relating to the torque detected by the torque sensor; the data receiving unit has: a receiving device that receives a signal relating to torque transmitted from the transmitting device of the data transmitting unit; and a display device for displaying the signal related to the torque received by the receiving device.

The wireless data transmitting/receiving system of the present invention includes: a data transmitting unit provided on a rotating shaft of the tightening machine and having a function of detecting a rotation angle; and a data receiving unit. The data transmission unit includes: a rotation angle sensor configured to detect a rotation angle acting on the rotation shaft; and a transmission device electrically connected to the rotation angle sensor and wirelessly transmitting a signal relating to the rotation angle detected by the rotation angle sensor; the data receiving unit has: a receiving device that receives a signal relating to the rotation angle transmitted from the transmitting device of the data transmitting unit; and a display device for displaying the signal related to the rotation angle received by the receiving unit.

The data receiving unit is preferably disposed in a housing on the main body side of the fastening machine or on a power line for supplying power to the main body, and the fastening machine or the housing is provided with a control circuit for controlling a power machine for rotating the rotary shaft; the control circuit is electrically connected with the receiving device and controls the power machine according to the signals which are received by the receiving device and are related to the torque and/or the rotating angle.

According to the wireless data transmission/reception system of the present invention, the fastening torque acting on the rotary shaft and the rotation angle of the rotary shaft can be directly detected by the data transmission unit directly disposed on the rotary shaft, and the detected fastening torque and the detected rotation angle of the rotary shaft can be transmitted to the outside by the transmission device. The transmitted signals relating to the torque and the rotation angle are received by a receiving device of a data receiving unit that can be arranged at a position integral with the rotation shaft and not rotated, and displayed on a display device.

Since the tightening torque acting on the rotary shaft can be directly detected and displayed, it is not necessary to actually detect the actual tightening torque and confirm the actual tightening torque. In addition, since the rotation angle of the rotating shaft can be directly detected and displayed, it is not necessary to actually measure the rotation angle after fastening.

Since the data receiving unit and the data transmitting unit are separately configured, when the recess is inserted into the rotating shaft and fastened, even if the data transmitting unit is inserted into the recess and cannot be seen, the fastening torque and/or the rotation angle can be displayed on the display device provided on the data receiving unit and can be seen.

The display device is connected to the receiving device, and the display device does not rotate integrally with the rotary shaft, so that problems that the display device cannot be observed due to rotation or stop of the rotary shaft can be solved, and the display device can be accurately fastened while being confirmed.

Further, by transmitting data from the data transmitting means to the data receiving means, there is no connection such as a signal line between the data transmitting means and the data receiving means. Therefore, the operability is not adversely affected. In addition, the influence of electrical noise is small compared to the case of a wire.

Further, since the data transmission unit does not require a display device, the data transmission unit can be made compact and lightweight, and further, since a power source for operating the display device is not required, a battery as the power source can be made compact and have a long life.

Since the tightening torque can be directly detected from the rotating shaft in the tightening machine that performs tightening by the torque method, the tightening by the torque method can be performed more accurately than the control by the current value of the power machine by using the tightening torque for the control.

Since the rotation angle of the rotation angle can be directly detected in the fastening machine that performs fastening by the rotation angle method, fastening by the rotation angle method can be performed more accurately than performing control based on the rotation speed of the rotation shaft of the power machine by using the rotation angle for control.

Since the tightening torque and the rotation angle can be directly detected from the rotation shaft in the tightening machine that performs tightening by the torque gradient method, the tightening by the original torque gradient method can be performed by detecting the torque with respect to the rotation angle and using the change in the value of the torque with respect to the rotation angle for control, and the gradient of the current value of the power machine with respect to the tightening time can be detected. Further, since signals of the torque and the rotation angle are transmitted from 1 data transmission unit, the torque and the rotation angle can be synchronized. Further, since the rotation angle can be detected, the rotation speed can also be detected from the fastening time and the rotation angle.

In a fastening machine capable of directly detecting a fastening torque and a rotation angle from a rotation shaft, when the fastening machine is set to a predetermined torque and fastening of the fastened torque is performed, if the bolt is equal to or less than the predetermined torque, the bolt is rotated and fastened with the predetermined torque. However, when tightening is performed with a torque equal to or greater than a predetermined torque, the rotary shaft of the tightening machine does not rotate even if the predetermined torque is reached. Therefore, by detecting whether or not the rotation shaft of the torque tightening machine rotates from the start of tightening, it can be determined whether or not tightening is acceptable: the bolt is fastened within a predetermined torque range or fastened with a torque equal to or higher than a predetermined torque. And a buzzer, a lamp and the like are connected with the receiving unit as a notification device, so that when the fastening is performed with the torque more than the predetermined torque, the operator can know the failure through sound and light, and the operator can easily recognize the torque more than the predetermined torque. When the torque is equal to or higher than the predetermined torque, the tightening machine is once reversed to loosen the bolt and is rotated again in the normal direction, so that the tightening can be corrected to the predetermined torque.

In addition, by providing or connecting a storage device such as a personal computer and an external memory to the receiving device, signals relating to the torque and/or the rotation angle can be stored, managed, and outputted. Thereby, it is possible to remotely store, manage, and output the fastening state of the bolt or the like. In particular, when fastening is performed by the torque gradient method, it is not necessary to connect a device for detecting a current value or the like to a fastening machine in order to confirm the fastening.

Further, when the receiver is disposed in the tightening machine, the setting switch is connected to the receiver, and a desired tightening torque is input in advance through the setting switch, the received signal relating to the torque is fed back to the power control of the power machine of the tightening machine, whereby the tightening of the bolt or the like can be performed with the desired tightening torque. This enables more accurate fastening than torque detection based on load detection of the power machine or the like.

Drawings

FIG. 1 is a block diagram of a wireless data transceiving system of the present invention;

fig. 2 is a block diagram of a data transmission unit;

fig. 3 is a block diagram of a wireless data transmitting and receiving system in which a display device is applied to a data receiving unit;

fig. 4 is a plan view showing an embodiment of the present invention applied to a manual wrench;

fig. 5 is a block diagram of a data receiving unit to which the display device is applied;

fig. 6 is a block diagram of a wireless data transceiving system in which a personal computer is applied to a data receiving unit;

fig. 7 is a block diagram of a data receiving unit to which a personal computer is applied;

fig. 8 is a schematic diagram of a case where a plurality of wireless data transmission and reception systems are used;

fig. 9 is a block diagram of a wireless data transmission and reception system adapted to a fastening machine equipped with a data receiving unit;

FIG. 10 is a block diagram of a fastening machine loaded with a data receiving unit;

FIG. 11 is a partial cross-sectional view showing an embodiment of the invention applied to a fastening machine having a thin wrench;

fig. 12 is a partial sectional view showing an embodiment in which the present invention is applied to a manual wrench.

Detailed Description

As shown in fig. 1, the wireless data transmission/reception system (10) of the present invention is composed of a data transmission/reception unit (20) disposed on a rotating shaft (52) of a fastener (50), and a data reception unit (30) that receives a torque-related wireless signal from the data transmission unit (20) and performs various operations.

In the present specification, "rotation shaft (52)" of the tightening machine (50) includes a rotation shaft in the case of a single shaft or various shafts that rotate along with the rotation thereof, and in the case of a biaxial tightening machine (50) composed of an inner shaft and an outer shaft as described in the background art, these shafts and various shafts that rotate along with the rotation thereof are included. A reaction force receiving part (53) may be attached to the rotating shaft (52).

In the following description, it is described that both the torque acting on the rotating shaft (52) and the rotation angle of the rotating shaft (52) can be detected in the data transmission unit (20), but it is needless to say that only one of them can be detected.

As shown in fig. 1, the data transmission unit (20) is accommodated in a cylindrical housing (20a) detachably or fixedly attached to a rotary shaft (52) of a fastener (50). By making the data transmission unit (20) detachable, there is an advantage that the data transmission unit (20) can be replaced with only a spare data transmission unit (not shown) when the data transmission unit (20) has a problem. In addition, it is not necessary to provide the same number of data transmission units (20) and fastening devices (50) as a set, which is economical.

As shown in fig. 2, the data transmission unit (20) is mainly configured by a torque sensor (21), a rotation angle sensor (29), and a transmission device (22) that transmits a signal relating to torque and/or a rotation angle output from the torque sensor (21) and the rotation angle sensor (29).

The torque sensor (21) electrically detects a torque acting on the rotating shaft (52), and may be, for example, an inclinometer (not shown) mounted on the rotating shaft (52).

A change in torque generated in the rotating shaft (52) is output from the torque sensor (21) as a torque-related signal. For example, in the case of an inclinometer, a change in torque generated in a rotating shaft (52) is detected as a change in impedance and output as a change in voltage.

When the rotating shaft (52) is composed of an outer shaft and an inner shaft, the torque sensor (21) is attached to either the outer shaft or the inner shaft. In addition, when the reaction force receiving portion (53) is provided on the outer shaft, a difference in torque may occur between the shaft to which the reaction force receiving portion (53) is attached and the shaft to which the fastening is actually performed. Therefore, in this case, it is preferable to attach the data transmission unit (20) to the inner shaft side where the fastening is actually performed, whereby more accurate fastening torque can be detected as compared with the case where the data transmission unit is attached to the outer shaft side.

The rotation angle sensor (29) electrically detects the rotation angle of the rotating shaft (52), and for example, an encoder, a gyro sensor, a photo interrupter, or a magnetic sensor mounted on the rotating shaft (52) or on the rotating shaft (52) and a non-rotating portion can be exemplified. In either case, the rotation angle sensor (29) is mounted on the shaft that is actually fastened.

The rotation angle of the rotating shaft (52) is output from a rotation angle sensor (29) as a signal relating to the rotation angle. For example, in the case of an encoder, an encoding pulse is output as a signal relating to the rotation angle of the rotating shaft (52). In the case of a gyro sensor, the absolute angular velocity output is output as a signal relating to the rotation angle of the rotating shaft (52). In the case of a photo interrupter, the light emitted from the light emitting section is detected by the light receiving section, and the rotation of the rotating shaft (52) is output as a digital signal.

The signals output from the torque sensor (21) and the rotation angle sensor (29) are transmitted to a transmission device (22). The transmission device (22) includes a CPU (23), an RF (radio frequency) circuit (24) for transmission, and an antenna (25) for transmission. A battery (not shown) as a power source is mounted on the housing (20a), and power is supplied to each device.

An amplifier circuit (27) and an A/D converter (28) are disposed between a torque sensor (21) and a CPU (23) of a transmitter (22), a signal relating to torque output from the torque sensor (21) is amplified by the amplifier circuit (27), and is A/D converted by the A/D converter (28) and then transmitted to the CPU (23).

The rotation angle sensor (29) may be connected to directly send a signal to the CPU (23) in the case of being a device that outputs a digital signal like an encoder. In the case of an apparatus that outputs an analog signal, the analog signal is amplified by an a/D converter (not shown) and, if necessary, an amplifier circuit (not shown), and the amplified analog signal is a/D converted by the a/D converter (not shown) and then sent to the CPU (23).

The CPU (23) wirelessly transmits signals relating to the torque and the rotation angle from the RF circuit (24) via the antenna (25). When the antenna (25) is positioned on the opposite side of the data receiving unit (30) due to the rotation of the data transmitting unit (20), the carrier wave (radio wave, infrared ray, etc.) may be cut off. In this case, since the data transmitting unit (20) is provided with a plurality of antennas (25) at predetermined angular intervals, one of the antennas (25) can be positioned on the data receiving unit (30) side, and thus reliable transmission can be performed without carrier interruption.

Furthermore, since the data transmission means (20) is directly disposed on the rotating shaft (52), the fastening torque acting on the rotating shaft (52) or the rotation angle of the rotating shaft (52) can be directly detected, and therefore, even in a fastening machine (50) in which a speed reduction mechanism (not shown) is disposed between the rotating shaft (52) and a power machine (motor (54)), the accurate fastening torque and the rotation angle of the rotating shaft (52) can be detected without being affected by the efficiency change, elastic deformation, or the like of the speed reduction mechanism.

The signal can be transmitted wirelessly from the data transmission unit (20) by radio waves or infrared rays. In addition, a configuration using a wireless LAN and a personal wireless network (WPAN) may be used.

The transmitted torque-related signal and the rotation angle-related signal are received by the data receiving unit (30) shown in fig. 1. The data receiving unit (30) may be provided separately from the fastening machine (50) or may be attached to the fastening machine (50) by being fixed thereto with screws or the like, as will be described later. In addition, the tightening machine (50) may be provided integrally.

As shown in fig. 5, the data receiving unit (30) includes a receiving antenna (35) for receiving, an RF circuit (34) for receiving, and a CPU (33) as a receiving device (32). The received torque-related signal may be transmitted to the CPU (33) via the antenna (35) and the RF circuit (34), and the torque-related signal is converted into a torque value, or various control, storage, management, output, and the like based on the torque are performed.

Similarly, the received signal relating to the rotation angle may be transmitted to the CPU (33) via the antenna (35) and the RF circuit (34), and the signal relating to the rotation angle may be converted into a rotation angle value, or various controls, storages, management, and outputs based on the rotation angle may be performed.

The received signals relating to torque and rotation angle can be displayed on a display device (40) which is electrically connected to the receiving device (32). Thus, the received torque-related signal and the received rotation angle-related signal can be seen as the torque value and the angle value.

The power supply to the data receiving unit (30) may be a battery or an industrial power supply.

The figures show various embodiments of a data receiving unit (30).

As shown in fig. 1, the data receiving unit (30) may be provided integrally with the fastening machine (50). In this case, the data receiving means (30) is preferably provided in a power line for supplying power to a power machine (for example, a motor (54)) for rotating a rotating shaft (52) of the tightening machine (50), and is electrically connected to a control circuit for controlling the power machine and the receiving device (32). Thus, the power machine (motor (54)) can be feedback-controlled or the like on the basis of the signal relating to the torque and/or the signal relating to the rotation angle received by the receiving device (32).

As shown in fig. 3, the data receiving unit (30) may be provided separately from the fastening machine (50). In this case, as the display device (40), as shown in fig. 3, a Liquid Crystal Display (LCD) may be exemplified, which can be made to display the measured torque value and/or the rotation angle.

A data receiving unit (30) having a display device (40) can create a desired character size and shape, and can appropriately set the size, color, display time, and the like of a torque value and/or a rotation angle to be displayed. Further, the shape may be a wristwatch.

The display device (40) can be fixed, vertically placed, suspended, and the like at a position easily visible to an operator, so that the operator can fix a bolt or the like to a desired torque value and/or rotation angle while viewing the display device (40).

Since the power supply of the display device (40) can be disposed separately from the data transmission unit (20), the battery or the like disposed on the data transmission unit (20) can be made compact and the life can be prolonged.

As shown in fig. 4, the tightening machine is not limited to the electric type, and may be applied to a manual tightening machine (50). In this case, by mounting the display device (40) at a position easily visible to the operator, for example, a handle portion (57) fixed to the fastening side according to the portion where the operator grips the handle, the operator can fasten a bolt or the like to a desired torque value and/or rotation angle while adjusting the input while looking at the display device (40).

The data receiving unit (30) may be connected to the personal computer (42) as shown in fig. 6 and 7, or may be partially or entirely built in the personal computer (42). The illustrated example is an embodiment in which the data receiving unit (30) is connected to a personal computer (42) by wired communication (37).

The torque-related signal received is processed by the personal computer (42) to be converted into a torque value, and the fastening torque of the bolt or the like is stored in a storage device built in or connected to the personal computer (42) to be managed or outputted. In addition, a monitor of a personal computer (42) can be used as the display device (40). Furthermore, a signal relating to the torque and/or a signal relating to the angle of rotation may be fed back to the tightening machine (50) to control the tightening machine (50).

Further, by inserting the identification signal of the data transmission unit (20) into the signal relating to the torque and/or the signal relating to the rotation angle transmitted from the data transmission unit (20) of each fastening machine (50), as shown in fig. 8, when a plurality of fastening machines (50) are used, the torque value and/or the rotation angle can be identified and displayed and stored using the plurality of data transmission units (20) and the plurality of data reception units (30), respectively.

By installing a GPS (global positioning system) function on the data transmission unit (20), for example, when fastening bolts of bridges or the like, it is possible to record and manage the situation that each bolt is fastened at a predetermined torque value and/or rotation angle. In addition, the date and time may also be recorded at the same time.

The received torque value and/or rotation angle may be plotted by the personal computer (42), and the tightening process may be monitored to determine whether or not an abnormality occurs during tightening.

As shown in fig. 9 and 10, the data receiving unit (30) may be directly attached to a clamp portion (56) or the like of the tightening machine (50), and the tightening torque value and/or the rotation angle may be observed, or the motor (54) as the power machine of the tightening machine (50) may be controlled based on the received torque value and/or rotation angle.

As an example, as shown in fig. 9, a display device (40) and a switch (58) for setting a desired tightening machine and/or rotation angle are disposed on the tightening machine (50), and as shown in fig. 10, the display device (40) and the setting switch (58) are connected to the CPU (33) of the data receiving unit (30), and further, a motor control circuit (44) for supplying power to the motor (54) of the tightening machine (50) and the CPU (33) are connected via a D/a converter (46).

In addition, by inputting a desired tightening torque or a desired rotation angle in advance by the setting switch (58), when the received torque value reaches the desired tightening torque or rotation angle, a command is issued from the CPU (33) to the motor control circuit (44) to cut off the energization of the motor (54), or when the desired tightening torque or rotation angle is approached, the power supplied to the motor (54) is reduced to perform deceleration control. In this case, the input torque value and/or the rotation angle may be displayed on the display device (40).

According to the above, since the motor (54) can be controlled by directly detecting the fastening torque from the rotating shaft (52), it is possible to perform fastening with an accurate fastening torque, compared to the case where the fastening torque is controlled by load detection of the motor.

Fig. 11 shows an embodiment of a fastening machine (50) to which a thin wrench (60) is attached. The thin wrench (60) has a fastening insertion hole (62) at a position different from the rotation center of the insertion hole (59) of the fastening device (50). The insertion hole (59) and the fastening insertion hole (62) are connected by a gear mechanism (64).

The data transmission unit (20) is disposed inside the wrench (60), and the data reception unit (30) is fixed to the tightening machine (50).

When a tightening machine (50) having the wrench (60) of this configuration is tightened, the tightening torque is wirelessly transmitted from the data transmission unit (20) to the data reception unit (30), and the tightening torque and/or the rotation angle is observed through the display device (40) on the tightening machine (50) side, or the motor (54) that is the power machine of the tightening machine (50) is controlled based on the received torque value and/or rotation angle.

Fig. 12 shows an embodiment in which the present invention is applied to a fastening machine (50) including a manual wrench (51) and a booster (70). The booster (70) has a planetary gear mechanism (72), and a reaction force receiving section (76) is disposed on the distal end outer cylinder (74).

The data transmission unit (20) is disposed inside the booster (70), and the data reception unit (30) is attached to the handle portion (57) of the wrench (51).

In the wrench (51) of this configuration, a user can manually fasten a bolt or the like by holding the handle (57), thereby wirelessly transmitting the fastening torque from the data transmission unit (20) to the data reception unit (30), and observing the fastening torque through the display device (70) of the handle (57).

In the above embodiment, the motor (54) is exemplified as the power machine, but the power machine is not limited to an electric type, and an air pressure type or a hydraulic type may be used.

The present invention is useful as a wireless data transmission and reception system capable of detecting a fastening torque and/or a rotation angle of a rotary shaft directly from the rotary shaft of a fastening machine, transmitting and receiving the fastening torque and/or the rotation angle wirelessly, feeding the fastening torque and/or the rotation angle back to the fastening machine, transmitting the fastening torque and/or the rotation angle to a personal computer or the like, and performing various control signals.

Claims (15)

1. A wireless data transceiving system, comprising:

a data transmission unit (20) which is provided on an inner shaft of a fastening machine (50) having a rotating shaft (52) constituted by an inner shaft and an outer shaft which are rotatable in opposite directions to each other, and which has a function of detecting torque, the data transmission unit (20) comprising: a torque sensor (21) configured to detect a torque acting on the inner shaft; and a transmission device (22) which is electrically connected to the torque sensor (21) and wirelessly transmits a signal relating to the torque detected by the torque sensor (21); and

a data receiving unit (30) having: a receiving device (32) that receives a signal relating to torque transmitted from a transmitting device (22) of the data transmitting unit (20); and a display device (40) for displaying the torque-related signal received by the receiving device (32).

2. The wireless data transceiving system of claim 1, wherein:

the data transmission unit (20) further has a rotation angle sensor (29), the rotation angle sensor (29) being configured to detect a rotation angle of the rotating shaft and being electrically connected to the transmission device (22),

the transmission device (22) wirelessly transmits a signal relating to the rotation angle detected by the rotation angle sensor (29),

the data receiving unit (30) has: a receiving device (32) that receives a signal relating to the rotation angle transmitted from a transmitting device (22) of the data transmitting unit (20); and a display device (40) for displaying the signal related to the rotation angle.

3. The wireless data transceiving system of claim 1, wherein:

the data receiving unit (30) is fixed to the body of the fastening machine (50).

4. The wireless data transceiving system of claim 1, wherein:

the data receiving unit (30) is disposed in a housing on the main body side of the tightening machine (50) or on a power line for supplying power to the main body, and a control circuit for controlling a power machine for rotating the rotating shaft (52) is provided in the tightening machine or the housing,

the control circuit is electrically connected with the receiving device (32) and controls the power machine according to the signal which is received by the receiving device (32) and is related to the torque.

5. The wireless data transceiving system of claim 1, wherein:

the data receiving unit (30) has a notifying means for determining whether the torque is appropriate or not based on the signal relating to the torque received by the receiving means (32) and notifying the determination result of the appropriateness or not.

6. The wireless data transceiving system of claim 2, wherein:

the data receiving unit (30) is disposed in a housing on the main body side of the tightening machine (50) or on a power line for supplying power to the main body, and a control circuit for controlling a power machine for rotating the rotating shaft (52) is provided in the tightening machine or the housing,

the control circuit is electrically connected with the receiving device (32) and controls the power machine according to the signal related to the rotating angle received by the receiving device (32).

7. The wireless data transceiving system of claim 2, wherein:

the data receiving unit (30) has a notifying means for determining whether the rotation angle is appropriate based on the signal relating to the rotation angle received by the receiving means (32) and notifying the determination result of whether the rotation angle is appropriate.

8. The wireless data transceiving system of claim 1, wherein:

the data transmission unit (20) has a plurality of antennas (25).

9. The wireless data transceiving system of claim 1, wherein:

the data transmitting unit (20) or the data receiving unit (30) has a storage device for storing a signal relating to the torque detected by the torque sensor (21).

10. The wireless data transceiving system of claim 2, wherein:

the data transmitting unit (20) or the data receiving unit (30) stores a signal relating to the rotation angle detected by the rotation angle sensor (29).

11. The wireless data transceiving system of claim 1, wherein:

the data transmission unit (20) is detachable.

12. The wireless data transceiving system of claim 1, wherein:

the data transmission unit (20) has an identification device for identifying the data reception unit (30) itself.

13. The wireless data transceiving system of claim 1, wherein:

a speed reduction mechanism is disposed between the rotating shaft (52) and the power machine (54), and rotation is transmitted from the power machine to the rotating shaft (52) via the speed reduction mechanism.

14. The wireless data transceiving system of claim 1, wherein:

the torque sensor (21) is an inclinometer.

15. The wireless data transceiving system of claim 2, wherein:

the rotation angle sensor (29) is an encoder, a gyro sensor, a photo interrupter, or a magnetic sensor.