TWI784844B - Temperature sensing device, and ball screw and thermal distortion suppression system having the same - Google Patents

Abstract

A temperature sensing device, and a ball screw and thermal distortion suppression system having the same are provided. The temperature sensing device can be disposed in a screw of the ball screw and includes a flexible member, a control circuit disposed to the flexible member, and two connecting members respectively connected to two opposite ends of the flexible member. Each connecting member has a first signal transmission end and a first power transmission end. Sensing result of a temperature sensor of the control circuit can be transmitted through the first signal transmission ends. Therefore, providing an individual line to a respective temperature sensing device can be omitted.

Description

Temperature sensing device and ball screw with temperature sensing device and thermal variable shape suppression system

The invention relates to a temperature sensor, in particular to a temperature sensing device, a ball screw with the temperature sensing device and a thermal deformation suppression system.

During the working process, the ball screw will be thermally deformed due to heat, resulting in poor precision. For example, the patent JPA2002361541 discloses a thermal displacement correction method, which is to install a plurality of detection pieces in the hollow screw, and then estimate the thermal expansion of each detection position of the hollow screw according to the temperature detected by each detection piece, and then estimate the position correction amount. However, the rod, elastic body, and temperature sensor to be mounted on the hollow screw are not easy to assemble, and it is necessary to wire the temperature sensor to the controller one by one, so there is a problem of difficult wiring.

To this end, one of the objectives of the present invention is to provide a temperature sensing device and a ball screw with a temperature sensing device and a thermal deformation suppression system. The design of the temperature sensing device allows multiple temperature sensing devices to be connected in series to form a power supply. A transmission channel and a signal transmission channel, thereby saving the work of separately and additionally drawing these temperature sensing devices to the control management terminal.

Another object of the present invention is to provide a temperature sensing device, a ball screw with a temperature sensing device and a thermal deformation suppression system. The design of the temperature sensing device can elastically adjust the number of temperature sensing devices according to the length of the screw.

Another object of the present invention is to provide a temperature sensing device, a ball screw with a temperature sensing device and a thermal deformation suppression system. The design of the temperature sensing device allows the temperature sensors of each temperature sensing device to directly touch To the wall of the accommodating channel of the screw, and then accurately measure the temperature distribution of the screw.

In order to achieve the above and other objects, the present invention provides a temperature sensing device according to an embodiment, which is suitable for being installed in an accommodating channel of a screw, and the temperature sensing device includes: a flexible member; a control circuit , arranged on the flexible member, the control circuit includes a temperature sensor, the temperature sensor is configured to detect the temperature of the screw; two connecting members, respectively connected to the two opposite ends of the flexible member, Each of the connectors is provided with a connection portion, the connection portion is provided with a first signal transmission end and a first power transmission end, the first signal transmission end and the first power transmission end are electrically connected to the control circuit, the first The signal transmission end is further configured to transmit the sensing result of the temperature sensor. In this or other embodiments, one of the connecting parts can cooperate with the other connecting part.

The present invention further provides a ball screw according to an embodiment, comprising: a screw with an accommodating channel; at least two temperature sensing devices as described in claim 1, arranged in series in the accommodating channel; and an end A cover is arranged on the end face of the screw rod to close the accommodating channel. The end cover includes a second signal transmission end, a third signal transmission end, a second power transmission end and a power receiving end. The second signal transmission end end is configured to contact the first signal transmission end of the temperature sensing device closest to the end face, and the second power transmission end is configured to contact the closest The first power transmission end of the temperature sensing device near the end surface, the third signal transmission end is electrically connected to the second signal transmission end and configured to output the sensing results, the power receiving end is electrically connected to the The second power transmission end is configured to receive power supply.

According to another embodiment of the present invention, a thermal deformation suppression system is configured to suppress thermal deformation of a ball screw, the ball screw includes a screw, and the screw is provided with an accommodating channel, the thermal deformation suppression system includes a position controller, The position controller performs position compensation of the screw according to a total displacement, and the thermal deformation suppression system further includes: at least two temperature sensing devices as described in claim 1, arranged in series in the accommodating channel; An end cover is arranged on the end face of the screw rod to close the accommodating channel, the end cover includes a second signal transmission end, a third signal transmission end, a second power transmission end and a power receiving end, the second signal transmission end The transmission end is configured to contact the first signal transmission end of the temperature sensing device closest to the end face, and the second power transmission end is configured to contact the first power transmission end of the temperature sensing device closest to the end face terminal, the third signal transmission terminal is electrically connected to the second signal transmission terminal and configured to output the sensing results, the power receiving terminal is electrically connected to the second power transmission terminal and configured to receive power supply; a power supply device , configured at a position corresponding to the power receiving end, transmitting power to the power receiving end by means of wireless induction or contact power supply; and a terminal processor, electrically connected with the power supply device and communicating with the third signal transmission end, the The terminal processor is configured to control the operation of the power supply device, and receive the sensing results from the third signal transmission end to estimate the total displacement of the screw.

10, 10A, 10B, 10C, S1, S2, S3, Sn: temperature sensing device

11: Flexible parts

111: flexible rib

112: surface

12: Control circuit

121: Temperature sensor

122: Power Manager

13,14: Connectors

131: connection part

132: first signal transmission end

133: the first power transmission end

134: signal electrode

135: Power electrode

141: connection part

142: first signal transmission end

143: the first power transmission end

144: signal electrode

145: Power electrode

20: Ball screw

21: screw

211:Accommodating channel

212: wall

213: end face

22: End cap

23: Transmission connection part

231: Second signal transmission terminal

232: the second power transmission end

233: signal electrode

234: Power electrode

24: fixed part

25: Cover

251: Receiver

252: Power electrode

26: Management circuit

261: The third signal transmission terminal

30: Power supply device

31: Brush

40:Server

41: Terminal processor

50: Position controller

D1: Axial

D2: Radial

Other aspects of the invention and its advantages will be discovered after studying the detailed description in conjunction with the following drawings: Fig. 1 is a schematic diagram of a part of the thermal deformation suppression system according to an embodiment of the present invention; Fig. 2 is an exploded view of a part of the thermal deformation suppression system according to an embodiment of the present invention; Fig. 3 is a temperature diagram according to an embodiment of the present invention A schematic diagram of the sensing device; FIG. 4 is a side view of a temperature sensing device according to an embodiment of the present invention; FIG. 5 is a view of a part of the thermal deformation suppression system according to an embodiment of the present invention along the section line 5-5 in FIG. 1 Sectional view; FIG. 6 is a side view of the end cover of the ball screw according to an embodiment of the present invention; FIG. 7 is a schematic diagram of a power supply device working with a power receiving end according to an embodiment of the present invention; FIG. 8 is a heat sink according to an embodiment of the present invention A functional block diagram of the deformation suppression system; FIG. 9 is a schematic diagram of a power supply device working with a power receiving end according to another embodiment of the present invention; and FIG. 10 is a timing diagram of the working schedule of each temperature sensing device according to an embodiment of the present invention.

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be understood by one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures and/or elements have not been described in detail so as not to obscure the present invention.

Please refer to FIG. 1 to FIG. 5 and FIG. 8, a temperature sensing device 10 provided by the present invention according to an embodiment is adapted to be installed on a screw 21 of a ball screw 20 together with another temperature sensing device 10 Inside a receiving channel 211 , the receiving channel 211 may be, for example but not limited to, a through hole or a blind hole. The temperature sensing device 10 includes a flexible element 11 , a control circuit 12 and two connecting elements 13 and 14 .

The flexible member 11 is made of flexible material, such as but not limited to metal or plastic. In this embodiment, the flexible element 11 is provided with a plurality of flexible ribs 111 , and two adjacent flexible ribs 111 are separated by a distance. However, the present invention is not limited to this embodiment. In other embodiments, the plurality of flexible elements 11 can also be changed to be provided with an elastic piece.

The control circuit 12 is disposed on the flexible member 11 . In this embodiment, the control circuit 12 is realized on a flexible printed circuit board, and the flexible printed circuit board is attached on a flexible rib 111 . The control circuit 12 includes a temperature sensor 121 and a power manager 122 . The power manager 122 is electrically connected to the temperature sensor 121 . The temperature sensor 121 is disposed on a surface 112 of the flexible rib 111 facing the wall 212 of the accommodating channel 211 to detect the temperature of the screw 21 . The power manager 122 is configured to control the power supply of the temperature sensor 121 .

The connecting pieces 13 and 14 are respectively connected to two opposite ends of the flexible piece 11 . The connecting part 13 has a connecting part 131 , and the connecting part 14 also has a connecting part 141 . The connection part 131 is provided with a first signal transmission end 132 and a first power transmission end 133 , and the connection part 141 is also provided with a first signal transmission end 142 and a first power transmission end 143 . In this embodiment, the connecting part 13 may be, for example but not limited to, a socket, and the connecting part 14 may be, for example but not limited to, a plug, so the connecting part 131 is a jack, and the connecting part 141 is a plug-in (transmission terminal). Moreover, in this embodiment, the first signal transmission end 132 includes a pair of signal electrodes 134 arranged on the inner surface of the socket, the first power transmission end 133 includes a pair of power electrodes 135 arranged on the inner surface of the socket, and the first The signal transmission end 142 includes a pair of signal electrodes 144 arranged on the surface of the plug-in, the first power transmission end 143 includes a pair of power electrodes 145 arranged on the surface of the plug-in, the two signal electrodes 134 correspond to the two signal electrodes 144 respectively, and the two power electrodes 135 respectively It corresponds to two pairs of power electrodes 145 , and the signal electrodes and the power electrodes are electrically connected to the control circuit 12 .

With the above-mentioned design of the temperature sensing device 10, as shown in FIGS. The connection part 141 is inserted, and the connection part 141 of the connection part 14 of the temperature sensing device 10A can be inserted into the connection part 131 of the connection part 13 of the temperature sensing device 10C, so that the connection part 13 of the temperature sensing device 10A A pair of signal electrodes 134 and a pair of power electrodes 135 can respectively contact a pair of signal electrodes 144 and a pair of power electrodes 145 of the connector 14 of the temperature sensing device 10B, and a pair of signal electrodes 145 of the connector 14 of the temperature sensing device 10A The electrode 144 and the pair of power electrodes 145 can respectively contact the pair of signal electrodes 134 and the pair of power electrodes 135 of the connecting member 13 of the temperature sensing device 10C. In this way, the three temperature sensing devices 10 can jointly form a signal transmission channel and a power transmission channel, and the signal transmission channel can transmit control commands to the control circuit 12, and transfer the sensing results of the temperature sensor 121 The power transmission channel can supply power to each control circuit 12 .

In this way, a plurality of temperature sensing devices 10 can be connected in series by plugging each other, so that the number of temperature sensing devices 10 can be flexibly adjusted by adapting to screws 21 of different lengths.

When the connecting parts 13 and 14 of the same temperature sensing device 10 are forced close in the axial direction D1, the flexible rib 111 of the flexible part 11 of the temperature sensing device 10 will move in the radial direction D2. The temperature sensor 121 is bent outward so that the temperature sensor 121 contacts the wall 212 of the accommodating channel 211 .

On the other hand, please refer to FIGS. 1 , 2 , 5-6 and 8 , the present invention also provides a ball screw 20 according to an embodiment. The ball screw 20 includes the above-mentioned screw 21 , a nut (not shown) movably sleeved on the screw 21 , a plurality of the above-mentioned temperature sensing devices 10 and an end cover 22 . These temperature sensing devices 10 are arranged in series in the accommodating channel 211 of the screw 21 .

The end cap 22 is disposed on the end surface 213 of the screw 21 to close the accommodating channel 211 . The end cover 22 includes a transmission connection part 23 , a fixing part 24 , a cover part 25 , a management circuit 26 , a second signal transmission end 231 , a second power transmission end 232 and a power receiving end 251 . The fixing part 24 is located between the transmission connection part 23 and the cover part 25 and connects the transmission connection part 23 and the cover part 25 . The fixing part 24 is provided with a first fixing structure (such as but not limited to thread), and the wall surface 212 of the screw 21 close to the end surface 213 is also provided with a second fixing structure (such as but not limited to thread) matching the first fixing structure. , so the fixing portion 24 can be fixed (for example, screwed) to the screw rod 21 to limit the relative displacement between the end cover 22 and the screw rod 21 . When the fixing part 24 is fixed on the screw rod 21 , the cover part 25 can close the accommodating channel 211 of the screw rod 21 .

The second signal transmission end 231 and the second power transmission end 232 are disposed on the transmission connection portion 23 and are electrically connected to the management circuit 26 . In this embodiment, the transmission connection part 23 can be, for example but not limited to, a plug-in, and the second signal transmission end 231 can include a pair of signal electrodes 233, and the second power transmission end 232 can include a pair of power electrodes 234, so when fixed When the part 24 is fixed on the screw rod 21, the transmission connection part 23 can be inserted into the connection part 131 of the connector 13 of the temperature sensing device 10 closest to the end surface 213, so that the two signal electrodes 233 of the second signal transmission end 231 can contact the temperature sensing The pair of signal electrodes 134 of the connector 13 of the device 10 further become a part of the above-mentioned signal transmission channel, and also make the two power electrodes 234 of the second power transmission end 232 contact the pair of power electrodes 135 of the connector 13, and then become a part of the signal transmission channel. Part of the above-mentioned power transmission channel.

At this time, since all the temperature sensing devices 10 inserted into the accommodating channel 211 of the screw 21 will be squeezed in the axial direction D1 of the screw 21, and the flexible member 11 can be flexed, each temperature sensing device The connecting parts 13 and 14 of 10 will be stressed in the axial direction D1 and close to each other, so that the flexible rib 111 of the flexible part 11 will warp outward in the radial direction D2 of the screw rod 21, resulting in flexible The temperature sensor 121 on the curved rib 111 contacts the wall 212 of the accommodating channel 211 of the screw 21 . Thereby, the temperature change of the screw 21 can be detected more accurately. Moreover, the serial connection of the two temperature sensing devices 10 does not restrict the relative rotation of the two temperature sensing devices 10 , so the orientation of the temperature sensors 121 of each temperature sensing device 10 can be adjusted according to requirements.

The power receiving end 251 is provided on the cover portion 25 . In this embodiment, the power receiving terminal 251 may include, for example but not limited to, a pair of power electrodes 252 , and the two power electrodes 252 are electrically connected to the management circuit 26 , so that power can be transmitted to the management circuit 26 . However, the invention is not limited to this example. In other embodiments, the power receiving terminal 251 can also be changed into an induction coil, which can be induced to generate power.

The management circuit 26 is disposed in the cover portion 25 and is electrically connected to the second signal transmission end 231 and the second power transmission end 232 . The management circuit 26 can provide power to each temperature sensing device 10 through the second power transmission end 232 of the circuit transmission channel. Moreover, the management circuit 26 can output control commands to each temperature sensing device 10 through the second signal transmission end 231 of the signal transmission channel, so as to manage the work schedule of each temperature sensing device 10, and collect data through the second signal transmission end 231. Each temperature sensing device 10 provides sensing results, and then collects the collected sensing results. The management circuit 26 includes a third signal transmission end 261 . In this embodiment, the third signal transmission terminal 261 can be, for example but not limited to, a wireless signal transmitter, so the management circuit 26 can organize the aggregation results into packets and send them out through the wireless signal transmitter. However, the third signal transmission end 261 of the present invention is not limited to this example. In other embodiments, the third signal transmission port 261 can also be changed into a signal output port, which outputs the above-mentioned integration results in a wired transmission manner.

An example of the work schedule of each temperature sensing device 10 is shown in FIG. Other physical quantities that can be converted into temperature values), S1 represents the most reliable The temperature sensing device 10 near the end surface 213 of the screw 21 , Sn represents the temperature sensing device 10 farthest from the end surface 213 .

In addition, please refer to FIGS. 1-2 , 5 and 7-8 , the present invention further provides a thermal deformation suppression system according to an embodiment, which is configured to suppress the thermal deformation of the above-mentioned ball screw. The thermal deformation suppression system includes the above-mentioned multiple temperature sensing devices 10 connected in series, the above-mentioned end cap 22 , a power supply device 30 , a server 40 and a position controller 50 . The server 40 has a terminal processor 41 , and the terminal processor 41 can be electrically connected with the power supply device 30 and the position controller 50 .

The power supply device 30 may be configured at a position corresponding to the power receiving terminal 251 . In this embodiment, the power supply device 30 may include, for example but not limited to, two brushes 31, and the two brushes 31 can respectively contact the two power electrodes 252 on the end cover 22, so the terminal processor 41 can control the power supply device 30 to pass through the brushes. 31 supplies power to the power electrode 252 of the end cap 22, thereby supplying power to each temperature sensing device 10. However, the power supply device 30 of the present invention is not limited to this example. In other embodiments, as shown in FIG. 9, in the case where the power receiving end 251 has a coil set, the power supply device 30 can also be provided with another coil set, so the terminal processor 41 can control the power supply device 30 to pass through its coil. The group induces the coil group of the power receiving end 251 , so that the coil group of the power receiving end 251 generates power, thereby supplying power to each temperature sensing device 10 .

In this embodiment, since the third signal transmission terminal 261 is a wireless signal transmitter, the terminal processor 41 can communicate with the third signal transmission terminal 261 through the signal receiver (not shown) of the server 40 to receive the wireless signal. Three packets sent by the signal transmission end 261 to obtain the sensing results of each temperature sensing device 10 , and refer to the ambient temperature value of the machine to estimate the total displacement of the screw 21 .

After receiving the total displacement provided by the terminal processor 41 , the position controller 50 can further perform position compensation of the screw 21 according to the total displacement.

Although the temperature sensing devices in the above embodiments are connected in series in a plug-in manner, and the signal electrodes and the power electrodes are arranged on the plug-ins and the sockets; however, the present invention is not limited thereto. In other embodiments, the connecting parts of the two connecting parts can also be changed to other shapes and structures, as long as the structures of the two connecting parts can match. In other embodiments, the signal electrode or the power electrode can also be arranged on the end surface of the connecting member facing another temperature sensing device instead.

Although the present invention is disclosed above with the aforementioned embodiments, these embodiments are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes, modifications and combinations of implementations are within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended scope of patent application.

10: Temperature sensing device

11: Flexible parts

111: flexible rib

12: Control circuit

121: Temperature sensor

122: Power Manager

13,14: Connectors

131,141: connecting part

134: signal electrode

135: Power electrode

144: signal electrode

145: Power electrode

21: screw

211:Accommodating channel

212: wall

22: End cap

23: Transmission connection part

233: signal electrode

234: Power electrode

24: fixed part

251: Receiver

252: Power electrode

D1: Axial

D2: Radial

Claims (10)

A temperature sensing device is suitable for being installed in an accommodating channel of a screw, and the temperature sensing device includes: a flexible member; a control circuit disposed on the flexible member, the control circuit including a temperature sensor configured to detect the temperature of the screw; and Two connectors, respectively connected to the two opposite ends of the flexible member, each of which is provided with a connecting portion, the connecting portion is provided with a first signal transmission end and a first power transmission end, the first signal transmission end and the first power transmission end The first power transmission end is electrically connected to the control circuit, and the first signal transmission end is further configured to transmit the sensing result of the temperature sensor. The temperature sensing device according to claim 1, wherein when the connecting parts are axially forced and approached, the flexible part warps outward in the radial direction, so that the temperature sensor contacts the The wall surface of the accommodating channel, the axial direction is perpendicular to the radial direction. The temperature sensing device according to claim 1 or 2, wherein the flexible member includes at least one flexible rib, and the temperature sensor is located on the flexible rib. According to the temperature sensing device described in claim 1, each of the first signal transmission terminals is provided with a pair of signal electrodes, and each of the first power transmission terminals is provided with a pair of power electrodes, and the control circuit is electrically connected to the power electrodes and the signal electrodes. The temperature sensing device according to claim 1, wherein the control circuit further includes a power manager, the power manager is electrically connected to the temperature sensor, and the power manager is configured to control the temperature sensor electricity supply. The temperature sensing device according to claim 1, wherein the temperature sensing device is connected in series with another temperature sensing device, wherein the first signal transmission end and the first power transmission end of a connector are configured to contact The first signal transmission end and the first power transmission end of the other temperature sensing device. A ball screw comprising: A screw rod is provided with an accommodating channel; At least two temperature sensing devices as described in claim 1 are arranged in series in the accommodating channel; and An end cover is arranged on the end face of the screw rod to close the accommodating channel, the end cover includes a second signal transmission end, a third signal transmission end, a second power transmission end and a power receiving end, the second signal transmission end The transmission end is configured to contact the first signal transmission end of the temperature sensing device closest to the end face, and the second power transmission end is configured to contact the first power transmission end of the temperature sensing device closest to the end face terminal, the third signal transmission terminal is electrically connected to the second signal transmission terminal and configured to output the sensing results, and the power receiving terminal is electrically connected to the second power transmission terminal and configured to receive power supply. According to the ball screw described in claim 7, wherein the end cover further includes a transmission connection part, a fixing part and a cover part, the second signal transmission end and the second power transmission end are arranged on the transmission connection part, the fixing part is located between the cover part and the transmission connection part and connects the cover part and the transmission connection part, the fixing part is configured to limit the relative displacement between the end cover and the screw rod, and the cover part is configured to close the accommodating The channel, the third signal transmission end and the power receiving end are arranged on the cover. The ball screw according to claim 7 or 8, wherein the end cover further includes a management circuit, the management circuit is electrically connected to the second signal transmission end, the second power transmission end and the power receiving end, and the third signal The transmission end is set on the management circuit, and the management circuit is configured to receive power through the power receiving end, provide the power to each of the temperature sensing devices through the second power transmission end, and manage each of the temperature sensing devices through the second signal transmission end. The working schedule of the temperature sensing device is to collect the sensing results provided by the second signal transmission end, and output the collection result of these sensing results through the third signal transmission end. A thermal deformation suppression system configured to suppress thermal deformation of a ball screw, the ball screw includes a screw provided with a receiving channel, the thermal deformation suppression system includes a position controller, the position controller is based on an overall The displacement is compensated for the position of the screw, and the thermal deformation suppression system further includes: At least two temperature sensing devices as described in claim 1 are arranged in series in the accommodating channel; An end cover is arranged on the end face of the screw rod to close the accommodating channel, the end cover includes a second signal transmission end, a third signal transmission end, a second power transmission end and a power receiving end, the second signal transmission end The transmission end is configured to contact the first signal transmission end of the temperature sensing device closest to the end face, and the second power transmission end is configured to contact the first power transmission end of the temperature sensing device closest to the end face terminal, the third signal transmission terminal is electrically connected to the second signal transmission terminal and configured to output the sensing results, and the power receiving terminal is electrically connected to the second power transmission terminal and configured to receive power supply; A power supply device, configured at a position corresponding to the power receiving end, transmits power to the power receiving end by means of wireless induction or contact power supply; and A terminal processor, electrically connected with the power supply device and communicating with the third signal transmission terminal, the terminal processor is configured to control the operation of the power supply device, and receive the sensing results from the third signal transmission terminal , to estimate the total displacement of the screw.

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