TWI708454B - Linear transmission device with capability of wireless power supply - Google Patents

Abstract

A linear transmission device with capability of wireless power supply includes a transmission mechanism and a wireless power supply module. The transmission mechanism includes a long shaft part and a moving part. The long shaft part defines an axis, and the moving part is movably disposed on the long shaft part along the axis. The wireless power supply module includes a magnet-providing part and an induction coil. The magnet-providing part is disposed on the long shaft part. The magnet-providing part is for providing a magnetic field, and a direction of the magnetic field is parallel to the axis. The induction coil is disposed on the moving part, and a normal vector of the induction coil is parallel to the direction of the magnetic field. When the moving part is moved along the axis, a current is induced in the induction coil through variation of the magnetic field.

Description

Linear actuator with wireless power supply function

The present invention relates to a linear transmission device, and in particular to a linear transmission device with wireless power supply function.

Linear transmission devices such as linear slides, ball screws, ball splines, etc. play a pivotal role in automation equipment. In order to improve the stability of automation equipment, linear actuators are currently developing towards the smart field. By installing sensors in the linear actuators, the parameters of the linear actuators can be collected and monitored, and corresponding processing can be made according to the parameters to avoid failures. . For example, the rigidity parameter can be monitored to grasp the wear condition of the component, and the component can be replaced before the component is damaged. For example, the vibration parameter can be monitored to grasp the operating speed of the component, so as to avoid excessively high operating speed causing jamming between components.

However, when it is necessary to install the sensor on the moving part of the linear actuator, if the sensor is powered by a wired method, for the complicated and densely wired automation equipment (such as injection molding machine), it is necessary to add other cables to the existing line. The wiring is extremely difficult in wiring. In addition, the moving part will pull the wire during the moving process, causing wire fatigue, disconnection or leakage, which is not conducive to the monitoring of the linear transmission device.

Chinese Patent Application Publication No. CN101326706A discloses a wireless actuator, which supplies power to a load (such as a driving part and a wireless receiving part) arranged on a movable platform through a non-contact power supply component. The non-contact power supply component includes a primary part arranged on a base part. The coil and the secondary coil set on the movable platform provide alternating current to the primary coil to make the primary coil generate a magnetic field direction perpendicular to the long direction of the track, and through the change of the magnetic field direction of the primary coil, the secondary coil generates an induced current. In this way, power can be supplied to the load installed on the movable station in a wireless manner, and the absence of the wire pulled by the movable station during the movement can be avoided. However, due to the arrangement of the primary coil and the secondary coil, the area where the primary coil is set needs to cover the travel distance of the movable platform in the long direction of the track (for example, multiple primary coils need to be arranged along the long direction of the track so that multiple primary The sum of the lengths of the coils in the long direction of the track is greater than or equal to the traveling distance of the mobile station in the long direction of the track; alternatively, a single, large-sized primary coil is arranged along the long direction of the track so that the length of the primary coil in the long direction of the track is greater than or equal to the moving distance The walking distance of the platform in the long direction of the track), when the movable platform is moved relative to the base, the secondary coil can be at least opposite to one primary coil. If the area where the primary coil is set is to be reduced, a secondary battery and secondary The coil is connected so that when the secondary coil is far away from the primary coil, power can be supplied to the secondary coil through the secondary battery. Therefore, the aforementioned wireless transmission requires a lot of materials, which virtually increases the production cost and manufacturing difficulty.

Chinese Patent Application Publication No. CN103659791A discloses a wireless power supply device and a direct drive system equipped with the device. Chinese Patent Publication No. CN102931735B discloses a non-contact power supply system and method for a mobile device running along a track. However, the Chinese Patent Application Publication The configuration of the primary coil and the secondary coil in CN103659791A and Chinese Patent Publication No. CN102931735B is similar to that of Chinese Patent Application Publication No. CN101326706A, so they also have higher production costs and manufacturing difficulties.

Therefore, how to develop a new linear actuator that can be installed in a wireless way The load of the moving part is supplied with power, which is conducive to the application in complex and densely wired automation equipment (such as injection molding machines), can avoid wire fatigue, disconnection or leakage caused by wired power supply, and at the same time help reduce production Cost and difficulty of production have become the goal of the relevant industry.

The object of the present invention is to provide a linear transmission device to solve the above-mentioned problems.

According to one embodiment of the present invention, a linear transmission device with a wireless power supply function is provided. The linear transmission device includes a transmission mechanism and a wireless power supply module. The transmission mechanism includes a long shaft part and a moving part, the long shaft part defines a long axis, and the moving part is arranged on the long shaft part in a manner capable of being displaced along the long axis. The wireless power supply module includes a magnetic supply unit and an induction coil. The magnetic supply part is arranged on the long axis part, and the magnetic supply part is used for providing a magnetic field, and a magnetic field direction of the magnetic field is parallel to the long axis. The induction coil is arranged on the moving part, and the normal vector of the induction coil is parallel to the direction of the magnetic field. When the moving part is displaced along the long axis, the induction coil induces a change in the magnetic field to generate an induced current.

The linear transmission device of the present invention, by providing a wireless power supply module, can use a wireless method to cause the induction coil set in the moving part to generate an induction current, and then can respond to loads electrically connected to the induction coil (such as parameter sensing modules). ) For power supply, which is beneficial to use in complex and densely wired automation equipment (such as injection molding machines), and can avoid wire fatigue, disconnection or leakage caused by wired power supply. In addition, in the linear transmission device of the present invention, regardless of whether an electric energy storage element is provided, the area where the magnetic supply part is provided does not need to cover the traveling distance of the moving part on the long axis part, which is beneficial to reduce production cost and manufacturing difficulty.

100, 300, 400: linear actuator

110, 310, 410: transmission mechanism

120, 320, 420: Long axis

121, 122, 321, 322, 421, 422: end

130, 330, 430, 530, 630: mobile part

131, 331, 332, 432, 531, 631: end face

133, 334, 533: groove

140, 240, 340: wireless power supply module

150, 250, 350, 450: Magnetic supply department

151, 351: Coil

152: Distance sensor

160, 260, 360, 560, 660: induction coil

190, 290: Load

270: Rectifier unit

280, 580, 680: electrical energy storage components

470: Support

533a: The first housing tank

533b: The second holding tank

590, 690: parameter sensing module

635: protrusion

635a: Top surface

635b: outer wall

700: machine

710: first link

720: second link

730: drive motor

740: Mould

A: Normal vector

B: Magnetic field direction

C: Arrow direction

D: long axis

L: distance

Fig. 1 is a perspective view of a linear transmission device according to an embodiment of the present invention.

Figure 2 is a functional block diagram of the wireless power supply module of Figure 1 for supplying power to a load.

FIG. 3 is a functional block diagram of a wireless power supply module for supplying power to a load according to another embodiment of the present invention.

Figure 4 is a perspective view of a linear transmission device according to another embodiment of the present invention.

Fig. 5 is a schematic plan view of a linear actuator according to another embodiment of the present invention.

Fig. 6 is a perspective schematic view of a moving part according to another embodiment of the present invention.

Figure 7 is a perspective schematic view of a moving part according to another embodiment of the present invention.

Fig. 8 is a schematic plan view of a machine according to another embodiment of the present invention.

Figure 9 is another schematic plan view of the machine in Figure 8.

Please refer to FIG. 1, which is a perspective view of a linear transmission device 100 according to an embodiment of the present invention. The linear transmission device 100 has a wireless power supply function. The linear transmission device 100 includes a transmission mechanism 110 and a wireless power supply module 140. The transmission mechanism 110 includes a long shaft portion 120 and a moving portion 130. The long shaft portion 120 defines a long axis D. The moving portion 130 is disposed on the long shaft portion 120 in a manner capable of being displaced along the long axis D. In this embodiment, the long shaft portion 120 is a screw, and the moving portion 130 is a nut. Rolling elements (not shown) such as balls or rollers can be arranged between the screw and the nut, that is, the transmission mechanism 110 can be It is a ball screw or roller screw. In other embodiments, the transmission mechanism 110 may be, but is not limited to, a linear slide or a ball spline. For example, when the transmission mechanism 110 is a linear slide, the long shaft portion 120 may be a slide. The rail and the moving part 130 may be a slider. When the transmission mechanism 110 is a ball spline, the long shaft part 120 may be a spline shaft, and the moving part 130 may be a spline nut.

The wireless power supply module 140 includes a magnetic supply unit 150 and an induction coil 160. The magnetic supply part 150 is arranged at The long axis portion 120 and the magnetic supply portion 150 are used to provide a magnetic field, and the magnetic field direction B of the magnetic field is parallel to the long axis D. In detail, the magnetic supply unit 150 includes a coil 151 which is arranged parallel to the induction coil 160 and can be connected to a power supply (not shown) through a wire (not shown) to supply power to the coil 151 so that the coil 151 generates a magnetic field. When a clockwise current is supplied to the coil 151, as shown by the arrow direction C, at this time, the side of the magnetic supply part 150 facing the moving part 130 is the N pole, and the side far away from the moving part 130 is the S pole, that is, the magnetic supply The direction B of the magnetic field of the portion 150 is toward the moving portion 130 and is parallel to the long axis D. When a counterclockwise current is supplied to the coil 151 (opposite to the arrow direction C), the side of the magnetic supply part 150 facing the moving part 130 is the S pole, and the side far away from the moving part 130 is the N pole, that is, the magnetic supply part 150 The magnetic field direction B is away from the moving part 130 and parallel to the long axis D. In other embodiments, the magnetic supply part may be a permanent magnet, and the direction of the magnetic field of the permanent magnet is toward the moving part or away from the moving part and parallel to the long axis.

The induction coil 160 is disposed on the moving part 130, and the normal vector A of the induction coil 160 is parallel to the direction B of the magnetic field. When the moving part 130 is displaced along the long axis D, the induction coil 160 induces a change in the magnetic field to generate an induced current. In this embodiment, the coil 151 of the magnetic supply unit 150 is arranged in parallel with the induction coil 160, thereby helping to increase the magnetic flux passing through the induction coil 160, thereby increasing the efficiency of generating induced current.

The aforementioned change in the magnetic field can be achieved by making the induction coil 160 and the magnetic supply unit 150 move relative to each other to change the magnetic flux through the induction coil 160. When the magnetic supply unit 150 includes the coil 151, the aforementioned change in the magnetic field can also be achieved through The coil 151 of the part 150 provides alternating current, and the direction B of the magnetic field provided by the magnetic supply part 150 is changed. In addition, the wire diameter, coil diameter, and number of turns of the induction coil 160 can be adjusted according to actual needs to increase the intensity of the induced current generated.

In Fig. 1, the magnetic supply part 150 is provided at the end 121 of the long shaft part 120, thereby avoiding the influence on the original stroke of the moving part 130.

In Figure 1, the moving part 130 includes an end surface 131 and a groove 133. The groove 133 is recessed from the end surface 131, and the induction coil 160 is disposed in the groove 133, so that the original size of the moving part 130 can be maintained and avoiding interference with the moving part. 130's original itinerary was affected.

In Figure 1, the wireless power supply module 140 can optionally include a distance sensor 152, which is arranged on the side of the magnetic supply part 150 facing the moving part 130. In order to show the position of the distance sensor 152, it is drawn with a dotted line. Distance sensor 152. The distance sensor 152 is used to sense the distance L between the magnetic supply unit 150 and the induction coil 160. When the distance L between the magnetic supply unit 150 and the induction coil 160 is a predetermined distance, the coil 151 of the magnetic supply unit 150 Energize to provide a magnetic field. In this way, the magnetic supply part 150 can be supplied with power only within a certain distance range, which is beneficial to save electric energy and heat energy. The predetermined distance may be greater than 0 cm and less than or equal to 30 cm. The range sensor 152 that can be used includes, but is not limited to, an optical sensor (such as a laser radar) or an ultrasonic sensor.

Please refer to FIG. 2, which is a functional block diagram of the wireless power supply module 140 in FIG. 1 for supplying power to a load 190. In detail, the induction coil 160 can be electrically connected to the load 190, so that the induction current generated by the induction coil 160 can directly supply power to the load 190.

Please refer to FIG. 3, which is a functional block diagram of a wireless power supply module 240 powering a load 290 according to another embodiment of the present invention. The wireless power supply module 240 includes a magnetic supply part 250, an induction coil 260, a rectification unit 270, and an electric energy storage element 280. The rectification unit 270 is disposed between the induction coil 260 and the electric energy storage element 280 to transfer the induced current from Alternating current is transformed into direct current. The electric energy storage element 280 is arranged in the moving part and is electrically connected to the induction coil 260 through the rectifying unit 270. The electric energy storage element 280 can be detachably arranged in the moving part, thereby facilitating the replacement of the electric energy storage element 280. The storage element 280 can be, but is not limited to, a capacitor or a rechargeable battery, and the rechargeable battery can be, but is not limited to For button-type rechargeable batteries or flexible lithium batteries. The electrical energy storage element 280 is electrically connected to the load 290. The induced current generated by the induction coil 260 can be stored in the electrical energy storage element 280, and then the electrical energy storage element 280 supplies power to the load 290, thereby facilitating continuous power supply to the load 290, for example When the magnetic supply part 250 is energized only when the distance between the magnetic supply part 250 and the induction coil 260 is a predetermined distance, the load 290 can be continuously powered through the electric energy storage element 280 beyond the predetermined distance.

The other details of the wireless power supply module 240 can be the same as the wireless power supply module 140 without any contradiction, and will not be repeated here.

Please refer to FIG. 4, which is a perspective view of a linear transmission device 300 according to another embodiment of the present invention. The linear transmission device 300 includes a transmission mechanism 310 and a wireless power supply module 340. The transmission mechanism 310 includes a long axis part 320 and a moving part 330, and the wireless power supply module 340 includes two magnetic supply parts 350 and two induction coils 360. The two magnetic supply parts 350 are respectively disposed at the two end parts 321 and 322 of the long shaft part 320. Each magnetic supply part 350 includes a coil 351. The moving part 330 includes two end faces 331 and 332 and two grooves. One groove ( (Not shown) is recessed from the end surface 331, and another recess 334 is recessed from the end surface 332. The two induction coils 360 are respectively disposed in the recess at the end surface 331 and the recess 334 at the end surface 332. The coil 351 is configured to interact with the induction coil. 360 is parallel, and can be connected to a power supply (not shown) through a wire (not shown) to supply power to the coil 351, so that the coil 351 generates a magnetic field.

In Figure 4, the two induction coils 360 can be electrically connected to the same load (not shown), whereby the induced current generated by the two induction coils 360 can supply power to the same load. Alternatively, the two induction coils 360 may be electrically connected to two loads (not shown), respectively, and the induced currents generated by the two induction coils 360 respectively supply power to the two loads. When the two induction coils 360 are electrically connected to the same load, the two induction coils 360 can be connected in series or in parallel. Regarding how to configure the magnetic field direction of the two magnetic supply parts 350 to correspond to the connection mode of the two induction coils 360 (Series or parallel) is well known in the art, and will not be repeated here.

The other details of the linear transmission device 300 can be the same as those of the linear transmission device 100 without any contradiction, which will not be repeated here.

Please refer to FIG. 5, which is a schematic plan view of a linear transmission device 400 according to another embodiment of the present invention. The linear transmission device 400 includes a transmission mechanism 410 and a wireless power supply module (not marked separately). The transmission mechanism 410 includes a long shaft portion 420 and a moving portion 430. The long shaft portion 420 includes end portions 421 and 422. The moving portion 430 includes an end surface 432 and a groove (not shown). The groove is recessed from the end surface 432. The power supply module includes a magnetic supply part 450 and an induction coil (not shown), and the induction coil is disposed in a groove on the end surface 432. The magnetic supply part 450 is arranged at the end 422 of the long shaft part 420. The wireless power supply module may further include a support part 470 for supporting the magnetic supply part 450. The magnetic supply part 450 can be glued or screwed It is fixed to the supporting part 470 in a similar manner. The supporting part 470 is arranged at the end 422 and connected to the machine (not shown). By using the supporting part 470 of different thickness, the distance between the magnetic supply part 450 and the induction coil can be adjusted , And then adjust the magnitude of the induced current.

With reference to FIG. 6, it is a perspective view of the moving part 530 according to another embodiment of the present invention. The linear transmission device may include a parameter sensing module 590 which is electrically connected to the induction coil 560, that is, the parameter sensing module 590 is a load connected to the induction coil 560. The parameter sensing module 590 is used to sense a parameter of the linear transmission device. For example, the parameter sensing module 590 can sense the running speed of the long shaft of the linear transmission device, which can avoid damage to other components due to excessive running speed. When the long axis is stuck, the parameters sensed by the parameter sensing module 590 can be wirelessly transmitted to a receiving unit (not shown), such as a computer, a smart phone, etc., so that the linear transmission device can be monitored in real time. The parameter sensing module 590 that can be used includes but is not limited to sensing parameters such as vibration, temperature, or sound signals Device.

In Figure 6, the wireless power supply module may include an electric energy storage element 580, which is electrically connected to the induction coil 560, and a rectifier unit (not shown) can be installed between the electric energy storage element 580 and the induction coil 560. The induced current generated by the induction coil 560 is first stored in the electric energy storage element 580, and then the electric energy storage element 580 supplies power to the parameter sensing module 590. In other words, the parameter sensing module 590 is electrically connected to the electric energy storage element 580 and the induction coil 560. Sexual connection.

The moving part 530 includes an end surface 531 and a groove 533. The groove 533 is recessed from the end surface 531. The groove 533 includes a first accommodating groove 533a and a second accommodating groove 533b. The induction coil 560 is disposed in the first accommodating groove 533a. The electric energy storage element 580 and the parameter sensing module 590 are disposed in the second accommodating groove 533 b, thereby helping to maintain the original size of the moving part 530.

With reference to FIG. 7, it is a perspective view of the moving part 630 according to another embodiment of the present invention. Compared with Figure 6, the moving part 630 includes an end surface 631 and a protrusion 635. The protrusion 635 protrudes from the end surface 631. The protrusion 635 includes two surfaces, a top surface 635a and an outer wall surface 635b, and the outer wall surface 635b is connected to the top surface 635a. With the end surface 631, the induction coil 660 is disposed on the top surface 635a, and the electric energy storage element 680 and the parameter sensing module 690 are disposed on the outer wall surface 635b, thereby facilitating maintaining the radial size of the moving part 630. In other embodiments, the induction coil 660 can also be disposed on the outer wall surface 635 b, and the electric energy storage element 680 and the parameter sensing module 690 are disposed on the induction coil 660. Regarding the electrical energy storage element 680 and the parameter sensing module 690, please refer to the relevant descriptions of the electrical energy storage element 280, the electrical energy storage element 580 and the parameter sensing module 590, which will not be repeated here.

With reference to Figure 8 and Figure 9, Figure 8 is a machine according to another embodiment of the present invention 700 is a schematic plan view. Figure 9 is another plan view of the machine 700 in Figure 8. In Figures 8 and 9, the machine 700 is an injection molding machine. In Figure 8, the machine 700 is in a closed mold. In the stage, in Figure 9, the machine 700 is in the mold-opening and ejection stage. The linear transmission device 100 is disposed on the machine table 700, and the machine table 700 has a fixed working stroke. Here, the machine 700 is an injection molding machine only for example, and the present invention is not limited to this. Any machine 700 with a fixed working stroke is suitable for installing the linear transmission device 100. For example, the machine 700 can also be a die-casting machine. Machine or pipe bending machine.

With reference to Figure 1, the linear actuator 100 is connected to the drive motor 730 of the machine 700 by the end 122, and is connected to the first link 710 of the machine 700 by the moving part 130, and the drive motor 730 drives the long shaft portion 120. The rotation then drives the moving part 130 to move along the long axis D, and then drives the first connecting rod 710 and the second connecting rod 720 to move, so that the mold 740 is recombined and opened. By arranging the wireless power supply module 140 in the transmission mechanism 110, the existing fixed stroke of the machine 700 can be used to make the magnetic supply part 150 and the inductive coil 160 move relative to each other so that the inductive coil 160 generates an induced current without additional installation. The power source makes the magnetic supply part 150 and the inductive coil 160 move relative to each other, which is beneficial to provide wireless power supply function under the premise of saving energy and simplifying components. In addition, for the machine 700 with complex and dense wiring, it is necessary to use a wired method to supply power to the load installed in the moving part 130. There is great difficulty in wiring. The present invention can make the induction installed in the moving part 130 wirelessly The coil 160 generates an induced current, which can also solve the problem of difficult wiring in a wired manner.

In the present invention, two elements are parallel or perpendicular, which means that one element is to be arranged parallel or perpendicular to another element. However, in practice, due to manufacturing tolerances or other factors, the element and the other element may not be completely Parallel or perpendicular, therefore, in the present invention, the parallel or perpendicular between two elements covers the situation of being substantially parallel or substantially perpendicular. For example, the deviation within plus or minus 10 degrees between the two elements belongs to the protection category of the present invention.

In the present invention, the electrical connection refers to the direct, indirect, wired or wireless transmission of electrical energy between components.

Compared with the prior art, the linear actuator of the present invention, by providing a wireless power supply module, can use a wireless method to cause the induction coil arranged in the moving part to generate an induction current, and then can respond to the load electrically connected to the induction coil ( Such as parameter sensing module) for power supply, which is beneficial to the application in complex and dense automation equipment (such as injection molding machine), and can avoid wire fatigue, disconnection or leakage caused by wired power supply, which is beneficial to Intelligent development of linear actuators. In addition, in the linear transmission device of the present invention, regardless of whether an electric energy storage element is provided, the area where the magnetic supply part is provided does not need to cover the traveling distance of the moving part on the long axis part, which is beneficial to reduce production cost and manufacturing difficulty.

The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

100: Linear actuator

110: Transmission mechanism

120: Long axis

121, 122: end

130: Mobile Department

131: end face

133: Groove

140: wireless power supply module

150: Magnetic Supply Department

151: Coil

152: Distance sensor

160: induction coil

A: Normal vector

B: Magnetic field direction

C: Arrow direction

D: long axis

L: distance

Claims (9)

A linear transmission device with a wireless power supply function, comprising: a transmission mechanism, including: a long axis portion defining a long axis; and a moving portion disposed on the long axis portion in a manner capable of being displaced along the long axis; and A wireless power supply module includes: a magnetic supply part arranged on the long axis part, the magnetic supply part is used to provide a magnetic field, a magnetic field direction of the magnetic field is parallel to the long axis; and an induction coil arranged on the The moving part, a normal vector of the induction coil is parallel to the direction of the magnetic field; wherein the moving part includes an end surface and a groove, the groove is recessed from the end surface, and the induction coil is arranged in the groove; wherein when the movement The part is displaced along the long axis, and the induction coil induces the change of the magnetic field to generate an induced current. The linear transmission device according to claim 1, wherein the magnetic supply part is provided at one end of the long shaft part. The linear transmission device according to claim 1, wherein the moving part is a nut, and the long shaft part is a screw. The linear transmission device according to claim 1, wherein the linear transmission device is arranged on a machine platform with a fixed working stroke. The linear transmission device according to claim 1, wherein the wireless power supply module further comprises: an electric energy storage element disposed on the moving part and electrically connected to the induction coil. The linear transmission device according to claim 5, wherein the electric energy storage element is detachably arranged on the moving part. The linear transmission device according to claim 1, wherein the magnetic supply part includes a coil, and the wireless power supply module further includes a distance sensor for sensing the difference between the magnetic supply part and the induction coil When the distance between the magnetic supply portion and the induction coil is a predetermined distance, the coil of the magnetic supply portion is energized to provide the magnetic field, and the predetermined distance is greater than 0 cm and less than or equal to 30 cm . The linear transmission device according to claim 1, further comprising a parameter sensing module, the parameter sensing module is electrically connected to the induction coil, and the parameter sensing module is used to sense one of the linear transmission devices parameter. A linear transmission device with a wireless power supply function, comprising: a transmission mechanism, including: a long axis portion defining a long axis; and a moving portion disposed on the long axis portion in a manner capable of being displaced along the long axis; and A wireless power supply module includes: a magnetic supply part arranged on the long axis part, the magnetic supply part is used to provide a magnetic field, a magnetic field direction of the magnetic field is parallel to the long axis; and an induction coil arranged on the Moving part, a normal vector of the induction coil is flat with the direction of the magnetic field Line; wherein the moving portion includes an end surface and a protrusion, the protrusion protruding from the end surface, the induction coil is disposed on a surface of the protrusion; wherein when the moving portion is displaced along the long axis, the induction coil induces the The change of the magnetic field produces an induced current.

Images