An electronic limit device for a tubular motor

Abstract

The present invention provides an electronic limit device for a tubular motor, which relates to the technical field of motor control. It includes an internal gear ring connected to the motor output shaft through a connecting sleeve and an electronic limit part connected to the internal gear ring. The electronic limit part includes a housing, an absolute encoder, and a limit rotating shaft. Meshing teeth are arranged on the inner side of the internal gear ring, a first gear is arranged on the outer side of the limit rotating shaft, a through hole and a fixing seat are arranged on the housing. At least a part of the internal gear ring is located in the connecting sleeve, and a limit clamping post and a limit bolt hole for facilitating the passing of a limit bolt are arranged on the connecting sleeve. The electronic limit device for a tubular motor of the present invention has a simple structure and low production cost. It adopts electronic limit with high limit precision, and the transmission mechanism is arranged outside the tube, so the maintenance is simple. It is not necessary to manually rotate the plastic worm with an adjusting rod to set the two limits. The two pole limits can be directly set with the controller buttons or the handle buttons, and the electronic limit setting is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control,

[0002] and in particular, to an electronic limit device for a tubular motor. Background Art

[0003] Tubular motors are mostly used for electric rolling shutters. The motor is hidden inside the rolling tube. By rotating the motor, the transmission shaft is driven to rotate, so as to realize the lifting of the rolling shutter blades. When rising, the blades are wound around the reel. When descending, the blades slide down along the inner side of the guide rail. The rising, stopping, and descending actions of the curtain are realized through the control of a remote control.

[0004] When in use, the tubular motor is mostly installed inside a round tube. Since rolling shutters and windows both have two limit positions, namely the lowest position and the highest position, when setting the limit for the tubular motor, an adjusting rod is required to rotate a plastic worm to drive a lead screw to rotate, so as to trigger and set limit switches at the two limit positions. For example, the Chinese patent for utility model CN201893646U discloses a tubular motor limiter, which includes a base, a fixed seat, and a connecting seat. The fixed seat, the connecting seat, and the base are placed in sequence. The connecting seat is sleeved on the fixed seat, and the fixed seat and the base are fixedly connected. A column is vertically arranged on the fixed seat. A central transmission gear is arranged in the middle of the column, and a left-handed lead screw and a right-handed lead screw are arranged on both sides respectively. There is a gear at the lower part of the central transmission gear that meshes with the internal gear ring in the connecting seat. A left-handed nut and a right-handed nut are respectively arranged on the left-handed lead screw and the right-handed lead screw. Travel switches are arranged at the corresponding positions at the tops of the left-handed lead screw and the right-handed lead screw. For the above-mentioned tubular motor limiter of the utility model, the outer periphery of the connecting seat is connected to the electric drum. When the electric drum rotates, the connecting seat drives the central transmission gear, and then drives the left-handed nut and the right-handed nut to rotate. The left-handed lead screw and the right-handed lead screw move in opposite directions. When one of them triggers a travel switch, the electric drum stops running; the starting position is adjusted respectively with an adjusting rod, and the limiter can realize the automatic stop when the rolling shutter switch reaches the position.

[0005] However, the above-mentioned tubular motor limit structure still has the following problems: When installing and limiting the tubular motor inside the round tube in actual operation, the user needs to have a certain professional ability. Otherwise, it is difficult to perform correct measurements to ensure the installation and limit positions of the tubular motor and the round tube. Moreover, during the installation process, the round tube and the tubular motor are fixedly connected by screws, resulting in low limit accuracy, complex structure, cumbersome setting, and difficult maintenance.

[0006] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient electronic limit device for a tubular motor. Summary of the Invention

[0007] The object of the present invention is to provide a tubular motor electronic limit device with a simple structure, low production cost, high limit precision by using electronic limit, and the transmission mechanism is arranged outside the tube, which is simple to repair, does not require manual rotation of the plastic worm with an adjusting rod to set two limits, and can directly use the controller button or the handle button to set the two-pole limits, and the electronic limit is convenient to set.

[0008] To achieve the above object, the present invention is realized by the following technical solutions:

[0009] A tubular motor electronic limit device includes an internal gear ring connected to the motor output shaft through a connecting sleeve and an electronic limit part connected to the internal gear ring. The electronic limit part includes a housing, an absolute encoder arranged in the housing, and a limit rotating shaft connected to the absolute encoder. Meshing teeth are arranged on the inner side of the internal gear ring, and a first gear connected to the meshing teeth is arranged on the outer side of the limit rotating shaft. A through hole for the limit rotating shaft to pass through is arranged on the housing, and a fixed seat is arranged on one side of the housing away from the through hole. At least a part of the internal gear ring is located in the connecting sleeve, and a limit clamping column and a limit bolt hole for facilitating the passing of a limit bolt are arranged on the connecting sleeve.

[0010] As a preference of the present invention, a fifth gear is arranged on the limit rotating shaft, the absolute encoder is provided with an encoder shaft and a reduction rotating shaft, a second gear is arranged on the encoder shaft, and a third gear meshed with the second gear and a fourth gear meshed with the fifth gear are arranged on the reduction rotating shaft.

[0011] As a preference of the present invention, the outer diameter of the fifth gear is smaller than the outer diameter of the first gear, and the outer diameter of the third gear is smaller than the outer diameter of the fourth gear.

[0012] As a preference of the present invention, the outer diameter of the fourth gear is larger than the outer diameter of the fifth gear, and the outer diameter of the second gear is larger than the outer diameter of the third gear.

[0013] As a preference of the present invention, the number of the fourth gears is two, and the third gear is arranged between the two fourth gears.

[0014] As a preference of the present invention, a limit plate for restricting the position of the fourth gear is arranged on the limit rotating shaft.

[0015] As a preference of the present invention, a first fixing hole and a second fixing hole perpendicular to the first fixing hole are arranged on the fixed seat.

[0016] As a preference of the present invention, the first fixing hole and the second fixing hole are communicated.

[0017] Preferably, the number of the limiting clamping posts and the limiting bolt holes is at least one.

[0018] Preferably, the internal gear ring is an integrally formed part.

[0019] The beneficial effects of an electronic limiting device for a tubular motor according to the present invention are as follows: simple structure, low production cost, high limiting accuracy by adopting electronic limiting, and the transmission mechanism is arranged outside the tube, simple maintenance, no need to manually rotate the plastic worm with an adjusting rod to set two limits, and the two extreme limits can be directly set by the controller button or the handle button, and the electronic limiting is convenient to set. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic cross-sectional view of the overall structure of an embodiment of an electronic limiting device for a tubular motor according to the present invention;

[0021] Figure 2 is a schematic perspective view of the overall structure in an embodiment of an electronic limiting device for a tubular motor according to the present invention;

[0022] Figure 3 is a schematic perspective view of the connection structure between the limiting rotating shaft and the internal gear ring in an embodiment of an electronic limiting device for a tubular motor according to the present invention;

[0023] Figure 4 is a schematic perspective view of a partial structure of the electronic limiting part in an embodiment of an electronic limiting device for a tubular motor according to the present invention;

[0024] In the figure: 1, internal gear ring, 11, meshing teeth, 2, electronic limiting part, 21, housing, 22, absolute encoder, 221, encoder shaft, 222, reduction rotating shaft, 223, second gear, 224, third gear, 225, fourth gear, 23, limiting rotating shaft, 231, first gear, 232, fifth gear, 233, limiting plate, 24, fixed seat, 241, first fixing hole, 242, second fixing hole, 3, connecting sleeve, 31, limiting clamping post, 32, limiting bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0026] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements and steps of the modules and steps described in these embodiments do not limit the scope of the present invention.

[0027] Meanwhile, it should be understood that, for the sake of description convenience, the processes in the attached drawings do not merely proceed separately, but multiple steps are carried out cross - each - other.

[0028] The following description of at least one exemplary embodiment is actually merely illustrative and in no way restrictive of the present invention or its application or use.

[0029] Technologies, methods and systems known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and systems should be regarded as part of the authorization specification.

[0030] Embodiment 1: As Figures 1 to 4 shown, it is merely one of the embodiments of the present invention. A tubular motor electronic limit device includes an internal gear ring 1 connected to the motor output shaft through a connecting sleeve 3 and an electronic limit part 2 connected to the internal gear ring 1. The electronic limit part 2 includes a housing 21, an absolute encoder 22 arranged inside the housing 21, and a limit rotating shaft 23 connected to the absolute encoder 22. Meshing teeth 11 are arranged inside the internal gear ring 1, and a first gear 231 connected to the meshing teeth 11 is arranged outside the limit rotating shaft 23. A through - hole for the limit rotating shaft 23 to pass through is arranged on the housing 21, and a fixed seat 24 is arranged on one side of the housing 21 away from the through - hole. At least a part of the internal gear ring 1 is located inside the connecting sleeve 3, and a limit clamping post 31 and a limit bolt hole for facilitating the passing of a limit bolt 32 are arranged on the connecting sleeve 3.

[0031] In the present invention, output shafts are arranged at both ends of the motor. The output shaft at one end is used to drive the rolling shutter door to move up and down, and the output shaft at the other end is connected to the electronic limit part 2. The motor output shaft is connected to the internal gear ring 1 through the connecting sleeve 3, and the limit rotating shaft 23 of the electronic limit part 2 is meshingly connected to the internal gear ring 1. In this way, the encoder shaft 221 of the absolute encoder 22 in the electronic limit part 2 rotates along with the limit rotating shaft 23. When the encoder shaft 221 of the absolute encoder 22 rotates to a preset rotation value, the encoder shaft 221 of the absolute encoder 22 cannot continue to rotate, thereby restricting the continuous rotation of the motor output shaft and limiting the motor.

[0032] It should be noted that the tubular motor drives a rolling shutter door. The motor has an upper limit and a lower limit for position limitation. Only two values, namely the upper limit value and the lower limit value, need to be preset in the program of the absolute encoder 22. Then, the upper limit and the lower limit of the motor can be limited simultaneously. For example, two values are preset in the program of the absolute encoder 22 as 0 to 1000 respectively. When the motor controls the rolling shutter door to open, the output shaft of the motor rotates forward to drive the encoder shaft 221 to rotate until the value of the absolute encoder 22 reaches 1000. At this time, the rolling shutter door rises to the highest position, and the output shaft of the motor cannot rotate forward further, and the rolling shutter door cannot rise further. On the contrary, when the motor controls the rolling shutter door to close, the output shaft of the motor rotates reversely to drive the encoder shaft 221 to rotate until the value of the absolute encoder 22 reaches 0. At this time, the rolling shutter door drops to the lowest position, and the output shaft of the motor cannot rotate reversely further, and the rolling shutter door cannot drop further.

[0033] It should be noted that for the structure of the internal gear ring 1, at least a part of the internal gear ring 1 is located within the connecting sleeve 3. The connecting sleeve 3 is provided with a limit clamping post 31 and a limit bolt hole for facilitating the passing of the limit bolt 32. One end of the connecting sleeve 3 is sleeved outside the internal gear ring 1 and fixedly connected to the internal gear ring 1. The other end of the connecting sleeve 3 is connected to the transmission sleeve connected to the output shaft of the motor. Here, it is necessary that the output shaft of the motor, the transmission sleeve, the connecting sleeve, and the internal gear ring 1 rotate synchronously, so that the absolute encoder 22 can identify the rotation of the output shaft of the motor and limit the rotation of the output shaft of the motor.

[0034] Here, the number of the limit clamping posts 31 and the limit bolt holes is at least one. The connecting sleeve 3 is fixedly connected to the transmission sleeve through the limit clamping posts 31 and the limit bolts. The connecting sleeve 3 can also be connected to the internal gear ring 1 through another set of limit clamping posts 31 and limit bolts, so that the synchronous rotation of the output shaft of the motor and the internal gear ring 1 is more stable.

[0035] The main structure of the fixed limit is the electronic limit part 2. The electronic limit part 2 includes a housing 21, an absolute encoder 22 arranged inside the housing 21, and a limit rotating shaft 23 connected to the absolute encoder 22. A meshing tooth 11 is arranged inside the inner gear ring 1, and a first gear 231 connected to the meshing tooth 11 is arranged outside the limit rotating shaft 23. A perforation for the limit rotating shaft 23 to pass through is arranged on the housing 21. A fixed seat 24 is arranged on one side of the housing 21 away from the perforation. The housing 21 of the electronic limit part 2 is fixed on a fixed frame through the fixed seat 24. In this way, the electronic limit part 2 is fixed and does not rotate with the rotation of the motor output shaft. One end of the limit rotating shaft 23 is meshingly connected to the encoder shaft 221 of the absolute encoder 22, and the other end of the limit rotating shaft 23 extends out of the housing 21 to the inside of the inner gear ring 1 until the first gear 231 outside the limit rotating shaft 23 is meshingly connected to the meshing tooth 11 inside the inner gear ring 1. Only in this way can the rotation of the inner gear ring 1 be transmitted into the absolute encoder 22 for the identification of the limit signal.

[0036] Here, it is equivalent to arranging the electronic limit part 2 and the inner gear ring 1 outside the tube of the tubular motor, making the maintenance simpler.

[0037] In addition, the limit value of the absolute encoder 22 can be directly set by the controller button or the handle button, and two values can be set simultaneously. There is no need to manually rotate the plastic worm with an adjusting rod to set the two limit values. The limit setting is more convenient, and the limit accuracy of the absolute encoder 22 is high.

[0038] The structure of the electronic limit device of a tubular motor in the present invention is simple, the production cost is low, the electronic limit is adopted, the limit accuracy is high, and the transmission mechanism is arranged outside the tube, so the maintenance is simple. There is no need to manually rotate the plastic worm with an adjusting rod to set the two limits. The two limit positions can be directly set by the controller button or the handle button, and the electronic limit setting is convenient.

[0039] Embodiment 2, still as Figures 1 to 4 shown, which is only one embodiment of the present invention. On the basis of Embodiment 1, in the electronic limit device of a tubular motor in the present invention, a fifth gear 232 is arranged on the limit rotating shaft 23, a reduction rotating shaft 222 is arranged on the absolute encoder 22, a second gear 223 is arranged on the encoder shaft 221, and a third gear 224 meshingly connected to the second gear 223 and a fourth gear 225 meshingly connected to the fifth gear 232 are arranged on the reduction rotating shaft 222. The limit rotating shaft 23 is connected to the encoder shaft 221 of the absolute encoder 22 through the reduction rotating shaft 222, and the rotation speed of the motor output shaft is decelerated and transmitted to the absolute encoder 22, which is convenient for the absolute encoder 22 to set the limit.

[0040] Here, the outer diameter of the fifth gear 232 is smaller than that of the first gear 231, and the outer diameter of the third gear 224 is smaller than that of the fourth gear 225. Thus, when the rotational angular velocities of the first gear 231 and the fifth gear 232 are the same, the linear velocity of the fifth gear 232 during rotation is less than that of the first gear 231. Similarly, when the rotational angular velocities of the third gear 224 and the fourth gear 225 are the same, the linear velocity of the third gear 224 during rotation is less than that of the fourth gear 225, effectively reducing the rotational speed of the limit rotating shaft 23.

[0041] Furthermore, the outer diameter of the fourth gear 225 is larger than that of the fifth gear 232, and the outer diameter of the second gear 223 is larger than that of the third gear 224. When ensuring that the linear velocities of the meshing fourth gear 225 and fifth gear 232 are the same, the rotational angular velocity of the fourth gear 225 is less than that of the fifth gear 232; similarly, when ensuring that the linear velocities of the meshing second gear 223 and third gear 224 are the same, the rotational angular velocity of the second gear 223 is less than that of the third gear 224, further reducing the rotational speed of the limit rotating shaft 23.

[0042] In addition, the number of the fourth gears 225 is two, and the third gear 224 is disposed between the two fourth gears 225. At least a part of the second gear 223 extends between the two fourth gears 225 and the outer side of the second gear 223 meshes with the third gear 224, making the rotation of the deceleration rotating shaft 222 more stable.

[0043] Moreover, a limit plate 233 is provided on the limit rotating shaft 23. If the fourth gear 225 is exposed outside the absolute encoder 22, then one side of the limit plate 233 close to the absolute encoder 22 is connected to the side of the fourth gear 225 away from the absolute encoder 22, for restricting the position of the fourth gear 225; conversely, if the fourth gear 225 is not exposed outside the absolute encoder 22, then one side of the limit plate 233 close to the absolute encoder 22 is connected to the outer surface of the housing of the absolute encoder 22, for restricting the position of the absolute encoder 22, reducing the friction generated between the limit rotating shaft 23 and the absolute encoder 22 or the fourth gear 225 (the absolute encoder 22 does not rotate, and the rotational angular velocities of the fourth gear 225 and the limit rotating shaft 23 are different), and at the same time ensuring the stability of the rotation of the limit rotating shaft 23.

[0044] Similarly, a limit ring is provided at one end of the internal gear ring 1 close to the outer surface of the housing of the absolute encoder 22, reducing the friction generated between the rotating internal gear ring 1 and the non-rotating outer surface of the housing of the absolute encoder 22.

[0045] In addition, a first fixing hole 241 and a second fixing hole 242 perpendicular to the first fixing hole 241 are provided on the fixing base 24. Of course, the first fixing hole 241 and the second fixing hole 242 are communicated, which can better use fixing bolts to fix the fixing base 24, so that the entire electronic limiting part 2 will not rotate as a whole.

[0046] Finally, the internal gear ring 1 is an integrally formed part. The internal gear ring 1 will rotate at a high speed driven by the output shaft of the motor. In this way, the structural strength of the internal gear ring 1 is better and the overall service life is longer.

[0047] The structure of the electronic limiting device of the tubular motor of the present invention is simple, the production cost is low, the electronic limiting is adopted, the limiting accuracy is high, and the transmission mechanism is arranged outside the tube, so the maintenance is simple. There is no need to manually rotate the plastic worm with an adjusting rod to set the two limits. The two limit positions can be directly set with the controller buttons or the handle buttons, and the electronic limit setting is convenient.

[0048] The present invention is not limited to the above specific embodiments, and the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electronic limit device for a tubular motor, characterized in that: it includes an internal gear ring (1) connected to the motor output shaft through a connecting sleeve (3) and an electronic limit part (2) connected to the internal gear ring (1). The electronic limit part (2) includes a housing (21), an absolute encoder (22) arranged inside the housing (21), and a limit rotating shaft (23) connected to the absolute encoder (22). Meshing teeth (11) are arranged on the inner side of the internal gear ring (1), and a first gear (231) connected to the meshing teeth (11) is arranged on the outer side of the limit rotating shaft (23). A through hole for the limit rotating shaft (23) to pass through is arranged on the housing (21), and a fixing seat (24) is arranged on one side of the housing (21) away from the through hole. At least a part of the internal gear ring (1) is located inside the connecting sleeve (3), and a limit clamping column (31) and a limit bolt hole for facilitating the passing of a limit bolt (32) are arranged on the connecting sleeve (3); One end of the limit rotating shaft is meshed and connected to the encoder shaft of the absolute encoder, and the other end of the limit rotating shaft extends out of the housing to the inner side of the internal gear ring until the first gear on the outer side of the limit rotating shaft is meshed and connected to the meshing teeth on the inner side of the internal gear ring; and both the electronic limit part and the internal gear ring are arranged outside the tube of the tubular motor.

2. An electronic limit device for a tubular motor according to claim 1, characterized in that: a fifth gear (232) is arranged on the limit rotating shaft (23), the absolute encoder (22) is provided with an encoder shaft (221) and a reduction rotating shaft (222), a second gear (223) is arranged on the encoder shaft (221), and a third gear (224) meshed and connected to the second gear (223) and a fourth gear (225) meshed and connected to the fifth gear (232) are arranged on the reduction rotating shaft (222).

3. An electronic limit device for a tubular motor according to claim 2, characterized in that: the outer diameter of the fifth gear (232) is smaller than the outer diameter of the first gear (231), and the outer diameter of the third gear (224) is smaller than the outer diameter of the fourth gear (225).

4. An electronic limit device for a tubular motor according to claim 3, characterized in that: the outer diameter of the fourth gear (225) is larger than the outer diameter of the fifth gear (232), and the outer diameter of the second gear (223) is larger than the outer diameter of the third gear (224).

5. An electronic limit device for a tubular motor according to claim 2, characterized in that: the number of the fourth gears (225) is two, and the third gear (224) is arranged between the two fourth gears (225).

6. An electronic limit device for a tubular motor according to claim 2, characterized in that: a limit plate is arranged on the limit rotating shaft (23).

7. An electronic limit device for a tubular motor according to claim 1, characterized in that: a first fixing hole (241) and a second fixing hole (242) perpendicular to the first fixing hole (241) are arranged on the fixing seat (24).

8. An electronic limit device for a tubular motor according to claim 7, characterized in that: the first fixing hole (241) and the second fixing hole (242) are communicated.

9. An electronic limit device for a tubular motor according to claim 1, characterized in that: the number of the limit clamping posts (31) and the limit bolt holes is at least one.

10. An electronic limit device for a tubular motor according to claim 1, characterized in that: the internal gear ring (1) is an integrally formed part.

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