Linear push rod motor stroke detection device

Abstract

The utility model relates to a stroke detection device for a linear push rod motor. Comprising a rotor, a first gear ring arranged on the rotor, a shell rotating on the rotor, a planet carrier rotationally connected to the shell, a coding disc synchronously rotating with the planet carrier, a sensor for detecting the rotation angle of the coding disc, a planet wheel rotating on the planet carrier and a second gear ring arranged on the shell. The planet carrier is rotationally connected into the shell; one side of the planet wheel is meshed with the first gear ring; the other side of the planet gear is meshed with the second gear ring; the rotor is meshed with the threaded rod; and the rotor is rotationally connected to the shell. The problems that a stroke detection device arranged at the tail of a linear push rod motor cannot directly detect the stroke of a lead screw and lead screw stroke data can only be obtained through a structure and a software algorithm are solved.

Description

Technical Field

[0001] The utility model relates to the detection field, in particular to a linear push rod motor stroke detection device. Background Art

[0002] In the prior art, the conventional solution for linear actuator motors is that the motor rotor drives the lead screw nut to rotate together, and the lead screw cannot rotate due to structural constraints, resulting in axial movement of the lead screw. If a stroke detection device is set at the lead screw, it will lead to problems such as complex structure, too large structure, difficult wiring, and incomplete integration; thus, the stroke detection device can only be set at the drive control board at the tail of the linear actuator motor; setting a stroke detection device at the tail of the linear actuator motor cannot directly detect the lead screw stroke, and the lead screw stroke data can only be obtained through the structure and software algorithm. Utility Model Content

[0003] The embodiment of the present application provides a linear push rod motor stroke detection device, which solves the problem in the prior art that the stroke detection device set at the tail of the linear push rod motor cannot directly detect the screw rod stroke and can only obtain the screw rod stroke data through structure and software algorithm.

[0004] The technical solution adopted in the embodiments of the present application is as follows.

[0005] A linear actuator motor stroke detection device comprises a rotor, a first gear ring arranged on the rotor, a shell rotating on the rotor, a planetary carrier rotatably connected to the shell, an encoding disk rotating synchronously with the planetary carrier, a sensor detecting the rotation angle of the encoding disk, a planetary wheel rotating on the planetary carrier and a second gear ring arranged on the shell; the planetary carrier is rotatably connected in the shell; one side of the planetary wheel meshes with the first gear ring; the other side of the planetary wheel meshes with the second gear ring; the rotor meshes with a threaded rod; and the rotor is rotatably connected to the shell.

[0006] A further technical solution is that the planet carrier rotates on the housing via bearings.

[0007] A further technical solution is: the planetary gear includes two sets of gears, and the gear ratio of the two sets of gears is 10:1; the gear with a larger gear ratio meshes with the first gear ring, and the gear with a smaller gear ratio meshes with the second gear ring.

[0008] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0009] 1. A planet carrier is arranged in the shell, a code disk is fixedly connected to the planet carrier, a sensor is arranged in the shell, the sensor corresponds to the code disk, the sensor detects the rotation angle of the code disk, three sets of planetary gears are rotatably connected to the planet carrier, the planetary gears include two sets of gears, and the gear ratio of the two sets of gears is 10:1; the gear with a large gear ratio meshes with the first gear ring, and the gear with a small gear ratio meshes with the second gear ring. The first gear ring is arranged on the rotor, and the rotor is rotatably connected in the shell. The rotor rotates synchronously with the first gear ring, the first gear drives the planetary gear to rotate, and the second gear ring rotates in the shell. The second gear ring meshes with the planetary gear, thereby synchronously driving the code disk to rotate, and the rotor meshes with the threaded rod. When the shell is located as a whole, When the threaded rod moves, the rotor rotates, driving the first gear ring to rotate, and then driving the planetary gear to rotate. At this time, the planetary gear engages the second gear ring, and the rotation of the planetary gear drives the planetary carrier to rotate, so that the planetary carrier drives the encoder to rotate until the sensor measures the rotation angle of the encoder, thereby measuring the length of the threaded rod. This device can have a larger speed ratio in a smaller space; the sun gear is the input end, and the planetary carrier is the output end; the first gear ring at the input end is fixedly connected to the rotor, and its rotation speed, angle, and number of turns are the speed, angle, and number of turns of the motor rotor; the encoder disk is installed on the planetary carrier at the output end. When the input end gear rotates one circle, the planetary carrier and the encoder disk rotate a small angle n. This angle n represents the distance that the motor rotates one circle, and the motor rotates one circle, and the lead screw moves one lead distance. The sensor records the angle of rotation of the encoder disk to calculate the distance the lead screw moves, and can also calculate the speed of the lead screw according to the speed of the encoder disk. When the linear actuator motor completes the entire stroke, the encoder disk completes a rotation of one circle or less. In this way, each position point on the encoder disk corresponds to a stroke point of the lead screw, thereby realizing the rapid detection of the length of the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view of the linear push rod motor stroke detection device in the utility model.

[0011] In the figure: 1. rotor; 2. first ring gear; 3. housing; 4. planet carrier; 5. encoder disk; 6. sensor; 7. planetary gear; 8. second ring gear. DETAILED DESCRIPTION

[0012] The embodiment of the present application provides a linear push rod motor stroke detection device, which solves the problem in the prior art that the stroke detection device set at the tail of the linear push rod motor cannot directly detect the screw rod stroke and can only obtain the screw rod stroke data through structure and software algorithm.

[0013] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows

[0014] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0015] A linear push rod motor stroke detection device includes a rotor 1, a first gear ring 2 arranged on the rotor 1, a shell 3 rotating on the rotor 1, a planetary carrier 4 rotatably connected to the shell 3, an encoding disk 5 rotating synchronously with the planetary carrier 4, a sensor 6 for detecting the rotation angle of the encoding disk 5, a planetary wheel 7 rotating on the planetary carrier 4 and a second gear ring 8 arranged on the shell 3; the planetary carrier 4 is rotatably connected in the shell 3; one side of the planetary wheel 7 meshes with the first gear ring 2; the other side of the planetary wheel 7 meshes with the second gear ring 8; the rotor 1 meshes with a threaded rod; the rotor 1 is rotatably connected to the shell 3.

[0016] The planet carrier 4 rotates on the housing 3 via bearings.

[0017] The planetary gear 7 includes two sets of gears, and the gear ratio of the two sets of gears is 10:1; the gear with a larger gear ratio meshes with the first ring gear 2, and the gear with a smaller gear ratio meshes with the second ring gear 8.

[0018] A planet carrier 4 is provided in the housing 3, and an encoding disk 5 is fixedly connected to the planet carrier 4. A sensor 6 is provided in the housing 3, and the sensor 6 corresponds to the encoding disk 5. The sensor 6 detects the rotation angle of the encoding disk 5. Three sets of planetary gears 7 are rotatably connected to the planet carrier 4. The planetary gear 7 includes two sets of gears, and the gear ratio of the two sets of gears is 10:1; the gear with a large gear ratio meshes with the first gear ring 2, and the gear with a small gear ratio meshes with the second gear ring 8. The first gear ring 2 is provided on the rotor 1, and the rotor 1 is rotatably connected in the housing 3. The rotor 1 rotates synchronously with the first gear ring 2, and the first gear drives the planetary gear 7 to rotate. The second gear ring 8 rotates in the housing, and the second gear ring 8 meshes with the planetary gear 7, thereby synchronously driving the encoding disk 5 to rotate, and the rotor 1 meshes with the threaded rod. When When the housing 3 is located on the threaded rod as a whole and moves, the rotor 1 rotates, driving the first gear ring 2 to rotate, and then driving the planetary gear 7 to rotate. At this time, the planetary gear 7 engages the second gear ring 8, and the rotation of the planetary gear 7 drives the planetary carrier 4 to rotate, so that the planetary carrier 4 drives the encoder to rotate until the sensor 6 measures the rotation angle of the encoder; this device can have a larger speed ratio in a smaller space; the sun gear is the input end, and the planetary carrier 4 is the output end; the first gear ring 2 at the input end is fixedly connected to the rotor 1, and its rotation speed, angle, and number of turns are the speed, angle, and number of turns of the motor rotor 1; the encoder disk 5 is installed on the planetary carrier 4 at the output end, and the input end gear rotates one circle, and the planetary carrier 4 and the encoder disk 5 rotate a small angle n. This angle n represents that the motor rotates one circle, and the motor rotates one circle, and the lead screw moves a distance of one lead. The sensor 6 records the angle of rotation of the encoder disk 5 to calculate the distance the lead screw moves, and can also calculate the speed of the lead screw according to the speed of the encoder disk 5. When the linear actuator motor completes all strokes, the encoder disk 5 completes a circle or less than a circle of rotation. In this way, each position point on the encoding disk 5 corresponds to a travel point of the screw rod, thereby measuring the length of the screw rod.

[0019] Since a planet carrier 4 is arranged in the housing 3, an encoding disk 5 is fixedly connected to the planet carrier 4, a sensor 6 is arranged in the housing 3, the sensor 6 corresponds to the encoding disk 5, and the sensor 6 detects the rotation angle of the encoding disk 5. Three sets of planetary gears 7 are rotatably connected to the planet carrier 4, and the planetary gear 7 includes two sets of gears, and the gear ratio of the two sets of gears is 10:1; the gear with a large gear ratio meshes with the first gear ring 2, and the gear with a small gear ratio meshes with the second gear ring 8. The first gear ring 2 is arranged on the rotor 1, and the rotor 1 is rotatably connected in the housing 3. The rotor 1 rotates synchronously with the first gear ring 2, and the first gear drives the planetary gear 7 to rotate. The second gear ring 8 rotates in the housing, and the second gear ring 8 meshes with the planetary gear 7, thereby synchronously driving the encoding disk 5 to rotate, and the rotor 1 meshes with the threaded rod. When the housing 3 When the whole is located on the threaded rod and moves, the rotor 1 rotates, driving the first gear ring 2 to rotate, and then driving the planetary gear 7 to rotate. At this time, the planetary gear 7 engages the second gear ring 8, and the rotation of the planetary gear 7 drives the planetary carrier 4 to rotate, so that the planetary carrier 4 drives the encoder to rotate until the sensor 6 measures the rotation angle of the encoder, thereby measuring the length of the threaded rod; this device can have a larger speed ratio in a smaller space; the sun gear is the input end, and the planetary carrier 4 is the output end; the first gear ring 2 at the input end is fixedly connected to the rotor 1, and its rotation speed, angle, and number of turns are the speed, angle, and number of turns of the motor rotor 1; the encoder disk 5 is installed on the planetary carrier 4 at the output end, and the input end gear rotates one circle, and the planetary carrier 4 and the encoder disk 5 rotate a small angle n. This angle n represents the distance that the motor rotates one circle, and the motor rotates one circle, and the lead screw moves one lead distance. The sensor 6 records the angle of rotation of the encoder disk 5 to calculate the distance the lead screw moves, and the speed of the lead screw can also be calculated according to the speed of the encoder disk 5. When the linear actuator motor completes the entire stroke, the encoder disk 5 completes a circle or less than a circle of rotation. In this way, each position point on the encoding disk 5 corresponds to a travel point of the screw rod, thereby realizing rapid detection of the length of the screw rod.

[0020] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0021] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A linear actuator motor stroke detection device, characterized in that: The invention comprises a rotor (1), a first gear ring (2) arranged on the rotor (1), a housing (3) rotating on the rotor (1), a planetary carrier (4) rotatably connected to the housing (3), an encoding disk (5) rotating synchronously with the planetary carrier (4), a sensor (6) detecting the rotation angle of the encoding disk (5), a planetary wheel (7) rotating on the planetary carrier (4), and a second gear ring (8) arranged on the housing (3); the planetary carrier (4) is rotatably connected in the housing (3); one side of the planetary wheel (7) meshes with the first gear ring (2); the other side of the planetary wheel (7) meshes with the second gear ring (8); the rotor (1) meshes with a threaded rod; and the rotor (1) is rotatably connected to the housing (3).

2. The linear actuator motor stroke detection device according to claim 1, characterized in that: The planet carrier (4) rotates on the housing (3) via bearings.

3. The linear actuator motor stroke detection device according to claim 1, characterized in that: The planetary gear (7) comprises two sets of gears; a gear with a larger gear ratio meshes with the first gear ring (2), and a gear with a smaller gear ratio meshes with the second gear ring (8).

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