Electric push rod driven by brushless motor

Abstract

The utility model relates to the field of electric push rods, in particular to an electric push rod driven by a brushless motor. The utility model provides an electric push rod driven by a brushless motor. The electric push rod comprises a brushless motor assembly, a driving tube assembly and a box body assembly, the brushless motor assembly is arranged in the box body assembly; a mounting frame for limiting a casing is arranged at the bottom end of the casing of the brushless motor assembly; the driving pipe assembly comprises a lead screw assembly, a special-shaped pipe, a front blank cap, a rear blank cap and a telescopic rod. The brushless motor assembly drives one end of the lead screw assembly to reciprocate, and one end of the lead screw assembly drives the telescopic rod to reciprocate. The brushless motor is adopted to drive the electric push rod, the rotating speed of the brushless motor is high, and the electric push rod can be driven more quickly; and the mounting frame arranged at the bottom end of the brushless motor assembly shell not only can limit the brushless motor in the axial direction, but also can adjust the circumferential size to adapt to brushless motors of different specifications, so that the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod field especially relates to a brushless motor drive's electric push rod. BACKGROUND

[0002] Electric push rod is a kind of electric power drive device that the rotary motion of motor is changed into the linear reciprocating motion of push rod. It can be used as execution machinery in various simple or complex process to realize remote control, centralized control or automatic control.

[0003] The existing electric push rod is mainly permanent magnet DC carbon brush motor, carbon brush motor is easily worn during use, after carbon brush motor wears, not only carbon brush needs to be replaced, but also the accessories such as gear wheel around motor needs to be replaced, and carbon brush motor wear will affect the use of electric push rod;In addition, the electric motor size difference of the existing electric push rod is large, different specifications of shell need to be set to adapt to various models of electric motor, and the manufacturing cost is high. UTILITY MODEL CONTENTS

[0004] The utility model aims at the deficiency in prior art, provide a kind of electric push rod that is not easy to wear and can adapt to each specification electric motor.

[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0006] Provide a kind of brushless motor drive's electric push rod, including: brushless motor assembly, drive pipe assembly and box body assembly;The brushless motor assembly is located in the box body assembly;

[0007] The bottom end of the shell of the brushless motor assembly is provided with the mounting bracket for limiting the shell;The drive pipe assembly includes: screw rod assembly, profiled pipe, front cover, rear cover and telescopic rod;The brushless motor assembly drives the reciprocating motion of one end of the screw rod assembly, and one end of the screw rod assembly drives the reciprocating motion of the telescopic rod.

[0008] Preferably, the shell is provided with a stator assembly and a rotor assembly;The rotor assembly is provided with an axially magnetized Hall disc, and the polarity of the Hall disc corresponds to the main magnetic pole of the rotor assembly one by one.

[0009] Preferably, the mounting bracket includes an axial limiting portion and a circumferential limiting portion, the axial limiting portion is connected to the bottom end of the shell, and the circumferential limiting portion is sleeved on the outer wall bottom end of the shell.

[0010] More preferably, the circumferential limiting portion includes a first half ring and a second half ring;Blind holes are formed in both ends of the first half ring, and block-shaped parts matching the blind holes are arranged at both ends of the second half ring;The block-shaped parts slide in the blind holes to change the size of the circumferential limiting portion.

[0011] More preferably, the box assembly is open at both ends, the bottom end of the rear cover is connected with the top end of the box assembly, and the top end of the axial limiting part is connected with the bottom end of the box assembly.

[0012] Preferably, the lead screw assembly is arranged in the profiled pipe; the lead screw assembly comprises a lead screw arranged in the axial direction of the profiled pipe, a nut, a front bearing, a worm gear and a rear bearing which are sequentially arranged outside the lead screw; and one end of the telescopic rod is fixedly connected with the nut.

[0013] Preferably, the bottom end of the front cover is connected with the top end of the rear cover to form a cover open at one end, and one end of the profiled pipe is fixedly connected with the open end of the cover.

[0014] Preferably, the box assembly further comprises a driving board, and the driving board comprises a power supply unit, a Hall detection unit, a motor MCU unit, a push rod stroke detection unit and a driving unit.

[0015] The power supply unit provides electric energy for the motor MCU unit, the Hall detection unit records the number of cycles of motor operation and feeds back to the motor MCU unit to calculate the number of revolutions of the motor; the push rod stroke detection unit is arranged at the highest / lowest position of the push rod, and the motor MCU unit sends a stop command after triggering the push rod stroke detection unit; the hand controller MCU unit receives user instructions and transmits them to the motor MCU unit, and the driving unit executes forward rotation, reverse rotation, speed regulation and other instructions according to the received instructions; the driving board is electrically connected with the brushless motor assembly and the hand controller respectively; and the hand controller and the driving board can realize position memory and multiple speed setting of the brushless motor assembly.

[0016] Compared with the prior art, the above technical scheme has the following technical effects:

[0017] 1. The electric push rod is driven by the brushless motor, and the brushless motor has high speed, so that the electric push rod can be driven faster.

[0018] 2. The mounting frame arranged at the bottom end of the brushless motor assembly shell can not only limit the brushless motor in the axial direction, but also adjust the circumferential size, so that brushless motors of different specifications can be adapted, and the production cost is reduced.

[0019] 3. The driving board is arranged in the box assembly, and through connection with the hand controller, the position memory function of the motor and the multiple speed setting of the motor can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a basic structure schematic view of an electric push rod in an embodiment of the utility model;

[0021] Figure 2 Part structure schematic view of electric push rod in one embodiment of the utility model;

[0022] Figure 3 Connection relation of each unit of driving plate in one embodiment of the utility model.

[0023] The reference signs in the drawings include:

[0024] Brushless motor assembly 1;Housing 11;Mounting bracket 12;Axial limiting portion 121;Circumferential limiting portion 122;Drive pipe assembly 2;Special-shaped pipe 21;Front cover 22;Rear cover 23;Telescopic rod 24;Box assembly 3. Specific implementation

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0027] The utility model will be further described below with reference to the drawings and specific embodiments, but not as the limitation of the utility model.

[0028] Embodiment

[0029] The embodiment provides a brushless motor driven electric push rod, which comprises a brushless motor assembly 1, a drive pipe assembly 2 and a box assembly 3;The brushless motor assembly 1 is arranged in the box assembly 3;

[0030] The bottom end of the brushless motor assembly 1 is provided with a mounting frame 12 limiting the shell 11; the mounting frame 12 comprises an axial limiting portion 121 and a circumferential limiting portion 122, the axial limiting portion 121 is connected with the bottom end of the shell 11, and the circumferential limiting portion 122 is sleeved on the bottom end of the outer wall of the shell 11; the circumferential limiting portion 122 comprises a first half ring and a second half ring; both ends of the first half ring are provided with blind holes, and both ends of the second half ring are provided with block-shaped parts matched with the blind holes; the block-shaped parts slide in the blind holes to change the size of the circumferential limiting portion 122, so as to adapt to brushless motor assemblies of different specifications; the shell 11 is provided with a stator assembly and a rotor assembly; the rotor assembly is provided with an axially magnetized Hall disc, the polarity of the Hall disc corresponds to the main magnetic pole of the rotor assembly one by one, and the main magnetic pole and the Hall disc keep a distance, so that the magnetic field of the Hall disc and the magnetic field of the main magnetic pole do not interfere with each other;

[0031] The driving pipe assembly 2 comprises a lead screw assembly, a special-shaped pipe 21, a front cover 22, a rear cover 23 and a telescopic rod 24; the lead screw assembly is arranged in the special-shaped pipe 21; the lead screw assembly comprises a lead screw arranged in the axial direction of the special-shaped pipe 21, a nut, a front bearing, a worm gear and a rear bearing which are sequentially sleeved outside the lead screw; one end of the telescopic rod 24 is fixedly connected with the nut; the lead screw assembly converts the rotary motion of the brushless motor assembly 1 into linear motion, so that the brushless motor assembly 1 can drive the lead screw assembly to perform reciprocating linear motion, and one end of the lead screw assembly drives the telescopic rod 24 to perform reciprocating linear motion; the bottom end of the front cover 22 is connected with the top end of the rear cover 23 to form a cover with one end open, and one end of the special-shaped pipe 21 is fixedly connected with the open end of the cover.

[0032] The box assembly 3 is open at both ends, the bottom end of the rear cover 23 is connected with the top end of the box assembly 3, and the top end of the axial limiting portion 121 is connected with the bottom end of the box assembly 3.

[0033] As a preferred embodiment, the box assembly 3 is further provided with a driving board, which comprises a power supply unit, a Hall detection unit, a motor MCU unit, a push rod stroke detection unit and a driving unit; the power supply unit is used to provide power for the motor MCU unit, the Hall detection unit records the number of cycles of the motor operation and feeds back to the motor MCU unit to calculate the number of turns of the motor. The push rod stroke detection unit is arranged at the highest / lowest position of the push rod, and the motor MCU sends a stop command after triggering the push rod stroke detection unit. The hand controller MCU unit is used to receive user instructions (such as up, down, memory position, speed adjustment, etc.) and transmit them to the motor MCU, and the driving unit (motor) executes the forward rotation, reverse rotation, speed adjustment and other instructions according to the received instructions. The driving board is electrically connected with the brushless motor assembly 1 and the hand controller respectively; the hand controller and the driving board can realize the position memory and multiple speed setting of the brushless motor assembly 1.

[0034] In summary, the utility model discloses a brushless motor drives electric push rod, and the brushless motor has high speed, and electric push rod can be driven faster, the mounting bracket of the bottom of brushless motor assembly machine shell can not only limit brushless motor in axial direction, but also can adjust the size of circumference, and is suitable for brushless motor of different specifications, and the production cost is reduced.

[0035] The above is only the preferred embodiment of the utility model, and does not limit the implementation and protection scope of the utility model, and for those skilled in the art, it should be realized that the scheme obtained by equivalent replacement and obvious change of the utility model specification and drawing content should be contained in the protection scope of the utility model.

Claims

1. An electric push rod driven by a brushless motor, characterized in that: Include: Brushless motor assembly (1), drive pipe assembly (2) and box assembly (3); the brushless motor assembly (1) is arranged in the box assembly (3); The bottom end of the shell (11) of the brushless motor assembly (1) is provided with a mounting bracket (12) for limiting the shell (11); the drive pipe assembly (2) comprises a lead screw assembly, a special-shaped pipe (21), a front cover (22), a rear cover (23) and a telescopic rod (24); The brushless motor assembly (1) drives one end of the lead screw assembly to reciprocate, and one end of the lead screw assembly drives the telescopic rod (24) to reciprocate.

2. The electric push rod according to claim 1, characterized in that The shell (11) is provided with a stator assembly and a rotor assembly; the rotor assembly is provided with an axially magnetized Hall disk, and the polarity of the Hall disk corresponds to the main magnetic pole of the rotor assembly one by one.

3. The motorized push rod of claim 1, wherein, The mounting bracket (12) comprises an axial limiting portion (121) and a circumferential limiting portion (122), the axial limiting portion (121) is connected with the bottom end of the shell (11), and the circumferential limiting portion (122) is sleeved on the outer wall bottom end of the shell (11).

4. The electric push rod according to claim 3, characterized in that The circumferential limiting portion (122) comprises a first half ring and a second half ring; the two ends of the first half ring are provided with blind holes, and the two ends of the second half ring are provided with block-shaped parts matched with the blind holes; the block-shaped parts slide in the blind holes to change the size of the circumferential limiting portion (122).

5. The motorized push rod of claim 3, wherein, The box assembly (3) is open at both ends, the bottom end of the rear cover (23) is connected with the top end of the box assembly (3), and the top end of the axial limiting portion (121) is connected with the bottom end of the box assembly (3).

6. The motorized push rod of claim 1, wherein, The lead screw assembly is arranged in the special-shaped pipe (21); the lead screw assembly comprises a lead screw arranged in the axial direction of the special-shaped pipe (21), a nut, a front bearing, a worm gear and a rear bearing which are sequentially sleeved outside the lead screw; the nut is fixedly connected with one end of the telescopic rod (24).

7. The motorized push rod of claim 1, wherein, The bottom end of the front cover (22) is connected with the top end of the rear cover (23) to form a cover open at one end, and one end of the special-shaped pipe (21) is fixedly connected with the open end of the cover.

8. The motorized push rod of claim 1, wherein, The box assembly (3) is further provided with a drive board, and the drive board comprises a power supply unit, a Hall detection unit, a motor MCU unit, a push rod stroke detection unit and a drive unit; The power supply unit provides power for the motor MCU unit, the Hall detection unit records the number of cycles of motor operation, and feeds back to the motor MCU unit to calculate the number of motor rotations; the push rod stroke detection unit is arranged at the highest / lowest position of the push rod, and after triggering the push rod stroke detection unit, the motor MCU unit sends a stop command; the hand controller MCU unit receives user instructions and transmits them to the motor MCU unit, and the drive unit executes forward rotation, reverse rotation, speed regulation and other instructions according to the received instructions; the drive board is electrically connected with the brushless motor assembly (1) and the hand controller respectively; the hand controller and the drive board can realize position memory and multiple speed setting of the brushless motor assembly (1).

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