Electric push rod

Abstract

The utility model provides an electric push rod which comprises a sleeve I, a sleeve II, a self-locking assembly, a motor, an execution assembly and a telescopic pipe, the self-locking assembly is arranged at one end of a motor shaft, when the electric push rod does not work, the motor shaft can be locked and cannot rotate, the situation that the motor is driven to rotate after the push rod is affected by external force and moves is effectively avoided, and the service life is prolonged; the execution assembly comprises a magnet and a PCB (Printed Circuit Board), and a Hall piece on the PCB induces with the magnet so as to control the stroke of the electric push rod in a contactless manner; the magnet is installed on the driving nut, the distance between the magnet and the Hall piece can be accurately controlled, debugging is convenient, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric drive technology field, specifically is a kind of 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. Since motor and push rod are interlocked, when motor stops working, push rod will drive motor to rotate after being affected by external force, which will cause damage to motor and product failure, and reduce the service life of electric push rod. SUMMARY

[0003] In view of the defects of existing electric push rod, the technical problem to be solved by the utility model is to provide an electric push rod with self-locking function, stroke control and convenient debugging under high-speed operation. The motor shaft can be locked when the electric push rod is not working, which effectively avoids the rotation of motor caused by the movement of push rod affected by external force and the resulting product failure, and prolongs the service life.

[0004] In order to achieve the above purpose, according to one aspect of the utility model, the utility model is realized by the following technical measures: an electric push rod, comprising sleeve I, sleeve II, self-locking assembly, motor, execution assembly and telescopic tube, the sleeve I and the sleeve II are butted to each other, the motor is arranged in the sleeve I, the motor shaft of the motor extends out of the motor from both ends of the motor, the self-locking assembly and the execution assembly are respectively arranged at both ends of the motor shaft, the self-locking assembly automatically locks the motor when the electric push rod stops working, the other end of the execution assembly is connected with the telescopic tube, the execution assembly comprises bearing seat, screw rod, extension tube and drive nut, the bearing seat is fixed at the end of the motor, the screw rod is arranged in the bearing seat, one end of the screw rod is connected with the motor shaft, the other end is connected with the drive nut, the drive nut is fixed at the end of the extension tube, the motor can drive the screw rod to rotate when the motor rotates, and the extension tube moves linearly.

[0005] Further, the motor shaft is provided with a protrusion near one end of the self-locking assembly, the self-locking assembly comprises coil shell, friction plate, armature and connecting block, the connecting block fixes the coil shell and the motor together, the friction plate and the armature are clamped between the connecting block and the coil shell, the armature is provided with a center hole corresponding to the protrusion in the center, the coil shell is provided with coil column inside, the coil column is provided with coil outside, the coil shell is provided with a plurality of spring holes at the end, and the spring holes are provided with springs, when the springs are in natural state, one end of the spring extends out of the spring hole and abuts against the friction plate.

[0006] Further, the protrusion is a polygon.

[0007] Further, the execution assembly further comprises a magnet, a PCB (Printed Circuit Board), and a fixing seat, the outer wall of the drive nut is provided with a mounting seat, the mounting seat is provided with the magnet, the outer side of the magnet is provided with the PCB, the PCB is fixed in the sleeve II through the bearing seat and the fixing seat, and a plurality of Hall pieces are arranged on the PCB.

[0008] Compared with the prior art, the electric push rod has the advantages that: the self-locking assembly is arranged at one end of the motor shaft, the motor shaft is locked to be unable to rotate when the electric push rod is not working, movement of the push rod caused by external force is effectively avoided, the motor is prevented from rotating, product failure is avoided, and the service life is prolonged; the execution assembly comprises a magnet and a PCB, the Hall pieces on the PCB and the magnet can inductively control the stroke of the electric push rod without contact; the magnet is arranged on the drive nut to accurately control the distance between the magnet and the Hall pieces, and debugging is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0009] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the illustrative embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application. In the drawings:

[0010] Figure 1 It is an explosion structure schematic view of the electric push rod.

[0011] Figure 2 It is a cross-sectional view of the electric push rod.

[0012] Figure 3 It is an explosion structure schematic view of the self-locking assembly.

[0013] Figure 4 It is a structure schematic view of the coil shell.

[0014] Figure 5 It is a structure schematic view of the execution assembly.

[0015] The reference signs are explained as follows: 1, sleeve I; 2, sleeve II; 3, self-locking assembly; 4, motor; 5, execution assembly; 6, telescopic tube; 7, protruding block; 8, coil shell; 9, friction plate; 10, armature; 11, connecting block; 12, center hole; 13, coil column; 14, coil; 15, spring hole; 16, bearing seat; 17, screw rod; 18, extending tube; 19, drive nut; 20, mounting seat; 21, magnet; 22, fixing seat; 23, PCB; 24, Hall piece. DETAILED DESCRIPTION

[0016] Hereinafter, the utility model will be described in detail with reference to the drawings and in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0017] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "bottom", "top" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0018] Please refer to Figures 1-5 The utility model provides a kind of electric push rod, including sleeve I1, sleeve II 2, self-locking component 3, motor 4, execution component 5, telescopic tube 6, sleeve I1 and sleeve II 2 are mutually butted, motor 4 is located in sleeve I1, self-locking component 3 and execution component 5 are respectively arranged at motor shaft both ends, motor shaft extends from motor 4 both ends motor 4, motor shaft is close to the end of self-locking component 3 and is equipped with lug 7, lug 7 is polygonal;Self-locking component 3 includes coil shell 8, friction plate 9, armature 10, connecting block 11, connecting block 11 is fixed together with coil shell 8 and motor 4, connecting block 11 and coil shell 8 are clamped with friction plate 9 and armature 10, armature 10 center is equipped with the polygonal center hole 12 corresponding with lug 7, coil column 13 is equipped in coil shell 8, coil 14 is equipped outside coil column 13, spring hole 15 is equipped at the end of coil shell 8, spring is equipped in spring hole 15, when spring is in natural state, one end of spring extends spring hole 15 and is in abutment with friction plate 9;Execution component 5 other end is connected with telescopic tube 6, execution component 5 includes bearing seat 16, screw rod 17, extension tube 18, drive nut 19, magnet 21, PCB board 23, fixed seat 22, bearing seat 16 is fixed at the end of motor 4, bearing seat 16 is equipped with screw rod 17, screw rod 17 one end is connected with motor shaft, motor 4 can drive screw rod 17 to rotate when rotating, screw rod 17 other end is connected with drive nut 19 by screw thread, drive nut 19 is fixed at the end of extension tube 18, drive nut 19 outer wall is equipped with mounting seat 20, mounting seat 20 is equipped with magnet 21, magnet 21 outside is equipped with PCB board 23, PCB board 23 is equipped with Hall piece 24 on, Hall piece 24 at least two, the interval of two Hall pieces 24 fixes the stroke of electric push rod, PCB board 23 is fixed in sleeve II 2 by bearing seat 16 and fixed seat 22.

[0019] The electric push rod provided by the embodiment works as follows: when the coil 14 is powered, the electromagnetic field generated by the coil 14 makes the spring in a compressed state and accommodated in the spring hole 15, the friction plate 9 and the armature 10 are in a free state, the protrusion 7 on the motor shaft does not contact the armature 10, the motor 4 drives the screw rod 17 to rotate, and the control extension pipe 18 moves linearly; when the driving nut 19 moves to the position of the Hall element 24 on the PCB 23, the magnet 21 on the driving nut 19 and the Hall element 24 on the PCB 23 are inducted, and the PCB 23 controls the motor 4 to stop rotating; when the electric push rod stops working, the coil 14 is powered off, the electromagnetic field generated by the coil 14 disappears, the spring is elongated, the friction plate 9 abuts against the spring hole 15 after the spring end extends out, the friction plate 9 moves outward against the armature 10, the armature 10 is sleeved on the protrusion 7 of the motor shaft and is limited to rotate, and then the motor 4 is locked to prevent the motor 4 from idling when the electric push rod is powered off.

[0020] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. The present application can be changed and varied in various ways by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric linear actuator, comprising a sleeve I, a sleeve II, a motor, an actuator assembly, and a telescopic tube, wherein sleeve I and sleeve II are connected to each other, the motor is disposed inside sleeve I, and the motor shaft extends from both ends of the motor, characterized in that: It also includes a self-locking component. The self-locking component and the actuation component are respectively located at both ends of the motor shaft. The self-locking component automatically locks the motor when the electric push rod stops working. The other end of the actuation component is connected to the telescopic tube. The actuation component includes a bearing seat, a lead screw, an extension tube, and a drive nut. The bearing seat is fixed at the end of the motor. The lead screw is installed inside the bearing seat. One end of the lead screw is connected to the motor shaft, and the other end is connected to the drive nut. The drive nut is fixed at the end of the extension tube. When the motor rotates, it can drive the lead screw to rotate, controlling the extension tube to move linearly.

2. The electric linear actuator according to claim 1, characterized in that: The motor shaft has a protrusion near the self-locking assembly. The self-locking assembly includes a coil housing, a friction plate, an armature, and a connecting block. The connecting block fixes the coil housing and the motor together. The friction plate and the armature are sandwiched between the connecting block and the coil housing. The armature has a center hole corresponding to the protrusion. The coil housing has a coil post inside and a coil outside the coil post. The end of the coil housing has several spring holes with springs inside. When the spring is in its natural state, one end of the spring extends out of the spring hole and abuts against the friction plate.

3. The electric linear actuator according to claim 2, characterized in that: The bump is polygonal.

4. The electric actuator according to claim 1 or 2, characterized in that: The execution component also includes a magnet, a PCB board, and a fixing seat. The outer wall of the drive nut is provided with a mounting seat, the mounting seat contains a magnet, and the outer side of the magnet is provided with a PCB board. The PCB board is fixed in the sleeve II by a bearing seat and a fixing seat, and the PCB board is provided with several Hall elements.

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