Electric push rod with precise positioning function

Abstract

The utility model provides a precise positioning electric push rod, which relates to the technical field of electric driving and comprises an outer tube, a push rod nut and a mounting seat, a positioning ring seat is mounted on one side of the outer tube facing the mounting seat, a mounting block is arranged on the positioning ring seat, a Hall PCB (printed circuit board) and an induction mechanism are arranged on the mounting block, and the Hall PCB and the induction mechanism are arranged on the outer tube. The Hall PCB is arranged right above the induction mechanism, the induction mechanism comprises a positioning hoop, an annular magnet, an induction firing pin and a reset spring, an iron core is arranged at one end, facing the annular magnet, of the induction firing pin, the other end of the induction firing pin extends out of a mounting block, and the reset spring is connected between the induction firing pin and the positioning hoop. The push rod nut is provided with an abutting rod aiming at the induction firing pin, and the abutting rod abuts against the induction firing pin. According to the utility model, the abutting rod abuts against the induction probe, so that the iron core extends into the induction probe and the magnetic field of the annular magnet is gradually enhanced, and the Hall PCB induces the potential difference so as to accurately position and stop the push rod nut.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive, in particular to a precisely positioned electric push rod. Background Art

[0002] Electric linear actuators, also known as linear drives, can be considered as a structural extension of rotary motors. Electric linear actuators are a new type of linear actuator mainly composed of motor linear actuators and control devices. Existing electric linear actuators usually use limit switches for feedback control, but this control method causes the initial position of the nut to be inaccurate when the electric linear actuator is working. For some high-precision operations, the difference in the initial position will affect the accuracy of the operation.

[0003] Application number CN201721068843.0 discloses an automatic positioning electric push rod, which discloses that "the outer wall of the nut 5 is provided with a positioning clamp 8, the positioning clamp 8 is installed with an induction magnet 9, and the Hall PCB board 13 is installed directly above the induction magnet 9."

[0004] When implementing this technical solution, there are at least the following defects: 1. Reducing the volume of the induction magnet will inevitably lead to a reduction in the magnetic field, thereby reducing the potential difference induced by the Hall PCB board and making the Hall PCB board insensitive; 2. The magnet itself has a stable magnetic field. When it is installed on the nut and moves left and right and gradually approaches the Hall PCB board, the Hall PCB board will sense the potential difference brought by the magnetic field of the induction magnet, which will cause the Hall PCB board to misjudge and stop the motor prematurely, affecting the positioning accuracy of the electric push rod. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the utility model provides an electric push rod with precise positioning, which solves the problems raised in the above-mentioned background technology.

[0007] (II) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A precisely positioned electric push rod comprises an outer tube, a lead screw, a push rod nut and a mounting seat, the lead screw is passed through the mounting seat, the push rod nut is sleeved on the lead screw, a positioning ring seat is mounted on the side of the outer tube facing the mounting seat, the mounting seat abuts against the other side of the positioning ring seat, a mounting block is arranged on the positioning ring seat, a Hall PCB board and a sensing mechanism are provided on the mounting block, the Hall PCB board is arranged directly above the sensing mechanism, the sensing mechanism comprises a positioning hoop, an annular magnet, an induction pin and a reset spring, the annular magnet is concave-convexly clamped on the rear side of the positioning hoop, the induction pin is slidably connected to the positioning hoop, an iron core is arranged on one end of the induction pin facing the annular magnet, the other end of the induction pin extends out of the mounting block, and the reset spring is connected between the induction pin and the positioning hoop.

[0010] Preferably, the push rod nut is provided with a resistance rod for the sensing striker, and the resistance rod is in resistance to the sensing striker.

[0011] Preferably, an adjustment mechanism is provided on the outer edge of the push rod nut, and the adjustment mechanism includes an adjustment ring, a sliding ring and a resistance spring. The adjustment ring is threadedly connected on the push rod nut, the sliding ring is slidingly connected on the push rod nut, the adjustment ring is in resistance on the sliding ring, the resistance spring is connected between the sliding ring and the push rod nut, and the resistance rod is fixed on the sliding ring.

[0012] Preferably, an outer edge of the push rod nut is provided with an adjustment ring groove, the adjustment ring thread is sleeved in the adjustment ring groove, the bottom wall of the adjustment ring groove is provided with a plurality of sliding grooves extending axially, the sliding ring is slidingly fitted on the sliding groove, and the return spring is abutted between the side wall of the sliding groove and the sliding ring.

[0013] Preferably, a limiting plate is provided on the sensing striker of the positioning clamp, and the limiting plate is installed in the positioning clamp in a sliding manner, and the return spring is abutted between the limiting plate and the clamp.

[0014] Preferably, a mounting hole is provided on the mounting block, the positioning clamp is inserted into the mounting hole, a limiting block is provided on the front side of the inner wall of the mounting hole, and the limiting block abuts against the front end of the positioning clamp.

[0015] Preferably, the inner wall of the outer tube is provided with a plurality of guide grooves along the axial direction, the outer edge of the positioning ring seat is provided with a plurality of guide blocks, a positioning ring is provided on the rear side of the outer edge of the positioning ring seat, the guide blocks are inserted into the guide grooves, and the positioning ring abuts against the end of the outer tube.

[0016] (III) Beneficial effects

[0017] The utility model provides a precisely positioned electric push rod, which has the following beneficial effects:

[0018] 1. The utility model makes the abutment rod on the push rod nut abut against the induction striker, so that the iron core on the induction striker extends into the annular magnet. As the iron core gradually extends into the annular magnet, the magnetic field of the annular magnet gradually increases, which causes the magnetic field of the Hall PCB to change, that is, to generate a potential difference, so that the Hall PCB generates induction, controls the electric push rod to stop, avoids misjudgment caused by the potential difference brought by the moving magnet, and increases the magnetic field of the annular magnet, so that the induction effect of the Hall PCB is more accurate, thereby ensuring the accuracy of the positioning of the electric push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the mechanism of a precisely positioned electric push rod of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the positioning ring seat in the utility model;

[0021] Figure 3 It is a structural schematic diagram of the induction mechanism in the utility model;

[0022] Figure 4 It is a structural schematic diagram of the push rod nut in the utility model;

[0023] Figure 5 for Figure 4 sectional view of .

[0024] In the figure: 1. outer tube; 2. screw rod; 3. push rod nut; 4. mounting seat; 5. positioning ring seat; 6. mounting block; 7. Hall PCB board; 8. positioning clamp; 9. ring magnet; 10. induction striker; 11. reset spring; 12. iron core; 13. adjustment ring; 14. sliding ring; 15. resistance spring; 16. resistance rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] The utility model provides an electric push rod with precise positioning.

[0027] like Figure 1-5As shown, it includes an outer tube 1, a screw 2, a push rod nut 3 and a mounting seat 4, the screw is inserted into the mounting seat 4, the push rod nut 3 is sleeved on the screw 2, a positioning ring seat 5 is installed on the side of the outer tube 1 facing the mounting seat 4, a plurality of guide grooves are opened in the axial direction on the inner wall of the outer tube 1, a plurality of guide blocks are arranged on the outer edge of the positioning ring seat 5, a positioning ring is arranged on the rear side of the outer edge of the positioning ring seat 5, the guide blocks are inserted into the guide grooves, the positioning ring abuts against the end of the outer tube 1, the mounting seat 4 abuts against the other side of the positioning ring seat 5, a mounting block 6 is arranged on the positioning ring seat 5, a Hall PCB board 7 and a sensing mechanism are opened on the mounting block 6, the Hall PCB board 7 is arranged just above the sensing mechanism, and the sensing mechanism It includes a positioning hoop 8, an annular magnet 9, an induction striker 10 and a reset spring 11. A mounting hole is provided on the mounting block 6. The positioning hoop 8 is inserted into the mounting hole. A limiting block is provided on the front side of the inner wall of the mounting hole. The limiting block abuts against the front end of the positioning hoop 8. The annular magnet 9 is clamped on the rear side of the positioning hoop 8 with a concave-convex fit. The induction striker 10 is slidably connected to the positioning hoop 8. An iron core 12 is provided at one end of the induction striker 10 facing the annular magnet 9. The other end of the induction striker 10 extends out of the mounting block 6. A limiting plate is provided on the induction striker 10 of the positioning hoop 8. The limiting plate is slidably installed in the positioning hoop 8. The reset spring 11 abuts between the limiting plate and the hoop 8.

[0028] like Figure 1 , 4 5. An adjustment mechanism is provided on the outer edge of the push rod nut 3, and the adjustment mechanism includes an adjustment ring 13, a sliding ring 14 and a resistance spring 15. An adjustment ring 13 groove is provided on the outer edge of the push rod nut 3, and the adjustment ring 13 is threadedly sleeved in the adjustment ring 13 groove. A plurality of sliding grooves extending along the axial direction are provided on the bottom wall of the adjustment ring 13 groove. The sliding ring 14 is slidingly fitted on the sliding groove, and the adjustment ring 13 resists on the sliding ring 14. The resistance spring 15 resists between the side wall of the sliding groove and the sliding ring 14. A vertically arranged mounting plate is provided on the sliding ring 14, and a resistance rod 16 facing the sensing pin 10 and extending toward the sensing probe is fixed on the mounting plate, and the resistance rod 16 resists on the sensing pin 10.

[0029] Working principle: In the utility model, as the push rod nut moves backward on the screw rod, the push rod nut gradually approaches the positioning ring seat until the abutment rod 16 abuts and pushes the sensing probe to slide inward. During the sliding process, the iron core 12 at the end of the sensing probe is gradually inserted into the center of the annular magnet 9. As the iron core 12 gradually extends in, the magnetic field of the annular magnet 9 will gradually increase, causing a potential difference in the magnetic field range where the Hall PCB board is located, thereby causing the Hall PCB board to generate induction and stop the electric push rod, thereby achieving the purpose of accurately positioning the push rod nut, avoiding the magnetic field movement caused by the magnet moving with the push rod nut to affect the sensing judgment of the Hall PCB board, while enhancing the magnetic field and enhancing the sensing sensitivity of the Hall PCB board.

[0030] In addition, the adjusting ring 13 can be rotated to push the abutment rod 16 to move left and right to adjust the initial contact position between the sensing probe and the abutment rod 16, so as to accurately adjust the stop position of the push rod nut and avoid the influence of installation error on the accuracy.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precisely positioned electric push rod, comprising an outer tube, a lead screw, a push rod nut and a mounting seat, wherein the lead screw is inserted into the mounting seat and the push rod nut is sleeved on the lead screw, and is characterized in that: A positioning ring seat is installed on the side of the outer tube facing the mounting seat, and the mounting seat is in contact with the other side of the positioning ring seat. A mounting block is arranged on the positioning ring seat, and a Hall PCB board and a sensing mechanism are provided on the mounting block. The Hall PCB board is arranged directly above the sensing mechanism, and the sensing mechanism comprises a positioning hoop, an annular magnet, an induction striker and a reset spring. The annular magnet is clamped on the rear side of the positioning hoop with a concave-convex fit, and the induction striker is slidingly connected to the positioning hoop. An iron core is arranged on one end of the induction striker facing the annular magnet, and the other end of the induction striker extends out of the mounting block, and the reset spring is connected between the induction striker and the positioning hoop.

2. The electric push rod for precise positioning according to claim 1, characterized in that: The push rod nut is provided with a resistance rod for the induction striker, and the resistance rod is in resistance to the induction striker.

3. The electric push rod for precise positioning according to claim 2, characterized in that: An adjustment mechanism is provided on the outer edge of the push rod nut, and the adjustment mechanism includes an adjustment ring, a sliding ring and a resistance spring. The adjustment ring is threadedly connected on the push rod nut, the sliding ring is slidingly connected on the push rod nut, the adjustment ring is in resistance on the sliding ring, the resistance spring is connected between the sliding ring and the push rod nut, and the resistance rod is fixed on the sliding ring.

4. The electric push rod for precise positioning according to claim 3, characterized in that: An adjustment ring groove is provided on the outer edge of the push rod nut, and the adjustment ring is threadedly sleeved in the adjustment ring groove. A plurality of sliding grooves extending axially are provided on the bottom wall of the adjustment ring groove. The sliding ring is slidingly fitted on the sliding groove, and the return spring is abutted between the side wall of the sliding groove and the sliding ring.

5. The electric push rod for precise positioning according to claim 1, characterized in that: A limiting plate is arranged on the sensing striker of the positioning clamp, and the limiting plate is installed in the positioning clamp in a sliding manner, and the return spring is in contact between the limiting plate and the clamp.

6. The electric push rod for precise positioning according to claim 1, characterized in that: The mounting block is provided with a mounting hole, the positioning clamp is inserted into the mounting hole, a limiting block is provided on the front side of the inner wall of the mounting hole, and the limiting block abuts against the front end of the positioning clamp.

7. The electric push rod for precise positioning according to claim 1, characterized in that: The inner wall of the outer tube is provided with a plurality of guide grooves along the axial direction, the outer edge of the positioning ring seat is provided with a plurality of guide blocks, the rear side of the outer edge of the positioning ring seat is provided with a positioning ring, the guide blocks are inserted into the guide grooves, and the positioning ring abuts against the end of the outer tube.

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