CN216216320U

CN216216320U - Electric push rod

Info

Publication number: CN216216320U
Application number: CN202121545289.7U
Authority: CN
Inventors: 钟翰万; 刘英杰
Original assignee: Hanwan Zhong
Current assignee: Hanwan Zhong
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2022-04-05
Anticipated expiration: 2031-07-07

Abstract

The application provides an electric push rod, because of the arrangement of the anti-rotation sleeve, the outer tube is sleeved outside the inner tube, the outer side wall of the outer tube is provided with a plurality of limiting notches, the inner wall of the anti-rotation sleeve is provided with limiting blocks corresponding to the limiting notches, the anti-rotation sleeve is sleeved on the outer side wall of the outer tube, and the limiting blocks are clamped in the limiting notches; due to the matching between the limiting notch and the limiting block, the outer tube can be prevented from rotating along with the rotation of the screw rod due to the rotation of the screw rod, and the position of the outer tube can be stably kept. Simultaneously through burning the control program in the PCB board, then through the required flexible length of procedure setting inner tube after, the PCB board then can calculate the required turned angle of driving motor output shaft according to the flexible length of setting for, realized reaching the purpose of self-control through setting up flexible length, intelligent degree is high.

Description

Electric push rod

Technical Field

The utility model relates to the field of push rods, in particular to an electric push rod.

Background

The electric push rod is a linear driving device, utilizes the transmission of a screw rod nut to convert the rotary motion of a motor into the linear motion of the push rod, and can be used as an execution machine in various simple or complex process flows.

The traditional electric push rod mainly comprises a motor, a transmission worm wheel, a screw rod lifting assembly and a push rod, wherein the transmission worm wheel is driven by the motor to rotate and is sleeved on a screw rod; the motor works to drive the transmission worm wheel to rotate, so as to drive the screw rod to rotate, and the screw rod drives the lifting nut to move forwards or backwards, so that the push rod moves forwards or backwards;

however, the push rod in the prior art has the following disadvantages:

1. the transmission of the existing electric push rod cannot be controlled by setting the telescopic length, and the intelligent degree is low.

2. In the process of the existing electric push rod, a motor drives a screw rod to rotate, and because the outer pipe is not provided with any protection device, the outer pipe also rotates along with the rotation phenomenon caused by inertia caused by the rotation of the screw rod.

Thus, the prior art is subject to improvements and improvements.

Disclosure of Invention

In order to solve the above problems, the present invention provides an electric push rod, which is provided with a lower limit switch and an upper limit switch, that is, when the push rod extends to a maximum length or retracts to a minimum length, the upper limit switch or the lower limit switch controls a driving motor to stop working through a PCB, so that the electric push rod can be effectively protected, and the inner tube can be prevented from falling off due to excessive forward movement of the inner tube or the screw can be prevented from being damaged due to excessive backward movement of the inner tube.

In order to achieve the purpose, the utility model adopts the technical scheme that: an electric push rod comprises a gear box and a driving assembly, wherein the driving assembly comprises a driving motor; a push rod assembly is arranged in the gear box, wherein the push rod assembly comprises a screw rod, a first transmission gear set in transmission connection with the screw rod, a nut movably sleeved on the screw rod, an inner pipe sleeved on the screw rod and fixedly assembled on the nut, and an outer pipe assembly clamped on the gear box, wherein a driving motor drives the transmission gear set to rotate, and the transmission gear set drives the screw rod to rotate and enables the inner pipe fixedly connected with the nut to move along the axis direction of the screw rod; the method is characterized in that: the outer tube assembly comprises an outer tube and an anti-rotation sleeve, wherein the outer tube is sleeved outside the inner tube, a plurality of limiting notches are formed in the outer side wall of the outer tube, limiting blocks corresponding to the limiting notches are arranged on the inner wall of the anti-rotation sleeve, the anti-rotation sleeve is sleeved on the outer side wall of the outer tube, and the limiting blocks are clamped in the limiting notches; simultaneously the inside control assembly that still is provided with of gear box, this control assembly include PCB board, potentiometre, second transmission gear group, the PCB board respectively with potentiometre, CD-ROM drive motor electric connection, the potentiometre is equipped with the connecting axle, the connecting axle is equipped with driven gear, and wherein driven gear passes through second transmission gear group and first transmission gear group realizes the transmission.

Furthermore, a plurality of locating grooves are formed in the outer side wall of the anti-rotation sleeve, the gear box is provided with a clamping groove used for assembling the anti-rotation sleeve, a plurality of locating lugs corresponding to the locating grooves are arranged on the surface of the clamping groove, the anti-rotation sleeve is clamped in the clamping groove, and the locating lugs on the surface of the clamping groove are assembled in the clamping groove on the outer side face of the anti-rotation sleeve.

Furthermore, the anti-rotation sleeves comprise two semicircular sub anti-rotation sleeves, and the two sub anti-rotation sleeves are detachably connected through screws.

The control assembly further comprises a first bearing arranged in the gear box, a return spring sleeved on the outer pipe and clamped in the gear box, and the control assembly further comprises an upper limit switch, a lower limit switch and a starting capacitor; the upper limit switch, the lower limit switch and the starting capacitor are all electrically connected with the PCB, the lower limit switch and the upper limit switch are arranged side by side, and the upper limit switch is tightly attached to the outer side wall of the outer tube and is in a pressed state; one end of the screw rod is movably assembled with the first bearing, and the other end of the screw rod penetrates into the inner pipe; one end of the outer pipe is clamped in the gear box, and the other end of the outer pipe extends out of the gear box; the inner pipe moves along the axial direction of the screw and pushes the outer pipe to move in the direction far away from the first bearing, the outer side wall of the outer pipe leaves the upper limit switch, the driving motor stops working, and the outer pipe realizes resetting under the action of the reset spring; the inner tube moves along the axis direction of the screw rod and pushes the outer tube to move towards the direction close to the first bearing, the outer side wall of the nut connected with the tail end of the inner tube presses the lower limit switch, the driving motor stops working, and the outer tube is reset under the action of the reset spring.

Further, the first transmission gear set comprises a spline, a double-tooth gear and a worm connected with an output shaft of the driving motor, wherein a plurality of convex blocks are uniformly distributed on the surface of the spline along the circumferential direction of the spline, a plurality of open grooves corresponding to the convex blocks are formed in the inner side wall of the double-tooth gear, the spline is fixedly sleeved at one end of the screw rod, the double-tooth gear is sleeved on the spline, and the convex blocks on the spline are clamped on the corresponding open grooves; the worm is meshed with the double-tooth gear.

Further, the second transmission gear set comprises a first-stage transmission reduction gear and a second-stage transmission reduction gear, wherein a worm of the first-stage transmission reduction gear is meshed with the worm, the second-stage transmission reduction gear is meshed with the first-stage transmission reduction gear, and the driven gear is meshed with the second-stage transmission reduction gear.

Further, the push rod assembly further comprises a reinforcing bearing, the reinforcing bearing is sleeved at one end of the screw rod, and the double-tooth gear is located between the first bearing and the reinforcing bearing.

Further, one end, far away from the reinforcing bearing, of the nut is integrally formed with a threaded sleeve, an external thread is arranged on the outer side face of the threaded sleeve, an internal thread is arranged on the inner side wall of one end of the inner pipe, and the inner pipe is assembled with the external thread of the threaded sleeve through the internal thread and is connected with the nut.

Furthermore, the joint of the outer pipe and the gear box is also provided with a front-end waterproof sleeve.

Furthermore, the gear box includes first gear box, the second gear box that the symmetry set up, and the inner wall door of first gear box, second gear box edge all is provided with the sealed trench of circle, and wherein first gear box assembles with the second gear box, and is provided with the circle sealing washer in the seal groove between a gear box and the second gear box.

The utility model has the beneficial effects that:

1. in the application, as the anti-rotation sleeve is arranged, the outer pipe is sleeved outside the inner pipe, the outer side wall of the outer pipe is provided with a plurality of limiting notches, the inner wall of the anti-rotation sleeve is provided with limiting blocks corresponding to the limiting notches, the anti-rotation sleeve is sleeved on the outer side wall of the outer pipe, and the limiting blocks are clamped in the limiting notches; due to the matching between the limiting notch and the limiting block, the outer tube can be prevented from rotating along with the rotation of the screw rod due to the rotation of the screw rod, and the position of the outer tube can be stably kept.

2. In the application, a control program can be burnt on a PCB, after the telescopic length required by an inner pipe is set through the program, the PCB can calculate the required rotation angle of an output shaft of a driving motor according to the set telescopic length, the PCB controls the driving motor to rotate forwards or backwards, when the driving motor is started, a first transmission gear set can drive a second transmission gear set to rotate, the second transmission gear set drives a driven gear on a potentiometer, wherein each rotation of a sawtooth on the driven gear represents an angle, and when the number of teeth of a rotation saw measured by the potentiometer reaches the required rotation angle of the driving motor, the PCB controls the driving motor to stop. The purpose of achieving self-control by setting the telescopic length is achieved, and the intelligent degree is high.

Drawings

Fig. 1 is a schematic perspective view of the electric putter of the present invention.

Fig. 2 is a schematic view of the internal structure of the electric putter of the present invention.

Fig. 3 is a schematic longitudinal sectional structure of the electric putter of the present invention.

Fig. 4 is a schematic structural view of the outer tube of the present invention.

FIG. 5 is a schematic view of the internal structure of the gear case of the present invention

FIG. 6 is a schematic structural view of the anti-rotation sleeve of the present invention

The reference numbers illustrate: the gear box comprises a gear box 1, a clamping groove 1011, a positioning bump 102, a driving motor 2, an outer pipe 11, a limiting notch 111, an inner pipe 12, a double-tooth gear 13, a first bearing 14, a reinforcing bearing 15, a screw 16, a return spring 17, an anti-rotating sleeve 18, a limiting block 181, a positioning groove 182, a potentiometer 19, a driven gear 20, a worm 21, a lower limit switch 22, an upper limit switch 23, a PCB 24, a starting capacitor 25, a primary transmission reduction gear 26, a secondary transmission reduction gear 27, a front-end waterproof sleeve 28, a sealing ring 29, a spline 10, a nut 100 and a threaded sleeve 1001.

Detailed Description

Referring to fig. 1-6, an electric putter includes a gear box 1, a driving assembly including a driving motor 2; a push rod assembly is arranged in the gear box 1, wherein the push rod assembly comprises a screw rod 16, a first transmission gear set in transmission connection with the screw rod 16, a nut 100 movably sleeved on the screw rod 16, an inner tube 12 sleeved on the screw rod 16 and fixedly assembled on the nut 100, and an outer tube assembly clamped on the gear box 1, wherein the drive motor 2 drives the transmission gear set to rotate, the first transmission gear set drives the screw rod 16 to rotate, and the inner tube 12 fixedly connected with the nut 100 moves along the axial direction of the screw rod 16; the outer tube assembly comprises an outer tube 11 and an anti-rotation sleeve 18, wherein the outer tube 11 is sleeved outside the inner tube 12, a plurality of limiting notches 111 are formed in the outer side wall of the outer tube 11, limiting blocks 181 corresponding to the limiting notches 111 are arranged on the inner wall of the anti-rotation sleeve 18, the anti-rotation sleeve 18 is sleeved on the outer side wall of the outer tube 11, and the limiting blocks 181 are clamped in the limiting notches 111; meanwhile, a control assembly is further arranged inside the gear box 1 and comprises a PCB (printed circuit board) 24, a potentiometer 19 and a second transmission gear set, the PCB 24 is respectively electrically connected with the potentiometer 19 and the driving motor 2, the potentiometer 19 is provided with a connecting shaft, the connecting shaft is provided with a driven gear 20, and the driven gear 20 is in transmission with the first transmission gear set through the second transmission gear set.

In the application, as the anti-rotation sleeve 18 is arranged, the outer tube 11 is sleeved outside the inner tube 12, the outer side wall of the outer tube 11 is provided with a plurality of limiting notches 111, the inner wall of the anti-rotation sleeve 18 is provided with a limiting block 181 corresponding to the limiting notches 111, the anti-rotation sleeve 18 is sleeved on the outer side wall of the outer tube 11, and the limiting block 181 is clamped in the limiting notches 111; that is, due to the fit between the limiting notch 111 and the limiting block 181, the outer tube 11 can be prevented from following rotation due to the inertia of the rotation of the screw 16, and the position of the outer tube 11 can be stably maintained.

In the application, a control program can be burnt on the PCB 24, and then after the telescopic length required by the inner tube 12 is set through the program, the PCB 24 can calculate the required rotation angle of the output shaft of the driving motor 2 according to the set telescopic length, the PCB 24 controls the driving motor 2 to rotate forward/backward, when the driving motor 2 is started, the first transmission gear set can drive the second transmission gear set to rotate, the second transmission gear set drives the driven gear 20 on the potentiometer 19, wherein one sawtooth is represented by rotating every time the driven gear 20, and when the number of rotating sawteeth measured by the potentiometer 19 reaches the required rotation angle of the driving motor 2, the PCB 24 controls the driving motor 2 to stop. The purpose of achieving self-control by setting the telescopic length is achieved, and the intelligent degree is high.

In order to further improve the stability of the outer tube 11 and avoid the outer tube 11 protecting jacket from slipping with the gear box 1, a plurality of positioning grooves 182 are formed in the outer side wall of the anti-rotation jacket 18, the gear box 1 is provided with a clamping groove 1011 for assembling the anti-rotation jacket 18, a plurality of positioning protrusions 102 corresponding to the positioning grooves 182 are arranged on the surface of the clamping groove 1011, the anti-rotation jacket 18 is clamped in the clamping groove 1011, and the positioning protrusions 102 on the surface of the clamping groove 1011 are assembled in the clamping groove 1011 on the outer side wall of the anti-rotation jacket 18. The positioning lug 102 on the surface of the clamping groove 1011 is assembled in the clamping groove 1011 on the outer side surface of the anti-rotation sleeve 18, so that the outer pipe 11 protecting sleeve and the gear box 1 can be effectively prevented from slipping.

Further, the anti-rotation sleeve 18 comprises two semicircular sub anti-rotation sleeves 18, and the two sub anti-rotation sleeves 18 are detachably connected through screws. When one of the sub anti-rotation sleeves 18 is damaged, only the corresponding sub anti-rotation sleeve 18 needs to be replaced.

Further, the control assembly further comprises a first bearing 14 arranged in the gear box 1, a return spring 17 sleeved on the outer tube 11 and clamped in the gear box 1, and the control assembly further comprises an upper limit switch 23, a lower limit switch 22 and a starting capacitor 25; the upper limit switch 23, the lower limit switch 22 and the starting capacitor 25 are all electrically connected with the PCB 24, and the lower limit switch 22 and the upper limit switch 23 are arranged side by side, wherein the upper limit switch 23 is tightly attached to the outer side wall of the outer tube 11 and is in a pressed state; wherein one end of the screw 16 is movably assembled with the first bearing 14, and the other end of the screw 16 penetrates into the inner pipe 12; one end of the outer pipe 11 is clamped in the gear box 1, and the other end of the outer pipe 11 extends out of the gear box 1; the inner tube 12 moves along the axial direction of the screw 16 and pushes the outer tube 11 to move away from the first bearing 14, so that the outer side wall of the outer tube 11 leaves the upper limit switch 23, the driving motor 2 stops working, and the outer tube 11 is reset under the action of the reset spring 17; the inner tube 12 moves along the axial direction of the screw 16 and pushes the outer tube 11 to move towards the direction close to the first bearing 14, the outer side wall of the nut 100 connected with the end of the inner tube 12 presses the lower limit switch 22, the driving motor 2 stops working, and the outer tube 11 is reset under the action of the reset spring 17.

The lower limit switch 22 and the upper limit switch 23 are provided in the present application, that is, the electric push rod in the present application can have an upper limit stroke and a lower limit stroke, that is, when the push rod extends to a maximum length or retracts to a minimum length, the upper limit switch 23 or the lower limit switch 22 can control the driving motor 2 to stop working through the PCB 24, so that the electric push rod can be effectively protected, and the inner tube 12 can be prevented from falling off due to the excessive forward movement of the inner tube 12 or the screw 16 can be prevented from being damaged due to the excessive backward movement of the inner tube 12.

The upper limit stroke and the lower limit stroke of the electric push rod are controlled by the outer tube 11, the inner tube 12 drives the nut 100 to press the lower limit switch 22 in the lower limit stroke, the inner tube 12 drives the outer tube 11 to leave the upper limit switch 23 in the upper limit stroke,

further, the first transmission gear set comprises a spline 10, a double-tooth gear 13 and a worm 21 connected with an output shaft of the driving motor 2, wherein a plurality of convex blocks are uniformly distributed on the surface of the spline 10 along the circumferential direction of the spline, a plurality of open grooves corresponding to the convex blocks are formed in the inner side wall of the double-tooth gear 13, the spline 10 is fixedly sleeved at one end of the screw 16, the double-tooth gear 13 is sleeved on the spline 10, and the convex blocks on the spline 10 are clamped on the corresponding open grooves; the worm 21 meshes with the double toothed gear 13.

Further, the second transmission gear set comprises a first transmission reduction gear 26 and a second transmission reduction gear 27, wherein the first transmission reduction gear 26 is meshed with the worm 21, the second transmission reduction gear 27 is meshed with the first transmission reduction gear 26, and the driven gear 20 is meshed with the second transmission reduction gear 27.

Further, the push rod assembly further comprises a reinforcing bearing 15, the reinforcing bearing 15 is sleeved at one end of the screw rod 16, and the double-tooth gear 13 is located between the first bearing 14 and the reinforcing bearing 15. Because the phenomena of tooth grinding, gear swing and the like are easily generated by the single bearing, the bearing 15 can be reinforced, and the double-bearing structure ensures that the gear runs more stably.

Further, a threaded sleeve 1001 is integrally formed at one end of the nut 100 away from the reinforcing bearing 15, an external thread is provided on an outer side surface of the threaded sleeve 1001, an internal thread is provided on an inner side wall of one end of the inner tube 12, and the inner tube 12 is fitted with the external thread of the threaded sleeve 1001 through the internal thread and is connected to the nut 100. In this embodiment, the inner tube 12 is assembled with the external thread of the threaded sleeve 1001 through the internal thread of the inner tube 12, and is connected to the nut 100, that is, the inner tube 12 and the nut 100 are detachably connected, that is, a user can select inner tubes 12 with different lengths to assemble with the nut 100 according to actual use requirements, so that the applicability of the whole push rod is stronger.

Further, a front end waterproof sleeve 28 is arranged at the joint of the outer pipe 11 and the gear box 1. The function lies in that the infiltration of external steam from the gap between outer tube 11 and gear box 1 can be effectively avoided, avoid corroding outer tube 11 and gear box 1.

Further, the gear box 1 includes the first gear box 1, the second gear box 1 that the symmetry set up, and the inner wall door at first gear box 1, the edge of second gear box 1 all is provided with the sealed trench of round, wherein first gear box 1 and second gear box 1 fit together, and is provided with a round sealing washer 29 in the seal groove between a gear box 1 and the second gear box 1. The effect lies in can effectively avoiding the infiltration of external steam from the gap between first gear box 1, the second gear box 1, avoids the inside device of gear box 1.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.

Claims

1. An electric putter which characterized in that: the device comprises a gear box and a driving assembly, wherein the driving assembly comprises a driving motor; a push rod assembly is arranged in the gear box, wherein the push rod assembly comprises a screw rod, a first transmission gear set in transmission connection with the screw rod, a nut movably sleeved on the screw rod, an inner pipe sleeved on the screw rod and fixedly assembled on the nut, and an outer pipe assembly clamped on the gear box, wherein a driving motor drives the first transmission gear set to rotate, the first transmission gear set drives the screw rod to rotate, and the inner pipe fixedly connected with the nut moves along the axis direction of the screw rod; the outer tube assembly comprises an outer tube and an anti-rotation sleeve, wherein the outer tube is sleeved outside the inner tube, a plurality of limiting notches are formed in the outer side wall of the outer tube, limiting blocks corresponding to the limiting notches are arranged on the inner wall of the anti-rotation sleeve, the anti-rotation sleeve is sleeved on the outer side wall of the outer tube, and the limiting blocks are clamped in the limiting notches; simultaneously the inside control assembly that still is provided with of gear box, this control assembly include PCB board, potentiometre, second transmission gear group, the PCB board respectively with potentiometre, CD-ROM drive motor electric connection, the potentiometre is equipped with the connecting axle, the connecting axle is equipped with driven gear, and wherein driven gear passes through second transmission gear group and first transmission gear group realizes the transmission.

2. An electric putter as claimed in claim 1, wherein: the lateral wall of the anti-rotation sleeve is provided with a plurality of locating grooves, the gear box is provided with a clamping groove used for assembling the anti-rotation sleeve, the surface of the clamping groove is provided with a plurality of locating lugs corresponding to the locating grooves, the anti-rotation sleeve is clamped in the clamping groove, and the locating lugs on the surface of the clamping groove are assembled in the clamping groove on the lateral surface of the anti-rotation sleeve.

3. An electric putter as claimed in claim 1, wherein: the anti-rotation sleeves comprise two semicircular sub anti-rotation sleeves, and the two sub anti-rotation sleeves are detachably connected through screws.

4. An electric putter as claimed in claim 1, wherein: the control assembly also comprises an upper limit switch, a lower limit switch and a starting capacitor; the upper limit switch, the lower limit switch and the starting capacitor are all electrically connected with the PCB, the lower limit switch and the upper limit switch are arranged side by side, and the upper limit switch is tightly attached to the outer side wall of the outer tube and is in a pressed state; one end of the screw rod is movably assembled with the first bearing, and the other end of the screw rod penetrates into the inner pipe; one end of the outer pipe is clamped in the gear box, and the other end of the outer pipe extends out of the gear box; the inner pipe moves along the axial direction of the screw and pushes the outer pipe to move in the direction far away from the first bearing, the outer side wall of the outer pipe leaves the upper limit switch, the driving motor stops working, and the outer pipe realizes resetting under the action of the reset spring; the inner tube moves along the axis direction of the screw rod and pushes the outer tube to move towards the direction close to the first bearing, the outer side wall of the nut connected with the tail end of the inner tube presses the lower limit switch, the driving motor stops working, and the outer tube is reset under the action of the reset spring.

5. An electric putter as claimed in claim 1 or 4, characterized in that: the first transmission gear set comprises a spline, a double-tooth gear and a worm connected with an output shaft of the driving motor, wherein a plurality of convex blocks are uniformly distributed on the surface of the spline along the circumferential direction of the spline; the worm is meshed with the double-tooth gear.

6. An electric putter as claimed in claim 5, wherein: the second transmission gear set comprises a first-stage transmission reduction gear and a second-stage transmission reduction gear, wherein a worm of the first-stage transmission reduction gear is meshed with the worm, the second-stage transmission reduction gear is meshed with the first-stage transmission reduction gear, and the driven gear is meshed with the second-stage transmission reduction gear.

7. An electric putter as claimed in claim 5, wherein: the push rod assembly further comprises a reinforcing bearing, the reinforcing bearing is sleeved at one end of the screw rod, and the double-tooth gear is located between the first bearing and the reinforcing bearing.

8. An electric putter as claimed in claim 5, wherein: the one end integrated into one piece that the nut kept away from the reinforcement bearing has the screw sleeve, and this screw sleeve's lateral surface is provided with the external screw thread, the inside wall of inner tube one end is provided with the internal thread, the inner tube passes through the internal thread and joins in marriage with the external screw thread of screw sleeve to realize being connected with the nut.

9. An electric putter as claimed in claim 1, wherein: the joint of the outer pipe and the gear box is also provided with a front-end waterproof sleeve.

10. An electric putter as claimed in claim 1, wherein: the gear box comprises a first gear box and a second gear box which are symmetrically arranged, a circle of sealing groove is formed in each of inner wall doors at the edges of the first gear box and the second gear box, the first gear box and the second gear box are assembled, and a circle of sealing ring is arranged in a sealing groove between the first gear box and the second gear box.