CN211530925U - Novel push rod - Google Patents

Abstract

A novel push rod relates to the technical field of push rods. It includes: fixing a guide pipe; the screw rod is connected with the external power source and rotates around the central shaft under the driving of the external power source; and the push rod assemblies are arranged in the fixed guide pipe and are driven by the motor to be pushed out or retracted along the axial direction of the screw rod. The push rod assembly includes: the first extension assembly is arranged in the fixed guide pipe and is driven by a motor to be pushed out or retracted along the axial direction of the screw rod; and the second extending assembly is arranged in the first transmission pipe and is driven by the screw rod to be pushed out or retracted along the axial direction of the screw rod. By adopting the technical scheme, the device has the advantages of small volume, capability of being pushed out in multiple sections, stable motion, wide application range and strong practicability.

Description

A new type of push rod

technical field

The utility model relates to the technical field of push rods.

Background technique

Electric push rod is an electric drive device that converts the rotary motion of the motor into the linear reciprocating motion of the push rod. It can be used as an executive machine in various simple or complex technological processes to realize remote control, centralized control or automatic control. The principle is: the output shaft of the motor is directly changed into a screw to drive the nut. Turn the rotary motion of the motor into a linear motion, and use the forward and reverse rotation of the motor to complete the push rod action. Electric push rods are mainly used in industrial automation equipment, robots, manipulators, electric lift push-pull systems, etc.

However, the existing electric push rod can only push out one section. When the stroke to be pushed out is long, the length of the push rod can only be extended to meet the demand, so that the electric push rod occupies a large area, so it needs to be improved.

Utility model content

The purpose of the utility model is to provide a new type of push rod in view of the defects and deficiencies of the prior art, which has the advantages of small size, multi-section push-out, smooth movement, wide application range and strong practicability.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the present utility model is: a novel push rod, comprising: a fixed guide tube; a screw rod connected with an external power source and rotated around a central axis under the drive of the external power source; and, Several push rod assemblies are arranged in the fixed guide tube and are pushed out or retracted along the axial direction of the screw rod under the driving of the motor.

The push rod assembly includes: a first extension assembly disposed in the fixed guide tube and pushed out or retracted in the axial direction of the screw rod under the driving of the motor; and, disposed in the first extension A second projecting component on the component that is pushed out or retracted along the axial direction of the lead screw under the driving of the lead screw.

The first extension assembly includes: a first sliding block mounted on the screw rod, which can only reciprocate along the axial direction of the screw rod under the driving of the screw rod; and,

The first transmission pipe that is fixedly installed on the first sliding block and is driven by the first sliding block to extend or retract the fixed guide pipe.

The second extension assembly includes: a second transmission tube assembled in the fixed guide tube; sleeved on the screw rod and movably assembled on the first slider, on the wire rod a first driven screw rod that rotates under the driving of the rod; a transmission member fixedly mounted on the screw rod and used to drive the first driven screw rod to rotate when assembled with the first driven screw rod; And, what is assembled on the first driven screw and fixedly assembled with the second transmission tube can only be driven along the first driven screw by the first driven screw. A second sliding block that reciprocates in the axial direction.

The transmission member is a guide sliding sleeve, the outer surface of the guide sliding sleeve is provided with external spline teeth, and the inner surface of the first driven screw rod is correspondingly provided with internal spline teeth. When the screw rod rotates , the first driven screw is assembled with the inner spline teeth through the outer spline teeth to realize rotation.

Both the fixed guide tube and the first transmission tube are provided with internal spline teeth, the first sliding block and the second sliding block are respectively provided with external spline teeth, and the external spline teeth are connected to the The inner spline teeth are engaged to realize the reciprocating motion of the first sliding block and the second sliding block only along the axial direction of the screw rod, and make the motion more stable.

A first screw bearing is provided on the first driven screw (232) near one end of the first slider, the first screw bearing is in contact with the first slider, and the first driven screw is in contact with the first slider. The moving screw is riveted with the first screw bearing.

The push rod assembly further includes a sealing assembly disposed at the push-out ports of the fixed guide tube and the first transmission tube.

The sealing assembly includes: a sealing rubber sleeve arranged at the push-out ports of the fixed guide tube and the second transmission tube; An O-ring that isolates the cavity from the outside world.

A front fixing lock is also arranged on the second transmission pipe away from the end cap connecting head.

After adopting the above-mentioned technical scheme, the beneficial effects of the present utility model are:

Through the combination of the first driven screw rod and the second sliding nut arranged on the screw rod, the motion of the screw rod can be transmitted, thereby realizing the multi-rod pushing out of the push rod. When a push rod with the same stroke is required, the push rod of the present invention reduces the occupied area by means of multi-section telescopic. In addition, through the spline teeth arranged on the inner walls of the fixed guide tube, the first driven tube and the second driven tube, and the spline teeth arranged on the outer sides of the first sliding nut and the second sliding nut, the first When the driven tube and the second driven tube are extended or retracted, the movement is more stable due to the meshing relationship between the spline teeth. Advantage.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the structural representation of the extended state of the push rod in the present utility model;

Fig. 2 is the structural representation of the retracted state of the push rod in the present utility model;

Fig. 3 is the exploded view of the present utility model;

4 is a half-section view of the present utility model;

FIG. 5 corresponds to an enlarged view of detail A in FIG. 4 .

Description of reference numerals: 1. Motor; 11. Motor housing; 12. Power cord; 13. Screw rod; 14. Rotor; 15. Motor tail cover; 16. Bearing; 17. End cover connector; 2. Push rod; 21, fixed guide tube; 22, first extension component; 221, first slider; 222, first transmission tube; 23, second extension component; 231, second transmission tube; 232, first driven wire Rod; 233, the first transmission part; 234, the second slider; 235, the first screw bearing; 24, the front fixed lock; 25, the sealing assembly; 251, the sealing rubber sleeve; 252, the O-ring; 26, Spline teeth; 27, the third extension component; 271, the second driven screw; 272, the second transmission part; 273, the third slider; 274, the second screw bearing; 275, the third transmission tube; 28. Rubber hoop.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to the present embodiment without creative contribution as needed after reading this specification, but only within the scope of the present invention All new types of claims are protected by the patent law.

This embodiment relates to a new type of push rod. The push rod includes: a fixed guide tube 21, a screw rod 13 and a push rod assembly. The power source of the push rod is a motor, and the motor includes: a motor casing 11, a motor coil, and a rotor. 14. Motor tail cover 15, bearing 16 and end cover connector 17. The motor coil is fixedly installed in the motor casing 11 , the power line 12 is electrically connected to the motor coil, the screw rod 13 is fixedly installed on the rotor 14 , the screw rod 13 is penetrated in the rotor 14 , and the central axis of the screw rod 13 is connected to the center of the rotor 14 . The shafts are coincident, the screw rod 13 goes out from the end cover connector 17 , and the screw rod 13 rotates under the drive of the motor 1 . There are two bearings 16, and they are assembled on the two ends of the screw rod 13 close to the rotor 14 respectively. The motor tail cover 15 is assembled on one end of the motor casing 11, and the motor tail cover 15 is provided with a groove for accommodating the bearing 16. The end cover connecting head 17 is fixedly installed on the other end of the motor 1 , and the other bearing 16 is accommodated in the end cover connecting head 17 . The end cap connecting head 17 is provided with internal threads, the push rod assembly is provided with external threads, and the push rod assembly and the end cap connecting head 17 are threadedly connected. The push rod assembly is arranged in the fixed guide tube 21 and is pushed out or retracted along the axial direction of the screw rod 13 under the driving of the motor 1 .

Further, the push rod assembly includes: a fixed guide tube 21 , a first extension assembly 22 , a second extension assembly 23 , a third extension assembly 27 , a front fixed lock head 24 and a sealing assembly 25 .

One end of the fixed guide tube 21 is provided with an external thread, the end cap connector 17 is provided with an internal thread, and the fixed guide tube 21 is threadedly connected with the end cap connector 17 . The first extension assembly 22 is assembled in the fixed guide tube 21, and is pushed out or retracted along the axial direction of the screw 13 under the drive of the motor 1. The second extension assembly 23 is assembled on the first extension assembly 22, and Driven by the motor 1 to push out or retract along the axial direction of the screw rod 13 , the third extension assembly 27 is assembled in the second extension assembly 23 , and is pushed out or retracted along the axial direction of the screw rod 13 under the drive of the motor 1 . Back, the front fixed lock head 24 is fixedly installed on the end of the third extension member 27 away from the motor 1 .

Further, the first extension component 22 includes: a first sliding block 221 and a first transmission tube 222 . The first sliding block 221 is assembled on the screw rod 13 , and can only reciprocate along the axial direction of the screw rod 13 under the driving of the screw rod 13 . The first transmission tube 222 is fixedly mounted on the first slider 221 , and is extended or retracted to the fixed guide tube 21 under the driving of the first slider 221 .

Further, the second extension assembly 23 includes: a second transmission tube 231 , a first driven screw 232 , a first transmission member 233 , a second sliding block 234 and a first screw bearing 235 .

The second transmission tube 231 is assembled in the first transmission tube 222 , the first driven screw 232 is sleeved on the screw 13 and is movably assembled on the first slider 221 . A first screw bearing 235 is disposed on one end of the first driven screw 232 close to the first sliding block 221 . The first screw bearing 235 is in contact with the first sliding block 221 . A driven screw 232 is riveted to the first screw bearing 235 to make the structural connection of the extension assembly more compact. The first transmission member 233 is fixedly mounted on one end of the screw rod 13 away from the motor 1 . The second sliding block 234 is fixedly assembled on one end of the second transmission tube 231 close to the first sliding block 221 and is engaged with the first driven screw rod 232 .

Further, the third extension assembly 27 includes: a third transmission tube 275 , a second driven screw 271 , a second transmission member 272 , a third sliding block 273 and a second screw bearing 274 .

The third transmission tube 275 is assembled in the second transmission tube 231 , the second driven screw 271 is sleeved on the first screw, and is movably assembled on the second slider 234 . A second screw bearing is disposed on one end of the second driven screw 271 close to the second sliding block 234, the second screw bearing is in contact with the second sliding block 234, and the second driven screw The moving screw 271 is riveted to the second screw bearing, so that the structural connection of the third extension assembly 27 is more compact. The second transmission member 272 is fixedly mounted on the end of the first screw rod away from the motor 1 . The third sliding block 273 is fixedly assembled on one end of the third transmission tube 275 close to the second sliding block 234, and is engaged with the second driven screw 271. The front fixed lock head 24 is fixedly installed on the second transmission tube 231 away from the motor 1 one end.

When the motor 1 rotates, the driving screw 13 rotates around the central axis of the rotor 14, the screw 13 drives the first slider 221 to move axially along the screw 13, and the first slider 221 drives the first transmission tube assembled thereon 222 and the first driven screw 232 move forward, so that the first transmission tube 222 extends out of the fixed guide tube 21; when the first transmission member 233 is assembled with the first driven screw 232, the screw 13 drives the first driven When the moving screw 232 rotates, the first driven screw 232 drives the second sliding block 234 to move axially along the screw 13, and the second sliding block 234 drives the second transmission tube 231 and the first driven screw mounted on it. 232 moves forward, so that the second transmission tube 231 extends; at this time, the first transmission tube 222 and the second transmission tube 231 move forward at the same time; when the second driven screw 271 is assembled with the second transmission member 272, The first driven screw 232 drives the second driven screw 271 to rotate, the second driven screw 271 drives the third slider to move axially along the screw 13, and the third slider drives the third transmission mounted on it. The pipe 275 moves forward, so that the third transmission pipe 275 extends; at this time, the first transmission pipe 222, the second transmission pipe 231 and the third transmission pipe 275 move forward simultaneously.

In this embodiment, the first transmission pipe 222, the second transmission pipe 231 and the third transmission pipe 275 are always extended or retracted at the same time.

Preferably, the first transmission member 233 and the second transmission member 272 are both guide sliding sleeves, the outer spline teeth 26 are provided on the outer side of the guiding sliding sleeve, and the first driven screw rod 232 and the second driven screw rod 271 are The inner spline teeth 26 are correspondingly arranged on the side, and the outer spline teeth 26 are assembled with the inner spline teeth 26 to realize that the screw 13 drives the first driven screw 232 and the first driven screw 232 drives the second driven screw Rod 271.

Preferably, the fixed guide tube 21 , the first transmission tube 222 and the second transmission tube 231 are provided with internal spline teeth 26 , and the outer sides of the first sliding block 221 , the second sliding block 234 and the third sliding block 273 are correspondingly provided There are external spline teeth 26, the internal spline teeth 26 and the external spline teeth 26 have the same module, and the external spline teeth 26 mesh with the internal spline teeth 26 to realize the straight line of the first slider 221 and the second slider 234 movement and guiding.

Further, the sealing assembly 25 is used to isolate the outside world to prevent impurities from entering the inner cavity of the push rod to affect the smooth movement of the push rod and damage the assembly. The sealing assembly 25 includes: a sealing rubber sleeve 251 and an O-ring 252 . There are three sealing rubber sleeves 251, and they are respectively arranged at the push-out ports of the fixed guide tube 21, the first transmission tube 222 and the second transmission tube 231. There are three grooves on the inner side wall of each sealing ring. 252 is provided with 9 pieces, which are installed in the grooves of the three sealant sleeves 251 on average, and the O-ring 252 is used to further isolate the inner cavity of the push rod from the outside world. A rubber band 28 is provided on the outer side of the second driven screw 271 away from the third sliding block 273 to make the extension or retraction of the third transmission tube 275 more stable.

In this embodiment, the push rod can push out three sections in total, that is, the push rod is set as a four-section push rod. In other embodiments, the push rod is set as a push rod with two or three or more than four sections.

The working principle of the present utility model is roughly as follows: when the motor 1 drives the electric push rod to perform the push rod action, the power is turned on, the motor 1 rotates forwardly, the rotor 14 and the screw rod 13 rotate, and the first sliding rod assembled on the screw rod 13 rotates. The block 221 converts the rotation of the screw rod 13 into its own linear motion, and drives the first transmission tube 222 to move forward; at the same time, the screw rod 13 drives the first transmission member 233 to rotate, thereby driving the first driven screw rod 232 to rotate, and the first driven screw rod 232 rotates. A transmission screw drives the second transmission member 272 to rotate, and the second slider 234 and the third slider 273 convert the rotation of the first driven screw 232 and the second driven screw 271 into linear motion, driving the second transmission The pipe 231 and the third transmission pipe 275 move forward; finally, the first transmission pipe 222 and the second transmission pipe 231 extend simultaneously to complete the push rod action.

When the push rod is retracted, the control motor 1 is reversed, the rotor 14 and the screw rod 13 are reversed, the first slider 221, the second slider 234 and the third transmission tube 275 move in the direction close to the motor 1, driving the first slider 221, the second slider 234 and the third transmission tube 275 A transmission tube 222 , the second transmission tube 231 and the third transmission tube 275 are retracted into the fixed guide tube 21 to complete the retraction. During the movement, the motor 1 can be stopped to adjust the extension or retraction length of the push rod.

The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention are not departing from the spirit and scope of the technical solution of the present invention. It should be included in the scope of the claims of the present invention.

Claims (10)

1. a novel push rod, is characterized in that, comprises: fixed guide tube (21); A lead screw (13) connected to the external power source and rotated around the central axis under the drive of the external power source; and, Several push rod assemblies are arranged in the fixed guide tube (21) and are pushed out or retracted along the axial direction of the screw rod (13) under the driving of the motor. 2. The novel push rod according to claim 1, wherein the push rod assembly comprises: a first extension component (22) disposed in the fixed guide tube (21) and pushed out or retracted along the axial direction of the screw rod (13) under the driving of the motor (1); and, A second projecting component (23) provided on the first projecting component (22) and being pushed out or retracted along the axial direction of the lead screw (13) under the driving of the lead screw (13) . 3. The new type of push rod according to claim 2, characterized in that, the first extension component (22) comprises: a screw rod (13) assembled on the screw rod (13) A first sliding block (221) that can only reciprocate along the axial direction of the screw (13) under driving; and, A first transmission tube (222) that is fixedly installed on the first sliding block (221) and is driven by the first sliding block (221) to extend or retract the fixed guide pipe (21). 4. The new push rod according to claim 3, characterized in that, the second extension assembly (23) comprises: a second transmission pipe (231) assembled in the fixed guide pipe (21); A first driven screw ( 232); a transmission member fixedly mounted on the screw rod (13) and used to drive the first driven screw rod (232) to rotate when assembled with the first driven screw rod (232); and, What is assembled on the first driven screw (232) and fixedly assembled with the second transmission tube (231) can only be driven along the A second sliding block (234) that reciprocates in the axial direction of the first driven screw (232). 5. The new push rod according to claim 4, characterized in that, the transmission member is a guide sliding sleeve, and external spline teeth (26) are provided on the outer surface of the guide sliding sleeve, and the first driven An inner spline tooth (26) is correspondingly provided on the inner surface of the screw rod (232), and when the screw rod (13) rotates, the first driven screw rod (232) passes through the outer spline tooth (26). ) is assembled with the internal spline teeth (26) to achieve rotation. 6. The new push rod according to claim 5, characterized in that, both the fixed guide tube (21) and the first transmission tube (222) are provided with internal spline teeth (26), and the first sliding The block (221) and the second sliding block (234) are provided with external spline teeth (26) correspondingly, and the external spline teeth (26) mesh with the internal spline teeth (26) to achieve all the The first sliding block (221) and the second sliding block (234) only reciprocate along the axial direction of the screw rod (13), so that the movement is more stable. 7. The novel push rod according to claim 6, characterized in that, a first screw bearing (235) is provided on one end of the first driven screw (232) close to the first slider (221) , the first screw bearing (235) is in contact with the first sliding block (221), and the first driven screw (232) is riveted with the first screw bearing (235). 8. The new push rod according to claim 7, characterized in that, the push rod assembly further comprises a sealing assembly (25), and the sealing assembly (25) is arranged on the fixed guide tube (21) and the At the push-out port of the first transmission tube (222). 9 . The new push rod according to claim 8 , wherein the sealing assembly ( 25 ) comprises: disposed at the push-out ports of the fixed guide tube ( 21 ) and the second transmission tube ( 231 ). 10 . the sealant sleeve (251); and, An O-ring (252) arranged on the inner side wall of the sealant sleeve (251) and used to further isolate the inner cavity of the push rod from the outside. 10. The new push rod according to claim 9, characterized in that, a front fixing lock head (24) is further provided on the second transmission pipe (231) away from the end cap connecting head (17).

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