CN217749839U

CN217749839U - Servo motor type electric screw rod

Info

Publication number: CN217749839U
Application number: CN202221254317.4U
Authority: CN
Inventors: 罗义; 张烁; 陈亚琴
Original assignee: Shenzhen Sunet Industry Co ltd
Current assignee: Shenzhen Sunet Industry Co ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-11-08
Anticipated expiration: 2032-05-24

Abstract

Electronic lead screw of servo motor formula, including the casing, adorn the servo motor in the casing, its characterized in that: the screw rod in the screw rod nut pair extends outwards or retracts inwards along the axial direction along with the rotation of the output shaft. The utility model discloses with the vice and output shaft combination of screw-nut, simplify the transmission structure of lead screw, reduce load inertia, realize the lead screw linear motion of high acceleration and high frequency, be applicable to the high acceleration of short stroke, high frequency response's application scene, apply to acceleration and response frequency that can effectively improve the focusing motion axle in the laser cutting machine focusing motion, accomplish the focusing action fast, promote cutting accuracy and efficiency.

Description

Servo motor type electric screw rod

Technical Field

The utility model relates to an electronic lead screw of servo motor formula uses in laser cutting machine technical field.

Background

With the increasingly wide application of three-dimensional five-axis cutting, the cutting precision and efficiency are remarkably improved, the response requirement on laser real-time automatic focusing is very high, and the corresponding focusing motion axis needs to pursue extreme acceleration and response frequency so as to quickly complete focusing action and achieve a target. The traditional focusing moving shaft of the laser cutting machine is supported by bearing seats at two ends of a common servo motor, a coupling, a screw rod nut mechanism, a guide device and a screw rod.

The mechanical structure of the driving screw rod motion shaft is complex, the size is large, the inertia of the motion shaft is large, high acceleration and response frequency are difficult to realize, the specification of a servo motor can be increased, and the material cost is overhigh.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic lead screw of servo motor formula, with the vice and output shaft combination of screw-nut, simplify the transmission structure of lead screw, reduce load inertia, realize the lead screw linear motion of high acceleration and high frequency, be applicable to the high acceleration of short stroke, the application scene of high-frequency response, apply to acceleration and response frequency that can effectively improve the focusing motion axle in the laser cutting machine focusing motion, accomplish the focusing action fast, promote cutting accuracy and efficiency.

In order to achieve the purpose, the utility model adopts the technical proposal that:

servo motor formula electric screw rod, including the casing, adorn the servo motor in the casing, its characterized in that: the screw rod nut pair is arranged on an output shaft of the servo motor and extends out of the shell, and a screw rod in the screw rod nut pair axially extends outwards or retracts inwards along with the rotation of the output shaft.

Preferably, the output shaft is of a hollow structure, a nut in the screw-nut pair and the output shaft are coaxially fixed and extend into a middle cavity of the output shaft, and the screw rod is in clearance fit with the middle cavity of the output shaft and extends out of the shell.

Preferably, the nut is T-shaped and fixed with the upper end face of the output shaft, and the upper end face of the nut is separated from the inner wall of the shell and does not contact with the inner wall of the shell.

Preferably, the outer wall of the output shaft is provided with a first annular step surface, the output shaft is sleeved with an angular contact bearing, the lower end face of the angular contact bearing abuts against the first annular step surface, and the upper end face of the angular contact bearing is pressed by the inner wall of the shell.

Preferably, the lower end of the output shaft is sleeved with an encoder shaft sleeve, and an encoder which is in signal connection with the servo motor is assembled on the encoder shaft sleeve.

Preferably, a positioning cover is arranged in the shell, the positioning cover is sleeved outside the output shaft and coaxially fixed with the encoder, and a deep groove ball bearing is pressed between the positioning cover and the output shaft.

Preferably, the outer wall of the output shaft is provided with a second annular step surface located above the encoder shaft sleeve, the inner ring of the deep groove ball bearing is clamped between the second annular positioning surface and the upper end surface of the encoder shaft sleeve, and the lower end surface of the outer ring of the deep groove ball bearing abuts against the positioning cover.

Preferably, the positioning cover and the inner wall of the shell form axial and radial positioning matching.

The utility model has the advantages that:

1. the utility model discloses an electronic lead screw of servo motor formula, the vice dress of screw-nut is on servo motor's output shaft, servo motor output torque drives screw-nut secondary motion, transmission simple structure, torque direct action with servo motor output is vice at screw-nut, convert the linear motion of lead screw into, the output shaft is the vice transmission structure of screw-nut promptly, also be the vice mounting structure of screw-nut, make up screw-nut pair and output shaft, simplify the transmission structure of lead screw, reduce load inertia, realize the lead screw linear motion of high-speed acceleration and high frequency, be applicable to the high acceleration of short stroke, the application scene of high-frequency response, can effectively improve the acceleration and the response frequency of focusing motion axle in applying to laser cutting machine focusing motion, accomplish focusing action fast, promote cutting precision and efficiency.

2. The angular contact bearing is sleeved on the output shaft, rotates along with the rotation of the output shaft, bears the circumferential stress of the output shaft, is axially positioned between the first annular step surface and the inner wall of the shell, bears the axial stress of the output shaft, ensures the rotation smoothness and the axial stability of the output shaft, is pressed between the output shaft and the positioning cover, and radially positions the output shaft, so that the output shaft is prevented from swinging in the rotation process of the lead screw, the structural reliability and the stability are improved, the vibration and the noise of the whole device in the operation process are reduced, and the operation stability is improved.

Drawings

Fig. 1 is a schematic structural diagram of a servo motor type electric screw rod according to an embodiment.

Detailed Description

The following describes an embodiment of the present invention in detail with reference to fig. 1.

Electronic lead screw of servo motor formula, including casing 1, dress servo motor 2 in the casing, its characterized in that: the lead screw nut pair 3 is arranged on an output shaft 4 of the servo motor 2 and extends out of the shell 1, and a lead screw 31 in the lead screw nut pair 3 axially extends outwards or retracts inwards along with the rotation of the output shaft 4.

The servo motor type electric lead screw is characterized in that the lead screw nut pair 3 is arranged on the output shaft 4 of the servo motor 2, the output torque of the servo motor 2 drives the lead screw nut pair 3 to move, the transmission structure is simple, the torque output by the servo motor 2 directly acts on the lead screw nut pair 3 and is converted into the linear motion of the lead screw 31, the output shaft 4 is the transmission structure of the lead screw nut pair 3 and is also the installation structure of the lead screw nut pair 3, the lead screw nut pair 3 and the output shaft 4 are combined, the transmission structure of the lead screw is simplified, the load inertia is reduced, the high-acceleration and high-frequency lead screw linear motion is realized, the servo motor type electric lead screw is suitable for application scenes of short stroke high acceleration and high-frequency response, the acceleration and response frequency of a focusing motion shaft can be effectively improved when the servo motor type electric lead screw is applied to the focusing motion of a laser cutting machine, the focusing action is rapidly completed, and the cutting precision and efficiency are improved.

The output shaft 4 is of a hollow structure, the nut 32 in the feed screw nut pair 3 is coaxially fixed with the output shaft 4 and extends into the middle cavity of the output shaft 4, and the feed screw 31 is in clearance fit with the middle cavity of the output shaft 4 and extends out of the shell 1. The nut 32 and the output shaft 4 rotate synchronously, the output shaft 4 can only rotate but cannot move axially, and the screw rod 31 moves axially when the nut 32 rotates and extends outwards or retracts inwards.

The nut 32 is T-shaped and fixed to the upper end surface of the output shaft 4, and the upper end surface of the nut 32 is spaced from and does not contact the inner wall of the housing 1. The T-shaped nut 32 is convenient to be coaxially fixed with the output shaft 4, the combined structure of the nut-screw pair 3 and the output shaft 4 is simple, and the nut 32 rotates in the shell 1 along with the output shaft 4.

The outer wall of the output shaft 4 is provided with a first annular step surface 41, the output shaft 4 is sleeved with an angular contact bearing 5, the lower end surface of the angular contact bearing 4 abuts against the first annular step surface 41, and the upper end surface is pressed by the inner wall of the shell 1. The output shaft 4 is sleeved with the angular contact bearing 5, the angular contact bearing 5 rotates along with the rotation of the output shaft 4 to bear the circumferential stress of the output shaft, the angular contact bearing 5 is axially positioned between the first annular step surface 41 and the inner wall of the shell 1 to bear the axial stress of the output shaft 4, and the rotation smoothness and the axial stability of the output shaft 4 are guaranteed.

Wherein, the lower extreme suit encoder axle sleeve 6 of output shaft 4, join in marriage on the encoder axle sleeve 6 and join in marriage encoder 7 of joining in marriage with 2 signal connection of servo motor, through encoder 7 control what suit motor 2's output rotational speed with open and stop, realize the high accuracy control to servo motor.

A positioning cover 8 is arranged in the shell 1, the positioning cover 8 is sleeved outside the output shaft 4 and coaxially fixed with the encoder 7, and a deep groove ball bearing 9 is pressed between the positioning cover 8 and the output shaft 4. Deep groove ball bearing 9 is pressed between output shaft 4 and locating cover 8, and deep groove ball bearing 9 radially fixes a position output shaft 4, prevents that lead screw 31 from rotating output shaft 4 swing in-process, improves structural reliability and stability, reduces the vibration and the noise of whole device among the operation process, promotes the stability of operation.

The outer wall of the output shaft 4 is provided with a second annular step surface 42 positioned above the encoder shaft sleeve 6, the inner ring of the deep groove ball bearing 9 is clamped between the second annular positioning surface 42 and the upper end surface of the encoder shaft sleeve 6, the lower end surface of the outer ring of the deep groove ball bearing 9 abuts against the positioning cover 8, the deep groove ball bearing 9 is axially positioned, and the structural stability is improved.

Preferably, the positioning cover 8 is in axial and radial positioning fit with the inner wall of the shell 1. Location lid 8 is by casing inner wall axial and radial positioning, deep groove ball bearing 9 pressure equipment is between location lid 8 and output shaft 4, and the inner circle presss from both sides between two 42 and the up end of encoder axle sleeve 6 of ring locating surface, the terminal surface supports on location lid 8 under the outer lane, make deep groove ball bearing 9 by axial and radial positioning in casing 4, structural stability is high, effectively prevent output shaft 4's swing, casing inside vibration and noise when reducing the operation, structural stability and reliability are improved.

The technical solutions of the embodiments of the present invention are completely described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Claims

1. Servo motor formula electric screw rod, including the casing, adorn the servo motor in the casing, its characterized in that: the screw rod in the screw rod nut pair extends outwards or retracts inwards along the axial direction along with the rotation of the output shaft.

2. The servomotor-type electric screw according to claim 1, wherein: the output shaft is of a hollow structure, a nut in the screw-nut pair and the output shaft are coaxially fixed and extend into a middle cavity of the output shaft, and the screw rod is in clearance fit with the middle cavity of the output shaft and extends out of the shell.

3. The servomotor-type electric screw according to claim 2, wherein: the nut is T-shaped and fixed with the upper end face of the output shaft, and the upper end face of the nut is separated from the inner wall of the shell and does not contact with the inner wall of the shell.

4. A servomotor-type electric screw according to claim 2, wherein: the outer wall of the output shaft is provided with a first annular step surface, the output shaft is sleeved with an angular contact bearing, the lower end face of the angular contact bearing abuts against the first annular step surface, and the upper end face of the angular contact bearing is tightly pressed by the inner wall of the shell.

5. The servomotor-type electric screw according to claim 2, wherein: the lower end of the output shaft is sleeved with an encoder shaft sleeve, and an encoder which is in signal connection with the servo motor is assembled on the encoder shaft sleeve.

6. The servomotor-type electric screw according to claim 5, wherein: a positioning cover is arranged in the shell, the positioning cover is sleeved outside the output shaft and coaxially fixed with the encoder, and a deep groove ball bearing is pressed between the positioning cover and the output shaft.

7. The servomotor-type electric screw according to claim 6, wherein: and the outer wall of the output shaft is provided with a second annular step surface positioned above the encoder shaft sleeve, the inner ring of the deep groove ball bearing is clamped between the second annular positioning surface and the upper end surface of the encoder shaft sleeve, and the lower end surface of the outer ring of the deep groove ball bearing abuts against the positioning cover.

8. The servomotor-type electric screw according to claim 7, wherein: the positioning cover and the inner wall of the shell form axial and radial positioning matching.