JP3243291U - Motorized lead screw structure with improved structure - Google Patents

Abstract

A motorized lead screw structure with improved impact resistance, effectively improved stability during the reciprocating motion process, compact and stable overall structure, and high operational reliability. The present invention is a structurally improved electric lead screw structure comprising a casing, a slide rod, a drive motor, a lead screw and a mounting plate. A housing cavity and a slideway are provided within the casing, the drive motor is disposed within the housing cavity, an opening is provided at one end of the casing for the output shaft of the drive motor to protrude, and the lead screw extends through the opening. It is put in the output shaft of the drive motor, the slide rod slides in the slideway, and one end of the casing is provided with a slide port for projecting the slide rod, and projects from the casing of the slide rod and the lead screw. The end is connected to one side of the mounting plate, the slide rod exerts good guiding ability, and the slide rod and the mounting plate cooperate. [Selection drawing] Fig. 2

Description

TECHNICAL FIELD The present invention relates to the technical field of motorized lead screw structure, and more particularly to a motorized lead screw structure with improved structure.

With the development of society, the research and application of motors have been further improved, and lead screw motors have the characteristic of converting the rotary motion of the motor into linear motion, and have good development and application in the manufacturing of machine tools. can be
In the prior art, Patent Document 1 discloses a servo-motorized electric lead screw structure, in the above structure, the screw nut is placed in the casing, the rotating shaft of the motor is provided with a cavity, and the motor is started After that, the rotation of the rotating shaft causes the lead screw to reciprocate and expand in the cavity. It was found that it is difficult to maintain concentricity because the lead screw tends to shift when it is connected with a nut and the rod part of the lead screw hits it. In order to solve the above problems, there has been a demand for an electric lead screw structure with a more rational structure.

Chinese Utility Model Application No. CN217749839U

The present invention solves the technical problem that the lead screw in the prior art lacks a protective structure during the expansion and contraction process of the rotating shaft, resulting in poor connection stability between the rotating shaft and the lead screw, making it difficult to install external parts. Focus on and provide new solutions.

To achieve the above objectives, the present invention provides an electric lead screw structure with improved structure,
a casing having a housing cavity and a slideway therein;
a drive motor disposed within the housing cavity and having an output shaft exposed through an opening provided at one end of the casing;
a lead screw inserted into the output shaft through the opening;
a slide rod disposed in the slideway and protruding from a slide opening provided at one end of the casing;
a mounting plate in which the ends protruding from the casing of the slide rod and the lead screw are connected to one surface of the mounting plate and the other surface of the mounting plate is provided with a plurality of mounting holes; improved motorized lead-screw construction.

In a further improved form of the present invention, the drive motor comprises a hollow rotor and a screw nut, one end of the rotor is connected with the main control board, the other end is provided with a nut socket, and the screw nut is assembled in the nut socket and fitted over the rod of the lead screw, the cavity receiving the lead screw.

In a further improved form of the invention, a rotary bearing is also provided between the main control board and the rotor, and the rotary bearing is fitted on the cylindrical surface of the rotor to drive the rotor.

In a further improved form of the invention, a connecting seat is also provided between the rotary bearing and the main control board, and the edge of the connecting seat is also provided with a notched structure.

In a further improved form of the present invention, a magnetic cylinder structure is further installed outside the rotor, a stator structure is further installed at a position corresponding to the magnetic cylinder structure in the casing, and the stator structure is electrically connected to the main control board. connected to

In a further refinement of the invention, the drive motor further comprises a plurality of sets of bearing structures, the outer sides of which are fixed to the profile of the casing and the inner sides which fit over the nut sockets.

In a further improved form of the present invention, a plurality of sets of grooves are further provided in the circumferential direction of the nut socket, and the groove bottoms of the grooves are closely attached to the inner side of the bearing structure.

In a further improved form of the invention, a threaded structure is further provided inside the opening, and a threaded cap matching the threaded structure is also provided, with a protrusion for projecting the lead screw structure in the center of the threaded cap. A hole is provided.

In a further refinement of the invention, the diameter of the end face of the opening is the same as the outer diameter of the bearing structure and the side of the screw-on cap closer to the rotor abuts the outer bearing structure.

In a further improved form of the invention, a socket structure is provided in the slideway, the length of the socket structure is shorter than the length of the slideway, the socket structure is fitted onto the cylindrical surface of the slide rod, An end of the slide rod remote from the mounting plate is provided with a locking piece structure that abuts against the outer end surface of the socket structure.

Compared with the prior art, the structure-improved electric lead screw structure provided by the present invention comprises a casing, a slide rod, a drive motor, a lead screw and a mounting plate, and is housed in a cavity in the casing. The drive motor is disposed within the housing cavity, one end of the casing is provided with an opening for the output shaft of the drive motor to protrude, and the lead screw extends from the opening to the output shaft of the drive motor. The slide rod slides in the slideway, one end of the casing is provided with a slide opening for projecting the slide rod, and the ends of the slide rod and the lead screw projecting from the casing are attached to the mounting plate. and a plurality of assembly holes are provided on the other surface of the mounting plate. The rotation of the driving motor causes the lead screw to reciprocate and retract. During the extension and retraction process, on the one hand, the slide rods on both sides have good guiding ability, and on the other hand, the lead screw and the slide rod are connected to the mounting plate, and the slide rod and the mounting plate improve the impact resistance of the lead screw and effectively improve the stability during the reciprocating motion process of the lead screw. provided, the overall structure is compact and stable, and the operation reliability is high.

1 is a three-dimensional view of the present invention; FIG. 1 is an exploded view of the present invention; FIG. FIG. 2 is an exploded view showing the structure of the drive motor and lead screw of the present invention; 1 is a cross-sectional view of the present invention; FIG.

In order to explain the present invention more clearly, the present invention will now be further described with reference to the accompanying drawings.

In the following, the present invention will be described in detail with examples for better understanding. It should be understood that the described embodiments are some, but not all embodiments of the present invention. It will be understood that the specific examples are used only to interpret the invention and are not intended to limit the invention.

As used herein, the terms “include” and/or “comprise” designate the presence of the stated feature, whole, step, operation, element, and/or assembly, but not one or more other It will be understood that it does not exclude the presence or addition of features, wholes, steps, operations, elements, assemblies, and/or combinations thereof.

1 to 4, the structure-improved electric lead screw structure provided by the present invention comprises a casing 1, a slide rod 4, a drive motor 2, a lead screw 3 and a mounting plate 5. A housing cavity 11 and a slideway 12 are provided in the casing 1 , the driving motor 2 is disposed in the housing cavity 11 , and an opening for protruding the output shaft of the driving motor 2 at one end of the casing 1 . 111 is provided, the lead screw 3 is put into the output shaft of the drive motor 2 through the opening 111, and the slide rod 4 slides in the slideway 12 to protrude the slide rod 4 at one end of the casing 1. , and the ends of the slide rod 4 and the lead screw 3 protruding from the casing 1 are connected to one surface of the mounting plate 5, and the other surface of the mounting plate 5 has a plurality of assembly holes 51. is provided. The rotation of the drive motor 2 causes the lead screw 3 to reciprocate and expand. The slide rod 4 and the mounting plate 5 cooperate to enhance the impact resistance of the lead screw 3 and effectively improve the stability of the lead screw 3 during the reciprocating motion process. An assembly hole 51 is provided for convenient attachment to equipment, the overall structure is compact and stable, and the reliability of operation is high.

In order to further optimize the rationality of the transmission structure of the driving motor, in this embodiment, the driving motor 2 comprises a hollow rotor 21 and a screw nut 22. One end of the rotor 21 is connected to a main control board 26. A nut socket 23 is provided at the other end, a screw nut 22 is assembled in the nut socket 23 and fitted onto the rod of the lead screw 3 , and the cavity accommodates the lead screw 3 . The main control board 26 is equipped with coding components such as an encoding disk, a coding chip, and a PCB board board, and is used to control the rotation speed and rotation direction of the rotor 21 and convert it into a required round trip distance. The screw nut 22 chooses a ball screw nut, the outside is fixed in the nut socket 23, and under the drive of magnetic force, the outside of the screw nut 22 and the nut socket 23 remain stationary and follow the rotor 21. , the lead screw 3 can be reciprocated and retracted. During the extension and retraction of the lead screw 3, the fixed mounting plate 5 is reciprocated. Since the rotor 21 and the lead screw 3 can be connected without using a coupling, the product cost is reduced, and there is no fear of insufficient concentricity due to insufficient precision of the coupling.

In order to further ensure the transmission stability between the main control board 26 and the rotor 21, in this embodiment, a rotary bearing 27 is also provided between the main control board 26 and the rotor 21, and the rotary bearing 27 is located on the rotor 21. is fitted into the cylindrical surface of the The role of the rotary bearing 27 is, on the one hand, to stably assemble the end of the rotor 21 near the main control board 26 to ensure concentricity; and improve the stability of operation.

In a further embodiment, a coupling seat 28 is also provided between the rotary bearing 27 and the main control board 26, the coupling seat 28 being used to connect the main control board 26 and the rotary bearing 27, and the main control It is convenient to partially disassemble, inspect, and maintain the substrate 26 and the rotary bearing 27 separately. In a more preferred embodiment, the edge of the connecting seat 28 is also provided with a cutout structure, which facilitates the arrangement of the wires on the mounting plate 5, allowing the wires to be stored or pulled out at desired positions. can be done.

More specifically, a magnetic cylinder structure 24 is further installed outside the rotor 21, and a stator structure (not shown) is further installed at a position corresponding to the magnetic cylinder structure 24 in the casing 1. The stator structure is mainly It is electrically connected to the control board 26 . The main control board 26 is encrypted by the operator, the power command is input, the stator structure provides the magnetic force, the magnetic cylinder structure 24 rotates the rotor 21, and the rotation of the rotor 21 causes the first end of the lead screw 3 to rotate. is reciprocable within the cavity and the second end exerts a pushing and pulling force on the mounting plate 5 .

In order to further enhance the structural rationality of the rotation of the rotor 21, in this embodiment, the drive motor 2 further comprises a plurality of sets of bearing structures 25, the outer side of the bearing structures 25 being fixed to the profile of the casing 1, and the inner side fits over the nut socket 23 . On the one hand, the bearing structure 25 is fitted into the cylindrical surface of the nut socket 23 to achieve the overall support of the rotor 21, so that the rotor 21 can be stably assembled in the casing 1 without misalignment of the parts, and the rotor 21 and the lead screw 3 to ensure the smoothness of the rotor 21. More preferably, the bearing structure 25 adopts ball bearings to further increase the smoothness of the reciprocating motion. .

In order to make the overall structure more compact, in this embodiment, a plurality of sets of grooves 231 are further provided in the circumferential direction of the nut socket 23 , and the groove bottoms of the grooves 231 are closely attached to the inner side of the bearing structure 25 . . By providing the concave groove 231 , not only is the stability of assembly further improved, but also the concentricity can be maintained better, and the convex ring formed by the concave groove 231 can be closely attached to the bearing connection structure 25 . It is possible to understand that it is convenient to install,
In a more preferred embodiment, first tightening holes are also provided between the sets of grooves 231, and the screw nut 22 is provided with second tightening holes that match the first tightening holes. A fixing pin is assembled in the hole and the second tightening hole. Both the screw nut 22 and the nut socket 23 are provided with corresponding holes and fixed with fixing bolts, so that no rotational speed difference is formed between the screw nut 22 and the rotor 21, and the screw nut 22 and the rotor 21 to increase the fitting stability.

In order to prevent the performance from being adversely affected by dust entering the interior of the casing 1 during the rotation process, in this embodiment, a screw structure is further provided inside the opening 111, and a screw-in type housing adapted to the screw structure is provided. A cap 14 is also provided and a protruding hole 141 is provided in the center of the screw-on cap 14 for protruding the lead screw 3 . A screw-on cap 14 seals the casing 1 and further ensures the stability of the lead screw 3 and drive motor 2 .

In a more preferred embodiment, the diameter of the end face of the opening 111 is the same as the outer diameter of the bearing structure 25 and the side of the screw-on cap 14 closer to the rotor 21 abuts the outer bearing structure 25 . The screw-on cap 14 correspondingly covers the opening 111 and presses against one side of the bearing structure 25 through the screw-on cap 14, and the convex ring formed by the concave groove 231 provides a support point for tightening the structure. to be more compact.

In order to cope with various usage environments, it is necessary to protect the outer part of the lead screw 3 from dust. and therefore, in this embodiment, a telescoping screw which is fitted over the lead screw 3 and whose first end is rigidly attached to the mounting plate 5 and whose second end is rigidly attached to the surface of the screw-on cap 14 remote from the rotor 21 . A dust cap 6 is further provided. The center of the extendable dust cap 6 can be freely extended and retracted to cover the lead screw 3 and prevent dust from entering.

In a specific embodiment, the entire telescoping dust cap 6 presents a frusto-conical shape and is composed of multiple expansion joints connected back and forth, any expansion joint following the retraction of the lead screw 3. and is housed within the adjacent expansion joint. The most distal expansion joint has the largest volume and can accommodate all the expansion joints except itself without affecting the expansion and contraction performance of the lead screw 3, making the whole structure more compact. It finds application in industries with high volume requirements (such as laser cutting and robotics).

In this embodiment, a socket structure 13 is provided in the slideway 12, the length of the socket structure 13 is shorter than the length of the slideway 12, and the socket structure 13 is fitted on the cylindrical surface of the slide rod 4 and slides. A locking piece structure 41 abutting against the outer end surface of the socket structure 13 is provided at the end of the rod 4 remote from the mounting plate 5 . The inner wall of the socket structure 13 is in close contact with the outer wall of the cylindrical surface of the slide rod 4 to realize sliding contact, and when the lead screw 3 retreats in the direction of the casing 1, the first end of the lead screw 3 is accommodated in the rotor 21. When the first end of the slide rod 4 slides into the slideway 12 and the lead screw 3 protrudes away from the casing 1 , most of the rod portion of the lead screw 3 protrudes out of the cavity of the rotor 21 . When the post main body portion on the side of the slide rod 4 slides from the slideway 12 into the socket structure 13 and reaches the limit position, the locking piece structure 41 at one end of the slide rod 4 comes into contact with the outer end surface of the socket structure 13. contact, limit the protrusion distance of the lead screw 3 and the slide rod 4, the slide rod 4 cooperates with the lead screw 3, the expansion and contraction process is smooth and reasonable, the concentricity is maintained, the core of the electric lead screw structure It can be understood that the operational stability of the transmission parts is enhanced. In a more preferred embodiment, the end of the slideway 12 remote from the socket structure 13 is also provided with a washer structure, which is used to cushion the locking piece structure 41 and further increase stability during operation. be done.

Advantages of the present invention include:
1) The rotor and screw nut of the drive motor can form a good fitting structure form, realizing synchronous rotation between the rotor and nut, reducing the error, improving the accuracy, and controlling the force. Useful and suitable for the field of high-precision positioning,
2) The main body of the drive motor is rationally assembled through the casing, giving the product the characteristic of compact structure.

1 Casing 11 Housing cavity 111 Opening 12 Slideway 121 Slide opening 13 Socket structure 14 Threaded cap 141 Protruding hole 2 Drive motor 21 Rotor 22 Screw nut 23 Nut socket 231 Groove 24 Magnetic cylinder structure 25 Bearing structure 26 Main Control board 27 Rotational bearing 28 Connecting seat 3 Lead screw 4 Slide rod 41 Lock piece structure 5 Mounting plate 51 Assembly hole 6 Telescopic dust cap

Claims (10)

A structurally improved motorized lead screw structure comprising:
a casing having a housing cavity and a slideway therein;
a drive motor disposed within the housing cavity and having an output shaft exposed through an opening provided at one end of the casing;
a lead screw inserted into the output shaft through the opening;
a slide rod disposed in the slideway and protruding from a slide opening provided at one end of the casing;
and a mounting plate in which ends of the slide rod and the lead screw protruding from the casing are connected to one surface of a mounting plate, and the other surface of the mounting plate is provided with a plurality of mounting holes. Motorized lead screw structure with improved structure. The drive motor includes a rotor with a cavity and a screw nut, one end of the rotor is connected to the main control board, the other end is provided with a nut socket, and the screw nut is assembled in the nut socket. 2. The structurally improved motorized lead screw structure of claim 1, wherein a lead screw is mounted on a rod of said lead screw, said cavity accommodating said lead screw. A rotation bearing is also provided between the main control board and the rotor, and the rotation bearing is fitted in the cylindrical surface of the rotor to drive the rotor. Motorized lead screw structure with improved structure. The structure according to claim 3 is improved, characterized in that a connecting seat is also provided between the rotary bearing and the main control board, and a notch structure is also provided on the edge of the connecting seat. Motorized leadscrew construction. A magnetic cylinder structure is further installed outside the rotor, and a stator structure is further installed in the casing at a position corresponding to the magnetic cylinder structure, and the stator structure is electrically connected to the main control board. The electric lead screw structure with improved structure according to claim 4, characterized in that: 5. The drive motor according to claim 4, further comprising a plurality of sets of bearing structures, wherein the outer side of the bearing structure is fixed to the profile of the casing and the inner side fits the nut socket. Motorized lead screw structure with improved structure. The improved structure according to claim 6, characterized in that a plurality of sets of grooves are further provided in the circumferential direction of the nut socket, and groove bottoms of the grooves are closely attached to the inside of the bearing structure. Motorized leadscrew construction. A screw structure is further provided inside the opening, and a screw-type cap matching the screw structure is also provided, and a projection hole for projecting the lead screw is provided in the center of the screw-type cap. A motorized lead screw structure with improved structure according to claim 6, wherein: 9. A structure according to claim 8, characterized in that the diameter of the opening end face is the same as the outer diameter of the bearing structure and the side of the screw-on cap closer to the rotor abuts the outer bearing structure. improved motorized lead-screw construction. The socket structure is provided in the slideway, the length of the socket structure is shorter than the length of the slideway, the socket structure is fitted on the cylindrical surface of the slide rod, and either the slide rod 2. The electric lead screw structure with improved structure according to claim 1, wherein a locking piece structure abutting against the outer end surface of said socket structure is provided at the end remote from said mounting plate.