CN211791095U

CN211791095U - Electric push rod

Info

Publication number: CN211791095U
Application number: CN202020869509.0U
Authority: CN
Inventors: 周世祥
Original assignee: Linac Transmission System Shenzhen Co ltd
Current assignee: Linac Transmission System Shenzhen Co ltd; Linak Shenzhen Actuator System Ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2020-10-27
Anticipated expiration: 2030-05-21

Abstract

The utility model relates to an electric putter, include: a housing comprising a sidewall; an outer tube connected in the housing; an inner tube disposed within the outer tube; a screw spindle extending within the inner tube; the main shaft nut is meshed with the screw main shaft and is connected with the inner pipe; a motor installed outside the housing; the transmission device is connected with the screw spindle to convert the rotary motion of the motor into linear reciprocating motion of the spindle nut and the inner pipe guided by the outer pipe; a printed circuit board assembly mounted in the housing; the printed circuit board assembly is characterized in that the printed circuit board assembly is provided with a motor connector, the motor is provided with a motor terminal protruding from one side of the motor shell, and the motor terminal is directly inserted into the motor connector.

Description

Electric push rod

Technical Field

The utility model relates to an electric putter.

Background

An electric push rod, also called a linear actuator, is a driving device that converts a rotary motion into a linear reciprocating motion. The electric push rod can be applied to various environments such as hospitals, offices, factories, families and the like, and is used for moving heavy objects such as beds, tables, chairs, medical equipment, industrial machinery and the like in a push-pull, lifting, tilting and the like manner.

Generally, the electric push rod mainly includes a motor, a screw, a nut, a transmission, a brake, and the like. In addition, the power putter further includes a printed circuit board assembly including a printed circuit board and various electronic devices mounted on the printed circuit board for controlling the motor.

In the prior art, the connection between the printed circuit board assembly and the motor is mainly by soldering the motor leads to the printed circuit board. Alternatively, the motor leads are terminated and the motor lead terminals are then inserted into connectors on the printed circuit board assembly.

The above prior art has a disadvantage in that the motor lead may be caught during the assembly process due to the motor lead. In addition, the assembly process is complicated, which may lead to other undesirable consequences.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric putter can solve the above-mentioned problem that exists among the prior art.

According to the utility model discloses, an electric putter is provided, include: a housing comprising a sidewall; an outer tube connected in the housing; an inner tube disposed within the outer tube; a screw spindle extending within the inner tube; the main shaft nut is meshed with the screw main shaft and is connected with the inner pipe; a motor having a housing and mounted outside the housing; the transmission device is connected with the screw spindle to convert the rotary motion of the motor into linear reciprocating motion of the spindle nut and the inner pipe guided by the outer pipe; a printed circuit board assembly mounted in the housing; the printed circuit board assembly is characterized in that the printed circuit board assembly is provided with a motor connector, the motor is provided with a motor terminal protruding from one side of the motor shell, and the motor terminal is directly inserted into the motor connector.

According to an embodiment, the printed circuit board assembly is arranged in the housing on an outer side of the outer tube, adjacent to a side wall of the housing, and parallel to an axial direction of the outer tube.

According to an embodiment, the housing further comprises a card slot, and the longitudinal end of the printed circuit board assembly is inserted into the card slot in the housing so as to fix the printed circuit board assembly in both the axial direction and the transverse direction.

According to one embodiment, the motor connector of the printed circuit board assembly is a collet-type connector and the motor terminals are flat and the motor terminals are engaged in the collets of the motor connector.

According to an embodiment, the motor connector is a collet capable of being elastically deformed when the motor terminal is inserted, and clamping the motor terminal by an elastic force after the motor terminal is inserted in place to fix the motor terminal enough to ensure electrical connection.

According to one embodiment, the collet of the motor connector has two opposing bent portions having resilient arms defining a gap therebetween for insertion of the motor terminals.

According to one embodiment, the printed circuit board assembly further has a grounding device that abuts a portion of the motor when the motor is mounted to the housing of the power putter.

According to an embodiment, the grounding device is a spring-type grounding connector.

According to an embodiment, the grounding means is a soldered copper contact.

According to the utility model discloses an electric putter can save spare part, simplifies assembly process, improves electric putter operating stability.

Drawings

Objects, features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description of the embodiments with reference to the accompanying drawings. Furthermore, the various elements of the drawings are not necessarily to scale; on the contrary, the dimensions of the various elements in the figures may be exaggerated or minimized as appropriate to more clearly illustrate the embodiments of the present invention.

The invention is further described with reference to the drawings and examples, in which like reference numerals refer to like elements.

Fig. 1 is a front view of the electric putter of the present invention, showing the appearance of the electric putter.

Fig. 2 is a plan view of the electric putter of fig. 1.

Fig. 3 is a right side view of the power putter of fig. 1.

Fig. 4 is an exploded view schematically showing the electric putter of the present invention, with some parts omitted.

Fig. 5 is an assembled top view of the power putter of fig. 4.

Fig. 6 is a sectional view taken along line a-a of fig. 5.

Detailed Description

The terms used herein should be understood and interpreted to have a meaning consistent with their understanding by those skilled in the art, rather than a specific definition that is different from the ordinary meaning as understood by those skilled in the art. Specific definitions will be explicitly indicated in the specification.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the size, material, shape, relative arrangement relationship, and the like of the constituent elements described in the embodiments may be appropriately changed according to the configuration, various conditions, and the like of the apparatus to which the present invention is applied. Therefore, the sizes, materials, shapes, relative arrangement relationships, and the like of the constituent elements described in the embodiments are not intended to limit the scope of the present invention to the following embodiments.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating relative importance or as indicating a number of technical features.

As shown in fig. 1, 2 and 3, the electric putter of the present invention includes a housing 2, and the housing 2 may be made of plastic. An outer tube 8 is attached in the housing 2, the outer tube 8 being extendable out of the housing 2. The inner tube 9 is telescopically guided by the outer tube 8 along a longitudinal axis within the outer tube 8. One end of the outer tube 8 may comprise a bushing for guiding the inner tube 9. Further, a rear mounting 10 is provided at the rear end of the housing 2 and a front mounting 11 is provided at the front end of the inner tube 9 to facilitate mounting of the power putter in use.

The electric putter comprises a motor 3, for example a reversible motor, and may be a direct current motor or an alternating current motor. The motor 3 is arranged at the bottom of the shell 2, and the axial direction of an output shaft of the motor 3 is vertical to the longitudinal axis of the shell 2.

The electric push rod further comprises a spindle of a screw extending inside the inner tube 9. The transmission device of the electric push rod is connected with the main shaft of the screw rod. The transmission may employ transmissions known in the art, such as worm and worm gear transmissions, gear train transmissions, rack and pinion transmissions, and the like.

A spindle nut (not shown) is arranged inside the outer tube 8, having an internal thread to mesh with the external thread of the spindle of the screw. The rear end of the inner tube 9 is fastened to the spindle nut, for example by means of threads or other fastening means. The spindle nut is fixed against rotation relative to the spindle of the screw, the outer tube 8 and the inner tube 9.

Thus, after the motor 3 is started, the transmission device drives the screw spindle to rotate under the drive of the output shaft of the motor 3, the rotation motion of the screw spindle is converted into the linear motion of the spindle nut guided by the outer tube 8 in the outer tube 8, and the inner tube 9 and the spindle nut perform linear telescopic motion along the longitudinal axis in the outer tube 8 together. When the motor 3 rotates forwards, the inner pipe 9 extends forwards; when the motor 3 is reversed, the inner tube 9 is retracted rearward.

As shown in fig. 4, 5, and 6, the power putter further includes a printed circuit board assembly 1. The printed circuit board assembly includes a printed circuit board and various electronic devices mounted on the printed circuit board.

The printed circuit board includes a board made of an electrically insulating material, a surface of which is formed with a printed circuit. The plate of electrically insulating material may for example be made of a polymer, glass/epoxy or ceramic material. The printed circuit serves as an electrical connection to connect several electronic devices mounted on one or both sides of the printed circuit board to establish the desired electrical circuit. Various electronic devices may be mounted on the surface of a printed circuit board using surface mount technology and soldered directly to a copper plated conductive surface or other conductive surface of the printed circuit board.

Currently, a multilayer printed circuit board including an insulating layer and a conductive circuit is widely used. Vias may be used to create connections between different layers of circuitry. Thus, there is no insulating layer in the via. Alternatively, an insulating interlayer with vias may be used to achieve the desired connection.

According to the utility model discloses, be equipped with the sensing device who is used for confirming 9 positions of inner tube on the printed circuit board. The position of the inner tube 9 can be determined, for example, by hall elements arranged on a printed circuit board. Alternatively, instead of hall sensors, potentiometers may be provided to determine the absolute position of the inner tube 9.

As an alternative to the above-described sensing device, the printed circuit board may have a first limit switch and a second limit switch mounted thereon. When the inner tube 9 is fully retracted within the outer tube 8, the spindle nut hits a rear stop within the outer tube 8, thereby pushing the outer tube 8 into the housing 2 of the electric putter; at this time, the outer tube 8 triggers the first limit switch, thereby cutting off the power supply to the motor 3. When the inner tube 9 is linearly moved outward inside the outer tube 8, the outer tube 8 returns to the initial position; when the spindle nut is advanced to the front limit position, the spindle nut hits a front limit part in the outer tube 8, thereby pulling the outer tube 8 outward; at this point, the outer tube 8 triggers the second limit switch, thereby cutting off power to the motor 3.

In addition, electronic devices such as a CPU, a transistor, and a capacitor may be mounted on the printed circuit board.

According to the present invention, the printed circuit board assembly 1 is arranged in the housing 2 at the outer side of the outer tube 8, adjacent to the side wall of the housing 2, and arranged parallel to the axial direction of the outer tube 8. The longitudinal ends of the printed circuit board assembly 1 are inserted into card slots in the housing 2. In this way, the printed circuit board assembly 1 is fixed both in the axial direction and in the transverse direction.

The printed circuit board assembly 1 also has a motor connector 4 for connection to a motor terminal 7 of the motor 3 for controlling the current on and off of the motor. The motor terminals 7 protrude from one end of the motor housing and extend into the housing 2 after the motor 3 is mounted to the power putter housing 2 without motor leads so that the motor terminals are directly inserted into the motor connector 4 of the printed circuit board assembly 1. The number of motor connectors 4 is not limited to the two shown in the figures, but may vary according to specific needs; also, the number of motor terminals 7 is not limited to two as shown in the drawing, but may also be varied according to specific needs. In this way, the motor terminal 7 itself serves as both the mechanical connector and the electrical connector, and the motor connector 4 itself of the printed circuit board assembly also serves as both the mechanical connector and the electrical connector.

As shown in fig. 6, the motor connector 4 of the printed circuit board assembly 1 is a collet-type connector, and the flat motor terminal 7 is engaged in the collet of the motor connector 4. In this case, the motor connector 4 is an elastic collet capable of being elastically deformed at the time of insertion of the motor terminal 7 to facilitate the insertion of the motor terminal 7, and clamping the motor terminal 7 by an elastic force after the insertion of the motor terminal 7 in place to fix the motor terminal 7 sufficiently to ensure the electrical connection.

Further, as shown in fig. 6, the collet of the motor connector 4 has two opposing bent portions having resilient arms defining a gap therebetween for insertion of the motor terminal 7.

Although the above embodiments describe the engagement clamping manner of the chuck type motor connector 4 and the flat motor terminal 7, those skilled in the art may make various modifications, such as a snap connection, a bayonet connection, etc., on the basis of the above embodiments.

As shown in fig. 6, the printed circuit board assembly 1 also has a ground contact 5 as a grounding means. When the motor 3 is mounted on the electric putter housing 2, the grounding contact 5 abuts the bearing cup 6 of the motor output shaft to ensure good grounding of the printed circuit board assembly 1. In this case, the ground contact 5 may be, for example, a copper contact soldered on the printed circuit board assembly 1.

As an alternative to the above-described ground contact, a ground connector provided on the printed circuit board assembly 1 may also be employed. In this case, the ground connector may be a spring capable of elastically abutting against the end cap of the motor 3.

However, the present invention is not limited to the above-described soldered copper ground contact or spring-type ground connector, and may take other forms known to those skilled in the art.

By the above manner, the motor lead does not need to be soldered to the printed circuit board, and the motor terminal does not need to be connected to the motor lead. Therefore, parts can be saved, the assembly process is simple and convenient, and the running stability of the electric push rod is improved.

The particular features, structures, materials, or characteristics described above may be combined in any suitable manner in this specification.

While the present invention has been described with reference to the above exemplary embodiments, it will be understood by those skilled in the art that various modifications may be made to the specific embodiments disclosed above, and the present invention is not limited to the above exemplary embodiments. The scope of the claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. An electric putter comprising:

a housing comprising a sidewall;

an outer tube connected in the housing;

an inner tube disposed within the outer tube;

a screw spindle extending within the inner tube;

the main shaft nut is meshed with the screw main shaft and is connected with the inner pipe;

a motor having a housing and mounted outside the housing;

the transmission device is connected with the screw spindle to convert the rotary motion of the motor into linear reciprocating motion of the spindle nut and the inner pipe guided by the outer pipe;

a printed circuit board assembly mounted in the housing;

it is characterized in that the preparation method is characterized in that,

the printed circuit board assembly has a motor connector, and the motor has a motor terminal protruding from one side of the motor housing, the motor terminal being directly inserted into the motor connector.

2. The power putter of claim 1, wherein the printed circuit board assembly is disposed in the housing on an outer side of the outer tube adjacent a side wall of the housing and parallel to an axial direction of the outer tube.

3. The power putter of claim 1, wherein the housing further comprises a locking groove, and the longitudinal end of the printed circuit board assembly is inserted into the locking groove in the housing so that the printed circuit board assembly is fixed in both the axial and lateral directions.

4. The power putter of claim 1 wherein the motor connector of the printed circuit board assembly is a collet-type connector and the motor terminals are flat and the motor terminals are engaged in the collet of the motor connector.

5. The power putter of claim 4, wherein the motor connector is a collet capable of being elastically deformed when the motor terminal is inserted and clamping the motor terminal by an elastic force after the motor terminal is inserted in place to fix the motor terminal enough to ensure the electrical connection.

6. The power putter of claim 5, wherein the collet of the motor connector has two opposing bends with resilient arms defining a gap therebetween for insertion of the motor terminals.

7. The power putter of claim 1, wherein the printed circuit board assembly further includes a grounding means for abutting a portion of the motor when the motor is mounted to the housing of the power putter.

8. The power putter of claim 7, wherein the grounding means is a spring-loaded grounding connector.

9. The power putter of claim 7, wherein the grounding means is a soldered copper contact.