Linear actuator
阅读说明:本技术 线性致动器 (Linear actuator ) 是由 M·K·克努森 H·斯科比 R·索伦森 于 2018-06-28 设计创作,主要内容包括:本发明涉及线性致动器,包括控制台、连接至控制台的外管、电机、传动装置以及与传动装置连接的主轴。线性致动器包括主轴上的主轴螺母和连接到主轴螺母的内管。主轴螺母和内管在外管内部受引导。线性致动器包括控制盒,控制盒通过卡扣连接而连接到控制台。线性致动器还包括端部止动装置,端部止动装置具有用于主轴螺母每个移动方向的端部开关。本发明的目的是提供控制盒到线性致动器的更简单连接。另一目的是提供线性致动器端部止动装置的较简单构造。为此,控制盒通过卡扣连接而连接到控制台。此外,线性致动器包括布置在主轴螺母与端部开关之间的滑动元件,并且滑动元件由主轴螺母致动。(The invention relates to a linear actuator comprising a console, an outer tube connected to the console, a motor, a transmission and a spindle connected to the transmission. The linear actuator includes a spindle nut on the spindle and an inner tube connected to the spindle nut. The spindle nut and the inner tube are guided inside the outer tube. The linear actuator comprises a control box which is connected to the console by a snap connection. The linear actuator further comprises an end stop with an end switch for each direction of movement of the spindle nut. It is an object of the invention to provide a simpler connection of a control box to a linear actuator. Another object is to provide a simpler construction of the linear actuator end stop arrangement. For this purpose, the control box is connected to the console by a snap connection. Furthermore, the linear actuator comprises a sliding element arranged between the spindle nut and the end switch, and the sliding element is actuated by the spindle nut.)
1. Linear actuator (1) comprising a console (2), an outer tube (3) connected to the console (2), a motor (7), a transmission (14) and a spindle (13) connected to the motor (7) via the transmission (14), a spindle nut (16) on the spindle (13), an inner tube (4) connected to the spindle nut (16), wherein the spindle nut (16) and the inner tube (4) are guided inside the outer tube (3) and move along the longitudinal axis of the spindle (13) in or out of the outer tube (3) depending on the direction of rotation of the motor (7), and wherein the linear actuator comprises a control box (20), characterized in that the control box (20) is connected to the console (2) by a snap connection (35, 36).
2. Linear actuator according to claim 1, characterized in that the control box (20) comprises a hook (9) and the console (2) comprises a counterpart (10) of the hook (9), and the hook (9) and the counterpart (10) of the hook (9) constitute a snap connection.
3. Linear actuator according to claim 2, characterized in that the hook (9) is elastic.
4. Linear actuator according to claim 2, characterized in that the counterpart (10) of the hook (9) is a hole in the front end (18) of the console (2).
5. Linear actuator according to one or more of claims 1 to 4, characterized in that the snap connection is releasable.
6. Linear actuator according to claim 1, characterized in that the linear actuator (1) comprises an end stop with an end switch (21, 22) for each direction of movement of the spindle nut (16), and the linear actuator (1) comprises a sliding element (27) arranged between the spindle nut (16) and the end switch (6, 7), and the sliding element (27) is actuated by the spindle nut (16).
7. Linear actuator according to claim 6, characterized in that the sliding element (27) is arranged inside the console (2).
8. Linear actuator according to claim 6 or 7, characterized in that the sliding element (27) is moved by the spindle nut (16) in a first direction in a predetermined first end section of the stroke length and in a second direction opposite to the first direction in a predetermined second end section of the stroke length.
9. Linear actuator according to any of claims 6 to 8, characterized in that the linear actuator (1) comprises a control box (20) connected to the console (2) and in that the end switches (21, 22) are arranged in the control box (20).
10. Linear actuator according to any of claims 6 to 9, characterized in that the sliding element (27) comprises a pin (31) protruding outside the console (2).
11. Linear actuator according to claim 10, characterized in that the actuating element (28) is arranged inside the outer tube (3) and the sliding portion (32) is arranged outside the outer tube (3), and the pin (31) is arranged on the sliding portion (32), and the sliding portion (32) is connected to the actuating element (28) through an opening (33) in the outer tube (3).
12. Linear actuator according to claim 6, characterized in that the actuating element (28) comprises a first stop (29) and a second stop (30), and the spindle nut (16) is arranged between the first stop (29) and the second stop (30).
13. Linear actuator according to claim 12, characterized in that the first stop (29) is arranged on a flexible tongue (34).
14. Linear actuator according to any of claims 12 to 13, characterized in that the actuating element (28) is continuous inside the outer tube (3) on both sides of the sliding portion (32).
Technical Field
The invention relates to a linear actuator comprising a console, an outer tube connected to the console, a motor, a transmission and a spindle connected to the motor via the transmission. The linear actuator further comprises a spindle nut on the spindle and an inner tube connected to the spindle nut. The spindle nut and the inner tube are guided inside the outer tube and move along the longitudinal axis of the spindle, into or out of the outer tube depending on the direction of rotation of the motor. The linear actuator comprises a control box which is connected to the console by a snap connection. The linear actuator further comprises an end stop with an end switch for each direction of movement of the spindle nut.
Background
In a conventional linear actuator system comprising at least one linear actuator, a controller arranged in a control box, an operating unit and a power supply, these elements are connected by wires in a distributed system. To limit wiring, the control box is typically connected to a linear actuator. However, such a connection is for example done by using a bracket arranged on the linear actuator, which will act as an adapter and thus enable the connection of the control box. For some linear actuators, the bracket is even supplemented with, for example, clips for preventing the control box from falling off the linear actuator. Examples of such prior art linear actuators may be found, for example, in US2010/178793a1 and WO2016/074678a 1.
When the spindle nut has reached the end position of the stroke length during operation, it is dangerous to further operate the motor in the same direction. In extreme cases, such further movement of the driven element may damage the linear actuator. To avoid damage, end stops are provided. When the spindle nut and thus the inner tube reach the end position, the end switch is activated, stopping further operation of the motor.
In the linear actuator of the prior art, the end switch arrangement comprises a first end switch arranged at a first end of the outer tube and a second end switch arranged at a second end of the outer tube. Both end switches are mounted on a printed circuit board. The printed circuit board thus requires a considerable length and takes up a large space inside the outer tube, see for example WO02/292284a1 by LINAK a/S. It is also common to integrate the end switch device in the housing or cabinet of the linear actuator, as shown in WO2012/083951a1 by LINAK a/S. Both of these structures are complex and therefore costly to assemble.
Disclosure of Invention
It is an object of the invention to provide a simpler connection of a control box to a linear actuator. Another object is to provide a simpler construction of the end stop arrangement of the linear actuator.
This object is solved by a linear actuator according to the preamble of
In one embodiment of the invention, the control box comprises a hook and the console comprises a counterpart of the hook, and the hook and the counterpart of the hook constitute a snap connection. Thus, the control box can be connected to the rest of the linear actuator by a single and simple operation.
In another embodiment, the hook of the control box is elastic.
In one embodiment of the invention, the counterpart of the hook is a hole in the front end of the console.
In one embodiment of the invention, the snap connection is releasable. Thus, the control box can be disengaged and re-engaged without damaging the snap connection.
In one embodiment, the linear actuator comprises a sliding element arranged between the spindle nut and the end switch, and the sliding element is actuated by the spindle nut and converts the maximum stroke length of the spindle nut into a smaller stroke length.
In such a linear actuator, the printed circuit board for mounting the end switch can be much smaller. The end switch no longer needs to have the same length as the stroke of the driven element for the printed circuit board.
In one embodiment of the invention, the sliding element is arranged inside the console.
In one embodiment of the invention, the sliding element is moved by the spindle nut in a first direction in a predetermined first end section of the stroke length and in a second direction opposite to the first direction in a predetermined second end section of the stroke length. Thus, the sliding element does not move over the majority of the movement travel of the spindle nut. Only when the spindle nut reaches the end of its stroke length does the spindle nut move the slide element and activate the end stop switch, stopping the motor. The spindle nut can then only be moved in the reverse direction.
In one embodiment of the invention, the linear actuator comprises a control box connected to the console, wherein the end stop switch is arranged in the control box. In this way, the mechanical part of the linear actuator and the electrical part of the linear actuator (in particular the control part) can be separated. Furthermore, depending on the desired specifications of the linear actuator, different types of end stop switches may be used without having to change the linear actuator or use a different type of actuator.
In one embodiment of the invention, the sliding element comprises a pin protruding outside the console. While the sliding element is positioned inside the console, the pin may actuate an end switch disposed outside the console.
In one embodiment of the invention, the actuating element is arranged inside the outer tube and the sliding part is arranged outside the outer tube. The pin is arranged on the sliding portion, and the sliding portion is connected to the actuating element through an opening in the outer tube. The sliding portion may have a width perpendicular to its moving direction that is greater than a corresponding width of the opening in the outer tube. In this way, the sliding portion can remain on the outside of the outer tube, although for example a spindle nut can move the actuating element.
In one embodiment of the invention, the actuating element comprises a first stop and a second stop, and the spindle nut is arranged between the first stop and the second stop.
In one embodiment of the invention, the first stop is arranged on the flexible tongue. This enables the spindle unit to be inserted via the console rear end, wherein the first stop can be deflected in the outward direction by means of the flexible tongue to allow the spindle nut to pass the first stop. This facilitates assembly of the linear actuator, but does not damage the spindle nut or the first stop.
In one embodiment of the invention, the actuating element is continuous inside the outer tube on both sides of the sliding portion. The position of the actuating element relative to the spindle can be fixed in this way.
Drawings
Embodiments of the invention will now be described in more detail with reference to the accompanying drawings, in which:
fig. 1 shows a perspective view of a linear actuator;
figure 2 shows a perspective view of the linear actuator, partly broken away in the longitudinal direction;
FIG. 3 shows a front view of the linear actuator;
FIG. 4 is a perspective view of a linear actuator with a smaller control pod;
FIG. 5 is an exploded perspective view of the linear actuator with the larger control pod not yet connected to the console;
FIG. 6 is an exploded side view of the linear actuator of FIG. 5, with a larger control pod not yet connected to the console;
FIG. 7 is a perspective view of the linear actuator of FIGS. 5 and 6 with a larger control pod attached to the console;
FIG. 8 is a perspective view of the console, outer tube and sliding element with a portion of the console cut away;
FIG. 9 is a longitudinal cross-sectional view of components of the linear actuator shown in FIG. 8;
FIG. 10 is an exploded perspective view of the components of the linear actuator shown in FIGS. 8 and 9;
fig. 11 is a perspective view of the control box; and is
Fig. 12 is a schematic view of an end switch.
Detailed Description
Fig. 1 shows a perspective view of a
The
The
The
A
The end of the
The front end of the
The
Fig. 4 shows the
The linear actuator comprises an end stop for stopping the
The end stop has a
The end switches 21, 22 are activated when the
A part of the
Fig. 5 to 7 show the
When the
The sliding
The sliding
When the
As can be seen in particular in fig. 5, the first stop 29 is arranged on the
The
Since the sliding
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