Power-off self-locking linear motor

Abstract

The power-off self-locking linear motor comprises a rotor assembly, a stator assembly and a power-off self-locking mechanism used for locking the rotor assembly during power off, and the power-off self-locking mechanism comprises a locking piece, a locking block and a driving mechanism used for driving the locking block to make contact with the locking piece during power off. The device is simple in structure, and equipment collision caused by movement of a machine table due to an inertia phenomenon or human careless touch during power failure can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of linear motors, and particularly to a power-off self-locking linear motor. Background Art

[0002] An optical fiber coupling platform is usually an XYZ built with a linear motor. The accuracy of this platform belongs to the ultra-high precision level, and the equipment mounted on it is often expensive, such as cameras. There will be power outages in factories. Once a power outage occurs, the XY axes may slide due to inertia, and then there may be a phenomenon of damaging expensive equipment. Therefore, there is an urgent need for a linear motor that can be applied to an optical fiber coupling platform and self-lock during a power outage. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a power-off self-locking linear motor to achieve power-off self-locking.

[0004] To solve the above technical problem, an embodiment of the present invention provides a power-off self-locking linear motor, including a mover assembly and a stator assembly, and further including a power-off self-locking mechanism for locking the mover assembly during a power outage. The power-off self-locking mechanism includes a locking piece, a locking block, and a driving mechanism for driving the locking block to contact the locking piece during a power outage.

[0005] Further, the surface of the locking piece corresponding to the locking block is parallel to the moving direction of the mover assembly, and the length of this surface is greater than or equal to the moving stroke of the mover assembly.

[0006] Further, the locking block is L-shaped.

[0007] Further, a locking portion is convexly provided on one side of the locking block corresponding to the locking piece.

[0008] Further, the driving mechanism includes a cylinder, an elastic member, and a rotating shaft. The locking block is installed through the rotating shaft, one end of the locking block faces the locking piece, and the cylinder and the elastic member are respectively arranged on both sides of the other end of the locking block.

[0009] Further, the elastic member applies an elastic force to the locking block to separate the locking block from the locking piece; the cylinder is connected to an external air source through a normally closed solenoid valve and drives the locking block to contact the locking piece during a power outage.

[0010] Further, the locking piece is arranged on the stator assembly side, and the locking block and the driving mechanism are arranged on the mover assembly side.

[0011] Further, the surface of the locking piece corresponding to the locking block is a rough surface.

[0012] The beneficial effect of the present invention is that the structure of the present invention is simple, and it can avoid the collision of equipment caused by the movement of the machine due to inertia or accidental touch by humans during a power outage. Description of the Drawings

[0013] Figure 1 is a three - dimensional structure diagram of the power - off self - locking linear motor according to an embodiment of the present invention.

[0014] Figure 2 is a three - dimensional structure diagram of the power - off self - locking mechanism according to an embodiment of the present invention.

[0015] Figure 3 is a side view of the power - off self - locking mechanism according to an embodiment of the present invention.

[0016] Figure 4 is a partial structure diagram of the power - off self - locking mechanism according to an embodiment of the present invention.

[0017] Description of the Reference Numerals in the Drawings The mover assembly 10, the stator assembly 20, the power - off self - locking mechanism 30, the locking piece 31, the locking block 32, the locking portion 33, the cylinder 34, the elastic member 35, the rotating shaft 36, the base 37, the cylinder rod 38. Detailed Embodiments

[0018] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0019] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0020] In addition, in the present invention, the descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0021] Please refer to Figures 1 to 4 , the power - off self - locking linear motor according to an embodiment of the present invention includes a mover assembly, a stator assembly, and a power - off self - locking mechanism for locking the mover assembly when power is off.

[0022] The power - off self - locking mechanism includes a locking piece, a locking block, and a driving mechanism for driving the locking block to contact the locking piece when power is off. The present invention brakes and locks by the frictional force when the locking piece contacts the locking block.

[0023] As an implementation manner, the surface of the locking piece facing the locking block is parallel to the moving direction of the mover assembly, and the length of this surface is greater than or equal to the moving stroke of the mover assembly, so that the mover assembly can be locked when powered off at any position.

[0024] As an implementation manner, the locking block is L-shaped. The L-shaped locking block can make the structure of the power-off self-locking mechanism more compact.

[0025] As an implementation manner, a locking portion is convexly provided on one side of the locking block corresponding to the locking piece. The locking portion improves the friction force with the locking piece, so that the linear motor can be locked more quickly when powered off.

[0026] As an implementation manner, the driving mechanism includes a cylinder, an elastic member, a rotating shaft, and a base. The locking block is installed on the base through the rotating shaft, and one end of the locking block faces the locking piece. The cylinder and the elastic member are respectively arranged on both sides of the other end of the locking block. The elastic member and the cylinder rod of the cylinder (the front end of the cylinder rod is in contact with the locking block. Specifically, a pressing head can also be installed at the front end of the cylinder rod, and the cylinder rod pushes the locking block through the pressing head) are in contact with the locking block.

[0027] The elastic member applies an elastic force to the locking block to separate the locking block from the locking piece. The elastic member is preferably a spring. Specifically, a pin can be installed on the spring to apply an elastic force to the locking block through the pin. The cylinder is connected to an external air source through a normally closed solenoid valve and drives the locking block to contact the locking piece when powered off. The cylinder is connected to an external air source and compressed air is introduced. The on-off of the gas is controlled by a solenoid valve. In the non-working state (i.e., non-powered-off situation), the cylinder is not connected to compressed air, the cylinder rod retracts, and the locking block rotates around the rotating shaft under the action of the spring and moves away from the locking piece. In the working state (i.e., powered-off state), the cylinder is connected to compressed air, the cylinder rod extends, pushes out the locking block and then presses it against the locking piece to brake and lock.

[0028] As an implementation manner, the locking piece is arranged on the stator assembly side, and the locking block and the driving mechanism are arranged on the mover assembly side, that is, the locking piece is stationary and the locking block moves with the mover assembly. Specifically, according to needs, the locking piece can also be arranged on the mover assembly side and the locking block can be arranged on the stator assembly side.

[0029] As an implementation manner, the surface of the locking piece facing the locking block is a rough surface, which increases the friction force between the locking piece and the locking block to improve the power-off locking effect.

[0030] The present invention can automatically lock the position when powered off, prevent the load from moving, ensure the safety of the system, and avoid out-of-control or damage caused by power-off; when powered off or malfunctioning, the self-locking function of the present invention prevents the load from sliding or moving, reducing the accident risk; the present invention reduces the dependence on additional mechanical braking devices, simplifies the system structure, and reduces the cost and complexity.

[0031] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power-off self-locking linear motor, comprising a mover assembly and a stator assembly, characterized in that: It also includes a power-off self-locking mechanism for locking the moving subassembly when the power is off. The power-off self-locking mechanism includes a locking sheet, a locking block, and a driving mechanism for driving the locking block to contact the locking sheet when the power is off.

2. The power-off self-locking linear motor according to claim 1, characterized in that: The surface of the locking plate corresponding to the locking block is parallel to the moving direction of the movable assembly, and the length of the surface is greater than or equal to the moving stroke of the movable assembly.

3. The power-off self-locking linear motor according to claim 1, characterized in that: The locking block is L-shaped.

4. The power-off self-locking linear motor according to claim 1, characterized in that: A locking portion is protruded from one side of the locking block corresponding to the locking sheet.

5. The power-off self-locking linear motor according to claim 1, characterized in that: The driving mechanism comprises a cylinder, an elastic member and a rotating shaft. The locking block is installed through the rotating shaft. One end of the locking block faces the locking plate. The cylinder and the elastic member are correspondingly arranged on both sides of the other end of the locking block.

6. The power-off self-locking linear motor according to claim 5, characterized in that: The elastic member applies elastic force to the locking block to separate the locking block from the locking plate; the cylinder is connected to an external air source through a normally closed solenoid valve, and drives the locking block to contact the locking plate when the power is off.

7. The power-off self-locking linear motor according to claim 1, characterized in that: The locking piece is arranged on the stator assembly side, and the locking block and the driving mechanism are arranged on the mover assembly side.

8. The power-off self-locking linear motor according to claim 1, characterized in that: The surface of the locking sheet corresponding to the locking block is a rough surface.

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