Multi-position change-over switch

Abstract

The invention relates to the technical field of change-over switches, and provides a multi-position change-over switch, which comprises a static contact group, a moving contact group, a main shaft for driving the moving contact group to act so as to be in contact with the static contact group, an encoder and a limiting structure for limiting the rotation stroke of the encoder, and the encoder is coaxially connected with the main shaft. The encoder is adopted, any position of the multi-position switch can be displayed due to angle display, recognition and control over any position of the system are achieved, in addition, a limiting structure is adopted, it is guaranteed that the encoder acts in a given interval, encoding abnormity caused by multi-circle rotation is avoided, and reliable position recognition of the multi-position switch is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of transfer switches, in particular to a multi-position transfer switch. Background Art

[0002] At present, in the switch industry, due to the diversification of system functions, the complexity of electrical circuits has increased, so multi-position switches are increasingly used. Traditional multi-position switches generally achieve multi-position connection through linear motion or rotational motion, and their position feedback is provided to the outside through the travel switch. When the moving contact is in the working position, the travel switch can accurately feedback the current position status of the multi-position switch. When the initial position setting problem or the equipment power failure during the equipment conversion process, etc., the multi-position conversion switch is eventually not in the working position, that is, the multi-position switch is in the middle position of the working position. At this time, the travel switch cannot provide switch position status information to the outside, and external manual or electric operation cannot identify forward or reverse rotation to reach the next target position. Summary of the invention

[0003] The object of the present invention is to provide a multi-position switch which can at least solve some of the defects in the prior art.

[0004] To achieve the above-mentioned objectives, an embodiment of the present invention provides the following technical solutions: a multi-position switching switch, comprising a static contact group, a moving contact group and a main shaft for driving the moving contact group to contact the static contact group, and also comprising an encoder and a limit structure for limiting the rotational stroke of the encoder, wherein the encoder is coaxially connected to the main shaft.

[0005] Furthermore, the limiting structure includes a stop block and a limit block driven to rotate by the main shaft, the stop block has a starting stop position and an ending stop position, the starting point of the limit block rotation path is on the starting stop block, and the ending point of the limit block rotation path is on the ending stop block.

[0006] Furthermore, the stop block is L-shaped, and the L-shaped stop block includes a vertical section and a horizontal section forming a right angle, the starting stop position is located on a side wall of the vertical section close to the right angle, and the ending stop position is located on a side wall of the vertical section away from the right angle.

[0007] Furthermore, the limit block includes a block body and contacts arranged at both ends of the block body, the two contacts are symmetrically arranged on the block body, the central position of the block body is connected to the main shaft, and when the limit block rotates, the two contacts respectively contact the starting stop position and the ending stop position.

[0008] Furthermore, it also includes a shell for installing the static contact group, the moving contact group and the main shaft, and the encoder is installed on the shell through a detachable structure.

[0009] Furthermore, the detachable structure includes a thrust shaft and a U-shaped shaft, the thrust shaft is coaxially connected to the main shaft, the U-shaped shaft has a U-shaped groove for the thrust shaft to be inserted into, and the encoder is threadedly connected to the U-shaped shaft.

[0010] Furthermore, it also includes locking pins for fixing the main shaft and the thrust shaft.

[0011] Furthermore, the thrust shaft is provided with a groove, and the locking pin is locked in the groove.

[0012] Furthermore, the encoder is detachably mounted on the housing via a mounting bracket.

[0013] Furthermore, it also includes a travel switch group for driving the main shaft to rotate and for limiting the action stroke of the moving contact group.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The encoder is used. Due to the angle display, it can display any position of the multi-position switch, realizing the recognition and control of any position of the system. In addition, the limit structure is used to ensure that the encoder operates within a given range, avoiding encoding abnormalities caused by multiple turns, and ensuring reliable position recognition of the multi-position conversion switch.

[0016] 2. The setting of the U-shaped shaft makes it easy for the encoder and the mounting frame to be installed and disassembled separately from the switch body, which is convenient for the maintenance of the equipment and ensures the safety and reliability of the multi-position conversion switch.

[0017] 3. A groove is set in the middle of the thrust shaft to facilitate locking of the locking screw, ensuring the synchronization and reliability of the moving contact and encoder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a multi-position switch provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the coordination between an encoder, a mounting bracket, a U-shaped shaft, a thrust shaft and a main shaft of a multi-position switch provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the connection between a thrust shaft and a main shaft of a multi-position switch provided by an embodiment of the present invention;

[0021] Figure 4A schematic diagram of a limit block and a stop block of a multi-position switch provided by an embodiment of the present invention at a starting stroke;

[0022] Figure 5 A schematic diagram of a limit block and a stop block of a multi-position switch provided by an embodiment of the present invention at the end of the stroke;

[0023] In the accompanying drawings: 1-switch body; 11-driving assembly; 12-static contact group; 13-moving contact group; 14-main shaft; 15-travel switch group; 2-encoder assembly; 21-encoder; 22-mounting frame; 23-U-shaped shaft; 24-thrust shaft; 25-locking pin; 26-limit block; 27-stop block. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figures 1 to 5 , an embodiment of the present invention provides a multi-position conversion switch, which can be divided into a switch body 1 part and an encoder component 2 part. The encoder component 2 can be detachably mounted on the switch body 1 part. The switch body 1 part includes a drive component 11, a static contact group 12, a moving contact group 13, a static contact group 12, a main shaft 14, a travel switch group 15, etc. The encoder component 2 part includes an encoder 21, a mounting frame 22, a U-shaped shaft 23, a thrust shaft 24, a locking pin 25, a limit block 26 and a stop block 27. The encoder 21 is preferably an absolute encoder, which can identify the angle of the rotation position, which is conducive to realizing the recognition and control of any position of the system.

[0026] See also Figures 1 to 5 , the main shaft 14 is used to drive the moving contact group 13 to contact the static contact group 12, or to drive the moving contact group 13 away from the static contact group 12, so as to achieve connection or disconnection. The encoder 21 is designed in this embodiment. Since the encoder 21 is an angle display, it can display any position of the multi-position switch, realizing the recognition and control of any position of the system. On this basis, the encoder 21 is also designed with a limit structure in this embodiment, so as to ensure that the encoder 21 operates within a given range, avoid encoding abnormalities caused by multiple turns of rotation, and ensure reliable position recognition of the multi-position conversion switch.

[0027] See also Figures 1 to 5, the above-mentioned limiting structure is refined. The limiting structure includes a stop block 27 and a limit block 26 driven to rotate by the spindle 14, the stop block 27 has a starting stop position and an ending stop position, the starting point of the rotation path of the limit block 26 is on the starting stop block 27, and the ending point of the rotation path of the limit block 26 is on the ending stop block 27. In this embodiment, the human limiting of the encoder 21 is achieved by designing the stop block 27 and the limit block 26. Specifically, the limit block 26 is driven to rotate by the spindle 14, and when it rotates, it will touch the stop block 27. By designing the starting stop position and the ending stop position of the stop block 27, we can first limit the rotation of the limit block 26 to a range, thereby limiting the rotation of the spindle 14 and the encoder 21. Preferably, the stop block 27 is L-shaped, and the L-shaped stop block 27 includes a vertical section and a horizontal section forming a right angle, the starting stop position is located on a side wall of the vertical section close to the right angle, and the ending stop position is located on a side wall of the vertical section away from the right angle. Designing the stop block 27 into an L shape can cleverly utilize the structural features of the L shape, such as Figure 4 and Figure 5 As shown, Figure 4 When in the starting position, the vertical sections of the limit block 26 and the stop block 27 are in contact with each other near the right angle, thereby playing a stopping role. Figure 5 When the stop block 26 is in the terminal position, the vertical section of the stop block 27 contacts the side away from the right angle, thereby playing a stopping role. The L-shaped stop block 27 is easy to make and can play a stopping role, which improves product performance and saves costs. Preferably, the limit block 26 includes a block body and contacts arranged at both ends of the block body, and the two contacts are symmetrically arranged on the block body. The central position of the block body is connected to the main shaft 14. When the limit block 26 rotates, the two contacts contact the starting stop position and the terminal stop position respectively. The structure of the limit block 26 is detailed. It can be regarded as a semicircular block, and then contacts are arranged on both sides of the block body. The two contacts are symmetrically arranged, so that they can accurately abut the two stop positions during the rotation process. Similarly, the structure of the limit block 26 is also simple, easy to make, and can reduce costs.

[0028] See also Figures 1 to 5 , the switch also includes a shell for installing the static contact group 12, the moving contact group 13 and the main shaft 14, and the encoder 21 is installed on the shell through a detachable structure. In this embodiment, the design of the shell facilitates the installation of various parts. The shell can be made of several plates spliced ​​together and can be designed into a required structural form as needed. For example, the shell of this embodiment is composed of two plates arranged opposite to each other. The static contact group 12 and the moving contact group 13 can be arranged between the two plates and fixed on the plates. Figure 4 and Figure 5As shown, the above-mentioned limiting structure is arranged on the board, specifically, on the side of the board away from the encoder 21, that is, the limiting structure is located in the space between the two boards.

[0029] See also Figures 1 to 5 , the detachable structure includes a thrust shaft 24 and a U-shaped shaft 23, the thrust shaft 24 is coaxially connected to the main shaft 14, the U-shaped shaft 23 has a U-shaped groove for the thrust shaft 24 to be inserted, and the encoder 21 is threadedly connected to the U-shaped shaft 23. It also includes a locking nail 25 for fixing the main shaft 14 and the thrust shaft 24. The thrust shaft 24 is provided with a groove, and the locking nail 25 is locked on the groove, ensuring the synchronization and reliability of the moving contact and the encoder 21. In this embodiment, the thrust shaft 24 is installed on the main shaft 14 of the multi-position switch, and a groove is provided in the middle part of the thrust shaft 24 to facilitate the locking of the locking nail 25, thereby ensuring the synchronization and reliability of the moving contact group 13 and the encoder 21. The thrust shaft 24 is inserted into the U-shaped groove of the U-shaped shaft 23, so that the encoder 21 and the mounting frame 22 can be installed and removed separately from the switch body 1, which is convenient for the maintenance of the equipment and ensures the safety and reliability of the multi-position conversion switch; the encoder 21 is threadedly connected to the U-shaped shaft 23 and is installed with the multi-position conversion switch through the mounting frame 22. The encoder 21 is detachably mounted on the housing through the mounting frame 22, that is, the mounting frame 22 is mounted on one of the plates of the housing.

[0030] See also Figures 1 to 5 The switch further comprises a driving assembly 11 for driving the main shaft 14 to rotate and a travel switch assembly 15 for limiting the action stroke of the moving contact assembly 13. The driving assembly 11 is used to provide driving force, and the travel switch assembly 15 is used to limit the action stroke of the moving contact assembly 13.

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

Claims

1. A multi-position switch, comprising a stationary contact group, a moving contact group and a main shaft for driving the moving contact group to contact the stationary contact group, characterized in that: It also includes an encoder and a limiting structure for limiting the rotational travel of the encoder, and the encoder is coaxially connected to the main shaft.

2. A multi-position switch according to claim 1, characterized in that: The limiting structure includes a stop block and a limit block driven to rotate by the main shaft, the stop block has a starting stop position and an ending stop position, the starting point of the limit block rotation path is on the starting stop block, and the ending point of the limit block rotation path is on the ending stop block.

3. A multi-position switch according to claim 2, characterized in that: The stop block is L-shaped, and the L-shaped stop block includes a vertical section and a horizontal section forming a right angle. The starting stop position is located on a side wall of the vertical section close to the right angle, and the ending stop position is located on a side wall of the vertical section away from the right angle.

4. A multi-position switch according to claim 2, characterized in that: The limit block includes a block body and contacts arranged at both ends of the block body, the two contacts are symmetrically arranged on the block body, the central position of the block body is connected to the main shaft, and when the limit block rotates, the two contacts respectively contact the starting stop position and the ending stop position.

5. A multi-position switch according to claim 1, characterized in that: It also includes a shell for installing the static contact group, the moving contact group and the main shaft, and the encoder is installed on the shell through a detachable structure.

6. A multi-position switch according to claim 5, characterized in that: The detachable structure comprises a thrust shaft and a U-shaped shaft, wherein the thrust shaft is coaxially connected to the main shaft, the U-shaped shaft has a U-shaped groove for the thrust shaft to be inserted into, and the encoder is threadedly connected to the U-shaped shaft.

7. A multi-position switch according to claim 6, characterized in that: It also includes locking pins for fixing the main shaft and the thrust shaft.

8. A multi-position switch according to claim 7, characterized in that: The thrust shaft is provided with a groove, and the locking pin is locked on the groove.

9. A multi-position switch according to claim 5, characterized in that: The encoder is detachably mounted on the housing via a mounting bracket.

10. A multi-position switch according to claim 1, characterized in that: It also includes a driving assembly for driving the main shaft to rotate and a travel switch group for limiting the action stroke of the moving contact group.

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