Multiway travel switch contactor

Abstract

The application discloses a multi-path travel switch contactor and belongs to the technical field of travel switches. The multi-path travel switch contactor comprises a static contact system and a dynamic contact system. The static contact system comprises N static contact piece groups, and the N static contact piece groups are arranged in a ring to form a cage type contact ring. The dynamic contact system comprises N dynamic contact pieces. The N dynamic contact pieces are arranged on the inner side of the cage type contact ring formed by the N static contact piece groups, and the N dynamic contact pieces and the N static contact piece groups form sliding contact pairs one by one. N is a natural number. In the case that the contactor synchronously outputs path signals, the number of the dynamic contact pieces is halved, the structure of the dynamic contact system is simplified, the number of the signals to be debugged in the later period is halved, and the debugging difficulty of the travel switch contactor is greatly reduced.

Description

Technical Field

[0001] This invention relates to a multi-channel limit switch contactor, belonging to the field of limit switch technology. Background Technology

[0002] With the continuous upgrading and improvement of the reliability requirements of modern aerospace control systems, limit switches are required to output multiple signals to enable the control system to accurately identify the flight status of the aircraft and provide a basis for judgment for the operation and command system. The success or failure of the limit switch's operation directly determines the success or failure of the system's mission execution.

[0003] To address this issue, the applicant has developed a limit switch contactor with multiple signals, application number CN201811101722.0. The contactor includes stationary contacts and moving contacts. There are 2N moving contacts, all evenly distributed on the same outer circumference of the shaft and parallel to the axis. N mounting rings are fitted onto the shaft, each connecting two parallel moving contacts. One end of the stationary contact is fixed to a terminal pin, and the other end contacts the surface of the moving contact; N is a natural number. This modification changes the arrangement of the contact group in the contact system, increasing the number of backup contact groups to improve the reliability of the control system.

[0004] Although this limit switch contactor meets the requirements for multi-channel signal output, it still has the following shortcomings: the number of mounting rings and moving contacts in the moving contact system is relatively large, which not only increases the structural complexity of the moving contact system, but also leads to an increase in the number of signal channels that need to be debugged later, thus increasing the debugging difficulty of the limit switch contactor. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a multi-way limit switch contactor.

[0006] This invention is achieved through the following technical solution:

[0007] A multi-way limit switch contactor includes a static contact system and a moving contact system. The static contact system includes N groups of static contact pieces, which are arranged in a ring to form a cage-like contact ring. The moving contact system includes N moving contact pieces, which are arranged in a ring inside the cage-like contact ring formed by the N groups of static contact pieces. The N moving contact pieces and the N groups of static contact pieces correspond one-to-one to form a sliding contact pair, where N is a natural number.

[0008] The dynamic contact system also includes N / 2 mounting rings, each mounting ring having two dynamic contact pieces evenly distributed on its outer circumference, and the two dynamic contact pieces are arranged along the axial direction of the mounting ring.

[0009] A positioning sleeve is provided between two adjacent mounting rings in N / 2 mounting rings. The positioning sleeve includes a cylindrical sleeve and four insulating protrusions evenly distributed on the outer circumference of the cylindrical sleeve, and the four insulating protrusions are arranged along the axial direction of the cylindrical sleeve.

[0010] The moving contact pieces on the left and right mounting rings of the positioning sleeve are staggered and inserted into the positioning sleeve. The surface of the moving contact piece that contacts the stationary contact piece group is arc surface A, and the surface of the insulating convex key that is away from the cylindrical sleeve is arc surface B. Arc surface B and arc surface A are arranged coaxially and have the same radius.

[0011] The moving contact system includes two mounting rings, four moving contact pieces, and a positioning sleeve. The positioning sleeve is fitted onto the push rod. The two mounting rings are respectively fitted onto the push rod through insulating sleeves. The push rod is also fitted with a clamping sleeve, an outer insulating bushing, and an inner insulating bushing in sequence, with the positioning sleeve and the two mounting rings located between the outer insulating bushing and the inner insulating bushing.

[0012] Two anti-rotation blocks A are provided at one end of the positioning sleeve. An anti-rotation groove A is provided at the end of the inner insulating bushing near the positioning sleeve at a position corresponding to the anti-rotation block A, and the anti-rotation block A is inserted into the anti-rotation groove A.

[0013] The outer insulating bushing, moving contact piece, positioning sleeve, inner insulating bushing, and push rod have the same outer diameter.

[0014] The push rod is coaxially provided with a blind hole, and the clamping sleeve is close to the opening of the blind hole. One end of the clamping sleeve is limited by the push rod expansion riveting. The end of the inner insulating bushing away from the positioning sleeve is limited by the shoulder on the push rod. One end of the inner insulating bushing is provided with two anti-rotation grooves B. The push rod is provided with anti-rotation blocks B at positions corresponding to the anti-rotation grooves B, and the anti-rotation blocks B are inserted into the anti-rotation grooves B.

[0015] The static contact system includes four static contact piece groups, and each static contact piece group includes two static contact pieces.

[0016] Two stationary contact pieces in the same group of stationary contact pieces are in contact with the two ends of the moving contact piece in the circumferential direction of the cage-type contact ring.

[0017] The beneficial effects of this invention are as follows: In the case of synchronous output signal of the contactor, this application realizes that the number of moving contact pieces is halved, which simplifies the structure of the moving contact system and reduces the number of signal paths that need to be debugged later, greatly reducing the debugging difficulty of the limit switch contactor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the contactor's contact principle according to the present invention;

[0019] Figure 2 Exploded view of the positioning sleeve, moving contact piece and insulating sleeve of the present invention;

[0020] Figure 3 This is an assembly diagram of the positioning sleeve, moving contact piece, and insulating sleeve of the present invention;

[0021] Figure 4 for Figure 3 A structural diagram from another perspective;

[0022] Figure 5 This is a schematic diagram of the positioning sleeve of the present invention;

[0023] Figure 6 This is a left view of the dynamic contact system of the present invention;

[0024] Figure 7 for Figure 6 Sectional view along AA;

[0025] Figure 8 This is an assembly diagram of the moving contact piece and the mounting ring of the present invention;

[0026] Figure 9 for Figure 8 A structural diagram from another perspective;

[0027] Figure 10 This is a schematic diagram of the static contact system of the present invention;

[0028] Figure 11 This is a circuit diagram of the present invention when the moving contact piece and the stationary contact piece are in contact;

[0029] Figure 12 This is a circuit diagram of the present invention when the moving contact piece and the stationary contact piece are not in contact.

[0030] In the diagram: 1-static contact system, 11-screw, 12-terminal pin, 13-support base, 14-support piece, 15-solder, 17-static contact piece;

[0031] 2-Moving contact system, 21-Pressure sleeve, 22-Outer insulating bushing, 23-Moving contact piece, 24-Positioning sleeve, 240-Cylindrical sleeve, 241-Insulating key, 242-Anti-rotation block A, 25-Insulating sleeve, 26-Inner insulating bushing, 27-Push rod. Detailed Implementation

[0032] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0033] Example 1:

[0034] like Figures 1 to 12As shown, the multi-way limit switch contactor of the present invention includes a static contact system 1 and a moving contact system 2. The static contact system 1 includes N static contact piece groups, which are arranged in a ring to form a cage-like contact ring. The moving contact system 2 includes N moving contact pieces 23, which are arranged in a ring inside the cage-like contact ring formed by the N static contact piece groups. The N moving contact pieces 23 correspond one-to-one with the N static contact piece groups to form sliding contact pairs, where N is a natural number. Figure 1 As shown, when N=4, the static contact system 1 includes 4 groups of static contact pieces. If each group of static contact pieces includes two static contact pieces 17, then there are 8 static contact pieces 17. At this time, the moving contact system 2 includes 4 moving contact pieces 23. The contactor can output 4 signals simultaneously, and only the two signals corresponding to the two groups of moving contact pieces 23 need to be debugged during later debugging. It can be seen that compared with the prior art, in the case of the contactor simultaneously outputting 4 signals, this application halves the number of moving contact pieces 23, which simplifies the structure of the moving contact system 2 and halves the number of signal paths that need to be debugged later, greatly reducing the debugging difficulty of the limit switch contactor.

[0035] The moving contact system 2 also includes N / 2 mounting rings, each with two moving contact pieces 23 evenly distributed on its outer circumference, arranged axially along the mounting ring. When the number of moving contact pieces 23 is halved, the number of mounting rings is also halved accordingly, resulting in only two mounting rings, which simplifies the structure of the moving contact system 2. The mounting rings are integrally manufactured with the two moving contact pieces 23, providing mounting support while simultaneously enabling electrical conduction between them. Both the mounting rings and the two moving contact pieces 23 are made of silver alloy, with the entire surface plated with gold-nickel alloy to improve contact stability and extend service life.

[0036] A positioning sleeve 24 is installed between two adjacent mounting rings in N / 2 of the mounting rings. The positioning sleeve 24 includes a cylindrical sleeve 240 and four insulating protrusions 241 evenly distributed on the outer circumference of the cylindrical sleeve 240, with the four insulating protrusions 241 arranged along the axial direction of the cylindrical sleeve 240. With the number of moving contact pieces 23 halved, the number of positioning sleeves 24 used is also reduced, which helps simplify the structure of the moving contact system 2. Slots for mounting the moving contact pieces 23 are formed between adjacent insulating protrusions 241, and the four slots enable the positioning and insertion of the four moving contact pieces 23 on the positioning sleeve 24.

[0037] The movable contact pieces 23 on the left and right mounting rings of the positioning sleeve 24 are staggered and inserted into the positioning sleeve 24. The surface of the movable contact piece 23 that contacts the stationary contact piece group is an arc surface A, and the surface of the insulating convex key 241 that is away from the cylindrical sleeve 240 is an arc surface B. The arc surface B and the arc surface A are arranged coaxially and have the same radius. Compared with the prior art where the outer contour of the positioning sleeve 24 is a regular polygon, this application designs the surface of the insulating convex key 241 that is away from the cylindrical sleeve 240 as an arc surface B, which helps to reduce the processing difficulty of the positioning sleeve 24. Similarly, compared with the prior art where the outer surface of the movable contact piece 23 is a plane, this application designs the surface of the movable contact piece 23 that contacts the stationary contact piece group as an arc surface A, which helps to reduce the processing difficulty of the movable contact piece 23.

[0038] The moving contact system 2 includes two mounting rings, four moving contact pieces 23, and a positioning sleeve 24. The positioning sleeve 24 is fitted onto the push rod 27. The two mounting rings are respectively fitted onto the push rod 27 via insulating sleeves 25. A clamping sleeve 21, an outer insulating bushing 22, and an inner insulating bushing 26 are also sequentially fitted onto the push rod 27, with the positioning sleeve 24 and the two mounting rings located between the outer insulating bushing 22 and the inner insulating bushing 26. In use, the outer insulating bushing 22 and the inner insulating bushing 26 are made of polyimide, which has good self-lubricating properties and good processability, allowing the outer insulating bushing 22 and the inner insulating bushing 26 to achieve good surface roughness, ensuring contact stability, improving the working quality of the sliding contact pair, and extending the working life of the contacts.

[0039] Two anti-rotation blocks A242 are provided at one end of the positioning sleeve 24. An anti-rotation groove A is machined on the end of the inner insulating bushing 26 near the positioning sleeve 24 at a position corresponding to the anti-rotation blocks A242, and the anti-rotation blocks A242 are inserted into the anti-rotation groove A. The anti-rotation blocks A242 and the anti-rotation groove A are used to accurately position the relative installation position of the inner insulating bushing 26 and the positioning sleeve 24, and to prevent the positioning sleeve 24 from rotating.

[0040] The outer insulating bushing 22, the moving contact piece 23, the positioning sleeve 24, the inner insulating bushing 26, and the push rod 27 have the same outer diameter.

[0041] A blind hole is coaxially machined on the push rod 27. The clamping sleeve 21 is located near the opening of the blind hole, and one end of the clamping sleeve 21 is limited by the push rod 27 through riveting. The end of the inner insulating bushing 26 away from the positioning sleeve 24 is limited by the shoulder on the push rod 27. Two anti-rotation grooves B are machined on one end of the inner insulating bushing 26. An anti-rotation block B is provided on the push rod 27 at a position corresponding to the anti-rotation groove B, and the anti-rotation block B is inserted into the anti-rotation groove B. The blind hole on the push rod 27 facilitates the installation of a spring in the blind hole; the anti-rotation block B and the anti-rotation groove B are used to accurately position the relative installation position of the inner insulating bushing 26 and the push rod 27, and prevent the inner insulating bushing 26 from rotating.

[0042] The static contact system 1 includes four static contact piece groups, and each static contact piece group includes two static contact pieces 17.

[0043] Two stationary contact pieces 17 in the same stationary contact piece group are in contact with both ends of the moving contact piece 23 in the circumferential direction of the cage-type contact ring. The two stationary contact pieces 17 in the same stationary contact piece group are in contact with the two arc-shaped ends of the moving contact piece 23, that is, the two stationary contact pieces 17 are connected in parallel with the two ends of a certain moving contact piece 23, and a parallel redundant design structure is adopted.

[0044] like Figure 10 As shown, the static contact system 1 also includes a substrate, screws 11, terminals 12, a support base 13, and a bracket 14. Eight terminals 12 are sintered and evenly fixed to the substrate to form a base assembly. A limiting groove is designed in the axial center of the substrate to provide mounting support for the spring. Four screws 11 are riveted to the substrate and laser-reinforced. Static contact pieces 17 and brackets 14 are spot-welded to the terminals 12 and then riveted to the terminals 12. The riveted ends of the terminals 12 are brazed with solder 15. The working surfaces of the eight static contact pieces 17 form a contact circle to ensure consistent pressure when all static contact pieces 17 slide in contact with the corresponding contacts on the dynamic contact system 1. The base is welded and fixed to one end of the support base 13.

[0045] Specifically, the structure not described in detail in the multi-way limit switch contactor can be implemented with reference to the prior art with application number CN201811101766.3.

[0046] like Figure 11 and Figure 12 As shown, the contact circle formed by the eight static contact pieces 17 in the static contact system 1 and the outer circle formed by the four moving contact pieces 23 in the coaxially arranged moving contact system 2 slide and switch with each other to realize the connection and disconnection of the signal. The two static contact pieces 17, 1 and 5, are the two #1 static contact pieces 17; the two static contact pieces 2 and 6 are the two #2 static contact pieces 17; the two static contact pieces 3 and 7 are the two #3 static contact pieces 17; and the two static contact pieces 4 and 8 are the two #4 static contact pieces 17.

[0047] Example 2:

[0048] The difference between Real-Time Example 2 and Example 1 is that the static contact system 1 includes four static contact piece groups, and each static contact piece group includes three static contact pieces 17, which can realize the synchronous output of 6 signals.

Claims

1. A multi-way limit switch contactor, characterized in that: The system includes a static contact system (1) and a dynamic contact system (2). The static contact system (1) includes N static contact piece groups, and the N static contact piece groups are arranged in a ring to form a cage-like contact ring. The dynamic contact system (2) includes N dynamic contact pieces (23), and the N dynamic contact pieces (23) are arranged in a ring on the inside of the cage-like contact ring formed by the N static contact piece groups. The N dynamic contact pieces (23) and the N static contact piece groups correspond one-to-one to form a sliding contact pair, where N is a natural number. The dynamic contact system (2) also includes N / 2 mounting rings, each mounting ring having two dynamic contact pieces (23) evenly distributed on its outer circular surface, and the two dynamic contact pieces (23) are arranged along the axial direction of the mounting ring; A positioning sleeve (24) is provided between two adjacent mounting rings in N / 2 mounting rings. The positioning sleeve (24) includes a cylindrical sleeve (240) and four insulating protrusions (241) evenly distributed on the outer circumference of the cylindrical sleeve (240), and the four insulating protrusions (241) are arranged along the axial direction of the cylindrical sleeve (240). The moving contact pieces (23) on the left and right mounting rings of the positioning sleeve (24) are staggered and inserted into the positioning sleeve (24). The surface of the moving contact piece (23) that contacts the stationary contact piece group is arc surface A, and the surface of the insulating convex key (241) that is away from the cylindrical sleeve (240) is arc surface B. Arc surface B and arc surface A are arranged coaxially and have the same radius.

2. The multi-channel limit switch contactor as described in claim 1, characterized in that: The moving contact system (2) includes two mounting rings, four moving contact pieces (23) and a positioning sleeve (24). The positioning sleeve (24) is fitted onto the push rod (27). The two mounting rings are respectively fitted onto the push rod (27) through insulating sleeves (25). The push rod (27) is also fitted with a clamping sleeve (21), an outer insulating bushing (22) and an inner insulating bushing (26) in sequence. The positioning sleeve (24) and the two mounting rings are located between the outer insulating bushing (22) and the inner insulating bushing (26).

3. The multi-channel limit switch contactor as described in claim 2, characterized in that: The positioning sleeve (24) has two anti-rotation blocks A (242) at one end. The inner insulating bushing (26) has an anti-rotation groove A at the end near the positioning sleeve (24) corresponding to the anti-rotation block A (242), and the anti-rotation block A (242) is inserted into the anti-rotation groove A.

4. The multi-channel limit switch contactor as described in claim 2, characterized in that: The outer insulating bushing (22), moving contact piece (23), positioning sleeve (24), inner insulating bushing (26), and push rod (27) have the same outer diameter.

5. The multi-channel limit switch contactor as described in claim 2, characterized in that: The push rod (27) is coaxially provided with a blind hole, and the clamping sleeve (21) is close to the opening of the blind hole. One end of the clamping sleeve (21) is limited by the push rod (27) for expansion and riveting. The end of the inner insulating bushing (26) away from the positioning sleeve (24) is limited by the shoulder on the push rod (27). One end of the inner insulating bushing (26) is provided with two anti-rotation grooves B. The push rod (27) is provided with an anti-rotation block B at a position corresponding to the anti-rotation groove B, and the anti-rotation block B is inserted into the anti-rotation groove B.

6. The multi-channel limit switch contactor as described in claim 1, characterized in that: The static contact system (1) includes four static contact piece groups, and each static contact piece group includes two static contact pieces (17).

7. The multi-channel limit switch contactor as described in claim 6, characterized in that: Two stationary contact pieces (17) in the same stationary contact piece group are in contact with the two ends of the moving contact piece (23) in the circumferential direction of the cage contact ring.

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