Trigger mechanism for travel switch

Abstract

The utility model relates to a trigger mechanism for a travel switch, which comprises an operating shaft (1), a trigger pressing block (2) arranged on the operating shaft (1), and a travel switch (3) matched with the trigger pressing block (2) to monitor the rotation of the operating shaft (1), and is characterized in that the outer contour of the trigger pressing block (2) is of a symmetrical curved surface structure; the involute (5) and the second arc (6) are sequentially and symmetrically connected to the two ends of the first arc (4); the distance between any outer contour point of the trigger pressing block (2) and the rotating axis of the trigger pressing block (2) is not larger than the radius of the first arc (4) and not smaller than the radius of the second arc (6). The trigger mechanism for the travel switch has the advantages of simple structure, long service life of the travel switch and reliable operation, and avoids the situation that the contact is not in place or the contact is crushed when the contact of the travel switch is triggered.

Description

Technical Field

[0001] This utility model relates to a triggering mechanism for a limit switch, belonging to the field of power equipment technology. Background Technology

[0002] In power transmission and distribution products, some switchgear (such as high-voltage circuit breakers, high-voltage load switches, high-voltage disconnect switches, and grounding switches) requires the installation of limit switches. The contacts of these limit switches close or open under the drive of the swing arm pressure block on the operating shaft of the switchgear, providing external or remote monitoring or feedback signals to indicate whether the switchgear is in a closed or open operating state. On these switchgear, the driving force for the limit switch contact is a swing arm structure pressure block. This pressure block rotates under the drive of the operating shaft on the switch, pressing down on the limit switch contact to actuate it. When the pressure block rotates back, i.e., leaves the limit switch, the contact resets. However, during actual rotation of the operating shaft, the output angle of the shaft may change beyond its range, causing the swing arm to rotate incompletely or excessively. This can result in the corresponding limit switch contact failing to actuate or directly damaging the limit switch, reducing the reliability of the equipment.

[0003] Therefore, there is an urgent need for a triggering mechanism for limit switches that is simple in structure, has a long lifespan, and is reliable in operation. Summary of the Invention

[0004] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a triggering mechanism for limit switches that is simple in structure, has a long lifespan, and is reliable in operation, so as to avoid situations where the contacts are not in place or are crushed when the limit switch contacts are triggered.

[0005] The purpose of this utility model is achieved as follows:

[0006] A triggering mechanism for a limit switch includes an operating shaft, a trigger block mounted on the operating shaft, and a limit switch that cooperates with the trigger block to monitor the rotation of the operating shaft. The outer contour of the trigger block is a symmetrical curved surface structure, including a first arc, an involute curve and a second arc symmetrically connected to the two ends of the first arc in sequence. The distance between any point on the outer contour of the trigger block and the rotation axis of the trigger block is not greater than the radius of the first arc and not less than the radius of the second arc.

[0007] Furthermore, the involute includes a first involute and a second involute connected end to end, wherein the first involute is connected to the first arc and the second involute is connected to the second arc.

[0008] Furthermore, the curvature of the first involute is less than the curvature of the second involute.

[0009] Furthermore, the outer contour between the two second arcs of the trigger block includes straight lines and chamfers.

[0010] Furthermore, a hollow structure is provided between the outer contour of the trigger block and the internal central hole to save materials.

[0011] Furthermore, the inner wall of the center hole of the trigger block is provided with a limiting block, which is installed in conjunction with the limiting groove on the operating shaft, so that the trigger block rotates with the operating shaft.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention sets the outer contour of the trigger block as a symmetrical arc and involute structure. When the trigger block rotates with the operating shaft, the maximum outer diameter formed by the outer contour can reliably press the contacts of the limit switch in, and the minimum outer diameter can reliably disengage the contacts of the limit switch. This avoids the problem that the corresponding limit switch contacts fail to operate or directly damage the limit switch when the operating shaft rotates too far or too far, thus improving the reliability of equipment operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the triggering mechanism for a limit switch according to the present invention.

[0015] Figure 2 This is a schematic diagram of the rotation radius range of the outer contour of the trigger block of the triggering mechanism for a limit switch according to this utility model.

[0016] in:

[0017] Operating axis 1, trigger pressure block 2, limit switch 3, first arc 4, involute 5, second arc 6, straight line 7, chamfer 8;

[0018] Limiting block 21, first involute 51, second involute 52. Detailed Implementation

[0019] See Figures 1-2 This utility model relates to a triggering mechanism for a limit switch, comprising an operating shaft 1, a triggering block 2 mounted on the operating shaft 1, and a limit switch 3 that cooperates with the triggering block 2 to monitor the rotation of the operating shaft 1. The triggering block 2 has a hollow structure between its outer contour and its internal center hole, saving material, and is integrally injection molded, further reducing manufacturing costs. A limiting block 21 is provided on the inner wall of the center hole of the triggering block 2, which cooperates with a limiting groove on the operating shaft 1, allowing the triggering block 2 to rotate with the operating shaft 1. As the triggering block 2 rotates with the operating shaft 1, its outer contour contacts the contact point of the limit switch 3, generating an electrical signal.

[0020] The outer contour of the trigger block 2 is a symmetrical curved surface structure, including a first arc 4, an involute 5 and a second arc 6 symmetrically connected to both ends of the first arc 4. The involute 5 includes a first involute 51 and a second involute 52 connected end to end, wherein the curvature of the first involute 51 is less than the curvature of the second involute 52. The first involute 51 is connected to the first arc 4, and the second involute 52 is connected to the second arc 6. That is, two involutes with increasing curvature are set between the first arc 4 and the second arc 6 for transition, so that the outer contour of the trigger block 2 contacts the limit switch 3 contact point more smoothly, avoiding excessive wear of the contact point and improving its service life. In other embodiments, the involute 5 can be an involute with a single curvature, or two or more involutes with increasing curvature to achieve the transition from the first arc 4 to the second arc 6.

[0021] The outer contour between the two second arcs 6 of the trigger block 2 includes a straight line 7 and a chamfer 8; the distance between any point on the outer contour of the trigger block 2 and the rotation axis of the trigger block 2 is not greater than the radius R of the first arc 4 and not less than the radius r of the second arc 6. That is, the rotation paths of the first arc 4, the involute 5, the second arc 6, the straight line 7, and the chamfer 8 are all located within an annular region with R as the outer diameter and r as the inner diameter, and the contact travel range of the limit switch 3 should not be less than Rr;

[0022] Therefore, when the rotation angle of the operating shaft 1 is abnormal, such as incomplete or excessive rotation, the outer contour of the trigger block 2 will never exceed the contact travel range of the limit switch 3, thus avoiding the problem of incomplete contact or damage to the contact when the limit switch 3 is triggered. The device has a simple overall structure, long limit switch life, and stable and reliable operation.

[0023] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A triggering mechanism for a limit switch, comprising an operating shaft (1), a triggering block (2) mounted on the operating shaft (1), and a limit switch (3) cooperating with the triggering block (2) to monitor the rotation of the operating shaft (1), characterized in that: The outer contour of the trigger block (2) is a symmetrical curved surface structure, including a first arc (4), an involute (5) and a second arc (6) symmetrically connected to the two ends of the first arc (4); the distance between any point on the outer contour of the trigger block (2) and the rotation axis of the trigger block (2) is not greater than the radius of the first arc (4) and not less than the radius of the second arc (6).

2. The triggering mechanism for a limit switch according to claim 1, characterized in that: The involute (5) includes a first involute (51) and a second involute (52) connected end to end, wherein the first involute (51) is connected to the first arc (4) and the second involute (52) is connected to the second arc (6).

3. The triggering mechanism for the limit switch according to claim 2, characterized in that: The curvature of the first involute (51) is less than that of the second involute (52).

4. The triggering mechanism for a limit switch according to claim 1, characterized in that: The outer contour between the two second arcs (6) of the trigger block (2) includes a straight line (7) and a chamfer (8).

5. The triggering mechanism for a limit switch according to claim 1, characterized in that: The outer contour of the trigger block (2) and the inner center hole are provided with a hollow structure to save materials.

6. The triggering mechanism for a limit switch according to claim 1, characterized in that: The inner wall of the center hole of the trigger block (2) is provided with a limiting block (21), which is installed in conjunction with the limiting groove on the operating shaft (1) so that the trigger block (2) rotates with the operating shaft (1).

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