Limit switch shock protection device

Abstract

This utility model discloses an anti-shock device for limit switches, including a housing, a push rod at the center of the lower end of the housing, a mounting cavity in the housing, a push rod that extends movably into the mounting cavity at the upper end of the housing, a buffer groove at the lower end of the push rod, a mounting seat at the lower end of the mounting cavity, a return spring between the buffer groove and the mounting seat, a spring plate surrounding the return spring at the upper end of the mounting seat, a locking block on the upper outer wall of the spring plate, and a sliding groove and a positioning groove on the inner wall of the buffer groove that adapt to the locking block, with the lower end of the sliding groove communicating with the positioning groove. The beneficial effects of this utility model are: it effectively solves the problem of limit switch damage caused by excessive travel of moving parts, and facilitates timely detection of overtravel by operators, thereby enabling timely equipment maintenance.

Description

Technical Field

[0001] This utility model relates to the field of limit switch technology, and in particular to a limit switch anti-impact device. Background Technology

[0002] Limit switches typically use the impact of moving mechanical parts to actuate their contacts, thereby connecting or disconnecting control circuits to achieve control purposes. Because limit switches control the circuit by actuating the contacts through impact, in the event of a malfunction or inertia in the moving parts, overtravel can occur, causing the contacts to fail to stop promptly after their travel, resulting in contact damage and failure. Therefore, shock-resistant devices are often installed to prevent damage caused by overtravel. However, existing shock-resistant devices have simple structures; while they can protect the contacts, overtravel of the moving parts is difficult to detect in a timely manner. Prolonged abnormal operation of the equipment also affects the service life of the shock-resistant device. Utility Model Content

[0003] The purpose of this invention is to provide a limit switch anti-shock device to solve the problem that existing anti-shock devices have simple structures and that it is difficult to detect overtravel of moving parts in a timely manner.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] The limit switch anti-shock device includes a housing, a push rod at the center of the lower end of the housing, an opening in the housing for a mounting cavity, a push rod that extends movably into the mounting cavity at the upper end of the housing, a buffer groove at the lower end of the push rod, a mounting seat at the lower end of the mounting cavity, a return spring between the buffer groove and the mounting seat, a spring plate surrounding the return spring at the upper end of the mounting seat, a locking block on the upper outer wall of the spring plate, and a sliding groove and a positioning slot adapted to the locking block on the inner wall of the buffer groove, with the lower end of the sliding groove communicating with the positioning slot.

[0006] Furthermore, the lower end of the push rod is provided with a flared mouth with a gradually increasing diameter, and the inner wall of the flared mouth is provided with a compression protrusion adapted to the spring.

[0007] Furthermore, the housing includes an upper housing and a lower housing. The lower end of the upper housing has an upper mounting cavity, and the upper end of the lower housing has a lower mounting cavity. The upper and lower mounting cavities constitute a mounting cavity. The upper and lower housings are threaded together. The upper end of the upper housing has a through hole for a push rod, and the lower end of the lower housing has a push rod at its center.

[0008] Furthermore, the lower end of the mounting base is threadedly connected to the bottom wall of the lower mounting cavity.

[0009] Furthermore, a limiting groove is provided on the inner side wall of the upper housing, and a slider adapted to the limiting groove is provided on the outer side wall of the push rod.

[0010] Furthermore, the length of the limiting slide is the same as the length of the slide.

[0011] This utility model has the following advantages:

[0012] It can effectively solve the problem of limit switch damage caused by the excessive travel of moving parts, making it easier for staff to detect overtravel of moving parts in a timely manner, thereby enabling timely equipment maintenance. Attached Figure Description

[0013] Figure 1 This is an exploded view of the structure of this utility model.

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] In the diagram, 1-top rod, 2-push rod, 3-buffer groove, 4-mounting base, 5-reset spring, 6-spring sheet, 7-block, 8-slide groove, 9-positioning slot, 10-flare mouth, 11-extrusion protrusion, 12-upper housing, 13-lower housing, 14-upper mounting cavity, 15-lower mounting cavity, 16-fixing screw, 17-operating hole, 18-limiting slide groove, 19-slider, 20-threaded hole. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] For example, in the existing shock-absorbing device with application number 202121224041.0, if an external moving part moves beyond its travel limit during use, the push rod will continue to move along the guide groove of the top rod, compressing the buffer spring, until the operating rod completes its travel, thus providing shock protection. Because the movement process is relatively smooth, it is difficult for external observers to see if the moving part has moved beyond its travel limit, making timely maintenance and adjustment of the equipment (moving part) impossible. This results in the equipment being in an abnormal operating state for a long time, which also affects the service life of the shock-absorbing device. This application improves the shock-absorbing device by adopting a spring-loaded snap-fit ​​structure design, making it easier for operators to detect over-travel of the moving part in a timely manner, thereby enabling timely maintenance of the equipment. See details for further reference. Figure 1 , 2 As shown, one embodiment of this utility model is as follows:

[0023] The limit switch anti-shock device includes a housing, a push rod 1 at the center of the lower end of the housing, an opening in the housing for a mounting cavity, a push rod 2 that extends movably into the mounting cavity at the upper end of the housing, a buffer groove 3 at the lower end of the push rod 2, a mounting seat 4 at the lower end of the mounting cavity, a return spring 5 between the buffer groove 3 and the mounting seat 4, a spring plate 6 surrounding the return spring 5 at the upper end of the mounting seat 4, a locking block 7 on the upper outer wall of the spring plate 6, and a sliding groove 8 and a positioning groove 9 adapted to the locking block 7 on the inner wall of the buffer groove 3, with the lower end of the sliding groove 8 communicating with the positioning groove 9.

[0024] like Figure 2As shown, during normal operation, the locking block 7 outside the spring 6 is engaged in the positioning slot 9, and the return spring 5 is in a naturally extended state. When the external moving parts move, due to the cooperation between the locking block 7 and the positioning slot 9, the entire anti-impact device moves towards the contact of the limit switch, thereby disconnecting the circuit. When the external moving parts move beyond their travel range, the housing cannot move due to the limit switch's restriction. At this time, the push rod 2 continues to move forward, thereby squeezing the spring 6 and causing the locking block 7 to engage in the slide groove 8 from the positioning slot 9. The return spring 5 is in a compressed state. Since the locking block 7 is not smoothly engaged in the slide groove 8 from the positioning slot 9, the instantaneous resistance is relatively large. This is reflected in the movement of the push rod 2 as a movement-jamming-movement state change. The movement of the external moving parts will also experience a brief jamming, allowing the operator to promptly detect any abnormalities in the moving parts. Meanwhile, during the reset process, the reset spring 5 drives the push rod 2 to move backward, that is, the locking block 7 moves in the slide groove 8 towards the positioning slot 9, and the spring 6 is in an inward pressing state, so that the locking block 7 is ejected from the slide groove 8 into the positioning slot 9, making a loud collision sound, so that the staff can detect the abnormality in time.

[0025] In practical implementation, to ensure impact resistance and to facilitate the detection of abnormal conditions by staff, three springs 6 are preferably evenly distributed on the mounting base 4. The spacing between adjacent springs should be ensured, and the springs 6 should not come into contact with each other when the locking block 7 moves in the slide groove 8. To ensure that the locking block 7 can smoothly engage in the slide groove 8 and slide smoothly, its upper end face and outer side face are provided with arc-shaped surfaces.

[0026] Furthermore, to facilitate the smooth insertion of the spring 6 into the buffer groove during installation, the lower end of the push rod is a flared opening 10 with a gradually increasing diameter. To further enable the locking block 7 to smoothly insert into the sliding groove 8, the inner wall of the flared opening 10 is provided with a pressing protrusion 11 adapted to the spring 6. The end face of the pressing protrusion 11 is a spherical surface to better press the spring 6 inward.

[0027] For ease of installation, the housing adopts a segmented design, specifically including an upper housing 12 and a lower housing 13. The lower end of the upper housing 12 has an upper mounting cavity 14, and the upper end of the lower housing 13 has a lower mounting cavity 15. The upper mounting cavity 14 and the lower mounting cavity 15 constitute the mounting cavity. The upper housing 12 and the lower housing 13 are threaded together. The upper end of the upper housing 12 has a through hole for the push rod 2, and the lower end of the lower housing 13 has a push rod 1 at its center.

[0028] The lower end of the mounting base 4 is threadedly connected to the bottom wall of the lower mounting cavity 14.

[0029] The segmented design of the housing facilitates the assembly and mating of the push rod 2, mounting base 4, and spring 6. The threaded connection method is simple in structure and easy to implement.

[0030] Specifically, in this embodiment, the lower end of the mounting base 4 is provided with a fixing screw 16, and the bottom wall of the lower mounting cavity is provided with a screw hole adapted to the fixing screw. For ease of installation, the upper end of the mounting base 4 is provided with an operating hole 17, so that an external operating lever (such as an Allen wrench) can be inserted into the operating hole 17, thereby rotating the mounting base 4 to achieve the engagement of the fixing screw 16 with the screw hole.

[0031] The threaded connection is simple to operate, but it may loosen during long-term use. To further improve stability and increase the impact sound during reset, this embodiment has a limiting groove 18 on the inner side wall of the upper housing 12, and a slider 19 adapted to the limiting groove 17 is provided on the outer side wall of the push rod 2.

[0032] By using the limiting groove 18 and the slider 19 together, the rotation of the push rod 2 is restricted. Combined with the restraining effect of the locking block 7, the groove 8, and the positioning slot 9, the rotation of the mounting base 4 is effectively prevented, resulting in better stability. Simultaneously, the length of the limiting groove 18 is the same as the length of the groove 8. When the slider 7 engages with the positioning slot, the end of the slider 19 contacts the limiting groove 18. That is, when the locking block 7 springs from the groove 8 into the positioning slot 9, there is not only a collision sound between the spring 6, the slider 7, and the push rod 2, but also a collision sound between the slider 19 and the upper housing 12. This makes it easier for operators to detect abnormal conditions such as overtravel of moving parts.

[0033] After setting the limiting groove 18 and the slider 19, the upper housing 12 and the lower housing 13 cannot rotate relative to each other. Therefore, the threaded connection between the upper housing 12 and the lower housing 13 is achieved by setting mutually mating threaded holes 20 on the mating surfaces of the upper housing 12 and the lower housing 13, and by using fixing bolts to fit the threaded holes 20 to achieve the installation and fixation of the upper housing 12 and the lower housing 13.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A trip switch anti-bump device, characterized by: The device includes a housing, a push rod at the center of its lower end, a mounting cavity, a push rod that extends movably into the mounting cavity at the upper end of the housing, a buffer groove at the lower end of the push rod, a mounting seat at the lower end of the mounting cavity, a return spring between the buffer groove and the mounting seat, a spring plate surrounding the return spring at the upper end of the mounting seat, a locking block on the upper outer wall of the spring plate, and a sliding groove and a positioning slot on the inner wall of the buffer groove that adapt to the locking block. The lower end of the sliding groove communicates with the positioning slot.

2. The limit switch anti-shock device according to claim 1, characterized in that: The lower end of the push rod is provided with a flared mouth with a gradually increasing diameter, and the inner side wall of the flared mouth is provided with a compression protrusion adapted to the spring.

3. The shock trip device of claim 1, wherein: The housing includes an upper housing and a lower housing. The lower end of the upper housing has an upper mounting cavity, and the upper end of the lower housing has a lower mounting cavity. The upper mounting cavity and the lower mounting cavity constitute the mounting cavity. The upper housing and the lower housing are threaded together. The upper end of the upper housing has a through hole adapted to the push rod, and the lower end of the lower housing has the top rod at its center.

4. The shock trip device of claim 3, wherein: The lower end of the mounting base is threadedly connected to the bottom wall of the lower mounting cavity.

5. The shock trip device of claim 3, wherein: The inner wall of the upper housing is provided with a limiting groove, and the outer wall of the push rod is provided with a slider that is adapted to the limiting groove.

6. The shock trip device of claim 5, wherein: The length of the limiting slide is the same as the length of the slide.

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