Wireless limit switch

Abstract

The utility model provides a wireless limit switch, include: first casing and second casing of opposite setting, the first casing and second casing opposite position is provided with the mounting hole that contains telescopic rod passes through, the first casing and second casing form the sealed space containing contact switch, telescopic spring is sheathed on the telescopic rod, be connected with trigger pressure block on the telescopic rod, the telescopic rod slide can trigger switch, telescopic spring is used for drive telescopic rod to slide and leave switch. Switch main casing adopts injection moulding, and the strength is reliable, is more light and breezy. Contact switch is installed in the inside of first casing and second casing, and contact switch top contact head is completely wrapped in, avoids the corrosion, the problem of contact bad of contact head by water, mud, dust and other factors, prolongs the life.

Description

Technical Field

[0001] This utility model relates to the field of wireless limit switch technology, and particularly to wireless limit switches. Background Technology

[0002] Due to their ease of movement, high load-bearing capacity, and high reliability, mobile aerial work platforms have gradually replaced traditional scaffolding in various construction sites in recent years. Using aerial work platforms not only allows for easy height adjustment, but the lifting platform can also be used to place various construction tools, effectively reducing the time spent retrieving tools and improving tool placement safety. However, due to their automatic lifting characteristics, the lifting platform may collide with objects during the lifting process due to over-lifting. To prevent collisions, aerial work platform limiters have begun to appear on the market. These limiters mainly consist of a housing fixedly installed on the lifting platform's guardrail, a top rod vertically sliding on one side of the housing, a switch located on one side of the housing, and a spring to help the top rod return to its original position. When the top of the top rod collides with an object, the top rod will slide down and trigger the switch, which will cut off the power to the aerial work platform, stopping the lifting platform from rising and thus serving as a warning.

[0003] However, the switches of existing high-altitude limit switches are usually exposed outside the housing. During use, the switches are easily damaged by impacts from foreign objects, affecting the service life of the high-altitude limit switches. The limit switch contacts are not effectively protected and are easily covered and corroded by water, mud, sand and dust, which also affects the service life. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a wireless limit switch, comprising:

[0005] The first housing and the second housing are arranged opposite each other, and the first housing and the second housing are provided with mounting holes at opposite positions to accommodate the passage of the telescopic rod. The first housing and the second housing form a sealed space to accommodate the contact switch. The telescopic rod is fitted with a telescopic spring and a trigger block is connected to the telescopic rod. The telescopic rod can trigger the switch by sliding down, and the telescopic spring is used to drive the telescopic rod to slide up and disengage from the switch.

[0006] Preferably, the second housing has a mounting ear on the side away from the first housing, and the mounting ear is provided with a mounting screw.

[0007] Preferably, a detachable limiting clamp is provided between the telescopic rod and the second housing.

[0008] Preferably, a steel wire rope is connected to the limiting clamp, and the other end of the steel wire rope is connected to the second housing.

[0009] Preferably, the inner wall of the mounting hole is provided with an upper limit and a lower limit to protect the contact switch from physical damage during the triggering process.

[0010] Preferably, the telescopic rod is hollow, and a PVC extension tube is installed inside the telescopic rod.

[0011] Preferably, a set screw is provided at the top end of the telescopic tube, and the set screw is used to fix the PVC extension tube.

[0012] Preferably, the contact switch is a wireless contact switch.

[0013] Preferably, the bottom of the first housing and the second housing are provided with cable outlet holes.

[0014] Preferably, the second housing has a side hole for side locking.

[0015] Beneficial effects of this utility model

[0016] This utility model provides a wireless limit switch, which adopts a wireless contact switch, has stable triggering, and does not require wiring;

[0017] The main housing of the switch is injection molded, ensuring reliable strength and a lighter weight. The contact switch is installed inside the first and second housings, completely enclosing the top contact head. This prevents corrosion and poor contact caused by water, mud, dust, and other factors, extending the service life.

[0018] The inner wall of the mounting hole is equipped with an upper limit and a lower limit to protect the contact switch from physical damage during the triggering process, making the triggering process more reliable.

[0019] A detachable clamp limit switch is provided. During transportation or other processes where the wireless limit switch is not required, the clamp limit switch is used to prevent accidental triggering and battery drain. At the same time, one end of the clamp is connected to a steel wire rope, which is screwed to the metal housing to prevent the clamp from being lost when not in use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0022] The components include: 1. First housing; 2. Second housing; 3. Mounting hole; 4. Telescopic rod; 5. Telescopic spring; 6. Trigger switch; 7. Trigger block; 8. Fastening screw; 9. Mounting ear; 10. Mounting screw; 11. Limiting clamp; 12. Wire rope; 13. Outlet hole; 14. Side hole. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0024] Reference Figures 1-2

[0025] This utility model provides a wireless limit switch, comprising: a first housing 1 and a second housing 2 arranged opposite to each other. The first housing 1 and the second housing 2 have mounting holes 3 at opposite positions to accommodate a telescopic rod 4. The first housing 1 and the second housing 2 form a sealed space for accommodating a contact switch. A mounting base for mounting the contact switch is provided within the space. The telescopic rod 4 is vertically arranged, and a telescopic spring 5 is sleeved on the telescopic rod 4. A trigger block 7 is connected to the telescopic rod 4. The telescopic rod 4 sliding down triggers a switch 6, and the telescopic spring 5 drives the telescopic rod 4 to slide upwards, disengaging from the switch. The first housing 1 and the second housing 2 are fixedly installed as a whole by screws.

[0026] When in use, install the entire unit on the top guardrail of the aerial work platform, then insert the PVC extension pipe into the telescopic rod 4, and tighten the fastening screw 8 so that the top of the extension pipe is higher than the operator's head.

[0027] During the ascent of the aerial work platform, if the PVC extension pipe locked by the wireless limit switch encounters an obstacle, it will cause the telescopic rod 4 to move downwards, compressing the telescopic spring 5 and triggering the contact switch below to cut off the circuit, stopping the ascent of the aerial work platform and protecting the operator's safety. When the aerial work platform descends, the telescopic spring 5 returns to its original position, causing the telescopic rod 4 to disengage from the contact switch, restoring the ascent function to normal.

[0028] Furthermore, the second housing 2 is provided with a mounting ear 9 on the side away from the first housing 1, and a mounting screw 10 is provided on the mounting ear 9. The mounting ear 9 is hung on the top guardrail, and the mounting screw 10 passes through the guardrail and is locked with a nut, so that the limit switch is fixedly clamped on the guardrail.

[0029] Furthermore, a detachable limiting clamp 11 is provided between the telescopic rod 4 and the second housing 2. The clamp is used for limiting the movement during transportation or other processes where the wireless limit switch is not required, preventing accidental triggering and battery drain.

[0030] Furthermore, a steel wire rope 12 is connected to the limiting clamp 11, and the other end of the steel wire rope 12 is connected to the second housing 2. The steel wire rope 12 is locked to the second housing 2 with screws to prevent the clamp from being lost when not in use.

[0031] Furthermore, the inner wall of the mounting hole 3 is provided with an upper limit and a lower limit to protect the contact switch from physical damage during the triggering process.

[0032] Furthermore, the telescopic rod 4 is hollow, and a PVC extension tube is installed inside the telescopic rod 4.

[0033] Furthermore, a set screw is provided at the top end of the telescopic tube. The set screw is a butterfly bolt and is used to fix the PVC extension tube.

[0034] Furthermore, the contact switch is a wireless contact switch, which protects the contact switch from physical damage during the triggering process.

[0035] Furthermore, the bottom of the first housing 1 and the second housing 2 are provided with a wire outlet hole 13, which can be compatible with linear limit switches and improve the interchangeability of the products.

[0036] Furthermore, the second housing 2 has a side hole 14 on its side for side locking, which can adapt to various installation scenarios.

[0037] Beneficial effects of this utility model

[0038] This utility model provides a wireless limit switch, which adopts a wireless contact switch, has stable triggering, and does not require wiring;

[0039] The main housing of the switch is injection molded, ensuring reliable strength and a lighter weight. The contact switch is installed inside the first housing 1 and the second housing 2, completely enclosing the top contact head of the contact switch. This prevents corrosion and poor contact caused by water, mud, dust, and other factors, thus extending the service life.

[0040] The inner wall of the mounting hole 3 is provided with an upper limit and a lower limit to protect the contact switch from physical damage during the triggering process, making the triggering process more reliable.

[0041] A detachable clamp limit switch is provided. The clamp limit switch is used during transportation and other processes where the wireless limit switch is not required to prevent accidental triggering and battery drain. At the same time, one end of the clamp is connected to a steel wire rope 12, which is screwed onto the metal housing to prevent the clamp from being lost when not in use.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0045] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A wireless limit switch, characterized in that, include: The first housing and the second housing are arranged opposite each other. The first housing and the second housing are provided with mounting holes at opposite positions to accommodate the passage of the telescopic rod. The first housing and the second housing form a sealed space to accommodate the contact switch. The telescopic rod is fitted with a telescopic spring and a trigger block is connected to the telescopic rod. The telescopic rod can trigger the switch by sliding down. The telescopic spring is used to drive the telescopic rod to slide up and disengage from the switch.

2. The wireless limit switch according to claim 1, characterized in that, The second housing has a mounting ear on the side away from the first housing, and a mounting screw is provided on the mounting ear.

3. The wireless limit switch according to claim 1, characterized in that, A detachable limiting clamp is provided between the telescopic rod and the second housing.

4. The wireless limit switch according to claim 3, characterized in that, A steel wire rope is connected to the limiting clamp, and the other end of the steel wire rope is connected to the second housing.

5. The wireless limit switch according to claim 1, characterized in that, The inner wall of the mounting hole is provided with an upper limit and a lower limit to protect the contact switch from physical damage during the triggering process.

6. The wireless limit switch according to claim 1, characterized in that, The telescopic rod is hollow, and a PVC extension tube is installed inside the telescopic rod.

7. The wireless limit switch according to claim 6, characterized in that, The top end of the telescopic rod is provided with a set screw, which is used to fix the PVC extension pipe.

8. The wireless limit switch according to claim 1, characterized in that, The contact switch is a wireless contact switch.

9. The wireless limit switch according to claim 1, characterized in that, The bottom of the first and second housings is provided with a cable outlet hole.

10. The wireless limit switch according to claim 1, characterized in that, The second housing has a side hole for side locking.

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