CN205264576U

CN205264576U - Pull -cord switch

Info

Publication number: CN205264576U
Application number: CN201521015694.2U
Authority: CN
Inventors: 张峰; 杨振祥
Original assignee: Tianjin Iron and Steel Group Co Ltd
Current assignee: Tianjin Iron and Steel Group Co Ltd
Priority date: 2015-12-09
Filing date: 2015-12-09
Publication date: 2016-05-25
Anticipated expiration: 2025-12-09

Abstract

The utility model relates to a pull -cord switch, including upper cover, lower cover, a sealed rubber ring, the 2nd sealed rubber ring, micro -gap switch, cam, stay cord arm, electric wire, pull -cord switch base, wherein, the lower cover passes through fastener fixed mounting on the pull -cord switch seat, and the inner chamber fixed mounting of lower cover has micro -gap switch, and micro -gap switch connecting wire, micro -gap switch's contact and cam contact, cam pass through the actuating lever and install in the inner chamber of lower cover, and the lower extreme of actuating lever stretches out the lower cover, installs the stay cord arm on the actuating lever that stretches out, upper cover and lower cover threaded connection are equipped with recess, the embedded sealed rubber ring that adorns of recess in the bottom of upper cover inner chamber, the cover is equipped with the 2nd sealed rubber ring on the outer circumference of lower cover. Above -mentioned structure prevents that the rainwater from diping pull -cord switch's inside along the gap, play the guard action to the screw thread, the mechanism of all actions of micro -gap switch simultaneously reduces external damage or destroys all in the below of intact fully enclosed upper cover, has prolonged long service life.

Description

A kind of pull switch

Technical field

The utility model design belongs to belt feeder equipment technical field, particularly relates to a kind of pull switch.

Background technology

Pull switch, is commonly called as " emergency shutdown " switch, when acting on ribbon conveyer scene and need to shutting down, passes through switchAction is shut down conveyer. Pull switch divides and automatically resets and two kinds of hand-resets, is that ribbon conveyer is protected than standby safetyProtection unit, Accident prevention expands and brings heavy losses. In the time of conveyer belt apparatus generation emergency episode, appoint along the line at the sceneMeaning pulls steel wire rope, steel wire rope to affect actuating arm rotation, and while driving torque spring by power transmission shaft, precision cam is subjected to displacement,Drive microswitch, cutting-off controlling circuit, makes conveyer out of service. Due to easy for installation, use in theory reliably,Be widely used at belt conveying scene.

Under ideal state, this design is more ripe, also simple and sensitive of the control of switch.

But, in actual production because the impact of the factors such as design own, site environment, bad weather, pull switchMalfunctioning phenomenon is more, and following fault especially easily occurs:

1, when steel wire rope affects actuating arm rotation, actuating arm rotates malfunctioning, and pull switch is stuck, cannot normally act on.

2, run into snow melt and particularly rain when situation, pull switch and the phenomenon of reporting to the police malfunctioning because electrical grounding phenomenon causesA lot. When site inspection pull switch, most cases is all because pull switch is because the reason of seal failure causes switchInner inlet short circuit, opens pull switch inside when severe situation, and the rainwater that nearly space of half is all infiltered soaks.

Above-mentioned situation is once occur, it is out of service that pull switch can be controlled belt feeder at once, produces corresponding stopping. MaintenancePersonnel's reason of fixing a breakdown of reaching the spot, reason is usually because pull switch itself causes.

The object of its design of pull switch itself is the safe operation in order to ensure belt feeder, the actual result using but due toThe false alarm of itself and control bring burden to the production operation of sealing-tape machine.

Summary of the invention

The utility model for solve the technical problem existing in known technology provide a kind of simple in structure, easy to install,The pull switch that can effectively avoid above-mentioned accident to occur.

The technical scheme that the utility model is taked for the technical problem existing in solution known technology is:

A kind of pull switch, comprise upper cover, lower cover, the first O-ring seal, the second O-ring seal, microswitch, cam,Pulling arm, electric wire, pull switch base; Wherein, described lower cover is fixedly mounted on pull switch seat by securing member,The inner chamber of described lower cover is installed with microswitch, and described microswitch connects electric wire, the contact of described microswitch withCam contact, described cam is arranged on by drive rod in the inner chamber of lower cover, and lower cover is stretched out in the lower end of described drive rod,On the drive rod stretching out, pulling arm is installed; Described upper cover is threaded with lower cover, is provided with groove in the bottom of upper cover cavity,Setting-in the first O-ring seal in described groove; On the excircle of lower cover, be set with the second O-ring seal.

Advantage and the good effect that the utlity model has are: because the utility model adopts technique scheme, upper and lowerThe design of the end cap of direction makes rainwater water while dropping on pull switch can very fast flowing away, and prevents that rainwater is along gapThe inside of immersing pull switch, the design of O-ring seal also can effectively stop entering of dust and rainwater, double thread risesTo protective effect. The utility model simplicity of design, the mechanism of everything has all been placed in the below of totally enclosed upper cover,The design defect of prior art has been avoided in the design of this structure, makes and safeguard simple, long service life.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model.

In figure: 1, upper cover; 2, lower cover; 3, the first O-ring seal; 4, the second O-ring seal; 5, microswitch; 6,Cam; 7, pulling arm; 8, electric wire; 9, pull switch base; 10, drive rod.

Detailed description of the invention

For further understanding summary of the invention of the present utility model, Characteristic, hereby exemplify following examples, and coordinateAccompanying drawing is described in detail as follows:

Refer to Fig. 1, a kind of pull switch, comprise upper cover 1, lower cover 2, the first O-ring seal 3, the second O-ring seal 4,Microswitch 5, cam 6, pulling arm 7, electric wire 8, pull switch base 9; Wherein, described lower cover 2 is by fasteningPart is fixedly mounted on pull switch seat, and the inner chamber of described lower cover is installed with microswitch, and described microswitch connectsElectric wire 8, the contact of described microswitch contacts with cam 6, and described cam is arranged on the inner chamber of lower cover by drive rod 10In, lower cover 2 is stretched out in the lower end of described drive rod, on the drive rod stretching out, pulling arm is installed; Described upper cover and lower cover spiral shellLine connects, and is provided with groove in the bottom of upper cover cavity, setting-in the first O-ring seal 3 in described groove; At the excircle of lower coverOn be set with the second O-ring seal 4.

Adopt technique scheme, i.e. the design of the end cap of above-below direction make rainwater water while dropping on pull switch passableVery fast flows away, and prevents that rainwater from immersing the inside of pull switch along gap, and the design of O-ring seal also can effectively hinderEntering of dust-break soil and rainwater, double thread plays a protective role. The utility model simplicity of design, the mechanism of everything allBe placed in the below of totally enclosed upper cover, the design defect of prior art has been avoided in the design of this structure, makes and dimensionProtect simple, long service life.

The above is only to preferred embodiment of the present utility model, not the utility model is done any pro formaRestriction, every foundation technical spirit of the present utility model is to any simple modification made for any of the above embodiments, equivalent variations withModify, all belong in the scope of technical solutions of the utility model.

Claims

1. a pull switch, comprises upper cover (1), lower cover (2), the first O-ring seal (3), the second O-ring seal (4), microswitch (5), cam (6), pulling arm (7), electric wire (8), pull switch base (9); Wherein, described lower cover (2) is fixedly mounted on pull switch seat by securing member, the inner chamber of described lower cover is installed with microswitch, described microswitch connects electric wire, the contact of described microswitch contacts with cam (6), described cam is arranged in the inner chamber of lower cover by drive rod (10), and lower cover (2) is stretched out in the lower end of described drive rod, on the drive rod stretching out, pulling arm is installed; Described upper cover is threaded with lower cover, is provided with groove in the bottom of upper cover cavity, setting-in the first O-ring seal (3) in described groove; On the excircle of lower cover, be set with the second O-ring seal (4).