CN211769587U - Improved lower limit switch trigger device of construction elevator - Google Patents

Abstract

The utility model discloses a limit switch trigger device under modified construction elevator, it includes limiting plate and lever mechanism, lever mechanism includes lever and lever support, and the middle part of lever is articulated to be installed on lever support, the preceding tip of lever is located limiting plate descending path, and the pole body of the rear end side of lever is located down limit switch's contact top and down limit switch's contact is located the push down route of the pole body of the rear end side of lever, installs a balancing weight on the tip behind the lever. When the limiting plate that the car rises leaves the lever gradually, the lever receives the action of gravity of balancing weight to push down limit switch contact, triggers limit switch down, its simple structure, and sensitive reliable has eliminated the vibration and the impact force of limiting plate with the direct striking of limit switch contact down, has prolonged limit switch's life, has reduced construction machinery's use cost, has ensured the safety in production.

Description

Improved lower limit switch trigger device of construction elevator

Technical Field

The utility model relates to an elevator equipment especially relates to a limit switch trigger device under modified construction elevator.

Background

The old construction elevator is provided with a lower limit switch at the lower limit position of the descending car in the elevator shaft, and is provided with a lower limit switch trigger element to be matched with a control system to control the positive and negative rotation of the motor. The lower limit switch triggering element is a limit plate 1 'installed outside the car 10, as shown in fig. 1, when the car 10 descends to the lowest point, the limit plate 1' collides with a contact 201 'of a limit switch 20', the motor positive rotation motor is set to ascend, the motor negative rotation motor descends, at the moment, the control system sends a command to enable the lifting motor to only positively rotate but not reversely rotate, the car is only ascended but not descended during the lower limit, and therefore the car is prevented from falling. Because this trigger mechanism designs the contact that the limiting plate directly strikes limit switch, and the vibrational force and the impact force of car are great, lead to limit switch very easily to damage, change frequently, not only increase the cost to threaten constructor's safety, influence the construction progress.

Disclosure of Invention

An object of the utility model is to provide a limit switch trigger device under modified construction elevator.

Realize the utility model discloses the technical scheme of purpose is: an improved lower limit switch trigger device of a construction elevator comprises a limit plate, wherein the limit plate is arranged outside a car, a lower limit switch in communication connection with a controller is arranged on a platform of an elevator shaft at the lower limit position of the car, and the lower limit switch is provided with a contact arranged on the side surface of the lower limit switch; the lower limit switch triggering device further comprises a lever mechanism arranged on a platform where the lower limit switch is arranged, the lever mechanism comprises a lever support and a lever, the middle part of the lever is hinged to the lever support, the front end part of the lever is positioned on a descending path of the limit plate, a rod body on the rear end side of the lever is positioned above a contact of the lower limit switch, the contact of the lower limit switch is positioned on a downward pressing path of the rod body on the rear end side of the lever, a balancing weight is arranged on the rear end part of the lever, and the weight of the balancing weight is limited by the fact that the rear end side of the lever can descend when the lever is not affected by external force and the contact of the lower limit switch is; when the limiting plate descends along with the car and touches the front end of the lever, the rod body of the lever leaves the contact, the lower limiting switch is in a disconnected state, the controller sends out an instruction to the car lifting motor to enable the car lifting motor to be in a steering state which can only control the car to ascend, and the car stops descending; when the lift car ascends, the limit plate gradually leaves the rod body of the lever, the rear end side of the lever drops to be contacted with the contact of the lower limit switch under the action of the gravity of the balancing weight and keeps the rod body of the lever to press the contact of the lower limit switch, and when the lower limit switch is triggered due to the fact that the contact is pressed downwards, the lift car lifting motor can rotate forwards or reversely under the instruction of the controller.

Further, the pole body below between limit switch and the balancing weight is installed to the platform under, lever stop mechanism includes screw base and adjusting screw, adjusting screw fixed mounting is on the upper surface of screw base and lie in the lower pressure route of the pole body of lever rear end side, and the surface height value of adjusting screw's upper surface is a little higher than the surface height value of the extreme low position that the contact of limit switch sinks to trigger down and locates behind the limit switch. The pressure applied to the lower limit switch by the lever can be controlled by additionally arranging the lever limit mechanism, and the contact is prevented from exceeding the lower limit value of the lower pressure and being damaged.

The utility model adds the lever mechanism and cooperates with the instruction change of the control system to keep the rod body of the lever to press the contact of the lower limit switch when the lever is not acted by external force, the lower limit switch is triggered because the contact is pressed down, and the lift car lifting motor can rotate forward or reversely under the instruction of the controller; when the limiting plate descends along with the car to touch the front end of the lever and enable the front end of the lever to be in contact with the surface of the platform, the rod body of the lever leaves the contact, the lower limiting switch is in an off state, and the controller sends out an instruction to the car lifting motor to enable the car lifting motor to be in a steering state only capable of controlling the car to ascend. The lower limit switch has the advantages of simple structure, sensitivity and reliability, elimination of vibration and impact force caused by direct impact of the limiting plate and the lower limit switch contact, prolongation of the service life of the lower limit switch, reduction of the use cost of construction machinery and guarantee of safety production.

Drawings

FIG. 1 is a schematic structural diagram of a trigger element of a lower limit switch of a construction elevator in the background art when the trigger element is in contact with a contact;

fig. 2 is a schematic structural view of a limiting plate of the triggering device of the limiting switch under the construction elevator according to the embodiment of the present invention when contacting with a lever;

fig. 3 is a schematic structural view of the lower limit switch triggering device of the construction elevator according to the embodiment of the present invention when the lever contacts with the contact, wherein the contact indicated by the dotted line represents the lowest position where the contact sinks to trigger the lower limit switch;

wherein the arrow represents the car movement direction.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 2 to 3, an improved lower limit switch triggering device for a construction elevator comprises a limit plate 1 and a lever mechanism 2, wherein the limit plate 1 is installed outside a car 10, a lower limit switch 20 in communication connection with a controller (not shown) is installed on a platform 100 of an elevator shaft at the lower limit of the car 10, and the lower limit switch 20 is provided with a contact 201 installed on the side surface of the lower limit switch; the lever mechanism 2 comprises a lever support 21 and a lever 22, the middle part of the lever 22 is hinged on the lever support 21, the front end part 221 of the lever 22 is positioned on a descending path of the limit plate 1, a rod 222 on the rear end side of the lever 22 is positioned above a contact 201 of the lower limit switch 20, the contact 201 of the lower limit switch 20 is positioned on a downward pressing path of the rod 222 on the rear end side of the lever 22, a balancing weight 224 is arranged on the rear end part 223 of the lever 22, and the weight of the balancing weight 224 is limited by the fact that when the lever 22 is not affected by external force, the rear end side of the lever 22 can descend and the pressure on the contact 201 of the lower limit switch can be kept; the lever limiting mechanism 3 is installed below the shaft between the lower limit switch 20 and the counterweight 224 on the platform 100, the lever limiting mechanism 3 includes a screw seat 31 and an adjusting screw 32, the adjusting screw 32 is fixedly installed on the upper surface of the screw seat 31 and located on the downward pressing path of the shaft 222 on the rear end side of the lever 22, and a surface height value a of the upper surface of the adjusting screw 32 is slightly higher than a surface height value B of the lowest position where the contact 201 of the lower limit switch sinks to trigger the lower limit switch 20.

When the limiting plate 1 touches the front end 221 of the lever after descending along with the car 10, the rod body 222 at the rear end of the lever tilts away from the contact 201, the lower limit switch 20 is in an off state, the controller sends out an instruction to the car lifting motor to be in a steering state which can only control the car to ascend, and the car 10 stops descending; when the car 10 ascends, the limit plate 1 gradually leaves the lever 22, the rear end side of the lever drops to be contacted with the contact 201 of the lower limit switch under the action of the gravity of the counterweight block 224 and keeps the rod 222 of the lever to press the contact 201 of the lower limit switch, the lower limit switch 20 is triggered due to the downward pressing of the contact 201, and the car lifting motor can rotate forwards or reversely under the instruction of the controller; when the limiting plate 1 descends to be in contact with the front end of the lever 22 again, the rod body 222 of the lever 22 leaves the contact 201, the contact 201 resets, the lower limiting switch 20 is in a disconnected state again, and the operation is repeated in this way, so that the control of the lower limiting switch in the elevator lifting process is realized.

The lower limit switch of the utility model is a conventional travel switch for hoisting equipment, such as a forming switch with model number LX22A-1 produced by shanghai qiao photoelectric device group limited company, a travel switch with model numbers LX22-1 and LX22-2 produced by an AoUnion electrical system, and the like, the working structures of a contact and the limit switch are the structures of the common general limit switch, and the controller is a conventional programmable logic control device integrated with a CPU in industrial production; are not described herein in detail; the lever limiting mechanism can be set as required, the pressure applied to the lower limiting switch by the lever can be controlled by additionally arranging the lever limiting mechanism, and the service life of the lower limiting switch is further prolonged.

The above only be the embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all utilize the equivalent flow transform that the content of the specification was made, or direct or indirect application is in other relevant technical field, all including on the same reason the utility model discloses a patent protection within range.

Claims (2)

1. The utility model provides a limit switch trigger device under modified construction elevator, its includes the limiting plate, the limiting plate is installed in the car outside, installs the lower limit switch who is connected with the controller communication under the car on the platform of the elevartor shaft of spacing department, lower limit switch has the contact of installing in lower limit switch side, its characterized in that: lower limit switch trigger device is still including installing the lever mechanism on limit switch place platform down, lever mechanism includes lever support and lever, the articulated installation in lever support in the middle part of lever, the front end of lever is located limiting plate descending path, and the pole body of the rear end side of lever is located down limit switch's contact top and down limit switch's contact is located the path of pushing down of the pole body of lever rear end side, installs a balancing weight on the lever rear end, the weight of balancing weight is with can realize the rear end side decline of lever and keep exerting pressure to lower limit switch's contact when the lever does not receive external force to be limited.

2. The construction elevator lower limit switch triggering device according to claim 1, characterized in that: the lever stop gear is installed to pole body below between limit switch and the balancing weight down on the platform, lever stop gear includes screw base and adjusting screw, adjusting screw fixed mounting is on the upper surface of screw base and lie in the lower pressure route of the pole body of lever rear end side, and the surface height value of adjusting screw's upper surface is a little higher than the surface height value of the extreme low position that the contact of limit switch was located after the trigger lower limit switch sinks.

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