CN115734937A

CN115734937A - Clamping device of guide rail for elevator

Info

Publication number: CN115734937A
Application number: CN202180045750.9A
Authority: CN
Inventors: 金荣基
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-23
Filing date: 2021-07-06
Publication date: 2023-03-03
Also published as: WO2022019531A1; KR102214527B1

Abstract

The present invention relates to a guide rail clamping device for an elevator, and more particularly, to a guide rail clamping device for an elevator, in which a clamp for pressurizing and fixing a guide rail by a cylinder provided in a housing and a guide rail for guiding the ascending and descending of an elevator through an elevator and an elevator shaft is installed, so that the guide rail can be firmly fixed when a door is opened, and thus a car can be prevented from shaking when the elevator is moved up and down, and particularly, when heavy equipment such as a small forklift is driven into the car in a state where the car is stopped, the descending of the car due to the stretching of a rope installed in the car can be prevented, and the fear and anxiety of an operator can be further eliminated, and an accident that is difficult to be predicted can be prevented, and thus, the safety can be improved.

Description

Clamping device of guide rail for elevator

Technical Field

The present invention relates to a clamping device of a guide rail for an elevator, which is provided in an elevator car that ascends and descends along an elevator shaft and firmly clamps the guide rail according to an operation signal received from a control part of the elevator,

disclosed is a gripping device equipped with a casing integrated into an elevator car and a clamp equipped on the casing for pressure-fixing the guide rail.

According to the clamping device of the guide rail for the elevator, the guide rail can be firmly clamped when the elevator car reaches the target floor and the door is opened according to the signal of the control part, so that the elevator car is prevented from shaking or shaking when the elevator goes up and down. In particular, it is possible to prevent a problem that the elevator car is instantaneously dropped due to the traction rope connected to the elevator car being stretched when heavy equipment such as a small forklift is driven into the elevator car or a heavy object is loaded into the elevator car in a state where the elevator car is stopped, and it is also possible to prevent a problem that the elevator car is instantaneously raised due to the restoration of the stretched traction rope when heavy equipment is driven out of the elevator car or the heavy object is unloaded from the inside of the elevator car, contrary to this, thereby implementing a rail clamping device for an elevator which prevents a safety accident that may occur when heavy equipment is driven into or out of the elevator car and improves the safety of the elevator car.

Background

Generally speaking, the elevator installation is installed inside a building and the elevator car is moved along vertical guide rails provided in the elevator hoistway, optionally by means of a support assembly or a drive acting directly on the elevator car or on the counterweight. Elevator installations are used for transporting persons or goods inside single-or multi-storey buildings, comprising various safety devices for providing protection of the elevator car in the event of a failure of the drive or the support assembly.

As prior arts related to the safety device as described above, for example, there have been disclosed a new publication No. 20-1994-0002173 "brake device of elevator" (hereinafter referred to as "prior art 1"), a publication No. 10-1995-0031859 "safety device of elevator" (hereinafter referred to as "prior art 2"), a publication No. 10-1994-0003953 "safety device of elevator" (hereinafter referred to as "prior art 3"), and a registered patent No. 10-0879681 "emergency stop device of elevator" (hereinafter referred to as "prior art 4"), and the like.

In the above prior art 1, there is disclosed a technique in which when an elevator stops at a service floor (arrival floor), a door lock switch 13 installed in a door pocket of the elevator is driven as a mechanical device for opening and closing a door 7, and further, a brake 14 installed in a winding machine on an upper portion of the elevator is driven to operate by an electric signal of an electric contact inside the door lock switch 13, and when the door 7 of the elevator is closed, the door lock switch 13 is driven to mechanically operate, so that the electric signal is transmitted to a control section 15 by the disconnection of the electric contact inside the door lock switch 13, and further, the brake 14 installed in the winding machine is driven to operate by the control section 15, thereby preventing the elevator from moving in a state where the door 7 of the elevator is opened in the service floor.

In the prior art 2, there is disclosed a technique including a safety ring coupled to a wall of an elevator shaft at a certain interval, a damper triggering device operated by a governor signal by being installed at an upper side of an elevator car, a damper moved to one side of the safety ring by the damper triggering device when the elevator car is over-running, and a damper ring coupled to the safety ring by being installed at an upper end portion of the damper when the damper is moved to one side of the safety ring, thereby stopping the elevator car, so that the falling elevator car can be prevented from falling toward the elevator shaft when the elevator car is rapidly falling from a high rise, but can be safely stopped at a nearest safety ring installation portion among safety rings installed at the elevator shaft at a certain interval, and thereby preventing a safety accident from occurring in advance.

In the above prior art 3, there is disclosed an elevator safety device which can perform emergency braking by quickly detecting a failure of a brake device, thereby ensuring safety of passengers.

In the conventional art 4, there is disclosed a technology of an elevator safety device which does not require complicated control and can reduce deceleration at the time of braking operation by a simple configuration to thereby avoid discomfort to passengers or damage to a lifter or a counterweight, the elevator safety device including a lifter which ascends and descends along a guide rail and is provided with a car for passengers and a frame for supporting the car, a wedge which is attached to the lifter and moves upward along the guide rail relative to the lifter in an emergency, and a pressure body which pressurizes the wedge against the guide rail by an elastic member, and further including a pressurizing force adjusting unit which reduces a pressurizing force of the wedge when a loading mass of the lifter which changes according to entrance and exit of a passenger becomes large and increases a pressurizing force of the wedge when the loading mass of the lifter becomes small.

As shown in the above-mentioned prior art, the braking device of the elevator is directly related to the safety problem of the user, and thus a technology for improving the safety thereof by various means has been proposed, but there is still a need to develop a technology for not only further reducing the risk of accidents and ensuring safe entrance and exit, but also simplifying the structure and improving the durability in consideration of the load to be borne by the elevator.

In particular, in the case of loading or unloading a heavy object to or from an elevator car in contrast, when a difference of 20mm or more occurs in the position of the elevator car with respect to the ground of a stopping floor due to the extension or restoration of a traction rope, it is required by law to maintain a level with the bottom surface of the stopping floor by driving a large-sized winding motor equipped in a machine room of an upper portion of the elevator at a very low speed. The frequent operation of the large-sized winding motor as described above not only causes a problem of low efficiency but also may cause a problem of malfunction of the winding motor, and further may become a major factor of deterioration of the stability of the elevator.

Disclosure of Invention

Object of the Invention

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide an elevator guide rail clamping device, comprising: a housing equipped with a receiving portion through which a guide rail installed in an elevator shaft passes and coupled to an elevator car; a cylinder provided to the housing; the clamp fixes the guide rail when the door is opened through the air cylinder; thereby stably fixing the elevator car when a user enters or exits and thereby ensuring the safety thereof, and particularly, when heavy equipment such as a forklift enters the elevator car, the elevator car can be firmly fixed to prevent the elevator car from instantaneously falling or rising.

In particular, another object of the present invention is to provide a clamping device for an elevator guide rail, which can stably increase a pressurizing force for pressurizing the guide rail by forming a rounded portion at a plunger tip of a cylinder for pushing a clamp to advance, thereby increasing a contact force.

Further, another object of the present invention is to provide a clamping device for an elevator guide rail, in which an elastic member is further introduced between the clamp and the plunger, so that even when one side of the plunger pressurizing the guide rail is first brought into close contact with the other side of the plunger, the pressurizing force can be prevented from being first transmitted by the elastic force, and the pressurizing force can be transmitted to the guide rail while the clamps on both sides of the guide rail are secured.

Technical scheme

In order to achieve the above object, an elevator guide rail clamp apparatus according to the present invention includes:

a housing coupled to an elevator car and formed with a rail-shaped receiving portion for mounting on an elevator shaft;

a cylinder provided on the housing and provided with a plunger that advances and retreats in the direction of the guide rail; and (c) a second step of,

and a clamp provided in front of the cylinder, having an insertion space into which a front end of the plunger is inserted, and pressurizing the guide rail by forward movement of the plunger.

Advantageous effects

According to the clamping device of the guide rail for the elevator, which is provided by the invention, the clamping device can be combined with the elevator car, is provided with the housing of the accommodating part for the guide rail to pass through, and the clamp which is arranged on the housing and pressurizes and fixes the guide rail arranged on the elevator shaft through the air cylinder, so that the elevator car is prevented from shaking when heavy equipment such as a forklift enters the elevator, particularly the phenomenon that the elevator car instantly drops and moves due to the extension of the rope for supporting the elevator car is prevented, and the occurrence of accidents is prevented in advance while the stable feeling of the elevator car is improved.

Further, the guide rail can be pressurized and fixed by a strong pressure by using the hydraulic cylinder, so that when a heavy object such as a forklift is loaded into the elevator car in a stopped state, the elevator car is prevented from descending due to the fact that a rope mounted on the elevator car is stretched, the sense of fear and anxiety of an operator is further eliminated, accidents which are difficult to predict can be prevented, and safety can be improved accordingly.

Further, the plunger of the cylinder and the clamp which advances by being brought into close contact with the front end of the plunger to press and fix the guide rail can transmit the pressing force in the advancing direction more stably by forming a circular portion at the front end of the plunger and a curved portion which comes into close contact with the circular portion at the rear end of the clamp.

Further, by further introducing an elastic member between the clamp and the plunger, even when one side of the plunger that pressurizes the guide rail is first brought into close contact, the pressurizing force can be prevented from being first transmitted by the elastic force, and the clamp on both sides of the guide rail can transmit the pressurizing force to the guide rail at the same time, thereby preventing the guide rail from being bent or broken by the pressurizing force transmitted from one direction.

Drawings

Fig. 1 is a half-projected horizontal sectional view of a clamping device according to the present invention.

Fig. 2 is a semi-projected side view of a clamping device according to the invention.

Fig. 3 is an enlarged semi-projected view of the cylinder and clamp illustrated in fig. 2.

Fig. 4 is a hydraulic circuit diagram of a clamping device according to the present invention.

Detailed Description

Next, the present invention will be described in detail with reference to the accompanying drawings. The present invention can be implemented in various forms with various modifications, and the following text will describe an embodiment (or an embodiment) in detail. However, the present invention is not limited to the specific embodiments disclosed, but should be understood to include all modifications, equivalents, and alternatives included within the spirit and scope of the present invention.

In the various figures, the same reference numerals, in particular the tens and the units or the tens, the units and the letters, denote the same or similar components, and unless otherwise explicitly mentioned, the components referred to by the respective reference numerals in the figures are understood to be the components conforming to the basis.

In addition, the size or thickness of the components in the drawings may be exaggerated (or increased) or reduced (or decreased) or simplified for easy understanding, but it should not be construed that the scope of the present invention is limited thereby.

The terms used in this specification are used only for describing a particular embodiment (or example) and are not intended to limit the invention, unless the context clearly indicates otherwise, and singular statements also include plural references. In the present application, terms such as "comprise" or "comprise" 8230, "are used only to indicate the presence of the features, numbers, steps, actions, components, parts or combinations thereof described in the specification, and should not be understood as excluding the possibility of the presence or addition of one or more other features, numbers, steps, actions, components, parts or combinations thereof in advance.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms commonly used as they are defined in dictionaries should be interpreted as having a meaning that is consistent with the context of the relevant art and should not be interpreted in an idealized or exaggerated sense unless expressly so defined in this application.

According to the clamping device D of the guide rail for the elevator, the clamping device D is arranged on the elevator, so that the shaking of the elevator during the entering and exiting is prevented, and the guide rail GR can be stably and firmly clamped even when heavy equipment such as a forklift enters the elevator car in a state that the elevator car is stopped, and the clamping device D comprises a shell 10 arranged on the elevator car, a cylinder 20 arranged on the shell 10 and a clamp.

In this specification, a case where heavy equipment such as a forklift enters is described as an example, but the case where "heavy objects" that are extremely heavy loads are loaded inside the elevator car is also included, and the scope of the claims should not be construed as being limited thereto.

First, an elevator is configured by a cable or rope and an elevator car that ascends and descends in an elevator shaft via a counterweight, and in order to guide the ascending and descending of the elevator car, a guide rail GR is generally provided in a vertical direction on the elevator shaft, and a guide shoe for accommodating the guide rail GR is generally provided in an upward direction of the elevator leg.

Further, as is well known, the guide rail GR is composed of a fixing portion GR1 fixed to a wall surface of the elevator shaft and a guide rail portion GR2 protruding from the fixing portion GR1 to be guided by guide shoes provided on the elevator car.

Next, the housing 10 will be described in detail with reference to fig. 1 and 2. The housing 10 may be provided on one or both sides of the elevator car or on three wall surfaces other than the doors.

The housing 10 includes a frame 131, a rail space 133 formed in a central portion of the housing and accommodating the rail portion GR2, cylinder supports 13 disposed symmetrically about the rail space 133 on the housing frame 131, a cylinder 20 supported by the cylinder supports 13, and a clamp 30, thereby constituting one clamping unit 12. A hydraulic unit 11 is integrally coupled to an upper portion of the gripping unit 12, and the hydraulic unit 11 is provided with a separate driving device that drives a cylinder of the gripping unit 12 in conjunction with an opening/closing operation of a door of an elevator car.

As shown in fig. 1 and 2, the hydraulic unit 11 includes a pump P for supplying fluid to the cylinder 20 and a driving motor M, and further includes a check valve M1, a pressure gauge M2, an ON/OFF valve M3, a pressure switch M4, an Accumulator M5, and a Relief valve M6, and the cylinder 20 is formed of a hydraulic cylinder 20 to transmit hydraulic pressure to the clamp 30.

The check valve M1 is used to protect the operation of the cylinder 20, and the accumulator M5 is a device for storing hydraulic pressure, so that the pressure of the fluid supplied to the cylinder 20 can be maintained even in the case of a small amount of oil leakage in the hydraulic circuit.

FIG. 4 is a hydraulic circuit diagram of a hydraulic unit driving apparatus (a pump P, a driving motor M, a check valve M1, a pressure gauge M2, an ON/OFF valve M3, a pressure switch M4, an Accumulator M5, and a pressure reducing valve M6) according to the present invention,

first, upon receiving a stop signal of the elevator car, the driving motor M is turned ON and the plunger of the cylinder 20 advances to clamp the guide rail GR, and upon reaching a set pressure, the operation of the pump P is stopped by the pressure switch M and the supply of fluid to the cylinder 20 is stopped. The fluid that has flowed into the hydraulic circuit does not flow backward under the action of the check valve, thereby maintaining the set pressure. In this case, the present invention may clamp the guide rail GR for a long time by providing the accumulator M5 and by using the working oil accumulated in the accumulator M5.

Next, the releasing operation of the clamping device will be described. When the ON/OFF valve is switched to the ON state in response to a door close signal of the elevator car, the hydraulic oil compressed in the hydraulic circuit is released into the oil tank, and thus the clamp that pressurizes the guide rail GR is returned to the clamping waiting position, i.e., the home position, by the force of a return spring described later.

The guide rail GR can be clamped or released according to the opening or closing signal of the door through the structure, so that the elevator car is prevented from shaking when entering or exiting, the safety of the elevator car is ensured, and particularly, the guide rail can be firmly clamped by using the clamping unit of the invention under the condition that the weight is changed due to the fact that heavy equipment such as a forklift enters the elevator car or loads heavy objects in a stop state, so that the elevator car is prevented from shaking.

Next, the cylinder 20 and the clamp for pressurizing and fixing the guide rail GR, which are main features of the present invention, will be described in more detail with reference to fig. 1 to 3.

First, as shown in fig. 1 to 3, the clamp and the cylinder are simultaneously disposed on both sides of the guide rail GR and are divided into two or three sections in the vertical direction (the upper and lower sections are illustrated in the drawings, but the scope of the present invention is not limited thereto), so that the guide rail GR can be stably pressurized and fixed, and more specifically, two cylinders 20 disposed in the vertical direction pressurize the two clamps 30 mounted on both sides of the guide rail GR so as to face each other, thereby improving the pressurizing force and securing the stability during pressurization.

For reference, in order to facilitate the description of the operation of the gripping unit 12, the direction in which the plunger 23 moves toward the receiving portion 133 that receives the guide rail GR is referred to as a forward direction and the opposite direction is referred to as a backward direction with reference to the direction in which the plunger 23 moves toward the receiving portion.

In addition, guide shoes are generally provided in guide rail spaces of an elevator car through which guide rails GR can pass, which is a generally known structure, and a roller R that idles at a slight interval from the guide rails GR is provided in addition to the known guide shoes in a housing of the clamp device according to the present invention. The rollers R provided in the clamping device of the present invention include four attacking rollers respectively abutting on the upper and lower portions of both side surfaces of the guide rail portion GR2 of the guide rail GR and five rollers in total, which are rollers provided on the opposite side of the fixed portion GR1 of the guide rail GR, so that it is possible to further secure a long-term and quiet operation of the elevator together with the known guide shoe provided in the elevator car. Further, a plurality of support rods 132 are provided on the cylinder support portion 13, so that not only the cylinder 20 and the clamp 30 can be more stably mounted, but also the durability thereof can be improved by the reinforcing rib function.

First, the cylinder 20 is provided to the cylinder support portion 13 of the housing 10, and the cylinder 20 includes a housing 21 formed with a working portion 212 and a plunger 23 advanced by hydraulic pressure within the working portion 212.

The cylinder 20 can forcibly advance the plunger 23 by means of the hydraulic pressure supplied from the pump P, and the housing 21 is firmly fixed to the cylinder support portion 13. A connection portion 131a connected to the fluid transfer path PR for allowing the fluid supplied from the pump P to flow into the cylinder 20 is formed at one side of the housing 10, that is, the cylinder support portion 13 constituting the housing 10. Further, an inflow hole 211 communicating with the connection portion 131a and supplying an inflow fluid to a working portion 212 having the plunger 23 built therein is formed in the housing 21.

At a position corresponding to the connection portion 131a on the hydraulic unit 11 coupled to the clamp unit 12, a corresponding connection portion is formed.

When the fluid is supplied to the working part 212, the fluid advances the plunger 23 by pushing the rear end of the plunger 23 provided on the working part 212, at which time a notch groove 235 is formed at the rear end of the plunger 23, thereby ensuring that the pressurizing force is transmitted to the rear end of the plunger 23 with uniform force.

In order to increase the contact force with the inner wall surface of the housing 21 and prevent the fluid from leaking, one or more sealing members may be further provided on the outer surface of the plunger 23.

The plunger 23 of the cylinder 20 advances with the supply of fluid and pushes the clamp forward by the forward force, so that the clamp 30 is not pressed against the guide rail portion GR2 of the guide rail GR.

As shown in the drawing, the clamp 30 has an insertion space 31 formed at the rear end thereof into which the front end of the plunger 23 is inserted, and has a flat-type contact portion formed at the front end thereof for contacting the guide rail portion GR2 of the guide rail GR.

Further, as described above, since the one of the grippers is pressurized in the vertical direction by the two air cylinders 20, two vertically spaced insertion space portions 31 are provided at the rear ends of the grippers.

Next, the shapes of the plunger 23 and the interpolation space part 31 will be described in more detail. The front end of the plunger 23 is not cylindrical, but a circular portion 231 is formed on the outer surface so that the diameter thereof gradually decreases toward the front end, and a curved portion 33 corresponding to the shape of the circular portion 231 is formed on the wall surface of the insertion space portion 31.

Therefore, the pressing force of the plunger 23 is transmitted in the correct direction along the central axis of the insertion space of the clip 30 by the interaction between the circular portion 231 of the plunger 23 and the corresponding curved portion 33 of the clip 30, and the pressing force is more stably transmitted to all directions to disperse the force, thereby more firmly and safely fixing the guide rail GR.

If the rear end of the clip is flat and the front end (front) of the plunger 23 is flat, the operation of gradually and slowly pressurizing the clip when the plunger 23 advances is the same as the operation of the plunger 23 provided with the circular portion 231 and the plunger 30 provided with the curved portion 22 corresponding thereto of the present invention, but unlike the present invention, the pressurizing force is transmitted only to the portion in contact with the plunger 23 in the linear direction, so that the force is not uniformly transmitted to the surface of the guide rail GR, and a slight error may occur in the position of the clip 30 or the plunger 23 when the plunger 23 advances.

In addition, when the plunger 23 is formed in a cylindrical shape and the insertion space 31 is also formed in a cylindrical shape corresponding thereto, although the plunger 23 can accurately pressurize the position of the rear end of the clip 30, as described above, the force is linearly transmitted only along the central axis of the insertion space 31, which causes a problem that the pressurizing force is excessively concentrated.

In contrast, according to the present invention, the circular portion 231 is formed at the front end of the plunger 23 and the curved portion 31 is formed at the insertion space portion 31, so that the force transmitted from the plunger 23 is transmitted through the curved portion 33, and thus the force is uniformly transmitted to the clamp 30 and is dispersed and transmitted to one side surface of the guide rail GR, thereby further increasing the pressurizing force.

Meanwhile, by further providing an elastic body interior part 232 on the plunger 23 and an elastic member 37 on the elastic body interior part 232, an elastic force can be further applied between the plunger 23 and the clip, at which time the elastic member 37 can receive a supporting force, and a flat type flat supporting part 35 is formed in front of the curved part 33 of the insertion space part 31 and a rear end supporting part 234 is formed in the elastic body interior part 232, so that both ends of the elastic member 37 can be closely attached to the flat supporting part 35 and the rear end supporting part 234 and receive a supporting force.

Therefore, a total of four rollers provided on both sides of the guide rail GR receive the pressing force at the same time by the elastic force of the elastic member 37, so that the clamp 30 presses and fixes both sides of the guide rail GR at the same time.

Specifically, even when one side of the clamp 30 comes into contact with the guide rail GR first, the pressurizing force is not transmitted by the elastic force of the elastic member, but when the fluid is supplied to the cylinder 20 and the fluid continues to advance, the pressurizing force is transmitted after the elastic member 37 is completely compressed, so that the clamp 30 can pressurize both sides of the guide rail GR at the same time.

Further, by giving a double elastic force by a return spring described later, the force of the cylinder 20 can be transmitted more perfectly at the same time.

Furthermore, the present invention is also equipped with a reset unit 40 for resetting the plunger 23 of the cylinder 20 to an original position in a case where the hydraulic pressure supplied into the cylinder 20 is released.

The reset unit 40 includes a reset member 43 which is protrudingly provided at one side of the housing 10 and fixed to the clamp by penetrating the housing 10, and a reset induction spring 41 which is externally inserted to the outside of the reset member 43 at one side of the housing 10 and supports a gap between an outer side surface of the housing 10 and an end of the reset member 43.

That is, when the hydraulic oil compressed in the hydraulic circuit is released, the restoring member 43 and the connected caliper are retracted by the restoring force of the compressed restoring-inducing spring 41, and when the caliper is retracted, the plunger 23 of the cylinder 20 is restored to the original position.

At this time, the elastic member 37 may also play another role, specifically, in order to retreat the plunger 23, it is necessary to discharge the fluid introduced into the inside of the housing 21, and a difference necessarily occurs between the return speed of the return inducing spring 41 and the discharge speed of the fluid, so that the speed can be matched and stably returned by the compression of the elastic member 37.

In the course of describing the present invention in the above, the holder having a specific shape and structure and constitution is mainly described with reference to the accompanying drawings, but the present invention may be variously modified, changed and replaced by the relevant practitioner, and the modifications, changes and replacements as described above should be construed to be included in the scope of the claims of the present invention.

Industrial applicability

Further, as shown in fig. 1 and 2, the housing 10 includes a clamping unit 12 equipped with the clamp 30 and the cylinder 20, and the hydraulic unit 11 equipped with a pump and an accumulator, etc. may be coupled to an upper portion of the clamping unit 12. The clamp device of the present invention configured as described above can improve convenience of maintenance by coupling the hydraulic unit 11 and the clamp unit 12 with the fixing bolt MB, and can improve space efficiency by a two-stage structure so as to be installed in a minimum area.

Further, by using a battery as a power source for driving the pump of the hydraulic unit 11, the elevator can be used as an emergency brake device for emergency stop of the ascending and descending operation of the elevator at the time of power failure.

Furthermore, by providing the oil ring OR around the inflow hole 211 of the cylinder 20 provided in the clamping unit 12, leakage of fluid can be perfectly prevented, and by providing the oil ring OR at a connection portion of a fluid moving path between the clamping unit 12 and the hydraulic unit 11 when the clamping unit 12 and the hydraulic unit 11 are coupled, even in the case of a simple coupling structure in which the clamping unit 12 and the hydraulic unit 11 are coupled by bolts, leakage of fluid at the connection portion can be prevented by means of the oil ring and reliability of the apparatus can be improved, thereby having great industrial applicability.

Claims

1. A clamping device of a guide rail for an elevator, comprising:

a housing (10) which is provided in an elevator car and in which a guide rail-shaped accommodation portion is formed so as to be attachable to an elevator shaft;

a cylinder (20) provided on the housing and provided with a plunger that advances and retreats in the direction of the guide rail; and the number of the first and second groups,

a clamp (30) which is arranged in front of the cylinder, is provided with an inner insertion space part into which the front end of the plunger can be introduced, pressurizes the guide rail by the advancing action of the plunger,

a curved circular portion having a gradually decreasing diameter is formed at a plunger front end of the cylinder (20),

a curved portion corresponding to the circular portion of the plunger tip is formed in the insertion space portion of the clip (30) so as to be in close contact with the plunger tip.

2. The clamping device of guide rail for elevator according to claim 1, characterized in that:

a flat support part is formed in front of the curved part of the insertion space part, an elastic body inner part with a rear end support part is arranged on the plunger,

and an elastic member (37) which is introduced into the elastic body interior part and has both end parts in close contact with the flat support part and the rear end support part.

3. The clamping device of guide rail for elevator according to claim 1, characterized in that:

the cylinders (20) are respectively provided with one or more than two cylinders at two sides of the guide rail.

4. The clamping device of a guide rail for an elevator according to any one of claims 1 to 3, wherein:

the housing (10) further comprises a reset unit (40) which is composed of a reset component (43) interlocked with the clamp (30) and a reset inducing spring (41) which is externally inserted to the reset component and supports the outer side of the housing;

when the pressure of the cylinder (20) is released, the clamp (30) is retracted by means of the return unit (40) and the guide rail and the clamp are thereby not pressed against each other.