CN217732371U

CN217732371U - Sprocket traction type villa elevator

Info

Publication number: CN217732371U
Application number: CN202220087250.3U
Authority: CN
Inventors: 涂崇韬
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-01-14
Filing date: 2022-01-14
Publication date: 2022-11-04
Anticipated expiration: 2032-01-14

Abstract

The chain wheel traction type villa elevator comprises a derrick 2 vertically penetrating at least two floors in a building 1 and a car 3 vertically sliding in the derrick 2, wherein the top of the derrick 2 is connected to the ceiling of a top floor, and the bottom of the derrick 2 is connected to the floor of a bottom floor; the top of the derrick 2 is fixedly provided with an upper frame 4, the upper frame 4 is internally provided with an electric control box 51, a servo motor 52 driven by the electric control box 51 and a worm gear reducer 53 driven by the servo motor 52, and the edge of the upper frame 4 is provided with a plurality of power chain wheels 54 in running fit; the bottom of the derrick 2 is provided with a plurality of rotationally matched bottom idle wheels 55 at the edge, and the bottom idle wheels 55 and the power chain wheels 54 are arranged in pairs in a one-to-one correspondence manner in the vertical direction; a plurality of power chains 56 which are matched with the power chain wheels 54 and the bottom idle wheels 55 arranged in pairs in a chain wheel transmission way are arranged on the cage 3; the electric control box 51 drives the car 3 to ascend and descend along the derrick 2 to each floor penetrated by the derrick 2 through a servo motor 52, a worm gear reducer 53, a power chain wheel 54, a bottom idle wheel 55 and a power chain 56 in a matching way.

Description

Sprocket traction type villa elevator

Technical Field

The utility model relates to an elevator technical field, specificly are sprocket traction type villa elevator.

Background

The utility model mainly aims at solving the scheme that the elevator is built in the villa type low-rise building with the room and the kitchen at the bottom and the room at the two floors. Through a large amount of researches and inquiry and understanding from multiple directions, the applicant finds that elevator products which are suitable for low-rise building transformation and installation in the current market have problems in aspects of safe use, maintenance, normal operation timeliness, service guarantee and the like except a few expensive imported brands, and the performance price is difficult to obtain.

The applicant has sought to find that in the prior art the types of elevator are divided into traction type and push type according to the way the car is driven.

The traction type elevator is an elevator type commonly adopted by all high-rise buildings at present, a steel rope hoisting structure is adopted as a lifting mechanism, and specifically, an electric hoisting device (also called an elevator tractor) is arranged in a machine room at the top end of an elevator shaft and used as a steel rope hoisting structure to drive a steel rope so as to hoist a car.

The push type elevator is an elevator type of a low-rise building elevator such as a villa, and is characterized in that a car is driven to ascend and descend along a vertical column in a single-point mode, and the car is driven by a screw rod pushing mechanism and a hydraulic pushing mechanism in a common mode. The screw rod pushing mechanism drives the nut to rotate through the motor, and pushes the lift car to lift along the guide rod in a screw rod transmission mode; the hydraulic pushing mechanism provides power through the electric hydraulic station and drives the hydraulic cylinder to push the lift car to move up and down along the vertical upright post. For a push type elevator, as a driving point and an upright post are positioned at the edge of a load platform, the gravity center of a load deviates from the driving point, and the load is in an unbalanced load stress state, and a large bending moment is applied to a platform bracket and the local part of the upright post, which is an important factor influencing safe and stable operation and mechanical operation efficiency. Therefore, the component material of the push type elevator must have enough bending strength under the load bearing condition, in order to ensure safe and smooth operation and improve the mechanical operation efficiency, the dynamic friction coefficient of the main parts in the full stroke of operation is reduced as much as possible, and high requirements on the aspects of material and part selection, manufacturing process, machining precision and the like are required.

In general, compared with the aspects of structural principle, stress state, safety performance and actual operation characteristic, the traction type elevator is superior to the push type elevator. However, the traction type elevator is mainly influenced by factors such as large space occupation, difficult whole project and high construction cost, and is always limited to be implemented in high-rise buildings. When an elevator is modified and installed in a low-rise building, a traction type elevator is usually abandoned and a push type elevator is adopted.

Obviously, when an elevator is additionally installed in a low-rise building such as a villa, a traction type elevator with better performance is sought according to the prior art, the price is inevitably relatively expensive, the implementation is inconvenient, and the improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at remedying the defects of the prior art and providing a chain wheel traction type villa elevator, the technical scheme is as follows.

Sprocket traction formula villa elevator, including a vertical derrick that link up two at least floors in the building, vertical slip travel in the inside car of derrick, in the floor that the derrick link up, the top of derrick is connected on the ceiling of top floor, and the bottom is then connected on the floor of bottom floor.

The top of the derrick is fixedly provided with an upper frame, an electric control box, a servo motor driven by the electric control box and a worm gear reducer driven by the servo motor are arranged in the upper frame, the edge of the upper frame is provided with a plurality of power chain wheels which are in running fit, and the servo motor is driven to be in synchronous transmission connection with the power chain wheels through the worm gear reducer; the bottom of the derrick is provided with a plurality of bottom idle wheels which are in running fit at the edge, and the bottom idle wheels and the power chain wheels are arranged in pairs in a one-to-one correspondence manner in the vertical direction.

The lift car is of an open structure with no enclosure on four walls, and a plurality of power chain wheels and bottom idle wheels which are arranged in pairs form a power chain in transmission fit with the power chain wheels; one end of the power chain is vertically and upwardly pulled to the rear edge of the matched power chain wheel, then sequentially winds the upper edge and the front edge of the power chain wheel, and vertically and downwardly detours to form a load end fixedly connected to the upper part of the lift car; the other end of the power chain is vertically pulled downwards to the rear edge of the bottom idle wheel, then sequentially winds the lower edge and the front edge of the bottom idle wheel, and vertically bypasses upwards to form a hanging end; the lower part of the lift car is provided with a tensioning mechanism which elastically contracts in the vertical direction, and the lift car draws the hanging end of the power chain upwards through the tensioning mechanism so as to enable the power chain to be elastically tensioned on the power chain wheel and the bottom idle wheel; the electric control box drives the lift car to ascend and descend along the derrick to each floor penetrated by the derrick through the matching of a servo motor, a worm gear and worm reducer, a power chain wheel, a bottom idle wheel and a power chain.

Corresponding to the floors penetrated by the derrick, calling buttons corresponding to all the floors are arranged outside the derrick, carriage doors corresponding to all the floors are arranged on the front wall of the derrick, and uplink/downlink operating buttons distributed on all the floors are arranged on the inner wall of the derrick; an electric signal for requesting the car to stop at the floor corresponding to the calling button is input into the electric control box through the calling button, and an electric signal for requesting the elevator to go up/down to other floors is input into the electric control box through the up/down operation button.

Chain wheel among the above-mentioned technical scheme tows formula villa elevator and has carried out redesign to towing the type elevator, adopts power sprocket, bottom idler and power chain cooperation to constitute chain wheel formula transmission mechanism, makes the load gravity of car divide and exerts many power chain, has improved the steady operation performance of car. The elevator car is dragged to ascend and descend by the matching of the servo motor, the worm gear and worm reducer, the power chain wheel, the bottom idle wheel and the power chain, the structure is simple and reliable, the synchronization performance is very close to that of gear transmission, and the self-locking characteristic of the worm gear and worm reducer is utilized to provide more effective guarantee for the safe operation of the elevator. In addition, the power chain wheel, the bottom idle wheel and the power chain are in a vertically arranged structure, and the 'object dragging line' effect caused by the gravity of the power chain is ideally inhibited.

In the technical scheme, a steel rope winding assembly and a steel rope balance hanging device with a pulley at the top of the cage are not arranged, so that the required space is greatly reduced; and the lift car is designed according to a passive and enclosure-free structure, no mobile cable is externally connected, the floor area of the lift car is close to the floor area of the derrick, and the whole mechanism is simple in design and is more suitable for assembling two-storey or three-storey low-rise buildings.

Compared with the prior art, the beneficial effects of the utility model reside in that: compared with a traction type elevator and a push type elevator in the prior art, the whole mechanism is simple in design, the required space is greatly reduced, the construction cost is low, and the mechanism is suitable for assembling of a two-storey or three-storey low-rise building.

The invention is further described with reference to the drawings and the detailed description.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of a derrick according to the present invention.

Fig. 3 is a schematic horizontal cross-section of a derrick according to the present invention.

Fig. 4 is a partially enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic structural view of the upper frame of the present invention.

Fig. 6 is a schematic structural view of the car of the present invention.

Fig. 7 is a partially enlarged view of fig. 6 at B.

Fig. 8 is a partial enlarged view of fig. 6 at C.

Detailed Description

The embodiment of the present invention is shown in fig. 1 to 8.

Sprocket traction formula villa elevator, including one in building 1 vertical well frame 2, the vertical inside car 3 of traveling in well frame 2 that link up two at least floors, in the floor that well frame 2 link up, the top of well frame 2 is connected on the ceiling of top floor, and the bottom is then connected on the floor of bottom floor.

The top of the derrick 2 is fixedly provided with an upper frame 4, the upper frame 4 is internally provided with an electric control box 51, a servo motor 52 driven by the electric control box 51 and a worm gear reducer 53 driven by the servo motor 52, the edge of the upper frame 4 is provided with a plurality of power chain wheels 54 in running fit, and the servo motor 52 is driven to be synchronously connected with the power chain wheels 54 through the worm gear reducer 53; the bottom of the derrick 2 is provided at the edge with a plurality of bottom idlers 55 which are rotatably engaged, and the bottom idlers 55 are provided in pairs corresponding to the power sprockets 54 in the vertical direction one by one.

The cage 3 is arranged to be an open structure without surrounding barriers on four walls, a plurality of power chain wheels 54 arranged in pairs and a plurality of power chains 56 which are matched with each other in a chain wheel transmission mode and formed by bottom idle wheels 55 are arranged on the cage 3; one end of the power chain 56 is vertically pulled upwards to the rear edge of the matched power chain wheel 54, then sequentially winds around the upper edge and the front edge of the power chain wheel 54, and vertically detours downwards to form a load end 561 fixedly connected to the upper part of the car 3; the other end of the power chain 56 is vertically drawn downwards to the rear edge of the bottom idle wheel 55, then sequentially passes through the lower edge and the front edge of the bottom idle wheel 55, and vertically bypasses upwards to form a hanging end 562; the lower part of the car 3 is provided with a tensioning mechanism 30 which elastically contracts in the vertical direction, and the car 3 draws the hanging end 562 of the power chain 56 upwards through the tensioning mechanism 30 so as to enable the power chain 56 to be elastically tensioned on the power chain wheel 54 and the bottom idle wheel 55; the electric control box 51 drives the car 3 to ascend and descend along the derrick 2 to each floor penetrated by the derrick 2 through a servo motor 52, a worm gear reducer 53, a power chain wheel 54, a bottom idle wheel 55 and a power chain 56 in a matching way.

Corresponding to the floor through which the derrick 2 passes, a calling button 61 corresponding to each floor is arranged outside the derrick 2, the front wall of the derrick 2 is provided with a compartment door 20 corresponding to each floor, and the inner wall of the derrick 2 is provided with an uplink/downlink operating button 62 distributed on each floor; an electric signal requesting the car 3 to stop at the floor corresponding to the call button 61 is input to the electric control box 51 through the call button 61, and an electric signal requesting the elevator to go up/down to another floor is input to the electric control box 51 through the up/down operation button 62.

Referring to the above embodiment, the utility model discloses a sprocket traction type villa elevator has carried out redesign to dragging type elevator, adopts power sprocket 54, bottom idler 55 and the cooperation of power chain 56 to constitute chain wheel formula transmission mechanism, makes car 3's load gravity divide and apply in many power chain 56, has improved car 3 smooth operation performance. The servo motor 52, the worm gear reducer 53, the power chain wheel 54, the bottom idle wheel 55 and the power chain 56 are matched with the traction car 3 to lift, the synchronization performance is very close to gear transmission, and the self-locking characteristic of the worm gear reducer 53 is utilized to provide more effective guarantee for the safe operation of the elevator. Moreover, the power sprocket 54, the bottom idler 55 and the power chain 56 are vertically arranged, and the "drag line" effect caused by the gravity of the power chain 56 is ideally suppressed.

Referring to the above embodiment, the sprocket traction type villa elevator of the utility model has no steel cable winding component and no steel cable balance hanging device with pulleys on the top of the cage, and the required space is greatly reduced; and, the car 3 is according to passive, do not have the structural design of enclosing the shelves, does not have the external antithetical couplet of removal cable conductor, and 3 floor areas of car are close with derrick 2 area, and the design of whole mechanism is succinct, more is applicable to two layers or three layers of low-rise building 1 and assembles.

In the preferred embodiment, the top of the car 3 has a square top frame 31, the bottom of the car 3 has a square bottom frame 32, and a plurality of vertical rods 33 are provided for fixedly connecting the top frame 31 and the bottom frame 32 in the vertical direction to form a three-dimensional frame structure; the vertical rods 33 are in one-to-one correspondence with the power chains 56 in the vertical direction, the load ends 561 of the power chains 56 are fixedly connected to the upper sections of the corresponding vertical rods 33, and the tensioning mechanisms 30 are fixedly connected to the lower sections of the vertical rods 33.

Further, in the above preferred embodiment, the four corners of the top frame 31 and the bottom frame 32 of the car 3 are aligned in the vertical direction to form the vertical edges of the car 3, and the four corners of the top frame 31 and the bottom frame 32 of the car 3 are respectively provided with a guide wheel set 34 erected outwards, and the guide wheel set 34 is provided with two rollers 341 vertically intersected in the axial direction on the horizontal plane; the derrick 2 is provided with four upright posts 21 respectively corresponding to the vertical edges of the cage 3, and the upright posts 21 are provided with two cylindrical surfaces 211 which protrude inwards to form a right-angle fit; on the vertical edge of the car 3 corresponding to the upright post 21, the rollers 341 in the guide wheel set 34 are respectively matched with the cylindrical surface 211 of the upright post 21 in a rolling way, so that the car 3 can be restrained inwards by the upright post 21 of the derrick 2 to eliminate swinging, and the car is guided to run stably.

Further, in the above preferred embodiment, the vertical rod 33 has three vertical rods, which are respectively arranged on the vertical edges of the two sides of the front surface of the car 3 and the vertical middle line of the back surface of the car 3. Or, the vertical rods 33 have four, which are respectively arranged on the vertical edges on both sides of the front surface of the car 3 and on the vertical edges on both sides of the back surface of the car 3. So, can realize having the multiple spot of three points or four points to car 3 and hang, the car 3 load focus is in the stable area of hanging, and vertical gravity is difficult more to produce the horizontal component that leads to the wobbling, has further improved the steady operation performance of car.

Further, in the above preferred embodiment, the tensioning mechanism 30 has a guide sleeve 301 fixed on the upright 33, a pull rod 302 vertically penetrating the guide sleeve 301 to form a sliding fit, an adjusting nut 303 is screwed on the upper end of the pull rod 302, a cylindrical spring 304 sleeved on the pull rod 302 is arranged below the adjusting nut 303, the cylindrical spring 304 is elastically compressed between the adjusting nut 303 and the guide sleeve 301, and the hanging end 562 of the power chain 56 is connected to the lower end of the pull rod 302. The height of the adjusting nut 303 on the pull rod 302 is adjusted, namely, the expansion degree of the power chain 56 is adjusted by matching with a cylindrical spring 304.

In the preferred embodiment, in one group of the power sprocket 54, the bottom idle wheel 55 and the power chain 56 which form the sprocket transmission fit, two collision blocks 560 respectively positioned on the front edge tangent line and the rear edge tangent line of the power sprocket 54 are fixedly connected to the power chain 56, two travel limit switches 71 respectively positioned on the front edge and the rear edge of the power sprocket 54 are arranged on the frame, the travel limit switches 71 are respectively connected to the electrical control box 51 and respectively provide an electrical signal to the electrical control box 51 when being triggered; when the car 3 moves upwards to the uppermost floor leveling layer communicated with the derrick 2, the collision block 561 positioned at the tangent line of the rear edge of the power chain wheel 54 moves upwards to the power chain wheel 54 along with the power chain 56, and just triggers the travel limit switch 71 positioned at the rear edge of the power chain wheel 54; when the car 3 descends to the lowest floor level penetrated by the derrick 2, the collision block 561 positioned at the tangent line of the front edge of the power chain wheel 54 moves up to the power chain wheel 54 along the power chain 56 and just triggers the travel limit switch 71 positioned at the front edge of the power chain wheel 54.

In the above preferred embodiment, after the travel limit switch 71 is triggered, the electric control box 51 controls the servo motor 52 to stop. Obviously, the striking block 561 defines an upper limit of travel and a lower limit of travel of the car 3 in cooperation with the travel limit switch 71, respectively, so as to accurately limit the car within a prescribed safe travel range. Specifically, the travel limit switch 71 may be a microswitch.

Further, in the above preferred embodiment, two speed reducing switches 72 corresponding to the travel limit switches 71 one by one are disposed on the upper frame 4, the speed reducing switches 72 are respectively connected to the electrical control box 51 and respectively provide electrical signals to the electrical control box 51 when being triggered, and the speed reducing switches 72 are spaced below the travel limit switches 71 in the vertical direction so as to be triggered by the upward striking block 561 before the travel limit switches 71 are triggered. In specific implementation, after the speed reducing switch 72 is triggered, the electric control box 51 controls the servo motor 52 to operate in a speed reducing mode. Obviously, the speed reduction switch 72 forms a speed reduction region near the end of the stroke in the up-down stroke of the car 3, improving safety and comfort. Specifically, the travel limit switch 71 may be a microswitch.

Further, in the above preferred embodiment, two over-limit switches 73 corresponding to the travel limit switches 71 one by one are disposed on the upper frame 4, the over-limit switches 73 are respectively connected to the electrical control box 51 and respectively provide electrical signals to the electrical control box 51 when being triggered, and the over-limit switches 73 are spaced above the travel limit switches 71 in the vertical direction and then are triggered by the upward striking block 561 at the travel limit switches 71. Because the overrun switch 73 is positioned above the travel limit switch 71, the overrun switch 73 can be triggered only after the car 3 accidentally exceeds the safe travel range, and when the overrun switch 73 is triggered, an electric signal is provided to the electric control box 51 to serve as a main circuit switch signal of the system, so that emergency stop protection can be realized, and safe and reliable emergency stop is applied to the car 3 by matching with the self-locking function of the worm gear reducer 53. Specifically, the overrun switch 73 may be a microswitch or a proximity switch.

In the preferred embodiment, the door 20 is provided with an electrically controlled door lock 201 driven by the electrical control box 51, so that the door 20 is locked during the running of the car 3, and the safety accident caused by the false opening is prevented.

In a preferred embodiment, the derrick 2 is provided with detection switches 202 which are matched with the doors 20 one by one, the detection switches are respectively connected to the electric control box 51 and provide electric signals to the electric control box 51 after the doors 20 are closed, so that a control logic which can only run when the doors 20 are closed is constructed by matching with the electric control box 51, and the car 3 can be ensured to run safely. Specifically, the detection switch may be a micro switch or a proximity switch.

In a preferred embodiment, in the floor through which the derrick 2 passes, the damping block 8 positioned in the derrick 2 is arranged on the floor of the bottom floor, and the car 3 parked on the bottom floor is pressed on the damping block 8, so that damping and buffering are realized, the comfort level is improved, and the ground structure is protected.

Various other modifications and alterations of the structure and principles disclosed herein will be apparent to those skilled in the art and all such modifications and alterations are intended to be included within the scope of this invention.

Claims

1. Sprocket traction type villa elevator, including a vertical derrick that link up two at least floors in the building, vertical slip travel in the inside car of derrick, its characterized in that:

in the floors penetrated by the derrick, the top of the derrick is connected to the ceiling of the top floor, and the bottom of the derrick is connected to the floor of the bottom floor;

the top of the derrick is fixedly provided with an upper frame, an electric control box, a servo motor driven by the electric control box and a worm gear reducer driven by the servo motor are arranged in the upper frame, the edge of the upper frame is provided with a plurality of power chain wheels which are in running fit, and the servo motor is driven to be in synchronous transmission connection with the power chain wheels through the worm gear reducer; the bottom of the derrick is provided with a plurality of rotationally matched bottom idle wheels at the edge, and the bottom idle wheels and the power chain wheels are arranged in pairs in a one-to-one correspondence manner in the vertical direction;

the lift car is of an open structure with four walls without barriers, and a plurality of power chain wheels arranged in pairs and bottom idle wheels are arranged on the lift car to form a power chain in transmission fit with the power chain wheels; one end of the power chain is vertically and upwardly pulled to the rear edge of the matched power chain wheel, then sequentially winds the upper edge and the front edge of the power chain wheel, and vertically and downwardly detours to form a load end fixedly connected to the upper part of the lift car; the other end of the power chain is vertically pulled downwards to the rear edge of the bottom idler wheel, then sequentially winds around the lower edge and the front edge of the bottom idler wheel, and vertically detours upwards to form a hanging end; the lower part of the lift car is provided with a tensioning mechanism which elastically contracts in the vertical direction, and the lift car draws the hanging end of the power chain upwards through the tensioning mechanism so as to enable the power chain to be elastically tensioned on the power chain wheel and the bottom idle wheel; the electric control box drives the lift car to ascend and descend along the derrick to each floor penetrated by the derrick through the matching of a servo motor, a worm gear reducer, a power chain wheel, a bottom idler wheel and a power chain;

corresponding to the floor through which the derrick passes, calling buttons corresponding to each floor are arranged outside the derrick, compartment doors corresponding to each floor are arranged on the front wall of the derrick, and uplink/downlink operation buttons distributed on each floor are arranged on the inner wall of the derrick; an electric signal for requesting the car to stop at the floor corresponding to the calling button is input into the electric control box through the calling button, and an electric signal for requesting the elevator to go up/down to other floors is input into the electric control box through the up/down operation button.

2. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: the top of the lift car is provided with a square top frame, the bottom of the lift car is provided with a square bottom frame, and the lift car is also provided with a plurality of vertical rods which fixedly connect the top frame and the bottom frame along the vertical direction to form a three-dimensional frame structure; the vertical rods are in one-to-one correspondence with the power chains in the vertical direction, the load ends of the power chains are fixedly connected to the upper sections of the corresponding vertical rods, and the tensioning mechanisms are fixedly arranged on the lower sections of the vertical rods.

3. The sprocket traction type villa elevator as claimed in claim 2, characterized in that: the four corners of the top frame and the bottom frame of the lift car are aligned in the vertical direction to form vertical edges of the lift car, and the four corners of the top frame and the bottom frame of the lift car are respectively provided with a guide wheel set erected outwards, and each guide wheel set is provided with two rollers which are vertically crossed on a horizontal plane in the axial direction; the derrick is provided with four vertical upright posts which respectively correspond to the vertical edges of the cage, and each upright post is provided with two cylindrical surfaces which protrude inwards to form a right angle for matching; on the vertical edge of the car corresponding to the upright column, the rollers in the guide wheel set are respectively in corresponding rolling fit with the cylindrical surface of the upright column.

4. The sprocket traction type villa elevator as claimed in claim 3, characterized in that: the vertical rods are three and are respectively arranged on the vertical edges on the two sides of the front surface of the lift car and the vertical central line on the back surface of the lift car.

5. The sprocket traction type villa elevator as claimed in claim 3, characterized in that: the vertical rods are four and are respectively arranged on the vertical edges on the two sides of the front surface of the lift car and the vertical edges on the two sides of the back surface of the lift car.

6. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: the tensioning mechanism is provided with a guide sleeve fixedly connected to the upright rod and a pull rod vertically penetrating through the guide sleeve to form sliding fit, the upper end of the pull rod is in threaded connection with an adjusting nut, a cylindrical spring sleeved on the pull rod is arranged below the adjusting nut, the cylindrical spring is elastically compressed between the adjusting nut and the guide sleeve, and the hanging end of the power chain is connected to the lower end of the pull rod.

7. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: in one group of power chain wheels, bottom idle wheels and power chains which form the transmission fit of the chain wheels, two collision blocks which are respectively positioned on the front edge tangent line and the rear edge tangent line of the power chain wheels are fixedly connected on the power chain, two travel limit switches which are respectively arranged on the front edge and the rear edge of the power chain wheels are arranged on the rack, and the travel limit switches are respectively connected into the electric control box and respectively provide electric signals for the electric control box when being triggered; when the lift car moves upwards to the uppermost floor parallel layer communicated with the derrick, the collision block positioned on the rear edge tangent line of the power chain wheel moves upwards to the power chain wheel along the power chain, and a travel limit switch positioned on the rear edge of the power chain wheel is just triggered; when the lift car descends to the lowest floor leveling layer communicated with the derrick, the collision block positioned at the tangent line of the front edge of the power chain wheel ascends to the power chain wheel along with the power chain and just triggers the travel limit switch positioned at the front edge of the power chain wheel.

8. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: the upper frame is provided with two speed reducing switches which are in one-to-one correspondence with the travel limit switches, the speed reducing switches are respectively connected into the electric control box and respectively provide electric signals for the electric control box when being triggered, and the speed reducing switches are arranged below the travel limit switches along the vertical direction at intervals and are triggered by an ascending collision block before the travel limit switches.

9. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: the upper rack is provided with two limit switches which correspond to the travel limit switches one by one, the limit switches are respectively connected into the electric control box and respectively provide electric signals for the electric control box when being triggered, and the limit switches are triggered by the collision blocks which are upward behind the travel limit switches along the vertical direction at intervals above the travel limit switches.

10. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: the carriage door is provided with an electric control door lock driven by an electric control box.

11. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: the derrick is provided with detection switches which are matched with the compartment doors one by one, and the detection switches are respectively connected into the electric control box and provide electric signals to the electric control box after the compartment doors are closed.

12. The sprocket traction type villa elevator as claimed in claim 1, characterized in that: in the floor where the derrick passes through, the floor of the bottom floor is provided with a damping block positioned in the derrick, and the cage stopping at the bottom floor is pressed on the damping block.