Screw-driven household elevator

Abstract

The present invention relates to a screw-driven household elevator, comprising a hoistway, a car, a spiral lifting block, a screw, a motor drive unit and a range-extending mechanism. The range-extending mechanism comprises a load-bearing member, a movable pulley block, a fixed pulley block and a pulling member. The load-bearing member is fixedly connected to the top wall of the hoistway. The motor drive unit is used to drive the screw. The screw is arranged directly in front of the load-bearing member. The spiral lifting block is sleeved on the screw, and it moves up and down along the screw, and a through-shaped threaded hole adapted to the screw is opened on it. The movable pulley block is composed of a plurality of linearly arranged movable pulleys. The movable pulley is fixed on the spiral lifting block and moves synchronously with the spiral lifting block. The fixed pulley block is arranged directly below the movable pulley block, and it is composed of a plurality of fixed pulleys fixed on the load-bearing member. The pulling member is sequentially wound around the fixed pulley and the movable pulley, and its fixed end is fixed to the load-bearing member, and its pulling end drags the car to move.

Description

Technical Field

[0001] The invention relates to the technical field of home elevator manufacturing, in particular to a screw-driven home elevator. Background Art

[0002] With the development of economy, the utilization rate of elevators in service industry and residents' life is getting higher and higher, resulting in the increasing use of elevators. In order to ensure the smooth operation and service life of elevators, the requirements for the transmission control device of elevators are high. Screw elevators adopt the screw transmission method, and the transmission control device is simple and easy to control. It is more and more widely used in home elevators.

[0003] In the prior art, a screw ladder includes a shaft, a car, a screw, a screw matched with the screw, and a motor drive unit. When the motor drive unit is activated, the screw is driven to rotate around its central axis, thereby driving the screw to move back and forth in the up and down directions, while the car is fixed to the screw and moves synchronously with it. However, this solution has the following problems: Figure 1 As shown in , the length of the screw required in the above technical solution is basically consistent with the length of the shaft (at least not less than the limit stroke of the car), which leads to slightly poor overall rigidity, and further makes the car very easy to shake during the displacement process, affecting the riding comfort of passengers. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a screw-driven household elevator, wherein the screw length is relatively short, thereby ensuring that the elevator has better stability during operation.

[0005] In order to solve the above technical problems, the present invention relates to a screw-driven household elevator, which includes a hoistway, a car and a car drive unit. The car drive unit includes a spiral lifting block, a screw, a motor drive unit and a range-extending mechanism. The range-extending mechanism includes a load-bearing member, a movable pulley group, a fixed pulley group and a pulling member. The load-bearing member is vertically placed and fixed to the top wall of the hoistway. The motor drive unit is arranged at the top of the hoistway to drive the screw to perform circumferential rotation around its central axis. The screw is arranged directly in front of the load-bearing member. The spiral lifting block is sleeved on the screw, and it moves up and down along the screw, and a through-shaped threaded hole adapted to the screw is opened on it. The movable pulley group is composed of a plurality of movable pulleys linearly arranged in the up and down direction. The movable pulley is detachably fixed to the left / right side wall of the spiral lifting block, and moves synchronously with the spiral lifting block. The fixed pulley block is arranged directly below the movable pulley block, and is composed of a plurality of fixed pulleys arranged in an up-down direction and detachably fixed to the load-bearing member. The pulling member is wound around the fixed pulley and the movable pulley in sequence, and its fixed end is fixed to the load-bearing member, while its pulling end drags the car to move in the up-down direction.

[0006] As a further improvement of the technical solution of the present invention, the number of the range-extending mechanisms is set to 2, and they are symmetrically arranged on the left and right sides of the spiral lifting block.

[0007] As a further improvement of the technical solution of the present invention, for the single-sided range-extending mechanism, the number of movable pulleys is 3 and the number of fixed pulleys is 2.

[0008] As a further improvement of the technical solution of the present invention, the car driving unit further includes an auxiliary support plate. The number of the auxiliary support plates is set to 2, which are symmetrically arranged on the left and right sides of the load-bearing member. Both ends of the auxiliary support plate are detachably connected to the load-bearing member and the hoistway by means of fasteners.

[0009] As a further improvement of the technical solution of the present invention, the range-extending mechanism further includes a rope-blocking rod assembly. The rope-blocking rod assembly is composed of a plurality of rope-blocking rods arranged around the outer periphery of the movable pulley and the fixed pulley.

[0010] As a further improvement of the technical solution of the present invention, the pulling member is preferably a steel belt.

[0011] As a further improvement of the technical solution of the present invention, the range-extending mechanism further includes a guide roller assembly. The guide roller assembly includes a left guide roller and a right guide roller. The left guide roller and the right guide roller are respectively pivotally connected to the left and right side walls of the spiral lifting block, and always abut against the load-bearing member to roll freely.

[0012] As a further improvement of the technical solution of the present invention, the left guide roller is formed by the left guide roller body and the left rubber wheel rim sleeve being inlaid together. The right guide roller is formed by the right guide roller body and the right rubber wheel rim sleeve being inlaid together.

[0013] Compared with the screw-driven household elevator with a traditional design structure, in the technical solution disclosed in the present invention, an additional range-extending mechanism is provided. When the motor drive unit is in motion, the drive screw performs circumferential rotational motion around its central axis, thereby driving the spiral lifting block to perform reciprocating displacement motion in the up and down directions, while the movable pulley assembly is fixed to the spiral lifting block and follows the synchronous motion. Assuming that the distance of the spiral lifting block in the up and down directions in one operation is a, the displacement distance of the car is n×a, where n is the range-extending coefficient. In this way, on the one hand, the overall design length of the screw is effectively shortened, so that it has a higher rigidity and ensures the smooth operation of the elevator; on the other hand, the range-extending mechanism itself has a larger reduction ratio, thereby effectively reducing the overall design size of the car drive unit, which is conducive to spatial layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a three-dimensional schematic diagram of a screw-driven household elevator in the prior art.

[0016] Figure 2 It is a three-dimensional schematic diagram of the screw-driven household elevator of the present invention.

[0017] Figure 3 It is a three-dimensional schematic diagram of a first embodiment of the range-extending mechanism in a screw-driven household elevator of the present invention.

[0018] Figure 4 yes Figure 3 main view.

[0019] Figure 5 yes Figure 4 AA section view.

[0020] Figure 6 It is a stereoscopic schematic diagram of a second embodiment of the range-extending mechanism in a screw-driven household elevator of the present invention.

[0021] 1-hoistway; 2-car; 3-car drive unit; 31-screw lifting block; 32-screw; 33-motor drive unit; 34-range extension mechanism; 341-load-bearing member; 342-movable pulley block; 3421-movable pulley; 343-fixed pulley block; 3431-fixed pulley; 344-pulling member; 345-rope stop rod assembly; 3451-rope stop rod; 346-guide roller assembly; 3461-left guide roller; 3462-right guide roller; 35-protective cover. DETAILED DESCRIPTION

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "left", "right", "front", "back", "up", "down", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] In order to facilitate those skilled in the art to fully understand the technical solutions disclosed in the present invention, the present invention is further described in detail below in conjunction with specific embodiments. Figure 2 FIG. 1 shows a three-dimensional schematic diagram of a screw-driven household elevator of the present invention. It can be seen that the elevator is mainly composed of a hoistway 1, a car 2 (only the car bracket is shown in the figure), and a car drive unit 3. The car drive unit 3 includes a spiral lifting block 31, a screw 32, a motor drive unit 33, and a range-extending mechanism 34 (such as Figure 3 ). When the motor drive unit 33 is in motion, the drive screw 32 performs circumferential rotation around its central axis, thereby driving the spiral lifting block 31 to perform reciprocating displacement along the up-down direction. At the same time, the range-extending mechanism 34 performs corresponding motion. Assuming that the distance of the spiral lifting block 31 along the up-down direction in one operation is a, the displacement distance of the car 2 is n×a, where n is the range-extending coefficient of the range-extending mechanism 34. In this way, on the one hand, the overall design length of the screw 32 is effectively shortened, so that it has higher rigidity and ensures the smooth operation of the elevator; on the other hand, the range-extending mechanism itself has a larger reduction ratio, thereby effectively reducing the overall design size of the car drive unit, which is conducive to spatial layout.

[0024] It is known that a variety of means can be used to achieve the structural design of the above-mentioned range-extending mechanism 34. However, a preferred solution with simple structural design, easy implementation, and high convenience for later maintenance is recommended here, which is as follows: Figure 4 , 5The three-dimensional schematic diagram and AA cross-sectional view of the range-extending mechanism in the screw-driven household elevator of the present invention are respectively shown. It can be seen that it is mainly composed of a load-bearing member 341, a movable pulley group 342, a fixed pulley group 343 and a pulling member 344. Among them, the load-bearing member 341 is in a vertical position and is detachably fixed to the top wall of the shaft 1. The motor drive unit 33 is arranged and installed on the top of the shaft 1 to drive the screw 32 to perform circumferential rotation around its central axis. The screw 32 is arranged in front of the load-bearing member 341. The spiral lifting block 31 is sleeved on the screw 32, which performs circumferential spiral motion around the screw 32, and a through-shaped threaded hole adapted to the screw 32 is opened on it. The movable pulley group 342 is composed of three movable pulleys 3421 arranged linearly along the up and down directions. The movable pulley 3421 is detachably fixed to the spiral lifting block 31 and performs synchronous displacement motion with the spiral lifting block 31. The fixed pulley group 343 is arranged directly below the movable pulley group 342, and is composed of two fixed pulleys 3431 arranged in an up-down direction and detachably fixed to the load-bearing member. The pulling member 344 is wound around the fixed pulley 3431 and the movable pulley 3421 in sequence, and its fixed end is fixed to the load-bearing member 341, while its pulling end drags the car 2 to move in the up-down direction.

[0025] It should be noted that the above-mentioned range-increasing coefficient n is in a one-to-one correspondence with the specific number of the movable pulleys 3421. Therefore, the specific number of the above-mentioned movable pulleys 3421 and the corresponding fixed pulleys 3431 needs to be set according to the specific value of the range-increasing coefficient n.

[0026] In order to ensure the balance of the drag force on the car 2 during actual operation and avoid the occurrence of "biased pulling", the number of the above-mentioned range-extending mechanisms 34 is preferably set to 2, and they are symmetrically arranged on the left and right sides of the spiral lifting block 31. The movable pulleys 3421 are grouped in pairs and symmetrically fixed on the left and right side walls of the spiral lifting block 31. The fixed pulleys 3431 are grouped in pairs and symmetrically fixed on the left and right side walls of the load-bearing member 341 (such as Figure 3 , 4 ).

[0027] In addition, by Figure 3 It can be clearly seen that the motor drive unit 33 is composed of a rotating motor and a reduction gearbox. Of course, as a modified design of the above technical solution, the motor drive unit 33 can also be preferably a direct-drive voice coil motor according to actual conditions, thereby effectively reducing the demand for installation space and significantly reducing the elevator failure rate.

[0028] It is known that in the actual operation of the home elevator, the load-bearing member 341 will inevitably "shake", which will cause working noise and even affect the normal operation of the range-extending mechanism 34. In view of this, the above-mentioned car drive unit 3 can also be equipped with an auxiliary support plate (not shown in the figure) according to actual conditions. The number of auxiliary support plates is set to 2, which are symmetrically arranged on the left and right sides of the load-bearing member 341. The auxiliary support plate is connected and fixed between the load-bearing member 341 and the shaft 1.

[0029] Considering the convenience of subsequent removal and replacement of the auxiliary support plate, the auxiliary support plate is preferably connected to the load-bearing member 341 and the shaft 1 by means of fastening screws. The load-bearing member 341 is provided with a threaded hole adapted to the fastening screw; corresponding to the threaded hole, a connecting through hole (not shown in the figure) for the fastening screw to pass through is provided on the auxiliary support plate.

[0030] Furthermore, in order to facilitate the adjustment of the inclination of the load-bearing member 341 to ensure that it is always kept in a vertical position, as a further optimization of the above technical solution, the above-mentioned connecting through hole is preferably a long waist-shaped hole, and extends along the left and right direction. In this way, during the initial installation of the load-bearing plate 341 and the subsequent maintenance process, after the relative position of the load-bearing member 341 is adjusted in place, the fastening screws can be locked on the long waist-shaped hole in a timely manner.

[0031] It is known that steel belts have at least the following advantages over steel wire ropes: 1) The contact area of ​​steel belts is large and the transmission efficiency is high; 2) There is no need for regular maintenance; 3) The service life of steel belts is 2-3 times longer than that of traditional steel wire ropes; 4) The flexibility of steel belts is good and can effectively reduce the vibration generated during elevator operation; 5) Under the same tensile force conditions, the weight of steel belts is more than 20% lighter than that of traditional steel wire ropes. In view of this, the pulling member 344 is preferably a steel belt.

[0032] It is known that at the initial start or stop moment of the motor drive unit 33, the steel belt will inevitably "jump" relative to the movable pulley 3421 and the fixed pulley 3431. In view of this, the above-mentioned car drive unit can also be additionally provided with a rope blocking rod assembly 345 according to actual conditions. The rope blocking rod assembly 345 is composed of a plurality of rope blocking rods 3451 arranged around the outer periphery of the above-mentioned movable pulley 3421 and the fixed pulley 3431.

[0033] As a further optimization of the screw-driven household elevator structure, a guide roller assembly 346 may be added according to actual conditions. The guide roller assembly 36 includes a left guide roller 3461 and a right guide roller 3462. The left guide roller 3461 and the right guide roller 3462 are respectively pivoted to the left and right side walls of the spiral lifting block 31, and always abut against the load-bearing member 341 to roll freely (such as Figure 3 ,4 , 5). In this way, the displacement stability of the spiral lifting block 31 is effectively improved, ensuring that the efficiency of the range-extending mechanism 34 is maximized.

[0034] It should be noted that the left guide roller 3461 is preferably formed by the left guide roller body and the left rubber wheel rim sleeve. The right guide roller 3462 is preferably formed by the right guide roller body and the right rubber wheel rim sleeve (not shown in the figure). The presence of the left rubber wheel rim sleeve and the right rubber wheel rim sleeve not only effectively reduces the working noise of the spiral lifting block 31 during the displacement process, but also increases the relative friction between the left guide roller 3461, the right guide roller 3462 and the load-bearing member 341, thereby avoiding the occurrence of the "slip" phenomenon.

[0035] Figure 6 The three-dimensional schematic diagram of the second embodiment of the range-extending mechanism in the screw-driven household elevator of the present invention is shown. The only difference between the second embodiment and the first embodiment is that an additional protective cover 35 is provided, which is arranged on the periphery of the range-extending mechanism 34. And the protective cover 35 is detachably fixed to the load-bearing member 341 by means of screws. By adopting the above technical solution, it is possible to effectively prevent external dust or debris from entering the interior of the range-extending mechanism 34. In this way, on the one hand, it is ensured that the range-extending mechanism 34 is always maintained in a stable and normal operating state; on the other hand, the wear rate of the steel belt, the movable pulley and the fixed pulley is reduced as much as possible, thereby increasing the service life and reducing the frequency of later maintenance of the range-extending mechanism 34.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A screw-driven household elevator, characterized in that: The invention comprises a hoistway, a car and a car driving part; the car driving part comprises a spiral lifting block, a screw, a motor driving part and a range-extending mechanism; the range-extending mechanism comprises a load-bearing member, a movable pulley group, a fixed pulley group and a pulling member; the load-bearing member is vertically placed and fixed to the top wall of the hoistway; the motor driving part is arranged at the top of the hoistway to drive the screw to rotate circumferentially around its central axis; the screw is arranged in front of the load-bearing member; the spiral lifting block is sleeved on the screw, and moves up and down along the screw, and a screw adapted to the screw is provided on the screw. The movable pulley block is composed of a plurality of movable pulleys arranged linearly along the up-down direction; the movable pulley is detachably fixed to the left / right side wall of the spiral lifting block, and moves synchronously with the spiral lifting block; the fixed pulley block is arranged directly below the movable pulley block, and is composed of a plurality of fixed pulleys arranged in an array along the up-down direction and detachably fixed to the load-bearing member; the pulling member is sequentially wound around the fixed pulley and the movable pulley, and its fixed end is fixed to the load-bearing member, and its pulling end drags the car to move along the up-down direction; The car driving part also includes an auxiliary support plate; the number of the auxiliary support plates is set to 2, and they are symmetrically arranged on the left and right sides of the load-bearing member; both ends of the auxiliary support plate are detachably connected to the load-bearing member and the hoistway by means of fasteners; The range-extending mechanism further includes a rope-blocking rod assembly; the rope-blocking rod assembly is composed of a plurality of rope-blocking rods arranged around the outer periphery of the movable pulley and the fixed pulley; The pulling member is a steel belt; The range-extending mechanism also includes a guide roller assembly; the guide roller assembly includes a left guide roller and a right guide roller; the left guide roller and the right guide roller are respectively pivotally connected to the left and right side walls of the spiral lifting block, and always stick to the load-bearing member to roll freely.

2. The screw-driven household elevator according to claim 1, characterized in that: The number of the range-extending mechanisms is set to 2, and they are symmetrically arranged on the left and right sides of the spiral lifting block.

3. The screw-driven household elevator according to claim 2, characterized in that: For the single-side range-extending mechanism, the number of the movable pulleys is 3, and the number of the fixed pulleys is 2.

4. The screw-driven household elevator according to claim 1, characterized in that: The left guide roller is formed by the left guide roller body and the left rubber wheel rim sleeve being inlaid together; the right guide roller is formed by the right guide roller body and the right rubber wheel rim sleeve being inlaid together.

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