阅读说明：本技术 下置式曳引机 (Underneath type traction machine ) 是由 李云波 李力 陆华成 万少帝 于 2021-07-27 设计创作，主要内容包括：一种下置式曳引机,属于电梯设施技术领域。包括一曳引机总成和一进道安装架,曳引机总成设置在井道安装架上,特点：所述井道安装架包括一井道固定底板、一左导轨固定板和一右导轨固定板,井道固定底板呈矩形的板状体构造,左导轨固定板以及右导轨固定板彼此左右对应并且以垂直于井道固定底板的状态与井道固定底板朝向上的一侧固定,左导轨固定板与右导轨固定板之间的空间构为安装架导向腔,曳引机总成对应于安装架导向腔且在与左导轨固定板与右导轨固定板的相向一侧滑动配合的状态下设在井道安装架上。优点：减少返绳轮的数量,缩短曳引绳的长度,简化结构；合理缩小井道矩形面积尺寸,增进对轿厢的牵引作用的效果。(An underlying traction machine belongs to the technical field of elevator facilities. Including a hauler assembly and an approach mounting bracket, the hauler assembly sets up on the well mounting bracket, characteristics: the well mounting bracket includes a well PMKD, a left guide rail fixed plate and a right guide rail fixed plate, well PMKD is the platelike body structure of rectangle, left side guide rail fixed plate and right guide rail fixed plate correspond and fixed with one side of well PMKD up with the state of perpendicular to well PMKD each other about, space structure between left side guide rail fixed plate and the right guide rail fixed plate is mounting bracket direction chamber, the hauler assembly is corresponding to mounting bracket direction chamber and establishes on the well mounting bracket under one side sliding fit's state in opposite directions with left guide rail fixed plate and right guide rail fixed plate. The advantages are that: the number of the return rope wheels is reduced, the length of a hoisting rope is shortened, and the structure is simplified; the rectangular area size of the well is reasonably reduced, and the effect of traction on the lift car is improved.)

1. The utility model provides a put formula hauler under, includes a hauler assembly (1) and an approach mounting bracket (2), hauler assembly (1) sets up on well mounting bracket (2), its characterized in that well mounting bracket (2) include a well PMKD (21), a left guide rail fixed plate (22) and a right guide rail fixed plate (23), well PMKD (21) are the platelike body structure of rectangle, left guide rail fixed plate (22) and right guide rail fixed plate (23) control each other and correspond and with the state of perpendicular to well PMKD (21) fixed with one side of well PMKD (21) upwards orientation, the space between left guide rail fixed plate (22) and right guide rail fixed plate (23) constitutes for mounting bracket direction chamber (24), hauler assembly (1) corresponds to mounting bracket direction chamber (24) and sets up under the state with the one side sliding fit in opposite directions of left guide rail fixed plate (22) and right guide rail fixed plate (23) in the well On the track mounting frame (2).

2. The lower traction machine according to claim 1, wherein a pair of left guide rails (221) are fixed at intervals in a longitudinal direction on a side of the left guide rail fixing plate (22) facing the right guide rail fixing plate (23), and a pair of right guide rails (231) are fixed at intervals in a longitudinal direction on a side of the right guide rail fixing plate (23) facing the left guide rail fixing plate (22) at positions corresponding to the pair of left guide rails (221), and the traction machine assembly (1) is provided on the hoistway-mounting bracket (2) in a state of being slidably fitted in the bracket guide chamber (24) to opposite sides of the pair of left guide rails (221) and the pair of right guide rails (231).

3. The lower traction machine according to claim 2, wherein the traction machine assembly (1) comprises a traction machine (11), a traction sheave (12) and a traction machine counterweight (13), the traction sheave (12) is fixed on a traction machine power output shaft (111) of the traction machine (11), a traction rope (10) is wound on the traction sheave (12), and the traction machine counterweight (13) is fixed at the bottom of the traction machine (11) and is in sliding fit with the opposite sides of the left guide rails (221) and the right guide rails (231) in the mounting frame guide cavity (24) by the traction machine (11) and the traction machine counterweight (13); and a traction machine upper displacement limit position signal collector (3) and a traction machine lower displacement limit position signal collector (4) are fixed on one side of the right guide rail fixing plate (23) facing the left guide rail fixing plate (22) or one side of the left guide rail fixing plate (22) facing the right guide rail fixing plate (23), the traction machine upper displacement limit position signal collector (3) corresponds to the upper part of the edge part of the traction machine (11), and the traction machine lower displacement limit position signal collector (4) corresponds to the lower part of the edge part of the traction machine (11).

4. The lower mounted type traction machine as claimed in claim 2 or 3, wherein the pair of left guide rails (221) each have a left guide rail fixing base plate (2211), the left guide rail fixing base plate (2211) is fixed to the side of the left guide rail fixing plate (22) facing the right guide rail fixing plate (23) by a left guide rail fixing base plate screw (22111), the pair of right guide rails (231) each have a right guide rail fixing base plate (2311), and the right guide rail fixing base plate (2311) is fixed to the side of the right guide rail fixing plate (23) facing the left guide rail fixing plate (22) by a right guide rail fixing base plate screw (23111).

5. The overhead hoist according to claim 3, wherein a pair of left shoes (112) are fixed to the left side of the hoist (11) at positions corresponding to each of the pair of left guide rails (221), the left shoes (112) being positioned vertically corresponding to each other, the left shoes (112) being slidably fitted to the left guide rails (221); a pair of right guide shoes (113) are fixed to the right side of the hoisting machine (11) at positions corresponding to each of the pair of right guide rails (231), and the pair of right guide shoes (113) are slidably fitted to the pair of right guide rails (231).

6. The lower traction machine as claimed in claim 5, wherein the pair of left guide shoes (112) each have a left guide shoe cavity, a pair of left guide shoes (1121) are fixed in the left guide shoe cavities in a state of facing each other, and the pair of left guide shoes (1121) are slidably engaged with both sides of the pair of left guide rails (221); the pair of right guide shoes (113) each have a right guide shoe cavity, a pair of right guide rail bushes (1131) are fixed in the right guide shoe cavity in a state of facing each other, and the pair of right guide shoe bushes (1131) are in sliding fit with both sides of the pair of right guide rails (231).

7. The lower traction machine according to claim 3, wherein the upper displacement limit position signal collector (3) of the traction machine and the lower displacement limit position signal collector (4) of the traction machine are fixed on one side of the right guide rail fixing plate (23) facing the left guide rail fixing plate (22), an upper collision plate (114) is fixed on the upper part of the right side of the front end of the traction machine (11), the right end of the upper collision plate (114) corresponds to the lower part of the upper displacement limit position signal collector (3) of the traction machine, a lower collision plate (115) is fixed on the lower part of the right side of the front end of the traction machine (11), and the right end of the lower collision plate (115) corresponds to the upper part of the lower displacement limit position signal collector (4) of the traction machine; the traction machine (11) is provided with a pair of traction machine working power supply connecting posts (116).

8. The traction machine as claimed in claim 7, wherein the traction machine upper displacement limit position signal collector (3) is fixed on an upper impact bow (31), the traction machine lower displacement limit position signal collector (4) is fixed on a lower impact bow (41), and the upper impact bow (31) and the lower impact bow (41) are fixed on the side of the right guide rail fixing plate (23) facing the left guide rail fixing plate (22); the traction machine upper displacement limit position signal collector (3) and the traction machine lower displacement limit position signal collector (4) are microswitches, travel switches, position proximity switches, reed pipes or Hall sensing elements.

9. The lower traction machine according to claim 7, wherein the traction machine counterweight (13) is composed of a plurality of metal plates stacked from bottom to top and fixed to the bottom of the traction machine (11) by a set of counterweight fixing bolts (131).

10. The lower traction machine according to claim 1, 2, or 3, wherein a fixing plate mounting bolt (211) is provided at each of a left side edge portion and a right side edge portion of the hoistway fixing base plate (21).

Technical Field

The invention belongs to the technical field of elevator facilities, and particularly relates to a lower traction machine.

Background

The aforementioned lower-mounted type traction machine is explained in terms of words and known in conjunction with the common general knowledge, and the position of the traction machine is selected in a lower part of a hoistway (also referred to as "hoistway bottom") such as a pit of an elevator hoistway.

As is known in the art, the ratio of the running speed of the hoisting rope of the hoisting machine to the running speed of the car is a hoisting ratio. Fig. 4 shows a conventional lower-mounted type traction machine, and the structure of fig. 4 is widely used at present, a traction machine assembly 1 is provided at a lower portion of a hoistway, one end of a traction rope 10 is connected to a top portion of a car 20, the other end is connected to an upper portion of a balance weight 40 through a plurality of return sheaves 30 provided on an upper cross member of an upper portion of the hoistway and after passing through a traction sheave of the traction machine assembly 1, and a compensating chain 50 is connected between a lower portion of the balance weight 40 and a bottom portion of the car 20. As can be seen from the structure shown in fig. 4, the ratio of the traveling speed of the hoist rope 10 to the traveling speed of the cage 20 is 1: 1. Fig. 5 shows another type of the conventional traction machine, in which a traction machine assembly 1 is installed in a lower portion of a hoistway, one end of a traction rope 10 is fixed to an upper cross member installed in an upper portion of the hoistway, and the other end thereof passes through a car return sheave 201 installed in the upper portion of the car 20, and one return sheave of each of a plurality of (three) return sheaves 30 installed in the upper cross member, which are respectively located at both sides, a traction sheave of the traction machine assembly 1, one return sheave located in the middle of one of the plurality of (three) return sheaves 30, and a counterweight return sheave 401 installed above a counterweight 40, and is fixed to the upper cross member (by a rope head fixing connector, the same as described above), and a compensating chain 50 is connected between a lower portion of the counterweight 40 and a bottom portion of the car 20. As can be seen from the structure shown in fig. 5, the ratio of the traveling speed of the traction sheave 10 to the traveling speed of the cage 20 is 2: 1.

Since the hoisting ropes 10 of the above-described structure shown in fig. 4 and 5 have a substantially S-shaped winding form, the hoisting ropes 10 are lengthy on the one hand, and relatively complicated in overall structure on the other hand, and the hoisting ropes 10 are elongated due to the lapse of time, thereby being compensated by the compensating chain 50. In particular, since the hoisting machine is biased by the large number of hoisting ropes, the hoisting machine assembly 1 cannot be positioned at the center of the lower part of the hoistway, and the effect of the hoisting machine assembly 1 as a power mechanism on the car 20 by the hoisting ropes 10 is affected.

Technical information on the lower-mounted type traction machine, such as CN1035989C (traction sheave elevator with drive device under), CN112499428A (external drive shaft elevator with traction machine under), CN203173653U (lower-mounted structure device of 4: 1 machine room free cargo elevator traction machine), and CN112499429A (a traction machine lower-mounted construction elevator applicable to hoistway of building), etc., can be found in the published chinese patent documents. A typical "large span tower elevator" as recommended in CN201089687Y, which recommends a structure in which a hoisting rope is connected to a car and a counterweight (i.e., a "counterweight", the same example as above) through a return sheave from the lower part to the top, respectively, has the following disadvantages: the length of a hoisting rope (called a steel wire rope in the patent) is obviously increased and is finally converted into the mass (weight) of the system; the number of the upper return rope wheels is increased at the top, so that the structure is complex, and the mechanical efficiency is reduced; because the traction machine and the control system need to be provided with a machine room on the side surface, the occupied space is large; the upper beam on the top is stressed greatly, for example, the mass of the system is doubled; the requirement on the static load force of the shaft of the tractor assembly is strict.

In view of the above-mentioned drawbacks of the prior art, it is necessary to improve the technology, which will be described below, in this context.

Disclosure of Invention

The object of the present invention is to provide a lower-mounted hoist which is advantageous in shortening the length of a hoist rope and in reducing the number of return sheaves to significantly simplify the structure, in which a hoist assembly is centered in the lower part of a hoistway in a use state to reduce the rectangular area of the hoistway reasonably and improve the effect of traction on a car, and in which a compensating chain for compensating for the elongation of the hoist rope occurring over time is eliminated by facilitating the hoist rope to be always in a good tension state.

The invention aims to solve the problem that the traction machine assembly is arranged on the hoistway mounting frame, and the traction machine assembly is characterized in that the hoistway mounting frame comprises a hoistway fixing bottom plate, a left guide rail fixing plate and a right guide rail fixing plate, the hoistway fixing bottom plate is of a rectangular plate-shaped body structure, the left guide rail fixing plate and the right guide rail fixing plate correspond to each other left and right and are fixed with one side, facing upwards, of the hoistway fixing bottom plate in a state of being perpendicular to the hoistway fixing bottom plate, a space between the left guide rail fixing plate and the right guide rail fixing plate is formed into a mounting frame guide cavity, and the traction machine assembly corresponds to the mounting frame guide cavity and is arranged on the hoistway mounting frame in a state of being in sliding fit with the opposite side of the left guide rail fixing plate and the right guide rail fixing plate.

In a specific embodiment of the present invention, a pair of left guide rails is fixed to a side of the left guide rail fixing plate facing the right guide rail fixing plate at a longitudinal interval, a pair of right guide rails is fixed to a side of the right guide rail fixing plate facing the left guide rail fixing plate at a longitudinal interval at positions corresponding to the pair of left guide rails, and the hoist assembly is provided on the hoistway-mounting bracket in a state of being slidably fitted to opposite sides of the pair of left guide rails and the pair of right guide rails in the bracket guide chamber.

In another specific embodiment of the invention, the traction machine assembly comprises a traction machine, a traction sheave and a traction machine counterweight, the traction sheave is fixed on a traction machine power output shaft of the traction machine, a traction rope is wound on the traction sheave, the traction machine counterweight is fixed at the bottom of the traction machine and is in sliding fit with the opposite sides of the left guide rails and the right guide rails in the mounting rack guide cavity together with the traction machine counterweight; and a traction machine upper displacement limit position signal collector and a traction machine lower displacement limit position signal collector are fixed on one side of the right guide rail fixing plate facing the left guide rail fixing plate or one side of the left guide rail fixing plate facing the right guide rail fixing plate, the traction machine upper displacement limit position signal collector corresponds to the upper part of the edge part of the traction machine, and the traction machine lower displacement limit position signal collector corresponds to the lower part of the edge part of the traction machine.

In yet another embodiment of the present invention, the pair of left guide rails each have a left guide rail fixing base plate fixed to a side of the left guide rail fixing plate facing the right guide rail fixing plate by a left guide rail fixing base plate screw, and the pair of right guide rails each have a right guide rail fixing base plate fixed to a side of the right guide rail fixing plate facing the left guide rail fixing plate by a right guide rail fixing base plate screw.

In still another specific embodiment of the present invention, a pair of left guide shoes, which are positioned to correspond up and down to each other, are fixed to the left side of the traction machine at positions corresponding to each of the pair of left guide rails, and are slidably engaged with the pair of left guide rails; a pair of right guide shoes, which are positioned up and down with respect to each other and slidably engaged with the pair of right guide rails, are fixed to the right side of the traction machine at positions corresponding to each of the pair of right guide rails.

In still another specific embodiment of the present invention, the pair of left guide shoes each have a left guide shoe cavity in which a pair of left guide shoes are fixed in a state of facing each other, the pair of left guide shoes being slidably fitted to both sides of the pair of left guide rails; the pair of right guide shoes are respectively provided with a right guide shoe cavity, a pair of right guide rail linings are fixed in the right guide shoe cavities in a mutually facing state, and the pair of right guide rail linings are in sliding fit with two sides of the pair of right guide rails.

In a more specific embodiment of the present invention, the upper-displacement limit position signal collector of the traction machine and the lower-displacement limit position signal collector of the traction machine are fixed on one side of the right guide rail fixing plate facing the left guide rail fixing plate, an upper striking plate is fixed on the upper part of the right side of the front end of the traction machine, the right end of the upper striking plate corresponds to the lower part of the upper-displacement limit position signal collector of the traction machine, a lower striking plate is fixed on the lower part of the right side of the front end of the traction machine, and the right end of the lower striking plate corresponds to the upper part of the lower-displacement limit position signal collector of the traction machine; the tractor is provided with a pair of tractor working power supply connecting posts.

In a further specific embodiment of the invention, the traction machine upper displacement limit position signal collector is fixed on an upper impact bow, the traction machine lower displacement limit position signal collector is fixed on a lower impact bow, and the upper impact bow and the lower impact bow are fixed on one side of the right guide rail fixing plate facing the left guide rail fixing plate; the traction machine upper displacement limit position signal collector and the traction machine lower displacement limit position signal collector are microswitches, travel switches, position proximity switches, reed pipes or Hall sensing elements.

In a still more specific embodiment of the present invention, the traction machine counterweight is composed of a plurality of metal plates stacked from bottom to top and fixed to the bottom of the traction machine by a set of counterweight fixing bolts.

In still another specific embodiment of the present invention, a fixing plate mounting bolt is provided at each of a left side edge portion and a right side edge portion of the hoistway fixing base plate.

The technical scheme provided by the invention has the technical effects that: the traction machine assembly corresponds to the mounting rack guide cavity of the shaft mounting rack and is arranged on the shaft mounting rack in a state of sliding fit with the opposite side of the left guide rail fixing plate and the right guide rail fixing plate, so that the traction machine assembly has an up-and-down floating effect, and the traction machine assembly not only contributes to reducing the number of the return rope wheels in a use state, but also contributes to obviously shortening the length of a traction rope, and simplifies the structure; in a use state, the number of the upward return rope wheels is obviously reduced, so that the shaft mounting frame and the traction machine assembly are arranged in the middle of the lower part of the shaft, the rectangular area size of the shaft can be reasonably reduced, and the effect of traction on the lift car can be enhanced; because the weight of the tractor is fixed below the tractor of the structure system of the tractor assembly and the tractor assembly can float up and down to displace, the extension allowance of the extension of the traction rope can not be withdrawn, and the compensation chain in the prior art can be abandoned.

Drawings

FIG. 1 is a block diagram of an embodiment of the present invention.

Fig. 2 is a schematic view from the rear side of fig. 1.

Fig. 3 is a schematic view illustrating an application of the present invention.

Fig. 4 is a schematic view of a traction machine of a prior art.

Fig. 5 is a schematic view of another type of a traction machine of the prior art.

Detailed Description

In order to clearly understand the technical spirit and the advantages of the present invention, the following detailed description is given by way of examples, but the description of the examples is not intended to limit the scope of the present invention, and any equivalent changes made according to the present inventive concept, which are merely in form and not in substance, should be considered as the scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of fig. 1, and thus, it should not be understood as a specific limitation to the technical solution provided by the present invention.

Referring to fig. 1 and 2, there is shown a traction machine assembly 1 and an access mounting bracket 2, the traction machine assembly 1 being mounted on the hoistway mounting bracket 2.

The technical key points of the technical scheme provided by the invention are as follows: the hoistway-mounting bracket 2 includes a hoistway-fixing base plate 21, a left guide-fixing plate 22 and a right guide-fixing plate 23, the hoistway-fixing base plate 21 is of a rectangular plate-like structure (e.g., a rectangular parallelepiped structure), the left guide-fixing plate 22 and the right guide-fixing plate 23 correspond to each other in the left-right direction and are fixed to the upward side of the hoistway-fixing base plate 21 in a state perpendicular to the hoistway-fixing base plate 21, a space between the left guide-fixing plate 22 and the right guide-fixing plate 23 is formed as a bracket-guiding chamber 24, and the traction machine assembly 1 corresponds to the bracket-guiding chamber 24 and is disposed on the hoistway-mounting bracket 2 in a state of being slidably fitted to the opposite side of the left guide-fixing plate 22 and the right guide-fixing plate 23.

A pair of left guide rails 221 are fixed to the left guide rail fixing plate 22 on the side facing the right guide rail fixing plate 23, that is, on the right side of the left guide rail fixing plate 22 at a spacing in the vertical direction, while a pair of right guide rails 231 are fixed to the right guide rail fixing plate 23 on the side facing the left guide rail fixing plate 22, that is, on the left side of the right guide rail fixing plate 23 at a spacing in the vertical direction at a position corresponding to the pair of left guide rails 221, and the hoisting machine assembly 1 is mounted on the hoistway mounting bracket 2 in the mounting bracket guide chamber 24 in a state of being slidably fitted to the facing sides of the pair of left guide rails 221 and the pair of right guide rails 231.

The traction machine assembly 1 comprises a traction machine 11, a traction sheave 12 and a traction machine counterweight 13, wherein the traction sheave 12 is fixed on a traction machine power output shaft 111 of the traction machine 11, a traction rope 10 is wound on the traction sheave 12, the traction machine counterweight 13 is fixed at the bottom of the traction machine 11, and the traction machine 11 and the traction machine counterweight 13 are in sliding fit with the opposite sides of the pair of left guide rails 221 and the pair of right guide rails 231 in the mounting frame guide cavity 24; a traction machine upper displacement limit position signal collector 3 and a traction machine lower displacement limit position signal collector 4 are fixed on one side of the right guide rail fixing plate 23 facing the left guide rail fixing plate 22, namely on the left side of the right guide rail fixing plate 23, the traction machine upper displacement limit position signal collector 3 corresponds to the upper part of the edge part of the traction machine 11, and the traction machine lower displacement limit position signal collector 4 corresponds to the lower part of the edge part of the traction machine 11.

The pair of left guide rails 221 each have a left guide rail fixing base plate 2211, the left guide rail fixing base plate 2211 is fixed to the left guide rail fixing plate 22 on the side (right side) facing the right guide rail fixing plate 23 by a left guide rail fixing base plate screw 22111, the pair of right guide rails 231 each have a right guide rail fixing base plate 2311, and the right guide rail fixing base plate 2311 is fixed to the right guide rail fixing plate 23 on the side (left side) facing the left guide rail fixing plate 22 by a right guide rail fixing base plate screw 23111. As shown in fig. 1 and 2, the cross-sectional shapes of the pair of left guide rails 221 and the pair of right guide rails 231 are substantially T-shaped.

A pair of left guide shoes 112 (which may be referred to as "left guide sliders" hereinafter) are fixed to the left side of the hoisting machine 11 at positions corresponding to each of the pair of left guide rails 221, respectively, and the pair of left guide shoes 112 are slidably engaged with the pair of left guide rails 221; a pair of right guide shoes 113 (which may also be referred to as "right guide sliders" hereinafter) are fixed to the right side of the hoisting machine 11 at positions corresponding to each of the pair of right guide rails 231, and the pair of right guide shoes 113 are slidably engaged with the pair of right guide rails 231.

The pair of left guide shoes 112 each have a left guide shoe cavity in which a pair of left guide shoes 1121 are fixed in a state of facing each other by a left guide shoe fixing screw 11211, the pair of left guide shoes 1121 being slidably engaged with both sides of the pair of left guide rails 221; the pair of right guide shoes 113 each have a right guide shoe cavity in which a pair of right guide bushes 1131 are fixed in a face-to-face state by a right guide bush fixing screw, and the pair of right guide bushes 1131 are slidably fitted to both sides of the pair of right guide rails 231.

In the present embodiment, since the hoisting machine upper displacement limit position signal collector 3 and the hoisting machine lower displacement limit position signal collector 4 are fixed to the right guide rail fixing plate 23 on the side facing the left guide rail fixing plate 22, that is, on the left side of the left guide rail fixing plate 22, an upper striking plate 114 is preferably fixed to the upper portion of the right side of the front end of the hoisting machine 11 by welding, the right end of the upper striking plate 114 corresponds to the lower portion of the hoisting machine upper displacement limit position signal collector 3, and a lower striking plate 115 is also preferably fixed to the lower portion of the right side of the front end of the hoisting machine 11 by welding, and the right end of the lower striking plate 115 corresponds to the upper portion of the hoisting machine lower displacement limit position signal collector 4; the aforementioned traction machine 11 has a pair of traction machine working power connection posts 116 (also referred to as "power posts").

The applicant needs to state that: the aforementioned upper-machine-displacement limit position signal collector 3 and lower-machine-displacement limit position signal collector 4 may be fixed to the side of the left rail fixing plate 22 facing the right rail fixing plate 23 (i.e., to the right side of the left rail fixing plate 22), and in this case the aforementioned upper striking plate 114 and lower striking plate 115 are respectively transferred to the upper portion and lower portion of the front-end left-side edge portion of the hoisting machine 11.

The upper displacement limit position signal collector 3 of the traction machine is fixed on an upper impact bow 31 (namely an upper fixing seat of the signal collector), the lower displacement limit position signal collector 4 of the traction machine is fixed on a lower impact bow 41 (namely a lower fixing seat of the signal collector), and the upper impact bow 31 and the lower impact bow 41 are respectively fixed on one side of the right guide rail fixing plate 23 facing the left guide rail fixing plate 22 by screws; in the present embodiment, the hoisting machine upper displacement limit position signal collector 3 and the hoisting machine lower displacement limit position signal collector 4 are position proximity switches, but a micro switch, a travel switch, a reed switch, or a hall sensor may be used.

The hoist counterweight 13 is composed of a plurality of metal plates stacked from bottom to top and is fixed to the bottom of the hoist 11 by a set of counterweight fixing bolts 131.

Fixing plate mounting bolts 211 are disposed at the left and right side edges of the hoistway fixing base plate 21; a traction machine limit stop 25 is fixed by a limit stop fixing screw 251 between the top portion corresponding to the left guide fixing plate 22 and the top portion of the right guide fixing plate 23 at a central position.

Since the tractor 11 is electrically connected to the controller through the tractor operating power connection column 11, the tractor upper displacement limit position signal collector 3 and the tractor lower displacement limit position signal collector 4 by wires, which is a known technology, the applicant does not need to describe any further.

Referring to fig. 3 in conjunction with fig. 1 and 2, in fig. 3, there is shown a car 20, a hoistway 5, and a counterweight 40 (also referred to as a "counterweight"), an upper cross beam 51 (typically a pair arranged in parallel) as mentioned in the above background art column by the applicant is provided at the top of the hoistway 5, and two upper return sheaves 30 are rotatably provided on the upper cross beam 51. The hoistway mounting bracket 2 of the present invention shown in fig. 1 and 2 is fixed to a lower portion (also referred to as "bottom") of the hoistway 5 at a central position, specifically: the hoistway fixing plate 21 is fixed to the base of the lower part of the hoistway 5 by the fixing plate mounting bolt 211. The hoisting machine assembly 1 is provided on the hoistway mounting bracket 2 in a substantially vertically floating state. One end of a hoisting rope 10 is fixed with the bottom of the car 20, the middle part is wound on the hoisting sheave 12, the other end is fixed with the lower part of the counterweight 40, one end of a car lifting traction rope 202 is fixed on the top of the car 20, the middle part of the car lifting traction rope 202 is sleeved on the upper return rope sheave 30 (a pair), and the other end is connected with the upper part of the counterweight 40. As can be seen from fig. 3, since the present invention significantly reduces the number of the up-returning sheaves 30 and significantly shortens the length of the hoist rope 10 compared to the prior art, for example, compared to the structure shown in fig. 4 and 5, the technical effects of the applicant described in the above technical effect column can be objectively and fully realized, as is apparent from the following: the specification of the hoistway 5 is reduced, the hoistway mounting bracket 2 together with the traction machine assembly 1 can be centered in the lower portion of the hoistway 5, and so on.

When the traction machine 11 is operated, the cage 20 is moved downward by the traction sheave 12 through the traction rope 10, that is, the cage 20 is moved from the upper floor to the lower floor, and in this state, the aforementioned counter weight 40 is displaced upward. Otherwise, the same example is not repeated.

In this case, since the hoist assembly 1 is slidably engaged with the pair of left guide rails 221 and the pair of right guide rails 231 through the pair of left guide shoes 112 and the pair of right guide shoes 113, respectively, the hoist assembly 1 can be floated up and down between the upper-displacement limit position signal collector 3 and the lower-displacement limit position signal collector 4 of the hoist, and the surplus of the extension of the hoist rope 10 can be solved. When the collision plate 115 of the hoisting machine 11 collides with the hoisting machine lower displacement limit position signal collector 4, the hoisting machine lower displacement limit position signal collector 4 feeds back a signal to the electric controller, and the electric controller gives an instruction to the hoisting machine 11 to stop the machine (stop the machine by cutting off the power supply). On the other hand, when the upper collision plate 114 collides with the hoisting machine upper displacement limit position signal collector 3, a signal is fed back to the electric controller, and the hoisting machine 11 is stopped (stopped by the power supply cut). In the latter case, that is, in the case where the upper striking plate 114 strikes the machine upper displacement limit position signal collector 3, mainly in the case where the car 20 or other parts encounter resistance due to an unexpected situation to displace the hoisting machine 11 upward, the aforementioned machine upper displacement limit position signal collector 3 is struck by the upper striking plate 114, and in addition, the hoisting machine limit baffle 25 shown in the drawing and mentioned above has a double protection function: firstly, even if the traction machine 11 excessively ascends, the traction machine is blocked by the traction machine limit baffle 25 to play a role in ensuring, and the left and right guide shoes 112 and 113 of the traction machine 11 cannot break loose from the sliding fit with the pair of left guide rails 221 and the pair of right guide rails 231; secondly, the connecting function between the left and right guide rail fixing plates 22 and 23 is strengthened.

In conclusion, the technical scheme provided by the invention overcomes the defects in the prior art, successfully completes the invention task and truly realizes the technical effects of the applicant in the technical effect column.