Pinion and rack type tower drum elevator

Abstract

The utility model relates to a gear and rack type tower drum elevator. Comprising a lifting car structure which is meshed with a crawling ladder type rack, and further comprises a lower limiting contour device and an upper limiting contour device which are installed on the car structure. The lifting car structure comprises a lifting driving device; two groups of car side panels, a car back panel, a car front panel and a sliding door device are mounted on the lifting driving device; the lifting driving device comprises a lift car base and a lifting mounting seat which are fixedly connected, a first gear motor and a second gear motor are mounted on the lifting mounting seat, a first driving gear is in key connection with the first gear motor, and a second driving gear is in key connection with the second gear motor; a first guide wheel assembly and a second guide wheel assembly are mounted on the lifting mounting seat; a plurality of groups of weighing sensors for connecting the loading base with the car base are arranged between the loading base and the car base. The elevator is compact and reasonable in structural design, high in integration degree and large in load capacity, the load of the elevator can be detected in real time, and the overload operation phenomenon of the elevator is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of wind power equipment, especially relates to a rack and pinion type tower drum elevator. BACKGROUND

[0002] As a clean renewable energy, wind energy is more and more valued by countries all over the world and has a huge amount, and wind power generation, as one of the new energy industries today, has developed rapidly due to its environmental protection and energy saving advantages. Wind power generation refers to converting the kinetic energy of wind into electric energy. Such a wind turbine can be divided into three parts: wind wheel (including tail rudder), generator and tower drum.

[0003] The tower drum is a frame supporting the wind wheel, tail rudder and generator. It is usually built relatively high in order to obtain larger and more uniform wind power and have sufficient strength. The tower drum elevator (also known as climbing equipment) is installed inside the wind turbine tower drum to send workers or tools and materials to the upper platform or cabin and can stop at any position in the tower drum for maintenance work at any time. The lifting drive device of the traditional elevator generally uses steel wire rope to pull for lifting. In addition, in order to ensure the stability of the lifting movement of the elevator, a guide rail structure extending in the vertical direction is installed on the inner wall of the wind turbine tower drum, and the elevator moves up and down along the guide rail structure under the lifting action of the steel wire rope.

[0004] The above-mentioned traditional elevator has certain defects: first, limited by the steel wire rope lifting method, the size of the lifting car of the tower drum elevator cannot be too large, which affects the load capacity of the tower drum elevator; in addition, the traditional elevator does not have an overload detection function, and if too many goods or too many people are forced into the lifting car, there is a great safety hazard; finally, the lifting drive device of the traditional elevator has low integration level, making the assembly process of the elevator complicated, so it is urgent to design a rack and pinion type tower drum elevator to solve the above-mentioned problems. Utility model content

[0005] The utility model provides a rack and pinion type tower drum elevator with compact and reasonable structure design, high integration level, large load capacity and overload detection function to solve the technical problems in the prior art.

[0006] The utility model discloses a gear and rack type tower drum elevator which comprises a lifting car structure, the lifting car structure is engaged with the ladder rack installed on the tower drum ladder, further comprises the lower limit contour device installed at the bottom of the car structure and the upper limit contour device installed at the top of the car structure, and the lifting car structure comprises the lifting drive device engaged with the ladder rack and rolling contact with the tower drum ladder, two groups of car side panels arranged oppositely and the car back plate and car front panel arranged oppositely are installed on the lifting drive device, and the sliding door device is installed between the car front panel and the lifting drive device.

[0007] The utility model discloses a gear and rack type tower drum elevator, through setting up the lifting drive device of self-contained unit, can be convenient for staff with its base, and two car side panels, car back plate, car front panel and sliding door device are installed on the lifting drive device quickly, and then constitute the lifting car structure, realize the quick assembly operation of tower drum elevator, and the modular degree is high, the weight of the load bearing base is detected in real time, and the overload operation of tower drum elevator is avoided, the gear and rack lifting mode of lifting car structure is realized through the engagement of the ladder rack installed on the tower drum ladder and the speed reducer motor and drive gear, the structure of the lifting car structure assembled based on the lifting drive device is large, and then the load of the elevator is improved, the lifting movement stability of lifting car structure is realized through the first guide pulley assembly and the second guide pulley assembly, the compact and reasonable structure design of the utility model is integrated with high degree and large load, and the load of the elevator can be detected in real time, and the overload operation phenomenon of the elevator is avoided.

[0008] Preferably, the first guide pulley assembly comprises a first guide pulley seat fixedly connected to the lifting mounting base, and two groups of first clamping guide pulleys are installed on the first guide pulley seat and rolling contact with the tower drum ladder.

[0009] Preferably, the second guide wheel assembly comprises a second guide wheel base fixedly connected to the lifting mount, and a lateral guide wheel and two groups of second clamping guide wheels are installed on the second guide wheel base and in rolling contact with three surfaces of the tower climbing ladder respectively.

[0010] Preferably, the sliding door device comprises a fixed door plate located between the two groups of car side panels and fixedly connected to one group of car side panels, and a door upper sliding rail and a door lower sliding rail located outside the fixed door plate and distributed in an up-down manner, a first sliding door and a second sliding door are arranged between the door upper sliding rail and the door lower sliding rail, a plurality of upper roller mechanisms are installed at the top of the first sliding door and the second sliding door and pass through the door upper sliding rail and are in rolling contact with the door upper sliding rail, and a plurality of lower roller mechanisms are installed at the bottom of the first sliding door and the second sliding door and pass through the door lower sliding rail and are in rolling contact with the door lower sliding rail, and each lower roller mechanism is elastically connected to the corresponding sliding door.

[0011] Preferably, the lower roller mechanism comprises a roller frame passing through the door lower sliding rail, a pair of rollers rotatingly connected to the roller frame and in rolling contact with the top of the inner wall of the door lower sliding rail, a rod member longitudinally arranged on the roller frame and penetrating through the corresponding sliding door, a sleeve member sleeved on the rod member, and a tightening spring arranged in the sleeve member and penetrating through the rod member.

[0012] Preferably, the lower limiting contour device comprises a lower limiting base located below the car base, a lower fork-shaped telescopic mechanism connected to the car base and the lower limiting base, a plurality of supporting legs fixedly connected to the bottom of the car base, and a plurality of slots formed in the lower limiting base and through which the supporting legs pass; and the lower limiting contour device further comprises a bottom escape door pivotally connected to the lower limiting base, and a plurality of groups of door plate limiting plates fixedly connected to the bottom surface of the lower limiting base and limiting the bottom escape door.

[0013] Preferably, the upper limiting contour device comprises an upper limiting base installed on the top of the car structure, an upper limiting top base arranged above the upper limiting base, an upper fork-shaped telescopic mechanism connected to the upper limiting base and the upper limiting top base, a reset spring rod installed on the upper fork-shaped telescopic mechanism, and a reset spring installed between the reset spring rod and the upper limiting base; the upper limiting contour device further comprises a top escape door pivotally connected to the upper limiting top base, and a plurality of groups of upper door plate limiting plates fixedly connected to the top of the upper limiting top base and limiting the top escape door. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a three-dimensional structure schematic view of the utility model;

[0015] Figure 2 is a three-dimensional structure schematic view of the lifting driving device in the utility model, front view;

[0016] Figure 3 is the internal situation of the lower limit contour device and the lifting driving device in the utility model, and it is a three-dimensional structure schematic diagram;

[0017] Figure 4 is the three-dimensional structure schematic diagram of the lifting driving device in the utility model, and it is a rear view;

[0018] Figure 5 is the A area in Figure 4 enlarged schematic diagram;

[0019] Figure 6 is the B area in Figure 4 enlarged schematic diagram;

[0020] Figure 7 is the three-dimensional structure schematic diagram of the upper limit contour device in the utility model;

[0021] Figure 8 is the three-dimensional structure schematic diagram of the sliding door device in the utility model.

[0022] In the drawing: 1, ladder rack; 2, lifting driving device; 2-1, pedal escape door; 2-2, car base; 2-3, load base; 2-4, lifting mounting seat; 2-5, first speed reducer motor; 2-6, anti-falling safety part; 2-7, second speed reducer motor; 2-8, weighing sensor; 2-9, first driving gear; 2-10, first guide wheel assembly; 2-10-1, first guide wheel seat; 2-10-2, first clamping guide wheel; 2-11, second guide wheel assembly; 2-11-1, second guide wheel seat; 2-11-2, second clamping guide wheel; 2-11-3, lateral guide wheel; 2-12, second driving gear; 3, car back plate; 4, car side plate; 5, tower tube ladder; 6, upper limit contour device; 6-1, upper limit base; 6-2, upper fork telescopic mechanism; 6-3, upper door plate limiting plate; 6-4, top escape door; 6-5, upper limit top base; 6-6, reset spring rod; 7, car front plate; 8, sliding door device; 8-1, top spring; 8-2, lower roller mechanism; 8-3, door lower slide rail; 8-4, fixed door plate; 8-5, first sliding door; 8-6, door upper slide rail; 8-7, upper roller mechanism; 8-8, second sliding door; 8-9, door lock; 9, lower limit contour device; 9-1, support leg; 9-2, lower limit base; 9-3, bottom escape door; 9-4, lower door plate limiting plate; 9-5, lower fork telescopic mechanism. DETAILED DESCRIPTION

[0023] In order to further understand the invention content, characteristics and efficacy of the utility model, the following examples are described in detail as follows:

[0024] Please see Figure 1The utility model discloses a rack and pinion type tower drum elevator includes the lift car structure, and the lift car structure is engaged with the ladder rack 1 of the ladder of tower drum 5 upper installation, still includes the lower limit position contour device 9 of installation at the bottom of car structure and the upper limit position contour device 6 of installation at the top of car structure, the lift car structure includes the lift drive arrangement 2 of engagement with the ladder rack 1 and the rolling contact of tower drum ladder 5, is installed with the two groups of car side panels 4 of opposite setting and the car backboard 3 and car front panel 7 of opposite setting on the lift drive arrangement 2, is installed with the sliding door device 8 between car front panel 7 and lift drive arrangement 2. The above-mentioned two groups of car side panels 4 of opposite setting and the car backboard 3 and sliding door device 8 of opposite setting enclose the space for accommodating staff and material. The upper portion of car backboard 3 and each car side panel 4 is all fixed with the reinforcing rod. For the convenience of ventilation and heat dissipation, a plurality of ventilation holes are formed in each panel, backboard and sliding door device 8.

[0025] As Figure 2 Shown, the above-mentioned lift drive arrangement 2 includes fixed connection car base 2-2 and lift mounting base 2-4, is installed with the first reduction motor 2-5 and the second reduction motor 2-7 on lift mounting base 2-4, and the first reduction motor 2-5 and the second reduction motor 2-7 are according to up and down distribution, is keyed with the first drive gear 2-9 of engagement with the ladder rack 1 on the output shaft of first reduction motor 2-5, is keyed with the second drive gear 2-12 of engagement with the ladder rack 1 on the output shaft of second reduction motor 2-7, and lift drive arrangement 2 still includes the anti-falling safety part 2-6 of installation on lift mounting base 2-4, and the anti-falling safety part 2-6 is the gear type safety anti-falling device for elevator, is installed in the rear of lift mounting base 2-4, for when the tower drum elevator falls more than the set speed due to unexpected situation, locks the tower drum elevator on the ladder rack 1.

[0026] As Figure 4 Shown, lift drive arrangement 2 still includes the first guide wheel assembly 2-10 and the second guide wheel assembly 2-11 of installation on lift mounting base 2-4 and the rolling contact with tower drum ladder 5.

[0027] Further referring to Figure 5 The above-mentioned first guide wheel assembly 2-10 includes the first guide wheel seat 2-10-1 of solid connection on lift mounting base 2-4, is installed with two groups of first clamping guide wheels 2-10-2 on first guide wheel seat 2-10-1, and two groups of first clamping guide wheels 2-10-2 are divided and are arranged on the two sides of tower drum ladder 5 and are in rolling contact with tower drum ladder 5.

[0028] Further referring to Figure 6The second guide wheel assembly 2-11 comprises a second guide wheel seat 2-11-1 fixed on the lifting mounting base 2-4, and the lateral guide wheels 2-11-3 and the second clamping guide wheels 2-11-2 are respectively installed on the second guide wheel seat 2-11-1 and in rolling contact with three surfaces of the tower climbing ladder 5. Limiting portions are arranged on the outer peripheral walls of the second clamping guide wheels 2-11-2 and the lateral guide wheels 2-11-3 and protrude outward in the radial direction.

[0029] In the embodiment, the above-mentioned 5 is composed of a plurality of climbing ladder sections. The mounting blocks are welded and fixed on both ends of the climbing ladder sections. In the actual assembly process, the two climbing ladder sections are connected through the bolts and locking nuts arranged on the mounting blocks. The racks are installed on one outer side of each climbing ladder section.

[0030] As shown in Figure 2 and Figure 3 , the lifting driving device 2 further comprises a load bearing base 2-3. A plurality of load sensors 2-8 are arranged between the load bearing base 2-3 and the car base 2-2 to connect the two. The load bearing base 2-3 is provided with a pedal escape door 2-1. The warning element installed on the lifting mounting base 2-4 is electrically connected to the above-mentioned load sensors 2-8. The warning element can be a warning light or a buzzer.

[0031] Further referring to Figure 8 , the sliding door device 8 comprises a fixed door panel 8-4 located between the two groups of car side panels 4 and fixedly connected to one group of car side panels 4. The device further comprises an upper door sliding rail 8-6 and a lower door sliding rail 8-3 located outside the fixed door panel 8-4 and distributed in an up-down manner. The upper door sliding rail 8-6 and the lower door sliding rail 8-3 are both C-shaped in cross-section. The first sliding door 8-5 and the second sliding door 8-8 are arranged between the upper door sliding rail 8-6 and the lower door sliding rail 8-3. The second sliding door 8-8 is located outside the first sliding door 8-5.

[0032] A plurality of upper roller mechanisms 8-7 are arranged on the top of the first sliding door 8-5 and the second sliding door 8-8 and arranged in the upper door sliding rail 8-6 in rolling contact with the upper door sliding rail 8-6. A plurality of lower roller mechanisms 8-2 are arranged on the bottom of the first sliding door 8-5 and the second sliding door 8-8 and arranged in the lower door sliding rail 8-3 in rolling contact with the lower door sliding rail 8-3. Each lower roller mechanism 8-2 is elastically connected to the corresponding sliding door.

[0033] In the embodiment, the first sliding door 8-5 and the second sliding door 8-8 are both U-shaped, the first sliding door 8-5 is outwardly open, and the second sliding door 8-8 is inwardly open, so that the first sliding door 8-5 and the second sliding door 8-8 are limited by each other; the upper roller mechanism 8-7 includes a bent plate part integrally formed at the top of the corresponding sliding door, a plurality of rollers are arranged in pairs on the bent plate part, and the two rollers in each pair are distributed on the two sides of the bent part, and each roller is in rolling contact with the inner wall bottom of the door upper slide rail 8-6.

[0034] The lower roller mechanism 8-2 includes a roller frame penetrating the door lower slide rail 8-3, a pair of rollers are rotatably connected to the roller frame and in rolling contact with the top of the inner wall of the door lower slide rail 8-3, a rod member is fixedly connected to the roller frame and penetrates the corresponding sliding door, a sleeve member is sleeved on the rod member, the sleeve member is connected with the rod member through a locking nut, and a jacking spring 8-1 penetrating the rod member is arranged in the sleeve member. In addition, a door lock 8-9 is installed in the middle of the second sliding door 8-8.

[0035] As shown in Figure 3 The lower limiting contour device 9 includes a lower limiting base 9-2 located below the car base 2-2, a lower fork-shaped telescopic mechanism 9-5 connected with the car base 2-2 and the lower limiting base 9-2 is arranged between the car base 2-2 and the lower limiting base 9-2, the upper end of the lower fork-shaped telescopic mechanism 9-5 is pivotally connected with the car base 2-2 through a pin shaft, one side of the lower end of the lower fork-shaped telescopic mechanism 9-5 is pivotally connected with the lower limiting base 9-2 through a pin shaft, and the other side is pivotally connected with the lower limiting base 9-2 through an axle member slidingly penetrating a strip-shaped hole formed on the lower limiting base 9-2.

[0036] A plurality of supporting legs 9-1 are fixedly connected to the bottom of the car base 2-2, and a plurality of notches are formed on the lower limiting base 9-2 for the supporting legs 9-1 to penetrate; a bottom escape door 9-3 is pivotally connected to the lower limiting base 9-2, specifically, an escape window is formed on the lower limiting base 9-2, the bottom escape door 9-3 is located in the escape window and is connected with the lower limiting base 9-2 through a hinge, and a latch is arranged between the bottom escape door 9-3 and the lower limiting base 9-2 to lock the two. A plurality of groups of lower door plate limiting plates 9-4 are fixedly connected to the bottom surface of the lower limiting base 9-2 to limit the bottom escape door 9-3. In addition, a limiting switch (not shown) is installed on the car base 2-2 and cooperates with the lower limiting base 9-2.

[0037] As shown in Figure 7As shown, the upper limit wheel contour device 6 includes an upper limit base 6-1 installed at the top of the car structure, an upper limit top base 6-5 is arranged above the upper limit base 6-1, and an upper fork telescopic mechanism 6-2 connected with the two is arranged between the upper limit base 6-1 and the upper limit top base 6-5. The upper end of one side of the upper fork telescopic mechanism 6-2 is pivotally connected with the upper limit top base 6-5 through a pin shaft, and the upper end of the other side of the upper fork telescopic mechanism 6-2 is pivotally connected with the upper limit top base 6-5 through a pin shaft slidingly arranged in a strip-shaped hole opened in the upper limit top base 6-5. The lower end of one side of the upper fork telescopic mechanism 6-2 is pivotally connected with the upper limit base 6-1 through a pin shaft, and the lower end of the other side of the upper fork telescopic mechanism 6-2 is pivotally connected with the upper limit base 6-1 through a pin shaft slidingly arranged in a strip-shaped hole opened in the upper limit base 6-1. A reset spring rod 6-6 is installed on the upper fork telescopic mechanism 6-2, and a reset spring (not shown in the figure) is installed between the reset spring rod 6-6 and the upper limit base 6-1.

[0038] A top escape door 6-4 is pivotally connected with the upper limit top base 6-5, that is, an escape window is opened in the upper limit top base 6-5, the top escape door 6-4 is located in the escape window and is connected with the upper limit top base 6-5 through a hinge, and a latch is arranged between the top escape door 6-4 and the top escape door 6-4 to lock and connect the two. A plurality of groups of door plate limiting plates 6-3 for limiting the top escape door 6-4 are fixedly connected to the top of the upper limit top base 6-5. A limit switch (not shown in the figure) matched with the upper limit top base 6-5 is installed on the upper limit base 6-1.

[0039] Working principle:

[0040] By arranging the lifting driving device 2, the working personnel can quickly install the two car side panels 4, the car back plate 3, the car front panel 7 and the sliding door device 8 on the lifting driving device 2 as a base, thereby forming a lifting car structure and realizing the rapid assembly operation of the tower drum elevator. The lifting driving device 2 in the embodiment is self-contained and has high modularization, wherein the car base 2-2 and the lifting mounting seat 2-4 are fixedly connected to form an integrated seat of the lifting car structure, so that each speed reducer and each guide wheel assembly for driving the lifting movement of the car structure can be integrally installed on the integrated seat. In addition, in the actual working process, the load-bearing base 2-3 supports the working personnel or materials entering the car, and a plurality of weighing sensors 2-8 are arranged to detect the weight supported by the load-bearing base 2-3 in real time. When the detected weight exceeds the load of the lifting car structure, the warning element is started to warn the working personnel.

[0041] Through the setting of the speed reducer and the driving gear installed on the output shaft, the ladder rack type gear rack 1 installed on the tower drum ladder 5 can be engaged, and then drive the lifting car structure to move up and down along the ladder rack type gear rack 1. Compared with the traditional wire rope pulling lifting mode, the gear and the rack engaged lifting mode can better ensure the stability of the lifting process of the lifting car structure, and also realizes the large-scale of the lifting car structure assembled based on the lifting driving device 2, and then improves the load capacity of the lifting car structure.

Claims

1. A rack and pinion tower lift characterized by: The application relates to a tower crane, which comprises a tower drum ladder (5), a ladder rack (1) installed on the tower drum ladder (5), a lower limit contour device (9) installed at the bottom of a lifting car structure and an upper limit contour device (6) installed at the top of the lifting car structure; the lifting car structure comprises a lifting driving device (2) engaged with the ladder rack (1) and rolling contacted with the tower drum ladder (5), oppositely arranged two groups of car side panels (4) and oppositely arranged a car back plate (3) and a car front panel (7) installed on the lifting driving device (2), and a sliding door device (8) installed between the car front panel (7) and the lifting driving device (2); the lifting driving device (2) comprises a car base (2-2) and a lifting mounting base (2-4) fixedly connected, a first reduction motor (2-5) and a second reduction motor (2-7) installed on the lifting mounting base (2-4), a first driving gear (2-9) engaged with the ladder rack (1) and keyed connected to the output shaft of the first reduction motor (2-5), a second driving gear (2-12) engaged with the ladder rack (1) and keyed connected to the output shaft of the second reduction motor (2-7), and a first guide wheel assembly (2-10) and a second guide wheel assembly (2-11) rolling contacted with the tower drum ladder (5) and installed on the lifting mounting base (2-4); the lifting car structure further comprises a load bearing base (2-3), a plurality of load sensors (2-8) arranged between the load bearing base (2-3) and the car base (2-2) and connecting the two, a pedal escape door (2-1) arranged on the load bearing base (2-3), and a warning element installed on the lifting mounting base (2-4).

2. The rack and pinion tower lift of claim 1, wherein: The first guide wheel assembly (2-10) comprises a first guide wheel seat (2-10-1) fixedly connected to the lifting mounting base (2-4), and two groups of first clamping guide wheels (2-10-2) installed on the first guide wheel seat (2-10-1) and arranged on the two sides of the tower drum ladder (5) and rolling contacted with the tower drum ladder (5).

3. The rack and pinion tower lift of claim 1, wherein: The second guide wheel assembly (2-11) comprises a second guide wheel seat (2-11-1) fixedly connected to the lifting mounting base (2-4), and a lateral guide wheel (2-11-3) and two groups of second clamping guide wheels (2-11-2) installed on the second guide wheel seat (2-11-1) and rolling contacted with three sides of the tower drum ladder (5).

4. The rack and pinion tower lift of claim 1, wherein: The sliding door device (8) comprises a fixed door panel (8-4) located between the two groups of car side panels (4) and fixedly connected with one group of car side panels (4), a door upper sliding rail (8-6) and a door lower sliding rail (8-3) located outside the fixed door panel (8-4) and distributed in an up-down manner, a first sliding door (8-5) and a second sliding door (8-8) arranged between the door upper sliding rail (8-6) and the door lower sliding rail (8-3), a plurality of upper roller mechanisms (8-7) penetrating through the door upper sliding rail (8-6) and in rolling contact with the door upper sliding rail (8-6) are arranged at the top of the first sliding door (8-5) and the second sliding door (8-8), a plurality of lower roller mechanisms (8-2) penetrating through the door lower sliding rail (8-3) and in rolling contact with the door lower sliding rail (8-3) are arranged at the bottom of the first sliding door (8-5) and the second sliding door (8-8), and each lower roller mechanism (8-2) is elastically connected with the corresponding sliding door.

5. The rack and pinion tower lift of claim 4, wherein: The lower roller mechanism (8-2) comprises a roller frame penetrating through the door lower sliding rail (8-3), a pair of rollers rotatably connected to the roller frame and in rolling contact with the top of the inner wall of the door lower sliding rail (8-3), a rod member fixedly connected to the roller frame and longitudinally arranged and penetrating through the corresponding sliding door, a sleeve member sleeved on the rod member, a nut connecting the sleeve member with the rod member, and a tension spring (8-1) penetrating through the rod member and arranged in the sleeve member.

6. The rack and pinion tower lift of claim 1, wherein: The lower limiting contour device (9) comprises a lower limiting base (9-2) located below the car base (2-2), a lower fork-shaped telescopic mechanism (9-5) connected with the car base (2-2) and the lower limiting base (9-2) and arranged between the car base (2-2) and the lower limiting base (9-2), a plurality of supporting legs (9-1) fixedly connected to the bottom of the car base (2-2), and a plurality of notches formed in the lower limiting base (9-2) and through which the supporting legs (9-1) penetrate; the lower limiting contour device (9) further comprises a bottom escape door (9-3) pivotally connected to the lower limiting base (9-2), and a plurality of lower door plate limiting plates (9-4) fixedly connected to the bottom surface of the lower limiting base (9-2) and limiting the bottom escape door (9-3).

7. The rack and pinion tower lift of claim 1, wherein: The upper limiting contour device (6) comprises an upper limiting base (6-1) arranged at the top of the car structure, an upper limiting top base (6-5) arranged above the upper limiting base (6-1), an upper fork-shaped telescopic mechanism (6-2) connected with the upper limiting base (6-1) and the upper limiting top base (6-5) and arranged between the upper limiting base (6-1) and the upper limiting top base (6-5), a reset spring rod (6-6) arranged on the upper fork-shaped telescopic mechanism (6-2), and a reset spring arranged between the reset spring rod (6-6) and the upper limiting base (6-1); the upper limiting contour device (6) further comprises a top escape door (6-4) pivotally connected to the upper limiting top base (6-5), and a plurality of upper door plate limiting plates (6-3) fixedly connected to the top of the upper limiting top base (6-5) and limiting the top escape door (6-4).

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