A gear and rack transmission structure for a four-way vehicle

Abstract

The utility model discloses a gear and rack drive structure for four -way car promotes relates to intelligent warehousing logistics technical field, including hoist frame, set up in hoist frame inside hoist car, drive mechanism and four racks of fixed mounting in hoist frame four upright column inboard, drive mechanism includes three -phase asynchronous motor, mechanical drive mechanism, the utility model discloses through three -phase asynchronous motor starting output power to main transmission shaft, and the main transmission shaft is stably supported by the self -aligning bearing of split type self -aligning support seat, and then power input bevel gear changes direction box, and the active bevel gear in the box is solid -connected with the main transmission shaft, and is engaged with four driven bevel gears, and synchronous distribution power to four driven transmission shafts, realizes hoist car four -corner power even synchronous transmission, replaces four servo motor's electrical synchronous mode, reduces the hardware cost.

Description

Technical Field

[0001] This utility model relates to the field of intelligent warehousing and logistics technology, specifically a gear and rack transmission structure for four-way vehicle lifting. Background Technology

[0002] Four-way shuttles are core material handling equipment in modern high-density automated warehouses, capable of traveling longitudinally and laterally along rack tracks. To enable cross-level operations, specialized floor-changing elevators are needed to transport the four-way shuttles to different floors. Currently, most such elevators on the market employ a rack and pinion drive system. Specifically, a servo motor is installed at each of the four corners of the elevator car, and each servo motor directly drives a gear, which meshes with a rack fixed to the elevator frame columns to drive the car's lifting and lowering.

[0003] The advantage of this four-motor drive mode is its high control precision. The four servo motors achieve precise synchronous operation through the controller, which can effectively ensure the levelness of the car and prevent jamming or sinking caused by asynchrony, thereby ensuring that the four-way vehicle can smoothly enter and exit the car.

[0004] However, this approach also has significant drawbacks: First, the cost of the four servo motors and their associated drivers, encoders, and control mechanisms is high; second, the electrical control mechanism is complex, requiring sophisticated algorithms and hardware for multi-motor synchronous control, which increases the difficulty of debugging and maintenance; and finally, each of the four motors requires independent wiring, making the management of the cables as they move along with the car quite cumbersome.

[0005] To address this issue, we designed a rack and pinion drive structure for four-way vehicle lifting. Utility Model Content

[0006] The purpose of this invention is to provide a gear and rack transmission structure for lifting four-way vehicles, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides a gear and rack transmission structure for four-way vehicle lifting, including a lifting frame, a lifting car disposed within the lifting frame, a drive mechanism, and four racks fixedly installed on the inner sides of the four columns of the lifting frame; the drive mechanism includes a three-phase asynchronous motor, a mechanical transmission mechanism, and four sets of corner transmission units symmetrically arranged at the four corners of the lifting car; each corner transmission unit includes a planetary reducer and gears, the gears being fixed to the output shaft end of the planetary reducer and meshing with the racks at corresponding positions; the mechanical transmission mechanism includes a drive shaft and a drive shaft support, the drive shaft being positioned and fixed on the lifting car by the drive shaft support; the output power of the three-phase asynchronous motor is transmitted sequentially through the drive shaft, a universal coupling, and a right-angle commutator to the input shaft of the planetary reducer, driving the gears to rotate along the meshing racks, thereby driving the lifting car to rise and fall synchronously.

[0008] Furthermore, the transmission shaft includes a main transmission shaft and four driven transmission shafts. One end of the main transmission shaft is connected to the output end of the three-phase asynchronous motor, and the other end is connected to a power distribution mechanism. The four output ends of the power distribution mechanism are respectively connected to the four driven transmission shafts one by one to synchronously distribute power to each corner transmission unit.

[0009] Furthermore, the power distribution mechanism is a bevel gear reversing box, which is located at the end of the main drive shaft in the middle of the hoist car; the driving bevel gear inside the bevel gear reversing box is coaxially and fixedly connected to the main drive shaft, and the four driven bevel gears are fixedly connected to one end of the four driven drive shafts in a one-to-one correspondence, and each driven bevel gear meshes with the driving bevel gear, which is used to reverse the power of the main drive shaft and synchronously distribute it to the four driven drive shafts.

[0010] Furthermore, the universal coupling is disposed between the end of the driven drive shaft and the input end of the right-angle commutator; both ends of the universal coupling are detachably fixed to the end of the driven drive shaft and the input end of the right-angle commutator respectively via flanges.

[0011] Furthermore, the right-angle commutator is located on the input side of the planetary reducer at the corner of the hoist car; the driving bevel gear inside the right-angle commutator is fixedly connected to the output end of the universal coupling, and the driven bevel gear is fixedly connected to the input shaft of the planetary reducer.

[0012] Furthermore, the planetary reducer is fixed to the outer corner of the hoist car via a mounting base with a waist-shaped adjustment hole at the bottom; the waist-shaped adjustment hole is used to adjust the installation position of the planetary reducer to adapt to the meshing clearance of the gear and rack.

[0013] Furthermore, the rack is fixed in a pre-set mounting groove on the inner side of the hoist frame column by T-bolts and anti-loosening nuts.

[0014] Furthermore, the drive shaft support is a split self-aligning support, which is spaced out at the segment positions of the drive shaft and fixedly connected to the load-bearing frame of the hoist car; the self-aligning bearing inside the drive shaft support is sleeved on the outside of the drive shaft.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. The three-phase asynchronous motor starts and outputs power to the main drive shaft. The main drive shaft is stably supported by the self-aligning bearing of the split self-aligning support seat, and then inputs the power into the bevel gear reversing box. The active bevel gear in the box is fixed to the main drive shaft. By meshing with the four driven bevel gears, the power is synchronously distributed to the four driven drive shafts, realizing the uniform and synchronous transmission of power to the four corners of the hoist car. This replaces the electrical synchronization mode of four servo motors and reduces hardware costs.

[0016] 2. The power from the driven shaft is transmitted to the right-angle commutator via a universal coupling. The internal bevel gears adjust the power direction to the vertical direction through a 90-degree meshing and then transmit the power to the planetary reducer. The planetary reducer, with its mounting base featuring a waist-shaped hole, adapts to the meshing clearance between the gear and the rack. After receiving the power, it reduces speed and increases torque to drive the gear to rotate. The gear meshes with the rack on the inner side of the hoist frame column, converting the rotational motion into linear transmission. The four corner gears mesh synchronously with the rack, driving the hoist car to move horizontally up and down, compensating for installation errors. Attached Figure Description

[0017] Figure 1 This is a front view of the overall structure of this utility model; Figure 2 This is a schematic diagram of the power transmission principle of the drive mechanism of this utility model; Figure 3 This is a schematic diagram of the installation structure of the corner transmission unit.

[0018] In the diagram: 1. Rack; 2. Hoist car; 3. Right-angle commutator; 4. Universal coupling; 5. Gear; 6. Planetary reducer; 7. Three-phase asynchronous motor; 8. Drive shaft; 9. Drive shaft support. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3This utility model provides a technical solution: a gear and rack transmission structure for four-way vehicle lifting, including a lifting frame, a lifting car 2 set in the lifting frame, a drive mechanism, and four racks 1 fixedly installed on the inner sides of the four columns of the lifting frame; the drive mechanism includes a three-phase asynchronous motor 7, a mechanical transmission mechanism, and four sets of corner transmission units symmetrically arranged at the four corners of the lifting car 2; the corner transmission unit includes a planetary reducer 6 and a gear 5, the gear 5 is fixedly mounted on the output shaft end of the planetary reducer 6 and meshes with the rack 1 at the corresponding position; the mechanical transmission mechanism includes a drive shaft 8 and a drive shaft support 9, the drive shaft 8 is positioned and fixed on the lifting car 2 through the drive shaft support 9; the output power of the three-phase asynchronous motor 7 is transmitted sequentially through the drive shaft 8, the universal coupling 4, and the right-angle commutator 3 to the input shaft of the planetary reducer 6, driving the gear 5 to mesh and rotate along the rack 1, so as to drive the lifting car 2 to rise and fall synchronously.

[0021] In specific implementation, a three-phase asynchronous motor 7 is used as the power source. Its output power is transmitted sequentially through the drive shaft 8, universal coupling 4, and right-angle commutator 3 to the planetary reducers 6 at the four corners of the hoist car 2. The drive gear 5 meshes with the rack 1 on the inner side of the hoist frame column and rotates, ultimately driving the hoist car 2 to rise and fall synchronously. This setting replaces the four servo motors of the existing technology with a single three-phase asynchronous motor 7, effectively reducing the manufacturing cost of the device.

[0022] See Figure 1-3 The drive shaft 8 includes a main drive shaft and four driven drive shafts. One end of the main drive shaft is connected to the output end of the three-phase asynchronous motor 7, and the other end is connected to a power distribution mechanism. The four output ends of the power distribution mechanism are respectively connected to the four driven drive shafts to distribute power synchronously to each corner transmission unit.

[0023] In practice, the drive shaft 8 is divided into a main drive shaft and four driven drive shafts. The main drive shaft inputs the power of the three-phase asynchronous motor 7 to the power distribution mechanism, and then the power distribution mechanism distributes the power synchronously to the four driven drive shafts to ensure that the corner transmission units at the four corners of the hoist car 2 receive power synchronously.

[0024] See Figure 1-3 The power distribution mechanism is a bevel gear reversing box, which is located at the end of the main drive shaft in the middle of the hoist car 2. Inside the bevel gear reversing box, the driving bevel gear is coaxially fixed to the main drive shaft, and the four driven bevel gears are fixed to one end of the four driven drive shafts respectively. Each driven bevel gear meshes with the driving bevel gear, which is used to reverse the power of the main drive shaft and synchronously distribute it to the four driven drive shafts.

[0025] In practice, the driving bevel gear inside the bevel gear reversing box is coaxially fixed to the main drive shaft, and the four driven bevel gears are fixed to the four driven drive shafts respectively and all mesh with the driving bevel gear; the power of the main drive shaft is transmitted synchronously to the four driven drive shafts through the meshing of the bevel gears.

[0026] See Figure 1-3 The universal coupling 4 is located between the end of the driven drive shaft and the input end of the right-angle commutator 3; the two ends of the universal coupling 4 are detachably fixed to the end of the driven drive shaft and the input end of the right-angle commutator 3 respectively through flanges.

[0027] In practice, the universal coupling 4 is located between the end of the driven drive shaft and the input end of the right-angle commutator 3, and is detachably connected by a flange, which can compensate for the installation error between the hoist car 2 and the hoist frame.

[0028] See Figure 1-3 The right-angle commutator 3 is located on the input side of the planetary reducer 6 at the corner of the hoist car 2; the driving bevel gear inside the right-angle commutator 3 is fixedly connected to the output end of the universal coupling 4, and the driven bevel gear is fixedly connected to the input shaft of the planetary reducer 6.

[0029] In specific implementation, the right-angle commutator 3 is located on the input side of the planetary reducer 6 at the corner of the hoist car 2. The internal driving bevel gear is fixedly connected to the output end of the universal coupling 4, and the driven bevel gear is fixedly connected to the input shaft of the planetary reducer 6. The power transmission direction is changed by ninety degrees through the meshing of the bevel gears.

[0030] See Figure 1-3 The planetary reducer 6 is fixed to the outer corner of the hoist car 2 via a mounting base with a waist-shaped adjustment hole at the bottom; the waist-shaped adjustment hole is used to adjust the installation position of the planetary reducer 6 to match the meshing clearance between the gear 5 and the rack 1.

[0031] In practice, the planetary reducer 6 is fixed to the outer corner of the hoist car 2 via a mounting base with an oblong adjustment hole. The position of the reducer is adjusted through the oblong hole to match the meshing clearance between the gear 5 and the rack 1.

[0032] See Figure 1-3 The rack 1 is fixed in the pre-set mounting groove on the inner side of the hoist frame column by T-bolts and anti-loosening nuts.

[0033] In practice, rack 1 is fixed in the mounting groove inside the hoist frame column by T-bolts and anti-loosening nuts to ensure the stability of rack 1 installation.

[0034] See Figure 1-3The drive shaft support seat 9 is a split self-aligning support seat, which is spaced out at the segment positions of the drive shaft 8 and is fixedly connected to the load-bearing frame of the hoist car 2; the self-aligning bearing inside the drive shaft support seat 9 is sleeved on the outside of the drive shaft 8.

[0035] In specific implementation, the drive shaft support seat 9 is a split self-aligning support seat, which is spaced out at the segment positions of the drive shaft 8 and fixedly connected to the load-bearing frame of the hoist car 2. Its internal self-aligning bearing is sleeved on the outside of the drive shaft 8 to reduce the vibration of the drive shaft 8.

[0036] Working principle: After the three-phase asynchronous motor 7 starts, it outputs power and transmits the power to the main drive shaft. The main drive shaft is stably supported by the internal self-aligning bearing of the split self-aligning support seat to avoid deflection and vibration during operation. The power is transmitted to the bevel gear reversing box in the middle of the hoist car 2. The driving bevel gear in the bevel gear reversing box is coaxially fixed to the main drive shaft. After receiving the power from the main drive shaft, it distributes the power synchronously to the four driven drive shafts through meshing with the four driven bevel gears, so that the power is evenly distributed to the four corners of the hoist car 2. The power of each driven drive shaft is transmitted to the universal coupling 4, and then the power is input to the right angle commutator 3. The internal drive bevel gear is fixed to the output end of the universal coupling 4. By meshing with the driven bevel gear at a 90-degree angle, the power transmission direction is adjusted to the vertical direction and sent to the input shaft of the planetary reducer 6. The planetary reducer 6 is fixed to the outer corner of the hoist car 2 via a mounting base with a waist-shaped adjustment hole at the bottom. After receiving power, it reduces speed and increases torque, driving the gear 5 fixed at the output shaft end to rotate. The gear 5 meshes with the rack 1 on the inner side of the hoist frame column, converting the rotational motion into linear transmission. The gears 5 at the four corners mesh and rotate synchronously with the corresponding racks 1, driving the hoist car 2 to rise and fall horizontally along the hoist frame.

Claims

1. A gear and rack transmission structure for lifting a four-way vehicle, characterized in that, It includes a hoist frame, a hoist car (2) disposed within the hoist frame, a drive mechanism, and four racks (1) fixedly installed on the inner sides of the four columns of the hoist frame. The drive mechanism includes a three-phase asynchronous motor (7), a mechanical transmission mechanism, and four sets of corner transmission units symmetrically arranged at the four corners of the hoist car (2); The corner transmission unit includes a planetary reducer (6) and a gear (5). The gear (5) is fixed to the output shaft end of the planetary reducer (6) and meshes with the rack (1) at the corresponding position. The mechanical transmission mechanism includes a transmission shaft (8) and a transmission shaft support (9). The transmission shaft (8) is positioned and fixed on the hoist car (2) by the transmission shaft support (9). The output power of the three-phase asynchronous motor (7) is transmitted sequentially through the transmission shaft (8), universal coupling (4), and right-angle commutator (3) to the input shaft of the planetary reducer (6), driving the gear (5) to mesh and rotate along the rack (1) so as to drive the hoist car (2) to rise and fall synchronously.

2. The gear and rack transmission structure for four-way vehicle lifting as described in claim 1, characterized in that: The drive shaft (8) includes a main drive shaft and four driven drive shafts. One end of the main drive shaft is connected to the output end of the three-phase asynchronous motor (7), and the other end is connected to a power distribution mechanism. The four output ends of the power distribution mechanism are respectively connected to the four driven drive shafts to distribute power synchronously to each corner transmission unit.

3. The gear and rack transmission structure for four-way vehicle lifting as described in claim 2, characterized in that: The power distribution mechanism is a bevel gear reversing box, which is located at the end of the main drive shaft in the middle of the hoist car (2); Inside the bevel gear reversing gearbox, the driving bevel gear is coaxially fixed to the main drive shaft, and the four driven bevel gears are fixed to one end of the four driven drive shafts respectively. Each driven bevel gear meshes with the driving bevel gear, which is used to reverse the power of the main drive shaft and synchronously distribute it to the four driven drive shafts.

4. The gear and rack transmission structure for four-way vehicle lifting as described in claim 2, characterized in that: The universal coupling (4) is located between the end of the driven drive shaft and the input end of the right-angle commutator (3); The universal coupling (4) is detachably fixed at both ends to the end of the driven drive shaft and the input end of the right-angle commutator (3) via flanges.

5. A gear and rack transmission structure for four-way vehicle lifting as described in claim 2, characterized in that: The right-angle commutator (3) is located on the input side of the planetary reducer (6) at the corner of the hoist car (2); The driving bevel gear inside the right-angle commutator (3) is fixedly connected to the output end of the universal coupling (4), and the driven bevel gear is fixedly connected to the input shaft of the planetary reducer (6).

6. The gear and rack transmission structure for four-way vehicle lifting as described in claim 1, characterized in that: The planetary reducer (6) is fixed to the outer corner of the hoist car (2) via a mounting base with a waist-shaped adjustment hole at the bottom; The waist-shaped adjustment hole is used to adjust the installation position of the planetary reducer (6) to match the meshing clearance between the gear (5) and the rack (1).

7. The gear and rack transmission structure for four-way vehicle lifting as described in claim 1, characterized in that: The rack (1) is fixed in the pre-set mounting groove on the inner side of the hoist frame column by T-bolts and anti-loosening nuts.

8. The gear and rack transmission structure for four-way vehicle lifting as described in claim 1, characterized in that: The drive shaft support seat (9) is a split self-aligning support seat, which is spaced out at the segment positions of the drive shaft (8) and fixedly connected to the load-bearing frame of the hoist car (2); the self-aligning bearing inside the drive shaft support seat (9) is sleeved on the outside of the drive shaft (8).

Images