Lightweight helical-tooth double-tooth-difference transmission rapid telescopic pallet fork device

Abstract

The invention discloses a lightweight helical-tooth double-tooth-difference transmission rapid telescopic pallet fork device, and belongs to the technical field of intelligent logistics equipment. A rolling bevel gear of the light-weight middle fork is synchronously meshed with a left helical rack and a right helical rack of the bottom fork and a left helical rack and a right helical rack of the light-weight front fork at the same time to form helical-tooth double-tooth-difference transmission, the light-weight front fork and the light-weight middle fork are driven to stretch out and draw back stably at high speed and high acceleration at double differential speed, and shifting rod mechanisms driven by motors are arranged at the two ends of the light-weight front fork. A synchronous belt rack of the driving assembly is meshed with a transmission rack at the bottom of the light-weight middle fork to drive the light-weight middle fork to move, and power is provided for the light-weight helical-tooth double-tooth-difference rapid telescopic pallet fork device. The telescopic movement of the light-weight middle fork and the light-weight front fork and the goods storing and taking process are achieved in a rolling guide rail and double-tooth-difference transmission mode. The device has the characteristics of simple structure, high-speed and high-acceleration response, small start-stop impact, light weight, stability, reliability, high use flexibility and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent logistics equipment, and in particular to a lightweight helical double-tooth difference transmission fast telescopic fork device. Background Art

[0002] As commodities are increasingly characterized by large batches, large sizes and specifications, and short delivery times, a faster and more efficient intelligent material picking process is particularly important. Therefore, higher requirements are also placed on the performance of the shuttle telescopic fork in terms of high-speed and high-acceleration response, start-stop buffering, and stable and reliable operation. The transmission performance of the telescopic fork of the multi-layer shuttle is the key to ensuring the rapid response and stable and reliable operation of the shuttle. The strength, stiffness and dynamic characteristics of the telescopic fork have a vital impact on improving the safety performance and service life of the vehicle, and the design selection and transmission characteristics of the power transmission device determine the transmission performance of the telescopic fork device. At present, the design and development of telescopic forks and their transmission systems are mostly concentrated in the functional design stage and path optimization of logistics equipment. It is urgent to solve the problems of high-speed and high-acceleration, start-stop buffering, and stable operation of the transmission system research and development and fork lightweight design, so as to provide high-performance fast telescopic fork devices and fast shuttle equipment for intelligent logistics.

[0003] At present, the existing telescopic forks in China are more inclined to functional design, and mostly use 45 steel profiles, which are heavy in mass. During the rapid telescopic operation, they will produce large inertia, which will have a certain impact on the positioning accuracy during the high-speed and high-acceleration operation of the telescopic fork, which will also affect the serial picking of goods, and is prone to impact, affecting the service life of the telescopic fork. Therefore, under the premise of ensuring strength and rigidity, the lightweight design of the telescopic fork has become a trend in the development of forks.

[0004] At present, the transmission mode of domestic telescopic forks mostly adopts belt drive with gear rack drive or chain and sprocket drive. The fork body is thick and bulky, which is easy to produce impact during its transmission, affecting its positioning accuracy and service life. In addition, due to the influence of its volume and weight, the transmission speed of the fork will be greatly reduced, and can only reach a transmission speed of low speed and low acceleration or medium speed and medium acceleration. Therefore, designing a small, flexible and lightweight high-speed and high-acceleration telescopic fork device has become the current development goal. Summary of the invention

[0005] In view of the problems mentioned in the background technology, the purpose of the present invention is to provide a lightweight helical double-tooth difference transmission fast telescopic fork device to solve the problems mentioned in the background technology.

[0006] The technical solution adopted by the present invention is: a lightweight helical double-tooth difference transmission fast telescopic fork device, including a driving component and a telescopic component, the telescopic components are symmetrically installed on the left and right sides above the driving component, the telescopic component includes a bottom fork 1, a lightweight middle fork 2, and a lightweight front fork 3, the bottom fork 1 is fixed to the frame and does not move, one side of the lightweight middle fork 2 is slidably connected to the bottom fork 1, and the other side is slidably connected to the lightweight front fork 3, the lightweight middle fork 2 is provided with a rolling helical gear 9, the bottom fork 1 and the lightweight front fork 3 are symmetrically provided with a left helical rack 10 and a right helical rack 8, the left helical rack 10 and the right helical rack 8 are synchronously meshed with the two sides of the rolling helical gear 9, the two ends of the lightweight front fork 3 are rotatably connected with a lever mechanism 4, the lever mechanism 4 is connected to a motor 11, and a transmission rack is provided at the bottom of the lightweight middle fork 2, and the transmission rack is meshed with the rack on the bottom driving component.

[0007] Specifically, the driving assembly includes a driving wheel 6, a driving shaft 5 and a synchronous belt rack 7. The front and rear driving wheels 6 are connected by the synchronous belt rack 7, and the left and right driving wheels 6 are connected by the driving shaft 5. The synchronous belt rack 7 is engaged with the transmission rack at the bottom of the lightweight middle fork 2.

[0008] Specifically, the lightweight middle fork 2 is centrally provided with an axle, and the rolling bevel gear 9 is arranged on the axle. The axis of the axle is parallel to the left bevel rack 10 and the right bevel rack 8, and the rotation plane of the rolling bevel gear 9 is parallel to the rotation plane of the left bevel rack 10 and the right bevel rack 8.

[0009] Preferably, the left side of the lightweight front fork 3 and the left side of the lightweight middle fork 2 are both provided with a horizontal rolling guide rail 12, and the right side of the bottom fork 1 and the right side of the lightweight middle fork 2 are both provided with a slide groove corresponding to the rolling guide rail 12.

[0010] Preferably, the lightweight front fork 3 and the lightweight middle fork 2 are both integrally formed of a reinforced composite cross-section aluminum alloy material.

[0011] Preferably, the reinforced composite cross-section of the lightweight middle fork 2 is in the form of a corrugated cross-section, an I-shaped cross-section, or a square cross-section, and the reinforced composite cross-section of the lightweight front fork 3 is in the form of a corrugated cross-section, an I-shaped cross-section, or a square cross-section.

[0012] Preferably, the motor 11 is mounted on the inner side of the lightweight front fork 3 by bolts.

[0013] Preferably, the front and rear ends of the lightweight front fork 3 are provided with lever fixing plates with holes, one end of the lever mechanism 4 passes through the hole on the lever fixing plate and is fixed by bolts, and the lever mechanism 4 is rotatable relative to the lightweight front fork 3.

[0014] The beneficial effects of the present invention are: 1. The telescopic assembly of the present invention adopts a helical double-tooth difference transmission mode, which drives the lightweight front fork and the lightweight middle fork to telescope rapidly and stably at high speed and high acceleration at twice the differential speed, and the rolling helical gear rack meshing transmission can offset the axial force generated by its transmission, effectively reducing the impact of the gear rack meshing, increasing the service life of the rolling guide rail, ensuring the stability of the transmission, and improving the transmission accuracy and efficiency, so that the telescopic device has the characteristics of high speed and high acceleration, and realizes a high-speed and efficient logistics selection process.

[0015] 2. The lightweight front fork and lightweight middle fork of the telescopic assembly are made of aluminum alloy, and the cross-section design of the lightweight front fork and lightweight middle fork is carried out in the form of reinforced composite cross-section. This can further reduce the dead weight without changing the original structural parameters. The static strength and static stiffness of the telescopic fork and lever under the lightweight reinforced structure meet the actual requirements of the working condition.

[0016] 3. The forks are connected and driven by rolling guide rails, which have the characteristics of small friction resistance, high positioning accuracy and high sensitivity, further improving the operating accuracy and service life of the telescopic components and reducing the vibration noise of the overall operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the telescopic assembly of the present invention; Figure 3 is a side view of the telescopic assembly of the present invention; Figure 4 It is a schematic diagram of the reinforced cross section of the front fork of the present invention; Figure 5 It is a schematic diagram of the middle fork reinforcement cross section of the present invention; Figure 6 It is a partial schematic diagram of the position of the helical gear rack of the present invention; Figure 7 It is a schematic diagram of the helical rack and pinion transmission system of the present invention; Figure 8 It is a schematic diagram of the transmission structure of the synchronous belt rack and the transmission rack of the present invention.

[0018] The numbers in the figure are: 1-bottom fork, 2-lightweight middle fork, 3-lightweight front fork, 4-lever mechanism, 5-drive shaft, 6-drive wheel, 7-synchronous belt rack, 8-right helical rack, 9-rolling helical gear, 10-left helical rack, 11-motor, 12-rolling guide. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. These descriptions are only exemplary and are intended to be used to explain the present invention, but are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0020] Example 1: Figure 1-8 As shown, a lightweight helical double-tooth difference transmission fast telescopic fork device includes a driving assembly and a telescopic assembly. The telescopic assemblies are symmetrically installed on the left and right sides above the driving assembly. The telescopic assembly includes a bottom fork 1, a lightweight middle fork 2, and a lightweight front fork 3. The bottom fork 1 is a fixed fork, which is fixed to the frame by bolts and does not move. One side of the lightweight middle fork 2 is slidably connected to the bottom fork 1, and the other side is slidably connected to the lightweight front fork 3. The lightweight middle fork 2 is provided with a rolling helical gear 9. The bottom fork 1 and the lightweight front fork 3 are symmetrically provided with a left helical rack 10 and a right helical rack 8, respectively. The left helical rack 10 and the right helical rack 8 are synchronously meshed on both sides of the rolling helical gear 9, forming a helical double-tooth difference transmission to drive the lightweight front fork 3 and the lightweight middle fork 2 to stably telescope at high speed and high acceleration. The two ends of the lightweight front fork 3 are rotatably connected with a lever mechanism 4, and the lever mechanism 4 is connected to a motor 11. A transmission rack is provided at the bottom of the lightweight middle fork 2, and the transmission rack is meshed with the rack on the bottom driving assembly.

[0021] The bottom fork 1 and the lightweight front fork 3 are substantially the same in shape and size, the left bevel rack 10 and the right bevel rack 8 are substantially the same in shape and size, and the left bevel rack 10 and the right bevel rack 8 are symmetrically arranged with the axis of the rolling bevel gear 9 as the center.

[0022] Furthermore, the driving assembly includes a driving wheel 6, a driving shaft 5 and a synchronous belt rack 7. The front and rear driving wheels 6 are connected by the synchronous belt rack 7, and the left and right driving wheels 6 are connected by the driving shaft 5. The synchronous belt rack 7 is meshed with the transmission rack at the bottom of the lightweight middle fork 2. The driving wheel 6 rotates to drive the synchronous belt rack 7, and the synchronous belt rack 7 is meshed with the transmission rack at the bottom of the lightweight middle fork 2 to drive the lightweight middle fork 2 to move telescopically. The driving assembly provides power for the entire device to achieve smooth and fast movement of the lightweight front fork 3 and the lightweight middle fork 2, thereby improving efficiency. The driving wheel 6 is connected to the driving shaft 5, so that the driving wheels 6 on both sides are evenly stressed, and the uniform and synchronous transmission of the synchronous belt rack 7 is achieved.

[0023] Furthermore, the lightweight middle fork 2 is centrally provided with an axle, a rolling bevel gear 9 is provided on the axle, the axis of the axle is parallel to the left bevel rack 10 and the right bevel rack 8, and the rotation plane of the rolling bevel gear 9 is parallel to the rotation planes of the left bevel rack 10 and the right bevel rack 8.

[0024] Furthermore, if Figure 3 , 4As shown in Figures 5 and 6, a horizontal rolling guide 12 is provided on the left side of the lightweight front fork 3, a slide groove corresponding to the rolling guide 12 on the lightweight front fork 3 is provided on the right side of the lightweight middle fork 2, a horizontal rolling guide 12 is provided on the left side of the lightweight middle fork 2, and a slide groove corresponding to the rolling guide 12 on the lightweight middle fork 2 is provided on the right side of the bottom fork 1. The rolling guide 12 and the corresponding slide groove enable the lightweight front fork 3 and the lightweight middle fork 2 to freely extend and retract in the horizontal direction.

[0025] Furthermore, the lightweight front fork 3 and the lightweight middle fork 2 are both integrally formed of a reinforced composite cross-section aluminum alloy material, thereby achieving a lightweight design of the telescopic component.

[0026] Furthermore, the reinforced composite cross-section of the lightweight middle fork 2 is in the form of a corrugated cross-section, an I-shaped cross-section, or a square cross-section, etc., and the reinforced composite cross-section of the lightweight front fork 3 is in the form of a corrugated cross-section, an I-shaped cross-section, or a square cross-section, etc. In this embodiment, the reinforced composite cross-sections of the lightweight middle fork 2 and the lightweight front fork 3 are in the form of corrugated cross-sections to achieve their lightweight.

[0027] Furthermore, the motor 11 is mounted on the inner side of the lightweight front fork 3 by bolts.

[0028] Furthermore, the front and rear ends of the lightweight front fork 3 are provided with lever fixing plates with holes, one end of the lever mechanism 4 passes through the hole on the lever fixing plate and is fixed by bolts, the bolt fixing limits the axial movement of the lever mechanism 4, and the lever mechanism 4 can rotate relative to the lightweight front fork 3. The driving assembly provides power for the lightweight helical double-tooth differential transmission fast telescopic fork device.

[0029] The working principle of the present invention is: when it is necessary to pick up goods, the driving shaft 5 drives the driving wheel 6 to make a rotary motion. Under the drive of the driving wheel 6, the synchronous belt rack 7 is meshed with the transmission rack at the bottom of the lightweight middle fork 2, thereby driving the lightweight middle fork 2 to perform a linear motion to achieve its extension and retraction. When the lightweight middle fork 2 is extended, the rolling bevel gear 9 arranged on the middle wheel axle of the lightweight middle fork 2 is meshed with the left bevel rack 10 and the right bevel rack 8. At this time, the lightweight front fork 3 moves in the same direction at twice the differential speed under the action of the meshing of the rolling bevel gear 9 with the left bevel rack 10 and the right bevel rack 8, thereby achieving the purpose of doubling the stroke of the lightweight front fork body 3 compared to the lightweight middle fork 2. The extension distance of the multi-stage fork is controlled according to the length of the goods to ensure the smooth hooking of the goods.

[0030] When the multi-stage fork is extended to the target position, the motor 11 drives the lever 4 to rotate from the raised state to the horizontal state perpendicular to the side of the front fork 3. At this time, the lever mechanism 4 rotates 90° clockwise, and the inner side of the lever mechanism 4 turned to the horizontal state is attached to the front end surface of the cargo, realizing the longitudinal fixation of the cargo. The lightweight front fork 3 retracts, the driving wheel 5 rotates in the opposite direction, and the driving rack 7 drives the lightweight middle fork 2 to retract in a straight line. The rolling bevel gear 9 provided on the middle axle of the lightweight middle fork 2 rolls relative to the left bevel rack 10 and the right bevel rack 8. At this time, the lightweight front fork 3 moves in the same direction at twice the differential speed under the meshing action of the rolling bevel gear 9 and the left bevel rack 10 and the right bevel rack 8, realizing the rapid contraction of the lightweight front fork body 3. In this way, the cargo is hooked to the vehicle body and placed on the cargo platform in the middle of the vehicle body, completing the cargo picking process.

[0031] The present invention provides an embodiment of the working principle and working process of a multi-stage double-tooth difference transmission fast telescopic fork device and a fork mechanism. During the actual implementation process, there is a vehicle body cargo platform between the telescopic component and the drive component, and the telescopic component and the drive component are symmetrically distributed on both sides of the vehicle body cargo platform, which will not be described in detail here.

[0032] It should be noted that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A lightweight helical double-tooth differential transmission rapid telescopic fork device, characterized by: The invention comprises a driving component and a telescopic component. The telescopic components are symmetrically installed on the left and right sides above the driving component. The telescopic component comprises a bottom fork (1), a lightweight middle fork (2), and a lightweight front fork (3). The bottom fork (1) is fixed. One side of the lightweight middle fork (2) is slidably connected to the bottom fork (1), and the other side is slidably connected to the lightweight front fork (3). The lightweight middle fork (2) is provided with a rolling bevel gear (9). The bottom fork (1) and the lightweight front fork (3) are symmetrically provided with a left bevel rack (10) and a right bevel rack (8). The left bevel rack (10) and the right bevel rack (8) are synchronously meshed with the two sides of the rolling bevel gear (9). The two ends of the lightweight front fork (3) are rotatably connected to a lever mechanism (4). The lever mechanism (4) is connected to a motor (11). A transmission rack is provided at the bottom of the lightweight middle fork (2). The transmission rack is meshed with a rack on the bottom driving component.

2. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 1, characterized in that: The driving assembly comprises a driving wheel (6), a driving shaft (5) and a synchronous belt rack (7). The front and rear driving wheels (6) are connected via the synchronous belt rack (7), and the left and right driving wheels (6) are connected via the driving shaft (5). The synchronous belt rack (7) is engaged with a transmission rack at the bottom of the lightweight middle fork (2).

3. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 1, characterized in that: The lightweight middle fork (2) is centrally provided with a wheel axle, a rolling helical gear (9) is provided on the wheel axle, the axis of the wheel axle is parallel to the left helical rack (10) and the right helical rack (8), and the rotation plane of the rolling helical gear (9) is parallel to the rotation planes of the left helical rack (10) and the right helical rack (8).

4. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 1, characterized in that: The left side of the lightweight front fork (3) and the left side of the lightweight middle fork (2) are both provided with a horizontal rolling guide rail (12), and the right side of the bottom fork (1) and the right side of the lightweight middle fork (2) are both provided with a sliding groove corresponding to the rolling guide rail (12).

5. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 1, characterized in that: The lightweight front fork (3) and the lightweight middle fork (2) are both integrally formed of a reinforced composite cross-section aluminum alloy material.

6. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 5, characterized in that: The reinforced composite cross-section of the lightweight middle fork (2) is in the form of a corrugated cross-section, an I-shaped cross-section, or a square cross-section, and the reinforced composite cross-section of the lightweight front fork (3) is in the form of a corrugated cross-section, an I-shaped cross-section, or a square cross-section.

7. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 1, characterized in that: The motor (11) is mounted on the inner side of the lightweight front fork (3) via bolts.

8. The lightweight helical double-tooth-difference transmission rapid telescopic fork device according to claim 1, characterized in that: The front and rear ends of the lightweight front fork (3) are provided with lever fixing plates with holes. One end of the lever mechanism (4) passes through the hole in the lever fixing plate and is fixed by a bolt. The lever mechanism (4) is rotatable relative to the lightweight front fork (3).

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