Three-way fork bridge structure and pallet fork

Abstract

The utility model discloses a three-way fork bridge frame structure, which comprises a bridge frame body, and a lateral movement mounting part and a rotary mounting part which are arranged at the two ends of the frame body, the lateral movement transmission mechanism comprises a lateral movement driving assembly and a lateral movement guiding assembly, and the lateral movement driving assembly is installed in the lateral movement installation part, matched with the lateral movement guiding assembly and used for lateral movement of the bridge structure on the lateral movement guiding assembly in the horizontal direction; and the rotary transmission mechanism is mounted on the rotary mounting part. By means of the mode, the gear has the advantages of being good in meshing performance and large in contact ratio, the stability and lateral movement rotating position accuracy of a whole vehicle are improved, the bearing capacity of the gear is improved, and the service life of the gear is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of forklift equipment, in particular to a three-way forklift bridge structure and a fork. Background Art

[0002] In modern society, the logistics industry has developed rapidly. Forklifts are the most commonly used handling and stacking tools in the logistics industry. For the stacking of standard pallets, especially narrow aisle forklifts, namely three-way stacking forklifts. Among them, the bridge assembly is a crucial component in three-way stacking forklifts. It serves as a bridge connecting components such as the inner carriage and the fork carriage. At the same time, the bridge needs to slide on the inner carriage to achieve the side movement of the goods and the fork carriage, and also needs to achieve the rotation of the goods and the fork carriage. For the traditional bridge side movement and rotation reduction mechanisms, spur gears are often used for transmission. Although the spur gear structure is simple and the processing technology is good, the overall meshing performance is poor, the transmission is not stable, and it is easy to cause the shaking of the goods during the side movement and rotation, thus affecting the stability of the entire forklift. Especially for some AGV models with high requirements for the side movement and rotation position accuracy, spur gear transmission often fails to meet the usage requirements; in addition, the load capacity of spur gears is poor, and during the start and sudden stop of side movement and rotation when fully loaded, it will cause a large impact on the spur gears, thus damaging the gears. Summary of the Utility Model

[0003] The main technical problem to be solved by the utility model is to provide a three-way forklift bridge structure and a fork, which can have the advantages of good meshing performance and large contact ratio, improve the stability of the whole vehicle and the side movement and rotation position accuracy, improve the bearing capacity of the gears, and extend the service life of the gears.

[0004] One technical solution adopted by the utility model is: a three-way forklift bridge structure, including,

[0005] A bridge frame body, including side movement installation parts and rotation installation parts arranged at both ends of the frame body;

[0006] A side movement transmission mechanism, including a side movement drive assembly and a side movement guide assembly. The side movement drive assembly is installed in the side movement installation part and cooperates with the side movement guide assembly for the horizontal side movement of the bridge structure on the side movement guide assembly;

[0007] A rotation transmission mechanism, installed in the rotation installation part.

[0008] The side shift drive assembly includes an inverted side shift driver, a side shift helical gear set, and a side shift transmission shaft. The side shift transmission shaft is installed and rotates within the side shift installation portion. The side shift helical gear set is installed on the rotating shaft of the side shift driver and the side shift transmission shaft. The side shift helical gear set cooperates with the side shift guiding assembly, and the side shift helical gear set converts the rotational motion of the side shift driver into a linear motion on the side shift guiding assembly.

[0009] The side shift helical gear set includes a meshing side shift small helical gear and a side shift large helical gear. The side shift small helical gear is fixedly installed on the rotating shaft of the side shift driver, and the side shift large helical gear is fixedly installed on the side shift transmission shaft. The side shift small helical gear meshes with the side shift large helical gear, and the side shift large helical gear meshes with the side shift guiding assembly.

[0010] There are 2 side shift large helical gears, which are respectively installed at the upper and lower ends of the side shift transmission shaft. The side shift large helical gear at the upper end meshes with the side shift small helical gear, and the installation surfaces of the side shift small helical gear and the side shift large helical gear meshing with it are on the same horizontal plane.

[0011] The side shift guiding assembly includes 2 side shift guiding installation portions. A linear helical rack is fixedly installed on each of the 2 side shift guiding installation portions, and helical teeth cooperating with the side shift large helical gear are provided on the linear helical rack.

[0012] The rotation transmission mechanism includes a vertically installed rotation driver, a rotation helical gear set, and a rotation shaft group. The rotation driver rotates the rotation shaft group through the rotation helical gear set.

[0013] The rotation helical gear set includes a rotation small helical gear, a rotation intermediate small helical gear, a rotation intermediate large helical gear, and a rotation end large helical gear. The rotation shaft group includes an intermediate fixed shaft and a rotation shaft. The rotation shaft is installed and rotates within the rotation installation portion. The rotation small helical gear is fixedly installed on the rotating shaft of the rotation driver. The rotation intermediate small helical gear and the rotation intermediate large helical gear are installed on the intermediate fixed shaft from top to bottom. The end large helical gear is fixedly installed on the rotation shaft. The rotation small helical gear meshes with the rotation intermediate small helical gear, and the rotation intermediate large helical gear meshes with the end large helical gear.

[0014] The rotation intermediate small helical gear and the rotation intermediate large helical gear are connected by a spline, and the rotation shaft and the rotation end large helical gear are connected by a spline.

[0015] The helix angles of the helical gears of the side shift helical gear set and the rotation helical gear set are both 14°.

[0016] The normal module of the helical gears in the lateral shift helical gear set is 5; the normal module of the helical gears in the rotary helical gear set is 4.

[0017] The lateral shift driver and the rotary driver are selected from hydraulic motors or electric motors.

[0018] A fork includes the three-way fork bridge structure described above, and further includes an inner carriage and a fork body. The lateral shift mounting portion is movably connected to the inner carriage, the lateral shift guiding and mounting portion is fixedly mounted on the inner carriage, and the fork body is fixedly mounted on the rotary mounting portion.

[0019] The beneficial effects of the three-way fork bridge structure and the fork of the present utility model are as follows:

[0020] ① Good meshing performance: The contact line of the helical gear teeth is a straight line inclined to the gear axis. The teeth start and disengage from meshing gradually, so the transmission is stable and the noise is small. At the same time, this meshing method also reduces the influence of manufacturing errors on the transmission, thereby reducing the shaking of the goods during lateral shift and rotation, improving the stability of the whole vehicle, and improving the lateral shift and rotation position accuracy.

[0021] ② Large contact ratio: It can reduce the load on each pair of teeth, thereby relatively improving the load-bearing capacity of the gears, extending the service life of the gears, and making the transmission stable; it can well solve the problems encountered in the use of existing three-way forklifts. Description of the Drawings

[0022] Figure 1 is a cross-sectional view of a three-way fork bridge structure of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the lateral shift guiding assembly of a three-way fork bridge structure of the present utility model;

[0024] Figure 3 is a schematic structural diagram of a fork of the present utility model. Detailed Embodiments

[0025] To make the purpose, technical solutions and advantages of the present utility model clearer, the following will describe the detailed embodiments of the present utility model in conjunction with the drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of the present utility model shown in the drawings and described according to the drawings are only exemplary, and the present utility model is not limited to these embodiments.

[0026] Here, it should also be noted that in order to avoid obscuring the present utility model with unnecessary details, only the structures and / or processing steps closely related to the solution of the present utility model are shown in the drawings, and other details less related to the present utility model are omitted.

[0027] Also, in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] Please refer to Figures 1-3 Embodiment 1 of the present utility model;

[0029] A three-way forklift bridge structure, comprising

[0030] A bridge frame body 110, including a side shift mounting portion 111 and a rotation mounting portion 112 provided at both ends of the frame body;

[0031] A side shift transmission mechanism 120, including a side shift drive assembly and a side shift guiding assembly 121. The side shift drive assembly is installed in the side shift mounting portion 111 and cooperates with the side shift guiding assembly 121 for the horizontal side shift of the bridge structure on the side shift guiding assembly 121;

[0032] A rotation transmission mechanism 130, installed in the rotation mounting portion 112.

[0033] When the present application is specifically implemented, all the mounting surfaces and mounting holes of the bridge frame body are integrally processed after welding to ensure the mounting dimensions and tolerance requirements of each component in the rotation and side shift helical gear transmission mechanisms.

[0034] The side shift drive assembly includes an inverted side shift driver 122, a side shift helical gear set, and a side shift transmission shaft 123. The side shift transmission shaft 123 is installed in the side shift mounting portion 111 and rotates therein. The rotating shaft of the side shift driver 122 and the side shift transmission shaft 123 are installed with the side shift helical gear set. The side shift helical gear set cooperates with the side shift guiding assembly 121, and the side shift helical gear set converts the rotational motion of the side shift driver 122 into a linear motion on the side shift guiding assembly 121.

[0035] The side shift helical gear set includes a meshing side shift small helical gear 124 and a side shift large helical gear 125. The side shift small helical gear 124 is fixedly installed on the rotating shaft of the side shift driver 122, the side shift large helical gear 125 is fixedly installed on the side shift transmission shaft 123, the side shift small helical gear 124 meshes with the side shift large helical gear 125, and the side shift large helical gear 125 meshes with the side shift guiding assembly 121.

[0036] There are 2 side shift large helical gears 125, which are respectively installed at the upper and lower ends of the side shift transmission shaft 123. The side shift large helical gear 125 at the upper end meshes with the side shift small helical gear 124, and the mounting surfaces of the side shift small helical gear 124 and the side shift large helical gear 125 meshing with it are on the same horizontal plane. In specific implementation, the two side shift large helical gears are fixedly connected to the side shift transmission shaft with extremely high positional accuracy, thereby ensuring the synchronization during the rotation of the two side shift large helical gears, and the upper and lower side shift large helical gears can bear the torque from the goods.

[0037] The side shift guiding assembly 121 includes 2 side shift guiding mounting parts 1211. A straight rack 1212 is respectively and fixedly installed on the 2 side shift guiding mounting parts 1211, and an inclined tooth cooperating with the side shift large helical gear 125 is arranged on the straight rack 1212.

[0038] The rotary transmission mechanism 130 includes a vertically installed rotary driver 131, a rotary helical gear set and a rotary shaft set. The rotary driver 131 makes the rotary shaft set rotate through the rotary helical gear set.

[0039] The rotary helical gear set includes a rotary small helical gear 132, a rotary intermediate small helical gear 133, a rotary intermediate large helical gear 134 and a rotary end large helical gear 135. The rotary shaft set includes an intermediate fixed shaft 136 and a rotary shaft 137. The rotary shaft 137 is installed in the rotary mounting part and rotates therein. The rotary small helical gear is fixedly installed on the rotary shaft of the rotary driver. The rotary intermediate small helical gear and the rotary intermediate large helical gear are installed on the intermediate fixed shaft from top to bottom. The end large helical gear is fixedly installed on the rotary shaft. The rotary small helical gear meshes with the rotary intermediate small helical gear, and the rotary intermediate large helical gear meshes with the end large helical gear.

[0040] The rotary intermediate small helical gear 133 and the rotary intermediate large helical gear 134 are connected by splines, and the rotary shaft 137 and the rotary end large helical gear 135 are connected by splines.

[0041] In the rotary helical gear set of the present application, the rotary intermediate small helical gear and the rotary intermediate large helical gear are connected by splines to ensure their synchronous rotation, solving the problem that the two helical gears cannot be made into one body due to the too small axial distance. The rotary end large helical gear is fixedly connected to the rotary shaft to ensure their synchronous rotation.

[0042] The helix angles of the helical gears of the side shift helical gear set and the rotary helical gear set are both 14°. It has good transmission smoothness, strong load capacity, small axial force and good machining process performance.

[0043] The normal module of the helical gears in the lateral shift helical gear set is 5; the normal module of the helical gears in the rotary helical gear set is 4. This enables the helical gears of the entire transmission mechanism to have extremely high strength, extremely high load capacity, and impact resistance.

[0044] The lateral shift driver 122 and the rotary driver 131 are selected from hydraulic motors or electric motors. The lateral shift transmission mechanism and the rotary transmission mechanism of this application are respectively controlled by the rotational speeds of the lateral shift driver and the rotary driver.

[0045] A fork includes the three-way fork bridge structure 100 described above, and further includes an inner carriage 200 and a fork body 300. The lateral shift mounting portion is movably connected to the inner carriage 210. The lateral shift guiding and mounting portion 121 is fixedly mounted on the inner carriage 210, and the fork body 300 is fixedly mounted on the rotary mounting portion 112.

[0046] In the specific implementation of this application, the lateral shift guiding and mounting portion protrudes from the upper and lower end faces of the inner carriage, so that the lateral shift guiding and mounting portion forms an outwardly protruding guiding strip. The lateral shift mounting portion is provided with a guide wheel set corresponding to the guiding strip, and the guiding strip is embedded in the guide wheel set. The fork body 300 is fixedly connected to the rotary shaft. The rotary driver drives the rotary shaft to rotate through the rotary helical gear set, so that the fork body rotates around the rotary shaft.

[0047] In addition, it should be noted that in this specification, "including", "comprising", or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article, or device including the element.

[0048] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A three-way fork bridge structure, characterized in that including, a bridge frame body, including a lateral movement installation part and a rotation installation part arranged at both ends of the frame body; a lateral movement transmission mechanism, including a lateral movement drive assembly and a lateral movement guide assembly, the lateral movement drive assembly is installed in the lateral movement installation part and cooperates with the lateral movement guide assembly for the horizontal lateral movement of the bridge structure on the lateral movement guide assembly; a rotation transmission mechanism, installed in the rotation installation part.

2. The three-way fork bridge structure according to claim 1, characterized in that, The lateral movement drive assembly includes an inverted lateral movement driver, a lateral movement helical gear set and a lateral movement transmission shaft, the lateral movement transmission shaft is installed in the lateral movement installation part and rotates therein, the lateral movement helical gear set is installed on the rotating shaft of the lateral movement driver and the lateral movement transmission shaft, the lateral movement helical gear set cooperates with the lateral movement guide assembly, and the lateral movement helical gear set changes the rotational movement of the lateral movement driver into a linear movement on the lateral movement guide assembly.

3. The three-way fork bridge structure according to claim 2, characterized in that, The lateral movement helical gear set includes a meshing lateral movement small helical gear and a lateral movement large helical gear, the lateral movement small helical gear is fixedly installed on the rotating shaft of the lateral movement driver, the lateral movement large helical gear is fixedly installed on the lateral movement transmission shaft, the lateral movement small helical gear meshes with the lateral movement large helical gear, and the lateral movement large helical gear meshes with the lateral movement guide assembly.

4. A three-way fork bridge structure according to claim 3, characterized in that, There are 2 lateral movement large helical gears, which are respectively installed at the upper and lower ends of the lateral movement transmission shaft. The lateral movement large helical gear at the upper end meshes with the lateral movement small helical gear, and the installation surfaces of the lateral movement small helical gear and the lateral movement large helical gear meshing with it are on the same horizontal plane.

5. A three-way fork bridge structure according to claim 4, characterized in that, The lateral movement guide assembly includes 2 lateral movement guide installation parts, and a linear helical rack is fixedly installed on each of the 2 lateral movement guide installation parts, and helical teeth matching with the lateral movement large helical gear are arranged on the linear helical rack.

6. The three-way fork bridge structure according to claim 1, characterized in that, The rotation transmission mechanism includes a vertically installed rotation driver, a rotation helical gear set and a rotation shaft group, and the rotation driver rotates the rotation shaft group through the rotation helical gear set.

7. A three-way fork bridge structure according to claim 6, characterized in that, The rotation helical gear set includes a rotation small helical gear, a rotation intermediate small helical gear, a rotation intermediate large helical gear and a rotation end large helical gear, the rotation shaft group includes an intermediate fixed shaft and a rotation shaft, the rotation shaft is installed in the rotation installation part and rotates, the rotation small helical gear is fixedly installed on the rotating shaft of the rotation driver, the rotation intermediate small helical gear and the rotation intermediate large helical gear are installed on the intermediate fixed shaft from top to bottom, the end large helical gear is fixedly installed on the rotation shaft, the rotation small helical gear meshes with the rotation intermediate small helical gear, and the rotation intermediate large helical gear meshes with the end large helical gear.

8. A three-way fork bridge structure according to claim 7, characterized in that, The rotation intermediate small helical gear and the rotation intermediate large helical gear are connected by splines, and the rotation shaft and the rotation end large helical gear are connected by splines.

9. A three-way fork bridge structure according to any one of claims 2 or 6, characterized in that The helix angles of the helical gears of the lateral movement helical gear set and the rotation helical gear set are both 14°.

10. A three-way fork bridge structure according to any one of claims 2 or 6, characterized in that, The normal module of the helical gears of the lateral movement helical gear set is 5; the normal module of the helical gears of the rotation helical gear set is 4.

11. A three-way fork bridge structure according to any one of claims 2 or 6, characterized in that, The lateral movement driver and the rotation driver are selected from hydraulic motors or motors.

12. A forklift fork, characterized in that, Comprising the three-way forklift bridge structure according to any one of the above-mentioned claims 1-11, further comprising an inner carriage and a fork body, wherein the side-shift mounting portion is movably connected to the inner carriage, the side-shift guiding and mounting portion is fixedly mounted on the inner carriage, and the fork body is fixedly mounted on the rotary mounting portion.

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