CN220723493U

CN220723493U - Bidirectional amplitude-variable heavy-load fork comprising screw rod

Info

Publication number: CN220723493U
Application number: CN202321766099.7U
Authority: CN
Inventors: 赵耀武
Original assignee: Nanjing Huaruide Logistics Equipment Co ltd
Current assignee: Nanjing Huaruide Logistics Equipment Co ltd
Priority date: 2023-07-06
Filing date: 2023-07-06
Publication date: 2024-04-05
Anticipated expiration: 2033-07-06

Abstract

The utility model discloses a bidirectional amplitude variation heavy-load fork comprising a screw rod, which comprises an amplitude variation driving assembly, a bidirectional rotation screw rod assembly in transmission connection with the amplitude variation driving assembly and a fork assembly in transmission connection with the bidirectional rotation screw rod assembly; the bidirectional rotary screw rod assembly comprises a left-handed screw rod with left-handed threads, a right-handed screw rod with right-handed threads, a left-handed nut in matched connection with the left-handed screw rod and a right-handed nut in matched connection with the right-handed screw rod, wherein the outer end of the left-handed screw rod or the outer end of the right-handed screw rod is in transmission connection with the variable amplitude driving motor; the fork assembly comprises a first telescopic fork and a second telescopic fork, the first telescopic fork is positioned on the left-handed nut, and the second telescopic fork is positioned on the right-handed nut; the bidirectional amplitude-variable heavy-load fork is good in stability and applicability.

Description

Bidirectional amplitude-variable heavy-load fork comprising screw rod

Technical Field

The utility model belongs to the technical field of intelligent warehouse logistics technology research, and particularly relates to a bidirectional amplitude-variable heavy-load fork comprising a screw rod.

Background

The storage is an important component of modern logistics, plays a vital role in a logistics system, ensures smooth production by efficient and reasonable storage, and can realize effective control and management of resources. In recent years, the intelligent warehouse has greatly improved warehouse efficiency through various high and new technologies, and flexible transmission equipment is one of the trends of realizing logistics and warehouse automation. When goods are stored and taken out in the intelligent warehouse, the goods or the trolley are generally subjected to layer-changing operation in a conveyor mode, and the conveyor is arranged on the lifting machine cargo table equipment. The pallet is taken out by the telescopic pallet, and the storage and taking operation is finished by the omnidirectional vehicle, such as delivering the goods to a designated position on a goods shelf through the pallet, or taking the goods by extending the pallet below the goods, during which the width of the pallet is required to be adapted to the width of the goods.

At present, in order to accommodate the storage and taking of cargoes with different width sizes when changing layers, at least 4 or more conveyors or a plurality of forks are needed for completing the layer changing of cargoes with different width sizes in a warehouse, a large amount of personnel investment in the early stage can be caused, a large amount of energy is consumed in the later maintenance, and the equipment failure rate can be increased; meanwhile, when transporting heavy goods, the load centers of the heavy goods with different width sizes are not in the same position, for example, when the pallet is forked and the omni-directional vehicle is forked, overturning is likely to occur in the process of forking the pallet or the omni-directional vehicle, so that the goods are transported unstably, and the applicability is required to be improved.

To above-mentioned condition, the patent of current application number CN202022111994.8 has proposed a bidirectional adjustment fork, and this bidirectional adjustment fork is through setting up, with two forks respectively with the left and right sides screw thread complex of bi-directional screw, makes two forks be close to each other or keep away from each other through the rotation of rotating bi-directional screw to this width of adjusting the fork for bidirectional adjustment fork is applicable to the goods of different width, convenient to use. But the bidirectional adjustment fork that this patent provided can not accurately adjust to goods adaptation size for the fork appears transporting the problem such as toppling when transporting the goods.

The prior patent with the application number of CN202220352006.5 proposes a bidirectional telescopic pallet fork, and the bidirectional telescopic pallet fork can drive two pallet forks to be close to or far away from each other by controlling a first driving mechanism, so that the distance between the two pallet forks is changed, and the bidirectional telescopic pallet fork is suitable for transporting cargos with different sizes; simultaneously fixed mounting clamping mechanism on fork length direction's lateral wall, clamping mechanism can be along with fork synchronous motion, and when the fork was at the material loading, clamping mechanism's loose end can shift down, and after the material loading was accomplished, clamping mechanism's loose end can shift up to this presss from both sides tightly the location to the not unidimensional material, satisfies the transportation demand of unidimensional material, possesses more extensive suitability. Although the patent realizes clamping and positioning of cargoes of different sizes through the movable end of the clamping mechanism, the load center suitable for cargoes of different sizes cannot be accurately adjusted, so that the problem of unstable transportation and the like easily occurs when the cargoes are transported.

In view of the foregoing, there is a need for a bidirectional luffing heavy load pallet fork that includes a lead screw.

Disclosure of Invention

The utility model aims to: in order to overcome the defects that in the prior art, when a warehouse is changed in layers to store and fetch goods with different width sizes, the stability is poor, the accuracy is low, and the applicability and the expandability are not realized, the utility model provides the bidirectional amplitude-variable heavy-load fork comprising the screw rod, which can realize that single equipment can take goods with different sizes into consideration, and has high stability, and meanwhile, the applicability and the expandability are good.

The technical scheme is as follows: in order to solve the technical problems, the bidirectional amplitude-variable heavy-load fork comprises an amplitude-variable driving assembly, a bidirectional rotating screw rod assembly and a fork assembly, wherein the bidirectional rotating screw rod assembly is connected with the amplitude-variable driving assembly through transmission, and the fork assembly is connected with the bidirectional rotating screw rod assembly through transmission; the amplitude-variable driving assembly comprises an amplitude-variable driving motor; the bidirectional rotary screw rod assembly comprises a left-handed screw rod with left-handed threads, a right-handed screw rod with right-handed threads, a left-handed nut in matched connection with the left-handed screw rod and a right-handed nut in matched connection with the right-handed screw rod, wherein the left-handed screw rod and the right-handed screw rod are fixedly connected, and the outer end of the left-handed screw rod or the outer end of the right-handed screw rod is in transmission connection with an amplitude-variable driving motor; the fork assembly comprises a first telescopic fork and a second telescopic fork, the first telescopic fork and the second telescopic fork are in vertical relation with the bidirectional rotary screw rod assembly, the first telescopic fork is arranged above the left-handed nut, the first telescopic fork is connected with the left-handed nut, the second telescopic fork is arranged above the right-handed nut, and the second telescopic fork is connected with the right-handed nut.

Further, the fork assembly further comprises a fork telescopic driving motor and a connecting rod, one end of the connecting rod is connected to the fork telescopic driving motor, and the other end of the connecting rod sequentially passes through the first telescopic fork and the second telescopic fork.

Further, the thread length of the left-handed section screw is the same as that of the right-handed section screw.

Further, the thread shape of the left-handed screw is 30-degree trapezoid, and the thread shape of the right-handed screw is 30-degree trapezoid.

Further, the bidirectional amplitude variation heavy-duty fork comprising the screw rod further comprises a first outer side fixing piece, a first inner side fixing piece, a second outer side fixing piece and a second inner side fixing piece; the first outer side fixing piece is connected with one end of the left-handed nut in a matched mode, the first inner side fixing piece is connected with the other end of the left-handed nut in a matched mode, and the first telescopic fork is located between the first outer side fixing piece and the first inner side fixing piece; the second outside mounting is connected with the one end cooperation of right-hand nut, the inboard mounting of second is connected with the other end cooperation of right-hand nut, the flexible fork of second is located between second outside mounting and the inboard mounting of second.

Further, the first outer fixing piece, the first inner fixing piece, the second outer fixing piece and the second inner fixing piece all comprise through holes, the first outer fixing piece is connected with one end of the left-handed nut in a matched mode through the through holes, and the first inner fixing piece is connected with the other end of the left-handed nut in a matched mode through the through holes; the second outside mounting passes through the through-hole and is connected with the one end cooperation of right-hand nut, the inboard mounting of second passes through the through-hole and is connected with the other end cooperation of right-hand nut.

Further, the first telescopic fork comprises a first fixed fork arm, a first middle fork arm which is positioned above the first fixed fork arm and is movably connected with the first fixed fork arm, and a first front fork arm which is positioned above the first middle fork arm and is movably connected with the first middle fork arm; the second telescopic fork comprises a second fixed fork arm, a second middle fork arm and a second front fork arm, the second middle fork arm is positioned above the second fixed fork arm and is movably connected with the second fixed fork arm, and the second front fork arm is positioned above the second middle fork arm and is movably connected with the second middle fork arm;

the fixed fork arm of connecting rod is characterized in that a first through hole matched with the connecting rod is formed below the first fixed fork arm, a second through hole matched with the connecting rod is formed below the second fixed fork arm, and the connecting rod sequentially passes through the first through hole below the first fixed fork arm and the second through hole below the second fixed fork arm.

Further, the bidirectional amplitude-variable heavy-load fork comprising the screw rod further comprises a first linear guide rail and a second linear guide rail, wherein the bidirectional rotating screw rod assembly is positioned between the first linear guide rail and the second linear guide rail, and the first linear guide rail and the second linear guide rail are in parallel relation with the bidirectional rotating screw rod assembly;

one end of the first fixed fork arm is in sliding connection with the first linear guide rail, and the other end of the first fixed fork arm is in sliding connection with the second linear guide rail; one end of the second fixed fork arm is in sliding connection with the first linear guide rail, and the other end of the second fixed fork arm is in sliding connection with the second linear guide rail.

Further, the bidirectional rotary screw rod assembly is located at an intermediate position between the first linear guide rail and the second linear guide rail.

Further, a connecting through hole is arranged below the amplitude-variable driving motor, and the outer end of the left-handed section screw rod or the outer end of the right-handed section screw rod is directly connected with the connecting through hole of the amplitude-variable driving motor.

The beneficial effects are that: compared with the prior art, the utility model has the advantages that:

1. according to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, the size of the fork is not required to be manually adjusted, the load center between the forks is changed through the amplitude-variable driving assembly and the bidirectional rotating screw rod assembly connected with the amplitude-variable driving assembly through transmission so as to adapt to heavy-load cargos with different sizes and widths, a plurality of conveyors or a plurality of forks are not required to finish layer changing of different heavy-load cargos, single equipment is realized, the automatic amplitude-variable function of the fork is realized, the probability of overturning heavy objects when the forks transport the heavy-load cargos is reduced, the stability is high, meanwhile, the equipment quantity is effectively reduced, the equipment failure rate is reduced, the operation cost is reduced, the actual needs are flexibly adapted, and the bidirectional amplitude-variable heavy-load fork has good applicability and expansibility.

2. According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, the bidirectional rotating screw rod is adopted, and is provided with a half-left-handed and half-right-handed thread structure, namely, the thread length of the left-handed screw rod is the same as that of the right-handed screw rod, so that the travel of the nut in the sliding process is the same, and the accuracy and stability of the sliding process are improved.

3. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, the bidirectional rotating screw rod is adopted, and the self-locking property and the transmission efficiency of the bidirectional rotating screw rod are improved through the cooperation of the left-handed screw rod and the left-handed nut on the bidirectional rotating screw rod and the cooperation of the right-handed screw rod and the right-handed nut; meanwhile, the 30-degree trapezoidal screw rod is adopted, so that the nut can be accurately positioned in the sliding process, the bearing capacity of the bidirectional rotary screw rod is increased, and the phenomenon that heavy load goods topple over in the operation process is effectively reduced.

4. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, when different heavy loads are forked by the bidirectional amplitude-variable heavy-load fork, the load centers of the heavy loads are not in the same position, and the position of the forked gravity center is changed in an amplitude-variable moving mode in the direction of the screw rod so as to adapt to the sizes of different loads and improve the applicability; meanwhile, the fixing pieces are used on two sides of the nut, the nut and the fixing pieces are matched through the through holes, so that the phenomenon of overturning in the forking process is avoided, and the stability of the bidirectional amplitude-variable fork in moving on the screw rod is improved.

5. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, when a layer is replaced, the fork is driven by the telescopic driving motor to stretch, so that the operations of forking heavy-load cargoes, conveying the heavy-load cargoes to a designated layer and the like are completed; meanwhile, the telescopic driving motor is directly connected with the connecting rod to drive the fork to carry out telescopic operation, so that energy loss is reduced, and the efficiency and stability of forking heavy-load cargoes are improved.

6. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, the sliding component is adopted to reduce friction resistance in the amplitude-variable moving process of the fork, so that the amplitude-variable fork is more flexible in actual amplitude-variable operation, and the amplitude-variable moving efficiency is improved.

7. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, the bidirectional rotating screw rod assembly is positioned at the middle position between the first linear guide rail and the second linear guide rail, so that the bidirectional rotating screw rod assembly is more uniformly stressed, can bear heavier load, resists the problems of deformation and the like caused in the moving process of heavy-load cargoes, and improves the stability of the bidirectional amplitude-variable heavy-load fork structure.

8. According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, the amplitude-variable driving motor is positioned on one side of the supporting base, compared with the position below the supporting base, the bidirectional amplitude-variable heavy-duty fork provided by the utility model has the advantages that the space below the base is saved, the height of the base is reduced, and the stability of the whole device is improved; meanwhile, the amplitude-variable driving motor is not provided with a transmission device, such as a belt or a chain or a steel wire rope, a gear box and other parts, but is directly connected to the bidirectional rotating screw rod to realize driving, and electric energy is directly converted into mechanical energy to drive the bidirectional rotating screw rod, so that the device is simplified in structure, fast in response speed and quiet in operation, and meanwhile, the whole bidirectional amplitude-variable heavy-load fork is reduced in energy consumption, higher in efficiency, higher in speed and higher in precision during operation, and maintenance cost is reduced.

9. According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, a plurality of conveyors or a plurality of fixed forks are not needed, only one bidirectional amplitude-variable heavy-duty fork comprising the screw rod is needed, the bidirectional amplitude-variable heavy-duty fork device is arranged on a loading platform of a hoisting machine, when a layer is replaced, different cargoes such as a tray, an omnidirectional vehicle and the like can be forked by only moving the amplitude-variable fork, the bidirectional amplitude-variable heavy-duty fork device can fork the layer of the different cargoes such as a tray, the fork and the like, the workload of a plurality of devices is realized before the bidirectional amplitude-variable heavy-duty fork device is completed through a single device, the number of the devices is reduced, the cost is reduced, the workload of workers is reduced, and the failure rate of the devices is reduced.

10. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, when a layer is replaced, the load center between the forks can be changed by accurate amplitude-variable movement so as to adapt to heavy loads with different size and width, the bidirectional amplitude-variable heavy-load fork well adapts to different size requirements of a tray and an omnidirectional vehicle, the tray and the omnidirectional vehicle are prevented from overturning, and the stability and the applicability of the bidirectional amplitude-variable heavy-load fork are improved.

Drawings

FIG. 1 is a schematic diagram of a luffing motion of a bi-directional luffing heavy load pallet fork including a lead screw.

Fig. 2 is a schematic diagram of a bi-directional rotating screw assembly.

Fig. 3 is a schematic diagram of the working principle of the bidirectional rotary screw.

FIG. 4 is a schematic diagram of the position and size of the pallet after the two-way luffing heavy-duty fork luffing movement is adapted to the pallet.

Fig. 5 is a schematic diagram of the rear position size of the bidirectional luffing heavy load fork luffing movement adaptive omni-directional vehicle.

Reference numerals illustrate:

1. a luffing drive assembly; 11. a variable amplitude driving motor; 12. a motor fixing member; 2. a bi-directional rotating screw assembly; 21. a left-handed section screw; 22. a right-handed section screw rod; 23. a left-handed nut; 24. a right-handed nut; a 25 screw rod base; 3. a fork assembly; 31. a first telescoping fork; 32. a second telescoping fork; 33. a fork telescopic driving motor; 34. a connecting rod; 311. a first fixed yoke; 312. a first middle yoke; 313. a first front fork arm; 321. a second fixed yoke; 322. a second middle yoke; 323. a second front fork arm; 4. a bottom support assembly; 41. a first support base; 42. a second support base; 43. a third support base; 44. a fourth support base; 5. a fixing member; 51. a first outer fixing member; 52. a first inner fixing member; 53. a second outside mount; 54. a second inner fixing member; 6. a sliding assembly; 61. a first linear guide rail; 62. a second linear guide rail; 7. a tray; 8. an omnidirectional vehicle.

Detailed Description

The utility model will be further described with reference to the drawings and the specific examples.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, as well as a specific direction configuration and operation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1

According to the bidirectional amplitude variation heavy-duty fork comprising the screw rod, referring to fig. 1, the bidirectional amplitude variation heavy-duty fork comprises an amplitude variation driving assembly 1, a bidirectional rotation screw rod assembly 2 connected with the amplitude variation driving assembly 1 through transmission and a fork assembly 3 connected with the bidirectional rotation screw rod assembly 2 through transmission, wherein the amplitude variation driving assembly 1 works to drive the bidirectional rotation screw rod assembly 2 to work, and the bidirectional rotation screw rod assembly 2 works to drive the fork assembly 3 to work, so that bidirectional amplitude variation heavy-duty fork work is realized;

The amplitude-variable driving assembly 1 comprises a motor fixing piece 12 and an amplitude-variable driving motor 11 fixed on the motor fixing piece 12; the bidirectional rotating screw rod assembly 2 comprises a left-handed screw rod 21 with left-handed threads, a right-handed screw rod 22 with right-handed threads, a left-handed nut 23 which is in matched connection with the left-handed screw rod 21, and a right-handed nut 24 which is in matched connection with the right-handed screw rod 22, wherein the left-handed screw rod 21 and the right-handed screw rod 22 are fixedly connected, the outer end of the left-handed screw rod 21 or the outer end of the right-handed screw rod 22 is in transmission connection with the luffing drive motor 11, in the embodiment, the screw rod near one side of the luffing drive motor 11 is defined as the right-handed screw rod 22, and the other section is defined as the left-handed screw rod 21, when the luffing drive motor 11 works, the right-handed screw rod 22 is driven to rotate, the right-handed screw nut 24 which is in matched connection with the right-handed screw rod 22 is driven to rotate, and the left-handed screw rod 21 is driven to rotate the left-handed nut 23 which is in matched connection with the left-handed screw rod 21; the fork assembly 3 includes a first telescopic fork 31 and a second telescopic fork 32, the first telescopic fork 31 and the second telescopic fork 32 are in a vertical relationship with the bidirectional rotary screw rod assembly 2, the first telescopic fork 31 and the second telescopic fork 32 are in a parallel relationship, the first telescopic fork 31 is arranged above the left-handed nut 23, the first telescopic fork 31 is connected with the left-handed nut 23, the second telescopic fork 32 is arranged above the right-handed nut 24, the second telescopic fork 32 is connected with the right-handed nut 24, and the right-handed nut 24 rotates to drive the second telescopic fork 32 arranged above the right-handed nut 24 to move, and the left-handed nut 23 rotates to drive the first telescopic fork 31 arranged above the left-handed nut 23 to move.

In this embodiment, when the amplitude-variable driving motor 11 is operated, the left-hand section screw rod 21 and the right-hand section screw rod 22 are driven to rotate, so as to drive the left-hand nut 23 in matched connection with the left-hand section screw rod 21 and the right-hand nut 24 in matched connection with the right-hand section screw rod 22 to move on the screw rod, so that the left-hand nut 23 drives the first telescopic fork 31 arranged above the left-hand nut 23 to move on the screw rod, and the right-hand nut 24 drives the second telescopic fork 32 arranged above the right-hand nut 24 to move on the screw rod, thereby realizing the amplitude-variable width of the fork.

The bidirectional amplitude-variable heavy-load fork comprising the screw rod does not need to manually adjust the size of the fork again, does not need a plurality of conveyors or a plurality of forks to finish the layer change of different heavy-load cargoes, realizes that single equipment gives consideration to cargoes of different sizes, realizes the automatic amplitude-variable function of the forks, changes the load center between the forks to adapt to the heavy-load cargoes of different sizes and widths, reduces the probability of overturning heavy objects when the forks transport the heavy-load cargoes, has high stability, can adapt to cargoes of different sizes through amplitude variation when the cargoes change the layer, effectively reduces the equipment number, reduces the equipment failure rate, reduces the operation cost, flexibly adapts to actual needs, and has good applicability and expansibility.

Example 2

According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, based on the embodiment 1, referring to fig. 2, the adopted bidirectional rotating screw rod is provided with a half left-handed and half right-handed thread structure, namely a thread structure of a left-handed screw rod 21 and a thread structure of a right-handed screw rod 22, wherein the thread length of the left-handed screw rod 21 is the same as that of the right-handed screw rod 22; the thread shape of the left-handed section screw 21 is 30-degree trapezoid, and the thread shape of the right-handed section screw 22 is 30-degree trapezoid.

Specifically, the inside of the left-handed nut is provided with a thread structure matched with the thread structure of the left-handed screw 21, the inside of the right-handed nut 24 is provided with a thread structure matched with the thread structure of the right-handed screw 22, so that the left-handed screw 21 is matched and connected with the left-handed nut 23, the right-handed screw 22 is matched and connected with the right-handed nut 24, the left-handed screw 21 and the right-handed screw 22 are fixedly connected, in practical application, the left-handed screw 21 and the right-handed screw 22 are integrally formed, the other end of the left-handed screw 21 is rotatably connected with the screw base 25 through a screw through hole of the screw base 25, and the other end of the right-handed screw 212 is rotatably connected with the amplitude driving motor 11 through a through hole below the amplitude driving motor 11. The bidirectional amplitude-variable heavy-load fork comprising the screw rod adopts the bidirectional rotary screw rod, and the self-locking property and the transmission efficiency of the bidirectional rotary screw rod are improved through the cooperation of the left-handed screw rod on the bidirectional rotary screw rod and the left-handed nut and the cooperation of the right-handed screw rod and the right-handed nut; meanwhile, the 30-degree trapezoidal screw rod is adopted, so that the nut can be accurately positioned in the moving process, the bearing capacity of the bidirectional rotary screw rod is increased, and the phenomenon that heavy load goods topple over in the operating process is effectively reduced.

Referring to fig. 3 (a), when the luffing drive motor 11 rotates forward, the luffing drive motor 11 drives the right-hand section screw rod 22 connected with the luffing drive motor 11 to rotate forward, the right-hand section screw rod 22 drives the right-hand nut 24 matched with the right-hand section screw rod 22 to move towards the center of the screw rod, and the right-hand nut 24 drives the second telescopic fork 32 positioned above the right-hand nut 24 to move towards the center of the screw rod; the amplitude-variable driving motor 11 drives the left-hand section screw rod 21 fixedly connected with the right-hand section screw rod 22 to reversely rotate, the left-hand section screw rod 21 drives the left-hand nut 23 matched with the left-hand section screw rod 21 to move towards the center of the screw rod, and the left-hand nut 23 drives the first telescopic fork 31 positioned above the left-hand nut 23 to move towards the center of the screw rod; at this time, the first telescopic fork 31 and the second telescopic fork 32 are both close to the center of the screw rod, so that the distance between the two forks is continuously changed, and the distance between the two forks is shortened;

referring to fig. 3 (b), when the luffing drive motor 11 is reversed, the luffing drive motor 11 drives the right-handed screw 22 connected with the luffing drive motor 11 to reversely rotate, the right-handed screw 22 drives the right-handed nut 24 matched with the right-handed screw 22 to move away from the center of the screw, the right-handed nut 24 moves towards the direction approaching the luffing drive motor 11, the right-handed nut 24 drives the second telescopic fork 32 positioned above the right-handed nut 24 to move away from the center of the screw, and the second telescopic fork 32 moves towards the direction approaching the luffing drive motor 11; the amplitude-variable driving motor 11 drives the left-hand section screw rod 21 fixedly connected with the right-hand section screw rod 22 to rotate forwards, the left-hand section screw rod 21 drives a left-hand nut 23 matched with the left-hand section screw rod 21 to move away from the center of the screw rod, the left-hand nut 23 moves towards the direction close to the screw rod base 25, the left-hand nut 23 drives a first telescopic fork 31 above the left-hand nut 23 to move away from the center of the screw rod, and the first telescopic fork 31 moves towards the direction close to the screw rod base 25; at this time, the first telescopic fork 31 and the second telescopic fork 32 are separated from each other to both sides away from the center of the screw rod, so that the distance between the two forks is continuously changed, and the distance between the two forks is increased.

In the embodiment, the amplitude-variable driving motor drives the right-hand section screw rod and the left-hand section screw rod to rotate, so that the right-hand section screw rod drives the right-hand nut to move on the screw rod, and the right-hand nut drives the second telescopic fork to move on the screw rod; and the left-handed screw drives the left-handed nut to move on the screw rod, and then the left-handed nut drives the first telescopic fork to move on the screw rod, so that amplitude-variable movement between the two forks is realized.

The bidirectional amplitude-variable heavy-load fork comprising the screw rod adopts a bidirectional rotating screw rod, the thread length of the left-handed screw rod 21 is the same as that of the right-handed screw rod 22, so that the strokes of the left-handed nut and the right-handed nut are the same in the moving process of the screw rod, the accuracy of dimension grasping in the moving process of the fork is improved, the overturning probability of the fork in the moving process of driving heavy-load goods is reduced, and the moving stability of the fork driving heavy-load goods is improved.

Example 3

A bidirectional amplitude variation heavy-duty fork including a lead screw of the present embodiment, based on embodiment 1, referring to fig. 1, the bidirectional amplitude variation heavy-duty fork further includes a fixing member 5, the fixing member 5 including a first outer fixing member 51, a first inner fixing member 52, a second outer fixing member 53, and a second inner fixing member 54; the first outer fixing piece 51 is in fit connection with one end of the left-handed nut 23, the first inner fixing piece 52 is in fit connection with the other end of the left-handed nut 23, the first telescopic fork 31 is located between the first outer fixing piece 51 and the first inner fixing piece 52, and the first telescopic fork 31 is located above the left-handed nut 23; the second outer fixing piece 53 is cooperatively connected with one end of the right-handed nut 21, the second inner fixing piece 54 is cooperatively connected with the other end of the right-handed nut 24, the second telescopic fork 32 is located between the second outer fixing piece 53 and the second inner fixing piece 54, and the second telescopic fork 32 is located above the right-handed nut 21.

The first outer fixing member 51, the first inner fixing member 52, the second outer fixing member 53 and the second inner fixing member 54 each include a through hole, the first outer fixing member 51 is connected with one end of the left-handed nut 23 in a matching manner through the through holes, the first inner fixing member 52 is connected with the other end of the left-handed nut 23 in a matching manner through the through holes, and the left-handed nut 23 can drive the first outer fixing member 51 and the first inner fixing member 52 to move on the screw when moving on the screw; the second outer fixing piece 53 is connected with one end of the right-handed nut 24 in a matching way through the through hole, the second inner fixing piece 54 is connected with the other end of the right-handed nut 24 in a matching way through the through hole, and the second outer fixing piece 53 and the second inner fixing piece 54 can be driven to move on the screw when the right-handed nut 24 moves on the screw.

In this embodiment, when the bidirectional rotating screw rod rotates, the left-hand section screw rod 21 drives the left-hand nut 23 matched with the left-hand section screw rod 21 to move on the screw rod, the left-hand nut 23 drives the first outer side fixing piece 51 and the first inner side fixing piece 52 to move on the screw rod, the left-hand nut 23 drives the first telescopic fork 31 positioned above the left-hand nut 23 to move on the screw rod, and the first telescopic fork 31 is positioned between the first outer side fixing piece 51 and the first inner side fixing piece 52, so that the first telescopic fork 31 drives the goods to move on the screw rod to keep stable; the right-hand section screw rod 22 drives a right-hand nut 24 matched with the right-hand section screw rod 22 to move on the screw rod, the right-hand nut 24 drives a second outer side fixing piece 53 and a second inner side fixing piece 54 to move on the screw rod, the right-hand nut 24 drives a second telescopic fork 32 positioned above the right-hand nut 24 to move on the screw rod, and the second telescopic fork 32 is positioned between the second outer side fixing piece 53 and the second inner side fixing piece 54, so that the second telescopic fork 32 keeps stable when driving goods to move on the screw rod; in the process of rotating the screw rod, the screw rod drives the left-handed nut 23 and the right-handed nut 24 to move on the screw rod, so that the distance between the two nuts is continuously changed, and further, the distance between the first telescopic fork 31 positioned above the left-handed nut 23 and the second telescopic fork 32 positioned above the right-handed nut 24 is continuously changed, namely, the load centers of the two forks are also changed; through using the mounting in nut both sides, nut and mounting pass through the through-hole cooperation and use, avoid the fork to get the phenomenon that the heavy load goods in-process produced the toppling, improved the stability when two-way luffing fork moves on the lead screw. According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, when different heavy loads are forked by the bidirectional amplitude-variable heavy-load fork, the position of the center of gravity of the forked heavy loads is changed in a mode of amplitude-variable movement in the direction of the screw rod aiming at the fact that the load centers of the heavy loads are not in the same position, so that the bidirectional amplitude-variable heavy-load fork is suitable for the sizes of different loads, and the applicability of the bidirectional amplitude-variable heavy-load fork is improved.

Example 4

According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, based on the embodiment 3, referring to fig. 1, the fork assembly 3 further comprises a fork telescopic driving motor 33 and a connecting rod 34, one end of the connecting rod 34 is directly connected to the fork telescopic driving motor 33, one end of the connecting rod 34 is rotationally connected with the fork telescopic driving motor 33, and the other end of the connecting rod 34 sequentially passes through the first telescopic fork 31 and the second telescopic fork 32.

The first telescopic fork 31 includes a first fixed fork arm 311, a first middle fork arm 312 disposed above the first fixed fork arm 311 and movably connected to the first fixed fork arm 311, and a first front fork arm 313 disposed above the first middle fork arm 312 and movably connected to the first middle fork arm 312, wherein the first fixed fork arm 311 is fixed and not moved when the first telescopic fork 31 is telescopic, the first middle fork arm 312 moves on the first fixed fork arm 311, and the first front fork arm 313 moves on the first middle fork arm 312, such that the length of the first telescopic fork 31 is changed;

the second telescopic fork 32 includes a second fixed fork arm 321, a second middle fork arm 322 disposed above the second fixed fork arm 321 and movably connected to the second fixed fork arm 321, and a second front fork arm 323 disposed above the second middle fork arm 322 and movably connected to the second middle fork arm 322, wherein the second fixed fork arm 321 is fixed and not moved, the second middle fork arm 322 moves on the second fixed fork arm 321, and the second front fork arm 323 moves on the second middle fork arm 322, such that the length of the second telescopic fork 32 is changed when the second telescopic fork 32 stretches.

The first through hole matched with the connecting rod 34 is formed below the first fixed fork arm 311, the second through hole matched with the connecting rod 34 is formed below the second fixed fork arm 321, and the connecting rod 34 sequentially passes through the first through hole below the first fixed fork arm 311 and the second through hole below the second fixed fork arm 321, so that the connecting rod 34 sequentially passes through the first telescopic fork 31 and the second telescopic fork 32.

When the layer of the heavy cargo is changed, the heavy cargo on the goods shelf is forked through the bidirectional amplitude heavy-duty fork, the fork telescopic driving motor 33 drives the first telescopic fork 31 and the second telescopic fork 32 which are in a contracted state to extend, and when the first front fork arm 313 of the first telescopic fork 31 and the second front fork arm 323 of the second telescopic fork 32 extend to the appointed cargo position at the same time, the fork telescopic driving motor 33 stops working; when the bidirectional amplitude-variable heavy-load fork drives heavy-load goods to leave the goods shelf, the fork telescopic driving motor 33 drives the first telescopic fork 31 and the second telescopic fork 32 to shrink, and when the first front fork arm 313 of the first telescopic fork 31 and the second front fork arm 323 of the second telescopic fork 32 simultaneously shorten and drive the goods to leave the goods shelf and restore to a shrinking state, the fork telescopic driving motor 33 stops working.

According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, when a layer of a load is replaced, the fork is driven by the fork telescopic driving motor to stretch and retract, so that the operations of taking the heavy-load, conveying the heavy-load to a designated layer and the like are completed; meanwhile, the fork telescopic driving motor is directly connected with the connecting rod to drive the fork to carry out telescopic operation, so that energy loss in the working process is reduced, the efficiency of taking heavy-load goods by the fork is improved, the stability of the heavy-load goods when the layer is replaced is improved, and the overturning phenomenon is reduced.

Example 5

A bidirectional amplitude varying heavy load pallet fork according to this embodiment, comprising a screw, further comprising a bottom support assembly 4 and a sliding assembly 6, based on embodiment 4, with reference to fig. 1.

Referring to fig. 1, the direction in which the bidirectional screw is located is an X direction, and the direction perpendicular to the bidirectional screw is a Y direction.

The bottom support assembly 4 includes a first support base 41, a second support base 42, and a third support base 43 and a fourth support base 44 disposed over the first support base 41 and the second support base 42 and disposed along the X direction, where the first support base 41 and the second support base 42 are spaced apart by a certain distance and are in parallel relation to each other, the third support base 43 and the fourth support base 44 are spaced apart by a certain distance and are in parallel relation to each other, the third support base 43 and the first support base 41 are in vertical relation, the third support base 43 and the first support base 41 are fixedly connected by a screw, the third support base 43 and the second support base 42 are fixedly connected by a screw, the fourth support base 44 and the first support base 41 are fixedly connected by a screw, and the fourth support base 44 and the second support base 42 are fixedly connected; the bottoms of the first support base 41 and the second support base 42 are respectively provided with a plurality of support members, and the support members have a certain thickness, so that gaps are reserved between the bottoms of the first support base 41 and the second support base 42 and the cargo carrying platform, the friction between the bottoms and the cargo carrying platform is reduced, and the bearing performance and the stability of the whole bottom support assembly 4 are improved.

The amplitude-variable driving assembly 1, the bidirectional rotary screw rod assembly 2 and the fork assembly 3 are arranged above the bottom supporting assembly 4, specifically, an amplitude-variable driving motor 11 of the amplitude-variable driving assembly 1 is fixed on a motor fixing piece 12, and the motor fixing piece 12 is fixedly connected to a second supporting base 42; the screw base 25 of the bidirectional rotary screw assembly 2 is fixedly connected to the first supporting base 41; one end of a bidirectional rotary screw rod is rotatably connected with the variable amplitude driving motor 11 through a through hole below the variable amplitude driving motor 11 positioned on the second supporting base 42, the other end of the bidirectional rotary screw rod is rotatably connected with the screw rod base 25 through a screw rod through hole of the screw rod base 25 positioned on the first supporting base 41, the first supporting base 41 and the second supporting base 42 are arranged along the Y direction, the bidirectional rotary screw rod assembly 2 is arranged along the X direction vertical to the first supporting base 41 and the second supporting base 42, and the bidirectional rotary screw rod assembly 2 is parallel to the third supporting base 43 and the fourth supporting base 44 and positioned between the third supporting base 43 and the fourth supporting base 44; the forks of the fork assembly 3 are positioned above the bi-directional rotary screw assembly 2 in a vertical relationship with the bi-directional rotary screw assembly 2 and in a vertical relationship with the first support base 41 and the second support base 42. In this embodiment, the amplitude-variable driving motor 11 drives the bidirectional rotating screw rod assembly 2 to rotate, and the bidirectional rotating screw rod assembly 2 drives the fork above the screw rod to move in amplitude variation on the bidirectional screw rod.

The sliding assembly 6 includes a first linear guide 61 placed on the third support base 43 and a second linear guide 62 placed on the fourth support base 44, the first linear guide 61 and the second linear guide 62 being placed along the X direction; the bidirectional rotary screw rod assembly 2 is positioned between the first linear guide rail 61 and the second linear guide rail 62, and the first linear guide rail 61 and the second linear guide rail 62 are in parallel relation with the bidirectional rotary screw rod assembly 2;

the forks in the fork assembly 3 are in a vertical relationship with the first support base 42 and the second support base 42, specifically, the first fork 31 and the second fork 32 are in a vertical relationship with the first support base 42 and the second support base 42, wherein the first fork 31 is in sliding connection with the first linear guide rail 61 through one end of the first fixed fork arm 311 and in sliding connection with the second linear guide rail 62 through the other end of the first fixed fork arm 311, so that when the left-handed nut 23 drives the first fixed fork arm 311 to move on the screw rod, the first fixed fork arm 311 slides on the first linear guide rail 61 and the second linear guide rail 62 at the same time, and the first fork 31 slides on the first linear guide rail 61 and the second linear guide rail 62; the second fork 32 is slidably connected with the first linear guide rail 61 through one end of the second fixed fork arm 321 and is slidably connected with the second linear guide rail 62 through the other end of the second fixed fork arm 321, so that when the right-handed nut 24 drives the second fixed fork arm 321 to move on the screw rod, the second fixed fork arm 321 slides on the first linear guide rail 61 and the second linear guide rail 62 at the same time, and further the second fork 32 slides on the first linear guide rail 61 and the second linear guide rail 62. In this embodiment, when the bidirectional rotary screw assembly 2 drives the fork above the screw to perform amplitude-variable movement on the bidirectional screw, the fork slides on the first linear guide rail 61 and the second linear guide rail 62 at the same time.

According to the embodiment, the sliding component is adopted to reduce friction resistance in the variable amplitude moving process of the fork, so that the variable amplitude fork is more flexible in actual variable amplitude operation, and the variable amplitude moving efficiency is improved.

Example 6

According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, based on embodiment 5, referring to fig. 1, the bidirectional rotary screw rod assembly 2 is located between the first linear guide rail 61 and the second linear guide rail 62, and the bidirectional rotary screw rod assembly 2 is located at an intermediate position between the first linear guide rail 61 and the second linear guide rail 62, so that the bidirectional rotary screw rod assembly is stressed more uniformly.

Specifically, two ends of the first fixed fork arm 311 are respectively slidably connected to the first linear guide rail 61 and the second linear guide rail 62, the first fixed fork arm 311 is perpendicular to the first linear guide rail 61, the second linear guide rail 62 and the bidirectional rotary screw assembly 2, the first fixed fork arm 311 is located above the left-hand nut 23 in the bidirectional rotary screw assembly 2, the bidirectional rotary screw assembly 2 is located at an intermediate position between the first linear guide rail 61 and the second linear guide rail 62, and the left-hand nut 23 is located at an intermediate position of the first fixed fork arm 311; the two ends of the second fixed fork arm 321 are respectively and slidably connected to the first linear guide rail 61 and the second linear guide rail 62, the second fixed fork arm 321 is perpendicular to the first linear guide rail 61, the second linear guide rail 62 and the bidirectional rotary screw assembly 2, the second fixed fork arm 321 is located above the right-hand nut 24 in the bidirectional rotary screw assembly 2, the bidirectional rotary screw assembly 2 is located at an intermediate position between the first linear guide rail 61 and the second linear guide rail 62, and the right-hand nut 24 is located at an intermediate position of the second fixed fork arm 321. In this embodiment, the bidirectional rotary screw assembly 2 is located at the middle position between the first linear guide rail 61 and the second linear guide rail 62, the left-handed nut 23 is located at the middle position of the first fixed fork arm 311, and the right-handed nut 24 is located at the middle position of the second fixed fork arm 321, so that the variable amplitude driving motor 11 drives the bidirectional rotary screw to move, when the bidirectional rotary screw drives the fork to move, the stress of the bidirectional rotary screw is more uniform, the screw can bear heavier load, and the problems of deformation and the like caused in the moving process of heavy-load goods are resisted, thereby improving the stability of the bidirectional variable amplitude heavy-load fork structure.

The amplitude-variable driving motor 11 is located on the second supporting base 42, a connecting through hole is arranged below the amplitude-variable driving motor 11, one end of the screw rod of the bidirectional rotating screw rod assembly 2 is directly connected with the connecting through hole of the amplitude-variable driving motor 11, and when the amplitude-variable driving motor 11 is driven, the bidirectional rotating screw rod is directly driven to rotate, so that energy consumption caused by friction of a conveyor belt and the like is reduced, and the driving force of the amplitude-variable driving motor 11 is larger. The amplitude-variable driving motor is arranged on the supporting base, so that compared with the amplitude-variable driving motor arranged below the supporting base, the amplitude-variable driving motor saves the space below the base, reduces the height of the base and improves the stability of the whole device; meanwhile, the amplitude-variable driving motor is not provided with a transmission device, such as a belt or a chain or a steel wire rope, a gear box and other parts, but is directly connected to the bidirectional rotating screw rod to realize driving, and electric energy is directly converted into mechanical energy to drive the bidirectional rotating screw rod, so that the device is simplified in structure, fast in response speed and quiet in operation, and meanwhile, the whole bidirectional amplitude-variable heavy-load fork is reduced in energy consumption, higher in efficiency, higher in speed and higher in precision during operation, and maintenance cost is reduced.

Example 7

According to the bidirectional amplitude-variable heavy-load fork comprising the screw rod, based on the embodiment 1, when the bidirectional amplitude-variable heavy-load fork comprising the screw rod is used for carrying out layer change operation on goods in a warehouse, a rail is arranged on a goods shelf of the warehouse, the goods can be transported on the rail of the goods shelf, and equipment required by the layer change operation in the embodiment comprises: the bidirectional amplitude heavy-load fork is placed on a cargo carrying platform of the elevator during the layer changing operation, and the specific layer changing operation is as follows:

Firstly, heavy-load goods needing to be changed in layers are transported to an entrance of a lifting machine through a rail for waiting, the lifting machine controls bidirectional amplitude-variable heavy-load fork equipment on a cargo carrying platform to stop at the floor position of a goods shelf needing to be changed in layers, the size of the heavy-load goods needing to be changed in layers is confirmed, and a gap is reserved between a fork surface of the bidirectional amplitude-variable heavy-load fork equipment and a fork taking surface of the heavy-load goods at the moment so that the goods cannot be collided when the fork stretches out;

then, the fork performs width amplitude movement on the cargo bed, specifically: the amplitude-variable driving motor 11 drives (including forward rotation or reverse rotation) the left-hand section screw rod 21 and the right-hand section screw rod 22 of the bidirectional rotary screw rod, the left-hand section screw rod 21 drives the left-hand nut 23 which is in matched connection with the left-hand section screw rod 21 and the right-hand section screw rod 22 drives the right-hand nut 24 which is in matched connection with the right-hand section screw rod 22 to move on the screw rod, the left-hand nut 23 drives the first telescopic fork 31 and the right-hand nut 24 which are positioned on the left-hand nut 23 to drive the second telescopic fork 32 which is positioned on the right-hand nut 24 to move on the screw rod (including moving to the center of the screw rod or moving to the two sides of the screw rod), so that the fork centers of the first telescopic fork 31 and the second telescopic fork 32 are changed to adapt to the size of heavy load goods, and when the forks adapt to the size of the heavy load goods, the amplitude-variable driving motor 11 stops working;

Then, the fork carries out the fork operation of heavy cargo on the cargo carrying platform through length amplitude, specifically: the fork telescopic driving motor 33 drives the first telescopic fork 31 in a contracted state and the second telescopic fork 32 in a contracted state to extend, when the first front fork arm 313 of the first telescopic fork 31 and the second front fork arm 323 of the second telescopic fork 32 extend to a designated position below the fork taking surface at the same time, a gap is reserved between the fork surface of the fork equipment and the fork taking surface of heavy-load goods, and the fork telescopic driving motor 33 stops working; the motor of the cargo carrying platform is driven, the cargo carrying platform drives the bidirectional amplitude-variable heavy-load fork equipment on the cargo carrying platform to integrally upwards, so that the heavy-load cargo is lifted after the fork is fully contacted with the heavy-load cargo, namely, the fork surface is fully contacted with the fork taking surface of the heavy-load cargo without leaving a gap, at the moment, the heavy-load cargo is separated from the track and is positioned on the first front fork arm 313 and the second front fork arm 323, and the motor of the cargo carrying platform stops working; the fork telescopic driving motor 33 works to drive the first telescopic fork 31 in an extension state and the second telescopic fork 32 in an extension state to contract, when the first front fork arm 313 of the first telescopic fork 31 and the second front fork arm 323 of the second telescopic fork 32 are shortened simultaneously and drive heavy load on the forks to leave the goods shelf and restore to a contraction state, the fork telescopic driving motor 33 stops working, and at the moment, the heavy load leaves the goods shelf and is positioned on the bidirectional amplitude-variable fork equipment of the goods carrying platform, and the fork taking operation is completed;

Finally, carrying out layer change operation on heavy cargo, specifically: the motor of the cargo carrying platform of the elevator drives the bidirectional amplitude variation fork equipment and the heavy load on the bidirectional amplitude variation fork equipment to reach a specified floor, and the motor of the cargo carrying platform stops; the fork extension driving motor 33 drives the fork in the contracted state to extend, and after the heavy load on the fork is sent out and reaches a specified position, the heavy load is not contacted with the track at the position, namely, a gap is reserved between the bottom surface of the heavy load and the track surface, and the fork extension driving motor 33 stops working; the motor of the cargo carrying platform drives the bidirectional amplitude variation heavy load fork equipment to integrally downwards, so that after heavy load falls on a track, namely, the fork surface and the fork surface of the heavy load are completely separated, and the bottom surface of the heavy load is in direct contact with the track surface, the motor of the cargo carrying platform stops; the fork telescopic driving motor 33 drives to drive the fork to shrink until the shrinkage state is restored, the fork telescopic driving motor 33 stops working, heavy-load cargoes are transported on the track of the appointed floor at the moment, and the layer changing operation is completed.

In this embodiment, when the distance between the forks is kept unchanged after the first layer changing operation is completed, that is, the fork does not perform the amplitude changing movement, at this time, the center of the fork is at a certain position, including the maximum position, the minimum position or other positions, at this time, the fork only needs to wait for confirming the heavy load goods needing to be changed next time and then move the amplitude changing, so that the operation time is saved, and the operation efficiency is improved.

In the embodiment, when the layers of goods are replaced in the warehouse, a plurality of conveyors or a plurality of fixed forks are not needed, only one lifting machine and one bidirectional amplitude-variable heavy-load fork comprising a screw rod are needed, the bidirectional amplitude-variable heavy-load fork equipment is arranged on a lifting machine carrying table, when the layers are replaced, amplitude-variable movement is carried out on the amplitude-variable fork to fork different goods, the bidirectional amplitude-variable heavy-load fork equipment can take into account to fork different goods such as a pallet, a fork and the like for replacing the layers, the workload of a plurality of equipment before the completion of adopting a single equipment is realized, the reduction of the number of equipment and staff is realized, and the cost and the equipment failure rate are reduced.

Example 8

According to the bidirectional amplitude-variable heavy-duty pallet fork comprising the screw rod of the embodiment, based on embodiment 7, referring to fig. 4, when the bidirectional amplitude-variable heavy-duty pallet fork comprising the screw rod is used for replacing the pallet, the width of the pallet 7 is 1000mm, and the specific operation is as follows:

firstly, the tray 7 needing to be replaced is transported to an entrance of a lifter to wait through a track; the elevator controls the bidirectional amplitude-variable heavy-load fork equipment on the cargo platform to stop at the position of the floor, and confirms the width of the tray 7 needing to be replaced; at the moment, the fork surface of the bidirectional amplitude-variable heavy-load fork device is lower than the fork taking surface of the tray 7, and a gap of about 10mm is formed between the fork surface and the fork taking surface, so that the fork cannot collide with the tray 7 when extending out;

Then, the fork performs width amplitude movement on the cargo bed, specifically: the amplitude-variable driving motor 11 is reversely driven to drive the left-hand section screw rod 21 and the right-hand section screw rod 22 of the bidirectional rotary screw rod to rotate, the left-hand section screw rod 21 drives the left-hand nut 23 which is in matched connection with the left-hand section screw rod 21 and the right-hand section screw rod 22 drives the right-hand nut 24 which is in matched connection with the right-hand section screw rod 22 to move on the screw rod, the left-hand nut 23 drives the first telescopic fork 31 and the right-hand nut 24 which are positioned on the left-hand nut 23 to drive the second telescopic fork 32 which are positioned on the right-hand nut 24 to move on the screw rod in an amplitude-variable manner towards two sides of the screw rod, the fork centers of the first telescopic fork 31 and the second telescopic fork 32 become larger, and the width of the two forks after amplitude variation of the first telescopic fork 31 and the second telescopic fork 32 is 795mm so as to adapt to the size of the tray 7, and the amplitude-variable driving motor 11 stops at the moment;

next, the pallet 7 is subjected to a fork-taking operation by a length-wise amplitude on the loading table, specifically: the fork telescopic driving motor 33 drives the first telescopic fork 31 in a contracted state and the second telescopic fork 32 in a contracted state to extend, when the first telescopic fork 31 and the second telescopic fork 32 extend to a designated position below the fork taking surface of the tray 7 at the same time, a gap of about 10mm is reserved between the fork surface of the fork equipment and the fork taking surface of the tray 7, and the fork telescopic driving motor 33 stops working; the motor of the cargo carrying platform drives the bidirectional amplitude-variable heavy-load fork equipment on the cargo carrying platform to integrally upwards, so that heavy load is lifted after the forks are fully contacted with the tray 7, namely, the fork surface is fully contacted with the fork taking surface of the tray 7 without leaving a gap, the tray 7 is positioned on the first front fork arm 313 and the second front fork arm 323, at the moment, the tray surface is separated from the track surface by about 10mm, and the motor of the cargo carrying platform stops working; the fork telescopic driving motor 33 works to drive the first telescopic fork 31 in an extension state and the second telescopic fork 32 in an extension state to shrink, when the first telescopic fork 31 and the second telescopic fork 32 are shortened simultaneously and drive the pallet 7 on the fork to leave the goods shelf and restore to a shrinkage state, the fork telescopic driving motor 33 stops working, and at the moment, the pallet 7 leaves the goods shelf and is positioned on the bidirectional amplitude-variable fork equipment of the goods carrying platform, and the fork taking operation is completed;

Finally, the pallet 7 is subjected to a layer change operation, specifically: the motor of the cargo carrying platform of the elevator drives the bidirectional amplitude variation fork equipment and the pallet 7 on the bidirectional amplitude variation fork equipment to reach a specified floor, and the motor of the cargo carrying platform stops; the pallet fork telescopic driving motor 33 drives the pallet fork in a contracted state to extend out, after the pallet 7 on the pallet fork is sent out and reaches a specified position, the pallet 7 is not contacted with the track at the position, namely, a gap of about 10mm is reserved between the bottom surface of the pallet and the track surface, and the pallet fork telescopic driving motor 33 stops working; the motor of the cargo carrying platform drives the bidirectional amplitude-variable heavy-load fork equipment to integrally downwards, so that after the pallet 7 falls on a track, namely, the fork surface is completely separated from the fork taking surface of the pallet 7, and the bottom surface of the pallet leg is in direct contact with the track surface, the motor of the cargo carrying platform stops; the pallet fork telescopic driving motor 33 drives to drive the pallet fork to shrink until the pallet fork is restored to a contracted state, the pallet fork telescopic driving motor 33 stops working, the pallet 7 is transported on the track of the appointed floor at the moment, and the layer changing operation is completed.

In the embodiment, when the pallet needs to be replaced, the bidirectional amplitude-variable heavy-load fork moves the fork through the bidirectional screw rod when the pallet is replaced, one side of the bidirectional screw rod rotates leftwards and rightwards to change the load center between the forks through accurate amplitude-variable movement, so that the forks move outwards, the centers of the two forks become larger, the size requirement of the pallet is well met, the pallet and the goods are prevented from overturning, and the stability and the applicability of the bidirectional amplitude-variable heavy-load fork are improved; after the layer changing operation of the pallet is completed, the center of the pallet fork is at the maximum position and keeps the current distance from the maximum position, the heavy load goods waiting for the next layer changing is confirmed to be moved for amplitude changing, and the working efficiency is improved.

Example 9

According to the bidirectional amplitude-variable heavy-duty fork comprising the screw rod, based on the embodiment 8, referring to fig. 5, when the bidirectional amplitude-variable heavy-duty fork comprising the screw rod is used for replacing a layer of an omnidirectional vehicle, the width of the omnidirectional vehicle is 800mm, the space left outside various mechanical parts at the bottom of the omnidirectional vehicle is not very large, meanwhile, the center of the omnidirectional vehicle and the center of a tray in the embodiment 8 are not at the same point, at the moment, bidirectional amplitude-variable heavy-duty fork equipment moves the fork, and the center of the fork is changed by inwards moving the fork, so that overturning can not happen when the omnidirectional vehicle is taken by the fork, and the specific operation is as follows:

firstly, an omnidirectional vehicle needing layer changing drives to an entrance of a lifting machine to wait in place; the elevator controls the bidirectional amplitude-variable heavy-load fork equipment on the cargo platform to stop at the position of the floor, and confirms the width of the omnidirectional vehicle 8 needing to be replaced; at the moment, the fork surface of the bidirectional amplitude-variable heavy-load fork device is lower than the fork taking surface of the omnidirectional vehicle 8, and a gap of about 10mm is reserved between the fork surface and the fork taking surface, so that the fork cannot collide with the omnidirectional vehicle 8 when extending out;

then, the fork performs width amplitude movement on the cargo bed, specifically: the amplitude-variable driving motor 11 is reversely driven to drive the left-hand section screw rod 21 and the right-hand section screw rod 22 of the bidirectional rotary screw rod to rotate, the left-hand section screw rod 21 drives the left-hand nut 23 which is in matched connection with the left-hand section screw rod 21 and the right-hand section screw rod 22 drives the right-hand nut 24 which is in matched connection with the right-hand section screw rod 22 to move on the screw rod, the left-hand nut 23 drives the first telescopic fork 31 and the right-hand nut 24 which are positioned on the left-hand nut 23 to drive the second telescopic fork 32 which are positioned on the right-hand nut 24 to move on the screw rod in an amplitude-variable manner towards two sides of the screw rod, the fork centers of the first telescopic fork 31 and the second telescopic fork 32 become larger, and the width of the two forks after amplitude variation of the first telescopic fork 31 and the second telescopic fork 32 is 450mm so as to adapt to the size of the omnidirectional vehicle 8, and the amplitude-variable driving motor 11 stops at the moment;

Next, the forks perform a fork-taking operation on the omnidirectional vehicle 8 by length amplitude on the cargo bed, specifically: the fork telescopic driving motor 33 drives the first telescopic fork 31 in a contracted state and the second telescopic fork 32 in a contracted state to extend, when the first telescopic fork 31 and the second telescopic fork 32 extend to a designated position below the fork taking surface of the omnidirectional vehicle 8 at the same time, a gap of about 10mm is reserved between the fork surface of the fork equipment and the fork taking surface of the omnidirectional vehicle 8, and the fork telescopic driving motor 33 stops working; the motor of the cargo carrying platform drives the bidirectional amplitude-variable heavy-load fork equipment on the cargo carrying platform to integrally upwards, so that the cargo fork and the omnidirectional vehicle 8 are lifted up after being completely contacted, namely, the fork surface and the fork taking surface of the omnidirectional vehicle 8 are completely contacted without leaving a gap, the omnidirectional vehicle 8 is positioned on the first front fork arm 313 and the second front fork arm 323, at the moment, the bottom surface of the omnidirectional vehicle 8 is separated from the track surface by about 10mm, and the motor of the cargo carrying platform stops working; the fork telescopic driving motor 33 works to drive the first telescopic fork 31 in an extension state and the second telescopic fork 32 in an extension state to shrink, when the first telescopic fork 31 and the second telescopic fork 32 are shortened simultaneously and drive the omnidirectional vehicle 8 on the fork to leave the goods shelf and restore to a shrinkage state, the fork telescopic driving motor 33 stops working, and at the moment, the omnidirectional vehicle 8 leaves the goods shelf and is positioned on bidirectional amplitude-variable fork equipment of the goods carrying platform, and the fork taking operation is completed;

Finally, the omni-directional vehicle 8 is subjected to layer changing operation, specifically: the motor of the cargo carrying platform of the elevator drives the bidirectional amplitude variation fork equipment and the omnidirectional vehicle 8 on the bidirectional amplitude variation fork equipment to reach a specified floor, and the motor of the cargo carrying platform stops; the fork extension driving motor 33 drives the forks in the contracted state to extend, after the omnidirectional vehicle 8 on the forks is sent out and reaches a specified position, the omnidirectional vehicle 8 is not contacted with the track at the position, namely, a gap of about 10mm is reserved between the bottom surface of the omnidirectional vehicle 8 and the track surface, and the fork extension driving motor 33 stops working; the motor of the cargo carrying platform drives the bidirectional amplitude variation heavy-load fork equipment to integrally downwards, so that after the omnidirectional vehicle 8 falls on a track, namely, the fork surface and the fork taking surface of the omnidirectional vehicle 8 are completely separated, and the bottom surface of the omnidirectional vehicle 8 is in direct contact with the track surface, the motor of the cargo carrying platform stops; the fork telescopic driving motor 33 drives to drive the fork to retract until the retraction state is restored, the fork telescopic driving motor 33 stops working, the omnidirectional vehicle 8 is transported on the track of the appointed floor at the moment, and the layer changing operation is completed.

In the embodiment, when the omnidirectional vehicle needs to change layers, the bidirectional amplitude-variable heavy-load fork moves the fork through the bidirectional screw rod when the omnidirectional vehicle changes layers, the unique one-side left-handed and one-side right-handed reverse screw structures of the bidirectional rotating screw rod can accurately change the load center between the forks by amplitude-variable movement, so that the forks move outwards, the centers of the two forks become smaller, the size requirement of the omnidirectional vehicle is well met, the omnidirectional vehicle and the cargoes are prevented from overturning, and the stability and the applicability of the bidirectional amplitude-variable heavy-load fork are improved; after the layer changing operation of the omnidirectional vehicle is completed, the center of the fork is at the minimum position and keeps the current distance from the changing amplitude, and the heavy load goods waiting for the next layer changing is confirmed to be moved for changing amplitude, so that the working efficiency is improved.

The foregoing is only a preferred embodiment of the utility model, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.

Claims

1. A bidirectional amplitude heavy load pallet fork comprising a screw rod, which is characterized in that: the device comprises an amplitude-variable driving assembly (1), a bidirectional rotary screw rod assembly (2) connected with the amplitude-variable driving assembly (1) through transmission, and a fork assembly (3) connected with the bidirectional rotary screw rod assembly (2) through transmission;

the amplitude-variable driving assembly (1) comprises an amplitude-variable driving motor (11);

the bidirectional rotary screw rod assembly (2) comprises a left-handed screw rod (21) with left-handed threads, a right-handed screw rod (22) with right-handed threads, a left-handed nut (23) in matched connection with the left-handed screw rod (21) and a right-handed nut (24) in matched connection with the right-handed screw rod (22), wherein the left-handed screw rod (21) and the right-handed screw rod (22) are fixedly connected, and the outer end of the left-handed screw rod (21) or the outer end of the right-handed screw rod (22) is connected with an amplitude variable driving motor (11) through transmission;

The fork assembly (3) comprises a first telescopic fork (31) and a second telescopic fork (32), the first telescopic fork (31) and the second telescopic fork (32) are in vertical relation with the bidirectional rotary screw rod assembly (2), the first telescopic fork (31) is arranged above the left-handed nut (23), the first telescopic fork (31) is connected with the left-handed nut (23), the second telescopic fork (32) is arranged above the right-handed nut (24), and the second telescopic fork (32) is connected with the right-handed nut (24).

2. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 1, wherein: the fork assembly (3) further comprises a fork telescopic driving motor (33) and a connecting rod (34), one end of the connecting rod (34) is connected to the fork telescopic driving motor (33), and the other end of the connecting rod (34) sequentially passes through the first telescopic fork (31) and the second telescopic fork (32).

3. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 1, wherein: the thread length of the left-handed section screw rod (21) is the same as the thread length of the right-handed section screw rod (22).

4. A bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 3, wherein: the screw thread shape of the left-handed section screw rod (21) is 30-degree trapezoid, and the screw thread shape of the right-handed section screw rod (22) is 30-degree trapezoid.

5. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 2, wherein: the device further comprises a first outer fixing piece (51), a first inner fixing piece (52), a second outer fixing piece (53) and a second inner fixing piece (54);

the first outer side fixing piece (51) is connected with one end of the left-handed nut (23) in a matched mode, the first inner side fixing piece (52) is connected with the other end of the left-handed nut (23) in a matched mode, and the first telescopic fork (31) is located between the first outer side fixing piece (51) and the first inner side fixing piece (52);

the second outer side fixing piece (53) is connected with one end of the right-handed nut (24) in a matched mode, the second inner side fixing piece (54) is connected with the other end of the right-handed nut (24) in a matched mode, and the second telescopic fork (32) is located between the second outer side fixing piece (53) and the second inner side fixing piece (54).

6. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 5, wherein: the first outer fixing piece (51), the first inner fixing piece (52), the second outer fixing piece (53) and the second inner fixing piece (54) comprise through holes, the first outer fixing piece (51) is connected with one end of the left-handed nut (23) in a matched mode through the through holes, and the first inner fixing piece (52) is connected with the other end of the left-handed nut (23) in a matched mode through the through holes; the second outer fixing piece (53) is connected with one end of the right-handed nut (24) in a matching way through the through hole, and the second inner fixing piece (54) is connected with the other end of the right-handed nut (24) in a matching way through the through hole.

7. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 5, wherein: the first telescopic fork (31) comprises a first fixed fork arm (311), a first middle fork arm (312) which is positioned above the first fixed fork arm (311) and is in sliding connection with the first fixed fork arm (311), and a first front fork arm (313) which is positioned above the first middle fork arm (312) and is in sliding connection with the first middle fork arm (312); the second telescopic fork (32) comprises a second fixed fork arm (321), a second middle fork arm (322) which is positioned above the second fixed fork arm (321) and is in sliding connection with the second fixed fork arm (321), and a second front fork arm (323) which is positioned above the second middle fork arm (322) and is in sliding connection with the second middle fork arm (322);

the fixed yoke (311) below of first is equipped with the first through-hole with connecting rod (34) complex, fixed yoke (321) below of second is equipped with the second through-hole with connecting rod (34), connecting rod (34) loop through the first through-hole of fixed yoke (311) below and the second through-hole of fixed yoke (321) below of second.

8. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 7, wherein: the bidirectional rotary screw rod assembly comprises a bidirectional rotary screw rod assembly (2), a first linear guide rail (61) and a second linear guide rail (62), wherein the bidirectional rotary screw rod assembly (2) is arranged between the first linear guide rail (61) and the second linear guide rail (62), and the first linear guide rail (61) and the second linear guide rail (62) are in parallel relation with the bidirectional rotary screw rod assembly (2);

One end of the first fixed fork arm (311) is movably connected with the first linear guide rail (61), and the other end of the first fixed fork arm (311) is movably connected with the second linear guide rail (62); one end of the second fixed fork arm (321) is movably connected with the first linear guide rail (61), and the other end of the second fixed fork arm (321) is movably connected with the second linear guide rail (62).

9. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 8, wherein: the bidirectional rotary screw rod assembly (2) is positioned at the middle position between the first linear guide rail (61) and the second linear guide rail (62).

10. The bi-directional luffing heavy load pallet fork comprising a lead screw as recited in claim 1, wherein: the lower part of the amplitude-variable driving motor (11) is provided with a connecting through hole, and the outer end of the left-handed section screw rod (21) or the outer end of the right-handed section screw rod (22) is directly connected with the connecting through hole of the amplitude-variable driving motor (11).