Double-extending-position forklift
By designing a mobile support frame that moves forward synchronously with the fork assembly and using support wheels and limit bars in a double-extension forklift, the problem of tipping due to forward shift of the center of gravity is solved, achieving stable handling and energy-saving effects without the need for counterweights.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-31
AI Technical Summary
Existing double-reach forklifts are prone to tipping over when handling heavy loads due to the forward shift of the center of gravity, and counterweights are required to solve this problem, which increases costs.
The moving bracket and fork assembly move forward synchronously, supported by the support wheels on the front of the moving bracket, and the limit strips restrict the limit wheels to prevent tipping caused by the forward shift of the center of gravity, eliminating the need for counterweights.
This effectively prevents double-reach forklifts from tipping over due to the forward shift of the center of gravity, reducing costs, while also lightening the forklift's weight and lowering energy consumption.
Smart Images
Figure CN224062373U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of logistics and warehousing technology, and in particular to a double-extension forklift. Background Technology
[0002] Smart warehousing is a link in the logistics process. Its application ensures the speed and accuracy of data input at every stage of warehouse management, enabling businesses to grasp real-time inventory data and rationally maintain and control inventory levels. Through scientific coding, it also facilitates the management of batches, expiration dates, and other information related to inventory.
[0003] Intelligent forklifts are widely used in warehousing and logistics for transporting and handling goods. Existing intelligent warehousing systems typically involve setting up multiple racks within the warehouse. Goods are placed on these racks via pallets, and forklifts use their forks to lift the pallets containing goods, moving them to their destination. A lifting mechanism then uses the forks to raise and lower the pallets, placing them at different storage locations on the racks. Currently, to increase storage density, multiple storage locations are often set up longitudinally on the racks, using double-reach forklifts to handle the goods.
[0004] However, existing double-reach forklifts have the following drawbacks: when a double-reach forklift is used to transport heavy goods by telescopic forks, the forward extension of the telescopic forks carrying the heavy goods will cause the center of gravity to shift forward, making the double-reach forklift risky to tip over. Existing double-reach forklifts generally use counterweights at the rear of the vehicle to solve the problem of the center of gravity shifting forward, but using counterweights increases costs. Summary of the Invention
[0005] To solve the above-mentioned technical problems, this utility model provides a double-extension forklift, in which the movable support and fork assembly move forward synchronously when transporting goods on the shelf. The forklift is supported by the support wheel on the front side of the movable support and the limit wheel connected to the movable support is restricted by the limit strip, thereby preventing the double-extension forklift from tipping over due to the forward shift of the center of gravity. There is no need to set up a counterweight, which reduces costs.
[0006] To solve the above problems, the present invention adopts the following technical solution:
[0007] This utility model discloses a double-extension forklift, including a base plate, a moving mechanism at the bottom of the base plate, a base at the top of the base plate, a moving bracket and a driving mechanism for driving the moving bracket to move back and forth above the base, a support mechanism at the front of the moving bracket, and a connecting plate arranged in a left-right direction, a first support block and two second support blocks arranged on the front side of the connecting plate, the two second support blocks being symmetrically arranged on the left and right sides of the first support block, the first support block and the second support blocks being perpendicular to the connecting plate, a limiting strip arranged in a front-back direction being provided on the inner side of the second support block, a limiting wheel being provided below the limiting strip, the limiting wheel being rotatably connected to the moving bracket through a connecting member, a fork assembly and a lifting mechanism on the moving bracket, the fork assembly including a front-back telescopic mechanism and a fork structure, the fork structure being connected to the telescopic end at the front of the front-back telescopic mechanism, and the lifting mechanism being used to drive the front-back telescopic mechanism to lift.
[0008] In this solution, the double-reach forklift moves to the corresponding rack via a moving mechanism, and the lifting mechanism raises and lowers the fork assembly. When goods need to be moved from the outer storage location on the rack, the moving bracket moves forward, causing the fork assembly to move forward synchronously. The fork assembly moves forward and inserts into the bracket under the goods in the outer storage location, thus enabling the movement. The support mechanism at the front of the moving bracket contacts the ground to provide support and prevent the double-reach forklift from tipping over due to the forward shift of its center of gravity. When goods need to be moved from the inner storage positions on the rack, the moving bracket moves forward first, driving the fork assembly to move forward synchronously. The moving bracket stops after reaching its front limit position. Then, the front and rear telescopic mechanisms drive the fork structure to extend forward and insert into the bracket under the goods in the inner storage position, thereby carrying out the transport. The support mechanism at the front of the moving bracket contacts the ground to provide support. Because the fork structure extends forward a lot, the moving bracket is prone to tilting forward when the goods are heavy. Since the limit wheel connected to the rotating part of the moving bracket is located below the limit strip, the limit strip acts as a stop for the limit wheel, preventing the moving bracket from tilting forward, thereby avoiding the double-extension forklift from tipping over due to the forward shift of the center of gravity.
[0009] This solution provides support by having the forward-moving support mechanism contact the ground, and uses limit strips to restrict the rotation of the limit wheels connected to the moving bracket, preventing the double-reach forklift from tipping over due to the forward shift of the center of gravity. It eliminates the need for counterweights, reducing costs. The absence of counterweights also reduces the weight of the double-reach forklift and decreases energy consumption.
[0010] Preferably, the movable support includes a first support bar and two second support bars. The first support bar is arranged along a left-right direction, and the two second support bars are symmetrically arranged at the left and right ends of the first support bar. The rear end of the second support bar is connected to the first support bar. The second support bar and the first support bar are perpendicular to each other. The two second support bars are respectively located above two second support blocks. The support mechanism includes two symmetrically arranged support structures. The two support structures are respectively arranged at the front end of the two second support bars. The support structure includes a vertically arranged support plate and a first support wheel arranged at the bottom of the support plate. The front end of the second support block is provided with a notch for accommodating the support structure.
[0011] Preferably, the driving mechanism includes a first driving wheel disposed at the bottom of the first support bar and a first driving motor for driving the first driving wheel to rotate. The first driving wheel is located above the first support block and can roll back and forth along the top surface of the first support block. A second support wheel is provided on the outer side of the second support bar. A guide seat is provided on the top surface of the second support block at a position corresponding to the second support wheel. The guide seat is in the shape of a right trapezoid and includes a rectangular part and a triangular part. The triangular part is located on the front side of the rectangular part, and the second support wheel is located above the rectangular part of the corresponding guide seat.
[0012] Preferably, when the first drive wheel rolls forward to its front limit position, the second support wheel does not contact the guide seat, the limit wheel does not contact the limit strip, and the first support wheel contacts the ground for support; when the first drive wheel rolls backward to its rear limit position, the second support wheel is located on the corresponding rectangular part and contacts the rectangular part for support, the limit wheel contacts the limit strip, and the first support wheel does not contact the ground.
[0013] When the first drive motor drives the first drive wheel forward, the two second support bars of the moving bracket extend forward, driving the second support wheels and support structure on the second support bars to move forward. When the first drive wheel moves forward to its front limit position, the second support wheel moves forward to a position where it no longer contacts the guide seat, meaning the second support wheel has descended a certain height. The first support wheel descends synchronously to contact the ground, providing support force. When the first drive wheel moves backward to its rear limit position, the second support wheel moves backward to the rectangular part of the guide seat, meaning the second support wheel rises a certain height. The first support wheel rises synchronously to a certain height to no longer contact the ground, thus preventing the first support wheel from generating resistance when the moving mechanism moves. When the first drive wheel moves backward to its rear limit position, the distance between the first support wheel and the ground is 1-3 cm.
[0014] Preferably, the bottom of the first support bar is provided with two first auxiliary wheels. The first auxiliary wheels are rotatably connected to the first support bar. The two first auxiliary wheels are symmetrically arranged on the left and right sides of the first drive wheel. The two first auxiliary wheels are respectively located above the two second support blocks. When the second support wheel moves forward to the point where it does not contact the guide seat, the first auxiliary wheel contacts the corresponding second support block and can roll back and forth along the top face of the corresponding second support block.
[0015] Preferably, a second auxiliary wheel is provided at the inner rear end of the second support bar. The second auxiliary wheel is rotatably connected to the second support bar. When the second support wheel moves forward to the point where it does not contact the guide seat, the second auxiliary wheel contacts the corresponding second support block and can roll back and forth along the top face of the corresponding second support block.
[0016] Preferably, roller groups are symmetrically arranged on the left and right sides of the first support block. The roller groups include multiple rollers that contact the first support block. The rollers are horizontally arranged and can roll back and forth along the first support block. The rollers are rotatably connected to the bottom of the first support bar.
[0017] The roller assembly includes multiple rollers arranged in a straight line along the front-to-back direction. Two roller assemblies clamp the first support block, serving as a limiting and guiding function.
[0018] Preferably, the fork structure includes a vertically arranged vertical plate and two horizontal plates arranged at the bottom of the vertical plate. The horizontal plates are arranged horizontally along the front-to-back direction, and the space between the first support block and the second support block is used for the horizontal plates to pass through.
[0019] The front end of the horizontal plate does not exceed the front end of the first support wheel, that is, the front end of the horizontal plate is located behind the front end of the first support wheel.
[0020] Preferably, the front and rear telescopic mechanism includes a drive module, a telescopic module, a first transmission module, and a second transmission module. The drive module includes a support base and a third drive motor mounted on the support base. The first transmission module is mounted on the front side of the support base, and the second transmission module is mounted on the rear side of the vertical plate. The telescopic module includes telescopic structures arranged symmetrically on the left and right sides. The telescopic structure includes a first rotating arm group and a second rotating arm. The first rotating arm group includes two first rotating arms arranged side by side, one above the other. The second rotating arm is located between the two first rotating arms. The rear end of the first rotating arm is connected to the first transmission module. The rear end of the second rotating arm is rotatably connected to the front end of the two first rotating arms via a rotating shaft. The front end of the second rotating arm is connected to the second transmission module. The third drive motor drives the two first rotating arm groups to rotate synchronously in opposite directions via the first transmission module. The second transmission module is used to make the two second rotating arms rotate synchronously in opposite directions.
[0021] The third drive motor drives the two first rotating arm groups to rotate outward synchronously through the first transmission module. The two first rotating arm groups drive the second rotating arm on the same side to rotate outward, thereby causing the fork structure to move and retract towards the support seat. The third drive motor also drives the two first rotating arm groups to rotate inward synchronously through the first transmission module. The two first rotating arm groups drive the second rotating arm on the same side to rotate inward, thereby causing the fork structure to extend away from the support seat.
[0022] Preferably, the first transmission module includes a first mounting base disposed on the front side of the support base. The first mounting base has symmetrical first notch groups on its left and right sides. The first notch groups include two first notches arranged symmetrically vertically. The first mounting base also has symmetrical first transmission rods on its left and right sides. The first transmission rods are vertically arranged and rotatably connected to the first mounting base. The first transmission rods pass through the two first notches on the same side. The rear ends of the two first rotating arms of the first rotating arm group are respectively located in the two first notches on the same side and are fixedly connected to the first transmission rods on the same side. The top of the first transmission rod extends upward out of the first mounting base and is coaxially mounted with a first gear. Two second gears are disposed between the two first gears. The second gears are rotatably connected to the first mounting base. The two first gears and the two second gears mesh sequentially from left to right. The third drive motor is used to drive one of the first transmission rods to rotate.
[0023] The second transmission module includes a second mounting base. The second mounting base has symmetrical second notches on its left and right sides. The second transmission rods are also symmetrically arranged on the left and right sides of the second mounting base. The second transmission rods are vertically arranged and rotatably connected to the second mounting base. The second transmission rods pass through the second notches on the same side. The front end of the second rotating arm is located in the second notches on the same side and is fixedly connected to the second transmission rods on the same side. The top of the second transmission rod extends upward out of the second mounting base and is coaxially mounted with a third gear. Two fourth gears are arranged between the two third gears. The fourth gears are rotatably connected to the second mounting base. The two third gears and the two fourth gears mesh sequentially from left to right.
[0024] The first and third gears are the same size, and the second and fourth gears are the same size. The first transmission rod passes through the rear end of the first rotating arm, and the second transmission rod passes through the front end of the second rotating arm. The rotating shaft passes through the rear end of the second rotating arm and is fixedly connected to the second rotating arm. The upper and lower ends of the rotating shaft are respectively rotatably connected to the front end of the first rotating arm on the same side.
[0025] Preferably, a camera is provided in the center of the bottom surface of the base plate, and the moving mechanism includes four omnidirectional wheels and two drive components. The four omnidirectional wheels are respectively located at the four corners of the bottom surface of the base plate, and the two drive components are symmetrically arranged on the front and rear sides of the bottom surface of the base plate. Each drive component includes a second drive wheel and a second drive motor for driving the second drive wheel to rotate. The second drive wheel is arranged in a left-right direction.
[0026] The second drive wheel is perpendicular to the first support wheel. The second drive wheel is oriented laterally to facilitate the lateral movement of the double-reach forklift. The camera is used to identify the movement path when the double-reach forklift is moving.
[0027] Preferably, the lifting mechanism includes a fixed gantry, a lifting gantry, a lifting cylinder assembly, and multiple lifting components. The fixed gantry includes columns symmetrically arranged on the top of the first support bar and a connecting beam connecting the tops of the two columns. The lifting gantry includes support columns symmetrically arranged on the left and right and a crossbeam connecting the tops of the two support columns. The support columns are located inside the corresponding column and can move up and down along the corresponding column. The lifting components include guide wheels and chains. The guide wheels are located at the bottom of the crossbeam. The front end of the chain is connected to the front and rear telescopic mechanisms, and the rear end of the chain passes around the guide wheels and connects to the connecting beam. The inner side of the support column is vertically provided with a guide groove. The rear end of the front and rear telescopic mechanisms is provided with rolling wheels that can roll along the guide groove at positions corresponding to the guide groove. The lifting cylinder assembly includes lifting cylinders symmetrically arranged on the left and right. The bottom of the lifting cylinder is fixedly connected to the first support bar, and the lifting end at the top of the lifting cylinder is fixedly connected to the bottom of the crossbeam.
[0028] The lifting cylinder drives the crossbeam to rise, which in turn drives the guide wheel to rise. The front end of the chain moves upward, causing the fork extension and retraction mechanism to rise.
[0029] Preferably, a third support strip is provided on the outer side of the column. The third support strip is inclined upward from front to back. The front end of the third support strip is connected to the second support strip on the corresponding side, and the rear end of the third support strip is connected to the column.
[0030] The third support bar is used to strengthen the column, reduce the stress on the column, and prevent the column from bending and deforming when a double-extension forklift is handling heavy goods.
[0031] The beneficial effects of this utility model are: (1) When moving goods on the shelf, the moving bracket and the fork assembly move forward synchronously. The moving bracket is supported by the support wheel on the front side and the limit wheel connected to the moving bracket is restricted by the limit strip, thereby preventing the double-extend forklift from tipping over due to the forward shift of the center of gravity. There is no need to set a counterweight, which reduces costs. At the same time, the weight of the warehouse forklift is reduced, thereby reducing power consumption. (2) When the moving bracket extends forward from the base, the first support wheel contacts the ground and provides support force. When the moving bracket retracts backward from the base, the first support wheel does not contact the ground and does not generate resistance, which facilitates the movement of the double-extend forklift. Attached Figure Description
[0032] Figure 1 This is a structural schematic diagram of the double-extension forklift in Example 1;
[0033] Figure 2 yes Figure 1 Enlarged view of section A;
[0034] Figure 3 yes Figure 1 Side view;
[0035] Figure 4 This is a schematic diagram of the internal structure of the rear side of a double-reach forklift;
[0036] Figure 5 yes Figure 4 A front-view diagram;
[0037] Figure 6 This is a schematic diagram of the limiting wheel and roller assembly in Example 1;
[0038] Figure 7 yes Figure 6 Rear view diagram;
[0039] Figure 8 This is a schematic diagram of the moving mechanism;
[0040] Figure 9 This is a schematic diagram of the movable support when it is moved to its front limit position;
[0041] Figure 10 This is a schematic diagram of goods being handled in the inner storage compartments of a double-reach forklift rack.
[0042] Figure 11 This is a schematic diagram of the fork assembly in Embodiment 2;
[0043] Figure 12 This is a schematic diagram of the rear structure of the fork assembly in Embodiment 2;
[0044] Figure 13 This is a schematic diagram of the fork assembly in the retracted state in Embodiment 2.
[0045] In the diagram: 1. Base plate, 2. Base, 3. Movable bracket, 4. Connecting plate, 5. First support block, 6. Second support block, 7. Limiting strip, 8. Limiting wheel, 9. Connecting piece, 10. Fork assembly, 11. Lifting mechanism, 12. Front and rear telescopic mechanism, 13. Fork structure, 14. First support strip, 15. Second support strip, 16. Support plate, 17. First support wheel, 18. Notch, 19. First drive wheel, 20. First drive motor, 21. Second support wheel, 22. Guide seat, 23. Rectangular part, 24. Triangular part, 25. First auxiliary wheel, 26. Second auxiliary wheel, 27. Roller, 28. Vertical plate, 29. Horizontal plate, 30. Support seat, 31. 31. Third drive motor; 32. First rotating arm; 33. Second rotating arm; 34. First mounting base; 35. First notch; 36. First transmission rod; 37. First gear; 38. Second gear; 39. Second mounting base; 40. Second notch; 41. Second transmission rod; 42. Third gear; 43. Fourth gear; 44. Camera; 45. Caster wheel; 46. Second drive wheel; 47. Second drive motor; 48. Column; 49. Connecting beam; 50. Support column; 51. Crossbeam; 52. Guide wheel; 53. Chain; 54. Guide groove; 55. Rolling wheel; 56. Lifting cylinder; 57. Third support bar; 58. Shelf; 59. Goods; 60. Bracket. Detailed Implementation
[0046] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
[0047] Example 1: A double-extension forklift of this example, such as Figures 1 to 9 As shown, the system includes a base plate 1, a moving mechanism at the bottom of the base plate 1, an E-shaped base 2 at the top of the base plate 1, a moving bracket 3 and a driving mechanism for moving the moving bracket 3 back and forth above the base 2, a support mechanism at the front of the moving bracket 3, and a connecting plate 4 arranged in a left-right direction, a first support block 5 and two second support blocks 6 arranged on the front side of the connecting plate 4. The two second support blocks 6 are symmetrically arranged on the left and right sides of the first support block 5. The first support block 5 and the second support blocks 6 are both perpendicular to the connecting plate 4. A limiting strip 7 is provided on the inner side of the second support block 6, and a limiting wheel 8 is provided below the limiting strip 7. The limiting wheel 8 is rotatably connected to the moving bracket 3 through a connecting piece 9. The moving bracket 3 is provided with a fork assembly 10 and a lifting mechanism 11. The fork assembly 10 includes a front and rear telescopic mechanism 12 and a fork structure 13. The fork structure 13 is connected to the telescopic end at the front of the front and rear telescopic mechanism 12. The lifting mechanism 11 is used to drive the front and rear telescopic mechanism 12 to lift.
[0048] The movable support 3 includes a first support bar 14 and two second support bars 15. The first support bar 14 is arranged along a left-right direction, and the two second support bars 15 are symmetrically arranged at the left and right ends of the first support bar 14. The rear ends of the second support bars 15 are connected to the first support bar 14, and the second support bars 15 and the first support bar 14 are perpendicular to each other. The two second support bars 15 are respectively located above two second support blocks 6. The support mechanism includes two symmetrically arranged support structures, which are respectively located at the front ends of the two second support bars 15. The support structure includes a vertically arranged support plate 16 and a first support wheel 17 located at the bottom of the support plate 16. The first support wheel 17 is rotatably connected to the support plate 16. The front end of the second support block 6 has a notch 18 for accommodating the support structure, and the bottom plate 1 has an opening corresponding to the notch 18 for the support structure to pass through. The limiting wheel 8 is rotatably connected to the first support bar 14 through a connector 9.
[0049] The driving mechanism includes a first drive wheel 19 located at the bottom of the first support bar 14 and a first drive motor 20 for driving the first drive wheel 19 to rotate. The first drive wheel 19 is located above the first support block 5 and can roll back and forth along the top surface of the first support block 5. A second support wheel 21 is provided on the outer side of the second support bar 15. The second support wheel 21 is rotatably connected to the second support bar 15. A guide seat 22 is provided on the top surface of the second support block 6 at a position corresponding to the second support wheel 21. The guide seat 22 is a right trapezoid and includes a rectangular part 23 and a triangular part 24. The triangular part 24 is located in front of the rectangular part 23. The second support wheel 21 is located above the rectangular part 23 of the corresponding guide seat 22.
[0050] When the first drive wheel 19 rolls forward to the front limit position, the second support wheel 21 does not contact the guide seat 22, the limit wheel 8 does not contact the limit strip 7, and the first support wheel 17 contacts the ground for support; when the first drive wheel 19 rolls backward to the rear limit position, the second support wheel 21 is located on the corresponding rectangular part 23 and contacts the rectangular part 23 for support, the limit wheel 8 contacts the limit strip 7, and the first support wheel 17 does not contact the ground.
[0051] When the first drive motor drives the first drive wheel forward, the two second support bars of the moving bracket extend forward, driving the second support wheels and support structure on the second support bars to move forward. When the first drive wheel moves forward to its front limit position, the second support wheel moves forward to a position where it no longer contacts the guide seat, meaning the second support wheel has descended a certain height. The first support wheel descends synchronously to contact the ground, providing support force. When the first drive wheel moves backward to its rear limit position, the second support wheel moves backward to the rectangular part of the guide seat, meaning the second support wheel rises a certain height. The first support wheel rises synchronously to a certain height to no longer contact the ground, thus preventing the first support wheel from generating resistance when the moving mechanism moves. When the first drive wheel moves backward to its rear limit position, the distance between the first support wheel and the ground is 1-3 cm.
[0052] The bottom of the first support bar 14 is provided with two first auxiliary wheels 25. The first auxiliary wheels 25 are rotatably connected to the first support bar 14. The two first auxiliary wheels 25 are symmetrically arranged on the left and right sides of the first drive wheel 19. The two first auxiliary wheels 25 are respectively located above the two second support blocks 6. When the second support wheel 21 moves forward to the point where it does not contact the guide seat 22, the first auxiliary wheel 25 contacts the corresponding second support block 6 and can roll back and forth along the top face of the corresponding second support block 6.
[0053] The second auxiliary wheel 26 is provided at the inner rear end of the second support bar 15. The second auxiliary wheel 26 is rotatably connected to the second support bar 15. When the second support wheel 21 moves forward and does not contact the guide seat 22, the second auxiliary wheel 26 contacts the corresponding second support block 6 and can roll back and forth along the top face of the corresponding second support block 6.
[0054] The first support block 5 is symmetrically provided with roller sets on its left and right sides. Each roller set includes multiple rollers 27 arranged in a straight line along the front-back direction. The rollers 27 are in contact with the first support block 5, are horizontally positioned, and can roll back and forth along the first support block 5. The rollers 27 are rotatably connected to the bottom of the first support bar 14. The two roller sets clamp the first support block, serving as a limiting and guiding function.
[0055] The fork structure 13 includes a vertically arranged vertical plate 28 and two horizontal plates 29 arranged at the bottom of the vertical plate 28. The horizontal plates 29 are arranged horizontally along the front-back direction. The space between the first support block 5 and the second support block 6 is used for the horizontal plates 29 to pass through. The foremost point of the horizontal plate 29 does not exceed the foremost point of the first support wheel 17, that is, the foremost point of the horizontal plate 29 is located behind the foremost point of the first support wheel 17.
[0056] A camera 44 is provided in the center of the bottom surface of the base plate 1. The moving mechanism includes four universal wheels 45 and two drive components. The four universal wheels 45 are respectively located at the four corners of the bottom surface of the base plate 1. The two drive components are symmetrically arranged on the front and rear sides of the bottom surface of the base plate 1. The drive components include a second drive wheel 46 and a second drive motor 47 for driving the second drive wheel 46 to rotate. The second drive wheel 46 is arranged in a left-right direction.
[0057] The second drive wheel is oriented left-right to facilitate lateral movement of the double-reach forklift in front of the rack. A camera is used to identify the movement path as the forklift moves. The first support wheel is oriented front-back, and the second drive wheel is oriented left-right. The second drive wheel is perpendicular to the first support wheel. When the double-reach forklift is moving normally, the first drive wheel is at its rearmost position, the moving bracket is not extended forward, the second support wheel is located on the rectangular part of the guide seat, and the first support wheel does not contact the ground, thus generating no resistance.
[0058] In this design, the front and rear telescopic mechanisms employ a scissor fork structure. The double-extension forklift moves to the corresponding rack via a moving mechanism, and the lifting mechanism raises and lowers the fork assembly. When goods need to be moved from the outer storage location on the rack, the moving support moves forward, causing the fork assembly to move forward synchronously. The fork structure moves forward and inserts into the bracket under the goods in the outer storage location, thus facilitating the movement. The support mechanism at the front of the moving support contacts the ground to provide support and prevent the double-extension forklift from tipping over due to the forward shift of its center of gravity.
[0059] like Figure 10 As shown, when goods 59 on the inner storage position of the rack 58 need to be moved, the moving bracket moves forward first, driving the fork assembly to move forward synchronously. The moving bracket stops after reaching its front limit position. Then, the front and rear telescopic mechanism drives the fork structure to extend forward and insert into the bracket 60 under the goods in the inner storage position, thereby carrying out the transport. The support mechanism on the front side of the moving bracket contacts the ground to provide support. Because the fork structure extends forward a lot, the moving bracket is prone to tilting forward when the goods are heavy. Since the limit wheel connected to the moving bracket is located below the limit strip, the limit strip acts as a stop for the limit wheel, preventing the moving bracket from tilting forward, thereby avoiding the double-extension forklift from tipping over due to the forward shift of the center of gravity. When the first drive wheel rolls forward to the front limit position, the second support wheel does not contact the guide seat, and the distance between the limit wheel and the limit strip can be equal to the height of the rectangular part. After the fork structure picks up the goods on the shelf, the front and rear telescopic mechanism drives the fork structure to retract backward, the moving bracket moves to the rear limit position, the support structure retracts into the corresponding notch, the second support wheel moves backward onto the rectangular part of the guide seat, and the first support wheel rises synchronously to a certain height without contacting the ground, so that the first support wheel will not generate resistance when the moving mechanism moves.
[0060] This solution provides support by having the forward-moving support mechanism contact the ground, and uses limit strips to restrict the rotation of the limit wheels connected to the moving bracket, preventing the double-reach forklift from tipping over due to the forward shift of the center of gravity. It eliminates the need for counterweights, reducing costs. The absence of counterweights also reduces the weight of the double-reach forklift and decreases energy consumption.
[0061] The lifting mechanism 11 includes a fixed gantry, a lifting gantry, a lifting cylinder assembly, and multiple lifting components. The fixed gantry includes columns 48 symmetrically arranged on the top of the first support bar 14 and a connecting beam 49 connecting the tops of the two columns 48. The lifting gantry includes support columns 50 symmetrically arranged on the left and right and a crossbeam 51 connecting the tops of the two support columns 50. The support columns 50 are located inside the corresponding column 48 and can move up and down along the corresponding column 48. The lifting components include guide wheels 52 and chains 53. 2. A chain 53 is installed at the bottom of the crossbeam 51. The front end of the chain 53 is connected to the front and rear telescopic mechanism 12, and the rear end of the chain 53 passes around the guide wheel 52 and connects to the connecting beam 49. A guide groove 54 is vertically provided on the inner side of the support column 50. A rolling wheel 55 that can roll along the guide groove 54 is provided at the corresponding position of the rear end of the front and rear telescopic mechanism 12. The lifting cylinder assembly includes lifting cylinders 56 arranged symmetrically on the left and right. The bottom of the lifting cylinder 56 is fixedly connected to the first support bar 14, and the lifting end of the top of the lifting cylinder 56 is fixedly connected to the bottom of the crossbeam 51. The lifting cylinder drives the crossbeam to rise, which drives the guide wheel to rise. The front end of the chain moves upward, which drives the front and rear telescopic mechanism of the forks to rise.
[0062] A third support strip 57 is provided on the outer side of the column 48. The third support strip 57 slopes upward from front to back. The front end of the third support strip 57 is connected to the second support strip 15 on the corresponding side, and the rear end of the third support strip 57 is connected to the column 48. The third support strip is used to strengthen the column, reduce the stress on the column, and prevent the column from bending and deforming when a double-extension forklift is handling heavy goods.
[0063] Example 2: A double-extension forklift in this example. The front and rear telescopic mechanisms in this example are different from those in Example 1, but the rest of the structure is the same as in Example 1.
[0064] like Figures 11 to 13As shown, the front and rear telescopic mechanism includes a drive module, a telescopic module, a first transmission module, and a second transmission module. The drive module includes a support base 30 and a third drive motor 31 mounted on the support base 30. The first transmission module is mounted on the front side of the support base 30, and the second transmission module is mounted on the rear side of the vertical plate 28. The telescopic module includes telescopic structures arranged symmetrically on the left and right sides. The telescopic structure includes a first rotating arm group and a second rotating arm 33. The first rotating arm group includes two first rotating arms 32 arranged side by side, one above the other. The second rotating arm 33 is located between the two first rotating arms 32. The rear end of the first rotating arm 32 is connected to the first transmission module. The rear end of the second rotating arm 33 is rotatably connected to the front end of the two first rotating arms 32 via a rotating shaft. The front end of the second rotating arm 33 is connected to the second transmission module. The third drive motor 31 drives the two first rotating arm groups to rotate synchronously in opposite directions through the first transmission module. The second transmission module is used to make the two second rotating arms 33 rotate synchronously in opposite directions.
[0065] The first transmission module includes a first mounting base 34 disposed on the front side of the support base 30. The first mounting base 34 has symmetrical first notch groups on its left and right sides. The first notch groups include two first notches 35 symmetrically arranged vertically. The first mounting base 34 also has symmetrical first transmission rods 36 on its left and right sides. The first transmission rods 36 are vertically arranged and rotatably connected to the first mounting base 34. The first transmission rods 36 pass through the two first notches 35 on the same side. The rear ends of the two first rotating arms 32 of the first rotating arm group are respectively located in the two first notches 35 on the same side and are fixedly connected to the first transmission rods 36 on the same side. The top of the first transmission rods 36 extends upward out of the first mounting base 34 and is coaxially mounted with a first gear 37. Two second gears 38 are provided between the two first gears 37. The second gears 38 are rotatably connected to the first mounting base 34. The two first gears 37 and the two second gears 38 mesh sequentially from left to right. The third drive motor 31 is used to drive one of the first transmission rods 36 to rotate.
[0066] The second transmission module includes a second mounting base 39. The second mounting base 39 has symmetrical second notches 40 on its left and right sides. The second mounting base 39 also has symmetrical second transmission rods 41 on its left and right sides. The second transmission rods 41 are vertically arranged and rotatably connected to the second mounting base 39. The second transmission rods 41 pass through the second notches 40 on the same side. The front end of the second rotating arm 33 is located in the second notches 40 on the same side and is fixedly connected to the second transmission rods 41 on the same side. The top of the second transmission rods 41 extends upward out of the second mounting base 39 and is coaxially mounted with a third gear 42. Two fourth gears 43 are arranged between the two third gears 42. The fourth gears 43 are rotatably connected to the second mounting base 39. The two third gears 42 and the two fourth gears 43 mesh sequentially from left to right.
[0067] The first and third gears are the same size, and the second and fourth gears are the same size. The first transmission rod passes through the rear end of the first rotating arm, and the second transmission rod passes through the front end of the second rotating arm. The rotating shaft passes through the rear end of the second rotating arm and is fixedly connected to the second rotating arm. The upper and lower ends of the rotating shaft are respectively rotatably connected to the front end of the first rotating arm on the same side.
[0068] In this design, when the fork structure needs to retract, the third drive motor drives the left first transmission rod to rotate forward. The first transmission rod drives the first gear on it to rotate forward. The first gear drives the right first gear to rotate in reverse through the two middle second gears, which in turn drives the right first transmission rod to rotate in reverse. This drives the two first rotating arm assemblies to rotate outward synchronously. The two first rotating arm assemblies drive the second rotating arms on the same side to rotate outward. The two second rotating arms drive the two second transmission rods to rotate in the opposite direction, causing the two third gears to rotate in the opposite direction. The two third gears then achieve synchronous reverse rotation through the two middle fourth gears, causing the fork structure to retract.
[0069] When the fork structure needs to extend forward, the third drive motor drives the left first transmission rod to reverse, which in turn drives the first gear on it to reverse. The first gear then drives the right first gear to rotate forward through the two middle second gears, which in turn drives the right first transmission rod to rotate forward. This drives the two first rotating arm assemblies to rotate inward synchronously. The two first rotating arm assemblies then drive the second rotating arm on the same side to rotate inward. Under the action of the two third gears and the two fourth gears, the two second rotating arms rotate inward synchronously, thus allowing the fork structure to extend forward.
[0070] Existing forklifts typically use scissor forks for extending and retracting the forks, which have weak load-bearing capacity and cannot handle heavy loads. This proposed solution features a front and rear extension mechanism with strong load-bearing capacity, enabling the handling of heavier goods.
Claims
1. A double reach fork truck characterized by, The utility model provides a kind of movable support (3), it includes first support bar (14) and two second support bars (15), first support bar (14) is arranged along left and right direction, two second support bars (15) are symmetrically arranged in the left and right ends of first support bar (14), the rear end of second support bar (15) is connected with first support bar (14), second support bar (15) is perpendicular to first support bar (14), and two second support bars (15) are respectively located above two second support blocks (6), the support mechanism includes two left and right symmetrically arranged support structures, and two support structures are arranged in the front end of two second support bars (15), and the support structure includes vertically arranged support plate (16) and first support wheel (17) arranged in the bottom of support plate (16), and the front end of second support block (6) is provided with gap portion (18) for accommodating support structure.
2. The dual reach fork truck of claim 1, wherein, The drive mechanism includes first drive wheel (19) arranged in the bottom of first support bar (14) and first drive motor (20) for driving first drive wheel (19) to rotate, and the first drive wheel (19) is located above first support block (5) and can roll back and forth along the top surface of first support block (5), the outer side of second support bar (15) is provided with second support wheel (21), the top surface of second support block (6) is provided with guide seat (22) at the corresponding position of second support wheel (21), the guide seat (22) is a right-angled trapezoid, and the guide seat (22) includes rectangular portion (23) and triangular portion (24), the triangular portion (24) is located in the front side of rectangular portion (23), and the second support wheel (21) is located above the rectangular portion (23) of the corresponding guide seat (22).
3. A double reach fork truck as set forth in claim 2 wherein, 4. The dual reach fork truck of claim 3, wherein, When the first driving wheel (19) rolls forward to the front limit position, the second supporting wheel (21) is not in contact with the guide seat (22), the limiting wheel (8) is not in contact with the limiting strip (7), and the first supporting wheel (17) is in contact with the ground for support; when the first driving wheel (19) rolls backward to the rear limit position, the second supporting wheel (21) is located on the corresponding rectangular portion (23) and is in contact with the rectangular portion (23) for support, the limiting wheel (8) is in contact with the limiting strip (7), and the first supporting wheel (17) is not in contact with the ground.
5. The dual reach fork truck of claim 3, wherein, The bottom of the first supporting strip (14) is provided with two first auxiliary wheels (25), the first auxiliary wheels (25) are rotationally connected with the first supporting strip (14), the two first auxiliary wheels (25) are symmetrically arranged on the left and right sides of the first driving wheel (19), and the two first auxiliary wheels (25) are located above the two second supporting blocks (6), respectively, when the second supporting wheel (21) moves forward to be not in contact with the guide seat (22), the first auxiliary wheel (25) is in contact with the corresponding second supporting block (6) and can roll forward and backward along the top surface of the corresponding second supporting block (6).
6. The dual reach fork truck of claim 3, wherein, The inner side of the rear end of the second supporting strip (15) is provided with a second auxiliary wheel (26), the second auxiliary wheel (26) is rotationally connected with the second supporting strip (15), when the second supporting wheel (21) moves forward to be not in contact with the guide seat (22), the second auxiliary wheel (26) is in contact with the corresponding second supporting block (6) and can roll forward and backward along the top surface of the corresponding second supporting block (6).
7. The dual reach fork truck of claim 3, wherein, The left and right sides of the first supporting block (5) are symmetrically provided with a roller set, the roller set comprises a plurality of rollers (27) in contact with the first supporting block (5), the rollers (27) are horizontally arranged and can roll forward and backward along the first supporting block (5), and the rollers (27) are rotationally connected with the bottom of the first supporting strip (14).
8. The dual reach fork truck of claim 1, wherein, The fork structure (13) comprises a vertical plate (28) arranged vertically and two horizontal plates (29) arranged at the bottom of the vertical plate (28), the horizontal plates (29) are horizontally arranged along the front and rear directions, and the space between the first supporting block (5) and the second supporting block (6) is used for the horizontal plates (29) to pass through.
9. A double reach fork truck as set forth in claim 8 wherein, The front-rear telescopic mechanism (12) comprises a driving module, a telescopic module, a first transmission module and a second transmission module, the driving module comprises a support base (30) and a third driving motor (31) arranged on the support base (30), the first transmission module is arranged on the front side of the support base (30), the second transmission module is arranged on the rear side of the vertical plate (28), the telescopic module comprises telescopic structures arranged symmetrically left and right, the telescopic structures comprise a first rotary arm group and a second rotary arm (33), the first rotary arm group comprises two first rotary arms (32) arranged side by side upwards and downwards, the second rotary arm (33) is located between the two first rotary arms (32), the rear end of the first rotary arm (32) is connected with the first transmission module, the rear end of the second rotary arm (33) is rotationally connected with the front ends of the two first rotary arms (32) through a rotating shaft, and the front end of the second rotary arm (33) is connected with the second transmission module; the third driving motor (31) drives the two first rotary arm groups to rotate reversely synchronously through the first transmission module, and the second transmission module is used for synchronously rotating reversely the two second rotary arms (33).
10. The dual reach fork truck of claim 9, wherein, The first transmission module comprises a first mounting seat (34) arranged on the front side of the support base (30), first notches (35) are symmetrically arranged on the left and right sides of the first mounting seat (34), the first notches (35) comprise two first notches (35) arranged symmetrically upwards and downwards, first transmission rods (36) are also symmetrically arranged on the left and right sides of the first mounting seat (34), the first transmission rods (36) are vertically arranged and rotationally connected with the first mounting seat (34), the first transmission rods (36) pass through the two first notches (35) on the same side, the rear ends of the two first rotary arms (32) of the first rotary arm group are located in the two first notches (35) on the same side respectively and are fixedly connected with the first transmission rod (36) on the same side, the top of the first transmission rod (36) extends out of the first mounting seat (34) upwards and is coaxially provided with a first gear (37), two second gears (38) are arranged between the two first gears (37), the second gears (38) are rotationally connected with the first mounting seat (34), the two first gears (37) and the two second gears (38) are sequentially meshed from left to right, and the third driving motor (31) is used for driving one of the first transmission rods (36) to rotate. The second transmission module comprises a second mounting base (39), second notches (40) are symmetrically arranged on the left and right sides of the second mounting base (39), second transmission rods (41) are also symmetrically arranged on the left and right sides of the second mounting base (39), the second transmission rods (41) are vertically arranged and are rotationally connected with the second mounting base (39), the second transmission rods (41) pass through the same side second notches (40), the front end of the second rotary arm (33) is located in the same side second notch (40) and is fixedly connected with the same side second transmission rod (41), the top of the second transmission rod (41) extends out of the second mounting base (39) and is coaxially provided with a third gear (42), two fourth gears (43) are arranged between the two third gears (42), the fourth gears (43) are rotationally connected with the second mounting base (39), and the two third gears (42) and the two fourth gears (43) are sequentially meshed from left to right.