Engineering machinery pallet fork system and forklift
By installing a transition plate and steel pipe connection on the adjustable cylinder of the port counterbalance forklift, the dynamic interference problem between the hose and the central cylinder was solved, a safe hose distance was achieved, the design was simplified, and the development cost was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-03-06
AI Technical Summary
In the existing port counterbalance forklift fork system, the hose is prone to dynamic interference with the central cylinder when the forks are folded together, leading to structural interference and potential mechanical failures.
Install a transition plate on the pitch cylinder and connect the rod chamber ports of the two pitch cylinders through a steel pipe to widen the distance between the two ends of the hose, so as to avoid excessive bending radius of the hose and prevent interference with the central cylinder.
This effectively avoids dynamic interference between the hose and the central cylinder, maintains a safe distance between the hose and the cylinder, prevents structural interference, simplifies the design, and reduces development costs.
Smart Images
Figure CN223973829U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of port logistics machinery technology, specifically to an engineering machinery forklift system and forklift. Background Technology
[0002] With the development of modern science and technology, port logistics and transportation are moving towards greater efficiency, speed, and safety. Port counterbalance forklifts are a key transportation tool required for port logistics. Port counterbalance forklifts typically include a fork carriage with two forks for supporting goods. The two forks can be combined and separated by an adjustable cylinder to accommodate different cargo sizes. The fork carriage itself can also be moved laterally by a side-shift cylinder to load goods in different positions.
[0003] The current hydraulic piping of the forks in port counterbalance forklifts can achieve basic functions: the multi-way valve A3 port is connected to the rod-side port of the side-shift cylinder, enabling rightward movement of the forks; the multi-way valve B3 port is connected to the rodless port of the side-shift cylinder, enabling leftward movement of the forks; the multi-way valve A4 port is connected to the rod-side port of the pitch-adjusting cylinder, enabling fork merging; and the multi-way valve B4 port is connected to the rodless port of the pitch-adjusting cylinder, enabling fork separation. The rod-side port of the pitch-adjusting cylinder needs to be connected in series with a hose to ensure consistent movement. However, the fork carriage is usually part of the side-shift fork assembly, which requires a central cylinder for lifting and lowering. During the lifting and lowering process of the side-shift fork assembly, because the two pitch-adjusting cylinders have the same structure and are assembled relative to each other, when the two forks are merged, the extension and retraction ends of the two pitch-adjusting cylinders approach each other, and the distance between the rod-side ports of the two pitch-adjusting cylinders decreases (combined with...). Figure 1 As the bending radius of the hose increases, the gap between the hose and the central cylinder decreases, making it easier for the hose to dynamically interfere with the central cylinder during the movement of the two forks. Utility Model Content
[0004] The purpose of this utility model is to provide an engineering machinery fork system and forklift, which uses a steel pipe as a transition to the rod chamber port of one of the adjustable cylinders, and the rod chamber port of the other adjustable cylinder is then connected to the steel pipe through a hose. At this time, the distance between the two ends of the hose can be stretched, so that even when the two forks are combined, the two ends of the hose can still maintain a safe distance, so as to avoid the hose bending radius being too large and dynamically interfering with the central cylinder.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] In a first aspect, this utility model provides an engineering machinery forklift system, which includes:
[0007] The gantry assembly includes a central hydraulic cylinder.
[0008] A side-shift fork assembly is movably mounted on the mast assembly. The side-shift fork assembly includes a fork carriage and forks mounted on both sides of the fork carriage. The central hydraulic cylinder is capable of driving the side-shift fork assembly to move along the mast assembly.
[0009] The hydraulic system includes adjustable cylinders arranged opposite each other, the adjustable cylinders being mounted on the fork carriage, and the telescopic ends of the adjustable cylinders being connected to the forks on the corresponding sides;
[0010] The transition mechanism includes a transition plate and a steel pipe. The transition plate is installed on the pitch cylinder. The first end of the steel pipe is connected to the rod chamber port of one of the pitch cylinders, and the second end is fixed to the transition plate and connected to the rod chamber port of the other pitch cylinder via a hose.
[0011] Optionally, the base of the transition plate is fixed to the welded block of the adjusting cylinder by bolts.
[0012] Optionally, a U-shaped hole is formed on the transition plate.
[0013] Optionally, the second end of the steel pipe passes through the U-shaped hole and is fixedly connected to the transition plate through a plate joint.
[0014] Optionally, the steel pipe is a compression fitting nut type steel pipe.
[0015] Optionally, the gantry assembly includes an outer gantry and an inner gantry movably mounted on the outer gantry.
[0016] Optionally, the side shift fork assembly further includes a lifting frame, the central cylinder is mounted on the inner mast, and chains on both sides of the central cylinder are fixed to the lifting frame. When the central cylinder extends, the lifting frame moves via the chains to move the side shift fork assembly along the height direction of the inner mast.
[0017] Optionally, it also includes:
[0018] A lateral displacement cylinder is mounted on the lifting frame. The telescopic end of the lateral displacement cylinder is connected to the fork carriage and can drive the fork carriage to move laterally relative to the lifting frame.
[0019] Optionally, the gantry assembly further includes:
[0020] Lifting cylinders are located on both sides of the central cylinder, and the telescopic ends of the lifting cylinders are connected to the inner gantry.
[0021] When the central hydraulic cylinder reaches its limit stroke, the lifting hydraulic cylinder can push the inner mast and the side shift fork assembly together to move along the height direction of the outer mast.
[0022] Secondly, this utility model provides a port forklift, characterized in that it includes the aforementioned engineering machinery forklift system.
[0023] Compared with the prior art, the present invention has the following beneficial effects:
[0024] This invention first pre-arranges welding blocks for mounting transition plates on the pitch cylinder, and then installs steel pipes on the transition plates. The steel pipes can serve as a transition between the rod chamber ports of the two pitch cylinders to widen the distance between the two ends of the hose. The two ends of the hose are respectively connected to the steel pipe and the rod chamber port of one of the pitch cylinders. When the two ends of the hose are widened, the hose can still maintain a safe bending radius even when the forks are joined, so as to avoid interference with the central cylinder. Attached Figure Description
[0025] Figure 1 This is a schematic diagram illustrating the interference between the hoses and the central cylinder in the hydraulic lines of the forks in the prior art.
[0026] Figure 2 This is a schematic diagram of the forklift system in Example 1;
[0027] Figure 3 for Figure 1 Schematic diagram of the structure of the forklift;
[0028] Figure 4 This is a schematic diagram of the hydraulic system in Example 1;
[0029] Figure 5 for Figure 4 Schematic diagram of the left-right adjusting cylinder, welding block, and steel pipe;
[0030] Figure 6 for Figure 5 Schematic diagram of the structure of the welding block;
[0031] Figure 7 for Figure 5 A schematic diagram of the structure of the steel pipe.
[0032] The following are the labeling elements in the diagram: 1. Mast assembly; 101. Outer mast; 102. Inner mast; 2. Center cylinder; 3. Side shift fork assembly; 31. Fork carriage; 4. Chain; 5. Lifting cylinder; 6. Roller; 7. Transition plate; 8. Steel pipe; 9. Hose; 10. Left adjusting cylinder; 11. Right adjusting cylinder; 12. Welded block; 121. U-shaped hole; 13. Transition plate connector; 14. Rod chamber oil port of left adjusting cylinder; 15. Rod chamber oil port of right adjusting cylinder; 16. Rod chamber oil inlet of adjusting cylinder; 17. Rodless chamber oil inlet of adjusting cylinder; 18. Rod chamber oil inlet of side shift cylinder; 19. Rodless chamber oil inlet of side shift cylinder. Detailed Implementation
[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1
[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0036] Combination Figure 2 This embodiment provides a forklift system for engineering machinery, which includes a mast assembly 1, a side-shift fork assembly 3, and a hydraulic system. The mast assembly 1 contains a central hydraulic cylinder 2. The side-shift fork assembly 3 is movably mounted on the mast assembly 1, and includes a fork carriage 31 and forks mounted on both sides of the fork carriage 31. The central hydraulic cylinder 2 can drive the side-shift fork assembly 3 to move along the mast assembly 1. Figure 3 and Figure 4 The hydraulic system includes adjustable cylinders arranged opposite each other, the adjustable cylinders being mounted on the fork carriage 31, and the telescopic ends of the adjustable cylinders being connected to the corresponding forks; it is worth noting that, combined with Figures 5 to 7In this embodiment, the forklift system also includes a transition mechanism, which includes a transition plate 7 and a steel pipe 8. The transition plate 7 is mounted on the pitch-adjusting cylinder. The first end of the steel pipe 8 is connected to the rod-side port of one of the pitch-adjusting cylinders, and the second end is fixed to the transition plate 7 and connected to the rod-side port of another pitch-adjusting cylinder via a hose 9. In some of the embodiments shown in the screenshots, the base of the transition plate 7 is fixed to the welding block 12 of the pitch-adjusting cylinder by bolts. The welding position of the welding block 12 can be determined according to actual needs. Multiple welding blocks 12 are arranged at intervals on the pitch-adjusting cylinder, and the base of the transition plate (7) is fixedly connected to one of the multiple welding blocks. In the actual arrangement process, the distance between the two ends of the hose 9 does not need to be too far, for example, attached Figure 5 In this design, the welded block 12 is installed in the area near the trisection points, and a U-shaped hole 121 is formed on the transition plate 7. The second end of the steel pipe 8 passes through the U-shaped hole 121 and is fixedly connected to the transition plate 7 through the plate joint 13. The steel pipe 8 adopts a ferrule nut type, which can greatly shorten the processing cycle and reduce the processing cost compared with the welded steel pipe 8.
[0037] Specifically, in this embodiment, the rod-side ports of the two pitch-adjusting cylinders are not directly connected via hose 9. The rod-side port of one pitch-adjusting cylinder (using the left pitch-adjusting cylinder 10 as an example in this embodiment) is connected to the first end of the steel pipe 8. The second end of the steel pipe 8 is mounted on the transition plate 7. The port at the second end of the steel pipe 8 is then connected via hose 9 to the rod-side port of the other pitch-adjusting cylinder (using the right pitch-adjusting cylinder 11 as an example in this embodiment). Thus, after the transition via the second end of the steel pipe 8, both ends of the hose 9 are actually connected to the second end of the steel pipe 8 and the rod-side port of the right pitch-adjusting cylinder 11. The connection distance between the two ends of the hose 9 is increased compared to the original method. The connection positions of the rod-side port 14 of the left pitch-adjusting cylinder, the rod-side port 15 of the right pitch-adjusting cylinder, and the steel pipe 8 are shown in the attached figure. Figure 4 As shown, the rod chamber oil port 14 of the left adjusting cylinder and the rod chamber oil port 15 of the right adjusting cylinder are both connected to the rod chamber oil inlet 16 of the adjusting cylinder, and the rodless chamber oil port of the left adjusting cylinder 10 and the rodless chamber oil port of the right adjusting cylinder 11 are both connected to the rodless chamber oil inlet 17 of the adjusting cylinder.
[0038] After the transition through the steel pipe 8, even when the forks are folded to their limit position, the telescopic ends of the left and right adjustable cylinders 11 approach each other. At this time, through the transition plate 7 and the steel pipe 8, the two ends of the hose 9 can still maintain a safe distance, and the bending radius of the hose 9 will not increase excessively. This effectively avoids motion interference between the hose 9 and the central cylinder 2. In this embodiment, by setting a transition mechanism, the dynamic interference problem between the hose 9 and the central cylinder 2 can be solved while retaining the original main structure of the fork system. The structure is easy to install and practical, and avoids the cost increase caused by changes in the hydraulic cylinder design or the need for new development. At the same time, it shortens the product development cycle of the fork system.
[0039] In some specific embodiments, combined with Figure 5 and Figure 6 The base of the transition plate 7 is fixed to the welding block 12 of the adjusting cylinder by bolts. The welding position of the welding block 12 can be determined according to actual needs. In actual arrangement, the distance between the two ends of the hose 9 does not need to be too far, for example, attached Figure 4 In the process, the welding block 12 is installed in the area near the trisection point, and a U-shaped hole 121 is formed on the transition plate 7. The second end of the steel pipe 8 passes through the U-shaped hole 121 and is fixedly connected to the transition plate 7 through the plate joint 13.
[0040] Combination Figure 2 In this embodiment, the mast assembly 1 includes an outer mast 101 and an inner mast 102 movably mounted on the outer mast 101. The side-shifting fork assembly 3 also includes a lifting frame. The central cylinder 2 is mounted on the inner mast 102, and the chains 4 on both sides of the central cylinder 2 are fixed to the lifting frame. When the central cylinder 2 extends, the lifting frame moves via the chains 4 to move the side-shifting fork assembly 3 along the height direction of the inner mast 102. The chains 4 are connected to rollers 6 for cyclical movement. This is the original function of the fork system and will not be described in detail here. A side-shifting cylinder is mounted on the lifting frame. The telescopic end of the side-shifting cylinder is connected to the fork carriage 31 and can drive the fork carriage 31 to move laterally relative to the lifting frame to adjust according to the position of the goods to be loaded. The positions of the rod-side inlet 18 and the rodless inlet 19 of the side-shifting cylinder are shown in the attached figure. Figure 4 As shown. The mast assembly 1 also includes a lifting cylinder 5, which is located on both sides of the rear of the central cylinder 2. The telescopic ends of the lifting cylinder 5 are connected to the inner mast 102. When the central cylinder 2 reaches its limit stroke, if the fork carriage 31 needs to be further lifted, the telescopic ends of the lifting cylinder 5 extend, and the lifting cylinder 5 can push the inner mast 102 and the side shift fork assembly 3 together to move along the height direction of the outer mast 101. Example 2
[0041] Based on the same inventive concept as Embodiment 1, this embodiment provides a forklift, characterized in that it includes the engineering machinery fork system described in Embodiment 1.
[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A load fork system for a construction machine, characterized by, The application relates to an engineering machinery fork system. The gate assembly (1) is internally provided with a center oil cylinder (2); The side shift fork assembly (3) is movably arranged on the gate assembly (1), and the side shift fork assembly (3) comprises a fork frame (31) and forks arranged on the two sides of the fork frame (31); the center oil cylinder (2) can drive the side shift fork assembly (3) to move along the gate assembly (1); The hydraulic system comprises oppositely arranged distance adjusting oil cylinders, the distance adjusting oil cylinders are arranged on the fork frame (31), and the telescopic ends of the distance adjusting oil cylinders are connected with the forks on the corresponding sides; The transition mechanism comprises a transition plate (7) and a steel pipe (8), the transition plate (7) is arranged on the distance adjusting oil cylinders; the first end of the steel pipe (8) is connected with the rod cavity oil port of one distance adjusting oil cylinder, the second end of the steel pipe (8) is fixed on the transition plate (7) and connected with the rod cavity oil port of another distance adjusting oil cylinder through a hose (9).
2. The working machine fork system according to claim 1, characterized in that, The base of the transition plate (7) is fixed on the welding blocks (12) of the distance adjusting oil cylinders through bolts.
3. The engineered machine fork system of claim 1, wherein, A plurality of welding blocks (12) are arranged on the distance adjusting oil cylinders at intervals, and the base of the transition plate (7) is fixedly connected with one of the welding blocks (12).
4. The working machine fork system according to claim 3, characterized in that, A U-shaped hole (121) is formed in the transition plate (7), the second end of the steel pipe (8) passes through the U-shaped hole (121) and is fixedly connected with the transition plate (7) through a plate joint (13).
5. The material handling fork system of claim 1, wherein, The steel pipe (8) is a snap nut type steel pipe (8).
6. The material handling fork system of claim 1, wherein, The gate assembly (1) comprises an outer gate (101) and an inner gate (102) movably arranged on the outer gate (101).
7. The working machine fork system of claim 6, wherein, The side shift fork assembly (3) further comprises a lifting frame, the center oil cylinder (2) is arranged on the inner gate (102), chains (4) on the two sides of the center oil cylinder (2) are fixed on the lifting frame, and when the center oil cylinder (2) is extended, the lifting frame moves through the chains (4) to drive the side shift fork assembly (3) to move along the inner gate (102) in the height direction.
8. The working machine fork system of claim 7, wherein, The application further relates to an engineering machinery fork system. The side shift oil cylinder is arranged on the lifting frame, the telescopic end of the side shift oil cylinder is connected with the fork frame (31), and the side shift oil cylinder can drive the fork frame (31) to shift relative to the lifting frame.
9. The engineered machine fork system of claim 7, wherein, The gate assembly (1) further comprises: The lifting oil cylinders (5) are arranged on the two sides of the center oil cylinder (2), the telescopic ends of the lifting oil cylinders (5) are connected with the inner gate (102); When the center oil cylinder (2) reaches the limit stroke, the lifting oil cylinders (5) can drive the inner gate (102) and the side shift fork assembly (3) to move along the outer gate (101) in the height direction.
10. A fork lift truck characterised in that, The application further relates to an engineering machinery fork system.