Three-stage portal pipeline arrangement of free lifting forklift

Abstract

The invention discloses a pipeline arrangement of a three-stage gantry of a free lifting forklift, the three-stage gantry comprises an outer gantry, a middle gantry, an inner gantry and a fork tool, and the pipeline arrangement comprises a gantry lifting pipeline arrangement, a fork tool lifting pipeline arrangement and a switching valve block; the adapter valve block is arranged on the outer side of the inner portal; gantry lifting pipelines are fixedly arranged on the two sides of the outer gantry, and a gantry lifting oil cylinder of the third-stage gantry is connected with a switching valve block through a first extending oil pipe; the fork tool lifting pipelines are fixedly arranged on the two sides of the inner portal. The beneficial effects are that the visual field of a driver is expanded through the structural design of the technical scheme, and the operation safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pipeline design, and particularly to a pipeline layout of a three-stage mast for a free-lifting forklift. Background Art

[0002] For forklifts used in places with limited height requirements and large lifting heights, free-lifting multi-stage masts need to be configured. Currently, common ones include free-lifting two-stage masts and free-lifting three-stage masts. In a three-stage mast with a free-lifting mechanism installed in the inner mast, the free-lifting oil cylinder and numerous pipelines occupy the internal space of the inner mast, making installation and maintenance difficult. Therefore, it is necessary to develop a pipeline layout for the three-stage mast of a free-lifting forklift. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide a pipeline layout for the three-stage mast of a free-lifting forklift, solving one or more of the above-mentioned prior art problems.

[0004] To solve the above technical problem, a technical solution adopted by the present invention is: a pipeline layout for the three-stage mast of a free-lifting forklift, the three-stage mast including an outer mast, a middle mast, an inner mast, and a fork attachment. The innovation lies in that: the pipeline layout includes a mast lifting pipeline layout, a fork attachment lifting pipeline layout, and a transfer valve block;

[0005] The transfer valve block is arranged on the outer side of the inner mast;

[0006] The mast lifting pipeline layout is fixed on both sides of the outer mast. The mast lifting pipeline layout includes a mast rope pulley and a mast oil pipe. The mast rope pulley is arranged on the middle mast. One end of the mast oil pipe is connected to the mast lifting hydraulic system of the forklift, and the other end thereof bypasses the mast rope pulley on the middle mast and then is connected to the oil inlet interface of the transfer valve block on the outer side of the inner mast;

[0007] The mast lifting oil cylinder of the three-stage mast is connected to the transfer valve block through a first extension oil pipe;

[0008] The fork attachment lifting pipeline layout is fixed on both sides of the inner mast. The fork attachment lifting pipeline layout includes a free-lifting rope pulley and a free-lifting oil pipe. The free-lifting rope pulley is arranged on the top of the free-lifting oil cylinder. One end of the free-lifting oil pipe is docked with the oil outlet interface of the transfer valve block, and the other end thereof bypasses the free-lifting rope pulley on the top of the free-lifting oil cylinder and then is docked with the oil pipe fixing plate on the fork attachment. The fork attachment oil pipe is provided on the fork attachment oil pipe fixing plate, and the end of the fork attachment oil pipe is docked with the fork attachment oil cylinder of the fork attachment.

[0009] In some embodiments, the adapter valve block is fixedly connected to the outer side of the inner gantry by bolts, and the adapter valve block is provided with a plurality of oil circuit interfaces, which are respectively in sealed butt joint with the gantry oil pipe, the free lift oil pipe, and the free lift cylinder oil pipe.

[0010] In some embodiments, the gantry rope wheels are symmetrically installed at the tops of both sides of the middle gantry, and the path formed by the gantry oil pipe bypassing the gantry rope wheels matches the lifting movement trajectory of the middle gantry.

[0011] In some embodiments, the forklift attachment oil pipe fixing plates are welded to both sides of the forklift attachment, and the forklift attachment oil pipe fixing plates are provided with a groove structure for fixing the ends of the forklift attachment oil pipes and preventing them from sliding.

[0012] In some embodiments, the piston rod end of the gantry lifting cylinder is connected to the middle gantry, and the telescopic movement of the gantry lifting cylinder has a linear relationship with the synchronous lifting height of the outer gantry and the middle gantry.

[0013] In some embodiments, the axis of the free lift rope wheel is collinear with the axis of the piston rod of the free lift cylinder. When the free lift cylinder makes a telescopic movement, under the guidance of the free lift rope wheel, the free lift oil pipe and the forklift attachment are lifted or lowered synchronously.

[0014] The beneficial effects of the present invention are as follows: The structural design of this technical solution expands the driver's field of vision and improves operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention, where:

[0016] Figure 1 is the overall structural schematic diagram of the three-stage gantry pipeline layout of a free lift forklift of the present invention.

[0017] Figure 2 is the structural schematic diagram of the forklift attachment free lift state and the gantry pipeline layout of the three-stage gantry pipeline layout of a free lift forklift of the present invention.

[0018] Figure 3 is the structural schematic diagram of the pipeline layout in the fully lifted state of the three-stage gantry of the three-stage gantry pipeline layout of a free lift forklift of the present invention.

[0019] Figure 4 is the exploded view of the three-stage gantry pipeline layout of a free lift forklift of the three-stage gantry pipeline layout of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figures 1 to 4 shown, the embodiments of the present invention include:

[0022] A three-stage mast pipeline layout for a free-lifting forklift, including an outer mast 1, a middle mast 2, an inner mast 3 and a fork 12. The pipeline system consists of a mast lifting pipeline layout, a fork lifting pipeline layout and a transfer valve block 11. By optimizing the pipeline layout and component connection method, the problems of crowded internal space and difficult maintenance of the traditional mast are solved.

[0023] The transfer valve block 11 is fixed on the outer side of the inner mast 3 and is symmetrically distributed on both sides. Its surface is provided with oil circuit interfaces, which are respectively connected to the mast lifting oil pipe 5, the free-lifting oil pipe 8 and the free-lifting oil cylinder oil pipe 10.

[0024] Working principle: The transfer valve block 11 serves as the distribution hub of the hydraulic system, receives the oil from the mast lifting hydraulic system, and guides the oil to the fork cylinder 14 and the free-lifting oil cylinder 9 respectively through the internal flow path.

[0025] Mast rope pulley 4 and oil pipe path: The mast rope pulleys 4 are symmetrically installed on the tops of both sides of the middle mast 2. One end of the mast oil pipe 5 is connected to the forklift mast lifting hydraulic system, and the other end bypasses the mast rope pulley 4 and then extends downward along the outer side of the middle mast 2 and finally is connected to the oil inlet interface of the transfer valve block 11 Figure 3 .

[0026] Linkage of the mast lifting cylinder 6: The piston rod end of the mast lifting cylinder 6 is connected to the top of the middle mast 2, and the cylinder stroke is linearly proportional to the lifting height of the inner mast 3 and the middle mast 2. When lifting, the cylinder extends, driving the middle mast 2 and the inner mast 3 to rise synchronously, and the mast oil pipe 5 follows under the guidance of the mast rope pulley 4 to avoid bending claim 5.

[0027] Fixing of the free-lifting rope pulley 7 and the oil pipe: The free-lifting rope pulley 7 is installed on the top of the free-lifting oil cylinder 9, and its axis is collinear with the axis of the piston rod of the free-lifting oil cylinder 9. After the free-lifting oil pipe 8 bypasses the rope pulley, the end is fixed to both sides of the fork 12 through the fork oil pipe fixing plate claim 4. The fixing plate is installed by welding, and the surface is provided with a U-shaped card slot to cooperate with bolts to fasten the oil pipe Figure 4 .

[0028] Cylinder Arrangement: The free-lift cylinder 9 is installed outside the inner mast 3 and is connected to the transfer valve block 11 through the free-lift cylinder oil pipe 10. The piston rod end is coaxial with the sprocket, driving the free-lift rope pulley 7 to rotate (Claim 6).

[0029] Forklift Attachment Lifting Process:

[0030] First-stage Lifting: The free-lift cylinder 9 extends, pulling the free-lift oil pipe 8 through the rope pulley 7, and the forklift attachment 12 rises independently to the end of the free-lift stroke.

[0031] Second-stage Lifting: The mast lifting cylinder 6 extends, driving the middle mast 2, inner mast 3, and forklift attachment 12 as a whole to the maximum height. Figure 3 .

[0032] Lowering Process: When the lifting cylinder retracts, the mast oil pipe 5 and the free-lift oil pipe 8 follow under the guidance of the rope pulley to ensure that the pipeline is not slack or entangled.

[0033] Hydraulic System Oil Supply: The high-pressure oil output by the forklift hydraulic pump is transported to the transfer valve block 11 through the mast oil pipe 5 and is distributed by the transfer valve block to the forklift attachment cylinder 14 and the free-lift cylinder 9.

[0034] Staged Lifting Control: During the free-lift stage, the oil first drives the free-lift cylinder 9, and the forklift attachment 12 rises separately; during the mast lifting stage, the oil switches to the mast lifting cylinder 6, and the inner mast 3 and the middle mast 2 lift synchronously.

[0035] Pipeline Coordinated Movement: All oil pipes are guided by rope pulleys, and the path strictly matches the movement trajectory of the mast. The redundant design of the oil pipe length avoids stretching and breaking.

[0036] Space Optimization: The external design of the transfer valve block 11 and the oil pipes releases the space of the inner mast, improving the driver's vision; Convenient Maintenance: Bolt connection and modular valve blocks are convenient for disassembly and maintenance; Reliability Improvement: Anti-slip rope pulleys, multi-layer steel wire oil pipes, and pressure balance design significantly reduce pipeline wear and hydraulic shock.

[0037] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. Pipeline layout of a three-stage mast for a free-lifting forklift, the three-stage mast comprising an outer mast (1), a middle mast (2), an inner mast (3) and a fork (12), characterized in that: The pipeline arrangement includes a mast lifting pipeline arrangement, a fork (12) lifting pipeline arrangement, and a transfer valve block (11); The transfer valve block (11) is arranged on the outer side of the inner mast (3); The mast lifting pipeline arrangement is fixed on both sides of the outer mast (1). The mast lifting pipeline arrangement includes a mast rope pulley (4) and a mast oil pipe (5). The mast rope pulley (4) is arranged on the middle mast (2). One end of the mast oil pipe (5) is connected to the mast lifting hydraulic system of the forklift, and the other end is connected to the oil inlet interface of the transfer valve block (11) on the outer side of the inner mast (3) after bypassing the mast rope pulley (4) on the middle mast (2); The mast lifting cylinder (6) of the three-stage mast is connected to the transfer valve block (11) through a first extension oil pipe (10); The fork (12) lifting pipeline arrangement is fixed on both sides of the inner mast (3). The fork (12) lifting pipeline arrangement includes a free lift rope pulley (7) and a free lift oil pipe (8). The free lift rope pulley (7) is arranged on the top of the free lift cylinder (9). One end of the free lift oil pipe (8) is butted against the oil outlet interface of the transfer valve block (11), and the other end is butted against the oil pipe fixing plate on the fork (12) after bypassing the free lift rope pulley (7) on the top of the free lift cylinder (9). The fork oil pipe fixing plate is provided with a fork oil pipe (13), and the end of the fork oil pipe (13) is butted against the fork cylinder (14) of the fork (12).

2. The three-stage mast pipeline layout of a free-lifting forklift according to claim 1, characterized in that: The transfer valve block (11) is fixedly connected to the outer side of the inner mast (3) by bolts, and the transfer valve block (11) is provided with a plurality of oil circuit interfaces, which are hermetically butted against the mast oil pipe (5), the free lift oil pipe (8), and the free lift cylinder oil pipe respectively; 3. The three-stage mast pipeline layout of a free-lifting forklift according to claim 1, characterized in that: The mast rope pulleys (4) are symmetrically installed on the top of both sides of the middle mast (2), and the path formed by the mast oil pipe (5) bypassing the mast rope pulleys (4) matches the lifting movement track of the middle mast (2); 4. The three-stage mast pipeline layout of a free-lifting forklift according to claim 1, characterized in that: The fixing plate of the fork oil pipe (13) is welded to both sides of the fork (12), and the fixing plate of the fork oil pipe (13) is provided with a groove structure for fixing the end of the fork oil pipe (13) and preventing it from sliding; 5. The three-stage mast pipeline layout of a free-lifting forklift according to claim 1, characterized in that: The piston rod end of the mast lifting cylinder (6) is connected to the middle mast (2), and the telescopic movement of the mast lifting cylinder (6) has a linear relationship with the synchronous lifting height of the outer mast (1) and the middle mast (2); 6. The three-stage mast pipeline layout of a free-lifting forklift according to claim 1, characterized in that: The axis of the free lift rope pulley (7) is collinear with the axis of the piston rod of the free lift cylinder. When the free lift cylinder (9) makes a telescopic movement, under the guidance of the free lift rope pulley (7), the free lift oil pipe (8) and the fork (12) are lifted or lowered synchronously.

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