Hydraulic pipeline structure of free mast of forklift truck

Abstract

This utility model relates to a hydraulic pipeline structure for a forklift's free mast, installed between the free masts of the forklift. The free mast includes a fork carriage that is slidably mounted on the outer mast via a front lifting cylinder. There are two front lifting cylinders, symmetrically arranged on the left and right outer sides of the outer mast. The hydraulic pipeline of the front lifting cylinder includes an external hose located on the outer side of the outer mast, a middle hose vertically mounted on the outer mast, and an internal hose located between the inner and outer masts. One end of the external hose is connected to the front lifting cylinder, and the other end is connected to the upper end of the middle hose. One end of the internal hose is connected to the lower end of the middle hose, and the other end is connected to the forklift's hydraulic oil supply pipeline. This utility model features a simple cylinder pipeline layout, easy installation, resistance to interference, long service life, convenient maintenance and repair, and low operating costs.

Description

Technical Field

[0001] This utility model relates to a hydraulic pipeline structure for a forklift free mast, belonging to the field of forklift technology. Background Technology

[0002] The two-stage fully free mast structure is an indispensable part of forklift mast systems. In a two-stage fully free mast, the mast panel, mast beam, and mast post are all connected by movable brackets, allowing the mast panel to rotate freely to meet the requirement of the mast panel being flush with the goods during transportation. The two-stage fully free mast provides an effective solution for forklift use in confined spaces or at extremely high heights. It can effectively complete the transfer of goods in tight spaces using its free travel, and can also complete the lifting of goods at great heights using the large lifting height provided by the two-stage hydraulic cylinder, making it suitable for industries such as industrial enterprises.

[0003] The two-stage fully free gantry achieves lifting and tilting functions through two-stage hydraulic cylinders. The installation method of the cylinders and pipelines directly affects the performance and reliability of the gantry. The main problems with existing two-stage fully free gantry technologies are: complex cylinder and pipeline layout, resulting in low installation efficiency; pipelines are laid in various gaps or narrow spaces, making them susceptible to external interference, leading to leaks or damage; and maintenance and repair are inconvenient, increasing operating costs.

[0004] Therefore, there is an urgent need for a free gantry hydraulic pipeline structure that features a simple cylinder pipeline layout, easy installation, resistance to interference, long service life, convenient maintenance and repair, and low operating costs. Summary of the Invention

[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a free gantry hydraulic pipeline structure that is simple in cylinder pipeline layout, easy to install, not easily interfered with, long in service life, convenient in maintenance and repair, and low in operating cost.

[0006] The purpose of this utility model is achieved as follows:

[0007] A hydraulic piping structure for a forklift free mast is installed between the free masts of the forklift. The free mast includes an inner mast that is hinged to the forklift frame via a tilting cylinder, an outer mast that is slidably mounted on the inner mast via a rear lifting cylinder, and a fork carriage that is slidably mounted on the outer mast via a front lifting cylinder.

[0008] There are two front lifting cylinders, symmetrically arranged on the left and right outer sides of the outer mast; the hydraulic lines of the front lifting cylinders include an external hose located on the outer side of the outer mast, a middle hose vertically arranged on the outer mast, and an internal hose located between the inner and outer masts; one end of the external hose is connected to the front lifting cylinder and the other end is connected to the upper end of the middle hose; one end of the internal hose is connected to the lower end of the middle hose and the other end is connected to the forklift hydraulic oil supply line.

[0009] Furthermore, hose supports are vertically installed on the left and right outer sides of the outer frame, with the middle part of the external hose located inside the hose support and the upper part freely bending; the middle part of the internal hose is also freely bending.

[0010] Furthermore, an outer hinge bracket and an inner hinge bracket are respectively provided between the inner frame and the outer frame, which are used to place and protect the bent portion of the upper part of the external hose and the bent portion of the internal hose, respectively.

[0011] Furthermore, a sprocket is installed at the end of the piston rod of the front lifting cylinder, and a chain is embedded in the rope groove of the sprocket. The two ends of the chain are connected to the outer mast and the fork carriage, respectively.

[0012] Furthermore, a hose roller is installed on the sprocket shaft located on the left side of the outer gantry, and the hose roller rotates synchronously with the sprocket.

[0013] Furthermore, the fork carriage is connected to an attachment hydraulic line, including a first hose, a second hose vertically mounted on the outer mast, a third hose mounted on the left side of the outer mast, and a fourth hose that passes over a hose roller; the two ends of the first hose are respectively connected to the forklift hydraulic oil supply line and the lower end of the second hose, the two ends of the third hose are respectively connected to the upper end of the second hose and the fourth hose, and the fourth hose passes over the hose roller and connects to an attachment valve mounted on the fork carriage to supply oil to the attachments on the fork carriage.

[0014] Furthermore, the hydraulic pipeline of the attachment includes three lines, and the corresponding first hose, second hose, third hose and fourth hose are all three hose groups arranged in parallel. The hose roller is provided with three tube grooves for embedding the three hoses of the fourth hose.

[0015] Furthermore, the forklift hydraulic supply line includes mast hydraulic hoses supplying oil to the tilt cylinder, rear lifting cylinder, and front lifting cylinder, as well as attachment hoses supplying oil to the fork carriage attachments.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model places two front lifting cylinders on the outside of the front mast, and exposes the movable part of their hydraulic lines in an open space, eliminating interference from other components and preventing leakage or damage caused by external interference, thus improving the service life of the hydraulic lines. Similarly, placing the attachment hydraulic lines in the open space outside the front mast also avoids interference from other components and improves the service life of the lines. This simplifies the cylinder and pipeline layout, improves installation efficiency, simplifies maintenance and repair work, and reduces operating costs. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the hydraulic pipeline structure of a forklift free mast according to the present invention.

[0019] Figure 2 This is a side view schematic diagram of the hydraulic pipeline structure of a forklift free mast according to the present invention.

[0020] Figure 3 This is a schematic diagram of the hydraulic pipeline structure of a forklift free mast according to the present invention.

[0021] Figure 4 This is a side view of the hydraulic pipeline structure of a forklift free mast according to the present invention.

[0022] in:

[0023] 1. Tilting cylinder; 2. Inner mast; 3. Rear lifting cylinder; 4. Outer mast; 5. Front lifting cylinder; 6. Fork carriage; 7. Forklift hydraulic supply line; 8. Hose support.

[0024] External hose 51, internal hose 53, sprocket 54, chain 55, hose roller 56, first hose 61, third hose 63, fourth hose 64, gantry hydraulic hose 71, attachment hose 72. Detailed Implementation

[0025] See Figures 1-4 This utility model relates to a hydraulic pipeline structure for a forklift free mast, which is installed between the free masts of the forklift. The free mast includes an inner mast 2 that is hinged to the forklift frame via a tilting cylinder 1, an outer mast 4 that is slidably mounted on the inner mast 2 via a rear lifting cylinder 3, and a fork carriage 6 that is slidably mounted on the outer mast 4 via a front lifting cylinder 5.

[0026] There are two front lifting cylinders 5 to meet the lifting requirements of the large-tonnage fully free mast forklift. The two front lifting cylinders 5 are symmetrically arranged on the left and right sides of the outer mast 4. A sprocket 54 is installed at the piston rod end of the front lifting cylinder 5. A chain 55 is embedded in the rope groove of the sprocket 54. The two ends of the chain 55 are connected to the outer mast 4 and the fork carriage 6, respectively. A hose roller 56 is installed on the shaft of the sprocket 54 on the left side of the outer mast 4. The hose roller 56 rotates synchronously with the sprocket 54. Hose supports 8 are vertically arranged on the left and right sides of the outer mast 4. A movable and flexible outer hinge support and an inner hinge support are respectively arranged between the inner mast 2 and the outer mast 4. The hinge support is a conventional technology used to protect moving cables, pipes, etc., and is not shown in the attached drawings of this embodiment.

[0027] The forklift hydraulic oil supply line 7 includes a mast hydraulic hose 71 that supplies oil to the tilt cylinder 1, the rear lifting cylinder 3, and the front lifting cylinder 5, and an attachment hose 72 that supplies oil to the attachments of the fork carriage 6.

[0028] The hydraulic lines of the front lifting cylinder 5 include an external hose 51 located on the outside of the outer mast 4, a middle hose vertically mounted on the outer mast 4, and an internal hose 53 located between the inner mast 2 and the outer mast 4. One end of the external hose 51 is connected to the front lifting cylinder 5, and the other end is connected to the upper end of the middle hose. One end of the internal hose 53 is connected to the lower end of the middle hose, and the other end is connected to the mast hydraulic hose 71 of the forklift hydraulic oil supply line 7. The middle part of the external hose 51 is located inside the hose support 8, and the upper part is freely bent. The bent part is placed inside the outer hinge support and bends synchronously with the external hose 51 to protect the hose. The middle part of the internal hose 53 is freely bent, and the bent part is placed inside the inner hinge support and bends synchronously with the internal hose 53 to protect the hose. When the outer gantry 4 is raised or lowered, the bent part of the external hose 51 is in an open space and will not be affected by external forces, thus avoiding problems such as leakage or damage. The middle hose is located in the protective groove inside the outer gantry 4, and the bent part of the internal hose 53 is protected by the inner hinge bracket. Both are effectively protected, thus improving their service life.

[0029] The fork carriage 6 is connected to an attachment hydraulic line, including a first hose 61, a second hose vertically mounted on the outer mast 4, a third hose 63 located on the left side of the outer mast 4, and a fourth hose 64 that passes over a hose roller 56. The two ends of the first hose 61 are connected to the attachment hose 72 and the lower end of the second hose of the forklift hydraulic oil supply line 7, respectively. The two ends of the third hose are connected to the upper end of the second hose and the fourth hose, respectively. The fourth hose 64 passes over the hose roller 56 and connects to an attachment valve mounted on the fork carriage 6 to supply oil to the attachments on the fork carriage 6. In this embodiment, the attachment hydraulic line includes three lines, with the first hose 61, second hose, third hose 63, and fourth hose 64 being three hoses arranged in parallel. The hose roller 56 has three slots for accommodating the three hoses of the fourth hose 64. When the fork carriage 6 is raised or lowered, the upper and lower ends of the third rubber hose 63 with hydraulic lines are both in an open space and will not be affected by external forces, thus avoiding leakage or damage and extending service life.

[0030] The intermediate hose and the second hose are both straight hoses installed inside the outer gantry 4, and are distributed to connect the external hose 51, the internal hose 53, the first hose 61, and the third hose 63. The structure is relatively simple and is not shown in the attached drawings.

[0031] This utility model arranges the vulnerable moving parts of the mast hydraulic lines and attachment hydraulic lines during the lifting of the outer mast 4 and the fork carriage 6, namely the external rubber hose 51 of the front lifting cylinder 5 hydraulic line and the third rubber hose 63 of the attachment hydraulic line, in the open space outside the outer mast 4. This simplifies the pipeline layout structure, makes installation and maintenance more convenient, improves efficiency, and is not affected by external forces from other components, making it less prone to leakage or damage, thus extending its service life and reducing forklift operating costs.

[0032] Additionally, it should be noted that the above-described specific implementation is merely an optimized solution of this patent, and any modifications or improvements made by those skilled in the art based on the above concept are within the scope of protection of this patent.

Claims

1. A hydraulic piping structure for a forklift free mast, installed between the free masts of a forklift, the free mast comprising an inner mast (2) hinged to the forklift frame via a tilting cylinder (1), an outer mast (4) slidably mounted on the inner mast (2) via a rear lifting cylinder (3), and a fork carriage (6) slidably mounted on the outer mast (4) via a front lifting cylinder (5), characterized in that: There are two front lifting cylinders (5), which are symmetrically arranged on the left and right sides of the outer mast (4); the hydraulic lines of the front lifting cylinders (5) include an external rubber hose (51) arranged on the outside of the outer mast (4), a middle rubber hose arranged vertically on the outer mast (4), and an internal rubber hose (53) arranged between the inner mast (2) and the outer mast (4); one end of the external rubber hose (51) is connected to the front lifting cylinder (5), and the other end is connected to the upper end of the middle rubber hose; one end of the internal rubber hose (53) is connected to the lower end of the middle rubber hose, and the other end is connected to the forklift hydraulic oil supply line (7).

2. The hydraulic piping structure of the forklift free mast according to claim 1, characterized in that: A hose support (8) is vertically installed on the left and right sides of the outer frame (4). The middle part of the external hose (51) is located inside the hose support (8), and the upper part is freely bent; the middle part of the internal hose (53) is freely bent.

3. The hydraulic piping structure of the forklift free mast according to claim 2, characterized in that: An outer hinge bracket and an inner hinge bracket are respectively provided between the inner frame (2) and the outer frame (4) to place and protect the curved part of the upper part of the external hose (51) and the curved part of the internal hose (53).

4. The hydraulic piping structure of the forklift free mast according to claim 1, characterized in that: The piston rod end of the front lifting cylinder (5) is equipped with a sprocket (54), and a chain (55) is embedded in the rope groove of the sprocket (54). The two ends of the chain (55) are connected to the outer mast (4) and the fork carriage (6) respectively.

5. The hydraulic piping structure of the forklift free mast according to claim 4, characterized in that: A hose roller (56) is installed on the sprocket (54) shaft located on the left side of the outer gantry (4). The hose roller (56) rotates synchronously with the sprocket (54).

6. The hydraulic piping structure of the forklift free mast according to claim 5, characterized in that: The fork carriage (6) is connected to an attachment hydraulic line, including a first hose (61), a second hose vertically mounted on the outer mast (4), a third hose (63) mounted on the left side of the outer mast (4), and a fourth hose (64) that passes over a hose roller (56). The two ends of the first hose (61) are respectively connected to the forklift hydraulic oil supply line (7) and the lower end of the second hose. The two ends of the third hose are respectively connected to the upper end of the second hose and the fourth hose. The fourth hose (64) passes over the hose roller (56) and is connected to an attachment valve mounted on the fork carriage (6) to supply oil to the attachments on the fork carriage (6).

7. The hydraulic piping structure of the forklift free mast according to claim 6, characterized in that: The hydraulic pipeline of the attachment includes three lines. The first hose (61), the second hose, the third hose (63), and the fourth hose (64) are all three hoses arranged in parallel. The hose roller (56) is provided with three pipe grooves for embedding the three hoses of the fourth hose (64).

8. The hydraulic piping structure of the forklift free mast according to claim 1, characterized in that: The forklift hydraulic oil supply line (7) includes a mast hydraulic hose (71) that supplies oil to the tilt cylinder (1), the rear lifting cylinder (3), and the front lifting cylinder (5), and an attachment hose (72) that supplies oil to the fork carriage (6) attachment.

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