Wide view three-stage portal

Abstract

The application relates to the field of forklift structures, in particular to a wide-view three-stage portal frame, which comprises a fixed-position outer portal frame, a middle portal frame slidably connected to the outer portal frame, an inner portal frame slidably connected to the middle portal frame, a secondary oil cylinder arranged on the outer portal frame and used for driving the middle portal frame and the inner portal frame to move synchronously, a fork frame slidably connected to the inner portal frame, and a primary oil cylinder arranged on the inner portal frame and used for driving the fork frame to move, wherein two primary oil cylinders are arranged on opposite sides of the inner portal frame close to the middle portal frame, a pipe clamp is arranged on the position, away from the fork frame, of each of the two primary oil cylinders and used for fixing the position of an accessory oil pipe, and a fixer is arranged on the position of the inner portal frame close to the primary oil cylinder and used for allowing the accessory oil pipes at the positions of the two primary oil cylinders to pass through the fixer and be fixed, so that the view obstruction caused by the primary oil cylinders and the accessory oil pipes is reduced, and the possibility of danger occurrence is lowered.

Description

Technical Field

[0001] This application relates to the field of forklift structures, and in particular to a wide-view three-stage mast. Background Technology

[0002] To lift goods from the forks to a designated height, forklifts require a mast for adjusting the height of the fork carriage. Forklifts with a load capacity of 1.5 to 2 tons typically have a three-stage mast, consisting of an outer mast, a middle mast, and an inner mast, arranged from widest to narrowest. The outer mast is fixed in position, while the middle and inner masts can move vertically.

[0003] Two secondary hydraulic cylinders drive the middle mast and inner mast to move. A primary hydraulic cylinder located on the inner mast drives the fork carriage to move. The mast is also equipped with mast hydraulic pipes that drive the cylinders of the mast to run, and attachment hydraulic pipes that drive the attachments on the fork carriage to run. For example, a multi-stage lifting forklift mast assembly with publication number CN108529504A.

[0004] Regarding the aforementioned technologies, the primary hydraulic cylinder is located in the middle of the inner mast. When the inner mast is raised to a higher height, the primary hydraulic cylinder and the corresponding attachment hydraulic lines can easily obstruct the driver's view, making it difficult for the driver to observe the load on the forks and potentially causing danger. Summary of the Invention

[0005] To reduce the likelihood of danger, this application provides a wide-field-of-view three-level gantry.

[0006] The wide-field-of-view three-stage gantry provided in this application adopts the following technical solution.

[0007] A wide-view three-stage mast includes a fixed outer mast, a middle mast slidably connected to the outer mast, an inner mast slidably connected to the middle mast, a secondary hydraulic cylinder located on the outer mast and driving the middle and inner masts to move synchronously, a fork carriage slidably connected to the inner mast, and a primary hydraulic cylinder located on the inner mast and driving the fork carriage to move. Two primary hydraulic cylinders are provided and are located on opposite sides of the inner mast near the middle mast. Each of the two primary hydraulic cylinders is provided with a clamp for fixing the attachment hydraulic pipe at a position away from the fork carriage. A retainer is provided on the inner mast near the primary hydraulic cylinders so that the attachment hydraulic pipes from the two primary hydraulic cylinders can pass through together for fixing the position.

[0008] By adopting the above technical solution, two primary hydraulic cylinders are distributed on opposite sides of the inner mast, and the attachment hydraulic pipes are fixed to the corresponding positions of the primary hydraulic cylinders using pipe clamps. This ensures that when the inner mast is raised, the primary hydraulic cylinders and attachment hydraulic pipes do not obstruct the forklift driver's view significantly, thus reducing the risk.

[0009] Optionally, the fixing device includes a positioning plate that moves synchronously with the inner mast, a reversing column that moves with the positioning plate and around which the attachment oil pipes are wound, and a pressure plate that is detachably connected to the reversing column and fixes all attachment oil pipes at a position where they converge.

[0010] By adopting the above technical solution, the attachment oil pipes corresponding to the two first-stage oil cylinders are combined into one place to ensure that the attachment oil pipes do not easily shake and interfere with the driver's vision during the lifting and lowering of the inner mast.

[0011] Optionally, the positioning plate is slidably connected to a plate slider along the length of the primary cylinder power rod. The plate slider is detachably connected to a pipe limiting component that fixes the position of the attachment oil pipe. The positioning plate is provided with an adjusting component that allows the plate slider to move.

[0012] By adopting the above technical solution, the attachment oil pipe needs to be bent a lot, so a longer length needs to be left during installation to ensure that the attachment oil pipe is not too tight during installation, so as to facilitate the installation work. After the attachment oil pipe is installed, the plate slider can be moved to keep the attachment oil pipe tight, so that the attachment oil pipe is not easy to shake during the movement of the middle mast, inner mast and fork carriage.

[0013] Optionally, the adjusting component is rotatably connected to the positioning plate, and the adjusting component is coaxially fixedly connected to an adjusting screw threaded to the plate slider.

[0014] By adopting the above technical solution, the plate and slider can move stably.

[0015] Optionally, the limiting fitting is rotatably connected to a tubing wheel that can be rolled onto the surface of the fitting tubing.

[0016] By adopting the above technical solution, the plate and slider are less likely to cause excessive wear on the surface of the data oil pipe during the movement of the plate and slider.

[0017] Optionally, the fixture further includes a mounting plate detachably connected to the inner gantry, a positioning plate rotatably connected to the mounting plate, and the rotation axis of the positioning plate being consistent with the length direction of the first-stage hydraulic cylinder.

[0018] By adopting the above technical solution, the positioning plate is less likely to exert excessive pressure on the attachment oil pipe during the tightening process.

[0019] Optionally, the mounting plate is threadedly connected to a positioning rod, the positioning rod is provided with an end rack, and the positioning plate is fixedly connected to a semi-circular gear, the end rack being able to mesh with the semi-circular gear.

[0020] By adopting the above technical solution, after the attachment oil pipe is adjusted, the positioning rod is rotated so that the end rack meshes with the semi-circular gear, making the positioning plate less likely to rotate at will, so as to ensure that the positioning plate does not put too much pressure on the tightened attachment oil pipe when subjected to external force.

[0021] Optionally, the reversing column is slidably connected to the positioning plate along the length of the first-stage hydraulic cylinder power rod. A compression spring that tends to elongate is fixedly connected to the reversing column. A pressure sensor that can be detachably connected to the positioning plate is fixedly connected to the end of the compression spring away from the reversing column. The pressure sensor and the surface of the reversing column that is in contact with the attachment oil pipe are located on opposite sides of the center point of the reversing column.

[0022] By adopting the above technical solution, the tension of the attachment hose can be monitored in real time, so that it can be detected in time when the pressure of the attachment hose is too high. At the same time, the setting of the compression spring also makes it difficult for the tension of the attachment hose to be too high.

[0023] Optionally, the pressure plate is slidably connected to the reversing column, and a pressure screw threaded to the pressure plate is rotatably connected inside the reversing column. A pressure component that drives the pressure screw to rotate is rotatably connected to the reversing column.

[0024] By adopting the above technical solution, it is not necessary to keep the crimp fitting tightly pressed against the accessory hose before the crimp fitting can be installed, making the positioning and fixing of the accessory hose more convenient.

[0025] Optionally, the pressure plate includes a flat plate threaded to the pressure screw and an arc-shaped plate fixedly connected to the flat plate and attached to the attachment oil pipe. The straight line in which the flat plate moves and the radial line in which the reversing column is attached to the attachment oil pipe are located on the same plane and have an included angle.

[0026] By adopting the above technical solution, the flat plate and the curved plate can press the attachment oil pipe tightly at the same time as much as possible, so that the flat plate and the curved plate are less likely to cause excessive wear on the surface of the attachment oil pipe, and also make the installation more convenient.

[0027] In summary, this application includes at least the following beneficial effects.

[0028] Two primary hydraulic cylinders are positioned on opposite sides of the inner mast, and attachment hydraulic hoses are secured to the corresponding positions of the primary hydraulic cylinders using hose clamps. This ensures that the primary hydraulic cylinders and attachment hydraulic hoses do not significantly obstruct the forklift driver's view when the inner mast is raised, thus reducing the risk of injury. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the main structure of Embodiment 1 of this application; Figure 2 This is a structural schematic diagram of Embodiment 2; Figure 3This is a structural schematic diagram from another perspective of Embodiment 2.

[0030] Explanation of reference numerals in the attached diagram: 1. Outer mast; 2. Middle mast; 31. Pressure sensor; 32. Pressure fitting; 33. Flat plate; 34. Arc plate; 35. Pressure screw; 4. Secondary cylinder; 41. Limiting fitting; 42. Adjusting component; 43. Adjusting screw; 44. Pipe wheel; 45. Mounting plate; 46. Positioning rod; 47. End rack; 48. Semi-circular gear; 49. Compression spring; 5. Inner mast; 51. Fork carriage; 52. Primary cylinder; 53. Attachment hose; 54. Pipe clamp; 55. Fixture; 56. Positioning plate; 57. Reversing column; 58. Pressure plate; 59. Plate slider. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1: Embodiment 1 of this application discloses a wide-field-of-view three-stage gantry, referring to... Figure 1 The system includes a vertically fixed outer gantry 1, a middle gantry 2 that is slidably connected between the two vertically opposite sides of the outer gantry 1, an inner gantry 5 that is slidably connected between the two vertically opposite sides of the middle gantry 2, and a secondary hydraulic cylinder 4 that is detachably connected to the outer gantry 1. The secondary hydraulic cylinder 4 drives the middle gantry 2 and the inner gantry 5 to move synchronously via a sprocket seat set at the top of its own power rod and a connecting chain. This is existing technology and will not be described in detail here.

[0033] Reference Figure 1 The inner mast 5 is slidably connected to the two opposite vertical sides of the inner mast 5 along the vertical direction with a fork carriage 51. The inner mast 5 is equipped with two primary hydraulic cylinders 52, which are located one-to-one on the two opposite vertical sides of the inner mast 5. The primary hydraulic cylinders 52 drive the fork carriage 51 to move synchronously via a sprocket seat set at the top of their own power rod and a connecting chain. This is existing technology and will not be described in detail.

[0034] Reference Figure 1 The four attachment oil pipes 53 first pass over the fixed pulley at the top of the middle mast 2 and move downwards to the bottom of the inner mast 5. The bottom of the inner mast 5 is equipped with a fixing device 55 to fix the position of the four attachment oil pipes 53. The four attachment oil pipes 53 need to be tightly inserted into the fixing device 55. Then, the four attachment oil pipes 53 are divided into two groups. Each first-stage cylinder 52 is fixedly connected to a set of two pipe clamps 54 on the vertical side away from the fork carriage 51. Each set of pipe clamps 54 fixes the position of the corresponding set of attachment oil pipes 53 so that the attachment oil pipes 53 do not obstruct the field of vision between the two first-stage cylinders 52.

[0035] The implementation principle of a wide-view three-stage gantry in Embodiment 1 of this application is as follows: the two primary hydraulic cylinders 52 and the two sets of attachment hydraulic pipes 53 are set far apart so that there is less obstruction at the vertical center line of the inner gantry 5.

[0036] Example 2: Embodiment 2 of this application discloses a wide-field-of-view three-stage gantry, referring to... Figure 2 The difference from Embodiment 1 is that the fixture includes a mounting plate 45 detachably connected to the bottom of the inner gantry 5. The mounting plate 45 is rotatably connected to a positioning plate 56. The rotation axis of the positioning plate 56 is vertical. The positioning plate 56 is equipped with a reversing column 57. The attachment oil pipe 53 passes around the lower part of the reversing column 57. The reversing column 57 is equipped with a pressure plate 58 to fix the position of the attachment oil pipe 53. The reversing column 57 is slidably connected to the positioning plate 56 in a vertical direction. The portion of the reversing column 57 located inside the positioning plate 56 is fixedly connected to a vertical compression spring 49. The upper end of the compression spring 49 abuts against a pressure sensor 31. The compression spring 49 applies pressure to the pressure sensor 31. The pressure sensor 31 is electrically connected to an external controller, which can be electrically connected to a corresponding display. This ensures that during the tightening process of attaching the attachment oil pipe 53 to the bottom of the reversing column 57 to tighten the attachment oil pipe 53 located on the side of the reversing column 57 away from the center point of the inner mast 5, the tightening force on the attachment oil pipe 53 is not too large.

[0037] Reference Figure 2 The pressure plate 58 includes a flat plate 33 slidably connected to the end face of the reversing column 57 in a vertical direction. The flat plate 33 is parallel to the vertical end face of the reversing column 57, and its vertical surface can fit against the attachment hose 53. An arc-shaped plate 34 is fixedly connected to the bottom of the flat plate 33, and its inner circumferential wall can fit against the attachment hose 53. An inclined pressure screw 35 is rotatably connected inside the reversing column 57. The length direction of the pressure screw 35 and the radial line where the reversing column 57 fits against the bottom of the attachment hose 53 are on the same plane and have an angle, so that the flat plate 33 and the arc-shaped plate 34 can simultaneously contact the attachment hose 53, making the attachment hose 53 less prone to wear. A pressure fitting 32 is rotatably connected to the upper circumferential outer wall of the reversing column 57, and the pressure fitting 32 is coaxially fixedly connected to the pressure screw 35.

[0038] Reference Figure 2A sliding block 59 is slidably connected to the positioning plate 56 in the vertical direction. The sliding block 59 is detachably connected to a limiting fitting 41. The attachment oil pipe 53 passes between the sliding block 59 and the limiting fitting 41, and is divided into two groups. A set of oil pipe wheels 44 are rotatably connected to the upper and lower parts of the limiting fitting 41. The oil pipe wheels 44 move in close contact with the surface of the attachment oil pipe 53. A vertical adjusting screw 43 is rotatably connected inside the positioning plate 56. The adjusting screw 43 is threaded to the sliding block 59. An adjusting member 42 is rotatably connected to the upper part of the positioning plate 56 and coaxially fixed to the adjusting screw 43, so that the attachment oil pipe 53 located on the side of the reversing column 57 near the center point of the inner gantry 5 is tightened.

[0039] Reference Figure 3 The positioning plate 56 is fixedly connected to a semi-circular gear 48, and the mounting plate 45 is threadedly connected to a horizontal positioning rod 46. The end of the positioning rod 46 near the semi-circular gear 48 is rotatably connected to an end rack 47. The end rack 47 is directionally and slidably connected to the mounting plate 45 and can mesh with the semi-circular gear 48. This allows the positioning plate 56 to be fixed in position after the attachment oil pipe 53 is tightened, so that the tightened attachment oil pipe 53 is less likely to bear excessive pressure from the positioning plate 56 when it is rotated by external force.

[0040] The implementation principle of a wide-view three-level gantry in Embodiment 2 of this application is to enable the attachment oil pipe 53 to be installed at the fixing device 55 and to reduce the wear on the surface of the attachment oil pipe 53 during the installation process.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wide-view three-stage mast, comprising an outer mast (1) with a fixed position, a middle mast (2) slidably connected to the outer mast (1), an inner mast (5) slidably connected to the middle mast (2), a second-stage hydraulic cylinder (4) disposed on the outer mast (1) and driving the middle mast (2) and the inner mast (5) to move synchronously, a fork carriage (51) slidably connected to the inner mast (5), and a first-stage hydraulic cylinder (52) disposed on the inner mast (5) and driving the fork carriage (51) to move, characterized in that: Two primary hydraulic cylinders (52) are provided and are located on opposite sides of the inner mast (5) near the middle mast (2). Each of the two primary hydraulic cylinders (52) is provided with a pipe clamp (54) to fix the position of the attachment oil pipe (53) at a position away from the fork carriage (51). A fixing device (55) is provided at a position of the inner mast (5) near the primary hydraulic cylinder (52) for the attachment oil pipe (53) of the two primary hydraulic cylinders (52) to pass through together for position fixing. The fixture (55) includes a positioning plate (56) that moves synchronously with the inner mast (5), a reversing column (57) that moves with the positioning plate (56) and is around which the attachment oil pipes (53) are wound, and a pressure plate (58) that is detachably connected to the reversing column (57) and fixes all attachment oil pipes (53) at a position where they converge. The reversing column (57) is slidably connected to the positioning plate (56) along the length of the power rod of the first-stage cylinder (52). The reversing column (57) is fixedly connected to a compression spring (49) that tends to extend. The end of the compression spring (49) away from the reversing column (57) is fixedly connected to a pressure sensor (31) that is detachably connected to the positioning plate (56). The pressure sensor (31) and the reversing column (57) are attached to the surface of the attachment oil pipe (53) and are located on opposite sides of the center point of the reversing column (57).

2. The wide-field-of-view three-stage gantry according to claim 1, characterized in that: The positioning plate (56) is slidably connected to a plate slider (59) along the length of the power rod of the first-stage cylinder (52). The plate slider (59) is detachably connected to a pipe limiting component (41) for fixing the position of the attachment oil pipe (53). The positioning plate (56) is provided with an adjusting component (42) that allows the plate slider (59) to move.

3. A wide-field-of-view three-stage gantry according to claim 2, characterized in that: The adjusting component (42) is rotatably connected to the positioning plate (56), and the adjusting component (42) is coaxially fixedly connected to the adjusting screw (43) threaded to the plate slider (59).

4. A wide-field-of-view three-stage gantry according to claim 2, characterized in that: The limiting fitting (41) is rotatably connected to a tubing wheel (44) that can be rolled onto the surface of the fitting tubing (53).

5. A wide-field-of-view three-stage gantry according to claim 1, characterized in that: The fixture (55) also includes a mounting plate (45) detachably connected to the inner gantry (5), and a positioning plate (56) rotatably connected to the mounting plate (45). The rotation axis of the positioning plate (56) is consistent with the length direction of the first-stage hydraulic cylinder (52).

6. A wide-field-of-view three-stage gantry according to claim 5, characterized in that: The mounting plate (45) is threadedly connected to a positioning rod (46), the positioning rod (46) is provided with an end rack (47), and the positioning plate (56) is fixedly connected to a semi-circular gear (48), the end rack (47) can mesh with the semi-circular gear (48).

7. A wide-field-of-view three-stage gantry according to claim 1, characterized in that: The pressure plate (58) is slidably connected to the reversing column (57), and the reversing column (57) is rotatably connected to the pressure plate (58) with a threaded screw (35). The reversing column (57) is rotatably connected to a pressure fitting (32) that drives the pressure screw (35) to rotate.

8. A wide-view three-stage gantry according to claim 7, characterized in that: The pressure plate (58) includes a flat plate (33) threaded to the pressure screw (35) and an arc plate (34) fixedly connected to the flat plate (33) and attached to the attachment oil pipe (53). The straight line of the moving direction of the flat plate (33) and the radial line of the reversing column (57) attached to the attachment oil pipe (53) are on the same plane and have an angle.

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