Forklift side door hinge capable of hovering at any point within opening and closing range and forklift

Abstract

The forklift side door hinge comprises a movable hinge plate, a fixed hinge plate and a rotating shaft, one end of the movable hinge plate and one end of the fixed hinge plate are each provided with an installation groove, and the end, provided with the installation groove, of the movable hinge plate is arranged in the installation groove in one end of the fixed hinge plate. A rotating shaft penetrates through the movable hinge plate and the fixed hinge plate, is limited through a check ring, is sequentially sleeved with a magnetostriction body and a coil from inside to outside, is connected with the fixed hinge plate and the magnetostriction body in a clamped mode, and is rotationally connected with the movable hinge plate. And the magnetostriction body is expanded by electrifying the coil so as to limit the rotation of the movable hinge plate relative to the fixed hinge plate. The side door of the forklift cab can be suspended and limited in position after being opened by any angle within the opening and closing range, and various requirements of actual operation are better met.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a forklift side door hinge which can be suspended at any point within an opening and closing range and a forklift. Background Art

[0002] The side door of the forklift cab is connected to the cab frame by a hinge. When the side door is closed, it is fixed to the cab frame by a door lock. When the side door is opened, it is restricted to a certain angle position by a (segmented) gas spring, a magnetic device, or a hook. However, the designed fixing point may not fully meet the degree of opening and closing of the side door during actual operation. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, one purpose of the utility model is to provide a forklift side door hinge and a forklift that can hover at any point within the opening and closing range, so that the forklift cab side door can hover and limit the position after opening at any angle within the opening and closing range, which is more in line with various needs of actual operations.

[0004] The forklift side door hinge and forklift proposed by the utility model that can hover at any point within the opening and closing range include a movable hinge plate, a fixed hinge plate and a rotating shaft, one end of the movable hinge plate and the fixed hinge plate are both provided with a mounting groove, the end of the movable hinge plate with the mounting groove is arranged in the mounting groove of one end of the fixed hinge plate, and the movable hinge plate and the fixed hinge plate are penetrated by a rotating shaft, the rotating shaft is limited by a retaining ring, a magnetostrictive body and a coil are sequentially sleeved on the rotating shaft from the inside to the outside, the rotating shaft is clamped with the fixed hinge plate and the magnetostrictive body, the rotating shaft is rotatably connected with the movable hinge plate, and the magnetostrictive body is expanded by energizing the coil to limit the rotation of the movable hinge plate relative to the fixed hinge plate.

[0005] Preferably, a thrust washer is further provided between the movable hinge plate and the fixed hinge plate.

[0006] Preferably, a tongue plate is fixedly provided at one end of the movable hinge plate away from the fixed hinge plate, a locking bracket is provided on the tongue plate, the locking bracket is fixedly connected to the fixed plate, and a locking bolt and a locking nut are also provided on the locking bracket for fixing the distance between the movable hinge plate and the fixed plate.

[0007] The forklift provided by the present invention comprises the forklift side door hinge which can be suspended at any point within the opening and closing range as described above.

[0008] Preferably, the fixed hinge plate is fixed to the rear leg of the overhead guard of the forklift, the fixed plate on the movable hinge plate is fixed to the side door of the cab of the forklift, and the coil is connected to the power supply of the forklift.

[0009] The beneficial effects of the present invention are:

[0010] (1) The hinge of the utility model can realize the hovering and position limitation of the side door of the forklift cab after opening to any angle within the opening and closing range without adding additional parts, thus meeting various needs of actual operation.

[0011] (2) The forklift cab usually has certain requirements for the sealing of the side door. Rainwater should not penetrate into the cab through the gap between the side door and the overhead guard. It is difficult to adjust the gap between the side door and the overhead guard with the existing two-piece hinge. The hinge of the utility model can adjust the gap between the side door and the overhead guard, eliminating the problem of poor sealing caused by processing errors.

[0012] (3) The side door of the forklift cab is usually not a regular quadrilateral frame. In order to ensure that the upper hinge and the lower hinge of the irregular polygonal side door rotate around the same axis, the lengths of the movable plates of the upper hinge and the lower hinge need to be designed to be different, that is, the upper and lower hinges need to be divided into two materials. The hinge of the utility model can realize the unified shape of the upper and lower hinges of the side door, thereby reducing production management costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the forklift side door hinge that can be suspended at any point within the opening and closing range proposed by the utility model;

[0014] Figure 2 It is a cross-sectional view of the forklift side door hinge proposed by the utility model which can be suspended at any point within the opening and closing range;

[0015] Figure 3 It is an exploded schematic diagram of the forklift side door hinge proposed by the utility model which can be suspended at any point within the opening and closing range;

[0016] Figure 4 This is a schematic diagram of the structure of the connection between the forklift side door hinge and the side door proposed by the utility model;

[0017] Figure 5 The utility model is a schematic diagram of the side door of the forklift when the side door hinge is opened.

[0018] In the figure: 1-locking bolt, 2-locking nut, 3-locking bracket, 4-tongue plate, 5-fixed plate, 6-movable hinge plate, 7-retaining ring, 8-thrust washer, 9-fixed hinge plate, 10-rotating shaft, 11-coil, 12-magnetostrictive body, 13-rear support leg of overhead guard, 14-side door of cab. DETAILED DESCRIPTION

[0019] Example 1

[0020] Reference Figure 1-3, a forklift side door hinge and a forklift that can hover at any point within the opening and closing range, including a forklift side door hinge and a forklift that can hover at any point within the opening and closing range proposed by the utility model, including a movable hinge plate 6, a fixed hinge plate 9 and a rotating shaft 10, one end of the movable hinge plate 6 and the fixed hinge plate 9 are both provided with a mounting groove, one end of the movable hinge plate 6 with the mounting groove is arranged in the mounting groove at one end of the fixed hinge plate 9, and the movable hinge plate 6 and the fixed hinge plate 9 are penetrated by the rotating shaft 10, the rotating shaft 10 is limited by the retaining ring 7, the rotating shaft 10 is sequentially sleeved with a magnetostrictive body 12 and a coil 11 from the inside to the outside, the rotating shaft 10 is clamped with the fixed hinge plate 9 and the magnetostrictive body 12, the rotating shaft 10 is rotatably connected with the movable hinge plate 6, and the magnetostrictive body 12 is expanded by energizing the coil 11 to limit the rotation of the movable hinge plate 6 relative to the fixed hinge plate 9.

[0021] A thrust washer 8 is also provided between the movable hinge plate 6 and the fixed hinge plate 9; a tongue plate 4 is fixedly provided at one end of the movable hinge plate 6 away from the fixed hinge plate 9, a locking bracket 3 is provided on the tongue plate 4, the locking bracket 3 is fixedly connected to the fixed plate 5, and a locking bolt 1 and a locking nut 2 are also provided on the locking bracket 3 for fixing the distance between the movable hinge plate 6 and the fixed plate 5.

[0022] Reference Figure 2 , the length of the fixed hinge plate 9 is L 11 , the fixed hinge plate 9 is opened in the rotating arm to L 12 , the length of the movable hinge plate 6 is L 21 , the movable hinge plate 6 rotates the arm to open inside the file L 22 , the thickness of the thrust washer 8 is δ, the length of the coil 11 is L3, the inner diameter of the coil 11 is Φ2, the length of the magnetostrictor 12 when no magnetic field is applied is L4, the outer diameter of the magnetostrictor 12 is Φ3, the diameter of the rotating arm hole of the movable hinge plate 6 is Φ4, the contact surface between the upper end of the rotating shaft 10 and the upper surface of the rotating arm on the fixed hinge plate 9 and the upper surface of the retaining ring 7 is L5, the material of the magnetostrictor 12 is a linear magnetostrictive material, and its length is deformed under the action of an external magnetic field. The magnetostriction rate of the magnetostrictor 12 is λ, and the unit mm is not specified in the text:

[0023] L5∈[L 11 +0.3, L 11 +0.8],

[0024] L 12 ∈[L 21 +2δ+0.3,L 21 +2δ+0.8],

[0025] L4+L4·λ∈[1001‰L 21 , 1002‰L 21 ],

[0026] Φ2∈[Φ3,Φ3+2],

[0027] Φ4∈[Φ 11 +0.4,Φ 11 +1],

[0028] λ∈[1000×10 -6 , 2000×10 -5 ].

[0029] Regardless of the power source used by the forklift, there is at least one 12V or 24V low-voltage DC power supply for powering instruments and lamps, and it is usually independent of the power (electricity) source of the entire vehicle. The coil 11 is connected to the 12V or 24V low-voltage power supply and can be controlled on and off by a switch. The switch is set near the inner handle of the side door of the cab.

[0030] One end of the fixed hinge plate 9 away from its rotating arm is fixed to the rear leg 13 of the overhead guard. The fixed hinge plate 9, the magnetostrictive body 12 and the rotating shaft 10 are splined, and there is no relative rotational movement among the three. When the opening angle of the cab side door 14 is appropriate, the power supply of the coil 11 is turned on, the coil 11 excites a constant magnetic field, the length of the magnetostrictive body 12 is deformed, and the gap between the magnetostrictive body 12 and the rotating arm of the movable hinge plate 6 is wedged to form an interference fit, so that the movable hinge plate 6 cannot rotate relative to the fixed hinge plate 9. When the cab side door 14 needs to be opened and closed, only the power supply of the coil 11 needs to be disconnected, the length of the magnetostrictive body 12 is restored to the original length, and the movable hinge plate 6 can rotate relative to the fixed hinge plate 9.

[0031] Example 2

[0032] Reference Figure 4 and Figure 5 The forklift provided by the present invention comprises the forklift side door hinge that can be suspended at any point within the opening and closing range.

[0033] The fixed hinge plate 9 is fixed on the rear leg 13 of the overhead guard of the forklift, the fixed plate 5 on the movable hinge plate 6 is fixed on the side door 14 of the cab of the forklift, and the coil 11 is connected to the power supply of the forklift.

[0034] Where: magnetostrictive coefficient (linear expansion coefficient) of magnetostrictive body 12 λ = 1500 × 10 -5 , end surface friction coefficient 0.75~0.8, Φ 11 =10mm,Φ 12 =8mm, L 11 =100mm, L 12 =74.6mm, L 21 =70mm, L 22=45mm, δ=2mm, L3=44mm, Φ2=18mm, L4=44.6mm, Φ3=17.5mm, Φ4=10.5mm, L5=100.5mm, after the coil 11 is energized, the length of the magnetostrictive body 12 expands to 45.269mm>L 22 , limiting the relative rotation between the movable hinge plate 6 and the fixed hinge plate 9, after the coil 11 is powered off, the length of the magnetostrictive body 12 is restored to L3 <L 22 , the movable hinge plate 6 and the fixed hinge plate 9 can rotate relative to each other.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A forklift side door hinge that can hover at any point within the opening and closing range, characterized by: The invention comprises a movable hinge plate (6), a fixed hinge plate (9) and a rotating shaft (10), wherein one end of the movable hinge plate (6) and the fixed hinge plate (9) are both provided with a mounting groove, the end of the movable hinge plate (6) having the mounting groove is arranged in the mounting groove at one end of the fixed hinge plate (9), and the rotating shaft (10) penetrates the movable hinge plate (6) and the fixed hinge plate (9), the rotating shaft (10) is limited by a retaining ring (7), a magnetostrictive body (12) and a coil (11) are sequentially sleeved on the rotating shaft (10) from the inside to the outside, the rotating shaft (10) is clamped with the fixed hinge plate (9) and the magnetostrictive body (12), the rotating shaft (10) is rotatably connected with the movable hinge plate (6), and the magnetostrictive body (12) is expanded by energizing the coil (11) to limit the rotation of the movable hinge plate (6) relative to the fixed hinge plate (9).

2. The forklift side door hinge capable of hovering at any point within the opening and closing range according to claim 1, characterized in that: A thrust washer (8) is also provided between the movable hinge plate (6) and the fixed hinge plate (9).

3. The forklift side door hinge capable of hovering at any point within the opening and closing range according to claim 1, characterized in that: A tongue plate (4) is fixedly provided at one end of the movable hinge plate (6) away from the fixed hinge plate (9), a locking bracket (3) is provided on the tongue plate (4), the locking bracket (3) is fixedly connected to a fixed plate (5), and a locking bolt (1) and a locking nut (2) are also provided on the locking bracket (3) for fixing the distance between the movable hinge plate (6) and the fixed plate (5).

4. A forklift, characterized in that: The invention comprises a forklift side door hinge capable of hovering at any point within the opening and closing range as described in any one of claims 1 to 3.

5. The forklift according to claim 4, characterized in that: The fixed hinge plate (9) is fixed to a rear leg (13) of an overhead guard of a forklift, the fixed plate (5) on the movable hinge plate (6) is fixed to a cab side door (14) of the forklift, and the coil (11) is connected to a power supply of the forklift.

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