JP3153993B1 - Hydraulic lifting equipment - Google Patents

Abstract

An oil passage base for manual operation and electric operation (24)
By simply selecting (52), manual and electric specifications can be changed to improve assembly workability and simplify parts management. SOLUTION: A hydraulic lift cylinder (12) is erected on the upper surface of an oil passage base (24) (52), and a piston (13) is moved in and out of the hydraulic lift cylinder (12) to raise and lower the loading platform (1). In the lift device, an oil passage base (24) provided with a manual hydraulic pump (25) and an oil passage base (52) provided with an electric hydraulic pump (51) are interchangeably mounted on the hydraulic lift cylinder (12). It is characterized by comprising.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic lift device which is mounted on a mast, for example, a lift truck for loading and unloading cargo which is mounted on a mast.

[0002]

Conventionally, there is a lift truck in which a hydraulic lift cylinder is erected between a pair of left and right masts, and a loading platform to be lifted by the hydraulic lift cylinder is mounted between the left and right masts so as to be able to move up and down. However, a plunger-type manual hydraulic pump and the lift cylinder are welded and fixed to the upper surface of an oil passage base to constitute a lift truck for manual operation, and an electric hydraulic pump and an oil tank are electrically connected to the lift cylinder by hydraulic piping. That lift trucks must be manufactured separately for manual operation and for electric operation, which reduces the manufacturing cost and makes it difficult to change specifications between manual and electric. There is.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a hydraulic lift apparatus in which a hydraulic lift cylinder is erected on the upper surface of an oil passage base, and a piston is moved in and out of the hydraulic lift cylinder to raise and lower a carrier mounted on a mast. At the hydraulic lift
The lower end of the cylinder is detachably screwed and fixed to the oil passage base.
And attach / detach the cylinder head to the top of the hydraulic lift cylinder
Freely screw and fix, insert hydraulic lift cylinder
Detachable oil tank between oil passage base and cylinder head
At both ends of the hydraulic lift cylinder.
Simply screw the oil path base and cylinder head to
The oil tank can be fixed integrally to the outside of the lift cylinder,
Hydraulic lift cylinder and assembly of oil tank and oil passage base
Improved workability and simplified oil tank fixing structure
It is intended to obtain Ri readily FIG.

Further , a lever base is fixed to the oil passage base,
Attach the pumping lever to the lever base and
It is equipped with a runner type manual hydraulic pump.
Unit with pump, pumping lever and manual hydraulic pump
Can be attached to and detached from the hydraulic lift cylinder.
Fix the lever base to the link and attach the pumping lever
Simplification of oil tank shape and ease of assembly
And the like can be easily improved .

Further , an electric hydraulic pump is provided on the upper surface of the oil passage base.
The electric motor is mounted on the top of the electric hydraulic pump.
So the electric motor through the hydraulic pump and the top of the oil passage base
The hydraulic pump and
And the front and rear and left and right width of the electric motor mounting space are compact.
And can be vertically oriented parallel to the hydraulic lift cylinder.
Hydraulic pump and electric motor are arranged to cause collision etc.
Damage can be easily prevented .

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a lift truck, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof. A hand truck (1) for loading luggage and a pair of left and right wheels for mounting the hand truck (1) vertically. A mast (2) and a pair of left and right leg frames (4) for supporting a pair of left and right front wheels (3) are formed by a hollow pipe made of an aluminum alloy, and the mast (2) is erected substantially vertically. The trolley frame (5) is formed by molding an aluminum alloy casting, and a pair of left and right rear wheels (6) are attached to the trolley frame (5) and disposed on the rear side of the lower end of the mast (2).

A handle (7) is fixed to the upper surface of the upper frame (8), and the upper ends of the pair of left and right masts (2) are connected by screws using the upper frame (8). And a pair of left and right guide rollers (10) made of synthetic resin are rotatably supported on both sides at the rear of the lift frame (9), and guide grooves formed on the inner surface of the mast (2). (11)
A guide roller (10) is rotatably fitted into the arm, and a vertically movable frame (9) is mounted between the left and right masts (2) so as to be vertically movable by two sets of four left and right guide rollers (10).

Furthermore, a single-acting hydraulic lift cylinder (12) is erected and fixed between the left and right masts (2) substantially at the center of the upper surface of the bogie frame (5), and the upper end of the piston (13) of the cylinder (12) A pulley (15) is mounted on the lifting frame (9) via a pulley stand (14), and an intermediate load wire (16) for fixing one end to the lifting frame (9) is stretched around the pulley (15) and stretched. The pulley (15) is moved up and down by moving in and out to move the lifting frame (9) up and down. Further, the both ends of the beam frame (17) are fixed between the left and right masts (2), and the beam frame (17) is fixed.
The upper end of the cylinder (13) and the load wire (16)
The other end is bolted and fixed.

A pair of left and right front and rear rolling wheels (18) (1) capable of changing directions are provided on the lower surface of the wheelbarrow (1) which forms a loading platform.
9), a hook plate (20) and a hand push handle (21) are fixed to the back of the wheelbarrow (1), and the hook plate (2) is attached to the lifting frame (9) via a pin (22).
0) is detachably locked, and the handcart (1) is detachably fixed to the lifting frame (9).

Further, a mast table (23) is fixed on the upper surface of the carriage frame (5), and the lower ends of the left and right masts (2) are fixed to the mast table (23).
3) The lower surface of the oil passage base (24) is detachably bolted and fixed to the upper surface, and the hydraulic lift cylinder (12) and the plunger type manual hydraulic pump (25) are connected to the oil passage base (2).
4) Provide on the upper surface.

As shown in FIGS. 4 to 6, an oil passage base (2
4) The lower end of the lift cylinder (12) is detachably fixed to the upper surface side with screws (26), and the lift cylinder (12) is erected on the oil passage base (24). Insert the cylindrical oil tank (2
8) The lower end side is detachably fitted, and the lift cylinder (12) is inserted into the oil tank (28). Further, the lower end of the cylinder head (29) is detachably fixed to the upper end of the lift cylinder (12) with screws (30), and the fitting part (31) in the middle of the cylinder head (29) is connected to the upper end of the oil tank (28). And the piston (13) is inserted into the lift cylinder (12) from the upper end side of the cylinder head (29) so as to be freely inserted and removed. In addition, the lift cylinder (12) is short-circuited to the oil tank (28) via the pressure release path (32) at the lower end of the piston (13) and the pressure release port (33) of the cylinder head (29), and the piston (13) Hydraulic advance is restricted to prevent falling off.

Further, a lever stand (34) is erected and fixed on the upper surface side of the oil passage base (24), and a pressure release lever (35) and a manual hydraulic pressure are provided on the upper surface of the oil passage base (24) surrounded by the lever stand (34). A pumping lever (3) having a pump (25) standing up and a foldable foot pedal (36).
7) is rotatably mounted on a lever base (34) via a fulcrum shaft (38), and a pressure roller (40) of a pumping lever (37) is applied to the plunger (39) head of a manual hydraulic pump (25). The plunger (39) is raised and lowered by stepping on the lever (37), and the lower end of the plunger (39) is inserted into the manual hydraulic pump (2).
The body cylinder (41) of 5) is detachably fixed to the oil passage base (24) with screws (42). The lift cylinder (12) and the manual hydraulic pump (25) are screwed (26).
(42) fixed to the oil passage base (24) by a stop,
The oil passage base (24) is formed of an aluminum lightweight alloy to reduce the weight and simplify the drilling process.

Further, as shown in FIGS. 7 to 9, a suction valve (43) for supplying hydraulic oil of an oil tank (28) to a manual hydraulic pump (25), and a high pressure oil from the pump (25) are lifted by a lift cylinder. A discharge valve (44) to be sent to the oil passage base (24) and a relief valve (45) for setting a lift cylinder (12) ascending operation maximum load are provided on the oil passage base (24). Each of the valves (43) (4) is connected to the pump port (46) to be formed.
4) Connect (45) to the oil path. A lift cylinder (1) which is opened and closed by operating the pressure release lever (35).
2) Lower the pressure release valve for lowering operation (47) with the oil passage base (2
4), the valves (43), (45), (47) are connected to a tank port (48) formed in an oil passage base (24) by an oil passage, and a lift cylinder is opened by opening a pressure relief valve (47). An elevating frame (9) for lowering the (12) is provided with a descent prevention valve (49) for adjusting the descent speed to be adjustable in the oil passage base (24), and a discharge valve (44) and a pressure relief valve (47). Is connected to the cylinder port (50) of the oil passage base (24) via the sudden drop prevention valve (49). Then, by operating the foot pedal (36), the oil in the oil tank (28) is pumped from the manual hydraulic pump (25) to the lift cylinder (12) to raise the lifting frame (9), while the pressure release lever ( 35) The depressurizing valve (47) is opened by the rotation operation, and the oil of the lift cylinder (12) is released from the tank (28).
The lift frame (9) is returned by lowering the lift cylinder (9), and constitutes a lift truck for manual operation in which the lift cylinder (12) is manually driven upward by a manual hydraulic pump (25).

Further, in FIGS. 10 to 14, a gear pump type electric hydraulic pump (51) is provided in place of the manual hydraulic pump (25), and the lift cylinder (12) is electrically operated using the electric hydraulic pump (51). The electric hydraulic pump (51) is detachably bolted and fixed to the upper surface of the oil passage base (52), and the electric hydraulic pump (51) is electrically driven to the upper surface of the electric hydraulic pump (51). The motor (53) is bolted and fixed, and the hydraulic pump (51) is driven by the electric motor (53). Similarly to the above embodiment, the lower surface of the oil passage base (51) is detachably bolted and fixed to the upper surface of the mast table (23), and the lift cylinder (1) is mounted to the upper surface of the oil passage base (51).
2) The lower end is detachably fixed with a screw (26), and the lower end of the oil tank (28) is detachably fitted into a circular opening (27) formed on the upper surface of the oil passage base (51), as shown in FIG. A lift cylinder (12) and an oil tank (28) having the same specifications as those of the above-described embodiment have the same mounting structure and an oil passage base (52).
The hydraulic cylinder base (24) provided with a manual hydraulic pump (25) and the hydraulic path base (52) provided with an electric hydraulic pump (51) are exchanged to lift cylinder (12). The lift truck for manual operation and the lift truck for electric operation can be assembled by using other parts such as these.

As is apparent from the above description, the hydraulic lift cylinder (12) is erected on the upper surface of the oil passage base (24) (52), and the piston (1) is placed above the hydraulic lift cylinder (12).
3) In a hydraulic lift device for raising and lowering the wheelbarrow carrier (1) into and out of which, the oil passage base (24) provided with a manual hydraulic pump (25) and the oil passage base (24) provided with an electric hydraulic pump (51). 52) is interchangeably attached to the hydraulic lift cylinder (12). Then, the manual and electric hydraulic pumps (25) and (51) are selectively fixed to the hydraulic lift cylinder (12) having the same shape and structure to increase the number of common parts for manual operation and electric operation. In addition to reducing costs, manual and electric specifications can be changed simply by selecting the manual and electric oil passage bases (24) and (52) during assembly to improve assembly workability and simplify parts management. In addition, even after shipment as a product, manual and electric specifications can be changed by replacing the oil passage bases (24) and (52).

The lower end of the hydraulic lift cylinder (12) is detachably screwed and fixed to the oil passage bases (24) and (52), and the cylinder head (29) is detachably mounted on the upper end of the hydraulic lift cylinder (12). An oil tank (28) in which the hydraulic lift cylinder (12) is inserted is fixed between the oil passage bases (24) and (52) and the cylinder head (29) in a detachable manner. The hydraulic lift cylinder (1) is screwed into the oil passage bases (24) (52) and the cylinder head (29) at both ends of the hydraulic lift cylinder (1).
An oil tank (28) is integrally fixed to the outside of 2) to improve the workability of assembling and disassembling the hydraulic lift cylinder (12), the oil tank (28) and the oil passage bases (24) (52), and improve the oil tank (28). 28) To simplify the fixing structure and the like.

The lever base (3) is attached to the oil passage base (24).
4) is fixed, the pumping lever (37) is attached to the lever base (34), the plunger type manual hydraulic pump (25) is attached to the oil passage base (24), and the oil passage base (24)
And pumping lever (37) and manual hydraulic pump (25)
The oil tank (28) is compared with a conventional structure in which the pump is mounted on a hydraulic lift cylinder (12) and attached to and detached from the hydraulic lift cylinder (12).
The simplification of the shape and the improvement of the assembling workability are aimed at.

An electric hydraulic pump (51) is mounted on the upper surface of the oil passage base (52), an electric motor (53) is mounted on the upper surface of the electric hydraulic pump (51), and the electric motor (53) is connected via the hydraulic pump (51). ) Are stacked and fixed on the upper surface of the oil passage base (52) in a multi-layer form, and the front, rear, left and right widths of the mounting space for the hydraulic pump (51) and the electric motor (53) are formed compactly, and are parallel to the hydraulic lift cylinder (12). A hydraulic pump (51) and an electric motor (53) are vertically arranged to prevent damage due to collision or the like.

Further, as shown in FIGS. 12 to 14, a suction port (54) for supplying hydraulic oil from an oil tank (28) to an electric hydraulic pump (51), and a high pressure oil from the pump (51) to a lift cylinder. The oil passage base (52) is provided with a discharge valve (55) to be sent out to the oil passage base (52) and a relief valve (56) for setting a maximum lifting operation load of the lift cylinder (12). Each of the valves (55) (5) is connected to the discharge port (57) to be formed.
6) is connected to the oil passage. Further, the pressure release lever (35)
A lift cylinder (12), which is opened and closed by an operation, is provided with a pressure relief valve (58) for lowering operation on the oil passage base (52),
Tank port (59) formed in oil passage base (52)
(60) The suction port (54) and each valve (56)
(58) is connected to the oil passage and the pressure relief valve (58)
An elevating frame (9) for lowering the lift cylinder (12) by the opening operation is provided with a descent prevention valve (61) for adjusting the descent speed in the oil passage base (52). The extraction valve (58) is connected to the cylinder port (62) of the oil passage base (52) via the sudden drop prevention valve (61). The oil tank (28) is turned on by turning on a lift switch (63) for connecting the battery (62) to the electric motor (53).
Oil from the electric hydraulic pump (52) to the lift cylinder (1)
2) to raise the lifting frame (9)
Depressurizing valve (5) by rotating depressurizing lever (35)
8) is opened, the oil in the lift cylinder (12) is returned to the tank (28) and the lifting frame (9) is lowered, and the lift cylinder (12) is electrically driven up using the electric hydraulic pump (52). A lift truck for electric operation to be driven is configured. The battery (62) and the lift switch (63) may be mounted on the outer surface of the mast (2), or may be mounted on a handle (7) for pushing and pulling operation. In addition, although the wheelbarrow (1) is detachably provided on the lifting frame (9) as a loading platform, a loading platform such as a two-part fork or a table may be detachably or integrally provided on the lifting frame (9). .

[0020]

As is apparent from the above embodiment, the present invention provides a hydraulic lift cylinder (12) with an oil passage base (24).
(52) The hydraulic lift cylinder (12) which is erected on the upper surface
In a hydraulic lift device for moving a loading bed (1) mounted on a mast (2) by moving a piston (13) upward and downward, a lower end of a hydraulic lift cylinder (12) is connected to an oil passage base.
(24 ) A hydraulic lift is fixed by detachably fixing to (52)
Cylinder head (29) at the upper end of the cylinder (12)
Removably screwed and fixed, hydraulic lift cylinder (12)
Oil tank (28) to interpolate oil passage base (24)
(52) and cylinder head (29)
It is fixed and held by both hydraulic lift cylinders (12).
Oil passage bases (24) (52) and cylinder head at the end
The hydraulic lift cylinder (1
2) The oil tank (28) can be fixed integrally to the outside of
Pressure lift cylinder (12) and oil tank (28) and oil passage
Improvement of workability of assembling and disassembling bases (24) and (52) and
The oil tank (28) fixing structure can be easily simplified .

The lever base (3) is attached to the oil passage base (24).
4) Fix the pumping lever (37) to the lever base.
(34), plunger type on oil passage base (24)
It is equipped with a manual hydraulic pump (25).
(24), pumping lever (37) and manual hydraulic pump
The hydraulic lift cylinder (1) is configured as a unit of (25).
2) The lever base can be fixed to the oil tank like the conventional one.
Oil pump compared to the structure where the pumping lever is
This facilitates the simplification of the shape of the link (28) and the improvement of the assembling workability .

The electric hydraulic pressure is placed on the upper surface of the oil passage base (52).
Attach the pump (51), the upper surface of the electric hydraulic pump (51)
With an electric motor (53) attached to it
The electric motor (53) is connected to the oil passage base (5) through (51).
2) The hydraulic pressure is increased by stacking and fixing
Pump (51) and electric motor (53) mounting space
The front and rear and left and right widths can be made compact, and the hydraulic lift
Hydraulic pump (51) vertically long in parallel with the cylinder (12)
And electric motor (53) to dispose of
It is possible to easily prevent scratches .

[Brief description of the drawings]

FIG. 1 is a side view of a lift truck.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged explanatory view of the same plane.

FIG. 4 is an exploded view of the lift cylinder.

FIG. 5 is an explanatory view of mounting a manual hydraulic pump.

FIG. 6 is an enlarged view of FIG.

FIG. 7 is a plan view of an oil passage base for manual operation.

FIG. 8 is an explanatory plan view of the same.

FIG. 9 is a hydraulic circuit diagram for manual operation.

FIG. 10 is an explanatory view of mounting an electric hydraulic pump.

FIG. 11 is an enlarged view of FIG.

FIG. 12 is a plan view of an oil passage base for electric operation.

FIG. 13 is an explanatory plan view of the same.

FIG. 14 is a hydraulic circuit diagram for electric operation.

[Explanation of symbols]

 (1) Wheelbarrow (loading bed) (2) Mast (12) Hydraulic lift cylinder (13) Piston (23) Mast table (24) (52) Oil passage base (25) Manual hydraulic pump (28) Oil tank (29) Cylinder head (34) Lever base (37) Pumping lever (51) Electric hydraulic pump (53) Electric motor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B66F 9/06, 9/22

Claims (3)

(57) [Claims] 1. A hydraulic lift cylinder (12) is erected on an upper surface of an oil passage base (24) (52), and a piston (13) is moved in and out of the hydraulic lift cylinder (12) to be mounted on a mast (2). In a hydraulic lift device for lifting and lowering a loading platform (1), a lower end of a hydraulic lift cylinder (12) is connected to an oil passage.
The base (24) and (52) are detachably screwed and fixed to the base, and oil
Cylinder head (2) at upper end of pressure lift cylinder (12)
9) Removably screw and fix the hydraulic lift cylinder
The oil tank (28) for interpolating (12) is oil path base
(24) Detachable between (52) and cylinder head (29)
A hydraulic lift device characterized by being freely pinched and fixed . 2. A lever base (34) on an oil passage base (24).
And fix the pumping lever (37) to the lever base (3).
4) Attached to the oil passage base (24), and a plunger type manual
The hydraulic lift device according to claim 1, wherein a hydraulic pump (25) is mounted . 3. An electric hydraulic pump on an upper surface of an oil passage base (52).
Pump (51), and apply electric power to the upper surface of the electric hydraulic pump (51).
2. A motor according to claim 1, further comprising a motor.
The hydraulic lift device according to claim 1.