JPS6374889A - Hydraulic cylinder for container spreader - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a container spreader used by being attached to a lift filter structure of a forklift truck or the like.

[Conventional technology]

Spreaders are used as attachments for lifting containers and the like with forklift trucks. In such a container spreader, a twist lock pin supported rotatably around an axis by a twist lock beam is inserted into an engagement hole formed in the ceiling of the container, and the twist lock pin is inserted into the engagement hole. By rotating the container, it engages with the engagement hole, making it possible to fish the container.

One of the twist lock beams of a conventional container spreader
An exploded perspective view of the example is shown in FIG. 3, a plan view of the main part thereof is shown in FIG. 4, and a sectional view is shown in FIG. 5.

A hollow twist lock pin holder 2G is provided in two twist lock boxes 27 formed integrally with the twist lock beam and spaced apart from each other.

A shaft having a twist lock pin 28 at its lower end is inserted into a hollow hole of a twist lock pin holder 26, and a twist lock arm 23 is attached to its upper end.

Two twist lock arms 23 are connected to each other by a pin 24 and a twist lock rod 22, and one twist lock arm 23 is further connected to a twist lock cylinder 21.

The rear end of the twist lock cylinder 21 is pivotally supported by a twist lock beam, and the rod is moved back and forth by hydraulic pressure to directly connect the left twist lock arm 23 and, via the twist lock rod 22, to the right twist lock arm. The lock arms 23 are each rotated approximately 90'' to engage the twist lock pins 28 in the engagement holes of the container.

(Problems to be Solved by the Invention) As mentioned above, the conventional twist lock device for a container spreader has an extremely large number of parts as shown in FIG.
As a result, there are many parts that are mechanically worn out when the twist lock is activated. Furthermore, since there are many worn parts, there are also many nipples for lubricating, and the locations where they are installed are extremely difficult to lubricate.

In view of these points, the present invention simplifies the operating mechanism by reducing the number of component parts, and also reduces the wear parts.
The purpose is to reduce the weight of the entire container spreader and to facilitate its maintenance.

[Means for solving problems]

In the present invention, the above object is achieved by providing a rotating shaft equipped with a pressure receiving vane in the center of a cylinder chamber surrounded by an arcuate wall surface, opening a hydraulic oil supply and draining port in the cylinder chamber, This is achieved by a container spreader hydraulic cylinder having a container spreader twist lock pin attached to the rotating shaft.

[Effect]

In the present invention, each twist lock box is provided with a torque cylinder that rotates the rod using hydraulic pressure. Therefore, there is no need to mechanically connect both twist lock pins, the number of parts can be significantly reduced, and the mm of the twist lock beam can be reduced.

Furthermore, since the number of worn parts is reduced due to the reduction in the number of parts, the number of grease nipples is also reduced, making maintenance easier.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples. 1st
The figure is a sectional view of a main part of a hydraulic cylinder for a container spreader according to the present invention, and FIG. 2 is a sectional view taken along the line π-■ in FIG. 1.

A container spreader cylinder of the present invention is attached to each twist lock box portion of the twist lock beam 2 by bolts 3.

The cylinder for the container spreader is attached to the upper and lower bottom plates 4a, 4.
b, consisting of a cylindrical body 5 having an arc-shaped wall surface 59 (see FIG. 2), and seal plates 7a and 7b provided between the bottom plates 4a and 4b and the cylindrical body 5, which are hermetically fastened with bolts 15. A cylinder chamber is formed inside.

As shown in FIG. 2, the cylinder chamber of this embodiment has partition walls 5e,
It consists of two chambers divided symmetrically around the central axis by 5f, but it may be one chamber or may have three or more chambers.

A protrusion 5 protruding into the cylinder chamber from the arcuate wall surface 5g
a, 5b, 5c, and 5d are pressure receiving vanes 12b, which will be described later;
12c swing! It acts as a stopper that restricts the 111 range.

The hollow shaft 11 with a circular cross section has an outer diameter that gradually increases from the lower part to the upper part with the shoulder as a boundary, and the outer diameter of the hollow shaft 11 gradually increases from the bottom to the top.
The shoulder portion of the hollow shaft 11 is rotatably supported by bearings 9.10 installed in the bearings 9.10, and an oil seal 16 is mounted on the outside of each bearing 9.10 in the axial direction.

A spline 11a is formed on the outer periphery of the portion of the hollow shaft 11 facing the cylinder chamber.

A plate-shaped pressure receiving vane 12 extends radially on the circumferential surface of the cylinder.
b, 12c are formed, and a spline 12a is formed on the inner peripheral portion to form the outer shell body 12.

The splines 12a of the outer shell 12 are engaged with the splines 11a of the hollow shaft 11, and the outer shell 12 and the hollow shaft 11 rotate together around the central axis.

What is the length of the pressure receiving vanes 12b and 12c so that their tips are located on the arcuate inner wall surface 5Q of the cylinder chamber? It is set to have a tight fit. Further, the widths of the pressure receiving vanes 12b and 12c are set so that the pressure vanes 12b and 12c are liquid-rich with the seal plates 7a and 7b.

The pressure receiving vanes 12b and 12C are respectively mounted between the protrusions 5a and 5b and the protrusion 5C15d protruding into the cylinder chamber, and are rotatable therebetween.

The inside of the cylinder chamber is divided into two parts by the pressure receiving vanes 12b and i2c, and the outer side in the circumferential direction of the swinging range of the pressure receiving vanes 12b and 12c, that is, the protrusions 5a, 5b, and 5c.
, 5d, a hydraulic oil supply/drainage port 4C14d is opened. Each oil supply/drainage port 4c, 4d is a nipple 14a, 1
4b to a hydraulic oil supply source (not shown).

When hydraulic oil is supplied from the oil supply and discharge port 4C and is discharged from the oil supply and discharge port 4d, the pressure receiving vanes 12b and 12C rotate in the direction shown by the arrow in FIG. 2. When the supply and discharge of hydraulic oil are reversed, the pressure receiving vanes 12b and 12C rotate in the opposite direction to the above-mentioned direction. The hollow shaft 11 rotates together with the pressure receiving vanes 12b and 12c, and the rotation of the hollow shaft 11 is extracted by the twist lock pin 28 as follows.

That is, a spline 11b is formed in the hollow part of the hollow shaft 11, a spline 6b is formed in the shaft 6 connected to the twist lock pin 28, and both splines 11b, 6 are formed.
b are engaged so that the hollow shaft 11 and the shaft 6 rotate integrally, and some relative movement in the axial direction between the hollow shaft 11 and the shaft 6 is allowed.

Screw the grooved nut 8 into the screw 6C formed on the head of the shaft 6, insert the bottle 13 into the groove of the grooved nut 8, fix the grooved nut 8 in a predetermined position, and move the shaft 6 downward. The amount is regulated. In addition, a shoulder portion 6a of a cylindrical portion 6a formed on the shaft 6
a engages with the twist lock beam 2 to restrict the amount of upward movement of the shaft 6.

In the hydraulic cylinder of the container spreader having the above configuration, the twist bottle 28 attached to the tip of the shaft 6 is inserted into the engagement hole (not shown) formed in the ceiling of the container, and Supply hydraulic oil from 4C, oil supply and drain port 4
The hydraulic oil is discharged from d, and the pressure receiving vanes 12b and 12c are rotated in the direction shown by the arrow in FIG. Pressure receiving vane 12b
, 12C is transmitted from the hollow shaft 12 through the splined shaft 6 to the twist lock pin 28, which rotates within the engagement hole of the container and engages with the engagement hole. Therefore, containers can be fished out.

When releasing the container from the twist lock pin 28, the supply and discharge of hydraulic oil are reversed as described above, the pressure receiving vanes 12b and 12c rotate in the opposite direction to the above direction, and the twist lock pin 28 is inserted into the engagement hole. deviate from

(Effects of the Invention) In the present invention, each twist lock box is provided with a torque cylinder that rotates the rond using hydraulic pressure. Therefore, there is no need to mechanically connect both twist lock pins, the number of parts can be significantly reduced, and the weight on the twist lock member can be reduced. On the other hand, if the weight of the twist lock beam is the same as the conventional one, the rigidity of the twist lock beam can be further increased.

Furthermore, since the number of worn parts is reduced due to the reduction in the number of parts, the number of grease nipples is also reduced, making maintenance easier.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of a container spreader according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is an exploded perspective view of an example of a twist lock beam of a conventional container spreader. 4 is a plan view of the main part of FIG. 3, and FIG. 5 is a sectional view of FIG. 4. 4C14d...Hydraulic oil supply/drain port, 5g...Circular wall surface, 6...Shaft, 11...Hollow shaft, 12a, 12b...Pressure vane, 28...Twist lock pin

Claims (1)

[Claims] 1. A rotating shaft equipped with a pressure receiving vane is provided at the center of a cylinder chamber surrounded by an arcuate wall surface, a hydraulic oil supply and drain port is opened in the cylinder chamber, and a container spreader is attached to the rotating shaft. A hydraulic cylinder for container spreaders, which is equipped with a twist lock pin.