JPS63145147A - Front arm structure of loading vehicle - Google Patents

Abstract

PURPOSE:To increase the buckling strength by forming a lift arm for horizontally supporting a container for a loading vehicle for aerocontainer into a box structure which is formed by joining a member which has a U-shaped section and has a cut part in the longitudinal direction at the center and a T-shaped member having a reinforced part engage with the cut part. CONSTITUTION:A front arm 5 used for a loading vehicle which can be raised and lowered, horizontally supporting an aerocontainer, etc. has a hook part at the upper edge, and the hook can be operated freely by a hook cylinder 18 installed onto the side part of the arm 5, and said arm 5 supports a container and performs loading work. The arm 5 has a box structure having a rectangular section which is formed by the welding A-D of a member 23 which has a U-shaped section and has a cut part 28 in the longitudinal direction at the center and a T-shaped member 25 having a reinforced part 27 engage with the cut part 28. The stress applied onto the lift arm 5 can be dispersed, and the buckling strength can be increased, and the safe loading work is permitted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a front arm structure of a cargo handling vehicle, and more specifically, when a container detachably supported by a lift arm is loaded onto or unloaded from a vehicle body. This invention relates to a reinforcement structure for the hook cylinder mounting portion of the front arm that maintains its posture.

[Prior art]

Some of the cargo handling vehicles shown in FIG. 10 that transport containers 1 are equipped with a cargo handling device 2 for loading and unloading containers onto and from the vehicle body. In order to handle a container with the cargo handling device 2, it is necessary to support the container 1, and support shafts 3 are protruded from the left and right sides of the container 1. In the cargo handling device 2 for receiving the support shaft 3, a pair of left and right lift arms 5 each having a support portion 4 are attached to the vehicle body 6 via a lift cylinder 7 and a support shaft 8 so as to be rotatable forward and backward. It will be done. A rotatable front arm 9 is provided at the front center of the vehicle body 6 to maintain the attitude of the container 1 during forward and backward rotation. It is formed in the shape of a "<" character, and a hook 10 is attached to the top end of the hook 10 to hold and release the posture holding member 11 at the top of the front end of the container 1. The front arm 9 is attached to the vehicle body 6 via a support shaft 12 serving as a center of rotation, and connected to an auxiliary cylinder 14 swingably mounted on a pin shaft 13.

The line connecting the support shaft 8 of the lift arm 5 and the support shaft 12 of the front arm 9 and the line connecting the posture holding member 11 and the support shaft 3 form two opposing sides of a parallelogram,
Furthermore, since the line connecting the support shaft 12 and the posture holding member 11 and the line connecting the support shaft 8 and the support shaft 3 form the other two sides of the parallelogram, the lift arm 5 and the front It rotates at the same angle as the arm 9, so that the container l can be loaded and unloaded while always keeping its attitude horizontal.

As shown in FIG. 11(a), a fixing hook 16 having a recess 15 is provided at the upper end of the front arm 9. As shown in FIG. A hook cylinder 18 for rotating the swinging hook 17 is attached to the back of the hook cylinder 18, and a recess 15 of the fixed hook 16
The two left and right swinging hooks 17 that open and close the fixed hook 1
It is attached via support shafts 19 that protrude from the left and right sides of the body of No. 6.

When such a hook 10 supports the posture holding member 11, the front arm 9 rotates forward and backward together with the lift arm 5.

[Problem that the invention seeks to solve]

By the way, when the container 1 shown by the solid line in FIG. A part of the weight of the container 1 acts on the hook 10 of the container 9.

For example, when the center of gravity of the container 1 is located in front of the support shaft 3 in the state indicated by the dashed line, the posture holding member 11 appears to be resting on the fixed lever 16 as shown in FIG. 11(a). The load W is transmitted almost uniformly to the front arm 9 via the backing plate 2'O that closes the upper end of the box structure. Since the front arm 9 has a box structure that does not buckle under the load, there is almost no problem even if the unbalanced load of the container 1 acts on it. On the other hand, when the container 1 is unloaded on the ground, the front arm 9
The posture is as shown in FIG. 11(b), and the posture holding member 1
1 is placed on the swinging hook 17. The load W is the swinging hook 1
7 about the support shaft 19 in the direction of the arrow 21A. Since the footer cylinder 18 maintains the extended state to maintain the position of the swinging hook 17, the load acting on the swinging hook 17 is transmitted via the hook cylinder 18 to the mounting bracket 22 of the hook cylinder.

In this case, the transmitted force is concentrated in the component 23 forming the box structure in the front arm 9. The front surface of the component 23 is flat and has a reinforcing face plate 24 as shown.
Even if , the force of the arrow 21B tends to cause deformation in that part as shown by the two-dot chain line.

In order to prevent such buckling deformation, the box structure of the front arm 9 may be reinforced.

A hook cylinder 18 for rotating the swing hook 17 is attached to a component 23 forming the front surface of the box structure. Therefore, in order to effectively reinforce the component 23, the component 23 and another component 25 located at a position facing it may be connected so as to be supported by a plate member (not shown).

However, it is not easy to insert reinforcing plates into the box structure and weld them together. That is, when attaching a plate material after the box structure is formed by the component member 23 and the other component member 25, the fitted plate materials are welded at the abutting points within the box. In this case, the welding rod cannot reach deep parts of the closed cross section, it is difficult to weld in a narrow space, and it is difficult to maintain high welding quality.Also, it takes time and effort to inspect the finished state, which increases the manufacturing man-hours. There is a problem with the increase in On the other hand, there are cases where the plate material is welded to one component before the box structure is formed, but even in that case, welding to the other component is done after the box structure is formed, so it is the same as above. This will cause welding problems.

The present invention has been made to solve the above-mentioned problems.
The purpose of this is to provide a reinforcing member to prevent the attachment part of the hook cylinder from deforming due to the force acting on the swinging hook when holding the container in a desired position during loading and unloading, and to ensure that the welding is complete. To provide a front arm structure for a cargo handling vehicle that can be easily welded and the strength of a hook cylinder attachment part can be improved.

[Means for solving problems]

The features of the front arm structure of a cargo handling vehicle according to the present invention will be explained with reference to FIGS. 1(a) to 1(d) and FIG. 10. A removable container 1 is supported by a pair of lift arms 5 provided on the left and right sides of a vehicle body 6, and the lift arms 5 are swung back and forth by the operation of a lift cylinder 7 to load and unload the container 1. In order to maintain the attitude of the container 1 during loading and unloading, a front arm 9 that supports an attitude holding member 11 provided at the upper front end of the container 1 is rotatably attached to the vehicle body 6. At the tip of the front arm 9, there is a posture holding member 1 for the container 1.
1, and a swinging hook 17 that opens and closes the recess 15 to hold and release the posture holding member 11. The front arm 9 has a box structure with a rectangular cross section, and a hook cylinder 18 for rotating the swinging hook 17 is attached to one of the constituent members forming the box structure, and the hook cylinder 18 that rotates the swinging hook 17 is attached to the constituent member 23 and the A reinforcing member 27 is interposed between the structural member 25 and the reinforcing member 27 to connect them. A notch 28 through which a reinforcing member 77 is inserted is formed in either one of the component members 23 and 25, and one end of the reinforcing member 27 is welded to the component member 25 without a notch in a T-shape. The other end is welded to the outside of the component 23 inserted through the notch 28.

In the second invention, with reference to FIGS. 9(a) and 9(b), notches 30, 30 through which the reinforcing member 27 is inserted are formed in the component 23.25, and the reinforcing member 27 Both end sides of are welded on the outside of the component that passes through each notch 30.

[For production]

A reinforcing member 27 is interposed between the structural member 23 to which the hook cylinder 18 is attached and another structural member 25 facing thereto so as to bridge them. A notch 28 through which a reinforcing member 27 is inserted is formed in one of the structural members 23 and 25, and one end of the reinforcing member 27 is welded against the structural member without the notch.

On the other hand, the other end is welded on the outside of the component inserted through the notch 28. In the second invention, the component 23.25
A notch 30 is formed in which the reinforcing member 27 is inserted,
Both ends of the reinforcing member 27 are welded on the outside of the component 23, 25 inserted through each notch 30. Welding the outside of the notch 30 is extremely easy and reliable. The welding of the single-shaped reinforcing member 27 in a component without a notch 28 can be welded before forming the box structure, so the welding can be done in an open state, which is also an extremely easy welding operation. In this way, the image component 2
3.25, the strength and rigidity of the hook cylinder attachment portion of the box-structured front arm 9 is increased.

When loading or unloading a container 1 whose center of gravity is forward or backward relative to the support shaft 3 due to unevenness of the contents, a portion of the load of the container 1 acts on the front arm 9 from the posture maintaining member 11 . When the front arm 9 rotates forward and backward, the posture of the hook 10 changes, so the posture holding member 11, which is supported by fitting into the recess 15 of the fixed hook 16, comes into contact with the fixed hook 16 or the swinging hook 17. . The force applied to the swinging hook acts on the component 23 of the front arm 9 via the hook cylinder 18. A reinforcing member 27 is interposed between the structural member 23 and the opposing structural member 25, and the reinforcement member 27 supports and distributes the load, preventing deformation of the structural member 23. It will never occur.

〔Effect of the invention〕

In the present invention, even if part of the load of the container acts on the swinging hook that closes the recess of the fixed hook and holds the posture holding member, the force transmitted from the hook cylinder to the structural members of the front arm is absorbed by the reinforcing member. The receiver may be stopped or distributed to other components via it. Therefore, 1
No force is concentrated on one component, and no deformation such as buckling occurs at that location. When inserting the reinforcing member into the image component, there is no welding work within a closed cross section (the welding work is done in an open state, which makes the work extremely easy.The f4 welding accuracy and quality are high. The strength and rigidity of the hook cylinder attachment part are significantly increased.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples thereof.

As shown in FIG. 10, the cargo handling vehicle is capable of loading and unloading a container 1, which can be freely attached to and removed from a cargo handling device 2, onto a vehicle body 6. As described in the prior art section, a front arm 9 is provided at the center front of the vehicle body 6 to maintain the container 1 in a substantially horizontal position during loading and unloading.

Since this front arm 9 is a long arm body as shown in FIGS. 1(a) to (C), it has a box structure forming a closed cross section. The members that form the box are
As shown in FIG. 1(d), it consists of a U-shaped front component 23 and a flat rear component 25. In this example, a hook cylinder 18 for rotating the swing hook 17 is attached to the front component 23.

A notch 28 through which the reinforcing member 27 is inserted is formed in such a component 23. It is formed narrowly in the vertical direction in the center of the area where the hook cylinder 18 is attached,
As shown in FIG. 2, the tip of a reinforcing plate 27 welded to the component 25 in a T-shape can be inserted through it.

As a result, the component 23 and the component 25 opposite thereto
A reinforcing member 27 is bridged between the front arm 9 and the front arm 9, thereby reinforcing the box structure of the front arm 9. As shown in FIG. 1(d), each member is welded together at the abutting part A between one end side of the plate material 27 and the component member 25 without a notch, and the other end side of the component member inserted through the notch 28. Fillet welding is performed on the outside B of 23, respectively. Of course, the constituent members 23 and 25 are also welded, and fillet welding is performed at the abutting portion C thereof. In addition, in this example, in order to reinforce the attachment part of the hook cylinder 18, the reinforced surface! Since Fj, 24 is applied to the component 23, the plate material 27 also passes through the reinforcing face plate 24. In the vicinity of the upper end of the front arm 9, the component 23 and the plate material 27 are welded on the inside of the component 23 within the reach of the welding rod. Finally, a caul plate 20 as shown in FIG. 3 is placed and welded around its lower surface, and the fixing hooks 16 are also welded thereto.

By the way, the above-mentioned reinforcing member 27 is not limited to a plate material, and may itself have a box structure or a truss structure. It is sufficient that the notches 28 have a form in which one end thereof can be inserted and fixed by welding as described above. The bridging connection of the reinforcing member 27 can be made by selecting the most effective position for reinforcement, so if the attachment part of the hook cylinder 18 is lower than the illustrated position, the reinforcing member 27 should be placed at a position away from the backing plate 20. becomes. Since the notch does not need to be open upward as shown in FIG. 3, the reinforcing member 2
The hole may be long enough to allow one end of the hole to pass through.

At the tip of the front arm 9 having the above-described structure, as described above, the fixing hook 16 is integrated with the backing plate 2°, and there is a "co" having a recess 15 into which the posture maintaining member 11 is fitted.
It is shaped like the letter . The swinging hook 17 has a base 17a [
Refer to FIG. 1(a)] and a tip portion 17b bent in the shape of a “re”, and a support shaft 1 protruding from a fixed hook 16.
The left and right two are swingably attached via the shaft 18a.
It is connected to the hook cylinder 18 mounted on the component 23 of the front arm 9 via. As the hook cylinder 18 expands and contracts, the swinging hook 17 rotates about the support shaft 19, and the recess 15 can be opened and closed. In addition,
The reason why the swinging hook 17 opens the recess 15 is to release the posture holding member 11 in order to dump the container 1 on the vehicle as shown in the dashed-dotted line or the dashed-double-dotted line and discharge the contents, as shown in FIG. This is the case when the container 1 on the ground is grabbed for loading as shown by the dashed line in FIG.

According to the structure of the front arm 9 explained above, the plate material 27 which is a reinforcing member is welded to the component member 25 in advance,
The plate material 27 is inserted into the notch 28 while facing the component 23, and the abutting portion C of the component members 23 and 25 is
The plate material 27 and the component member 23 can be welded on the outside B. Therefore, welding work can always be performed in an open state, making it easy to work and inspect, and resulting in high-quality welding.

As a result, the hook cylinder 1 in the front arm 9
8 is reinforced, and deformation such as buckling of the component 23 due to the force transmitted from the swing hook 17 does not occur. Incidentally, as shown in FIG. 1(d), the tip of the plate material 27 protrudes into the mounting portion of the funxilling 18, but there is no problem as long as they do not interfere with each other. Furthermore, if there is a problem, the hook cylinder 18 may be attached to the component 25 as shown in FIG.

6(a) and 6(b) are examples in which a plate material 27 is welded to the U-shaped component 23 in advance.

Therefore, the notch 28 through which the plate material 27 is inserted is formed in the component 2.
5. FIGS. 7(a) and 7(b) show an example in which the structural members 23 and 25 are both flat plates, and side plates 29, 29 for forming a box structure are welded to one of the structural members 23.

FIGS. 8(a) and 8(b) show an example in which the structural members 23 and 25 are both U-shaped, and a plate 27 is welded to one of the structural members 23 in advance.

FIGS. 9(a) and 9(b) show a box structure according to the second invention. The structural members 23 and 2525 are both formed with notches 30, 30 through which the plate material 27 is inserted, and both ends of the plate material 27 are outside E of the structural member 23.25 inserted through each of the notches 30.30.

It is welded at F. Therefore, the plate material 27 is not welded to the structural member in advance, but is inserted after the box structure is completed. In this invention as well, the same effects as those of the above-described invention can be obtained. Furthermore, in the examples shown in FIGS. 6(a) and (b) to FIG. 9(a) and (b), the mounting position of the hook cylinder 18 can also be reversed from that shown in each figure. .

[Brief explanation of the drawing]

1(a) to 1(C) are a front view, a front view, and a plan view of the front arm according to the present invention, FIG. 1(d) is a view taken along line nn in FIG. 1(a), and FIG. 3 is an exploded perspective view of the upper part of the front arm, and FIG. 4 is an explanatory diagram of the operation when the posture holding member is released to dump the container. Fig. 5 is a sectional view of an example in which the front and back of the constituent members are reversed, Fig. 6 (a), (b)
) is a sectional view of an example in which a reinforcing member is welded in advance to a U-shaped component, FIGS. 7(a) and (b) are sectional views of an example in which two flat plate components are used, Figure 8(a), (
b) is a sectional view of an example in which two U-shaped structural members are used, FIGS. 9(a) and 9(b) are examples of a sectional structure in a different invention, and FIG. An explanatory diagram of the configuration of the cargo handling device and loading and unloading work in the cargo handling vehicle,
FIG. 11(a) is an explanatory diagram when a load is applied to the fixed hook via the posture holding member, and FIG. 11(b) is an explanatory diagram when the load is applied to the swinging hook via the posture holding member. It is. 1-Container, 5-Lift arm, 6-Car body, 7-・
Lift cylinder, 9--Front arm, 11--
Posture holding member, 15--recess, 16-fixing hook, 1
7.-Swinging hook, 18-hook cylinder, 23°25
・-Component member, 27・-Reinforcement member (plate material), 28° 30
...Notch. Patent Applicant Kyokuto Kaihatsu Kogyo Co., Ltd. Agent Patent Attorney Yoshimura Tsutomu (and 1 other person) Figure 6 (a) Figure 6 (bl Figure 8 (a) Figure 8 (b) 2] Figure 9M (b) Figure 11 (a) Figure 11 (b) Q

Claims (2)

[Claims] (1) In a cargo handling vehicle, a removable container is supported by a pair of lift arms installed on the left and right sides of the vehicle body, and the lift arm is swung back and forth by the operation of a lift cylinder to load and unload the container. In order to maintain the attitude of the container inside, a front arm that supports an attitude holding member provided at the upper front end of the container is rotatably attached to the vehicle body. A fixed hook into which the member is inserted, and a swinging hook that opens and closes the recess to hold and release the posture holding member, the front arm having a box structure with a rectangular cross section,
A hook cylinder that rotates the swinging hook is attached to one of the structural members forming the box structure, and a reinforcing member is interposed between the structural member and the other structural member facing it. A notch through which the reinforcing member is inserted is formed in one of the constituent members, and one end of the reinforcing member is T-shaped in the constituent member without the notch.
A front arm structure for a cargo handling vehicle, characterized in that the front arm structure is welded in a butt-shaped state, and the other end is welded on the outside of a component inserted through a notch. (2) In a cargo handling vehicle, a removable container is supported by a pair of lift arms installed on the left and right sides of the vehicle body, and the lift arm is swung back and forth by the operation of a lift cylinder to load and unload the container. In order to maintain the attitude of the container inside, a front arm that supports an attitude holding member provided at the upper front end of the container is rotatably attached to the vehicle body. A fixed hook into which the member is inserted, and a swinging hook that opens and closes the recess to hold and release the posture holding member, the front arm having a box structure with a rectangular cross section,
A hook cylinder that rotates the swinging hook is attached to one of the structural members forming the box structure, and a reinforcing member is interposed between the structural member and the other structural member facing it. and a notch through which the reinforcing member is inserted is formed in both of the structural members, and both ends of the reinforcing member are welded to the outside of the structural member inserted through each of the notches. Front arm structure.