JPH0958982A - Swing motion lock device of mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lock swing motion of a swinging body against a car body frame without rattling by furnishing a means to engage a member for locking and an engagement part with each other in an engaged state by a taper. SOLUTION: A wheel crane is provided with a swing motion lock device 20 to lock swing motion of a swinging body including a swing table 3 against a carrier frame 14. This swing motion lock device 20 is furnished with a pair of oscillating arms 21 installed on the swing table 8 free to oscillate, a block 22 for locking provided on an end of the oscillating arm 21, an engagement bracket 24 provided on the carrier frame 14 and an operation wire 29 to operate oscillation of the oscillating arm 21. Consequently, it is possible to acquire locking motion without rattling by pushing out an operation wire 29 by operating an operation lever, oscillating the arm 21 downward and engaging a tapered block 22 with a tapered engagement groove 28 of the engagement bracket 24 at the time of locking swing motion of the swinging body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing lock device for locking swing of a swing structure of a self-propelled crane.

[0002]

2. Description of the Related Art Generally, in a self-propelled crane, a revolving structure having a cockpit, a boom and the like is mounted on a carrier, which is a traveling vehicle, so as to be freely rotatable. Such a revolving structure is driven by a hydraulically operated revolving motor.However, it is very dangerous that the revolving structure swings when the self-propelled crane travels, and the boom swings to the left and right. As a result, not only the vehicle body vibrates, but also the boom may come into contact with obstacles on the left and right while traveling. Therefore, of course, during traveling, the directional control valve that controls the flow of hydraulic pressure to the swing motor is set to neutral, and the drive of the swing structure is hydraulically locked.

However, since the revolving structure is a very heavy one equipped with a boom and a cab, the revolving structure cannot be completely locked only by hydraulically locking, and the backlash of the revolving gear and the like are also caused. Then, the revolving structure vibrates in the revolving direction during traveling. Therefore, the boom swings to the left and right during traveling, which is extremely dangerous, and due to this, the vehicle body vibrates and noise is generated.

For this reason, in a general truck crane, not only is the swing body locked hydraulically, but it is mechanically locked. That is, a boom rest for positioning and fixing the boom is provided on the carrier side (non-revolving side), and the swing of the revolving structure is mechanically locked by preventing the left and right swing of the boom during traveling by this boom rest. There is. As a result, the revolving structure
In addition to the hydraulic lock described above, the mechanical lock by the boom rest prevents vibration (turning) during traveling, and as a result, vibration and noise of the vehicle body are also suppressed.

By the way, the boom rest is not provided on all self-propelled cranes. In particular, the boom rest is generally not provided in a wheel crane having one cab which serves both as a crane cockpit and a traveling cab. This is because a wheel crane having a relatively small total weight, unlike a truck crane or the like, has a relatively short length of a vehicle body frame and cannot secure a space for providing a boom rest. That is,
This is because the wheel crane has a small space for installation on the vehicle body frame instead of a small turn, and even if a boom rest is provided, the swinging body that makes a turning motion interferes with the boom rest. Further, in general, in the case of a wheel crane, the visibility deteriorates when there is a boom rest.

However, if the boom rest is not provided, that is, if the revolving structure is not mechanically locked, the above-mentioned inconvenience occurs. In particular, since the wheel crane travels while being stored with the boom projecting long forward, the boom is apt to sway left and right due to vibration during travel. Therefore, it can be said that the mechanical lock of the revolving structure is an important measure in the wheel crane more than in the truck crane.

Therefore, in a self-propelled crane having no boom rest like a wheel crane, conventionally, as shown in FIG. 7, a swing table 80 of a swing structure is fixed to a vehicle body frame 86 and the swing table 80 is fixed. A swivel lock pin 84 is provided for mechanically locking the swivel.

The swing lock pin 84 can be moved up and down by an operating means 82 composed of an operating wire or the like. When the swing body is locked by the lock pin 84, the lock pin 84 is moved by the operating means 82. It is moved downward and dropped into the pin receiving boss 90 provided on the vehicle body frame 86. Then, in this state, the lock pin 84 is supported at its upper end portion by, for example, the pin support portion 88 provided on the turning table 80,
Further, the lower end is held at the lock position (the position in FIG. 7) fitted in the pin receiving boss 90.

[0009]

By the way, in a self-propelled crane having no boom rest, the lock pin 84 needs to be vertically inserted into and removed from the pin receiving boss 90 as described above. In order to facilitate insertion and removal with respect to the pin receiving boss 90, the pin receiving boss 90 and the supporting portion 88 and the lock pin 84 are fitted with each other with some play.

That is, in a self-propelled crane having no boom rest, the revolving structure is mechanically locked by the lock pin 84, but there is some play in the locked state, and the revolving structure is completely locked. It was difficult. Therefore, the revolving structure vibrates (rotates) during traveling, and it is impossible to completely prevent the left and right swings of the boom and the accompanying swing of the vehicle body. In particular, as shown in FIG. 7, in the structure in which the lock pin 84 is vertically inserted into and removed from the pin receiving boss 90, the lock pin 84 cantilevers with respect to the support portion 88 (fulcrum), and The bending force acts on the lock pin 84 itself due to the vibration in the turning direction. Therefore, due to the synergistic effect of the action of this bending force and the play of the lock pin 84 described above, the vibration of the revolving structure is further amplified.

Further, such vibration of the revolving structure vibrates the jib stored and supported on the side of the boom to generate noise, and also deteriorates the riding comfort. Further, particularly in a large-sized wheel crane, the cab tends to be installed in front of the center of gravity of the vehicle body in order to secure the front field of view, and the vehicle body easily vibrates during traveling. Therefore, in such wheel cranes as well, in which the boom is stored with the boom protruding forward for a long time, it is necessary to completely lock the revolving structure to prevent the vehicle body from shaking.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a swing lock device for a self-propelled crane capable of swing-locking a swing structure with respect to a vehicle body frame without rattling. To provide.

[0013]

In order to solve the above problems, the present invention relates to a swing lock device for locking the swing motion of a swing structure which is swingably mounted on a carrier frame of a self-propelled crane. An arm whose one end is swingably connected to a revolving structure, an operating means for operating the swing of the arm, a locking member fixed to the other end of the arm, and a carrier frame provided with the locking member. It is provided with an engaging portion engageable with a member, and a means for engaging the locking member and the engaging portion in a tapered fitting state.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. FIG. 3 shows a wheel crane 1 as an example of a self-propelled crane having no boom rest. This wheel crane 1
Has a cab 2 that serves both as a crane cockpit and a traveling cab, and a revolving structure 5 including the cab 2 and a boom 3 is rotatably mounted on a carrier 6, which is a traveling vehicle body. . Specifically, the revolving structure 5 has a revolving table 8 that is revolvingly driven by a revolving motor (not shown), and the cab 2 and the boom 3 are installed on the revolving table 8. In this case, the boom 3 is supported by a support frame 10 provided on the revolving table 8 so as to be able to rise and fall. In addition, reference numeral 12 in the drawing denotes a jib that is stored and supported on the side of the boom 3.

Further, the wheel crane 1 includes a revolving structure 5
A swing lock device is provided for swing-locking the carrier with respect to the carrier frame 14. Details of this swing lock device are shown in FIG.

As shown, this swing lock device 20
Is a pair of swing arms 21 and 21 swingably attached to the swivel table 8, a lock block 22 provided at one end of the swing arms 21 and 21, and a lock block provided on the carrier frame 14. An engaging bracket 24 that can be engaged with the block 22 and an operation wire 29 that operates the swing of the arms 21 and 21 are provided.

A predetermined portion of the swing table 8, for example, the swing table 8 on which the front end side of the boom support frame 10 is located.
A pair of support brackets 26, 26 are provided on the lower surface portion of the. A support member (bearing member) 23 is installed between these support brackets 26, 26,
With respect to the support member 23, the pair of arms 21, 21
One end of is attached to be rotatable (swingable). In this case, the support brackets 26, 26 are arranged such that the arms 21, 21 supported thereby extend tangentially to the orbit circle of the turntable 8 as shown in FIG. It is provided in the lower surface portion of the turning table 8 in a predetermined direction so that the extending direction of 21 and the radial line passing through the turning center O of the turning table 8 are substantially at right angles.

A lock block 22 is provided at the other ends of the arms 21 and 21 which are swingably supported by a support member 23. The lock block 22 is provided on the arm 2
It is sandwiched between 1 and 21 and is fixed, for example, in a state where its substantially central portion is supported by the arms 21 and 21.

The lock block 22 is formed as a block having a tapered cross section. That is, the block 22 has the first taper portion 22a on the side surface facing the turning direction a which is the extension side direction of the arm 21, and the first taper portion 22a on the side surface facing the turning direction b which is the opposite direction to the turning direction a. It has two taper portions 22b.

The engaging bracket 24 that engages with the block 22 is provided with a concave engaging groove 28 for receiving the block 22. The engagement groove 28 has a first taper portion 28a that is inclined at substantially the same inclination angle as that of the first taper portion 22a at a portion corresponding to the first taper portion 22a of the block 22. The second taper portion 22b has a second taper portion 28b which is inclined at substantially the same inclination angle as the second taper portion 22b at a portion corresponding to the second taper portion 22b.

In the state where the block 22 and the bracket 24 are engaged with each other, the force for turning the revolving unit 5 in the revolving direction a acts on the arm 21 as a compression force, and the revolving unit 5
The force that tries to turn the arm in the turning direction b acts on the arm 21 as a pulling force. The inclination angle of the first taper portion 22a and the inclination angle of the second taper portion 22b of the block 22 are different from each other so that the tensile force and the compressive force acting on the arm 21 have substantially the same magnitude. In particular,
The inclination direction of the first taper portion 22a is such that the arm 2 in the state where the block 22 and the bracket 24 are completely engaged.
1 is substantially perpendicular to the tilting direction of the carrier frame 1.
It is almost vertical to 4.

The swing of the arm 21 for engaging the block 22 and the bracket 24 causes the connecting member 27 to move to the block 22.
It is operated by the operation wire 29 fixed via the. The operation wire 29 is composed of a guide portion 25 fixed to a predetermined portion of the revolving structure 5 and a guide member connected to the guide portion 25.
As shown in FIG. 4, it is guided to the inside of the cab 2 and is connected to an operation lever 30 provided in the cab 2.

When the revolving structure 5 is revolvingly locked with respect to the carrier frame 14 by using the revolving lock device 20, the operating lever 30 in the cab 2 is first.
(See FIG. 4) to push out the operation wire 29. As a result, the arm 21 swings downward, and the block 22 provided at the end of the arm 21 engages with the engagement groove 28 of the engagement bracket 24 of the carrier frame 14.

In this case, the arm 21 and the support bracket 2
The rocking shaft portion with 6 does not rattle because it has a minimum gap that allows only the rocking of the arm 21, and the engaging portion between the block 22 and the bracket 24 is tapered with respect to each other. Since the parts 22a (22b) and 28a (28b) are fitted and engaged with each other, the block 22 can be easily inserted into the bracket 24, and the block 22 can be inserted like the conventional lock pin shown in FIG. It is not necessary to provide the groove, and it is possible to maintain a tight and tightly fitted state without backlash.

Therefore, the swing lock device 20 of this embodiment has almost no rattling as a whole, and the swing table 8 is firmly fixed to the carrier frame 14 to lock the swing of the swing body 5 almost completely. can do.

As described above, in the swing lock device 20 of this embodiment, the swinging position of the swinging body 5 is mechanically almost completely locked by reducing the rattling position as much as possible. Vibration during running can be reduced as much as possible. Therefore, the ride comfort of the vehicle body is improved, and noise can be reduced.

Further, the swing lock device 20 of the present embodiment.
Since the arm 21 extends tangentially to the circle of the orbit of the revolving table 8, a large bending force does not act on the arm 21 even when the revolving structure 5 tries to revolve.
Therefore, the durability of the arm 21 is improved.

Further, the swing lock device 20 of the present embodiment.
Is driven by the operation wire 29 that is manually pushed and pulled via the operation lever 30, so that the cost can be reduced compared to the case where it is driven by a hydraulic cylinder, a motor, or the like.

The swivel lock device 20 of the present embodiment having the above-described effects is the wheel crane that is stored and travels in a state where the boom is projected so as to be long forward, and particularly the cab is located forward of the center of gravity of the vehicle body. It is useful to apply to a large-sized wheel crane that is installed in a vehicle and the vehicle body easily vibrates during traveling.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the tapered portions 22a (22b), 2
Engagement bracket 2 by fitting between 8a (28b)
The engagement releasing means 32 is provided between the block 22 and the operation wire 29 in the first embodiment so that the strong engagement between the block 4 and the block 22 can be easily released.

That is, the engagement releasing means 32 is rotatably attached to the connecting portion 37 of the block 22 through the fulcrum pin 39 in the vicinity of one end of the rod-like member 35 embedded in the block 22. It consists of a link 36. The rod-shaped member 35 has its head protruding from the upper surface of the block 22 and its lower end in contact with the bottom of the engagement groove 28 of the engagement bracket 24. The operation wire 29 is connected to the other end of the link 36.

With this structure, when the operating wire 29 is pulled by the operating lever 30, the link 36 rotates about the fulcrum pin 39, and one end of the link 36 abuts on the head portion 35a of the rod member 35. The lever bar member 35 is pressed downward, and the fitting state of the tapered portions 22a (22b) and 28a (28b) is easily released by the "lever principle".

FIG. 6 shows a third embodiment of the present invention. In the present embodiment, the pair of swing arms 44,
One end of 44 is attached to the peripheral portion of the turning table 8 (see FIG. 1) via a fulcrum pin 50, and extends substantially in the radial direction of the turning table 8. Further, the block 40 is fixed to the other ends of the swing arms 44, 44 as in the first embodiment. Although not shown, an operation wire 29 (see FIG. 1) for vertically swinging the swing arms 44, 44 is connected to the block 40, and the carrier frame 14 (see FIG. 1) can be engaged with the block 40. An engaging bracket 42 is provided.

The block 40 has a turning direction a and a turning direction b.
The first taper portion 40a is provided on each of the side surfaces facing in both directions.
And a second taper portion 40b. Further, the engagement bracket 42 that engages with the block 40 includes the block 4
A concave engagement groove 43 for receiving 0 is provided.
The engagement groove 43 is formed in the first tapered portion 40 of the block 40.
The portion corresponding to a has a first taper portion 43a that is inclined at substantially the same inclination angle as the first taper portion 40a, and the portion of the block 40 corresponding to the second taper portion 40b has a second taper portion. It has a second tapered portion 42b that is inclined at substantially the same inclination angle as the portion 40b.

As in this embodiment, the swing arms 44, 44
When the rotating table 8 is arranged substantially in the radial direction, the forces acting on the swinging arms 44, 44 are substantially the same regardless of which of the rotating directions a, b the rotating table 8 rotates. The inclination angle of the first tapered portion 40a and the inclination angle of the second tapered portion 40b can be made substantially the same.

The extending direction of the arm is the turning table 8
Since it is substantially at right angles to the turning direction, the block 40 and the engaging bracket 42 are less likely to come off than in the first embodiment.

[0037]

As described above, according to the swing lock device of the present invention, the swing structure can be swing-locked with respect to the vehicle body frame without rattling.

[Brief description of drawings]

FIG. 1A is a configuration diagram of a main part of a swing lock device according to a first embodiment of the present invention, and FIG. 1B is a view in the direction A of FIG.

FIG. 2 is a plan view showing an extension direction of an arm of the swing lock device of FIG.

FIG. 3 is a side view of a wheel crane showing an example of a self-propelled crane provided with a swing lock device of the present invention.

FIG. 4 is a schematic view showing a connected state of an operation wire for swinging an arm of the swing lock device of FIG.

FIG. 5 is a main part configuration diagram of a swing lock device according to a second embodiment of the present invention.

FIG. 6 is a main part configuration diagram of a swing lock device according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a main part of a conventional swing lock device.

[Explanation of symbols]

1 ... Wheel crane (self-propelled crane), 5 ... Revolving structure, 8 ... Revolving table, 14 ... Carrier frame, 21
... rocking arm, 22 ... locking block, 22a, 22
b, 24a, 24b ... Tapered portion, 24 ... Engaging bracket (engaging portion), 29 ... Operation wire.

Claims (3)

[Claims] 1. A swing lock device for locking the swing motion of a swing structure rotatably mounted on a carrier frame of a self-propelled crane, the arm having one end swingably connected to the swing structure, An operating means for operating the swing of the arm; a locking member fixed to the other end of the arm; an engaging portion provided on the carrier frame and engageable with the locking member; and the locking member. A swing lock device for a self-propelled crane, comprising: means for engaging the engagement portion in a fitted state by taper. 2. The swing lock device according to claim 1, wherein the arm extends in a tangential direction with respect to a swing orbit circle of the swing structure. 3. The swing lock device according to claim 1, wherein the arm extends substantially perpendicular to a swing direction of the swing structure.