JP2002120778A - Crawler traveling body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crawler traveling body capable of surely varying a lateral width to a lateral width enlarged position and stably maintaining the condition in the lateral width enlarged position. SOLUTION: Hydraulic cylinders 13 to 16 are disposed in a connection part 1a of a truck frame 1, and a limit switch 21 for detecting the lateral width enlarged position of a side frame 2 is provided. When an extensible and shrinkable cylinder 3 of the side frame 2 is operated and the lateral width enlarged position of the side frame 2 is detected by the limit switch 21, the condition is notified by a lamp 43 and the hydraulic cylinders 13 to 16 are extended to close a space between the truck frame 1 and the side frame 2. Thus, the stability of the vehicle body is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler-type traveling body of construction equipment typified by a crane, a hydraulic shovel, and the like, and more particularly, to a truck frame having side frames movably provided on both sides in a width direction. The present invention relates to a crawler type traveling body.

[0002]

2. Description of the Related Art A construction machine such as a crawler crane is provided with a track frame as a main frame on a traveling body, and side frames on both sides of the track frame, around which idle tracks and drive wheels are hung by crawler tracks. The side frame is provided so as to be movable with respect to the track frame due to the stability of the vehicle body during crane work and the dimensional restrictions during transportation. The vehicle width can be changed to a vehicle width expanding position in a state where stability is the highest (a state with the highest stability) and a vehicle width reducing position in a retracted state (a state where the distance between the side frames is minimum and the traveling body width dimension is small).

[0003] Since the side frame is movable with respect to the track frame, a sliding gap is provided between the side frame and the track frame for smooth movement. In order to eliminate the unstable situation due to the side frame being inclined with respect to the track frame in the gap, it is necessary to remove the gap at the enlarged and reduced positions of the side frame and to stably fix both sides. Will be As a traveling body provided with such a mechanism, one described in Japanese Patent Application Laid-Open No. H10-258782 is known. In this publication, a side frame movably attached to a track frame is driven by an expansion / contraction cylinder to an enlarged position where the distance between the side frames is the maximum and a minimum reduced position. In order to eliminate a sliding gap formed between the track frame and the side frame at the reduced position, a hydraulic cylinder for pressing a cylinder rod toward the side frame is provided at each end of the connecting portion of the track frame. Then, when moving the side frame, the hydraulic cylinder is contracted, a gap is provided between the side frame and the track frame to expand and contract the expanding / contracting cylinder, and when the side frame reaches the enlarged position, the hydraulic cylinder is extended and the cylinder rod is extended. Is pressed against the side frame to eliminate the gap with the track frame and fix them together.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No.
No. 2,587,782 discloses that the cylinder rod of the hydraulic cylinder contracts in conjunction with the expansion / contraction operation of the expansion / contraction cylinder, and the hydraulic cylinder expands due to the spring force built into the hydraulic cylinder along with the stop of the expansion / contraction operation of the expansion / contraction cylinder. It fixes the frame.

Therefore, when a load is applied to the hydraulic cylinder by the crane operation, the spring contracts, the side frame is inclined with respect to the track frame, and the stability of the crane may be reduced. Also, if the side frame stops at a position other than the predetermined vehicle width expanding position for some reason during the side frame expanding operation, the worker assumes that it is the vehicle width expanding position and stops the operation of the expansion cylinder. Therefore, there is a possibility that the crane operation may be performed in a state of insufficient stability that is not at the predetermined vehicle width expanding position.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. Even if a load is applied to a hydraulic cylinder for preventing relative inclination between a track frame and a side frame, the hydraulic cylinder does not contract and the crane does not contract. Crawler that can safely and easily perform the side frame expansion and contraction operation by ensuring the stability of the side frame and automatically completing the expansion and contraction operation when the side frame reaches a predetermined vehicle width expansion position. It is intended to provide a traveling vehicle.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a track frame having connecting portions protruding at both side ends, a driving wheel and an idle wheel, which are rotatably supported, and wherein the connecting portion is provided. A pair of left and right side frames respectively slidably disposed laterally with respect to the track frame through the fitting holes, and A driving means for driving between the vehicle width expanding position and the vehicle width reducing position, and extending to the connecting portion at the vehicle width expanding position and abutting against the side frame, thereby connecting the fitting hole to the connection hole. The present invention is applied to a crawler-type traveling body including a hydraulic cylinder that prevents relative tilting between the track frame and the side frame due to a gap between the track frame and the side frame.
Position detecting means for detecting the vehicle width expanding position and outputting a signal; notifying means for notifying the vehicle width expanding position based on the signal; and a relative position between the track frame and the side frame based on the signal. Hydraulic cylinder operating means for operating the hydraulic cylinder so as to prevent tilting.

Further, the invention of claim 2 is characterized in that the hydraulic cylinder operating means includes a holding means for holding the state when the operation of the hydraulic cylinder is stopped.

Further, the invention according to claim 3 is a state detecting means for detecting a change in the state of the hydraulic cylinder held by the holding means, and an alarm based on the change in the state detected by the state detecting means. It is provided with alarm means for issuing.

Further, in the invention according to a fourth aspect, the position detecting means is a switch for detecting the vehicle width expanding position and controlling the hydraulic cylinder operating means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view showing a configuration of a crane to which a crawler-type traveling body according to an embodiment of the present invention is applied, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a sectional view taken along line II of FIG. is there. FIG.
As shown in FIG. 3, the crawler crane has an upper revolving unit 53 attached to a lower traveling unit 51 via a revolving device 52, and a boom 54 attached to the upper revolving unit 53 so as to be able to move up and down. The lower traveling body 51 is the track frame 1
And the side frame 2. Track frame 1
A pair of connecting portions 1a is formed so as to project outward, and a pair of left and right side frames 2 are connected to the connecting portions 1a. Drive wheels 7 driven to rotate by a hydraulic drive device 7 are provided at the front and rear portions of each side frame 2.
a and idler wheels 8 are provided respectively, and a plurality of lower rollers 9L having an inner flange and an outer flange are provided on the lower surface side of the side frame 2 by driving wheels 7a and idler wheels 8.
And is rotatably supported between them. A crawler belt 6 is wrapped around the drive wheel 7 and the idler wheel 8, and the crawler belt 6 is rotated by a sprocket 7 a of the drive wheel 7 and the lower roller 9 L and the upper roller 9 provided on the upper surface side of the side frame 2.
It is driven while being guided by U.

The side frame 2 is also formed with a pair of front and rear fitting holes 2a that open in the width direction, and the respective connecting portions 1a of the track frame 1 are slidably inserted into the respective fitting holes 2a. . Here, the connecting portion 1 of the track frame 1
The height of “a” and the height of the fitting hole 2a of the side frame 2 are set such that a gap S (see FIG. 1) is formed between the connecting portion 1a and the fitting hole 2a.

As shown in FIG. 3, the left and right side frames 2
Between them, an expansion / contraction cylinder 3 for expanding / contracting the side frame 2 is provided. The rod side of the expansion / contraction cylinder 3 is connected to the left side frame 2 and the bottom side is connected to the right side frame 2 respectively. . Accordingly, the expansion and contraction of the expansion / contraction cylinder 3 causes each side frame 2 to
As shown by a, the truck frame 1 can be moved between the working position (vehicle width expanding position) and the transport position (vehicle width reducing position). Links 17-2
0 has one end connected to each side frame 2,
As shown in FIGS. 3 and 4, the vehicle width of the side frame 2 is increased by connecting the other end to a bracket 1 d projecting from the track frame 1 with a pin or the like at the vehicle width expanding position or the vehicle width reducing position. Alternatively, it can be fixed at the reduced position.

As shown in FIG. 2 and FIG. 3, hydraulic cylinders 13 to 16 are provided at the connecting portion 1a of the track frame 1. Rod 13A of hydraulic cylinders 13-16
16A penetrate the upper surface member 1c of the track frame 1 and protrude from the upper surface of the connecting portion 1a. FIG. 2 shows a state in which the rods 13A to 16A extend and press the side frame 2, and as a result, the hydraulic cylinders 13 to 16 stretch between the track frame 1 and the side frame 2.

FIG. 5 is an enlarged view of a main part a in FIG. FIG. 4A shows a state where the side frame 2 is in the vehicle width expanding position, and FIG. 4B shows a state where the side frame 2 is in the vehicle width reducing position. Link 17 has striker 17
The limit switch 21 is attached to the bracket 1d of the track frame 1. As shown in FIG. 4A, when the side frame 2 is moved to the vehicle width enlarged position, the striker 17a comes into contact with the limit switch 21, and the electric circuit of the limit switch 21 is switched.

FIG. 6 is a sectional view taken along the line II-II of FIG.
6A shows a state in which the hydraulic cylinders 13 to 16 are extended (only the hydraulic cylinder 14 is shown in the figure) and the side frame 2 is pressed, and FIG.
16 shows a state in which 16 is contracted. Hydraulic cylinder 14
Is mounted with a striker 14d, and a limit switch 22 is mounted inside the track frame 1. As shown in FIG. 6B, the hydraulic cylinder 1
When 4 is contracted, the striker 14d contacts the limit switch 22, and the electric circuit of the limit switch 22 is switched. FIG. 7 is a circuit diagram for driving the expansion / contraction cylinder 3 and the hydraulic cylinders 13 to 16 in the present embodiment. In the figure, 40 and 41 are power supplies, 42 is a switch for operating the expansion / contraction operation of the side frame 2 by switching the expansion / contraction operation of the expansion / contraction cylinder 3 and the hydraulic cylinders 13 to 16, and 21 and 22 are the limit switches described above. When the switch 42 is operated to the contact "a" side, the expansion / contraction cylinder 3 is operated in the vehicle width expansion direction of the side frame 2 to reach the expansion position, and then the hydraulic cylinders 13 to 16 are extended and operated to the contact "b" side. Then, after the hydraulic cylinders 13 to 16 are reduced, the expansion / contraction cylinder 3 is operated with the side frame 2 directed to the reduced position.

The limit switch 21 is switched to the contact point d to detect the enlarged position of the side frame 2,
The non-enlarged position is detected at the contact point c. Limit switch 2
2 detects the contracted position of the hydraulic cylinders 13 to 16 on the contact 1 side, and detects the non-reduced position on the contact m side.

Reference numeral 30 denotes a hydraulic pressure source for driving the expansion / contraction cylinder 3 and hydraulic cylinders 13 to 16. Reference numeral 31 has switching positions g, e, and f. The operation of the expansion / contraction cylinder 3 and the hydraulic cylinders 13 to 16 is stopped at the switching position f at the switching position f, and the solenoid valves are extended at the switching position e and reduced at the switching position f. 3
Reference numerals 2 and 33 denote solenoid valves for switching whether or not to supply the pressure oil guided by the solenoid valve 31 to the expansion / contraction cylinder 3 and the hydraulic cylinders 13 to 16 based on the detection signals of the limit switches 21 and 22, respectively. , K, the supply of pressure oil is blocked, and the pressure oil is supplied at the switching positions h, j. The solenoid valve 33 is connected to the hydraulic cylinder 1
In the state where 3 to 16 are not operated, the hydraulic cylinders 13 to
It has a configuration to block outflow of pressurized oil from 16.

Reference numeral 43 denotes a lamp for notifying that the side frame 2 is at the vehicle width expanding position (working position) by the limit switches 21 and 22. Next, the operation of the crawler type traveling body configured as described above in the side frame enlarging / reducing operation will be described.

First, the operation for moving the side frame 2 from the transport position to the working position will be described. First, the connection between the track frame 1 and the links 17 to 20 is released, and the expansion of the side frame 2 by the expansion / contraction cylinder 3 is enabled.
Next, the switch 42 is switched to the a side in FIG. Then, the solenoid valve 31 is switched from the switching position f to the switching position e.
Switch to Further, since the limit switch 21 is switched to the side c since the side frame 2 is at the transport position (vehicle width reduction position), the solenoid valve 32 is energized and switches from the switching position i to h. As a result, oil is supplied from the hydraulic pump 30 to the bottom chamber 3a of the expansion / contraction cylinder 3, the oil in the rod chamber 3b returns to the tank 34, the expansion / contraction cylinder 3 expands, and the side frame 2 starts expanding accordingly.

When the side frame 2 reaches the working position (vehicle width enlarged position), the striker 17a comes into contact with the limit switch 21 as shown in FIG. 5 (a), and the limit switch 21 moves from the contact c side to the d side. Switch. As a result, the lamp 43 is turned on, the solenoid valve 32 is turned off, the switching position is switched from the switching position h to the switching position i, and the supply of oil to the expansion / contraction cylinder 3 is cut off. Thus, the extension of the expansion / contraction cylinder 3 stops, and the extension of the side frame 2 stops. When the limit switch 21 is switched from the contact c side to the d side, the solenoid valve 33 is energized,
The switching position is switched from the switching position k to j, and the pressure oil from the hydraulic pump 30 is supplied to the bottom chambers 13 a to 1 of the hydraulic cylinders 13 to 16.
6a, the oil in the rod chambers 13b-16b returns to the tank 34, and the hydraulic cylinders 13-16 extend. As a result, as shown in FIG. 6A, the hydraulic cylinders 13 to 16 can press the side frames 2 to eliminate the gap between the track frame 1 and the side frames 2, and When the pressing force of the hydraulic cylinder 3 reaches a certain level or more, the relief valve 35 opens the circuit and returns the oil from the hydraulic pump 30 directly to the tank 34. By returning the switch 42 to the neutral position, the solenoid valves 31 and 33 are set to the f position,
Switches to the k position. Thereby, the hydraulic cylinders 13-1
6 is cut off and the hydraulic cylinders 13-16
Maintains that state. Finally, by connecting the track frame 1 and the links 17 to 20, the vehicle width of the side frame 2 can be fixed at the working position (vehicle width enlarged position).

Next, the operation for moving the side frame 2 from the working position (vehicle width expanding position) to the transport position (vehicle width reducing position) will be described. As described above, first, the connection between the track frame 1 and the links 17 to 20 is released, and the side frame 2 can be reduced by the expansion / contraction cylinder 3. Subsequently, the switch 42 is switched to the contact b side. Then, the solenoid valve 31 is energized, and the solenoid valve 31 switches from the switching position f to g. Since the limit switch 22 is switched to the contact m side because the hydraulic cylinders 13 to 16 are pressing the side frame 3, the solenoid valve 33 is energized and the switch position k to j is switched.
Switch to Accordingly, oil is supplied from the hydraulic pump 30 to the rod chambers 13b to 16b of the hydraulic cylinders 13 to 16, and the oil in the bottom chambers 13a to 16a returns to the tank 34, so that the hydraulic cylinders 13 to 16 contract. As shown in FIG. 6B, when the hydraulic cylinders 13 to 16 are reduced to the state shown in the figure, the striker 14d comes into contact with the limit switch 22, and the contact of the limit switch 22 switches from the m side to the l side. As a result, the solenoid valve 33 is de-energized and switched from the switching position j to k, and the hydraulic cylinder 1
The cutoff of the hydraulic cylinders 13 to 16 stops when the supply of oil to 3 to 16 is cut off. Also, by switching the limit switch 22 from the contact m side to the l side,
The solenoid valve 32 is energized and the solenoid valve 32
Switches from the switching position i to h. As a result, oil is supplied from the hydraulic pump 30 to the rod chamber 3b of the expansion / contraction cylinder 3, and the oil in the bottom chamber 3a returns to the tank 34, so that the expansion / contraction cylinder 3 contracts and the side frame 2 starts to contract accordingly. When the side frame 2 reaches the transport position (vehicle width reduction position), the switch 42 is returned to the neutral position, and the contraction of the side frame 3 is stopped. Finally, by connecting the truck frame 1 and the links 17 to 20, the vehicle width of the side frame 2 can be fixed at the transportation position.

As described above, in the present embodiment, the limit switch 21 detects the vehicle width expanding position of the side frame 2, and the lamp 43 confirms that the worker is at the vehicle width expanding position. can do. Also, after the expansion and fixing work of the side frame 2 is completed by the solenoid valve 33, the pipeline connected to the hydraulic cylinders 13 to 16 is shut off, so that the hydraulic cylinders 13 to 16 contract even when a load is applied thereto by crane work or the like. Since the truck frame 1 does not tilt, the stability of the crane can be ensured without inclination.

-Second Embodiment- Next, a second embodiment of the present invention will be described. FIG. 8 is a circuit diagram for driving the expansion / contraction cylinder 3 and the hydraulic cylinders 13 to 16 according to the second embodiment of the present invention.
In the drawings, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted. In the second embodiment, in addition to the configuration of the first embodiment, a pressure switch 36 for detecting the bottom pressure of the hydraulic cylinders 13 to 16 and a pressure switch 3 are provided.
A lamp 45 for notifying the detection state of No. 6 is provided.

Next, the operation of the second embodiment will be described. In the work of enlarging and fixing the side frame 2, since the operator cannot determine whether or not the hydraulic cylinders 13 to 16 are pressing the side frame 2, the operator continues to operate the switch 42 for a while.
Therefore, the operation of the switch 42 causes the hydraulic cylinders 13 to
When the pressure on the bottom side of No. 16 exceeds a certain value, the contact n
A pressure switch 36 for switching from the side to the contact o side is provided. Then, the lamp 45 is turned on in conjunction with the switching of the contact point of the pressure switch 36 to the o side, so that the operator can confirm that the work is completed. After the work is completed, the hydraulic cylinders 13 to
Even if the pressure oil 16 leaks and the hydraulic cylinders 13 to 16 contract, the pressure switch 36 switches from the contact o side to the contact n side as the pressure on the bottom side decreases, and the hydraulic cylinders 13 to 16 contract. Since the operator can confirm that the side frame 2 and the track frame 1 are operated again, the relative inclination of the side frame 2 and the track frame 1 can be prevented, and the stability of the crane can be maintained.

[0026]

As described above in detail, according to the first aspect of the present invention, the vehicle width expanding position of the side frame is detected, and the lamp is turned on so that the worker can move the side frame to the vehicle width expanding position. Can be confirmed. According to the second aspect of the present invention, since the hydraulic cylinder does not contract when the load is applied to the hydraulic cylinder at the end of the expansion and fixing work of the side frame, the stability of the crane can be secured without the track frame being inclined. According to the third aspect of the present invention, the state of the hydraulic cylinder for eliminating the gap between the track frame and the side frame is detected, and the lamp is turned on or off, thereby completing the operation of expanding and fixing the side frame, or reducing the pressure oil. The operator can confirm the contraction of the hydraulic cylinder due to the leak. According to the fourth aspect of the invention, the detection of the vehicle width enlargement position and the operation of the hydraulic cylinder can be controlled by one switch, so that a simple and inexpensive configuration can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a crane in a crawler type traveling body of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view taken along line II of FIG. 1;

4A is a diagram illustrating a vehicle width expanding position of the traveling body, and FIG. 4B is a diagram illustrating a vehicle width reducing position.

FIG. 5 is an enlarged view of a main part a in FIG.

FIG. 6 is a sectional view taken along line II-II in FIG.

FIG. 7 is a circuit diagram according to the first embodiment of the present invention.

FIG. 8 is a circuit diagram according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Track frame, 1a; Connection part, 2; Side frame, 2a; Fitting hole, 3;
Clearance adjusting hydraulic cylinders, 21, 22; limit switches, 31, 32, 33; solenoid valves, 36; pressure switches, 43, 45;

Claims (4)

[Claims] 1. A track frame having connecting portions projecting from both side ends, a driving wheel and an idle wheel rotatably supported, and a fitting hole into which the connecting portion is loosely fitted. A pair of left and right side frames respectively slidably disposed laterally with respect to the track frame via holes, and driving these side frames between a predetermined vehicle width expanding position and a vehicle width reducing position. A drive unit, which extends from the connecting portion to the side frame by extending at the vehicle width enlarged position and abutting against the side frame, whereby a gap between the fitting hole and the connecting portion allows the track frame and the side frame to be connected to each other. In a crawler-type traveling body including a hydraulic cylinder that prevents relative tilting, a position detection unit that detects the vehicle width expansion position and outputs a signal, and notifies the vehicle width expansion position based on the signal. Crawler-type traveling, comprising: a hydraulic cylinder operating means for operating the hydraulic cylinder so as to prevent relative tilting of the track frame and the side frame based on the signal. body. 2. The crawler-type traveling body according to claim 1, wherein said hydraulic cylinder operating means includes a holding means for holding said state when said hydraulic cylinder stops operating. 3. The apparatus according to claim 1, further comprising: state detecting means for detecting a change in the state of the hydraulic cylinder held by the holding means; and alarm means for issuing an alarm based on the change in the state detected by the state detecting means. The crawler type traveling body according to claim 2, characterized in that: 4. The crawler according to claim 1, wherein said position detecting means is a switch for detecting said vehicle width expanding position and controlling said hydraulic cylinder operating means. Type traveling body.