JPS5914525Y2 - Control device for towed work equipment/tools - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control device for a towed type work machine/tool such as a trench excavator that is towed by a tractor or the like. The purpose is to ensure sufficient ground clearance for the sections.

For example, in a conveyor-type trench excavator mounted on a tractor, the entire conveyor-type trench excavator can be raised and lowered by a cylinder around the shaft of a sprocket at the upper end of the conveyor-type trench excavator, and when the trench excavator is lifted, This is to ensure sufficient ground clearance for the trench section.

However, other types of trench excavators, such as screw auger type trench excavators, are not equipped with the above-mentioned mechanism, and therefore have the problem of not being able to secure a sufficient ground clearance for the trench excavation section.

The present invention has solved the above problem, and its characteristics are that in a vehicle that is equipped with a working machine/tool equipped with a ground-based working part that can be raised and lowered freely, the working part is placed on the side of the machine frame in a working position. and a forward-leaning position, the telescopic body has a telescopic nested structure consisting of a cylinder and a shaft between the machine frame and the working part, and expands and contracts when the working part changes its position. A lock pin that fixes the working part in each posture by releasably fixing the telescoping body to a predetermined length by interposing the telescoping body, the cylinder body, and the shaft body in a removable manner; The lock pin includes a spring that biases the lock pin in the engaging direction, and a rotatable operating lever that operates the lock pin.

Hereinafter, one embodiment of the present invention will be explained based on the drawings.
The vehicle shown in FIG. 1 is a tractor, and has a transmission case 2 as a main component of a vehicle body 3, and a hydraulic device 5 for lifting and lowering a working machine having a pair of left and right lift arms 4 is mounted on the rear upper surface of the vehicle body 3.

Reference numeral 6 denotes a tow-type working machine, exemplified by a screw auger trench excavator, which is attached to the vehicle 1 so as to be movable up and down via a three-point link 9 connected to a top link 7 and a pair of left and right lower links 8.

The working machine 6 has a gear case 10 at the center in the width direction, and from the case 10, a pair of left and right support arms 11 are protruded from both sides, and the outer end of each arm 11 is formed into a left and right L shape. The plate 12 is inserted and supported so as to be relatively rotatable, each lower link 8 is pivotally supported by a lower link mounting pin 13 at the front end of each template plate 12, and a connecting cylinder 1 is connected between the upper ends of both template plates 12.
Connected by 4.

Further, from the gear case 10, a screw auger 15 and a semi-cylindrical auger case 16 with a front opening surrounding the auger 15 are arranged in a lower stage to form a ground working section 17. However, by transmitting power to the input shaft of the gear case 10 via a telescoping transmission shaft 18 equipped with a universal joint at both ends, the auger 15 is configured to be rotatably driven around the vertical axis, and the auger 15 and the auger case are The groove 19 can be excavated by cooperation with the groove 16.

Reference numeral 20 denotes a pair of left and right side plates for shaping the side walls of the groove 19, which protrude rearward from both sides of the auger case 16, and connect upper, middle, and lower connecting plates 21° between the upper end, midway portion in the height direction, and lower end of these both side plates 20. They are connected at 22.23.

Reference numeral 24 denotes a soil removal plate, which is fixed to the side plate 20.

25 is a top mast with a safety mechanism 26 in a forward leaning position,
The top mast 25 has a telescopic structure in which a round bar 27 on the front side and a cylindrical body 28 on the rear side are nested so that they can slide relative to each other. Front lid part 2
A pair of front and rear ring-shaped stoppers 30 and 31 abutting on the top mast 25 are fitted so that the top mast 25 can expand and contract within a predetermined range.

The top link 7 is attached to the horizontal shaft 32 at the front end of the round bar 27.
At the same time, each side of the round bar 27 and each mold plate 12 are connected by a pair of left and right support links 33.
Each support link 33 is pivotally connected to the template 12 so as to be relatively rotatable about the axis of the lower link attachment pin 13.

Further, the rear end of the cylinder 28 is pivotally supported on the widthwise center side of the connecting cylinder 14 by a horizontal shaft 34.
On the 9- side, an equipment cylinder 35 that communicates with the cylinder body 28 is fixed in a perpendicular manner, and an engaging body 36, exemplified by a steel ball, is attached to the equipment cylinder 35 and the front lid part 29 in the axial direction of the equipment cylinder 35. This engaging body 36 is movably installed inside the round bar 27 and has a circumferential groove 3 formed in the round bar 27.
7 in a detachable manner.

38 is a compression coil spring that urges the engaging body 36 toward the round bar 27 side, and a spring receiving piece 39 that comes into contact with the engaging body 36 and the equipment tube 3
5. The adjustment lid 40 is elastically interposed between the adjustment lids 40 which are screwed together on the upper end side so that they can move forward and backward.

41 is a working part 1 interposed between the connecting cylinder 14 and the upper connecting plate 21
7, a posture changing mechanism 42 is an extensible body in a forward tilted position, and this extensible body 42 has a nesting structure in which a cylinder 43 on the front side and a square bar 45 with a sliding body 44 on the rear side can be slid relative to each other. However, the expansion and contraction of the extensible body 42 is regulated within a predetermined range by the contact between the sliding body 44 and the front and rear lid parts 46 and 47 of the cylindrical body 43. 45 is inserted into a square hole 48 of a rear lid part 47 made of a square pipe or the like, thereby preventing relative rotation between the cylinder body 43 and the square rod 45.

The rear end of the square bar 45 is pivotally supported on the widthwise center side of the rear end of the upper connecting plate 21 by a horizontal shaft 49, while the front end of the cylinder 43 is laterally supported on the widthwise center side of the connecting tube 14. A support member 5 is pivotally supported by a shaft 50 and is fixed to one side of the rear end of the cylinder body 43.
1 includes a vertical support shaft 53 with the front end of the bifurcated piece 52 tilted backwards.
It is supported by

A lock pin 54 is attached to a support shaft 55 at the rear end of this bifurcated piece 52.
The lock pin 54 is inserted into the cylinder body 43 through a guide hole 57 of a guide piece 56 fixed to the cylinder body 43, and the lock pin 54 is inserted into the front and rear ends of the square bar 45 in the form of a blind hole. The extensible body 42 can be removably held in a pair of front and rear holding parts 58 and 59 formed in the front and rear holding parts 58 and 59, so that the telescopic body 42 can be placed in a maximum extension position with the working part 17 in a vertical working position and in a forward tilted position. It can be locked to the minimum reduced posture.

Note that the guide piece 56 of the lock pin 54 and the lock pin 54
A compression coil spring 61 is elastically wound between the pins 60 inserted through the lock pin 54 to bias the lock pin 54 toward the square bar 45.

Further, an operating lever 62 for operating the lock pin 54 is fixed to the bifurcated piece 52, and the front end of the lever 62 is extended to near the rear of the seat 63 on the hydraulic device 55.
The operator above can operate the lever 62.

According to the embodiment configured as described above, when digging a trench, the posture changing mechanism 41 engages the lock pin 54 with the front retaining portion 58 as shown in FIG. Then, with the extensible body 42 locked in the maximum extension position and the working part 17 fixed in the vertical working position shown in FIG. 1, the working machine 16 is towed by the vehicle 1 while rotating the auger 15. For example, the groove 19 can be excavated by the working part 17 as before.

During this work, large excavation resistance may act backwards on the working part 17, such as when a stone or the like on the front side comes into contact with the working part 17.

In this case, this digging resistance is the gear case 10, support arm 11. It also acts on the top mast 25 via the L-shaped plate 12, the connecting cylinder 14, etc., and attempts to shorten the top mast 25. If the elastic force of the spring 38 is set appropriately, the engaging body 36 will retreat against the elastic force of the spring 38 due to the compressive force acting on the top mast 25, and the circumferential groove 37
As a result, the top mast 25 contracts until the front stopper 30 and the front lid part 29 come into contact as shown in FIG. The plate 12 rotates back around the axis of the lower link mounting pin 13, thereby relaxing and absorbing the excavation resistance.If the vehicle 1 is stopped at this time, the excavation resistance will cause the work machine to Therefore, the working part 17 of 6 and the members on the vehicle 1 side will not be damaged or damaged.

When returning the working part 17 to the working position, if the vehicle 1 is moved backward, the working part 17, which is in the position shown in FIG. It is possible to rotate and return to the working position shown in the figure.
At the same time, the top mast 25 also extends, the engaging body 36 engages with the circumferential groove 37 of the round bar 27 by the elastic force of the spring 38, and the working part 17 is fixed in the working position.

Next, when driving the vehicle 1 with the work implement 6 lifted, the operating lever 62 of the posture change mechanism 41 is rotated toward the extendable body 42 against the spring 61 to move the lock pin 5.
4 from the front engaging part 58, and with the auger 15 of the working part 17 in contact with the front wall of the groove 19, move the vehicle 1 forward,
The telescopic body 42 is retracted until the sliding body 44 comes into contact with the front lid part 46 of the cylinder body 43, and the working part 17 is rotated backward around the axis of the support arm 11 together with the gear case 10, both support arms 11, etc. Then, as shown in FIG. 4, the working part 17 is placed in a forward-leaning position with its lower part raised.

Then, when the telescopic body 42 starts to contract, the operating lever 6
If the operating force 2 is released, the lock pin 54 engages with the rear retaining portion 59 due to the elastic force of the spring 61, as shown in FIG. 9, and locks the telescopic body 42 in the minimum contracted position. .

Next, as shown in FIG. 5, the working machine 6 is lifted, and since the working part 17 is first lifted in a forward tilted position with its lower part lifted, sufficient ground clearance for the working part 17 can be ensured.

Incidentally, the work of changing the working position of the working part 17 can be performed by the above-mentioned reverse procedure.

As described above, in this embodiment, a hydraulic cylinder is not used for the attitude changing mechanism of the working part, and the mechanism is configured to have a simple structure, so that the attitude changing mechanism can be installed at low cost.

In addition, since work equipment usually vibrates strongly in the vertical direction and not so much in the lateral direction, the operating lever, which is long and tends to vibrate, also tends to vibrate greatly in the vertical direction and not so much in the lateral direction. However, since the lock pin is engaged with and disengaged from the retaining portion by moving in the lateral direction, there is no fear that the lock pin will be detached from the retaining portion due to vibration of the operating lever.

In addition, in this embodiment, since the posture change mechanism and the safety mechanism are provided on the work equipment side, the work equipment can be attached to the vehicle using a standard three-point link, making the above-mentioned installation work easier. I can do it.

Note that the position change mechanism and the safety mechanism may be installed anywhere between the vehicle and the working section, and the installation positions are not limited to the embodiments.

Further, in the embodiment, the present invention is applied to a vehicle equipped with a working machine such as a trench excavator, but the present invention is applied to a vehicle equipped with various working machines and implements such as a subsoiler. It is also applicable to

As described in detail above, the present invention is equipped with a ground-based working part of a work machine/tool that can be freely changed and fixed between a working position and a forward-leaning position. In addition, by tilting the working part forward, sufficient ground clearance can be ensured for the working part when lifting the working machine/tools, and there is no problem with driving on the road.

In addition, it is easy to perform posture change work, and the mechanism consisting of telescoping bodies that fix the working part in each posture has a simple structure without using hydraulic cylinders, so it can be carried out at low cost. Moreover, since the above-mentioned mechanism is included in the working machine/equipment, the working machine/equipment can be attached to the vehicle side using a standard three-point link or the like in the same manner as before.

[Brief explanation of drawings]

The drawings illustrate one embodiment of the present invention, in which Fig. 1 is a side view of a tractor equipped with a trench excavator, Fig. 2 is a plan view of the main part of Fig. 1, and Figs. Fig. 6 is a sectional view showing the safety mechanism, Fig. 7 is an operating state diagram of Fig. 6, Fig. 8 is a sectional view showing the posture change mechanism of the working part, and Fig. 9 is a sectional view showing the safety mechanism. FIG. 1...Vehicle, 5...Hydraulic device for lifting and lowering the work machine, 6...Traction type work machine, 9...3
Point link, 17...Ground work department, 26...
...Safety mechanism, 41...Position change mechanism.

Claims (1)

[Scope of utility model registration request] In a work machine/tool equipped with a ground-based working part that is mounted on a vehicle so that it can be raised and lowered, the working part is pivoted to the machine frame side so that the position can be freely changed between the working position and the forward-leaning position, and the machine frame and the working part are connected to each other. Between,
It has a telescopic nesting structure consisting of a cylindrical body and a shaft body, and an extensible body that expands and contracts when the posture of the working part is changed, and the telescopic body is removably engaged with the cylindrical body and the shaft body. A lock pin that fixes the working part in each position by releasably fixing the extendable body to a predetermined length, a spring that biases the lock pin in the engagement direction, and a rotatable operating lever that operates the lock pin. A control device for a towed work machine/tool, characterized by comprising: