JPS6360197B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pole-erecting vehicle equipped with a drilling device, and more specifically, the drilling device can be released from its retracted state only when the telescopic boom is fully retracted to ensure work safety. This relates to safety devices to improve safety.

In this type of pole-erecting vehicle, a support frame connected with a drilling device is selectively latched to a base boom and a telescoping boom telescopically inserted into the base boom via a latching mechanism. However, if the drilling rig is lowered before the telescopic boom has not completely retracted into the base boom, the support frame cannot be reliably latched onto the telescopic boom, which may cause the drilling rig to extend or retract during operation. There was a risk of it sliding down the boom, which was extremely dangerous.

The present invention has been made in view of the above points, and includes a device for lashing the support piece that holds the drilling equipment in the retracted state, and this lashing device locks the support piece only when the telescopic boom is fully retracted. It is an object of the present invention to provide a safety device which is configured to release the binding state and can securely lock the support frame of a drilling device to a telescopic boom by a locking mechanism, thereby improving work safety.

Embodiments of the present invention will be described below based on the drawings. 1 is a support member 2 installed upright on the chassis of a pole-erected vehicle
This is a multistage boom that is pivotally supported via a hydraulic cylinder 3 to be able to rise and fall freely, and includes a base boom 1a, an intermediate boom 1b as a telescopic boom that is sequentially inserted into the base boom 1a in a telescopic manner, and a first boom 1c. Become.

4 is an auger shaft 4a, a motor 4b for rotationally driving this shaft 4a, and a winding drum 4c for the cable 7.
The base end of this device 4 is connected via a universal joint 6 to a support frame 5 fitted so as to be movable in the axial direction of the telescopic booms 1b and 1c, so that it can be suspended from the base boom 1a. By winding the other end of the cable 7 with one end fixed onto the winding drum 4c by the motor 4b, the drilling device 4 moves to the storage position along the base boom 1a, and the cable 7 on the winding drum 4c the motor 4
By unwinding at step b, the hole digging device 4 is extended to the working position.

Further, the center portion of a hanging member 8 is rotatably pivoted to one side of the support frame 5, and an engaging member 9 that can be engaged with the base boom side hook 8a of the hanging member 8 is attached to the base boom 1a. At the same time, an engaging pin 10 that can be engaged with the hook 8b on the telescopic boom side of the hooking member 8 is provided protruding from the tip of the foremost boom 1c, and the hooking member 8 is attached by a spring member 11 as shown in FIG. The guiding portion is biased clockwise in the direction of rotation, while the proximal end of the drilling device 4 slides into contact with the device 4 in the process of displacing from the front of the storage position to the storage position to rotate the locking member 8 counterclockwise. 8c is formed on the hooking member 8. 1 is the base boom 1a
An inverted U-shaped longitudinal groove 12a with an opening at the lower end is formed in a bracket fixed to one side of the auger shaft 4a, into which the auger shaft 4a is fitted in the retracted position. A base end portion of a substantially diamond-shaped support piece 13 is rotatably attached to one side of the bracket 12, and a recess 13a is formed at the tip end of the support piece 13, which can engage with the auger shaft 4a. Further, a spring member 14 is stretched between the base end of the support piece 13 and the bracket 12 to urge the recess 13a of the support piece 13 to face the lower end opening of the longitudinal groove 12a.

Reference numeral 15 denotes a lashing device for lashing the support piece 13 at the engagement position with the auger shaft 4a, which includes a lashing piece 16 that can engage with the lower outer edge of the support piece 13 at the engagement position with the auger shaft 4a. This lashing piece 16 is supported at the lower end, and is provided with a support rod 17 rotatably disposed along the bracket 12, and an operation rod 18 that rotates the support rod 17. base boom 1
The rod 1 is disposed so as to be movable in the axial direction of the base boom 1a with a portion protruding into the support frame 5 from the tip of the rod 1a.
The rear end of the rod 8 is connected to the support rod 17 by a connecting member 19, and the rod 18 is biased forward by a spring member 20, in other words, in the direction of engaging the lashing piece 16 with the support piece 13.

21 is a rod 1 attached to the tip of one side of the foremost boom 1c.
8, the rod 18 is moved rearward with the foremost boom 1c in a fully contracted state, and the lashing piece 16 is rotated to a position where it does not engage with the support piece 13.

In addition, in the above embodiment, the support frame 5 of the hole digging device 4
can be hooked to the tip of the foremost boom 1c, but if it is to be hooked to the tip of the intermediate boom 1b, the engaging pin 10 and the pressing pin 21
is provided on the intermediate boom 16.

Next, the operation of the above embodiment will be explained.

When the foremost boom 1c is not fully retracted, the pressing pin 21 is separated from the tip of the operating rod 18,
Since the lashing piece 16 is in the engagement position with the support piece 13, when the drilling device 4 is in the retracted position, the auger shaft 4
a is engaged with and held in the recess 13a of the support piece 13 within the longitudinal groove 12a. Note that crane work is performed in this state.

On the other hand, when the first boom 1c comes to the fully retracted position, the pressing pin 21 presses the operating rod 18 backward against the spring member 20, rotates the support rod 17 in one direction, and connects the lashing piece 16 and the support piece 13. Since the engaged state is released, the support piece 13 becomes rotatable. Here, when the cable 7 is wound around the winding drum 4c of the drilling device 4 and the auger shaft 4a is pulled up slightly above its storage position, the support piece 13 rotates upward and engages with the auger shaft 4a. Since the relationship is canceled, now take up the winding drum 4.
When the cable 7 is unwound from c, the auger shaft 4a is in the longitudinal groove 1.
Pull it out from 2a and extend it to the working position side. and,
Due to the extension of the auger shaft 4a, the engagement state of the locking member 8 with the guide portion 8c is also released, and the locking member 8 is rotationally biased by the spring member 11 to lock the hook 8.
a disengages from the engaging member 9 of the base boom 1a, the hook 8b engages with the engaging pin 10 of the foremost boom 1c, and the support frame 5 is hooked to the tip of the foremost boom 1c.

Therefore, in this state, digging work is performed by the drilling device 4 which extends the foremost boom 1c together with the intermediate boom 1b and suspends it from the tip of the foremost boom 1c.
At this time, the operating rod 18 is returned to its original forward position by the spring member 20, and the securing piece 16 is also rotated to its original engagement position, but the support piece 13 is not secured because its tip is facing downward. The binding pieces 16 are not engaged and are in a superposed state.

After the hole digging work, the first boom 1c and the intermediate boom 1b are returned to the fully retracted state, and the winding drum 4c is
When the cable 7 is wound up, the drilling device 4 moves to the base boom 1a.
The auger shaft 4a reaches the open end of the vertical groove 12a, engages the tip of the support piece 13, and rotates against the spring member 14 to open the vertical groove 1.
2a, and is engaged and held in the recess 13a. Further, the support frame 5 of the hole-digging device 4 is moved to the maximum position when the hole-digging device 4 engages with the guide portion 8c of the hooking member 8 and the hooking member 8 is rotated counterclockwise against the spring member 11. The latch relationship with the front boom 1c is released and the latch is hooked on the base boom 1a.

As explained above, the safety device of the present invention is provided with a support piece for holding the digging device in a retracted state and a lashing device for lashing this support piece in an engagement position with the digging device, and the lashing device Since the structure is such that the lashing state with the support piece is released only when the telescopic boom is fully retracted, the drilling equipment cannot be extended from its storage position to the working position, or it cannot be retracted until the telescopic boom is fully retracted. This allows the support frame of this drilling equipment to be selectively latched to the base boom and the telescopic boom via the latching mechanism. This prevents the extremely dangerous situation of the drilling equipment falling due to work being carried out with the supporting frame of the drilling equipment not completely latched onto the telescopic boom, like in a car, and improves work safety. can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the boom part of the drilling device of the present invention in the stored state, Fig. 2 shows an embodiment of the safety device, and is a partially enlarged side view immediately before the multi-stage boom is fully retracted; The figure is a plan view of FIG. 2, and FIG. 4 is a sectional view taken along the line -- of FIG. 1...Multi-stage boom, 1a...Basic boom, 1b...
...Intermediate boom, 1c...Top boom, 2...Support member, 3...Hydraulic silling, 4...Drilling device, 4
a... Auger shaft, 4b... Motor, 4c... Winding drum, 5... Support frame, 6... Universal joint, 7...
Cable, 8...Latching member, 8a, 8b...Hook,
8c... Guide portion, 9... Engaging member, 10... Engaging pin, 11, 14, 20... Spring member, 12...
Bracket, 12a... Longitudinal groove, 13... Support piece, 13a... Recess, 15... Lagging device, 16...
... lashing piece, 17 ... support rod, 18 ... operation rod, 19 ... connection member, 21 ... press.

Claims (1)

[Claims] 1. A multi-stage boom that can be freely raised and lowered on the chassis is composed of a base boom and a telescopic boom that is telescopically inserted into the base boom, and a support frame that is connected to the base end of the drilling equipment so that it can be suspended. is inserted into the telescopic boom so as to be movable in the axial direction, the support frame is equipped with a latching mechanism that can selectively be latched to the base boom and the telescopic boom, and the base boom has a latching mechanism along the base boom. A support piece is provided to hold the digging device in a retracted state, and a lashing device is installed to secure the support piece in a position where it engages with the digging device, and the lashing device secures the entire length of the telescopic boom. 1. A safety device for a pole-erecting vehicle equipped with a hole-digging device, characterized in that the hole-digging device is configured to release the lashing state with the support piece only when the hole-digging device is retracted.