JP2573122Y2 - Hydraulic circuit of construction machinery - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention uses various attachments .
The present invention relates to a hydraulic circuit of a construction machine that can be replaced .

[0002]

2. Description of the Related Art FIG. 4 is a side view of a dismantling machine for dismantling structures such as buildings. In the figure, reference numeral 1 denotes a hydraulic excavator body (hereinafter, referred to as hydraulic excavator 1) which is a construction machine;
Is a super long attachment attached to the front part of the excavator 1, 3 is a joint boom of the super long attachment 2, 4 is an int boom, 5 is an arm, 6 is a crushing tool, 7 is a base end side of the joint boom A boom, 8 is a relay boom, 9 is a distal end boom, 10 is a boom cylinder of various hydraulic cylinders, 11 is an intub boom cylinder,
Reference numeral 12 denotes an arm cylinder, and reference numeral 13 denotes a bucket cylinder (a hydraulic cylinder for the crushing tool 6 but referred to as a bucket cylinder). FIG. 5 shows the proximal boom 7 viewed from A in FIG.
It is a principal part rear view. In the figure, reference numerals 14 and 14 'denote pipes leading to a bottom-side oil chamber of the arm cylinder 12, reference numeral 15 denotes a slow return valve provided between pipes 14 and 14', and reference numerals 16 and 1.
6 'is a pipe communicating with the rod-side oil chamber of the bucket cylinder 13, 17 is a slow return valve interposed in the pipe 16-16', and 10 and 10 are a pair of left and right boom cylinders. FIG. 6 is a perspective view of a main part of the base boom 7 viewed from B in FIG. 4. In FIG. 6, reference numerals 18 and 19 denote throws provided in pipes communicating with bottom oil chambers of the boom cylinders 10 and 10, respectively. It is a return valve.

FIG. 7 is a hydraulic circuit diagram of a main part of a conventional dismantling machine. In the drawing, 20 is a swing motor, 21 is a swing pilot switching valve, 22L and 22R are left and right traveling direction switching valves, 23 is an arm pilot switching valve, 24 is a boom pilot switching valve, and 25 is a bucket pilot switching. Valves 26 and 27 are first and second pumps, 28 is a pilot pump, 29 is a boom hydraulic remote control valve, 30, 31
Is a pilot valve of the hydraulic remote control valve 29, 32 is a hydraulic remote control valve for the arm, 33 and 34 are pilot valves of the hydraulic remote control valve 32, 35 is a straight traveling valve, and symbols Ei, Loro, Harha, and Nini are pilot lines. Shows the connection. The slow return valves 15, 17,
Reference numerals 18 and 19 denote variable throttle portions (for example, the variable throttle portion 3 in the slow return valve 15) as shown in FIG.
6) and a check valve (for example, the check valve 37 in the slow return valve 15) are connected in parallel. When the joint portion of the ultra-long attachment 2 is bent and rotated in a predetermined forward direction, various hydraulic cylinders 10, 10, 1 are provided so that the operating speed does not increase.
Slow return valves 18 and 1 for 2 and 13 respectively
9, 15, and 17 are arranged.

[0004]

[Problem to be solved by the invention] Construction with crushing tools
The construction machinery is used for crushing high places such as buildings.
Equipped with a very long attachment. If the operating speed is high when the joint of the ultra-long attachment is bent and rotated forward, a fall-over accident may occur. The moving speed has been reduced. However, construction machinery when the <br/> doctor there by the work situation less dismantling amount of work, there is a case of carrying out the excavation work with the mounting sort the ultra-long attachment to short and small a backhoe for work attachment than that.
FIG. 8 is a side view showing a state in which the backhoe working attachment 48 has been replaced with the hydraulic excavator (1). In the figure, parts that can be used in common with the ultra-long attachment (2) are given the same reference numerals. 49 is a front arm, 38 is an arm, and 39 is a bucket. When excavation work or the like is performed by moving the backhoe work attachment 48 (hereinafter referred to as a backhoe attachment), the slow return valves 15, 17, 18, and 19 disposed on the base end boom 7 are removed to quickly operate various hydraulic cylinders. There is a need. In the related art, since the variable throttle unit is provided in the slow return valve, the adjustment unit of the variable throttle unit is manually rotated a considerable number of times to open the aperture of the throttle. For that reason, when replacing it with a super long attachment when performing demolition work again,
Previous SL plurality of slow return valves had to be re-set to a predetermined throttle opening degree. Work to be set in this predetermined aperture degree spicy that operation to do fine adjustment Uno Ban, also resulting in poor efficiency of the attaching work for replacing to take a large becomes time fine adjustment of the plurality of slow return valve . The present invention solves the above-mentioned problems by using hydraulics for construction machinery .
It is intended to provide a circuit .

[0005]

According to the present invention, a front part is provided.
Can be installed selectively by setting multiple articulated attachments
Function of construction equipment,
A hydraulic cylinder for bending and rotating the joint, and the hydraulic cylinder
A pump for supplying pressurized oil to the pump, and the pump and the hydraulic system.
A hydraulic cylinder circuit that communicates with the cylinder;
With a throttle and a check valve located in the
A slow return valve and the throttle of the hydraulic cylinder circuit;
ー Bypass line connecting the upstream and downstream sides of the return valve
And an on-off valve in the bypass line.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a main part of a proximal boom 7A equipped with the hydraulic circuit of the present invention. In FIG. 1 , components using the same components as those of the prior art are denoted by the same reference numerals. 10 is a boom cylinder, 15 is a slow return valve, 40 is a stop valve which is an embodiment of an open / close valve, 4
1 is a bypass line having a stop valve 40,
Reference numeral 42 denotes a bypass pipe having a stop valve 43. FIG. 2 is a perspective view of a main part of the proximal boom 7A as viewed from FIG. In the figure, 44 is a stop valve 45
Bypass line provided with a, 46 a bypass line provided with a stop valve 47. FIG. 3 shows the hydraulic circuit of the present invention.
1 is a hydraulic circuit diagram of a main part of a dismantling machine as an embodiment of a construction machine having a road . In FIG. 3 , the same reference numerals are given to components using the same components as the conventional technology.

Next, the configuration of a hydraulic circuit according to an embodiment of the present invention will be described with reference to FIGS. The hydraulic circuit of the present invention is provided for each of the slow return valves 18, 19, 15, and 17 disposed in the hydraulic cylinder circuits of the boom cylinders 10, 10, the arm cylinder 12, and the bucket cylinder 13, respectively. The case of the return valve 15 will be described. Parallel with the slow return valve 15
A bypass pipe 41 having no throttle effect is provided in the
A stop valve 40 is provided in the middle of the
For example, when the demolition machine carries out the dismantling work wearing the ultra-long attachment 2, before Symbol in a state close the stop valve 40, carried out the excavation work wearing the short and small a backhoe attachment 48 is also the demolition machine than it Sometimes
It was to the previous Symbol stop valve 40 in the open state.

Next, the operation of the hydraulic circuit according to the present invention will be described. In one embodiment of the present invention, when a demolition machine performs dismantled by mounting the super long attachment 2 to the closed state stop valve 40. Bypass line 41
Since communication is blocked in front Symbol stop valve 40,
The work discharged from various cylinders 10, 10, 12, 13
Fluid is supplied to the slow return valves 18, 19, 15, 17
Is passed through the fixed throttle section.
The operating speed of the various cylinders decreases,
The extremely long attachment 2 can be bent and rotated safely. And the sometimes demolition machine Ru mounted <br/> sort the super long attachment 2 to the backhoe attachment 48, the pre-Symbol stop valve 40 in the open state. The bypass pipes are in communication with each other,
Hydraulic oil discharged from the seed cylinder before being opened
Because through the serial stop valve 40 and the bypass line, normal work the various cylinders not receiving throttling effect
Since a return to the dynamic speed, the demolition machine bending rotational speed does not interfere with such excavation work is obtained. Then again
The dismantling machine is in front of the backhoe attachment 48 again.
When replacing the extra long attachment 2
Operating the stop valve 40 again to the closed state;
To safely bend the ultra-long attachment 2
The operating speed to be moved is obtained. Note since opening and closing operation of the strike <br/> Ppubarubu 40 can easily and short time, thereby improving the efficiency of mounting work for replacing the super long attachment 2 and the backhoe attachment 48.

[0009]

[Effects of the Invention] In the hydraulic circuit of the present invention, the
Adjustment of the aperture of the variable throttle that requires much time and labor
Valve that can be operated easily and in a short time without performing
Only by opening and closing operation, it is possible to selectively use the throttle section and bypass line.
The operating speed of the cylinder can be adjusted.
It is possible to improve the efficiency of the mounting replacement work of that attachment. It is also possible to replace an expensive variable stop with an inexpensive fixed stop set at a predetermined aperture.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a proximal boom equipped with a hydraulic circuit according to an embodiment of the present invention .

FIG. 2 is a perspective view of a main part of the proximal boom viewed from C in FIG. 1;

FIG. 3 is a main part hydraulic circuit diagram of the construction machine according to one embodiment of the present invention .

FIG. 4 is a side view of the dismantling machine.

FIG. 5 is a rear view of a main part of the proximal end boom of the prior art as viewed from A in FIG. 4;

FIG. 6 is a perspective view of a main part of the proximal end boom of the prior art as viewed from B in FIG. 4;

FIG. 7 is a hydraulic circuit diagram of a main part of the prior art of the dismantling machine.

FIG. 8 is a side view showing a state in which the super long attachment of the demolition machine is replaced with a backhoe attachment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 (of hydraulic excavator) 2 Super long attachment 5, 38 Arm 6 Crushing tool 7, 7A Base end boom 10 Boom cylinder 12 Arm cylinder 13 Bucket cylinder 15, 17, 18, 19 Slow return valve 36 Variable throttle section 37 Check Valve 39 Bucket 40, 43, 45, 47 Stop valve (open / close valve) 41, 42, 44, 46 Bypass line 48 Backhoe work attachment

Claims (1)

(57) [Scope of request for utility model registration] A plurality of articulated attachments are provided on a front portion.
In construction machinery that allows you to set
A hydraulic system that bends and rotates the joint of each attachment
A pump for supplying hydraulic oil to the cylinder and the hydraulic cylinder
And a hydraulic system communicating the pump with the hydraulic cylinder.
A restrictor disposed in the cylinder circuit and the hydraulic cylinder circuit;
A slow return valve having a section and a check valve;
Upstream and below the slow return valve in the hydraulic cylinder circuit
A bypass line communicating with the flow side, and a bypass line connected to the bypass line.
And an on-off valve disposed on the construction machine.
Hydraulic circuit .