KR102372192B1 - Excavator drive system with rotary link and bucket grab and Excavator with the drive system - Google Patents

Abstract

The present invention relates to an excavator drive system having a rotary link and tongs, and an excavator to which the drive system is applied. The excavator driving system includes: first and second hydraulic supply hoses connected in parallel to a hydraulic source; normally open first and second direction switching valves connected to the first and second hydraulic supply hoses; first and second clamp connection lines connected to the first and second direction selector valves and transmit hydraulic pressure passing through the first and second direction selector valves to the clamps; first and second rotary link connecting lines for connecting the first and second hydraulic supply hoses to the rotary link and transmitting hydraulic pressure to the rotary link when the first and second direction switching valves are blocked; and a selection switch module operated by an operator to output a signal to block the first and second direction switching valves.
The excavator driving system having the rotary link and tongs of the present invention made as described above can simply implement the selective use of the rotary link and the tongs by using a changeover switch provided on the control stick of the driver's seat, and the overall structure is not complicated. Renovation cost is very low and maintenance is easy.

Description

Excavator drive system having a rotary link and tongs and an excavator to which the drive system is applied

The present invention relates to an excavator having a rotary link and tongs installed, and more particularly, driving an excavator equipped with a rotary link and tongs that enables easy selection and use of the rotary link and tongs through a changeover switch mounted on a control stick. It relates to a system and an excavator to which the drive system is applied.

An excavator, commonly called a fork crane, is an important field equipment capable of performing various tasks, such as excavation work to dig the ground, loading work to put soil on a dump truck, shredding work to dismantle buildings, and stationary work to clean the ground.

It has the basic structure of a chassis with an engine, a vehicle body mounted on the chassis and pivotable, a cab located on the vehicle body, a boom connected to the vehicle body and extending in the longitudinal direction, an arm linked to the boom stem, and a bucket mounted on the end of the arm. .

In addition to the bucket, various equipment are detachably connected to the arm as needed. For example, several mounting devices such as a crusher, hammer, breaker, shear, tongs, etc. can be selectively used. The above-described various mounting equipment, fixed to the arm, operates by hydraulic pressure output from the hydraulic pressure source of the excavator.

In addition, depending on the type of excavator, a rotary link is installed between the end of the arm and the above-described mounting equipment. The rotary link consists of a worm, a worm wheel and a hydraulic motor, and receives the hydraulic pressure transmitted from the hydraulic source and outputs rotational force to rotate the mounted equipment.

However, the above-mentioned various mounting equipment, that is, a crusher, a hammer, a breaker, a cutter, a tongs, a rotary link, etc. have their allowable pressures determined according to their structures and uses. For example, in the case of a breaker or cutting tongs, the pressure provided from the hydraulic source is strong because a strong force must be output. Rather, if you apply high pressure (like that applied to a breaker or cutting tongs) to the rotary link, the motor cannot withstand it and may be damaged.

On the other hand, the above-described mounting equipment is an option, in order to install the mounting equipment on the basic excavator, that is, to convert the excavator and the mounting equipment to a state in which the equipment can be operated, a hydraulic line is newly established and hydraulic parts and You need to install an amp, controller, etc. Of course, such remodeling takes a lot of money and time. Also, as the number of parts increases, the probability of failure or hydraulic oil leakage increases, making maintenance cumbersome.

Domestic Utility Model Publication No. 20-0488397 (Power transmission device of excavator bucket rotary link) Domestic Patent Publication No. 10-1957105 (Rotating link system for excavator arm) Domestic Patent Publication No. 10-2013-0140379 (Rotary Bucket Device for Excavator)

The present invention was created to solve the above problems, and it is possible to simply implement the selective use of the rotary link and tongs, the overall structure is not complicated, the remodeling cost is very low, and the maintenance is easy. An object of the present invention is to provide an excavator driving system and an excavator to which the driving system is applied.

An excavator drive system having a rotary link and tongs of the present invention as a means of solving the problems for achieving the above object is a vehicle body having a hydraulic source and a cab for outputting hydraulic pressure, a boom connected to the vehicle body, and a link to the extension end of the boom It is installed in an excavator that includes an arm that becomes an arm, a tong installed on the arm, and a rotary link mounted on an end of the arm, so that the rotary link and the tongs can be selectively used, which is connected in parallel to the hydraulic source a first hydraulic supply hose and a second hydraulic supply hose; a normally open first directional switching valve connected to the first hydraulic supply hose; a normally open second direction switching valve connected to the second hydraulic supply hose; a first clamp connection line connected to the first direction selector valve and transmit the hydraulic pressure passing through the first direction selector valve to the clamp; a second clamp connection line connected to the second direction selector valve and transmit the hydraulic pressure passing through the second direction selector valve to the clamp; a first rotary link connecting line connecting the first hydraulic supply hose and the rotary link and transmitting hydraulic pressure to the rotary link when the first directional selector valve is blocked; a second rotary link connecting line connecting the second hydraulic supply hose and the rotary link and transmitting hydraulic pressure to the rotary link when the second directional selector valve is blocked; and a selection switch module operated by an operator to output a signal to block the first and second direction switching valves.

In addition, the selection switch module; It is installed on the control stick located inside the cab, and has a clamp selection switch and a rotation link selection switch.

In addition, in the connection portion of the first hydraulic supply hose and the first rotary link connection line and the second hydraulic supply hose and the second rotary link connection line, the first and second direction switching valves are blocked in an open state and a three-way valve that is opened in a state in which the first and second direction switching valves are blocked is further installed.

An excavator drive system having a rotary link and tongs of the present invention as a means of solving the problems for achieving the above object is a vehicle body having a hydraulic source and a cab for outputting hydraulic pressure, a boom connected to the vehicle body, and a link to the extension end of the boom It is installed in an excavator that includes an arm that becomes an arm, a tong installed on the arm, and a rotary link mounted on an end of the arm, so that the rotary link and the tongs can be selectively used, which is connected in parallel to the hydraulic source a first hydraulic supply hose and a second hydraulic supply hose; a normally open first directional switching valve connected to the first hydraulic supply hose; a normally open second direction switching valve connected to the second hydraulic supply hose; a first clamp connection line for connecting the first directional selector valve and the clamp, and transmitting the hydraulic pressure that has passed through the first direction selector valve to the clamp; a second clamp connecting line connecting the second direction selector valve and the clamp, and transferring the hydraulic pressure passing through the second direction selector valve to the clamp; a normally closed third direction switching valve connected to the first hydraulic supply hose through the first induction line and connected to the rotary link through the first rotary link connection line; a normally closed fourth direction switching valve connected to the second hydraulic supply hose through the second induction line and connected to the rotary link through the second rotary link connection line; and a selection switch module operated by an operator to simultaneously output electrical signals to the first, second and third-way switching valves and to transmit hydraulic pressure to the rotary link.

In addition, the selection switch module; It is installed on the control stick located inside the cab, and has a clamp selection switch and a rotation link selection switch.

In addition, the first and second rotation link connection line, an overload prevention unit for blocking the increase of more than the set value of the hydraulic pressure transmitted to the rotation link is further mounted.

In addition, between the selection switch module and the first, second, third, and fourth direction switching valves; A relay is installed that simultaneously transmits or blocks electrical signals to the first and second directional selector valves and the third and fourth directional selector valves.

In addition, the excavator of the present invention includes: a chassis capable of running on the ground; a vehicle body positioned on the upper portion of the chassis so as to be able to pivot, and having a hydraulic pressure source for outputting hydraulic pressure and a cab; a boom connected to the chassis; an arm linked to the extended end of the boom; tongs installed on the arm; a rotation link rotatably installed at an end of the arm; A first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source, a normally open first directional selector valve connected to the first hydraulic supply hose, and a normally open first hydraulic supply hose connected to the second hydraulic supply hose A two-way selector valve, a first clamp connection line that is connected to the first direction selector valve and transmits the hydraulic pressure that has passed through the first direction selector valve to the clamp, and a second direction selector valve connected to the second direction selector valve A second clamp connection line that transmits the passed hydraulic pressure to the clamp, a first rotation link connection line that connects the first hydraulic supply hose and the rotation link, and transmits the hydraulic pressure to the rotation link when the first direction switching valve is blocked; A second rotary link connection line that connects the second hydraulic supply hose and the rotary link and transmits hydraulic pressure to the rotary link when the second direction selector valve is blocked, which is operated by an operator to block the first and second way selector valves and a drive system having a selection switch module for outputting a signal.

In addition, the selection switch module; It is installed on the control stick located inside the cab, and has a clamp selection switch and a rotation link selection switch.

In addition, in the connection portion of the first hydraulic supply hose and the first rotation link connection line and the connection portion of the second hydraulic supply hose and the second rotation link connection line, the first and second direction switching valves are blocked in an open state, , a three-way valve that is opened in a state in which the first and second direction switching valves are blocked is further installed.

In addition, the excavator of the present invention includes: a chassis capable of running on the ground; a vehicle body positioned on the upper portion of the chassis so as to be able to pivot, and having a hydraulic pressure source for outputting hydraulic pressure and a cab; a boom connected to the chassis; an arm linked to the extended end of the boom; tongs installed on the arm; a rotation link rotatably installed at an end of the arm; a first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source; a normally open first directional switching valve connected to the first hydraulic supply hose; a normally open second direction switching valve connected to the second hydraulic supply hose; a first clamp connection line for connecting the first directional selector valve and the clamp, and transmitting the hydraulic pressure that has passed through the first direction selector valve to the clamp; a second clamp connecting line connecting the second direction selector valve and the clamp, and transferring the hydraulic pressure passing through the second direction selector valve to the clamp; a normally closed third direction switching valve connected to the first hydraulic supply hose through the first induction line and connected to the rotary link through the first rotary link connection line; a normally closed fourth direction switching valve connected to the second hydraulic supply hose through the second induction line and connected to the rotary link through the second rotary link connection line; and a selection switch module operated by an operator to simultaneously output electrical signals to the first, second and third-way switching valves and to transmit hydraulic pressure to the rotary link.

In addition, the selection switch module; It is installed on the control stick located inside the cab, and has a clamp selection switch and a rotary link selection switch.

In addition, the first and second rotation link connection line, an overload prevention unit for blocking the increase of more than the set value of the hydraulic pressure transmitted to the rotation link is further mounted.

In addition, between the selection switch module and the first, second, third, and fourth direction switching valves; A relay is installed that simultaneously transmits or blocks electrical signals to the first and second directional selector valves and the third and fourth directional selector valves.

The excavator driving system having the rotary link and tongs of the present invention made as described above can simply implement the selective use of the rotary link and the tongs by using a changeover switch provided on the control stick of the driver's seat, and the overall structure is not complicated. Renovation cost is very low and maintenance is easy.

1 is a side view of an excavator to which an excavator driving system having a rotary link and tongs according to a first embodiment of the present invention is applied.
2 is a circuit diagram showing the structure of an excavator driving system having a rotary link and tongs according to a first embodiment of the present invention.
3A and 3B are block diagrams for explaining the configuration and operation of an excavator driving system having a rotary link and tongs according to the first embodiment of the present invention.
4 is a side view of an excavator to which an excavator driving system having a rotary link and tongs according to a second embodiment of the present invention is applied.
5 is a circuit diagram for explaining the structure of an excavator driving system having a rotary link and tongs according to a second embodiment of the present invention.
6A and 6B are block diagrams for explaining the configuration and operation method of an excavator driving system having a rotary link and tongs according to a second embodiment of the present invention.

Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a side view of an excavator to which an excavator driving system having a rotary link and tongs according to a first embodiment of the present invention is applied, and FIG. 2 is a circuit diagram showing the structure of the excavator driving system. In addition, Figures 3a and 3b is a block diagram for explaining the configuration and operation of the excavator drive system having a rotary link and tongs according to the first embodiment of the present invention.

Basically, the excavator 10 according to the first embodiment includes: a chassis capable of running on the ground; a vehicle body positioned on the upper portion of the chassis so as to be able to pivot, and having a hydraulic pressure source for outputting hydraulic pressure and a cab; a boom connected to the chassis; an arm linked to the extended end of the boom; tongs installed on the arm; a rotation link rotatably installed at an end of the arm; A first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source, a normally open first directional selector valve connected to the first hydraulic supply hose, and a normally open first hydraulic supply hose connected to the second hydraulic supply hose A two-way selector valve, a first clamp connection line that is connected to the first direction selector valve and transmits the hydraulic pressure that has passed through the first direction selector valve to the clamp, and a second direction selector valve connected to the second direction selector valve A second clamp connection line that transmits the passed hydraulic pressure to the clamp, a first rotation link connection line that connects the first hydraulic supply hose and the rotation link, and transmits the hydraulic pressure to the rotation link when the first direction switching valve is blocked; A second rotary link connection line that connects the second hydraulic supply hose and the rotary link and transmits hydraulic pressure to the rotary link when the second direction selector valve is blocked, which is operated by an operator to block the first and second way selector valves and a selection switch module for outputting a signal.

As shown, the excavator 10 according to the first embodiment includes a chassis 14, a vehicle body 15, a boom 12, an arm 13, a clamp 33, a rotary link 35, a bucket ( 17), a drive system 20 is provided.

The chassis 14 is provided with an engine (not shown) and wheels 16 and can be driven on the ground. In addition, the vehicle body 15 has a low-pressure hydraulic source (31 in FIG. 2 ) and a cab 11 as a part installed to be able to pivot on the upper portion of the chassis 14 . The low pressure hydraulic pressure source 31 includes a hydraulic tank (not shown) and a hydraulic pump (not shown), and is a hydraulic pressure supply means for outputting a pressure of 180 bar or less. The driving system 20 of the first embodiment means that it is suitable for the excavator 10 of a small size having a low-pressure hydraulic source.

The cab 11 is a space where the operator is located, and the control stick 21 is located. The operator riding in the cab 11 controls the excavator 10 using the control stick 21 . In particular, the selection switch module 23 is mounted on the control stick 21 . In FIG. 1 , the control stick 21 is enlarged and illustrated outside the cab 11 for convenience, but the control stick 21 is naturally located inside the cab 11 .

The selection switch module 23 is a switch that determines whether to use the tongs 33 or the rotary link 35 as some components of the drive system 20 according to the present embodiment. This will be described later.

The boom 12 is connected to the vehicle body 15, extends in a curved state, and has an arm 13 at its extended end. The boom 12 is rotated up and down by a hydraulic actuator. In addition, the arm 13 is connected to the end of the boom 12 , and the tongs 33 and the rotation link 35 are installed in the arm 13 .

The tongs 33 are operated by hydraulic pressure supplied through first and second tongs connecting lines 29a and 29b, which will be described later, to clamp and fix the object between the bucket 17 and the tongs. In addition, the rotary link 35 operates by hydraulic pressure transmitted through the first and second rotary link connection lines 29c and 29d to output a rotational force. In addition, the bucket 17 is detachably coupled to the rotary link 35 . The bucket 17 can be removed and other equipment can be installed.

On the other hand, the drive system 20, which allows the rotary link 35 and the tongs 33 to be selectively used, has the configuration and operation characteristics shown in FIG. 2 .

As shown, the drive system 20 includes a first hydraulic supply hose 31a and a second hydraulic supply hose 31b, a normally open first directional selector valve 27, and a normally open second directional selector valve 28 ), a first clamp connection line 29a, a second clamp connection line 29b, a first rotation link connection line 29c, a second rotation link connection line 29d, and a selection switch module 23.

The selection switch module 23 is fixed to the control stick 21 through the switch holder 23a. By installing the selection switch module 23 on the control stick 21 that must be held anyway in order to operate the excavator 10, the operator can operate the selection switch module 23 simultaneously while driving the excavator 10.

The selection switch module 23 includes a clamp selection switch 23b and a rotation link selection switch 23c. The forceps selection switch 23b is a switch operated when the forceps 33 are used, and the rotation link selection switch 23c is a switch operated to use the rotation link 35 . The tongs 33 and the rotary link 35 are not used at the same time, but are used selectively. That is, when using the tongs 33, the rotary link 35 cannot be used, and when the rotary link 35 is used, the tongs 33 cannot be used. As long as such a function can be provided, the switching method of the selection switch module 23 can be implemented in various ways.

The first hydraulic supply hose (31a) and the second hydraulic supply hose (31b) are hydraulic lines connected in parallel to the low-pressure hydraulic source (31). The flow rate and hydraulic pressure of hydraulic oil passing through the first hydraulic supply hose (31a) and the second hydraulic supply hose (31b) are the same as each other.

The first directional selector valve 27 and the second directional selector valve 28 are connected to the selection switch module 23 through the signal cable 24 as valves having the same structure and operation method. The first and second direction switching valves 27 are normally open valves. It is opened in a state where no control signal is received from the outside, and operates as soon as an electric signal is input and is blocked. In other words, it is blocked when the operator operates the rotary link selection switch 23c, and is opened when the operator operates the tongs selection switch 23b. The forceps selection switch 23b serves to cut off the electrical signal output from the rotary link selection switch 23c.

In addition, the first clamp connection line (29a) connects the first direction selector valve 27 and the forceps 33, and the second clamp connection line 29b connects the second direction selector valve 28 and the forceps 33 It is a hydraulic hose that For convenience of explanation, the first and second clamp connection lines 29a and 29b are said to be connected to the tongs 33 , but they are actually connected to the hydraulic actuator 33a for driving the tongs 33 . Two ports (not shown) are located in the cylinder of the hydraulic actuator, and the first clamp connection line 29a and the second clamp connection line 29b are connected to each port.

The first rotary link connection line (29c) connects the first hydraulic supply hose (31a) and the rotary link (35), and the second rotary link connection line (29d) connects the second hydraulic supply hose and the rotary link (35). It is a hydraulic hose. The first and second rotary link connection lines 29c and 29d serve to guide the hydraulic pressure of the low pressure hydraulic pressure source 31 to the rotary link 35 when the first and second direction switching valves 27 and 28 are blocked. do.

In addition, a three-way valve ( 25) is installed. The three-way valve 25 is a valve that is shut off when the first and second-way switching valves are opened, and is opened when the first and second-way switching valves are closed.

3A and 3B are block diagrams for explaining the configuration and operation of an excavator driving system having a rotary link and tongs according to the first embodiment of the present invention.

3A is a case in which the tongs selection switch 23b is turned on. As the clamp selection switch 23b is selected, the hydraulic pressure supplied from the low pressure hydraulic pressure source 31 is the first and second hydraulic supply hoses 31a and 31b, the first and second direction switching valves 27 and 28, and , is transmitted to the tongs 33 through the second clamp connection lines 29a and 29b in parallel. It will be in a state where the tongs can be operated.

At this time, the three-way valve 25 blocks the hydraulic pressure from passing to the first and second rotary link connection lines 29c and 29d, so that the hydraulic pressure is not transmitted to the rotary link 35 .

3B is a case in which the rotary link selection switch 23c is turned on. By operating the rotary link selection switch 23c, the first and second direction switching valves 27 and 28 are cut off, and the hydraulic pressure passes through the three-way valve 25 to the first and second rotary link connection lines 29c and 29d. is transmitted to The rotary link 35 will operate.

When the clamp selection switch 23b is operated again in this state, as shown in FIG. 3A , the hydraulic pressure is again transmitted to the tongs 33 and the hydraulic pressure transmitted to the rotary link 35 is cut off.

4 is a side view of an excavator 10 to which an excavator driving system having a rotary link and tongs according to a second embodiment of the present invention is applied, and FIG. 5 is a circuit diagram for explaining the structure of the excavator driving system 20. .

Hereinafter, the same reference numerals as the above reference numerals indicate the same members having the same function.

4 and 5 , the excavator 10 according to the second embodiment includes a vehicle body 15 having a drivable chassis 14 , a high-pressure hydraulic source 43 and a cab 11 , and a boom 12 . , an arm 13 , a clamp 33 , a rotary link 35 , and a drive system 40 .

In addition, the drive system 40 includes a first hydraulic supply hose 43a and a second hydraulic supply hose 43b connected in parallel to the high-pressure hydraulic source 43, and a normally open first connected to the first hydraulic supply hose. The direction selector valve 27, the normally open second direction selector valve 28 connected to the second hydraulic supply hose, the first clamp connection line 29a connecting the first direction selector valve and the clamp, the second direction selector valve A second clamp connection line (29b) connecting the tongs and the normally closed third direction switching valve (47) connected to the first hydraulic supply hose through the first induction line (51a), the second through the induction line 2 The normally closed fourth direction switching valve 48 connected to the hydraulic supply hose, the first rotation link connection line 29c connecting the third direction switching valve 47 and the rotation link 35, the fourth direction switching The second rotation link connection line 29d connecting the valve 48 and the rotation link 35, the overload prevention valve 49 connected to the first and second rotation link connection lines 29c and 29d, the selection switch module ( 23), a relay 41 is provided.

The high-pressure hydraulic pressure source 43 is a hydraulic pressure providing means for outputting a pressure higher than 180 bar, and includes a hydraulic tank (not shown) and a hydraulic pump (not shown).

The first and second hydraulic supply hoses 43a and 43b transfer the hydraulic pressure output from the hydraulic pressure supply source to the first and second direction switching valves 27 and 28 . In addition, the first induction line (51a) guides the hydraulic pressure inside the first hydraulic supply hose (43a) to the third direction selector valve (47) when the first direction selector valve (27) is blocked. The second guide line 51b guides the hydraulic pressure in the second hydraulic supply hose 43b to the fourth direction selector valve 48 when the second direction selector valve 28 is blocked.

The third and fourth direction switching valves 47 and 48 are normally closed valves, and are opened only when an electric signal is transmitted through the signal cable 45 . In particular, the 3rd and 4th direction selector valves 47 and 48 are blocked in the state in which the 1st and 2nd direction selector valves 27 and 28 are opened, and are opened in the blocked state.

The relay 41 is applied for simultaneous operation of the first and second directional selector valves 27 and 28 and the third and fourth directional selector valves 47 and 48. The relay 41 simultaneously applies electrical signals to the first and second-way switching valves 27 and 28 and the third and fourth-way switching valves 47 and 48. By the action of the relay 41, when the first and second directional selector valves 27 and 28 are opened, the third and fourth directional selector valves 47 and 48 are blocked. Also, when the first and second direction selector valves 27 and 38 are shut off, the third and fourth way selector valves 47 and 48 are opened.

The overload prevention valve 49 is connected to the first and second rotary link connection lines 29c and 29d, and serves to lower the hydraulic pressure toward the rotary link 35 . Since the rotary link 35 may be damaged when continuously receiving a pressure of 180 bar or more due to its structure, an overload prevention valve 49 is applied.

The excavator driving system 40 according to the second embodiment is a system applied to an excavator in which a high-output high-pressure hydraulic source 43 is installed. In the case of the first embodiment, since the low-pressure hydraulic source 31 is mounted on the excavator, the overload prevention valve 49 is not necessarily used.

The overload prevention valve 49 is a normal relief valve, and when the pressure of the first rotation link connection line 29c rises, the increased pressure is guided to the second rotation link connection line 29d. In addition, when the pressure of the second rotation link connection line (29d) rises, the increased pressure is induced to the first rotation link connection line (29c). Since the rotation link 35 outputs bidirectional rotation torque, one of the first and second rotation link connection lines 29c and 29d has a high pressure and the other has a relatively low pressure.

6A and 6B are block diagrams for explaining the operation of the excavator driving system 40 having a rotary link and tongs according to a second embodiment of the present invention.

6A is a case in which the tongs selection switch 23b is turned on. The hydraulic pressure supplied from the high-pressure hydraulic pressure source 43 by manipulating the tongs selection switch 23b is turned on, and the first and second hydraulic supply hoses 43a and 43b, the first and second direction switching valves 27 . It will be in a state where the tongs can be operated.

When the clamp selection switch 23b is pressed, the electrical signals transmitted to the first and second direction switching valves 27 and 28 and the third and fourth direction switching valves 47 and 48 are cut off at the same time by the action of the relay 41. will be. As mentioned above, since the first and second direction selector valves 27 and 28 are normally open valves and the third and fourth way selector valves 47 and 48 are normally closed valves, the above operation is possible.

As shown in FIG. 6b in the above state, when the rotary link selection switch 23c is turned on, the first, second, third, and fourth direction switching valves 27, 28, 47, and 48 by the action of the relay 41 At the same time, an electric signal is transmitted to the first and second direction selector valves 27 and 28, and the third and third way selector valves 47 and 48 are opened.

Hydraulic pressure provided from the high pressure hydraulic pressure source 43 is transmitted to the rotation link 35 through the third and fourth direction switching valves 47 and 48 through the first and second rotation link connection lines 29c and 29d. The rotary link 35 will operate. At this time, the overload prevention valve 49 lowers the hydraulic pressure transmitted to the rotary link 35 . The rotary link can operate smoothly under pressure conditions of 180 bar or less.

When the clamp selection switch 23b is operated again in this state, as shown in FIG. 6a , the hydraulic pressure is again transmitted to the clamp 33 and the hydraulic pressure transmitted to the rotary link 35 is cut off.

As mentioned above, although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above embodiments, and various modifications are possible by those of ordinary skill within the scope of the technical spirit of the present invention.

10: excavator 11: cab 12: boom stand
13: Arm 14: Chassis 15: Body
16: wheel 17: bucket 20: drive system
21: control stick 23: selection switch module 23a: switch holder
23b: Clamp selection switch 23c: Rotary link selection switch 24: Signal cable
25: 3-way valve 27: 1st directional selector valve 28: 2nd directional selector valve
29a: first clamp connection line 29b: second clamp connection line 29c: first rotation link connection line
29d: second rotation link connection line 31: low pressure hydraulic source 31a: first hydraulic supply hose
31b: second hydraulic supply hose 33: clamp 33a: hydraulic actuator
35: rotary link 40: drive system 41: relay
43: high pressure hydraulic hose 43a: first hydraulic supply hose 43b: second hydraulic supply hose
45: signal cable 47: third-way switching valve 48: fourth-way switching valve
49: overload check valve 51a: first induction line 51b: second induction line

Claims (14)

A vehicle body having a hydraulic source and a cab for outputting hydraulic pressure, a boom connected to the vehicle body, an arm linked to an extended end of the boom, tongs installed on the arm, and a rotary link mounted to the end of the arm. Installed in an excavator , As to enable the selective use of the rotary link and tongs,
a first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source;
a normally open first directional switching valve connected to the first hydraulic supply hose;
a normally open second direction switching valve connected to the second hydraulic supply hose;
a first clamp connection line connected to the first direction selector valve and transmit the hydraulic pressure passing through the first direction selector valve to the clamp;
a second clamp connection line connected to the second direction selector valve and transmit the hydraulic pressure passing through the second direction selector valve to the clamp;
a first rotary link connecting line connecting the first hydraulic supply hose and the rotary link and transmitting hydraulic pressure to the rotary link when the first directional selector valve is blocked;
a second rotary link connecting line connecting the second hydraulic supply hose and the rotary link and transmitting hydraulic pressure to the rotary link when the second directional selector valve is blocked;
Includes a selection switch module that is operated by a worker and outputs a signal to block the first and second direction switching valves,
In the connection portion of the first hydraulic supply hose and the first rotary link connection line, and in the connection portion of the second hydraulic supply hose and the second rotation link connection line,
An excavator driving system having a rotary link and tongs, which is further installed with a three-way valve that is shut off in the state in which the first and second direction selector valves are opened, and is opened in the state in which the first and second direction selector valves are blocked. According to claim 1,
The selection switch module;
Installed on the control stick located inside the cab, the excavator drive system having a tong selection switch and a rotation link selection switch, a rotation link and tongs. delete A vehicle body having a hydraulic source and a cab for outputting hydraulic pressure, a boom connected to the vehicle body, an arm linked to an extended end of the boom, tongs installed on the arm, and a rotary link mounted to the end of the arm. Installed in an excavator , As to enable the selective use of the rotary link and tongs,
a first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source;
a normally open first directional switching valve connected to the first hydraulic supply hose;
a normally open second directional switching valve connected to the second hydraulic supply hose;
a first clamp connection line for connecting the first directional selector valve and the tongs, and transmitting the hydraulic pressure that has passed through the first direction selector valve to the tongs;
a second clamp connection line for connecting the second direction selector valve and the clamp, and transferring the hydraulic pressure passing through the second direction selector valve to the clamp;
a normally closed third direction switching valve connected to the first hydraulic supply hose through the first induction line and connected to the rotation link through the first rotation link connection line;
a normally closed fourth direction switching valve connected to the second hydraulic supply hose through the second induction line and connected to the rotary link through the second rotary link connection line;
and a selection switch module operated by an operator to simultaneously output electrical signals to the first and second direction selector valves and the third and fourth way selector valves to transmit hydraulic pressure to the rotary link;
The selection switch module,
Installed on the control stick located inside the cab, the excavator drive system having a tong selection switch and a rotation link selection switch, a rotation link and tongs. delete 5. The method of claim 4,
In the first and second rotary link connection lines,
Excavator drive system having a rotary link and tongs, further equipped with an overload prevention unit that blocks an increase in hydraulic pressure transmitted to the rotary link above a set value. 5. The method of claim 4,
Between the selection switch module and the 1st, 2nd, 3rd and 4th direction switching valve;
An excavator drive system having a rotary link and tongs, in which a relay that simultaneously transmits or blocks electrical signals to the first and second directional selector valves and the third and fourth directional selector valves is installed. a chassis drivable on the ground;
a vehicle body positioned on the upper portion of the chassis so as to be able to pivot, and having a hydraulic pressure source for outputting hydraulic pressure and a cab;
a boom connected to the chassis;
an arm linked to the extended end of the boom;
tongs installed on the arm;
a rotation link rotatably installed at an end of the arm;
A first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source, a normally open first directional selector valve connected to the first hydraulic supply hose, and a normally open first hydraulic supply hose connected to the second hydraulic supply hose A two-way selector valve, a first clamp connection line that is connected to the first direction selector valve and transmits the hydraulic pressure that has passed through the first direction selector valve to the clamp, is connected to the second direction selector valve and includes a second direction selector valve A second clamp connection line that transmits the passed hydraulic pressure to the clamp, a first rotation link connection line that connects the first hydraulic supply hose and the rotation link, and transmits the hydraulic pressure to the rotation link when the first direction switching valve is blocked; A second rotary link connection line that connects the second hydraulic supply hose and the rotary link and transmits hydraulic pressure to the rotary link when the second direction selector valve is blocked, which is operated by an operator to block the first and second way selector valves A drive system having a selection switch module for outputting a signal to
In the connecting portion of the first hydraulic supply hose and the first rotary link connecting line and the connecting portion of the second hydraulic supply hose and the second rotary link connecting line,
An excavator further installed with a three-way valve that is shut off when the first and second-way switching valves are opened, and opened when the first and second-way switching valves are blocked. 9. The method of claim 8,
The selection switch module;
An excavator installed on a control stick located inside the cab and having a clamp selection switch and a rotation link selection switch. delete a chassis drivable on the ground;
a vehicle body positioned on the upper portion of the chassis so as to be able to pivot, and having a hydraulic pressure source for outputting hydraulic pressure and a cab;
a boom connected to the chassis;
an arm linked to the extended end of the boom;
tongs installed on the arm;
a rotation link rotatably installed at an end of the arm;
a first hydraulic supply hose and a second hydraulic supply hose connected in parallel to the hydraulic source;
a normally open first directional switching valve connected to the first hydraulic supply hose;
a normally open second direction switching valve connected to the second hydraulic supply hose;
a first clamp connection line for connecting the first directional selector valve and the clamp, and transmitting the hydraulic pressure that has passed through the first direction selector valve to the clamp;
a second clamp connecting line connecting the second direction selector valve and the clamp, and transferring the hydraulic pressure passing through the second direction selector valve to the clamp;
a normally closed third direction switching valve connected to the first hydraulic supply hose through the first induction line and connected to the rotary link through the first rotary link connection line;
a normally closed fourth direction switching valve connected to the second hydraulic supply hose through the second induction line and connected to the rotary link through the second rotary link connection line;
and a selection switch module operated by an operator to simultaneously output electrical signals to the first and second direction selector valves and the third and fourth way selector valves to transmit hydraulic pressure to the rotary link;
The selection switch module,
An excavator installed on a control stick located inside the cab and having a clamp selection switch and a rotation link selection switch. delete 12. The method of claim 11,
In the first and second rotary link connection lines,
An excavator further equipped with an overload prevention unit that blocks the increase of the hydraulic pressure delivered to the rotary link beyond the set value. 12. The method of claim 11,
Between the selection switch module and the 1st, 2nd, 3rd and 4th direction switching valve;
An excavator equipped with a relay that simultaneously transmits or blocks electrical signals to the 1st and 2nd direction switching valves and the 3rd and 4th direction switching valves.

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