KR102405660B1 - Swing brake apparatus for construction machinery - Google Patents

Abstract

The present invention relates to a swing brake device for an excavator that locks and unlocks an upper swing body with respect to a lower running body. The slewing brake device of the construction machine according to the present invention locks the upper revolving body so that it cannot turn when hydraulic oil is not supplied, and unlocks the upper revolving body so that the upper revolving body rotates when hydraulic oil is supplied. A hydraulic pump for supplying hydraulic oil to the hydraulic pump, a swing brake release line for supplying hydraulic oil discharged from the hydraulic pump to the swing brake cylinder, is provided on the swing brake release line, and blocks the supply of hydraulic oil to the swing brake cylinder A swing brake release valve whose position is switched by an electrical signal between a first position to release the supply of hydraulic oil to the swing brake cylinder and a second position to release the supply of hydraulic oil to the swing brake cylinder, and when a preset condition is satisfied, the swing brake release valve is locked and a control unit configured to output a release signal to change the position of the swing brake release valve to the second position.

Description

Slewing brake device for construction machinery {SWING BRAKE APPARATUS FOR CONSTRUCTION MACHINERY}

The present invention relates to a swing brake device for a construction machine, and more particularly, to a swing brake device for an excavator that locks and unlocks an upper swing body with respect to a lower running body.

In general, the excavator is installed so as to be able to turn on the lower moving body in order to improve the efficiency of the work and to expand the work range. The upper slewing body is locked and unlocked by the slewing brake device. When the upper swing body is locked by the swing brake device, the top swing body does not swing with respect to the lower traveling body. When the lock of the slewing brake device is released, the upper slewing body can pivot with respect to the lower running body. An example of a conventional swing brake device is shown in FIG. 1 .

Referring to FIG. 1, the conventional swing brake device includes a swing control valve 2 for controlling the flow direction of hydraulic oil discharged from the hydraulic pump 1, and a swing motor driven by the hydraulic oil discharged from the hydraulic pump 1 ( 3), a swing brake cylinder (5) for locking and unlocking the output shaft of the swing motor (3), a swing brake release line (PG) for supplying hydraulic oil to the swing brake cylinder (5), a swing brake release line (PG) A swing brake release valve (4), a swing brake that is provided on the top and operates between a first position for blocking the supply of hydraulic oil from the swing brake release line (PG) to the swing brake cylinder (5) and a second position for releasing the block and an operation signal line (SH) to which pilot hydraulic oil is supplied to change the position of the release valve (4).

The slewing brake device can lock and unlock the upper revolving body under various conditions, and may be typically locked and unlocked by the user's swing operation. If the turning operation is not input by the user, the swing brake release valve 4 maintains the first position shown in FIG. ), it cannot be supplied to the swing brake cylinder 5, and the swing brake cylinder 5 maintains the locked state of the upper swing body.

When the turning operation is input, the hydraulic oil discharged from the main hydraulic pump 1 is supplied to the turning motor 3 through the turning control valve 2 . At the same time, the pilot hydraulic oil is applied to the swing brake release valve 4 through the operation signal line SH, so that the swing brake release valve 4 is switched to the second position, whereby the hydraulic oil in the swing brake release line PG is It is supplied to the rod side chamber of the swing brake cylinder (5). Then, the swing brake cylinder 5 unlocks the upper swing body, and the swing motor 3 is driven by the hydraulic oil to turn the top swing body.

When the turning operation is completed in this state, the pressure of the pilot hydraulic oil applied to the turning brake release valve 4 is lowered, so that the turning brake release valve 4 returns to the first position as shown in FIG. 1, and the turning brake The device locks the upper swivel body again.

As described above, the swing brake device of the conventional construction machine has an operation signal line (SH) for switching the position of the swing brake release valve (4) and a swing brake release line (PG) for supplying hydraulic oil to the swing brake cylinder (5) is provided, since the operation signal line (SH) is supplied with hydraulic oil from a pilot signal line extending from the main control valve (6), the structure of the main control valve (6) is complicated, the size is inevitably increased, and the manufacturing cost is high. there is a problem. In addition, there is a problem that causes hydraulic oil leakage by forming a plurality of flow paths in the main control valve 6 .

KR 10-2009-0131235 A

The present invention is a construction in which the overall configuration of the swing brake device and the main control valve can be simplified by operating the swing brake release valve for unlocking the upper swing body by an electrical signal in order to solve the problems of the prior art described above. An object of the present invention is to provide a turning brake device for a machine.

In order to solve the above problems, the present invention provides a turning brake device for locking and unlocking the turning of the upper revolving body in a construction machine to which the upper revolving body is pivotably coupled to the lower traveling body, wherein hydraulic oil is supplied a slewing brake cylinder for locking the upper revolving body so that the upper revolving body cannot revolve if not, and unlocking the upper revolving body so that the upper revolving body can revolve when hydraulic oil is supplied; a hydraulic pump supplying hydraulic oil to the orbiting brake cylinder; a swing brake release line for supplying hydraulic oil discharged from the hydraulic pump to the swing brake cylinder; The position is determined by an electrical signal between a first position that is provided on the swing brake release line and blocks the supply of hydraulic oil to the swing brake cylinder and a second position that releases the supply of hydraulic oil to the swing brake cylinder. switchable slewing brake release valve; and a control unit configured to output a lock release signal to the swing brake release valve to change the position of the swing brake release valve to the second position when a preset condition is satisfied.

The swing brake release valve may include a manual operation unit for manually changing a position to the second position.

The turning brake device may further include a manipulation unit sensor that detects a turning operation and transmits it to the control unit.

The orbital brake device of the construction machine may further include an orifice part provided between the orbiting brake release valve and the turning brake cylinder on the orbiting brake release line.

The orbiting brake cylinder may include: a cylinder including a head-side chamber and a rod-side chamber to which hydraulic oil is supplied through the orbiting brake release line; a rod drawn out and drawn in from the cylinder; and a spring accommodated in the head-side chamber and pressing in a direction to draw out the rod.

According to an embodiment of the present invention, since the position of the swing brake release valve is switched by an electrical signal, there is no need to provide a hydraulic line for changing the position of the swing brake release valve in the main control valve, so the overall hydraulic line configuration This simplification, miniaturization of the main control valve is possible, and there is an effect of reducing the manufacturing cost.

In addition, according to an embodiment of the present invention, since a manual operation unit is provided in the swing brake release valve, it is possible to manually unlock the upper swing body in an emergency situation.

In addition, according to an embodiment of the present invention, since it is possible to easily set the condition and delay time for unlocking the upper revolving body through software, the efficiency of work by adjusting the unlocking condition and delay time to match the user's work tendency There is an effect that can be improved.

1 is an example of a turning brake device of a construction machine according to the prior art.
2 is an overall configuration diagram of a turning brake device for a construction machine according to an embodiment of the present invention.
3 is a detailed view of a swing brake cylinder of a swing brake device for a construction machine according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

The construction machine to which the slewing brake device according to the present invention is applied, particularly the excavator, is rotatably coupled to the upper revolving body with respect to the lower traveling body. The construction machine may include a swing motor 14 , a first hydraulic pump 12 , and a swing control valve 16 to swing the upper swing body with respect to the lower traveling body.

The turning motor 14 may be driven by the hydraulic oil supplied from the first hydraulic pump 12 to rotate the upper revolving body in one direction or the opposite direction. The upper revolving body may be directly or indirectly coupled to the output shaft of the revolving motor 14 . Whether or not the swing motor 14 is driven and the driving direction may be determined by the swing control valve 16 , and the position of the swing control valve 16 may be switched by a signal generated by a swing operation of the manipulation unit. The turning operation refers to an operation in which the excavator performs a turning operation by a user's corresponding operation through the operation unit. The swing control valve 16 may be a part of the main control valve 18 or may be a separately provided valve.

2 is an overall configuration diagram of a turning brake device for a construction machine according to an embodiment of the present invention, and FIG. 3 is a detailed view of a turning brake cylinder of the turning brake device for a construction machine according to an embodiment of the present invention.

The slewing brake device locks and unlocks the pivoting of the upper slewing body with respect to the undercarriage. When locked by the slewing brake device, the upper slewing body cannot turn, and when the lock is released, the upper slewing body can turn with respect to the lower running body. Hereinafter, when the upper swing body or the swing brake device is locked, it means that the top swing body cannot turn because it is braked by the swing brake device, and unlocking the upper swing body or the swing brake device means braking by the swing brake device This means that the upper revolving body can revolve by being released.

The swing brake device may include a swing brake cylinder 20 , a second hydraulic pump 30 , a swing brake release line 40 , a swing brake release valve 50 , and a control unit 60 .

The swing brake cylinder 20 may lock and unlock the output shaft of the swing motor 14 . Alternatively, when the upper revolving body is not directly connected to the output shaft of the revolving motor 14, the revolving brake cylinder 20 may lock and unlock the rotating shaft of the upper revolving body. The orbiting brake cylinder 20 may include a cylinder 22 , a rod 24 , and a spring 26 . The cylinder 22 may include a head side chamber 27 and a rod side chamber 25 . The rod 24 may be drawn out and drawn in from the cylinder 22 while being inserted into the cylinder 22 . When the rod 24 is withdrawn from the cylinder 22 , the orbiting brake cylinder 20 is extended, and when the rod 24 is inserted into the cylinder 22 , the orbiting brake cylinder 20 is contracted. The head side chamber 27 and the rod side chamber 25 may be partitioned by the rod 24 . A spring 26 may be installed in the head side chamber 27 . The spring 26 urges the rod 24 in a direction in which it is drawn out. The rod side chamber 25 may be connected to the swing brake release line 40 . The upper revolving body can be locked and unlocked by the expansion and contraction operation of the revolving brake cylinder 20. For this, the revolving brake cylinder 20 and the revolving motor 14 may have various coupling structures.

As an example, a plurality of fixed disks may be provided on the output shaft of the turning motor 14 , and a brake disk may be coupled to an end of the rod of the turning brake cylinder 20 . When the fixed disk and the brake disk contact each other, the turning motor 14 may be in a locked state, and when the fixed disk and the brake disk are spaced apart from each other, the turning motor 14 may be in an unlocked state. When the orbiting brake cylinder 20 is elongated, the upper revolving body is locked by contacting the brake disc with the fixed disk, and when the orbiting brake cylinder 20 is contracted, the upper revolving body can be unlocked by separating the brake disc from the fixed disk.

The second hydraulic pump 30 may supply hydraulic oil to the orbiting brake cylinder 20 . The first hydraulic pump 12 and the second hydraulic pump 30 may be various types of pumps, such as a gear pump and a piston pump. The first hydraulic pump 12 and the second hydraulic pump 30 may be separate pumps or the same pump.

The swing brake release line 40 extends between the second hydraulic pump 30 and the swing brake cylinder 20 . The hydraulic oil discharged from the second hydraulic pump 30 may be supplied to the rod-side chamber 25 of the swing brake cylinder 20 through the swing brake release line 40 .

The swing brake release valve 50 is installed between the rod side chamber 25 of the swing brake cylinder 20 and the second hydraulic pump 30 on the swing brake release line 40 . The swing brake release valve 50 blocks and releases the supply of hydraulic oil discharged from the second hydraulic pump 30 to the rod-side chamber of the swing brake cylinder 20 . The swing brake release valve 50 is located between a first position 52 that cuts off the supply of hydraulic oil to the swing brake cylinder 20 and a second position 54 that releases the supply of hydraulic oil to the swing brake cylinder 20 . location is switched. The swing brake release valve 50 may be a solenoid valve that is electrically operated so that the first position 52 and the second position 54 can be switched. The swing brake release valve 50 is electrically connected to the control unit 60 , and a position thereof may be switched by an electrical control signal of the control unit 60 .

When the supply of hydraulic oil to the rod side chamber 25 of the swing brake cylinder 20 is blocked by the swing brake release valve 50, the rod 24 of the swing brake cylinder 20 is withdrawn by the spring 26 and , whereby the fixed disk and the brake disk are brought into contact with each other, so that the upper revolving body is in a locked state. On the other hand, when the supply of hydraulic oil to the rod side chamber 25 of the swing brake cylinder 20 is released by the swing brake release valve 50 , that is, to the rod side chamber 25 of the swing brake cylinder 20 . When the hydraulic oil is supplied, the rod 24 of the orbiting brake cylinder 20 is drawn in by the hydraulic oil, and accordingly, the fixed disk and the brake disk are spaced apart from each other so that the upper swing body can be in an unlocked state.

On the other hand, the swing brake release valve 50 cannot be electrically controlled due to a malfunction of the control unit 60 or a wire disconnection between the control unit 60 and the swing brake release valve 50, and the like. In order to release the swing brake release valve 50, a manual operation unit 56 may be provided. The user may manually change the position of the swing brake release valve 50 by manipulating the manual operation unit 56 in an emergency situation.

The controller 60 may output a control signal to the swing brake release valve 50 to control the position of the swing brake release valve 50 . When it is necessary to unlock the swing brake device, the control unit 60 outputs a lock release signal to the swing brake release valve 50 to switch the swing brake release valve 50 to the second position 54 .

The controller 60 may output a lock release signal when a preset condition is satisfied. First, the control unit 60 may output a lock release signal when a turning operation is input through the operation unit. Since the input of the turning operation is the user's intention to turn the upper swing body, the swing brake device must be unlocked in order to turn the upper swing body. The control unit 60 determines whether a turning operation is input, and when it is determined that the turning operation is input, unlocks the turning brake device. In this case, the determination of whether the turning operation is performed may be performed by various methods. For example, the control unit 60 may detect whether the turning operation is performed by an electrical signal transmitted from the operation unit sensor 70 for detecting the operation of the operation unit. In addition, the control unit 60 may detect whether the turning operation is performed through a signal, pressure, etc. generated by the turning operation. When it is sensed that the turning operation is completed, the control unit 60 switches the turning brake device to the locked state again. In this case, the control unit 60 may lock the turning brake device immediately after the turning operation is completed, or may lock the turning brake device after a preset time after the turning operation is completed.

In addition to the turning operation, the control unit 60 may unlock the turning brake device in response to various manipulations. For example, the control unit 60 may unlock the turning brake device when an operation of the front part such as a boom or an arm is sensed. Even at this time, the control unit 60 may unlock the swing brake device as soon as the boom operation or arm operation is detected, or may unlock the swing brake device after a preset time from when the operation is sensed. The timing at which the orbiting brake device is unlocked, that is, the unlock delay time, can be individually and independently set for each type of operation.

Meanwhile, the turning brake device for a construction machine according to an embodiment of the present invention may further include an orifice part 80 to maintain durability of the turning motor 14 . The orifice part 80 is provided in the middle of the flow path extending from the swing brake release valve 50 to the swing brake cylinder 20 on the swing brake release line 40 . When the swing brake release valve 50 is switched from the first position 52 to the second position 54, hydraulic oil may be suddenly supplied to the swing brake cylinder 20, and the swing brake cylinder 20 suddenly releases the swing brake. When released, the pressure of the turning motor 14 may increase rapidly, and thus durability of the turning motor 14 may be deteriorated. The orifice part 80 reduces the flow rate of the hydraulic oil supplied from the swing brake release valve 50 to the swing brake cylinder 20 to prevent a sudden pressure change in the swing motor 14 from occurring.

Hereinafter, an operation process of the turning brake device of the construction machine according to the present embodiment will be described with reference to the above-described components.

First, the condition for unlocking the upper revolving body and the unlocking delay time are set in the control unit 60 . As described above, the conditions for unlocking the upper revolving body include a turning operation, and in addition, a boom operation, an arm operation, and the like may be further included. In addition, the delay time for unlocking the upper revolving body when the unlocking condition is satisfied may be set differently for each condition, or may be set uniformly for all conditions. For example, when a turning operation is input, the upper swing body is immediately unlocked, and when a boom operation or an arm operation is input, the upper swing body can be unlocked 1 second after the corresponding operation is input.

When the setting of the control unit 60 is completed, the construction machine is driven. At this time, in a situation where the condition for unlocking the upper swing body is not satisfied, the controller 60 does not output the lock release signal to the swing brake release valve 50 . Therefore, the swing brake release valve 50 maintains the first position 52, and accordingly, the hydraulic oil supplied through the swing brake release line 40 is not supplied to the swing brake cylinder 20, so that the upper swing body is lock is maintained.

In a situation that satisfies the condition for unlocking the upper swing body, for example, when a swing operation is input, the control unit 60 outputs a lock release signal to the swing brake release valve 50 . When a lock release signal is input to the swing brake release valve 50, the swing brake release valve 50 is switched from the first position 52 to the second position 54, and accordingly, through the swing brake release line 40 The supplied hydraulic oil is supplied to the rod side chamber 25 of the orbiting brake cylinder 20 . The lock of the upper revolving body is released as the revolving brake cylinder 20 is contracted by the hydraulic oil.

After that, when the condition for unlocking the upper revolving body ends, such as the end of the revolving operation, the control unit 60 ends outputting the unlocking signal, and accordingly, the upper revolving body is in the locked state again.

As described above, in the swing brake device of the construction machine according to the present invention, the swing brake release line 40 does not go through the main control valve, and the operation signal line (SH in FIG. 1) provided in the conventional swing brake device is not required. It has the advantage of simplifying the line configuration and reducing the possibility of hydraulic oil leakage. In addition, since unlocking of the turning brake is electrically controlled by the control unit 60, there is an advantage that the condition and delay time for unlocking the turning brake can be variously set as needed.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes and substitutions will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

12: first hydraulic pump 14: slewing motor
16: swing control valve 20: swing brake cylinder
30: second hydraulic pump 40: slewing brake release line
50: slewing brake release valve 60: control unit
70: control unit sensor 80: orifice unit

Claims (5)

In a construction machine in which an upper revolving body is pivotably coupled to a lower traveling body, as a turning brake device for locking and unlocking the revolving of the upper revolving body,
a slewing brake cylinder for locking the upper revolving body so that it cannot turn when hydraulic oil is not supplied, and releasing the lock so that the upper revolving body can revolve when hydraulic oil is supplied;
a hydraulic pump supplying hydraulic oil to the orbiting brake cylinder;
a swing brake release line for supplying hydraulic oil discharged from the hydraulic pump to the swing brake cylinder;
The position is determined by an electrical signal between a first position that is provided on the swing brake release line and blocks the supply of hydraulic oil to the swing brake cylinder and a second position that releases the supply of hydraulic oil to the swing brake cylinder. switchable slewing brake release valve;
an orifice part 80 provided between the swing brake release valve 50 and the swing brake cylinder 20 on the swing brake release line 40; and
and a control unit configured to output a lock release signal to the swing brake release valve to change the position of the swing brake release valve to the second position when a preset condition is satisfied. According to claim 1,
The swing brake release valve for a construction machine including a manual operation unit for manually changing a position to the second position. According to claim 1,
The slewing brake device is
The turning brake device of a construction machine further comprising a manipulation unit sensor that detects a turning operation and transmits it to the control unit. delete According to claim 1,
The slewing brake cylinder is
a cylinder including a head side chamber and a rod side chamber to which hydraulic oil is supplied through the orbiting brake release line;
a rod drawn out and drawn in from the cylinder; and
Slewing brake device of a construction machine including a spring accommodated in the head-side chamber and pressing in a direction to withdraw the rod.

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