JPH0519401Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a device for swinging and stopping the upper revolving body of an upper revolving vehicle.

2. Description of the Related Art A device is known in which a swing operation member switches a swing valve to control the supply of pressure oil to a swing motor to stop the upper structure from swinging.

Problems to be Solved by the Invention Since the swivel valve is manually switched by the operator, the amount of oil supplied to the swivel motor from the swivel valve is determined by the stroke of the switching spool. Since the force is determined by the stroke of the swing operation member, a shock occurs when the swinging upper body completes the rotation stop, which is undesirable because it may damage the upper swinging body or various parts of the swing mechanism.

For example, the relationship between the stroke of the swing operating member and the swing braking force is as shown in Figure 3. When the swing operating member is operated from the full stroke position to the neutral position, the swing braking force increases sequentially until it reaches the neutral position. Since the maximum value is reached slightly before the turn, a shock occurs when the turning stop is completed.

In other words, when the swing operation member is operated from the neutral position to the full position, the amount of oil supplied from the swing valve to the swing motor increases sequentially, and when the swing operation member is operated from the full position to the neutral position, the amount of oil is supplied from the swing valve to the swing motor. At the same time, the flow of return oil from the swing motor to the drain is sequentially restricted by the swing valve, pressure is generated on the return side, and the swing braking force increases sequentially, causing the swing valve to return to the neutral position. Then, high pressure is generated on the return side due to the inertia of the upper rotating body, resulting in a shock.

Means and action for solving the problem Switching is possible between a state in which pressure oil discharged from the pump 16 is supplied to the swing motor 4 that swings the upper swing structure 3, a state in which the pressure oil supply is stopped, and a state in which the swing brake force is reduced. A swing valve 15, a swing operating member 10 that outputs a manipulation signal _R1 when operated from the neutral position N, a control section 13 that outputs a switching signal to the swing valve ₁₅ in response to the manipulation signal R1, and an upper rotating structure. A turning speed detecting means for detecting the turning speed of No. 3 and inputting the detected turning speed to the control section 13 is provided.
In this case, the turning operation member 10 is in the neutral position N and the operation signal is
When _R1 is not input, a signal is output that causes the swing valve 15 to stop supplying pressure oil, and the swing operation member 10 is operated from the neutral position N to output the operation signal.
When R ₁ is input, a signal is output that puts the swing valve 15 into a state of supplying pressure oil, and furthermore, when the swing speed input from the swing speed detection means changes from high speed to a value slightly larger than zero, it outputs a signal for a certain period of time. A swing stop device for an upper swing type vehicle configured to output a signal for reducing the swing brake force of a swing valve 15.

As a result, when the swing operation member 10 is operated from the operation position to the neutral position to stop the swing upper structure 3, when the swing speed of the swing upper structure 3 changes from high speed to a value slightly larger than zero, the swing valve 15 is activated. Since the swing brake force is reduced for a certain period of time, the swing brake force is weakened for a certain period of time immediately before the upper revolving structure 3 stops, and the upper revolving structure 3 can be stopped swinging without a shock.

Example An upper swing type vehicle A has a swing mechanism 2 on a lower traveling body 1.
The upper revolving body 3 is attached to the upper revolving body 3 through the upper revolving body 3, and the swing mechanism 2 is equipped with a swing motor 4, and a working machine 5 is attached to the upper revolving body 3. An angle sensor 6 is attached.

A potentiometer 11 is provided at the base of the swing operation member 10 to move the swing operation member 10 to a neutral position N.
When operated toward the full position F, an operation signal R ₁ proportional to the operation stroke is output, and the operation signal R ₁ is input to the control unit 13 via the AD converter 12; Operation signal R ₁
The rotation signal R ₂ is outputted to the rotation valve ₁ via the DA converter 14.
5 as a switching signal, and the swing valve 15 is switched in accordance with the input switching signal to control the amount of oil supplied from the pump 16 to the swing motor 4.

The turning angle θ of the turning angle sensor 6 is sent to a differentiator 17 and becomes a turning speed V, and the turning angle V is inputted to the control section 13.

When the swing operation member 10 is operated from the neutral position N to the full position F, an operation signal R ₁ proportional to the operation stroke is input to the control section 13, and the magnitude of the operation signal R ₁ is input from the control section 13. A rotation signal R ₂ proportional to the rotation signal R 2 is input to the rotation valve 14, and the rotation valve 14 switches in proportion to the rotation signal R ₂ , and the pressure oil discharged from the pump 16 is supplied to the rotation motor 4, and the oil amount is Swing operation member 10
Since it is proportional to the operating stroke of the swing motor 4
rotates at a speed proportional to the operating stroke, and the upper rotating body 3 swings from the neutral position N to the full position F of the swing operating member 10 at a swing speed proportional to the operating stroke.

In addition, in order to stop the upper rotating body 3, the swing operation member 10 is operated to the neutral position N, and the operation signal R ₁ is activated.
will not be output. As a result, the control unit 13 no longer outputs the swing signal R ₂ and the swing valve 15 switches to the neutral state, so pressure oil is not supplied to the swing motor 4 from the pump 16 and the swing motor 4 stops. The turning braking force is the same as before.

For this reason, the revolving upper structure 3 is sequentially decelerated and finally stops rotating, but the rotation speed of the revolving upper structure 3 is V
When becomes a value slightly larger than zero, that is, slightly before the upper revolving body 3 stops rotating, the control unit 13
When the swing speed V is input, a signal is output for a certain period of time to switch the swing valve 15 to a state where the swing brake force is reduced, for example, to a state where the swing motor 4 freely rotates due to an external force, As shown in Figure 2, it is weakened by a certain period of time _t1 ,
Then, the turning brake force is maximized again.

In this way, regardless of the operating stroke of the swing operating member 10, the swing brake force is automatically weakened for a certain period of time just before the swinging upper structure 3 stops swinging, so that the swinging upper structure 3 can be stopped without a shock.

Effects of the invention When the swing operation member 10 is operated from the operation position to the neutral position to stop the upper structure 3 from rotating, when the rotation speed of the upper structure 3 changes from high speed to a value slightly larger than zero, the rotation valve 15 is activated. Since the swing brake force is reduced for a certain period of time, the swing brake force is weakened for a certain period of time immediately before the upper revolving structure 3 stops, and the upper revolving structure 3 can be stopped swinging without a shock.

In addition, since the swing valve 15 is brought into a state where the swing brake force is reduced depending on the swing speed change of the upper revolving structure 3, the swing brake force can be accurately weakened for a certain period of time without malfunction immediately before the upper revolving structure 3 stops rotating. This allows the upper revolving structure to be reliably stopped without a shock.

In addition, since the swing brake force is weakened by the swing valve 15, it is not affected by dirt or the like in the oil.

[Brief explanation of the drawing]

FIG. 1 is a diagrammatic configuration explanatory diagram showing an embodiment of the present invention, FIG. 2 is a table diagram showing changes in turning braking force,
FIG. 3 is a table showing the relationship between the conventional swing brake force and the operation stroke of the swing operation member. 1 is a lower traveling body, 2 is a rotating mechanism, and 3 is an upper rotating body.

Claims (1)

[Claims for Utility Model Registration] In an upper swing type vehicle in which an upper swing structure 3 is attached to a lower traveling structure 1 so as to be able to swing by a swing mechanism 2 having a swing motor 4, the pressure oil discharged from a pump 16 is supplied to the swing motor 4. A swing valve 15 that can be switched between a state where pressure oil is supplied, a state where pressure oil supply is stopped, and a state where the swing brake force is reduced, and an operation signal that can be changed by operating from the neutral position N.
A swing operation member 10 that outputs _R1 , a control section 13 that outputs a switching signal to the swing valve ₁₅ based on this operation signal R1, and a control section 13 that detects the swing speed of the upper rotating structure 3 and inputs it to the control section 13. A swing speed detection means is provided, and the control unit 13 outputs a signal that causes the swing valve 15 to stop supplying pressure oil when the swing operation member 10 is at the neutral position N and the operation signal _R1 is not input, and the control unit 13 outputs a signal to stop supplying pressure oil to the swing valve 15, and performs the swing operation. When the member 10 is operated from the neutral position N and the operation signal R ₁ is input, a signal is output that causes the swing valve 15 to be in a state of supplying pressure oil, and furthermore, the swing speed input from the swing speed detection means is changed from high to high speed. A swing stop device for an upper swing type vehicle, characterized in that the swing stop device for an upper swing type vehicle is configured to output a signal that causes a swing valve 15 to reduce the swing brake force for a certain period of time when the value changes to a value slightly larger than zero.