A method of protecting a swing motor of an excavator

Abstract

The application discloses a protection method of a rotary motor of a excavator, comprising the following steps: measuring the included angle between a movable arm and a bucket lever through a movable arm angle sensor and a bucket lever angle sensor, combining the main pump pressure, and dividing the action into empty load pressure holding, empty load adjustment and load digging; when the included angle between the movable arm and the bucket lever is less than the minimum included angle and the main pump pressure is greater than the first pressure, judging that the action is the empty load pressure holding action, starting the rotary brake and making the rotary motor unable to rotate; when the included angle between the movable arm and the bucket lever is greater than the minimum included angle and the main pump pressure is less than the second pressure, judging that the action is the empty load adjustment action, starting the rotary brake and making the rotary motor unable to rotate; and when the included angle between the movable arm and the bucket lever is greater than the minimum included angle and the main pump pressure is greater than the second pressure, judging that the action is the load digging action, and releasing the rotary brake. The method can avoid vehicle sliding and reduce the wear of the rotary motor brake pad when the excavator is used to dig on a slope, thereby ensuring the safety of the digging work and reducing the cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of excavators, and particularly relates to a protection method for a rotary motor of an excavator. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] An excavator mainly comprises a power system, a hydraulic system, an electrical system, a working device, a superstructure system, a substructure system and a covering assembly. Among them, the rotary movement of the excavator is driven by hydraulic pressure, and the elements in the rotary oil circuit are precision elements, such as a safety locking solenoid valve, a pilot control handle, a main valve and a rotary motor.

[0004] For the excavator with a closed rotary hydraulic system, the rotary motor always leaks oil. When the excavator is parked on a slope, if the rotary motor brake pad does not lock, the vehicle will slide, and if it locks, the rotary motor brake pad will be damaged during excavation, and the rotary motor brake pad needs to be replaced frequently, which increases the cost. SUMMARY

[0005] In view of the above problems, the present application provides a protection method for a rotary motor of an excavator, which can avoid vehicle sliding and reduce the wear of the rotary motor brake pad when the excavator is excavating on a slope, thereby ensuring the safety of the excavating work and reducing the cost.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] A protection method for a rotary motor of an excavator, comprising the following steps:

[0008] The angle between the boom and the stick is measured by a boom angle sensor and a stick angle sensor, and combined with the main pump pressure, the action is divided into empty load pressure holding, empty load adjustment and load excavation;

[0009] When the angle between the boom and the stick is equal to the minimum angle, and the main pump pressure is greater than the first pressure, it is judged that the action is in the empty load pressure holding, the rotary brake is started, and the rotary motor cannot rotate;

[0010] When the angle between the boom and the stick is greater than the minimum angle, and the main pump pressure is less than the second pressure, it is judged that the action is in the empty load adjustment, the rotary brake is started, and the rotary motor cannot rotate;

[0011] When the angle between the boom and the stick is greater than the minimum angle, and the main pump pressure is greater than the second pressure, it is judged that the action is in the load excavation, the rotary brake is released, and the rotary motor can rotate.

[0012] Further, the swing arm angle sensor is installed on the swing arm of the excavator, and the arm angle sensor is installed on the arm of the excavator.

[0013] Further, the angle between the swing arm and the arm is measured by the swing arm angle sensor and the arm angle sensor, and a signal of the angle is transmitted to the controller.

[0014] Further, a pressure sensor is installed on the main pump, the pressure of the main pump is measured by the pressure sensor, and a main pump pressure signal of the main pump is transmitted to the controller.

[0015] Further, the controller determines an action as no-load pressure holding, no-load adjustment or load digging according to the angle signal transmitted by the swing arm angle sensor and the arm angle sensor and the main pump pressure signal transmitted by the pressure sensor, and then starts or releases the swing brake.

[0016] Further, the controller is electrically connected with the arm angle sensor, the swing arm angle sensor and the pressure sensor.

[0017] Further, the minimum angle is the minimum angle between the swing arm and the arm.

[0018] Further, the first pressure is 30Mpa, the main pump pressure is greater than 30Mpa, the angle between the swing arm and the arm is equal to the minimum angle, and it is determined that the no-load pressure holding warm-up is performed at this time.

[0019] Further, the second pressure is 10Mpa, the main pump pressure is less than 10Mpa, the angle between the swing arm and the arm is greater than the minimum angle, and it is determined that the position of the excavating device is adjusted at this time.

[0020] Further, the main pump pressure is greater than 10Mpa, the angle between the swing arm and the arm is greater than the minimum angle, and it is determined that the load digging is performed at this time.

[0021] Compared with the prior art, the present application has the advantages and positive effects that:

[0022] The present application measures the included angle between the arm and the bucket through the arm angle sensor and the boom angle sensor, measures the main pump pressure through the pressure sensor, transmits the included angle of the arm and the bucket and the main pump pressure to the controller, the controller judges the action as empty load pressure holding, empty load adjustment or load digging according to the included angle signal transmitted by the arm angle sensor and the boom angle sensor and the main pump pressure signal transmitted by the pressure sensor, and then enables the rotation brake to start or release, so that the rotation motor can rotate or not according to the working action of the excavator, that is, the rotation motor is judged to be in the working state required by the excavator in different actions, and then when the excavator is in the slope for digging work, the wear of the rotation motor brake pad is reduced while the vehicle sliding is avoided, the safety of the digging work is ensured, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application, and do not constitute an improper limitation of the application.

[0024] Figure 1 is a flow chart of the anti-slip and motor protection method of the excavator of the present application;

[0025] Figure 2 is a structural diagram of the arm and the bucket;

[0026] In the figure: 1, arm; 2, bucket; 3, included angle. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs.

[0028] The present application will be described in detail below with reference to the accompanying drawings. The disclosed protection method of the rotation motor of the excavator includes the following steps as shown in Figure 1 .

[0029] The included angle between the arm 1 and the bucket 2 is measured through the arm angle sensor and the bucket angle sensor, and the action is divided into empty load pressure holding, empty load adjustment and load digging in combination with the main pump pressure;

[0030] When the included angle between the arm 1 and the bucket 2 is equal to the minimum included angle and the main pump pressure is greater than the first pressure, it is judged that the action at this time is empty load pressure holding, the rotation brake is started, and the rotation motor cannot rotate;

[0031] When the included angle between the arm 1 and the bucket 2 is greater than the minimum included angle and the main pump pressure is less than the second pressure, it is judged that the action at this time is empty load adjustment, the rotation brake is started, and the rotation motor cannot rotate;

[0032] When the angle between the boom 1 and the dipper arm 2 is greater than the minimum angle, and the main pump pressure is greater than the second pressure, it is determined that the excavating action is under load, the swing brake is released, and the swing motor can rotate.

[0033] In the no-load pressure holding and no-load adjustment actions, the swing brake is started, at this time, the swing motor cannot rotate, and further, the swing motor brake pad is prevented from being additionally subjected to the swing force generated by the excavating, when the excavating action is under load, the swing brake is released, and at this time, the swing motor can rotate.

[0034] The no-load pressure holding refers to that the excavator has no material to be excavated, the working device reaches the end of the stroke, and the hydraulic system pressure reaches the maximum. The no-load adjustment refers to that the excavator has no material load in the dipper, and the purpose of the action of the working device is to adjust the posture of the excavator. The excavating under load refers to that the excavator has material in the dipper, and the working device is continuously excavating.

[0035] In the no-load pressure holding and the no-load adjustment, the swing brake is in the braking state (the brake pad of the swing motor is locked), because at this time, there is no external swing torque applied to the swing plane. In the excavating under load, the swing brake is in the released state (the brake pad of the swing motor is unlocked), because when excavating, the external load will generate the swing torque on the swing plane of the excavator, at this time, the brake is released, and the brake pad of the swing motor is unlocked, which can effectively reduce the wear of the brake pad.

[0036] The angle 3 between the dipper arm 2 and the boom 1 is measured by the dipper arm angle sensor and the boom angle sensor, and the main pump pressure is measured by the pressure sensor. The angle 3 between the dipper arm and the boom and the main pump pressure are transmitted to the controller. The controller determines the action to be the no-load pressure holding, the no-load adjustment or the excavating under load according to the angle signal transmitted by the dipper arm angle sensor and the boom angle sensor and the main pump pressure signal transmitted by the pressure sensor, and further makes the swing brake start or release, so that the swing motor can rotate or not according to the working action of the excavator. That is, the working state of the swing motor required by the excavator in different actions is determined, and further, when the excavator is excavating on a slope, the wear of the brake pad of the swing motor is reduced while the vehicle is prevented from sliding, the safety of the excavating work is ensured, and the actual working cost is reduced.

[0037] The boom angle sensor is installed on the boom 1 of the excavator, and the dipper arm angle sensor is installed on the dipper arm 2 of the excavator. The angle 3 between the boom 1 and the dipper arm 2 is measured by the boom angle sensor and the dipper arm angle sensor, and the signal of the angle 3 is transmitted to the controller. The pressure sensor is installed on the main pump, the pressure of the main pump is measured by the pressure sensor, and the main pump pressure signal of the main pump is transmitted to the controller. The controller is electrically connected with the dipper arm angle sensor, the boom angle sensor and the pressure sensor.

[0038] The controller can be a PLC controller, which uses programmable memory to store operation instructions for performing logic operation, sequence control, timing, counting and arithmetic operation, and controls various types of machines or production processes through digital and analog input and output.

[0039] The controller determines the action as empty load pressure holding, empty load adjustment or load digging according to the included angle signals transmitted by the boom angle sensor and the stick angle sensor and the main pump pressure signal transmitted by the pressure sensor, and then starts or releases the slewing brake.

[0040] As shown in Figure 2 The minimum included angle is the minimum included angle between the boom and the stick. The boom 1 and the stick 2 are rotatably connected through corresponding structures, and the stick can rotate around the center point of the connection position. The connection position of the boom 1 and the stick 2 has an included angle, and when the stick rotates inward to the limit position, the included angle at this time is the minimum included angle.

[0041] The first pressure is 30 Mpa, the main pump pressure is greater than 30 Mpa, and the included angle between the boom and the stick is equal to the minimum included angle, which is determined to be through pressure holding warm-up and in the empty load pressure holding action. The second pressure is 10 Mpa, the main pump pressure is less than 10 Mpa, and the included angle between the boom and the stick is greater than the minimum included angle, which is determined to be adjusting the position of the digging working device and in the empty load adjustment action. The main pump pressure is greater than 10 Mpa, and the included angle between the boom and the stick is greater than the minimum included angle, which is determined to be in the digging operation and in the load digging action. The slewing brake is started or released according to the working state of the excavator. The set values of the first pressure and the second pressure need to be set according to the specific model of the excavator, and the angle of the minimum included angle also needs to be obtained according to the model of the excavator.

[0042] Although the specific embodiments of the present application have been described above with reference to the drawings, it is not a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art without creative labor on the basis of the technical solutions of the present application are still within the scope of protection of the present application.

Claims

1. A method of protecting a swing motor of a shovel, characterized by, The method comprises the following steps: An angle between the boom and the stick is measured by a boom angle sensor and a stick angle sensor, and a main pump pressure is combined to divide the action into empty load pressure holding, empty load adjustment, and load digging; When the angle between the boom and the stick is equal to a minimum angle and the main pump pressure is greater than a first pressure, it is judged that the action is in the empty load pressure holding, the rotation brake is started, and the rotation motor cannot rotate; When the angle between the boom and the stick is greater than the minimum angle and the main pump pressure is less than a second pressure, it is judged that the action is in the empty load adjustment, the rotation brake is started, and the rotation motor cannot rotate; When the angle between the boom and the stick is greater than the minimum angle and the main pump pressure is greater than the second pressure, it is judged that the action is in the load digging, the rotation brake is released, and the rotation motor can rotate; The first pressure is 30 Mpa, the main pump pressure is greater than 30 Mpa, the angle between the boom and the stick is equal to the minimum angle, and it is judged that the action is in the empty load pressure holding.

2. A method of protecting a swing motor of an excavator as claimed in claim 1, characterized in that, The boom angle sensor is installed on the boom of the excavator, and the stick angle sensor is installed on the stick of the excavator.

3. A method of protecting a swing motor of an excavator as claimed in claim 2, wherein, The angle between the boom and the stick measured by the boom angle sensor and the stick angle sensor is transmitted to a controller as an angle signal.

4. A method of protecting a swing motor of an excavator as claimed in claim 3, wherein, A pressure sensor is installed on the main pump to measure the pressure of the main pump, and a main pump pressure signal of the main pump is transmitted to the controller.

5. A method of protecting a swing motor of an excavator as defined in claim 4, characterized in that, The controller judges the action to be the empty load pressure holding, the empty load adjustment, or the load digging according to the angle signal transmitted by the boom angle sensor and the stick angle sensor and the main pump pressure signal transmitted by the pressure sensor, and then starts or releases the rotation brake.

6. A method of protecting a swing motor of an excavator as defined in claim 5, characterized in that, The controller is electrically connected with the stick angle sensor, the boom angle sensor, and the pressure sensor.

7. The method of protecting a swing motor of a power shovel according to claim 1, wherein The minimum angle is the minimum angle between the boom and the stick.

8. The method of protecting a swing motor of a power shovel according to claim 1, wherein The second pressure is 10 Mpa, the main pump pressure is less than 10 Mpa, the angle between the boom and the stick is greater than the minimum angle, and it is judged that the action is in the adjustment of the position of the digging working device.

9. The method of protecting a swing motor of a power shovel according to claim 1, wherein The main pump pressure is greater than 10 Mpa, the angle between the boom and the stick is greater than the minimum angle, and it is judged that the action is in the load digging.

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