Excavator engine damping system with active variable rigidity

Abstract

The invention discloses an active variable-rigidity excavator engine damping system which comprises a power assembly, a rubber hydraulic shock absorber, an electromagnetic valve set, an energy accumulator, a movable arm oil cylinder, a hydraulic oil tank and a control system, the power assembly is installed on the rubber hydraulic shock absorber through a four-point overhanging support, and the movable arm oil cylinder is communicated with a first port of the electromagnetic valve set; the energy accumulator is communicated with a second port and a fourth port of the electromagnetic valve set, the hydraulic oil tank is communicated with a sixth port of the electromagnetic valve set, and the rubber hydraulic shock absorber is communicated with a third port and a fifth port of the electromagnetic valve set. The rubber hydraulic shock absorbers are adopted for shock absorption of the power assembly, and the equivalent stiffness of the rubber hydraulic shock absorbers is adjusted by adjusting the pressure of hydraulic oil in the rubber hydraulic shock absorbers, so that the equivalent stiffness of the rubber hydraulic shock absorbers is matched with the current working condition of the excavator; therefore, a good damping effect can be provided under different working conditions of the excavator.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engine damping, and particularly relates to an active variable stiffness excavator engine damping system. BACKGROUND

[0002] The excavator will be subjected to a large vibration during the working process, especially when working under heavy load or fast driving, the vibration of the engine and the hydraulic system may affect the stability of the machine and the comfort of the operator.

[0003] As shown in Figure 1 The existing excavator engine damping system includes an engine 100, a connecting flange 200, a hydraulic pump 300 and a rubber damping pad 400. The connecting flange 200 is fixedly connected to the engine 100, the hydraulic pump 300 is fixedly installed on the connecting flange 200, and the rubber damping pad 400 is installed on the engine 100. According to the center of gravity position relationship of the power assembly including the engine 100, the connecting flange 200 and the hydraulic pump 300, the overall weight of the power assembly, the average impact of the power assembly during the construction operation, the engine 100 rotating speed and other parameters, the rubber damping pad 400 with appropriate stiffness is installed on the power assembly, thereby playing a role in reducing the system vibration. The rubber damping pad 400 with fixed stiffness matched by the method has different shock isolation effects under different rotating speeds and different working conditions of the excavator, and cannot guarantee to provide good damping effect under different working conditions. Moreover, with the passage of time, the rubber material will age, resulting in a decrease in the damping effect of the rubber damping pad 400, and further reducing the driving comfort of the excavator driver and the impact resistance reliability of the excavator parts. At present, only the aging use condition of the rubber damping pad 400 can be judged by the excavator driver according to the driving experience as the basis for replacing the rubber damping pad 400. This method is too dependent on personnel experience, and misjudgment may occur. SUMMARY

[0004] To solve the above-mentioned technical problems in the prior art, the present application provides an active variable stiffness excavator engine damping system, which comprises a power assembly, a rubber hydraulic damper, an electromagnetic valve group, an accumulator, a boom cylinder, a hydraulic oil tank and a control system. The power assembly is installed on the rubber hydraulic damper through a four-point suspension support. The boom cylinder is in communication with a first port of the electromagnetic valve group. The accumulator is in communication with a second port and a fourth port of the electromagnetic valve group. The hydraulic oil tank is in communication with a sixth port of the electromagnetic valve group. The rubber hydraulic damper is in communication with a third port and a fifth port of the electromagnetic valve group.

[0005] Further, the active variable stiffness excavator engine damping system further comprises a sensor group, which comprises

[0006] a first pressure sensor arranged on the accumulator and configured to detect the real-time internal pressure of the accumulator;

[0007] a second pressure sensor arranged on the rubber hydraulic damper and configured to detect the actual working pressure of the rubber hydraulic damper;

[0008] a rotation speed sensor arranged on the power assembly and configured to detect the actual rotation speed of the engine in the power assembly;

[0009] a vibration sensor arranged on the power assembly and configured to detect the vibration signal of the power assembly.

[0010] Further, in the excavator engine damping system with active variable stiffness, the control system comprises a controller, and a first pressure regulating module and a second pressure regulating module integrated in the controller, and the controller is electrically connected with the electromagnetic valve group, wherein:

[0011] The first pressure regulating module is configured to determine whether the real-time internal pressure of the accumulator is within the set pressure range according to the actual detection pressure value of the first pressure sensor, and if the real-time internal pressure of the accumulator is lower than the set pressure range, the controller controls the on-off state of the electromagnetic valve group to change, so that the hydraulic oil in the hydraulic oil tank is input into the accumulator through the electromagnetic valve group, so that the pressure in the accumulator is kept within the set pressure range; if the real-time internal pressure of the accumulator is higher than the set pressure range, the controller controls the on-off state of the electromagnetic valve group to change, so that the hydraulic oil in the accumulator is returned to the hydraulic oil tank through the electromagnetic valve group, so that the pressure in the accumulator is kept within the set pressure range;

[0012] The second pressure regulating module is configured to regulate the working pressure of the rubber hydraulic damper, and the second pressure regulating module comprises:

[0013] a target pressure determining unit configured to determine the target pressure set value of the rubber hydraulic damper according to the real-time detection data of the rotation speed sensor and the vibration sensor;

[0014] The pressure regulating unit is used for regulating the pressure of the rubber hydraulic shock absorber by the accumulator until the actual working pressure of the rubber hydraulic shock absorber reaches the target pressure setting value; when the actual working pressure of the rubber hydraulic shock absorber is lower than the target pressure setting value, the controller controls the on-off state of the electromagnetic valve group to change, and the hydraulic oil is input from the accumulator to the rubber hydraulic shock absorber through the electromagnetic valve group; when the actual working pressure of the rubber hydraulic shock absorber is higher than the target pressure setting value, the controller controls the on-off state of the electromagnetic valve group to change, and the hydraulic oil in the rubber hydraulic shock absorber flows back to the hydraulic oil tank through the electromagnetic valve group.

[0015] The active variable stiffness excavator engine damping system has the following advantages and beneficial effects:

[0016] (1) The rubber hydraulic shock absorber is used for damping the power assembly, and based on the detection data of the rotation speed sensor, the vibration sensor 10 and the second pressure sensor 9, the pressure of the hydraulic oil in the rubber hydraulic shock absorber is adjusted, so as to adjust the equivalent stiffness of the rubber hydraulic shock absorber, so that the equivalent stiffness of the rubber hydraulic shock absorber matches the current working condition of the excavator, thereby providing good damping effect under different working conditions of the excavator.

[0017] (2) The potential energy of the swing arm descending is recycled through the setting of the accumulator, and the oil return pressure recycled from the swing arm cylinder is used for pressure regulation of the rubber hydraulic shock absorber, thereby improving the energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only used to further understand the embodiments of the present application and form a part of the present application. For those skilled in the art, other drawings can also be obtained without creative labor based on these drawings. In the drawings:

[0019] Figure 1 is a structural schematic diagram of the engine damping system of the prior art;

[0020] Figure 2 is a structural schematic diagram of the active variable stiffness excavator engine damping system of the present application;

[0021] Figure 3 is a structural schematic diagram of the electromagnetic valve group in the active variable stiffness excavator engine damping system of the present application.

[0022] Explanation of reference signs:

[0023] 1, power assembly; 2, rubber hydraulic shock absorber; 3, controller; 4, electromagnetic valve group; 401, first port; 402, second port; 403, third port; 404, fourth port; 405, fifth port; 406, sixth port; 5, accumulator; 6, boom cylinder; 7, hydraulic oil tank; 8, first pressure sensor; 9, second pressure sensor; 10, vibration sensor; 100, engine; 200, connecting flange; 300, hydraulic pump; 400, rubber shock pad. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] As shown in Figure 2 and Figure 3 The active variable stiffness excavator engine damping system provided by the present application comprises a power assembly 1, a rubber hydraulic shock absorber 2, a controller 3, an electromagnetic valve group 4, an accumulator 5, a boom cylinder 6 and a hydraulic oil tank 7. The power assembly 1 is installed on the rubber hydraulic shock absorber 2 through a four-point suspension support. The boom cylinder 6 is in communication with the first port 401 of the electromagnetic valve group 4. The accumulator 5 is in communication with the second port 402 and the fourth port 404 of the electromagnetic valve group 4. The hydraulic oil tank 7 is in communication with the sixth port 406 of the electromagnetic valve group 4. The rubber hydraulic shock absorber 2 is in communication with the third port 403 and the fifth port 405 of the electromagnetic valve group 4. The controller 3 is electrically connected with the electromagnetic valve group 4.

[0026] Further, the active variable stiffness excavator engine damping system of the present application further comprises a sensor group, which comprises:

[0027] A first pressure sensor 8 is arranged on the accumulator 5 and is used to detect the real-time pressure inside the accumulator 5.

[0028] A second pressure sensor 9 is arranged on the rubber hydraulic shock absorber 2 and is used to detect the actual working pressure of the rubber hydraulic shock absorber 2.

[0029] A rotational speed sensor is arranged on the power assembly 1 and is used to detect the actual rotational speed of the engine in the power assembly 1.

[0030] A vibration sensor 10 is arranged on the power assembly 1 and is used to detect the vibration signal of the power assembly 1.

[0031] The working principle and process of the active variable stiffness excavator engine damping system of the present application are briefly described as follows:

[0032] (1) When the boom of the excavator is lowered, the potential energy generated in the boom cylinder 6 during the lowering process of the excavator boom will press the hydraulic oil in the boom cylinder 6 into the electromagnetic valve group 4 through the first port 401 and further flow into the accumulator 5 through the second port 402, thereby recovering the oil return of the boom cylinder 6 and realizing the recovery and reuse of the potential energy of the boom lowering.

[0033] (2) The first pressure sensor 8 monitors the pressure inside the accumulator 5 in real time. When the pressure inside the accumulator 5 is lower than the set pressure range, the controller 3 changes the on-off state of the electromagnetic valve group 4 according to the actual detection pressure value input from the first pressure sensor 8, and flows the hydraulic oil into the accumulator 5 through the electromagnetic valve group 4 through the hydraulic oil tank 7, so that the pressure inside the accumulator 5 is kept within the set pressure range; when the pressure inside the accumulator 5 is higher than the set pressure range, the controller 3 changes the on-off state of the electromagnetic valve group 4 according to the actual detection pressure value input from the first pressure sensor 8, and flows the hydraulic oil in the accumulator 5 back to the hydraulic oil tank 7 through the electromagnetic valve group 4, so that the pressure inside the accumulator 5 is kept within the set pressure range.

[0034] (3) According to the detection data of the speed sensor, the vibration sensor 10 and the second pressure sensor 9, the target working pressure of the rubber hydraulic damper 2 is adjusted in real time: when the actual working pressure of the rubber hydraulic damper 2 is lower than the target working pressure of the rubber hydraulic damper 2, the controller 3 changes the on-off state of the electromagnetic valve group 4, and the hydraulic oil is pressed from the accumulator 5 into the electromagnetic valve group 4 through the fourth port 404 and further input into the rubber hydraulic damper 2 through the third port 403 and the fifth port 405, so as to adjust the actual working pressure of the rubber hydraulic damper 2 to the target working pressure, so that the equivalent stiffness of the rubber hydraulic damper 2 matches the current working condition of the excavator; when the actual working pressure of the rubber hydraulic damper 2 is higher than the target working pressure of the rubber hydraulic damper 2, the controller 3 changes the on-off state of the electromagnetic valve group 4, and the hydraulic oil in the rubber hydraulic damper 2 flows back to the hydraulic oil tank 7 through the electromagnetic valve group 4, so as to adjust the actual working pressure of the rubber hydraulic damper 2 to the target working pressure, so that the equivalent stiffness of the rubber hydraulic damper 2 matches the current working condition of the excavator.

[0035] Therefore, in the active variable stiffness excavator engine damping system, the potential energy of the boom lowering is recovered by the accumulator 5, and the oil return pressure recovered from the boom cylinder is used for pressure adjustment of the rubber hydraulic damper 2, thereby improving energy utilization; the power assembly 1 is damped by the rubber hydraulic damper 2, and based on the real-time detection data of the speed sensor, the vibration sensor 10 and the second pressure sensor 9, the pressure of the hydraulic oil in the rubber hydraulic damper 2 is adjusted, so that the equivalent stiffness of the rubber hydraulic damper 2 is adjusted, so that the equivalent stiffness of the rubber hydraulic damper 2 matches the current working condition of the excavator, and good damping effect is ensured under different working conditions of the excavator.

[0036] Further, the active variable stiffness excavator engine damping system further comprises a control system, which comprises the controller 3 and a first pressure regulating module and a second pressure regulating module integrated in the controller 3.

[0037] The first pressure regulating module is used to judge whether the internal real-time pressure of the accumulator 5 is in the set pressure range, if the internal real-time pressure of the accumulator 5 is lower than the set pressure range, the controller 3 controls the on-off state of the electromagnetic valve group 4 to change according to the actual detection pressure value input from the first pressure sensor 8, so that the hydraulic oil flows into the accumulator 5 through the electromagnetic valve group 4 through the hydraulic oil tank 7, so that the pressure in the accumulator 5 is kept in the set pressure range; if the internal real-time pressure of the accumulator 5 is higher than the set pressure range, the controller 3 controls the on-off state of the electromagnetic valve group 4 to change according to the actual detection pressure value input from the first pressure sensor 8, so that the hydraulic oil in the accumulator 5 flows back to the hydraulic oil tank 7 through the electromagnetic valve group 4, so that the pressure in the accumulator 5 is kept in the set pressure range;

[0038] The second pressure regulating module is used to regulate the working pressure of the rubber hydraulic damper 2, and the second pressure regulating module comprises:

[0039] A target pressure determination unit is configured to determine a target pressure set value of the rubber hydraulic damper 2 according to the real-time detection data of the speed sensor and the vibration sensor 10.

[0040] The pressure regulating unit is used for pressure regulating the rubber hydraulic shock absorber 2 by the energy accumulator 5 until the actual working pressure of the rubber hydraulic shock absorber 2 reaches the target pressure setting value; when the actual working pressure of the rubber hydraulic shock absorber 2 is lower than the target pressure setting value of the rubber hydraulic shock absorber 2, the controller 3 controls the on-off state of the electromagnetic valve group 4 to change, and the hydraulic oil is input from the energy accumulator 5 to the rubber hydraulic shock absorber 2 through the electromagnetic valve group 4, so as to regulate the actual working pressure of the rubber hydraulic shock absorber 2 to the target pressure setting value; when the actual working pressure of the rubber hydraulic shock absorber 2 is higher than the target pressure setting value of the rubber hydraulic shock absorber 2, the controller 3 controls the on-off state of the electromagnetic valve group 4 to change, and the hydraulic oil in the rubber hydraulic shock absorber 2 flows back to the hydraulic oil tank 7 through the electromagnetic valve group 4, so as to regulate the actual working pressure of the rubber hydraulic shock absorber 2 to the target pressure setting value.

[0041] It should be noted that, in this article, unless otherwise specified and limited, the term "connection" or its synonyms should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship between two elements, and those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific situation. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. At the same time, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, "front", "back", "left", "right", "up", "down" in this article are referred to the placement state shown in the drawings.

[0042] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An active variable stiffness excavator engine damping system, characterized in that: include: A powertrain, a rubber hydraulic shock absorber, a solenoid valve group, an accumulator, a boom cylinder, a hydraulic oil tank and a control system. The powertrain is installed on the rubber hydraulic shock absorber through a four-point suspension bracket. The boom cylinder is connected to the first port of the solenoid valve group, the accumulator is connected to the second and fourth ports of the solenoid valve group, the hydraulic oil tank is connected to the sixth port of the solenoid valve group, and the rubber hydraulic shock absorber is connected to the third and fifth ports of the solenoid valve group.

2. The active variable stiffness excavator engine damping system according to claim 1, characterized in that: Also included is a sensor group, the sensor group comprising: a first pressure sensor, provided on the accumulator, for detecting the real-time internal pressure of the accumulator; a second pressure sensor, provided on the rubber hydraulic shock absorber, for detecting an actual working pressure of the rubber hydraulic shock absorber; a speed sensor, provided on the power assembly, for detecting the actual speed of the engine in the power assembly; The vibration sensor is arranged on the power assembly and is used to detect the vibration signal of the power assembly.

3. The active variable stiffness excavator engine damping system according to claim 2, characterized in that: The control system includes a controller, and a first pressure regulating module and a second pressure regulating module integrated in the controller, wherein the controller is electrically connected to the solenoid valve group, wherein: The first pressure regulating module is configured to determine whether the real-time internal pressure of the accumulator is within a set pressure range based on the actual detected pressure value of the first pressure sensor. If the real-time internal pressure of the accumulator is lower than the set pressure range, the controller controls the on-off state of the solenoid valve group to change, so that the hydraulic oil in the hydraulic oil tank is input into the accumulator through the solenoid valve group, so that the pressure in the accumulator is maintained within the set pressure range; if the real-time internal pressure in the accumulator is higher than the set pressure range, the controller controls the on-off state of the solenoid valve group to change, so that the hydraulic oil in the accumulator is returned to the hydraulic oil tank through the solenoid valve group, so that the pressure in the accumulator is maintained within the set pressure range. The second pressure regulating module is used to regulate the working pressure of the rubber hydraulic shock absorber, and the second pressure regulating module includes: a target pressure determination unit, configured to determine a target pressure setting value of the rubber hydraulic shock absorber based on real-time detection data from the rotation speed sensor and the vibration sensor; a pressure regulating unit, for regulating the pressure of the rubber hydraulic shock absorber through the accumulator until the actual working pressure of the rubber hydraulic shock absorber reaches a target pressure setting value; when the actual working pressure of the rubber hydraulic shock absorber is lower than the target pressure setting value, the controller controls the on-off state of the solenoid valve group to change, and the hydraulic oil is input from the accumulator to the rubber hydraulic shock absorber through the solenoid valve group; when the actual working pressure of the rubber hydraulic shock absorber is higher than the target pressure setting value, the controller controls the on-off state of the solenoid valve group to change, and the hydraulic oil in the rubber hydraulic shock absorber is returned to the hydraulic oil tank through the solenoid valve group.

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