阅读说明：本技术 工程机械的能量回收系统和工程机械 (Energy recovery system for construction machine and construction machine ) 是由 金月峰 宋之克 耿家文 费树辉 赵光 宋萌 范凯俊 夏炎 王东 樊云鹏 赵映龙 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种工程机械的能量回收系统和工程机械。工程机械的能量回收系统包括活塞蓄能器、储气瓶、通气管和压力检测组件,活塞蓄能器包括油腔室和气腔室,油腔室被配置为与动臂油缸的无杆腔流体连接,储气瓶与气腔室连接,通气管设置于气腔室与储气瓶之间以使气体在气腔室与储气瓶之间流通,压力检测组件包括至少两个压力传感器,至少两个压力传感器被配置为对通气管的不同位置的气体压力进行检测。本发明的能量回收系统通过对通气管的不同位置处的气体压力进行检测,从而根据不同位置处的压力是否相同来判断系统是否漏气,这样就可排除环境温度对气体压力的影响,进而实现对系统是否漏气的准确判断。(The invention discloses an energy recovery system of engineering machinery and the engineering machinery. Engineering machine tool's energy recuperation system includes piston energy storage ware, the gas bomb, breather pipe and pressure measurement subassembly, piston energy storage ware includes oil pocket and gas cavity room, the oil pocket is configured to be connected with the rodless chamber fluid of movable arm hydro-cylinder, the gas bomb is connected with the gas cavity room, the breather pipe sets up so that gas circulates between gas cavity room and gas bomb between the gas cavity room, the pressure measurement subassembly includes two at least pressure sensor, two at least pressure sensor are configured to detect the gas pressure of the different positions of breather pipe. The energy recovery system of the invention detects the gas pressure at different positions of the vent pipe, thereby judging whether the system leaks gas or not according to whether the pressure at different positions is the same or not, eliminating the influence of the environmental temperature on the gas pressure and further realizing the accurate judgment of whether the system leaks gas or not.)

1. An energy recovery system for a construction machine, comprising:

a piston accumulator (8) comprising an oil chamber (C) and a gas chamber (D), the oil chamber (C) being configured to be in fluid connection with a rodless cavity of a boom cylinder (7);

a gas cylinder (12) connected to the gas chamber (D);

a vent pipe arranged between the gas chamber (D) and the gas cylinder (12) to allow gas to pass between the gas chamber (D) and the gas cylinder (12); and

a pressure detection assembly comprising at least two pressure sensors configured to detect gas pressures at different locations of the vent pipe.

2. The energy recovery system of a working machine according to claim 1, characterized in that the at least two pressure sensors comprise a first pressure sensor (9) and a second pressure sensor (14), the first pressure sensor (9) and the second pressure sensor (14) being configured to detect the gas pressure at both ends of the vent pipe, respectively.

3. The energy recovery system of a working machine according to claim 2, characterized in that the at least two pressure sensors further comprise a third pressure sensor (18), the third pressure sensor (18) being configured to detect a gas pressure in the middle of the vent pipe.

4. The energy recovery system of a construction machine according to claim 1, wherein the pressure detection assembly further comprises at least two transition blocks disposed at different positions of the vent pipe, and the at least two pressure sensors are correspondingly mounted on the at least two transition blocks.

5. The energy recovery system of a working machine according to claim 4, wherein the transition block includes a first port, a second port, and a third port communicating with each other, the first port and the second port being arranged in an axial direction of the breather pipe to communicate the gas from the first port to the second port, the pressure sensor being mounted at the third port.

6. The energy recovery system of a work machine of claim 4, wherein the transition block further comprises a fourth port for mounting a pressure tap.

7. The energy recovery system of a work machine of claim 1, wherein the at least two pressure sensors are configured to detect varying fluctuations in gas pressure at different locations of the vent pipe.

8. The energy recovery system of a construction machine according to claim 1, further comprising a controller communicatively connected to the at least two pressure sensors, wherein the controller determines whether the energy recovery system is leaking gas based on the gas pressures detected by the at least two pressure sensors at different positions of the vent pipe.

9. A working machine, characterized by comprising a boom cylinder (7) and an energy recovery system according to any one of claims 1 to 8.

10. The working machine according to claim 9, further comprising a hydraulic pump (2) and a hydraulic motor (3) in driving connection with the hydraulic pump (2), wherein an oil port of the hydraulic motor (3) is in fluid connection with the rodless cavity of the boom cylinder (7).

11. The work machine of claim 9, wherein the work machine is an excavator.

Technical Field

The invention relates to the field of engineering machinery, in particular to an energy recovery system of engineering machinery and the engineering machinery.

Background

The existing excavator is generally provided with an energy recovery system, the energy recovery system stores the potential energy of the movable arm and the rotary kinetic energy in the form of high-pressure oil in an energy accumulator, and the nitrogen pressure in the energy accumulator needs to be maintained for a long time. If the nitrogen leaks, the energy recovery effect is affected.

Disclosure of Invention

The invention provides an energy recovery system of an engineering machine and the engineering machine, which are used for judging whether the energy recovery system leaks air or not.

A first aspect of the present invention provides an energy recovery system for a construction machine, including:

a piston accumulator including an oil chamber and a gas chamber, the oil chamber configured to be fluidly connected with a rodless chamber of a boom cylinder;

the gas storage cylinder is connected with the gas chamber;

a vent pipe arranged between the gas chamber and the gas storage cylinder to enable gas to circulate between the gas chamber and the gas storage cylinder; and

a pressure detection assembly comprising at least two pressure sensors configured to detect gas pressures at different locations of the vent pipe.

In some embodiments, the at least two pressure sensors include a first pressure sensor and a second pressure sensor configured to detect gas pressures at both ends of the vent pipe, respectively.

In some embodiments, the at least two pressure sensors further comprise a third pressure sensor configured to detect a gas pressure in a middle portion of the vent pipe.

In some embodiments, the pressure detection assembly further comprises at least two transition blocks disposed at different positions of the vent pipe, and the at least two pressure sensors are correspondingly mounted on the at least two transition blocks.

In some embodiments, the transition block includes a first port, a second port, and a third port in communication with each other, the first port and the second port being arranged in an axial direction of the vent pipe to communicate gas from the first port to the second port, the pressure sensor being mounted at the third port.

In some embodiments, the transition block further comprises a fourth port for mounting a pressure tap.

In some embodiments, the at least two pressure sensors are configured to detect varying fluctuations in gas pressure at different locations of the vent pipe.

In some embodiments, the energy recovery system further comprises a controller in communication with the at least two pressure sensors, and the controller determines whether the energy recovery system leaks air based on the gas pressures at different positions of the vent pipe detected by the at least two pressure sensors.

The invention provides engineering machinery which comprises a boom oil cylinder and the energy recovery system.

In some embodiments, the hydraulic system further comprises a hydraulic pump and a hydraulic motor in driving connection with the hydraulic pump, and an oil port of the hydraulic motor is in fluid connection with the rodless cavity of the boom cylinder.

In some embodiments, the work machine is an excavator.

Based on the technical scheme provided by the invention, the energy recovery system of the engineering machinery comprises a piston energy accumulator, a gas storage cylinder, a vent pipe and a pressure detection assembly, wherein the piston energy accumulator comprises an oil chamber and a gas chamber, the oil chamber is configured to be in fluid connection with a rodless cavity of a movable arm oil cylinder, the gas storage cylinder is connected with the gas chamber, the vent pipe is arranged between the gas chamber and the gas storage cylinder so as to enable gas to circulate between the gas chamber and the gas storage cylinder, and the pressure detection assembly comprises at least two pressure sensors which are configured to detect the gas pressures of different positions of the vent pipe. The energy recovery system of the invention detects the gas pressure at different positions of the vent pipe, thereby judging whether the system leaks gas or not according to whether the pressure at different positions is the same or not, eliminating the influence of the environmental temperature on the gas pressure and further realizing the accurate judgment of whether the system leaks gas or not.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a hydraulic structural diagram of an excavator according to an embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

In order to detect whether gas leaks in the energy recovery system, it is necessary to detect the gas pressure of the energy recovery system. However, there are many factors affecting the gas pressure, for example, the reduction of the ambient temperature also brings the reduction of the gas pressure in the system, so if only one position is set for pressure detection, it is not possible to obtain an accurate judgment whether the system leaks gas at all.

Based on the above problems, an embodiment of the present invention provides an energy recovery system to accurately determine whether the system leaks air.

Referring to fig. 1, an energy recovery system of a construction machine according to an embodiment of the present invention includes:

a piston accumulator 8 including an oil chamber C configured to be fluidly connected with the rodless chamber a of the boom cylinder 7 and a gas chamber D;

the gas storage cylinder 12 is connected with the gas chamber D;

a ventilation pipe provided between the gas chamber D and the gas bomb 12 to allow gas to flow between the gas chamber D and the gas bomb 12; and

a pressure detection assembly comprising at least two pressure sensors configured to detect gas pressures at different locations of the vent pipe.

According to the energy recovery system disclosed by the embodiment of the invention, the gas pressures at different positions of the vent pipe are detected, so that whether the system leaks gas or not is judged according to whether the pressures at different positions are the same or not, the influence of the environmental temperature on the gas pressure can be eliminated, and the accurate judgment on whether the system leaks gas or not is further realized.

In some embodiments, the energy recovery system further includes a controller, the controller is in communication connection with the at least two pressure sensors to obtain gas pressure values detected by the at least two pressure sensors, and if the at least two gas pressure values are the same, it can be determined that the system is free of gas leakage; if at least two gas pressure values are different, the system can be judged to be leaked.

In other embodiments, the pressure sensors continuously detect the gas pressure in real time and send the detected pressure values at different times to the controller, the controller obtains the change of the gas pressure at different positions according to the pressure values detected by the at least two pressure sensors, and if the change of the gas pressure at different positions is the same, it can be determined that the system is not leaked; if the gas pressure changes at different positions are different, the system can be judged to have gas leakage.

In some embodiments, referring to fig. 1, the at least two pressure sensors comprise a first pressure sensor 9 and a second pressure sensor 14, the first pressure sensor 9 and the second pressure sensor 14 being configured to detect the gas pressure at both ends of the ventilation pipe, respectively. If gas leakage occurs, the gas pressures at the two ends of the vent pipe are different, so that whether gas leakage occurs or not can be accurately judged by detecting the gas pressures at the two ends of the vent pipe.

In some embodiments, referring to fig. 1, the at least two pressure sensors further comprise a third pressure sensor 18, the third pressure sensor 18 being configured to detect a gas pressure in a middle portion of the ventilation pipe.

In order to facilitate the arrangement, the vent pipe of some embodiments is a rubber pipe, and in order to install the pressure sensor on the rubber pipe, the pressure detection assembly further includes at least two transition blocks disposed at different positions of the vent pipe, and the at least two pressure sensors are correspondingly installed on the at least two transition blocks.

Referring to fig. 1, the vent tube of one embodiment includes a first vent tube 19, a second vent tube 16, a first transition block 10, a second transition block 13, and a third transition block 17. The first transition block 10 is connected to a first end of a first vent pipe 19, the second transition block 13 is connected to a second end of a second vent pipe 16, and the third transition block 17 connects the second end of the first vent pipe 19 and the first end of the second vent pipe 16.

All the transition blocks are made of metal materials.

The structure of each of the first, second and third transition blocks 10, 13, 17 is the same. Specifically, the transition block includes first port, second port, third port and the fourth port that communicates each other, and first port and second port are arranged so that gaseous circulation to the second port from first port along gaseous circulation direction, and pressure sensor installs in third port department, and pressure measurement connects in fourth port department.

When the controller judges that the system leaks gas according to the gas pressure values detected by the at least two pressure sensors, the pressure measuring connectors are used for carrying out mechanical detection and confirmation on the gas pressure at different positions so as to prevent the pressure sensors from generating signal connection errors and the like.

The embodiment of the invention also provides engineering machinery which comprises a movable arm oil cylinder 7 and the energy recovery system.

Referring to fig. 1, the construction machine further includes a hydraulic pump 2 and a hydraulic motor 3 drivingly connected to the hydraulic pump 2, and an oil port of the hydraulic motor 3 is fluidly connected to a rodless chamber of a boom cylinder 7. The oil liquid in the rodless cavity of the movable arm oil cylinder 7 is discharged under the action of the gravity of the working device and respectively enters the piston energy accumulator 8 and the hydraulic motor 3, the hydraulic motor 3 drives the hydraulic pump 2 to work through the clutch 4, the output power of the engine is reduced, and therefore the purpose of energy conservation is achieved.

The construction machine of the embodiment of the invention can be an excavator.

The construction of the excavator of the embodiment shown in fig. 1 will be described in detail.

As shown in fig. 1, the excavator of the present embodiment includes a hydraulic oil tank 1, a hydraulic pump 2, a hydraulic motor 3, a clutch 4, a selector valve 5, a check valve 6, a boom cylinder 7, and an energy recovery system. The energy recovery system comprises a piston accumulator 8, a first pressure sensor 9, a first transition block 10, a first ball valve 11, a first vent pipe 19, a second transition block 17, a second pressure sensor 18, a second vent pipe 16, a second ball valve 15, a third transition block 13, a third pressure sensor 14 and a gas storage bottle 12.

The hydraulic motor 3 is mechanically connected to the hydraulic pump 2 via a clutch 4. An oil inlet of the hydraulic pump 2 is connected with the hydraulic oil tank 1, an oil outlet of the hydraulic pump 2 is connected with the reversing valve 5, and the reversing valve 5 is connected with a rodless cavity A of the movable arm oil cylinder 7 through the one-way valve 6. An oil inlet of the hydraulic motor 3 is connected with an oil port of the piston energy accumulator 8 and is simultaneously connected with an oil port of a rodless cavity A of the movable arm oil cylinder 7, and an oil outlet of the hydraulic motor 3 is connected with the hydraulic oil tank 1. The gas port of the piston energy accumulator 8 is connected with the first port of the first transition block 10, the second port of the first transition block 10 is connected with the inlet of the first ball valve 11, the third port of the first transition block 10 is connected with the first sensor 9, the third port of the first transition block 10 is provided with a pressure measuring joint, and the first port, the second port, the third port and the fourth port of the first transition block 10 are communicated with each other. An outlet of the first ball valve 11 is connected with an inlet of a first vent pipe 19, an outlet of the first vent pipe 19 is connected with a first port of a third transition block 17, a second port of the third transition block 17 is connected with an inlet of a second vent pipe 16, a third port of the third transition block 17 is connected with a third sensor 18, a fourth port of the third transition block 17 is provided with a pressure measuring joint, an outlet of the second vent pipe 16 is connected with an inlet of a second ball valve 15, an outlet of the second ball valve 15 is connected with a first port of a second transition block 13, a second port of the second transition block 13 is connected with a second sensor 14, a third port of the second transition block 13 is connected with a gas storage bottle 12, and a fourth port of the second transition block 13 is provided with a pressure measuring joint.

The gas stored in the gas cylinder 12 in this embodiment is nitrogen. The specific working process is as follows:

in the descending process of a movable arm of the excavator, hydraulic oil is output by the hydraulic pump 2 and enters the rod cavity B of the movable arm oil cylinder 7 after passing through the reversing valve 5, oil in the rod-free cavity A of the movable arm oil cylinder 7 is discharged under the action of the gravity of the working device and respectively enters the piston energy accumulator 8 and the hydraulic motor 3, and the hydraulic motor 3 drives the hydraulic pump 2 to work through the clutch 4, so that the output power of an engine is reduced. After the boom descends, the high-pressure oil stored in the piston energy accumulator 8 continues to flow to the hydraulic motor 3 until all the hydraulic oil in the piston energy accumulator 8 is released, so that the energy is recycled. In the process that oil in a rodless cavity A of the movable arm oil cylinder 7 enters an oil cavity C of the piston energy accumulator 8, a piston between the oil cavity C and an air cavity D moves upwards, and nitrogen in the air cavity D sequentially passes through a first transition block 10, a first ball valve 11, a first vent pipe 19, a third transition block 17, a second vent pipe 16, a second ball valve 15 and a second transition block 13 and then enters the gas storage cylinder 12 to complete compression of the nitrogen and energy storage. In the energy release process, nitrogen in the gas storage bottle 12 sequentially passes through the second transition block 13, the second ball valve 15, the second vent pipe 16, the third transition block 17, the first vent pipe 19, the first ball valve 11 and the first transition block 10 to enter the air chamber D of the piston energy accumulator, a piston between the air chamber D and the oil chamber C is pushed to move downwards, hydraulic oil in the oil chamber C is pushed to the hydraulic motor 3, the hydraulic motor 3 drives the hydraulic pump 2 to work through the clutch 4, the nitrogen release is finished, and the release of recovered energy is completed. In the compression and release processes of the nitrogen, if the gas pressures detected by the first pressure sensor 9, the second pressure sensor 14 and the third pressure sensor 18 are the same, the detection of the nitrogen pressure in the working process is realized. In the non-action state of the excavator, the first ball valve 11 and the second ball valve 15 are closed, whether the pressure fluctuation values after the pressure at three different positions changes along with the temperature are the same or not is detected through the first pressure sensor 9, the second pressure sensor 14 and the third pressure sensor 18, if the pressure fluctuation values are the same, the system is free from air leakage, and if the pressure fluctuation values are different, the system is free from air leakage.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.