阅读说明：本技术 一种轮胎式挖掘机平衡油缸控制系统及轮胎式挖掘机 (Tire type excavator balance oil cylinder control system and tire type excavator ) 是由 李春德 杨赋 王建华 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种轮胎式挖掘机平衡油缸控制系统及轮胎式挖掘机,涉及挖掘机技术领域。包括泵源、控制阀、蓄能器、第一平衡油缸、第二平衡油缸、单向阀、第一单向液压锁和第二单向液压锁,泵源的输出端通过控制阀分别与单向阀的进油口、第一单向液压锁的控制油口和第二单向液压锁的控制油口连通,单向阀与第一平衡油缸之间设置有第一单向液压锁,单向阀与所述第二平衡油缸之间设置有第二单向液压锁,单向阀的出油口、第一单向液压锁的进油口、第二单向液压锁的进油口和蓄能器互相连通,第一单向液压锁的出油口与第一平衡油缸连通,第二单向液压锁的出油口与第二平衡油缸连通。能够对泄漏的液压油进行补偿,保证平衡油缸对车桥的稳定支撑。(The invention discloses a control system for a balance oil cylinder of a tire type excavator and the tire type excavator, and relates to the technical field of excavators. The hydraulic pump comprises a pump source, a control valve, an energy accumulator, a first balance oil cylinder, a second balance oil cylinder, a one-way valve, a first one-way hydraulic lock and a second one-way hydraulic lock, wherein the output end of the pump source is respectively communicated with an oil inlet of the one-way valve, a control oil port of the first one-way hydraulic lock and a control oil port of the second one-way hydraulic lock through the control valve, the first one-way hydraulic lock is arranged between the one-way valve and the first balance oil cylinder, the second one-way hydraulic lock is arranged between the one-way valve and the second balance oil cylinder, an oil outlet of the one-way valve, an oil inlet of the first one-way hydraulic lock, an oil inlet of the second one-way hydraulic lock and the energy accumulator are mutually communicated, an oil outlet of the first one-way hydraulic lock is communicated with the first balance. Can compensate the hydraulic oil of leaking, guarantee the stable support of balanced hydro-cylinder to the axle.)

1. A balance oil cylinder control system of a tire excavator is characterized by comprising a pump source, a control valve, an energy accumulator, a first balance oil cylinder, a second balance oil cylinder, a one-way valve, a first one-way hydraulic lock and a second one-way hydraulic lock, wherein the output end of the pump source is respectively communicated with an oil inlet of the one-way valve, a control oil port of the first one-way hydraulic lock and a control oil port of the second one-way hydraulic lock through the control valve, the first one-way hydraulic lock is arranged between the one-way valve and the first balance oil cylinder, the second one-way hydraulic lock is arranged between the one-way valve and the second balance oil cylinder, an oil outlet of the one-way valve, an oil inlet of the first one-way hydraulic lock, an oil inlet of the second one-way hydraulic lock and the energy accumulator are mutually communicated, an oil outlet of the first one-way hydraulic lock is communicated with the first balance oil cylinder, and an oil outlet of the second one-way hydraulic lock is communicated with the second balance oil cylinder.

2. The tire excavator balancing cylinder control system of claim 1, further comprising a pressure relief valve disposed between the control valve and the one-way valve.

3. The control system for the balancing cylinder of the tire type excavator according to claim 2, wherein the pressure reducing valve includes an overflow port, and the overflow port is communicated with the oil tank through a pressure relief pipeline.

4. The control system for the balancing cylinder of the rubber-tyred excavator according to claim 1, wherein the accumulator comprises a sealed housing, a piston is disposed in the housing, the housing is divided into a first chamber and a second chamber by the piston, the first chamber is respectively communicated with the oil outlet of the check valve, the oil inlet of the first one-way hydraulic lock and the oil inlet of the second one-way hydraulic lock, and nitrogen is sealed in the second chamber.

5. The control system for the balancing cylinder of the tire type excavator according to claim 1, wherein the control valve is an electromagnetic directional valve, and the electromagnetic directional valve is provided with a cut-off gear.

6. The control system for the balancing cylinder of the rubber-tyred excavator according to claim 1, further comprising a pressure gauge disposed between the control valve and the check valve.

7. The tire excavator balancing cylinder control system of claim 3, further comprising a thermometer disposed within the tank.

8. The control system for the balancing cylinder of the tire type excavator according to claim 3, further comprising a filter provided at a return port of the oil tank.

9. A tire-type excavator, comprising a frame and an axle, and the control system of the balancing cylinder of the tire-type excavator according to any one of claims 1 to 8, wherein the frame and the axle are connected through the balancing cylinder.

Technical Field

The invention relates to the technical field of excavators, in particular to a control system for a balance oil cylinder of a tire type excavator and the tire type excavator.

Background

At present, a front axle structure of a tire excavator is composed of an axle body with a beam structure, a steering knuckle, a wheel hub, a steering oil cylinder, a balance oil cylinder, a frame fixed above the two balance oil cylinders and a support seat in the middle of the frame, wherein the axle body is made of cast steel and plays a role in connecting and supporting with a chassis, and the front axle structure of the tire excavator is flexible in maneuvering and can quickly walk among construction sites.

When the excavator works for excavating, the front axle tires are required to be locked and cannot swing up and down, and the stability during excavating is ensured.

Disclosure of Invention

The invention aims to provide a control system of a balancing cylinder of a tire type excavator and the tire type excavator, which can compensate leaked hydraulic oil and ensure the stable support of the balancing cylinder to an axle.

The embodiment of the invention is realized by the following steps:

in one aspect of the embodiments of the present invention, a control system for a balancing cylinder of a tire-type excavator is provided, which includes a pump source, a control valve, an energy accumulator, a first balancing cylinder, a second balancing cylinder, a check valve, a first one-way hydraulic lock and a second one-way hydraulic lock, wherein an output end of the pump source is respectively communicated with an oil inlet of the check valve, a control oil port of the first one-way hydraulic lock and a control oil port of the second one-way hydraulic lock through the control valve, the first one-way hydraulic lock is disposed between the check valve and the first balancing cylinder, the second one-way hydraulic lock is disposed between the check valve and the second balancing cylinder, an oil outlet of the check valve, an oil inlet of the first one-way hydraulic lock, an oil inlet of the second one-way hydraulic lock and the energy accumulator are communicated with each other, an oil outlet of the first one-way hydraulic lock is communicated with the first balancing cylinder, and an oil outlet of the second one-way hydraulic lock is communicated with the second balance oil cylinder.

Optionally, the balancing cylinder control system of the tire type excavator further comprises a pressure reducing valve, and the pressure reducing valve is arranged between the control valve and the one-way valve.

Optionally, the pressure reducing valve comprises an overflow port, the overflow port being in communication with the oil tank via a pressure relief conduit.

Optionally, the accumulator includes a sealed housing, a piston is disposed in the housing, the piston divides the housing into a first chamber and a second chamber, the first chamber is respectively communicated with the oil outlet of the check valve, the oil inlet of the first one-way hydraulic lock and the oil inlet of the second one-way hydraulic lock, and nitrogen is sealed in the second chamber.

Optionally, the control valve is an electromagnetic directional valve, and the electromagnetic directional valve is provided with a cut-off gear.

Optionally, the balancing cylinder control system of the rubber-tyred excavator further comprises a pressure gauge, and the pressure gauge is arranged between the control valve and the one-way valve.

Optionally, the balancing cylinder control system of the tire type excavator further comprises a thermometer, and the thermometer is arranged in the oil tank.

Optionally, the balancing cylinder control system of the tire type excavator further comprises a filter, and the filter is arranged at the oil return port of the oil tank.

In another aspect of the embodiments of the present invention, there is provided a tire type excavator, including a frame and an axle, and the balancing cylinder control system of the tire type excavator as described in any one of the above, where the frame and the axle are connected through a balancing cylinder.

The embodiment of the invention has the beneficial effects that:

according to the balance oil cylinder control system of the tire type excavator and the tire type excavator, provided by the embodiment of the invention, hydraulic oil can be conveyed through the one-way valve through the oil inlet of the one-way valve communicated with the control valve, but the hydraulic oil cannot flow back. Through the control oil port of the first one-way hydraulic lock and the control oil port of the second one-way hydraulic lock which are respectively communicated with the control valve, the on-off of the hydraulic oil flowing to the control oil port of the first one-way hydraulic lock and the on-off of the control oil port of the second one-way hydraulic lock can be controlled through the control valve, and then the on-off of the backflow of the first one-way hydraulic lock and the backflow of the second one-way hydraulic lock are realized. Through the control valve communicated with the output end of the pump source, the on-off of hydraulic oil flowing to the oil inlet of the one-way valve, the control oil port of the first one-way hydraulic lock and the control oil port of the second one-way hydraulic lock can be controlled, and the switching of the oil way is carried out. Through the oil outlet of the mutually communicated one-way valve, the oil inlet of the first one-way hydraulic lock, the oil inlet of the second one-way hydraulic lock and the energy accumulator, when the hydraulic oil way is cut off, the hydraulic oil is prevented from flowing back through the one-way valve, and the hydraulic oil in the energy accumulator is prevented from leaking. When the first balance oil cylinder or the second balance oil cylinder leaks hydraulic oil, the leaked hydraulic oil can be supplemented under the pressure of the energy accumulator, and the stable support of the first balance oil cylinder and the second balance oil cylinder is favorably promoted.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of a balancing cylinder control system of a tire excavator according to an embodiment of the present invention;

fig. 2 is a second schematic diagram of a balancing cylinder control system of a tire type excavator according to an embodiment of the present invention.

Icon: 100-a balancing cylinder control system of a tire type excavator; 110-a control valve; 120-an accumulator; 122-a housing; 124-a piston; 126-a first chamber; 128-a second chamber; 130-a first balance oil cylinder; 140-a second balance oil cylinder; 150-a one-way valve; 160-first one-way hydraulic lock; 170-a second one-way hydraulic lock; 180-pressure relief valves; 190-oil tank.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

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, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present embodiment provides a balancing cylinder control system 100 of a tire excavator, including a pump source (not shown in fig. 1), a control valve 110, an accumulator 120, a first balancing cylinder 130, a second balancing cylinder 140, a check valve 150, a first one-way hydraulic lock 160 and a second one-way hydraulic lock 170, an output end of the pump source is respectively communicated with an oil inlet of the check valve 150, a control oil port of the first one-way hydraulic lock 160 and a control oil port of the second one-way hydraulic lock 170 through the control valve 110, the first one-way hydraulic lock 160 is disposed between the check valve 150 and the first balancing cylinder 130, the second one-way hydraulic lock 170 is disposed between the check valve 150 and the second balancing cylinder 140, an oil outlet of the check valve 150, an oil inlet of the first one-way hydraulic lock 160, an oil inlet of the second one-way hydraulic lock 170 and the accumulator 120 are communicated with each other, an oil outlet of the first one-way hydraulic lock 160 is communicated with the first, an oil outlet of the second one-way hydraulic lock 170 is communicated with the second balance cylinder 140.

It should be noted that the control system 100 for the balancing cylinder of the tire excavator provided in this embodiment has two operating states: referring to fig. 1, in the working state, the pump source and the control valve 110 are in a conduction state, and at this time, the oil path is normally conducted, and since the check valve 150 is in a forward conduction state, the oil outlet of the check valve 150, the oil inlet of the first check hydraulic lock 160, the oil inlet of the second check hydraulic lock 170 and the accumulator 120 are communicated with each other, and the hydraulic oil passing through the check valve 150 charges the accumulator 120. Meanwhile, the hydraulic oil passing through the control valve 110 is respectively led to the oil inlet of the check valve 150, the control oil port of the first one-way hydraulic lock 160 and the control oil port of the second one-way hydraulic lock 170, and both the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 are in an unlocked state. At this time, the first balance cylinder 130 and the second balance cylinder 140 can be extended and retracted normally, so that the axle can swing up and down along with the unevenness of the road surface.

Referring to fig. 2, the pump source and the control valve 110 are in a cut-off state, at this time, the check valve 150 is in a reverse cut-off state, and the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 are both in a locked state. The pressure in the accumulator 120 can be maintained, and the oil inlets of the first balance oil cylinder 130 and the second balance oil cylinder 140 are in a high-pressure state before cutting off, so that the axle can be locked and cannot swing up and down. In addition, the accumulator 120 can supplement oil to the first balance oil cylinder 130 and the second balance oil cylinder 140, so that a gap between a piston rod of the first balance oil cylinder 130 and the second balance oil cylinder 140 and an axle is avoided, and the vehicle is prevented from shaking during excavation. And the first balance oil cylinder 130 and the second balance oil cylinder 140 are ensured to effectively support the axle, so that the stress condition is improved.

According to the control system 100 for the balancing cylinder of the tire type excavator provided by the embodiment of the invention, through the oil inlet of the check valve 150 communicated with the control valve 110, hydraulic oil can be conveyed through the check valve 150, but the hydraulic oil cannot flow back. Through the control oil port of the first unidirectional hydraulic lock 160 and the control oil port of the second unidirectional hydraulic lock 170 which are respectively communicated with the control valve 110, the on-off of the hydraulic oil flowing to the control oil port of the first unidirectional hydraulic lock 160 and the control oil port of the second unidirectional hydraulic lock 170 can be controlled through the control valve 110, and then the on-off of the backflow of the first unidirectional hydraulic lock 160 and the second unidirectional hydraulic lock 170 is realized. The control valve 110, which is communicated with the output end of the pump source, can control the on/off of the hydraulic oil flowing to the oil inlet of the check valve 150, the control port of the first one-way hydraulic lock 160, and the control port of the second one-way hydraulic lock 170, so as to switch the oil passages. Through the oil outlet of the check valve 150, the oil inlet of the first one-way hydraulic lock 160, the oil inlet of the second one-way hydraulic lock 170 and the accumulator 120 which are communicated with each other, when the hydraulic oil path is cut off, the hydraulic oil is prevented from flowing back through the check valve 150, and the hydraulic oil in the accumulator 120 is prevented from leaking. When the first balance cylinder 130 or the second balance cylinder 140 leaks hydraulic oil, the leaked hydraulic oil is supplemented under the pressure of the accumulator 120, which is beneficial to lifting the stable support of the first balance cylinder 130 and the second balance cylinder 140.

As shown in fig. 1, the balancing cylinder control system 100 of the wheel excavator further includes a pressure reducing valve 180, the pressure reducing valve 180 being disposed between the control valve 110 and the check valve 150.

Specifically, when the pressure of the hydraulic oil passing through the pressure reducing valve 180 is too high, the pressure reducing valve 180 can relieve the pressure of the hydraulic oil passing through the check valve 150, so that the pressure of the hydraulic oil passing through the check valve 150 tends to be stable, and the stability of the first balance cylinder 130 and the second balance cylinder 140 is prevented from being influenced due to unstable oil supply pressure.

As shown in FIG. 1, the pressure relief valve 180 includes an overflow port that communicates with an oil tank 190 through a pressure relief conduit.

Specifically, the overflow port is in a normally closed state, and when the pressure passing through the pressure reducing valve 180 is too high and exceeds the threshold value of the pressure reducing valve 180, hydraulic oil partially overflows from the overflow port, so that the pressure of the oil supply pipeline is stable. The hydraulic oil overflowing from the overflow port flows to the oil tank 190 through the pressure relief pipe.

As shown in fig. 1, the accumulator 120 includes a sealed housing 122, a piston 124 is disposed in the housing 122, the piston 124 divides the housing 122 into a first chamber 126 and a second chamber 128, the first chamber 126 is respectively communicated with an oil outlet of a check valve 150, an oil inlet of a first one-way hydraulic lock 160 and an oil inlet of a second one-way hydraulic lock 170, and nitrogen is sealed in the second chamber 128.

Specifically, the piston 124 is slidable along the housing 122 to allow hydraulic fluid in the first chamber 126 to flow to the conduit when the pressure in the conduit decreases, thereby compensating for the pressure in the conduit. When the pressure in the conduit increases, the hydraulic oil in the first chamber 126 pushes the piston 124 to move toward the second chamber 128, so that the space in the second chamber 128 is reduced and the accumulator 120 is charged. In this way, the accumulator 120 not only stabilizes the pressure in the supply line, but also provides pressure compensation for the supply line.

Alternatively, the control valve 110 is a solenoid directional valve provided with a cut-off gear. Therefore, when the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 need to be locked, the hydraulic oil at the control oil port of the first one-way hydraulic lock 160 and the hydraulic oil at the control oil port of the second one-way hydraulic lock 170 can be disconnected by directly switching the electromagnetic directional valve to the cut-off position, and the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 can be locked. The pump source can work normally and is responsible for providing hydraulic oil for other pipelines, and the working states of the first balance oil cylinder 130 and the second balance oil cylinder 140 can be controlled only by the control valve 110.

Optionally, the balancing cylinder control system 100 of the tire type excavator further includes a pressure gauge disposed between the control valve 110 and the check valve 150.

Therefore, whether the pressure in the oil supply pipeline of the balance oil cylinder control system 100 of the tire excavator is within the normal interval range can be observed, whether the oil supply pipeline is abnormal or not can be visually observed, and later maintenance work is facilitated.

Optionally, the balancing cylinder control system 100 of the wheel excavator further includes a thermometer disposed in the oil tank 190.

In this way, whether the oil temperature in the oil tank 190 is in a normal temperature range can be observed, so that the worker can perform auxiliary heat dissipation or heating measures according to the oil temperature in the oil tank 190. Ensuring the stability of the temperature of the operating oil also provides a necessary basis for the stability of the first and second balancing cylinders 130 and 140.

Optionally, the balancing cylinder control system 100 of the wheel excavator further includes a filter disposed at the oil return port of the oil tank 190.

So, the quality of impurity influences hydraulic oil such as iron fillings in the pipeline can be avoided in the oil tank 190 of backward flow to the filter to the circulating hydraulic oil, is favorable to promoting oil supply line's stability.

The embodiment of the invention also discloses a tire type excavator, which comprises a frame, an axle and the balance oil cylinder control system 100 of the tire type excavator. The tire type excavator comprises the same structure and beneficial effects as the balance cylinder control system 100 of the tire type excavator in the previous embodiment. The structure and advantages of the balancing cylinder control system 100 of the tire excavator have been described in detail in the foregoing embodiments, and are not described herein again.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.