A wheel excavator balancing cylinder control system and wheel excavator

Abstract

The invention discloses a tire excavator balance cylinder control system and a tire excavator, and relates to the technical field of excavators. The control system comprises a pump source, a control valve, an accumulator, a first balance cylinder, a second balance cylinder, a check valve, a first check hydraulic lock and a second check hydraulic lock. The output end of the pump source is connected to the oil inlet of the check valve, the control oil inlet of the first check hydraulic lock and the control oil inlet of the second check hydraulic lock through the control valve, respectively. A first check hydraulic lock is arranged between the check valve and the first balance cylinder, and a second check hydraulic lock is arranged between the check valve and the second balance cylinder. The oil outlet of the check valve, the oil inlet of the first check hydraulic lock, the oil inlet of the second check hydraulic lock and the accumulator are connected to each other, and the oil outlet of the first check hydraulic lock is connected to the first balance cylinder, and the oil outlet of the second check hydraulic lock is connected to the second balance cylinder. The leaked hydraulic oil can be compensated to ensure the stable support of the axle by the balance cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of excavators, and in particular to a tire excavator balancing cylinder control system and a tire excavator. Background Art

[0002] At present, the front axle structure of a tire excavator is composed of a beam-type bridge body, steering knuckle, wheel hub, steering cylinder, balance cylinder, a frame fixed above the two balance cylinders, and a support seat in the middle of the frame. The bridge body is made of cast steel and plays a supporting role in connecting with the chassis. It is maneuverable and flexible and can move quickly between construction sites.

[0003] When encountering uneven roads, in order to ensure that the four tires are in contact with the ground and prevent the tires from leaving the ground and causing vehicle instability, the front axle tires are required to swing up and down with the uneven road surface to adapt to the uneven road surface. At the same time, when the excavator is excavating, the front axle tires are required to be locked and cannot swing up and down to ensure stability during excavation.

[0004] In the prior art, the method of locking the up and down swing of the front axle tire generally adopts the form of a one-way hydraulic lock. However, during and after the control oil circuit is cut off, due to the leakage of hydraulic oil, the piston rod of the balancing cylinder retracts under the action of external force, and a gap appears between the balancing cylinder and the axle, resulting in separation. Due to the separation of the balancing cylinder and the axle, the vehicle load only transmits force to the axle through the middle support seat, and the balancing cylinder impacts the connection, which makes the frame and the axle easily damaged. Summary of the invention

[0005] The object of the present invention is to provide a wheel excavator balancing cylinder control system and a wheel excavator, which can compensate for leaked hydraulic oil and ensure stable support of the axle by the balancing cylinder.

[0006] The embodiment of the present invention is achieved as follows:

[0007] According to one aspect of an embodiment of the present invention, a control system for a balancing cylinder of a tire excavator is provided, comprising a pump source, a control valve, an accumulator, a first balancing cylinder, a second balancing 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 connected 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 through the control valve, the first one-way hydraulic lock is arranged between the one-way valve and the first balancing cylinder, the second one-way hydraulic lock is arranged between the one-way valve and the second balancing cylinder, the oil outlet of the 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 accumulator are connected to each other, the oil outlet of the first one-way hydraulic lock is connected to the first balancing cylinder, and the oil outlet of the second one-way hydraulic lock is connected to the second balancing cylinder.

[0008] Optionally, the tire excavator balance cylinder control system further includes a pressure reducing valve, which is arranged between the control valve and the one-way valve.

[0009] Optionally, the pressure reducing valve comprises an overflow port, and the overflow port is connected to the oil tank through a pressure relief pipe.

[0010] Optionally, the accumulator includes a sealed shell with a piston arranged in the shell, the piston dividing the shell into a first chamber and a second chamber, the first chamber being respectively connected to the oil outlet of the one-way valve, the oil inlet of the first one-way hydraulic lock and the oil inlet of the second one-way hydraulic lock, and the second chamber is sealed with nitrogen.

[0011] Optionally, the control valve is an electromagnetic reversing valve, and the electromagnetic reversing valve is provided with a cutoff gear position.

[0012] Optionally, the tire excavator balance cylinder control system further includes a pressure gauge, and the pressure gauge is arranged between the control valve and the one-way valve.

[0013] Optionally, the tire excavator balance cylinder control system further includes a thermometer, and the thermometer is disposed in the oil tank.

[0014] Optionally, the tire excavator balance cylinder control system further includes a filter, and the filter is arranged at the oil return port of the oil tank.

[0015] Another aspect of an embodiment of the present invention provides a tire excavator, comprising a frame and an axle, and a tire excavator balancing cylinder control system as described in any one of the above, wherein the frame and the axle are connected via a balancing cylinder.

[0016] The beneficial effects of the embodiments of the present invention include:

[0017] The tire excavator balance cylinder control system and tire excavator provided by the embodiment of the present invention can make the hydraulic oil be transported through the one-way valve through the oil inlet of the one-way valve connected to 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 respectively connected to the control valve, the control valve can be used to control the flow of hydraulic oil to the control oil port of the first one-way hydraulic lock and the control oil port of the second one-way hydraulic lock, thereby enabling the first one-way hydraulic lock and the second one-way hydraulic lock to achieve the on-off of the reflux. Through the control valve connected to the output end of the pump source, the on-off of the 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 to switch the oil circuit. Through the oil outlet of the 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 accumulator that are connected to each other, when the hydraulic oil circuit is cut off, the hydraulic oil is prevented from flowing back through the one-way valve, and the hydraulic oil in the accumulator is prevented from leaking. When hydraulic oil leakage occurs in the first balancing oil cylinder or the second balancing oil cylinder, the leaked hydraulic oil will be replenished under the pressure of the accumulator, which is beneficial to enhance the stable support of the first balancing oil cylinder and the second balancing oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 One of the principle schematic diagrams of the wheel excavator balance cylinder control system provided by the embodiment of the present invention;

[0020] Figure 2 The second schematic diagram of the principle of the wheel excavator balance cylinder control system provided by the embodiment of the present invention.

[0021] Icons: 100- wheel excavator balance cylinder control system; 110- control valve; 120- accumulator; 122- housing; 124- piston; 126- first chamber; 128- second chamber; 130- first balance cylinder; 140- second balance cylinder; 150- one-way valve; 160- first one-way hydraulic lock; 170- second one-way hydraulic lock; 180- pressure reducing valve; 190- oil tank. DETAILED DESCRIPTION

[0022] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Please refer to Figure 1 This embodiment provides a wheel excavator balance cylinder control system 100, including a pump source ( Figure 1), the control valve 110, the accumulator 120, the first balancing oil cylinder 130, the second balancing oil cylinder 140, the one-way valve 150, the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170. The output end of the pump source is connected to the oil inlet of the one-way 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 through the control valve 110. The first one-way hydraulic lock 160 is arranged between the one-way valve 150 and the first balancing oil cylinder 130, and the second one-way hydraulic lock 170 is arranged between the one-way valve 150 and the second balancing oil cylinder 140. The oil outlet of the one-way valve 150, the oil inlet of the first one-way hydraulic lock 160, the second one-way hydraulic lock 170 The oil inlet of the first one-way hydraulic lock 160 is connected to the accumulator 120 , the oil outlet of the first one-way hydraulic lock 160 is connected to the first balancing cylinder 130 , and the oil outlet of the second one-way hydraulic lock 170 is connected to the second balancing cylinder 140 .

[0028] It should be noted that the wheel excavator balance cylinder control system 100 provided in this embodiment has two working states: working state 1, please refer to Figure 1 , the pump source and the control valve 110 are in a conducting state, and the oil circuit is normally conducting. Since the one-way valve 150 is in a forward conducting state, the oil outlet of the one-way 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 are interconnected, and the hydraulic oil through the one-way valve 150 is pressurized to the accumulator 120. At the same time, the hydraulic oil through the control valve 110 is respectively connected to the oil inlet of the one-way 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 the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 are both in an unlocked state. At this time, the first balancing oil cylinder 130 and the second balancing oil cylinder 140 can be normally extended and retracted, so that the axle can swing up and down with the unevenness of the road surface.

[0029] Please refer to Working Status 2 Figure 2 , the pump source and the control valve 110 are in a cut-off state. At this time, the one-way valve 150 is in a reverse cut-off state. At the same time, 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 balancing oil cylinder 130 and the second balancing oil cylinder 140 are in a high-pressure state before the cut-off, which can lock the axle from swinging up and down. In addition, the accumulator 120 can replenish the oil of the first balancing oil cylinder 130 and the second balancing oil cylinder 140 to avoid a gap between the piston rods of the first balancing oil cylinder 130 and the second balancing oil cylinder 140 and the axle, which causes the vehicle to shake during excavation. And ensure that the first balancing oil cylinder 130 and the second balancing oil cylinder 140 effectively support the axle and improve the force condition.

[0030] The tire excavator balance cylinder control system 100 provided by the embodiment of the present invention allows the hydraulic oil to be transported through the one-way valve 150 through the oil inlet of the one-way valve 150 connected to the control valve 110, but the hydraulic oil cannot flow back. Through 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 respectively connected to the control valve 110, the control valve 110 can control the flow of hydraulic oil to 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, thereby enabling the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 to achieve the on-off of the backflow. Through the control valve 110 connected to the output end of the pump source, the on-off of the hydraulic oil flowing to the oil inlet of the one-way 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 can be controlled to switch the oil circuit. Through the interconnected oil outlet of the one-way 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, when the hydraulic oil circuit is cut off, the hydraulic oil is prevented from flowing back through the one-way valve 150, thereby preventing the hydraulic oil in the accumulator 120 from leaking. When the first balancing oil cylinder 130 or the second balancing oil cylinder 140 leaks hydraulic oil, the leaked hydraulic oil will be replenished under the pressure of the accumulator 120, which is conducive to improving the stable support of the first balancing oil cylinder 130 and the second balancing oil cylinder 140.

[0031] like Figure 1 As shown, the wheel excavator balance cylinder control system 100 further includes a pressure reducing valve 180 , which is disposed between the control valve 110 and the one-way valve 150 .

[0032] Specifically, when the hydraulic oil pressure passing through the pressure reducing valve 180 is too high, the pressure reducing valve 180 can relieve the hydraulic oil to ensure that the pressure of the hydraulic oil passing through the one-way valve 150 tends to be stable, avoiding fluctuations in the unstable oil supply pressure and affecting the stability of the first balancing cylinder 130 and the second balancing cylinder 140.

[0033] like Figure 1 As shown, the pressure reducing valve 180 includes an overflow port, which is communicated with the oil tank 190 through a pressure relief pipe.

[0034] Specifically, the overflow port is in a normally closed state. When the pressure passing through the pressure reducing valve 180 is too large and exceeds the threshold of the pressure reducing valve 180, the hydraulic oil overflows from the overflow port to ensure the stability of the pressure in the oil supply pipeline. The hydraulic oil overflowing from the overflow port flows to the oil tank 190 through the pressure relief pipe.

[0035] like Figure 1As shown, the accumulator 120 includes a sealed shell 122, in which a piston 124 is arranged. The piston 124 divides the shell 122 into a first chamber 126 and a second chamber 128. The first chamber 126 is respectively connected to the oil outlet of the one-way valve 150, the oil inlet of the first one-way hydraulic lock 160 and the oil inlet of the second one-way hydraulic lock 170, and nitrogen is sealed in the second chamber 128.

[0036] Specifically, the piston 124 can slide along the housing 122. When the pressure in the pipeline decreases, the hydraulic oil in the first chamber 126 flows to the pipeline to compensate for the pressure of the pipeline. When the pressure in the pipeline 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 becomes smaller, and the accumulator 120 is pressurized. In this way, the accumulator 120 can not only stabilize the pressure of the oil supply pipeline, but also provide pressure compensation for the oil supply pipeline.

[0037] Optionally, the control valve 110 is an electromagnetic reversing valve, and the electromagnetic reversing valve is provided with a cut-off gear. In this way, when the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170 need to be locked, the electromagnetic reversing valve can be directly switched to the cut-off gear to disconnect the hydraulic oil of 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, thereby locking the first one-way hydraulic lock 160 and the second one-way hydraulic lock 170. The pump source can work normally and is responsible for providing hydraulic oil to other pipelines. The working state of the first balancing oil cylinder 130 and the second balancing oil cylinder 140 can be controlled only through the control valve 110.

[0038] Optionally, the wheel excavator balance cylinder control system 100 further includes a pressure gauge, which is disposed between the control valve 110 and the one-way valve 150 .

[0039] In this way, it is possible to observe whether the pressure in the oil supply pipeline of the wheel excavator balance cylinder control system 100 is within the normal range, so as to intuitively see whether there is any abnormality in the oil supply pipeline, which is convenient for subsequent maintenance work.

[0040] Optionally, the wheel excavator balance cylinder control system 100 further includes a thermometer, which is disposed in the oil tank 190 .

[0041] In this way, it is possible to observe whether the oil temperature in the oil tank 190 is within the normal temperature range, so that the staff can perform auxiliary heat dissipation or heating measures according to the oil temperature in the oil tank 190. Ensuring the stability of the working oil temperature also provides the necessary basis for the stability of the first balancing oil cylinder 130 and the second balancing oil cylinder 140.

[0042] Optionally, the wheel excavator balance cylinder control system 100 further includes a filter, which is disposed at the oil return port of the oil tank 190 .

[0043] In this way, the circulating hydraulic oil can flow back to the oil tank 190 through the filter, preventing impurities such as iron filings in the pipeline from affecting the quality of the hydraulic oil, which is beneficial to improving the stability of the oil supply pipeline.

[0044] The embodiment of the present invention further discloses a wheel excavator, comprising a frame and an axle, and a wheel excavator balance cylinder control system 100 as described above. The wheel excavator comprises the same structure and beneficial effects as the wheel excavator balance cylinder control system 100 in the aforementioned embodiment. The structure and beneficial effects of the wheel excavator balance cylinder control system 100 have been described in detail in the aforementioned embodiment, and will not be repeated here.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wheel excavator balance cylinder control system, characterized in that: It includes a pump source, a control valve, an accumulator, a first balancing oil cylinder, a second balancing oil cylinder, a one-way valve, a first one-way hydraulic lock and a second one-way hydraulic lock. The output end of the pump source is connected with 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 through the control valve respectively. The first one-way hydraulic lock is arranged between the one-way valve and the first balancing oil cylinder, and the second one-way hydraulic lock is arranged between the one-way valve and the second balancing oil cylinder. The oil outlet of the 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 accumulator are connected with each other. The oil outlet of the first one-way hydraulic lock is connected with the first balancing oil cylinder, and the oil outlet of the second one-way hydraulic lock is connected with the second balancing oil cylinder.

2. The wheel excavator balance cylinder control system according to claim 1, characterized in that: A pressure reducing valve is also included, and the pressure reducing valve is arranged between the control valve and the one-way valve.

3. The wheel excavator balance cylinder control system according to claim 2, characterized in that: The pressure reducing valve comprises an overflow port, and the overflow port is communicated with the oil tank through a pressure relief pipe.

4. The wheel excavator balance cylinder control system according to claim 1, characterized in that: The accumulator includes a sealed shell, a piston is arranged in the shell, and the piston divides the shell into a first chamber and a second chamber. The first chamber is respectively connected to the oil outlet of the one-way 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 wheel excavator balance cylinder control system according to claim 1, characterized in that: The control valve is an electromagnetic reversing valve, and the electromagnetic reversing valve is provided with a cut-off gear position.

6. The wheel excavator balance cylinder control system according to claim 1, characterized in that: A pressure gauge is also included, and the pressure gauge is arranged between the control valve and the one-way valve.

7. The wheel excavator balance cylinder control system according to claim 3, characterized in that: Also included is a thermometer, which is disposed in the oil tank.

8. The wheel excavator balance cylinder control system according to claim 3, characterized in that: It also includes a filter, which is arranged at the oil return port of the oil tank.

9. A wheel excavator, characterized in that: It comprises a vehicle frame and a vehicle axle, and a tire excavator balancing cylinder control system as described in any one of claims 1 to 8, wherein the vehicle frame and the vehicle axle are connected via a balancing cylinder.

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