Anti-impact hydraulic valve block constant-pressure oil way system

Abstract

The utility model relates to the technical field of hydraulic control, in particular to an anti-impact hydraulic valve block constant pressure oil way system which comprises an oil way system inside a hydraulic valve block and a hydraulic system for supplying hydraulic oil, the oil way system comprises an impact pressure valve block and an electric proportional valve block, and a throttling valve and an overflow valve are arranged inside the impact pressure valve block. The impact pressure valve block is provided with a hydraulic inlet and a hydraulic outlet, a main oil way channel is connected between the hydraulic inlet and the hydraulic outlet, the overflow valve is arranged on the main oil way channel, an oil inlet of the overflow valve is connected with the hydraulic inlet, and an oil outlet of the overflow valve is connected with the hydraulic outlet; the main oil way channel is further connected with a proportional branch line in a forked mode. The throttling valve and the electric proportional valve block are sequentially connected to the proportional branch line in series. A control port of the overflow valve is connected with a pressure branch line provided with a pressure relay. No matter how the inlet pressure supplied by the hydraulic system changes, the system always keeps the outlet pressure supplied to the equipment relatively constant, so that the safe and stable work of the engineering mechanical equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic control technical field, concretely relates to an anti -impact hydraulic valve block constant pressure oil line system. BACKGROUND

[0002] Various engineering mechanical equipment (hereinafter referred to as equipment) need to be used in the construction process of tunnel, and most of the equipment adopts hydraulic oil as power source, and the equipment needs to keep constant hydraulic pressure to maintain the stable work of equipment. The hydraulic power of equipment is mainly supplied through the hydraulic oil line system controlled by hydraulic valve block. However, the import pressure supplied by the existing hydraulic system is usually impacted by certain changes, which easily leads to the outlet pressure provided to the equipment is also unstable, it is difficult to meet the hydraulic requirements of equipment, and further will cause the working state of equipment is not stable enough, and there is certain security risk. Therefore, it is urgent to find a more stable hydraulic valve block constant pressure oil line system. SUMMARY

[0003] In view of the above situation, the utility model provides an anti -impact hydraulic valve block constant pressure oil line system can guarantee that the outlet pressure provided by hydraulic valve block to equipment is not affected by the impact of system import pressure.

[0004] In order to realize the above object, the utility model adopts the following technical scheme:

[0005] An anti -impact hydraulic valve block constant pressure oil line system, including the oil line system in the hydraulic valve block, and the hydraulic system for supplying hydraulic oil for the oil line system, the oil line system includes impact pressure valve block and electric proportional valve block, the impact pressure valve block is internally provided with a throttle valve and a relief valve, one side of the impact pressure valve block is provided with a hydraulic inlet, and the other side is provided with a hydraulic outlet, and the hydraulic inlet is connected with the hydraulic outlet and is connected with the main oil line channel. The relief valve is arranged on the main oil line channel, the oil inlet of the relief valve is connected with the hydraulic inlet, and the oil outlet of the relief valve is connected with the hydraulic outlet.

[0006] The main oil line channel upstream of the relief valve is also bifurcated and connected with a proportional branch line, and the throttle valve and the electric proportional valve block are connected in series on the proportional branch line.

[0007] The control port of the relief valve is also connected with a pressure branch line, and the pressure branch line is provided with a pressure relay, and the pressure relay can control the opening and closing of the electric contact by using the liquid pressure signal.

[0008] Further, the pressure branch line is also provided with a pressure gauge for on-line detection of the hydraulic oil pressure on the pressure branch line.

[0009] Further, the pressure gauge is also connected to the proportional branch line between the throttle valve and the electric proportional valve, for simultaneously detecting the hydraulic oil pressure on the proportional branch line.

[0010] Further, the hydraulic system is equipped with an electrical control system, and the pressure relay and the electric proportional valve are electrically connected to the electrical control system.

[0011] Further, the hydraulic oil discharged from the end of the proportional branch line is finally returned to the hydraulic oil tank of the hydraulic system, for recycling of the hydraulic oil.

[0012] Further, the hydraulic outlet is finally delivered to the engineering mechanical equipment powered by the hydraulic oil, for providing the engineering mechanical equipment with hydraulic power.

[0013] The utility model also includes other components that can make it normal use, are conventional means in the art, in addition, the device or component not added in the utility model, such as: electric proportional valve, throttle valve, overflow valve, pressure gauge, pressure relay, and hydraulic system and its hydraulic oil tank and electrical control system etc., all adopt prior art in the field.

[0014] The utility model has the advantages as follows:

[0015] The utility model provides an anti-impact hydraulic valve block constant pressure oil path system, no matter how the import pressure of the hydraulic system changes, can always keep the outlet pressure of the hydraulic valve block supplied to equipment is relatively constant, to guarantee that engineering mechanical equipment works safely and stably. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of the anti-impact hydraulic valve block constant pressure oil path system in the embodiment. DETAILED DESCRIPTION

[0017] The technical scheme of the utility model will be clearly and completely described below in combination with specific embodiments, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0018] EMBODIMENT

[0019] As Figure 1 shown, an anti-impact hydraulic valve block constant pressure oil path system includes an oil path system inside a hydraulic valve block and a hydraulic system (not shown in the figure) for supplying the oil path system with hydraulic oil.The hydraulic system adopts prior art, and will not be described in detail here.

[0020] The oil circuit system comprises an impact pressure valve block 1 and an electric proportional valve block 2, the impact pressure valve block is internally provided with a throttle valve 1-1 and an overflow valve 1-2, one side of the impact pressure valve block is provided with a hydraulic inlet 1-3, the other side is provided with a hydraulic outlet 1-4, and a main oil circuit passage 1-5 is connected between the hydraulic inlet and the hydraulic outlet.

[0021] The overflow valve is arranged on the main oil circuit passage, the oil inlet of the overflow valve is connected to the hydraulic inlet, the oil outlet of the overflow valve is connected to the hydraulic outlet, and the hydraulic outlet is finally delivered to the engineering machinery equipment (not shown in the figure) powered by hydraulic oil to provide hydraulic power for the engineering machinery equipment. The engineering machinery equipment belongs to the prior art, and will not be described in detail here.

[0022] The main oil circuit passage upstream of the overflow valve is also branched and connected with a proportional branch line 2-1, and the throttle valve and the electric proportional valve block are connected in series on the proportional branch line. The electric proportional valve, also known as an electro-hydraulic proportional valve, can convert electrical signals into force or displacement in proportion, thereby continuously controlling the hydraulic oil pressure and flow.

[0023] The hydraulic oil discharged at the end of the proportional branch line is finally returned to the hydraulic oil tank 2-2 of the hydraulic system for recycling. The electric proportional valve and the hydraulic oil tank are both prior art, and will not be described in detail here.

[0024] The overflow valve is a pressure control valve for constant pressure overflow, pressure stabilization, system unloading and safety protection. According to the internal structure and working principle of the overflow valve, it can be divided into direct-acting type and pilot type. Here, the pilot type overflow valve is preferred, which mainly comprises a main valve body and a pilot valve connected in one body. The pilot type overflow valve is provided with an oil inlet, an oil outlet and a control port.

[0025] The control port of the overflow valve is also connected with a pressure branch line 1-6, and the pressure branch line is provided with a pressure relay 1-7. The pressure relay, also known as a pressure switch, is a hydraulic and electrical conversion element that uses liquid pressure signals to control the opening and closing of electrical contacts.

[0026] The overflow valve and the pressure relay both adopt the prior art, and their internal structures and working principles will not be described in detail here.

[0027] A pressure gauge 1-8 is arranged on the pressure branch line and the proportional branch line between the throttle valve and the electric proportional valve. The pressure gauge adopts an electric contact pressure gauge for simultaneously detecting the hydraulic oil pressure on the pressure branch line and the proportional branch line.

[0028] The hydraulic system is provided with an electrical control system (not shown in the figure), and the electrical contact pressure gauge, the pressure relay and the electrical proportional valve are electrically connected with the electrical control system.

[0029] The working principle of the utility model is as follows:

[0030] The external hydraulic system supplies hydraulic oil to the hydraulic inlet of the hydraulic valve block, and the hydraulic oil after entering the hydraulic valve block first needs to pass through the throttle valve and the electrical proportional valve on the proportional branch line for throttling control and proportional distribution, realizes first pressure division, a part of the hydraulic oil returns to the hydraulic tank of the hydraulic system through the proportional branch line, and the other part is sent to the overflow valve through the main oil passage, the overflow valve has good pressure regulating and pressure stabilizing functions, the pressure gauge and the pressure relay can also feed back real-time pressure to the electrical control system, and then realize timely control of the shunt proportion of the electrical proportional valve, the output hydraulic outlet pressure after passing through the overflow valve can achieve a very constant effect, realizes second pressure stabilization, and then can provide constant hydraulic power source for engineering machinery equipment.

[0031] The technical scheme of the utility model is not limited to the above specific embodiments, and many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments, and any technical modification made within the spirit and principle of the utility model falls within the protection scope of the utility model.

Claims

1. A shock-resistant hydraulic valve block constant pressure oil passage system comprising an oil passage system inside a hydraulic valve block, and a hydraulic system for supplying hydraulic oil to the oil passage system, characterized by: The oil circuit system comprises an impact pressure valve block and an electric proportional valve block, the impact pressure valve block is internally provided with a throttle valve and a relief valve, one side of the impact pressure valve block is provided with a hydraulic inlet, the other side is provided with a hydraulic outlet, a main oil passage is connected between the hydraulic inlet and the hydraulic outlet, the relief valve is arranged on the main oil passage, an oil inlet of the relief valve is connected with the hydraulic inlet, and an oil outlet of the relief valve is connected with the hydraulic outlet; a proportional branch line is further branched and connected on the main oil passage upstream of the relief valve, the throttle valve and the electric proportional valve block are connected in series on the proportional branch line; a pressure branch line is further connected on a control port of the relief valve, and a pressure relay is arranged on the pressure branch line.

2. The shock resistant hydraulic valve block constant pressure circuit system of claim 1, wherein: A pressure gauge is further arranged on the pressure branch line for detecting the hydraulic oil pressure on the pressure branch line.

3. The shock resistant hydraulic valve block constant pressure circuit system of claim 2, wherein: The pressure gauge is further connected with the proportional branch line between the throttle valve and the electric proportional valve, and simultaneously detects the hydraulic oil pressure on the proportional branch line.

4. The shock resistant hydraulic valve block constant pressure circuit system of claim 1, wherein: The hydraulic oil discharged at the end of the proportional branch line is finally returned to the hydraulic oil tank of the hydraulic system.

5. The shock resistant hydraulic valve block constant pressure circuit system of claim 1, wherein: The hydraulic outlet is finally delivered to the engineering mechanical equipment with hydraulic oil as a power source.

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