Pressure selector valve of forcible entry robot

Abstract

The utility model discloses a forcible entry robot pressure selector valve which comprises an oil tank, a hydraulic pump and an oil cylinder, the oil inlet end of the hydraulic pump is connected with the oil tank, a hydraulic reversing valve is connected between the oil outlet end of the hydraulic pump and the oil cylinder, and the oil outlet end of the oil cylinder is connected with the hydraulic reversing valve. A pressure selection valve is arranged between the hydraulic reversing valve and the oil tank, a speed limiting opening LS1 and an oil return opening T1 are formed in the hydraulic reversing valve and are both connected with the pressure selection valve, and the oil return opening T1 is further provided with a branch pipe connected with the oil tank. Compared with the prior art, the pressure selector valve of the forcible entry robot has the advantages that two different pressures are respectively applied to a working state and a walking state.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a pressure selection valve for a demolition robot. Background Art

[0002] A demolition robot is a construction machinery mainly used for crushing operations and is applicable to the sub-field of crushing and demolition in narrow spaces. The main application working conditions include building demolition, cement rotary kiln maintenance, metallurgical furnace kiln maintenance, tunnel construction, mine construction, emergency rescue, nuclear industry, etc.

[0003] The demolition robot mainly uses a breaker for operation, and the working pressure of the breaker is relatively low. The working pressures during walking and when the oil cylinder works are relatively high. For construction machinery with different pressure requirements, generally, the higher working pressure is used as the system pressure, and the pressure is reduced by the overload valve on the directional control valve, or an overflow valve is added to the working device to reduce the pressure by overflow. Reducing the pressure through the overload valve or the overflow valve will waste a large amount of energy and generate a large amount of heat. Especially when the main working pressure is low, the energy waste is more serious. Summary of the Utility Model

[0004] (1) Problems to be Solved

[0005] The technical problem to be solved by the utility model is to overcome the above technical defects and provide a pressure selection valve for a demolition robot that uses two different pressures for the working state and the walking state respectively.

[0006] (2) Technical Solutions

[0007] To solve the above technical problem, the technical solution provided by the utility model is: a pressure selection valve for a demolition robot, including an oil tank, a hydraulic pump, and an oil cylinder. The inlet end of the hydraulic pump is connected to the oil tank, and a hydraulic directional control valve is connected between the outlet end of the hydraulic pump and the oil cylinder. The outlet end of the oil cylinder is connected to the hydraulic directional control valve.

[0008] A pressure selection valve is provided between the hydraulic directional control valve and the oil tank. The hydraulic directional control valve is provided with a speed limiting port LS1 and a return port T1. Both the speed limiting port LS1 and the return port T1 are connected to the pressure selection valve. The return port T1 is also provided with a branch pipe connected to the oil tank.

[0009] A two-position three-way electromagnetic directional control valve is also connected inside the pressure selection valve. The pressure selection valve is provided with a port A connected to the speed limiting port LS1 and a port B connected to the hydraulic pump. The hydraulic pump is provided with a port X that cooperates with the port B. When the two-position three-way electromagnetic directional control valve is activated, the port A is communicated with the port B.

[0010] As an improvement, a first slide valve, a second slide valve and a displacement oil cylinder which are connected in sequence are connected inside the hydraulic pump, and the pressure difference of the first slide valve is 20 bar.

[0011] As an improvement, a pressure reducing valve is also connected inside the pressure selection valve.

[0012] As an improvement, a throttle valve and an overflow valve are connected near the speed limiting port LS1 and the oil return port T1 inside the hydraulic directional control valve.

[0013] (III) Beneficial effects

[0014] The advantages of the present utility model compared with the prior art are as follows: in this application, through the electric control of the solenoid valve, according to different working conditions, it can be quickly switched to different working pressures, and at the same time, by reducing the flow rate of the pump to reach the set pressure, there is no energy loss such as overflow, and the efficiency is maximized. Description of the drawings

[0015] Figure 1 is a schematic structural diagram of a pressure selection valve of a demolition robot.

[0016] Figure 2 is a schematic structural diagram of the extended selection use of the pressure selection valve.

[0017] As shown in the figure: 1, fuel tank; 2, engine; 3, hydraulic pump; 4, pressure selection valve; 5, hydraulic directional control valve; 6, oil cylinder; 7, two-position three-way electromagnetic directional control valve; 8, first slide valve; 9, second slide valve; 10, displacement oil cylinder; 11, pressure reducing valve; 12, throttle valve; 13, overflow valve. Specific embodiments

[0018] The following further illustrates the specific embodiments of the present utility model with reference to the drawings. The same reference numerals are used for the same components.

[0019] It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0020] It should be noted that when an element is referred to as being "fixedly arranged on" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are only for the purpose of illustration.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the description of this utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] To make the content of this utility model easier to be clearly understood, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this utility model.

[0023] Please refer specifically to the attached Figure 1-2 , a pressure selection valve for a demolition robot, comprising an oil tank 1, a hydraulic pump 3 and an oil cylinder 6. The inlet end of the hydraulic pump 3 is connected to the oil tank 1, and a hydraulic directional control valve 5 is provided between the outlet end of the hydraulic pump 3 and the oil cylinder 6. The outlet end of the oil cylinder 6 is connected to the hydraulic directional control valve 5, and a pressure selection valve 4 is provided between the hydraulic directional control valve 5 and the oil tank 1. A speed limiting port LS1 and a return port T1 are provided on the hydraulic directional control valve 5, and both the speed limiting port LS1 and the return port T1 are connected to the pressure selection valve 4. A branch pipe connected to the oil tank 1 is also provided at the return port T1.

[0024] A two-position three-way electromagnetic directional control valve 7 is also connected inside the pressure selection valve 4. An oil port A connected to the speed limiting port LS1 and an oil port B connected to the hydraulic pump 3 are provided on the pressure selection valve 4. An oil port X is provided on the hydraulic pump 3 to cooperate with the oil port B. When the two-position three-way electromagnetic directional control valve 7 is activated, the oil port A and the oil port B are communicated. At the same time, a first spool valve 8, a second spool valve 9 and a displacement oil cylinder 10 are connected in sequence inside the hydraulic pump 3. The pressure difference of the first spool valve 8 is 20 bar.

[0025] At the same time, a pressure reducing valve 11 is also connected inside the pressure selection valve 4, and a throttle valve 12 and a relief valve 13 are connected near the speed limiting port LS1 and the return port T1 inside the hydraulic directional control valve 5.

[0026] Implementation principle: The pump is a variable pump, and the displacement range of the pump is 0 to the selected displacement, that is, the minimum displacement of the pump can reach 0 ml / r. (Select Parker AL A10V 0 45DFR1).

[0027] The pump supplies oil to the hydraulic directional control valve 5 and then to the oil cylinder 6. When the pressure of the oil cylinder 6 increases, the pressure of the LS1 port in the hydraulic directional control valve 5 also increases synchronously. When the two-position three-way electromagnetic directional control valve in the pressure selection valve 4 works, the A and B ports of the pressure selection valve 4 are communicated, and the pressures of the A and B ports are the same. The pressure of the X port of the hydraulic pump 3 is the same as the pressure of the LS1 port of the hydraulic directional control valve, both being the pressure of the LS relief valve, 32 Mpa.

[0028] When the two-position three-way solenoid directional valve in the pressure selection valve 4 is not working and the maximum pressure at port A of the pressure selection valve 4 is 15 Mpa.

[0029] The pressure at port X of the hydraulic pump 3 is the same as the pressure at port LS1 of the hydraulic directional valve. As the pressure selection valve 4 works, the pressure of the oil cylinder 6 slowly increases, and the pressure at port A of the pressure selection valve 4 also increases accordingly. When the pressure at port A of the pressure selection valve 4 is greater than 15 Mpa, the output pressure at port B is constant at 15 Mpa, that is, the pressure at port X of the hydraulic pump 3 is 15 Mpa.

[0030] Since the pressure at port X of the hydraulic pump 3 is 15 Mpa and the pressure difference of the first spool of the hydraulic pump 3 is 20 bar. When the output pressure of the hydraulic pump 3 is greater than 17 Mpa, the first spool of the hydraulic pump 3 slides to the right, and the high-pressure oil of the hydraulic pump 3 flows through the first spool and the second spool to the large chamber of the displacement cylinder, and the displacement of the hydraulic pump 3 decreases rapidly until it stabilizes at a pressure of 17 Mpa.

[0031] When the output pressure of the hydraulic pump 3 is less than 17 Mpa, the first spool moves to the left, and the oil in the large chamber of the displacement cylinder of the hydraulic pump 3 flows back to the fuel tank, and the displacement increases.

[0032] When the oil cylinder 6 moves to the end and the oil circuit does not require flow, the oil supply of the hydraulic pump 3 passes through the directional valve in the hydraulic directional valve 5 and then flows back to the fuel tank through the throttle valve in the hydraulic directional valve 5. At this time, the displacement of the hydraulic pump 3 is equal to the flow rate of the throttle valve in the hydraulic directional valve 5 plus the leakage flow rate of the system; if the oil supply pressure of the hydraulic pump 3 is greater than 17 Mpa, the displacement of the hydraulic pump 3 continues to decrease, the flow rate is less than the flow rate of the throttle valve in the hydraulic directional valve 5, the oil supply pressure decreases, and the pressure is stabilized at 17 Mpa

[0033] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0034] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt the mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0035] The above describes the present utility model and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. In general, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present utility model, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.

Claims

1. A demolition robot pressure selection valve, comprising an oil tank (1), a hydraulic pump (3) and an oil cylinder (6), characterized in that: The oil inlet end of the hydraulic pump (3) is connected to the oil tank (1), a hydraulic reversing valve (5) is provided between the oil outlet end of the hydraulic pump (3) and the oil cylinder (6), and the oil outlet end of the oil cylinder (6) is connected to the hydraulic reversing valve (5). A pressure selection valve (4) is provided between the hydraulic reversing valve (5) and the oil tank (1); a speed limiting port LS1 and an oil return port T1 are provided on the hydraulic reversing valve (5); both the speed limiting port LS1 and the oil return port T1 are connected to the pressure selection valve (4); and the oil return port T1 is also provided with a branch pipe connected to the oil tank (1); The pressure selection valve (4) is also connected to a two-position three-way electromagnetic reversing valve (7). The pressure selection valve (4) is provided with an oil port A connected to the speed limit port LS1 and an oil port B connected to the hydraulic pump (3). The hydraulic pump (3) is provided with an oil port X in coordination with the oil port B. When the two-position three-way electromagnetic reversing valve (7) is started, the oil port A is connected to the oil port B.

2. A demolition robot pressure selection valve according to claim 1, characterized in that: The hydraulic pump (3) is internally connected with a first slide valve (8), a second slide valve (9) and a displacement cylinder (10) which are connected in sequence, and the pressure difference of the first slide valve (8) is 20 bar.

3. The pressure selection valve for a demolition robot according to claim 1, characterized in that: The pressure selection valve (4) is also connected to a pressure reducing valve (11).

4. A demolition robot pressure selection valve according to claim 1, characterized in that: A throttle valve (12) and a relief valve (13) are provided in the hydraulic reversing valve (5) near the speed limiting port LS1 and the oil return port T1.

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