Hydraulic pilot double-control system capable of reducing cost

Abstract

The utility model discloses a hydraulic pilot double-control system capable of reducing cost. The hydraulic pilot double-control system comprises a hydraulic oil tank, a pilot oil source valve, a proportional electromagnetic valve group, a multi-way valve and a walking pilot valve, the input end of the pilot oil source valve is connected with the hydraulic oil tank; the proportional electromagnetic valve group is connected with the output end BV of the pilot oil source valve, the proportional electromagnetic valve group comprises a proportional electromagnetic valve, and the proportional electromagnetic valve comprises a first oil port and a second oil port; the multi-way valve is connected with the first oil port; the input end P of the walking pilot valve is connected with the output end Bv of the pilot oil source valve, the output end T of the walking pilot valve is connected with the hydraulic oil tank, the walking pilot valve comprises an oil outlet, and the oil outlet is connected with the second oil port. According to the utility model, by adjusting the direction of the proportional electromagnetic valve group and the direction of the oil path, a shuttle valve is not required to be used, and the same use purpose can be achieved, so that the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control systems, in particular to a hydraulic pilot dual-control system capable of reducing costs. Background Art

[0002] At present, remote control equipment is increasingly widely used. For example, hydraulic excavators are basically equipped with remote control technology in dangerous working conditions such as disaster relief or high temperature and high dust conditions to protect the life and health of the driver. However, before the equipment enters these special working conditions, in order to improve operating efficiency, the driver is usually asked to enter the cab, move the equipment to the vicinity of the critical special working conditions, and then use remote control technology to operate the equipment. Therefore, these remote control devices basically require two control modes. The following is an introduction to the walking control of a crawler excavator:

[0003] The walking control principle of ordinary crawler excavators is as follows Figure 1 , a pilot gear pump 10 is used as the power source, through the pilot oil source valve 20, and then connected to the travel pilot valve 30, the four oil outlets of the travel pilot valve 30 are respectively connected to the pilot oil ports of the multi-way valve 40, wherein the multi-way valve 40 includes the left crawler travel control valve plate and the right crawler travel control valve plate. In order to ensure that the pressure at the pilot oil port of the multi-way valve 40 is zero when the travel pilot valve 30 is not operated, the four oil outlets of the travel pilot valve 30 are connected to the return oil port T when the travel pilot valve 30 is in normal state (if there is pressure at the pilot oil port of the multi-way valve 40, it is possible to push the internal valve core to move, resulting in the problem of walking action without operating the travel pilot valve). When the travel pilot valve 30 is operated, such as pressing Ⅰ, the pilot oil enters the oil inlet P of the travel pilot valve 30 through the pilot oil source valve 20, and then enters the pilot oil port A1 of the left crawler travel control valve plate through the oil port 301, pushing the valve core to change direction, and realizing the walking action of the left crawler.

[0004] When remote control is added to the excavator operation, a proportional solenoid valve group 50 is usually added to control the multi-way valve 40. The principle is as follows: Figure 2. Taking the walking control principle as an example, the oil outlet of the proportional solenoid valve group 50 is connected to the oil outlet of the walking pilot valve 30 through the shuttle valve 60, and the other oil outlet of the shuttle valve 60 is connected to the pilot oil port of the multi-way valve 40. When the remote control sends a signal, such as energizing the proportional solenoid valve 1, the receiver on the machine body receives the signal, and the control system operates the proportional solenoid valve to change direction. The pilot oil enters the proportional solenoid valve group 50 through the pilot oil source valve 20, passes through the proportional solenoid valve 1, passes through the shuttle valve 60 (the steel ball inside the shuttle valve 60 is pushed to the right), and enters the pilot oil port A1 of the left crawler walking control valve plate, pushing the valve core to change direction. If the walking foot pilot I is operated (no remote control operation at this time), the pilot oil also enters the oil inlet P of the walking pilot valve 30 through the pilot oil source valve 20, and then enters the shuttle valve 60 through the oil port 301 (the steel ball inside the shuttle valve 60 is pushed to the left), and then enters the pilot oil port A1 of the left crawler walking control valve plate, pushing the valve core to change direction, and realizing the walking action of the left crawler. By adding the shuttle valve 60, the dual control of the hydraulic pilot is realized, but the shuttle valve 60 is relatively expensive, and the addition of the remote control system leads to high overall costs. In view of this, the inventor of the utility model conducted in-depth research on the above-mentioned defects in the prior art, and thus this case was created. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the purpose of the utility model is to propose a hydraulic pilot dual control system that can reduce costs, which can achieve the same purpose without using a shuttle valve by adjusting the proportional solenoid valve group and the oil circuit direction, thereby saving costs.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a hydraulic pilot dual control system with reduced cost, including a hydraulic oil tank, a pilot oil source valve, a proportional solenoid valve group, a multi-way valve and a travel pilot valve;

[0007] The input end of the pilot oil source valve is connected to the hydraulic oil tank;

[0008] The proportional solenoid valve group is connected to the output end BV of the pilot oil source valve, the proportional solenoid valve group includes a proportional solenoid valve, and the proportional solenoid valve includes a first oil port and a second oil port;

[0009] The multi-way valve is connected to the first oil port;

[0010] The input end P of the travel pilot valve is connected to the output end Bv of the pilot oil source valve, the output end T of the travel pilot valve is connected to the hydraulic oil tank, and the travel pilot valve includes an oil outlet, which is connected to the second oil port.

[0011] Furthermore, the proportional solenoid valve group includes multiple groups of proportional solenoid valves, and the multiple groups of proportional solenoid valves are all connected to the output end BV of the pilot oil source valve.

[0012] Further, the proportional solenoid valve group includes a first proportional solenoid valve, a second proportional solenoid valve, a third proportional solenoid valve and a fourth proportional solenoid valve; the multi-way valve includes a left crawler walking control valve plate and a right crawler walking control valve plate, the left crawler walking control valve plate includes a first pilot oil port and a second pilot oil port, the first pilot oil port is connected to the first oil port of the first proportional solenoid valve, the second pilot oil port is connected to the first oil port of the second proportional solenoid valve, the right crawler walking control valve plate includes a third pilot oil port and a fourth pilot oil port, the third pilot oil port is connected to the first oil port of the third proportional solenoid valve, and the fourth pilot oil port is connected to the first oil port of the fourth proportional solenoid valve.

[0013] Further, the walking pilot valve includes a left track walking pilot valve and a right track walking pilot valve, the left track walking pilot valve includes a first oil outlet and a second oil outlet, the first oil outlet is connected to the second oil port of the first proportional solenoid valve, the second oil outlet is connected to the second oil port of the second proportional solenoid valve, the right track walking pilot valve includes a third oil outlet and a fourth oil outlet, the third oil outlet is connected to the second oil port of the third proportional solenoid valve, and the fourth oil outlet is connected to the second oil port of the fourth proportional solenoid valve.

[0014] Furthermore, the input end of the pilot oil source valve is connected to the hydraulic oil tank through a pilot gear pump.

[0015] After adopting the above structure, the utility model relates to a hydraulic pilot dual control system with reduced cost, which has at least the following beneficial effects:

[0016] When the excavator is manually controlled to move, the travel pilot valve is operated, and the pilot oil flows from the hydraulic oil tank through the pilot gear pump and the pilot oil source valve to the travel pilot valve, and then flows out from the oil outlet of the travel pilot valve. Since the oil outlet is connected to the second oil port, the pilot oil enters the proportional solenoid valve from the oil outlet through the second oil port, and then flows from the first oil port of the proportional solenoid valve to the pilot oil port of the multi-way valve, thereby controlling the valve plate reversal in the multi-way valve to achieve manual operation. When the excavator is remotely controlled to move, the remote controller sends a signal to energize the proportional solenoid valve, and the receiver on the machine body receives the signal. The control system operates the proportional solenoid valve to reverse, so that the pilot oil enters the proportional solenoid valve group through the pilot oil source valve, passes through the proportional solenoid valve, and flows out from the first oil port. Then the pilot oil flows to the pilot oil port of the multi-way valve, thereby controlling the valve plate reversal in the multi-way valve to achieve remote control operation. It can play the same role as the existing technology, but reduces the use of shuttle valves, and confirms cost savings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a control principle diagram of manual control walking of a common crawler excavator in the prior art;

[0018] Figure 2 This is a control principle diagram of remote control walking of a common crawler excavator in the prior art;

[0019] Figure 3 The control principle diagram of the hydraulic pilot dual control system with reduced cost according to the embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the pilot oil flow when the left crawler of the excavator is manually controlled to move in the positive direction;

[0021] Figure 5 This is a schematic diagram of the pilot oil flow when the left crawler of the excavator is remotely controlled to move in the positive direction.

[0022] Description of symbols

[0023] Hydraulic oil tank 1, pilot oil source valve 2, proportional solenoid valve group 3, first proportional solenoid valve 31, first solenoid valve oil port P1, fifth solenoid valve oil port T1, second proportional solenoid valve 32, second solenoid valve oil port P2, sixth solenoid valve oil port T2, third proportional solenoid valve 33, third solenoid valve oil port P3, seventh solenoid valve oil port T3, fourth proportional solenoid valve 34, fourth solenoid valve oil port P4, eighth solenoid valve oil port T4, multi-way valve 4, left crawler travel control valve plate 41, first pilot oil port a1, second pilot oil port b1, right crawler travel control valve plate 42, third pilot oil port a2, fourth pilot oil port b2, travel pilot valve 5, left crawler travel pilot valve 5a, right crawler travel pilot valve 5b, first oil outlet 51, second oil outlet 52, third oil outlet 53, fourth oil outlet 54, pilot gear pump 6. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] like Figures 3 to 5 As shown, a cost-reducing hydraulic pilot dual-control system of the utility model comprises a hydraulic oil tank 1, a pilot oil source valve 2, a proportional solenoid valve group 3, a multi-way valve 4 and a travel pilot valve 5; the input end of the pilot oil source valve 2 is connected to the hydraulic oil tank 1; the proportional solenoid valve group 3 is connected to the output end Bv of the pilot oil source valve 2, the proportional solenoid valve group 3 comprises a proportional solenoid valve, and the proportional solenoid valve comprises a first oil port and a second oil port; the multi-way valve 4 is connected to the first oil port; the input end P of the travel pilot valve 5 is connected to the output end Bv of the pilot oil source valve 2, the output end T of the travel pilot valve 5 is connected to the hydraulic oil tank 1, and the travel pilot valve 5 comprises an oil outlet, and the oil outlet is connected to the second oil port.

[0026] In this way, the utility model relates to a hydraulic pilot dual control system that can reduce costs. When the excavator is manually controlled to move, the travel pilot valve 5 is operated, and the pilot oil flows from the hydraulic oil tank 1 through the pilot oil source valve 2 to the travel pilot valve 5, and then flows out from the oil outlet of the travel pilot valve 5. Since the oil outlet is connected to the second oil port, the pilot oil enters the proportional solenoid valve from the oil outlet through the second oil port, and then flows from the first oil port of the proportional solenoid valve to the pilot oil port of the multi-way valve 4, thereby controlling the valve plate reversal in the multi-way valve 4 to achieve manual operation. When the excavator is remotely controlled to move, the remote controller sends a signal to energize the proportional solenoid valve, and the receiver on the machine body receives the signal, and the control system operates the proportional solenoid valve to change direction, so that the pilot oil enters the proportional solenoid valve group 3 through the pilot oil source valve 2, passes through the proportional solenoid valve, and flows out from the first oil port, and then the pilot oil flows to the pilot oil port of the multi-way valve 4, thereby controlling the valve plate reversal in the multi-way valve 4 to achieve remote control operation. The invention can play the same role as the prior art, but reduces the use of shuttle valves, thus saving costs.

[0027] The input end of the pilot oil source valve 2 is connected to the hydraulic oil tank 1 through the pilot gear pump 6. By providing the pilot gear pump 6, the pilot oil of the hydraulic oil tank 1 can be effectively pumped out. Optionally, the proportional solenoid valve group 3 includes multiple groups of proportional solenoid valves, and the multiple groups of proportional solenoid valves are connected to the output end Bv of the pilot oil source valve 2.

[0028] Specifically, the proportional solenoid valve group 3 includes a first proportional solenoid valve 31, a second proportional solenoid valve 32, a third proportional solenoid valve 33 and a fourth proportional solenoid valve 34. By setting the first proportional solenoid valve 31 and the second proportional solenoid valve 32, the left crawler can be controlled to move forward or backward. By setting the third proportional solenoid valve 33 and the fourth proportional solenoid valve 34, the right crawler can be controlled to move forward or backward, thereby controlling the excavator to move and turn.

[0029] like Figure 3 As shown, in a preferred embodiment of the utility model, the multi-way valve 4 includes a left crawler walking control valve plate 41 and a right crawler walking control valve plate 42. The left crawler walking control valve plate 41 includes a first pilot oil port a1 and a second pilot oil port b1. The first pilot oil port a1 is connected to the first oil port of the first proportional solenoid valve 31, and the second pilot oil port b1 is connected to the first oil port of the second proportional solenoid valve 32. The right crawler walking control valve plate 42 includes a third pilot oil port a2 and a fourth pilot oil port b2. The third pilot oil port a2 is connected to the first oil port of the third proportional solenoid valve 33, and the fourth pilot oil port b2 is connected to the first oil port of the fourth proportional solenoid valve 34.

[0030] By setting the first pilot oil port a1 and the second pilot oil port b1, when the pilot oil enters the first pilot oil port a1, the left crawler travel control valve plate 41 is pushed to change direction in the positive direction, so that the left crawler moves in the positive direction; when the pilot oil enters the second pilot oil port b1, the left crawler travel control valve plate 41 is pushed to change direction in the reverse direction, so that the left crawler moves in the reverse direction. By setting the third pilot oil port a2 and the fourth pilot oil port b2, when the pilot oil enters the third pilot oil port a2, the right crawler travel control valve plate 42 is pushed to change direction in the positive direction, so that the right crawler moves in the positive direction; when the pilot oil enters the fourth pilot oil port b2, the right crawler travel control valve plate 42 is pushed to change direction in the reverse direction, so that the right crawler moves in the reverse direction.

[0031] In this embodiment, the walking pilot valve 5 includes a left track walking pilot valve 5a and a right track walking pilot valve 5b. The left track walking pilot valve 5a includes a first oil outlet 51 and a second oil outlet 52. The first oil outlet 51 is connected to the second oil port of the first proportional solenoid valve 31, and the second oil outlet 52 is connected to the second oil port of the second proportional solenoid valve 32. The right track walking pilot valve 5b includes a third oil outlet 53 and a fourth oil outlet 54. The third oil outlet 53 is connected to the second oil port of the third proportional solenoid valve 33, and the fourth oil outlet 54 is connected to the second oil port of the fourth proportional solenoid valve 34.

[0032] By setting the left crawler travel pilot valve 5a, when the left crawler travel pilot valve 5a is operated, the pilot oil flows out from the first oil outlet 51 or the second oil outlet 52. Specifically, when the pilot oil flows out from the first oil outlet 51, the pilot oil flows to the second oil port of the first proportional solenoid valve 31, and then flows to the first pilot oil port a1 of the left crawler travel control valve plate 41 through the first oil port of the first proportional solenoid valve 31, so that the left crawler moves in the positive direction; when the pilot oil flows out from the second oil outlet 52, the pilot oil flows to the second oil port of the second proportional solenoid valve 32, and then flows to the second pilot oil port b1 of the left crawler travel control valve plate 41 through the first oil port of the second proportional solenoid valve 32, so that the left crawler moves in the reverse direction.

[0033] By setting the right crawler travel pilot valve 5b, when the right crawler travel pilot valve 5b is operated, the pilot oil flows out from the third oil outlet 53 or the fourth oil outlet 54. Specifically, when the pilot oil flows out from the third oil outlet 53, the pilot oil flows to the second oil port of the third proportional solenoid valve 33, and then flows to the third pilot oil port a2 of the right crawler travel control valve plate 42 through the first oil port of the third proportional solenoid valve 33, so as to realize the positive direction movement of the right crawler; when the pilot oil flows out from the fourth oil outlet 54, the pilot oil flows to the second oil port of the fourth proportional solenoid valve 34, and then flows to the fourth pilot oil port b2 of the right crawler travel control valve plate 42 through the first oil port of the fourth proportional solenoid valve 34, so as to realize the reverse direction movement of the left crawler.

[0034] In order to more intuitively understand the connection relationship between the proportional solenoid valve group 3, the travel pilot valve 5 and the multi-way valve 4, specifically, as Figure 3 As shown, the first oil port includes the first solenoid valve oil port P1, the second solenoid valve oil port P2, the third solenoid valve oil port P3 and the fourth solenoid valve oil port P4, and the second oil port includes the fifth solenoid valve oil port T1, the sixth solenoid valve oil port T2, the seventh solenoid valve oil port T3 and the eighth solenoid valve oil port T4. The first oil port of the first proportional solenoid valve 31 is the first solenoid valve oil port P1, the second oil port of the first proportional solenoid valve 31 is the fifth solenoid valve oil port T1, the first oil port of the second proportional solenoid valve 32 is the second solenoid valve oil port P2, the second oil port of the second proportional solenoid valve 32 is the sixth solenoid valve oil port T2, the first oil port of the third proportional solenoid valve 33 is the third solenoid valve oil port P3, the second oil port of the third proportional solenoid valve 33 is the seventh solenoid valve oil port T3, the first oil port of the fourth proportional solenoid valve 34 is the fourth solenoid valve oil port P4, and the second oil port of the fourth proportional solenoid valve 34 is the eighth solenoid valve oil port T4.

[0035] In this embodiment, taking the pilot oil circuit controlled by the travel pilot valve 5Ⅰ as an example, when the proportional solenoid valve group 3 does not receive the remote control signal and the travel pilot valve 5Ⅰ is not operated, the first pilot oil port a1 of the left crawler travel control valve plate 41 is also connected through the first solenoid valve oil port P1 of the first proportional solenoid valve 31, the fifth solenoid valve oil port T1 of the first proportional solenoid valve 31, and then to the first oil outlet 51 of the left crawler travel pilot valve 5a and the return oil port T of the travel pilot valve 5, so that the pressure of the first pilot oil port a1 of the left crawler travel control valve plate 41 is zero, so that the problem of walking action without operating the travel pilot valve 5 will not occur.

[0036] In this embodiment, driving the left crawler of the excavator to move in the positive direction is taken as an example. Figure 4 As shown, Figure 4 The figure is a schematic diagram of the pilot oil flow when the left crawler of the excavator is manually controlled to move in the positive direction (the bold line represents the flow stroke of the pilot oil). When the left crawler of the excavator is manually controlled to move in the positive direction, the travel pilot valve 5 is operated, and the pilot oil flows from the hydraulic oil tank 1 through the pilot oil source valve 2 to the travel pilot valve 5, and then flows out from the first oil outlet 51 of the left crawler travel pilot valve 5a. The pilot oil enters the first proportional solenoid valve 31 from the first oil outlet 51 through the fifth solenoid valve oil port T1, and then flows from the first solenoid valve oil port P1 of the first proportional solenoid valve 31 to the first pilot oil port a1 of the left crawler travel control valve plate 41, thereby controlling the valve plate reversal in the multi-way valve 4 to realize manual operation.

[0037] like Figure 5 As shown, Figure 5The schematic diagram of pilot oil flow when the left crawler of the excavator is remotely controlled to move in the positive direction (the bold line represents the flow stroke of the pilot oil). When the left crawler of the excavator is remotely controlled to move in the positive direction, the remote controller sends a signal to energize the first proportional solenoid valve 31, and the receiver on the machine body receives the signal. The control system operates the first proportional solenoid valve 31 to change direction, so that the pilot oil enters the first proportional solenoid valve 31 through the pilot oil source valve 2 and flows out from the first solenoid valve oil port P1. Then the pilot oil flows to the first pilot oil port a1 of the left crawler travel control valve plate 41, thereby controlling the valve plate reversal in the multi-way valve 4 to achieve remote control operation. The reverse movement of the left crawler of the excavator and the movement of the right crawler of the excavator are the same as above. Therefore, the utility model can achieve the same purpose of use without using a shuttle valve by adjusting the proportional solenoid valve group 3 and the direction of the oil circuit, thereby saving costs.

[0038] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A hydraulic pilot dual control system that can reduce costs, characterized by: It includes a hydraulic oil tank, a pilot oil source valve, a proportional solenoid valve group, a multi-way valve and a travel pilot valve; The input end of the pilot oil source valve is connected to the hydraulic oil tank; The proportional solenoid valve group is connected to the output end Bv of the pilot oil source valve, the proportional solenoid valve group includes a proportional solenoid valve, and the proportional solenoid valve includes a first oil port and a second oil port; The multi-way valve is connected to the first oil port; The input end P of the travel pilot valve is connected to the output end Bv of the pilot oil source valve, the output end T of the travel pilot valve is connected to the hydraulic oil tank, and the travel pilot valve includes an oil outlet, which is connected to the second oil port.

2. The cost-reducible hydraulic pilot dual control system according to claim 1, characterized in that: The proportional solenoid valve group includes multiple groups of proportional solenoid valves, and the multiple groups of proportional solenoid valves are all connected to the output end Bv of the pilot oil source valve.

3. The cost-reducible hydraulic pilot dual control system according to claim 1, characterized in that: The proportional solenoid valve group includes a first proportional solenoid valve, a second proportional solenoid valve, a third proportional solenoid valve and a fourth proportional solenoid valve; the multi-way valve includes a left crawler walking control valve plate and a right crawler walking control valve plate, the left crawler walking control valve plate includes a first pilot oil port and a second pilot oil port, the first pilot oil port is connected to the first oil port of the first proportional solenoid valve, the second pilot oil port is connected to the first oil port of the second proportional solenoid valve, the right crawler walking control valve plate includes a third pilot oil port and a fourth pilot oil port, the third pilot oil port is connected to the first oil port of the third proportional solenoid valve, and the fourth pilot oil port is connected to the first oil port of the fourth proportional solenoid valve.

4. The cost-reducible hydraulic pilot dual control system according to claim 3, characterized in that: The walking pilot valve includes a left track walking pilot valve and a right track walking pilot valve, the left track walking pilot valve includes a first oil outlet and a second oil outlet, the first oil outlet is connected to the second oil outlet of the first proportional solenoid valve, the second oil outlet is connected to the second oil outlet of the second proportional solenoid valve, the right track walking pilot valve includes a third oil outlet and a fourth oil outlet, the third oil outlet is connected to the second oil port of the third proportional solenoid valve, and the fourth oil outlet is connected to the second oil port of the fourth proportional solenoid valve.

5. The cost-reducible hydraulic pilot dual control system according to claim 1, characterized in that: The input end of the pilot oil source valve is connected to the hydraulic oil tank through a pilot gear pump.

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