Priority valve group for realizing accessory device control and engineering machinery

Abstract

The utility model discloses a priority valve group for realizing accessory device control and engineering machinery. The priority valve group comprises a first priority valve, a one-way valve, a throttling port and an electromagnetic valve, the first priority valve is provided with a port P, a port A and a port B, the port P is connected with an oil supply port of the oil pump, the port A forms a first branch through the one-way valve and the integrated control valve used for controlling the accessory device, and the port B forms a second branch through the multi-way control valve used for controlling the excavator; the port A forms a signal branch for feeding back pressure to the spring end and the port B through the throttling port; the electromagnetic valve controls loading / unloading of the signal branch, and the load of the signal branch serves as a feedback signal for the excavator to control the oil pump. In the priority valve group, oil is respectively supplied to the multi-way control valve and the integrated control valve through the first branch and the second branch according to the priority valve principle, and feedback of an original system is associated through the signal branch, so that closed-loop control over an accessory device is formed.

Description

Technical Field

[0001] The utility model relates to the technical field of valve circuit control of engineering machinery, in particular to a priority valve group and engineering machinery for realizing control of auxiliary devices. Background Art

[0002] With the continuous development of engineering machinery technology, it is required to improve its versatility and adaptability. On the basis of common functions, possible auxiliary devices should be added, which puts higher requirements on the control of engineering machinery.

[0003] Taking the excavator as an example, there are usually two feasible solutions for the hydraulic system of the existing excavator to realize the functions of the auxiliary device. One is to expand on the basis of the original multi-way control valve; the other is to add an independent control module. In the former case, the system will form two difficulties: 1. The volume of the expansion valve increases and it is difficult to install; 2. The cost of the expansion valve increases significantly. In the latter case, an independent control module is added, but the control module is uncontrollable because the control of the system is related to the return oil feedback pressure of the original multi-way valve. If a control module is added alone, it cannot be associated with the feedback of the original system, so there is no way to form a closed-loop control, and the system pressure cannot be established, and the functional requirements of controlling the auxiliary device cannot be achieved.

[0004] Therefore, it is necessary to provide a priority valve group that can both increase pressure independently and realize pressure feedback. Utility Model Content

[0005] One of the purposes of the utility model is to provide a priority valve group for realizing the control of auxiliary devices.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A priority valve group for realizing control of an auxiliary device comprises a first priority valve, a one-way valve, a throttle port and a solenoid valve; the first priority valve has a P port, an A port and a B port, the P port of which is connected to the oil supply port of an oil pump, the A port forms a first branch through the one-way valve and an integrated control valve for controlling the auxiliary device, the B port forms a second branch through a multi-way control valve for controlling an excavator, and the A port forms a signal branch for feeding back pressure to its spring end and the B port through the throttle port; the solenoid valve controls the load / unload of the signal branch, and the load of the signal branch serves as a feedback signal for the excavator to control the oil pump.

[0008] Furthermore, the first priority valve is a two-position three-way valve.

[0009] Furthermore, it also includes a throttle valve, which is connected in series between the A port of the first priority valve and the one-way valve.

[0010] Furthermore, it also includes a first overflow valve, which is connected to the signal branch to control the maximum pressure of the signal branch.

[0011] A second purpose of the utility model is to provide an engineering machine.

[0012] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0013] A construction machinery, comprising: an auxiliary device, mounted on a construction machinery body for realizing auxiliary functions; an integrated control valve, used to control the auxiliary device; a multi-way control valve, used to control the construction machinery body; a priority valve group, the priority valve group being the priority valve group for realizing control of the auxiliary device as described above; and an oil pump, supplying oil to the integrated control valve or the multi-way control valve via the priority valve group.

[0014] Furthermore, the auxiliary device includes a lifting cylinder, a bucket opening and closing cylinder and an accessory rotary motor; the integrated control valve includes a pressure reducing valve, a hydraulically controlled valve, a first electrically controlled valve and a second electrically controlled valve, the one-way valve supplies oil to the hydraulically controlled valve, the first electrically controlled valve and the second electrically controlled valve respectively through the pressure reducing valve, and the hydraulically controlled valve, the first electrically controlled valve and the second electrically controlled valve respectively control the actions of the lifting cylinder, the bucket opening and closing cylinder and the accessory rotary motor.

[0015] Furthermore, the integrated control valve also includes a relief valve group, and the relief valves in the relief valve group are respectively connected to the valve paths of the hydraulic control valve, the first electric control valve and the second electric control valve to control the maximum pressure of the lifting cylinder, the bucket opening and closing cylinder and the accessory rotary motor.

[0016] Furthermore, the integrated control valve also includes a balancing valve, and the balancing valve is connected in parallel to both ends of the lifting cylinder.

[0017] Furthermore, the integrated control valve further comprises a second priority valve and a third priority valve, wherein the second priority valve is connected in series between the pressure reducing valve and the first electrically controlled valve, and the third priority valve is connected in series between the pressure reducing valve and the second electrically controlled valve.

[0018] Furthermore, the return oil of the integrated control valve is connected in parallel with the return oil of the multi-way control valve.

[0019] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0020] 1. The utility model realizes oil supply to the multi-way control valve and the integrated control valve respectively through the first branch and the second branch in the priority valve group through the principle of the priority valve, and forms a closed-loop control of the auxiliary device by associating the feedback of the original system through the signal branch;

[0021] 2. The priority valve group of the utility model is provided with a throttle valve, which can adjust the flow rate according to the needs of the auxiliary device;

[0022] 3. The utility model sets a second priority valve and a third priority valve in the integrated control valve to realize the priority flow control of the bucket opening and closing cylinder and the attachment rotary motor in the attachment, thereby realizing the composite control of the attachment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the valve circuit of the excavator of the utility model;

[0024] Figure 2 This is a schematic diagram of the priority valve group of the utility model;

[0025] Figure 3 This is a schematic diagram of the integrated control valve of the utility model.

[0026] Description of reference numerals:

[0027] 100, priority valve group; 110, first priority valve; 120, one-way valve; 130, throttle; 140, solenoid valve; 150, throttle valve; 160, first overflow valve;

[0028] 210, lifting cylinder; 220, bucket opening and closing cylinder; 230, attachment rotary motor;

[0029] 300, multi-way control valve;

[0030] 400, oil pump; 410, oil suction filter element; 420, hydraulic oil radiator; 430, oil return filter element; 440, oil tank; 450, bypass valve;

[0031] 500, integrated control valve; 510, pressure reducing valve; 520, hydraulic control valve; 530, first electrically controlled valve; 540, second electrically controlled valve; 551, second overflow valve; 552, third overflow valve; 553, fourth overflow valve; 554, fifth overflow valve; 555, sixth overflow valve; 560, balancing valve; 570, second priority valve; 580, third priority valve. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Example 1

[0036] Please refer to Figure 1 and Figure 2 As shown, the utility model discloses a priority valve group 100 for realizing control of an auxiliary device, which includes a first priority valve 110 , a one-way valve 120 , a throttle port 130 and a solenoid valve 140 .

[0037] Among them, the first priority valve 110 is a two-position three-way valve, which has a P port, an A port and a B port. Its P port is connected to the oil supply port of the oil pump 400, and its A port forms a first branch through a one-way valve 120 and an integrated control valve 500 for controlling the auxiliary device to supply oil to the integrated control valve 500 to control the action of the auxiliary device. Its B port forms a second branch through a multi-way control valve 300 for controlling the excavator to supply oil to the multi-way control valve 300 to achieve the basic operation of the excavator body. Its A port forms a signal branch for feedback pressure to its spring end and B port through a throttle port 130 to connect to the control system of the excavator itself to achieve closed-loop control of the auxiliary device. In this process, the solenoid valve 140 is used to control the load / unload of the signal branch, and the load of the signal branch is used as a feedback signal for the excavator to control the oil pump 400.

[0038] To further understand this embodiment, the working principle of this embodiment is described:

[0039] When the solenoid valve 140 is not energized, the solenoid valve 140 is in the lower position, the oil is conducted, and the oil pressure of the oil pump 400 passes through the first priority valve 110 and the throttle port 130 and then returns to the hydraulic oil tank 440 through the solenoid valve 140. At this time, because the return spring force of the first priority valve 110 is very small, the first priority valve 110 is in the left position, and the oil pressure input to the P port of the first priority valve 110 is almost all supplied to the multi-way control valve 300 of the original system of the excavator through the B port of the first priority valve 110 (that is, through the second branch), completing the normal functions of the excavator.

[0040] When the electromagnet is energized, the solenoid valve 140 is activated, the solenoid valve 140 is in the upper position, and the oil is closed. At this time, the oil in the solenoid valve 140 is closed, and a very small flow acts on the inlet of the first overflow valve 160 and the spring end of the first priority valve 110 through the throttle port 130, and the oil is supplied to the integrated valve of the auxiliary device through the one-way valve 120 (to prevent the oil from flowing back). The excess oil flows back to the oil tank 440 (that is, through the signal branch) through the B end and the multi-way control valve 300 of the original system of the excavator, and is fed back to the plunger pump by detecting the negative feedback pressure, and the corresponding flow of the output system is output, that is, the closed-loop control of the auxiliary device is realized.

[0041] In a preferred embodiment, the priority valve assembly 100 further includes a throttle valve 150 , which is connected in series between port A of the first priority valve 110 and the one-way valve 120 . The flow of the throttle valve 150 can be adjusted according to the flow demand of the auxiliary device.

[0042] In a preferred embodiment, the priority valve group 100 further includes a first relief valve 160, which is connected to the signal branch so as to relieve pressure when the oil pressure of the signal branch is too high, so as to control the maximum pressure of the signal branch. In a specific example, the pressure of the first relief valve 160 is set to 31.4 MPa, and the relief flow of the first relief valve 160 is set to be relatively small, mainly considering the size of the installation space of the valve block.

[0043] Example 2

[0044] Please refer to Figure 1 and Figure 3 As shown, the second object of the utility model is to provide an engineering machine, which includes a priority valve group 100, an auxiliary device, a multi-way control valve 300 and an oil pump 400.

[0045] The attachments are mounted on the main body of the engineering machinery to realize the attachment functions. Taking the excavator as an example, it includes a lifting cylinder 210, a bucket opening and closing cylinder 220, and an attachment rotary motor 230. The integrated control valve 500 is used to control the action of the attachments; the multi-way control valve 300 is used to control the excavator body to realize the basic action of the excavator; the priority valve group 100 is the priority valve group 100 for realizing the control of the attachments as described in Example 1; the oil pump 400 filters and absorbs the oil through the oil suction filter 410, and then supplies oil to the integrated control valve 500 or the multi-way control valve 300 through the priority valve group 100.

[0046] Please refer to Figure 3 As shown, the integrated control valve 500 includes a pressure reducing valve 510, a hydraulic control valve 520, a first electric control valve 530, and a second electric control valve 540. The one-way valve 120 supplies oil to the hydraulic control valve 520, the first electric control valve 530, and the second electric control valve 540 through the pressure reducing valve 510 (the pressure of the pressure reducing valve 510 is set to 300 bar), and the hydraulic control valve 520, the first electric control valve 530, and the second electric control valve 540 respectively control the actions of the lifting cylinder 210, the bucket opening and closing cylinder 220, and the attachment rotary motor 230.

[0047] Specifically, the hydraulic control valve 520, the first electric control valve 530, and the second electric control valve 540 are all three-position four-way valves. The middle position functions of the hydraulic control valve 520 and the second electric control valve 540 are Y-type. In the middle position state, the oil pump 400 does not unload to maintain the working state of each device; the middle position function of the first electric control valve 530 is O-type. The hydraulic control valve 520 controls the a port and the b port of the hydraulic control valve 520 through the pilot handle to realize the reversal of the oil, thereby controlling the lifting and lowering of the oil cylinder. The first electric control valve 530 and the second electric control valve 540 adopt the electric control mode to control the valve core to realize the reversal of the oil, respectively controlling the opening and closing of the bucket opening and closing cylinder 220 and the rotation of the attachment.

[0048] The integrated control valve 500 further includes a relief valve group, wherein the relief valves in the relief valve group are respectively connected to the valve paths of the hydraulic control valve 520, the first electric control valve 530 and the second electric control valve 540 to control the maximum pressure of the lifting cylinder 210, the bucket opening and closing cylinder 220 and the attachment rotary motor 230. Specifically, the relief valve group includes a second relief valve 551, a third relief valve 552, a fourth relief valve 553, a fifth relief valve 554 and a sixth relief valve 555, wherein the second relief valve 551 and the third relief valve 552 are respectively connected to the A port and the B port of the hydraulic control valve 520, the fourth relief valve 553 is connected to the B port of the first electric control valve 530, and the fifth relief valve 554 and the sixth relief valve 555 are respectively connected to the A port and the B port of the second electric control valve 540. In this way, the maximum pressure of the lifting cylinder 210, the bucket opening and closing cylinder 220 and the attachment rotary motor 230 can be controlled through the relief valve group.

[0049] To further prevent the lifting cylinder 210 from possibly dropping its arm when the hydraulic control valve 520 is in the middle position, the integrated control valve 500 also includes a balancing valve 560, which is integrated in the output port of the rodless chamber controlled by the reversing valve to help the lifting cylinder 210 stay in the set position.

[0050] In a preferred embodiment, the integrated control valve 500 further includes a second priority valve 570 and a third priority valve 580, wherein the second priority valve 570 is connected in series between the pressure reducing valve 510 and the first electric control valve 530, and the third priority valve 580 is connected in series between the pressure reducing valve 510 and the second electric control valve 540. By providing the second priority valve 570 and the third priority valve 580, the flow of the bucket opening and closing cylinder 220 and the attachment rotary motor 230 can be guaranteed in priority.

[0051] After the return oil of the integrated control valve 500 is connected in parallel with the return oil of the multi-way control valve 300, it passes through the hydraulic oil radiator 420 and the return oil filter 430 and returns to the oil tank 440. A bypass valve 450 is connected in parallel to the hydraulic oil radiator 420.

[0052] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A priority valve group for realizing auxiliary device control, characterized by: It includes a first priority valve, a one-way valve, a throttle and a solenoid valve; The first priority valve has a P port, an A port and a B port, wherein the P port is connected to the oil supply port of the oil pump, the A port forms a first branch through the one-way valve and the integrated control valve for controlling the auxiliary device, the B port forms a second branch through the multi-way control valve for controlling the excavator, and the A port forms a signal branch for feeding back pressure to the spring end and the B port through the throttle port; The solenoid valve controls the load / unload of the signal branch, and the load of the signal branch serves as a feedback signal for the excavator to control the oil pump.

2. The priority valve group for realizing control of an auxiliary device according to claim 1, characterized in that: The first priority valve is a two-position three-way valve.

3. The priority valve group for realizing the control of the auxiliary device according to claim 1, characterized in that: It also includes a throttle valve, which is connected in series between the A port of the first priority valve and the one-way valve.

4. The priority valve group for realizing control of an auxiliary device according to claim 1, characterized in that: It also includes a first overflow valve, which is connected to the signal branch to control the maximum pressure of the signal branch.

5. An engineering machine, characterized in that: include: Ancillary devices are mounted on the main body of the engineering machinery to realize auxiliary functions; An integrated control valve for controlling the accessory device; Multi-way control valve, used to control the main body of the engineering machinery; A priority valve group, wherein the priority valve group is a priority valve group for realizing control of an auxiliary device as described in any one of claims 1 to 4; An oil pump supplies oil to the integrated control valve or the multi-way control valve via the priority valve group.

6. The engineering machine according to claim 5, characterized in that: The attachment device includes a lifting cylinder, a bucket opening and closing cylinder and an attachment rotary motor; The integrated control valve includes a pressure reducing valve, a hydraulically controlled valve, a first electrically controlled valve, and a second electrically controlled valve. The one-way valve supplies oil to the hydraulically controlled valve, the first electrically controlled valve, and the second electrically controlled valve respectively through the pressure reducing valve. The hydraulically controlled valve, the first electrically controlled valve, and the second electrically controlled valve respectively control the actions of the lifting cylinder, the bucket opening and closing cylinder, and the accessory rotating motor.

7. The engineering machine according to claim 6, characterized in that: The integrated control valve also includes a relief valve group, and the relief valves in the relief valve group are respectively connected to the valve paths of the hydraulic control valve, the first electric control valve and the second electric control valve to control the maximum pressure of the lifting cylinder, the bucket opening and closing cylinder and the accessory rotary motor.

8. The engineering machine according to claim 6, characterized in that: The integrated control valve further comprises a balancing valve, which is connected in parallel to both ends of the lifting cylinder.

9. The engineering machine according to claim 6, characterized in that: The integrated control valve further includes a second priority valve and a third priority valve, wherein the second priority valve is connected in series between the pressure reducing valve and the first electrically controlled valve, and the third priority valve is connected in series between the pressure reducing valve and the second electrically controlled valve.

10. The engineering machine according to claim 6, characterized in that: The oil return of the integrated control valve is connected in parallel with the oil return of the multi-way control valve.

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