CN222668526U - Priority valve group and engineering machinery for realizing auxiliary device control - Google Patents

Abstract

The utility model discloses a priority valve group for realizing control of an accessory device and engineering machinery, wherein the priority valve group comprises a first priority valve, a one-way valve, a throttle opening 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 an oil pump, the port A forms a first branch through the one-way valve and an integrated control valve for controlling the accessory device, the port B forms a second branch through a multi-way control valve for controlling an excavator, the port A forms a signal branch for feeding back pressure to a spring end and the port B through the throttle opening, the electromagnetic valve controls load/unloading of the signal branch, and the load of the signal branch is used as a feedback signal for controlling the oil pump by the excavator. According to the utility model, in the priority valve group, the oil supply to the multi-way control valve and the integrated control valve is realized through the first branch and the second branch according to the priority valve principle, and the feedback of the original system is related through the signal branch, so that the closed-loop control of the auxiliary device is formed.

Description

Priority valve group for realizing accessory device control and engineering machinery

Technical Field

The utility model relates to the technical field of engineering machinery valve path control, in particular to a priority valve group for realizing accessory device control and engineering machinery.

Background

With the continuous development of engineering machinery technology, the engineering machinery technology is required to have improved versatility and adaptability. The possible attachment is added on the basis of the usual functions, which puts higher demands on the control of the handle of the working machine.

Taking an excavator as an example, the existing hydraulic system of the excavator needs to realize the functions of an accessory device, and generally has two feasible schemes, namely one scheme is expanded on the basis of the original multi-way control valve, and the other scheme is added with an independent control module. The former system can create two difficulties, 1, the volume of the expansion valve increases and is difficult to install, and 2, the cost of the expansion valve increases greatly. In the latter, 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, the control module is added independently, the feedback of the original system cannot be associated, the closed-loop control cannot be formed, the system pressure cannot be built, and the function requirement of controlling the auxiliary device cannot be realized.

Therefore, it is necessary to provide a priority valve group that can be increased independently and that can achieve pressure feedback.

Disclosure of utility model

It is an object of the present utility model to provide a priority valve group that enables accessory device control.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The priority valve group for realizing the control of the auxiliary device comprises a first priority valve, a one-way valve, a throttle orifice and an electromagnetic valve, wherein the first priority valve is provided with a P port, an A port and a B port, the P port is connected with an 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, the A port forms a signal branch for feeding back pressure to a spring end and the B port through the throttle orifice, the electromagnetic valve controls the load/unloading of the signal branch, and the load of the signal branch is used as a feedback signal for controlling the oil pump by the excavator.

Further, the first priority valve is a two-position three-way valve.

Further, the hydraulic control system further comprises a throttle valve, wherein the throttle valve is connected in series between an A port of the first priority valve and the one-way valve.

Further, the hydraulic control system further comprises a first overflow valve, wherein the first overflow valve is connected with the signal branch and controls the maximum pressure of the signal branch.

Another object of the present utility model is to provide a construction machine.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The engineering machine comprises an accessory device, an integrated control valve, a multi-way control valve, a priority valve group and an oil pump, wherein the accessory device is mounted on an engineering machine body and used for realizing accessory functions, the integrated control valve is used for controlling the accessory device, the multi-way control valve is used for controlling the engineering machine body, the priority valve group is used for realizing accessory device control, and the oil pump is used for supplying oil to the integrated control valve or the multi-way control valve through the priority valve group.

The integrated control valve comprises a pressure reducing valve, a hydraulic control valve, a first electric control valve and a second electric control valve, the one-way valve supplies oil to the hydraulic control valve, the first electric control valve and the second electric control valve respectively through the pressure reducing valve, and the hydraulic control valve, the first electric control valve and the second electric control valve respectively control the action of the lifting cylinder, the bucket opening and closing cylinder and the accessory rotary motor.

Further, the integrated control valve further comprises an overflow valve group, wherein overflow valves in the overflow valve group are respectively connected with valve paths of the hydraulic control valve, the first electric control valve and the second electric control valve so as to control the maximum pressures of the lifting oil cylinder, the bucket opening and closing oil cylinder and the accessory rotary motor.

Further, the integrated control valve further comprises a balance valve, and the balance valve is connected in parallel with two ends of the lifting oil cylinder.

Further, 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 electric control valve, and the third priority valve is connected in series between the pressure reducing valve and the second electric control valve.

Further, the oil return of the integrated control valve is connected with the oil return of the multi-way control valve in parallel.

After the technical scheme is adopted, compared with the background technology, the utility model has the following advantages:

1. according to the utility model, in the priority valve group, oil supply to the multi-way control valve and the integrated control valve is realized through a first branch and a second branch according to a priority valve principle, and feedback of an original system is related through a signal branch, so that closed-loop control of an accessory device is formed;

2. the priority valve group is provided with the throttle valve, so that the flow can be adjusted according to the requirement of the accessory device;

3. The utility model sets the second priority valve and the third priority valve in the integrated control valve, thereby realizing the priority flow control of the bucket opening and closing oil cylinder and the accessory rotation motor in the accessory device and realizing the compound control of the accessory device.

Drawings

FIG. 1 is a schematic diagram of an excavator valve path according to the present utility model;

FIG. 2 is a schematic diagram of a priority valve block of the present utility model;

FIG. 3 is a schematic diagram of an integrated control valve according to the present utility model.

Reference numerals illustrate:

100. Priority valve group, 110, first priority valve, 120, one-way valve, 130, throttle, 140, electromagnetic valve, 150, throttle valve, 160, first overflow valve;

210. The lifting oil cylinder, 220, bucket opening and closing oil cylinders, 230, accessory rotation motors;

300. A multi-way control valve;

400. Oil pump 410, oil suction filter core 420, hydraulic oil radiator 430, oil return filter core 440, oil tank 450 and bypass valve;

500. Integrated control valve, 510, pressure reducing valve, 520, hydraulic control valve, 530, first electric control valve, 540, second electric control valve, 551, second overflow valve, 552, third overflow valve, 553, fourth overflow valve, 554, fifth overflow valve, 555, sixth overflow valve, 560, balance valve, 570, second priority valve, 580, third priority valve.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

In the description of the present utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Example 1

Referring to fig. 1 and 2, the present utility model discloses a priority valve set 100 for controlling an accessory device, which includes a first priority valve 110, a check valve 120, a choke 130 and a solenoid valve 140.

The first priority valve 110 is a two-position three-way valve, which has a port P, a port a, and a port B. The port P is connected with the oil supply port of the oil pump 400, and the port a forms a first branch through the check valve 120 and the integrated control valve 500 for controlling the accessory device, so as to supply oil to the integrated control valve 500 and control the accessory device to act. The port B forms a second branch through the multi-way control valve 300 for controlling the excavator so as to supply oil to the multi-way control valve 300, thereby realizing the basic operation of the excavator body. The port a forms a signal branch for feeding back pressure to the spring end and the port B through the throttle 130 to be connected into a control system of the excavator to realize closed-loop control of the auxiliary device, and in the process, the electromagnetic valve 140 is used for controlling load/unloading of the signal branch, and the load of the signal branch is used as a feedback signal of the excavator to control the oil pump 400.

For further understanding of the present embodiment, the working principle of the present embodiment will be described:

When the electromagnetic valve 140 is not electrified, the electromagnetic valve 140 is in a lower position, the oil is conducted, the oil pressure of the oil pump 400 returns to the hydraulic oil tank 440 through the electromagnetic valve 140 after passing through the first priority valve 110 and the throttle 130, at this time, because the return spring force of the first priority valve 110 is small, the first priority valve 110 is in a left position, and almost all the oil pressure input into the P port of the first priority valve 110 is supplied to the multi-way control valve 300 of the original system of the excavator through the B port (i.e. passing through the second branch) of the first priority valve 110, thereby completing the conventional functions of the excavator.

When the solenoid is energized, the solenoid valve 140 is actuated, the solenoid valve 140 is in an upper position, and the oil is closed, at this time, the solenoid valve 140 is closed, a small flow is applied to the inlet of the first relief valve 160 and the spring end of the first priority valve 110 through the orifice 130, and the oil is supplied to the integrated valve of the attachment through the check valve 120 (preventing the backflow of the oil). The redundant oil flows back to the oil tank 440 (i.e. through a signal branch) through the multi-way control valve 300 of the original system of the excavator through the end B, and is fed back to the plunger pump by detecting the negative feedback pressure, so that the corresponding flow of the system is output, namely, the closed-loop control of the accessory device is realized.

In a preferred embodiment, the priority valve group 100 further includes a throttle valve 150, the throttle valve 150 being connected in series between the port a of the first priority valve 110 and the check valve 120, the flow rate of the throttle valve 150 being adjustable according to the demand of the accessory device flow rate.

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

Example 2

Referring to fig. 1 and 3, a second object of the present utility model is to provide a construction machine, which includes a priority valve set 100, an accessory device, a multiple control valve 300 and an oil pump 400.

The attachment is mounted on the construction machine body to realize an attachment function, and includes a lift cylinder 210, a bucket opening/closing cylinder 220, an attachment turning motor 230, and the like, as an example, an excavator. The integrated control valve 500 is used for controlling the actions of the auxiliary devices, the multi-path control valve 300 is used for controlling the excavator body to realize the basic actions of the excavator, the priority valve group 100 is the priority valve group 100 for realizing the control of the auxiliary devices as described in the embodiment 1, the oil pump 400 filters the oil absorption through the oil absorption filter element 410, and then the oil is supplied to the integrated control valve 500 or the multi-path control valve 300 through the priority valve group 100.

Referring to fig. 3, the integrated control valve 500 includes a pressure reducing valve 510, a hydraulic control valve 520, a first electrically controlled valve 530, and a second electrically controlled valve 540. The check 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 control the lifting oil cylinder 210, the bucket opening and closing oil cylinder 220 and the tool turning motor 230 to act respectively.

Specifically, the pilot operated valve 520, the first electrically controlled valve 530, and the second electrically controlled valve 540 are three-position four-way valves, the median functions of the pilot operated valve 520 and the second electrically controlled valve 540 are Y-shaped, the oil pump 400 is not unloaded in the median state to maintain the working states of the devices, and the median function of the first electrically controlled valve 530 is O-shaped. The pilot operated valve 520 respectively controls an a port and a b port of the pilot operated valve 520 through a pilot operated handle, so as to realize reversing of oil and further control lifting of the oil cylinder. The first electric control valve 530 and the second electric control valve 540 adopt electric control modes, control the valve core to realize oil reversing, and respectively control the opening and closing of the bucket opening and closing cylinder 220 and the rotation of the accessory.

The integrated control valve 500 further includes an overflow valve group, where overflow valves in the overflow 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, so as to control the maximum pressures of the lift cylinder 210, the bucket opening and closing cylinder 220, and the attachment rotation motor 230. Specifically, the overflow valve set includes a second overflow valve 551, a third overflow valve 552, a fourth overflow valve 553, a fifth overflow valve 554 and a sixth overflow valve 555, wherein the second overflow valve 551 and the third overflow valve 552 are respectively connected with an a port and a B port of the hydraulic control valve 520, the fourth overflow valve 553 is connected with a B port of the first electric control valve 530, the fifth overflow valve 554 and the sixth overflow valve 555 are respectively connected with an a port and a B port of the second electric control valve 540, so that the maximum pressures of the lifting cylinder 210, the bucket opening and closing cylinder 220 and the tool turning motor 230 can be controlled through the overflow valve set.

To further prevent possible arm drop behavior of lift cylinder 210 when pilot valve 520 is in neutral, integrated control valve 500 further includes a balancing valve 560, balancing valve 560 being integrated at the output of the reversing valve control rodless chamber to help lift cylinder 210 stay in the set position.

In a preferred embodiment, the integrated control valve 500 further includes a second priority valve 570 and a third priority valve 580, the second priority valve 570 being connected in series between the pressure reducing valve 510 and the first electrically controlled valve 530, the third priority valve 580 being connected in series between the pressure reducing valve 510 and the second electrically controlled valve 540. By providing the second priority valve 570 and the third priority valve 580, the flow rates of the supply hopper opening/closing cylinder 220 and the attachment turning motor 230 can be preferentially ensured.

The return oil of the integrated control valve 500 is returned to the oil tank 440 after passing through the hydraulic oil radiator 420 and the return oil filter 430 after being connected in parallel with the return oil of the multiplex control valve 300. A bypass valve 450 is connected in parallel to the hydraulic radiator 420.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. Realize auxiliary device control's priority valves, its characterized in that:

comprises a first priority valve, a one-way valve, a throttle orifice and an electromagnetic valve;

The first priority valve is provided with a P port, an A port and a B port, wherein the P port is connected with an 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 an accessory 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 a spring end and the B port through the throttling port;

The electromagnetic valve controls the load/unloading of the signal branch, and the load of the signal branch is used as a feedback signal for controlling the oil pump by the excavator.

2. The priority valve group for achieving accessory device control of claim 1 wherein the first priority valve is a two-position three-way valve.

3. The priority valve group as recited in claim 1 further comprising a throttle valve connected in series between port A of the first priority valve and the one-way valve.

4. The priority valve group as recited in claim 1 further comprising a first relief valve connected to said signal branch for controlling a maximum pressure of the signal branch.

5. A construction machine, comprising:

an attachment device mounted on the engineering machine body for realizing an attachment function;

an integrated control valve for controlling the accessory device;

the multi-way control valve is used for controlling the engineering machinery body;

A priority valve group, which is a priority valve group for realizing accessory device control as claimed in any one of claims 1 to 4;

and the oil pump supplies oil to the integrated control valve or the multi-path control valve through the priority valve group.

6. The work machine of claim 5, wherein:

the accessory device comprises a lifting oil cylinder, a bucket opening and closing oil cylinder and an accessory rotating motor;

The integrated control valve comprises a pressure reducing valve, a hydraulic control valve, a first electric control valve and a second electric control valve, the one-way valve is used for supplying oil to the hydraulic control valve, the first electric control valve and the second electric control valve respectively through the pressure reducing valve, and the hydraulic control valve, the first electric control valve and the second electric control valve respectively control the lifting oil cylinder, the bucket opening and closing oil cylinder and the accessory rotary motor to act.

7. The construction machine of claim 6, wherein the integrated control valve further comprises an overflow valve group, wherein overflow valves in the overflow valve group are respectively connected with valve paths of the hydraulic control valve, the first electric control valve and the second electric control valve to control maximum pressures of the lifting cylinder, the bucket opening and closing cylinder and the accessory turning motor.

8. The construction machine according to claim 6, wherein the integrated control valve further comprises a balance valve connected in parallel to both ends of the lift cylinder.

9. The construction machine according to claim 6, wherein 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 electric control valve, and the third priority valve is connected in series between the pressure reducing valve and the second electric control valve.

10. The construction machine according to claim 6, wherein the return oil of the integrated control valve is connected in parallel with the return oil of the multiplex control valve.