CN208587351U - Integrated valve block for hydraulic grab - Google Patents

Abstract

The utility model discloses a kind of integrated valve blocks for hydraulic grab, it includes upper valve body and lower plate, upper valve body surface is provided with two groups of hydraulic fluid ports, every group of hydraulic fluid port includes oil inlet, actuator port and oil return opening, upper valve body is internally provided with two identical asphalt channels, two groups of Hydraulic Elements are installed, two groups of Hydraulic Elements are correspondingly arranged with two asphalt channels and two groups of hydraulic fluid ports respectively in upper valve body；Every group of Hydraulic Elements include check valve, hydraulic control one-way valve and unloading valve；The lower surface of upper valve body is arranged in oil inlet, and the oil inlet filter hole being correspondingly arranged with oil inlet is offered in lower plate, is equipped with filter screen in oil inlet filter hole；Upper valve body is detachably fixed by bolt with lower plate and is connect.The utility model increases filter screen at oil inlet, can prevent hydraulic oil pollution, guarantees the cleannes for entering the hydraulic oil of system from oil inlet, and the overflow valve in system is changed to unloading valve, can control the heating of hydraulic oil.

Description

Integrated valve block for hydraulic grab

Technical field

The utility model relates to field of hydraulic control more particularly to a kind of integrated valve blocks for hydraulic grab.

Background technique

Hydraulic grab is to provide power by hydraulic power supply for hydraulic cylinder, to drive the combination bucket or more of left and right two The folding crawl of a jaw and a kind of equipment for drawing off bulk material.The valve body used on country's hydraulic grab at present is divided to two Kind, no matter a kind of a kind of pump control, valve control pumps control or valve control, is inevitable there are two factor: 1, the cleaning of hydraulic oil Degree；2, the oil temperature of hydraulic oil.

For hydraulic grab in operation because of a variety of factors, hydraulic oil oil liquid can inevitably generate pollution.It is made by hydraulic oil At pollutant be mainly the pollutant that hydraulic oil itself generates and extraneous intrusion pollutant.Hydraulic oil is for a long time in high temperature and pressure Middle use itself can generate carbon distribution and greasy filth because of oxidation, and have the particle of abrasiveness miscellaneous because machine operation generates Matter makes oil gradually pollute and deteriorate along with reasons such as the intrusions of context dust pollution and moisture, and pollutes deterioration Hydraulic oil operates in machinery, and the movement of valve member can be made to have some setbacks, and influences mechanical accuracy, stability, generates undesirable event It more results in blockage to be allowed to shut down when hindering serious and stop production, more wear machinery, piston ring, bearing, oil circuit valve and spare and accessory parts for a long time Deng causing oil leak, reduce the mechanical service life used, to increase the maintenance cost and production cost of wholesale.

Current hydraulic grab generally drives bidirectional hydraulic pump by motor positive and inverse, hydraulic with both direction The hydraulic power supply that oil sources completes hydraulic grab is opened and closed with control grab bucket is replaced, and main element includes two groups of guides Type overflow valve, check valve and hydraulic control one-way valve, wherein the effect of pilot-type relief valve is that system is kept in continuous flooding process Pressure remained constant of uniting is constant, i.e., when system pressure reaches the cracking pressure of pilot-type relief valve, pilot-type relief valve is opened, Extra hydraulic oil returns to mailbox by overflow, but system pressure is constant, and motor is always in on-load acting in fuel feeding work shape State, energy consumption is high when hydraulic grab being caused to work, and Hydraulic System Fever is serious, and hydraulic oil oil temperature is higher.The oil temperature height meeting of hydraulic oil Accelerate the aging of sealing element and the abrasion of pump, causes the pollution of hydraulic oil.

Summary of the invention

The utility model provides a kind of pile-up valve for hydraulic grab to solve shortcoming in the prior art Block increases filter screen at oil inlet, prevents hydraulic oil pollution, guarantees the cleaning for entering the hydraulic oil of system from oil inlet Degree, and the overflow valve in system is changed to unloading valve, can control the heating of hydraulic oil.

The utility model adopted the technical scheme that solve the above-mentioned problems, is provided a kind of for hydraulic grab Integrated valve block, the integrated valve block include upper valve body and lower plate, and upper valve body surface is provided with two groups of hydraulic fluid ports, every group of hydraulic fluid port include into Hydraulic fluid port, actuator port and oil return opening, upper valve body are internally provided with two identical asphalt channels, are equipped with two groups in upper valve body Hydraulic Elements, two groups of Hydraulic Elements are correspondingly arranged with two asphalt channels and two groups of hydraulic fluid ports respectively；

Every group of Hydraulic Elements include check valve, hydraulic control one-way valve and unloading valve, oil inlet respectively with the import of check valve Outlet with the inlet communication of unloading valve, check valve is connected to the working port, and the outlet of hydraulic control one-way valve is connected to the working port, The outlet of the control port of hydraulic control one-way valve and the check valve in another group of Hydraulic Elements, the import of hydraulic control one-way valve and is unloaded The outlet of lotus valve is connected to the return port respectively, the control port of unloading valve and the outlet of check valve；

The lower surface of upper valve body is arranged in oil inlet, and the oil inlet filter hole being correspondingly arranged with oil inlet is offered in lower plate, Filter screen is installed in oil inlet filter hole；Upper valve body is detachably fixed with lower plate and connect.

Preferably, the two sides of the bottom of upper valve body are equipped with connected unit, offer the first threaded hole in connected unit, open up in lower plate There are the second threaded hole corresponding with the first threaded hole, upper valve body and lower plate to pass through the spiral shell across the first threaded hole and the second threaded hole Bolt is fixedly connected.

Preferably, it is provided with intermediate plate between upper valve body and lower plate, offers on intermediate plate and be correspondingly arranged with oil inlet Oil inlet connector, intermediate plate are detachably connected on upper valve body bottom by sunk screw, and it is removable that intermediate plate and lower plate pass through bolt It unloads and is fixedly connected.

Preferably, the filter screen includes circular metal net and stack shell, and circular metal net, which is detachably fixed, is connected to stack shell The outer wall at top, stack shell is equipped with external screw thread, and stack shell is threaded in oil inlet filter hole.

Preferably, the stack shell bottom of filter screen offers well.

Preferably, the diameter of circular metal net is greater than the diameter of oil inlet.

Preferably, the border of oil inlet offers the sealing ring mounting groove of coaxial setting, installation in sealing ring mounting groove There is sealing ring.

Preferably, upper valve body surface is also provided with two groups of survey press oil ports, and two groups of survey press oil ports are correspondingly arranged with two groups of hydraulic fluid ports, Every group of survey press oil port includes that press oil port and work survey press oil port are surveyed in oil inlet, and oil inlet is surveyed press oil port and is connected to oil inlet, and work is surveyed Press oil port is connected to the working port.

By adopting the above technical scheme, the utility model has the advantage that

Filter screen is integrated in valve block by the utility model, is directly filtered before oil inlet to hydraulic oil, is avoided Hydraulic oil not enough cleans bring adverse effect in fuel tank, guarantees the cleannes for entering the hydraulic oil of system from oil inlet, energy The service life for enough improving integrated valve block and hydraulic machinery, reduces failure rate, saves maintenance cost.

The integrated valve block of the utility model can simplify the connection of pipeline, and overall structure is simple and compact, easy to assembly, hydraulic It is easy to assembly rapid when component wear is replaced；It realizes between Hydraulic Elements and is connected without pipe, eliminated because oil pipe, pipe fitting etc. draw Leakage, vibration and the noise risen.

Overflow valve in system is changed to unloading valve by the utility model, when system pressure reaches the cracking pressure of unloading valve When, the hydraulic oil at oil inlet directly passes through unloading valve and oil return opening returns to fuel tank, and system starts idle cycle and carries out off-load, this When the clamping of hydraulic grab material power (hydraulic control one-way valve pressure maintaining effect) is kept by hydraulic control one-way valve, in system Pressure can control the heating of hydraulic oil close to zero.

The filter screen that the utility model uses is is detachably connected, it is convenient to which disassembly is cleaned or replaced, and guarantees oil Road is unobstructed, when installing or removing filter screen, can be sticked into filter screen precession or rotation by using tools such as screwdrivers in well Oil inlet filter hole out, it is convenient and efficient；The sealing ring installed between oil inlet filter hole and oil inlet can be connect in upper valve body with lower plate Afterwards, it can prevent hydraulic oil from revealing from the junction of oil inlet and oil inlet filter hole.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the top view of Fig. 1；

Fig. 3 is the right view of Fig. 1；

Fig. 4 is the bottom view of the intermediate plate in the utility model；

Fig. 5 is the cross-sectional view of the lower plate in the utility model；

Fig. 6 is the bottom view of Fig. 5；

Fig. 7 is the structural schematic diagram of filter screen in the utility model；

Fig. 8 is the cross-sectional view of Fig. 7；

Fig. 9 is the hydraulic principle figure of the utility model.

Specific embodiment

As shown in Figures 1 to 9, the integrated valve block for hydraulic grab of the utility model includes upper valve body 1 and lower plate 2, 1 surface of upper valve body is provided with two groups of hydraulic fluid ports, and every group of hydraulic fluid port includes oil inlet, actuator port and oil return opening, the inside of upper valve body 1 Two identical asphalt channels are provided with, two groups of Hydraulic Elements are installed, two groups of Hydraulic Elements are thread cartridge in upper valve body 1 Valve, two groups of Hydraulic Elements are correspondingly arranged with two asphalt channels and two groups of hydraulic fluid ports respectively；

Every group of Hydraulic Elements include check valve, hydraulic control one-way valve and unloading valve, oil inlet respectively with the import of check valve Outlet with the inlet communication of unloading valve, check valve is connected to the working port, and the outlet of hydraulic control one-way valve is connected to the working port, The outlet of the control port of hydraulic control one-way valve and the check valve in another group of Hydraulic Elements, the import of hydraulic control one-way valve and is unloaded The outlet of lotus valve is connected to the return port respectively, the control port of unloading valve and the outlet of check valve；Unloading valve controls oil circuit Oil return individually take back fuel tank, avoid influence of the unpredictable factor of main oil return to unloading valve in this way, off-load can be improved The precision of valve.

1 surface of upper valve body is also provided with two groups of survey press oil ports, and two groups of survey press oil ports are correspondingly arranged with two groups of hydraulic fluid ports, every group of survey Press oil port includes that press oil port and work survey press oil port are surveyed in oil inlet, and oil inlet is surveyed press oil port and is connected to oil inlet, and press oil port is surveyed in work It is connected to the working port.Press oil port is surveyed in oil inlet and work surveys at press oil port and is connected separately with pressure measuring tie-in, by detecting two groups of surveys The pressure of press oil port can monitor the pressure inside hydraulic system.

Connection directly can be detachably fixed by bolt between upper valve body 1 and lower plate 2, specifically: the bottom of upper valve body 1 Two sides are equipped with connected unit 7, offer the first threaded hole 8 in connected unit 7, and corresponding with the first threaded hole 8 the is offered in lower plate 2 Two threaded holes 9, upper valve body 1 are fixedly connected with lower plate 2 by passing through the bolt of the first threaded hole 8 and the second threaded hole 9.

The upper surface of upper valve body 1 is arranged in actuator port, and the lower surface of upper valve body 1 is arranged in oil inlet, as shown in figure 3, The oil inlet filter hole 3 being correspondingly arranged with oil inlet is offered in lower plate 2, and filter screen 4, oil inlet are installed in oil inlet filter hole 3 Border offer the sealing ring mounting groove of coaxial setting, sealing ring is installed in sealing ring mounting groove.Upper valve body 1 and lower plate After 2 connections, sealing ring can prevent hydraulic oil from revealing from the junction of oil inlet and oil inlet filter hole 3.

As shown in Figure 3 and Figure 4, it can also be connected by intermediate plate 10 between upper valve body 1 and lower plate 2, specifically: upper valve body 1 is whole in rectangular shape, and intermediate plate 10 is arranged between upper valve body 1 and lower plate 2, and intermediate plate 10 claims beyond the position of upper valve body 1 For connected unit 7, the oil inlet connector 11 being correspondingly arranged with oil inlet, the border peace of oil inlet connector 11 are offered on intermediate plate 10 Equipped with sealing ring 6, several counter sinks 12 are also provided on intermediate plate 10, intermediate plate 10 by passing through counter sink 12 from bottom to top Sunk screw be detachably connected on the bottom of upper valve body 1, intermediate plate 10 and lower plate 2 are detachably fixed connection by bolt.It is logical It crosses intermediate plate 10 and connects upper valve body 1 and lower plate 2, individually process upper valve body 1, intermediate plate 10 and lower plate 2, rather than in upper valve Connected unit 7 is processed on body 1, it can effectively save processing cost.

As shown in Figure 7 and Figure 8, the filter screen 4 includes circular metal net 41 and stack shell 42, and circular metal net 41 is not using Rust steel wire, nickel wire or brass wire etc. weave, and the diameter of circular metal net 41 is greater than the diameter of oil inlet, are easily installed filtering It is limited when net 4, prevents filter screen 4 and protrude into inside oil inlet so that the case where can not taking out；41 spiral shell of circular metal net Line is connected to 42 top of stack shell, convenient that individually circular metal net 41 is cleaned or replaced, and prevents circular metal net 41 from blocking, Guarantee that oil circuit is unobstructed, stack shell 42 can continue to use, cost-saved；The outer wall of stack shell 42 is equipped with external screw thread, and 42 screw thread of stack shell connects It connects in oil inlet filter hole 3.42 bottom of stack shell of filter screen 4 offers well 43.It can be by using tool cards such as screwdrivers By 4 precession of filter screen or back-out oil inlet filter hole 3 in into well 43, it is easily installed or dismantles.

As shown in figure 9, by taking wherein one group of Hydraulic Elements and its corresponding one group of hydraulic fluid port as an example, oil inlet P 1 and check valve The outlet of the inlet communication of RV1, check valve RV1 is connected to actuator port A, and actuator port A is connected with the rodless cavity of oil cylinder CL, shape At oil feeding line；The outlet of hydraulic control one-way valve SV1 is connected to actuator port A, and the import of hydraulic control one-way valve SV1 and oil return inlet T connect It is logical, the outlet of the control port of hydraulic control one-way valve SV1 and the check valve RV2 in another group of Hydraulic Elements, when oil inlet P 1 When oil inlet, reverse circulated is can be achieved after being opened by the pressure of hydraulic oil in hydraulic control one-way valve SV2, in the rod chamber for realizing oil cylinder CL Hydraulic oil flows back into oil return inlet T from actuator port B, hydraulic control one-way valve SV2.

The import of unloading valve DV1 is connected to oil inlet P 1, and the outlet of unloading valve DV1 is connected to oil return inlet T, unloading valve DV1 Control port and check valve RV1 outlet, when unloading valve DV1 control oil circuit pressure reach setting pressure when unloaded Lotus, the hydraulic oil at oil inlet P 1 directly pass through unloading valve DV1, oil return inlet T and return filter and return to fuel tank, and system starts sky It carries circulation and carries out off-load, the power of hydraulic grab material clamping at this time is maintained by the closing of each hydraulic fluid port in oil cylinder rodless cavity , the pressure in system can control the heating of hydraulic oil close to zero.

Oil inlet P 1 is surveyed press oil port MP1 with oil inlet and is connected to, and actuator port A surveys press oil port MA with work and is connected to, and can be used for supervising Control internal system pressure.

The connection relationship of another group of Hydraulic Elements and its corresponding one group of hydraulic fluid port is identical as above-mentioned connection relationship.

When hydraulic grab needs to close charging, motor is rotated forward, and hydraulic oil is sucked from oil sucting valve RV4, is added through bidirectional hydraulic pump P After pressure, first passes through and upper valve body 1 is entered by oil inlet P 1 again after the filter screen 4 being arranged in lower plate 2 is filtered, pass through check valve RV1, actuator port A enter the rodless cavity of oil cylinder CL, meanwhile, control oil opens hydraulic control one-way valve SV2, oil cylinder by oil circuit ST2 Hydraulic oil in CL rod chamber returns to fuel tank by actuator port B, hydraulic control one-way valve SV2, oil return inlet T, return filter, hydraulic Grab bucket closure.

In hydraulic grab closing course, when grab bucket encounters the resistances such as material, the pressure of oil inlet P 1 is persistently increased, and works as object When material is grabbed completely or claw reaches extreme limit of travel, it can be increased to the setting pressure of unloading valve DV1, the hydraulic oil of oil inlet P 1 stops at this time Only to actuator port A fuel feeding, but fuel tank is returned to by unloading valve DV1, oil return inlet T and return filter, system starts zero load Circulation carries out off-load, and hydraulic system realizes pressure maintaining, hydraulic grab clamping by hydraulic control one-way valve SV1 and check valve RV1 at this time The power of material is maintained, and the pressure in system can control the heating of hydraulic oil close to zero.

When hydraulic grab needs to open discharging, motor reversal, hydraulic oil is sucked from oil sucting valve RV3, is added through bidirectional hydraulic pump P After pressure, first passes through and upper valve body 1 is entered by oil inlet P 2 again after the filter screen 4 being arranged in lower plate 2 is filtered, pass through check valve RV2, actuator port B enter the rod chamber of oil cylinder CL, meanwhile, hydraulic control one-way valve SV1 is opened, the hydraulic oil in oil cylinder CL rodless cavity Fuel tank is returned to by actuator port A, hydraulic control one-way valve SV1, oil return inlet T, return filter, the claw of hydraulic grab is opened, unloaded Lower material.

The filter screen 4 that the utility model uses, can be by using spiral shell when installing or removing filter screen 4 to be detachably connected The tools such as silk knife stick into 4 precession of filter screen or back-out oil inlet filter hole 3 in well 43；Lower plate 2 and upper valve body 1 are passed through into spiral shell It tethers before connecing, sealing ring 6 is installed between the oil inlet filter hole 3 in lower plate 2 and the oil inlet of upper valve body 1, hydraulic oil can be prevented It is revealed from the junction of oil inlet and oil inlet filter hole 3.

The present embodiment not makes any form of restriction the shape of the utility model, material, structure etc., all foundations The technical essence of the utility model any simple modification, equivalent change and modification to the above embodiments, belong to this reality With the protection scope of new technique scheme.

Claims (8)

1. being used for the integrated valve block of hydraulic grab, it is characterised in that: the integrated valve block includes upper valve body and lower plate, upper valve body surface Two groups of hydraulic fluid ports are provided with, every group of hydraulic fluid port includes oil inlet, actuator port and oil return opening, and upper valve body is internally provided with two phases With asphalt channel, two groups of Hydraulic Elements are installed in upper valve body, two groups of Hydraulic Elements respectively with two asphalt channels and two groups Hydraulic fluid port is correspondingly arranged；

Every group of Hydraulic Elements include check valve, hydraulic control one-way valve and unloading valve, oil inlet respectively with the import of check valve and unload The outlet of the inlet communication of lotus valve, check valve is connected to the working port, and the outlet of hydraulic control one-way valve is connected to the working port, hydraulic control The outlet of the control port of check valve and the check valve in another group of Hydraulic Elements, the import of hydraulic control one-way valve and unloading valve Outlet be connected to the return port respectively, the control port of unloading valve and the outlet of check valve；

The lower surface of upper valve body is arranged in oil inlet, and the oil inlet filter hole being correspondingly arranged with oil inlet, oil inlet are offered in lower plate Filter screen is installed in filter hole；Upper valve body is detachably fixed with lower plate and connect.

2. the integrated valve block according to claim 1 for hydraulic grab, it is characterised in that: the two sides of the bottom of upper valve body are set There is connected unit, the first threaded hole is offered in connected unit, the second threaded hole corresponding with the first threaded hole is offered in lower plate, on Valve body is fixedly connected with lower plate by passing through the bolt of the first threaded hole and the second threaded hole.

3. the integrated valve block according to claim 1 for hydraulic grab, it is characterised in that: set between upper valve body and lower plate It is equipped with intermediate plate, the oil inlet connector being correspondingly arranged with oil inlet is offered on intermediate plate, intermediate plate is removable by sunk screw It unloads and is connected to upper valve body bottom, intermediate plate and lower plate connection is detachably fixed by bolt.

4. the integrated valve block according to any one of claim 1 to 3 for hydraulic grab, it is characterised in that: the mistake Strainer includes circular metal net and stack shell, and circular metal net, which is detachably fixed, to be connected at the top of stack shell, and the outer wall of stack shell is equipped with outer Screw thread, stack shell are threaded in oil inlet filter hole.

5. the integrated valve block according to claim 4 for hydraulic grab, it is characterised in that: open the stack shell bottom of filter screen Equipped with well.

6. the integrated valve block according to claim 4 for hydraulic grab, it is characterised in that: the diameter of circular metal net is big In the diameter of oil inlet.

7. the integrated valve block according to claim 1 for hydraulic grab, it is characterised in that: the border of oil inlet offers The sealing ring mounting groove of coaxial setting is equipped with sealing ring in sealing ring mounting groove.

8. the integrated valve block according to claim 1 for hydraulic grab, it is characterised in that: upper valve body surface is also provided with Two groups of survey press oil ports, two groups of survey press oil ports are correspondingly arranged with two groups of hydraulic fluid ports, every group of survey press oil port include oil inlet survey press oil port and Press oil port is surveyed in work, and oil inlet is surveyed press oil port and is connected to oil inlet, and work is surveyed press oil port and is connected to the working port.